JPH07314195A - Method for checking and correcting position of metal mold of powder molding press - Google Patents

Abstract

PURPOSE:To prevent failure, etc., of the metal molds of a powder molding press and to obtain molded goods having improved safety and stable quality by checking the relative positions of the respective metal molds in a stage before pressurization even if there are errors in metal mold production, input error of data, etc. CONSTITUTION:The press, is set at a metal mold checking position mode. The bottom end face of a holder 203 is placed atop 3a of a die and a measuring element 205 of a dial gage 204 is brought into contact with the top end faces of the first, second, third lower punches 51, 52, 53 of a lower punch unit 5 and a core rod 54. The positions of the top end faces of the respective first, second, third lower punches 51, 52, 53 of the lower punch unit 5 and the core rod 54 from the front surface 3a of the die are measured. The erroneous differences are inputted from a controller if there are the errors from the set values. The first and second lower punches 51, 52 and the core rod 54 are then slightly moved upward and downward and the front end positions are so adjusted that the front end positions are made flush with the top end face of the third lower punch 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for confirming and correcting the relative positional relationship between a plurality of dies such as a die and upper and lower punches in a powder molding press.

[0002]

2. Description of the Related Art The applicant of the present invention has already found that as a method for forming a stepped molded product, the compression speed ratio of a plurality of punches for compressing each stepped portion is always equal to the dimensional ratio of each stepped portion of the molded product during the compression process. Has proposed a molding method in which proportional control is performed so that
-See 94900 gazette).

That is, a highly accurate molded product is obtained by eliminating the movement of powder between powder portions corresponding to each step portion during compression.

Conventionally, the finished product is considerably different from the final product due to the movement of the powder between the powder portions corresponding to the respective step portions. Therefore, the conditions such as the compression ratio of each step portion are changed little by little. It was necessary to make adjustments again, such as performing trial striking, but with the proportional control method described in the above publication, the compression ratio is uniquely determined by the type of powder, and when molded, a product that is as close as possible to a product can be made. became. As described above, according to the proportional control method, a molded product that is as close as possible to a product can be produced without performing a trial shot, so that the trial shot step can be omitted and the productivity is dramatically increased.

[0005]

However, in the case of the above-mentioned prior art, although the trial punching process can be omitted, if a data input error or a mounting error such as a vertical punch is made, a large number of defective products are immediately produced. There is a risk of Also, if the upper and lower punches interfere with each other, it may damage the mold,
In particular, it has become necessary to check the reference length of each punch.

That is, since there is no conventional method for confirming the position of each punch, for example, when the punches having different lengths are mistakenly attached when exchanging the punches, the punch tip position is not in a proper position. If the pressure step is directly performed, a molded product having completely different dimensions will be molded, and in some cases, the upper and lower punches may interfere with each other and be damaged.

Further, even if a punch having a regular size is attached, it is possible that the relative positional relationship between the punches may be lost due to a data input error.

Further, the length of the punch changes due to thermal expansion due to heat generation of the punch during continuous operation. That is, when the forming method by proportional control is adopted, the moving speed is controlled so as to always have a constant ratio while measuring the amount of movement of each punch. It is difficult to measure the position of the tip, and in practice, the punch plate that moves integrally with each punch and the moving portion of the punch drive unit are measured. Therefore, the position from the measurement unit to the punch tip position where the powder is actually pressed is an open loop portion, and the position of the punch tip is not exactly known.

Such a problem is not limited to a stepped molded product, but is a problem that occurs when a molded product without steps is molded.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and its object is to apply pressure even if there is an error in the mold, a data input error or thermal expansion. By confirming the relative positional relationship of each mold in the previous stage, it is possible to improve the processing accuracy of the molded product and to prevent and prevent damage to the mold, etc. To provide.

[0011]

To achieve the above object, the present invention provides a powder molding press for molding a powder molded product by moving a plurality of dies such as a die and an upper and lower punches relative to each other. Prior to, set the mold confirmation position to confirm the relative positional relationship of the mold, measure the relative positional relationship of the plurality of molds at the mold confirmation position, and confirm whether the measured value is the same as the set value. It is characterized in that the relative positional relationship between the molds is corrected so that the measured value becomes the same as the set value.

In such a position confirming / correcting method, the powder molded product is a stepped molded product, and the powder portion corresponding to each step portion is pressed so as to always have the same compression degree during the pressing. It is suitable in all cases.

At the mold confirmation position, the position of another mold is confirmed with reference to any one of the plurality of molds.
It is characterized by correction.

As a reference mold, a die, a lower punch, an upper punch, a core, or the like can be used.

When the lower punch is used as a reference and a plurality of lower punches are provided, one of the plurality of lower punches is used as a reference, and the lower punch is used for the other lower punch. Check and correct the punch position with other dies such as the die and upper punch.

When the upper punch is used as a reference and a plurality of upper punches are provided, one of the plurality of upper punches is used as a reference and the other upper punches are used as a reference. Check and correct the punch position with other dies such as the die and lower punch.

After confirming and correcting the relative positional relationship of the molds,
It is characterized in that the relative positional relationship between the molds is checked and corrected again after a lapse of a specified time or when the specified number of moldings is reached.

The confirmation / correction of the relative positional relationship of the molds is characterized by manually confirming and correcting manually.

The checking and correction of the relative positional relationship of the molds is characterized by automatically checking and correcting.

[0020]

In the present invention, the relative positional relationship of a plurality of molds is measured at the mold confirmation position, and it is confirmed whether the measured value is the same as the preset set value. Then, if there is an error, the relative positional relationship between the molds is corrected so that the measured value becomes the same as the set value.

The positions of a plurality of dies may be confirmed with reference to the side of the press body other than the dies, but if one of the dies is used as a reference, the positions of all the dies can be confirmed. You can check the relative position.

For example, in the case where the lower punch is used as a reference and confirmation is made at a position where the upper punch rises above the lower punch to a specified position, the distance from the die surface to the end surface of the upper punch and the distance to the end surface of the lower punch. Is measured and compared with the set value.

As a reference metal mold, for example, a die is used when the die is fixed to the press body, and a fixed lower punch is used when the die is movable. When all the dies are movable, any one of the dies can be used as a reference and the upper punch can be used as a reference.

In the case where the upper or lower punch is used as a reference and a plurality of upper or lower punches are provided, one of the plurality of upper or lower punches is used as a reference,
Confirm and correct the position of the other upper or lower punch with respect to the standard upper or lower punch, together with other molds.

Even if it is checked / corrected once, the relative positional relationship changes when it expands or contracts due to temperature changes, heat generation during molding and extraction, and temperature changes when the power source is hydraulic pressure. The same check is required when the specified time or the specified number of moldings is reached,
If there is an error, it needs to be corrected.

The relative positional relationship between the molds may be confirmed / corrected manually or automatically.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments.

FIG. 3 shows an example of a tool setting section of a powder molding press to which the die position confirmation and correction method of the powder molding press of the present invention is applied.

In this embodiment, a case where a stepped molded product W as shown in FIG. 2 (f) is molded will be described as an example. The molded product W has an outer first step W1 and an inner third step W1.
Second step connecting the step W3 and the first step W1 with the third step W3
And stepped portions W2, and the upper and lower end surfaces have a stepped shape corresponding to the difference in wall thickness of each portion.

As shown in FIG. 3, the tool set 1 includes
A plurality of molds, that is, a die 3 having a die hole 2 filled with powder, an upper punch unit 4 press-fitted into the upper and lower openings of the die 3, and a lower punch unit 5 are provided. The upper punch unit 4 is connected via a clamper unit 7 to a punch operating unit 6 fixed to an upper ram 9 of the press body.

As shown in detail in FIG. 4, the upper punch unit 4 includes first, second and third upper punches 41, 42 and 43 which are concentrically assembled with each other. The third upper punch 43 is located on the innermost side, and the third upper punch 43 is
The second upper punch 42 is fitted to the outer periphery of the first upper punch 41, and the first upper punch 41 is slidably fitted to the outer periphery of the second upper punch 42. These first, second and third upper punches 41,
42 and 43 are fixed to the first, second and third upper punch holders 44, 45 and 46, respectively.

The third upper punch holder 46 is a solid flanged cylindrical member having a first flange 46a projecting from the upper end thereof, and a hollow cylindrical second upper punch surrounding the outer periphery of the third upper punch holder 46. The holder 45 is fitted, and the hollow cylindrical first upper punch holder 44 is fitted around the outer periphery of the second upper punch holder 45. The first and second upper punch holders 44 and 45 are stepped cylindrical members that expand upward in two steps, and first and second flanges 44a and 44a project from the upper ends thereof. The upper end of the guide shaft 47 that guides the entire upper punch unit 4 is fixed to the third flange 44 a of the first upper punch holder 44. Further, the third upper punch 43 is provided with a through hole 43b into which the core 54 that constitutes the mold is inserted.

In order to prevent rotation between the first, second and third upper punch holders 44, 45, 46, between the first upper punch holder 44 and the second upper punch holder 45 and between the second upper punch holders. Detent pins 48a and 48b are inserted between the holder 45 and the third upper punch holder 46, and the detent pins 48a and 48b guide the vertical movement.

First, second and third upper punch holders 4
At the upper ends of 4, 45, 46, first, second and third insertion portions 81, 82 for connecting to the clamper unit 7,
83 is provided.

The third insertion portion 83 is the third upper punch holder 4
6 is circularly projected from the upper end, and third engaging teeth 86 projecting outward in the radial direction at a predetermined pitch in the circumferential direction are provided on the outer circumference of the upper end.

The second inserting portion 82 is the second upper punch holder 4
A second engaging tooth 85 protruding inward in the radial direction at a predetermined pitch in the circumferential direction is provided on the inner periphery of the upper end of the second inserting portion 82 so as to project upward in an annular shape from the upper end of 5. ing.

The first insertion portion 81 is the first upper punch holder 4
4, a first engaging tooth 84 protruding inward in the radial direction at a predetermined pitch in the circumferential direction is provided on the inner periphery of the upper end of the first insertion portion 81 in an upward annular shape. ing.

Further, the spring 4 is provided between the first upper punch holder 44 and the second upper punch holder 45 and between the second upper punch holder 45 and the third upper punch holder 46, respectively.
9a and 49b are attached to the spring 49
By the spring force of a and 49b, the second upper punch holder 45
By supporting the third upper punch holder 46, the second and third insertion portions 82 and 83 are prevented from falling downward in the free state.

On the other hand, the punch operating unit 6 is constructed by concentrically assembling the first and second upper punch operating means 10 and 11 for operating the first and second upper punches 41 and 42. Third operation of third upper punch 43
The upper punch actuating means is constituted by a pressing mechanism of the press body.

In this case, the press body has a cylinder at the top for operating the entire upper punch unit 4. Due to the combination with the position detection sensor, a fluid pressure cylinder such as pneumatic pressure, hydraulic pressure, hydraulic pressure is preferable to a mechanical press. Also,
Other than the fluid pressure cylinder, a structure driven by a screw drive mechanism may be used.

The second upper punch actuating means 11 is a solid second fixing member 12 arranged at the center, and a cylindrical first fixing member 12 which is slidably fitted to the outer periphery of the second fixing member 12 in a fluid-tight manner. 2 movable members 13 and. An annular second working chamber 14 into which a working fluid such as pressure oil or air flows is provided in a middle portion of the outer periphery of the second fixed member 12, and an inner periphery of the second movable member 13 is provided in the second working chamber 14. Protruding into the second working chamber 14
A second annular piston portion 15 that divides the inside into two chambers is provided. A solid third adapter 18 is fixed to the lower end of the second fixed member 12, and the second movable member 13 is further fixed.
An annular second adapter 17 is fixed to the working end of the lower end.

The first upper punch operating means 10 includes a cylindrical first fixing member 19 fixed to the upper ram 9 of the press body,
The first fixed member 19 includes a cylindrical first movable member 20 which is fitted in a fluid-tight manner so as to be slidable in a fluid-tight manner.
A first working chamber 22 into which a working fluid such as pressure oil or air flows is provided at an intermediate portion of the inner periphery of the first fixed member 19, and the first working chamber 22 projects on the outer circumference of the first movable member 20. First
First annular piston portion 21 that divides the working chamber 22 into two chambers
Is provided. An annular first adapter 16 is fixed to the lower end of the first movable member 20.

The first and second upper punch operating means 10, 1
The upper ends of the first fixing member 19 and the second fixing member 12 are connected via a fixing plate 23. That is, the second
The upper end of the fixing member 12 is directly fixed to the fixing plate 23,
The first fixing member 19 is fixed to the fixing plate 23 via a fixing rod 24. The fixed rod 24 is the first and second
The movable members 20 and 13 extend along the moving direction and are slidably inserted into the first and second movable plates 25 and 26 connected to the upper ends of the first and second movable members 20 and 13. There is.

As shown in FIG. 5, the clamper unit 7 is composed of first, second and third clampers 71, 72 and 73 which are assembled concentrically with each other. Third
The clamper 73 is a solid columnar member, and a cylindrical second clamper 72 is fitted on the outer periphery of the clamper 73 so as to be movable in the axial direction. Further, a cylindrical first clamper 71 is fitted on the outer periphery of the second clamper 72 so as to be movable in the axial direction.

The upper end of the third clamper 73 has a third adapter 8 at the lower end of the second fixing member 12 of the punch operating unit 6.
Is rotatably connected to.

The upper end of the second clamper 72 is rotatably connected to the second adapter 17 at the lower end of the second movable member 13 of the punch operating unit 6.

Further, the upper end of the first clamper 71 is rotatably connected to the first adapter 16 at the lower end of the first movable member 20 of the punch operating unit 6.

On the other hand, at the lower end of the third clamper 73, there is provided a concave third receiving portion 93 with which the third inserting portion 83 at the upper end of the third upper punch holder 46 is engaged. This third
On the inner circumference of the lower end of the receiving portion 93, a plurality of third receiving teeth 96 are formed to project in the circumferential direction at a predetermined pitch.

At the lower end of the second clamper 72, there is formed a second receiving portion 92 with which the second inserting portion 82 at the upper end of the second upper punch holder 45 is engaged. This second receiving portion 9
2 A plurality of second receiving teeth 95 are formed on the outer periphery of the lower end at a predetermined pitch in the circumferential direction.

Further, at the lower end of the first clamper 71, a first receiving portion 91 with which the first inserting portion 81 at the upper end of the first upper punch holder 44 is engaged is provided, and the first receiving portion 91 is provided.
On the outer periphery of the lower end of the
The receiving tooth 94 is formed.

These first, second and third clampers 71, 7
Keys 97 and 98 mounted between the first clamper 71 and the second clamper 72 and between the second clamper 72 and the third clamper 73 prevent rotation of the members 2, 73, and they are fixed in the rotational direction. It is rotatably movable in the axial direction. By the rotation preventing members such as the keys 97 and 98, the phases of the first, second and third receiving teeth 94, 95 and 96 of the first, second and third clampers 71, 72 and 73 are kept in a constant relationship. I am supposed to keep it.

On the other hand, a rotation operating portion 30 is provided as a rotating means for rotating the clamper unit 7.

As shown in FIG. 5B, the rotary operating portion 30 has driven teeth 31 formed on the outer periphery of the first clamper 71,
The rack 32 that meshes with the driven tooth 31 and the rack 3
The first fixing member 19 of the punch operating unit 6 is composed of a reciprocating cylinder 33 for driving the punching unit 2 back and forth.
Is attached to.

The upper punch unit 4 described above is assembled to the tool set 1 to which the corresponding lower punch unit 5 is attached.

The tool set 1 includes a die plate 34 having a die 3 filled with powder, and the die plate 34.
Lower punch plate 35 disposed below the first lower punch plate 35 to hold the first lower punch 51, a second lower punch plate 36 disposed below the first lower punch plate 35 to support the second lower punch 52, and a press body. The fixing plate 38 fixed to the frame 37 and the pull-down plate 39 arranged below the fixing plate 38 and connected to the die plate 34 via the tie rod 61. A tie rod 61 is slidably inserted into the first lower punch plate 35 and the second lower punch plate 36.

Then, the first lower punch plate 35 and the second lower punch plate 35
A first lower punch driving cylinder 62 for operating the first lower punch 51 is mounted between the lower punch plates 36, and a second lower punch 52 is provided between the second lower punch plate 36 and the fixed plate 38. A second lower punch drive cylinder 63 for operation is attached. Further, a core rod drive cylinder 67 for reciprocally driving the core rod 54 is mounted on the lower surface side of the fixed plate 38. Further, the pull-down plate is also driven by a fluid pressure cylinder (not shown) such as hydraulic pressure or pneumatic pressure.

First lower punch drive cylinder 62 and second
The lower punch drive cylinder 63 has annular first and second piston rods 64 and 65, and the third lower punch 53 has the inner periphery of the second piston rod 65 of the second lower punch drive cylinder 63. The third lower punch holder 57 is inserted, and the second lower punch holder 56 is inserted into the inner circumference of the first piston rod 64 of the first lower punch drive cylinder 62. Further, the core rod drive cylinder 67 has a piston 67a to which a core rod holder 55 that supports the core rod 54 is connected.

In the upper punch unit 4, the upper end of a guide shaft 47 which is inserted through the die plate 34 is fixed, and the upper punch unit 4 is supported by the die plate 34 via the guide shaft 47.

Further, the die plate 34 is provided with an elevating cylinder 66 as an advancing / retreating means for elevating the upper punch unit 4 and advancing / retreating with respect to the clamper unit 7.

To connect the upper punch unit of the above-mentioned powder molding press, the tool set 1 is mounted in the press body (not shown), the elevating cylinder 66 is operated to raise the upper punch unit 4, and the upper punch unit 4 is moved upward. First of punch unit 4
The first, second and third insertion portions 81, 82 and 83 at the upper ends of the second and third upper punches 41, 42 and 43 are connected to the lower ends of the first, second and third clampers 71, 72 and 73 of the clamper unit 7. 1st, 2nd, 3rd receiving parts 91, 92, 93.

Next, the drive rack 32 is moved straight forward by a predetermined amount by the cylinder 33 of the rotary operation unit 30, and the clamper unit 7 is rotated via the driven teeth 31 meshing with the drive rack 32, so that each of the first and second clamper units 7 is rotated. The first, second and third receiving teeth 94, 95 and 96 are meshed with the first, second and third engaging teeth 84, 85 and 86 of the upper punch unit 4. In the case of the illustrated example, since the first, second, and third engaging teeth 84, 85, and 86 are nine, they are meshed when rotated by 20 degrees.

Next, the molding process will be briefly described with reference to FIG.

The molding process is roughly divided into a mold position confirming process for confirming and correcting the relative positional relationship between the molds (see FIG. 1), and a process for filling the die hole 2 with the powder P after confirming the mold position (see FIG. 1). 2 (a)), a step of transferring the filled powder P (see FIG. 2 (b)), a proportional pressurizing step (see FIG. 2 (c)), and a step of extracting the molded product 1 after depressurization. (See FIG. 2D).

In the mold position confirming process, in this embodiment, the lower third punch 53 fixed to the press body is used as a reference,
Check and correct the positional relationship of other molds. In the case of the present embodiment, as the die confirmation position, with reference to the lower third punch 53, the die 3, which is another die, the lower second and lower first punches 52 and 51, the core rod 54, and the upper die. The positions of the first, second, and third punches 41, 42, 43 are set so as to have a fixed dimensional relationship.

At the die confirming position, the lower first to third punches 51, 52, 53, the core 54, the die 3 and the upper first to third punches.
When the third punches 41, 42, 43 are in the normal positional relationship, the lower first and second punches 51, 52, the end surface of the core rod 4, and the die 3 are provided on the upper end surface of the lower third punch 53 serving as a reference. Of the upper first to third punches 41 to 43 are located at the predetermined height H from the upper end surface of the lower third punch 53.

The mold confirmation position may be selected at a certain position in the molding cycle, for example, a position at which the molded product is completely extracted, and it may be confirmed whether or not there is a normal positional relationship at that time. It is preferable to provide the mold position confirmation position separately from the molding stroke instead of a certain position in the stroke.

That is, since the molding stroke differs depending on the shape and size of the molded product, it is necessary to change the setting position of the mold confirmation position each time a molded product having a different shape and size is punched, which makes the work troublesome. . That is, as shown in FIG. 2G, the lifted position A of the upper first to third punches 51, 52, 53 corresponding to the extraction completion position during the molding cycle.
Is calculated by A = A1 (height of the feeder Fe sliding on the upper surface of the die 3) + A2 (filling depth from the upper surface of the die 3 to the end surface of the lower third punch 53) + α (predetermined dimension). The filling depth A2 changes depending on the size of the molded product.

Therefore, in order to enable confirmation at a common mold confirmation position even if the shape, size, etc. of the molded product are changed,
A position having a certain dimensional relationship is set as a mold confirmation position. That is, when exchanging the upper and lower punches, etc. in order to hit different molded products, the reference length of the upper and lower punches, etc. is not changed, so by setting the predetermined mold confirmation position separately from the molding stroke, the same With this tool set, it is possible to use a common mold confirmation position regardless of the shape and size of the molded product.

The reference length is a part to be replaced, and the reference length A of the first lower punch 51 is the same as that of the first lower punch 51.
All the lower punch holders 58, the reference length B of the second lower punch 52 is up to the middle of the second lower punch 52 and the second lower punch holder 56, and the reference length C of the third lower punch 53 is the third lower punch 53. And the reference length D of the core rod 54 is only the core rod 54 up to the middle of the third lower punch holder 57.

The reference lengths A, B, C and D are constant regardless of the molded product. A, B, C, D for the same press
If the same length is used, they can be used in common. Each punch is made according to this reference length, but if an error occurs, it will be corrected at the mold confirmation position.

Further, the reference length E of the first upper punch 41 is up to the middle of the first upper punch 41 and the first upper punch holder 44, and the reference length F of the second upper punch 42 is the second upper punch 42.
And the third upper punch 43 up to the middle of the second upper punch holder.
The reference length G of is only the third upper punch 43, and like the lower punch, each punch is made according to the reference length.
If there is an error, it will be corrected at the mold confirmation position.

The reference lengths in the illustrated example are the total lengths of the upper and lower punches and the punch holder, but this is uneconomical, but all of them including the punch holder may be made of the material for the die. .

In this mold checking position, in the normal state, the lower end surfaces of the first, second and third upper punches 41, 42, 43 are flush with each other, and the first, second, third Lower punch 51,
The upper end surfaces of 52, 53 and the core rod 54 are flush with the upper surface of the die 3. The distance H from the upper end surface of the third lower punch 53 to the first to third upper punches 41 to 43 is set to 100 [mm], for example. Of course, the distance H
Can be selected from any dimension that is easy to measure.

The first to third upper punches 41 to 43 do not have to be flush, and the first to third lower punches 51 to 53,
The die 3 and the core rod 54 do not have to be flush.

Further, each of the first to third lower punches 5 to be confirmed
1 to 53, the end surfaces of the first to third upper punches 41 to 43 have rounded edges 42b and 52b at the edge portions as shown in FIG. 2 (h).
Since the projections 51b, 41b, 43b, 53b are provided, the flat surface portions 41a to 43a, avoiding the edge portion,
Confirmation work is performed at 51a to 53a.

At the die confirmation position, the movable members 20 and 13 of the first and second upper punch actuating means 10 and 11 have a margin so that they can be moved up and down for position adjustment. There is. Further, the first and second lower punch operating means 62, 6
The 3 and the core drive cylinder 67 also have a margin so that they can be moved up and down.

For the confirmation work, as shown in FIG. 1, a confirmation jig using a dial gauge is used.

That is, the confirmation jig 200 is composed of the upper and lower end surfaces 2
It is composed of a block-shaped retainer 203 formed so that 01 and 202 are parallel to each other, and a dial gauge 204 attached to an intermediate portion of the retainer 203 in the vertical direction. The height H of the retainer 203 is set equal to the regular height dimension between the upper surface 3a of the die 3 and the lower end surface of the upper punch unit 4 at the die confirmation position, and is the reference point of the probe 205 of the dial gauge 204. Is the holder 203
On the extension surface of the lower end surface 202 of the die, that is, the upper surface 3a of the die 3.
It is adjusted so that it is located at.

The dial gauge 204 has a well-known structure and has a gauge body 206 with a scale and a gauge body 206.
And a gauge head 20 which is provided so as to be retractable from the gauge main body 20.
It is a configuration in which the pointer of 6 swings. In the illustrated example, the gauge body 206 is attached to the holder 203 via the arm 207.

Then, the press is set in the mold confirmation position mode, the lower end surface of the retainer 203 is placed on the die upper surface 3a, and the tracing stylus 205 of the dial gauge 204 is placed in the first, second, and third punch units 5. 3 The lower punches 51, 52, 53 are brought into contact with the upper end faces of the core rods 54, and the positions of the upper end faces of the first, second, third lower punches 51, 52, 53 and core rods 54 from the die upper surface 3a are measured. To do.

If there is an error with the set value, the error is input from the controller, the first and second lower punches 51 and 52 and the core rod 54 are slightly moved up and down, and the tip position is set to the third lower punch. Adjust so that it is flush with the upper end surface of 53.

Then, the cage 203 is turned upside down and the upper end surface 202 is placed on the die upper surface 3a.
Check the position of the lower end surface of each of the first, second, and third upper punches 41, 42, 43, and if there is an error, the first and second upper punch drive cylinders 10, 11 Drive the first and second upper punches 41 and 42 to drive the first and second upper punches.
The lower end surfaces of the upper punches 41 and 42 are adjusted so as to be flush with the lower end surface of the third upper punch 43 that moves together with the upper ram 9.

If such a confirmation jig 200 is used, it is advantageous that the end faces of the upper and lower punches 41 to 43 and 51 to 53 can be measured as they are if the confirmation jig 200 is oriented in the opposite direction. Is. Each upper punch 4 at this confirmation position
The height of 1 to 43 is approximately 100 [m for easy measurement.
m] is preferable.

After this confirmation work, full-scale pressure molding is started. By the confirmation / correction work, the end face positions of the upper and lower punch units 4 and 5 become completely the same, and if the specified filling depth and pressurizing position are input, the forming can be performed without any trouble.

Then, each of the first to third upper and lower punches 41 to 4
3, 51-53, core rod 54, position detectors 411-431, 511, 521 that monitor the operation of the die 3.
The position detectors 411 to 541, 301 are different from the tip positions of the punches and core rods and the upper surface 3 of the die.
431 to the tips of the upper punches 41 to 43, the position detectors 511, 521 and 541 to the tips of the lower punches 51 and 52 and the tip of the core rod 54, and the position detector 301.
The components such as the punch and the adapter from the die to the die upper surface 3 form an open loop.

That is, for the first upper punch 41,
The first movable member 20, the first adapter 16, the first clamper 71, the first punch holder 44, and the first upper punch 41 of the first punch working cylinder serve as an open portion.

Regarding the second upper punch 42, the second movable member 13 of the second punch working cylinder 13, the second adapter 17,
The second clamper 72, the first punch holder 45, and the second upper punch 42 are open parts.

Regarding the third upper punch 43, the second fixing member 12 of the second upper punch operating cylinder and the third adapter 1
8, the third clamper 73, the third upper punch holder 46, and the third upper punch 43 are open portions.

As for the first lower punch 51, the first lower punch 51 and the first lower punch holder 58 are open portions.

As for the second lower punch 52, the second lower punch 52 and the second lower punch holder 57 are open portions.

For the core rod 54, the core rod 5
4 and the core rod holder 55 become an open part.

For the die 3, the tie rod 61
Is the open part.

If the length of the open portion changes when the temperature is changed, the heat is generated at the time of molding and extraction, or the temperature is changed when the power source is hydraulic pressure, the length of the open portion is changed. Similar checks are needed when the number is reached. If an error occurs, it needs to be corrected.

After the confirmation and correction of the mold are completed, the original molding process is started.

First, the die hole 2 is filled with a predetermined amount of powder, and the filled powder is transferred. The filling depth is the first, second, and third step portions W1, W2, W3 of the final molded product W.
It is set to the same ratio as the size ratio of.

In the transfer step, as shown in FIG. 2 (a), the first step W1 and the second step W of the filled powder P are
2 Corresponding powder portions P1 and P2 are sandwiched by the first and second upper and lower punches 41, 51; 42, 52 and moved relative to each other without changing the filling depth. First and second upper and lower punch 4
1, 51; 42, 52 move at a speed according to the amount of movement, and are controlled so as to start at the same time and end at the same time without pressing the powder.

Then, in the pressing step, each of the first to third upper punch position detectors 411 to 431, the first to third lower punch position detectors 511 to 531 and the core rod position detector 54.
Based on the signal from 1, the first and second upper punch operating cylinders 10 and 11 and the first and second lower punch operating cylinders 6
2, 63, and the core rod actuating cylinder 67 are controlled so that the first upper and lower punches 41 and 51; the second upper and lower punches 4
2, 52; the corresponding powder portions are simultaneously compressed in the axial direction by the third upper and lower punches 43, 53. At this time, the powder parts are compressed so that the densities of the powder parts are always the same during the compression (see FIG. 1D).

That is, the upper first, second, and third upper punches 4
When the speeds of 1, 42, 43 are v01, v02, v03 and the lower first, second and third punches 51, 52, 53 are v11, v12, v13, (v01-v11), (v02-v12) ， (V03 ー v13)
Is controlled to be the same as the dimensional ratio of each of the first, second, and third step portions W1, W2, W3 of the final molded product W during molding.

The above position detectors 411-431, 511-
Reference numerals 531 and 541 are configured by a combination of a linear scale attached to the movable portion and a sensor attached to the fixed portion on the press body side. In this embodiment, the linear scale of the first upper punch position detector is used. Scale 411a
On the fixed plate 23, the second upper punch position detector 421
Of the linear scale 421a of the first movable plate 25,
Linear scale 431 of third upper punch position detector 431
a is fixed to the second movable plate 26, and sensors 411b, 421b, 431b for reading the scales of the linear scale are provided on the press main body side in proximity to the linear scales 411a, 421a, 431a. The arrangement relationship shown in FIG. 3 is conceptual, and is actually arranged in the circumferential direction of the tool set so as not to interfere with each other.

The linear scale 511a of the first lower punch position detector 511 is arranged on the first punch plate 55, and the linear scale 521a of the second lower punch position detector 521 is arranged.
On the second punch plate 56, the core rod position detector 5
The linear scale 541a of 41 is a core rod holder 55.
On the lower end surface of the die scale 301 of the linear scale 3
01a is a mounting portion 5 provided on the lower ram 39a.
It is attached to 41c and 301c.

In the present embodiment, the third lower punch 53 is fixed and the third upper punch 43 is driven by the upper ram 9 of the press. The moving speeds of the third upper and lower punches 41, 51; 42, 52 and the upper third punch 43 are set, and the first and second upper punch operating cylinders 10, 11 and the upper ram 9 are set to have the set moving speeds. The operating cylinders and the first and second lower punch operating cylinders 62, 63 are controlled.

As the pressurizing method, various pressurizing methods such as a single pressing method and a double pressing withdrawal method can be adopted.

When the pressing is completed, the die 3 and the lower first
The second punches 51 and 52 are lowered and the upper punch unit 4 is raised to pull out the molded product (see FIG. 2D).

When the extraction of the molded product W is completed, the molded product W is conveyed by sliding on the die upper surface 3a. This transportation is
The powder P for the next molding step is pushed laterally by the advancing feeder F, and at the same time, the powder P for the next molding is filled in the die hole 2 and the process moves to the next molding step.

Further, these die operating methods should be widely applied to presses of numerical control system such as full-hydraulic servo system, hydraulic proportional control system, screw servo motor system, or system in which ordinary mechanical press is controlled by servo motor. You can The mechanical press has a boosting mechanism such as a crank, cam, and toggle. For precise control, it is effective to use a non-slip mechanism such as a toothed belt, chain, or gear transmission mechanism in the power transmission section. Is.

In the above embodiment, the upper punch unit 4 is connected to the punch operating unit 6 via the clamper unit, but as shown in FIG. It goes without saying that the punch operating unit 6 may be connected. In the figure, the same components as those of the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted.

FIG. 7 shows a second embodiment of the present invention.

This example shows the case where the die 211 is stepped by the with-dual method in which the die is lowered to pressurize and extract the product. In this embodiment, the molded product WA is a stepped molded product. There is one lower punch 212, and the second step portion W is provided between the lower punch 212 and the upper punch 213.
A2 is compressed, and step 211a of die 211 and upper punch 2
The first step WA1 is compressed between the first step WA1 and the second step WA1.

During compression, the first and second step portions W are always
Upper punch 213, die 211 and lower punch 212 so that the powder portions corresponding to A1 and WA2 always have the same degree of compression.
The speed of is set. That is, when the dimensional ratio of the first and second step portions WA1 and WA2 of the molded product WA is 1: 2, the speed of the upper punch 213 is VA, the speed of the die 211 is VB, and the speed of the lower punch 212 is Vc. Then, VA: VB: Vc is 2:
By setting to 1: 0, the first and second step portions WA1 and W
The powder portion corresponding to A2 can always be pressed with the same degree of compression, and an extremely precise molded product WA can be obtained.

The relative positional relationship between the lower punch 212 and the upper punch 213 before pressurization is important in order to obtain a precise dimension, and the upper and lower punches 212, 213 are formed at an appropriate stage of the molding process.
It is necessary to confirm the relative positional relationship between the die 211 and the die 211.

Also in this example, at the die confirmation position, the same figure (e)
As shown in, the upper end surface of the lower punch 212 is flush with the upper surface of the die 211.

Further, the lower end surface of the upper punch 213 is set at a position separated from the reference surface of the lower punch 212, that is, the upper surface of the die 211 by a predetermined distance, and the dial gauge 204 similar to that of the first embodiment is used. The confirmation work can be performed in exactly the same manner using the confirmation jig 200 that has been used.

FIG. 8 shows a third embodiment of the present invention.

This example is also for molding a stepped molded product similar to that shown in FIG. 7. In this example, in the case of a double pressure system with a fixed die, one upper punch 301 and two lower punches 3 are used.
This is an example of press molding with 02, 303.

In this case, the punches 301, 302,
The speed of 303 is VA for the upper punch 301 and 3 for the first lower punch.
02 is VB and the second lower punch 303 is Vc, VA:
By setting VB: Vc to 1: 0: 1,
The powder portions corresponding to the second step portions WA1 and WA2 can always be pressed with the same degree of compression, and an extremely precise molded product can be obtained.

The relative positional relationship between the upper punch 301, the first and second lower punches 302 and 303, and the die 304 before pressurization is important in order to obtain a precise dimension. As shown in FIG. 7E, the upper end surfaces of the first and second lower punches 302 and 303 are flush with the upper surface of the die 304.

Further, the lower end surface of the upper punch 301 is set at a position separated from the reference surface of the lower punches 302 and 303, that is, the upper surface of the die 304 by a predetermined distance, and the dial gauge 204 similar to that of the first embodiment is used. Confirmation jig 20 using
The confirmation work can be performed in exactly the same manner by using 0.

FIG. 9 shows a fourth embodiment of the present invention.

Also in this embodiment, the die is lowered to press the product,
Upper punch 401 with withdrawal method
In the case where the number of lower punches 402, 403, and 404 is three, a stepped molded product having a flat upper surface and three lower surfaces is formed. Then, the first, second, and third step portions WB1, W
When the ratio of the thickness dimensions of B2 and WB3 is 1: 2: 3, the speed of the upper punch 401 is VA, the first and second lower punches 402,
If the speed of 403 is VB, Vc, and if VA: VB: Vc is set to 3: 2: 1, the first, second, and third step portions WB1,
The powder portions corresponding to WB2 and WB3 can be pressed so as to always have a uniform degree of compression during the pressing, and a molded product WB with precise dimensions can be obtained.

In order to obtain precise dimensions, the upper punch 401 before pressing, the first, second and third lower punches 402, 403,
The relative positional relationship between the 404 and the die 405 is important, and in this example as well, at the die confirmation position, as shown in FIG. The end surface is flush with the upper surface of the die 405.

Further, the lower end surface of the upper punch 401 is connected to the reference surface of the lower punches 402, 403 and 404, that is, the die 40.
5 It is set at a specified distance from the top surface,
The confirmation work can be performed in exactly the same manner by using the confirmation jig using the dial gauge 204 similar to that of the first embodiment.

In the second to fourth embodiments, the upper surface is a flat surface, but the lower surface may be a flat surface and the upper surface may have a stepped shape. As in the first embodiment, the upper and lower surfaces are stepped surfaces. Of course, it is good.

FIG. 10 shows a fifth embodiment of the present invention. The first to fourth embodiments are examples of molding a stepped molded product, but the illustrated example has one upper and lower punch,
Moreover, this is the case where a molded product having no step is molded.

The relative positional relationship between the lower punch 512 and the upper punch 513 before pressurization is important in order to obtain a precise dimension, and the upper and lower punches 512 and 513 are formed at an appropriate stage of the molding process.
It is necessary to confirm the relative positional relationship between the die 511 and the die 511.

Also in this example, at the die confirmation position, the upper end surface of the lower punch 512 is flush with the upper surface of the die 511 as shown in FIG.

Further, the lower end surface of the upper punch 513 is set at a position separated from the reference surface of the lower punch 512, that is, the upper surface of the die 511 by a specified distance, and the dial gauge 204 similar to that of the first embodiment is used. The confirmation work can be performed in exactly the same manner using the confirmation jig 200 that has been used.

In each of the above-mentioned embodiments, the position of the die surface is confirmed by the dial gauge in this embodiment, but in addition to this, for example, a contact type displacement sensor such as an operating transformer, an eddy current type or a laser type is used. Various sensors such as a non-contact sensor or an air micro can be used. Further, a plurality of dies may be simultaneously measured by using a measurement jig incorporating a plurality of sensors for simultaneously measuring the relative positional relationship of the plurality of dies.

Further, in the case of automatic confirmation, a robot may be used to determine the measurement position of the mold and perform the measurement.

[0129]

As described above, according to the present invention,
Even if there are mold manufacturing errors or data input mistakes, by checking the relative positional relationship of each mold before pressurization, it is possible to prevent damage to the mold and to ensure safety. As a result, it is possible to supply molded products of stable quality.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a method for confirming the mold position of a powder molding press of the present invention.

2 (a) to 2 (e) are views showing a molding process of the powder molding press of FIG. 1, FIG. 2 (f) is a longitudinal sectional view showing an example of a molded product, FIGS. (h) is an enlarged cross-sectional view showing the end shape of the punch, and (i) is a drawing showing the upper punch unit raised position.

FIG. 3 is a diagram showing an example of a tool setting unit of a powder molding press to which the present invention is applied.

4 shows the upper punch unit of FIG. 3,
3A is a vertical sectional view, FIG. 2B is a top view, and FIG. 1C is a perspective view of a connecting end portion.

FIG. 5 shows the clamper unit of FIG.
The figure (a) is a longitudinal sectional view, and the figure (b) is a plan view of the connection end portion.

FIG. 6 is a diagram showing a configuration example in which a clamper unit of the tool setting unit in FIG. 3 is not used.

FIG. 7 is a diagram showing a second embodiment of the present invention.

FIG. 8 is a diagram showing a third embodiment of the present invention.

FIG. 9 is a diagram showing a fourth embodiment of the present invention.

FIG. 10 is a diagram showing a fifth embodiment of the present invention.

[Explanation of symbols]

1 Tool Set 2 Die Hole 3 Die 3a Die Top 4 Upper Punch Unit 41, 42, 43 1st, 2nd, 3rd Upper Punch 5 Lower Punch Unit 51, 52, 53 1st, 2nd, 3rd Lower Punch 54 Core rod 6 Punch operating unit 7 Clamper unit 9 Upper ram 10,11 1st, 2nd upper punch operating cylinder 35, 36 1st, 2nd lower punch plate 38 Fixed plate 39 Pulling down plate 62, 63 1st, 2nd lower punch Working cylinder 64 Core rod working cylinder 411, 421, 431 First, second and third upper punch position sensor 511, 521 First, second and third lower punch position sensor 541 Core rod position sensor 301 Die position sensor 200 Confirmation jig 201 upper end surface 202 lower end surface 203 retainer 204 dial gauge 205 probe 2 6 gauge body 207 arm W molded article W1 first step portion W2 second step portion W3 third step portion

Claims (11)

[Claims] 1. A powder molding press for molding a powder molded product by relatively moving a plurality of molds such as a die and an upper and lower punches with each other, and a mold confirmation position for confirming a relative positional relationship of the molds prior to pressurization. Set, and measure the relative positional relationship of the plurality of molds at the mold confirmation position to check whether the measured value is the same as the set value, and make sure that the measured value is the same as the set value. A method for checking / correcting a die position in a powder molding press, characterized by correcting a relative positional relationship between the two. 2. The powder molded article is a stepped molded article, and the powder portion corresponding to each step portion is pressed so as to always have the same degree of compression during the pressurization. Method for checking and correcting mold position in powder molding press. 3. The mold confirmation position according to claim 1, wherein the position of another mold is confirmed and corrected with reference to any one of the plurality of molds. How to confirm and correct the mold position of the powder molding press. 4. The method for confirming / correcting a die position of a powder molding press according to claim 3, wherein the reference die is a die. 5. A lower punch is used as a reference die.
A method for checking and correcting the die position of the powder molding press described in. 6. The reference die is an upper punch.
A method for checking and correcting the die position of the powder molding press described in. 7. When the lower punch is used as a reference and a plurality of lower punches are provided, one of the plurality of lower punches is used as a reference and the other lower punch is used as a reference. The die position confirmation / correction method of the powder molding press according to claim 5, wherein the position of the lower punch is confirmed / corrected together with other molds such as a die and an upper punch. 8. When the upper punch is used as a reference and a plurality of upper punches are provided, one of the plurality of upper punches is used as a reference and the other upper punch is used as a reference. The die position confirmation / correction method of the powder molding press according to claim 5, wherein the position of the upper punch is confirmed / corrected together with other dies such as a die and a lower punch. 9. After confirming and correcting the relative positional relationship of the molds,
The relative positional relationship between the molds is confirmed and corrected again after a prescribed time has elapsed or when a prescribed number of moldings has been reached, or 1, 2, 3, 4, 5, 6, 7 or 8. A method for checking and correcting the mold position in the powder molding press according to 8. 10. The confirmation / correction of the relative positional relationship of the molds is performed manually and corrected manually. A method for checking and correcting the die position of the powder molding press described in. 11. The confirmation / correction of the relative positional relationship of the molds is performed by automatically confirming and correcting automatically. A method for checking and correcting the die position of the powder molding press described in.