JPH048131B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a punching method using a turret punch press machine suitable for obtaining products of arbitrary shapes from a workpiece material.

In order to obtain a product with a desired complex shape from a workpiece material such as a fixed-length metal plate, cutting into the desired shape with a band saw, melt cutting method, or electric discharge machining method can be considered. The method using a saw has a limit to the shapes that can be drawn by this pulling.
It is not suitable for processing arbitrary shapes, has limitations such as processing speed and materials that can be processed, and has disadvantages such as leaving blade marks on the cut surface and requiring sanding after cutting.

Further, although the melt cutting method and the electric discharge machining method have no restrictions on the shape to be machined, they have the drawbacks that the structure of the processing equipment itself is complicated and the cost is high.

Compared to these processing methods, the punching method using a numerically controlled turret punch press machine positions the workpiece material and rotates the turret substrate to punch the material on the turret substrate according to the processing shape based on commands from the control device. The workpiece material is positioned and punched out at high speed by quickly selecting from a large number of molds that can be inserted and removed, and by hitting the selected mold with a hammer, making it highly versatile and fast. It is possible to quickly obtain a large amount of products with a large number of punched parts in a short time, and is suitable for mass production.

In recent years, the shapes of punching processes have become diverse and diverse, and the required punching precision has become increasingly strict. In order to meet these demands, it is considered to mount as many molds with different punching shapes on the turret board as possible, and the area of the turret board has become larger year by year, and as a result, the turret punch press itself has become larger. and prices are becoming higher.

However, there is a limit to the number of molds that can be mounted on a turret board, and it is not possible to prepare an unlimited number of types of expensive molds. Therefore, the processing shape is restricted by the number of molds, and the processing shape cannot be changed freely.Especially when processing products with diagonal straight lines or curved shapes that are larger than the punched shape of the mold. This was considered to be the limit of what could be processed using a turret punch press machine.

As a compromise, if you are trying to use this turret punch press machine to create a product that includes diagonal straight lines or curved parts, you can prepare a round mold and overlap some of the punches to create the required product. It is conceivable to perform continuous punching along the outer edge of the shape to obtain a product with a shape close to the desired shape, but in this case, wavy and jagged irregularities will occur at the joints of the overlapping punches, and smooth machining will not be possible. As a result, a post-processing process such as sanding is required, which negates the advantages of the turret punch press machine, such as its high speed and processing accuracy, which are its original performance characteristics, making it impractical.

As a result of examining the problems of the conventional technology, the present inventor found that the limit of the processing range of the turret punch press machine is that there is a directionality in molds of shapes other than round molds, and this gives freedom in processing. We focused on the fact that the problem was that we had previously tried to solve the disadvantages of having a directional pattern by increasing the number of molds installed, and decided to eliminate the directional pattern of the mold. Therefore, the present invention was developed based on the idea that the processing range can be dramatically increased without increasing the number of molds installed.

In addition, conventionally, in the field of turret punch press machines, the upper die is strongly hit with a hammer, and the upper die and lower die work together to punch out the workpiece material, so the upper die and lower die are The accuracy of alignment with the mold is extremely important, and if there is any misalignment between the two, there is a risk of damaging the mold or destroying the main body of the device.
In order to prevent this, a structure is adopted in which the upper and lower turret substrates themselves, which are rotated for mold selection, are firmly fixed with shot pins or the like, and then the upper mold is struck with a hammer. Similarly, there was a fixed idea that the molds to be mounted must be firmly fixed on the turret substrate, an absolute condition. This fixed idea is thought to have led to the idea that in order to increase the processing range, it is sufficient to increase the number of molds installed.

Therefore, in order to use a mold with a directional shape other than a round shape with no directionality, the idea of further rotating the mold on a rotatable turret substrate was completely out of the question.

By the way, when focusing on simply rotating a mold, as related prior art, for example, the specifications of US Pat. No. 3,581,535 and US Pat. No. 3,696,655 describe a technology related to a blade processing device. In this method, the upper and lower dies are rotated to a desired angle, and the hoop material is punched by changing the angle of the dies, but the hoop material is fed only in one direction. The relative positional relationship between the mold and the hoop material is constant, and the rotation of the mold is to form notches at different angles with respect to the hoop material. There is no change in the relative positional relationship with the material, and it is not possible to punch out continuous diagonal straight lines or continuous curved lines with dimensions larger than the cutting blades of the upper and lower dies.

Moreover, this mold rotation mechanism has a structure that is difficult to apply to turret punch press machines, and the punch, punch shank, punch holder, stripper, and stripper guide are assembled together and fixed with screws, and the gear is directly attached to the structure. is fixed and integrated into the punch assembly, and the punch can be rotated by applying rotation to this gear, and the die side is also constructed in the same way.

Therefore, the turret punch press machine does not have the ease of exchanging the molds, which is a feature of the turret punch press machine, and it is practically impossible to frequently change the molds according to the processing.

Furthermore, Japanese Utility Model Application Publication No. 50-23780 discloses a technique in which the punch and die are housed in a holder in order to change their direction. Or manually set the screws each time.
It requires loosening and tightening, and is completely inapplicable to punching while changing direction automatically and continuously. This also securely fixes the mold.

In this way, conventional techniques for changing the angle of a die are limited to punching within a range where no force is generated to rotate the die, or punching that is performed with the die firmly fixed. However, it is beyond the scope of the above-mentioned fixed idea, and it is extremely difficult to apply these conventional techniques as they are while taking advantage of the ease of mold replacement of the turret punch press machine.

This invention has been made based on the above-mentioned background, and enables a new punching process that could not be realized or imagined using the conventional processing method using a turret punch press machine. A punching portion having the same shape as the punching shape of the plurality of pairs of upper and lower molds, and a pair of cutting blades of the upper and lower molds housed in a pair of upper and lower mold holders that can be rotated and positioned. It is an object of the present invention to provide a punching method using a turret punch press machine that can produce punched products of arbitrary shapes having diagonal straight lines or curved punched parts with dimensions larger than the dimensions at high speed and with high accuracy. It is something that does.

In order to achieve the above-mentioned object, the present invention rotates a pair of directional upper and lower molds each having a cutting blade in a shape other than a round shape to an arbitrary position within a full-width range of 360 degrees. The upper mold turret substrate and With the lower mold turret substrate rotated and the workpiece material placed between the upper and lower molds, (a) workpiece material positioning operation to position the workpiece material at the desired position, (b) the selected upper The action of hitting the mold with a hammer; (c) the upper and lower mold holders are The rotary positioning operation of the mold, which rotates and positions the directional upper and lower molds at a desired angle, the above three operations and their order,
One-shot punching is selected according to the required processing form of the workpiece material, and is automatically repeated many times in synchronization with commands from a numerical control device, while rotating a directional die. It is characterized by obtaining a punched product having a punched part by the processing and a punched part with a diagonal straight line or curve having a dimension larger than the dimension of the cutting edge punched by the same continuous overlap punching process. That is.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a sectional view showing an embodiment of the present invention.
Reference numeral 1 denotes a servo motor that provides a rotational force necessary to change the angle of a mold attached to a base 3 on a rotating shaft 2. The rotational force of the servo motor 1 is transmitted to the output shaft 4, and bevel gears 5 and 6 are fixed to the output shaft 4, and bevel gears are fixed to the tips of joint shafts 9 and 10 that mesh perpendicularly to the bevel gears 5 and 6. Change the direction with 7 and 8, and connect the connecting shaft 9 and connecting shaft 1.
0. The rotating shaft 2 is connected to an upper mold turret substrate 17 and a lower mold turret substrate 2 for mounting a plurality of pairs of molds having different punching shapes, that is, molds having round or other shaped cutting edges.
6 and the support that rotates the base 3, from the prime mover 11 to the reduction gear 1 attached to the prime mover 11.
2 and a reduction gear 13 attached to the rotating shaft 2. The rotating shaft 2 is
It is supported by a bearing 14 placed in the middle and a bearing 15 placed at the bottom. Further, the other end of the output shaft 4 which receives the rotational force of the servo motor 1 is also supported by a bearing 16 fitted into the base 3. The joint shaft 9 is arranged parallel to the upper mold turret substrate 17 and is connected to the base 3 of the upper mold turret substrate 17.
A bearing 19 fitted into a housing 18 placed on the side, and housings 22 and 23 placed on both sides of a worm 21 that rotates the upper mold holder 20.
It is supported by bearings 24 and 25 fitted therein and connected to the worm 21. joint shaft 10
are arranged parallel to the lower mold turret substrate 26,
A bearing 27 is arranged on the base 3 side on the lower mold turret board 26 and between it and the upper mold turret board 17.
and a worm 29 that rotates the lower mold holder 28.
The worm 29 is supported by bearings 32 and 33 fitted in housings 30 and 31 disposed on both sides of the worm 29, and is connected to the worm 29.

The upper mold holder 20 holds an upper mold 34, and the upper limit is determined by a receiving plate 35. A lower mold 36 is held in the lower mold holder 28 . A workpiece material 37 is inserted between the upper mold 34 and the lower mold 36, and the hammer 38 presses down the upper mold 34 to punch out the workpiece material 37. The mechanism described above is incorporated into the frame 48. Next, the mold holding mechanism will be explained in detail.

In FIG. 2, the upper mold holder 20 accommodates and guides the upper mold 34 in its central portion, and has a foam foil at its upper outer periphery, which engages with the worm 21 to determine the rotational position of the upper mold 34. Reference numeral 39 denotes a keyway cut into the hole surface for accommodating the upper mold 34 and determining the direction of the upper mold 34. This keyway 39 has an upper mold 34
A key 40 for determining the direction of the upper mold 34 protruding from the sliding surface of the mold is fitted. The upper limit of the receiving plate 35 is determined by a stopper 41 and lifted by a spring 42. Reference numeral 43 denotes a retaining fitting for the upper mold 20. The lower mold holder 28 accommodates and guides the lower mold 36 in its center, and has a worm wheel at its upper end outer periphery that engages with a worm 29 to determine the rotational position of the lower mold 36. A key 44 protrudes from the side surface of the lower mold 36 in order to determine the direction of the lower mold 36, and is fitted into a key groove 45 of the lower mold holder 28. Further, the lower mold holder 28 is held on the lower mold turret substrate 26 by a retaining fitting 46. Figure 3 is a sectional view taken along A-A' in Figure 2, and shows the upper mold holder 2.
0 and the worm 21 are shown. Figure 4 is a sectional view taken along line B-B' in Figure 2, showing the lower mold holder 2.
8 and the worm 29.

As explained above, the present invention transmits the rotation of the servo motor 1 attached to the base 3 on the rotating shaft 2 to the output shaft 4, and the rotational force of the output shaft 4 is transmitted to the The worm 21 and the worm 29 are simultaneously rotated through rotational direction changing devices such as the gear 5 and the bevel gear 6, and the worm 21 and the worm 29 are simultaneously rotated through the rotational direction changing device such as the bevel gear 7 and the bevel gear 8. Then, remove the upper mold holder 20,
Further, the lower mold holders 28 are each rotated simultaneously by the worm 29.

Next, the operation will be explained.

When the servo motor 1 rotates according to the specified value based on a numerical command from the outside, the bevel gears 5 and 6 fixed on the output shaft 4 rotate, and this rotation is transmitted to the bevel gears 7 and 6.
8. Since the bevel gears 7 and 8 are fixed to the joint shafts 9 and 10, respectively, the joint shafts 9 and 10
Rotate. Since the worms 21 and 29 are connected to the other ends of the joint shafts 9 and 10, respectively, the worms 21 and 29 rotate. This warm 21,
29 are engaged with the upper mold holder 20 and the lower mold holder 28, respectively, so the upper mold holder 20
and the lower mold holder 28 rotates. Servo motor 1
Upper mold holder 20 and lower mold holder 2 due to rotation of
Since the bevel gears 5, 6, 7, 8, the worms 21, 29, and the worm foils of the upper mold holder 20 and the lower mold holder 28 are respectively combined so that the amount of rotation angle of the mold 8 is equal, The position of the keyway 39 cut in the upper mold holder 20 and the position of the keyway 45 cut in the lower mold holder 28 are always in the same direction. Therefore, the position of the upper mold 34 inserted into the upper mold holder 20 and the position of the lower mold 36 attached to the lower mold holder 28 are always at the same direction and angle.

Now, the lowering of the hammer 38 strikes the upper die 34, the upper die 34 descends and punches out the workpiece material 37, and then the hammer 38 rises and punches out the workpiece material 37.
The servo motor 1 rotates according to the command value from the time when the upper mold holder 34 is separated from the upper mold holder 34 until the upper mold 34 comes into contact with the workpiece material 37 in the next punching command, and the upper mold 34 and the lower mold holder are separated from each other. 36 and controls the servo motor 1 so that positioning is completed.

The above control, punching operation and workpiece material 37
By combining with positioning synchronization, not only single punching but also continuous punching becomes possible.

As explained above, the present invention breaks away from the fixed idea of firmly fixing the mold as in conventional turret punch press machines, and makes it rotatable in order to eliminate the directionality of the mold. A pair of directional upper and lower molds with cutting blades of a different shape are placed in a pair of upper and lower mold holders that can be rotated to any position within a full 360 degree range. Rotate the upper and lower mold turret substrates so that the upper and lower molds with directional punching shapes other than round, which are removably housed, are placed below the hammer. A workpiece positioning operation for positioning the workpiece material at a desired position with the workpiece material placed between the molds, an action for hitting the selected upper mold with a hammer,
From the time the cutting blade of the upper mold leaves the workpiece material to the time the cutting blade contacts the workpiece material in the next punching operation, the upper and lower mold holders are rotated to create a directional upper and lower mold. The mold rotation positioning operation to position the orientation at the desired angle, the above three operations and their order are selected according to the required processing form of the workpiece material, and are automatically performed in synchronization with commands from the numerical control device. The parts are punched out by a one-shot punching process that is repeated many times and rotated with a directional die.
Similarly, since a punched product having a diagonally straight or curved punched portion having a dimension larger than the dimension of the punched cutting blade is obtained by continuous overlap punching, the following effects are produced.

(1) A single punching point with the same shape as the punching shape of multiple pairs of upper and lower dies, and a pair of upper and lower dies accommodated in a pair of upper and lower die holders that can be rotated and positioned. It has become possible to obtain punched products of any shape with diagonal straight lines or curved continuous overlapped punching (notches) with dimensions larger than the dimensions of the blade at high speed and with high precision.

(2) In particular, when punching a curved line with a large radius of curvature compared to the diameter of the die, when performing continuous overlapping punching using a round die using a conventional turret punch press machine, wavy The degree of jaggedness and unevenness was severe, making it unusable as it was, but with the method of this invention, a smooth curve can be obtained regardless of the radius of curvature of the curve, and post-processes such as sanding are not required at all. I don't. Therefore, it has become possible to perform high-precision machining at high speed using a turret punch press machine, which was previously thought to be possible only by cutting.

(3) Conventionally, with a turret punch press machine, the range that can be punched is limited by the number of molds installed, and the punching range is limited. In the case of single-shot punching, only one type of shape can be punched out, but according to the present invention, even in the case of single-shot punching, the number of shapes increases dramatically depending on the resolution of the rotation angle of the rotatable mold. For example, the resolution
If the temperature is set to 0.05 degrees, 7,200 punching patterns can be made with one mold, which is equivalent to mounting 7,200 molds on a turret board. In addition to this single punching, if we consider the punching shape by continuous overlap punching, if the shape of the mold cutting edge is a deformed quadrilateral, the same number of punches can be punched on each side, so 28800
This makes it possible to punch out 36,000 different patterns including single punching. This is a conservative estimate, and if we include the punching shape created by other mounted molds that cannot rotate, and the case where the insertable and removable mold is replaced with another type of mold, the punched shape will be surprisingly small. This increases the range that can be processed by the turret punch press machine, making it possible to perform continuous overlapping punching and single-shot punching of large shapes and dimensions that were previously impossible.

(4) Since the processing range of one mold is expanded, the number of molds to be prepared can be reduced, which helps save mold costs. For example, in the past, when processing an unprecedented punching shape, a mold of the same size as the processed shape had to be manufactured each time.
Large molds are extremely expensive, and the press body to which the molds are attached is also special, making it cost-effective unless it is a mass-produced product.However, according to this invention, small molds that already exist can be used. Using a mold, it becomes possible to perform punching of the requested shape, and the time required for manufacturing a new mold is not required, allowing for prompt response and saving the cost of creating a new mold. Therefore, it is highly versatile and suitable for high-mix, low-volume production.

(5) The positioning of the workpiece material and the mold rotation angle are performed from the time the cutting blade of the upper mold leaves the workpiece material until the time the cutting blade contacts the workpiece material according to the punching command. , punching can be performed at the same speed as when processing with a non-rotating die.

[Brief explanation of drawings]

Figure 1 is a sectional view of the entire turret punch press machine used in the present invention, Figure 2 is a sectional view of the mold holding mechanism in Figure 1, Figure 3 is a sectional view of the upper mold holder, and Figure 3 is a sectional view of the upper mold holder. FIG. 4 is a sectional view of the lower mold holder as well. In the figure, 1 is a servo motor, 2 is a rotating shaft, 3 is a base, 4 is an output shaft, 9, 10 are joint shafts, 21, 29
20 is an upper mold holder, 28 is a lower mold holder, 17 is an upper mold turret substrate, 26 is a lower mold turret substrate, 34 is an upper mold, and 36 is a lower mold.

Claims (1)

[Scope of Claims] 1. To select and arrange a desired pair of upper and lower molds below the hammer from among a plurality of pairs of upper molds and lower molds each having a different punched shape and mounted on the upper mold turret substrate and the lower mold turret substrate. an operation of rotating the upper mold turret substrate and a lower mold turret substrate, an operation of positioning a predetermined location below the hammer where the workpiece material is to be processed, and with respect to the positioned workpiece material, The operation of hitting the selected upper mold with a hammer is repeated, and a single punching process is performed in which the mold shape and the punched shape match, and a part of the punched shape overlaps with a later punched shape. In a punching method using a turret punch press machine in which a workpiece material is subjected to continuous overlapping punching to create a single shape, Upper and lower mold holders that can be rotated to any position within the full width range of
The upper and lower mold turret substrates are rotated so that the upper and lower molds with a punching shape other than a round shape and directional, which are removably housed, are placed below the hammer. With the workpiece material placed between the two molds, (a) workpiece material positioning operation to position the workpiece material at a desired position, (b) action of hitting the selected upper mold with a hammer, (c ) The upper and lower mold holders are rotated from when the cutting blade of the upper mold leaves the workpiece material to when the cutting blade comes into contact with the workpiece material in the next punching operation. The rotary positioning operation of the mold to position the upper and lower molds at the desired angle.The above three operations and their order are selected according to the required processing form of the workpiece material, and the commands from the numerical control device are executed. A punched part is punched out by a one-shot punching process that is automatically repeated many times in synchronization with the rotatable mold holder while rotating a directional mold housed in the rotatable mold holder; A punched area with diagonal straight or curved dimensions larger than the dimensions of the punched cutting blade by continuous overlapping processing performed while rotating a directional mold housed in a rotatable mold holder. A punching method using a turret punch press machine, characterized by obtaining a punched product having the following. .