JPH0471731A - Punch press providing tapping device - Google Patents

Abstract

PURPOSE:To detect the break of the tap or the punch and to prevent the defective from generating by setting the hollow coil at the down end of inner circumference of the punch press, and providing the detecting circuit to detect the break of the tap or the punch with the variation of the resistant value. CONSTITUTION:The hollow coil 63 is mounted at the down end of inner circumference of the die mounting cavity 41 of the turret or the down end of inner circumference of the punch guide 43. When the tapping work or the punching work is executed, because the tap or the punch passes through the above hollow coil 63, the resistance of the hollow coil is different for the normal case when the tap or the punch does not break or for the abnormal time when the tap or the punch breaks. By detecting the difference of this resistance with the detecting circuit, the break of the tap or the punch can be exactly detected.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a punch press equipped with a tapping device, and more particularly, to a punch press equipped with a tapping device or a tapping device installed in a mold installation hole of a turret. This invention relates to a punch press equipped with a tapping device capable of detecting taps of punches or breakage of punches.

(Conventional technology) Conventionally, in the mold mounting hole of the turret in a punch press,
None of the devices equipped with a tapping device or a punch is equipped with a device for detecting tap breakage or punch breakage.

(Problem to be Solved by the Invention) By the way, as mentioned above, the turret punch press equipped with a tapping device is not equipped with a device for detecting tap breakage or punch breakage. You have to check for folds, and sometimes the tap or punch ends up being machined even though it is broken. As a result, there have been problems in that machining is hindered and malfunctions occur.

An object of the present invention is to provide a punch press equipped with a tapping device that can reliably detect the breakage of a tap or punch and that can be easily assembled to a turret. It is about providing.

[Structure of the Invention (Means for Solving the Problems)] In order to achieve the above object, the present invention provides a method of attaching a tapping device or a punch to a mold attachment hole of a turret in a punch press, and performing tapping or punching. The punch press is equipped with a hollow coil at the lower end of the inner periphery of the mold mounting hole or the lower inner periphery of the punch guide, and a detection circuit that detects tap or punch breakage based on a change in resistance value in the hollow coil. Thus, a punch press equipped with a tapping device was constructed.

(Function) By employing a punch press equipped with the tapping device of the present invention, a hollow coil is attached to the lower inner circumferential end of the mold mounting hole of the turret or the inner circumferential lower end of the punch guide. During processing, the tap or punch passes through the hollow coil, so the resistance of the hollow coil is different between a normal case where the tap or punch is not broken and an abnormal case where the tap or punch is broken. By detecting this difference in resistance with a detection circuit, a broken tap or punch can be reliably detected.

(Example) Hereinafter, the present invention will be described in detail based on the accompanying drawings.

First, the relationship between the punch press and the tapping device or punch will be explained with reference to FIG.

The turret punch press 1 includes a frame 5 with a bosom portion 3. This turret punch 1 includes a fixed table 7 that supports a plate-shaped workpiece W, a workpiece positioning device 9 that positions the workpiece W, and a circular plate equipped with an appropriate number of tapping devices 11 or punches (not shown). A turret device 19 comprising a shaped upper turret 13 and a disc shaped lower turret 17 provided with an appropriate number of perforated tables 15 or dies (not shown) at lower positions corresponding to the tapping device 11 and punches. is installed.

Further, the upper frame 21 is provided with a striker 23 for hitting the tapping device 11 of the upper turret 13 and a ram body 25.
is installed so that it can be raised and lowered.

Further, a horizontal striker moving device 27 is provided between the striker 23 and the ram body 25 in order to selectively strike the tapping devices 11 or punches arranged in the radial direction of the upper turret 13.

Next, the tapping devices 11 arranged in the radial direction of the upper turret 13 in FIG. connected.

Further, one of the tapping devices 11 is meshed with a spur gear 31 that rotates coaxially and integrally with two turret upper pulleys supported by the turret.

The above-mentioned turret pulley 29 is rotated by a known drive mechanism. That is, it is connected by a timing belt to a lower intermediate pulley 35 of a power transmission device 33 that includes a hydraulically operated coupling/detachable clutch. Further, the upper intermediate pulley 37 of the power transmission device 33 is connected to a motor pulley of a drive motor 39 attached to the upper frame 21 by a timing belt.

With the above configuration, the operation is as follows: When the drive motor 39 is first rotated, the upper intermediate pulley 37 of the power transmission device 33 is rotated, and when the detachable clutch is connected by fluid pressure operation, the lower intermediate pulley 37 is rotated. 35 is rotated, the timing belt rotates the turret upper pulley 29 and the spur gear 3.
1 is passed.

Therefore, the driven gears of an appropriate number (three in the figure) of the tapping devices 11 on the upper turret 13 are rotated all at once. however,
In the case of the first embodiment described later, the driven gears of the three tapping devices 11 are connected via the idle gear and are rotated in the same direction, but in the case of the second embodiment described later, the driven gears of the three tapping devices 11 are connected via the idle gear. Since the driven gears are directly meshed, the driven gears of adjacent tapping devices 11 are rotated in opposite directions. Therefore, in the case of the second embodiment, the rotation direction of the drive motor 39 must be selected in accordance with the machining rotation direction of the desired tapping device 11 equipped with the desired tap.

Next, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

The tapping device 11 is mounted in a mold mounting hole 41 formed in the upper turret 13 so as to be slidable up and down.

First, the punch guide 43 is fitted into the mold mounting hole 41 so as to be slidable up and down, and the punch guide 43 is inserted into the mold mounting hole 41 so as to be slidable up and down.
It is always urged upward by a lifting spring 45 installed between the step part and the step part. Note that a slit 47 is cut in the upper flange portion and slides onto a bolt 49 installed at the bottom of the stepped portion of the mold mounting hole 41, so that the punch guide 4
3 cannot rotate with respect to the mold mounting hole 41. In addition, the upper end of the vertical stroke is held down by the head of the bolt 49,
The lower end becomes the bottom dead center of the striker 23 or the contact point between the outer circumferential stepped portion 51 of the punch guide 43 and the stepped bottom of the mold mounting hole 41. (This is the contact point when performing quick approach or punching with a fluid pressure cylinder instead of the striker 23.) A bearing is provided on the inside of the upper part of the punch guide 43, and above the bearing, spur teeth are cut on the outer periphery and the inner periphery is The driven gear 53 having a female spline 53a cut thereon is rotatably mounted.

Next, a male spline 55a that engages with the female spline 53a is cut on the outer periphery of the upper part, and a tap holder 55 with a tap 57 attached to the lower end is attached to the male and female splines 53a.
, 55a, and is supported in a non-rotatable manner so as to be slidable up and down.The lower part is slidable up and down by a bearing provided on the inner periphery of the punch guide 43.

It is rotatably supported. Note that a female lead screw 55b is cut in the center of the upper part of the tap holder 55.

Next, a cap 59 is placed on the upper surface of the punch guide 43 and fastened with bolts or the like.

This cap 59 has a male lead screw 59a at its center, which engages with the female lead screw 55b.

Further, there is a bearing on the inside upper part of the cap 59, and the driven gear 5
The upper part of 3 is rotatably supported from the inside.

Note that there is a notch 59b in a part from the top to the bottom of the cap 59, and the spur gear 31. Turret top pulley 2
9 and the idle gear 61 from above.

(See also Figure 2) These idle gears 61 and spur gears 3
1 meshes with the driven gear 53 through spur teeth, and is slidable relative to each other in the axial direction.

On the other hand, on the upper part of the cap 59, as shown in FIG.
A striker 23 that is operated up and down by the ram body 25
There is an appropriate number of tapping devices 11 or punches lined up on the upper turret 13 and a striker horizontal moving device 2.
7 allows you to attack selectively.

A hollow coil 63 is attached to the lower end of the punch guide 43 to surround the tap 57 when the tap 57 and the tap holder 55 are in the raised position relative to the punch guide 43. ing.

In order to quickly and accurately measure the resistance value of the hollow coil 63, a resistance detection circuit 65 as shown in FIG. 5 is provided. This resistance detection circuit 65 is a well-known type called a Wheatstone bridge. That is, as shown in Fig. 5, four resistors R1Ra, Rb, and Rc are arranged in a diamond shape,
A galvanometer G is connected to the upper and lower ends, and a power source S (in this case, an AC power source) is connected to the left and right ends.

This resistance detection circuit 65 has a resistance value R− of the four resistances.
A feature is that no current flows through the galvanometer G under the condition of Rc-RaΦRb. Therefore, by connecting the hollow coil 63 to the location R in FIG. Tap 57 and hollow coil 6
If the galvanometer G is adjusted so that no current flows when G is in the position shown in FIG. 1 or FIG. Since the capacitance of the body is greatly reduced or eliminated, the value of the resistance R is greatly reduced, and a potential difference is created between both ends of the galvanometer G, causing a current to flow. can be sensed accurately.

This will become easier to understand if you look at Figure 6. That is, 偲) shows the relative position of the tap 57 with respect to the hollow coil 63 when the workpiece W is approached.

In addition, (b) shows the state where the tapping process has been completed.

If the tap 57 breaks, even if the tap holder 55 returns to its original approach position, it will not return to the state of q), so the capacitance of the magnetic material at the center of the hollow coil 763 will decrease as shown in (C). Therefore, the resistance value also decreases.

Since the resistance detection circuit 65 operates on the same principle as described above,
Naturally, the punch guide 43 to which the hollow coil 63 is attached is made of non-magnetic material, or a stopper plate made of non-magnetic material is provided at the lower end of the punch guide as shown in FIG. A hollow coil 63 must be installed therein.

Next, the operation of the first embodiment will be explained with reference to FIGS. 1, 2, 5, 6, and 8.

First, the striker horizontal movement device 27 is operated to position the striker 23 above a desired tapping device 11 on which a desired tap 57 is attached.

Next, when the ram body 25 is lowered, the striker 23 is also lowered and comes into contact with the upper surface of the cap 59.

When the striker 23 is further lowered to the bottom dead center, the punch guide 43 and the tap 5 resist the biasing force of the lifting spring 45.
7 or a certain height h while the desired tap 57 is lowered.
makes a quick approach to work W. At this time, the driven gear 53, spur gear 31, and idle gear 61 slide in the axial direction due to spur teeth.

Next, the drive motor 39 is rotated forward and the clutch of the power transmission device 33 is connected. Appropriate number of (Fig. 2.

In FIG. 8, there are three driven gears 53 of all tapping devices 11.
is the turret upper pulley 29. The spur gear 31° is rotated in the normal rotation direction via the idle gear 61.

Then, the tap holder 55 rotates normally due to the engagement of the male and female splines 53a and 55a. However, the punch guide 43 does not rotate relative to the upper turret 13 due to the action of the bolt 49 and the slit 47. Therefore, the cap 59 attached thereto also does not rotate. Therefore, the tap holder 55 moves down by one lead per rotation due to the action of the male and female lead screws 55b and 59a, and the tap 57 also moves in the same way.

In this operation, only the desired tap 57 has already been approached by the striker 23, so it enters the punch hole of the workpiece W and enters the tapping to complete the tapping process, but the other tappings 57 have not been approached. , the work W does not reach the tapping height t at a rate of 1 lead per revolution.

When it is sensed that the tapping process is completed, the clutch of the power transmission device 33 is disengaged, the drive motor 39 is reversed, and the clutch is engaged again. Since all the driven gears 53 are reversed, the tap 57 has a male and female per revolution. The lead screws 55b and 59a are raised by one lead. Therefore, the desired tap 57 comes out of the workpiece W and returns to the approach position without damaging the tapped hole. Then, when the clutch of the power transmission device 33 is disengaged and the drive motor 39 is stopped, all driven gears 53 stop rotating.

At this time, the resistance value of the hollow coil 63 is checked by the resistance detection circuit 65. It is sufficient if it is the same as before processing, but if it has decreased significantly, it is determined that the tap 57 is broken. In addition, Fig. 6 (C) shows an example where the tap is broken at the handle (shank), but even if the screw part is broken, the resistance value will still decrease by a large amount, although the degree may vary. do.

Next, when the striker 23 is raised, the desired tapping device 11 follows and rises by a certain height h due to the urging force of the lifting spring 45 until the upper end of the punch guide 43 comes into contact with the head of the bolt 49.

Further, as the striker 23 rises, it leaves the upper end of the cap 59 and returns to the position before the machining cycle. At this time too,
In other words, even after the machining cycle ends or before the machining cycle starts, in this first embodiment, the relative position between the tap 57 and the hollow coil 63 remains the same as when approaching the hollow coil 63, so the resistance value of the hollow coil 63 is detected by resistance detection. By checking the circuit 65, it is possible to determine whether the tap 57 is broken.

In any case, if it is determined that the tap 57 is broken, the broken tap 5
7. It is possible to prevent the production of defective products one after another.

Next, a second embodiment of the present invention will be described with reference to FIGS. 3 and 4.

The punch guide 67 of the tapping device 11 is mounted in a mold mounting hole 69 formed in the upper turret 13 so as to be slidable up and down. Further, the lower surface of the upper flange 67a of the punch guide 67 is guided by a bolt 71 attached to the upper turret 13 and supported by a lifting tube 75 that is always urged upward by a lifting spring 73.

In addition, as the arrangement of this lifting pipe 75 can be seen in FIG. 4,
It is also located at a position 180 degrees opposite the upper flange 67a, and urges the punch guide 67 upward from both sides. Further, since the upper surface of the upper flange 67a is in contact with the lower surface of the first plate 77 attached to the upper surface of the upper turret 13, the upper limit of the vertical movement stroke of the punch guide 67 is regulated. Note that the lower limit is regulated by the bottom dead center of the striker 23, and the strike and sober plate described later.

Next, a driven gear 81 is rotatably supported by a bearing on a first plate 77 and a second plate 79 fixed to the upper turret 13 at regular intervals of two. A spline cylinder 83 having a female spline 83a on its inner diameter is integrally fixed to the part with a key and a snap ring.

On the other hand, a ball bearing 8 is mounted on the upper end of the inner diameter part of the punch guide 67.
5, a flat bearing is provided at the intermediate portion, and a tap holder 87 is rotatably supported.

The tap 57 is fixed to the tap holder 87 with screws. However, this tap holder 87 has a hook portion 87.
a, which is hooked onto the top of the ball bearing 85.

Note that the tap holder 87 extends upwardly through the inner diameter portion of the female spline 83a, and extends upwardly through the inner diameter portion of the female spline 83a.
b, and a lead nut 89 having a male lead screw 89a on its outer periphery at the uppermost end is fixed by a grooved nut and a tongued washer.

Further, a female lead screw 91 that engages with the male lead screw 89a
The lead threaded pipe 91 having a
It is supported by a third plate 93 so as to be able to freely slide up and down but not rotate once. This third plate 93 is fixed to the upper turret 13 above the second plate 79 at a constant distance.

Further, since a stopper plate 95 is supported by a snap ring at the lower end of the third plate 93, the lower limit of the stroke of the lead threaded pipe 91 is regulated. Note that a fluid hole 87c opened in the center of the tap holder 87 from the upper end to the lower end is a passage for cutting oil that serves both to lubricate and cool the tap 57. The upper end of this passage is connected to a fluid hole provided in the striker 23 via a seal. However, this seal is provided between the upper end of the lead screw pipe 91 and the lower end of the striker 23.

Now, the driven gear 81 is connected to a shaft 97 that is rotatably supported by bearings on the first plate 77 and the third plate 93.
It is meshed with a spur gear 99 which is keyed. Furthermore,
A turret upper pulley 101 is keyed to this shaft 97, and is connected to the lower intermediate pulley 35 shown in FIG. 8 by a timing belt.

These axes 97. Driven gear 81. punch guide 67,
The relative position with respect to the lift pipe 75 will be apparent from the plan view of FIG. 4. According to this figure, the driven gears 81 of adjacent tapping devices 11 are directly meshed with each other.

A hollow coil 63 is installed at the lower end of the mold installation hole 69 of the upper turret 13, and the resistance detection circuit 6 of FIG.
It is incorporated in R of 5.

Next, the operation of the second embodiment of the invention will be explained.

First, in FIG. 8, the striker 23 is positioned over the desired tapping device 11 on which the desired tap 57 is mounted.

Next, when the ram body 25 is lowered, the striker 23 is also lowered. The lower surface thereof is brought into contact with the upper surface of the lead threaded pipe 91 via a seal.

At this time, through the fluid hole of the striker 23, the fluid hole 87
Cutting oil is flowed through the tap 57 to blow away dust from the tap 57 and provide lubrication and cooling during machining.

Further, when the striker 23 is lowered to the bottom dead center, the third
In the figure, the hook is part 87a, ball bearing 85° lifting pipe 75
Since the tap holder 87 and the tap 57 are lowered together with the punch guide 67 by a certain height h against the biasing force of the lifting spring 73, the desired tap 57 can quickly approach the work W. At this time, the male spline 87b of the tap holder 87 engages with the female spline 83a of the spline cylinder 83. Further, the lead screw pipe 91 is also pushed down by a certain height h by the striker 23 and comes into contact with the stopper plate 95.

Next, the drive motor 39 in FIG. 8 is rotated so that the desired tap 57 rotates in the machining direction, and the clutch of the power transmission device 33 is connected. The driven gears 81 of all the tapping devices 11 are rotated via the turret upper pulley 101° spur gear 99.

However, in the second embodiment, the male spline 87b of the tapping device 11 that is not approached by the striker 23
and the female spline 83a are not engaged, so the tap holder 87 does not rotate. Then, only the approached tap holder 87 is rotated together with the tap 57 in the processing direction. Then, the key is fixed to the third plate 93,
And the lead screw pipe 91 pressed against the striker 23
Since the male lead screw 89a of the lead nut fixed to the tap holder 87 is engaged with the acid lead screw 91a of
Since only the lead is lowered and fed by the lowering height t, the lead enters the punch hole of the workpiece W and the tapping process is completed. At this time, the punch guide 67 also descends by a height t via the hook portion 87a and the ball bearing 85.

When it is sensed that the tapping process has been completed, the clutch of the power transmission device 33 is disengaged, the drive motor 39 is rotated in the opposite direction to that used during machining, and the clutch is engaged again. The bottom surface is
Since it is in contact with the stopper plate 95 and cannot escape downward, it rises by one lead per rotation by the action of the male and female lead screws 918 and 89a. Therefore, the desired tap 57 comes out of the workpiece W and returns to the approach position without damaging the tapped hole. Then, when the clutch of the power transmission device 33 is disengaged and the drive motor 39 is stopped, the rotation of all driven gears 81 is stopped.

At this time, the resistance value of the hollow coil 63 is checked by the resistance detection circuit 65. It is fine if this resistance value is the same as before processing, but if it has decreased significantly, it is determined that the tap 57 is broken, as described in the first embodiment. If it is determined that the tap is broken, subsequent operation cycles are stopped to prevent the broken tap 57 from producing defective products one after another.

Next, when the striker 23 is raised, the approached tap 57. Tap holder 87. punch guide 67,
lead nut89. The lead screw pipe 91 is connected to the lifting pipe 75.
Due to the biasing force of the lifting spring 73 via the upper flange 67a, the upper flange 67a is raised by a certain height h until it comes into contact with the lower surface of the first plate 77. Immediately before this contact, the cutting oil in the fluid hole 87c is stopped.

Further, as the striker 23 rises, its lower end moves away from the upper end of the lead screw tube 91 and returns to the position before the machining cycle.

Next, FIG. 7 shows a third embodiment in which the hollow coil is applied to a punching device.

A punch guide 105 having an upper flange portion 105a is supported in the mold mounting hole 103 of the upper turret 13 so as to be vertically slidable. A punch body 107, which has a punch 107a protruding from the bottom and a handle 107b from the top, is inserted into the inner diameter hole so as to be slidable up and down from below, and the upper end of the handle 107b has a circular A plate 109 is attached with bolts. A strong leaf spring 111 is provided between the upper end of the flange portion 105a and always urges the punch body 107 upward.

On the other hand, there is a coil spring 113 between the stepped part of the mold mounting hole 103 and the lower end of the flange part 105a,
The punch guide 105 is urged upward.

Further, a stopper plate 115 made of a non-magnetic material is attached to the lower end of the punch guide 105, and a hollow coil 63 is attached thereon so as to surround the lower end of the punch 107a. Furthermore, this hollow coil 63 is incorporated in the R portion of the resistance detection circuit 65 in FIG. 5, as described in the first embodiment.

With the above configuration, in operation, first, when the striker 23 strikes the disk 109 from above, the coil spring 113 is compressed, and the punch guide 105 is held at a constant height until it comes into contact with the workpiece W. Only h are approached. Up to this point, the relationship between the punch body 107, the punch guide 105, and the hollow coil 63 is based on the strong leaf spring 111.
maintained by.

Furthermore, when the striker 23 descends to the bottom dead center, the leaf spring 111 is compressed, and the punch body 107 and the punch 107a integrated therewith further descend by the punching height p to punch the workpiece W. Complete.

Next, when the striker 23 is raised, the punch body 1
07 is the punch guide 1 due to the urging force of the leaf spring 111.
The punch 107a and the hollow coil 63 follow each other until they come into contact with the flange portion 105a of the punch 107a and return by the nine dimensions, and then move up by six dimensions while maintaining the relative position between the punch 107a and the hollow coil 63 due to the biasing force of the coil spring 113, thereby completing the work cycle. Return to the beginning.

At the end of this work cycle, or when six dimensions have been approached, the resistance value of the hollow coil 63 is checked by the resistance detection circuit 65 as explained in the first embodiment.

If this value is significantly smaller than the resistance value at the same related position before punching, it can be determined that the punch is broken, so by stopping the subsequent operation cycle, the broken punch 107a can be replaced with defective products one after another. is prevented from being produced.

It should be noted that the present invention is not limited to the above-described embodiments, and can be implemented in other embodiments by making appropriate changes.

For example, in the above embodiment, the mold mounting holes in the upper turret of the pallet punch press were arranged not only in the circumferential direction but also in the radial direction.

It has been explained that the hollow coil can be installed in a compact tapping device that is installed in the adjacent mold installation holes, but it is clear that it can also be applied to a multi-press that has more space.

[Effects of the Invention] As can be understood from the above description of the embodiments, according to the present invention, a change in resistance value due to the capacitance of the magnetic material in the center of the hollow coil can be detected using a detection circuit. This makes it possible to reliably detect tap breakage or punch breakage. In addition, it is installed in the turret mold installation hole,
A small and lightweight tapping device or punch can also be easily equipped with a detection device. Furthermore, since tap breakage or punch breakage can be reliably detected, defective products can be eliminated.

[Brief explanation of the drawing]

FIG. 1 is an explanatory axial cross-sectional view of a tapping device that is a first embodiment of the present invention, FIG. 2 is a plan layout diagram of the main parts of FIG. 1, and FIG. 3 is a second embodiment of the present invention This is an axial cross-sectional explanatory diagram of an example, showing a cross section along line 11[-■ in Figure 4, Figure 4 is a plan layout diagram of the main components in Figure 3, and Figure 5 is a diagram of the resistance detection circuit. An explanatory diagram of the principle showing an example, FIG. 6 is an explanatory diagram showing the relative position of the hollow coil and the tap, and FIG.
FIG. 8 is an explanatory axial cross-sectional view of a third embodiment in which the present invention is applied to punch breakage detection, and FIG. 8 is an explanatory side view showing the entire turret punch press. 1... Turret punch press 11... Tapping device 13... Upper turret 2
3... Striker 27... Striker horizontal movement device 41... Mold mounting hole 43... Punch guide 55...
...Tap holder 63...Hollow coil 65...Resistance detection circuit 67...Punch guide 69...Mold mounting hole 115...Stopper plate h...Constant height p...Punch Processing height t...Tap processing height W...Work agent Patent attorney 3
Hidekazu Yoshikazu Figure 2 Figure 3 (a) (b) (C) WA6 Figure 7 Figure 8

Claims (1)

[Claims] A punch press that performs tapping or punching by installing a tapping device or a punch in a mold mounting hole of a turret, the punch press having a hollow coil at the lower end of the inner periphery of the mold mounting hole or the lower inner periphery of the punch guide. A punch press equipped with a tapping device, characterized in that the punch press is equipped with a detection circuit that detects tap or punch breakage based on a change in resistance value in the hollow coil.