JPH0133247Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a stripper plate holding mechanism in a press die, and in particular, it is an improvement to facilitate the reassembly of the stripper plate when regrinding the punch blade. It is related to.

Conventionally, as a stripper plate holding mechanism in a press mold, a mechanism as shown in FIGS. 1 to 3 has been frequently used.

In the figure, a punch 3 is vertically installed on the lower surface of a punch holder 1 via a punch plate 2, and a plurality of stripper bolts 5 extending from the holder 1 are attached to the bottom of the punch holder 1. The stripper plate 4 is held horizontally at an appropriate distance from the stripper plate 4. That is,
The lower screw 5a of the stripper bolt 5 is screwed into the stripper plate 4, and the head 5b of the bolt 5 is inserted and engaged into the recess 6 of the punch holder 1, so that the stripper plate 4 is attached to the punch holder 1. It is held hanging in a parallel position. A spring 7 is attached around the stripper bolt 5.
is screwed in, and always urges the punch holder 1 and stripper plate 4 in the opening direction in a horizontal position.

On the other hand, a die holder 8 and a die block 9 are installed further below the stripper plate 4, and a stock 10, which is a workpiece, is placed on the die block 9.

Then, the punch 3 is attached to a stripper plate 4.
As shown in the enlarged view of FIG. 3, when the punch holder 1 is not working (the punch holder 1 is raised to the top dead center) The maximum distance L between the punch holder 1 and the stripper plate 4 is set so that the lower surface of the punch 3 is recessed more than the lower surface of the stripper plate 4. And punch 3
The recess amount S must be sufficient to escape the burrs formed on the stock 10 during the punching process, and the adjustment of the distance L for this purpose is necessary to reduce the distance between the head 5b of the stripper bolt 5 and the bottom of the recess 6. This is done by changing the thickness of the compensator 11 interposed therein.

During the punching process, the punch holder 1 is lowered, and the stripper plate 4 first contacts the entire surface of the stock 10 on the die block 9 and presses it down with an average force. Further, when the punch holder 1 is lowered, the punch holder 1 compresses the spring 7 and narrows the distance L between the punch holder 1 and the stripper plate 4, causing the punch 3 to protrude below the stripper plate 4 and strike the stock 10. Pull it out. After punching, the punch holder 1 is raised and the punch 3 and stock 1 are removed.
When pulling out from 0, the stripper plate 4 is urged by the spring 7 during this time, and the stripper plate 4
Since the stock 10 is pressed onto the die block 9 together with the punch 3, the stock 10 does not follow the rise of the punch 3, and the stock 10, which is pulled out and squeezed from the punch 3, remains on the die block 9. It remains in place.

By the way, in such a punch press, generally,
After a certain number of punching operations have been performed, it is necessary to re-grind the blade of the punch 3. For this re-grinding process, remove the stripper bolt 5 and then remove the stripper plate 4 before turning the punch. It is preferable for the process to be carried out after the holder 1, punch plate 2, and punch 3 are turned over integrally so that the blade of the punch 3 faces upward.

After the re-grinding process, the stripper plate 4
At this time, the plurality of stripper bolts 5 must be tightened against the biasing force of the spring 7. During the tightening operation of the stripper bolts 5, the stripper plate 4 It is extremely difficult to maintain parallelism to the punch holder 1, resulting in poor workability.

Moreover, when the above-mentioned parallelism is not maintained, there is also the problem that the punch 3 comes into abrasive sliding contact with the passage hole 4a of the stripper plate 4, causing scratches on the punch 3 or the passage hole 4a.

Therefore, a structure shown in FIG. 4 has been proposed to solve the problems of the conventional example.
That is, without arranging a spring around the stripper bolt 5, the spring insertion hole 1 is inserted into the punch holder 1.
2, insert the spring 13 here, and insert the insertion hole 1.
Screw the screw plug 14 into the top of 2,
The spring 13 is pressed down.

With this configuration, the spring 13 can be inserted into the spring insertion hole 12 after the stripper plate 4 is assembled with the stripper bolt 5. There is no biasing force, which makes assembly work extremely easy.

However, with the above configuration, extra space is required for arranging the spring 13, so the entire device cannot be made compact.Furthermore, since the spring insertion hole 12 is formed, the strength of the punch holder 1 is reduced. It had the disadvantage of being insufficient.

In addition, in any of the above conventional techniques, in order to keep the recess amount S of the punch 3 from the stripper plate 4 constant when re-grinding the punch 3, the thickness of the compensator 11 must be adjusted to the amount of grinding of the blade. Adjustments must be made to increase the amount accordingly, and the compensator 11 must be replaced or additionally inserted, making adjustment work and compensator management quite complicated.

Moreover, when the production of the apparatus is completed, the distance L between the punch holder 1 and the stripper plate 4 is fixed by the stripper bolt 5 and the compensator 11.

The purpose of this invention was to solve problems such as the difficulty of assembling the stripper plate due to the structural limitations of the stripper plate holding mechanism in the punch press based on the conventional technology. The above-mentioned drawbacks and difficulties have been eliminated by having a structure in which a spring holder that is removably fixed to the stripper plate is slidably fitted, and the pin of the pin rod is inserted into the elongated hole of the spring holder. Therefore, it is an object of the present invention to provide an excellent stripper plate holding mechanism that allows the stripper plate to be assembled very smoothly without sacrificing the compactness of the structure or the strength of the punch holder.

The structure of this invention in accordance with the above object is such that the passage hole 4a of the stripper plate 4, which is held parallel to the punch holder 1 at a distance and is always biased by a spring in the opening direction, is placed below the punch holder 1. In a stripper plate holding mechanism in a press mold through which a punch 3 vertically installed can be freely penetrated and lowered, a loading nut 18 is screwed onto the upper end of a pin rod 16, and a loading nut 18 is screwed onto the lower end of the rod 16. A pin 17 protruding in a radial direction with respect to the longitudinal axis is implanted, and the pin is slidable up and down in a long hole 20 bored through the cylindrical portion 19 of the spring holder 19 along the longitudinal axis. The punch holder 1 and the stripper plate 4 are fitted into the center in a non-rotatable manner, and a spring 23 is compressed and interposed between the flange portion 19b of the holder 19 and the loading nut 18 to form an integral unit. When assembling, insert the screw at the upper end of the pin rod 16 into the screw hole 1 of the punch holder 1.
5, and rotate the entire unit directly by hand until the upper surface of the loading nut 18 comes into contact with the lower surface of the punch holder 1 and is regulated. Then, attach a compensator to the lower surface of the flange portion 19b at the bottom of the unit. 21 and the flange portion 19b is tightened with the set screw 22 together with the compensator 21, and screwed onto the stripper plate 4. On the other hand, when disassembling the punch holder 1 and the stripper plate 4, the unit is When the screws on the bottom stripper plate 4 are unscrewed, and then the unit is manually reversely rotated and the screws on the punch holder 1 are unscrewed, the unit including the spring 23 is released. The unit straightens and separates from the punch holder 1 and stripper plate 4, and then the setscrew 22 for screwing onto the stripper plate 4 is screwed into the bottom of the removed unit, and if necessary, The compensator 21 is fastened together with the screw 22 at the bottom of the unit, so that the entire unit can be handled as one unit.

Next, an embodiment of this invention will be described below based on FIGS. 5 and 6.

In the figure, the punch holder 1 has a screw hole 15 threaded on its lower surface, into which the upper end of a pin rod 16 is screwed. A loading nut 18 is screwed onto the upper end of the pin rod 16, and the screwing amount of the pin rod 16 into the punch holder 1 is determined by the screwing position. That is, when the pin rod 16 is screwed into the punch holder 1, the upper surface of the loading nut 18 screwed onto the appropriate position on the pin rod 16 is screwed in until it is regulated by contacting the lower surface of the punch plate 2. The amount of screw-in is determined.

On the other hand, a pin 17 is implanted at the lower end of the pin rod 16 and projects in a radial direction with respect to the longitudinal axis of the pin 16.

A cylindrical spring holder 19 is slidably fitted into the pin rod 16, and a long hole 20 extending in the longitudinal axis direction of the holder 19 is formed in the cylindrical portion 19a of the spring holder 19. A pin 17 is drilled through the elongated hole 20 and is implanted in the pin rod 16. The pin 17 is inserted into the elongated hole 20 so as to be slidable up and down relative to the elongated hole 20, but not to rotate relative to the elongated hole 20. The spring holder 19 is removably fixed to the stripper plate 4 by a set screw 22 with an annular compensator 21 interposed therebetween. The head of the set screw 22 is screwed into the stripper plate 4 so that it is buried therein.

A flange portion 19b is connected to the lower end of the cylindrical portion 19a of the spring holder 19, and between the flange portion 19b and the loading nut 18,
A spring 23 is compressed and inserted into the punch holder 1.
The stripper plate 4 is kept in a horizontal position and is always biased by a spring in the opening direction. Therefore, although the spring holder 19 is pushed downward by the spring 23, the pin 17 of the pin rod 16 comes into contact with the upper end of the elongated hole 20, and further downward movement is restricted.

In this configuration, the loading nut 18 on the pin rod 16 is tightened against the spring holder 19, and the loading nut 18 shown in FIG.
The total length l from the upper surface of the spring holder 8 to the lower surface of the flange portion 19b of the spring holder 19 is regulated to a predetermined dimension.

Of course, at this time, the spring 23 is compressed and has a predetermined preload. In this case, the pin rod 16 holds the punch holder 1 until the loading nut 18 comes into contact with the punch holder 1.
As mentioned above, it is screwed into the

In this way, the pin rod 16 and the spring holder 19, including the spring 23 which is compressed and interposed between the flange portion 19b of the spring holder 19 and the loading nut 18, are connected so that they can move up and down relative to each other but cannot rotate relative to each other. , forming an integral unit. A compensator 21 is interposed on the lower surface of the flange portion 19b of this unit, and the flange portion 1
9b is screwed onto the stripper plate 4, while the upper end of the pin rod 16 of the unit is screwed onto the punch holder 1, and the upper surface of the loading nut 18 is brought into contact with the lower surface of the holder 1. This results in
By removably fixing the unit between the stripper plate 4 and the punch holder 1, the maximum distance L between the punch holder 1 and the stripper plate 4 is determined. When the distance L is determined, the amount S of the punch 3 retracted from the stripper plate 4 as shown in FIG. 3 is also determined.

During the punching process, the stripper plate 4 comes into contact with the stock 10 and presses it against the die block 9.
The punching process is performed by pressing upwardly with the compressive force of the spring 23, and further by lowering the punch holder 1, the pin 17 of the pin rod 16 slides downward within the elongated hole 20 of the spring holder 19. be.

When removing the stripper plate 4 for re-grinding the punch 3, the set screw 22
is removed from the spring holder 19 and the stripper plate 4 is removed. At this time, the upper edge of the elongated hole 20 of the spring holder 19 comes into contact with the pin 17 of the pin rod 16, so that the spring holder 19 will not fall out.

In order to keep the recess amount S of the punch 3 from the stripper plate 4 at a constant value after the re-grinding process, the compensator 21 may be ground by the same amount as the amount of grinding of the punch 3.

In addition, when reassembling the stripper plate 4, the stripper plate 4 is attached to the setscrew 22.
The spring holder 19 may be screwed to the spring holder 19 by the screws, and at this time, the biasing force of the spring 23 does not act on the stripper plate 4.

As described above, according to this invention, the pin rod 1
Screw the loading nut 18 onto the upper end of the
A pin 17 protruding radially from the longitudinal axis of the rod 16 is installed at the lower end of the rod 16, and the pin is inserted into a long hole 20 bored through the cylindrical portion 19a of the spring holder 19 along the longitudinal axis. Punch holder 1 When attaching and detaching the stripper plate 4 and the stripper plate 4, it is necessary to further disassemble the above-mentioned integral unit into its component parts,
There is no need to assemble disassembled parts,
Since the spring 23 can be handled as a unit at all times, the installation and removal work, as well as the assembly work of the stripper plate 4, are not only greatly facilitated, but also the storage of parts, especially storage, transportation, and delivery in distribution channels. This has the excellent effect of greatly improving convenience.

In particular, since the biasing force of the spring 23 does not act on the stripper plate 4 during the assembly work of the stripper plate 4, the stripper plate 4 is kept parallel to the punch holder 1 during the assembly work. By maintaining this posture, there is also the advantage that it is possible to prevent the punch 3 from coming into contact with the passage hole 4a, and as a result, the above-mentioned effect can be achieved in that the work can be carried out smoothly without requiring much skill. This will be further encouraged.

Further, according to this invention, by fitting the pin 17 implanted in the pin rod 16 into the elongated hole 20 bored through the cylindrical portion 19a of the spring holder 19, the pin rod 16 and the spring holder 1 can be connected.
Although the pin rods 16 and 9 are configured to be able to move vertically relative to each other, they cannot rotate relative to each other.
Loading nut 18, spring holder 1
9. Place the unit consisting of the spring 23 into the punch holder 1.
By transmitting the manual rotational movement of the spring holder 19 to the pin rod 16, the pin rod 16 can be screwed into and removed from the punch holder 1 directly by hand. Another advantageous effect is that no special tools are required.

In addition, the unit includes a pin rod 16 having a loading nut 18 screwed onto its upper end, and the upper end of the rod 16 is threaded into a screw hole 15 screwed into the punch holder 1.
By screwing into the pin rod 16, the upper surface of the nut 18 is restricted to abut against the lower surface of the punch holder 1, thereby positioning the loading nut 18 at an appropriate position within the range of the screw threaded on the upper end of the pin rod 16. Since the position of the contact restriction between the upper surface of the nut 18 and the lower surface of the punch holder 1 can be adjusted, the distance L between the punch holder 1 and the stripper plate 4 can be greatly and continuously maintained without changing the pin rod 16. It also has the excellent effect of being adjustable.

[Brief explanation of drawings]

Figures 1 to 4 relate to conventional examples,
1 is a side view of the first embodiment, FIG. 2 is a back view of the punch holder, FIG. 3 is a partially enlarged view, and FIG. 4 is a partially enlarged view of another embodiment. 5 and 6 relate to an embodiment of this invention, FIG. 5 is a sectional view thereof, and FIG. 6 is a partially exploded perspective view. 1... Punch holder, 3... Punch, 4... Stripper plate, 16... Pin rod, 17...
...Pin, 18...Loading nut, 19...
Spring holder, 20... Long hole, 21... Compensator, 22... Set screw, 23... Spring.

Claims (1)

[Claims for Utility Model Registration] Punch holder 1 with punch 3 hanging down on the bottom surface
and a stripper plate 4 which is held horizontally at a distance from the punch holder and is always biased by a spring in the opening direction, so that the punch 3 can freely move in and out of the passage hole 4a of the stripper plate 4. In a stripper plate holding mechanism in a press mold that is arranged to be able to be penetrated and lowered, a loading nut 18 is screwed to the upper end.
A pin rod 16 in which a pin 17 protruding in a radial direction with respect to its longitudinal axis is implanted at the lower end thereof, and a cylindrical portion 19a in which a long hole 20 into which the pin 17 of the pin rod 16 is fitted so as to be vertically slidable is bored through the pin rod 16. a spring holder 19 having a flange portion 19b connected to the lower end of the cylinder; a spring 23 compressed and interposed between the flange portion 19b of the spring holder 19 and the loading nut 18; and a spring holder 19 are connected to each other so that they can move up and down relative to each other but cannot rotate relative to each other to form an integrated unit. The upper surface of the loading nut 18 is fixed to the lower surface of the holder 1 in a removable manner, and a compensator 21 is interposed on the lower surface of the flange portion 19b of the spring holder 19 of the unit. 19b is screwed onto the stripper plate 4, and the unit is detachably fixed to the plate 4, thereby providing a stripper plate holding mechanism in a press mold.