JPS5832824Y2 - Plastic processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plastic working device, and particularly to a plastic working device suitable for use in plastic working forming the heads of screws and bolts.

For example, when forming the head of a screw with a cross groove as a screw for a Phillips-head screwdriver by plastic working, conventionally one end of a rod-shaped material is held in a die, and the tip of the material protruding from the die is formed into the head. Roughly machine the screw head shape using a cross-groove forming punch (first punch), then use a cross-groove forming punch (
A second punch) is used to finish the head shape and form a cross groove.

By the way, since the second punch has a cross-shaped protrusion for forming the cross groove, it wears more severely than the first punch, and as a result, the second punch needs to be replaced more frequently.

Therefore, it takes a lot of time to replace the second punch, the work is interrupted during that time, and adjustments are required after the replacement, further reducing work efficiency.

In view of this, the present invention has been devised for the purpose of providing a plastic working device that can effectively solve the above-mentioned conventional problems.

Hereinafter, the present invention will be described with reference to embodiments shown in the drawings.

The plastic working device according to the present invention has a machine body 1 that is moved back and forth by a crank mechanism (not shown) like a general press machine, as shown in the front view in Fig. 1 and in the longitudinal side view in Fig. 2. A first punch holder 4 that holds a first punch 3 and a plurality of second punches 5, 5, . A second punch holder 6 is provided.

The base 2 has a vertically elongated shape and is attached to the machine body 1 with its position determined by the axis γ located at the center of the second punch holder 6, and the insertion hole for the bolt 8 that fixes the upper part is formed by the insertion hole of the bolt 8. The tips of adjustment bolts 9, 9, which are formed to have a slightly larger diameter than the shaft portion and are screwed from both sides of the base 2 toward the axis of the bolt 8, are in contact with the side surfaces of the shaft portion of the bolt 8. The upper part of the base 2 can be finely adjusted left and right about the axis T by tightening and loosening the adjusting bolts 9, 9.

The first punch holder 4 is attached to the front surface of the base 2 by four fixing bolts 10, 10, . It is screwed toward the axis of the first punch 3, and its inner end is in contact with the side surface of the first punch 3, and the above adjustment is made after loosening the four fixing bolts 10, 10... By tightening and loosening the bolts 11 and 11, the first punch 3 and the first punch holder 4 can be finely adjusted in the left and right direction.

The first punch 3 has a die 13 at its tip for roughly processing the end of the material 12 into a head shape, and is prevented from coming out by a ball 14 inserted between it and the inner peripheral surface of the first punch holder 4. It is prevented from rotating and is placed in a state where it protrudes from the back by a spring 15 as shown in the second figure.

The second punch holder 6 has a through hole 16 in its axis, and a sleeve 17 is fitted into the through hole 16 on the base 2 side.
are fitted to form a center of rotation, and the head 7a of the shaft 7 is placed within this sleeve 17.

The outer circumference of the second punch holder 6 has a cylindrical shape, and an annular groove 18 is formed on this circumferential surface. The holding claws 20a, 20a at the tips are engaged to bring the inner end surface of the holder 6 into contact with the pressure receiving surface 21 of the base 2.

On the other hand, on the front surface of the second punch holder 6, there are second punch holding holes 22, 22, . The buttons are arranged in a ring shape at equal intervals around the axis 7.

Further, on the circumferential surface of the second punch holder 6, there are positioning recesses 2 corresponding to the second punch holding holes 22, 22...
3, 23... are formed, and these recesses 23, 23
... is engaged with the tip of a positioning push screw 24 screwed into the side surface of the base 2, and the four second punches 5
, 5... can be correctly positioned and fixed at the processing position.

The second punch 5 has the first punch 3 on its tip surface.
A raw material 12 roughly processed into the shape of a screw head using a mold 13 of
A mold 26 is formed which has a cross-shaped protrusion 25 for processing into a predetermined precision shape and forming a cross groove.

Since the present invention has the above-mentioned configuration, the second punches 5, 5 are inserted into each of the second punch holding holes 22, 22... of the second punch holder 6.
... is inserted, and by pressing the tip of the positioning push screw 24 into the positioning recess 23 of the holder 6, one second punch 5 is positioned at a predetermined processing position.

As a result, the second punch 5 and the first punch 3 are positioned on the base 2, but if the position of the second punch 5 is
If the material 12 held by the base 7 is biased to the left or right, loosen one of the adjustment bolts 9 screwed into the base 2 and tighten the other to center the base 2 around the shaft 7. You can adjust the position accurately by slightly rotating left and right.

If it becomes necessary to correct the position of the first punch 3 with respect to the second punch 5 adjusted as described above,
Four fixing bolts 10, 10 of punch holder 4...
, then adjust the right or left adjustment pole N1. ．． By loosening one of the punches 11 and tightening the other, the entire first punch holder 4 can be finely adjusted to the right or left, thereby allowing the first punch 3 and the second punch 5 to be set at correct positions.

After setting each punch in this way, the machine body 1 is moved forward by a crank mechanism (not shown), the rough shape of the screw head is formed on the tip of the material 12 by the first punch 3, and then the second punch 5 is moved by the cam mechanism after retreating. The axis of the material 12 is raised to a position that coincides with the axis of the material 12 and moved forward, and the tip of the material 12 is precisely machined into the shape of a screw head, and the cross-shaped protrusion 25 is
to form a cross groove.

After repeating the above processing, the cross-shaped protrusion 2 of the second punch 5
5 is worn out, the second punch holder 6 is released from the fixed state by loosening the positioning push screw 24A and the press holders 20, 20, and the second punch holder 6 is rotated to attach the next punch holder. 2 position the punch 5 at the processing position, then press the press holder 20.20 and the positioning push screw 2.
It is fixed again by tightening 4.

In this case, the correct position is achieved by fitting the tip of the positioning push screw 24 into the recess 23.

Therefore, in the illustrated embodiment, the second punches 5, 5
. . . can be replaced and used up to four times while always maintaining the correct position by simply tightening and loosening the press holder 20, 20 and the positioning push screw 24.

In addition, if all the second punches 5, 5... are no longer usable, remove the second punch holder 6 and replace each second punch 5, 5... with a new one and reinstall it. Bye.

Note that the second punches 5, 5 and 5 held in the second punch holder 6
...The number is not limited to four.

As explained above, according to the present invention, there is no need to replace punches that are severely worn out each time, so the replacement work can be done extremely quickly, and there is no need to align each time each replacement. The time and effort required can be significantly reduced.

Further, as in this embodiment, since the first punch holder and the second punch holder can be configured to be adjusted separately, it is possible to easily align the first punch and the second punch. , the time required for the adjustment can be significantly shortened.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the plastic working device according to the present invention, Fig. 2 is a longitudinal sectional side view of the same, and Fig. 3 is the same as Fig. 1 rn-m.
It is a line diagram. 1... Aircraft, 2... Pace, 3... First punch,
4... first punch holder, 5... second punch, 6...
...Second punch holder, 7...shaft, 8...bolt,
9,9,11゜11...adjustment bolt, 10...fixing bolt, 12...material, 13,26...model, 17
... Sleeve, 18 ... Annular groove, 20 ... Suppression holding body, 21 ... Pressure receiving surface, 22 ... Second punch holding hole, 23 ... Recessed part for positioning, 24 ... Positioning Push screw, 25...Cross-shaped protrusion.

Claims (1)

[Scope of utility model registration request] A first holding a first punch on a base attached to the machine body.
a punch holder; and a second punch holder having a cylindrical shape that holds a plurality of second punches in an annular arrangement at regular intervals and is rotatably supported, the second punch holder having an annular groove on a peripheral surface, A holding claw of a press holder fixed to the machine body is engaged with this annular groove to bring the rear surface of the holder into contact with the pressure receiving surface, and a second punch holder is provided on the circumferential surface of the second punch holder.
The tip of a positioning push screw screwed into the base is reliably disposed in a positioning recess formed corresponding to each second punch holding part so that the punch is correctly placed at the processing position, A plastic processing device in which the machine body is configured to have a first punch and one second punch whose positions are variable so as to match the axis of a material held by a die.