JPH0221130Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stamping punch provided on the upper or lower die of a press die in order to stamp identification on a steel plate during a press process.

In the press process, for example, there are cases where symmetrical parts with the exact same shape are pressed, and in such cases, it is necessary to ensure that the press products are managed correctly during the press process and subsequent processes.
It is necessary to attach some sort of code to the pressed product. As a method of attaching this code, there is a method of marking with paint, ink, etc., but with such a method, there is a risk that it will disappear or a writing error will occur, and furthermore, it takes a lot of man-hours. Therefore, conventionally, a stamping punch was incorporated into the press die.
At the same time as pressing, a code was stamped on the pressed product. In order to incorporate this engraving punch into a press die, consideration must be given to tightening and preventing rotation.For this reason, conventionally, the engraving punch is temporarily attached to the press die via a retainer, and then two bolts are attached. I used two dowel pins to fully tighten it. However, mounting via a retainer increases the number of parts and requires a large mounting space.

In addition, there are cases where the stamping punch is attached directly to the press die without using a retainer, but in that case,
Since the engraving punch is directly attached to the die using two bolts and two dowel pins, there is a problem in that the engraving punch body becomes very large.

The present invention aims to solve the above-mentioned problems, and provides a stamping punch that requires fewer parts for installation, provides a strong installation, requires less installation space, and is inexpensive. be.

And this purpose has a columnar shape with a circular cross section,
The stamping punch has one screw hole in the eccentric part of the rear end, and is fitted into a mounting hole provided in the press mold, and is tightened and fixed to the press mold with a bolt screwed into the screw hole. configured.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

Figures 1 to 3 are diagrams showing the structure of the stamping punch of the present invention, with Figure 1 being a plan view showing the stamping surface, Figure 2 being a sectional view of Figure 1, and Figure 3 showing the back side. FIG.

The stamping punch indicated by 1 has a columnar shape with a circular cross section, and has a character 2 protruding from its tip. This character 2 has an inverted "R" drawn on it so that "R" is engraved on the stamped press part, for example, as a right identification symbol in the case where there are two left and right parts.

Further, an eccentric screw hole 3 for attaching a press mold, which will be described later, is provided at the rear end. The axis 3' of this screw hole 3 is set at a position separated from the axis 1' of the marking punch 1 by an appropriate distance h.

Next, an example of attaching the marking punch 1 having the above structure to the upper die will be explained using FIG. 4. Here upper mold 4
is provided with a mounting hole 4a for storing a cylindrical punch. The mounting hole 4a is formed to a depth such that the character 2 slightly protrudes from the lower surface of the upper mold 4 when the marking punch 1 is inserted from the rear end.

Further, above the attachment hole 4a of the upper die 4, a bolt through hole 4b is provided, the axis of which is spaced a distance h from the axis of the attachment hole 4a.

Further, above the bolt through hole 4b, there is a hole 4 of an appropriate size and depth into which the head of the bolt, which will be described later, can be inserted.
c is provided.

Now, when attaching the engraving punch 1 to the above-mentioned upper die 4, the engraving punch 1 is first fitted into the attachment hole 4a from the rear end. After that, the bolt through hole 4b is passed through the hole 4c and the screw hole 3 of the marking punch 1 is aligned. Then, by tightening the marking punch 1 with the bolt 6 through the washer 5 through the hole 4c, the setting to the upper mold 4 is completed.

The stamping punch 1 attached in this way descends together with the upper mold, is pressed against the steel plate 7 placed on the lower mold (not shown), and at the same time the stamped product is formed.
The font 2 will be engraved on the pressed product.

At this time, the stamping punch 1 is inserted at a distance h in the mounting hole 4a in which the side surface of the stamping punch 1 is accommodated without a gap.
Since it is tightened by a bolt 6 that is screwed into a screw hole 3 that is eccentric, it has a locking effect and does not rotate.

Note that the stamping punch 1 may be attached not only to the upper mold as in this embodiment but also to the lower mold.

Furthermore, it goes without saying that it is not limited to the one for picking up two pieces.

Also, if the type uses a pad, it may be attached to the pad.

As described above, according to the present invention, only one bolt can achieve the tightening effect, loosening prevention effect, and rotation prevention effect, and there is no need to use a retainer as in the past, and the number of parts can be greatly reduced. did. Furthermore, by reducing the number of parts, the installation space can be reduced, and the system can be used at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the stamping surface of the stamping punch according to the present invention, FIG. 2 is a cross-sectional view taken from FIG. 1, FIG. 3 is a plan view showing the back side of the stamping punch, and FIG. It is a sectional view showing an example of how to attach a punch. 1... Engraving punch, 1'... Engraving punch axis center,
3...Screw hole, 3'...Bolt hole axis.

Claims (1)

[Scope of utility model registration request] This is a stamping punch that is incorporated into a press mold and stamps a code on the pressed product at the same time as the press processing.It has a columnar shape with a circular cross section, has one screw hole at the eccentric part of the rear end, and is provided in the press mold. A stamping punch that is fitted into a mounting hole and is tightened and fixed to a press die by a bolt screwed into the screw hole.