JP2871416B2 - Press bottoming marker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottoming marker for a press, which is used to stamp a workpiece on a press for confirming the molding.

[0002]

2. Description of the Related Art Conventionally, as this type of bottoming marker, for example, there has been one shown in FIG. The illustrated bottoming marker 100 has an annular engraving projection 101a.
And a rod-shaped marker member 101 having the same annular engraving projection 102a
And a threaded mounting hole 104 formed in the upper die 103.
It is accommodated inside, is fitted on the outside of the annular marker 102 member, and is fixed by a fixing ring 105 screwed into the mounting hole 104.

The bottoming marker 100 has a protrusion amount h1 of a protrusion 101a of an inner rod-shaped marker member 101.
Is larger than the protrusion amount h2 of the protrusion 102a of the outer annular marker member 102. At the same time when the work W is press-formed with the lower mold 106, each protrusion 101
A double circle is engraved on the work W in a and 102a.

At this time, the inner marking is for setting the quality range of the product shape, and the outer marking is for setting the range of the appearance quality. When the outer mark disappears, it is determined that the adjustment is incomplete. As a result, adjustment of the bottom dead center position of the upper die and the like are performed.

[0005] A bottoming marker of such a press is described in, for example, Japanese Utility Model Application Laid-Open No. 62-113834.

[0006]

However, in the above-mentioned conventional bottoming marker of the press, it is possible to judge that the driving amount of the upper die is insufficient due to the absence of the outer engraving. It was extremely difficult to judge overrunning, and it was necessary to rely on the experience of workers. Further, when molding another work having a different quality range, it is necessary to prepare another bottoming marker having different projection amounts of the inner and outer projections, and furthermore, since it is constituted by two marker members. However, there is a problem that the labor and cost for manufacturing are increased, and solving these problems has been a problem.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems. A bottoming marker for a press which can easily determine whether the upper die is underrunning or overrunning is provided. The main purpose is to provide, support for multiple types of work with different quality ranges,
It is an object of the present invention to provide a press bottoming marker which can save labor and cost in manufacturing.

[0008]

A bottoming marker for a press according to the present invention is a bottoming marker attached to a press die for marking a workpiece, wherein at least three linear stamping ridges having different projection amounts from each other. The configuration is provided, and the above configuration is used as means for solving the conventional problem.

[0009]

According to the bottoming marker of the press according to the present invention, the quality range of the product shape is set by, for example, marking with the largest one of the at least three marking ridges. Also, the range of appearance quality (unevenness, wrinkles, etc.) is set by engraving with a smaller ridge.
The state where the book is engraved is regarded as a good quality range. Therefore, when the second engraved mark has disappeared, it is determined that the amount of overrun of the upper mold is insufficient, and when the third engraved mark appears, it can be determined that the overmold is overrun. .

If three or more ridges for engraving are provided, different quality ranges can be dealt with depending on the combination of any two ridges. It is easy to form all the ridges on the marker.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

That is, the bottoming marker 1 shown in FIG. 1 is mainly composed of a columnar marker member, and has a substantially semicircular keyway 2 extending from one end surface thereof in a predetermined length in the axial direction. At the same time, six linear stamping ridges T1 to T6 are formed on the same end face at predetermined intervals. Each of the ridges T1 to T6 has a trapezoidal cross-sectional shape, and the protrusion amounts H1 to H6 increase in order from the left side in FIG.

FIG. 2 is a view showing a part of a drawing die. The drawing die includes an upper punch 11, a lower die 12,
The die face 12 of the die 12 precedes the punch 11
a blank holder 13 for pressing and holding the workpiece W between
, Especially the pressing force of the upper punch (falling amount)
The bottoming marker 1 is incorporated in the tip of the punch 11 in order to manage the condition. Bottoming marker 1
Although not shown, is fixed by a key and bolts fitted into the key groove 2.

Here, for example, the case where the quality range of the workpiece W is set by the sixth ridge T6 and the fourth ridge T4 whose projection amount is two steps smaller than this will be described. As shown in FIG. 3, the workpiece W has fourth to sixth ridges T
The driving amount of the upper die (the sliding descending amount) is adjusted so that the marks M4 to M6 by 4 to T6 are obtained. At this time, the sixth mark M6 sets the quality range of the quality shape, and the fourth mark M4 sets the appearance quality (unevenness, wrinkles, etc.).
This is for setting the range.

Therefore, when three stamps M4 to M6 appear when the press is performed, the quality is within the good quality range, and when the fourth stamp M4 has disappeared, the driving amount of the upper mold is insufficient. When the third ridge T3 with a smaller amount of protrusion appears, it can be determined that the upper die is overrunning, thereby adjusting the bottom dead center position of the upper die. Should be performed.

The above-mentioned bottoming marker 1 determines the above-mentioned judgment by a combination of the sixth ridge T6 having the largest amount of protrusion and any one of the fifth to second ridges T5 to T2. While making it possible, it is possible to cope with other works having different quality ranges by the combination, and moreover, forming a plurality of linear ridges on the end face of the columnar member,
It is relatively easy to mold with a machine tool or the like.

FIGS. 4 and 5 illustrate another embodiment of the present invention. This embodiment shows a case in which the above-mentioned bottoming marker 1 is used to manage the pressing force (amount of descent) of the upper blank holder in the drawing die.

The illustrated die includes an upper punch 21, a lower die 22, and a blank holder 23 for pressing and holding the work W between the die 21 and a die face 22a of the die 22 prior to the punch 21. The distance pieces 24 for receiving the lowered blank holders 23 are provided at eight locations at predetermined intervals on the outer peripheral side of the die face 22a.

Four of the eight distance pieces 24 are partially cut away on the die face 22a side, and the cut portions are received with the upper surface at the same height as the die face 22a. Block 25 is incorporated.
On the other hand, the bottoming marker 1 is provided on the blank holder 23 so as to face each receiving block 25.

In the above-described drawing die, a test piece 30 made of the same material as the work W is placed on the receiving block 25, and the test work 30 is stamped with the bottoming marker 1 while the work W is pressed. Thereby, it is determined whether the pressing force of the blank holder 23 is appropriate.

In order to control the pressing force of the blank holder, for example, the slide descending amount is adjusted based on the reading of a die height counter in a press machine. However, a drive mechanism of the press machine is configured. Since errors may occur due to gear backlash or the like, it is necessary to actually perform pressing to check the pressing force. In addition, when a bottoming marker is provided on a portion of the blank holder facing the die face, and the outer peripheral portion of the work is to be engraved, the outer peripheral portion of the work is pulled toward the punch side when narrowing down.
The engraved mark will be rubbed, and a preferable criterion for determining the pressing force cannot be obtained.

Therefore, as described in the above embodiment,
A receiving block 25 is arranged on the outer peripheral side of the die face 22a, and the test piece 30 placed on the receiving block 25
In this case, the pressing force of the blank holder at the time of actual press working can be easily determined without worrying that the stamp will be rubbed.

[0023]

As described above, according to the bottoming marker of the press of the present invention, in order to detect mold wear early and prevent the mold from being damaged, the upper mold has to be driven by an insufficient amount or an excessive amount of overdrive. Can be easily determined, and it is possible to easily deal with a plurality of types of workpieces having different quality ranges by itself, and it is possible to easily and inexpensively manufacture the marker itself. There is.

[Brief description of the drawings]

FIG. 1 is a front view (a) illustrating a bottoming marker according to an embodiment of the present invention, a side view (b) of a partially enlarged front part, and a cross-sectional view (c).

FIG. 2 is a cross-sectional view illustrating an aperture type incorporating a bottoming marker.

FIG. 3 is a plan view showing engravings by fourth to sixth ridges.

FIG. 4 is a plan view of a drawing die according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view of the aperture die taken along a line AA in FIG. 4;

FIG. 6 is a cross-sectional view illustrating a conventional bottoming marker.

[Explanation of symbols]

 1 Bottoming marker T1 to T6 Rim for engraving W Work

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B30B 15/00 B21C 51/00 B21D 22/02 B41K 3/36

Claims (1)

(57) [Claims] 1. A bottoming marker for a press, wherein the bottoming marker is attached to a press die and stamps a workpiece, wherein at least three linear stamping ridges having mutually different protrusion amounts are provided.