JPS6033834A - Punch and jig for counter sink pressing and working method therewith - Google Patents

Abstract

PURPOSE:To reduce the cost of a punch, jig and working method and to improve appearance and accuracy by specifying the constitution of a counter punch for counter sink pressing. CONSTITUTION:A blank material for worked parts is placed on a die 2. A shank 5 descends and a punch plate 4 and a stripper 6 descend as well. The stripper 6 contacts under pressure with the blank material and in succession a punch 3 projects from the bottom surface of the stripper 6. The material pressed by the shaft part 3C for shaping the bore of the counter sink and a part 3b for shaping the counter sink of the punch 3 is forced into the hole of the die 2 and is further pressed by the part 3b, by which the counter sink is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a punch for counterbore pressing, a jig A, and a counterbore pressing method.

(Background of the invention) The conventional method for forming a counterbore using a press involves punching a pilot hole with a diameter slightly larger than the hole in the finished product using a pilot hole punch, and then shaping it into a counterbore shape using a countershape punch. doing the method. However, with this method, the material pressed by the rough shaping punch may bulge up around the blank or protrude into the prepared hole, and distortion may occur around the blank, resulting in poor appearance and accuracy. There was a problem. In addition, the pilot hole punch has a small diameter and requires at least a length beyond the plate thickness of the workpiece, so it is prone to breakage and the punch must be replaced frequently, resulting in high costs. There was a drawback. In addition, since it requires two steps: punching a pilot hole and shaping it, it also has the disadvantage of high costs.

(Objective of the Invention) An object of the present invention is to provide a punch, a jig, and a method for counterbore pressing, which are excellent in appearance and accuracy, and can significantly reduce costs.

(Example of the invention) Hereinafter, the present invention will be explained with reference to illustrated embodiments.

FIG. 1 shows an example of a counterbore machined by the jig of the present invention. The machined part l shown in FIG. bl respectively.

FIG. 2 shows an embodiment of a press jig for forming a counterbore hole according to the present invention. This embodiment shows a case where only a counterbore hole is machined. A hole 2a is formed in the die 2 to form an inner diameter dφ of the flat portion 1a of the workpiece 1. A punch 3 is disposed above this hole 2a. The punch 3 has a shaft portion 3a for shaping the outside diameter of the outside diameter that is approximately the same size as the outside diameter Dφ of the outside diameter portion 1a, and a tapered shaft portion 3a for shaping the outside diameter portion 1a is provided at the lower end of the shaft portion 3a for shaping the outside diameter of the outside diameter. A shaping portion 3b is formed, and a dull inner diameter shaping shaft portion 3c that forms the inner diameter dφ of the dull portion 1a is formed at the lower end of the dull shaping portion 3b. The upper part of the outer diameter shaping shaft part 3a of the punch 3 is fitted into the punch plate 4, and the head part 3d of the punch 3 is pressed by the shank 5 disposed on the punch plate 4. A stripper 6 is disposed below the punch plate 4, and the stripper IJ collar 6 is slidably inserted into the flat outer diameter shaping shaft portion 3a of the punch 3. and,
In order to support the punch plate 4 and the stripper 6 on the shank 5, a stopper bin 7 having upper and lower heads 7a and 7b is inserted through the shank 5, the punch plate 4, and the stripper 6c. A spring 8 is disposed between the punch plate 4 and the stripper 6, and the spring 8 presses the punch plate 4 against the shank 5, and urges the stripper 6 downward.

Next, the effect will be explained. The die 2 is fixed to a fixed portion of a press device, and the shank 5 is fixed to a movable portion of the press device. Then, the material of the processed part 1 is placed on the die 2, and the device is operated.

As a result, the shank 5 is lowered, and the punch plate 4 and stripper 6 are also lowered by ζ. First, the stripper 6 comes into pressure contact with the material, and then the punch 3 protrudes from the lower surface of the stripper 6. As a result, the material pressed by the flat inner diameter shaping shaft 3C and the flat shaping part 3b of the punch 3 is pushed out into the hole 2a of the die 2, and is further pushed by the flat shaping part 3b to form the workpiece 1 as shown in FIG. 1. A hole like this is formed.

Here, in order to form the flat shape as shown in FIGS. 1(a) and 1(b), the punch 3 is lowered until the lower end of the flat outer diameter shaping portion 3a of the punch 3 is located on the upper surface of the workpiece 1. let

In addition, in the case of Fig. 1 (C1fd), the shaft portion 3 with a flat outer diameter
The lower end of a is lowered by the amount by which the flat portion 1a of the workpiece 1 sinks. For convenience of explanation, we have explained the case of forming counterbore holes of various shapes as shown in FIG. However, in reality, it goes without saying that the dimensions of the punch 3 need to be slightly changed depending on the plate thickness and the shape of the counterbore.

When the shank 5 descends and reaches the bottom dead center as described above,
The shank 5 rises to its original position J. As the shank 5 rises, the punch 3 first rises together with the punch holder 4, and then the stripper 6 rises together via the stopper 7.

In this way, since the flat outer diameter shaping shaft portion 3a of the punch 3 is formed to have approximately the same size as the outer diameter Dφ of the flat portion 1a, the outer periphery of the flat portion 1a is formed by the stripper 6 biased by the spring 8.
Since the material is pressed by the punch 3 and the material pressed by the punch 3 is pushed out into the hole 2a of the die 2, the material pressed by the punch 3 does not bulge up on the outer periphery of the flat portion 1a. In addition, since the inner diameter dφ (and the hole 1b) of the flat portion 1a is molded at the same time as the flat portion 1a, the inner diameter dφ
(and the hole 1b) accuracy is improved, and the inner diameter dφ
The length of the flat inner diameter shaping shaft portion 3C for forming the hole portion 1b (and the hole portion 1b) may be extremely short, and the punch 3 is difficult to break. Also, since the counterbore is formed in one step, it has excellent workability.

FIG. 3 shows another embodiment of the press jig according to the present invention.

This embodiment shows a case where counterbore drilling and outline punching are performed simultaneously. A die IO, in which a hole 10a for forming the inner diameter dφ of the flat portion 1a (see FIG. 1) is formed, is fixed to a die plate 11 with screws 12. A stripper 14 urged upward by a spring 13 is fitted into the die 10 so as to be vertically movable. Punch 15 is punch 3 shown in the jar in Figure 2.
The upper part is fitted into the bunch plate 16. A shank 18 is disposed on the upper part of the punch plate 16 via a backing plate 17, a die plate 19 is disposed on the lower part of the punch plate 16, and the shank 18, backing plate 17, punch plate 16, and die plate 19 are bolt 20 and nut 2
1 and are fixed together. Further, a stripper 22 is fitted into the die plate 19 so as to be able to move up and down, and a spring 23 disposed between the punch plate 16 and the stripper 22 causes the collar 22a of the stripper 22 to be attached to the die plate 1.
It is pressed against the step portion 19a of No.9.

Further, a stripper 224 and a bottle 24 are installed in an extended manner on the upper surface of the backing plate 17.

A knocker plate 25 is disposed within the shank 18 corresponding to the upper end of the bottle 24. A knot carbine 26 is implanted in the knot car plate 25 so as to protrude from the shank 18, and the knot carbine 26 can be moved up and down by a driving means (not shown).

Next, the effect will be explained. When the shank 18 is lowered, the backing plate 17, punch plate 16, die plate 19 and stripper 22 are lowered together. First, the die plate 19 and the stripper 22 come into contact with the workpiece placed on the stripper 14 and the die 10. Subsequently, the die plate 19 and punch 15 protrude from the lower surface of the stripper 22. When the punch 15 protrudes from the lower surface of the stripper 22, the material pressed by the flat inner diameter shaping shaft part 15e and the flat shaping part 15b of the punch 15 is pushed out into the hole 10a of the die 10.

As a result, the workpiece 1 is formed into a counterbore as shown in FIG. 1, as in the case of FIG. 2. In addition, in FIG. 3, 15a indicates the same flat outer diameter shaping shaft portion as 3a in FIG. Further, when the die plate 19 protrudes from the lower surface of the stripper 22, the workpiece is punched into the desired external shape by the action of the inner diameter part of the die plate 19 and the outer diameter part of the die 10.

When the shank 18 descends as described above and reaches the bottom dead center, the shank 18 rises to its original position.

In this case, the processed parts may fit into the inner diameter portion of the die plate 19 and be lifted together. Therefore, when the shank 18 rises, the knot carbine 26 is moved up and down, and the stripper 22 is lowered by the knot car plate 25 via the bin 24. As a result, the processed part is dropped from the die plate 19.

In this way, the counterbore drilling can be performed at the same time as the outline cutting.

In addition, in each of the above embodiments, the case where one counterbore hole is machined has been explained, but it is possible to dispose two or more punches 3 or 15 and machine a plurality of counterbore holes at the same time. Not even.

Further, in this embodiment, the case of machining a circular counterbore hole has been described, but the shape of the counterbore hole is not limited to a circular shape, and may be, for example, a square shape or an elliptical shape.

(Effects of the Invention) As is clear from the above description, according to the present invention, the outer diameter shaping shaft portion of the punch is formed to have approximately the same size as the outer diameter of the filler portion, so that the outer periphery of the filler portion is By being pressed by the stripper biased by the spring and by pushing the material pressed by the punch into the hole of the die, the material pressed by the punch does not bulge up on the outer periphery of the flat portion. Furthermore, since the inner diameter of the flat part is formed at the same time as the flat part, the accuracy of the inner diameter is improved, and the length of the flat inner diameter shaping shaft part for shaping the inner diameter of the flat part can be extremely short, and the punch is difficult to break. Also, since the counterbore is formed in one step, workability is excellent.

[Brief explanation of the drawing]

FIG. 1 fat (bl (C) td) is a cross-sectional view showing an example of the shape of a counterbore, FIG. 2 is a cross-sectional view showing an example of the present invention,
FIG. 3 is a sectional view showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Processed part, 1a... Flat part, 1b... Hole part, 2... Die, 2... Hole, 3... Punch, 3a... Flat outer diameter shaping shaft part, 3b...Flat shaping part, 3C...Flat inner diameter shaping shaft part, 4...Punch plate, 6...S I-IJ collar, 8...Spring, 10.
...Die, 10a... Hole, 15... Punch, 15a... Flat outer diameter shaping shaft,
15b...Flat shaping part, 15e...Flat inner diameter shaping shaft part, 16...Punch plate, 2211. Stripper, 23... spring. Figure 1 (a) (b) (c) (d) Figure 2 Figure 3

Claims (1)

[Scope of Claims] (1) A flat outer diameter shaping shaft portion formed to have an outer diameter approximately equal to the outer diameter portion of the counterbore hole, and a flattening portion of the counterbore hole formed at the lower end of the flat outer diameter shaping shaft portion. 1. A punch for press working of a counterbore hole, comprising a countershape shaping section for shaping the counterbore hole, and a counterbore inner diameter shaping shaft section formed at the lower end of the counterbore shaping section for shaping the inner diameter part of the counterbore hole. (2. A punch for counterbore press processing according to claim 1, wherein the counterbore shaping portion is formed in a tapered shape. (3) A hole that is approximately equal to the inner diameter of the counterbore of the workpiece. a goo having a goo, a punch disposed above the die for shaping the counterbore, a punch plate that holds the punch and moves up and down, and a spring biased punch disposed below the punch plate. and a stripper, the punch comprising:
a flat outer diameter shaping shaft portion formed to have an outer diameter substantially equal to the outer diameter portion of the counterbore hole; a flattening shaping portion formed at the lower end of the flat outer diameter shaping shaft portion to shape the flat portion of the counterbore hole; a counterbore inner diameter shaping shaft portion formed at the lower end of the counterbore shaping portion and cooperating with the hole of the die to shape the inner diameter portion of the counterbore hole;
A jig for counterbore hole pressing, characterized in that the stripper is slidably inserted into the counterbore outer diameter shaping shaft of the punch. (4) The workpiece is held between a goo with a hole approximately equal to the inner diameter of the counterbore of the workpiece and a stripper equipped with a slidable punch, and the workpiece is punched out by vertical movement of the punch. A counterbore hole pressing method, characterized in that an outer diameter portion, a counterbore hole portion, and an inner diameter portion of the counterbore hole are simultaneously shaped.