JPH026034A - Method for forming projecting section - Google Patents

Abstract

PURPOSE:To easily form projecting sections having prescribed shapes even when the front end sections of the projecting sections are formed in nonrestricted states by forming punch-side projecting sections to a punch at positions deviated from the positions facing recessed sections of a die. CONSTITUTION:When a doughnut-like plate material 31 provided with a through hole 39 at the center is put between a punch 35 and die 37 arranged in a faced state and the facing surface of the punch 35 is pressed against the facing surface of the die 37, parts of the material 31 plastically flow into recessed sections 41 formed in the facing surface of the die 37 and projecting sections 33 having prescribed shapes are formed on the material 31. In this projecting section forming method, punch-side projecting sections 43 are formed on the facing surface of the punch 35 at positions deviated by the prescribed distance L from the positions of the punch 35 facing the recessed sections 41 of the die 37 so that the sections 43 can cause the material 31 to plastically flow in the directions parallel and perpendicular to the surface of the material 31 and the projecting sections 33 having prescribed shapes are formed on the material 31.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention forms convex portions on a plate material by plastic working [Prior art] Figs. This shows an example of a method for forming a convex portion to form a convex portion 13 of a relatively small size. By pressing the opposing surface against the opposing surface of the die 17, the plate material 1 is inserted into the recess 19 formed on the opposing surface of the die 17.
1 is plastically flowed, and a predetermined shaped convex portion 1 is formed on the plate material 11.
3 is formed.

FIGS. 11 and 12 show another example of a method for forming a convex portion. In this method, on the opposing surface of the punch 15,
A punch-side convex portion 21 having the same shape as the concave portion 19 is formed at a position corresponding to the concave portion 19 formed on the opposing surface of the die 17, and by pressing this punch-side convex portion 21 against the plate material 11, a predetermined shape is formed on the plate material 11. A shaped convex portion 13 is formed.

(Problems to be Solved by the Invention) However, in the method for forming the convex portion shown in FIG. As shown in FIG. 13, it is necessary to plastically flow sufficient material into the recess 19.

For this reason, during plastic working, the recess 19 of the die 17 is in a sealed state, and extremely large molding pressure is generated locally, shortening the mold life. There is a problem that the load increases.

Furthermore, as shown in FIG. 14, when the depth of the concave portion 19 is increased and the tip portion is not restrained, when forming is performed, the convex portion 13 is There is a problem in that the heights are partially different and it is not possible to obtain a planar tip.

Therefore, as shown in FIGS. 15 and 16, a punch-side convex portion 13 smaller than the concave portion 19 is formed in the punch 15 at a position corresponding to the concave portion 19 of the die 17. By pressing the plate material 11, the plate material 1
Although it is conceivable to form a convex portion 13 of a predetermined shape on 1, the same problem as described above occurs also in this case.

On the other hand, in the method of forming the convex portion shown in FIG.
Since the punch side convex part 21 is formed on the punch side convex part 5, it is a half-blanking process, and the convex part 13 having a uniform height can be obtained without constraining the tip part. 21 is the same as the shape of the concave portion 19 of the die 17, and if the convex portion 21 to be formed is small, it becomes very difficult to manufacture the mold, and there is a problem that the life of the mold is shortened. .

Furthermore, since it is a punching process, the height of the punch side convex part 21 is almost the same as the height of the convex part 13 to be formed, and in terms of product strength, the minimum plate thickness (three dimensions in Figure 12) If there is a restriction on this, there is a problem that the height of the convex portion 13 that can be formed is limited.

The present invention solves the above-mentioned problems, and is a method of forming a convex part that can easily form a convex part of a predetermined shape even though the tip of the convex part is molded in an unrestricted state. The purpose is to provide a method.

[Means to solve the problem]

The method for forming a convex portion according to the present invention is to arrange a plate material between a punch and a die that are arranged facing each other, and press the facing surface of the punch against the facing surface of the die. In the method for forming a convex part in which a part of the plate material is plastically flowed into a concave part formed on a surface to form a convex part of a predetermined shape in the plate material, the punch side is eccentric from a position facing the concave part of the die in the punch. A convex portion is formed, and this punch-side convex portion applies plastic flow to the plate material in the direction of the plate material and in the thickness direction, thereby forming a convex portion of a predetermined shape on the plate material.

[For production]

In the method for forming a convex portion of the present invention, a punch side convex portion is formed eccentrically from a position facing a concave portion of a die in a punch, and this punch side convex portion causes plastic flow in a plate material in the direction of the plate material and in the thickness direction. A convex portion having a predetermined shape is formed on the plate material.

〔Example〕

Hereinafter, details of the method of the present invention will be explained using the drawings.

FIG. 1 and FIG. 2 show an example of a molded product manufactured by the method of molding a convex portion of the present invention, and this molded product has the following characteristics:
A large number of protrusions 33 are concentrically formed on one surface of a donut-shaped metal plate 31, and the outer periphery of the plate 31 is curved toward the other surface of the plate 31.

This molded article is manufactured by the method of the present invention as described below.

That is, as shown in FIG. 3, a donut-shaped plate material 31 having a through hole 39 in the center is placed between a punch 35 and a die 37 which are arranged facing each other, and the opposite surface of the punch 35 is connected to the die 37. die 37 by pressing against the opposing surface of
A part of the plate material 31 is plastically flowed into the recessed part 41 formed on the opposing surface of the plate material 3I, and a convex part 33 of a predetermined shape is formed on the plate material 3I.

However, in this method of forming the convex portion, the punch 35 includes:
A punch-side protrusion 43 is formed eccentrically by a predetermined distance from a position facing the recess 41 of the die 37 in the punch 35;
The punch-side convex portion 43 imparts plastic flow to the plate material 31 in the direction of the plate material 31 and in the thickness direction, thereby forming the convex portion 33 of a predetermined shape on the plate material 31.

That is, in the method of the present invention, as shown in FIG. By locating the convex portion 33 in the center, the convex portion 33 is formed on the plate material 31 due to uniform plastic flow of the material toward the inner diameter side of the plate material 31.

That is, when forming the punch-side convex portion 43 at such a position, the plastic flow of the material occurs not only in the thickness direction of the plate material 31 but also in the direction of the plate material 31, as shown by the arrow in FIG. arise. The watershed of the plastic flow of the material in the direction of the plate material 31 is considered to be the central axis A of the shape of the punch side convex portion 43.

Therefore, if the balance of the plastic flow of the plate material in the left and right directions around this watershed is different, the heights will be different on the left and right sides of the convex portion 33.

Therefore, by positioning the center position A of the shape of the punch side convex part 43 eccentrically with respect to the position of the convex part 33 of the product to be formed, the balance of the material flow is changed, as shown in FIG. In this manner, it is possible to form the convex portion 33 of uniform height on the plate material 31 with the tip end unrestricted.

In this embodiment, the through hole 39 is formed in the center of the plate material 31, and the flow of material toward the through hole 39 side inevitably becomes large. The central axis A of the recess 41 formed in the die 37 is located eccentrically outward by a distance from the central axis B of the recess 41 .

That is, the relative positional relationship between the punch-side convex portion 43 and the convex portion 33 to be formed differs depending on the shape of the product to be formed, and the convex portion 33 formed depending on the size and shape of the punch-side convex portion 43 The thickness and shape will be different.

Furthermore, by actively destroying the balance of plastic flow using the punch-side convex portion 43, for example, as shown in FIG. It is possible to form the

However, in the method of the present invention, the die 3 in the punch 35
A punch side convex portion 43 is formed eccentrically from a position facing the concave portion 41 of No. 7, and this punch side convex portion 43 allows the plate material 31
A plastic flow is applied to the plate material 3 in the plate direction and in the plate thickness direction.
Since the convex portion 33 of a predetermined shape is formed in 1, the convex portion 33 of a predetermined shape can be easily formed even though the tip of the convex portion 33 is molded in an unrestricted state. Become.

Since the tip can be molded without being constrained, the die 37
Since no local molding pressure is generated within the recess 41, molding can be performed with a relatively low load, and the life of the mold can be extended.

FIG. 7 shows an example in which the concave portion formed on the die and the punch-side convex portion formed on the punch are located on the same line, and the convex portion 47 is formed with the tip end unrestrained. In the example, as shown by the arrow in the figure, since the plastic flow in the inward direction is large, the height of the inner protrusion becomes higher, for example, by about 0.15 mm than the outer height ha of the protrusion 47. Further, the processing load for molding was 120 tf.

On the other hand, in the example shown in Fig. 4, when the same product as that shown in Fig. 7 is molded, the plastic flow in the outward direction is larger than in the case of Fig. 7. Even if the convex portion 33 is formed in the unrestricted state, the height ho of the outer convex portion
and the height hl of the inner convex portion, for example, from 0.02 to
The thickness could be reduced to about 0.04 mm, and the processing load for molding was 80 tf.

In addition, in the embodiment described above, an example was described in which the present invention was applied to the molding process of a plate material 31 having a relatively small area, but the present invention is not limited to such an embodiment, and the area of the plate material is very small. Needless to say, the present invention can be similarly applied to a forming process in which a convex portion is formed on a part of a large plate material. In this case, as shown in FIG.
It is desirable to form a hole 5I or a slit 53 at or near 9 for causing plastic flow of the material.

〔Effect of the invention〕

As described above, in the method for forming a convex portion of the present invention, a punch side convex portion is formed eccentrically from a position facing a concave portion of a die in a punch, and this punch side convex portion allows a plate material to be formed in a sheet material direction and a sheet thickness direction. Since the plate material is given plastic flow to form a convex part of a predetermined shape, the convex part of a predetermined shape can be easily formed even though the tip of the convex part is formed in an unrestrained state. It has the advantage of being able to

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an example of a molded product manufactured by the method for molding a plate material of the present invention. FIG. 2 is a side view showing the molded product of FIG. 1. FIGS. 3 and 4 are explanatory diagrams showing an embodiment of the method for forming a convex portion of the present invention. FIG. 5 and FIG. 6 are explanatory diagrams showing a convex portion formed by the convex portion forming method of the present invention. FIG. 7 is an explanatory diagram showing an example of a conventional method for forming a convex portion. FIG. 8 is an explanatory diagram showing another embodiment of the method for forming a plate material of the present invention. FIGS. 9 to 16 are explanatory diagrams showing a conventional method of forming a plate material. [Explanation of symbols of main parts] 31... Plate material 33... Convex portion 35... Punch 37... Gui 41... Concave portion 43... Punch side convex portion. Figure 1 Figure 259 115 Figure 6 Figure wI 7 Figure\45 Figure 351 Figure 8 41 (αI city)' l ' \ Figure 4! ! Figure 12 Garden 13m Figure 14 (＼

Claims (1)

[Claims] (1) A plate material is disposed between a punch and a die that are arranged to face each other, and by pressing the opposing surface of the punch against the opposing surface of the die, the recess formed on the opposing surface of the die is pressed. In a method for forming a convex part in which a part of a plate material is plastically flowed to form a convex part of a predetermined shape on the plate material, the punch side convex part is formed eccentrically from a position facing the concave part of the die in the punch, and A method for forming a convex portion, characterized in that a convex portion having a predetermined shape is formed on the plate material by applying plastic flow to the plate material in the direction of the plate material and in the direction of the thickness of the plate material using the side convex portions.