JP2000301247A - Deep drawing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To implement the deep drawing of a hard metal difficult to deep-draw with an excellent yield by placing a sheet to be deep-drawn on the upper surface of a recess-forming surface side of a female die, pressing the peripheral portion of the sheet against the recess-forming surface, and inserting a male die into the recess-forming surface. SOLUTION: A titanium sheet 3 to be worked is placed on a recess-forming surface 21 of a female die 2. A holding plate 4 is placed on the titanium sheet 3, a nut 8 is screwed in a bolt 5 and the holding plate 4 is pressed against the recess-forming surface 21. The pressing is achieved by a male die 1 while uniformly pressing and holding the peripheral edge portion of the titanium sheet 3. No wrinkles or cracks are generated in the titanium sheet 3. A formed stock obtained through the preliminary deep drawing is preferably deep-drawn by repeating the deep drawing until the formed stock is of the desired shape using another deep drawing die comprising, for example, a male die having a projection-forming surface and a female die having a recess-forming surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deep drawing method, and more particularly to a pressing method for favorably deep drawing a material such as a hard metal such as titanium.

[0002]

2. Description of the Related Art Titanium, for example, is a metal having high strength, light weight and corrosion resistance.
Utilizing such features, it is used for materials in various fields such as automobile parts and camera parts. By the way, this titanium component is usually formed into a predetermined shape by forming by a hydraulic press or the like, particularly by deep drawing.

[0003]

However, when forming a hard metal plate such as titanium, for example,
When this is formed, the yield of the product is poor due to the problem that wrinkles or cracks occur on the surface to be formed, and therefore it is extremely difficult to perform deep drawing forming on a titanium thin plate until now. In addition, it was extremely difficult to mold a large amount. This is because titanium is harder and harder to expand than other metals such as aluminum and stainless steel, and therefore, when deep drawing is performed, cracks are generated on the surface to be formed.

[0004] Therefore, an object of the present invention is to provide a deep drawing method for forming a deep metal with a high product yield on a hard metal material such as titanium which is difficult to be deep drawn. .

[0005]

According to the present invention, there is provided a deep drawing method comprising the steps of: performing deep drawing using a mold comprising a male die and a female die; A plate material to be molded is placed, and deep drawing is performed by inserting the male mold into the concave molding surface while the peripheral portion of the plate material is pressed against the concave molding surface. .

In the molding method of the present invention, preferably,
The preliminary molded product obtained by the deep drawing is further deep drawn using another mold. In the forming method of the present invention, for example, the plate material to be formed is a titanium thin plate.

Further, in the forming method of the present invention, for example, the pressing of the plate material is performed by a pressing plate provided on the upper side of the concave forming surface of the female die. In this case, the holding plate is attached to the peripheral edge of the concave molding surface by, for example, tightening using a bolt and a nut.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a molding die composed of a male mold 1 and a female mold 2 used in the method of the present embodiment. The male mold 1 has a convex molding surface (convex surface) 11 of a desired shape on the side facing the female mold. The female mold 2 has a concave molding surface (concave surface or recess) 21 corresponding to the convex molding surface 11 on the side facing the male mold.

A holding plate 4 is provided on the upper part of the female mold 2 on the side of the concave molding surface 21. Further, between the concave forming surface 21 and the holding plate 4, for example, a thin titanium plate 3 which is a plate material to be formed is sandwiched. The titanium thin plate has, for example, a thickness of 1.5
mm, diameter of about 190 mm to 200 mm, square,
It is circular or of any shape.

In the above construction, the titanium thin plate 3 to be molded is placed on the concave molding surface 21 of the female die 2, the holding plate 4 is further placed thereon, and the nut 8 is attached to the bolt 5. The pressing plate 4 formed integrally or separably is pressed in the direction of the concave forming surface 21 by screwing.

With the above configuration, the holding plate 4
As a result, the peripheral portion of the titanium thin plate 3 is pressed and held, so that the peripheral portion of the titanium thin plate 3 is pressed against the peripheral portion of the forming surface 21, and during deep drawing, the titanium thin plate 3 Male mold 1 while pressing and holding the periphery evenly
Since press forming is performed by the method, the generation of wrinkles and cracks in the titanium thin plate can be prevented or suppressed.

A molded product 31 obtained as a result of preliminary deep drawing with the mold of FIG.
The deep drawing mold is further formed by the deep drawing mold including the male mold 6 having the convex molding surface (convex surface) 61 and the female mold 7 having the concave molding surface (concave surface) 71 shown in FIG. . As described above, the preliminary deep drawing and the deep drawing of the present method are performed using different molds, respectively.
Press processing is repeated several times until the desired shape is obtained.

Although the above description has been made of an example in which titanium is used as a material to be molded, the present invention can be applied to a case where a metal which is difficult to mold is used as a material to be molded. Further, it is needless to say that the present invention can be applied to general press working in which a normal soft metal plate is formed into a desired shape.

[0014]

According to the deep drawing method of the present invention, it is possible to perform not only general press working but also a deep drawing method capable of effectively forming a deep drawing material such as titanium. This has the advantage that it can be provided without requiring a large-scale device.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a mold and a press plate used in a deep drawing method in an embodiment according to the present invention.

FIG. 2 is a plan view showing a female mold and a holding plate constituting a mold.

FIG. 3 is an explanatory view showing another mold used in the deep drawing method according to the embodiment of the present invention.

FIG. 4 is a plan view showing a female mold constituting the metal mold.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Male type 2 Female type 3 Titanium thin plate 4 Holding plate 5 Bolt 8 Nut 11 Convex molding surface 21 Concave molding surface 31 Molded product

Claims (5)

[Claims] 1. A method of performing deep drawing using a mold comprising a male mold and a female mold, wherein a plate material to be molded is placed on the upper surface of the female mold on the concave molding surface side, With the peripheral part pressed against the concave molding surface,
A deep drawing method, wherein the male mold is inserted into the concave forming surface to perform deep drawing. 2. The deep drawing method according to claim 1, wherein the molded product obtained by the deep drawing is further subjected to deep drawing using another mold. 3. The deep drawing method according to claim 1, wherein the plate is a titanium thin plate. 4. The depth according to claim 1, wherein the pressing of the plate pressure is performed by a pressing plate detachably attached to an upper portion of the female mold on the concave molding surface side. Drawing method. 5. The deep drawing method according to claim 1, wherein the holding plate is attached to a peripheral portion of the concave forming surface by tightening using a bolt and a nut. .