JP2005066635A - Method for manufacturing metallic parts having spring property - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture aimed parts by performing press working without generating cracks and cleavages on a metallic material having spring property. <P>SOLUTION: The method for manufacturing parts having a three-dimensional structure by performing press working to a sheet-like metallic material having the spring property, has a blanking stage for blanking an intermediate parts having a main body part and a bending part from the sheet-like metallic material and a hemming stage for hemming the bending part of the intermediate parts, and when performing these stages, the material is set so that the bending line in the bending part is situated in the direction crossed the direction of roll marks formed in the rolling stage of the sheet-like metallic material having the spring property. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for producing a part having a three-dimensional structure by pressing a sheet-like spring metal material.

The sheet-like metal material has thin streaks remaining in the direction of the rolling roll generated in the rolling stage, and is called a roll, but this is not only the surface, but also the metal crystal structure along the roll direction. It has directionality. For this reason, when pressing using a sheet-like metal material, it is necessary to fully consider whether or not it conforms to the roll direction, and if it does not conform to the roll direction, the product deforms or forms well. The problem that cannot be done.

  This is more conspicuous for a metal material having a strong spring property such as phosphor bronze, and is also applicable to an alloy made of copper, zinc, nickel, which is called, for example, white or silver. In particular, in the case of white, cracks and cracks are likely to occur during bending such as hemming, and when a secondary processing force is applied to the bent part, the cracks progress and cracks occur.

JP-A-10-330867

  The present invention has been made paying attention to the above points, and the problem is to be able to manufacture a desired part by performing press working without causing cracks or cracks in the spring metal material. It is.

  In order to solve the above-mentioned problems, the present invention relates to a method for producing a part having a three-dimensional structure by pressing a sheet-like spring metal material, from the sheet-like metal material, the main body portion and the bending portion. And a hemming process for hemming the bent part of the intermediate part. In carrying out these processes, at the rolling stage of the sheet-like spring metal material A measure is taken to set the bend line of the bent portion in a direction crossing the formed roll eye direction.

  The three-dimensional structure of the component to be manufactured according to the present invention is composed of a main body part and a bending part for hemming bending a part of the main body part, and the bending part is three-dimensional with respect to the main body part. It means a state. Therefore, it does not matter whether the main body is planar or three-dimensional.

Examples of the sheet-like spring metal material that is a subject of the present invention include the above-mentioned materials for spring white, spring phosphor bronze and other copper products. In addition, stainless steel, beryllium copper, and the like can also be targeted.

  The manufacturing method of the present invention has two processes with different purposes, namely, a punching process for punching an intermediate part from a sheet-like metal material and a bending process for bending the intermediate part. In the punching process, a sheet-shaped metal material is pressed to produce an intermediate part consisting of a main part and a bent part. The bent part is a name for distinguishing it from the main part. The part need not be bent with respect to the body part.

  In carrying out the punching step, it is set so that the direction of the roll of the sheet-like metal material and the direction of the bending line of the bending portion intersect. In particular, in the case of a sheet metal material having a spring property, cracks are likely to occur when the roll direction and the direction of the bending line of the bent part are parallel, whereas the direction of the roll line and the bending line of the bent part are easily changed. This is a result of obtaining knowledge that crack generation can be avoided by setting the non-parallel direction, most preferably the orthogonal direction.

  The hemming process for the bent part attached to the body part of the intermediate part is gradually performed in a plurality of stages. In each stage, it is desirable that the degree of bending that can be performed is 90 degrees or less, and that at least three stages of machining are performed before hemming is completed (see FIG. 1).

  The manufacturing method of the present invention can include a step of crushing a bent portion after hemming, but the present invention has found a range in which crushing can be performed without causing cracks. This range is 0 to 50 ° and is common to spring metal materials.

  The present invention can further include a step of drawing the main body including the bent portion that has been hemmed. In this case, a drawing punch provided with a recess for accommodating the bent portion is used so that the processing force during drawing does not deform the bent portion. Thus, according to the method of the present invention, it is possible to easily manufacture a part in which a bent portion is hemmed on a main body having a three-dimensional structure such as a box.

Since the present invention is configured and operates as described above, it is possible to produce a desired part by pressing a metal material having a spring property without causing cracks or cracks. Play.

  Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 shows steps I, II, III, IV, V, and VI in which a sheet-like spring metal material 10 (see FIG. 11) is pressed to produce a part having a three-dimensional structure through an intermediate part 11. Yes. I denotes intermediate parts 11, II, III, and IV obtained through the punching process, 3 denotes a hemming stage, V denotes a crushing process, and VI denotes a part 12 completed through a drawing process.

  FIG. 2 shows a form of a metal cover manufactured in the embodiment of the present invention. The cover has a three-dimensional structure, and has a locking claw protruding from the main body 13 as a bent portion 14 as a cover attaching portion means. doing. That is, the bent portion 14 is the locking claw itself, and a crushing portion 15 is formed at the tip of the locking claw as shown in detail in FIG. Making it easy.

  The spring metal part 12 having such a shape and structure is manufactured through the steps shown in FIGS. The illustrated metal part 12 is made of white and white, and the direction of the bending line 16 of the bending portion 14 is aligned with the direction orthogonal to the roll direction. The relationship between the roll direction 17 and the bending line 16 is schematically shown in FIG. Is shown.

FIG. 4 shows a state in which the metal material 10 is pressed by the punching punch 18 and the punching die 19 and the intermediate part 11 is punched. 4 corresponds to the stage I in FIG. 1, but the intermediate part 11 is not completely separated from the metal material 10, and each process is performed while maintaining the integrity with the metal material 10. Move (see FIG. 12).

  FIG. 5 shows a process of applying a first stage bending process to the bending portion 14 of the intermediate part 11 by the bending punch 20 and the bending die A. The bending portion 14 is pressed along a bending line 16 perpendicular to the roll direction, bent about 90 degrees with respect to the main body portion 13, and corresponds to Step II in FIG.

  FIG. 6 shows a process of applying a second stage bending process to the bending portion 14 by the bending punch 21 and the bending die B. In the second stage bending process, the bending angle is further increased by about 45 degrees compared to the first stage, and as a result, the bending portion 14 is bent about 135 degrees with respect to the main body portion. This stage corresponds to step III in FIG.

  FIG. 7 shows a step of performing a third stage bending process on the bending portion 14 by the bending punch 22 and the bending die C. This stage is the final stage of the bending process, and the bending part 14 is bent 180 degrees with respect to the main body part 13 to complete the hemming process. This stage corresponds to step IV in FIG.

  FIG. 8 shows a step of crushing the hemming portion by the bending punch 23 and the bending die D. By this crushing process, an inclined surface 24 having an inclination angle θ from the bent portion horizontal portion of about 48 degrees is formed in the hemming portion. This stage corresponds to step V in FIG.

  FIG. 9 shows a process of drawing a part of the main body 13 having the bent part 14 subjected to the crushing process by the drawing punch 25. The drawing punch 25 has a recess 26 in which the bending portion 14 is accommodated so that the bending force 14 is not subjected to a processing force during drawing. By this drawing process, locking claws 27 having the bent portion 14 at the tip are formed on both sides of the main body portion 13. This step corresponds to step VI in FIG.

  The process VI corresponds to the process described as the angular aperture in FIG. By removing the outer shape in this step, the workpiece is completely separated from the metal material 10, and the desired spring metal part 12 is completed.

  The present invention has the contents as described above, and can accurately and easily mass-produce metal parts having spring properties. The package or the semiconductor device according to the metal stamping field and the use of the metal parts is provided. There is a possibility that it can be used in the field of cellular phone casings.

Explanatory drawing which shows the manufacturing method of the spring metal component which concerns on this invention to process order. The back view which shows one example of the spring property metal product which concerns on this invention. (B) The bottom view same as the above. (C) Similarly side view. (A) The principal part expanded side view of the product of FIG. (B) The principal part enlarged front view similarly. Explanatory drawing which shows a hole punching process. Explanatory drawing which shows the 1st step of a bending process. Explanatory drawing which shows the 2nd step of a bending process. Explanatory drawing which shows the 3rd step of a bending process. Explanatory drawing which shows a crushing process. Explanatory drawing which shows a drawing process. Explanatory drawing with the product removed. Explanatory drawing which shows the shaping from a metal material. Explanatory drawing which shows the process in the metal material by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Metal material 11 Intermediate part 12 Completed part 13 Main-body part 14 Bending part 15 Crushing part 16 Bending line 17 Roll roll direction

Claims (3)

A method for manufacturing a part having a three-dimensional structure by pressing a sheet-like spring metal material, and punching an intermediate part having a main body portion and a bent portion from the sheet-like metal material A punching step and a hemming step of hemming the bent part of the intermediate part, and in carrying out these steps, it intersects with the roll direction formed in the rolling stage of the sheet-like spring metal material. A method for producing a spring metal part, characterized in that the bending line of the bending part is positioned in the direction. 2. The method of manufacturing a spring metal part according to claim 1, wherein the metal material is phosphor bronze for spring, spring white for spring, or an equivalent spring metal material. It includes a step of gradually hemming the bent part of the intermediate part in multiple stages, and then drawing the main part including the bent part. 2. The method of manufacturing a spring metal part according to claim 1, wherein a drawing punch provided with a recess for accommodating the bent portion is used so that the bent portion is not deformed.

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