JP2007196249A - Method for manufacturing special shape plate member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a low yielding ratio in using a band steel as a raw material when plate members having special shape profiles, such as a bracket for supporting small components and a link plate of a roller chain, are formed by plastic working. <P>SOLUTION: The method for manufacturing the special shape plate members includes a step of preparing a billet of raw material by cutting off a wire, an intermediate step of forming a partially fabricated product having a round bar shape corresponding to the profile of the product by setting the billet to a former, and a step of crushing the partially fabricated product into a plate shape by squeezing the partially fabricated product between the flat surfaces of metallic dies. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a plate-like member having an irregular shape, such as a bracket for supporting small parts and a link plate for a roller chain.

  Conventionally, a general method for manufacturing this type of member is to punch a steel strip with a press machine to create a contour of the plate-like member, and then to adjust the shape by adding drilling to the burr and return produced by the previous process. The product is removed.

  However, in the manufacturing method in which this type of member is punched by a conventional press machine, a steel strip is used as a raw material, and punching is performed from there. Therefore, the yield of the raw material is reduced, and the process of removing burrs generated when punching is performed. Needed.

  In addition, a method of cold forging using a small piece obtained by cutting a wire, a so-called billet, or a former, a so-called forging machine, a billet between two molds of a stamping die and a receiving die. It is not unthinkable to use a forging method in which the material is sandwiched and molded.

However, the cold forging method is a plastic forming method that uses a closed mold, and is suitable for the production of parts that require a relatively precise shape, but is inexpensive in terms of equipment price and production speed. It was not suitable for mass production of parts.

Also, the forging method is a relatively recent manufacturing method that has improved practicality.
This is a molding method in which a billet is sandwiched between a pressing die and a receiving die and pressed into a flat plate shape. However, since a closed mold is not used, it is not suitable for a member having a complicated shape, and is suitable for mass production of a simple and inexpensive member.

However, since a thickness direction can be accurately formed when a plate-shaped member is formed, development of some technique capable of accurately forming the outline of the outer shape is required.
Japanese Patent Laid-Open No. 7-100580

  The problem to be solved is to obtain a manufacturing method for manufacturing a deformed plate member having a special contour by using a mold having a relatively simple former structure.

  The present invention includes a preparatory step of cutting a wire rod to form a billet of a material, an intermediate step of setting a billet on a former and manufacturing a semi-molded product having a rounded shape corresponding to the contour of the product, and the semi-molded product The most important feature is that it includes a forging step in which the metal is pressed between flat surfaces of the mold and pressed into a plate shape.

  In this case, it is preferable to include a process of pushing and fixing a rotating pin that advances and retracts integrally with the mold in the axial direction between the intermediate process and the forging process. In addition, the semi-molded product may be formed into a tapered rod having both ends spherical, and a substantially oval bracket material may be molded.

  In the method for manufacturing a deformed plate-shaped member according to the present invention, a round-shaped semi-molded product is formed by pressing between two surfaces of a pressing die and a receiving die, and therefore, a wall surface of a mold that forms a contour is used. And a plate material having a required shape can be formed. Therefore, the structure of the mold can be simplified, and excellent economy and mass productivity can be obtained.

  Also, because the deformed plate-shaped member is forged, the peripheral edge forming the contour tends to bulge in the center in the thickness direction, and there is no burr as in the case of punching, so a deburring process is required. Improve productivity.

  The most preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a use state of a bracket 10 which is a deformed plate member according to an embodiment of the present invention, and shows a vehicle fuel piping member 14 configured by brazing a steel pipe 12 to the bracket 10. Here, 10a is a bolt hole for attaching the piping member 14 to the frame of the vehicle.

  As shown in FIG. 2, the bracket 10 is a plate-like member having a substantially oval shape in which a large arc 10b and a small arc 10c are connected by straight lines 10d and 10d. A large through hole 10e for the steel pipe 12 and the bolt hole 10a are drilled concentrically with the arcs 10b and 10c.

  As will be described later, the bracket 10 is formed into a plate shape by sandwiching the material by two flat surfaces, and therefore, the outline of the bracket 10 bulges outward slightly from the center in the plate thickness direction. The part close to both sides of the plate thickness has a slightly receding shape due to friction with the mold, and no burr is produced during molding. This state is exaggerated in FIG. 2 (b).

  Next, a method for manufacturing the bracket 10 will be described. First, a forging machine and a steel wire winding are prepared for processing. And the winding is cut | disconnected and the billet 20 of a raw material is made as shown in Fig.3 (a). In addition, this preparation process is the same as the billet manufacturing means conventionally used when using a steel wire, and detailed description is abbreviate | omitted.

  The billet 20 is set in a former and compressed in the axial direction to perform an intermediate process. In the intermediate process, a semi-molded product 22 having a slightly thicker portion than the original billet 20 is formed as shown in FIG. The semi-molded product 22 has a circular cross-sectional shape, and its outer shape line 22a substantially corresponds to the outline of the product, and one end has a slightly larger diameter and the other end has a slightly smaller diameter, and the end 22b has a hemispherical shape. It has been rounded.

  Next, the forging process is performed. Here, as shown by a two-dot chain line in FIG. 2B, the outer diameter portion of the semi-molded product 22 is pressed between the flat surfaces 23 and 24 of the mold and crushed into a plate shape. The flat surface 23 of the mold is provided with a pin 23a extending at a right angle, and a temporary process of biting into the semi-molded product 22 is performed prior to forging, and the semi-molded product 22 is rotated during forging. Fix the product shape so that it does not become asymmetrical.

  Reference numeral 25 denotes a forged product obtained by the pre-forging step, and the plate thickness and outline are substantially the same as the product. Reference numeral 25a denotes an impression generated by the pin 23a in the forging process. The forged product 25 is then perforated by a process not shown in the drawing to provide the bolt hole 10a and the large through hole 10e. At the same time, the indentation 25a is also removed to obtain the product shown in FIG. Since the subsequent steps are the same as the drilling step in the conventional forging method, a detailed description is omitted.

  In this example, what was produced by conventional press working and had a material weight of 21 grams was now 13 grams, saving 8 grams.

  The present invention is not limited to the manufacture of brackets and stays, but can also be applied to the manufacture of transmission members such as link plates of transmission chains.

It is an external view of the member using the deformed plate-shaped member which is implementation of this invention. An irregular plate-shaped member is shown, (a) is a front view, (b) is the center cross-sectional view. It is process drawing which shows the forging method of a deformed plate-shaped member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bracket 10a Bolt hole 10b Large circular arc 10c Small circular arc 10d Straight line 10e Large through-hole 12 Steel pipe 14 Fuel pipe member for vehicles 20 Billet 22 Semi-molded product 22a Outline line 22b End 23, 24 Flat surface 23a Pin 25 Forging Product 25a Indentation

Claims (3)

  A preparatory process for cutting a wire to make a billet of the material, an intermediate process for setting a billet in a former and producing a rounded demi-shaped product corresponding to the contour of the product, and the semi-molded product as a flat mold A deformed plate-like member manufacturing method including a forging step of pressing between flat surfaces and crushing into a plate shape.   The manufacturing of a deformed plate-like member according to claim 1, comprising a step of pressing and fixing a rotating pin that advances and retreats integrally with the mold in the axial direction between the intermediate step and the forging step. Method.   2. The method of manufacturing a deformed plate-shaped member according to claim 1, wherein the semi-molded product is a tapered rod having spherical surfaces at both ends, and a substantially oval bracket material is molded.

Images