JP2008012574A - Die and method of manufacturing product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce scratches on product than those in the conventional practice in a method of manufacturing the product in which the product having a prescribed thickness and a prescribed shape is separated from an extruded part after performing shaving work to a prescribed part of a planar workpiece which is extruded in the thickness direction by the cooperation of a punch and a die. <P>SOLUTION: This method has an extrusion stage where the prescribed part of the planar workpiece in the thickness direction of the workpiece is extruded and a shaving stage where the product is separated in the prescribed part after shaving the extruded part which is extruded in the extrusion stage by the cooperation of the punch with the die provided with a positive rake angle. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a manufacturing method of a product and a die used in the manufacturing method, and more particularly to manufacturing a product by shaving.

  Conventionally, fine blanking and shaving are known as methods for obtaining a precise cut surface in punching with a press.

Further, as a shaving die for obtaining a product having a predetermined shape from a work material (work), a shaving die having a positive rake angle is known. (For example, refer to Patent Document 1).
JP-A-5-228729

  By the way, the fine blanking process has a drawback that it requires an advanced mold manufacturing technique, has low productivity, and has a short mold life.

  Further, in the conventional shaving process, productivity is high, but dents due to swarf (cutting chips) are likely to be generated, and when a higher quality cut surface is required, a single cutting amount ( It is necessary to perform shaving many times with a small allowance. Further, as the shaving allowance becomes finer, advanced die processing technology is required. Furthermore, slight wear of the mold has an adverse effect on the machining surface, and the mold must be replaced when the slight wear occurs, resulting in a short life of the mold. Further, depending on the material of the workpiece, the shaving process becomes difficult. In particular, shaving is difficult with hard materials.

  The deterioration of the machined surface will be described in more detail. In machining using a punch with a rake angle of “0 °”, for example, if the machining allowance is too large, the amount of scrap (the amount of cutting waste) that is trapped on the lower surface of the punch to be machined ) Increases and resistance increases. Then, the cutting waste stops moving along the surface of the punch, and eventually, the cutting waste rotates so as to be turned up from the surface of the punch, and this rotation causes scratches such as cracks on the cut surface of the product. Such a phenomenon also occurs when shaving is performed using a die having a rake angle of “0 °”.

  Therefore, a method of performing shaving using a die having a positive rake angle has been proposed, as in the method described in Patent Document 1.

  However, in the processing described in Patent Document 1, since a workpiece is obtained by using a die to obtain a product, in other words, since the workpiece is separated into a chip and a product using a die, the workpiece becomes finer. There is a problem that the chip may be damaged, for example, when the cutting powder sticks to the cutting surface of the product and is pressed thereafter.

  The present invention has been made in view of the above problems, and a predetermined portion of a plate-shaped workpiece extruded in the thickness direction is subjected to shaving by cooperation of a punch and a die, and the extrusion processing An object of the present invention is to provide a method of manufacturing a product that separates a product of a predetermined shape having a predetermined thickness from a portion that has been formed, and a die that can reduce damage to the product as compared with the conventional die. To do.

  According to the first aspect of the present invention, an extruding process for extruding a predetermined part of a plate-like work in the thickness direction of the work, and a part extruding in the extruding process is a punch and a positive scoop. And a shaving process of separating the product from the predetermined portion by cooperating with a die having corners.

  According to the second aspect of the present invention, a predetermined portion of the plate-like workpiece extruded in the thickness direction is subjected to a shaving process in cooperation with a punch, and a predetermined thickness is obtained from the extruded portion. A die for separating a product having a predetermined shape, the die having an opening substantially the same as the shape of the product, and a cutting blade formed with a positive rake angle at the periphery of the opening. It is.

  According to the present invention, a predetermined part of a plate-like workpiece extruded in the thickness direction is subjected to shaving by the cooperation of a punch and a die, and a predetermined thickness is provided from the extruded part. In addition, the product manufacturing method for separating a product having a predetermined shape and the die have an effect that damage to the product can be reduced as compared with the conventional method.

  1 and 2 are diagrams showing a schematic configuration of a main part of a mold 100 for manufacturing a product according to an embodiment of the present invention. 1 shows the state of the mold 100 and the like after the extrusion process and before the shaving process, and FIG. 2 shows the state of the mold 100 and the like after the shaving process.

  The mold 100 is for obtaining a product W7 by shaving a predetermined part W1 of the workpiece W.

  The mold 100 includes a punch 1, a die 3, and a die holder 5 for holding the die 3. By installing the mold 100 in, for example, a servo press, the die 3 is relative to the punch 1 and the workpiece W in the vertical direction of FIGS. W moves up and down in FIGS. 1 and 2, and shaving is performed. Note that the workpiece W is held by the workpiece presser 15 when performing the shaving process.

  The extrusion process performed before the shaving process described above is performed by a mold (not shown) different from the mold 100, but the mold 100 and the other mold are sequentially fed. It may be incorporated in the mold.

  Here, the extrusion process will be described in detail.

  The extruding process performed before the shaving process is to extrude a predetermined part of the plate-like workpiece W in the direction of the thickness t1 of the work W (plastic working) to obtain the predetermined part W1.

  The predetermined portion W1 subjected to the extrusion process has the thickness t3 direction substantially coincides with the thickness t1 direction of the other portion W3 of the workpiece W, and the thickness W1 from the other portion W3 of the workpiece W in the thickness t1 direction. It protrudes in one direction (downward direction in FIG. 1). Further, the predetermined portion W1 that has been subjected to extrusion processing is connected to the other portion W3 of the workpiece W via a thin connecting portion W5 around the entire periphery of the portion W1 that has been subjected to extrusion processing.

  The extrusion process is a punch (not shown) having a shape slightly larger than the size of the product W7 (a shape in which an edge having a predetermined slight width is provided on the entire circumference of the shape when the product W7 is viewed from the thickness direction). ) And a die (not shown) (for example, with the workpiece W sandwiched between the punch and the die in the thickness t1 direction). Accordingly, when viewed from the direction of the thickness t1 of the workpiece W, the predetermined portion W1 that has been subjected to extrusion processing has a shape slightly larger than the size of the product W7 (the shape of the product W7 viewed from the thickness direction is almost the entire shape. The shape is provided with an edge having a predetermined slight width ΔC1 around the circumference).

  Next, the shaving process will be described in detail.

  In the shaving process, the portion W1 extruded by the extrusion process is processed by the cooperation of the punch 1 and the die 3 having a positive rake angle α and a clearance angle of “0 °”. That is, in the state shown in FIG. 1 (the state where the upper surface of the part W1 is in contact with the lower surface 7 of the punch 1 and the lower surface of the part W1 is in contact with the tip of the cutting blade 9 of the die 3) Shaving is performed in the direction of the thickness t3 of W1, and the product W7 is punched from the predetermined portion W1 and separated.

  The punch 1 has a shape in which the cross section of the plane perpendicular to the axis CL1 (axis extending in the direction of the thickness t1 of the workpiece W when shaving) is slightly smaller than the size of the product W7 (the product W7 is thicker). A shape obtained by removing an edge of a predetermined slight width ΔC5 on almost the entire circumference of the shape when viewed from the side. Further, the end portion 7 of the punch 1 (the lower surface in contact with the predetermined portion W1 subjected to extrusion processing) 7 is formed in the same planar shape as the cross section of the punch 1.

  The hole (opening) 11 of the die 3 has substantially the same shape as the product W7 (product) when viewed from the axis of the die 3 (axis extending in the direction of the thickness t1 of the workpiece W when shaving) CL1. W7 is a shape when viewed from the thickness direction). Further, a cutting edge 9 having a positive rake angle α is formed on one side (upper side in FIG. 1) of the die 3 in the direction of the axis CL1 in the periphery of the hole 11 of the die 3.

  The clearance angle of the cutting edge 9 is “0 °”. By setting the clearance angle to “0 °”, the die 3 can be easily used for regrinding. Further, a hole (escape portion) 13 larger than the hole 11 is formed on one side (the lower side in FIG. 1) of the die 3 in the axis CL1 direction. The hole 13 has a shape that is slightly larger than the size of the product W7 (hole 11) (when viewed from the direction of the axis CL1, a shape in which an edge having a predetermined slight width ΔC3 is provided on almost the entire periphery of the shape of the hole 11. ).

  In the case of performing shaving, the extrusion is performed when viewed from the direction of the thickness t3 (the direction of the axis CL1 of the punch 1 and the die 3 and the direction of the thickness t1 of the workpiece W) of the predetermined portion W1 subjected to the extrusion. Further, the hole 11 of the die 3 exists inside the predetermined portion W1, and the punch 1 exists inside the hole 11 of the die 3.

  As shown in FIG. 3 (a diagram showing a state in the middle of the shaving process), a clearance angle β may be provided on the cutting edge 9 of the die 3.

  Here, in order to make understanding easier, the product W7 will be described by taking a cylindrical shape (a circular shape when viewed from the thickness direction) as an example.

  The extrusion process is performed in cooperation with a cylindrical punch (not shown) having a diameter slightly larger than the diameter D1 of the part W1 and a die (not shown), and the part W1 formed by extrusion is formed. The diameter D1 is slightly larger than the diameter D7 of the product W7 by a margin for shaving. The concave portion 17 of the workpiece W formed by extrusion processing is slightly larger than the diameter of the punch used in the extrusion processing, and the concave portion 17 has a diameter on the part W1 side (lower side in FIG. 1). It has a small truncated cone shape. The reason for the shape of the truncated cone is that a part of the workpiece W remaining when the extrusion processing is performed protrudes outside the recess 17 and flows. In FIG. 1 and FIG. 2, the truncated cone shape of the recess 17 is exaggerated.

  The shaving process is performed in cooperation with the punch 1 having a diameter D2 slightly smaller than the diameter D7 of the product W7 and the die 3 in which the diameter D11 of the hole 11 is the same as the diameter D7 of the product W7. A hole 13 having a diameter D13 larger than the diameter D11 is formed below the hole 11.

  By the way, as the product W7, a product having a shape viewed from the thickness direction of the product W7 other than a circular shape, for example, a rectangular shape may be processed. In addition, for example, when the product has a shape including a circular portion 21 and an uneven portion 23 as shown in FIG. 4 (views of FIG. 1 and FIG. 2 viewed from the VI direction), the product is complicated. It is desirable that the uneven portion 23 having a smooth shape is processed in advance in another punching process (the through hole h1 is provided).

  According to the manufacturing method of the product W7, in the state where the product W7 is obtained by performing the shaving process after the extrusion process, the product W7 is generated by shaving in the part of the work W from which the product W7 is separated (the remaining part W3 of the work W). Since the chips (continuous shaped chips) W9 are integrally attached (see FIG. 3), the chips W9 do not stick to the product W7, and the chips W9 damage the product W7 conventionally. Can also be reduced. Moreover, since the chip W9 is integrally attached to the remaining portion W3 of the workpiece W, the processing of the chip W9 is facilitated.

  In addition, according to the manufacturing method of the product W7, since the positive rake angle α is provided in the die 3, the plastic deformation on the shearing surface of the chips (chips) W9 as compared with the case where the rake angle α is not provided. The amount can be reduced, and therefore the cutting resistance at the time of shaving (a kind of cutting process) can be reduced, even when the allowance is large, and even if the allowance varies, Moreover, even when processing difficult-to-cut materials, it is possible to prevent the occurrence of cracks and the like due to chips on the cut surface (side surface of the product W7). A cut surface can be obtained.

  In addition, in order to obtain a high-quality cut surface, it is not necessary to maintain the machining allowance in the shaving process at an accurate value, so there is no need to increase the accuracy of the die where the die is installed and the positioning accuracy of the workpiece. Production costs can be reduced.

  In general, the provision of the positive rake angle α may shorten the life of the cutting edge 9 of the die 3. However, the material of the die 3 is rich in toughness, has hardness, is polished. Servo press for cutting speed (relative speed of punch with respect to die) for further shaving by selecting appropriate wearable material etc. or coating appropriate material on the cutting edge 9 If it controls suitably by using, it can prevent that the lifetime of the cutting blade of die | dye 3 becomes short.

  The value of the positive rake angle α may be appropriately changed within a range of greater than 0 ° and 30 ° or less, for example, in accordance with the material of the workpiece.

It is a figure which shows schematic structure of the principal part of the metal mold | die for manufacturing a product based on embodiment of this invention. It is a figure which shows schematic structure of the principal part of the metal mold | die for manufacturing a product based on embodiment of this invention. It is a figure which shows the state in the middle of shaving process. It is the figure which looked at FIG.1 and FIG.2 from VI direction.

Explanation of symbols

1 Punch 3 Die 9 Cutting edge W Work W1 Part W7 extruded in the extrusion process Product

Claims (2)

An extruding step of extruding a predetermined portion of the plate-like workpiece in the thickness direction of the workpiece;
A shaving process for separating the product from the predetermined part by shaving the part extruded in the extrusion process in cooperation with a punch and a die having a positive rake angle;
A method for producing a product, comprising: A predetermined part of a plate-shaped workpiece extruded in the thickness direction is subjected to shaving in cooperation with a punch, and a product having a predetermined shape having a predetermined thickness is separated from the extruded part. In the die to do
An opening having substantially the same shape as the shape of the product;
A cutting edge formed with a positive rake angle at the periphery of the opening;
A die characterized by comprising:

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