JPH0588721U - Molding die - Google Patents

Abstract

(57) [Summary] [Purpose] Properly removes burr that occurs during soft metal punching in a short time. [Structure] A metal plate 2 having an elastic layer 1 formed on at least one surface thereof is punched to form a through hole 4, and this work W
It is a mold for finish molding. One of the molds 7 is formed with a step 6 having a flat surface 10 projecting from the general surface 5 and substantially orthogonal to the punching direction Z at a position relative to the peripheral edge of the through hole 4. The other die 9 moves toward and away from the die 7 relatively, and is formed with a pressing surface 8 that presses the work W in cooperation with the general surface 5 of the die 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 TECHNICAL FIELD The present invention relates to a molding die, and more particularly to a molding die for finishing a burr which is generated when a metal plate material having an elastic layer is punched.

[0002]

[Prior Art]

 For example, in the case of seal packings and gaskets for fluid devices such as oil and air, or body base plates such as electric appliances for home use, a thin layer is formed by coating the surface of a metal plate with an elastic material such as rubber, plastic, or paper. After being formed, the properties of this elastic body are used to improve the sealing properties of seal packings and gaskets, and to improve the feel of household electric appliances. A metal plate having an elastic layer formed on such a surface is called a soft metal and varies depending on the application. For example, it is used in a hydraulic circuit of a torque converter of an automobile transmission (especially automatic transmission). In the separate plate used, the thickness of 0.05 to 0. A soft metal to which 06 mm paper is attached is used. In addition, in order to further enhance the sealing performance of the hydraulic circuit of the torque converter, the development of soft metal in which the surface of a metal plate is coated with a rubber material is underway.

By the way, various through holes such as a bolt through hole for attaching the separate plate and an oil through hole are opened in the separate plate of the torque converter described above. Such through-holes are formed by forming an elastic layer on the surface of the metal plate and then punching it out, or after forming the through holes in the metal plate and the elastic body, respectively, pasting both together. Although the attachment method was used, the latter method, that is, the method in which the metal plate and the elastic body are punched separately and then bonded together, positions the through holes of each other with high accuracy. Had to do. Therefore, it can be said that it is a preferable method from the viewpoint of productivity that the elastic layer is first formed on the metal plate and the punching process is performed in this state. Therefore, as shown in FIG. 4, the original plate 3 on the surface of which the elastic layer 1 is formed is placed on the die 11, and the original plate 3 is grasped by the die 11 and the pressing pad 12, and the shape of the through hole 4 is formed. The punching process was carried out by bringing the punch 13 corresponding to the above into close proximity and further pushing the punch 13 into the punch through hole 14 formed in the die 11.

[0004]

[Problems to be solved by the device]

 However, there has been a problem that the above-mentioned punching process causes a burr B for pulling back the metal plate 2 on the side of the elastic body layer 1 which becomes the sealing surface (see FIG. 5). If such burr of removal occurs, for example, a gap may be created on the sealing surface of the seal packing or gasket, or the body base plate of household electric appliances may have a poor feeling of touch and may damage the human body. There was also. Therefore, conventionally, after the punching process for opening the through hole 4 is performed, the polishing finish is performed in order to remove the barriness B of the punching back. However, such polishing finishing work is performed for the through hole to be opened. The larger the number, the more complicated and more time-consuming the work was.

The present invention has been made in view of the above problems of the prior art, and it is an object of the present invention to appropriately remove a burr in a return process, which occurs in a soft metal punching process, in a short time.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the forming die of the present invention is a die for forming a through hole by punching a metal plate having an elastic layer on at least one side and performing finish forming on this work. And a die having a step portion formed at a position relative to the peripheral edge of the through hole, the step portion having a flat surface projecting from the general surface and being substantially orthogonal to the punching direction of the punching process, and a die relative to the die. And a mold having a pressing surface that presses the work in cooperation with the general surface of the mold.

[0007]

[Action]

 When a metal plate having an elastic layer formed on at least one surface is punched to open a through hole, sharp burr is formed on the periphery of the through hole in the direction of drawing. According to the present invention, after this punching process, a die having a step portion having a flat surface projecting from the general surface and substantially orthogonal to the pulling direction is formed at a position with respect to the periphery of each through hole, and the die. The metal plate is set between the metal plate and the mold on which the pressing surface for pressing the metal plate is formed in cooperation with the general surface of the metal plate, and both the molds are brought close to each other. As a result, the burr formed on the periphery of the through hole is removed by being pressed by the flat surface of one mold and the pressing surface of the other mold. Also, if a plurality of step portions are formed in one of the molds in accordance with the through holes formed in the metal plate, the burr for removal can be removed with one stroke.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1A is a cross-sectional view showing a punching die for forming a through hole in a soft metal, FIG. 1B is a cross-sectional view showing a forming die according to an embodiment of the present invention, and FIG. 2 is the same. FIG. 3 is an enlarged cross-sectional view showing a main part of the molding die of the embodiment, and FIG. 3 is a cross-sectional view showing a work after finishing by the molding die of the embodiment.

First, a soft metal that is subjected to finishing using the molding die of this embodiment will be described. The so-called soft metal is formed by forming a material layer having elasticity such as paper, rubber, synthetic resin, etc. on one or both sides of a metal plate. In the soft metal of this embodiment, the plate thickness is 0.8 to 1. An elastic layer 1 having a thickness of, for example, 0.05 to 0.06 mm is formed by coating a rubber material on the entire one surface of a 4 mm steel plate (metal plate) 2. The elastic layer 1 is used as a sealing surface and is used as, for example, a seal plate or a gasket, or the elastic layer 1 is used as a surface and is used as a body base plate for household electric appliances and the like. Since this embodiment is one specific example for explaining the molding die of the present invention, for example, the material forming the metal plate 2 is not limited to steel, and a metal such as aluminum may be used. Is also possible. Further, the elastic layer 1 formed on the surface of the metal plate 2 is not limited to rubber and may be any material having high elasticity. Furthermore, the thicknesses of the metal plate 2 and the elastic layer 1 are not limited to the above numerical values.

In order to use such a soft metal original plate 3 as a product such as a seal plate and a gasket, it is necessary to open through holes 4 such as bolt insertion holes and fluid flow holes. It is performed by the punching die shown in (A). This punching die includes a lower die (die) 11 fixed to a base (not shown), and an upper die (punch) 13 fixed to a ram (not shown) that moves up and down with respect to the base. The upper mold 13 is composed of a punch corresponding to the shape of the through hole 4. Further, a pressing pad 12 for pressing and fixing the original plate 3 is attached to the ram, while a machining flat surface 11a of the lower die 11 is formed with a hole 14 through which a punch 13 as an upper die is inserted. ing. Then, the original plate 3 is placed on the processing flat surface 11a of the lower die 11, and when the ram is lowered, first, the pressing pad 12 attached to the ram presses the original plate 3 and thereby the original plate 3 Positioning is performed. When the ram is further lowered, the punch 13 as the upper die punches out the original plate 3 and inserts it into the hole 14 in the lower die. As a result, the soft metal original plate 3 can be provided with the through holes 4 of a predetermined shape and quantity.

In the work in which the through holes 4 have been formed in this manner, the burr B for withdrawing described with reference to FIG. 5 has occurred. The burr B that has been removed is caused by the shearing force between the punch 13 of the die for drawing and the hole 14 of the lower die shown in FIG. Sharpened towards. Further, even if punching is performed, the elastic layer 1 can maintain the thickness of the original plate 3 due to its own elasticity (restoring force), while the burr B that has been punched out protrudes from this elastic layer 1. Not a few (see Figure 5). The molding die of this embodiment is configured such that the burr B that has been removed is crushed so as not to project from the elastic layer 1, and that the crushing does not impair the flatness of the elastic layer 1. ..

That is, as shown in FIG. 1B, the molding die of this embodiment has an upper mold 9 and a lower mold 7. For example, the lower mold 7 is fixed to a base and the upper mold is fixed. When the ram 9 is fixed to the ram and the ram moves up and down with respect to the base, the upper die 9 and the lower die 7 move relatively toward and away from each other (the ram and the base are not shown). To). The lower die 7 is formed with a convex portion 15 corresponding to the through hole 4 opened in the work W. For example, the through hole 4 of the work W is inserted into the convex portion 15 for positioning. As shown in FIG. 2, the tip of the convex portion 15 is cut off, so that the upper die 9 described later can be smoothly inserted into the hole 16. A step portion 6 is formed at a position corresponding to the peripheral edge of the work W at the base end of the convex portion 15, and the step portion 6 is substantially perpendicular to the drawing direction Z (that is, in the drawing). 1 (B) and in FIG. 2 a substantially flat surface 10 is formed.

As shown in FIG. 2, the flat surface 10 has a width K at least slightly larger than the width dimension L of the burr B to be removed and a height H set to be equal to the thickness t of the elastic layer 1. Is preferred. For example, in the present embodiment, when the burr width L of the punching back generated on the work W is 0.1 mm and the thickness t of the elastic layer 1 is 0.05 mm, the stepped portion 6 shown in FIG. K is 0.2 to 0.3 mm and H is 0.05 mm. When K of the step portion 6 is set to be larger than the burr width L, the step portion 6 and the upper die pressing surface 8 also partly clamp the elastic layer 1, but the elastic layer 1 is restored by its own elasticity. There is no possibility that the sealing property of the peripheral edge of the through hole 4 may deteriorate. It should be noted that the specific numerical values of the stepped portion 6 and the flat surface 10 may be appropriately selected depending on the specifications of the work W to be finished and various conditions such as the shape of the through hole 4. The general surface 5 located around the convex portion 15 of the lower die 7 is formed flat, and has a function of holding the work W in cooperation with a pressing surface 8 of the upper die 9 described later.

The upper die 9 according to this embodiment mainly holds the work W in cooperation with the general surface 5 of the lower die 7 described above, and the surface corresponding to the stepped portion 6 of the lower die 7 is It has a pressing surface 8 that cooperates with the step portion 6 to crush the burr B that has been removed. Further, a hole 16 through which the convex portion 15 of the lower mold 7 is inserted is formed. The pressing surface 8 of the upper die 9 is not limited to the structure shown in FIG. 1 (B), and at least cooperates with the flat surface 10 of the step portion 6 of the lower die 7 to remove the burr. It is only necessary to press B. Therefore, in order to hold the work W, it is possible to separately provide a pressing pad.

Next, the operation will be described. Using the punching die shown in FIG. 1A, the soft metal (original plate) 3 having the elastic layer 1 formed on one surface is punched to open the through holes 4. At the periphery of No. 4, sharp burr B is formed in the punching direction. After the through hole 4 is opened, the work W is set in the lower mold 7 so that the elastic layer 1 side contacts the lower mold 7 (see FIG. 2), and then the upper mold 9 is lowered. The convex portion 15 formed on the lower die 7 starts to be inserted into the hole 16 formed in the upper die 9, and at the same time, the pressing surface 8 of the upper die 9 presses the upper surface (metal plate surface) 2 of the work W.

At this time, in the lower mold 7 of this embodiment, a step portion 6 having a flat surface 10 projecting from the general surface 5 and substantially orthogonal to the drawing direction Z is formed at a position relative to the peripheral edge of each through hole 4. Therefore, the burr B formed on the periphery of the through hole 4 is pressed and crushed by the flat surface 10 of the lower die 7 and the pressing surface 8 of the upper die 9. Since the lower die 7 is formed with a plurality of step portions 6 corresponding to the through holes 4 formed in the work W, the burr for removal can be removed by the one-stroke molding described above. In the work W finished in this way, as shown in FIG. 3, the burr B that has been removed is removed, and the elastic layer 1 becomes flat. For example, when it is used for a seal packing, a gasket, etc. The action of the body will improve the sealing performance. In addition, when used as a body base plate for household electric appliances, etc., the feeling of touch becomes a soft touch and there is no possibility of damaging the human body.

The molding die of the present invention can be variously modified without being limited to the above-mentioned embodiments. For example, the mold for forming the step is not limited to the lower mold, but may be formed in the upper mold. The upper mold and the lower mold may move relative to each other as long as they are moved relative to each other, and the upper mold may be fixed and the lower mold may be moved. Further, the work may be set by the upper mold or the lower mold.

[0018]

[Effect of the device]

 The molding die of the present invention includes a die having a step portion formed at a position relative to the peripheral edge of the through hole, the step portion having a flat surface protruding from a general surface and being substantially orthogonal to the punching direction of the punching process. It moves relatively toward and away from the mold, and because it has a mold with a pressing surface that presses the work in cooperation with the general surface of the mold, it occurs when opening a through hole. Burrs can be removed in a single stroke, eliminating the need for long hours of work such as conventional polishing. Therefore, even if the soft metal is applied to the sealing material such as the seal packing and the gasket, there is no possibility that a gap due to the burr is generated on the sealing surface. In addition, even if soft metal is applied to a body base plate such as a household electric appliance, the touch feeling is improved and there is no risk of damaging the human body.

[Submission date] June 21, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

[Prior Art]

 For example, in the case of seal packings and gaskets for fluid devices such as oil and air, or body base plates such as household electrical appliances, rubber or plastic is applied to the surface of the metal plate.ElasticityA thin layer is formed by coating a material that has It is being appreciated. A metal plate having an elastic layer formed on such a surface is called a soft metal and varies depending on the application. In the separate plate used, the surface of a metal plate with a thickness of 0.8 to 1.4 mm isThickness about 0.2mm The method of sandwiching or adhering the above papers at the same time is used.  In addition, In order to further improve the sealing performance of the hydraulic circuit of the Luk converter, the development of soft metal in which the surface of the metal plate is coated with a rubber material is underway.

[Brief description of drawings]

FIG. 1A is a sectional view showing a die for punching for forming a through hole in a soft metal, and FIG. 1B is a sectional view showing a forming die according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a main part of the molding die of the embodiment.

FIG. 3 is a cross-sectional view showing a work after finishing with the forming die of the embodiment.

FIG. 4 is a cross-sectional view showing a conventional die for punching.

FIG. 5 is a cross-sectional view showing a burr of a pulling back which occurs on the periphery of the through hole after the punching process.

[Explanation of symbols]

 W ... Work Z ... Drawing direction K ... Step width H ... Step height L ... Pull-back burr width t ... Elastic layer thickness 1 ... Elastic layer 2 ... Metal plate 3 ... Original plate 4 ... Through Hole 5 ... General surface 6 ... Step 7 ... Lower mold (mold) 8 ... Pressing surface 9 ... Upper mold (mold) 10 ... Flat surface 11 ... Lower mold (die) 11a ... Processing flat surface 12 ... Pressing pad 13 ... Upper mold (punch) 14, 16 ... Hole 15 ... Convex part

Claims (1)

[Scope of utility model registration request] 1. A mold for punching a metal plate (2) having an elastic layer (1) formed on at least one surface to open a through hole (4), and finishing-molding the work (W). A step portion (6) having a flat surface (10) projecting from the general surface (5) at a position relative to the peripheral edge of the through hole (4) and being substantially orthogonal to the punching direction (Z) of the punching process. And the mold (7) having the mold (7) formed thereon, moving toward and away from the mold (7) relatively, and in cooperation with the general surface (5) of the mold (7). ) And a die (9) having a pressing surface (8) formed thereon.