Manufacturing method for metal processed products

Abstract

A method for manufacturing a metal processed product is provided for manufacturing a metal processed product that can ensure desired performance. [Solution] A manufacturing method for a metal processed product includes a groove forming process in which a metal body 10 having a resistive material 1 and an electrode material 2 laminated on the resistive material 1 is provided with a plurality of grooves 3 by cutting the electrode material 2, a rolling process in which the metal body 10 is rolled with a shape-retaining member 4 provided in each of the plurality of grooves 3, and a shape-retaining member removal process in which the shape-retaining member 4 is removed after the rolling process.

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing a metal processed product. [Background technology]

[0002] Conventionally, methods for manufacturing metal processed products such as shunt resistors and shaped materials for connectors have been disclosed. Shunt resistors are often configured by forming a recess between one electrode and the other electrode, and the accuracy of forming the recess is important to ensure the accuracy of the resistance value. To date, methods for manufacturing shunt resistors with recesses have been disclosed in, for example, Patent Document 1 and Patent Document 2.

[0003] The manufacturing method of the shunt resistor described in Patent Document 1 includes a joining process in which a first electrode metal plate made of a copper alloy is laminated on a resistive alloy made of a nickel alloy or the like, and a second electrode metal plate made of an aluminum alloy or the like is laminated on the surface opposite the joining surface of the resistive alloy, and the laminated and joined; and a removal process in which a predetermined area of ​​the first electrode metal surface and a predetermined area of ​​the second electrode metal surface are removed by cutting. The method for manufacturing a shunt resistor described in Patent Document 2 involves brazing a copper plate to at least one surface of a resistive metal plate, removing the oxide film from the surface, forming a tin plating film over the entire surface of the copper plate to form an aggregate multilayer plate, cutting the aggregate multilayer plate into strips of a desired width, cutting a predetermined width along the long side from approximately the center of the short side direction of the surface of the strip-shaped multilayer plate on which the tin plating film is formed, removing the tin plating film, the copper plate, the brazing material, and at least the diffusion layer between the resistive metal plate and the brazing material by cutting to form a recess, forming a protective film on the bottom surface of the recess, and then cutting the strip-shaped multilayer plate into chips of the desired width. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-57010 A [Patent Document 2] JP 2009-194316 A Summary of the Invention [Problem to be solved by the invention]

[0005] As in the inventions described in Patent Documents 1 and 2, when manufacturing a metal processed product having a recess, the recess is formed by removing a predetermined area by cutting. However, when using a cutting method, it is difficult to adjust the cutting depth, and cutting takes time, so it is difficult to manufacture a metal processed product such as a shunt resistor that has the desired performance in a short time. In addition, metal processed products that do not have the desired performance are discarded, which creates a problem of costs.

[0006] An object of the present invention is to provide a method for manufacturing a metal processed product that can ensure desired performance. [Means for solving the problem]

[0007] The manufacturing method of the present invention for manufacturing a metal processed product is characterized in that it includes a metal body having a first metal body and a second metal body laminated on the first metal body, and includes a groove forming process in which a plurality of grooves are formed by cutting the second metal body, a rolling process in which the metal body is rolled with shape-retaining members respectively provided in the plurality of grooves, and a shape-retaining member removal process in which the shape-retaining members are removed after the rolling process.

[0008] The manufacturing method for a metal processed product according to the present invention is characterized in that the shape-retaining member is made of metal, and in the rolling process, the shape-retaining member is rolled while being inserted into the groove portion so that the lower surface of the shape-retaining member abuts the bottom of the groove portion and the side surface of the shape-retaining member abuts the second metal body. Effect of the Invention

[0009] In the manufacturing method of the metal processed product according to the present invention, rolling is performed with a shape-retaining member inserted in the grooves formed in the cutting process, and then the shape-retaining member is removed, so that in the metal body after rolling, the unevenness of the bottom of the grooves formed by cutting is extremely small, and the desired shape can be maintained. Therefore, by the manufacturing method of the metal processed product according to the present invention, resistors and the like that ensure the desired performance can be manufactured. Furthermore, in the manufacturing method of the metal processed product according to the present invention, a shape-retaining member is inserted into each of the multiple grooves, and after rolling, these shape-retaining members are removed. Therefore, a single metal body having multiple grooves formed therein can be manufactured. [Brief description of the drawings]

[0010] [Figure 1] 1A and 1B are diagrams for explaining a metal body manufacturing step in a manufacturing method for a metal processed product according to an embodiment of the present invention. [Diagram 2] 1 is a diagram for explaining a cutting step of a manufacturing method for a metal processed product according to an embodiment of the present invention; [Diagram 3] FIG. 2 is a diagram for explaining a rolling step of a method for manufacturing a metal processed product according to an embodiment of the present invention. [Figure 4] 1 is a diagram for explaining a shape-retaining member removing step in the manufacturing method for a metal processed product according to an embodiment of the present invention; [Diagram 5] 1 shows a diagram of a metal workpiece produced by a method for manufacturing a metal workpiece according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The manufacturing method of a metal processed product according to the present invention is used for manufacturing a metal processed product used for a resistor chip, a connector, etc. Hereinafter, the manufacturing method of a metal processed product according to the present embodiment will be described with reference to Figs. 1 to 5.

[0012] The manufacturing method for a metal processed product in this embodiment includes a metal preparation process for preparing a metal body 10 having a resistive material (first metal body) 1 and an electrode material (second metal body) 2 stacked on the resistive material 1, as shown in Figures 1 to 3, a groove formation process for forming multiple grooves 3 by cutting the electrode material 2, a rolling process for rolling the metal body 10 with a shape-retaining member 4 provided in each of the multiple grooves 3, a shape-retaining member removal process for removing the shape-retaining member 4 after the rolling process, and a heat treatment process for heat-treating the metal body 10 after the rolling process. In the following description, the metal body 10 in FIG. 1 is taken as a reference, with the short side direction being the left-right direction X, the long side direction being the front-back direction Y, and the height direction being the up-down direction Z.

[0013] Each step of the method for manufacturing a metal processed product according to this embodiment will be described below.

[0014] [Metal body manufacturing process] In the metal body fabrication process, a metal body 10 is fabricated using a resistance material 1 and an electrode material 2. Specifically, the electrode material 2 is laminated on the upper side of the resistance material 1 in the vertical direction Z, and clad processing is performed. In this manner, a metal body 10 in which different metal materials are bonded together is fabricated. The resistance material 1 and the electrode material 2 are made of rectangular, long metal, and the resistance material 1 and the electrode material 2 are made of metal of the same size. The size of these metal bodies 10 can be changed as appropriate depending on the purpose. In addition, the method of bonding different metal materials together is not limited to clad processing, and other methods may be used.

[0015] The resistor material 1 may be made of, for example, a copper alloy (86% copper, 12% manganese, 2% nickel), a nickel alloy (57% or more nickel, containing chromium, iron, and manganese), or nichrome. The electrode material 2 may be made of, for example, pure copper. The resistive material 1 and the electrode material 2 are not limited to the above metals and can be selected appropriately.

[0016] [Groove formation process] In the cutting process, multiple grooves 3 are formed in the metal body 10. Specifically, a cutting device cuts the electrode material 2 to form multiple grooves 3 along the front-rear direction Y (FIG. 2). At this time, cutting is continued until the bottom of the grooves 3 becomes the resistance material 1. Therefore, unevenness is formed at the bottom of the grooves 3. After cutting, the sides of the grooves 3 are made of the electrode material 2, and the bottom of the grooves 3 is made of the resistance material 1. The width of the grooves 3 in the left-right direction X is, for example, 0.5 mm to 50 mm.

[0017] [Rolling process] After producing the metal body 10 with the grooves 3 formed therein, as shown in Fig. 3, a metallic shape-retaining member 4 is provided in the grooves 3, with the lower surface of the shape-retaining member 4 abutting against the bottom of the grooves 3 and the side surface of the shape-retaining member 4 abutting against the electrode material 2. This shape-retaining member 4 functions as a dummy material for retaining the desired shape of the grooves 3 after the rolling process. The shape-retaining member 4 is approximately the same size as the grooves 3, and with the shape-retaining member 4 inserted into the grooves 3, the upper surface of the metal body 10 becomes approximately flat.

[0018] The shape-retaining member 4 may be made of a material having work hardening similar to that of the resistance material 1, such as stainless steel, iron alloy, or copper alloy, and is appropriately selected according to the metals of the resistance material 1 and the electrode material 2. In this embodiment, a stainless steel shape-retaining member 4 is used. Note that the resistance material 1 becomes hardened by rolling, so the above-mentioned work hardening similar to that of the resistance material 1 means a property of becoming hardened by rolling in the same way as the resistance material 1.

[0019] The rolling step is performed by a rolling device equipped with upper and lower rollers, and the metal body 10 is pressed from the vertical direction Z at room temperature while the shape-retaining member 4 is inserted into the groove portion 3. During this time, the upper roller simultaneously presses the electrode material 2 and the shape-retaining member 4. After the rolling step, a rolled metal body 10 is produced as shown in FIG. 4(a).

[0020] [Shape retaining material removal process] After the rolling step, a shape-retaining member removal step is performed. In this shape-retaining member removal step, the shape-retaining members 4 are removed from the multiple grooves 3 of the rolled metal body 10, as shown in FIG. 4(b). The shape-retaining members 4 are removed by the manufacturer by hand or using a machine along the front-rear direction Y of the metal body 10. By removing the shape-retaining members 4, a metal body 10 is produced in which grooves 3 of a desired shape are formed, as shown in FIG.

[0021] [Heat treatment process] After the shape-retaining member removal process, a heat treatment process is performed. In this heat treatment process, the metal body 10 is heat-treated to adjust the material properties, such as strength, to the desired properties. By performing the heat treatment, the metal structure constituting the resistor material 1 and the electrode material 2 can be made uniform.

[0022] Next, the effects of the method for manufacturing a metal processed product according to this embodiment will be described.

[0023] In the manufacturing method of the metal processed product according to this embodiment, rolling is performed with the shape-retaining member 4 inserted in the groove portion 3, and then the shape-retaining member 4 is removed. By doing so, in the metal body 10 after rolling, the unevenness of the bottom of the groove portion 3 formed by cutting becomes extremely small, and the desired shape is maintained. Therefore, the manufacturing method of the metal processed product can manufacture resistors and the like that ensure the desired performance.

[0024] In the manufacturing method of a metal processed product according to this embodiment, a shape-retaining member 4 is inserted into each of the multiple grooves 3, and after rolling, these shape-retaining members 4 are removed. This makes it possible to manufacture a single metal body 10 having multiple grooves 3 formed therein. Furthermore, since the width and size of the grooves 3 can be determined by the cutting conditions, multiple grooves 3 of desired widths and sizes can be formed in the metal body 10.

[0025] Although the present embodiment has been described above, it is possible to select from the configurations given in the above embodiment, or to change to other configurations as appropriate, without departing from the spirit of the present invention.

[0026] In this embodiment, two types of metal bodies are stacked, but three or more types of metal bodies may be stacked to form a metal body with three or more layers. In the manufacturing method of the metal processed product according to the present invention, the heat treatment step is not essential, and the heat treatment step does not have to be performed after the shape-retaining member removal step. The metal body 10 having the multiple grooves 3 formed therein may be cut to a desired size. The cross-sectional shape of the grooves 3 to be formed is not limited to a rectangular shape, and for example, triangular grooves may be formed.

[0027] The manufacturing method for metal processed products according to the present invention has been described above. This manufacturing method can be used for the production of a wide variety of products in small quantities, and can produce desired metal processed products at low cost. [Explanation of symbols]

[0028] 1 Resistance material (first metal body) 2 Electrode material (second metal body) 3 Groove 4. Shape retention material 10 Metal body X Left / right direction Y Front-rear direction Z vertical direction

Claims

1. a groove forming step of forming a plurality of grooves in a metal body having a first metal body and a second metal body laminated on the first metal body by cutting the second metal body; a rolling step of rolling the metal body in a state where shape-retaining members are provided in each of the plurality of grooves; A shape-retaining member removing step of removing the shape-retaining member after the rolling step. A method for manufacturing a metal processed product comprising the steps of:

2. The shape-retaining member is made of metal, In the rolling step, the shape-retaining member is rolled while being inserted into the groove so that the lower surface of the shape-retaining member abuts on the bottom of the groove and the side surface of the shape-retaining member abuts on the second metal body. The method for manufacturing a metal processed product according to claim 1 .

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