JPH0847713A - Method for manufacturing plate-shaped material - Google Patents

Abstract

PURPOSE:To easily form a plate-like shape which has recessed/-projection lines on the surface of one side into a flat shape and also improve the yield of product by cutting dummy recessed/projection lines into the flat shape after extruding the plate-like shape which has the surface having the recessed/projection lines and the dummy recessed/projection lines on the opposite surface. CONSTITUTION:After extruding the plate-like shape 20 which has the surface having the recessed/projection lines 13 and the dummy recessed/projection lines 14 on the opposite surface, by cutting the dummy recessed/projection lines 14 into the flat shape, the plate-like shape having the recessed/projection lines 14 on the surface of one side is formed into the flat shape. And, by equalizing the surface area of the recessed/projection lines 13 to the surface area of the dummy recessed/projection lines 14, the frictional resistance of metal and flow velocity of metal or the like on the sides of the recessed/projection lines 13 and dummy recessed/projection lines 14 at the bearing of die for extrusion at the time of extruding the plate-like shape are equalized. In this way, the extruded shape having high-accuracy flatness is obtained and cutting accuracy after that is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a plate-shaped material, and more particularly to a method for manufacturing a plate-shaped material having a concavo-convex strip on one surface such as a comb-shaped cross section. It is about the method.

[0002]

2. Description of the Related Art As shown in FIG. 5, a heat sink for forced air cooling, which is used for manufacturing a semiconductor device, has appropriate intervals on opposite surfaces of plate bodies 2 having a heat transfer property and facing each other. In addition, a plurality of grooves 3 are formed, the fins 4 are fitted in the opposing grooves 3, and the projecting wall portions 7 of the grooves 3 are caulked together.

In the heat sink constructed as described above, the inventors have developed a heat sink and a manufacturing method thereof in order to secure the fixing of the plate body 2 and the fins 4 and to improve the heat exchange efficiency (Japanese Patent Application No. 2000-242242). No. 5-127735). As shown in FIGS. 5 to 7, the heat sink includes a caulking portion 5 and fins together with the caulking portion 5 between grooves 3 provided in a plate body 2 made of an extruded profile made of an aluminum alloy. 4 and the fixed wall portion 6 that holds 4 are alternately formed,
After fitting the fins 4 in the groove lines 3, the projecting wall portions 7 of the groove lines 3 are crushed to the fin side by a pressing jig so that the fins 4 are caulked.

[0004]

However, since the plate body 2 used for the heat sink has a substantially comb-shaped cross section and the front and back surfaces are symmetrical, the plate body 2 is extruded using a die. Since there is a difference in the flow velocity and flow rate of the metal passing through the die, friction resistance or temperature,
As shown in FIG. 5, a phenomenon occurs in which the plate body 2 bends toward the surface having the groove 3. For example, the width of the plate 2 is 400
mm, the plate 2 has a thickness of 14 mm, and the groove 3 has a depth of 3 mm.
In the case of No. 1, a bending of about 3 mm occurs. Therefore, there is a problem in that the dimensions between the grooves 3 and the parallelism between the grooves 3 become uneven, the adjacent fins 4 contact each other, the caulking portion becomes insufficient, and eventually the product yield decreases. Further, the same problem occurs in the plate-shaped member having the uneven strip on one surface other than the plate 2 of the heat sink.

The present invention has been made in view of the above circumstances, and it is possible to form a plate-shaped material having a concavo-convex line on one surface into a flat shape, and to manufacture a plate-shaped material that can improve product yield. It is intended to provide a method.

[0006]

In order to achieve the above-mentioned object, a method for manufacturing a plate-shaped material of the present invention is a method for manufacturing a plate-shaped material having a concavo-convex strip on one surface, wherein the concavo-convex strip is provided. The present invention is characterized by including a step of extruding and molding a plate-shaped material having a concave-convex groove for dummy on the surface opposite to the surface and a step of cutting the concave-convex groove for dummy into a flat shape.

In the present invention, the dummy concave-convex strips may be arbitrary provided that they are provided on the side surface opposite to the concave-convex strips, but preferably the surface area of the dummy concave-convex strips is equal to the surface area of the concave-convex strips.

[0008]

According to the present invention, one surface is formed by extruding a plate-shaped member having a concave-convex strip for dummy on the surface opposite to the surface having the concave-convex strip, and then cutting the concave-convex strip for dummy into a flat shape. It is possible to form a plate-shaped material having uneven ridges into a flat shape.

Further, by making the surface area of the uneven strips equal to the surface area of the dummy uneven strips, the metal on the uneven strip side and the dummy uneven strip side in the bearing of the extrusion molding die at the time of extrusion molding of the plate-shaped member Since the frictional resistance and the flow velocity of the metal can be equalized, it is possible to obtain an extruded shape member with high flatness accuracy, and to improve the cutting accuracy thereafter.

[0010]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Here, a case where the plate-shaped member is a plate-shaped member having a groove used for a heat sink will be described.

FIG. 1 is a front view of an extrusion molding die used in the manufacturing method of the present invention, and FIG. 2 is a sectional view of the extrusion molding state.

The bearing 11 provided in the extrusion molding die 10 has an elongated rectangular base hole 12 and a concavo-convex strip 13 continuously connected to one side of the base hole 12 (upper side of FIG. 1). It is constituted by a corrugated dummy concave-convex strip 14 continuously connected to the other side of the base hole 12 (the lower side of FIG. 1). In this case, the concavo-convex strip 13 has a shape in which the caulking portion 5 and the fixed wall portion 6 for holding a fin (not shown) together with the caulking portion 5 are alternately provided between the grooved strips 3. There is. Further, the surface area of the dummy concave-convex strip 14 is formed to be as equal as possible to the surface area of the concave-convex strip 13. The reason is that it is possible to equalize the frictional resistance of the metal and the flow velocity of the metal on the uneven line 13 side and the dummy uneven line 14 side of the bearing 11 of the extrusion molding die 10 at the time of extrusion molding, and the extrusion with high flatness accuracy is possible. This is because the shaped member 20a can be obtained. Therefore, the shape of the dummy concave-convex strip 14 does not necessarily have to be a wavy shape.
You may make it the same shape as the shape of 3.

When the profile 20a is extrusion molded using the extrusion molding die 10 formed as described above, first, the extrusion molding die 10 formed as described above is used.
Is attached to the front side of the container 30 of the extruder shown in FIG. Then, when the heated billet 31 inserted in the container 30 is pressed by the stem 32 toward the die 10, the billet, that is, the metal passes through the bearing 11 of the die 10 having the above-described shape and the uneven strip 13 is formed on one surface. Then, the profile 20a having a shape having the dummy concave-convex strip 14 on the other surface is formed.

The profile 2 extruded as described above
In order to obtain the plate-shaped profile 20 from 0a,
3 is set in a milling machine (not shown), the profile 20a is horizontally moved and the milling blade 40 is vertically moved and adjusted as shown in FIG. 14 is cut into a flat shape (see FIG. 4).

After the shape member 20a having the uneven strips 13 and the dummy uneven strips 14 is extruded and molded as described above, the dummy uneven strips 14 are cut into a flat shape by milling to obtain the plate-like shaped member 20. Since the concavo-convex line 13, specifically the groove line 3, the caulking portion 5, and the fixed wall portion 6 are formed in parallel with each other, the fins (not shown) can be caulked and fixed in parallel.

In the above embodiment, the case where the plate-shaped member is a plate member having a groove used for a heat sink has been described. Similarly, the plate-shaped material used for can be extruded.

[0017]

As described above, according to the present invention, after the plate-shaped member having the uneven ridge for dummy on the surface opposite to the surface having the uneven ridge is extruded, the uneven ridge for dummy is flattened. Since the cutting is performed, it is possible to easily form a plate-shaped material having a concavo-convex strip on one surface into a flat shape and improve the product yield.

Further, by equalizing the surface area of the uneven strip and the surface area of the dummy uneven strip, the metal on the uneven strip side and the dummy uneven strip side in the bearing of the extrusion molding die at the time of extrusion molding of the plate-shaped member Since the frictional resistance and the flow velocity of the metal can be equalized, it is possible to obtain an extruded shape member with high flatness accuracy, and to improve the cutting accuracy thereafter.

[Brief description of drawings]

FIG. 1 is a front view of an extrusion molding die used in a manufacturing method of the present invention.

FIG. 2 is a cross-sectional view showing an extrusion molding state.

FIG. 3 is a perspective view showing a cut state of a dummy uneven strip.

FIG. 4 is a schematic sectional view of a plate-shaped member.

FIG. 5 is a front view of a heat sink.

FIG. 6 is an enlarged cross-sectional view showing a state where the plate of the heat sink and the fins are attached.

FIG. 7 is an enlarged cross-sectional view showing a caulking portion of the plate body of the heat sink.

FIG. 8 is a schematic sectional view of a conventional plate-shaped member.

[Explanation of symbols]

 10 Extrusion Molding Die 11 Bearing 12 Base Hole 13 Uneven Line 14 Uneven Line for Dummy 20 Plate Shaped Material 20a Extruded Shaped Material 40 Milling Blade

Claims (2)

[Claims] 1. A method of manufacturing a plate-shaped material having a concavo-convex strip on one surface, the step of extruding a plate-shaped material having a concavo-convex strip for dummy on the surface opposite to the surface having the concavo-convex strip, And a step of cutting the dummy concave-convex strip into a flat shape. 2. The method for manufacturing a plate-shaped material according to claim 1, wherein the surface area of the uneven strip and the surface area of the dummy uneven strip are equal.