JPH11104746A - Concave portion forming method on metal plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a concave portion on one face of a metal plate wherein a desired shape of the concaved portion can be made without causing a big stress to the metal plate by the formation of the concaved portion. SOLUTION: In this method, a given shape of concaved portion 2, with a depth shallower than the thickness of the metal, is press-formed by a press and the like from one face 1a side of the metal plate 1 of a given thickness. At the same time, a convex portion 3 is protrudedly formed on other face 1b side of the metal plate 1 and, the metal of the concaved portion 2 is transferred. Thereafter, the convexed portion 3 on the other face 1b side is cut by a cutting processing, and then, the concaved portion 2 is formed on one face 1a side of the metal plate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a concave portion having a predetermined shape on one surface side while flattening the other surface side of a metal plate. The present invention relates to a method for forming a concave portion in a metal plate for forming a concave portion in a metal plate by processing.

[0002]

2. Description of the Related Art As a method for forming a concave portion having a predetermined shape on one surface of a metal plate, a pressing method or a chemical etching method shown in FIG. 8 is known. FIG. 8 shows a normally employed pressing process, in which a press punch 53 is pressed from one side shown above a metal plate 50 having a predetermined plate thickness t0.
Is pressed downward in the direction of the arrow, and a concave portion 51 having a predetermined shape is formed in the metal plate 50 so as to leave the plate thickness t1 on the bottom portion 52.

As another processing method, a concave portion is formed on one side of a metal plate by a generally known chemical etching process.

[0004]

However, in the above-mentioned conventional method, the pressing process by the press shown in FIG. 8 is performed by pressing with a punch 53 to form a concave portion 51 of a predetermined shape in the metal plate 50. 51 volume of metal is pushed into the bottom and the periphery, the composition of the surrounding metal part is compressed and becomes residual stress, and the surrounding metal part curls in the direction of the arrow, and the flatness is significantly impaired. Would. Further, the metal plate 50 is pressed by the depression 51.
And the flatness deteriorates to a state where correction is impossible. As a result, due to the influence of the residual stress, the concave portion 51 is distorted with the lapse of time, and in particular, the dimensions are changed, which may cause a serious quality problem. In addition, since the metal composition changes, for example, when this metal plate is used for a package of an integrated circuit, the thermal conductivity is reduced, so that there is a problem that desired performance cannot be obtained. Further, in order to press the concave portion 51, a large pressing force is required, a high-output press machine is required, and the durability of the punch 53 deteriorates, and the frequency of replacing the punch 53 increases. There is also a problem that the cost is inevitably high.

On the other hand, the chemical etching method requires a long etching time because a metal is chemically dissolved from one surface of a metal plate to form a concave portion, and is not suitable for mass production. Yes, there is a problem that costs are inevitably increased. Further, since the dissolution cannot be controlled for each part in the etching process, there is a problem that dimensional accuracy is deteriorated and practical use is limited.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional method, and a concave portion formed on one surface of a metal plate can be formed into an arbitrary shape. It is an object of the present invention to provide a method for forming a concave portion on a metal plate that can form a concave portion without applying a large stress to the metal plate.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a metal plate having a predetermined thickness is provided with a recess having a predetermined shape which is shallower than the dimension of the thickness from one side. Pressing and forming with a press or the like, and projecting a convex portion on the other surface side of the metal plate to transfer the metal of the concave portion,
The convex portion on the other surface side is cut by cutting to form a concave portion on one surface side of the metal plate.

According to a second aspect of the present invention, there is provided a method of forming a concave portion in a metal plate, wherein a concave portion having a predetermined shape which is shallower than the plate thickness is formed by pressing from one surface side of the metal plate, and the concave portion is formed on the other surface side. It is characterized in that a slightly smaller similar convex portion is formed, and this convex portion is cut by cutting.

According to a third aspect of the present invention, there is provided a method for forming a concave portion in a metal plate, the method comprising the steps of: forming a concave portion from one side of the metal plate; and cutting the convex portion on the other side by cutting. It is characterized in that a concave portion of a predetermined shape is formed gradually by repeating the process.

Further, according to a fourth aspect of the present invention, there is provided a method for forming a concave portion in a metal plate, wherein the concave portion is formed by pressing the concave portion from one side of the metal plate, and the convex portion on the other side is divided and cut a plurality of times. The method is characterized in that the convex portion is gradually cut.

Furthermore, in the method of forming a concave portion in a metal plate according to the present invention, a large number of columnar convex portions formed of a prism, a cylinder, a bank, or a different shape are formed on the other surface of the metal plate. It is characterized in that the columnar convex portion is cut by cutting.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a forming method of the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 shows an example of a final product formed by a method for forming a concave portion in a metal plate according to the present invention, for example, for storing an integrated circuit chip in a concave portion and radiating heat generated from the integrated circuit. Shows the package. This package has a relatively good thermal conductivity and is made of a metal material such as aluminum or copper that can be subjected to plastic working. As shown in FIG. A rectangular recess 2 is formed, and a bottom 1c having a predetermined thickness is formed at a position corresponding to the recess 2 on the other surface 1b side.

Next, a method of forming the concave portion of the package will be described with reference to FIG. FIGS. 2A to 2G show the metal plate 1.
A concave portion 2 of a predetermined shape is formed by pressing from one surface 1a side, and a similar convex portion 3 slightly smaller than the concave portion 2 is formed on the other surface 1b side, and the convex portion 3 is cut by cutting.
A method for forming the other surface 1b side flat is shown.

First, as a material of the metal plate 1 shown in FIG. 2A, a metal plate 1 having a relatively good thermal conductivity, such as copper or aluminum, is selected. FIG. 2B shows a first pressing step. That is, the metal plate 1 is placed in a state where the metal plate 1 is positioned with respect to the die 4 of a press (not shown).
The shallow concave portion 2a is formed by the punch 5 mounted on the press machine from the one surface 1a side. By this pressing, the metal of the concave portion 2a transfers to the other surface 1b side of the metal plate 1, and as a result, the convex portion 3a having a height C substantially equal to the depth of the concave portion 2a is formed on the other surface 1b side of the metal plate 1. A protrusion is formed. The outer dimension Ld of the convex portion 3a is a similar shape slightly smaller than the inner diameter Lu of the concave portion 2.

When such a dimensional relationship is set, for example, even when the concave portion 2a is deeply pressed, the connected state is always maintained without cutting the base end of the convex portion 3a from the metal plate 1. Further, it is desirable that the protruding height C of the convex portion 3a is set to a height that can be cut with a minimum stress in a cutting step described later.

FIGS. 2C and 2D show a first cutting step, in which the other side 1 of the metal plate 1 is formed by the first pressing step.
The protrusion 3a formed on the b side is cut from the base end by the cutter 6 so as to be flush with the other surface 1b. The cutter 6 used in the cutting step has, for example, as shown in FIG. 4, an arrow-shaped tooth portion 6 a protruding at the center of the tip,
With the tip of the tooth portion 6a aligned with the center line of the projection 3a, the cutter 6 is advanced in the direction of the arrow shown in FIG. 2C, and the rear end of the projection 3a shown in FIG. Cutting is completed by proceeding to. In this cutting step, it is desirable to insert and press the pressing tool 7 into the concave portion 2a in order to prevent the bottom portion 1c from being displaced in the direction of the concave portion 2a by the cutter 6.

Next, FIG. 2E shows a second pressing step. In order to further deepen the primary recess 2a formed in the first pressing step, the first pressing step is performed by pressing the die 4. A secondary pressing process is performed to form the concave portion 2 having a completed depth. As a result, a protrusion 3 having a height substantially equal to the depth of the recess 2 is formed on the other surface 1b side of the metal plate 1 in the same manner as in the first order. The outer dimensions of the projections 3 are also similar to the inner dimensions of the depressions 2 and are slightly smaller.

Thereafter, the second cutting shown in FIG. 2F is performed. That is, similarly to the first cutting process, the convex portion 3 formed on the other surface 1b side of the metal plate 1 by the second pressing process is cut from the base end by the cutter 6 so as to be flush with the other surface 1b. To cut. Cutter 6 used at this time
Are the same as those used in the first cutting step. Then, the cutter 6 is moved in the direction of the arrow shown in FIG.
2 (G), the projection 3 is cut, and the other surface 1b side of the metal plate 1 is formed flat.

According to the above steps, one surface 1a of the metal plate 1
On the side, a concave portion 2 shown in FIG. 1 is formed. Further, recess 2
Is formed with a relatively thin bottom 1c having a predetermined thickness. That is, in the step shown in FIG. 2, the first pressing step to the first cutting step, and then the second pressing step to the second cutting step are repeated a plurality of times to sequentially increase the depth of the recess 2 and In each cutting step, the projection 3 is gradually cut in a thin state. This method is suitable for preventing residual stress and stress from being applied to the metal plate 1. Further, when the thickness of the bottom 1c located on the bottom surface of the concave portion 2 is made smaller than the thickness of the metal plate 1, the pulling force of the bottom 1c by cutting is small.
There is no risk of damage. Further, since the pressing force in each pressing step can be reduced, there is a feature that processing can be performed even with a small press machine.

In the method illustrated in FIG. 2, one recess 2 is formed in one metal plate 1, but one recess 2 is formed in one metal plate. A plurality of recesses of about 2 to 5 may be formed simultaneously. Further, the concave portion may be a circle or a polygon other than a square.

Further, in forming the concave portion, the convex portion 3
5 is formed in a substantially trapezoidal shape by providing a tapered portion 3b between the base end and the distal end of the metal plate 1 as shown in FIG. May be. Further, in addition to the tapered shape, it may be formed in a rounded R shape.

FIG. 6 shows a modification of the forming method shown in FIG. That is, the concave portion 2 is pressed and formed in one pressing step, and then a first cutting step of cutting to a line thickness indicated by A is performed first, and then a first cutting step of cutting to a line thickness indicated by B is performed. The cutting process is repeated a plurality of times, for example, a third cutting process for cutting to a line thickness indicated by C is performed, and the convex portion 3 having a predetermined thickness is gradually cut. Is what you do. According to this forming method, since the concave portion 2 is formed by pressing in one pressing step, the process is simplified and the efficiency is improved. As for the thickness cut at one time, the feature that the residual stress or the stress is prevented from being applied to the metal plate 1 is utilized as it is, as in the example of FIG.

In the above-described embodiment, if the metal plate 1 is thin or a relatively shallow recess is sufficient, each step may be performed once. Furthermore, as shown in FIG. 7, the concave portion 2 may be formed in a multi-stage type that gradually becomes deeper toward the center, or the concave portion 2 may be formed in a substantially mortar shape. Any shape can be set.

[Other Embodiments] FIGS. 3A to 3D show another example of a method for forming a concave portion in a metal plate according to the present invention. In the example shown in FIG. 3, a concave portion 2 of a predetermined shape is formed by pressing one side 1 a of the metal plate 1, and a plurality of columnar convex portions are formed to protrude on the other surface 1 b side. 2 shows a method of cutting by the following method.

The material of the metal plate 1 shown in FIG.
In the same manner as in the example, copper or aluminum is selected. FIG. 3B shows a pressing step, in which the concave portion 2 is pressed against the metal plate 1 placed on the die 8 of a press machine (not shown) in a state of being positioned from one surface 1a side by a punch 5 mounted on the press machine shown. Form. In the die 8, a plurality of grooves 8 a are engraved at positions corresponding to the lower part of the concave portion 2, and when the concave portion 2 is formed by the punch 5, a metal approximately equal in volume to the concave portion 2 is transferred to the plural groove 8 a. Then, as shown in FIG. 4 (A), a large number of jetties 9 (corresponding to convex portions) on the other surface 1b side of the metal plate 1.
Protrudes.

In the formation method illustrated in FIG.
In addition to the jetty 9, a plurality of columnar projections 10 as shown in FIG. 4 (B) or irregularly-shaped projections as shown in FIG. 4 (C) so as to be easily cut in a later cutting step. The unit 11 can also be used. Further, in addition to a columnar shape, it may be a prismatic shape, and an appropriate shape can be selected according to conditions of a material, a cutter, and the like.

FIG. 3C shows a cutting step, in which a large number of jetties 9 formed on the other surface 1b side of the metal plate 1 are cut from the base end by the cutter 6 so as to be flush with the other surface 1b. It is cut in such a state. At this time, cutter 6
Is parallel to the longitudinal direction of the jetty 9 as shown in FIG.
In addition, while moving in the direction of the arrow shown in FIG. 3 (C) in a state where the center line of the jetty 9 is made to coincide with the center line of the jetty 9, it is cut as shown in FIG. Other side 1b
Are formed flat. In this cutting process, the bottom 1
In order to prevent the displacement of c, the inside of the concave portion 2 is pressed by the pressing tool 7.

Through the above steps, one surface 1a of the metal plate 1
On the side, a recess 2 shown in FIG.
Is formed with a bottom 1c having a predetermined thickness. FIG.
In the process shown in (1), a large number of ridges 9 are formed by a pressing process, and the ridges 9 are cut by a cutting process.
There is a feature that the jetty 9 can be cut with a small force.
For this reason, residual stress and stress on the metal plate 1 can be reduced. Further, since the force for pressing the jetty 7 may be small, processing can be performed even with a small press machine.

In the above-described embodiment, a cutter having a tooth portion is used as a cutting process. However, cutting may be performed by milling or a grinder, and the present invention is not limited to these and may deviate from the present invention. It can be deformed as long as it does not.

[0030]

As described above, according to the method of forming a concave portion in a metal plate according to the present invention, a concave portion having a predetermined shape is formed by pressing a metal plate from one surface side by a press or the like.
A convex portion is formed so as to protrude on the other surface side of the metal plate, and the convex portion is cut by cutting to form a concave portion only on one side of the metal plate. The concave portion can be formed, and the metal of the concave portion is transferred from the convex portion to the other surface side. Therefore, the concave portion can be formed without giving a large stress to the metal plate or changing the composition. Also, by transferring the metal of the concave portion to the convex portion on the other surface side, the concave portion can be easily formed even with a press machine having a small pressing force, and the life of a punch or the like for forming the concave portion can be extended. In addition to that, the cutting tool for cutting the convex portion can also have a long life, so that the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a product using a method for forming a concave portion in a metal plate according to the present invention.

FIGS. 2A to 2G are process explanatory views showing a concave portion forming process of the present invention.

FIGS. 3A to 3D are process explanatory views showing another concave portion forming process of the present invention.

FIGS. 4A to 4C are plan views showing modified examples of a convex portion.

FIG. 5 is a cross-sectional view showing a modification of the method for forming a concave portion in a metal plate according to the present invention.

FIG. 6 is a sectional view showing another example of the concave portion of the metal plate according to the present invention.

FIG. 7 is a cross-sectional view showing a modified example of a projection formed on a metal plate.

FIG. 8 is a cross-sectional view showing a conventional method for forming a concave portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal plate 1a One surface 1b The other surface 2 Concave part 3 Convex part 5 Punch 6 Cutter

Claims (5)

[Claims] 1. A metal plate having a predetermined thickness is formed by pressing a concave portion having a predetermined shape smaller than the thickness of the metal plate from one surface side by a press or the like, and a convex portion is formed to project from the other surface side of the metal plate. Transferring the metal in the concave portion, cutting the convex portion on the other surface side by cutting, and forming a concave portion on one surface side of the metal plate. 2. A recess having a predetermined shape, which is shallower than the thickness of the metal plate, is formed from one surface of the metal plate by pressing, and a similar protrusion slightly smaller than the recess is formed on the other surface of the metal plate. 2. The method according to claim 1, wherein the portion is cut by cutting. 3. A step of pressing a concave portion from one side of a metal plate and a step of cutting a convex portion on the other side by cutting a plurality of times to form a concave portion of a predetermined shape gradually. The method according to claim 1, wherein the concave portion is formed in the metal plate. 4. A step of pressing a concave portion from one surface side of a metal plate, and cutting the convex portion on the other surface side by dividing the convex portion a plurality of times and gradually cutting the convex portion. Item 1
3. The method for forming a concave portion in a metal plate according to item 1. 5. The method according to claim 1, wherein a plurality of columnar projections each having a prism, a cylinder, a ridge, or an irregular shape are formed on the other surface of the metal plate, and the columnar projections are cut by cutting. Item 4. The method for forming a concave portion in a metal plate according to Item 1.