JP2006346815A - Press die for aluminum shape material cutting and aluminum shape material cutting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press die for aluminum shape material cutting capable of easily cutting a complicated cross-section shape aluminum shape material and producing a complicated cross-section shape aluminum part uniformly, in high quality and in large quantity. <P>SOLUTION: This press die for aluminum shape material cutting is molded by extrusion, a press die type upper die 2 and a press die type lower die 3 to cut the lengthy aluminum shape material on which a large number of fin parts erected inclined have shape material insertion holes of a roughly similar shape as a cross-section shape of the aluminum shape material and in size free to insert the aluminum shape material and blade parts are provided on peripheral edge parts of these shape material insertion holes. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an aluminum mold material cutting press mold and an aluminum mold material cutting method, and in particular, an aluminum mold material having a mold material insertion hole having a size similar to the cross-sectional shape of an aluminum mold material such as a heat sink to be cut and having a size capable of inserting an aluminum mold material. The present invention relates to a cutting press die and an aluminum die cutting method.

  Aluminum heat sinks are often used for cooling semiconductor devices, but one of the reasons for their use is that they have excellent heat transfer characteristics and can have a complex shape with many long fins. There is an advantage that high-density heat dissipation can be realized.

  This aluminum heat sink is manufactured by extrusion molding, and this extrusion molding is suitable for mass production, and furthermore, a stable shape and high quality can be obtained. In addition, in order to obtain the above high heat dissipation characteristics, it is important that the extruded shape is stable, is in close contact with the semiconductor device, and heat transfer is performed efficiently.

  Accordingly, the close contact between the two is realized by bringing the flat portion of the semiconductor device into close contact with the flat portion of the heat sink and screwing it.

  In order to improve the shape accuracy of the flat part of the heat sink, it is usually extruded to form a long aluminum mold, cooled to near room temperature, and cut to the required length with a saw or the like. A saw is used in a processing method such as press cutting, so that the heat radiation fin part with a complicated shape is deformed, and further, it is deformed to the joint part with the semiconductor device such as the flat part of the main body. This is because the heat dissipation characteristics are deteriorated.

  Originally, if press cutting is possible, its productivity will be greatly improved compared to saw cutting, but in conventional press cutting, the cutting blade shape does not match the complicated shape of the aluminum extrusion die for heat sink, Since cutting at all cutting points is not performed at the same time and there is a time shift, there has been a fundamental problem that local stress applied to the aluminum mold due to cutting deforms the cut portion.

Patent Document 1 proposes a method of cutting a long heat sink mold material using a press, and Patent Document 2 proposes a method of manufacturing a heat sink using a press.
JP-A-8-55943 JP 2001-284505 A

  The present invention has been made in consideration of the above-described circumstances, and can easily cut an aluminum mold having a complicated cross-sectional shape by press working, and can uniformly, high-quality and mass-produce aluminum parts having a complicated cross-sectional shape. An object is to provide a press die for cutting.

  In addition, according to the aluminum die cutting method according to the present invention, an aluminum die cutting having a complicated cross-sectional shape can be easily cut by pressing, and an aluminum component having a complicated cross-sectional shape can be produced uniformly, with high quality and in large quantities. It aims to provide a method.

  In order to achieve the above-described object, the aluminum die cutting die according to the present invention is formed by extrusion, and is used to cut a long aluminum die provided with a large number of fin portions that are inclined and erected. This is a press mold for cutting aluminum mold material, and the upper mold and lower mold of the press mold have a mold material insertion hole that is substantially similar to the cross-sectional shape of the aluminum mold material and can be inserted into the aluminum mold material. A blade is provided at the peripheral edge of the hole.

  In addition, the aluminum mold material cutting method according to the present invention includes a long aluminum mold material formed by extrusion and provided with a large number of inclined fin portions, and an aluminum having a shape substantially similar to the cross-sectional shape of the aluminum mold material. An upper mold and a lower mold having a mold material insertion hole of a size that can be inserted into the mold material and a blade portion provided at the peripheral edge of the mold material insertion hole are prepared, and an aluminum mold material is inserted into the upper mold and the lower mold. It is inserted into the hole, and the upper die is slid in a state inclined with respect to the lower die.

  According to the press die for cutting an aluminum mold material according to the present invention, an aluminum mold material cutting that can easily cut an aluminum mold material having a complicated cross-sectional shape by press processing and can produce aluminum parts having a complicated cross-sectional shape uniformly, high quality and in large quantities. A press die can be provided.

  In addition, according to the aluminum die cutting method according to the present invention, an aluminum die cutting having a complicated cross-sectional shape can be easily cut by pressing, and an aluminum component having a complicated cross-sectional shape can be produced uniformly, with high quality and in large quantities. A method can be provided.

  Hereinafter, an aluminum die cutting press die according to an embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a side view showing a use state of a heat sink cut by an aluminum mold material cutting press die according to the present invention, and FIG. 2 is a side view of an upper die of an aluminum mold material cutting press die according to an embodiment of the present invention. FIG. 3 is a side view of the lower mold.

  First, an aluminum component, for example, an aluminum heat sink (hereinafter simply referred to as a heat sink) 1 manufactured by cutting an aluminum mold material with an aluminum mold material cutting press die according to the present invention will be described.

  As shown in FIG. 1, the heat sink 1 is made of aluminum and has a flat portion 1a to which a semiconductor device D is screwed by a screw S. Six heat dissipating fin portions 1b are provided at the lower portion, and both sides are fixed for installation. The rib 1c is used to be assembled and fixed in the device. The heat sink 1 has a width of 100 mm, a length of 100 mm, a length of the longest radiating fin portion of 40 mm, a main body portion thickness of 2.5 mm, a radiating fin portion root portion thickness of 2 mm, and a tip portion thickness of 1 mm. As shown in an enlarged view in part A of FIG. 1, projections 1d that are continuous in the push-out direction with a pitch of 3 mm and a height of 0.5 mm are formed on all of the six radiating fin portions 1b. The formation of this protrusion improves the heat dissipation effect.

  Next, an aluminum die cutting press die according to an embodiment of the present invention will be described.

  The aluminum die cutting press die according to this embodiment is used to cut a long heat sink aluminum die having the same cross-sectional shape as the heat sink 1 in order to produce the heat sink 1 shown in FIG. 2 and the lower mold 3 shown in FIG.

  The upper mold 2 is made of carbon steel for mold having a thickness of 20 mm, and is provided with an upper mold insertion hole 2a having a shape similar to the cross-sectional shape of the heat sink 1 and capable of inserting an aluminum mold material. The upper die blade portion 2b is provided at a part of the peripheral edge portion. The upper die blade portion 2b is indicated by a thick line in FIG. 2, and is provided on the upper right edge of the upper die insertion hole 2a and the upper die insertion hole 2a which becomes a blade portion when the upper die 2 is obliquely lowered. .

  The size of the upper mold insertion hole 2a is not limited as long as an aluminum mold material can be inserted, but it is preferable that the gap between the upper mold insertion hole and the aluminum mold material is 0.1 to 1.8 mm. This facilitates the holding of the aluminum mold material by the press die during cutting and the sliding movement within the mold material insertion hole. When the gap is smaller than 0.1 mm, the slide movement is not smooth, and when it exceeds 1.8 mm, the aluminum mold material is not sufficiently held by the press die.

  As shown in FIG. 3, on the other hand, the lower mold insertion hole 3a of the lower mold 3 has the same shape as the upper mold insertion hole 2a, and the lower mold blade 3b is formed on a part of the peripheral edge of the lower mold insertion hole 3a. Is provided. The lower die blade portion 3b is shown at a thick line in FIG. 3, and is provided at a position other than the portion corresponding to the portion of the lower die insertion hole 3a where the upper die blade portion 2b shown at a thick line in FIG. 2 is provided.

  Since the upper mold and the lower mold have the same shape except for the blade portion, both molds can be manufactured in the form of a combination of both, and can be processed in the work process required to manufacture one mold. It is easy, and if the mold is manufactured by electrodischarge machining using the heat sink as a master model, the mold can be easily manufactured.

As shown in FIG. 4, during the press working, the lowering direction of the upper mold 2 is preferably inclined by 45 ° with respect to the flat portion 1a of the heat sink 1. In this state, the aluminum having the smallest angle with the lowering direction of the upper mold The flat plate part surface of the fin part 1b of the mold material is the upper mold side of the fin part 1b of the B part, and the angle θ at this time is 25 °. In order to set the minimum angle θ, it is a matter of course that the design of the aluminum mold material and the upper mold lowering direction corresponding to the shape are comprehensively studied. This smaller angle is not flat portion of the heat radiating fin portion or body having, but only a partial inclined section C ₁ and the small R portion D ₂ is less than 5 °, the distance of the upper mold lowering direction of this part The design is as small as 2 mm and does not cause a problem in cutting. It is not provided the blade section to the inclined portion D ₁ and the small R portion D _2.

  Moreover, the aluminum die cutting method according to the present invention will be described.

  As shown in FIG. 5, the upper mold 2 and the lower mold 3 are set in a press while being in close contact with each other in the horizontal direction, and a long heat sink aluminum mold 1 'having the same cross-sectional shape as the heat sink 1 is inserted into the lower mold insertion hole 3a. Is inserted through the lower mold insertion hole 3a and the upper mold insertion hole 2a, and is penetrated by the length L of the heat sink 1 from the cut surface (the close surface of the upper mold 2 and the lower mold 3). Thereafter, while sliding the upper mold 2 in close contact with the lower mold 3, as shown in FIG. 4, the upper mold 2 is lowered with an inclination of 45 ° with respect to the flat portion 1 a, for example, as shown in FIG. The mold 2 is cut between the lower mold 3 and the aluminum mold 1 'to manufacture the heat sink 1.

  When the upper mold and the lower mold are set up and down, the upper mold is slid with respect to the lower mold, for example, in a state inclined with respect to the lower mold in a horizontal plane. Further, if the through hole for the mounting screw and the inner surface threading process are performed in the same pressing process, all the processes are completed by a single pressing process.

  In the cutting process of the aluminum mold material, the aluminum mold material 1 ′ is inserted and cut into the lower mold insertion hole 3a and the upper mold insertion hole 2a which are held with high communication accuracy. 3b has a similar shape and the gap between the aluminum mold 1 'and the insertion holes 3a, 3b is controlled to be 0.1 to 1.8 mm, so the aluminum mold 1' is inserted very smoothly and cut. It is fixed to the lower mold 3 side with high accuracy. In addition, since the angle formed by the lowering direction of the upper mold 2 and the flat part of the aluminum mold material 1 ′ is set to an angle of 10 ° or more, for example, 25 °, all the parts of the aluminum mold material 1 ′ are lowered by the lowering of the upper mold 2. , Cutting is started almost simultaneously (the upper and lower blades start to bite into the aluminum mold). Therefore, the aluminum mold has no deformation in the radiating fin part and the flat part, the heat transfer characteristic of the fin part is improved, the heat transfer characteristic is improved by improving the adhesion with the semiconductor device, and the cut part is cut with high accuracy. Roughness and deformation are suppressed. Moreover, even if protrusions are formed on the radiating fin portion, according to the cutting method of the present invention, the aluminum mold can be cut without deforming the radiating fin portion.

  Furthermore, since both types of cutting portions are provided in both insertion holes, there is no danger of inserting and cutting an operator's finger or the like, which is extremely safe.

  Further, there is no generation of aluminum chips as in the case of cutting with a saw, and this chip disposal work becomes unnecessary, and further, material costs are reduced.

  As described above, according to the aluminum mold material cutting press mold and the aluminum mold material cutting method of the present embodiment, an aluminum mold material having a complicated cross-sectional shape can be easily cut by pressing, and a heat sink having a complex cross-sectional shape can be uniformly and deformed. The heat transfer characteristics are improved and high quality and mass production are possible.

  In the present embodiment, the manufacture of the heat sink has been described as an example. However, the present invention is not limited to this, and the heat sink can be used for manufacturing an aluminum part having a complicated cross-sectional shape.

The side view which shows the use condition of the heat sink cut | disconnected by the press die for aluminum mold material cutting which concerns on this invention. 1 is a side view of an upper mold for cutting an aluminum mold material according to an embodiment of the present invention. The side view of the lower mold | die for aluminum mold material cutting which concerns on one Embodiment of this invention. The conceptual diagram of the aluminum-type material cutting method which concerns on one Embodiment of this invention. The conceptual diagram of the aluminum-type material cutting method which concerns on one Embodiment of this invention.

Explanation of symbols

1 Heat sink 2 Upper mold 2a Upper mold insertion hole 2b Upper mold blade part 3 Lower mold 3a Lower mold insertion hole 3b Lower mold blade part

Claims (9)

An aluminum mold material cutting press mold used for cutting a long aluminum mold material formed by extrusion and provided with a large number of inclined fin portions, and an upper mold and a lower mold of the press mold. Has a mold material insertion hole that is almost similar to the cross-sectional shape of the aluminum mold material and is large enough to insert an aluminum mold material, and has a cutting edge at the periphery of the mold material insertion hole. Press mold. 2. The aluminum mold material cutting press die according to claim 1, wherein the blade portion is provided at a part of the peripheral portion. The press die for cutting an aluminum mold material according to claim 1 or 2, wherein a gap between the mold material insertion hole and the aluminum mold material is 0.1 to 1.8 mm. 4. The press die for cutting an aluminum die according to claim 1, wherein the upper die and the lower die are inserted in the same shape. 5. The aluminum mold material cutting press die according to any one of claims 1 to 4, wherein the long aluminum mold material is an aluminum mold material for a heat sink. A long aluminum mold that is formed by extrusion and is provided with a large number of fins that are inclined and upright, and a mold insertion hole that is similar in shape to the cross-sectional shape of the aluminum mold and that can be inserted into the aluminum mold. An upper mold and a lower mold having a blade portion at the periphery of the mold material insertion hole are prepared, and an aluminum mold material is inserted into the mold material insertion holes of the upper mold and the lower mold. An aluminum mold material cutting method characterized by sliding in an inclined state. 7. The method of cutting an aluminum mold material according to claim 6, wherein the upper mold is slid in a direction that does not coincide with the extending direction of all the fin portions of the aluminum mold material. The aluminum mold material cutting method according to claim 7, wherein the sliding direction of the upper die has a relative angle of 10 ° or more with respect to the flat plate portion surface of the fin portion. 9. The aluminum mold material cutting method according to claim 6, wherein the elongated aluminum mold material is an aluminum mold material for a heat sink.

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