JP2011218413A - Extrusion die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extrusion die capable of easily extruding an aluminum shape material composed of a base part and a plurality of fin sections in a stable posture, and extruding its service life.SOLUTION: The extrusion die 10 extrudes, for shaping, an aluminum shape 1 formed with a base part 2, and a plurality of fin sections 3 formed integrally, continuously in sequence with this base part 2, and includes: a billet guide recess 11 provided on an upstream side edge surface in the extruding direction of a billet 40; a base part forming through-hole 12 for forming the base part 2, which comes in communication with the billet guide recess 11; and fin section forming grooves 13 that come in communication with the billet guide recess 11 and form a plurality of fin sections 3. The fin section forming grooves 13 are made to be of such a shape in which the fin section forming grooves 13 respectively evenly expand from the groove entrance holes 13A on the upstream side in the extruding direction of the billet 40 toward the groove exits 13B at the downstream side.

Description

  The present invention relates to an extrusion die, and more specifically, a base portion that is rectangular in cross section and continuous in one direction, and a plurality of fin portions that are formed in parallel in one direction on one surface of the base portion. It is related with the extrusion die for manufacturing the aluminum profile with a fin which consists of.

  2. Description of the Related Art Conventionally, in electronic devices such as personal computers and audio devices, heat at a considerable temperature is generated during use, and the performance of the electronic devices is adversely affected.

  For example, extrusion heat sinks, cutting heat sinks, cold plates, etc. are known as heat countermeasure products for the above electronic devices. From the viewpoint of production efficiency, etc., aluminum is made soft in a clay-like manner using extrusion dies. An extruded heat sink formed by extruding a billet is often used as a heat dissipation member.

As the extrusion heat sink, an aluminum shape with fins is mainly used. That is, the aluminum profile with fins is a thick base portion having a rectangular cross section and continuous in one direction, and a plurality of thin plates formed in parallel in one direction on one surface of the base portion. And a fin-like portion.
In the aluminum shape member with fins, in order to improve the heat dissipation, it is required that the tong ratio (fin height / fin interval) is particularly large in the fin portion.
And the electronic device which is the said various heat generating bodies is mounted | worn with the other surface side of the said base part.

  As described above, the finned aluminum profile is often manufactured by an extrusion molding method in which a billet made of aluminum, which is an extrusion material, is made to be substantially clay-like soft and extruded by an extrusion die. .

  In general, in extrusion molding with a complicated shape such as a finned aluminum profile, the flow resistance of the extruded material, that is, the billet, depends on the width of the extrusion forming base hole and fin forming groove and the distance from the surface of the extrusion die. There is a problem that unevenness occurs, and molding failure such as distortion or bending occurs in the extruded aluminum profile due to the flow rate difference of the billet.

Therefore, as one method for dealing with such molding defects, a manufacturing die in which billet flow is adjusted is known (for example, see Patent Document 1).
In the manufacturing die disclosed in Patent Document 1, an adjustment recess is provided in a billet flow space to adjust billet flow.

  Further, in a normal aluminum die extrusion die including the manufacturing die disclosed in Patent Document 1, the passage for forming the fin portion is formed in a two-stage passage as shown in FIG. ing.

That is, the fin forming passage 113 of the die 100 is formed by a fin guide passage 113C formed on the upstream side in the extrusion direction and a relief passage 113D formed subsequently on the downstream side in the extrusion direction. Among these, the fin part 3 represented by a virtual line is formed when the billet 40 passes through the fin guide passage 113A. And the fin-shaped aluminum shape 1 is formed with this fin part 3 and the base part 2 represented by a virtual line.
The fin guide passage 113C has a width dimension corresponding to the width dimension of the fin portion 3 and is formed from the passage inlet 113A to a position extending a predetermined dimension toward the passage outlet 113B, and is formed wider than the fin guide passage 113C from the end thereof. The escape passage 113D is provided.

JP 2001-38416 A

However, the configuration shown in FIG. 8 has the following problems, and it is difficult to form a fin portion having a stable posture.
That is, even when the billet passes through the fin guide passage 113C, the fin portion 3 may approach one of the side wall surfaces of the opposing escape passage 113D due to uneven resistance or the like, and may be extruded in that state. is there. In the conventional configuration, since the escape passage 113D is formed, it is difficult to secure the rigidity of the side wall portion that forms the escape passage 113D. As a result, the side wall surface is pushed by the fin portion 3 and has the side wall surface. There is a possibility that the side wall portion may fall to the adjacent fin guide passage 113C side.
In particular, when the interval P between the fin guide passages 113C is small, that is, in the type in which a large number of fin portions 3 are provided, the thickness of the side wall portion that forms the fin guide passage 113C is also reduced. Therefore, the rigidity of the side wall portion is insufficient, and the side wall portion may be damaged by being pushed by the billet 40 in one fin guide passage 113C, for example.

  In addition, when the billet 40 113 is pushed by the billet 40 and falls down even if the side wall portion is not damaged, the escape passage 113D of the adjacent fin guide passage 113C is deformed and affects the fin guide passage 113C. As a result, there is a problem that the shape of the fin portion 3 cannot be formed in a stable state.

Further, in the fin forming passage 113, when the billet for forming aluminum is extruded, first, it passes through the fin guide passage 113C formed on the upstream side in the extrusion direction.
For this reason, the flow of the billet is delayed due to the resistance of the wall surface of the passage 113C. On the other hand, the base portion is thick, and since the resistance in the passage for forming the base portion is small, the billet flows faster than the flow in the fin guide passage 113C. As a result, uneven resistance and flow differences occur between the fin guide passage 113C and the base portion formation passage, and there is a problem in that molding failure such as distortion or bending occurs in the extruded aluminum profile due to the flow rate difference of the billet. is there.

  Therefore, the object of the present invention has been proposed to solve the above-described problems, and in particular, a plurality of fin portions of an aluminum shape member composed of a base portion and a plurality of fin portions can be easily and stably maintained. An object of the present invention is to provide an extrusion die which can be extruded and can have a long life.

  The extrusion die according to the present invention includes a base portion that is rectangular in cross section and continuous in one direction, and a plurality of fin portions that are integrally formed in one direction and integrally with the base portion on one surface of the base portion. An extrusion die for extruding the aluminum shape member, and a billet guide recess provided on the upstream end face in the extrusion direction of the billet for the aluminum shape member for guiding the movement of the billet, and the billet guide A base portion forming through hole for continuously forming the base portion and the base portion forming through hole, and communicating with the billet guide concave portion and continuously downstream in the extrusion direction. A plurality of fin-portion forming grooves, each of which has an opening end portion communicating with the through hole for forming the base portion and forming the plurality of fin portions. The fin unit molding groove and from the groove inlet of the extrusion direction upstream side of each of the billet, characterized in that a uniformly expanded shape toward the groove outlet of the downstream side.

Since the extrusion die of the present invention is configured as described above, when the billet is extruded to produce an aluminum profile, the billet moves along the fin forming groove. At this time, the fin portion forming groove is uniformly expanded from the upstream groove entrance to the downstream groove exit, and the billet is extruded in the shape of the groove entrance. It does not touch anywhere on the side wall surface that forms the groove. Therefore, resistance due to the fin portion forming groove is eliminated and the flow of the billet is made uniform. As a result, the plurality of fin portions are not pushed out in a biased manner and can always be easily extruded in a stable posture.
In addition, since the billet contacts only the groove entrance of the fin part forming groove, the side wall part forming the fin part forming groove does not fall down or break due to the uneven movement of the fin part, and as a result, the strength of the die Can be ensured and the service life can be extended.
In addition, the fin forming groove has a shape that expands uniformly from the upstream groove inlet to the downstream groove outlet in the billet extrusion direction. This can eliminate the collapse of the fin portion due to the improvement in rigidity.

It is a perspective view which shows one Embodiment of the extrusion die of this invention. It is a longitudinal cross-sectional view which shows the aluminum shape manufacturing apparatus with which the said extrusion die was integrated. It is the longitudinal cross-sectional view which showed the detail of the fin part formation groove | channel in the extrusion die of the said embodiment, and followed the III-III line in FIG. It is the longitudinal cross-sectional view along the IV-IV line | wire in FIG. 1 and FIG. 3 which shows the relationship between the chamber part and base part shaping | molding hole in the extrusion die of the said embodiment. It is a perspective view which shows the aluminum profile with a fin manufactured by the extrusion die of the said embodiment. It is a longitudinal cross-sectional view which shows the modification of this invention. It is a perspective view which shows the other modification of this invention. It is a longitudinal cross-sectional view which shows the relationship between the chamber part of a conventional extrusion die, a base part shaping | molding hole, and a fin part shaping | molding groove | channel.

Hereinafter, an embodiment of the extrusion die of the present invention will be described with reference to FIGS.
FIG. 1 shows an extrusion die 10 according to the above-described embodiment, and the extrusion die 10 is incorporated in a profile manufacturing apparatus 20 as shown in FIG.
The extrusion die 10 and the shape material manufacturing apparatus 20 extrude the finned aluminum shape material 1 used as a heat sink for electronic devices such as personal computers and audio devices.

First, the finned aluminum profile 1 will be described with reference to FIG.
The finned aluminum profile 1 has a base portion 2 that is thick and has a rectangular cross section and is continuous in one direction, and is continuous with the base portion 2 in one direction on one surface of the base portion 2. And a plurality of thin plate-like fin portions 3 formed in this manner.
An electronic component 50 that generates heat, such as a transistor, is attached to the other surface of the base portion 2.

Moreover, as a raw material of the aluminum shape member 1 with fins, it is preferable to use, for example, an Al—Mg—Si alloy such as A6063 in view of extrudability and mechanical strength.
In addition, as a raw material of the aluminum shape member 1 with a fin, you may use pure aluminum or another aluminum alloy of the said alloy.

Next, the outline of the profile manufacturing apparatus 20 will be described with reference to FIG.
The profile manufacturing apparatus 20 includes a container 21 disposed on the upstream side in the extrusion direction of the billet 40 for the finned aluminum profile 1 so that the billet 40 is accommodated in the container 21. It has become.
The billet 40 is pushed out from the upstream side toward the downstream side as indicated by an arrow A by a stem or the like (not shown).
Here, the billet 40 is a material obtained by softening an aluminum material into a substantially clay shape by heating.

On the downstream side of the flow of the container 21, a female die 22 having a billet passage 22 </ b> A and the extrusion die 10 of the present invention are sequentially arranged while being held by a holder 23. A bolster 24 is disposed on the downstream side.
Inside the female die 22, a baffle portion 22 </ b> B is provided in a direction against the flow of the billet 40. The baffle portion 22B is formed at a substantially central portion in the width direction of the female die 22 with a protruding portion protruding from one side to the other side. Therefore, at the apex portion of the protruding portion, the billet passage 22A is formed. Is narrower.

The extrusion die 10 is configured as shown in FIG.
That is, a chamber 11 that is a billet guide recess is formed on the end face of the extrusion die 10 on the upstream side in the billet extrusion direction.
As shown in detail in FIG. 3, the chamber 11 is formed by being dug into a predetermined depth in a substantially rectangular shape from the end face of the extrusion die 10, and the bottom face (the back end face of the flow of the billet 40) 11A A base part forming hole 12 and a plurality of fin part forming grooves 13 penetrating toward the rear end face of the extrusion die 10 are formed.

  In the chamber 11, the dimension from the both sides in the width direction of the base portion forming hole 12, both outermost sides of the fin portion forming groove 13 and the outside of the other end of the fin portion forming groove 13 to the side wall surface 11 </ b> B of the chamber 11 is 3 Both sides are set to approximately the same size.

On the other hand, among the side wall surfaces 11B of the chamber 11, one side wall surface 11C connected to the base part forming hole 12 is set to a size smaller than the above three dimensions. That is, a step having a dimension S <b> 2 is formed between the one side wall surface 11 </ b> C and the lower end of the base portion forming hole 12. And this level | step difference S2 is set so that it may become 1/5 or less with respect to the height dimension S1 of the base part shaping | molding hole 12. FIG.
Thereby, the frictional force is increased between the billet 40 to be extruded and the one side wall surface 11 </ b> C, and thus the flow speed of the billet 40 is adjusted to be slow before reaching the base part forming hole 12. Can do.
The step S2 may be zero.

In FIG. 4, the shape of the parallel fin portion forming grooves 13 in a cross section parallel to the base portion 2 is shown.
Each fin portion forming groove 13 has an expanding shape that extends from the groove inlet 13A toward the groove outlet 13B and symmetrically with respect to the center line C of the fin portion forming groove 13, and the inclination angle α ° thereof is The fin part forming groove 13 is inclined at a predetermined angle in the direction of escaping from the center line C of the fin part forming groove 13 with respect to the orthogonal line M orthogonal to the hook part from the groove part 13A of the groove entrance 13A.
Therefore, the fin part forming groove 13 has a dimension W2 of the groove outlet 13B larger than the dimension W1 of the groove inlet 13A.
The inclination angle α ° can be appropriately changed to an optimum angle corresponding to the width dimension of the fin portion 3.

Since each fin part forming groove 13 has a uniform and linearly expanding shape from the groove inlet 13A to the groove outlet 13B, the extruded billet 40 is opposed to the fin part forming groove 13. Extruded along the shape of the groove entrance 13A without touching anywhere on the side.
Therefore, each fin part 3 is formed without bending, and at the same time, the end 10A of the groove forming wall part is not affected by the bending of the fin part 3 on the end part 10A of the groove forming wall part. It will not be damaged. Therefore, the life of the extrusion die 10 can be extended.
Further, the fin portion forming groove 13 has a shape that uniformly expands from the groove inlet 13A on the upstream side in the extrusion direction of the billet 40 toward the groove outlet 13B on the downstream side. Therefore, it is possible to eliminate the shortage of rigidity caused by providing a stepped relief passage, and to suppress the falling of the fin portion 3 due to the improvement in rigidity.

  As shown in FIG. 3, the bottom portion 13 </ b> C of each fin portion forming groove 13 has a base portion forming hole with respect to a line parallel to a straight portion continuous from the upstream side to the downstream side in the extrusion direction in the base portion forming hole 12. 12 is formed at a predetermined inclination angle α ° in the direction of escaping from 12.

  Next, the action of extruding the finned aluminum profile 1 by the profile manufacturing apparatus 20 equipped with the extrusion die 10 will be described.

  First, the homogenized billet 40 made of, for example, A6063 is introduced into the container 21 and is extruded at, for example, an extrusion temperature of 486 ° C. and an extrusion speed of 16 m / mm while being pressed by a stem or the like.

  Then, the billet 40 flows into the chamber 11 formed on the end face of the extrusion die 10 through the billet passage 22 </ b> A of the female die 22. At this time, the flow of the billet 40 is partially changed by the baffle portion 22B, and a part of the billet 40 goes straight to the narrowed portion of the billet passage 22A while moving straight, and then the chamber along the shape of the baffle portion 22B. After flowing into the side 11 and being guided into the chamber 11, it flows into the base part forming hole 12 and the fin part forming groove 13.

  Among the billets 40 guided into the chamber 11, the billet 40 that flows on the one side wall surface 11 </ b> C of the chamber 11 is molded into the base portion in a state where the flow speed is reduced by the frictional force generated between the billet 40 and the one side wall surface 11 </ b> C. It flows into the hole 12.

Moreover, in the fin part shaping | molding groove | channel 13, the billet 40 extruded from 13A of groove | channel inlets is extruded to the groove outlet 13B side, without contacting the site | part expanded.
Therefore, the billet 40 is introduced into the base portion forming hole 12 and the fin portion forming groove 13 in a state where the flow rate balance of the billet 40 is substantially uniform. As a result, the flow resistance of the base part forming hole 12 and the fin part forming groove 13 is made uniform, the dimensions of the base part 2 and the fin part 3 are accurately reflected and extruded, and the overall accuracy is high. The profile 1 is formed.

Since the extrusion die 10 of the present embodiment is configured as described above, the following effects can be obtained.
(1) When the billet 40 is guided to the chamber 11 of the extrusion die 10 and pushed, the billet 40 moves along the base portion forming groove 12 and the fin portion forming groove 13. At this time, the fin forming groove 13 is uniformly expanded from the groove inlet 13A on the upstream side in the extrusion direction of the billet 40 toward the groove outlet 13B on the downstream side, and the billet 40 is extruded in the shape of the groove inlet 13A. Therefore, it does not contact anywhere on the side wall surface that forms the fin portion forming groove 13. Therefore, the resistance by the fin part forming groove 13 is eliminated, and the flow of the billet 40 becomes uniform, and as a result, the plurality of fin parts 3 can be easily extruded in a stable posture.

  (2) Since the billet 40 contacts only the groove entrance 13A of the fin portion forming groove 13, the side wall portion 10A forming the fin portion forming groove 13 does not fall down or be damaged by the biased movement of the fin portion 3. As a result, the strength of the extrusion die 10 can be ensured and the life can be extended.

  (3) Since the expansion shape of the plurality of fin portion forming grooves 13 is a shape that expands symmetrically with respect to the center line C of each fin portion forming groove 13 in a cross section parallel to the base portion 12, the fin portion Processing of the forming groove 13 is easy.

  (4) The expansion shape of the plurality of fin part forming grooves 13 is an angle in the direction of escaping from the center line C of the fin part forming groove 13 with respect to the orthogonal line M perpendicular to the ridge part from the flange part of the groove entrance 13A. Since the shape is inclined at α °, the dimension between adjacent groove outlets 13B can be reduced, and the thickness of the side wall portion 10A forming the forming groove 13 can be maintained at a predetermined dimension. As a result, the strength of the die 10 can be maintained and the life of the die 10 can be extended.

  (5) A step S2 between one side wall surface 11C continuous to the base portion forming hole 12 in the side wall surface 11B forming the chamber 11 and the thickness of the space forming the base portion forming hole 12 forms the base portion 2. Since it is 1/5 or less of the thickness of the space and the frictional force increases between the extruded billet 40 and the one side wall surface 11C, the flow of the billet 40 at the stage before reaching the base portion forming hole 12 Can be adjusted to slow down. As a result, the flow rate of the billet 40 can be made uniform between the fin part forming grooves 13 and the aluminum profile 1 having a stable and accurate posture can be manufactured.

  (6) Since the fin portion forming groove 13 has a shape that uniformly expands from the groove inlet 13A on the upstream side in the extrusion direction of the billet 40 toward the groove outlet 13B on the downstream side, there is a step as in the prior art. Since it is not necessary to provide an escape passage, the lack of rigidity due to the provision of a relief passage with a step can be solved, and the falling of the fin portion 3 due to the improvement in rigidity can be suppressed.

  While the present invention has been described with reference to the above embodiment, the present invention is not limited to the above embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention. Further, the invention of the present application includes a combination of part or all of the configurations of the above-described embodiments as appropriate.

For example, in the said embodiment, although the fin part shaping | molding groove | channel 13 was made into the shape which expands toward the downstream from the extrusion direction upstream of each billet 40, not only this but a shape as shown in FIG. Good.
That is, the fin part forming groove 33 of this modified form is connected to the widening groove part 33C formed on the groove entrance 33A side of the fin part forming groove 33 and the widening groove part 33C and the widening groove part 33C. And a parallel groove 33B provided between the groove outlet 33D.

The expanded groove 33C has a shape that is expanded at an angle similar to that of the above-described embodiment only at a predetermined interval L from the groove inlet 33A toward the groove outlet 33B, and the tip from the end is parallel to the extrusion direction. It is a simple shape.
And in such a deformation | transformation form, compared with the width dimension W2 of the groove exit 13B of the fin part shaping | molding groove 13 of the said embodiment, the width dimension W4 of the groove outlet 33B in the parallel groove part 33B of the fin part shaping | molding groove 33 is made small. be able to. As a result, since the interval P1 between the fin portions 3 can be reduced, the number of fin portions 3 can be increased even when the width dimension of the finned aluminum profile 1 is limited. It is possible to manufacture a heat sink that can obtain a good heat dissipation effect.

  Moreover, in the said embodiment, as shown in FIG. 3, although bottom part 13C of the several fin part shaping | molding groove | channel 13 was formed in the inclination | tilt angle (alpha) degrees continuous from the extrusion direction upstream of the billet 40 to the downstream, it is not restricted to this. Absent. For example, it is good also as inclination-angle (alpha) degree to the middle of the groove | channel 13 similarly to the fin part shaping | molding groove | channel 13 of the said 1st modification.

Furthermore, in the said embodiment, it is going to improve the flow of the billet 40 in the fin part 3 by making each fin part shaping | molding groove | channel 13 into the shape which expands toward the groove exit 13B from the groove entrance 13A. However, it is not limited to this. As shown in FIG. 7, a plurality of ultrasonic transmitters 70 may be provided on the upper surface of the extrusion die 10 so as to correspond to the bottom portion 13 </ b> C of each fin portion forming groove 13.
In this way, the billet 40 extruded into each fin portion forming groove 13 is transmitted with fine vibrations by ultrasonic waves having a peeling function, so that the flow of the billet 40 becomes smooth, and as a result, there is no bending or the like. The fin portion 3 in the posture can be formed.
In this case, the bottom portion 13C of each fin portion forming groove 13 does not have to have an inclination angle α ° as in the embodiment and the modified embodiment.

  The extrusion die of the present invention is used when manufacturing a finned aluminum profile used as a heat sink (heat radiating member) of electronic equipment such as personal computers and audio equipment.

DESCRIPTION OF SYMBOLS 1 Aluminum shape member with fin 2 Base part 3 Fin part 10 Extrusion die 11 Chamber 11A which is a billet guide concave part 11B Bottom surface 11B Chamber side wall 11B One side wall surface of chamber 12 Base part molding hole 13 Fin part molding groove 13A Groove Entrance 13B Groove outlet 20 Aluminum profile manufacturing device 40 Billet α ° Inclination angle of groove expansion S2 Step A A Billet extrusion direction

Claims (5)

With respect to an aluminum profile comprising a base portion having a rectangular cross section and continuous in one direction, and a plurality of fin portions formed integrally and continuously with the base portion on one surface of the base portion. An extrusion die for extruding this,
A billet guide recess provided on the upstream end surface of the aluminum shape billet in the extrusion direction and guiding the movement of the billet;
A through hole for forming a base part that communicates with the concave part for guiding the billet and that is continuously provided toward the downstream side in the extruding direction and forms the base part;
A plurality of fin part forming grooves that communicate with the billet guide concave part and that are continuously provided toward the downstream side in the extrusion direction and that have one end of the opening communicating with the base part forming through-hole and forming the plurality of fin parts. And having
An extrusion die characterized in that each of the plurality of fin part forming grooves has a shape that uniformly expands from a groove inlet on the upstream side in the extrusion direction of the billet toward a groove outlet on the downstream side. In the extrusion die according to claim 1,
An extrusion die characterized in that the expanded shape of the plurality of fin portion forming grooves is a shape that expands symmetrically with respect to a center line of each fin portion forming groove in a cross section parallel to the base portion. In the extrusion die according to claim 1 or 2,
An extrusion die characterized in that the bottoms of the plurality of fin part forming grooves are inclined from the groove inlet toward the groove outlet. In the extrusion die according to any one of claims 1 to 3,
The plurality of fin part forming grooves are provided between the widened groove part formed on the groove entrance side of the fin part forming groove and the widened groove part and between the widened groove part and the groove outlet. An extrusion die characterized by being formed with the parallel groove portions formed. In the extrusion die according to any one of claims 1 to 4,
Of the side wall surfaces forming the billet guide recess, a step between one side wall surface connected to the base portion forming hole and the thickness of the space forming the base portion forming hole is equal to the thickness of the space forming the base portion. An extrusion die characterized by being 1/5 or less.

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