KR20040075855A - Extrusion tool, method for manufacturing shaped article with fins, and heat sink - Google Patents

Abstract

The extrusion tool 10 according to the present invention is disposed on a die main body 20 having a shaping hole 21 for forming an outer shape of the molded product 1 and upstream of the die main body 20. A plate member 30, wherein the shaping hole 21 includes a substrate forming portion 22 corresponding to the substrate 2 and a fin forming portion 23 corresponding to the fin 3. The plate member 30 has a material passage 31 which penetrates in the front-rear direction and communicates with an upstream opening of the shaping hole of the die main body 20. The plate member 30 is one or more perpendicular such that the plate member 30 intersects the substrate forming portion 22 of the shaping hole 21 in the thickness direction of the substrate 2 with the plate member 30 engaged with the die main body 20. The partitions 33 and 34 are provided, whereby the material passage 31 is divided into a plurality of small passages 31a, 31b, 31c, 31d, 31e, and 31f. By using an extrusion tool for extruding molded articles having fins such as heat sinks, good flatness of the substrate can be obtained.

Description

EXTRUSION TOOL, METHOD FOR MANUFACTURING SHAPED ARTICLE WITH FINS, AND HEAT SINK}

As one of heat dissipation members used for an electronic device or the like, as shown in FIG. 6, an aluminum heat sink having a plurality of thin fins 3 arranged in a comb-teeth shape on one side of the substrate 2 ( 1) may be exemplified. This heat sink 1 is used in such a way that the heating element is attached to the other side 2a of the substrate 2.

In this heat sink 1, the fins 3 are required to have a large tong ratio in order to improve heat dissipation performance, and the other side of the substrate 2 is a heat generating element in order to suppress heat conduction from the heat generating element. Is required to be flat so that it can be attached in a tight fit manner.

In many cases, as shown in FIG. 3, such a heat sink 1 has a die having bearing holes 21 corresponding to the circumferential shape of the heat sink because of the advantage of being able to manufacture in fewer processes. It is manufactured by the extrusion method using 50. The shaping hole 21 is composed of a substrate forming portion 22 corresponding to the substrate 2 and a fin forming portion 23 corresponding to the fin 3.

Moreover, in general, when extruding a complex shaped article, non-uniform flow resistance of the extruded material occurs depending on the width of the part 50 of the die 50 and the distance from the part surface, which causes the extruded product to differ in material flow rate. A problem may arise that may have defects such as curvature and distortion. One of the countermeasures to these defects is to adjust the overall material flow balance by increasing the flow resistance by increasing the length of the part in the portion with the lower flow resistance.

The above-mentioned problem also occurs when extruding the heat sink 1, and thus the flow balance is adjusted by changing the length of the shaping part to obtain the high flatness and the high ratio of the substrate 2. Specifically, in order to obtain the fin 3 having a high through ratio, the shaping length of the substrate forming portion 22 generating smaller flow resistance is adjusted to be set larger than the shaping length of the fin forming portion 23. . In addition, in order to obtain the flatness of the substrate 2, the flow balance is adjusted by increasing the shape length of the middle portion of the widthwise middle portion of the substrate forming portion 22, which generates a flow resistance smaller than the flow resistance at both ends.

However, in setting the shape length to obtain the flatness of the substrate 2, not only the size of the substrate 2 but also other factors such as the overall shape including the pins 3, the extrusion conditions and the type of material have to each other. Because it affects a complex way, multiple tests must be repeated to address the problem individually. Thus, setup is a time consuming and cumbersome task. Moreover, the wider width W of the substrate 2 results in a larger flow resistance difference between the end and the widthwise middle portion, and the deformation tends to occur and the degree of deformation is large. Therefore, the work for setting the shape part length becomes complicated.

Moreover, in many cases, satisfactory flatness is difficult to obtain with regard to intimate contact with the heat generating element even when the length of the shaping portion of the substrate forming portion 22 is adjusted after the cumbersome operation. Thus, flatness is obtained by further performing post-treatment. In the post-processing, the rolled product is subjected to roll straightening so as to obtain an approximately straight product, and then its fixed surface 2a to be attached to the heating element is ground. However, the higher the pin 3 is obtained, the more difficult the roll straightening operation is. Thus, the method described above is not a countermeasure for achieving complete flatness of the substrate 2. In other words, the method described above is not a countermeasure for reliably manufacturing a heat sink having excellent heat dissipation performance.

Related Applications

This application claims priority to Japanese Patent Application Nos. 2001-386176, filed December 19, 2001 and US Provisional Application No. 60 / 352,597, filed January 31, 2002, the disclosures of which are hereby incorporated by reference. do.

This application is directed to US 35 U.S.C. 35 U.S.C. of the filing date of US Provisional Application No. 60 / 352,597, filed January 31, 2002, pursuant to § 111 (b). 35 U.S.C. Claiming Benefits Under §119 (e) (1) Corresponds to US application filed under § 111 (a).

The present invention relates to an extrusion tool for producing a molded article having a plurality of thin fins arranged on a substrate, a method for producing a molded article having a pin using the extrusion tool, and a heat sink produced by the method.

1 is a rear view showing an embodiment of an extrusion tool according to the present invention, as seen from the rear end of the plate member constituting the extrusion tool.

FIG. 2 is a cross sectional view taken along line II-II of FIG. 1 showing an extrusion process of a heat sink using the extrusion tool shown in FIG.

Fig. 3 is a perspective view showing the die main body seen from the rear upper side thereof.

Fig. 4 is a perspective view showing the plate member seen from the front upper side thereof.

FIG. 5 is a cross-sectional view taken along the line V-V of FIG. 1 showing the extrusion process of the heat sink using the extrusion tool shown in FIG.

6 is a perspective view showing a heat sink manufactured by the extrusion tool shown in FIG.

In view of the above technical background, the present invention provides an extrusion tool capable of extruding a molded article having fins, such as a heat sink having a substrate having excellent flatness, a method of manufacturing a molded article having fins using the extrusion tool, and It is an object to provide a heat sink manufactured by this method.

For reference, in this specification, the term "front" or "front end" refers to the exit side of the extruded material or the direction of movement of the extruded material, while the term "rear" or "rear end" refers to the inlet or extrusion of the extruded material. The direction opposite to the moving direction of the material is shown.

According to a first aspect of the present invention, there is provided a substrate (2) for extruding a molded article (1) having fins with a plurality of thin pins (3) arranged in a comb shape on one side of the substrate (2). Extrusion tool 10,

A die main body 20 having a shaping hole 21 for forming an outer shape of the molded product 1,

A plate member 30 disposed downstream of the die main body 20,

The shaping hole 21 includes a substrate forming portion 22 corresponding to the substrate 2 and a fin forming portion 23 corresponding to the fin 3,

The plate member 30 has a material passage 31 penetrating in the front-rear direction and communicating with an upstream opening of the shaping hole 21 of the die main body 20,

The plate member 30 is at least one vertical such that the plate member 30 intersects the substrate forming portion 22 of the shaping hole 21 in the thickness direction of the substrate 2 with the plate member 30 engaged with the die main body 20. It is a extrusion tool provided with the partitions 33 and 34 and by which the material passage 31 is divided into the several small passage 31a, 31b, 31c, 31d, 31e, 31f.

Preferably, two or more vertical bulkheads 33, 34 are provided in the material passage 31 of the plate member 30.

Preferably, merging spaces 37a, 37b in communication with the plurality of small passages 31a, 31b, 31c, 31d, 31e, 31f are provided downstream of the material passage 31 of the plate member 30. Do.

The vertical bulkheads 33 and 34 are preferably formed to intersect the fin formation part 23.

It further comprises a horizontal partition wall 32 formed in the material passage 31 of the plate member 30, the horizontal partition wall 32 is formed by the substrate forming portion (with the plate member 30 coupled to the die main body 20) It is preferably located at the boundary between 22) and the pin formation 23.

The horizontal partition wall 32 is formed to have an inclined surface 35 at the front portion facing the substrate forming portion 22, and the inclined surface 35 is inclined toward the fin forming portion 23.

The die main body 20 preferably includes a recess 24 formed in an upstream portion thereof and communicating with the shaping hole 21 to introduce the extruded material into the shaping hole 21.

According to a second aspect of the present invention, there is provided a molded article manufacturing method having a plurality of thin pins (3) arranged in a comb-tooth shape on one side of a substrate (2),

An extrusion tool comprising a die main body 20 having a shaped hole 21 for forming an outer shape of the molded product 1 and a plate member 30 disposed upstream of the die main body 20 ( 10) preparing the step,

The extrusion tool 10 is adapted such that the extrusion material divided into the small passages 31a, 31b, 31c, 31d, 31e, 31f of the plate member 30 is merged, pressed and fixed and then extruded through the shaping hole 21. Extruding the extruded material using;

The shaping hole 21 includes a substrate forming portion 22 corresponding to the substrate 2 and a fin forming portion 23 corresponding to the pin 3, and the plate member 30 penetrates in the front-rear direction. And a material passage 31 in communication with an upstream opening of the shaping hole 21 of the die main body 20, wherein the plate member 30 has a plate member 30 engaged with the die main body 20; One or more vertical bulkheads 33 and 34 so as to intersect the substrate forming portion 22 of the shaping hole 21 in the thickness direction of the substrate 2 in a state, whereby the material passage 31 is formed by a plurality of small A molded article manufacturing method having pins divided into passages 31a, 31b, 31c, 31d, 31e, and 31f.

The extruded material is preferably aluminum.

It is preferable that the molded article having a plurality of thin plate fins is a heat sink.

According to a third aspect of the present invention, it is a heat sink manufactured by the above-described method.

In the extrusion tool according to the present invention, since the flow resistance is uniform in the width direction of the substrate forming portion of the shaping hole, an accurate shaping hole size can be obtained. Thus, a substrate with high flatness can be obtained.

If two or more vertical bulkheads are provided in the extrusion tool, the flow resistance is more uniform, whereby a substrate with good flatness can be formed.

Moreover, in the case where a merging space communicating with the small passage is provided downstream of the material passage of the plate member, merging of the extruded material can be performed in the plate member.

Moreover, when a vertical bulkhead is provided to intersect the fin formation, the flow resistance difference can be reduced.

When the horizontal bulkhead is formed in the material passage of the plate member so that the plate member is positioned at the boundary between the substrate forming portion and the pin forming portion with the die main body engaged, the flow rate in the pin forming portion can be adjusted and thus high flow ratio A pin having may be preferably formed.

The horizontal partition wall is preferably formed to have an inclined surface that is inclined toward the pin formation portion. This may increase the flow amount toward the substrate formation.

In order to guide the extruded material into the shaping hole, it is preferable that a recess communicating with the shaping hole is formed upstream of the die main body. In this case, the merging of the extruded materials may be performed in the die main body.

According to the method of manufacturing a molded article with a pin of the present invention, the extrusion material divided into small passages in the plate member and fed through is merged, pressed and fixed, and then extruded through the shaping hole. Therefore, the flow resistance in the width direction of the substrate forming portion of the shaping hole can be made uniform. Thus, the precise size of the shaped hole can be obtained to form a substrate with high flatness, which makes it possible to obtain a predetermined flatness without post-treatment.

Molded article manufacturing methods with fins may be preferably applied when aluminum is used as the extrusion material.

In addition, the molded article with fins is preferably a heat sink. Heat sinks that have good heat dissipation performance and can be tightly fitted to the heating element can be manufactured due to the good flatness of the substrate. Therefore, since no post-treatment to obtain flatness is required, an excellent heat sink can be manufactured in an easy process.

Since the heat sink according to the present invention is manufactured as described above, the heat sink can be closely fitted to the heat generating element, thereby providing excellent heat dissipation performance.

1 to 5 show according to the invention that a plurality of thin fins 3 are used to extrude an aluminum heat sink 1 which is arranged in a comb teeth on one side of a thick substrate 2 as shown in FIG. One embodiment of an extrusion tool 10 is shown. 2 and 5, reference numeral “40” denotes a container and “41” denotes an extruded material loaded in this container 40.

The extrusion tool 10 includes a die main body 20 and a plate member 30 associated with the die main body 20.

As shown in FIGS. 1-3 and 5, the die main body 20 has a shaping hole 21 for forming the outer periphery of the heat sink 1. The shaping hole 21 is composed of a substrate forming portion 22 corresponding to the substrate 2 and a fin forming portion 23 corresponding to the fin 3. The recessed portion 24 formed behind the shaped hole 21 is for introducing the extruded material into the shaped hole 21.

As shown in Figs. 1, 2, 4 and 5, the plate member 30 penetrates in the front-rear direction to guide the extruded material to the rear opening of the recess 24 of the die main body 20. It has a material passageway 31. The material passage 31 is divided into six individual small passages 31a, 31b, 31c, 31d, by a horizontal bulkhead 32 disposed at a vertical bisecting position and two vertical partitions 33, 34 arranged at a horizontal third position. 31e, 31f).

In the state where the plate member 30 is engaged with the die main body 20, as shown in Figs. 1 and 2, the horizontal bulkhead 32 is inclined at its distal end inclined toward the pin forming portion 23. In the state where the 35 is formed, it is located close to the boundary between the pin forming portion 23 and the substrate forming portion 22 of the die main body 20, the front end surface 36 of which is the front of the plate member 30. It is located in the same plane as the end face. The horizontal bulkhead 32 divides the extruded material 41 into upper small passages 31a, 31b, 31c and lower small passages 31d, 31e, 31f before introducing the extruded material into the die main body 20. When the extruded material is introduced into the die main body 20, the inclined surface 35 of the horizontal bulkhead 32 is formed of the extruded material toward the plate forming portion 22 due to the expanded cross-sectional area of the lower passages 31d, 31e, and 31f. Increase the flow

In the state in which the plate member 30 is engaged with the die main body 20, the vertical partition walls 33 and 34 described above are formed such that the shaping hole 21 is divided into three in the width W direction of the substrate 2. It is disposed perpendicular to the substrate forming portion 22 and the pin forming portion 23 at the position. These vertical bulkheads 33 and 34 are located behind the front end face of the plate member 30. At the front end face of the material passage 31, the three small passages 31a, 31b, 31c at the top communicate with each other to form an upper merging space. Similarly, the lower three small passages 31d, 31e, 31f communicate with each other to form the lower merging space 37b. Vertical bulkheads 33 and 34 pass extruded material 41 into the upper left and lower small passages 31a and 31b, the central upper and lower small passages 31b and 31e and the upper right and lower small passages 31c and 31f. Divide. The extruded material 41 divided into three horizontal flows through these upper (lower) small passages 31a, 31b, 31c (31d, 31e, 31f) is merged in the merging spaces 37a, 37b. Pressurized and integrally fixed (see FIG. 5).

Therefore, in the extrusion tool 10 with the die main body 20 and the plate member 30 engaged, the extrusion material flows and the heat sink 1 is formed as follows.

The extruded material 41 in the vessel 40 is divided into six individual miniature passages 31a, 31b, 31c, 31d, 31e, 31f of the plate member 30 and passes therethrough, and the extruded material 41 has a top small size. After passing through the passages 31a, 31b, 31c, the extruded material 41 merged in the upper merging space 37a, pressurized and integrally fixed to each other, and passed through the lower small passages 31d, 31e, 31f is merged downward. In the space 37b, they are merged, pressed and fixed integrally. That is, the extruded material 41 divided into six in the horizontal and vertical directions at the downstream end of the plate member 30 is joined in the upper and lower merging spaces, respectively, to generate two flows, namely the upper flow and the lower flow. . These two flows are then merged and pressed in the recess 24 of the die main body 20 and are integrally fixed. Thus, the extrusion material 41 is integrally extruded through the shaping hole 21 to form a heat sink 1 of a predetermined shape.

As the extruded material passes through the passage 31 of the plate member 30, a relatively large flow resistance occurs at the portion adjacent the lateral end of the passage 31 and adjacent to the vertical bulkheads 33, 34. On the other hand, relatively small flow resistances occur at portions spaced from them. Thus, the flow resistance is different along the transverse direction of the passage. The difference in this flow resistance is that the extruded material passing through three laterally arranged small passages 31a, 31b, 31c is merged in the merge spaces 37a, 37b and then the upper merge space 37a and the bottom merge. The extrusion material passing through the space 37b gradually decreases as it merges in the recesses 24 of the die main body 20. The merged extrusion material is then introduced into the shaping hole 21 with the flow balance substantially uniform. As a result, the flow resistance in the width direction of the substrate forming portion 22 of the shaping hole 21 is uniform, and extrusion can be performed with the size of the shaping hole being accurately reflected, thus having a high flatness. Substrate 2 may be formed.

In the plate member 30 according to the present embodiment of the present invention, in addition to the above-mentioned vertical partition walls 33 and 34, horizontal partition walls 32 are formed. This horizontal bulkhead 32 contributes to the formation of a fin having a high aeration ratio since it divides the extruded material 41 into upper and lower flows, thereby creating an increased flow resistance in the fin forming section 23. In addition to the substrate 2 having flatness formed by the above-described vertical partitions 33 and 34, the fin 3 having a high through ratio can be formed by the horizontal partition 32. This makes it possible to extrude a heat sink with good heat dissipation performance.

However, the extrusion tool according to the present invention is not limited to the embodiment described above.

One or more vertical partition walls of the plate member 30 may reduce the difference in flow resistance in the width direction of the substrate forming portion 22. Preferably, two or more vertical bulkheads 33, 34 of the plate member 30 are provided. The appropriate number of vertical bulkheads 33, 34 is changed depending on the width W of the substrate 2. The larger the width W, the greater the number of vertical bulkheads 33 and 34. However, too many vertical bulkheads 33 and 34 may cause inconvenience such as deterioration of the bulkhead's strength due to too large flow resistance as a whole and / or its narrow width. For example, the number of vertical bulkheads is preferably two or three when the width W of the substrate 2 is about 300 mm.

Moreover, in the above-described embodiment, vertical partitions 33 and 34 are provided to intersect the substrate forming portion 22 and the fin forming portion 23 of the shaping hole 21, but these walls are formed at least in the substrate forming portion ( 22) may be provided to intersect. However, these walls are preferably arranged to intersect the substrate forming portion 22 and the fin forming portion 23 to reduce the difference in flow resistance.

Moreover, in the above-mentioned extrusion tool 10, the merging of the extrusion material 41 divided in the horizontal direction is performed in the upper and lower merging spaces of the plate member 30 and the merging of the extrusion material 41 divided in the vertical direction. Although performed in the recess 24 of the die main body 20, the position for merging the extruded material is not limited thereto. For example, merging of the extruded material in the vertical direction may be performed on the plate member 30, and a die main body having a shaping hole formed in its rear face may be engaged with the plate member. Alternatively, an additional plate member having an extrusion material merging space may be disposed between the die main body 20 and the plate member 30.

Moreover, in the extrusion tool according to the present invention, the shape of the substrate forming portion 22 of the die main body 20, or the shape of the substrate of the extruded product having the pin is not limited to the flat plate shape described above. For example, in the present invention, the substrate forming portion or the substrate of the extruded product may have a leg or the like for attaching it to the heating element.

According to the method for producing a shaped article with a pin, an extrusion tool 10 is used and the extrusion is supplied in a split manner through the small passages 31a, 31b, 31c, 31d, 31e, 31f of the plate member 30. The material is merged and then extruded through the shaping hole 21. Thus, the flow resistance in the width direction of the substrate forming portion 22 becomes uniform, which enables the production of a molded article with fins having the substrate 2 of excellent flatness. Thus, predetermined molded articles with pins can be produced without performing post treatments such as roll straightening and / or grinding.

Molded articles having such pins can be preferably produced when the extrusion material is aluminum. The type of aluminum is not limited to a specific one, and it is high purity aluminum, JIS A1000 series aluminum or alloy thereof, Al-Cu alloy of JIS A2000 series, Al-Mn alloy of JIS A3000 series, Al-Si alloy of JIS A4000 series , Al-Mg alloy of JIS A5000 series, Al-Si-Mg alloy of JIS A6000 series, Al-Zn-Mg-Cu or Al-Zn-Mg alloy of JIS A7000 series and the like can be variously selected. .

Moreover, it is possible to obtain a substrate which is suitably used for producing a heat sink and has excellent flatness. Thus, heat sinks having good contact with various types of heat generating elements can be produced only by extrusion. As the heat sink material, JIS A 6000 aluminum alloy, especially JIS A6063 aluminum alloy, which has good extrudability and thermal conductivity can be recommended.

Yes

Extrusion experiments were performed using various types of extrusion tools in which the number of vertical bulkheads of the extrusion tool 1 and the plate member 30 shown in FIGS.

In the heat sink, the width W of the substrate 2 is set to 299.8 mm, the thickness T of the substrate 2 is set to 6.5 mm, and the thickness FT of the fin 3 is set to 1.5 mm. The height FH of the pin 3 is set to 15.5 mm, and the pin pitch FP is set to 4.2 mm.

In the extrusion tool 10, the die main body 20 forms a hole in the shaping portion 21 having a size corresponding to the size of the fin forming portion 23 and the substrate forming portion 22 of the heat sink 1 described above. It is formed to have. The depth of the recessed part 24 is set to 10 mm.

A plate member 30 having a common horizontal partition 32 and four different numbers of vertical partitions as shown below is prepared and joined with the die main body 20. In the horizontal bulkhead 32, the thickness S1 is set to 26 mm, the width S2 of the tip surface 36 is set to 4 mm, and the inclination angle θ of the inclined surface 35 is set to 45 degrees (Fig. 2). Furthermore, in the vertical bulkhead, regardless of the number, the thickness S3 is set to 20 mm, the depth S4 of the merge spaces 37a and 37b is set to 40 mm and the thickness S5 of the plate member 30 is 130 mm is set (see Fig. 5).

(Example 1)

One vertical partition wall is formed at the widthwise center position of the material passage 31, that is, at the center of the substrate forming portion 22, with the plate member engaged with the die main body 10. As shown in FIG. Thus, the material passage 31 is divided into four by one vertical partition wall and one horizontal partition wall.

(Example 2)

Two vertical bulkheads are formed at a position where the material passage 31 is divided into three in the horizontal direction, that is, the position shown in FIG. Thus, the material passage 31 is divided into six by two vertical partition walls and one horizontal partition wall.

(Example 3)

Three vertical bulkheads are formed at positions where the material passages 31 are divided into four in the horizontal direction. Thus, the material passage 31 is divided into eight by three vertical partition walls and one horizontal partition wall.

(Comparative Example)

Vertical bulkheads are not formed. Thus, the material passage 31 is divided into two by only one horizontal partition wall.

Using the four types of extrusion tools described above, ten elongate molded articles having a length of 3100 mm are extruded each using JIS A6063 aluminum alloy as the extrusion material.

In each of the ten elongate shaped articles obtained, the flatness of the substrate is measured. The flatness is expressed by the difference between the highest position and the lowest position on the fixed surface 2a with respect to the heat generating element or the like. The minimum (meaning the best flatness) to the maximum value at each flatness of the ten long molded articles are shown in Table 1.

Table 1

Example 1 Example 2 Example 3 Comparative example Number of vertical bulkheads One 2 3 none Flatness (mm) 1.2 to 1.5 0.5 to 1.0 0.3 to 0.8 2.0 to 3.0

From the results shown in Table 1, it was found that the flatness of the substrate can be improved by providing one or more vertical bulkheads in the material passage of the plate member.

Moreover, in the heat sinks manufactured using the extrusion tools of Examples 1 to 3, the flatness of the substrate is at a satisfactory level with respect to the intimate contact with the heating element. In addition, there was no deformation of the pins and they were extruded in a satisfactory manner.

While exemplary embodiments of the invention have been described herein, the invention is not limited to the various preferred embodiments described herein, but as can be understood by those skilled in the art based on this specification, Includes any and all embodiments having omissions, combinations (eg, aspects over various embodiments), adaptations, and / or changes. The limitations of the claims are to be interpreted based on the broad terms of the language employed in the claims and are not limited to the examples described herein or these examples should be considered as non-exclusive during the implementation of the application. For example, in this specification, the term "preferred" means non-exclusive and "preferably but not limited to". Means-functions or step-function limitations are expressly recited in certain claim limitations as follows: a) "means for" or "steps for", b) expressly quoting corresponding functions. C) The structure, material or action that supports the structure is not cited, and will only be employed if all are present in the definition.

According to the extrusion tool of the present invention, since the material flow resistance in the width direction of the substrate forming portion of the shaping hole can be made uniform, a substrate having excellent flatness can be formed. Furthermore, since the flow resistance of the fin formation portion increases as compared with the flow resistance of the substrate formation portion, fins having a high through ratio can be formed. Thus, the substrate is suitably used for producing a heat sink in which the substrate can be in intimate contact with the heat generating element, and a heat sink having excellent heat dissipation performance can be obtained.

Claims (11)

An extrusion tool 10 for extruding a molded product 1 having a substrate 2 and a pin having a plurality of thin plate-like fins 3 arranged in a comb shape on one side of the substrate 2, A die main body 20 having a shaping hole 21 for forming an outer shape of the molded article 1, A plate member 30 disposed downstream of the die main body 20, The shaping hole 21 includes a substrate forming portion 22 corresponding to the substrate 2 and a fin forming portion 23 corresponding to the pin 3, The plate member 30 has a material passage 31 penetrating in the front-rear direction and communicating with an upstream opening of the shaping hole 21 of the die main body 20, The plate member 30 is adapted to form the substrate forming portion 22 of the shaped hole 21 in the thickness direction of the substrate 2 in a state in which the plate member 30 is engaged with the die main body 20. And at least one vertical bulkhead (33, 34) to intersect, whereby the material passage (31) is divided into a plurality of small passages (31a, 31b, 31c, 31d, 31e, 31f). 2. Extrusion tool according to claim 1, wherein at least two vertical bulkheads (33, 34) are provided in the material passages (31) of the plate member (30). The material passage 31 of the plate member 30 according to claim 1 or 2, wherein the merge spaces 37a, 37b communicating with the plurality of small passages 31a, 31b, 31c, 31d, 31e, 31f. An extrusion tool provided downstream of. The extrusion tool according to any one of claims 1 to 3, wherein the vertical partitions (33, 34) are formed to intersect the fin formations (23). The plate member 30 according to any one of claims 1 to 4, further comprising a horizontal partition wall 32 formed in the material passage 31 of the plate member 30, wherein the horizontal partition wall 32 is the plate member 30. ) Is positioned at the boundary between the substrate forming portion (22) and the pin forming portion (23) with the die main body (20) engaged. The horizontal partition wall 32 is formed so as to have an inclined surface 35 at the front portion facing the substrate forming portion 22, wherein the inclined surface 35 is An extrusion tool inclined toward the pin forming portion 23. The die main body (20) according to any one of claims 1 to 6, wherein the die main body (20) is formed upstream of the die main body (21) for introducing an extrusion material into the shaped hole (21). An extrusion tool having a recess 24 in communication with it. A molded article manufacturing method having a plurality of thin pins (3) arranged in a comb teeth on one side of a substrate (2), An extrusion comprising a die main body 20 having a shaped hole 21 for forming an outer shape of the molded product 1 and a plate member 30 disposed upstream of the die main body 20. Preparing the tool 10, The extrusion tool (s) such that the extrusion material divided into the small passages (31a, 31b, 31c, 31d, 31e, 31f) of the plate member (30) is merged, pressed and fixed and then extruded through the shaped hole (21). 10) extruding the extruded material, The shaping hole 21 includes a substrate forming portion 22 corresponding to the substrate 2 and a fin forming portion 23 corresponding to the pin 3, and the plate member 30 is in the front-rear direction. A material passage 31 penetrating and communicating with an upstream opening of the shaping hole 21 of the die main body 20, wherein the plate member 30 has the plate member 30 in the die main body. One or more vertical partitions 33 and 34 so as to intersect the substrate forming portion 22 of the shaping hole 21 in the thickness direction of the substrate 2 in a state of being coupled with the 20. A method for producing a molded article having pins in which the passages 31 are divided into a plurality of small passages 31a, 31b, 31c, 31d, 31e, 31f. The method of claim 8 wherein the extruded material is aluminum. The method according to claim 8 or 9, wherein the molded article having the plurality of thin plate fins is a heat sink. A heat sink produced by the method according to claim 10.