Die assembly tool for extrusion molding

a technology of extrusion molding and die assembly, which is applied in the direction of extrusion dies, manufacturing tools, metal extrusion, etc., can solve the problems of difficulty in achieving a sufficiently long die life, achieve the effect of reducing the pressing resistance of metallic materials, improving the pressure resistance of dies, and smooth introduction of metallic materials

Inactive Publication Date: 2010-04-22
SHOWA DENKO KK
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0046]According to the extrusion die assembly of the aforementioned invention [1], since a metallic material is accumulated in the material accumulating portion provided outside the porthole, flowing metallic material will be guided by the same accumulated material, resulting in smooth introduction of the metallic material in the porthole. Thus, the pressing resistance of the metallic material can be reduced, which in turn can improve the pressure resistance of the die.
[0047]According to the extrusion die assembly of the aforementioned invention [2], since the pressure receiving surface of the extrusion die is formed into a convex configuration, the pressing force of the metallic material can be received by the pressure receiving surface in a dispersed manner when the metallic material is pressed against the pressure receiving surface, which in turn can reduce the pressing force in the normal direction at each portion of the pressure receiving surface. As a result, the strength against the pressing force of the metallic material can be improved, resulting in further improved durability. In other words, in cases where the metallic material is pressed against the pressure receiving surface of a convex configuration, since a compressing force toward the central axis is applied to each portion of the pressure receiving surface, the shearing force to be generated in the die case at the time of extrusion will be reduced. As a result, the shearing forces generated at the positions of the die case exposed to the hollow portion of the die case, which are portions where the largest shearing force will be generated, can be reduced, which in turn can improve the strength of the extrusion die against the pressing force of the metallic material.
[0048]According to the extrusion die assembly of the aforementioned inventions [3] to [6], it becomes possible to accumulate the metallic material in the material accumulating portion in a desired manner. Thus, the aforementioned effects can be secured assuredly.
[0049]According to the extrusion die assembly of the aforementioned inventions [7] and [8], since a plurality of dies are arranged, the pressing force of the metallic material can be dispersed in each die, resulting in further improved pressure resistance.
[0050]According to the extrusion die assembly of the aforementioned invention [9], the pressing force of the metallic material can be received more assuredly by the pressure receiving surface in a dispersed manner. Thus, the durability can be improved assuredly.
[0051]According to the extrusion die assembly of the aforementioned invention [10], the pressing force of the metallic material against the pressure receiving surface can be dispersed in a balanced manner more assuredly, which can improve the strength against the pressure force of the metallic material more assuredly. In other words, in cases where the metallic material is pressed against the pressure receiving surface of a convex configuration, since a compressing force toward the central axis is applied to each portion of the pressure receiving surface more assuredly, the shearing force to be generated in the die case at the time of extrusion will be reduced more assuredly. As a result, the shearing forces generated at the positions of the die case exposed to the hollow portion of the die case, which are portions where the largest shearing force will be generated, can be reduced, which in turn can more assuredly improve the strength of the extrusion die against the pressing force of the metallic material.

Problems solved by technology

In such extrusion dies, large stress due to pressing of the metal billet is applied to the billet pressure receiving surface 1b of the male die 1, causing generation of cracks in the periphery of the pressure receiving portion of the die by the stress, which may sometimes make it difficult to attain sufficiently long die life.

Method used

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  • Die assembly tool for extrusion molding
  • Die assembly tool for extrusion molding
  • Die assembly tool for extrusion molding

Examples

Experimental program
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Effect test

example 1

[0175]A die assembly P1 corresponding to the aforementioned embodiment (see FIGS. 1 to 4) was prepared. In the die 10 of this die assembly P1, two portholes 24 were formed in the pressure receiving portion 21 at both sides of the thickness direction of the extrusion hole 11. The inclination angle θ of this porthole 24 was set to 20°. The billet pressure receiving surface 22 was formed into a ½ spherical configuration having a radius of 30 mm.

[0176]In this die mounting plate 60, no cut-out processing was performed at the inlet side periphery of the die mounting hole 61. Therefore, the inner periphery of the die mounting hole 61 constituted a peripheral wall surface of the aluminum accumulating portion 70. The peripheral wall surface of the aluminum accumulating portion 70 extended in parallel with the central axis A1 of the die 10.

[0177]The male die 30 was adjusted to 2.0 mm in height (thickness) of the mandrel 31, 19.2 mm in width of the mandrel 31, 1.2 mm in height of the passage f...

example 2

[0181]A die assembly P2 corresponding to the first modified embodiment (see FIG. 14) was prepared. In this die assembly P2, the inlet side peripheral portion of the die mounting hole 61 of the die mounting plate 60 was removed in a chamfered manner to thereby form a removed portion 72 at the upstream side external periphery of the aluminum accumulating portion 70. The inner peripheral wall surface 73 of this removed portion 72 was formed into a tapered surface which gradually decreased in diameter toward the downstream side.

[0182]Other than the above, the same evaluations as mentioned above were performed by executing extrusion in the same manner as mentioned above. The results are shown in Table 1.

example 3

[0183]A die assembly P3 corresponding to the second modified embodiment (see FIG. 15) was prepared. In this die assembly P3, the inlet side peripheral portion of the die mounting hole 61 of the die mounting plate 60 was removed in a stepped manner (an L-shaped manner) to thereby form a removed portion 72 at the upstream side external periphery of the aluminum accumulating portion 70. The inner peripheral wall surface 73 of this removed portion 72 extended in parallel with the central axis A1 of the die 10.

[0184]Other than the above, the same evaluations as mentioned above were performed by executing extrusion in the same manner as mentioned above. The results are shown in Table 1.

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Abstract

A die assembly P1 is configured such that an extrusion die 10 is mounted in a die mounting hole 61 formed in a die mounting plate 60 and a metallic material introduced in the die mounting hole 61 is introduced in the extrusion die 10 via a porthole 24 formed in a metallic material pressure receiving surface 22 of the die 10. A material accumulating portion 70 extending to a point on a more extrusion directional downstream side than an inlet position of the porthole 24 is provided outside the porthole 24 in the die mounting hole 61 to accumulate a part 75 of the metallic material introduced into the die mounting hole 61.

Description

TECHNICAL FIELD[0001]The present invention relates to an extrusion die assembly used for extruding a metal material, and its related art.BACKGROUND ART[0002]As an extrusion die (die set) used for manufacturing a metallic hollow extruded product, such as, e.g., an aluminum heat exchanging tube for use in car air-conditioning heat exchangers, there are a die called a porthole die as shown in FIG. 19A, a die called a spider die as shown in FIG. 19B, or a die called abridge die as shown in FIG. 19C.[0003]These extrusion dies are constructed such that a male die 1 and a female die 2 are combined with the mandrel 1a of the male die 1 disposed in the corresponding die hole 2a of the female die 2 to define a circular extrusion hole by and between the mandrel la and the die hole 2a. In the die, it is configured such that a metal billet (metallic material) pressed against the billet pressure receiving surface (metallic material pressure receiving surface 1b) of the male die 1 is introduced in...

Claims

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Application Information

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IPC IPC(8): B21C25/02B21C23/04
CPCB21C25/00B21C23/085B21C25/02
InventorHIRAMOTO, KIMIHISASAKIHAMA, HIDEKAZU
OwnerSHOWA DENKO KK