JP2008023595A - Extrusion die for metallic material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extrusion die for a metallic material which is excellent in durability and can obtain an extruded product with high quality. <P>SOLUTION: The die 10 comprises: a die holding case 20 having a bear part 21 with an outer surface thereof being a pressure receiving surface 22 and arranged with the pressure receiving surface 22 directed backwardly; a male die 30 held inside the die holding case 20; and a female die 40 held by a forward part in the die holding case 20. The metallic material pressure receiving surface 22 of the pressure receiving part 21 is formed in a backwardly projecting shape, and the pressure receiving surface 22 is constituted of a polyhedron. A porthole 24 is formed in the pressure receiving part 21, and the central axis A2 of the porthole 24 is inclined to the central axis A1 of the die holding case 20. The die 10 is constituted so that the metallic material pressed by the pressure receiving surface 22 is led into the die holding case 20 through the porthole 24 and passed through an extrusion hole 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a metal material extrusion die used for extrusion of a metal material and related technology.

  An extrusion die used for producing a metal hollow extruded product such as an aluminum heat exchange tube in a heat exchanger for a car air conditioner is a porthole die shown in FIG. 19 (a) and shown in FIG. There is a spider die, what is called a bridge die shown in FIG.

  These extrusion dies are configured by combining a male die (1) and a female die (2), and the mandrel (1a) of the male die (1) is the die of the female die (2). An annular extrusion hole is formed by the mandrel (1a) and the die hole (2a) arranged corresponding to the hole (2a). And the metal billet (metal material) pressed by the billet pressure receiving surface (metal material pressure receiving surface 1b) of the male die (1) flows into both dies (1) and (2) through the material introduction part (1c). Then, the extrusion material having a cross-sectional shape corresponding to the shape of the extrusion hole is molded by passing through the extrusion hole while being plastically deformed.

  In such an extrusion-molding die, a large amount of stress is applied to the billet pressure-receiving surface (1b) of the male die (1) by pressing the metal billet, so that cracks are likely to occur around the pressure-receiving portion. It may be difficult to obtain a sufficient die life.

Thus, conventionally, extrusion dies for metal materials shown in Patent Documents 1 and 2 below have been proposed. This die has a convex shape in which the billet pressure receiving surface of the male die protrudes to the opposite side (rear side) to the billet extrusion direction, and the pressing force of the metal billet applied to the billet pressure receiving surface is the male die. It is comprised so that it may receive by the bridge part.
Japanese Utility Model Publication No. 53-102938 (Claims, Fig. 3-5) Japanese Patent Publication No. 6-81644 (claims, drawings)

  Since the conventional extrusion dies shown in Patent Documents 1 and 2 have a billet pressure-receiving surface formed in a convex shape, the strength of the male die, such as pressure resistance against a metal billet, can be improved to some extent. I still have anxiety in the bridge. For this reason, in order to sufficiently secure the strength of the bridge portion, the thickness of the bridge portion in the male die must be increased, which not only increases the size and weight but also increases the cost. The problem of inviting occurs.

  In addition, in the extrusion die, particularly when extruding into a complicated shape, it is necessary to smoothly introduce a metal material into a stable state from the material introduction portion of the male die to the extrusion hole. In the extrusion die, the metal material flowing between the male die and the female die from the material introduction portion of the male die is disturbed by the bridge portion of the male die, preventing the smooth introduction of the metal material. The dimensional accuracy of the extrusion-molded product (extruded product) may be lowered, and it may be difficult to obtain high quality.

  The main object of the present invention is to eliminate the above-mentioned problems of the prior art and to achieve cost reduction and reduction in size and weight while ensuring sufficient strength and durability, and to obtain a high-quality extruded product. It is an object to provide a die for extrusion molding of a metal material.

  Other objects of the present invention are a method for producing an extruded product, a method for producing an extruded tube material, a method for producing a porous hollow material, a die holding case for a die for extrusion molding, and a method for extruding a metal material. And providing related technologies such as metal material extruders.

  In order to achieve the above object, the present invention has the following structure.

[1] A die holding case having a pressure receiving portion whose outer surface is a metal material pressure receiving surface, and disposed rearward so that the metal material pressure receiving surface of the pressure receiving portion faces the extrusion direction of the metal material;
A male die having a mandrel that is held inside the die holding case and is arranged corresponding to the axis of the die holding case;
A female die that is held at the front in the die holding case and provided with a die hole that forms an extrusion hole with the mandrel, and
While the metal material pressure-receiving surface in the pressure-receiving portion is formed in a convex shape protruding backward, the metal material pressure-receiving surface is constituted by a polyhedron,
A port hole for introducing a metal material is provided on the outer periphery of the pressure receiving part, and is inclined with respect to the axis of the die holding case so that the axis of the port hole approaches the axis of the die holding case as it goes downstream. Arranged to
A metal material extrusion die, wherein the metal material pressed against the metal material pressure-receiving surface is guided through the port hole into the die holding case and passes through the extrusion hole.

  [2] The metal material extrusion die according to item 1, wherein the metal material pressure-receiving surface is formed in a circumferential polyhedron in which a plurality of surfaces are arranged in the circumferential direction.

  [3] The metal material extrusion die according to item 1 or 2, wherein the metal material pressure-receiving surface is formed into an axial polyhedron in which a plurality of surfaces are arranged in the axial direction.

  [4] The item 1 described above, wherein the protrusion height of the pressure receiving portion to the rear is set to 0.3 to 1.5 times the radius of the circumscribed circle in the cross section at the outer peripheral edge position of the pressure receiving portion. The die for extrusion molding of the metal material according to any one of?

  [5] The die for extruding a metal material according to any one of items 1 to 4, wherein a plurality of port holes are formed at equal intervals in the circumferential direction around the axis of the die holding case. .

  [6] The die for extrusion molding of a metal material according to any one of items 1 to 5, wherein the port hole is disposed toward the extrusion hole.

  [7] The extrusion of the metal material according to any one of the preceding items 1 to 6, wherein the axis of the port hole is set at an inclination angle of 10 to 35 ° with respect to the axis of the die holding case. Die for molding.

  [8] The die for extruding a metal material according to any one of items 1 to 7, wherein the die holding case is provided with an annular base portion integrally with the pressure receiving portion at a front portion thereof.

  [9] The die for extrusion molding of a metal material according to any one of items 1 to 8, wherein the pressure receiving portion is formed in a polygonal pyramid shape.

  [10] The metal material extrusion die according to any one of [1] to [9], wherein the metal material is composed of aluminum or an alloy thereof.

[11] An annular extrusion hole is formed between the mandrel of the male die and the die hole of the female die,
11. The die for extrusion molding of a metal material according to any one of the preceding items 1 to 10, wherein the tube material having an annular cross section is extruded by passing the metal material through the extrusion hole. .

[12] A flat annular extrusion hole whose height (thickness) is small relative to the width is formed between the male die mandrel and the female die die hole,
The portion corresponding to the die hole in the mandrel is formed in a comb-like shape having a plurality of projections for forming a passage arranged side by side in the width direction,
11. The structure according to any one of the preceding items 1 to 10, wherein a porous hollow material in which a plurality of passages are provided in the width direction is extruded by passing a metal material through the extrusion hole. Dies for metal material extrusion.

  [13] A method for producing an extruded product, wherein the extruded product is molded using the extrusion die described in any one of 1 to 10 above.

  [14] A method for producing an extruded tube material, wherein the extruded tube material is molded using the extrusion die described in the above item 11.

  [15] A method for producing a porous hollow material, wherein the porous hollow material is molded using the extrusion die described in the above item 12.

[16] It has a pressure receiving portion whose outer surface is a metal material pressure receiving surface, and is arranged facing backward so that the metal material pressure receiving surface of the pressure receiving portion faces the extrusion direction of the metal material, while the male type inside A die holding case for an extrusion die for holding a die and a female die,
While the metal material pressure-receiving surface in the pressure-receiving portion is formed in a convex shape protruding backward, the metal material pressure-receiving surface is constituted by a polyhedron,
A port hole for introducing a metal material is provided on the outer periphery of the pressure receiving part, and is inclined with respect to the axis of the die holding case so that the axis of the port hole approaches the axis of the die holding case as it goes downstream. Arranged to
Extrusion characterized in that the metal material pressed against the metal material pressure receiving surface is guided into the die holding case through the port hole and passes through the extrusion hole between the male die and the female die. Die holding case for forming dies.

  [17] The preceding item 16 characterized in that the protruding height of the pressure receiving portion rearward is set to 0.3 to 1.5 times the radius of the circumscribed circle in the cross section at the outer peripheral edge position of the pressure receiving portion. A die holding case for the extrusion die described in 1.

[18] A method for extruding a metal material,
A die holding case that has a pressure receiving portion whose outer surface is a metal material pressure receiving surface, and is arranged facing rearward so that the metal material pressure receiving surface of the pressure receiving portion faces the extrusion direction of the metal material;
A male die having a mandrel that is held inside the die holding case and is arranged corresponding to the axis of the die holding case;
A female die that is held at the front portion in the die holding case and provided with a die hole that forms an extrusion hole with the mandrel; and
While forming the metal material pressure receiving surface in the pressure receiving portion into a convex shape protruding backward, the metal material pressure receiving surface is constituted by a polyhedron,
A port hole for introducing a metal material is provided on the outer periphery of the pressure receiving portion, and the port hole is inclined with respect to the axis of the die holding case so as to approach the axis of the die holding case as it goes downstream. So that
A method for extruding a metal material, characterized in that a metal material pressed against a metal material pressure-receiving surface is guided through a port hole into a die holding case and passed through an extrusion hole.

[19] A metal material extrusion molding machine comprising a container and an extrusion die set in the container, wherein the metal material in the container is supplied to the extrusion die.
The extrusion die is
A die holding case that has a pressure receiving portion whose outer surface is a metal material pressure receiving surface, and is arranged facing rearward so that the metal material pressure receiving surface of the pressure receiving portion faces the extrusion direction of the metal material;
A male die having a mandrel that is held inside the die holding case and is arranged corresponding to the axis of the die holding case;
A female die that is held at the front in the die holding case and provided with a die hole that forms an extrusion hole with the mandrel, and
While the metal material pressure-receiving surface in the pressure-receiving portion is formed in a convex shape protruding backward, the metal material pressure-receiving surface is constituted by a polyhedron,
A port hole for introducing a metal material is provided on the outer periphery of the pressure receiving part, and is inclined with respect to the axis of the die holding case so that the axis of the port hole approaches the axis of the die holding case as it goes downstream. Arranged to
A metal material extrusion molding machine characterized in that a metal material pressed against a metal material pressure receiving surface is guided into a die holding case through a port hole and passes through an extrusion hole.

  According to the metal material extrusion die of the invention [1], since the metal material pressure-receiving surface is formed into a convex shape made of a polyhedron, when the metal material is pressed against the pressure-receiving surface, the metal material pressure is pressed. Can be dispersed and received by each surface of the polyhedron, and the pressing force in the normal direction at each portion of the pressure receiving surface can be reduced. For this reason, the intensity | strength with respect to the pressing force of a metal material can be improved, and sufficient durability can be acquired.

  Furthermore, according to the present invention, the material receiving port hole is formed in the pressure receiving portion of the die holding case that covers the male die and the female die, that is, the front end (downstream side) wall portion of the pressure receiving portion is surrounded by the periphery. Since it is formed integrally in the direction, the strength of the die holding case, and thus the entire extrusion die, can be further improved by the presence of the continuous peripheral wall portion. As described above, the die of the present invention does not have a weak portion such as a conventional bridge portion, and it is not necessary to form a size such as a wall thickness larger than necessary for strength improvement. And cost can be reduced.

  In the present invention, the port hole is provided on the outer periphery of the pressure receiving portion, and the port hole is inclined with respect to the axis of the die holding case so as to approach the axis of the die holding case as it goes downstream. The metal material that flows through the port hole is smoothly guided to the shaft center in the die holding case, that is, the extrusion hole, and can be extruded in a stable state. Can be obtained.

  According to the metal material extrusion die of the invention [2], the metal material pressure-receiving surface is formed in a circumferential polyhedron in which a plurality of surfaces are arranged in the circumferential direction. Can be distributed in a well-balanced manner, and the strength against the metal material can be further improved. That is, when the metal material is pressed against the pressure-receiving surface formed in the circumferential polyhedron, a compressive force in the direction toward the axis of the pressure-receiving portion is applied to each part of the pressure-receiving surface, which occurs in the die holding case during extrusion molding. Shear force is further reduced. As a result, the shearing force generated in the hollow portion of the die holding case, which is the part where the shearing force is generated most in the die holding case, can be further reduced, so that the die is pressed against the pressing force of the metal material. The strength can be further improved.

  According to the metal material extrusion die of the invention [3], the metal material pressure-receiving surface is formed in an axial polyhedron in which a plurality of surfaces are arranged in the axial direction. Can be more reliably distributed in a balanced manner, and the strength against the metal material can be more reliably improved. That is, when the metal material is pressed against the pressure receiving surface formed in the axial polyhedron, a compressive force in the direction toward or near the center of the pressure receiving portion is applied to each part of the pressure receiving surface, so that the die is held during extrusion molding. The shear force generated in the case is more reliably reduced. As a result, the shearing force generated in the hollow portion of the die holding case, which is the part where the shearing force is most generated in the die holding case, can be more reliably reduced, and thus the pressing force of the metal material can be reduced. The strength of the die can be improved more reliably.

  According to the extrusion die for the metal material of the invention [4], the protruding height of the pressure receiving portion rearward is set to a predetermined magnification with respect to the radius of the circumscribed circle in the cross section at the outer peripheral edge position of the pressure receiving portion. Therefore, the pressing force of the metal material to the pressure-receiving surface can be more reliably distributed in a balanced manner, the strength against the metal material can be further improved, and the die life can be improved more reliably. it can.

  According to the extrusion die for the metal material of the invention [5], since the plurality of port holes are formed in the circumferential direction, the metal material can be uniformly introduced into the die holding case from the circumferential direction and smoothly into the extrusion hole. And can be extruded to a more stable state.

  According to the metal material extrusion die of the invention [6], since the port hole is arranged toward the extrusion hole, the metal material flowing into the port hole is supplied to the extrusion hole more smoothly. Can do.

  According to the metal material extrusion die of the invention [7], since the axial center of the port hole is set at a specific inclination angle, the metal material is supplied from the port hole to the extrusion hole in a more stable state. can do.

  According to the metal material extrusion die of the invention [8], since the annular base portion is provided integrally with the pressure receiving portion, it is reinforced by the annular base portion, and the strength of the die holding case and thus the entire extrusion die is increased. Can be further improved.

  According to the metal material extrusion die of the invention [9], since the metal material pressure-receiving surface is formed in a polygonal pyramid-shaped polyhedron, the pressing force of the metal material on the pressure-receiving surface can be further distributed in a balanced manner. Thus, the strength against the metal material can be further improved.

  According to the metal material extrusion die of the invention [10], an extruded product made of aluminum or aluminum alloy can be produced.

  According to the metal material extrusion die of the invention [11], a tube material having an annular cross section can be reliably formed.

  According to the metal material extrusion die of the invention [12], it is possible to reliably form a porous hollow material in which a plurality of passages are arranged in parallel in the width direction.

  According to invention [13], the manufacturing method of the extrusion molded product which show | plays the effect similar to the above can be provided.

  According to invention [14], the manufacturing method of the extruded tube material which has the same effect as the above can be provided.

  According to the invention [15], it is possible to provide a method for producing a porous hollow material having the same effects as described above.

  According to the invention [16], it is possible to provide a die holding case for an extrusion die that exhibits the same effect as described above.

  According to the invention [17], for the same reason as the above invention [4], the pressing force of the metal material to the pressure-receiving surface can be more reliably distributed in a balanced manner, and the strength against the metal material can be improved more reliably. Therefore, the die life can be improved more reliably.

  According to the invention [18], it is possible to provide a method for extruding a metal material having the same effects as described above.

  According to the invention [19], it is possible to provide a metal material extrusion molding machine having the same effects as described above.

  1 to 7 are views showing an extrusion die (10) as an example of the embodiment of the present invention. As shown in these drawings, the extrusion molding die (10) of this embodiment includes a die holding case (20), a male die (30), a female die (40), and a flow control plate (50). And. In the present embodiment, the “upstream side” in the extrusion direction is referred to as “rear side” and the “downstream side” is referred to as “front side” based on the extruded product formed by the die (10).

  The die holding case (20) has a hollow structure, and a pressure receiving portion (21) provided on the upstream side (rear side) and a downstream side (front side) with respect to the extrusion direction of the metal billet as the metal material. And a base portion (25) to be provided.

  In the pressure receiving portion (21), a surface (rear surface) facing the extrusion direction of the metal billet is formed on a billet pressure receiving surface (22) as a metal material pressure receiving surface. The billet pressure-receiving surface (22) is formed as a convex shape that protrudes in a direction (rear direction) opposite to the extrusion direction. The pressure-receiving surface (22) is formed as a convex polyhedron in a polygonal pyramid shape (specifically, a regular polygonal pyramid shape). As an example, 16 triangular flat surfaces (planes) are arranged side by side in the circumferential direction. Are formed in a hexagonal pyramid surface shape (specifically, a regular ten hexagonal pyramid surface shape).

  At the center of the peripheral wall of the pressure receiving portion (21), a male die holding hole (23) communicating with the internal hollow portion (weld chamber 12) is provided along the axis (A1). The male die holding hole (23) is formed in a circular shape corresponding to the cross-sectional shape of the male die (30). Further, as shown in FIGS. 2 and 4, the rear end side inner peripheral surface of the male die holding hole (23) is provided with an engaging step portion (23a) for engaging a male die (30) described later. It has been.

  A pair of port holes (24) and (24) are formed on both sides of the pressure receiving portion (21) on both sides of the axial center (A1). Each port hole (24) has a long hole shape extending along the circumferential direction, and is arranged at equal intervals in the circumferential direction. Further, the axis (A2) of the port hole (24) is the axis of the pressure receiving part (21) so that the port hole (24) approaches the axis (A1) of the pressure receiving part (21) as it goes downstream (front). It intersects and is inclined with respect to the heart (A1). The detailed configuration such as the inclination angle (θ) of the port hole (24) will be described in detail later.

  Needless to say, in the present embodiment, the axis of the die holding case (20) and the axis of the pressure receiving portion (21) are configured to coincide with each other.

  The base portion (25) is formed integrally with the pressure receiving portion (21), and is formed so that the outer peripheral surface protrudes outside the outer periphery of the other end side of the pressure receiving portion (21).

  A cylindrical female die holding hole (26) communicating with the internal weld chamber (12) and corresponding to the cross-sectional shape of the female die (40) is formed inside the base portion (25). . The axis of the female die holding hole (26) is configured to coincide with the axis (A1) of the die holding case (20).

  Further, as shown in FIGS. 2 and 4, etc., a female die (40), which will be described later, is engaged with the rear end side of the inner peripheral surface of the female die holding hole (26) via a flow control plate (50). An engagement step (26a) is formed.

  The front end of the male die (30) is configured as a mandrel (31). As shown in FIGS. 2 to 4, the mandrel (31) forms a hollow portion of a hollow material as an extruded product, and has a shape corresponding to the hollow portion shape of the hollow material, that is, a circular shape.

  On the outer peripheral edge portion of the rear end portion of the male die (30), an engaging convex portion corresponding to the engaging step portion (23a) of the male die holding hole (23) in the die holding case (20). (33a) is integrally formed in an outward projecting shape.

  The male die (30) is inserted into the male die holding hole (23) of the die holding case (20) from the billet pressure receiving surface (22) side and fixed. At this time, the engaging protrusion (33a) of the male die (30) is engaged with the engaging step portion (23a) in the male die holding hole (23), and the positioning of the male die (30) is performed. As a result, the mandrel (31) of the male die (30) is held in a state protruding a predetermined amount from the male die holding hole (23) inside the die holding case (20).

  The base end surface (rear end surface) of the male die (30) is formed on a part (tip portion) of a pyramidal surface following the billet pressure receiving surface (22) of the die holding case (20). 30), the base end face (rear end face) and the billet pressure receiving face (22) form a desired continuous polygonal pyramid shape.

  Here, in the present invention, as in the above embodiment, the base end surface (rear end surface) of the male die (30) is formed on a part of a pyramid surface that follows the billet pressure receiving surface (22). Although it is desirable that the base end surface of (30) and the billet pressure receiving surface (22) are formed in a desired continuous polygonal pyramid shape, in the present invention, the base end surface of the male die (30) The (rear end face) is not limited to being formed in this way, but may be formed as follows, for example. That is, in the present invention, when the surface area of the base end surface of the male die (30) is, for example, 1/3 or less of the surface area of the billet pressure receiving surface (22), the base end surface of the male die (30) is You may make it comprise by a part of outer peripheral surface of a cylinder. When the surface area of the base end face of the male die (30) is so small, the base end face of the male die (30) is formed not on a part of the pyramid surface but on a part of the outer peripheral surface of the cylinder. This is because the processing cost of the base end face of the male die (30) can be reduced while the influence on the die life and the extrusion load is small.

  The female die (40) has a cylindrical shape, and as shown in FIG. 3, key protrusions (47) (47) are formed on both sides of the outer peripheral surface in parallel with the axial center.

  The female die (40) has a die hole (bearing hole 41) that is open to the rear end surface side and formed corresponding to the mandrel (31) of the male die (30), and a die hole (41). A relief hole (42) that communicates and opens to the front end face side is provided.

  The die hole (41) is configured such that an inward protruding portion is provided along an inner peripheral edge portion thereof and an outer peripheral portion of the extruded product can be formed. Furthermore, the relief hole (42) is formed in a taper shape that widens toward the front end side (downstream side) so that the diameter dimension gradually increases, and is opened downstream.

  The flow control plate (50) has a circular outer shape corresponding to the cross-sectional shape of the female die holding hole (26) in the die holding case (20). Furthermore, a central through hole (51) is formed in the center of the flow control plate (50) corresponding to the mandrel (31) of the male die (30) and the die hole (41) of the female die (40). ing.

  As shown in FIG. 3, on both sides of the outer peripheral edge of the flow control plate (50), there are key protrusions (57) and (57) corresponding to the key protrusions (47) of the female die (40). Is formed.

  The female die (40) is accommodated and fixed in the female die holding hole (26) of the die holding case (20) via the flow control plate (50). At this time, the outer periphery of one end surface (rear end surface) of the female die (40) is engaged with the engaging step portion (26a) of the female die holding hole (26) via the outer peripheral edge portion of the flow control plate (50). Thus, the axial positioning of the female die (40) can be achieved.

  Further, the key protrusions (47) and (47) of the female die (40) and the keys of the flow control plate (50) are formed on both sides of the inner surface of the female die holding hole (26) in the die holding case (20). Corresponding to the protrusions (57) and (57), key grooves (not shown) parallel to the shaft center are provided, and key protrusions (47), (47), (57) and (57) are provided in the key grooves. Contained in conformity. The key projections (47) and (57) are engaged with the key grooves of the female die holding hole (26), thereby positioning the female die (40) and the flow control plate (50) in the direction around the axis. Is planned.

  By assembling the female die (40) and the flow control plate (50) in this way, the mandrel (31) of the male die (30) and the die hole (41) of the female die (40) become the flow control plate (50). ) In the central through hole (51). In this state, as shown in FIGS. 2 and 4, the mandrel (31) of the male die (30) is disposed inside the die hole (41) of the female die (40), and the mandrel (31) and An annular extrusion hole (11) is formed between the die holes (41).

  Here, in the present embodiment, a detailed configuration of the port hole (24) of the die holding case (20) will be described. First, the outflow side end portions (front end portions) of the pair of port holes (24) and (24) are arranged corresponding to the extrusion holes (11).

  As described above, the port holes (24) and (24) are set so that the axis (A2) thereof is inclined with respect to the axis (A1) of the die holding case (20). As shown in FIG. 4, in this embodiment, the inclination angle (θ) of the axis (A2) of the port hole (24) with respect to the axis (A1) of the die holding case (20) is set to 10 to 35 °. It is good to set it at 15 to 30 °. That is, when the inclination angle (θ) is set within the specific range, the metal material flows in a stable state through the port holes (24) and (24) and the weld chamber (12), and the metal material further flows. A high-quality extruded product (extruded product) having excellent dimensional accuracy can be formed by smoothly passing through the extrusion hole (11) in a well-balanced manner. In other words, when the inclination angle (θ) is too small, the metal material that has circulated through the port holes (24) and (24) and the weld chamber (12) is not smoothly introduced into the extrusion holes (11), It may be difficult to stably obtain a high-quality extruded product. On the contrary, when the inclination angle (θ) is too large, the material flow direction of the port hole (24) is largely inclined with respect to the material extrusion direction, which is not preferable because the extrusion load of the metal material becomes large.

  In the present embodiment, as shown in FIG. 4, the inner side surface (24a) and the outer side surface (24b) of the inner peripheral surface of the port hole (24) are arranged substantially parallel to each other, and the port hole (24). Are arranged substantially parallel to the axis (A2). Further, the inner side surface (24a) and the outer side surface (24b) of the inner peripheral surface of the port hole are respectively configured as inclined surfaces (tapered surfaces) that are inclined with respect to the axis (A1) of the die holding case (20).

  The extrusion die (10) having the above configuration is set in an extrusion molding machine as shown in FIGS. That is, the extrusion forming die (10) of this embodiment is set in the container (6) in a state of being attached to the die installation hole (5a) provided in the center of the plate (5). The extrusion die (10) is fixed to the direction orthogonal to the extrusion direction by the plate (5) and fixed to the extrusion direction by a backer (not shown).

  Then, a metal billet (metal material) such as an aluminum billet inserted into the container (6) is pushed in the right direction (extrusion direction) in FIG. 5 through the dummy block (7). Thereby, the metal billet is pressed against the billet pressure-receiving surface (22) of the die holding case (20) in the extrusion die (10) and plastically deforms. In this way, the metal material is plastically deformed, flows through the pair of port holes (24) and (24), is introduced into the weld chamber (12) of the die holding case (20), and further forwards through the extrusion hole (11). By being extruded, the metal material is formed into a cross-sectional shape corresponding to the opening shape of the extrusion hole (11), and a metal extrusion-molded product (circular tube material) is manufactured.

  According to the extrusion molding die (10) of the present embodiment, the billet pressure receiving surface (22) is formed in a regular polygonal pyramid shape (that is, a circumferential regular polyhedron), so that the metal billet is a billet pressure receiving surface (22). When pressed, the pressing force can be received in a balanced manner by each surface of the polygonal pyramid surface. Therefore, the pressing force in the normal direction at each portion of the billet pressure receiving surface (22) can be further reduced, the strength against the pressing force of the metal material can be further improved, and sufficient durability can be obtained. That is, when the metal material is pressed against the pressure receiving surface formed in the shape of a regular polygonal pyramid, a compressive force in the direction toward the axis of the pressure receiving portion is applied to each part of the pressure receiving surface. Is further reduced. As a result, the shearing force generated in the hollow portion of the die holding case (20), which is the portion where the shearing force is generated most in the die holding case (20), can be further reduced, and thus the metal material. The strength of the die against the pressing force can be further improved.

  Here, in this embodiment, with respect to the radius (r) of the circumscribed circle (C) in the cross section at the outer peripheral edge position of the pressure receiving portion (21), the protruding height (h) of the pressure receiving portion (21) to the rear is set. It is good to set 0.3 to 1.5 times, especially 0.6 to 1.2 times (see FIGS. 3 and 4). By doing so, the pressing force of the billet to the pressure receiving surface (22) can be more reliably distributed in a well-balanced manner, and the strength against the billet can be more reliably improved, thereby further improving the die life. be able to.

  Furthermore, in this embodiment, the port hole (24) for material inflow is formed in the pressure receiving part (21) of the die holding case (20) that covers the male die (30) and the female die (40). In other words, since the front end wall portion of the pressure receiving portion (21) and the wall portion of the base portion (25) are continuously formed in the circumferential direction, the die holding case (20 ) And the strength of the entire extrusion die can be further improved. Therefore, there is no weak portion such as a conventional bridge portion, and it is not necessary to form a size such as a wall thickness larger than necessary for strength improvement, so that it can be reduced in size and weight, Cost can also be reduced.

  For reference, according to the experimental results related to the die life by the inventor, the die life of the extrusion molding die of the present invention was able to be extended by about three times compared to the conventional product.

  Moreover, in this invention, since it has sufficient pressure | voltage resistance (strength), an extrusion limit speed | velocity | rate can be improved considerably. For example, in the conventional extrusion die, the upper limit of the extrusion speed was 20 m / min, whereas in the extrusion die of the present invention, the upper limit of the extrusion speed can be increased to 50 m / min, The extrusion limit speed can be increased by about 2.5 times, and further improvement in production efficiency can be expected.

  In the present embodiment, the port holes (24) and (24) are formed at positions deviating from the axis (A1) of the pressure receiving portion (21), that is, the outer periphery, and the shafts of the port holes (24) and (24) are formed. Since the core (A2) is inclined with respect to the axis (A1) of the die holding case (20) so as to gradually approach the axis of the die holding case (20) as it goes downstream, the port hole (24) The metal material flowing through (24) is smoothly guided to the axis (A1) of the die holding case (20), that is, the extrusion hole (11), and can be extruded in a stable state. Furthermore, in this embodiment, since the downstream end (exit) of the port holes (24) and (24) is arranged toward the extrusion hole (11), the metal material can be more smoothly formed into the extrusion hole (11). Can lead.

  In addition, the billet pressure receiving surface (22) of the extrusion die (10) in the present embodiment is usually manufactured using wire-cut electric discharge machining or the like, but in this embodiment, the billet pressure receiving surface (22) is Since the billet pressure-receiving surface (22) is manufactured by wire-cut electric discharge machining, each surface can be machined by flat finishing, for example, billet pressure-receiving surface Compared with the case of forming on a curved surface such as a convex spherical surface, the workability can be remarkably improved, and the die can be manufactured easily.

  However, in the present invention, each surface constituting the billet pressure-receiving surface (22) is not necessarily configured by a flat surface, and may be configured by a curved surface. You may make it comprise by combining.

  In the extrusion die (10) of the above-described embodiment, the pressure receiving portion (21) is described as an example including a hexagonal pyramid-shaped die holding case (20). However, for the extrusion molding of the present invention. In the die, the shape of the pressure receiving portion (21) is not limited to that.

  More specifically, the pressure receiving portion (21) of the die holding case (20) is other than the above embodiment, for example, as shown in FIG. 8, the pressure receiving portion (21) has three pressure receiving surfaces (22). As shown in FIG. 9, the pressure receiving part (21) has four triangular shapes on the pressure receiving surface (22), which are configured by triangular pyramids in which triangular flat surfaces are arranged side by side in the circumferential direction. Are formed by a quadrangular pyramid shape arranged side by side in the circumferential direction. Furthermore, as shown in FIG. 10, the pressure receiving portion (21) has eight triangular shapes on the pressure receiving surface (22). A polygonal pyramid shape, such as an octagonal pyramid shape in which flat surfaces are arranged side by side in the circumferential direction, can be employed.

  Furthermore, in the said embodiment, although the top part (rear end) of the pressure receiving part (21) is formed in the tapered sharp shape, it is not restricted to it, In this invention, as shown, for example in FIG. 21), it is also possible to adopt a configuration in which the top of the head is formed in a polygonal frustum shape such as a dodecagonal frustum shape formed on a flat surface orthogonal to the axial direction.

  Further, the pressure receiving part (21) is not limited to the circumferential polyhedron in which a plurality of surfaces are arranged in the circumferential direction like the above-mentioned polygonal pyramid or polygonal frustum shape, and there are a plurality of pressure receiving parts (21) in the axial direction (radial direction). An axial polyhedron in which the surfaces are arranged side by side can also be employed. For example, as shown in FIG. 12, as the pressure receiving portion (21), a pressure receiving surface (22) formed by five annular flat surfaces arranged side by side in the axial direction can be adopted. These five annular flat surfaces have a gradual decrease in diameter and a gradual inclination angle toward the top of the head. Needless to say, the number of axial divisions (number of faces) in the pressure receiving portion (21) is not limited to five, and may be divided into 1 to 4 or 6 or more.

  According to the extrusion die (10) having the pressure receiving portion (21) shown in FIG. 12, the billet pressure receiving surface (22) is formed into an axial polyhedron in which a plurality of surfaces are arranged in the axial direction. Therefore, the pressing force of the billet to the pressure receiving surface (22) can be more reliably distributed with good balance, and the strength against the billet can be improved more reliably. That is, when the billet is pressed against the pressure receiving surface (22) formed in the axial polyhedron, the compressive force in the direction toward or near the center of the pressure receiving portion (21) is applied to each part of the pressure receiving surface (22). Therefore, the shearing force generated in the die holding case (20) during extrusion molding is more reliably reduced. As a result, the shear force generated in the hollow portion of the die holding case (22), which is the portion where the largest shearing force is generated in the die holding case (20), can be more reliably reduced. The strength of the die against the pressing force of the billet can be improved more reliably.

  Furthermore, in the present invention, a polyhedral shape in which a circumferential polyhedron and an axial polyhedron are used in combination can also be adopted as the pressure receiving portion. For example, as shown in FIG. 13, as the pressure receiving portion (21), the pressure receiving surface (22) is arranged side by side in the axial direction, and has five polygonal annular flat shapes whose diameter dimension gradually decreases toward the top of the head. What was formed by the surface can also be employ | adopted. As these five polygonal annular flat surfaces move toward the top of the head, the diameter dimension gradually decreases and the inclination angle also gradually decreases. Of course, even when the circumferential polyhedron and the axial polyhedron are used together, the number of divisions in the circumferential direction and the number of divisions in the axial direction are not limited to the above.

  In the present invention, each surface constituting the pressure receiving portion (21) is not necessarily formed by a flat surface, and may be formed by a curved surface such as an arcuate convex surface or a concave surface.

  Furthermore, the pressure receiving part (21) of the present invention may be a polyhedron formed of a large number of faces, and may be a polyhedron formed by a combination of flat and curved surfaces.

  In the above embodiment, the case where two port holes (24) are provided has been described as an example. However, the present invention is not limited to this. In the present invention, three or more port holes (24) may be provided. . In particular, as shown in FIG. 8, in the case of the triangular pyramid-shaped pressure receiving portion (21), a total of three port holes (one on each surface) are arranged so that the port holes (24) can be evenly arranged in the circumferential direction. 24) may be provided. Furthermore, for the same reason, in the case of the quadrangular pyramid shape shown in FIG. 9, a total of four port holes (24) may be provided.

  Furthermore, in the said embodiment, although demonstrated taking the case where the base part (25) was provided in the front-end part in the die | dye holding | maintenance case (20), it is not restricted only to it, As shown in FIG. The base portion (25) is not provided at the front end portion of the die holding case (20), or the outer peripheral surface of the base portion (25) in the die holding case (20) does not protrude outward as shown in FIG. Also, it is possible to employ one formed substantially flush with the outer peripheral surface of the front end of the pressure receiving portion (21).

  Moreover, in the said embodiment, although demonstrated taking the case where the one die | dye for extrusion molding (10) was set to the container (6) as an example, it is not restricted only to it, In the extrusion molding machine of this invention, a container (6 ), Two or more extrusion dies (10) may be set.

  In the above embodiment, the case of extruding a round tube has been described as an example. However, the present invention is not limited thereto, and in the present invention, a flat tube may be extruded. For example, as shown in FIGS. 16 and 17, a hollow porous tube (heat exchange tube) (60) can be extrusion-molded as a porous hollow material often used in a heat exchanger such as a condenser for a car air conditioner. The hollow portion (61) of the tube (60) extends in the tube length direction and is partitioned into a plurality of heat exchange passages (63) by a plurality of partition walls (62) arranged in parallel to each other. .

  In order to form such a flat porous tube (60), a male die (30) and a female die (40) as shown in FIG. 18 are used. That is, the female die (40) has a die hole (41) formed in a long hole shape corresponding to the shape of the outer peripheral portion of the flat porous tube (60). The male die (30) has a mandrel (31) having a tip (front end) formed corresponding to the hollow portion of the tube (60). Further, the tip of the mandrel (31) is formed in a comb-like shape having a plurality of passage forming projections (33) corresponding to the passages (63) of the tube (60). And the clearance gap provided between each of these channel | path formation convex parts (33) is comprised as the groove | channel for groove | channel formation (32) for forming the partition of a tube (60).

  When the flat tube (60) is formed with such a die, the pressure receiving portion (22) in the die holding case (20) so that the extruded material is introduced from both sides in the thickness (height) direction of the tube. Moreover, it is preferable to form two port holes (24) corresponding to both sides in the tube thickness direction.

<Example 1>
As shown in Table 1, an extrusion die (10) similar to the modification shown in FIG. 8 was prepared. The die holding case (20) of the die (10) has a circumferential number of “3” and an axial number of “1”, that is, three triangular flat surfaces are arranged side by side in the circumferential direction. In addition, the top (rear end) of the head has a pressure receiving portion (21) having a sharp triangular pyramid shape (in detail, a regular triangular pyramid shape). Further, the pressure receiving portion (21) has a radius (radius perpendicular to the extrusion direction) adjusted to 30 mm and a height (length in the extrusion direction) adjusted to 30 mm.

  More specifically, the radius of the pressure receiving portion (21) is the radius (r) of the circumscribed circle in the cross section at the outer peripheral edge position of the pressure receiving portion (21), and the height of the pressure receiving portion (21) is It is the protrusion height (h) to the back of a pressure receiving part (21). The same applies hereinafter.

  Each of the three flat surfaces of the pressure receiving portion (21) is formed with a port hole (24), and the axis (A1) of the pressure receiving portion (21) in the axis (A2) of each port hole (24). The inclination angle (θ) with respect to is adjusted to 10 °.

  The male die (30) is formed in a perfect circle shape with an outer diameter of 3.0 mm, and the die hole (41) of the female die (40) is formed in a perfect circle shape with an inner diameter of 4.0 mm. Has been.

  As shown in FIGS. 5 to 7, the extrusion molding die (10) was set in an extrusion molding machine similar to the above embodiment, and extrusion molding was performed to manufacture a cylindrical pipe.

  Then, the die life (the amount of material introduced (ton) until cracking and wear occurred on the die) was measured, and the factors limiting the die life were further investigated. The results are shown in Table 1.

  For reference, Table 1 also shows the production cost (1,000 yen) of the die holding case and the non-defective rate (%) of the die holding case in each example.

<Example 2>
As shown in Table 1, an extrusion die (10) similar to the modification shown in FIG. 9 was prepared. The die holding case (20) of the die (10) has a circumferential number of “4” and an axial number of “1”, that is, four triangular flat surfaces are arranged side by side in the circumferential direction. The pressure receiving portion (21) has a quadrangular pyramid shape (a regular quadrangular pyramid shape in detail). Furthermore, port holes (24) are formed in the four flat surfaces of the pressure receiving portion (21), respectively.

  In other configurations, the same molding die (10) as in Example 1 was set in an extrusion molding machine in the same manner as described above to produce an extruded product, and the same evaluation as above was performed.

<Example 3>
As shown in Table 1, an extrusion die (10) similar to the modification shown in FIG. 10 was prepared. The die holding case (20) of the die (10) has a circumferential number of “8” and an axial number of “1”, that is, eight triangular flat surfaces are arranged side by side in the circumferential direction. The pressure receiving portion (21) has an octagonal pyramid shape (a regular octagonal pyramid shape in detail). Furthermore, two port holes (24) are formed in the pressure receiving part (21).

  For other configurations, the same molding die (10) as in the above example was set in an extrusion molding machine in the same manner as described above to produce an extruded product, and the same evaluation as above was performed.

<Example 4>
As shown in Table 1, an extrusion die (10) similar to the embodiment shown in FIGS. The die holding case (20) of the die (10) has a circumferential number of “16” and an axial number of “1”, that is, sixteen triangular flat surfaces are arranged side by side in the circumferential direction. It has the pressure receiving part (21) of the dodecagonal hexagon shape (it is a regular dodecagonal hexagonal shape when it explains in detail). Furthermore, two port holes (24) are formed in the pressure receiving part (21).

  For other configurations, the same molding die (10) as in the above example was set in an extrusion molding machine in the same manner as described above to produce an extruded product, and the same evaluation as above was performed.

<Example 5>
As shown in Table 1, an extrusion die (10) similar to the modification shown in FIG. 11 was prepared. The pressure receiving part (21) in the die holding case (20) of the die (10) is positioned at a distance of 2 mm forward from the top (rear end) compared to the pressure receiving part (21) of the fourth embodiment. Thus, it is different in that the top of the head is formed on a flat surface by cutting at right angles to the axial direction.

  That is, in the pressure receiving portion (21) of the fifth embodiment, the number of circumferential surfaces is “16” and the number of axial surfaces is “1”, that is, 16 trapezoidal flat surfaces are arranged side by side in the circumferential direction. In addition, the pressure receiving portion (21) has a hexagonal frustum shape (specifically, a regular ten hexagonal frustum shape). Furthermore, two port holes (24) are formed in the pressure receiving part (21).

  For other configurations, the same molding die (10) as in the above example was set in an extrusion molding machine in the same manner as described above to produce an extruded product, and the same evaluation as above was performed.

<Example 6>
As shown in Table 1, an extrusion die (10) similar to the modification shown in FIG. 12 was prepared. The die holding case (20) of the die (10) has a circumferential number of “1” and an axial number of “5”, that is, the pressure receiving surface (22) is arranged in the axial direction. It is constituted by five annular flat surfaces (annular surface connecting type). Furthermore, the pressure receiving part (21) has two port holes (24), and the top of the head is formed on a flat surface.

  For other configurations, the same molding die (10) as in the above example was set in an extrusion molding machine in the same manner as described above to produce an extruded product, and the same evaluation as above was performed.

<Example 7>
As shown in Table 1, an extrusion die (10) similar to the modification shown in FIG. 13 was prepared. The die holding case (20) of the die (10) has a circumferential surface number of “16” and an axial surface number of “5”, that is, the pressure receiving surface (22) is arranged in the axial direction. It is constituted by five polygonal annular surfaces (polygonal annular surface connection type). Furthermore, the pressure receiving part (21) has two port holes (24), and the top of the head is formed in a flat surface shape.

  For other configurations, the same molding die (10) as in the above example was set in an extrusion molding machine in the same manner as described above to produce an extruded product, and the same evaluation as above was performed.

<Reference example>
As shown in Table 1, in this extrusion die, the pressure receiving surface (22) of the pressure receiving portion (21) is formed on the outer surface (convex spherical surface) of a half sphere having a radius of 30 mm. Furthermore, two port holes are formed in the pressure receiving portion (21).

  For other configurations, the same molding die as in the above example was set in an extrusion molding machine in the same manner as described above to produce an extruded product, and the same evaluation as above was performed.

<Comparative example>
As shown in Table 1, a bridge-type die for extrusion molding was prepared, in which the radius was 30 mm, the height (length in the extrusion direction) was 30 mm, and the pressure-receiving surface was finished to a flat surface orthogonal to the extrusion direction. The inclination angle (θ) with respect to the axis in the metal material introduction direction is substantially 0 °.
Other configurations are the same as those in the above embodiment.

  The molding die was set in an extrusion molding machine in the same manner as described above to produce an extruded product, and the same evaluation as described above was performed.

<Evaluation>
As shown in Table 1, it can be seen that in Examples 1 to 7 and the reference example, the die life is long and good durability is provided as compared with the comparative example.

  Further, in the comparative example, the crack is a life factor of the male die, and there is a possibility that it is difficult to take a countermeasure for the life in advance.

  On the other hand, in the examples and the reference examples, since wear is a life factor of the male die, it is possible to relatively easily take a countermeasure for the life in advance.

  Further, in the examples, no significant differences were found in terms of production cost and non-defective product rate compared to the comparative examples, but the production costs were lower than those of the reference examples. Moreover, the yield rate is high and it can be seen that it is excellent in productivity.

  Especially the thing of Examples 1-5 was excellent in both production cost and the yield rate, and the thing of Examples 1-3 was able to reduce the production cost significantly.

  There was no significant numerical difference between the flat top and the sharp one depending on the evaluation test this time, but the flat top has a die assembly workability such as inserting a male die. It was excellent.

<Example 8>
As shown in Table 2, an extrusion die (10) similar to the embodiment shown in FIGS. The die holding case (20) of the die (10) has a circumferential number of “16” and an axial number of “1”, that is, sixteen triangular flat surfaces are arranged side by side in the circumferential direction. And a pressure receiving portion (21) having a sharp hexagonal pyramid shape (specifically, a regular ten hexagonal pyramid shape) having a sharp top. Further, the pressure receiving portion (21) has a radius (r) adjusted to 30 mm and a height (h) adjusted to 6 mm. Therefore, h / r = 0.2.

  In addition, two port holes (24) are formed in the pressure receiving part (21), and an inclination angle (with respect to the axis (A1) of the pressure receiving part (21) in the axis (A2) of each port hole (24) ( θ) is adjusted to 10 °.

  The male die (30) is formed in a perfect circle shape with an outer diameter of 3.0 mm, and the die hole (41) of the female die (40) is formed in a perfect circle shape with an inner diameter of 4.0 mm. Has been.

  As shown in FIGS. 5 to 7, the extrusion molding die (10) was set in an extrusion molding machine similar to the above embodiment, and extrusion molding was performed to manufacture a cylindrical pipe.

  Then, the die life was measured and the limiting factors of the die life were investigated. The results are shown in Table 2.

<Example 9>
An extrusion die (10) having a pressure receiving portion (21) with a radius (r) adjusted to 30 mm and a height (h) adjusted to 9 mm was prepared. Therefore, this pressure receiving part (21) is h / r = 0.3. The other structure of this extrusion die (10) is the same as that of Example 8.

  Then, this extrusion molding die (10) was set in an extrusion molding machine similar to that in Example 8, and extrusion molding was performed in the same manner to produce a cylindrical pipe, and evaluation similar to that in Example 8 was performed. .

<Example 10>
An extrusion die (10) having a pressure receiving portion (21) having a radius (r) adjusted to 30 mm and a height (h) adjusted to 18 mm was prepared. Therefore, this pressure receiving part (21) is h / r = 0.6. The other structure of this extrusion die (10) is the same as that of Example 8.

  Then, this extrusion molding die (10) was set in an extrusion molding machine similar to that in Example 8, and extrusion molding was performed in the same manner to produce a cylindrical pipe, and evaluation similar to that in Example 8 was performed. .

<Example 11>
An extrusion die (10) having a pressure receiving part (21) with a radius (r) adjusted to 30 mm and a height (h) adjusted to 30 mm was prepared. Therefore, this pressure receiving part (21) is h / r = 1.0. The other structure of this extrusion die (10) is the same as that of Example 8.

  Then, this extrusion molding die (10) was set in an extrusion molding machine similar to that in Example 8, and extrusion molding was performed in the same manner to produce a cylindrical pipe, and evaluation similar to that in Example 8 was performed. .

<Example 12>
An extrusion die (10) having a pressure receiving portion (21) having a radius (r) adjusted to 30 mm and a height (h) adjusted to 36 mm was prepared. Therefore, this pressure receiving part (21) is h / r = 1.2. The other structure of this extrusion die (10) is the same as that of Example 8.

  Then, this extrusion molding die (10) was set in an extrusion molding machine similar to that in Example 8, and extrusion molding was performed in the same manner to produce a cylindrical pipe, and evaluation similar to that in Example 8 was performed. .

<Example 13>
An extrusion die (10) having a pressure receiving portion (21) having a radius (r) adjusted to 30 mm and a height (h) adjusted to 45 mm was prepared. Therefore, this pressure receiving part (21) is h / r = 1.5. The other structure of this extrusion die (10) is the same as that of Example 8.

  Then, this extrusion molding die (10) was set in an extrusion molding machine similar to that in Example 8, and extrusion molding was performed in the same manner to produce a cylindrical pipe, and evaluation similar to that in Example 8 was performed. .

<Example 14>
An extrusion die (10) having a pressure receiving portion (21) adjusted to a radius (r) of 30 mm and a height (h) of 54 mm was prepared. Therefore, this pressure receiving part (21) is h / r = 1.8. The other structure of this extrusion die (10) is the same as that of Example 8.

  Then, this extrusion molding die (10) was set in an extrusion molding machine similar to that in Example 8, and extrusion molding was performed in the same manner to produce a cylindrical pipe, and evaluation similar to that in Example 8 was performed. .

<Evaluation>
As shown in Table 2, the dies of Examples 9 to 13 had a long die life among the dies of Examples 8 to 14. Among these, the dies of Examples 10 to 12 had a long die life.

  Further, among the dies of Examples 8 to 14, the die of Example 8 has a relatively short die life because the strength of the die holding case (20) is relatively low, so that the die is held during extrusion molding. Since the case (20) is deformed and the position of the mandrel (31) of the male die (30) is moved forward (downstream) from the position of the die hole (41) of the female die (40), the male die It seems that the die life was shortened as a result of the slightly faster wear rate of the die (30).

  Moreover, according to the dies of Examples 8 to 14, the larger the value of h / r, the longer the port hole (24) provided in the pressure receiving portion (21) in the extrusion direction, and as a result, extrusion molding. The shear resistance at the time increases, and the wear of the male die (30) easily proceeds. For this reason, the die of Example 14 had a relatively short die life among the dies of Examples 9 to 14, and the die of Example 13 had the shortest die life after that of Example 14.

  From the above results, it was confirmed that the value of h / r is preferably in the range of 0.3 to 1.5, and particularly preferably in the range of 0.6 to 1.2.

  The metal material extrusion die of the present invention can be applied when an extruded product such as a hollow tube is manufactured by extruding a metal material.

It is a perspective view which shows the die for extrusion molding which is an example of embodiment of this invention. It is a perspective view which cuts and shows the die for extrusion molding of one embodiment. It is a perspective view which decomposes | disassembles and shows the die for extrusion molding of one embodiment. It is a one side sectional view showing the die for extrusion molding of one embodiment. It is a perspective view which cuts and shows the principal part of the extrusion molding machine with which the die | dye for extrusion molding of one Embodiment was applied. It is a 1 side sectional view showing the die periphery in the extrusion molding machine of one embodiment. It is other side sectional drawing which shows the die periphery in the extrusion molding machine of one embodiment. It is a perspective view which shows the die for extrusion molding which is a 1st modification of this invention. It is a perspective view which shows the die for extrusion molding which is a 2nd modification of this invention. It is a perspective view which shows the die for extrusion molding which is the 3rd modification of this invention. It is a perspective view which shows the die for extrusion molding which is the 4th modification of this invention. It is a perspective view which shows the die for extrusion molding which is the 5th modification of this invention. It is a perspective view which shows the die for extrusion molding which is the 6th modification of this invention. It is a perspective view which shows the die for extrusion molding which is the 7th modification of this invention. It is a perspective view which shows the die for extrusion molding which is the 8th modification of this invention. It is a perspective view which shows the porous hollow material which can be extrusion-molded with the die | dye for extrusion molding of an example of this invention. It is front sectional drawing which shows the porous hollow material which can be extruded with the die for extrusion molding of an example of this invention. It is a perspective view which expands and shows the inside of an example die for extrusion molding which can extrude a porous hollow material in this invention. It is a perspective view which shows the conventional die for extrusion molding, Comprising: The figure (a) is a perspective view which decomposes | disassembles a porthole die, The figure (b) is a perspective view which decomposes | disassembles a spider die, FIG. c) is a perspective view showing a bridge die.

Explanation of symbols

6 ... Container 10 ... Extrusion die 11 ... Extrusion hole 20 ... Die holding case 21 ... Pressure receiving part 22 ... Billet pressure receiving surface (metal material pressure receiving surface)
24 ... Port hole 25 ... Base part 30 ... Male die 31 ... Mandrel 33 ... Projection part 40 for passage formation ... Female die 41 ... Die hole 60 ... Hollow material 63 ... Passage A1 ... Shaft of die holding case (pressure receiving part) Center A2: Port hole axis θ: Inclination angle C: circumscribed circle

Claims (19)

A die holding case that has a pressure receiving portion whose outer surface is a metal material pressure receiving surface, and is arranged facing rearward so that the metal material pressure receiving surface of the pressure receiving portion faces the extrusion direction of the metal material;
A male die having a mandrel that is held inside the die holding case and is arranged corresponding to the axis of the die holding case;
A female die that is held at the front in the die holding case and provided with a die hole that forms an extrusion hole with the mandrel, and
While the metal material pressure-receiving surface in the pressure-receiving portion is formed in a convex shape protruding backward, the metal material pressure-receiving surface is constituted by a polyhedron,
A port hole for introducing a metal material is provided on the outer periphery of the pressure receiving part, and is inclined with respect to the axis of the die holding case so that the axis of the port hole approaches the axis of the die holding case as it goes downstream. Arranged to
A metal material extrusion die, wherein the metal material pressed against the metal material pressure-receiving surface is guided through the port hole into the die holding case and passes through the extrusion hole.   2. The metal material extrusion die according to claim 1, wherein the metal material pressure-receiving surface is formed in a circumferential polyhedron in which a plurality of surfaces are arranged in the circumferential direction.   3. The metal material extrusion die according to claim 1, wherein the metal material pressure-receiving surface is formed in an axial polyhedron in which a plurality of surfaces are arranged in the axial direction.   The height of the rearward protrusion of the pressure receiving portion is set to 0.3 to 1.5 times the radius of the circumscribed circle in the cross section at the outer peripheral edge position of the pressure receiving portion. A die for extrusion molding of a metal material according to any one of the above.   The die for extrusion molding of a metal material according to any one of claims 1 to 4, wherein a plurality of port holes are formed at equal intervals in the circumferential direction around the axis of the die holding case.   The die for extrusion molding of a metal material according to any one of claims 1 to 5, wherein the port hole is arranged toward the extrusion hole.   7. The metal material extrusion molding according to claim 1, wherein the axis of the port hole is set at an inclination angle of 10 to 35 ° with respect to the axis of the die holding case. dice.   The die for extrusion molding of a metal material according to any one of claims 1 to 7, wherein an annular base portion is provided integrally with the pressure receiving portion at a front portion of the die holding case.   The die for extrusion molding of a metal material according to any one of claims 1 to 8, wherein the pressure receiving portion is formed in a polygonal pyramid shape.   The metal material extrusion die according to any one of claims 1 to 9, wherein the metal material is made of aluminum or an alloy thereof. An annular extrusion hole is formed between the mandrel of the male die and the die hole of the female die,
The die for extrusion molding of a metal material according to any one of claims 1 to 10, wherein a tube material having an annular cross section is formed by passing the metal material through the extrusion hole. . Between the mandrel of the male die and the die hole of the female die, a flat annular extrusion hole whose height (thickness) is smaller than the width is formed,
The portion corresponding to the die hole in the mandrel is formed in a comb-like shape having a plurality of projections for forming a passage arranged side by side in the width direction,
11. The structure according to claim 1, wherein a porous hollow material in which a plurality of passages are arranged in the width direction is formed by passing the metal material through the extrusion hole. Dies for metal material extrusion.   The manufacturing method of the extrusion molded product which shape | molds an extrusion molded product using the die | dye for extrusion molding described in any one of Claims 1-10.   The manufacturing method of the extrusion tube material which shape | molds an extrusion tube material using the die for extrusion molding described in Claim 11.   The manufacturing method of the porous hollow material which shape | molds a porous hollow material using the die | dye for extrusion molding described in Claim 12. It has a pressure receiving portion whose outer surface is a metal material pressure receiving surface, and is disposed rearward so that the metal material pressure receiving surface of the pressure receiving portion faces the extrusion direction of the metal material, while a male die and a female inside A die holding case for an extrusion die in which a die is held,
While the metal material pressure-receiving surface in the pressure-receiving portion is formed in a convex shape protruding backward, the metal material pressure-receiving surface is constituted by a polyhedron,
A port hole for introducing a metal material is provided on the outer periphery of the pressure receiving part, and is inclined with respect to the axis of the die holding case so that the axis of the port hole approaches the axis of the die holding case as it goes downstream. Arranged to
Extrusion characterized in that the metal material pressed against the metal material pressure receiving surface is guided into the die holding case through the port hole and passes through the extrusion hole between the male die and the female die. Die holding case for forming dies.   The height of the rearward protrusion of the pressure receiving portion is set to 0.3 to 1.5 times the radius of the circumscribed circle in the cross section at the outer peripheral edge position of the pressure receiving portion. Die holding case for dies for extrusion molding. A method for extruding a metal material,
A die holding case that has a pressure receiving portion whose outer surface is a metal material pressure receiving surface, and is arranged facing rearward so that the metal material pressure receiving surface of the pressure receiving portion faces the extrusion direction of the metal material;
A male die having a mandrel that is held inside the die holding case and is arranged corresponding to the axis of the die holding case;
A female die that is held at the front portion in the die holding case and provided with a die hole that forms an extrusion hole with the mandrel; and
While forming the metal material pressure receiving surface in the pressure receiving portion into a convex shape protruding backward, the metal material pressure receiving surface is constituted by a polyhedron,
A port hole for introducing a metal material is provided on the outer periphery of the pressure receiving portion, and the port hole is inclined with respect to the axis of the die holding case so as to approach the axis of the die holding case as it goes downstream. So that
A method for extruding a metal material, characterized in that a metal material pressed against a metal material pressure-receiving surface is guided through a port hole into a die holding case and passed through an extrusion hole. A metal material extrusion machine comprising a container and an extrusion die set in the container, wherein the metal material in the container is supplied to the extrusion die,
The extrusion die is
A die holding case that has a pressure receiving portion whose outer surface is a metal material pressure receiving surface, and is arranged facing rearward so that the metal material pressure receiving surface of the pressure receiving portion faces the extrusion direction of the metal material;
A male die having a mandrel that is held inside the die holding case and is arranged corresponding to the axis of the die holding case;
A female die that is held at the front in the die holding case and provided with a die hole that forms an extrusion hole with the mandrel, and
While the metal material pressure-receiving surface in the pressure-receiving portion is formed in a convex shape protruding backward, the metal material pressure-receiving surface is constituted by a polyhedron,
A port hole for introducing a metal material is provided on the outer periphery of the pressure receiving part, and is inclined with respect to the axis of the die holding case so that the axis of the port hole approaches the axis of the die holding case as it goes downstream. Arranged to
A metal material extrusion molding machine characterized in that a metal material pressed against a metal material pressure receiving surface is guided into a die holding case through a port hole and passes through an extrusion hole.

Images