EP2049277A1 - Filière d'extrusion de matériau métallique - Google Patents

Filière d'extrusion de matériau métallique

Info

Publication number
EP2049277A1
EP2049277A1 EP07829274A EP07829274A EP2049277A1 EP 2049277 A1 EP2049277 A1 EP 2049277A1 EP 07829274 A EP07829274 A EP 07829274A EP 07829274 A EP07829274 A EP 07829274A EP 2049277 A1 EP2049277 A1 EP 2049277A1
Authority
EP
European Patent Office
Prior art keywords
die
extrusion
pressure receiving
metallic material
porthole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07829274A
Other languages
German (de)
English (en)
Other versions
EP2049277A4 (fr
Inventor
Kimihisa Hiramoto
Hidekazu Sakihama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Resonac Holdings Corp
Original Assignee
Showa Denko KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2007057124A external-priority patent/JP5053664B2/ja
Priority claimed from JP2007056953A external-priority patent/JP5053663B2/ja
Application filed by Showa Denko KK filed Critical Showa Denko KK
Publication of EP2049277A1 publication Critical patent/EP2049277A1/fr
Publication of EP2049277A4 publication Critical patent/EP2049277A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C25/00—Profiling tools for metal extruding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, bars, tubes
    • B21C23/10—Making finned tubes

Definitions

  • the present invention relates to an extrusion die for a metallic material used for extruding a metallic material and its related art.
  • an extrusion die used for manufacturing a metallic hollow extruded product such as , e.g., an aluminum heat exchanging tube
  • a porthole die as shown in Fig. 44A
  • a spider die as shown in Fig.
  • a male die 1 and a female die 2 are
  • the extrusion die is configured such that a metallic billet (metallic material) pressed against the billet pressure
  • an extrusion die for a metallic material as disclosed by the below-listed Patent Documents 1 and 2 has been conventionally proposed.
  • the billet pressure receiving surface of the male die is formed into a convex shape protruded in a direction opposite to the billet extruding direction (i.e. , protruded rearward) so that the pressing force of the metallic billet to be applied to the billet pressure receiving surface can be received by a bridge portion of the male die.
  • Patent Document 1 Japanese UnexaminedLaid-openUtilityModel Publication No. S53-102938 (see claims. Figs. 3-5)
  • Patent Document 2 Japanese Examined Laid-open Patent Publication No. H06-81644 (see claims, drawings)
  • the preferred embodiments of the present invention have been developed in view of the above-mentioned and/or other problems in the related art .
  • the preferred embodiments of the present invention can significantly improve upon existing methods and/or apparatuses .
  • the present invention was made to solve the aforementioned problems of conventional techniques , and aims to provide an extrusion die for a metallic material capable of obtaining a high quality extruded article while reducing the cost and size of the die and securing sufficient strength and durability of the die.
  • Thepresent invention also aims toprovide relatedtechnologies capable of attaining the aforementioned objects, such as, e.g., a production method of an extruded article, a production method of an extruded tubular member, a production method of amulti-passage hollow member, a die case for an extrusion die, an extrusion method of a metallic material, and an extruder for a metallic material.
  • relatedtechnologies capable of attaining the aforementioned objects, such as, e.g., a production method of an extruded article, a production method of an extruded tubular member, a production method of amulti-passage hollow member, a die case for an extrusion die, an extrusion method of a metallic material, and an extruder for a metallic material.
  • the present invention provides the following means to attain the aforementioned objects.
  • An extrusion die for a metallic material comprising: a die case having a pressure receiving portion with an outer surface functioning as a metallic material pressure receiving surface, the die case being disposed with the metallic material pressure receiving surface faced rearward against an extrusion direction of the metallic material; a male die disposed in the die case; and a female die disposed in the die case to define an extrusion hole between the male die and the female die, wherein the pressure receiving surface is formed into a convex configuration protruded rearward, and a porthole for introducing themetallicmaterial is providedin an outerperiphery of thepressure receiving portion, wherein a ratio of an opening area of an inlet portion of the porthole defined by a plan view as seen from an axial upstream side (a plan state opening area of the inlet portion of the porthole) to an area of the pressure receiving portion defined by a plan view as seen from the axial upstream side (a plan state area of the pressure receiving portion) is set to 0.15 to 0.80, and wherein the extrusion die
  • extrusion die for a metallic material as recited in any one of the aforementioned Items 1 to 5 , wherein the extrusion hole is formed into a flat cross-sectional configuration with a width larger than a thickness , and wherein the portholes are formed at positions corresponding to thickness directional both sides of the extrusion die.
  • the extrusion die for a metallic material as recited in any one of the aforementioned Items 1 to 6 wherein the male die and the female die define a flat circular extrusion with a height (thickness) smaller than a width, wherein aportion of themale die corresponding to the extrusion hole is formed into a comb-like configuration having a plurality of passage forming protrusions arranged in a width direction, and wherein the extrusion die is configured such that the metallic material passes through the extrusion hole to form a multi-passage hollow member with a plurality of passages arranged in a width direction.
  • a production method of an extruded article comprising the step of forming an extruded article using the extrusion die as recited in any one of the aforementioned Items 1 to 9. 0 [H] A production method of a multi-passage hollow member, comprising the step of forming an multi-passage extruded article using the extrusion die as recited in the aforementioned Item 7.
  • a production method of an extruded tubular member, 5 comprising the step of forming the extruded article using the extrusion die as recited in the aforementioned Item 8.
  • a die case for an extrusion die comprising a pressure receiving portion with an outer surface functioning as a metallic material pressure receiving surface faced rearward against an extrusion direction of the metallic material, the die case being configured to mount a male die and a female die therein, wherein the pressure receiving surface is formed into a convex configuration protruded rearward, and a porthole for introducing themetallicmaterial is provided in an outerperipheryof thepressure receiving portion, wherein a ratio of an opening area of an inlet portion of the porthole defined by a plan view as seen from an axial upstream side (a plan state opening area of the inlet portion of the porthole) to an area of the pressure receiving portion defined by a plan view as seen from the axial upstream side (a plan state area of the pressure receiving portion) is set to 0.15 to 0.80,
  • An extrusion method for a metallic material comprising the steps of: preparing a die case, wherein the die case comprises a pressure receiving portion with an outer surface functioning as a metallic material pressure receiving surface faced rearward against an extrusion direction of the metallic material, a male die mounted in the die case, and a female die mounted in the die case for defining an extrusion hole between the male die and the female die, wherein the pressure receiving surface is formed into a convex configuration protruded rearward, and a porthole for introducing the metallic material is provided in an outer periphery of the pressure receiving portion, and wherein a ratio of an opening area of an inlet portion of the porthole defined by a plan view as seen from an axial upstream side (a plan state opening area of the inlet portion of
  • An extruder for a metallic material equipped with a container and an extrusion die set in the container and configured to supply the metallic material in the container to the extrusion die comprises: a die case having a pressure receiving portion with an outer surface functioning as a metallic material pressure receiving surface, the die case being disposed with the metallic material pressure receiving surface faced rearward against an extrusion direction of the metallic material; a male die disposed in the die case; and a female die disposed in the die case to define an extrusion hole between the male die and the female die, wherein the pressure receiving surface is formed into a convex configuration protruded rearward, and a porthole for introducing themetallicmaterial is providedinanouterperipheryof thepressure receiving portion, wherein a ratio of an opening area of an inlet portion of the porthole defined by a plan view as seen from an axial upstream side (a plan state opening area of the inlet portion of the porthole) to an area of the pressure receiving portion defined by a plan
  • An extrusion die for a metallic material comprising: a die case having a pressure receiving portion with an outer surface functioning as a metallic material pressure receiving surface, the die case being disposed with the metallic material pressure receiving surface faced rearward against an extrusion direction of the metallic material; a male die disposed in the die case; and a female die disposed in the die case to define an extrusion hole between the male die and the female die, wherein the pressure receiving surface is formed into a convex configuration protruded rearward, a porthole for introducing the metallic material is provided in an outer periphery of the pressure receiving portion, and an opening area of the inlet portion of the porthole is set to be larger than a passage cross-sectional area of an inside of the porthole, and wherein the extrusion die is configured such that the metallic material pressurized against the metallic material pressure receiving surface is introduced into the die case via the porthole and passes through the extrusion hole.
  • extrusion die for a metallic material as recited in any one of the aforementioned Items 17 to 25 , wherein the extrusion hole is formed into a flat cross-sectional configuration with a width larger than a thickness, and wherein the portholes are formed at positions corresponding to thickness directional both sides of the extrusion die.
  • extrusion die for a metallic material as recited in any one of the aforementioned Items 17 to 26, wherein the male die and the female die define a flat circular extrusion hole with a height (thickness) smaller than a width, wherein aportion of themale die corresponding to the extrusion hole is formed into a comb-like configuration having a plurality of passage forming protrusions arranged in a width direction, and wherein the extrusion die is configured such that the metallic material passes through the extrusion hole to form a multi-passage hollow member with a plurality of passages arranged in a width direction.
  • extrusion die for a metallic material as recited in any one of the aforementioned Items 17 to 26, wherein the male die and the female die define a circular extrusion hole, and wherein the extrusion die is configured such that the metallic material passes through the extrusion hole to form a tubular member circular in cross-section.
  • a production method of an extruded tubular member comprising the step of forming the extruded tubular member using the extrusion die as recited in the aforementioned Item 28.
  • a die case for an extrusion die comprising a pressure receiving portion with an outer surface functioning as a metallic material pressure receiving surface faced rearward against an extrusion direction of the metallic material, the die case being configured to mount a male die and a female die therein, 5 wherein the pressure receiving surface is formed into a convex configuration protruded rearward, a porthole for introducing the metallic material is provided in an outer periphery of the pressure receiving portion, and an opening area of the inlet portion of the porthole is set to be larger than a passage cross-sectional area
  • the die case is configured such that the metallic material pressurized against the metallic material pressure receiving surface is introduced into the die case via the porthole and passes through the extrusion hole.
  • An extrusion method for a metallic material comprising the steps of: preparing a die case, wherein the die case comprises a pressure receiving portion with an outer surface functioning as a metallic 5 material pressure receiving surface faced rearward against an extrusion direction of the metallic material, a male die mounted in the die case, and a female die mounted in the die case for defining an extrusion hole between the male die and the female die, wherein the pressure receiving surface is formed into a convex configuration protruded rearward, and a porthole for introducing the metallic material is provided in an outer periphery of the pressure receiving portion, and wherein an opening area of the inlet portion of the porthole is set to be larger than a passage cross-sectional area of an inside of the porthole; and introducing the metallic material pressurized against the metallic material pressure receiving surface into the die case via the porthole to pass through the extrusion hole.
  • An extruder for a metallic material equipped with a container and an extrusion die set in the container and configured to supply the metallic material in the container to the extrusion die wherein the extrusion die comprises : a die case having a pressure receiving portion with an outer surface functioning as a metallic material pressure receiving surface, the die case being disposed with the metallic material pressure receiving surface faced rearward against an extrusion direction of the metallic material; a male die disposed in the die case; and a female die disposed in the die case to define an extrusion hole between the male die and the female die, wherein the pressure receiving surface is formed into a convex 007/069536 configuration protruded rearward, and a porthole for introducing themetallicmaterial is providedinanouterperipheryof thepressure receiving portion, wherein an opening area of the inlet portion of the porthole > is set to be larger than a passage cross-sectional area of an inside of the porthole, and wherein the extrusion die is configured such that the metallic material pressurized
  • the pressure receiving surface is formed into a convex surface configuration, when the metallic material is pressed against the pressure receiving surface , the pressing force of the metallic material can be received by the pressure receiving surface in a dispersed manner , which can decrease 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 increased, which makes it possible to attain sufficient durability.
  • the compressing force toward the axis of the pressure receiving portion will be applied to each portion of the pressure receiving surface, which reduces the shearing force to be generated at the die case at the time of the extrusion processing .
  • the shearing force to be generated at the portion can be reduced, which in turn can increase the strength of the die against the pressing force of the metallic material.
  • the porthole for introducing a material is formed in the pressure receiving portion of the die case covering the male die and the female die.
  • the front end (downstream side) wall portion of the pressure receiving portion is integrally formed in a circumferentially continued manner.
  • the existence of this continuous peripheral wall can further increase the strength of the die case, which in turn can further increase the strength of the entire extrusion die .
  • there is no portion weak in strength, such as a conventional bridge portion and therefore it is not required to increase the size , such as , e.g., the thickness , beyond the necessity for the purpose of increasing the strength, which makes it possible to attain the size and weight reduction as well as the cost reduction.
  • the metallic material can be smoothly introduced into the inside of the die from the porthole inlet portion, resulting in decreased extrusion pressure (extrusion load) of themetallic material against the pressure receiving surface. Therefore, extrusion processing can be performed smoothly and efficiently and longer die life can be attained.
  • the extrusion pressure of the metallic material to the pressure receiving surface can be more assuredly dispersed in a balanced manner, which in turn can make it possible to more assuredly increase the strength against the pressingforce of themetallicmaterial.
  • the pressure receiving surface constituted by a specific convex spherical surface
  • compressing force in the direction toward the center of the pressure receiving portion will be more assuredly applied to eachportion of the pressure receiving surface, which more assuredly reduces the shearing force to be generated in the die case at the time of extrusion processing.
  • the shearing force to be generated at the portion can be reduced, which in turn can increase the strength of the die against the pressing force of the metallic material.
  • the metallic material can be evenly introduced toward the extrusion hole from the circumferential direction of the die, enabling stable extrusion.
  • themetallicmaterial can be evenly introduced toward the extrusion hole from the porthole .
  • a flat extruded product can be formed with a high degree of dimensional accuracy.
  • amulti-passage hollowmember with a plurality of passages arranged in the width direction can be formed assuredly.
  • an aluminum or aluminum alloy extruded article can be produced.
  • the extrusion pressure of the metallic material to the pressure receiving surface can be more assuredly dispersed in a balanced manner, which in turn can make it possible to more assuredly increase the strength against the extrusion force of the metallic material .
  • an extrusion method for a metallic material having the same effects as mentioned above can be provided.
  • an extruder for ametallic material having the same effects as mentioned above can be provided.
  • the pressure receiving surface is formed into a convex surface configuration, when the metallic material is pressed against the pressure receiving surface , the pressing force of the metallic material can be received by the pressure receiving surface in a dispersed manner, resulting in reduced extrusion force in the normal direction at each portion of the pressure receiving surface .
  • the strength against the pressing force of the metallic material can be increased, resulting in sufficient durability.
  • the front end (downstream side) wall portion of the pressure receiving portion is integrally formed in a circumferentially continued manner.
  • the existence of this continuous peripheral wall can further increase the strength of the die case, which in turn can further increase the strength of the entire extrusion die.
  • there is no portion weak in strength, such as a conventional bridge portion and therefore it is not required to increase the size, such as, e.g. , the thickness, beyond the necessity for the purpose of increasing the strength, which makes it possible to attain the size and weight reduction as well as the cost reduction.
  • the metallic material can be smoothly introduced from the inlet portion, resulting in reduced pressing force (extrusion load) to the pressure receiving surface of the metallic material. This in turn enables efficient and smooth extrusion processing.
  • the void gap rate of the die case by the portholes becomes small, which can further increase the strength of the die case, which in turn can further increase the strength of the entire die.
  • the porthole is configured such that a passage cross-sectional area gradually decreases from the inlet portion toward an inside of the porthole, no sudden change in flow resistance of the metallic material passing through the porthole occurs , which makes it possible to more smoothly pass the metallic material through the porthole.
  • the extrusion pressure of the metallic material to the pressure receiving surface can be more assuredly dispersed in a balanced manner, which in turn can make it possible to more assuredly increase the strength against the extrusion force of the metallic material.
  • the metallic material is pressed against the pressure receiving surface constituted by a specific convex spherical surface, compressing force in the direction toward the center of the pressure receiving portion will be more assuredly applied to eachportion of the pressure receiving surface, which more assuredly reduces the shearing force to be generated in the die case at the time of extrusion processing.
  • the shearing force to be generated at the portion can be reduced, which in turn can increase the strength of the die against the pressing force of the metallic material.
  • the metallic material can be evenly introduced toward the extrusion hole from the circumferential direction of the die, enabling stable extrusion.
  • a flat extruded product can be formed with a high degree of dimensional accuracy.
  • the extrusion pressure of the metallic material to the 5 pressure receiving surface can be more assuredly dispersed in a balanced manner, which in turn can make it possible to more assuredly increase the strength against the extrusion force of the metallic material.
  • Fig.1 is a perspective view showing an extrusion die according to a first embodiment of the present invention
  • Fig. 2 is an exploded perspective view showing the extrusion > die according to the first embodiment
  • Fig. 3 is a rear view (top view) showing the extrusion die according to the first embodiment
  • Fig. 4 is a cutout perspective view showing the extrusion die according to the first embodiment
  • Fig. 5 is a cross-sectional view showing the extrusion die according to the first embodiment
  • Fig. 6 is another cross-sectional view showing the extrusion die according to the first embodiment
  • Fig.7 is an enlargedcutout perspectiveview showing the inside of the extrusion die according to the first embodiment
  • Fig. 8 is an explanatory plan view of a plan state area of the pressure receiving portion and a plan state opening area of the porthole inlet portion of the extrusion die according to the first embodiment;
  • Fig.9 is a perspective cutout principal portion of an extruder to which the extrusion die of the first embodiment is applied;
  • Fig. 10 is a cross-sectional view showing the extrusion die of the first embodiment and the vicinity thereof in an extruder;
  • Fig.11 is another cross-sectional view showing the extrusion die of the first embodiment and the vicinity thereof in the extruder;
  • Fig. 12 is a perspective view showing a multi-passage hollow member extruded with an extruder according to the first embodiment
  • Fig. 13 is an enlarged front cross-sectional view showing the multi-passage hollow member extruded with the extruder of the first embodiment ;
  • Fig. 14 is a cross-sectional view showing an extrusion die according to a first modification of this invention;
  • Fig. 15 is a perspective cutout view showing an extrusion die according to a second modification of this invention.
  • Fig. 16 is a cross-sectional view showing the extrusion die according to the second modification of this invention.
  • Fig. 17 is a cross-sectional view showing an extrusion die according to a third modification of this invention.
  • Fig. 18 is a cross-sectional view showing an extrusion die according to a fourth modification of this invention
  • Fig.19 is aperspective view showing an extrusion die according to a second embodiment of this invention
  • Fig. 20 is an exploded perspective view showing the extrusion die according to the second embodiment
  • Fig. 21 is a cutout perspective view showing the extrusion die according to the second embodiment
  • Fig. 22 is a cross-sectional view showing the extrusion die according to the second embodiment
  • Fig. 23 is another cross-sectional view showing the extrusion die according to the second embodiment
  • Fig .24 is an enlarged cutout perspective view showing an inside of the extrusion die according to the second embodiment; 007/069536
  • Fig.25 is a cutout perspectiveview showing aprincipleportion of an extruder to which the extrusion die according to the second embodiment is applied;
  • Fig. 26 is a cross-sectional view showing a die according to > the secondembodiment andthevicinity thereofmounted in anextruder;
  • Fig.27 is another cross-sectional view showing a die according to the second embodiment and the vicinity thereof mounted in an extruder;
  • Fig. 28 is a perspective view showing a multi-passage hollow member extruded with the extruder of the second embodiment
  • Fig. 29 is an enlarged front view of the multi-passage hollow member extruded with the extruder of the second embodiment
  • Fig .30 is aperspectiveview showing an extrusion die according to a third embodiment of this invention
  • Fig. 31 is an exploded perspective view showing the extrusion die according to the third embodiment
  • Fig. 32 is a cutout perspective view showing the extrusion die according to the third embodiment ;
  • Fig. 33 is a cross-sectional view showing the extrusion die according to the third embodiment ;
  • Fig.34 is aperspective view showing an extrusion die according to a fourth embodiment of this invention.
  • Fig. 35 is an exploded perspective view showing the extrusion die according to the fourth embodiment ;
  • Fig. 36 is a cutout perspective view showing the extrusion die according to the fourth embodiment ;
  • Fig. 37 is a cross-sectional view showing the extrusion die according to the fourth embodiment;
  • Fig. 38 is a cross-sectional view showing a die case of the extrusion die according to the fourth embodiment;
  • Fig.39 is aperspectiveview showing an extrusion die according to a fifth embodiment of this invention.
  • Fig. 40 is an exploded perspective view showing the extrusion die according to the fifth embodiment.
  • Fig. 41 is a cutout perspective view showing the extrusion die according to the fifth embodiment ;
  • Fig. 42 is a cross-sectional view showing the extrusion die according to the fifth embodiment.
  • Fig. 43 is a cross-sectional view showing a die case of the extrusion die according to the fifth embodiment;
  • Fig. 44A is a perspective exploded view showing a porthole die as a conventional extrusion die;
  • Fig. 44B is a perspective exploded view showing a spider die as a conventional extrusion die.
  • Fig. 44C is a perspective view showing a bridge die as a conventional extrusion die.
  • Figs. 1 to 13 are explanatory views showing an extrusion die for ametallic material according to a first embodiment of the present invention.
  • This extrusion die 10 for a metallic material according to the first embodiment is designed to extrude a multi-passage hollow member (flat multi-passage tube) 60 as shown in Figs. 12 and 13.
  • the hollow member 60 is a metal member.
  • this hollow member 60 constitutes a heat exchanging tube made of aluminum or aluminum alloy.
  • This hollow member 60 is a flat member having a width larger than the thickness for use in heat exchangers, such as, e.g., condensers for car air-conditioners.
  • the hollow portion 61 of this hollow member 60 extends in the tube length direction and is divided into a plurality of heat exchanging passages 63 by a plurality of partitions 62 arranged in parallel with each other. These passages 63 extend in the tube length direction and are arranged in parallel with each other.
  • a direction with which a tube length direction perpendicularly intersects and along which the passages 63 are arranged will be referred to as a "width direction” or a “lateral direction,” and a direction with which a tube length direction perpendicularly intersects and with which the width direction perpendicularly intersects will be referred to as a “height direction (thickness direction)” or a “vertical direction.”
  • the "upstream side” with respect to the extrusion direction will be referred to as a "rear side”
  • the "downstream side” thereof will be referred to as a "front side.”
  • Figs.1 to 7 show an extrusion die 10 of this first embodiment.
  • the extrusion die 10 of this embodiment is equipped with a die case 20, a male die 30, a female die 40, and a flow control plate 50.
  • the die case 20 has a hollow structure having a dome-shaped pressure receiving portion 21 provided at the upstream side (rear side) with respect to the extrusion direction of a metallic billet as ametallic material and abase portion 25 provided at the downstream side (front side) .
  • the surface (rear surface) of the pressure receiving portion 21 opposed against the extrusion direction of a metallic billet is formed into a billet pressure receiving surface 22 functioning as a metallic material pressure receiving surface.
  • This billet pressure receiving surface 22 is formed into a convex surface configuration protruded in a direction opposite to the extrusion direction (i.e. , in the rear direction) . Concretely, this pressure receiving surface 22 is formed into a hemispherical convex configuration. Thus, the pressure receiving surface 22 is formed so as to protrude rearward.
  • a male die holding slit 23 communicated with an internal hollow portion (welding chamber 12) is formed along the axis Al of the die case 20.
  • This male die holding slit 23 is formed into a flat rectangular cross-sectional configuration corresponding to the cross-sectional configuration of the male die 30. Furthermore, as shown in Fig. 6, at both side portions of the rear end side of the male die holding slit 23, engaging stepped portions 23a and 23a for engaging the male die 30, which will be mentioned later, are formed.
  • each porthole 24 and 24 are formed at both sides of the axis Al.
  • the inlet portion 24e of each porthole 24 is formed into an approximately trapezoidal configuration as seen from the upstream side of the axial direction.
  • the pair of portholes 24 and 24 are arranged so that the outlet portions (front end portions) thereof face toward the below-mentioned extrusion hole 11.
  • each porthole 24 is disposed such that
  • the axis A2 thereof approaches the axis Al of the pressure receiving portion 21 as it advances toward the downstream side and intersects with the axis Al of the pressure receiving portion 21 in an inclined state.
  • the detail structure of, e.g., the inclination angle ⁇ of the axis A2 of the porthole 24 and the area of the porthole 24 will be described in detail below.
  • the base portion 25 is integrally formed to the pressure receiving portion 21, and formed into an annular shape centered on the axis Al.
  • the base portion 25 has a diameter larger than the diameter of the pressure receiving portion 21. 0
  • the base portion 25 and the pressure receiving portion 21 are not required to be integrally formed, and can be formed separately. Whether both the members 21 and 25 should be integrally formed or separately formed can be arbitrarily selected 5 in consideration of the maintenance performance, etc.
  • a cylindrical female die holding hole In the base portion 25, a cylindrical female die holding hole
  • this female die holding hole 26 communicated with a welding chamber 12 and corresponding to the cross-sectional shape of the female die 40 is formed.
  • the axis of this female die holding hole 26 is constituted so as to align with the axis Al of the die case 20.
  • an engaging stepped portion 26a for engaging a female die 40 which will be explained later, via a flow control plate 50 is formed.
  • the front principle portion of the male die 30 is constituted as a mandrel 31.
  • the front end portion of the mandrel 31 is configured to form the hollow portion 61 of the hollow member 60 and has a plurality of passage forming protruded portions 33 each corresponding to each passage 63 of the hollow member 60.
  • These plural passage forming protruded portions 33 are arrangedin thewidthdirection of themandrel 31 at certain intervals .
  • the gap formed between the adjacent passage forming protruded portions 33 and 33 is constituted as a partition forming groove 32 for forming the partition 62 of the hollow member 60.
  • the male die 30 is inserted into the male die holding slit
  • the mandrel 31 of the male die 30 is held in the mandrel holding slit 23 with the mandrel 31 forwardly protruded from the mandrel holding slit 23 by a certain length.
  • the basal end surface (rear end surface) of the male die 30 is formed into a partial hemispherical convex surface corresponding to the billet pressure receiving surface 22 of the die case 20.
  • the basal end surface (rear end surface) of the male die 30 and the billet pressure receiving surface 22 cooperatively form a prescribed smooth hemispherical convex surface .
  • the female die 40 is formed into a cylindrical shape andprovided with key protrusions 47 and 47 arranged in parallel with the axis Al at both sides on the external peripheral surface thereof.
  • the female die 40 is provided with a die hole (bearing hole 41) corresponding to the mandrel 31 of the male die 30 and opened at the rear end surface side and a relief hole 42 communicated with the die hole 41 and opened at the front end surface side.
  • the die hole 41 is provided with an inwardly protruded portion along the inner peripheral edge portion so that the outer peripheral portion of the hollow member 60 can be defined.
  • the relief hole 42 is formed into a tapered shape gradually increasing the thickness (height) toward the front end side (downstream side) and opened at the downstream side.
  • the flowcontrolplate 50 is formed into around shape in external periphery corresponding to the cross-sectional shape of the female die holding hole 26 of the die case 20. Corresponding to the die hole 41 of the female die 40, a central through-hole 51 is formed in the center of the flow control plate 50.
  • the flow control plate 50 has , at its both sides of the external peripheral edge portion, key protrusions 57 and 57 corresponding to the key protrusions 47 and 47 of the female die 40 are formed.
  • the female die 40 is accommodated and fixed in the female die holding hole 26 of the die case 20 via the flow control plate 50. With this state, the external peripheral surface of one end surface (rear end surface) of the female die
  • the key protrusions 47 and 47 of the female die 40 and the key- protrusions 57 and 57 of the flow control plate 50 are engaged with the keyways (not illustrated) formed on the inner peripheral surface of the female die holding hole 26, so that the female die 40 and the flow control plate 50 are positioned in the circumferential direction about the axis.
  • the mandrel 31 of the male die 30 and the die hole 41 of the female die 40 are disposed corresponding to the central through-hole 51 of the flow control plate 50.
  • the mandrel 31 of the male die 30 is disposed within the die hole 41 of the female die 40 to form a flat circular extrusion hole 11 between the mandrel 31 and the die hole 41.
  • a plurality of partition forming grooves 32 of themandrel 31 are arrangedinparallel in the width direction in the extrusion hole 11, whereby a cross-sectional shape corresponding to the cross-sectional shape of the hollow member 60 is formed.
  • each of the portholes 24 and 24 is formed such that the axis A2 of the porthole 24 inclines with respect to the axis Al of the die case 20.
  • the inclination angle ⁇ of the axis A2 of the porthole 24 with respect to the axis Al of the die case 20 is set to 3 to 45° , more preferably 10 to 35° , still more preferably 15 to 30° .
  • the metallic material flows through the portholes 24 and 24 and the welding chamber 12 in a stable manner, and then smoothly passes through around the entire periphery of the extrusion hole 11 in a balanced manner.
  • a high quality extrusion molded article (extruded article) excellent in dimensional accuracy can be formed.
  • the inclination angle ⁇ is too small, the metallic material passed through the portholes 24 and 24 and the welding chamber 12 cannot be smoothly introduced into the extrusionhole 11, whichmay sometimes make it difficult to stably obtain a high quality extrusion molded article.
  • the inclination angle ⁇ is too large, the material flowing direction of the porthole 24 inclines largely, which increases the metallic material extrusion resistance, and therefore it is not preferable.
  • plan state area Sa of the pressure receiving portion 21 when the area of the pressure receiving portion 21 defined by the plan view as seen from the upstream side of the axial direction is defined as "a plan state area Sa of the pressure receiving portion 21, " and the opening area of the porthole inlet portion 24e defined by the plan view as seen from the upstream side of the axial direction is defined as "a plan state opening area Sb of the porthole inlet portion 24e," the plan state area Sa of the pressure receiving portion 21 is specified by the illustrated left inclination shaded area, while the plan state opening area Sb of the porthole inlet portion 24e is specified bythe illustratedright inclination shadedarea.
  • the ratio (2 x Sb/Sa) of the plan state opening area (2 x Sb) of the porthole inlet portions 24e to the plan state area Sa of the pressure receiving portion 21 so as to fall within the range of 0.15 to 0.80. It is preferably set to 0.25 to 0.75, more preferably 0.3 to 0.75. That is , when the area ratio ( 2 x Sb/Sa) is set within the aforementioned range, the billet as a metallic material can be stably introduced from the porthole inlet portions 24e into the die while keeping sufficient plan state opening area of the porthole inlet portion 24e, which makes it possible to obtain an extruded product with high quality.
  • the billet pressure receiving surface 22 of the die case 20 is constituted by a convex spherical surface of a 1/6 to 4/6 sphere.
  • the billet pressure receiving surface 22 is constituted by the aforementioned specific convex spherical configuration, the pressing force of a metallic billet canbemore assuredly receivedby the billet pressure receiving surface 22 in a well-balanced dispersed manner, resulting in sufficient strength, which in turn can more assuredly extend the die life. That is, when a billet is pressed against the pressure receiving surface 22 having the specific convex spherical configuration, compressing force toward the center of the pressure receiving portion 21 is more assuredly applied to each portion of the pressure receiving surface 22.
  • the shearing force to be generated at the die case 20 at the time of the extrusion will be assuredly reduced.
  • the portion of the die case 20 exposed to the hollow portion thereof which is the portion where the largest shearing forcewill be generated, canbe reducedassuredly.
  • the strength of the die 10 against the pressing force of the billet can be improved more assuredly.
  • it also makes it possible to simplify the die configuration, reduce the size and weight, and also attain the cost reduction.
  • the billet pressure receiving surface 22 is formed into a configuration constituted by a convex spherical surface of a sphere smaller than sphere, such as, e.g.
  • a convex spherical surface constituted by a 1/8 sphere sufficient strength against the billet pressing force cannot be obtained, which may cause deteriorated die life due to generation of cracks.
  • the billet pressure receiving surface 22 is formed into a configuration constituted by a convex spherical surface of a sphere exceeding a4/6 sphere, such as, e.g., a convex spherical surface configuration of a 5/6 sphere, the cost may be increased due to the complicated configuration.
  • the sphere with a ratio such as, e.g.. a 1/8 sphere, a 1/6 sphere, or a 4/6 sphere, is defined by a partial sphere obtainedby cutting aperfect spherewith aplaneperpendicular to the axis of the perfect sphere .
  • an "n/m sphere ( “m” and “n” are natural numbers, and n ⁇ m) " is defined by a partial sphere obtained by cutting a perfect sphere with a plane perpendicular to the axis of the perfect sphere at a position where a distance from a surface of the perfect sphere to an inner position of the perfect sphere on the axis (diameter) is n/m where the length of the axis (diameter) of the perfect sphere is "1.”
  • the inner side surface 24a and the outer side surface 24b among the inner periphery of the porthole 24 are arranged approximately in parallel with each other andalso approximately inparallel to the axis A2 of the porthole 24. Furthermore, the inner side surface 24a and the outer side surface 24b of the porthole inner periphery are constituted as an inclined surface (tapered surface) inclined to the axis Al of the die case 20, respectively.
  • the extrusion die 10 having the aforementioned structure is set in an extruder as shown in Figs.9 to 11. That is, the extrusion die 10 of this embodiment is set to a container 6 with the extrusion die 10 fixed in the die installation hole 5a formed in the center of a plate 5.
  • the extrusion die 10 is fixed by the plate 5 in a direction perpendicular to the extrusion direction and also fixed by a backer (not illustrated) in the extrusion direction.
  • a metallic billet (metallic material), such as, e.g., an aluminum billet, inserted in the container 6 is pressed in the right direction (extrusion direction) in Fig. 9 via a dummy block 7.
  • the metallic billet is pressed against the billet pressure receiving surface 22 of the die case 20 constituting the extrusion die 10 to be plastically deformed.
  • themetallic material passes through the pair of portholes 24 and 24 while being plastically deformed and then reaches the welding chamber 12 of the die case
  • the metallic material is forwardly extruded through the extrusionhole 11 into a cross-sectional configuration corresponding to the opening configuration of the extrusion hole 11.
  • a metallic extruded article (hollow member 60) is manufactured.
  • the billet pressure receiving surface 22 is formed into a convex spherical configuration, when the metallic billet is pressed against the billet pressure receiving surface 22, the pressing force can be received by the pressure receiving surface 22 in a dispersed 0 manner. Therefore, the pressing force to be applied to each portion of the billet pressure receiving surface 22 in the direction of a normal line can be reduced, thereby increasing the strength against the pressing force of the metallic material, which results in sufficient durability. 5
  • plan state opening area Sb of the porthole inlet portions 24e with respect to the plan state area Sa of the pressure receiving portion 21 is set to a specific value, it becomes possible to smoothly introduce the billet into the inside of the die from the porthole inlet portions 24e.
  • the pressing force (extrusion load) of the billet against the pressure receiving surface 22 can be decreased appropriately, resulting in efficient and smooth extrusion.
  • a high quality extruded product can be manufactured.
  • the portholes 24 for introducing material are formed in the pressure receiving portion 21 covering the male die 30 and the female die 40.
  • the front end wall portion of the pressure receiving portion 21 and the wall portion of the base portion 25 are formed integrally and continuously in the peripheral direction.
  • the existence of this continued peripheral wall portion can further increase the strength of the die case 20, which in turn can further increase the strength of the entire extrusion die.
  • there is no portion weak in strength, such as a conventional bridge portion and therefore it is not required to increase the size, such as, e.g. , the thickness, beyond the necessity for the purpose of increasing the strength, which makes it possible to attain the size and weight reduction as well as the cost reduction.
  • the portholes 24 and 24 are formed at positions away from the axis Al of the pressure receiving portion 21, i.e., the outer periphery of the pressure receiving portion 21, and the axis A2 of each porthole 24 is inclined with respect to the axis Al of the die case 20 so as to gradually approach the axis Al of the die case 20 toward the downstream side . Therefore, the metallic material passing through the portholes 24 and 24 can be stably extruded while being smoothly introduced toward the axis Al, i.e., the extrusion hole 11. Furthermore, in this embodiment, since the downstream side end portions (outlets) of the portholes 24 and 24 are faced toward the extrusion hole 11 , themetallic material can be more smoothly introduced to the extrusion hole 11.
  • the metallic material can be more smoothly introduced into the extrusion hole 11 in a stablemanner. Accordingly, themetallic material is extrudedwhile evenly passing through the entire area of the extrusion hole 11 in a well-balanced manner, to thereby obtain a high quality extruded hollow member 60.
  • the die life was extended about three times as compared with a conventional one.
  • the extrusion limit speed can be raised considerably.
  • the upper limit of the extrusion speed was 60 m/min.
  • the upper limit of the extrusion speed can be raised to 150 m/min, i.e. , the extrusion limit speed can be raised about 2.5 times , and therefore the productive efficiency can be further improved.
  • the pressure receiving portion 21 is the pressure receiving portion 21
  • pressure receiving surface 22 is formed into a hemisphere convex configuration (hemisphere convex surface) .
  • pressure receiving surface 22 is not limited to the above..
  • the pressure receiving surface 22 can be formed into a polyhedral configuration constituted by a number of surfaces. That is, the pressure receiving surface
  • each side surface constituting the pressure receiving surface 22 can be, for example, a flat surface or a curved surface.
  • the pressure receiving portion 21 can be formed into a laterally elongated configuration longer in lengthwise direction than in crosswise direction, the lengthwise direction andthe crosswise directionbeingperpendicular to the axial direction .
  • the pressure receiving portion 21 can be formed into a laterally elongated elliptical configuration as seen from the axial upstream side or a laterally elongated oval configuration as seen from the axial upstream side.
  • the pressure receiving portion 21 can be formed into a configuration with an axial direction protruded dimension longer than the radial dimension perpendicular to the axial direction, e.g., a semi-elliptical configuration.
  • the die case 20 is integrally formed.
  • the present invention is not limited to the above, and the die case can be divided into two or more parts.
  • the die case 20 can be constituted by two members, i.e., a male die case for holding the male die 30 and a female die case for holding the female die 40.
  • the male die 30 , the female die 40 , the flow control plate 50 are formed separately from the die case 20.
  • the present invention is not limited to the above, and at least one of the male die 30, the female die 40, and the flow control plate 50 can be formed integrally with the die case 20. Furthermore, in the present invention, the flow control plate 50 can be omitted as needed.
  • the explanation was directedto the die for extruding aflatmulti-passage tubular member.
  • the configuration of the extruded product is not specifically limited.
  • it can be constituted such that a male die is provided with a mandrel round in cross-section and a female die is provided with a die hole round in cross-section so that a circular ring-shaped extrusion hole is defined between the mandrel and the die hole to extrude a round tubular member.
  • each porthole inlet portion 24e is not specifically limited. Incases where a plurality of portholes 24 are formed, each porthole inlet portion 24e can be different in configuration or different in plan state opening area of each porthole inlet portion. In summary, it is sufficient that the ratio of the total plan state opening area of the porthole inlet portions 24e to the plan state area of the pressure receiving portion 21 is set so as to fall within the aforementioned range.
  • the opening area of the porthole inlet portion 24e is formed to be larger than the passage cross-sectional area of the inside of the porthole 24.
  • the present invention for example, like the first modification shown in Fig. 14, it can be configured such that the inclination angle ⁇ a of the inner side surface 24a of the porthole inner peripheral surface with respect to the axis Al of the pressure receiving portion 21 is set to be smaller than the inclination angle ⁇ b of the outer side surface 24b of the porthole inner peripheral surface with respect to the axis Al of the pressure receiving portion 21 so that the thickness (radial direction length) of the porthole inlet portion 24e is larger than the thickness of the inside of the porthole 24.
  • the width of the porthole inlet portion 24e can be formed to be larger than the width of the inside of the porthole 24.
  • an inner chamfered portion 241 is formed by cutting the corner portion between the inner side surface 24a of the porthole inner peripheral surface and the outer side surface of the pressure receiving portion 21 (pressure receiving surface 22) so that the opening area of the porthole inlet portion 24e becomes larger than the passage cross-sectional area of the inside of the porthole 24.
  • both the outer chamfered portion 242 and the inner chamfered portion 241 are formed so that the opening area of the porthole inlet portion 24e becomes larger than the passage cross-sectional area of the inside of the porthole 24.
  • the base portion 25 is provided at the front end portion of the die case 20. In the present invention, however, it is not always to provide the base portion 25.
  • the explanation was directed to the case in which only a single extrusion die is set in a container.
  • the present invention is not limited to the above.
  • the extruder according to the present invention it can be configured such that two or more extrusion dies are set in a container.
  • the rear end face (basal end face) of the male die 30 is formed as a part of the convex surface (spherical surface) corresponding to the billet pressure receiving surface 22 of the pressure receiving portion 21 and that the rear end face of the male die 30 and the billet receiving surface 22 constitute a prescribed smooth convex surface (spherical surface).
  • the configuration of the rear end face (basal end face) of the male die 30 is not limited to the above, and can be, for example, formed into the following configuration . That is , in the present invention , in cases where the surface area of the rear end face of the male die 30 is, for example, 1/3 or less of the surface area of the billet pressure receiving surface 22 of the die 10, the rear end face of the male die 30 can be constituted by a part of a columnar external peripheral surface in which the rear end face is circular corresponding to the billet pressure receiving surface 22 in the width direction (longitudinal direction) and straight in the thickness direction (direction perpendicular to the longitudinal direction) because of the following reasons .
  • an extrusion die 10 corresponding to the first embodiment was prepared.
  • the pressure receiving portion 21 of the die case 20 of the die 10 had two portholes 24 formed at both thickness direction sides of the extrusion hole 11.
  • the inclination angle ⁇ of the porthole 24 was adjusted to 10° .
  • the billet pressure receiving surface 22 was formed into a 1/2 spherical configuration (convex spherical configuration) having a radius of 30 mm.
  • the ratio (2xSb/Sa) of the total plan state opening area Sb of the porthole inlet portions 24e to the plan state area Sa of the pressure receiving portion 21 was set to 0.1 (the area ratio per porthole was set to 0.05).
  • the male die 30 was adjusted to 2.0 mm in height (thickness) of mandrel 31, 19.2 mm in width of mandrel 31, 1.2 mm in height of passage forming protruded portion 33, 0.6 mm in width of passage forming protrudedportion 33 , and 0.2 mm inwidth of partition forming groove 32.
  • the female die 40 was adjusted to 1.7 mm in height of die hole 41 and 20.0 mm in width of die hole 41.
  • the extrusion die 10 was set to an extruder similar to the extruder shown in the first embodiment and extrusion was performed to produce a flat multi-passage tubular member 60 (heat exchanging tubular member) as shown in Figs. 12 and 13.
  • the die life (the amount (tons) of material introduced until cracks or wear occurs) and the extrusion load were measured, and the die life limiting factors were investigated. The results are also shown in Table 1.
  • the "porthole area” denotes the “plan state opening area of the porthole inlet portions 24e
  • the "pressure receiving portion area” denotes the "plan state area of the pressure receiving portion 21.”
  • the ratio (2xSb/Sa) of the total plan state opening area Sb of the porthole inlet portions 24e to the plan state area Sa of the pressure receiving portion 21 was set to 0.15 (the area ratio per porthole was set to 0.075).
  • An extrusion die 10 having the same structure other than the above was prepared, and extrusion was performed in the same manner as mentioned above to evaluate in the same manner as mentioned above.
  • the ratio (2xSb/Sa) of the total plan state opening area Sb of the porthole inlet portions 24e to the plan state area Sa of the pressure receiving portion 21 was set to 0.25 (the area ratio per porthole was set to 0.125).
  • An extrusion die 10 having the same structure other than the above was prepared, and extrusion was performed in the same manner as mentioned above to evaluate in the same manner as mentioned above.
  • Example 4 As shown in Table 1, the ratio (2xSb/Sa) of the total plan state opening area Sb of the porthole inlet portions 24e to the plan state area Sa of the pressure receiving portion 21 was set to 0.30 (the area ratio per porthole was set to 0.15).
  • the ratio (2xSb/Sa) of the total plan state opening area Sb of the porthole inlet portions 24e to the plan state area Sa of the pressure receiving portion 21 was set to 0.40 (the area ratio per porthole was set to 0.20).
  • An extrusion die 10 having the same structure other than the above was prepared, and extrusion was performed in the same manner as mentioned above to evaluate in the same manner as mentioned above .
  • the ratio (2xSb/Sa) of the total plan state opening area Sb of the porthole inlet portions 24e to the plan state area Sa of the pressure receiving portion 21 was set to 0.60 (the area ratio per porthole was set to 0.30).
  • An extrusion die 10 having the same structure other than the above was prepared, and extrusion was performed in the same manner as mentioned above to evaluate in the same manner as mentioned above .
  • the ratio (2xSb/Sa) of the total plan state opening area Sb of the porthole inlet portions 24e to the plan state area Sa of the pressure receiving portion 21 was set to 0.65 (the area ratio per porthole was set to 0.325).
  • An extrusion die 10 having the same structure other than the above was prepared, and extrusion was performed in the same manner 5 g
  • the ratio (2xSb/Sa) of the total plan state opening area Sb of the porthole inlet portions 24e to the plan state area Sa of the pressure receiving portion 21 was set to 0.75 (the area ratio per porthole was set to 0.375).
  • An extrusion die 10 having the same structure other than the above was prepared, and extrusion was performed in the same manner as mentioned above to evaluate in the same manner as mentioned above .
  • the ratio (2xSb/Sa) of the total plan state opening area Sb of the porthole inlet portions 24e to the plan state area Sa of the pressure receiving portion 21 was set to 0.80 (the area ratio per porthole was set to 0.40).
  • An extrusion die 10 having the same structure other than the above was prepared, and extrusion was performed in the same manner as mentioned above to evaluate in the same manner as mentioned above.
  • a bridge-type extrusion die 30 mm in radius and height (length in the extrusion direction) in 50 mm in which the pressure receiving portion was finished into a flat surface perpendicular to the extrusion direction was prepared.
  • the other structure was the same as that of the aforementioned examples .
  • This extrusion die was set to an extruder in the same manner as mentioned above to produce an extruded product, and evaluated in the same manner as mentioned above.
  • Example 2 to 8 in which the area ratio (2xSb/Sa) was adjusted to 0.15 to 0.75 the wear of the male die 30 was the life limiting factor, and was sufficiently long in die life.
  • an extrusion die 10 corresponding to the first embodiment was prepared.
  • the pressure receiving portion 21 of the die 10 had two portholes 24 formed at both thickness direction sides of the extrusion hole 11.
  • the inclination angle ⁇ of the porthole 24 was adjusted to 10° .
  • the billet pressure receiving surface 22 was constituted by a 1/8 convex spherical . surface (convex spherical configuration) having a radius of 45.4 mm. The diameter of this pressure receiving portion 21 was adjusted to 60 mm.
  • the ratio (2xSb/Sa) of the total plan state opening area Sb of the porthole inlet portions 24e to the plan state area Sa of the pressure receiving portion 21 was set to 0.30 (the area ratio per porthole was set to 0.15).
  • the male die 30 was adjusted to 2.0 mm in height (thickness) of mandrel 31, 19.2 mm in width of mandrel 31, 1.2 mm in height of passage forming protruded portion 33, 0.6 mm in width of passage forming protruded portion 33 , and 0.2 mm in width of partition forming groove 32. 5
  • the female die 40 was adjusted to 1.7 mm in height of die hole 41 and 20.0 mm in width of die hole 41.
  • the extrusion die 10 was set to an extruder similar to the extruder shown in the first example, and extrusion was performed to produce 5 a flat multi-passage tubular member 60 (heat exchanging tubular member) .
  • the extrusion die 10 was set to an extruder similar to the extruder shown in the first example, and extrusion was performed to produce a flat multi-passage tubular member 60 (heat exchanging tubular
  • L5 constituted by a 1/2 convex spherical surface and the spherical radius was set to 30.0 mm as shown in Table 2 was prepared.
  • the extrusion die 10 was set to an extruder similar to the extruder shown in the first example, and extrusion was performed to produce a flat multi-passage tubular member 60 (heat exchanging tubular O member) .
  • extrusion die 10 was set to an extruder similar to the extruder shown in the first example, and extrusion was performed to produce a flat multi-passage tubular member 60 (heat exchanging tubular member) .
  • the extrusion die 10 was set to an extruder similar to the extruder shown in the first example, and extrusion was performed to produce a flat multi-passage tubular member 60 (heat exchanging tubular member) .
  • the die life could be extended and that 5 the die production cost could be reduced.
  • the die (Example 13) with a 1/2 spherical surface sufficient die life could be secured and that the die production cost could be reduced, which was excellent in result.
  • Example 14 Compared with the die of Example 13, in the die (Example 14) in which the billet pressure receiving surface 22 was formed into a 4/6 spherical surface, the die production cost was slightly increased, which was slightly deteriorated in result among Examples 11 to 14.
  • Figs. 19 to 29 are explanatory views showing an extrusion die for metallic material according to a second embodiment of the present 0 invention.
  • This extrusion die 10 for metallic material is designed to extrude a multi-passage hollow member (flat multi-passage tube) 60 as shown in Figs. 28 and 29. 5
  • the hollow member 60 is a metal member.
  • this hollow member 60 constitutes a heat exchanging tube made of aluminum or aluminum alloy.
  • This hollow member 60 is a flat member having a width larger than the thickness for use in heat exchangers, such as, e.g., condensers for car air-conditioners.
  • the hollow portion 61 of this hollow member 60 extends in the tube length direction and is divided into a plurality of heat exchanging passages 63 by a plurality of partitions 62 arranged in parallel with each other. These passages 63 extend in the tube length direction and are arranged in parallel with each other.
  • a direction with which a tube length direction perpendicularly intersects and along which the passages 63 are arranged will be referred to as a "width direction” or a “lateral direction,” and a direction with which a tube length direction perpendicularly intersects and with which the width direction perpendicularly intersects will be referred to as a “height direction (thickness direction)” or a “vertical direction.”
  • the "upstream side” with respect to the extrusion direction will be referred to as a "rear side”
  • the "downstream side” thereof will be referred to as a "front side.”
  • Figs.19 to 24 showan extrusion die 10 of this secondembodiment .
  • the extrusion die 10 of this second embodiment is equipped with a die case 20, a male die 30, a female die 40, and a flow control plate 50.
  • the die case 20 has a hollow structure having a dome-shaped pressure receiving portion 21 provided at the upstream side (rear side) with respect to the extrusion direction of a metallic billet as ametallic material and a base portion 25 provided at the downstream side (front side) .
  • L5 pressure receiving surface 22 is formed into a convex configuration protruded in a direction opposite to the extrusion direction (i.e. , in the rear direction) . Concretely, this pressure receiving surface
  • the pressure receiving surface 22 is formed into a hemispherical convex configuration.
  • the pressure receiving surface 22 is formed so as to protrude rearward. 0
  • a male die holding slit 23 communicated with an internal hollow portion (welding chamber 12) is formed along the axis Al of the die case 20.
  • This male die holding slit 23 is formed into a flat 5 rectangular cross-sectional configuration corresponding to the cross-sectional configuration of the male die 30. Furthermore, as shown in Fig. 23, at both side portions of the rear end side of the male die holding slit 23, engaging stepped portions 23a and 23a for engaging the male die 30, which will be mentioned later, are formed.
  • each porthole 24 and 24 are formed at both sides of the axis Al.
  • the inlet portion 24e of each porthole 24 is formed into an approximately trapezoidal configuration as seen from the upstream
  • each porthole 24 is disposed such that the axis A2 thereof approaches the axis Al of the pressure receiving portion 21 as it advances toward the downstream side and intersects L5 with the axis Al of the pressure receiving portion 21 in an inclined state.
  • the detail structure of, e.g., the inclination angle ⁇ of the axis A2 of the porthole 24 will be explained later.
  • each porthole 24 is formed such that the passage 0 cross-sectional area gradually decreases from the inlet portion
  • the porthole 24 is formed such that the inclination angle ⁇ a of the inner side surface 24a 5 among the inner peripheral surface with respect to the axis Al is set to be smaller than the inclination angle ⁇ b of the outer side surface 24b with respect to the axis Al (i.e., ⁇ a ⁇ b).
  • the pair of portholes 24 and 24 are arranged so that the outlet portions (front end portions) thereof face toward the below-mentioned extrusion hole 11.
  • this second embodiment it is constituted such that the axis Al of the die case 20 and the axis of the pressure receiving portion 21 coincide with each other.
  • the base portion 25 is integrally formed to the pressure receiving portion 21, and formed into an annular shape centered on the axis Al.
  • the base portion 25 has a diameter larger than the diameter of the pressure receiving portion 21.
  • the base portion 25 and the pressure receiving portion 21 are not required to be formed integrally, and can be formed separately. Whether both the members 21 and 25 should be integrally formed or separately formed can be arbitrarily selected in consideration of the maintenance performance, etc.
  • this female die holding hole 26 communicated with a welding chamber 12 and corresponding to the cross-sectional shape of the female die 40 is formed.
  • the axis of this female die holding hole 26 is constituted so as to align with the axis Al of the die case 20.
  • an engaging stepped portion 26a for engaging a female die 40 which
  • the front principle portion of the male die 30 is constituted as a mandrel 31. As shown in Figs. 20 and 23, the front end portion of the mandrel 31 is configured to form the hollow portion 61 of
  • the hollow member 60 has a plurality of passage forming protruded portions 33 corresponding to passages 63 of the hollow member 60. These plural passage forming protruded portions 33 are arranged in the width direction of the mandrel 31 at certain intervals. The gap formed between the adjacent passage forming protruded portions
  • L5 33 and 33 is constituted as a partition forming groove 32 for forming the partition 62 of the hollow member 60.
  • engaging protruded portions 33a and 33a O corresponding to the engaging stepped portions 23a and 23a of the male die holding slit 23 of the die case 20 are integrally formed so as to protrude sideways .
  • the male die 30 is inserted into the male die holding slit 5 23 of the die case 20 from the side of the billet pressure receiving surface 22 and fixed therein. In this inserted state, the male die 30 is positioned with the engaging protruded portions 33a and 33a of the male die 30 engaged with the engaging stepped portions 23a and 23a. Thus, the mandrel 31 of the male die 30 is held in the mandrel holding slit 23 with the mandrel 31 forwardly protruded from the mandrel holding slit 23 by a certain length.
  • the basal end surface (rear end surface) of the male die 30 is formed into a partial hemispherical convex surface corresponding to the billet pressure receiving surface 22 of the die case 20.
  • the basal end surface (rear end surface) of the male die 30 and the billet pressure receiving surface 22 cooperatively form a prescribed smooth hemispherical convex surface.
  • the female die 40 is formedinto acylindrical shapeandprovided with key protrusions 47 and 47 arranged in parallel with the axis Al at both sides on the external peripheral surface thereof as shown in Fig. 20.
  • the female die 40 is provided with a die hole (bearing hole 41) corresponding to the mandrel 31 of the male die 30 and opened at the rear end surface side and a relief hole 42 communicated with the die hole 41 and opened at the front end surface side.
  • the die hole 41 is provided with an inwardly protruded portion along the inner peripheral edge portion so that the outer peripheral portion of the hollow member 60 can be defined.
  • the relief hole 42 is formed into a tapered shape gradually increasing the thickness (height) toward the front end side (downstream side) and opened at the downstream side.
  • the flowcontrolplate 50 is formedinto around shape inexternal periphery corresponding to the cross-sectional shape of the female die holding hole 26 of the die case 20. Corresponding to the mandrel 31 of the male die 30 and the die hole 41 of the female die 40, a central through-hole 51 is formed in the center of the flow control
  • the flow control plate 50 has, at its both sides of the external peripheral edge portion, key protrusions 57 and 57 corresponding to the key protrusions 47 and 47 of the L5 female die 40 are formed.
  • the female die 40 is accommodated and fixed in the female die holding hole 26 of the die case 20 via the flow control plate 50.
  • the external peripheral 0 surface of one end surface (rear end surface) of the female die 40 is engaged with the engaging stepped portion 26a of the female die holding hole 26 via the external peripheral edge portion of the flow control plate 50, so that the female die 40 and the flow control plate 50 arepositioned in the axial direction .
  • the key protrusions 47 and 47 of the female die 40 and the key protrusions 57 and 57 of the flow control plate 50 are engaged with the keyways (not illustrated) formed on the internal peripheral surface of the female die holding hole 26, so that the female die
  • the mandrel 31 of the male die 30 is disposed within the die hole 41 of the female die 40 to form a flat circular extrusion hole 11 between the mandrel 31 and the die hole 41. Furthermore, a plurality of partition forming grooves 32 of themandrel 31 are arrangedinparallel in the width direction in the extrusion hole 11, whereby a cross-sectional shape corresponding to the cross-sectional shape of the hollow member 60 is formed.
  • the angle difference ( ⁇ b- ⁇ a) between the inclination angle ⁇ b of the outer side surface 24b and the inclination angle ⁇ a of the inner side surface 24a is set to 3 to 37° , more preferably 5 to 25° .
  • the angle difference ( ⁇ b- ⁇ a) is set so as to fall within the above specified range, the opening area of the porthole inlet portion 24e can be kept sufficiently large, which makes it possible to stably introduce a billet as a metallic material into the inside of the die. As a result, a high quality extruded product can be formed.
  • the inclination angle ⁇ a of the inner side surface 24a of the porthole 24 it is preferable to set to 3 to 30° , more preferably 5 to 25° .
  • the inclination angle ⁇ h of the outer side surface 24b is preferably set to 10 to 40° , more preferably 20 to 30° . That is, in cases where the inclination angle ⁇ a of the inner side surface 24a excessively large or the inclination angle ⁇ b of the outer side surface 24b excessively small, a sufficient opening area of the inlet portion 24e cannot be secured, causing excessively large extrusion load of the billet, which may sometimes make it difficult to perform smooth extrusion processing.
  • the passage cross-sectional area of the porthole 24 may sometimes become excessively small as compared with the inlet portion 24e of the porthole 24, which may make it difficult to pass the billet in a stable manner.
  • each of the portholes 24 and 24 is formed such that the axis A2 inclines with respect to the axis Al of the die case 20.
  • the inclination angle ⁇ of the axis A2 of the porthole 24 with respect to the axis Al of the die case 20 is set to 3 to 45° , more preferably 10 to 35° , still more preferably 15 to 30° .
  • the inclination angle ⁇ is set so as to fall within the above specified range, the metallic material flows through the portholes 24 and 24 and the welding chamber 12 in a stable manner, and then smoothly passes through around the entire periphery of the extrusion hole 11 in a balanced manner.
  • the billet pressure receiving surface 22 of the die case 20 is constituted by a convex spherical surface of a 1/6 sphere to a 4/6 sphere.
  • the billet pressure receiving surface 22 is constituted by the aforementioned specific convex spherical configuration, the pressing force of a metallic billet can be more assuredly received by the billet pressure receiving surface 22 in a well-balanced dispersed manner, resulting in sufficient strength, which in turn can more assuredly extend the die life. That is, when a billet is pressed against the pressure receiving surface 22 having the specific convex spherical configuration, compressing force toward the center of the pressure receiving portion 21 is more assuredly applied to each portion of the pressure receiving surface 21.
  • the shearing force generated at the die case 20 at the time of the extrusion will be assuredly reduced.
  • the portion of the die case 20 exposed to the hollow portion thereof, which is the portion where the largest shearing force will be generated, can be reduced assuredly.
  • the strength of the die 10 against the pressing force of the billet can be improved more assuredly.
  • the billet pressure receiving surface 22 is formed into a configuration constituted by a convex spherical surface of a sphere smaller than a 1/6 sphere, such as,
  • the sphere with a ratio such as, e.g., 0 a 1/8 sphere, a 1/6 sphere, or a 4/6 sphere, is defined by a partial sphere obtainedby cutting aperfect spherewith aplane perpendicular to the axis of the perfect sphere.
  • an "n/m sphere ( “m” and “n” are natural numbers , and n ⁇ m) " is defined by a partial sphere obtained by cutting a perfect sphere with a 5 plane perpendicular to the axis of the perfect sphere at a position where a distance from a surface of the perfect sphere to an inner position of the perfect sphere on the axis (diameter) is n/m where the length of the axis (diameter) of the perfect sphere is "1.”
  • the extrusion die 10 having the aforementioned structure is
  • the extrusion die 10 of this embodiment is set to a container 6 with the extrusion die 10 fixed in the die installation hole 5a formed in the center of a plate 5.
  • the extrusion die 10 is fixed by the plate 5 in a direction perpendicular to the extrusion direction and also fixed
  • a metallic billet such as, e.g., an aluminum billet, inserted in the container 6 is pressed in the right direction (extrusion direction) in Fig. 25 via a dummy block 7.
  • the metallic billet is pressed against the billet pressure receiving surface 22 of the die case 20 constituting the extrusion die 10 to be plastically deformed.
  • the metallicmaterial passes through the pair of portholes 24 and 24 while being plastically deformed and then reaches the welding chamber 12 of the die case O 20.
  • the metallic material is forwardly extruded through the extrusionhole 11 into a cross-sectional configuration corresponding to the opening configuration of the extrusion hole 11.
  • a metallic extruded article (hollow member 60) is manufactured.
  • the billet pressure receiving surface 22 is formed into a convex spherical configuration, when the metallic billet is pressed against the billet pressure receiving surface 22 , the pressing force can be received by the pressure receiving surface 22 in a dispersed manner. Therefore, the pressing force to be applied to each portion of the billet pressure receiving surface 22 in the direction of a normal line can be reduced, thereby increasing the strength against the pressing force of the metallic material, which results in sufficient durability.
  • the porthole 24 is formed such that the opening area of the inlet portion 24e is larger than the passage cross-sectional area of the inside of the porthole 24, it is possible to smoothly introduce a billet from the inlet portion 24e, resulting in appropriately reduced pressing force (extrusion load) against the pressure receiving surface 22 of the billet . As a result , the extrusion processing can be smoothly performed efficiently, which in turn can produce a high quality extruded product .
  • the porthole 24 is formed so as to gradually decrease from the inlet portion 24e toward the inside, no sudden change in flow resistance of the billet passing through the portholes 24 occurs, which makes it possible to more smoothly pass the billet through the portholes 24, resulting in more effective extrusion processing. Furthermore, since the passage cross-sectional area of the inside of the porthole 24 is small, the volume (size) of the porthole 24 can be kept relatively small, resulting in a small void rate of the die case 20 by the portholes 24 , which can sufficiently increase the strength of the die case 20. This in turn can sufficiently increase the strength of the entire die.
  • the portholes 24 for introducing material are formed in the pressure receiving portion 21 covering the male die 30 and the female die 40.
  • the front end wall portion of the pressure receiving portion 21 and the wall portion of the base portion 25 are formed integrally and continuously in the peripheral direction .
  • the existence of this continued peripheral wall portion can further increase the strength of the die case 20, which in turn can further increase the strength of the entire extrusion die.
  • there is no portion weak in strength, such as a conventional bridge portion and therefore it is not required to increase the size, such as, e.g. , the thickness, beyond the necessity for the purpose of increasing the strength, which makes it possible to attain the size and weight reduction as well as the cost reduction.
  • each porthole 24 are formed at positions away from the axis Al of the pressure receiving portion 21, i.e., the outer periphery of the pressure receiving portion 21, and the axis A2 of each porthole 24 is inclined with respect to the axis Al of the die case 20 so as to gradually approach the axis Al of the die case 20 toward the downstream side. Therefore, the metallic material passing through the portholes 24 and 24 can be stably extruded while being smoothly introduced toward the axis Al , i . e . , the extrusion hole 11. Furthermore , in this second embodiment, since the downstream side end portions (outlets) of the portholes 24 and 24 are faced toward the extrusion hole 11, themetallicmaterial can bemore smoothly introduced to the extrusion hole 11.
  • the metallic material can be more smoothly introduced into the extrusion hole 11 in a stable manner . Accordingly, the metallic material is extrudedwhile evenly passing through the entire area of the extrusion hole 11 in a well-balanced manner, to thereby obtain a high quality extruded hollow member 60.
  • a metallic material can be introduced into the entire region of the extrusion hole 11 in a well-balanced manner, which can assuredly maintain the high quality.
  • a metallic material can be introduced into the entire region of the extrusion hole 11 in a well-balanced manner, which can assuredly maintain the high quality.
  • the die life was extended about three times as compared with a conventional one.
  • the extrusion limit speed can be raised considerably.
  • the upper limit of the extrusion speed was 60 m/min.
  • the upper limit of the extrusion speed can be raised to 150 m/min, i.e. , the extrusion limit speed can be raised about 2.5 times , and therefore the productive efficiency can be further improved.
  • Figs. 30 to 33 show an extrusion die 10 according to a third embodiment of this invention. As shown in these figures, this extrusion die 10 according to the third embodiment is different from the extrusion die 10 according to the second embodiment in 5 the configuration (structure) of the porthole 24.
  • Each porthole 24 is formed into an approximately trapezoidal configuration as seen from the upstream side in the axial direction.
  • This porthole 24 has an inlet portion 24e formed into a flat elongated configuration large in peripheral direction size (width) and small in radial
  • this porthole 24 is formed into an approximately fan shape with a width of the inlet portion 24e larger than that of the inside thereof.
  • the width of 0 the porthole 24 gradually decreases from the inlet portion 24e toward the inside, and the opening area of the inlet portion 24e is larger than the passage cross-sectional area of the inside of the porthole 24.
  • the inner side surface 24a of the inner peripheral surface of the porthole 24 and the outer side surface 24b thereof are arranged approximately in parallel with each other.
  • the inclination angle ⁇ a of the inner side surface 24a with respect to the axis Al and the inclination angle ⁇ b of the outer side surface 24b with respect to the axis Al are approximately equal.
  • the openingangle ⁇ w is set to 5 to 45° , morepreferably 10 to 40° .
  • the billet as a metallic material can be stably introduced from the inlet portion 24e of the porthole 24 into the inside thereof while keeping the opening area of the porthole inlet portion 24e sufficiently large. As a result, a high quality extruded product can be obtained.
  • the passage cross-sectional area of the porthole 24 becomes extremely small as compared with the passage cross-sectional area of the inlet portion 24e of the porthole 24, causing sudden pressure changes when the billet passes through the porthole 24 , whichmay sometimes make it difficult to stablyintroduce the billet into the die.
  • the aforementioned opening angle ⁇ w is too small, the opening area of the inlet portion 24e cannot be secured, causing excessively large pressure (extrusion load) of the billet against the die, which in turn may sometime make it difficult to smoothly perform the extrusion processing.
  • the porthole 5 itself becomes large. This increases the void rate of the die by the portholes 24 , resulting in deteriorated die strength. Therefore, it is not preferable.
  • This extrusion die 10 according to the third embodiment is L5 also set to the same extruder shown in Figs. 25 to 27 used in the second embodiment to perform the extrusion.
  • Figs. 34 to 38 show an extrusion die 10 according to a fourth embodiment of this invention. As shown in these figures, the 5 extrusion die 10 of this fourth embodiment is different from the extrusion dies 10 of the second and third embodiments in the configuration (structure) of the porthole 24.
  • a pair of portholes 24 and 24 are formed so as to be located at thickness both sides of the flat extrusion hole 11.
  • the inlet portion 24e of this porthole 24 is formed into an approximately trapezoidal configuration as seen from the upstream side of the axial direction, in the same manner as in the second embodiment .
  • an outer chamfered portion 242 is formed by cutting out the corner portion between the outer side surface 24b of the inner peripheral surface and the pressure receiving surface 22.
  • the inclination angle of the outer chamfered portion 242 with respect to the axis Al is defined as TM ⁇ 2" as shown in Fig. 38, it is preferable to set the inclination angle Qi to 25 to 50° , more preferably 30 to 45° .
  • the chamfered ratio (L2/Lb) is preferably set to 0.2/1 to 0.9/1, more preferably set to 0.4/1 to 0.8/1.
  • the extrusion load can be 5 suppressedby the increased opening area of the porthole inlet portion 24e, and therefore a billet can be stably introduced into the inside of the die from the inlet portion 24e of the porthole 24.
  • theotherstructure is substantially 0 the same as that of the second and third embodiments.
  • the extrusion can be performedin the samemanner as mentionedabove, andthe same functions and effects can be attained.
  • 5 ⁇ Fifth embodiment> Eigs. 39 to 43 show an extrusion die 10 according to a fifth embodiment of this invention. As shown in these figures, in this extrusion die 10 of the fifth embodiment, at both sides of the peripheral wall of the pressure receiving portion 21, a pair of 5 portholes 24 and 24 are formed. Furthermore, in this porthole 24, an inner chamfered portion 241 is formed by cutting out the corner portion between the inner side surface 24a of the inner peripheral surface and the pressure receiving surface 22.
  • the chamfered ratio (Ll/La) is preferably set to 0.2/1 to 0.9/1,
  • the extrusion load can be 5 suppressedby the increased opening area of the porthole inlet portion
  • the inner side surface 24a of the inner peripheral surface of the porthole 24 and the outer side surface 24b thereof are arranged approximately in parallel with each other, so that the inclination angle ⁇ a of the inner side surface 24a with respect to the axis Al and the inclination angle ⁇ h of the outer side surface 24b with respect to the axis Al are approximately the same.
  • the other structure is substantially the same as that of the second and third embodiments. Also, in this extrusion die 10 of the fifth embodiment, the extrusion can be performedin the samemanner as mentionedabove, andthe same functions and effects can be attained.
  • the pressure receiving portion 21 is formed into ahemisphere convex configuration (hemisphere convex surface) .
  • the configuration of the pressure receiving portion 21 is not limited to the above .
  • the pressure receiving surface 22 can be formed into a polyhedral configuration constituted by a number of side surfaces . That is , the pressure receiving surface 22 can be formed into, for example, a polyhedral configuration, such as, e.g. , a pyramid configuration in which a plurality of side surfaces are arranged in the circumferential direction, or a polyhedral configuration in which a plurality of side surfaces are arranged in the radial direction.
  • each side surface constituting the pressure receiving surface 22 can be, for example, a flat surface or a curved surface.
  • the pressure receiving portion 21 can be formed into a laterally elongated configuration longer in the lengthwise direction than in the crosswise direction, the lengthwise direction and the crosswise direction being perpendicular to the axial direction.
  • the pressure receiving portion 21 can be formed into a laterally elongated elliptical configuration as seen from the axial upstream side or a laterally elongated oval configuration as seen from the axial upstream side.
  • the pressure receiving portion 21 canbe formedinto aconfigurationwithan axial directional dimension longer than the radial directional dimensionperpendicular to the axial direction, e.g., a semi-elliptical configuration.
  • the die case 2O is integrallyformed.
  • the die case 20 can be divided into two ormoreparts .
  • the die case 20 canbe constituted by two members, i.e., a male die case for holding the male die 30 and a female die case for holding the female die 40.
  • the male die 30, the female die 40, the flow control plate 50 are formed separately from the die case 20.
  • the present invention is not limited to the above, and at least one of the male die 30 , the female die 40 , and the flow control plate 50 is integrally formed together with the die case 20. Furthermore, in the present invention, the flow control plate 50 can be omitted as needed.
  • the explanation was directed to the die for extruding a flat multi-passage tubular member.
  • the configuration of the extruded product is not specifically limited.
  • it can be constituted such that a male die is provided with a mandrel round in cross-section and a female die is provided with a die hole round in cross-section so that a circular ring shaped extrusion hole is formed between the mandrel and the die hole to extrude a round tubular member.
  • the explanation was directed to the case in which two portholes 24 are formed at both sides of the axis Al .
  • the present invention is not limited to the above, and allows forming of one porthole 24 or three or more portholes 24.
  • the base portion 25 is provided at the front end portion of the die case 20. In the present invention, however, it is not always required to provide the base portion 25.
  • the explanation was directed to the case in which only a single extrusion die is set in a container.
  • the present invention is not limited to the above .
  • the extruder according to the present invention it can be configured such that two or more extrusion dies are set in a container.
  • both the outer chamferedportion 242 and the inner chamfered portion 241 are formed so that the opening area of the porthole inlet portion 24e is larger than the passage cross-sectional area of the inside of the porthole 24.
  • the rear end face (basal end face) of the male die 30 is formed as a part of the convex surface (spherical surface) corresponding to the billet pressure receiving surface 22 of the pressure receiving portion 21 and that the rear end face of the male die 30 and the billet receiving surface 22 constitute a prescribed smooth convex surface (spherical surface).
  • the configuration of the rear end face (basal end face) of the male die 30 is not limited to the above, and can be, for example, formed into the following configuration.
  • the rear end face of the male die 30 in cases where the surface area of the rear end face of the male die 30 is, for example, 1/3 or less of the surface area of the billet pressure receiving surface 22 of the die 10, the rear end face of the male die 30 can be constituted by a part of a columnar external peripheral surface in which the rear end face is circular corresponding to the billet pressure receiving surface 22 in the width direction (longitudinal direction) and straight in the thickness direction (direction perpendicular to the longitudinal direction) because of the following reasons .
  • an extrusion die 10 corresponding to the second embodiment was prepared.
  • the pressure receiving portion 21 of the die case 20 of the die 10 had two portholes 24 formed at both thickness direction sides of the extrusion hole 11.
  • the inclination angle ⁇ a of the inner side surface 24a was adjusted to 10°
  • the inclination angle ⁇ b of the outer side surface 24b was adjusted to 25° . Accordingly, this porthole inlet portion 24e is enlarged in the thickness direction . 5
  • the width dimension of each porthole 24 is set to be constant from the inlet portion 24e toward the inside of the die.
  • the ratio (2xSb/Sa) of the total plan state opening area Sb of the porthole inlet portions 24e to the plan state .0 area Sa of the pressure receiving portion 21 was set to 0.70 (the area ration per porthole 24 was 0.35).
  • the billet pressure receiving surface 22 was formed into a 1/2 spherical configuration (convex spherical configuration) having L5 a radius of 30 mm.
  • the male die 30 was adjusted to 2.0 mm in height of mandrel 31, 19.2 mm in width of mandrel 31, 1.2 mm in height of passage forming protruded portion 33, 0.6 mm in width of passage forming protruded portion 33 , and 0.2 mm in width of partition forming groove 32.
  • the female die 40 was adjusted to 1.7 mm in height of die hole 41 and 20.0 mm in width of die hole 41.
  • the extrusion die 10 was set to 5 an extruder similar to the extruder shown in the second embodiment and extrusion was performed to produce a flat multi-passage tubular member.60 (heat exchanging tubular member) as shown in Figs. 28 and 29.
  • Example 17 As shown in Table 3, an extrusion die 10 corresponding to the third embodiment (see Figs. 30 to 33) was prepared. That is, the porthole 24 of the pressure receiving portion 21 was formed such that the width thereof gradually decreased from the inlet portion 24e toward the inside thereof. The width directional opening angle ⁇ w was set to 15° . Accordingly, this porthole inlet portion 24e was enlarged in the width direction. The inner side surface 24a of the porthole inner peripheral surface and the outer side surface 24b thereof were set to 10° in inclination angle ⁇ a. and ⁇ b and arranged in parallel with each other.
  • the ratio (2xSb/Sa) of the total plan state opening areas Sb of the porthole inlet portions 24e to the plan state area Sa of the pressure receiving portion 21 was set to 0.60 (the area ration per porthole 24 was 0.30).
  • An extrusion die 10 same as that of Example 16 other than the aforementioned structure was prepared, and evaluated in the same manner as mentioned above by performing extrusion processing.
  • Example 18 As shown in Table 3, an extrusion die 10 corresponding to the fourth embodiment (see Figs. 34 to 38) was prepared. That is, the inner side surface 24a and outer side surface 24b of the porthole inner peripheral surface of the pressure receiving portion 21 were set to 10° in inclination angles ⁇ a and ⁇ b , and arranged in parallel with each other. Furthermore, at the outer side of the inlet portion 24e of the porthole 24, a chamfered portion 242 was formed. This outer chamfered portion 242 was set to 45° in inclination angle and 5 mm in length, and the chamfered rate (L2/Lb) of this chamfered portion 242 was 0.23/1. Therefore, the porthole inlet portion 24e was enlarged in the thickness direction.
  • the width dimension of the porthole 24 was set to be constant from the inlet portion 24e toward the inside of the die.
  • the ratio (2xSb/Sa) of the total plan state opening area Sb of the porthole inlet portions 24e to the plan state area Sa of the pressure receiving portion 21 was set to 0.76 (the area ration per porthole 24 was 0.38).
  • An extrusion die 10 same as that of Example 16 other than the aforementioned structure was prepared, and evaluated in the same manner as mentioned above by performing extrusion processing.
  • an extrusion die 10 corresponding to the fifth embodiment was prepared. That is, the inner side surface 24a and outer side surface 24b of the porthole inner peripheral surface of the pressure receiving portion 21 were set to 10° in inclination angles ⁇ a and 6>b, and arranged in parallel
  • a chamfered portion 241 was formed at the inner side of the inlet portion 24e of the porthole 24.
  • This inner chamfered portion 241 was set to 0° in inclination angle (parallel to the axis Al) and 10 mm in length Ll, and the chamfered rate (Ll/La) of this chamfered portion 241 was 0.35/1. Therefore,
  • the width dimension of the porthole 24 was set to be constant from the inlet portion 24e toward the inside of the 0 die .
  • the ratio (2xSb/Sa) of the total plan state opening area Sb of the porthole inlet portions 24e to the plan state area Sa of the pressure receiving portion 21 was set to 0.60 (the 5 area ration per porthole 24 was 0.30).
  • An extrusion die 10 same as that of Example 16 other than the aforementioned structure was prepared, and evaluated in the same manner as mentioned above by performing extrusion processing.
  • the pressure receiving portion 21 was formed into a semispherical configuration having a radius of 30 mm and a height (axial length) 15 mm.
  • the inner side surface and outer side surface of the porthole inner peripheral surface of the pressure receiving portion 21 were set to 10° in inclination angles ⁇ a and ⁇ b, and arranged in parallel with each other, and the width dimension of the porthole 24 was set to be constant from the inlet portion 24e toward the inside of the die. Accordingly, the porthole inlet portion 24e was not enlarged.
  • the ratio (2xSb/Sa) of the total plan state opening area Sb of the porthole inlet portions 24e to the plan state area Sa of the pressure receiving portion 21 was set to 0.30 (the area ration per porthole 24 was 0.15).
  • a bridge-type extrusion die having a radius of 30 mm and a height (extrusion direction length) of 50 mm in which the pressure receiving surface was finished into a flat surface perpendicularly intersecting with the extrusion direction was prepared.
  • the inclination angle of the metallic material introduction direction was essentially set to 0° .
  • the other structure was the same as the aforementioned embodiments.
  • This extrusion die 10 was set to an extruder in the same manner as mentioned above to produce an extruded product, and evaluated in the same manner as mentioned above.
  • an extrusion die 10 corresponding to the second example was prepared.
  • the pressure receiving portion 21 of the die case 20 of the die 10 had two portholes 24 formed at both thickness direction sides of the extrusion hole 11.
  • the inclination angle ⁇ a of the inner side surface 24a was adjusted to 10°
  • the inclination angle ⁇ b of the outer side surface 24b was adjusted to 25° .
  • the width dimension of each porthole 24 is set to be constant from the inlet portion 24e toward the inside of the die.
  • the ratio (2xSb/Sa) of the plan state opening area Sb of the porthole inlet portions 24e to the plan state area Sa of the pressure receiving portion 21 was set to 0.70 (the area ration per porthole 24 was 0.35).
  • the billet pressure receiving surface 22 was formed into a 1/8 convex spherical surface (convex spherical configuration) having a radius of 45.4 mm.
  • the male die 30 was adjusted to 60 mm in diameter.
  • the male die 30 adjusted to 2.0 mm in height (thickness) of mandrel 31, 19.2 mm in width of mandrel 31, 1.2 mm in height of
  • the female die 40 adjusted to 1.7 mm in height of die hole .0 41 and 20.0 mm in width of die hole 41 was used.
  • the extrusion die 10 was set to an extruder similar to the extruder shown in the second embodiment and extrusion was performed to produce a flat multi-passage tubular
  • L5 member 60 heat exchanging tubular member
  • a flat multi-passage hollow member 60 was produced by performing extrusion in the. same manner as mentioned above.
  • Example 20 5 die of Example 20 except that the billet pressure receiving surface 22 was constituted by a convex spherical surface of a 1/3 sphere and the spherical diameter was set to 32.0 mm was prepared and set to an extruder similar to the extruder as mentioned above.
  • a flat multi-passage hollow member 60 was produced by performing extrusion
  • a flat multi-passage hollow member 60 was produced by performing extrusion in the same manner as mentioned above. 0
  • a flat multi-passage hollow member 60 was produced by performing extrusion in the same manner as mentioned above.
  • a flat .0 multi-passage hollow member 60 was produced by performing extrusion in the same manner as mentioned above.
  • the die production cost could be kept low while keeping sufficiently long die life, which was an excellent result.
  • Example 24 Comparing with the die according to Example 23, in the die in which the billet pressure receiving surface 22 was formed into a convex spherical surface of a 4/6 sphere (Example 24), the die production cost was increased, which was an inferior result among
  • the term "preferably” is non-exclusive andmeans “preferably, but not limited to.”
  • means-plus-function or step-plus-function limitations will only be employed where for a specific claim limitation all of the following conditions are present in that limitation: a) "means for” or “step for” is expressly recited; b) a corresponding function is expressly recited; and c) structure, material or acts that support that structure are not recited.
  • the terminology "present invention” or “invention” may be used as a reference to one or more aspect within the present disclosure.
  • the extrusion die for a metallic material according to the present invention can be applied to manufacture an extruded product such as a hollow tube, for example, a heat exchanging tube for use in car air conditioners, evaporators, or household hot-water supply equipments .

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  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)

Abstract

Dans certaines modes de réalisation préférés, l'invention propose une filière d'extrusion 10 de matériau métallique qui comprend un boîtier de filière 20 doté d'une partie 21 de reprise de pression qui présente une surface 22 de reprise de la pression du matériau métallique tournée vers l'arrière par rapport à la direction d'extrusion, une filière mâle 30 disposée dans le boîtier de filière 20 et une filière femelle 40 disposée dans le boîtier de filière 20. La partie 21 de reprise de pression a une configuration convexe qui déborde vers l'arrière et un orifice de passage 24 qui permet d'introduire le matériau métallique est prévu dans la périphérie extérieure de la partie 21 de reprise de pression. Le rapport entre la superficie Sb de l'ouverture à l'état plat de la partie 24e d'entrée dans l'orifice de passage et la superficie Sa à l'état plat de la partie 21 de reprise de pression est réglé entre 0,15 et 0,80. La filière d'extrusion est configurée de telle sorte que le matériau métallique repoussé contre la surface 22 de reprise de la pression du matériau métallique est introduit dans le boîtier de filière 20 par l'orifice de passage 24 et traverse le trou d'extrusion 11.
EP07829274A 2006-10-03 2007-10-01 Filière d'extrusion de matériau métallique Withdrawn EP2049277A4 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2006271726 2006-10-03
JP2006275031 2006-10-06
US88704407P 2007-01-29 2007-01-29
JP2007057124A JP5053664B2 (ja) 2006-10-06 2007-03-07 金属材料の押出成形用ダイス
JP2007056953A JP5053663B2 (ja) 2006-10-03 2007-03-07 金属材料の押出成形用ダイス
PCT/JP2007/069536 WO2008044620A1 (fr) 2006-10-03 2007-10-01 filière d'extrusion de matériau métallique

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EP2049277A4 EP2049277A4 (fr) 2010-03-17

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WO2008044620A1 (fr) 2008-04-17
EP2049277A4 (fr) 2010-03-17

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