JP2012024819A - Extruding tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extruding tool that prevents oxidation of an extrusion material and also prevents changes in form and surface state of the extrusion material associated with rapid cooling of the extrusion material.SOLUTION: The extruding tool 15 includes an extrusion die 1 having a molding hole 3. An inert gas feeding flow passage 7 for feeding an inert gas G to an extrusion material-passing space 81 provided downstream of the molding hole 3, is formed in the extrusion die 1.

Description

  The present invention relates to an extrusion tool used when an extruded material is produced by extrusion, and a method for producing the extruded material.

  In the present specification and claims, upstream and downstream mean upstream and downstream with respect to the extrusion direction, respectively.

  When an aluminum extrusion material is manufactured by extrusion using an extrusion tool equipped with an extrusion die, an inert gas is introduced from the molding hole to prevent oxidation of the extruded material extruded from the molding hole of the extrusion die. Is also supplied to the extruded material passage space on the downstream side (see, for example, Patent Document 1).

  In this extrusion process, downstream members such as a bolster and a backer are disposed on the downstream side of the extrusion die, and the extrusion die is set at a temperature higher than the temperature of the downstream member.

Japanese Patent No. 2916647

  However, in the conventional method described above, the temperature of the inert gas supplied to the extruded material passage space is much lower than the temperature of the extruded material (for example, about 400 ° C.). Therefore, there has been a problem that the extruded material is rapidly cooled by an inert gas and the shape and surface state of the extruded material are changed.

  The present invention has been made in view of the above-described technical background, and its purpose is to prevent the extrusion material from being oxidized, and to further change the shape and surface state of the extrusion material due to rapid cooling of the extrusion material. An object of the present invention is to provide an extrusion tool that can be prevented and a method for producing an extruded material using the same.

  The present invention provides the following means.

  [1] An extrusion tool characterized in that an inert gas supply channel for supplying an inert gas to an extrusion material passage space downstream of the molding hole is formed in an extrusion die having a molding hole.

[2] A downstream member disposed on the downstream side of the extrusion die in contact with the downstream end surface of the extrusion die,
On the downstream end face of the extrusion die, a groove for forming an inert gas supply channel is formed,
2. The extrusion tool according to claim 1, wherein the inert gas supply channel is formed in the extrusion die by closing the opening of the groove with the downstream member.

  [3] The extrusion tool according to item 2, wherein the groove is formed on the downstream end face of the extrusion die by bending with respect to a direction from the outer peripheral side of the extrusion die toward the extruded material passage space.

  [4] The extrusion tool according to the above item 2 or 3, wherein the groove is formed on the downstream end face of the extrusion die so as to be bent so as to surround the extrusion material passage space.

  [5] The extrusion tool according to item 4, wherein the groove is formed to be bent so as to surround one or more rounds around the extruded material passage space.

[6] The extrusion tool is used when producing an extruded material made of aluminum or an alloy thereof.
The extrusion tool according to any one of the preceding items 1 to 5, wherein an inert gas having a temperature of 150 ° C. or higher and 660 ° C. or lower is supplied to the extruded material passage space using an extrusion die having a temperature of 150 ° C. or higher. .

[7] A method for producing an extruded material, in which an extruded material is produced by extrusion using an extrusion tool,
As an extrusion tool, using the extrusion tool according to any one of the preceding items 1 to 6,
An extrusion material manufacturing method, wherein an extrusion material is manufactured by an extrusion process in a state in which an inert gas is supplied to an extrusion material passage space of the extrusion tool via an inert gas supply channel.

  [8] Extrusion according to item 7 above, wherein the inert gas pressure in the inert gas supply channel is made larger than the inert gas pressure in the extruded material passage space to supply the inert gas to the extruded material passage space. A method of manufacturing the material.

  The present invention has the following effects.

  According to the extrusion tool of the preceding item [1], the inert gas supply flow path for supplying the inert gas to the extruded material passage space downstream of the forming hole is formed in the extrusion die having the forming hole. Since the inert gas flows through the inert gas supply flow path and is supplied to the extruded material passage space, oxidation of the extruded material can be prevented. Further, the inert gas is heated by the extrusion die while flowing through the inert gas supply flow path, and the temperature rises. Therefore, changes in the shape and surface state of the extruded material accompanying rapid cooling of the extruded material can be prevented.

  Here, the inert gas supply flow path is not formed in a downstream member such as a bolster or a backer disposed on the downstream side of the extrusion die, but is set at a temperature higher than the temperature of the downstream member during the extrusion process. Since the extrusion die is formed, the temperature of the inert gas can be rapidly increased. Therefore, it is possible to reliably supply a higher temperature inert gas to the extruded material passage space, so that the shape and surface of the extruded material are compared with the case where the inert gas supply channel is formed in the downstream member. A change in state can be prevented more reliably.

  According to the extrusion tool of the preceding item [2], a groove for forming an inert gas supply channel is formed on the downstream end face of the extrusion die, and the opening of the groove is closed by the downstream member. Since the inert gas supply channel is formed in the extrusion die, the inert gas supply channel can be easily formed in the extrusion die.

  According to the extrusion tool of the preceding item [3], the groove is formed in the downstream end face of the extrusion die by being bent in the direction from the outer peripheral side of the extrusion die to the extruded material passage space. The gas supply channel can be lengthened. As a result, the heating time for the inert gas is lengthened, so that the temperature of the inert gas can be significantly increased, and changes in the shape and surface state of the extruded material can be more reliably prevented.

  According to the extrusion tool of the above item [4], the groove is formed on the downstream end face of the extrusion die so as to surround the extruded material passage space, and therefore has the following effects.

  Since the groove is bent so as to surround the extruded material passage space, that is, bent in the direction from the outer peripheral side of the extrusion die to the extruded material passage space, the effect of the extrusion tool of the preceding item [3] Has the same effect as. Furthermore, generally, when the inert gas at room temperature flows through the inert gas supply channel, the heat of the extrusion die is locally deprived by the inert gas at the position of the inert gas supply channel, and the temperature distribution of the extrusion die is increased. However, according to the extrusion tool of [4], the groove is bent around the extruded material passage space. Therefore, the temperature distribution of the extrusion die is as much as possible in the circumferential direction around the extruded material passage space. It can be made uniform. As a result, the temperature distribution in the circumferential direction of the extruded material passing through the extruded material passage space can be made uniform, so that the shape and surface state of the extruded material can be favorably maintained.

  According to the extrusion tool of the preceding item [5], since the groove is formed to be bent so as to surround one or more rounds around the extruded material passage space, the heating time to the inert gas can be further increased. In addition, the temperature distribution of the extrusion die can be made more uniform in the circumferential direction centering on the extruded material passage space. Therefore, the effect of the previous item [3] can be obtained with certainty.

  The extrusion tool of the preceding item [6] is configured so that an inert gas of 150 ° C. or higher and 660 ° C. or lower is supplied to the extruded material passage space using an extrusion die of 150 ° C. or higher. It is possible to reliably prevent changes in the shape and surface state of the extruded material made of the alloy.

  According to the method for producing an extruded material of item [7], changes in the shape and surface state of the extruded material accompanying rapid cooling of the extruded material can be prevented.

  In the method for producing an extruded material according to [8], the inert gas pressure in the inert gas supply channel is made larger than the inert gas pressure in the extruded material passage space to supply the inert gas to the extruded material passage space. By doing so, the supply amount of the inert gas can be controlled by the pressure. Therefore, the effect of the previous item [7] can be obtained with certainty.

FIG. 1 is a cross-sectional view showing an extrusion apparatus equipped with an extrusion tool according to an embodiment of the present invention in the middle of manufacturing a semi-hollow profile as an extruded material. FIG. 2 is a cross-sectional view of the extrusion tool. FIG. 3 is an exploded perspective view of the extrusion tool. FIG. 4 is a front view of the same extrusion tool as viewed from the upstream side. FIG. 5 is a rear view taken along the line XX in FIG. 2 as seen from the downstream side of the die body of the extrusion die of the same extrusion tool. FIG. 6 is a cross-sectional view of a semi-hollow profile as an extruded material manufactured using the extrusion processing apparatus. FIG. 7A is a rear view corresponding to FIG. 5, as seen from the downstream side, of the die body of the extrusion die of the extrusion tool according to the first modification of the embodiment of the present invention. FIG. 7B is a rear view corresponding to FIG. 5 when the die body of the extrusion die of the extrusion tool according to the second modification of the embodiment of the present invention is viewed from the downstream side. FIG. 7C is a rear view corresponding to FIG. 5 when the die body of the extrusion die of the extrusion tool according to the third modification of the embodiment of the present invention is viewed from the downstream side. FIG. 7D is a rear view corresponding to FIG. 5 when the die body of the extrusion die of the extrusion tool according to the fourth modification of the embodiment of the present invention is viewed from the downstream side. FIG. 7E is a rear view corresponding to FIG. 5, as seen from the downstream side, of the die body of the extrusion die of the extrusion tool according to the fifth modification of the embodiment of the present invention.

  Next, several embodiments of the present invention will be described below with reference to the drawings.

  In FIG. 1, 15 is an extrusion tool according to an embodiment of the present invention, and 10 is an extrusion apparatus provided with an extrusion tool 15. As shown in the figure, this extrusion processing apparatus 10 is of a direct extrusion type, and includes a container 11, a stem 12, and the like in addition to the extrusion tool 15 of this embodiment.

  The extrusion material 9 manufactured using this extrusion processing apparatus 10 is a semi-hollow shape material as shown in FIG. Hereinafter, the extruded material 9 is referred to as a semi-hollow shape material 9.

  The semi-hollow shape member 9 has a lip groove shape (lip channel shape) and is formed in a substantially C-shaped cross-sectional shape having a high tong ratio.

  The material of the semi-hollow shape member 9 is a metal, and in this embodiment, aluminum (including an alloy thereof, the same applies hereinafter).

  This semi-hollow shape member 9 is provided with a tong portion (void portion) 92 provided on the inner side and extending in the length direction (extrusion direction E), and a slit-like tong opening provided on the peripheral wall and extending in the length direction. Part (peripheral wall opening part) 93, and the tongue part 92 is opened to the outside through the tongue opening part 93.

  As shown in FIGS. 1 to 3, the extrusion tool 15 of this embodiment includes an extrusion die 1 and a downstream member 8 disposed on the downstream side of the extrusion die 1. The downstream member 8 is, for example, a bolster.

  The extrusion die 1 is divided into a die body 2 disposed on the downstream side with respect to the extrusion direction E and a hole plate 5 disposed on the upstream side. As will be described in detail later, the hole plate 5 does not have a bearing portion and does not function as a die (male), but for convenience, the die body 2 is referred to as a female die and the hole plate 5 is referred to as a male die. There is also. The die body 2 and the hole plate 5 are made of die steel such as SKD61 and SKD11, or ceramic, for example.

  As shown in FIG. 2, the die body 2 of the extrusion die 1 has a flat end whose upstream end surface 2 a is arranged perpendicular to the extrusion direction E and whose downstream end surface 2 b is perpendicular to the extrusion direction E. Formed on the surface. Further, as shown in FIGS. 2 and 3, the die body 2 is provided with a forming hole 3 for forming the semi-hollow shape member 9 extending in the extrusion direction E from the upstream end surface 2 a of the die body 2, as shown in FIGS. A back relief hole 25 communicating with the molding hole 3 and wider than the molding hole 3 is provided on the downstream side of the molding hole 3 so as to extend in the extrusion direction E to the downstream end face 2 b of the die body 2. The cross-sectional shape of the molding hole 3 is formed in a substantially C shape having a shape corresponding to the cross-sectional shape of the semi-hollow shape 9 to be manufactured. Both inner side surfaces of the back escape hole 25 are inclined outward with respect to the extrusion direction E. The downstream opening of the back relief hole 25 is formed at a substantially central portion of the downstream end surface 2b of the die body 2 (see FIG. 5).

  The downstream member 8 is disposed in contact with the downstream end surface 2b of the die body 2 of the extrusion die 1, and is made of, for example, die steel such as SKD61 and SKD11, or ceramic. The upstream end surface 8 a of the downstream member 8 is formed as a flat surface perpendicular to the extrusion direction E. Accordingly, the upstream end surface 8 a of the downstream member 8 abuts on the downstream end surface 2 b of the die body 2 in a surface contact state. Furthermore, the diameter of the upstream end surface 8 a of the downstream member 8 is set to be approximately equal to the diameter of the downstream end surface 2 b of the die body 2.

  A through hole 80 having a circular cross section that communicates with the back escape hole 25 of the die body 2 and surrounds the downstream opening of the back escape hole 25 with an inner peripheral surface is provided in the extrusion direction E at a substantially central portion of the downstream member 8. It is provided penetrating along.

  In the present embodiment, the extruded material passage space 81 through which the semi-hollow shape member 9 extruded from the molding hole 3 passes is constituted by the back escape hole 25 of the die body 2 and the through hole 80 of the downstream member 8. .

  Further, as shown in FIGS. 2 and 5, the downstream end surface 2b of the die body 2 of the extrusion die 1 has an inert gas in the extruded material passage space 81 (specifically, the position of the downstream opening in the back escape hole 25). A groove 7a for forming an inert gas supply channel for supplying G is formed. The cross-sectional shape of the groove 7a is substantially U-shaped. The upstream end surface 8a of the downstream member 8 is disposed in contact with the downstream end surface 2b of the die body 2 in a surface contact state, so that the opening of the groove 7a is airtight at the upstream end surface of the downstream member 8. Accordingly, an inert gas supply channel 7 having a rectangular cross section is formed in the die body 2 of the extrusion die 1.

  As shown in FIG. 5, the groove 7a is formed in the downstream end surface 2b of the die body 2 by bending it so as to surround one or more rounds around the downstream opening (that is, the extruded material passage space 81) of the back escape hole 25. Has been. Therefore, the groove 7a is bent with respect to the direction from the outer peripheral side of the die body 2 toward the extruded material passage space 81 (that is, the radial direction of the die body 2). In the present embodiment, the groove 7a is bent in a square spiral shape that surrounds the downstream opening of the back escape hole 25 in a square shape in detail.

  Further, the inlet 7x of the groove 7a (the inlet of the inert gas supply channel 7) is formed on the outer peripheral surface of the die body 2 so as to open outward in the radial direction of the die body 2. The outlet 7y of the groove 7a (the outlet of the inert gas supply channel 7) is formed to open on the inner side surface of the back escape hole 25 toward the inside of the downstream opening of the back escape hole 25.

  An inert gas introduction means 70 for introducing the inert gas G into the groove 7a (inert gas supply flow path 7) is connected to the inlet 7x of the groove 7a. The inert gas introduction means 70 includes a tank filled with an inert gas G in a high pressure state, an introduction pipe for introducing the inert gas G in the tank into the inlet 7x of the groove 7a, a valve for adjusting the amount of inert gas introduced, and the like. The inert gas G is jetted into the inlet 7x of the groove 7a through the introduction pipe and the valve with the pressure of the inert gas G filled in the tank, so that the inert gas G is introduced into the groove 7a. It is configured to be introduced.

  The inert gas G is for preventing oxidation or the like of the semi-hollow shape member 9. Here, in the present invention, the inert gas G includes an inert gas in the periodic table such as argon, helium, and neon, and in addition, a gas inert to the semi-hollow shape member 9 such as nitrogen gas, And a mixed gas thereof.

  Furthermore, the extrusion tool 15 is configured such that an inert gas G of 150 ° C. or higher is supplied to the extruded material passage space 81 using the extrusion die 1 of 150 ° C. or higher. Specifically, in this embodiment, the length of the inert gas supply flow path 7 formed in the extrusion die 1 is set so that the inert gas G of 150 ° C. or more and 660 ° C. or less is supplied to the extruded material passage space 81. At least one of the cross-sectional area and the flow rate of the inert gas G is set. That is, when the temperature of the inert gas G supplied to the extruded material passage space 81 is increased, the length of the inert gas supply channel 7 is increased, or the sectional area of the inert gas supply channel 7 is increased. The flow rate of the inert gas G flowing through the inert gas supply channel 7 is decreased. By carrying out like this, the temperature of the inert gas G can be set to 150 degreeC or more. The upper limit of the temperature of the inert gas G supplied to the extruded material passage space 81 is set to 660 ° C. or less, so that the temperature of the inert gas G does not exceed the melting point 660 ° C. of aluminum. The upper limit of the temperature of the extrusion die 1 can be variously set, but is usually 500 ° C.

  Furthermore, as shown in FIG. 2, the die body 2 is such that all bearing portions such as the inner peripheral bearing surface 31 and the outer peripheral bearing surface 32 constituting the molding hole 3 are formed on the die main body 2. It can also be understood as a solid die. The inner peripheral bearing surface 31 is for forming the inner peripheral surface of the semi-hollow shape member 9, and the outer peripheral side bearing surface 32 is for forming the outer peripheral surface of the semi-hollow shape member 9.

  On the radially inner side of the molding hole 3 of the die body 2, a tongue portion molding portion 22 for molding the tongue portion 92 of the semi-hollow shape member 9 is disposed. The tongue opening portion 93 for forming the tongue opening portion 93 is integrally connected to the outer peripheral portion 21 of the die body 2 (see FIG. 3). Therefore, the tongue part molding part 22 is supported in a cantilever manner by the die body outer peripheral part 21 via the tongue opening molding part 23 as a cantilever support part.

  Further, as shown in FIG. 2, a fitting convex edge 29 protruding upstream is continuously provided in the circumferential direction (direction around the axis) on the outer peripheral edge of the upstream end face (front face) 2 a of the die body 2. Is formed.

  On the other hand, the hall plate 5 has a weld chamber 51 inside the downstream side (back side), and the weld chamber 51 is opened to the downstream side. Therefore, the weld chamber 51 is disposed in communication with the molding hole 3 on the upstream side of the molding hole 3. Further, the hole plate 5 is formed with a plurality of metal holes 55 having an upstream end opened to the upstream end surface (front) of the hole plate 5 and a downstream end opened to the weld chamber 51. The cross-sectional shape (front view shape) of the metal hole 55 is formed in a substantially 1/4 circle, and four metal holes 55 are formed at equal intervals in the circumferential direction.

  As shown in FIGS. 3 and 4, the region between the four metal holes 55 is configured as a bridge 53, and two metal holes 55 adjacent to each other are partitioned by the bridge 53. In other words, the bridge 53 is disposed between the two metal holes 55 adjacent to each other in the circumferential direction.

  A portion surrounded by the four metal holes 55 in the hole plate 5 is configured as an axial center portion 50 disposed along the axial center of the extrusion die 1. As shown in FIG. 2, the downstream end of the axial center portion 50 is provided with a protrusion 61 that protrudes in the downstream direction, and the tip (downstream end) of the protrusion 61 is It is formed as a rectangular dummy molding portion 6 in a rear view state. This dummy molding part 6 corresponds to the position of the tongue part molding part 22 of the die body 2, and faces the tongue part molding part 22 upstream of the tongue part molding part 22 in the weld chamber 51. In addition, as will be described in detail later, the tongue portion is formed in a substantially similar shape to the tong portion molding portion 22.

  Here, when the hole plate 5 of the present embodiment provided with the dummy forming portion 6 is compared with a hole plate of a well-known port hole die (holodais), the dummy forming portion 6 of the present embodiment has a well-known hole. Although it is arranged at the same position as the male die (mandrel) on the plate, it does not have a bearing portion (inner peripheral side bearing surface) that determines the product shape of the semi-hollow shape member 9. That is, although this dummy forming part 6 is arranged at the position of the male die, it does not function as a male die and can be regarded as a dummy of the male die.

  Further, as shown in FIG. 4, the dummy forming portion 6 is formed to be slightly smaller than the tongue portion forming portion 22 in a front view state.

  A fitting concave step portion 59 is continuously formed in the circumferential direction corresponding to the fitting convex edge portion 29 of the die body 2 on the outer peripheral edge portion of the downstream end surface (back surface) of the hall plate 5. Yes.

  Then, the die body 2 and the hole plate 5 are combined in such a manner that the fitting convex edge portion 29 of the die body 2 is fitted into the fitting concave step portion 59 of the hole plate 5 having this configuration. The extrusion die 1 of this embodiment is manufactured.

  A gap 20 is formed between the rear surface of the dummy molding portion 6 and the front surface of the tongue portion molding portion 22. Further, the dummy molding part 6 and the tongue part molding part 22 are not mechanically connected and fixed by bolts or screws, etc., and the dummy molding part 6 and the tongue part molding part 22 are not fixed, that is, mutually It is in a free state that is not linked.

  As shown in FIG. 1, in the extrusion apparatus 10 of the present embodiment, a die holder on the downstream side of the container 11 in the extrusion apparatus 10 in a state where the die body 2 of the extrusion die 1 and the hole plate 5 are combined with each other. (Not shown). Further, the downstream side member 8 is disposed on the downstream side of the die body 2, and the downstream side end surface 2b of the die body 2 is disposed in contact with the upstream side end surface 8a of the downstream side member 8 in a surface contact state. The side member 8 is fixed by a fixing member (not shown). In this state, as shown in FIG. 2, the opening of the groove 7 a for forming the inert gas supply channel on the downstream end surface 2 b of the die body 2 is airtightly closed by the upstream end surface 8 a of the downstream member 8. . Thereby, the inert gas supply flow path 7 is formed in the die body 2.

  Extrusion using the extrusion apparatus 10 (a method for producing a semi-hollow profile) is the same as a known extrusion process. That is, the temperature of the die body 2 and the hole plate 5 of the extrusion die 1 is set to 350 to 500 ° C, and the downstream member 8 is set to 300 to 400 ° C. Then, an inert gas (for example, nitrogen gas) G set at room temperature is introduced into the inert gas supply channel 7 from the inlet 7x by the inert gas introduction means 70, whereby the inert gas G is inert. It is supplied to the extruded material passage space 81 (specifically, the position of the downstream opening of the back escape hole 25) through the gas supply flow path 7. The supply amount of the inert gas G is, for example, 1 liter / min to 90 liter / min. At this time, the inert gas pressure in the inert gas supply channel 7 is made larger than the inert gas pressure in the extruded material passage space 81 to supply the inert gas to the extruded material passage space 81. Specifically, the inert gas pressure in the extruded material passage space 81 is set to 0.1 MPa, for example, and the inert gas pressure in the inert gas supply channel 7 is set to 0.11 MPa, for example. By doing so, the supply amount of the inert gas G can be controlled by the pressure. While maintaining this state, an aluminum billet as an extrusion material 91 (molding material) loaded in the container 11 is pushed in the extrusion direction E through the dummy block 13 by the stem 12. Thus, the extruded material 91 is introduced from each metal hole 55, joined and welded (crimped) in the weld chamber 51, and passes through the molding hole 3. As a result, the extruded material 91 is molded to produce the aluminum semi-hollow profile 9 shown in FIG. 6 having a cross-sectional shape corresponding to the molding hole 3. The semi-hollow shape member 9 extruded from the forming hole 3 sequentially passes through the back escape hole 25 of the die body 2 and the through hole 80 of the downstream member 8 as the extruded material passage space 81. At this time, oxidation of the semi-hollow shape member 9 in the high temperature state is prevented by the inert gas G.

  Thus, the extrusion die 1 of the above embodiment has the following advantages.

  Since the die body 2 of the extrusion die 1 is formed with the inert gas supply flow path 7 for supplying the inert gas G to the extruded material passage space 81 downstream of the molding hole 3 of the die body 2, the extrusion process is performed. Sometimes, the inert gas G flows through the inert gas supply flow path 7 and is supplied to the extruded material passage space 81, thereby preventing the semi-hollow profile 9 from being oxidized. Further, the inert gas G is heated by the die body 2 of the extrusion die 1 in the course of flowing through the inert gas supply flow path 7, and its temperature rises. Therefore, it is possible to prevent changes in the shape and surface state of the semi-hollow shape 9 due to the rapid cooling of the semi-hollow shape 9.

  Furthermore, the inert gas supply flow path 7 is not formed in the downstream member 8 but is formed in the die body 2 of the extrusion die 1 set at a temperature higher than the temperature of the downstream member 8. The temperature of the inert gas G can be raised quickly. Therefore, the higher temperature inert gas G can be reliably supplied to the extruded material passage space 81, and as a result, it is semi-hollow compared to the case where the inert gas supply channel 7 is formed in the downstream member 8. Changes in the shape and surface state of the profile 9 can be prevented more reliably.

  Further, a groove 7a for forming an inert gas supply channel is formed on the downstream end face 2b of the die body 2 of the extrusion die 1, and the opening of the groove 7a is closed by the downstream member 8, thereby Since the inert gas supply channel 7 is formed in the die body 2 of the die 1, the inert gas supply channel 7 can be easily formed in the extrusion die 1.

  Further, the groove 7a is formed in the downstream end surface 2b of the die body 2 of the extrusion die 1 so as to be bent in the direction from the outer peripheral side of the extrusion die 1 to the extruded material passage space 81 (see FIG. 5). ), The inert gas supply channel 7 can be lengthened. As a result, the heating time to the inert gas G is lengthened, so that the temperature of the inert gas G can be significantly increased, thereby further reliably preventing changes in the shape and surface state of the semi-hollow profile 9. be able to.

  Furthermore, since the groove 7a is formed in the downstream end surface 2b of the die body 2 of the extrusion die 1 so as to surround the extruded material passage space 81, the following effects are obtained.

  Since the groove 7a is bent so as to surround the extruded material passage space 81, that is, bent in the direction from the outer peripheral side of the extrusion die 1 to the extruded material passage space 81, the same effect as described above is obtained. There is an effect. Further, generally, when the inert gas G at room temperature flows through the inert gas supply flow path 7, the heat of the extrusion die 1 is locally deprived by the inert gas G at the position of the inert gas supply flow path 7. Although the temperature distribution is generated in the die 1, according to the extrusion tool 15 of the present embodiment, the groove 7 a is in the bent state around the extruded material passage space 81. The passage space 81 can be made uniform in the circumferential direction as much as possible. Thereby, the temperature distribution in the circumferential direction of the semi-hollow shape member 9 passing through the extruded material passage space 81 can be made uniform, so that the shape and surface state of the semi-hollow shape member 9 can be favorably maintained. .

  Furthermore, since the groove 7a is bent and formed so as to surround one or more rounds around the extruded material passage space 81, the heating time to the inert gas G can be further increased. The temperature distribution can be made more uniform in the circumferential direction around the extruded material passage space 81. Therefore, the temperature of the inert gas G can be further greatly increased, and the temperature distribution in the circumferential direction of the semi-hollow shape member 9 passing through the extruded material passage space 81 can be further uniformed. Changes in the shape and surface state of the hollow member 9 can be prevented even more reliably.

  Further, the extrusion tool 15 is configured so that an inert gas G of 150 ° C. or more and 660 ° C. or less is supplied to the extruded material passage space 81 using the extrusion die 1 of 150 ° C. or more. It is possible to reliably prevent changes in the shape and surface state of the semi-hollow shape member 9 made of aluminum.

  Moreover, according to the extrusion die 1 of the extrusion tool 15 of the present embodiment, since the dummy molding part 6 is arranged corresponding to the tongue part molding part 22 on the upstream side of the tongue part molding part 22, during the extrusion process, As the extruded material 91 flows on the outer peripheral side of the dummy molded part 6, the extruded material 91 is not pressed against the central part (main part) of the tongue part molded part 22, and the extrusion load acts on the tongue part molded part 22. Is reduced. For this reason, the possibility that the tongue opening molding portion 23 is damaged by the extrusion load can be kept low, and the durability of the extrusion die 1 can be improved.

  Further, in this embodiment, since the dummy molding part 6 is separated from the tongue part molding part 22, the hole plate 5 of the extrusion die 1 is bent by the extrusion load, and the dummy molding part 6 is moved downstream. Even if it is extruded, it is possible to effectively prevent the dummy molding part 6 from being pressed against the tongue part molding part 22. For this reason, a great load is not applied to the tongue part molding part 22, and also from this point, the damage of the tongue part molding part 23 can be surely prevented, thereby further improving the durability of the extrusion die 1. it can.

  Furthermore, in this embodiment, since the dummy molding part 6 is not fixed to the tongue part molding part 22, even if the dummy molding part 6 is displaced by the deflection of the hole plate 5 of the extrusion die 1, Following the displacement, the tongue forming part 22 is not displaced, and the adverse effect due to the displacement of the dummy forming part 6 does not reach the tongue forming part 22. Therefore, damage to the tongue opening molding part 23 can be more reliably prevented, and the durability of the extrusion die 1 can be further reliably improved.

  In the present embodiment, the width dimension of the gap 20 between the dummy molding part 6 and the tongue part molding part 22 is set to be narrower than the width dimension of the molding hole 3. As a result, the extruded material 91 preferentially passes through the molding hole 3 and can surely prevent the extruded material 91 from entering the gap 20 between the dummy molded part 6 and the tongue part molded part 22. . For this reason, it is possible to surely prevent the tong portion molding portion 22 from being adversely affected by the deflection of the hole plate 5 due to the intrusion of the extruded material 91 into the gap 20, for example, the extrusion material 91 bites into the gap 20. Accordingly, the durability of the extrusion die 1 can be improved more reliably.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, FIGS. 7A to 7E show some variations of the inert gas supply flow path forming groove 7a formed on the downstream end surface 2b of the die body 2 of the extrusion die 1 according to the above embodiment. . In these drawings, a case where the cross-sectional shape of the extruded material passage space 81 (that is, the back escape hole 25) is circular is shown.

  In the first modification shown in FIG. 7A, the groove 7 a is formed straight in the direction from the outer peripheral side of the die body 2 of the extrusion die 1 toward the extruded material passage space 81.

  In the second modification shown in FIG. 7B, the two grooves 7a, 7a are formed to be bent so as to surround the extruded material passage space 81 with a phase difference of 180 °.

  In the third modification shown in FIG. 7C, the groove 7 a is formed to be branched into a plurality (two in the same figure) on the way from the outer peripheral side of the extrusion die 1 to the extruded material passage space 81.

  In the fourth modification shown in FIG. 7D, the groove 7a is formed by bending a round spiral around the extruded material passage space 81 so as to surround it round one or more times.

  In the fifth modification shown in FIG. 7E, the groove 7a is formed such that its outlet 7y is tapered.

  In addition, in this invention, you may comprise combining the shape of the groove | channel 7a of the extrusion die 1 of the said embodiment and the said deformation | transformation form.

  Moreover, in the said embodiment, although the downstream member 8 is a bolster, in this invention, you may be a bucker etc. in addition.

  Moreover, in the said embodiment, although the cross-sectional shape of the groove | channel 7a is U shape, in this invention, V shape, circular arc shape, etc. may be sufficient.

  Moreover, in the said embodiment, although the extrusion material 9 is a semi-hollow shape material, in this invention, a hollow material and a solid material may be used in addition.

  In the above embodiment, the weld chamber 51 is provided in the hole plate 5. However, in the present invention, the weld chamber 51 may be provided in the die body 2, or the die body 2 and the hole plate 5. It may be provided across. In other words, in the present invention, the weld chamber 51 may be provided in at least one of the die body 2 and the hole plate 5.

  Moreover, in the said embodiment, although the material of the extrusion material 9, ie, the extrusion material 91, it is desirable that it is aluminum, in this invention, metals other than aluminum may be used in addition to this.

  In the above embodiment, the extrusion die 1 is a die in which the die body 2 and the hole plate 5 are combined, that is, a combination die. However, in the present invention, the extrusion die 1 is not limited to such a combination die. In addition, for example, a die used alone may be used.

  INDUSTRIAL APPLICATION This invention can be utilized for the manufacturing method of the extrusion tool used when manufacturing extruded materials, such as a semi-hollow shape material, by an extrusion process, and an extruded material.

1: Extrusion die 2: Die body 2 b: Downstream end face 3 of the die body 3: Molding hole 5: Hall plate 7: Shield gas supply channel 7 a: Slot for forming shield gas supply channel 8: Downstream member 8 a: Downstream Upstream end surface 81 of the side member: extruded material passage space 9: semi-hollow shape material (extruded material)
10: Extrusion device 15: Extrusion tool

Claims (8)

  An extrusion tool, wherein an inert gas supply channel for supplying an inert gas to an extruded material passage space downstream of the molding hole is formed in an extrusion die having the molding hole. A downstream member disposed on the downstream side of the extrusion die in contact with the downstream end surface of the extrusion die;
On the downstream end face of the extrusion die, a groove for forming an inert gas supply channel is formed,
The extrusion tool according to claim 1, wherein the inert gas supply flow path is formed in the extrusion die by closing the opening of the groove with the downstream member.   The extrusion tool according to claim 2, wherein the groove is formed on the downstream end surface of the extrusion die by bending with respect to a direction from the outer peripheral side of the extrusion die toward the extruded material passage space.   4. The extrusion tool according to claim 2, wherein the groove is formed on the downstream end face of the extrusion die so as to be bent around the extrusion material passage space. 5.   The extrusion tool according to claim 4, wherein the groove is formed to be bent so as to surround one or more rounds around the extruded material passage space. The extrusion tool is used when producing an extruded material made of aluminum or an alloy thereof,
The extrusion according to any one of claims 1 to 5, wherein an inert gas having a temperature of 150 ° C or higher and 660 ° C or lower is supplied to the extruded material passage space using the extrusion die having a temperature of 150 ° C or higher. Processing tool. An extrusion material manufacturing method for manufacturing an extrusion material by extrusion using an extrusion tool,
As an extrusion tool, using the extrusion tool according to any one of claims 1 to 6,
An extrusion material manufacturing method, wherein an extrusion material is manufactured by an extrusion process in a state in which an inert gas is supplied to an extrusion material passage space of the extrusion tool via an inert gas supply channel.   The extruded material according to claim 7, wherein the inert gas pressure in the inert gas supply flow path is made larger than the inert gas pressure in the extruded material passage space to supply the inert gas into the extruded material passage space. Production method.

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