JP2012011430A - Extrusion die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extrusion die that manufactures an extruded material excellent in a surface texture and dimension accuracy.SOLUTION: The extrusion die 1 includes bearing surfaces 31, 32 of a molding hole 3 that molds an extrusion material 8. The bearing surfaces 31, 32 are inclined inward the molding hole 3 relative to the extruding direction E over the whole length thereof.

Description

  The present invention relates to an extrusion die used when an extruded material is produced by an extrusion process, 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.

  The bearing portion provided in the extrusion die is an important part that determines the dimensional accuracy and surface properties of the extruded material.

  For example, Japanese Unexamined Patent Publication No. 2000-237816 (Patent Document 1) discloses an extrusion die in which the surface roughness Rz of the upstream edge portion of the bearing portion measured in the width direction of the molding hole is regulated to 10 μm or less. Yes.

  Further, as shown in FIG. 10A, as the extrusion die 101, the inner peripheral side and the outer peripheral side bearing surfaces 104 and 104 for forming the inner peripheral surface and the outer peripheral surface of the extruded material are respectively formed at the upstream end portions with respect to the extrusion direction E. There is also known one in which an inclined choke portion 104 a is formed inside the molding hole 102. That is, the bearing surface 104 includes a choke portion 104a formed at the upstream end portion thereof, and a straight portion 104b formed in the downstream side of the choke portion 104a and parallel to the extrusion direction E. A back relief hole 106 wider than the molding hole 102 is provided on the downstream side of the molding hole 102 so as to communicate with the molding hole 102.

  According to the extrusion die 101, as shown in FIG. 10B, even when the extrusion die 101 is bent downstream by the extrusion load F during the extrusion process, the choke portion 104a of the bearing surface 104 receives the extrusion material. Can produce a good extruded material.

JP 2000-237816 A

  However, in this extrusion die 101, as the extrusion processing time becomes longer, the corner portion 104c between the choke portion 104a and the straight portion 104b of the bearing surface 104 wears, and as a result, the extrusion line has a die line, There were drawbacks that surface defects such as whistle occurred and the dimensional accuracy of the extruded material was lowered.

  The present invention has been made in view of the above-described technical background, and an object of the present invention is to use an extrusion die capable of producing an extruded material having excellent surface properties and dimensional accuracy over a long period of time, and the extrusion die. Another object of the present invention is to provide a method for producing an extruded material.

  The present invention provides the following means.

  [1] An extrusion die characterized in that the bearing surface of the molding hole for molding the extruded material is inclined inward of the molding hole with respect to the extrusion direction over the entire length region.

[2] The extruded material is a semi-hollow shape material,
The extrusion dies are formed on the upstream side of the forming hole, the tong part forming part for forming the tongue part of the semi-hollow shape material, the tong opening forming part for forming the tong opening part of the semi-hollow shape material, and A weld chamber provided, and a plurality of metal holes penetrating along the extrusion direction from the upstream side to the weld chamber,
The extrusion die according to the preceding item 1, wherein a dummy molding part is provided in the weld chamber so as to correspond to the upstream side of the tongue part molding part.

[3] A die body, and a hole plate provided on the upstream side of the die body,
The die body has the molding hole, the tongue part molding part, and the tongue opening molding part,
The extrusion die according to the preceding item 2, wherein the hole plate has the metal hole.

  [4] The extrusion die according to item 2 or 3, wherein the dummy molding part is in an unfixed state with respect to the tongue part molding part.

  [5] The extrusion die according to any one of the preceding items 2 to 4, wherein an area of the downstream end face of the dummy forming part is set smaller than that of an upstream end face of the tongue forming part.

  [6] In the front view state seen from the upstream side along the extrusion direction, the contour line of the dummy molding part is disposed radially inward from the contour line of the tongue part molding part. An extrusion die according to any one of the above.

  [7] A method for producing an extruded material, wherein the extruded material is produced by extrusion processing using the extrusion die according to any one of 1 to 6 above.

  The present invention has the following effects.

  According to the extrusion die of the preceding item [1], since the bearing surface of the molding hole is inclined inward of the molding hole with respect to the extrusion direction over the entire length region, the extrusion die is bent during the extrusion process. However, the extruded material can be received in the entire length region of the bearing surface. For this reason, it is possible to prevent defects caused by wear of the corner portion between the choke portion and the straight portion of the bearing surface as in the case of conventional extrusion dies, that is, surface defects such as die lines and burrs, and deterioration of dimensional accuracy. Therefore, an extruded material having excellent surface properties and dimensional accuracy can be produced over a long period of time.

  Furthermore, since the bearing surface is inclined inward of the forming hole with respect to the extrusion direction over the entire length region, the bearing surface can be easily formed by, for example, wire cut electric discharge machining.

  In the extrusion die of the preceding item [2], since the dummy molding part is provided corresponding to the upstream side of the tongue part molding part, the extrusion material flows to the outer peripheral side of the dummy molding part during the extrusion process. The material does not press against the main part of the tongue part molding part, and the extrusion load applied to the tongue part molding part is reduced. For this reason, it is possible to suppress the possibility that the tong opening molded portion is damaged by the extrusion load, thereby improving the durability of the extrusion die.

  In the extrusion die of the preceding item [3], since the bearing portion that determines the product shape is concentrated on the die body side, the port hole die composed of a female die (port plate) and a male die (hole plate) combined with each other Compared to such horoders, etc., it is possible to easily and accurately manage the dimensional accuracy and shape of the bearing part, such as adjusting the position between the inner and outer bearing surfaces, making it easy to produce high-quality semi-hollow shapes. It can be manufactured reliably.

  In the extrusion die of the above item [4], even if the extrusion die (hole plate) bends due to the extrusion load and the dummy molded portion is displaced, the adverse effect due to the displacement does not reach the tongue portion molded portion. Thus, the durability of the extrusion die can be further improved.

  With the extrusion dies of [5] and [6], a desired metal flow can be formed, stable extrusion can be performed, and a high-quality semi-hollow shape can be more reliably manufactured.

  According to the method for producing an extruded material of the preceding item [7], an extruded material having excellent surface properties and dimensional accuracy can be produced over a long period of time.

FIG. 1 is a cross-sectional view showing an extrusion processing apparatus equipped with an extrusion die according to an embodiment of the present invention in the middle of manufacturing a semi-hollow profile. FIG. 2 is a cross-sectional view of the extrusion die. FIG. 3 is an enlarged cross-sectional view of the periphery of the dummy forming portion of the extrusion die. FIG. 4 is an exploded perspective view of the extrusion die partially cut away. FIG. 5 is a front view of the same extrusion die as viewed from the upstream side. FIG. 6 is a front view of the die body of the extrusion die as viewed from the upstream side. FIG. 7 is a rear view of the hole plate of the same extrusion die as viewed from the downstream side. FIG. 8A is an enlarged cross-sectional view of the periphery of the forming hole of the die body of the same extrusion die. FIG. 8B is a cross-sectional view corresponding to FIG. 8A during extrusion. FIG. 9 is a cross-sectional view of a semi-hollow shape member manufactured using an extrusion processing apparatus equipped with the same extrusion die. FIG. 10A is an enlarged cross-sectional view of the periphery of a forming hole of a conventional extrusion die. FIG. 10B is a cross-sectional view corresponding to FIG. 10A during extrusion.

  Next, an embodiment of the present invention will be described below with reference to the drawings.

  In FIG. 1, reference numeral 1 denotes an extrusion die according to an embodiment of the present invention, and reference numeral 10 denotes an extrusion processing apparatus provided with an extrusion die 1. As shown in the figure, this extrusion processing device (semi-hollow shape material manufacturing device) 10 is of a direct extrusion processing type, including the extrusion die 1 of this embodiment, in addition to the container 11 and the stem 12. Etc. are provided.

  The extruded material 8 produced in the extrusion processing apparatus 10 is a semi-hollow shape material. Below, the extrusion material 8 is called a semi-hollow shape material.

  As shown in FIG. 9, the semi-hollow shape member 8 has a lip groove shape (lip channel shape) and is formed in a substantially C-shaped cross-sectional shape with a high tong ratio.

  The material of the semi-hollow shape member 8 is a metal, and in this embodiment, aluminum (including an alloy thereof, the same applies hereinafter).

  This semi-hollow shaped member 8 is provided with a tong part (void part) 82 provided inside thereof and extending in the length direction (extrusion direction E), and a slit-like tong opening provided in the peripheral wall and extending in the length direction. Part (peripheral wall opening part) 83, and the tongue part 82 is opened to the outside through the tongue opening part 83.

  As shown in FIGS. 1-7, the extrusion die 1 of this embodiment is divided | segmented into the die main body 2 arrange | positioned downstream with respect to the extrusion direction E, and the hall | plate plate 5 arrange | positioned upstream. 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 or ceramic such as SKD61 and SKD11, for example.

  The die body 2 of the extrusion die 1 has an upstream end surface 2 a disposed perpendicular to the extrusion direction E. Further, as shown in FIGS. 4 and 6, the die body 2 is provided with a forming hole 3 for forming the semi-hollow shape member 8 extending in the extrusion direction E from the upstream end surface 2 a of the die body 2 as shown in FIGS. A back escape 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 of the die body 2. The cross-sectional shape of the forming hole 3 is formed in a substantially C shape having a shape corresponding to the cross-sectional shape of the semi-hollow shape member 8 to be manufactured.

  In the present embodiment, as shown in FIGS. 2 and 3, the die main body 2 has all the bearing portions such as the inner peripheral bearing surface 31 and the outer peripheral bearing surface 32 forming the molding hole 3 formed in the die main body 2. It can be taken as a solid die. The inner peripheral bearing surface 31 is for molding the inner peripheral surface of the semi-hollow profile 8, and the outer peripheral bearing surface 32 is for molding the outer peripheral surface of the semi-hollow profile 8. The molding hole 3 is formed between the inner peripheral side and the outer peripheral side bearing surfaces 31, 32, that is, the molding hole 3 includes a gap between the inner peripheral side and the outer peripheral side bearing surfaces 31, 32.

  As shown in FIG. 8A, each bearing surface 31, 32 is inclined inward of the molding hole 3 with respect to the extrusion direction E over the entire length region of each bearing surface 31, 32 from the upstream end surface 2 a of the die body 2. It is inclined at an angle θ, that is, it is formed on an inclined surface over its entire length region. L is the bearing length in the extrusion direction E. The bearing length L is set within a range of 2 to 55 mm, for example.

  Further, in the die body 2, there are back relief surfaces 25 a and 25 a extending from the downstream end edges 31 b and 32 b of the bearing surfaces 31 and 32 to the outside of the molding hole 3 at an acute angle with respect to the bearing surfaces 31 and 32. The side surfaces 25b and 25b of the back escape holes 25 extending in the extrusion direction E from the outer edges of the back escape surfaces 25a and 25a are formed to be inclined outward with respect to the extrusion direction E. Furthermore, each bearing surface 31 and 32 makes the obtuse angle with respect to the upstream end surface 2a of the die body 2 at the upstream end edges 31a and 32a, and is in contact with the upstream end surface 2a.

  The inclination angle θ of each bearing surface 31, 32 with respect to the extrusion direction E is such that each bearing surface 31, 32 is shaped with respect to the extrusion direction E when the extrusion die 1 is bent downstream by the extrusion load F during extrusion processing. The angle is set so as not to be inclined to the outer side of 3. Preferably, θ is set within a range of 10 minutes to 120 minutes (ie, 0.17 ° to 2 °). By setting θ within this range, when the die body 2 is bent downstream by the extrusion load F during the extrusion process, the bearing surfaces 31 and 32 are moved outside the molding hole 3 with respect to the extrusion direction E. That is, it can be surely realized so as not to be inclined. That is, even when the die body 2 is bent downstream by the extrusion load F during the extrusion process, the extruded material 81 is reliably received by the bearing surfaces 31 and 32. be able to.

  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 82 of the semi-hollow shape member 8 is disposed. The tongue opening 83 is integrally connected to the outer peripheral portion 21 of the die body 2 at the tongue opening forming portion 23 for forming the tongue opening 83. 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. In addition, the tongue opening part molding part 23 can also be regarded as a proximal end constriction part of the tongue part molding part 22.

  The upstream end surface (front surface) of the tongue portion molding portion 22 is formed on a flat surface orthogonal to the axial direction (extrusion direction E). The cross-sectional shape (front shape) of the tongue portion molding portion 22 is formed in a substantially rectangular shape (square shape) having a large curvature radius at the corner corresponding to the cross-sectional shape of the tongue portion 82 of the semi-hollow shape member 8. .

  Further, as shown in FIG. 2, a fitting convex edge portion 29 projecting upstream is continuously provided in the circumferential direction (direction around the axis) on the outer peripheral edge portion of the upstream end surface (front surface) 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. 4, 5 and 7, the area between each of the four metal holes 55 is configured as a bridge 53, and two metal holes 55, 55 adjacent to each other in the circumferential direction are partitioned by the bridge 53. It has been. 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. A projecting portion 61 projecting in the downstream direction is integrally provided at the downstream end portion of the shaft center portion 50, and the tip (downstream end portion) of the projecting portion 61 is as shown in FIG. In the rear view state, it is formed as a rectangular dummy molding portion 6. The dummy molding part 6 is formed separately from the tongue part molding part 22 and corresponds to the position of the tongue part molding part 22 of the die body 2, and the tongue part molding part is formed in the weld chamber 51. It is arranged in a state facing the tongue portion molding portion 22 on the upstream side of 22, and is formed in a substantially similar shape to the tongue portion molding portion 22 as will be described in detail later.

  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) in the plate, it does not have a bearing portion (inner peripheral side bearing surface) that determines the product shape of the semi-hollow profile 8. 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.

  In addition, as will be described in detail later, the dummy molding portion 6 of the present embodiment mainly controls the flow (metal flow) of the extruded material 81 during extrusion, and applies an extrusion load (pressure) applied to the tongue portion molding portion 22. ) And may be referred to as a flow control unit or a pressure control unit.

  The downstream end surface (tip surface, back surface) of the dummy forming part 6 is formed as a flat surface orthogonal to the axial direction (extrusion direction E). Further, the cross-sectional shape (back surface shape) of the dummy forming portion 6 corresponds to the cross-sectional shape (front shape) of the tongue portion forming portion 22 of the die body 2 and is substantially rectangular (square shape) having a large curvature radius at the corner. Is formed.

  Further, as shown in FIG. 5, the dummy forming portion 6 is formed to be slightly smaller than the tong portion forming portion 22 in the front view state (see FIG. 3). Specifically, in the state of front view or rear view, the ratio (percentage) of the area of the downstream end face (back face) of the dummy forming part 6 to the area of the upstream end face (front face) of the tong part forming part 22; In other words, the ratio (the concealment ratio) at which the front surface of the tongue forming part 22 is concealed by the back surface of the dummy forming part 6 is preferably set to 60 to 97%, and more preferably set to 75 to 95%. Is good. That is, when the concealment ratio of the tongue forming part 22 by the dummy forming part 6 is too small, as will be described later, it is not possible to sufficiently reduce the extrusion load on the tongue forming part 22 during the extrusion process. There is a high possibility that the tongue opening molding portion 23 is damaged by the extrusion load, and the durability may be lowered. On the contrary, when the concealment ratio by the dummy forming part 6 is too large, as will be described later, it becomes difficult to appropriately control the metal flow at the time of extrusion, and it becomes difficult to perform stable extrusion. There is a fear.

  However, in the present invention, when only the effect of reducing the extrusion load of the tongue forming part 22 is regarded as important, the concealment ratio of the tongue forming part 22 by the dummy forming part 6 is set to 100% or more, that is, the dummy forming part 6 You may make it form a back surface shape larger than the front shape of the tongue part shaping | molding part 22. FIG. Further, if the concealment rate is set to 105% or more, the extrusion load reducing effect is further enhanced.

  Here, as shown in FIG. 6, in this embodiment, the boundary line between the tongue portion molding portion 22 and the tongue opening portion molding portion 23 is an imaginary straight line connecting both end portions of the inner peripheral side bearing surface 31 of the molding hole 3. L. Therefore, the virtual straight line L and the inner peripheral bearing surface 31 specify the contour line (outer peripheral shape) of the tongue portion molding portion 22, and the region surrounded by the contour line is the region of the tongue portion molding portion 22. Thus, the area of this region becomes equal to the area of the front surface of the tongue portion molding portion 22.

  Further, as shown in FIG. 6, when the width dimension of the tongue opening molding part 23 as the tongue length (the length of the virtual straight line L) is “W” and the front area of the tongue part molding part 22 is “St” The tong ratio T is obtained by (tongue part molding part front area St) / (width dimension W of the tongue opening molding part 23). And this invention can be suitably employ | adopted for the extrusion die 1 of the high tong ratio whose tong ratio T is 4 or more (T> = 4).

  In the present embodiment, the distance between the contour line on the back surface of the dummy molding part 6 and the contour line on the front surface of the tongue part molding part 22 is set to a substantially constant distance over the entire circumference. The shape (peripheral shape) is formed in a substantially similar shape to the front shape (peripheral shape) of the tongue portion molding part 22. Specifically, in the front view state, when the outer peripheral shape of the dummy molding part 6 is the contour line of the tongue part molding part 22 (the inner peripheral bearing surface 31 of the molding hole 3) as the base point line, It becomes a shape constituted by an inner contour line in a collection of equidistant circles centered on each base point. That is, the outer peripheral shape of the dummy forming part 6 is a shape constituted by equidistant lines with the contour line of the tongue forming part 22 as a base line.

  Furthermore, the back surface (downstream side end surface) of the dummy molding part 6 and the front surface (upstream side end surface) of the tongue part molding part 22 are arranged substantially in parallel.

  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.

  As shown in FIG. 3, in the extrusion die 1 of this embodiment assembled in this way, a gap 20 is formed between the back surface of the dummy molding portion 6 and the front surface of the tongue portion molding portion 22. The lower limit value of the width dimension S2 of the gap 20 is preferably set to 0.1 mm, and the upper limit value of the width dimension S2 of the gap 20 is an upstream side (that is, inlet side) width dimension (bearing width) of the molding hole 3. It is more preferable to set the same as S1. That is, it is preferable that the relationship of 0.1 mm ≦ “S2” ≦ “S1” is satisfied.

  Here, when the width dimension S2 of the gap 20 is too small, when the hole plate 5 is bent downstream due to the extrusion load applied to the hole plate 5 during the extrusion process, the dummy forming portion 6 of the hole plate 5 is deformed. There is a possibility that the tong portion molding portion 22 of the die body 2 is pressed against the tong portion molding portion 22, and a large load is applied to the tong portion molding portion 22, and the tong opening molding portion 23 is likely to be damaged by the load. On the contrary, when the width dimension S2 is too large, that is, when the width dimension S2 exceeds the width dimension S1 of the molding hole 3, the extruded material (metal) 81 constituted by the billet becomes the dummy molding part 6 and the tongue part molding part. It becomes easy to enter the gap 20 between 22. If the extruded material 81 enters the gap 20 and bites the extruded material 81, when the hole plate 5 is bent to the downstream side by the extrusion load, the dummy molding portion 6 is moved through the extruded material 81 to the tong portion. There is a risk that the molded part 22 is pressed, the tongue part molded part 22 is bent and the tongue opening molded part 23 is likely to be damaged.

  Further, in the extrusion die 1 of the present embodiment, the dummy molding part 6 and the tongue part molding part 22 are not mechanically connected and fixed by bolts, screws or the like, but the dummy molding part 6 and the tongue part molding part 22. Is a non-connected state or a non-fixed state, that is, a free state that is not linked to each other.

  In the extrusion die 1 of the present embodiment, there is a gap 22 between the dummy molding part 6 and the tongue part molding part 22, and the dummy molding part 6 is in an unfixed state with respect to the tongue part molding part 22, Only the bridge 53 supports the extrusion load applied to the dummy forming portion 6 during the extrusion process.

  As shown in FIG. 1, the extrusion die 1 of this embodiment is held via a die holder (not shown) on the downstream side of the container 11 in the extrusion processing apparatus 10.

  And the extrusion process (manufacturing method of a semi-hollow shape material) using this extrusion processing apparatus 10 is the same as the well-known extrusion process method. That is, an aluminum billet as an extrusion material (molding material) 81 loaded in the container 11 of the extrusion apparatus 10 is pushed in the extrusion direction E through the dummy block 13 by the stem 12. As a result, the extruded material 81 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 81 is molded to produce the semi-hollow profile 8 shown in FIG. 9 having a cross-sectional shape corresponding to the molding hole 3.

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

  As shown in FIGS. 8A and 8B, the die body 2 of the extrusion die 1 is slightly bent downstream by receiving the extrusion load F during the extrusion process. Even when the die body 2 is bent in this way, the inner peripheral side and outer peripheral side bearing surfaces 31, 32 are inclined inward with respect to the extrusion direction E over the entire length region, so that the molding hole 3 Extruded material 81 passing through can be received in the full length region of each bearing surface 31, 32. Therefore, as in the case of the conventional extrusion die 101 shown in FIGS. 10A and 10B, a problem caused by wear of the corner portion 104 c between the choke portion 104 a and the straight portion 104 b of the bearing surface 104, that is, a die line, mussel, etc. Thus, the semi-hollow profile 8 having excellent surface properties and dimensional accuracy can be produced over a long period of time.

  Furthermore, since each bearing surface 31, 32 of the die body 2 is inclined inward of the molding hole 3 with respect to the extrusion direction E over the entire length region, each bearing surface 31 is produced when the die body 2 is manufactured. , 32 can be formed easily, for example, by wire-cut electric discharge machining.

  Furthermore, 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 in the die body 2, the extruded material 81 is on the outer peripheral side of the dummy molding part 6 at the time of extrusion processing. The extruding material 81 is not pressed against the center (main part) of the tongue part molding part 22 and the extrusion load applied to the tongue part molding 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, it is assumed that the hole plate 5 is bent by the extrusion load and the dummy molding part 6 is pushed downstream. Moreover, it can prevent effectively that the dummy shaping | molding part 6 press-contacts to the tongue part shaping | molding part 22. FIG. 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 molded part 6 is not fixed to the tongue molded part 22, even if the dummy molded part 6 is displaced due to the deflection of the hole plate 5, it follows the displacement. As a result, the tongue part molding part 22 is not displaced, and the adverse effect of the displacement of the dummy molding part 6 does not reach the tongue part molding 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 this embodiment, since the width dimension S2 of the gap 20 between the dummy molding part 6 and the tongue part molding part 22 is set narrower than the width dimension S1 of the molding hole 3, the extruded material 81 has priority. Thus, the extrusion material 81 can be reliably prevented from entering the gap 20 between the dummy molding portion 6 and the tongue portion molding portion 22. For this reason, it is possible to reliably prevent an adverse effect due to the deflection of the hole plate 5 from reaching the tongue portion molding portion 22 due to a problem caused by the penetration of the extruded material 81 into the gap 20, for example, the extrusion material 81 bites into the gap 20. Accordingly, the durability of the extrusion die 1 can be improved more reliably.

  In the present embodiment, since the bearing portions that determine the product shape, such as the inner peripheral bearing surface 31 and the outer peripheral bearing surface 32, are formed only on the die body 2 side, Superior dimensional accuracy compared to ones in which the peripheral bearing surface and outer peripheral bearing surface are dispersed in a male mold (hole plate) and a female mold (port plate) (example: port hole die) A semi-hollow profile 8 can be produced.

  That is, if the bearings are formed in a male and female shape, the dimensional accuracy and shape of the bearings are maintained and managed, for example, adjustment of the positional relationship between the inner and outer bearing surfaces (bearing width). Adjustment), etc., and high dimensional accuracy cannot be maintained, and it may be difficult to manufacture a high-quality semi-hollow shape material.

  On the other hand, in this embodiment, since the bearing surfaces 31 and 32 are concentrated on the die body 2 side, the dimensional accuracy and shape of the bearing surfaces 31 and 32 such as position adjustment between the bearing surfaces 31 and 32 are adjusted. Maintenance and management can be easily performed with high accuracy, high dimensional accuracy can be maintained, and a high-quality semi-hollow profile 8 can be manufactured easily and reliably.

  Moreover, in this embodiment, since the outer periphery shape of the dummy molding part 6 is formed slightly smaller than the outer periphery shape of the tongue part molding part 22, the extruded material 81 flowing near the outer periphery of the dummy molding part 6 is It is brought into pressure contact with the outer peripheral portion of the tongue portion forming portion 22 and guided to the outer peripheral portion to flow radially outward (outer radial direction) and flows into the forming hole 3. On the other hand, the extruded material 81 that flows in the vicinity of the peripheral wall surface of the weld chamber 51 comes into pressure contact with the outer peripheral portion 21 of the die body 2 and is guided by the outer peripheral portion 21 to flow radially inward (inner diameter direction). Then, it flows into the molding hole 3. Thus, the extrusion material 81 can form a desired ideal flow (metal flow) of the extrusion material 81 in which the extrusion material 81 flows into the molding hole 3 from both sides in the inner diameter direction and the outer diameter direction. Can be performed smoothly, and a high-quality semi-hollow shape product can be more reliably manufactured.

  In particular, in the present embodiment, the outer peripheral shape of the dummy molding part 6 is a shape constituted by equidistant lines with the contour line of the tongue part molding part 22 as a base line. It can flow smoothly from the inside to the outside and flow into the forming hole 3, making it possible to realize the ideal metal flow more reliably, and more reliable semi-hollow shape products. Can be manufactured.

  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.

  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 8, ie, the extrusion material 81, is aluminum, in this invention, metals other than aluminum may be used in addition to this.

  Moreover, in the said embodiment, although the extrusion material 8 is a semi-hollow shape material, in this invention, you may be a solid material besides this.

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

1: Extrusion die 10: Extrusion device 2: Die body 22: Tongue forming part 23: Tongue opening forming part 3: Molding hole 31: Inner peripheral bearing surface 32: Outer peripheral bearing surface 5: Hall plate 50: Shaft Core 51: Weld chamber 55: Dummy molding part 8: Semi-hollow shape (extruded material)
81: Extruded material 82: Tongue part 83: Tongue opening E: Extrusion direction

Claims (7)

  An extrusion die characterized in that a bearing surface of a molding hole for molding the extruded material is inclined inward of the molding hole with respect to the extrusion direction over the entire length region. The extruded material is a semi-hollow material,
The extrusion dies are formed on the upstream side of the forming hole, the tong part forming part for forming the tongue part of the semi-hollow shape material, the tong opening forming part for forming the tong opening part of the semi-hollow shape material, and A weld chamber provided, and a plurality of metal holes penetrating along the extrusion direction from the upstream side to the weld chamber,
The extrusion die according to claim 1, wherein a dummy molding part is provided in the weld chamber so as to correspond to the upstream side of the tongue part molding part. A die body, and a hole plate provided on the upstream side of the die body,
The die body has the molding hole, the tongue part molding part, and the tongue opening molding part,
The extrusion die according to claim 2, wherein the hole plate has the metal hole.   The extrusion die according to claim 2 or 3, wherein the dummy molding portion is in an unfixed state with respect to the tongue portion molding portion.   The extrusion die according to any one of claims 2 to 4, wherein an area of the downstream end face of the dummy forming portion is set smaller than that of an upstream end face of the tongue forming portion.   6. The front view as viewed along the extrusion direction from the upstream side, the contour line of the dummy molding part is disposed radially inward from the contour line of the tongue part molding part. Extrusion dies described in 1.   An extruded material is produced by an extrusion process using the extrusion die according to claim 1.

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