JP2012006051A - Extrusion die for manufacturing half-hollow shape material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extrusion die for manufacturing a half-hollow shape material, with which precision of the thickness dimension of the half-hollow shape material is improved.SOLUTION: The extrusion die 1 has: a forming hole 3 for forming the half-hollow shape material 8; a tong part-forming part 22 for forming the tong part 82 of the half-hollow shape material 8; a tong opening part-forming part 23 for forming the tong opening part 83 of the half-hollow shape 8; a weld chamber 51 and a metal hole 55. In the weld chamber 51, a dummy forming part 6 is provided corresponding to the upstream side of the tong part-forming part 22. The width dimension t2 of the tip side portion 3a of the tong part-forming part 22 in the forming hole 3 is set larger than the thickness dimension t1 of the corresponding portion 8a of the tip side portion 3a in the half-hollow shape 8.

Description

  The present invention relates to an extrusion die for producing a semi-hollow profile used when producing a semi-hollow profile by extrusion, and a method for producing a semi-hollow profile using the extrusion die.

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

  In order to produce a semi-hollow profile having a substantially C-shaped cross-section having slit-like tong openings (peripheral wall openings) along the length direction on the peripheral wall, a method using a solid die as an extrusion die is well known. It is. For example, Japanese Unexamined Patent Publication No. 2000-176536 (Patent Document 1) discloses a die having such a configuration.

  As shown in FIG. 10, this type of die 102 is provided with a forming hole 103 for forming a semi-hollow profile at the center. Inside the forming hole 103, a tong portion forming portion 122 for forming a tong portion which is a space of the semi-hollow shape material is disposed. Furthermore, the tongue portion molding portion 122 is integrally connected to the die outer peripheral portion 121 at a tongue opening portion molding portion 123 (cantilever support portion) that molds a tongue opening portion of a semi-hollow profile. In other words, the tongue part molding part 122 is supported in a cantilever manner by the die outer peripheral part 121 via the tongue opening part molding part 123. The width dimension of the forming hole 103 is set to be equal to the thickness dimension of the obtained semi-hollow profile.

  FIG. 11 is a cross-sectional view taken along line XX in FIG. In the figure, reference numerals 131 and 132 denote an inner peripheral bearing surface and an outer peripheral bearing surface that respectively form the outer peripheral surface and the inner peripheral surface of the semi-hollow profile, and E is the extrusion direction.

JP 2000-176536 A

  When manufacturing a semi-hollow shape material using such a solid die, if the tong ratio of the semi-hollow shape material is large, the cantilever supporting force of the tongue portion forming portion 122 in the tongue opening forming portion 123 ( The strength of the tong opening forming part) is weakened, so that the extrusion load F acting on the tongue forming part 122 during the extruding process is more likely to cause damage in the tong opening forming part 123, and sufficient durability. It was difficult to get.

  Further, as shown by a two-dot chain line in FIG. 11, the tong portion molding portion 122 of the die 102 receives the extrusion load F during the extrusion process, and bends to the downstream side around the tong opening portion molding portion 123. The width dimension of the tip side portion 103a of the tongue portion molding portion 122 in the molding hole 103 of 102 is reduced from t4 to t3. As a result, the tip side portion 103a of the tongue portion molding portion 122 in the obtained semi-hollow profile is obtained. There was a drawback that the thickness of the corresponding portion was reduced from t4 to t3.

  The present invention has been made in view of the above-described technical background, and the object thereof is to provide a sufficient quality and capable of producing a high-quality semi-hollow shape material. An object of the present invention is to provide an extrusion die for producing a semi-hollow shape member capable of improving the dimensional accuracy, and a method for producing a semi-hollow shape material using the extrusion die.

  The present invention provides the following means.

[1] Molding hole for molding a semi-hollow shape member, a tongue portion molding portion for molding a tongue portion of the semi-hollow shape member, a tongue opening portion molding portion for molding a tongue opening portion of the semi-hollow shape material, and the molding A weld chamber provided on the upstream side of the hole and a plurality of metal holes penetrating along the extrusion direction from the upstream side to the weld chamber, and an extruded material introduced from each metal hole defines the weld chamber. An extrusion die for producing a semi-hollow shape material that passes through the molding hole via,
In the weld chamber, a dummy molding part is provided corresponding to the upstream side of the tongue part molding part,
A semi-hollow shape member characterized in that a width dimension of a tip side portion of the tong portion molding portion in the molding hole is set larger than a thickness dimension of a corresponding portion of the tip side portion in the semi-hollow shape material. Extrusion dies for manufacturing.

[2] 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 for producing a semi-hollow profile according to item 1, wherein the hole plate has the metal hole.

  [3] The extrusion die for manufacturing a semi-hollow shape member according to item 1 or 2, wherein the dummy molding part is in an unfixed state with respect to the tongue part molding part.

  [4] The extrusion die for manufacturing a semi-hollow shape member according to any one of the preceding items 1 to 3, wherein an area of the downstream end face of the dummy forming portion is set to be smaller than that of an upstream end face of the tongue forming portion.

  [5] 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 of the contour line of the tongue part molding part. An extrusion die for producing a semi-hollow profile according to any one of the above.

  [6] A method for producing a semi-hollow shape material, comprising producing a semi-hollow shape material by extrusion using the extrusion die according to any one of 1 to 5 above.

  The present invention has the following effects.

  In the extrusion die of the preceding item [1], since the dummy molding part is provided corresponding to the upstream side of the tongue part molding part, the extrusion material flows into 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 acting on the tongue part molding part is reduced. For this reason, the possibility that the tongue opening molded portion is damaged by the extrusion load can be kept low, and the durability can be improved.

  Furthermore, when the extrusion load reduced by the dummy forming portion acts on the tongue portion forming portion, the tongue portion forming portion bends to the downstream side. However, in the extrusion die of the above item [1], the tongue in the forming hole is bent. Since the width dimension of the tip side part of the part molding part is set larger than the thickness dimension of the corresponding part of the tip side part of the tongue part molding part in the semi-hollow shape material, the tongue part molding part is bent downstream. As a result, the width dimension of the tip side portion of the tong portion molding portion in the molding hole is reduced and approaches the thickness dimension of the corresponding portion of the semi-hollow shape member. Thereby, the precision of the width dimension of the corresponding part of a semi-hollow shape material improves.

  In the extrusion die of [2], the bearing portion that determines the product shape is concentrated on the die body side, so that the port hole die is 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 preceding item [3], even if the extrusion die (hole plate) is bent by the extrusion load and the dummy molded portion is displaced, the adverse effect due to the displacement of the dummy molded portion is exerted on the tongue molded portion. In this case, the durability of the extrusion die can be further improved.

  With the extrusion dies of [4] and [5], a desired metal flow can be formed, stable extrusion can be performed, and a high-quality semi-hollow shape can be more reliably manufactured.

  In the method for manufacturing a semi-hollow shape member according to [6], the accuracy of the width dimension of the corresponding portion of the semi-hollow shape material can be improved.

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. 8A is a cross-sectional view taken along line XX in FIG. 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. 10 is a front view of a conventional extrusion die as viewed from the upstream side. 11 is a cross-sectional view taken along line XX in FIG.

  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.

  As shown in FIG. 9, the semi-hollow shape member 8 produced in the extrusion processing apparatus 10 has a lip groove shape (lip channel shape) and has a substantially C-shaped cross-sectional shape with a high tong ratio. Is formed.

  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.

  As shown in FIGS. 4 and 6, the die body 2 of the extrusion die 1 is provided with a molding hole 3 through which the semi-hollow shape member 8 is formed at the center thereof so as to penetrate in the extrusion direction E. The cross-sectional shape of the molding hole 3 is formed in a substantially C-shape that substantially corresponds to the cross-sectional shape of the semi-hollow shaped 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 shape member 8, and the outer peripheral bearing surface 32 is for forming the outer peripheral surface of the semi-hollow shape member 8. The inner and outer bearing surfaces 31 and 32 are formed in parallel with the extrusion direction E, respectively.

  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 includes a weld chamber 51 provided corresponding to the molding hole 3 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 metal hole 55 having an upstream end opened to the upstream end face (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 pressure reducing effect of the tongue forming part 22 is regarded as important, the concealing rate of the tongue forming part 22 by the dummy forming part 6 is set to 100% or more, that is, the back surface of the dummy forming part 6. You may make it form a shape larger than the front shape of the tongue part shaping | molding part 22. FIG. Furthermore, if the concealment rate is set to 105% or more, the pressure reduction 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 set equal to the width dimension (bearing width) S1 of the forming hole 3. Is more preferable. 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 of the hole plate 5, 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.

  According to the extrusion processing apparatus 10 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 in the die body 2, the extrusion process is performed during the extrusion process. When the material 81 flows on the outer peripheral side of the dummy molded part 6, the extruded material 81 is not pressed against the central part (main part) of the tongue part molded part 22, and an extrusion load acting on the tongue part molded part 22 is generated. It 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 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, and the durability can be further improved.

  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, 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, breakage of the tongue opening molding part 23 can be prevented more reliably, and the durability can be improved more reliably.

  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. The durability 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 performed easily with high accuracy, high dimensional accuracy can be maintained, and a high-quality semi-hollow profile can be easily and reliably manufactured.

  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.

  In addition, this invention is suitable when the cross-sectional shape of the semi-hollow shape member 8 is 9 mm or more and 150 mm or less in the diameter of the minimum circumscribed circle. If it is less than 9 mm, the ratio of the extrusion load applied to the tongue part molding part 22 from the gap 20 via the extrusion material 81 to the extrusion load reduced by the dummy molding part 6 becomes large, and the effect of the present invention is reduced. This is because machining exceeding the width S2 of the gap 20 between the dummy molded part 6 and the tongue molded part 22 becomes difficult.

  Furthermore, in the extrusion die 1 of the present embodiment, as shown in FIGS. 6, 8A and 9, the width dimension t2 of the tip side portion 3a of the tongue portion molding portion 22 in the molding hole 3 of the die body 2 is a semi-hollow shape material. 8 is set to be slightly larger than the thickness t1 of the corresponding portion 8a of the tip side portion 3a of the tongue portion molding portion 22 (ie, t2> t1). More specifically, the width dimension t2 is designed such that the width dimension t2 becomes t1 when the tongue portion molding portion 22 is bent downstream.

  The increment of t2 with respect to t1 is preferably about 10% of t1, although it depends on the tong ratio of the cross section of the semi-hollow profile 8 and the like. That is, when t1 is 1 mm, for example, t2 is preferably about 1.1 mm.

  According to this extrusion die 1, the extrusion load F acting on the tongue portion molding portion 22 of the die body 2 during extrusion processing is reduced by the dummy molding portion 6 of the hole plate 5 as described above, but a part thereof As shown in FIGS. 8A and 8B, it acts on the tongue portion molding portion 22 (particularly the outer peripheral portion of the tongue portion molding portion 22). As a result, the tongue portion molding portion 22 is slightly bent downstream from the tongue opening portion molding portion 4, and accordingly, the width dimension of the tip side portion 3a of the tongue portion molding portion 22 in the molding hole 3 is reduced from t2. Then, the thickness t1 of the corresponding portion 8a of the semi-hollow shape member 8 is approached. Thereby, this extrusion die 1 has the advantage that the accuracy of the thickness of the semi-hollow profile 8 is improved.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope 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 semi-hollow shape member 20 is aluminum, in this invention, metal other than aluminum may be used in addition to this.

  Furthermore, in the present invention, the number and shape of the metal holes 55 of the hole plate 5 are not limited to those of the above embodiment.

  In the above-described embodiment, it is desirable for the above-described reason that the dummy molding portion 6 and the tongue portion molding portion 22 are arranged in a separated state. It does not exclude that the downstream end face of the dummy forming portion 6 and the upstream end face of the tongue forming portion 22 are in contact with each other in a non-fixed state with respect to the forming portion.

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

1: Extrusion die 10: Extrusion device 2: Die body 22: Tongue part molding part 23: Tongue opening molding part 3: Molding hole 3a: Tip side part 5 of the tongue part molding part in the molding hole: Hole plate 50: Shaft Core 51: Weld chamber 55: Metal hole 6: Dummy forming part 8: Semi-hollow shaped member 8a: Corresponding part 81 at the front end side of the tongue forming part in the semi-hollow shaped member Aperture

Claims (6)

A forming hole for forming a semi-hollow shape material, a tong portion forming portion for forming a tong portion of the semi-hollow shape material, a tong opening shape forming portion for forming a tong opening portion of the semi-hollow shape material, and an upstream of the forming hole A weld chamber provided on the side and a plurality of metal holes penetrating along the extrusion direction from the upstream side to the weld chamber, and the extruded material introduced from each metal hole passes through the weld chamber to An extrusion die for producing a semi-hollow shape material that passes through a molding hole,
In the weld chamber, a dummy molding part is provided corresponding to the upstream side of the tongue part molding part,
A semi-hollow shape member characterized in that a width dimension of a tip side portion of the tong portion molding portion in the molding hole is set larger than a thickness dimension of a corresponding portion of the tip side portion in the semi-hollow shape material. Extrusion dies for manufacturing. 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 for producing a semi-hollow shape member according to claim 1, wherein the hole plate has the metal hole.   The extrusion die for producing a semi-hollow shape member according to claim 1 or 2, wherein the dummy molding part is in an unfixed state with respect to the tongue part molding part.   The extrusion die for producing a semi-hollow shape member according to any one of claims 1 to 3, 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.   5. The front view as viewed from the upstream side along the extrusion direction, wherein the contour line of the dummy molding part is disposed radially inside the contour line of the tongue part molding part. An extrusion die for producing a semi-hollow shape material according to 1.   A method for producing a semi-hollow shape material, comprising producing a semi-hollow shape material by extrusion using the extrusion die according to any one of claims 1 to 5.

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