JP5554171B2 - Extrusion dies for semi-hollow shape manufacturing - Google Patents

Description

  The present invention relates to an extrusion die for producing a semi-hollow shape material used when producing a semi-hollow shape material by extrusion, and a related technique.

  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 section having a substantially C-shaped cross section having a slit-like tong opening (peripheral wall opening) along the length direction on the peripheral wall by extrusion, a method using a solid die or a horodice is used. The method is well known.

  As shown in Patent Document 1, a solid die is provided with a forming hole (bearing hole) for forming a semi-hollow profile at the center thereof. Inside this forming hole, a tong part forming part for forming a tongue part which is a space of the semi-hollow shape material is arranged, and this tong part forming part forms a tong opening for the semi-hollow shape material. It is integrally connected to the outer periphery of the die at the opening forming part (cantilever support part).

  Further, as shown in Patent Document 2, the horodice is composed of a combination of a female port plate and a male hole plate, and an annular molding hole (bearing hole) is formed by a gap between the bearing portions of both plates. In addition to being formed, a cross-linking piece for forming an opening is provided in a mode in which a part of the forming hole is closed. The hole plate includes a weld chamber provided corresponding to the molding hole, and a plurality of metal holes penetrating from the upstream side to the weld chamber and provided in the circumferential direction at intervals, and passes through each metal hole. The molding material introduced into the weld chamber passes through the molding hole.

JP 2000-176536 A JP-A-63-16809

  By the way, in the holrodice as shown in the above-mentioned patent document 2, when manufacturing a cross-sectional non-symmetrical shape such as a modified cross-section, the forming hole has a non-symmetrical shape, and therefore, along the extrusion direction from the upstream side. When viewed from the front, the distance from each inner edge of each metal hole to the outer peripheral edge of the forming hole is different. For example, the distance from the inner edge of a predetermined metal hole to the outer peripheral edge of the forming hole may be longer than the distance from the inner edge of another metal hole to the outer peripheral edge of the forming hole. Then, among the molding materials introduced into each metal hole, the molding material from the predetermined metal hole to the molding hole flows over a long distance with respect to the molding material from the other metal hole to the molding hole. The flow rate of the molding material toward the molding hole differs between the metal holes. If the flow rate of the molding material toward the molding hole differs depending on the metal hole in this way, the flow rate of the molding material in the molding hole varies, and the product is twisted, resulting in a high quality semi-finished product. There arises a problem that it is difficult to obtain a hollow shape member.

  This invention is made | formed in view of said subject, and it aims at providing the die | dye for semi-hollow shape material manufacture which can manufacture a high quality semi-hollow shape material, and its related technique.

  In order to solve the above problems, the present invention comprises the following means.

[1] A forming hole for forming a semi-hollow shape member having a non-symmetrical cross section, a tongue portion forming portion for forming a tongue portion of the semi-hollow shape member, and a tongue opening for forming a tong opening portion of the semi-hollow shape member A molding part, a weld chamber provided on the upstream side of the molding hole, a metal hole penetrating along the extrusion direction from the upstream side to the weld chamber and provided in a plurality at intervals in the circumferential direction, and a circumferential direction A plurality of bridges respectively provided between adjacent metal holes, and a molding material introduced from the plurality of metal holes is allowed to pass through the molding hole through the weld chamber. An extrusion die,
In the front view state seen along the extrusion direction from the upstream side, each inner edge portion on the inner peripheral surface of each metal hole is disposed at the same position or outer side with respect to the outer peripheral edge portion of the molding hole,
In the front view state, the shortest distance from each inner edge of each metal hole to the outer peripheral edge of the molding hole is substantially equal,
An extrusion die for producing a semi-hollow mold material, wherein each metal hole is formed so that the areas thereof are substantially equal in a front view state.

  [2] The previous item in which [(Rmax−Rmin) / Rmax] × 100 is adjusted to 10 (%) or less when the maximum distance among the shortest distances is “Rmax” and the minimum distance is “Rmin”. 2. An extrusion die for producing a semi-hollow mold material according to 1.

  [3] Of the area of each metal hole, [Amax] / Amax] × 100 is adjusted to 15 (%) or less when the maximum is “Amax” and the minimum is “Amin”. 3. An extrusion die for producing a semi-hollow profile according to 1 or 2 above.

[4] The inner peripheral surface of the metal hole has an inner wall surface, an outer wall surface, and a bridge wall surface,
4. The extrusion die for producing a semi-hollow shape member according to any one of items 1 to 3, wherein a radius of curvature between the outer wall surface and the bridge wall surface in any one of the metal holes is different from that of the other metal hole.

[5] A die body and a hole plate provided upstream thereof are provided separately.
The molding hole, the tongue part molding part, and the tongue opening part molding part are provided in the die body,
The extrusion die for producing a semi-hollow shape member according to any one of the preceding items 1 to 4, wherein the weld chamber, the metal hole, and the bridge are provided in the hole plate.

  [6] The extrusion die for manufacturing a semi-hollow shape member according to item 5, wherein a dummy forming portion is provided in the weld chamber in the hole plate corresponding to the upstream side of the tongue portion forming portion of the die body.

  [7] The extrusion die for manufacturing a semi-hollow shape member according to [6], wherein the dummy molding part is in an unfixed state with respect to the tongue part molding part.

  [8] The extrusion die for producing a semi-hollow profile according to the above item 6 or 7, wherein the dummy molded part is arranged in a state of being separated from the tongue part molded part.

[9] An apparatus for producing a semi-hollow profile comprising an extrusion die for producing a semi-hollow profile by extruding an extruded material,
The said extrusion die is comprised by the extrusion die for semi-hollow shape material manufacture of any one of preceding clauses 1-8, The manufacturing apparatus of the semi-hollow shape material characterized by the above-mentioned.

  [10] A semi-hollow profile is produced by extruding an extruded material using the extrusion die for producing a semi-hollow profile described in any one of 1 to 8 above. Semi-hollow shape manufacturing method.

  According to the extrusion die for producing a semi-hollow profile of the invention [1], the molding material flows from each metal hole into the entire area of the molding hole with a uniform flow rate in a balanced manner, so that good flow characteristics can be obtained. It is possible to produce a high quality semi-hollow shape material that is free from problems such as twisting.

  According to the extrusion dies for producing semi-hollow profile of the inventions [2] and [3], the above effects can be obtained more reliably.

  According to the extrusion die for producing a semi-hollow profile of the invention [4], the area of the metal hole can be adjusted more appropriately, and the flow characteristics of the molding material can be further improved.

  According to the extrusion die for producing a semi-hollow shape member of the invention [5], since the bearing portion for determining the product shape is formed on the die body side, the position adjustment between the inner peripheral side and the outer peripheral side bearing portion is performed. Thus, the dimensional accuracy and shape of each bearing part can be easily and accurately managed, and a high-quality semi-hollow shape can be easily and reliably manufactured.

  According to the extrusion die for producing a semi-hollow shape material of the invention [6], since the dummy molding part is provided on the upstream side of the tongue part molding part, the extrusion material flows on the outer peripheral side of the dummy molding part during the extrusion process. As a result, the extruded material does not come into pressure contact with 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.

  According to the extrusion die for producing a semi-hollow shape member of the invention [7], even if the hole plate is bent by the extrusion load and the dummy molding part is displaced, the adverse effect due to the displacement reaches the tongue part molding part. The durability can be further improved.

  According to the extrusion die for producing a semi-hollow shape member of the invention [8], since the gap is formed between the dummy forming part and the tongue part forming part, the hole plate is bent by the extrusion load, and the dummy is formed. Even if the molding part is pushed downstream, it is possible to effectively prevent the dummy molding part from coming into pressure contact with the tongue part molding part. For this reason, a great load is not applied to the tongue part molding part, damage to the tongue opening part molding part can be reliably prevented, and durability can be further improved.

  According to the semi-hollow shape manufacturing apparatus of the invention [9], the same effect can be obtained as described above.

  According to the semi-hollow shape manufacturing method of the invention [10], similar effects can be obtained as described above.

FIG. 1 is a sectional view showing an extrusion processing apparatus to which an extrusion die according to an embodiment of the present invention is applied. FIG. 2 is a cross-sectional view showing the extrusion die of the embodiment. FIG. 3 is an enlarged cross-sectional view of the periphery of the dummy forming portion in the extrusion die of the embodiment. FIG. 4 is an exploded perspective view showing the extrusion die of the embodiment. FIG. 5 is a front view of the extrusion die of the embodiment as viewed from the upstream side. FIG. 6 is a front view of the die body applied to the extrusion die of the embodiment as seen from the upstream side. FIG. 7 is a rear view of the hole plate applied to the extrusion die of the embodiment as viewed from the downstream side. FIG. 8 is a cross-sectional view showing a semi-hollow shape member manufactured by the extrusion processing apparatus of the embodiment. FIG. 9 is a front view for explaining the positional relationship between the metal holes and the forming holes in the extrusion processing apparatus of the embodiment. FIG. 10A is a front view for explaining a method of forming a bridge in the extrusion die of the embodiment. Drawing 10B is a front view for explaining the formation method of the inner edge part of the metal hole in the extrusion die of an embodiment. FIG. 11A is a front view showing a reference metal hole. FIG. 11B is a front view for explaining a method of changing the area of the metal hole. FIG. 11C is a front view for explaining a method for changing the area of the metal hole.

  FIG. 1 is a sectional view showing an extrusion apparatus 10 to which an extrusion die 1 according to an embodiment of the present invention is applied. 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. 8, the semi-hollow shape member 8 manufactured in the extrusion processing apparatus 10 is formed in a lip groove shape (lip channel shape), has a non-axisymmetric cross section and a substantially pentagonal shape, and has a tong ratio. It is formed in a high substantially C-shaped cross-sectional shape.

  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).

  The semi-hollow shape member 8 is provided with a tong portion (void portion) 82 provided on the inner side and extending in the length direction (extrusion direction E), and a slit-like tong provided on the outer peripheral wall and extending in the length direction. An opening (peripheral wall opening) 83 is provided, and the tongue 82 is opened to the outside through the tongue opening 83.

  As shown in FIGS. 1-7, the extrusion die 1 of this embodiment is equipped with the die main body 2 arrange | positioned downstream with respect to the extrusion direction E, and the hall | plate plate 5 arrange | positioned upstream. Yes. 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 of the extrusion die 1 is provided with a molding hole 3 for molding the semi-hollow shape member 8 in the center thereof so as to penetrate in the extrusion direction E. The cross-sectional shape of the molding hole 3 is substantially C-shaped, which is a shape corresponding to the cross-sectional shape of the semi-hollow shaped member 8 to be manufactured, and is formed into a substantially pentagonal shape that is axisymmetric.

  In the present embodiment, the die body 2 is configured such that all bearing parts such as the inner peripheral side bearing part 31 and the outer peripheral side bearing part 32 constituting the molding hole 3 are set in the die main body 2 and are formed as solid dies. It can also be captured.

  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 on the die body outer peripheral part 21 via the cantilever support part as the tongue opening molding part 23. 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 pentagonal shape corresponding to the cross-sectional shape of the tongue portion 82 of the semi-hollow shape member 8.

  Further, on the outer peripheral edge portion of the upstream end surface (front surface) of the die body 2, a fitting convex edge portion 29 that protrudes upstream is formed continuously in the circumferential direction.

  On the other hand, the hall plate 5 includes a weld chamber 51 on the downstream side (back side), and the weld chamber 51 is opened to the downstream side. 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 shape (cross-sectional shape) of the metal hole 55 in a front view seen from the upstream side along the extrusion direction is formed in a substantially 1/6 circle, and the metal holes 55 are arranged at substantially equal intervals in the circumferential direction. 6 are formed.

  As will be described in detail later, each metal hole 55 has a different shape (cross-sectional shape) when viewed from the front, but the areas (cross-sectional areas) when viewed from the front are substantially equal to each other.

  Needless to say, in the present invention, the number of metal holes 55 is not limited to six, and any number of metal holes 55 may be formed as long as the number is two or more.

  A region between each of the six metal holes 55 is configured as a bridge 53. Each bridge 53 is arranged to extend radially outward (radial direction) in a front view state, and adjacent metal holes 55 and 55 are partitioned by the bridge 53.

  A portion surrounded by the six metal holes 55 in the hall plate 5 is configured as an axial center portion 50 disposed along the axial center. A projecting portion 61 projecting in the downstream direction is provided at the downstream end portion of the axial center portion 50, and the tip end (downstream end portion) of the projecting portion 61 is formed as a dummy molding portion 6. ing. The dummy forming portion 6 corresponds to the position of the tongue portion forming portion 22 of the die body 2 and is disposed in a state of facing the tongue portion forming portion 22. The portion 22 is formed in a substantially similar shape.

  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 part (inner peripheral side bearing part) that determines the product shape of the semi-hollow shape member 8, but an inner peripheral bearing part. The tongue part forming part 22 is formed separately. 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 forming portion 6 of the present embodiment mainly controls the flow (metal flow) of the extruded material 81 and adjusts the pressure to the tong portion forming portion 22 during the extrusion process. It may be called 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). Furthermore, the cross-sectional shape (back surface shape) of the dummy forming portion 6 is formed in a substantially pentagonal shape corresponding to the cross-sectional shape (front shape) of the tongue portion forming portion 22 of the die body 2.

  Further, the dummy molding portion 6 is formed slightly smaller than the tongue portion molding portion 22 in a front view state. 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 the present 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 portion 31 of the molding hole 3. L. Therefore, the virtual straight line L and the inner peripheral bearing portion 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 tongue length (the length of the imaginary straight line L) is “W” and the front area of the tongue portion molding portion 22 is “St”, the tongue ratio T is (tongue portion molding portion). It is obtained by the front area St) / (tongue length W). And this invention can be suitably employ | adopted for the extrusion die of the high tong ratio whose tong ratio T is 4 or more (T> = 4).

  Moreover, in this embodiment, the space | interval of the back surface outline in the dummy shaping | molding part 6 and the front outline in the tongue part shaping | molding part 22 is set to the fixed distance over the perimeter, and the back surface shape of the dummy shaping | molding part 6 is set. The (peripheral shape) is formed in a substantially similar shape to the front shape (peripheral shape) of the tongue part molding part 22. Specifically, in the front view state, when the outer peripheral shape of the dummy molding portion 6 is the contour line of the tongue portion molding portion 22 (inner peripheral side bearing portion 31 of the molding hole 3) as the base point row, 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. Needless to say, the width dimension (bearing width) S1 of the molding hole 3 is equal to the thickness (thickness) dimension of the semi-hollow profile 8.

  Here, when the width dimension S2 of the gap 20 is too small, when the hole plate 5 is bent by the extrusion load applied to the hole plate 5 at the time of extrusion, the dummy forming portion 6 of the hole plate 5 becomes the die body. There is a possibility that 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, the dummy molded portion 6 is inserted through the extruded material 81 when the hole plate 5 is bent by the extrusion load. , The tongue portion molding portion 22 is bent and the tongue opening portion molding portion 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 present embodiment, the inner peripheral surface of each metal hole 55 in the front view state is configured by an inner wall surface 55a, an outer wall surface 55b, and two bridge wall surfaces 55c and 55c.

  In the front view state, the inner wall surfaces 55a as inner edges of the metal holes 55 are radially outward (outer diameter direction) with respect to the outer bearing portion 32 as the outer peripheral edge of the molding hole 3. Is located.

  Further, the shortest distance R from the inner wall surface 55a of each metal hole 55 to the outer peripheral side bearing portion 32 on the inlet side (upstream cross section) of the forming hole 3 is formed to be substantially equal in all the metal holes 55. Has been.

  Here, in the present embodiment, when the longest shortest distance is “Rmax” and the shortest shortest distance is “Rmin” among the shortest distances R of each metal hole 55... ((Rmax−Rmin) / Rmax). ] × 100 is adjusted to 10 (%) or less, the shortest distance R for each metal hole 55 is assumed to be substantially equal. In addition, when this value (variation of the shortest distance R) is too large, good flow characteristics described later cannot be obtained, and there is a possibility that a high-quality shape product cannot be manufactured.

  In the present embodiment, the areas (cross-sectional areas) A of the metal holes 55 are substantially equal to each other in the front view state.

  Here, in the present embodiment, [Amax−Amin) / Amax] × 100 is 15 when the largest area is “Amax” and the smallest area is “Amin” among the areas A of the respective metal holes 55. When adjusted below, the area A of each metal hole 55 is assumed to be equal to each other. In addition, when this value (the variation of the area B) is too large, there is a possibility that good flow characteristics described later cannot be obtained.

  In FIG. 9, L53 indicates the center line of the bridge 53 (the same applies to FIGS. 10A and 10B below).

  Next, in the extrusion die 1 of the present embodiment, the size, shape, mutual positional relationship and the like of the forming hole 3, the bridge 53, and the metal hole 55 are determined according to the following procedure.

  First, the number of bridges 53 (metal holes 55) is determined in accordance with the cross-sectional shape of the semi-hollow shape member 8 (the front shape of the molding hole 3). Usually, when the molding hole 3 has a polygonal shape, it is preferable to arrange the bridges 53 at the corners of the molding hole 3, so the number of corners of the molding hole 3, the shape of the molding hole 3 itself, and the overall balance The number of bridges 53 is determined in consideration of the above. In the present embodiment, as shown in FIG. 10A, the number of bridges 53 is set to 6, and they are arranged at equal intervals in the circumferential direction.

  Subsequently, the width and width of the bridge 53 are appropriately determined in consideration of the extrusion load (strength) and the position and shape of the inner edge (inner wall surface 55a) of the metal hole 55 are determined. That is, as shown in FIG. 10B, the inner edge portion (inner wall surface 55a) of each metal hole 55 is positioned outside the outer peripheral edge portion (outer peripheral side bearing portion 32) of the molding hole 3, and the outer periphery from each inner wall surface 55a. The position and shape of the inner wall surface 55a of each metal hole 55 are determined so that each shortest distance R to the bearing portion 32 is substantially equal for each metal hole 55.

  Next, the position and shape of the outer edge (outer wall surface 55b) of each metal hole 55 are determined so that the areas of the metal holes 55 are substantially equal to each other. This determination method will be specifically described as follows.

  First, assuming that the front shape (cross-sectional shape) of the reference metal hole 55 is as shown in FIG. 11A, for example, when reducing the area of the reference metal hole 55, as shown in FIG. 11B, The area of the metal hole 55 can be reduced by changing the position of the outer edge 55b from the reference state shown by the broken line in the figure to the state of the solid line in the figure, and conversely, If the position of the outer edge 55b is changed to the outer side, the area of the metal hole 55 can be increased.

  Further, as shown in FIG. 11C, the radius of curvature at the corner portion between the outer edge 55b of the metal hole 55 and the bridge wall surfaces 55c and 55c is changed from the reference state shown by the broken line in FIG. In this case, the area of the metal hole 55 can be reduced without changing the position of the outer edge 55b. Conversely, if the radius of curvature is reduced, the position of the outer edge 55b is changed. In addition, the area of the metal hole 55 can be increased.

  Therefore, in order to increase the area of any metal hole 55, the position of the outer edge 55b may be changed to the outside, or the radius of curvature of the corners at both ends of the outer edge 55b may be reduced. Conversely, when it is desired to reduce the area, the position of the outer edge 55b may be changed to the inside, or the radius of curvature at both ends of the outer edge 55b may be increased. Thus, by changing the area of the appropriate metal hole 55, the area of each metal hole 55 is adjusted to be substantially equal to each other.

  The extrusion die 1 of the present embodiment configured as described above is held via a die holder (not shown) on the downstream side of the container 11 in the extrusion apparatus 10 as shown in FIG.

  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 flows from the metal hole 55 of the hall plate 5 to the weld chamber 51, and is further molded from the weld chamber 51 through the molding hole 3. Thereby, the semi-hollow shape member 8 shown in FIG. 8 having a shape corresponding to the molding hole 3 is manufactured.

  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 not fixed to the tongue part molding part 22. Therefore, the extrusion load applied to the dummy molding part 6 at the time of extrusion is not supported by the tongue part molding part 22 but is supported only by the bridge 53.

  According to the extrusion processing apparatus 10 of the present embodiment, since the dummy molding part 6 is arranged on the upstream side of the tongue part molding part 22 in the die body 2, the extruded material 81 is the outer periphery of the dummy molding part 6 during the extrusion process. By flowing on the side, the extruded material 81 does not come into pressure contact with the central part (main part) of the tongue part molding part 22 and the extrusion load acting on 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 can be improved.

  Further, in the present embodiment, since the dummy molding portion 6 is separated from the tongue portion molding portion 22, the hole plate 5 is bent by the pushing load, and the dummy molding portion 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, and the durability can be further improved.

  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, 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. It passes through the molding hole 3 and can be reliably prevented from entering the gap 20 between the dummy molding part 6 and the tongue part molding part 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.

  Further, in the present embodiment, since the bearing portions that determine the product shape, such as the inner peripheral bearing portion 31 and the outer peripheral bearing portion 32, are formed only on the die body 2 side, The semi-hollow shape member 8 is superior in dimensional accuracy compared to the case where the peripheral bearing portion and the outer peripheral bearing portion are formed to be dispersed in a male mold (hole plate) and a female mold (port plate). Can be manufactured.

  In other words, when the bearing parts are dispersed in male and female dies, the dimensional accuracy and shape of each bearing part are maintained and managed, for example, adjustment of the positional relationship between the inner and outer bearing parts (bearing Width adjustment) becomes troublesome, and high dimensional accuracy cannot be maintained, and it may be difficult to manufacture a high-quality semi-hollow shape member.

  On the other hand, in this embodiment, since the bearing parts 31 and 32 are concentrated on the die body 2 side, the dimensional accuracy and shape of each bearing part 31 and 32 such as position adjustment between the bearing parts 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.

  Moreover, in the extrusion die 1 of this embodiment, since the shortest distance R from each inner edge 55a of each metal hole 55 to the outer peripheral edge 32 of the molding hole 3 is substantially equal in the front view state, each metal The flow rate of the molding material from the hole 55 toward the molding hole 3 becomes substantially uniform, and the molding material passes through the entire area of the molding hole 3 at a substantially uniform flow rate. Since good flow characteristics can be obtained in this way, it is possible to prevent problems such as twisting in the shape product, and to reliably manufacture a high-quality semi-hollow shape material.

  Furthermore, in the present embodiment, since the areas of the metal holes 55 are substantially equal to each other, the molding material is introduced evenly distributed in the metal holes 55 and the flow velocity is equal in the metal holes 55. In this respect, it is possible to prevent a variation in the flow rate of the molding material in the molding hole 3 from this point as well. Can do. Therefore, the flow characteristics of the molding material can be further improved, and a high-quality semi-hollow shape material free from problems such as twisting can be more reliably produced.

  Note that the present invention is not limited to the above-described embodiments and modifications, and can be variously modified without departing from the gist of the present invention.

  Moreover, in the said embodiment, although aluminum was mentioned and mentioned as an example as a material of an extrusion material (semi-hollow shape material), not only that but metal other than aluminum can also be used for this invention.

  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 present invention, the shape of the forming hole (cross-sectional shape of the shape product) is not limited to that of the above-described embodiment, and any shape can be used as long as it has a non-axisymmetric shape that is not a line-symmetric shape. Can also be applied.

  In particular, the present invention can be suitably applied to an extrusion die having a substantially polygonal shaped hole having three or more corner portions. Furthermore, when the present invention is applied to an extrusion die having a forming hole having a corner portion, it is preferable to arrange a bridge so as to correspond to each corner portion of the forming hole as in the above embodiment.

  Moreover, in the said embodiment, although the position of the inner edge part 55a of each metal hole 55 is arrange | positioned outside with respect to the outer-periphery edge part 32 of the shaping | molding hole 3 in a front view state, it is not restricted only to it. In this case, the position of the inner edge of each metal hole may coincide with the outer peripheral edge of the forming hole. Needless to say, in this case, the shortest distance from the inner edge of the metal hole to the outer peripheral edge of the forming hole is “0”.

  Moreover, in the said embodiment, although the dummy shaping | molding part 6 and the tongue part shaping | molding part 22 are arrange | positioned in the state spaced apart, it is not restricted to it, In this invention, the downstream end surface of the dummy shaping | molding part 6 and a tongue part You may arrange | position in the state which contacted the upstream end surface of the shaping | molding part 22. FIG.

  In the above embodiment, a solid die type extrusion die provided with bearing portions 31 and 32 on the die body 1 side has been described as an example. However, the present invention is not limited to this, and in the present invention, the hole plate has a male plate. The present invention can also be applied to a semi-hollow type extrusion die in which a die die (inner peripheral side bearing portion) is provided and a die die (port plate) is provided with a female die (outer peripheral side bearing portion).

  In the above-described embodiment, the extrusion die in which the weld chamber 51 is provided on the hole plate 5 has been described as an example. However, the present invention is not limited thereto, and in the present invention, the weld chamber may be formed on the die body side. Further, it may be formed so as to straddle both the hole plate and the die body. In short, the weld chamber may be provided in at least one of the hole plate and the die body.

  The present invention is applicable to an extrusion die used when producing a semi-hollow profile by extrusion.

1: Extrusion die 10: Extrusion device 2: Die body 22: Tongue forming part 23: Tongue opening forming part 3: Molding hole 32: Outer peripheral side bearing part (outer peripheral edge part)
5: Hall plate 50: Axial part 51: Weld chamber 53: Bridge 55: Metal hole 55a: Inner wall surface (inner edge)
55b: Outer wall surface (outer edge)
55c: Bridge wall surface 6: Dummy forming part 8: Semi-hollow shape member 81: Extruded material 82: Tongue part 83: Tongue opening A, Amax, Amin: Metal hole area R, Rmax, Rmin: Shortest distance

Claims (9)

A forming hole for forming a semi-hollow shape member having a non-symmetrical cross section, a tong portion forming portion for forming a tong portion of the semi-hollow shape member, and a tong opening forming portion for forming a tong opening portion of the semi-hollow shape member And a weld chamber provided on the upstream side of the forming hole, and a metal hole penetrating in the extrusion direction from the upstream side to the weld chamber and provided in a plurality at intervals in the circumferential direction. An extrusion die for producing a semi-hollow shape member, comprising a plurality of bridges respectively provided between metal holes, wherein the molding material introduced from the plurality of metal holes passes through the molding hole through the weld chamber. There,
In the front view state seen along the extrusion direction from the upstream side, each inner edge portion on the inner peripheral surface of each metal hole is disposed at the same position or outer side with respect to the outer peripheral edge portion of the molding hole,
In the front view state, the shortest distance from each inner edge of each metal hole to the outer peripheral edge of the molding hole is substantially equal,
In the front view state, each metal hole is formed so that the areas of each other are substantially equal ,
The die body and the hole plate provided on the upstream side are provided separately,
The molding hole, the tongue part molding part, and the tongue opening part molding part are provided in the die body,
An extrusion die for producing a semi-hollow shape material , wherein the weld chamber, the metal hole, and the bridge are provided in the hole plate .   The maximum distance among the shortest distances is “Rmax” and the minimum distance is “Rmin”, and [(Rmax−Rmin) / Rmax] × 100 is adjusted to 10 (%) or less. An extrusion die for producing a semi-hollow mold material as described.   The area of each metal hole is adjusted such that [(Amax−Amin) / Amax] × 100 is 15 (%) or less, where “Amax” is the maximum area and “Amin” is the minimum area. 3. An extrusion die for producing a semi-hollow profile according to 1 or 2. The inner peripheral surface of the metal hole has an inner wall surface, an outer wall surface and a bridge wall surface,
The extrusion die for producing a semi-hollow shape member according to any one of claims 1 to 3, wherein a radius of curvature between the outer wall surface and the bridge wall surface in any one of the metal holes is different from that of the other metal hole. The semi-hollow shape member according to any one of claims 1 to 4 , wherein a dummy forming portion is provided in the weld chamber of the hole plate corresponding to an upstream side of the tong portion forming portion of the die body. Extrusion dies for manufacturing. 6. The extrusion die for producing a semi-hollow shape member according to claim 5 , 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 claim 5 or 6 , wherein the dummy molding part is arranged in a state of being separated from the tongue part molding part. An apparatus for producing a semi-hollow profile comprising an extrusion die for producing a semi-hollow profile by extruding an extruded material,
The extrusion die, be constituted by a semi-hollow material for manufacturing an extrusion die apparatus for producing a semi-hollow profile, wherein according to any one of claims 1-7. A semi-hollow shape material produced by extruding an extruded material using the extrusion die for producing a semi-hollow shape material according to any one of claims 1 to 7. A method for manufacturing a profile.

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