JP5603686B2 - 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, so that a semi-hollow profile is molded.

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

  By the way, the extrusion die which has a hole plate like the holodais shown in the said patent document 2 is a state of a front view when it sees along an extrusion direction from the upstream, and usually the magnitude | size (area) of each metal hole has it. Is different.

  In other words, when determining the size of each metal hole in a conventional holodais, according to the number of metal holes installed, the molding holes are equally divided in the circumferential direction, and are matched to the area of each division part of the molding holes. The size of each metal hole was determined. Here, since the tong opening forming part of the forming hole is closed, among the divided parts of the forming hole, the divided part including the closed part (closed part) is compared with the divided part not including the closed part. The area is getting smaller. Therefore, the area of the metal hole corresponding to the segmented portion including the blocking portion is set smaller than that of the metal hole corresponding to the segmented portion not including the blocking portion.

  As described above, the area of each metal hole varies depending on the shape of the molding hole. In this case, the molding material introduced into each metal hole may vary in flow velocity for each metal hole. For this reason, the flow rate of the molding material introduced from each metal hole into each section of the molding hole varies depending on the introduction position of the molding hole, and the shape product is twisted, resulting in a high quality semi-hollow shape material. The problem that it is difficult to obtain is generated.

  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] 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, a plurality of metal holes penetrating along the extrusion direction from the upstream side to the weld chamber and spaced apart in the circumferential direction, and adjacent metal holes in the circumferential direction. A plurality of bridges provided respectively, and an extrusion die for producing a semi-hollow shape member in which a molding material introduced from the plurality of metal holes passes through the molding hole through the weld chamber,
In a front view as viewed along the extrusion direction from the upstream side, a plurality of divided portions corresponding to the respective metal holes and substantially equal to each other by the virtual dividing lines passing over the respective bridges On the other hand,
An extrusion die for producing a semi-hollow shape member, wherein each metal hole is formed so that the areas of each metal hole are substantially equal in a front view state.

  [2] In the preceding item 1, Bmax / Bmin is set to 1.2 or less, where “Bmax” is the maximum area and “Bmin” is the minimum area of each section of the forming hole. Extrusion dies for semi-hollow shape material production.

  [3] The area according to 1 or 2 above, wherein Amax / Amin is set to 1.2 or less when the maximum one is “Amax” and the minimum one is “Amin”. Extrusion dies for semi-hollow shape production.

  [4] When the area of the metal hole is “A” and the area of the section of the forming hole is “B”, the area ratio A / B of the corresponding section and metal hole is 1.1 to 300. The extrusion die for producing a semi-hollow shape material according to any one of the preceding items 1 to 3, which is set.

  [5] The extrusion die for manufacturing a semi-hollow shape material according to any one of the items 1 to 4, wherein the plurality of metal holes are arranged at approximately equal intervals in the circumferential direction.

  [6] In any one of the preceding items 1 to 5, the center of gravity of the forming hole corresponding to the center of gravity of the semi-hollow profile is arranged in a state of being displaced with respect to the axis of the extrusion die in the front view state. Extrusion dies for semi-hollow shape material production.

  [7] The extrusion die for manufacturing a semi-hollow shape member according to any one of items 1 to 6, wherein the forming hole is formed in a non-symmetrical shape in a front view state.

[8] 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,
8. The extrusion die for producing a semi-hollow shape member according to any one of the preceding items 1 to 7, wherein the weld chamber, the metal hole, and the bridge are provided on the hole plate.

  [9] The extrusion die for producing a semi-hollow shape member according to the above item 8, 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.

  [10] The extrusion die for manufacturing a semi-hollow profile according to the above item 9, wherein the dummy molding part is in an unfixed state with respect to the tongue part molding part.

[11] A portion surrounded by the plurality of metal holes in the hole plate is configured as an axial center portion,
The extrusion die for producing a semi-hollow shape material according to 9 or 10 above, wherein the dummy molding portion is provided at a downstream end portion of the shaft center portion.

  [12] The extrusion die for manufacturing a semi-hollow shape member according to any one of items 9 to 11, wherein the dummy molded part is disposed in contact with the tongue part molded part.

  [13] The extrusion die for manufacturing a semi-hollow shape member according to any one of items 9 to 11, wherein the dummy molded part is disposed in a state of being separated from the tongue part molded part.

[14] A semi-hollow shape manufacturing apparatus provided with an extrusion die for extruding an extruded material to produce a semi-hollow shape,
The said extrusion die is comprised by the extrusion die for semi-hollow shape material manufacture of any one of preceding clauses 1-13, The manufacturing apparatus of the semi-hollow shape material characterized by the above-mentioned.

  [15] 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 13 above. Semi-hollow shape manufacturing method.

  According to the extrusion die for producing a semi-hollow shape material of the invention [1], the molding material is uniformly dispersed and passed through each metal hole, flows in a balanced manner throughout the molding hole, and passes at a uniform flow rate. Thus, good flow characteristics can be obtained, and a high-quality semi-hollow shape material free from problems such as twisting can be produced.

  According to the extrusion dies for producing a semi-hollow profile of the inventions [2] to [6], the above-described effects can be obtained more reliably.

  According to the extrusion die for producing a semi-hollow profile of the invention [7], a high-quality semi-hollow profile having a non-symmetrical cross section and free from defects such as torsion can be more reliably produced. .

  According to the extrusion die for producing a semi-hollow profile of the invention [8], 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 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 member of the invention [9], since the dummy forming part is provided on the upstream side of the tongue forming part, the extruded material flows on the outer peripheral side of the dummy forming 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 profile of the invention [10], even if the hole plate is bent due to the extrusion load and the dummy molded part is displaced, the adverse effect due to the displacement is exerted on the tongue molded part. The durability can be further improved.

  According to the extrusion die for producing a semi-hollow profile of the invention [11], the dummy molded portion can be reliably formed at an appropriate position, and the above-described effect can be obtained more reliably.

  According to the extrusion die for producing a semi-hollow profile of the invention [12], since the dummy molded part is in contact with the tongue part molded part, it is ensured that the extruded material enters between the dummy molded part and the tongue part molded part. It is possible to prevent problems caused by the intrusion.

  According to the extrusion die for producing a semi-hollow shape member of the invention [13], since the gap is formed between the dummy forming portion and the tongue forming portion, 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 [14], the same effect can be obtained as described above.

  According to the semi-hollow shape manufacturing method of the invention [15], the same effect 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. 10 is a front view for explaining the positional relationship between the metal holes and the forming holes in the extrusion processing apparatus which is a modification of the present invention. FIG. 11 is a front view for explaining the positional relationship between metal holes and forming holes in an extrusion apparatus as a reference example that departs from the gist of the present invention.

  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 has a lip groove shape (lip channel shape), and has a horizontally long cross section whose horizontal dimension is longer than the vertical dimension. It 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).

  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 formed in a horizontally long substantially C-shape that is a shape corresponding to the cross-sectional shape of the semi-hollow shaped member 8 to be manufactured.

  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 rectangular shape (rectangular 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, 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 cross-sectional shape (front view shape) of the metal holes 55 is formed in a substantially quarter circle, and four metal holes 55 are formed at approximately equal intervals in the circumferential direction.

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

  A region between each of the four 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 four metal holes 55 in the hall plate 5 is configured as an axial center portion 50 disposed along the axial center. The downstream end of the axial center 50 is provided with a protrusion 61 that protrudes in the downstream direction, and the tip (downstream end) of the protrusion 61 has a rectangular shape in the rear view. It is formed as a dummy molding part 6. 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 (rear surface shape) of the dummy molding portion 6 corresponds to the cross-sectional shape (front surface shape) of the tongue portion molding portion 22 of the die body 2 and is substantially rectangular (rectangular) with a large curvature radius at the corner. Is formed.

  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 extrusion die 1 of the present embodiment, as shown in FIG. 9, the center of gravity (product center of gravity) X3 of the molding material (semi-hollow profile) passing through the molding hole 3 is the axis of the extrusion die 1 in the front view state. The position is shifted from the center X1.

  If it demonstrates in detail, in the extrusion die 1 of this embodiment, the magnitude | size, mutual positional relationship, etc. of the shaping | molding hole 3, the bridge | bridging 53, and the metal hole 55 will be determined according to the following procedures.

  First, the number of metal holes 55 (bridges 53) is determined according to the cross-sectional shape of the semi-hollow shape member (the front shape of the forming hole 3). For example, in the case of a polygonal molding hole 3 provided with a plurality of corner portions, the number of bridges 53 (metal holes 55) is set to be equal to the number of corner portions of the molding hole 3. In the present embodiment, since the molding hole 3 has a substantially square shape and four corner portions are provided, the number of bridges and the number of metal holes are each four.

  Further, in the front view state, the positional relationship between the molding hole 3 and the position of the bridge 53 is set so that the bridge 53 is arranged corresponding to each corner portion of the molding hole 3. Needless to say, the metal hole 55 is provided correspondingly between the adjacent bridges 53 and 53.

  Furthermore, in the front view state, the molding hole 3 is divided into four divided portions 3b having substantially the same area (cross-sectional area) along the circumferential direction by a virtual dividing line La passing on the center line of the bridge 53.

  In other words, among the four divided portions 3b of the forming hole 3 divided by the divided straight line La, the area of the divided portion 3b located on the right side is “B1” and is located on the lower center side in the plane of FIG. Area B1, B2, B3, the area of the segment 3b located on the left side is "B3", and the area of the segment 3b located above the center is "B4". , B4 are set substantially equal to each other (substantially equal).

  Further, in the front view state, the metal holes 55 arranged between the bridges 53, that is, corresponding to the respective divided portions 3 b of the forming holes 3, are formed so that their respective areas (each sectional area) are equal to each other. .

  In other words, among the four metal holes 55, the area of the metal hole 55 located on the right side is “A1” and the area of the metal hole 55 located on the lower side of the center is “A2” toward the paper surface of FIG. When the area of the metal hole 55 located on the left side is “A3” and the area of the metal hole 55 located on the upper center is “A4”, the areas A1, A2, A3, A4 are substantially equal to each other (substantially equal). ) Is set.

  Since the area A1 to A4 of each metal hole 55 is equal to the area B1 to B4 of each segmented portion 3b, the area ratio A1 / B1, A2 / B2, A3 / of each metal hole 55 to each segmented portion 3b. B3, A4 / B4 are also set substantially equal (substantially equal) to each other.

  Expressed mathematically, in the extrusion die 1 of the present embodiment, the size and positional relationship of the forming hole 3 and the metal hole 55 are set so that the following relational expressions (1) to (3) are established. It is.

A1≈A2≈A3≈A4 (1)
B1≈B2≈B3≈B4 (2)
A1 / B1≈A2 / B2≈A3 / B3≈A4 / B4 (3)

  Here, in the present invention, when the maximum one of the areas A1 to A4 of each metal hole 55 is “Amax” and the minimum one is “Amin”, and Amax / Amin is 1.2 or less, The areas A1 to A4 are substantially equal to each other. In this embodiment, even if the precision of the mold is set higher than necessary, it is not possible to obtain a sufficient effect and conversely increase the manufacturing cost. Therefore, Amax / Amin is: It is preferable to set it to 1.005 or more.

  Further, among the areas B1 to B4 of the respective divided portions 3b of the forming hole 3, when the maximum one is “Bmax” and the minimum one is “Bmin”, when Bmax / Bmin is 1.2 or less, The areas B1 to B4 are substantially equal to each other. It should be noted that the Bmax / Bmin is preferably set to 1.005 or more in order to avoid an increase in manufacturing cost for ensuring the accuracy of the mold, as described above.

  In the present embodiment, the area ratios A1 / B1, A2 / B2, A3 / B3, and A4 / B4 of the respective metal holes 55 with respect to the respective divided portions 3b are set to 1.1 to 300 in any of the area ratios A / B. Is good.

  That is, when the areas A1 to A4 are not equal, when B1 to B4 are not equal, or when the area ratio A / B deviates from the above specific range, in the flow of the molding material (metal flow), good flow described later The properties cannot be obtained, and it may be difficult to obtain a high-quality profile product.

  In the present embodiment, it is preferable to satisfy the relationship of (A1 + A2 + A3 + A4)> (B1 + B2 + B3 + B4), and more preferably, all of the relationships of A1> B1, A2> B2, A3> B3 and A4> B4 are satisfied. good. That is, when this relationship is not satisfied, a sufficient material is not supplied to the molding hole 3, and depending on the cross-sectional shape of the shape, there is a risk of lack of thickness, which is not preferable.

  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.

  On the other hand, in the extrusion die 1 according to the present embodiment, as shown in FIG. 9, the molding hole 3 is divided into divided portions 3b having the same area, and each metal hole 55 corresponding to each divided portion 3b is formed. Since the areas A1 to A4 are set equal to each other, the molding material in the container 11 is introduced evenly distributed in each metal hole 55 and passes through each metal hole 55 at an equal flow rate.

  Furthermore, in this embodiment, since the area ratios A1 / B1, A2 / B2, A3 / B3, and A4 / B4 of the metal holes 55 with respect to the respective divided portions 3b of the molding hole 3 are also equal, the molding material is each metal. It is possible to effectively prevent a variation in the flow rate of the molding material from flowing from the hole 55 to the entire area of the molding hole 3 in a balanced manner. Thus, since the molding material passes through the entire area of the molding hole 3 at a constant speed, good flow characteristics can be obtained, and a high-quality semi-hollow shape material without twist can be manufactured.

  For reference, the size and positional relationship between the forming hole and the metal hole in a conventional holrodice or the like will be described below.

  That is, as shown in FIG. 11, in the conventional holrodice, the center of gravity (product centroid) X3 of the forming hole 3 coincides with the axis X1 of the die in the front view state. Is divided into four in the circumferential direction by a virtual dividing straight line La passing through the center of the metal, and the size of the metal hole 55 is set in accordance with the size of each dividing portion 3b. Here, in the conventional holrodice, when the molding hole 3 is divided, the molding hole 3 is simply divided into four in the circumferential direction. Therefore, the areas B1 to B4 of the respective divided portions 3b of the molding hole 3 are equal to each other. There is nothing. For example, the area B1 of the section 3b having the tongue opening molding portion 23 is smaller than the areas B2 to B4 of the section 3b not having the tongue opening molding section 23.

  In the prior art, the area ratios A1 / B1, A2 / B2, A3 / B3, A4 / B4 of the areas A1 to A4 of the metal holes 55 to the areas B1 to B4 of the divided portions 3b of the molding hole 3 are equal. Thus, the size (area A1 to A4) of each metal hole 55 is set. For this reason, the area A1 of the metal hole 55 arranged corresponding to the segmented portion 3b where the tongue opening forming part 23 is located is set smaller than the areas A2 to A4 of the metal hole 55 corresponding to the other segmented portion 3b. Will be.

  Thus, in a conventional extrusion die such as a holodais, the forming hole 3 is simply divided in the circumferential direction, and the size of each metal hole 55 is determined in accordance with the size of each divided portion 3b. Therefore, the size of each metal hole 55 is different.

  For this reason, in a conventional extrusion die such as a holrodice, the molding material is not evenly dispersed and introduced into each metal hole 55 and may pass through each metal hole 55 at a different flow rate. The molding material is introduced into the molding hole 3 at a flow rate. Therefore, the flow rate of the molding material varies depending on the position where the molding hole 3 is introduced, and it becomes difficult to obtain good flow characteristics as in this embodiment. As a result, a harmful twist occurs in the profile product, making it difficult to obtain a high-quality profile product.

  In the conventional extrusion die, it is difficult to obtain good flow characteristics even if the sizes of the metal holes 55 are equal.

  That is, in the conventional extrusion die shown in FIG. 11, since the areas B1 to B4 of the divided portions 3b of the molded holes 3 to be divided are different, even if the size (area) of each metal hole 55 is set equal, The area ratios A1 / B1, A2 / B2, A3 / B3, A4 / B4 of the metal holes 55 with respect to the respective divided portions 3b are different. For this reason, when the molding material flows into the molding hole 3 from each metal hole 55, the flow rate of the molding material varies depending on the inflow position of the molding hole 3. Therefore, good flow characteristics cannot be obtained, and a harmful twist occurs in the shape product, resulting in a decrease in product quality.

  On the other hand, in the extrusion die 1 of the present embodiment, as described above, it is possible to obtain good flow characteristics with no variation in the flow rate of the molding material regardless of the introduction position of the molding hole 3, and there is no twist. A high-quality hollow profile can be produced.

  FIG. 10 is a front view showing the positional relationship between the forming hole 3 and the metal hole 55 in the extrusion die 1 which is a modification of the present invention.

  As shown in the figure, the extrusion die 1 is formed in a shape (non-axisymmetric shape) that is not line-symmetric when the forming hole 3 is in a front view state, 3 is formed in a non-axisymmetric sectional shape corresponding to 3 (an irregular sectional shape).

  Also in the extrusion die 1 of this modification, the size and positional relationship of the extrusion hole 3 and the metal hole 55 are set as in the above embodiment.

  That is, in the front view state, the forming hole 3 is caused to correspond to the four metal holes 55 by the virtual dividing line La passing through the center line of each bridge 53 arranged corresponding to each corner portion of the extrusion hole 3. It is divided into four in the direction. At the time of this division, similarly to the above-described embodiment, the areas B1 to B4 of the respective divided portions 3b are adjusted to be substantially equal. Further, the areas A1 to A4 of each metal hole 55 are set to be substantially equal. Thereby, the area ratios A1 / B1, A2 / B2, A3 / B3, A4 / B4 of the metal holes 55 with respect to the respective divided portions 3b are also set to be substantially equal.

  Also in the extrusion die 1 of this modified example, the product gravity center X3 is arranged with its position shifted from the axis X1 of the extrusion die 1 in the front view state, as in the above embodiment.

  Moreover, in this modification, since the other structure is the same as that of the said embodiment, the same code | symbol is attached | subjected to the same or an equivalent part, and duplication description is abbreviate | omitted.

  In the extrusion die 1 of this modified example, the shape of each segmented portion 3b of the molding hole 3 is different, but the areas B1 to B4 of each segmented portion 3b are set to be substantially equal, and each corresponding to each segmented portion 3b. Since the areas A1 to A4 of the metal holes 55 are also set to be approximately equal, when the molding material is introduced from each metal hole 55 into the molding hole 3 as in the above embodiment, the molding material regardless of the introduction position. Therefore, good flow characteristics can be obtained, and a high-quality profile product free from defects such as torsion can be produced.

  In addition to this, in this modified example, the same operational effects can be obtained as in the above embodiment.

  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.

  Further, in the present invention, the shape of the forming hole (cross-sectional shape of the shape product) is not limited to the above-described embodiment, and any shape can 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 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 part molding part 23: Tongue opening molding part 3: Molding hole 3b: Separation part 5: Hole plate 50: Axial part 51: Weld chamber 53: Bridge 55: Metal hole 6: Dummy forming part 8: Semi-hollow shape member 81: Extruded material 82: Tongue part 83: Tongue opening parts A, A1 to A4, Amax, Amin: Areas B, B1 to B4, Bmax of the divided parts Bmin: Metal hole area E: Extrusion direction La: Dividing line (dividing line)
X1: Axis X3: Product center of gravity (center of formation hole)

Claims (14)

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, a plurality of metal holes penetrating along the extrusion direction from the upstream side to the weld chamber and spaced apart in the circumferential direction, and a metal hole adjacent in the circumferential direction. An extrusion die for producing a semi-hollow shape member comprising a plurality of bridges, wherein the molding material introduced from the plurality of metal holes passes through the molding hole via the weld chamber,
In a front view as viewed along the extrusion direction from the upstream side, a plurality of divided portions corresponding to the respective metal holes and substantially equal to each other by the virtual dividing lines passing over the respective bridges On the other hand,
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 .   2. The half according to claim 1, wherein Bmax / Bmin is set to be 1.2 or less, where “Bmax” is the maximum area and “Bmin” is the minimum area of each section of the forming hole. Extrusion dies for hollow profile production.   The semi-hollow according to claim 1 or 2, wherein Amax / Amin is set to 1.2 or less, where "Amax" is the maximum area and "Amin" is the minimum area of each metal hole. Extrusion dies for shape production.   When the area of the metal hole is “A” and the area of the section of the forming hole is “B”, the area ratio A / B of the corresponding section and metal hole is set to 1.1 to 300. The extrusion die for producing a semi-hollow shape member according to any one of claims 1 to 3.   The extrusion die for producing a semi-hollow shape member according to any one of claims 1 to 4, wherein the plurality of metal holes are arranged at substantially equal intervals in the circumferential direction.   6. The half according to claim 1, wherein the center of gravity of the molding hole corresponding to the center of gravity of the semi-hollow profile is arranged in a position shifted with respect to the axis of the extrusion die in a front view state. Extrusion dies for hollow profile production.   The extrusion die for producing a semi-hollow shape member according to any one of claims 1 to 6, wherein the forming hole is formed in a non-axisymmetric shape in a front view state. The semi-hollow shape member according to any one of claims 1 to 7 , wherein a dummy molding portion is provided in the weld chamber of the hole plate, corresponding to the upstream side of the tongue portion molding portion of the die body. Extrusion dies for manufacturing. The extrusion die for producing a semi-hollow shape member according to claim 8 , wherein the dummy molding part is in an unfixed state with respect to the tongue part molding part. A portion surrounded by the plurality of metal holes in the hole plate is configured as an axial center portion,
The extrusion die for producing a semi-hollow shape member according to claim 8 or 9 , wherein the dummy forming portion is provided at a downstream end portion of the shaft center portion. The extrusion die for producing a semi-hollow shape member according to any one of claims 8 to 10 , wherein the dummy molded portion is disposed in contact with the tongue portion molded portion. The extrusion die for producing a semi-hollow shape member according to any one of claims 8 to 10 , 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, according to claim 1 to 12 being constituted by the semi-hollow material for manufacturing an extrusion die apparatus for producing a semi-hollow profile, wherein according to any one of. A semi-hollow shape material is 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 12. A method for manufacturing a profile.

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