JP3769834B2 - Die for extrusion molding and extrusion molding method for variable thickness tubular member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention integrates a tubular member whose thickness varies along the longitudinal direction with a molding material such as aluminum, and in particular, a variable thickness tubular member whose thickness varies along the longitudinal direction while deflecting in the circumferential direction. The present invention relates to a die for extrusion molding that can be molded and a method for molding a thick tubular member using the same.
[0002]
[Prior art]
In recent years, in industrial machinery, equipment, or various vehicles, it is excellent in weight reduction, durability improvement, recyclability, etc., so as a tubular member for transporting various fluids such as lubricating oil and fuel, it is made of conventional iron or copper Instead of those, those made of aluminum or aluminum alloys are being used frequently.
By the way, normally, in manufacturing such various tubular members, extrusion is employed because the melting point of aluminum as a raw material is low. In this extrusion process, an extrusion die having a hole with a cross-sectional shape having a hollow portion of the tubular member is fixed to the tip of the container, a heated material (billet) is inserted into the container, and the billet is added. The tubular member is formed by pressing toward the extrusion die with a pressure machine (stem) and extruding from the hole. Incidentally, according to this extrusion process, since the hole of the extrusion die has a constant cross-sectional shape, the obtained tubular member is also formed with a constant thickness in the longitudinal direction.
[0003]
[Problems to be solved by the invention]
However, the above tubular member is long because it is necessary to transport a fluid over a relatively long distance, and in order to ensure strength, the tubular member is held by a fixed member at predetermined intervals, and a support such as a wall portion. It is necessary to fix to. In this case, the thickness of the tubular member is a dimension necessary for transporting the fluid, and is a dimension sufficient to support a short distance, but a dimension that can withstand the moment stress generated in the long distance. It is not. Such dimension setting is in accordance with a structural mechanical and economic appropriate scale. Therefore, if the tubular member is strongly gripped by the fixing member, the tubular member may be damaged. Therefore, the gripping portion of the tubular member must be reinforced and fixed through the gripping member.
[0004]
In addition, the tubular member not only simply transports the fluid from one to the other, but also has other diameters of various diameters in the middle portion for the purpose of branching or joining the flow path. Need to be connected. Even in such a case, the thickness of the conventional tubular member is uniform and is not set to a dimension that is thick enough to give sufficient strength such as tapping to connect the pipes. However, there is a problem that the reinforcing member must be reinforced.
Thus, in the conventional tubular member, when gripping and fixing the tubular member, and when connecting another tubular member to the tubular member, the corresponding part must be reinforced, There is a problem that the number of parts and the number of manufacturing steps increase, and thus the total cost from forming to laying the tubular member increases.
[0005]
The present invention has been made to effectively solve the problems of the conventional tubular member described above, and is integrally formed with a variable thickness tubular member in which a thick portion is integrally formed on the outer surface of a portion requiring reinforcement. It is an object of the present invention to provide an extrusion die that can be extruded and a method for extrusion of a variable thickness tubular member using the same.
[0006]
[Means for Solving the Problems]
The extrusion molding die according to the first aspect of the present invention is located on at least one side orthogonal to the first and second wall portions that are opposed to each other about the axis. The third wall portion is a die for integrally extruding a wall thickness variable tubular member that is formed intermittently thick in the longitudinal direction, and forms a hollow portion of the tubular member. A first fixed die having a molded end and a fixed molded hole are provided in the center, and the fixed molded hole faces the periphery of the molded end of the first fixed die to regulate the maximum thickness of the tubular member. A second fixed die, and a movable forming hole at substantially the center, and the first and second opposing fixed forming holes of the second fixed die are opposed to the second fixed die. A first moving die mounted so as to be slidable along the direction connecting the inner edges; With respect to the second stationary die, said to be orthogonal to the sliding direction of the first moving die 15, the first towards the molding end of the stationary die retractable mounted to have the second A moving die of the first moving die, the dimension between the opposing inner edges is the width dimension of the molding end of the first fixed die + the minimum thickness dimension of the tubular member + The tubular member has a maximum wall thickness.
[0007]
The invention according to claim 2 is the extrusion die according to claim 1, wherein the forming symmetrical tubular member is a rectangular tube, the outer peripheral shape of the first fixed die, the fixed forming hole, and the movement the shape of the molded hole is characterized in that it is formed in a rectangular.
[0008]
Furthermore, the extrusion molding method of the wall thickness variable tubular member according to claim 3 of the present invention uses the extrusion die according to claim 1 or 2 to extrude the molding material toward the die, and The first moving die is reciprocally slid relative to the fixed die, and first and second thick portions are alternately formed on the opposing outer surfaces of the extruded tubular member, and the second moving die is The third thick portion is intermittently formed on the outer surface perpendicular to the first and second thick portions of the tubular member to be pushed out and projected toward the first fixed die. Furthermore, the invention according to claim 4 is characterized in that the molding material is aluminum or an aluminum alloy. Furthermore, the invention described in claim 5 is characterized in that the variable thickness tubular member described in claim 3 or 4 is an industrial fluid pipe or a branch pipe thereof.
[0009]
According to the extrusion molding die according to claim 1 or 2 , and the extrusion molding method of the wall thickness variable tubular member according to any one of claims 3 to 5 of the present invention using the die, the axis is centered. The first and second wall portions that are opposed to each other in the circumferential direction and the third wall portion that is spaced apart at least in one direction orthogonal to the wall portions are intermittently thick in the longitudinal direction. The thickness variable tubular member formed in the above can be easily extruded integrally. As a result, it is possible to easily and inexpensively support the tubular member that transports the fluid over a long distance, and to connect the other tubular member to the tubular member easily and inexpensively.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1 to 7 are diagrams for explaining an embodiment of an extrusion die according to the present invention. FIG. 1 shows an example of a variable thickness tubular member formed by the extrusion die. is there.
This variable thickness tubular member 1 is a tubular body having a rectangular shape inside, and is integrally extruded with aluminum. In the present embodiment, a case where the inside is applied to a rectangular tube will be described below, but the present invention can be similarly applied to a tube having a circular inside.
Two wall portions that are positioned opposite to each other in the circumferential direction around the axis of the tubular member 1, that is, the first wall portion 2 and the second wall portion 3 that face each other, and these wall portions 2 and 3. The third wall portion 4 on the one side orthogonal to is formed thickly intermittently along the longitudinal direction. Hereinafter, these thick portions are referred to as thick portions 2a, 3a, and 4a, respectively. In the tubular member 1, the fourth wall 5 opposite to the third wall 4 is formed with a uniform thickness in the longitudinal direction.
[0011]
FIG. 2 is a side sectional view of a die for integrally extruding the variable thickness tubular member 1. The extrusion die includes a first fixed die 11 having a rectangular shaped end 10 that forms the rectangular hollow portion 1 a of the tubular member 1, and a horizontal shape of the rectangular shaped end 10 of the first fixed die 11. There is a second fixed die 13 for which the fixed molding hole 12 is desired so as to surround the molding end 10 around the direction, and a movable molding hole 14 at substantially the center, and the movable molding hole 14 is fixed. With respect to the second fixed die 13, the first movable die 15 inserted so as to be reciprocally slidable and the second fixed die 13 so as to substantially coincide with the molding hole 12. The second moving die 16 is inserted into the first end of the first fixed die 11 so as to be able to protrude and retract so as to be orthogonal to the sliding direction of the first moving die 15. These are shaped by hot work tool steel It is.
[0012]
In the present embodiment, the first fixed die 11 is an octagonal thick plate-like block material, the center of the back surface of the block hangs down in a tapered shape, and a bearing portion is formed at the outer edge of the four corners. It is the end 10. The drooping portion is initially shaped so as to start drooping into a truncated cone shape and suddenly becomes a columnar shape as it goes to the tip.
On the other hand, the second fixed die 13 is an octagonal block material that is significantly thicker than the first fixed die 11, and a fixed molding hole 12 is formed at the center thereof. The fixed molding hole 12 is a molding hole which is desired around the horizontal direction of the molding end 10 and defines the maximum wall thickness of the tubular member 1 which is a target molded body. As shown in FIG. 4, the fixed molding hole 12 has a rectangular T shape, and the inner edge is a bearing portion. An inclined surface 17 is formed so as to increase in diameter from the rectangular fixed molding hole 12 toward the upper opening, and the first fixed die 11 is fitted on the second fixed die 13. When this is done, a molding material supply port 18 for guiding the heat molding material is formed between the hanging portion reaching the molding end 10 and the inclined surface 17 above the fixed molding hole 12. A heat molding material is pumped to the supply port 18 via a supply path from a molding material heating and pressing machine (not shown).
[0013]
In the rectangular T-shaped fixed molding hole 12, the opposing inner edges 12 a and 12 b in the direction corresponding to the T-shaped arm portion are separated from the molding end 10 by the maximum wall thickness of the tubular member 1, respectively. Yes. One inner edge 12c in the direction connecting these inner edges 12a and 12b, that is, one of the two directions orthogonal to the arm direction, is the minimum wall thickness of the tubular member 1 from the molded end 10, that is, the fourth wall portion 5. Separated by uniform wall thickness. Further, the other of the two directions orthogonal to the arm direction of the fixed molding hole 12, the inner edge 12d is constituted by a tip bearing portion 16a of the second moving die 16, as will be described in detail later. The tip bearing portion 16a can be moved into and out of the fixed molding hole 12. At the position where the tip bearing portion 16a protrudes most into the fixed molding hole 12, the distance between the inner edge 12d determined by the bearing portion 16a and the molding end 10 is the minimum thickness dimension. On the contrary, at the position where the tip bearing portion 16a is pulled down most from the inside of the fixed molding hole 12, the distance between the inner edge 12d determined by the bearing portion 16a and the molding end 10 becomes the maximum thickness dimension. Yes.
[0014]
Here, in order to make the second moving die 16 appear and disappear, the inner edge 12d side of the fixed molding hole 12 is a slide having a T-shaped cross section formed in the horizontal direction as shown in FIGS. It is a moving hole 19.
As shown in FIG. 2, the lower portion of the fixed molding hole 12 penetrates in the arm direction of the flat T-shaped fixed molding hole 12, that is, in the direction perpendicular to the inner edges 12 a and 12 b, A sliding groove 20 having a T-shaped cross section that opens downward is formed, and the first moving die 15 is slidably inserted into the sliding groove 20.
[0015]
As shown in FIG. 5, the first moving die 15 is exposed to a sliding portion 21 having a T-shaped cross section inserted into the sliding groove 20 and the outside of the sliding groove 20. It is an integrally formed body comprising a connecting portion 22 connected to a sliding drive device. A planar square through-hole 23 that is perpendicular to the longitudinal direction is formed in substantially the center of the sliding section 21 having a T-shaped cross section. A bearing portion is formed on the inner edge of the upper opening of the through hole 23 to form a movable molding hole 24. In addition, as shown in FIG. 2, the through-hole 23 is expanded in diameter toward the lower opening. The moving molding hole 24 is square as described above, and the vertical and horizontal dimensions thereof are (maximum thickness dimension of the tubular member 1) + (minimum thickness dimension of the tubular member 1) + (same tubular member). 1 of the hollow portion, that is, the width of the molding end 10 of the first fixed die 11). When the first moving die 15 is inserted into the sliding hole 20, the inner edge 24 c parallel to the sliding direction (longitudinal direction) of the moving molding hole 24 is the inner edge 12 c of the fixed molding hole 12. It is set to overlap. Therefore, the inner edge 24d at a position facing the inner edge 24c overlaps with the tip end position of the bearing portion 16a when the second moving die 16 is at the most lowered position. The reciprocating sliding range of the first moving die 15 is set such that the inner edges 24 a and 24 b are not close to the molding end 10 below the minimum wall thickness of the tubular member 1. In other words, the reciprocating sliding range of the first moving die 15 is set such that the inner edges 24a and 24b are not separated from the molding end 10 by more than the maximum wall thickness of the tubular member 1. .
[0016]
As shown in FIG. 6, the second moving die 16 is exposed to a sliding portion 25 having a T-shaped cross section inserted into the sliding hole 19 and the outside of the sliding hole 19. It is an integrally formed body comprising a connecting portion 26 connected to a sliding drive device. The tip of the sliding portion 25 having a T-shaped cross section is formed to be inclined at the same angle as the inclined surface 17, and the tip is the aforementioned bearing portion 16a. The width dimension of the bearing portion 16a is (the minimum thickness dimension of the tubular member 1) × 2 + (the width dimension of the hollow portion of the tubular member 1, that is, the width dimension of the molding end 10 of the first fixed die 11). ) Is set. As described above, the reciprocating sliding range of the second moving die 16 is such that the bearing portion 16a at the tip thereof is not close to the molding wall 10 below the minimum wall thickness of the tubular member 1, It is set in a range that is not separated from the forming end 10 by more than the maximum wall thickness of the tubular member 1.
[0017]
Next, referring to FIG. 7, the variable thickness tubular member 1 having the above shape, which is an embodiment of the extrusion molding method of the variable thickness tubular member according to the present invention using the molding die having the above configuration, is integrated. Will be described.
In this figure, the inner edge 12a forms the thick part 2a of the tubular member 1, the inner edge 12b also forms the thick part 3a of the tubular member 1, and the inner edge 12c is a wall part of the tubular member 1 that is always uniform in thickness. 5, the bearing portion 16 a forms the wall portion 4 including the thick portion 4 a of the tubular member 1.
[0018]
First, when the first moving die 15 is in the position shown in FIG. 7 in a state where the heat-formed material (aluminum or aluminum alloy) is press-fitted into the supply passage 18 and pushed out through the forming hole, the first wall A thick part 2 a is formed in the part 2. From this state, when the first moving die 15 is moved downward in the drawing, the thick portion 2a gradually decreases in thickness, and the inner edge 12a of the moving forming hole 12 of the first moving die 15 becomes the forming end 10. When approaching closest, the first wall portion 2 has a minimum thickness, and accordingly, the second wall portion 3 gradually increases in thickness, and a thick portion 3a is formed.
[0019]
On the other hand, when the second moving die 16 is at a position closest to the forming end 10 as shown in FIG. 7, the third wall portion 4 of the tubular member 1 has a minimum thickness. It is formed. When the second moving die 16 is pulled back from this state, the third wall portion 4 gradually increases in thickness, and when the moving die 16 reaches the most retracted position, the thick portion 4a is formed. .
As described above, the first moving die 15 and the second moving die 16 are appropriately reciprocally slid to provide a thick portion at a desired position on the outer surface of the tubular member 1.
[0020]
In the above embodiment, the thick wall portions 2a are alternately formed on the first wall portion 2 of the tubular member 1 and the second wall portion 3 opposed thereto by sliding of the first moving die 15. And 3a are formed, but if a two-layer structure in which members having the same shape and dimension are overlapped as the first moving die is configured to be slidable relatively, It is also possible to form a tubular member having a longitudinal region in which no first thick part 2a or second thick part 3a exists in the direction.
In addition, the tubular member can be formed into a polygonal shape by forming the molded end 10, the fixed molded hole 12, the movable molded hole 24, and the bearing portion 16a into various shapes such as a polygonal shape or a curved surface. It can be formed into various cross-sectional shapes such as tubular and circular tubular.
[0021]
【The invention's effect】
As described above, according to the extrusion molding die of the present invention and the extrusion molding method using the same, the first fixed die constituting the hollow portion of the tube and the maximum wall thickness of the surrounding tube of the first fixed die A second fixed die having a fixed molding hole defining a thick portion; a movable molding hole having substantially the same size as the fixed molding hole; and a slidably attached to the second fixed die. An extrusion molding die comprising at least one fixed die and a second moving die slidably attached to the second fixed die so as to cross the first fixed die; Since the thick part is formed in the tubular member by relatively sliding each of the moving dies, the thick variable part is integrally formed on the outer surface of the portion requiring reinforcement. The parts can be easily and integrally extruded .
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a variable thickness tubular member.
FIG. 2 is a cross-sectional configuration diagram showing an embodiment of an extrusion die according to the present invention.
FIG. 3 is a back side configuration diagram of a first fixed die that constitutes the extrusion die shown in FIG. 2;
4 is a sectional view taken along line VI-VI in FIG. 2;
5 is a perspective view of a first moving die that constitutes the extrusion die of FIG. 2; FIG.
6 is a perspective view of a second moving die that constitutes the extrusion die of FIG. 2. FIG.
7 is an explanatory view of an extrusion molding method of a variable thickness tubular member using the extrusion die of FIG. 2. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Thickness variable tubular member 2 1st wall part 2a 1st thick part 3 2nd wall part 3a 2nd thick part 4 3rd wall part 4a 3rd thick part 5 4th wall Part 10 Molding end 11 First fixed die 12 Fixed molding hole (second fixed die molding hole)
12a, 12b, 12c, 12d Inner edge of fixed molding hole 13 Second fixed die 14 Moving molding hole (molding hole of first moving die)
15 First moving die 16 Second moving die 16a Bearing portion 17 of second moving die 17 Inclined surface 18 Molded body supply port 19 Sliding hole 20 Sliding groove 21 Sliding portion 22 of first moving die 22 First Connecting portion 23 of the moving die of the through hole 24a, 24b, 24c, 24d Inner edge 25 of the moving forming hole 26 Sliding portion 26 of the second moving die 26 Connecting portion of the second moving die

Claims (5)

The first and second wall portions located opposite to each other about the axis and the third wall portion on at least one side orthogonal to the wall portions are intermittently thick in the longitudinal direction. A die for integrally extruding the formed variable thickness tubular member,
A first fixed die having a molded end forming a hollow portion of the tubular member;
A second fixed die having a fixed molded hole in the center, and facing the periphery of the molded end of the first fixed die to define the maximum thickness of the tubular member;
A movable molding hole is provided at the center, and reciprocating slides along the direction connecting the first and second inner edges of the second fixed die opposite to each other with respect to the second fixed die. A first moving die arranged freely,
A second fixed die is attached to the second fixed die so as to be able to protrude and retract toward the forming end of the first fixed die so as to be orthogonal to the sliding direction of the first moving die 15 . A moving die,
In the moving forming hole of the first moving die, the dimension between the opposing inner edges is the width dimension of the forming end of the first fixed die + the minimum thickness dimension of the tubular member + the maximum thickness of the tubular member. A die for extrusion molding, characterized in that it is formed to dimensions.   2. The extrusion molding according to claim 1, wherein the molded symmetrical tubular member is a rectangular tube, and the outer peripheral shape of the first fixed die, the fixed molded hole, and the movable molded hole are formed in a rectangular shape. Dice for. Using the extrusion molding die according to claim 1 or 2, while extruding a molding material toward the die, the first moving die is reciprocally slid with respect to the fixed die, and the extruded tubular member The first and second thick portions are alternately formed on the outer surfaces facing each other, and the second movable die is moved toward and away from the first fixed die, so that the first tubular member to be pushed out is first And a method for extruding the variable thickness tubular member, wherein the third thick part is intermittently formed on the outer surface orthogonal to the second thick part. 4. The extrusion molding method for a variable thickness tubular member according to claim 3, wherein the molding material is aluminum or an aluminum alloy . 5. The extrusion method for a variable thickness tubular member according to claim 3 , wherein the variable thickness tubular member is an industrial fluid pipe or a branch pipe thereof .

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