JP2013248638A - Method and apparatus for manufacturing tubular member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus for manufacturing a tubular member, by which the look on appearance is made better and also manufacturing can be performed while the cost is suppressed.SOLUTION: In a method for manufacturing a tubular member, while holding one end side, the distance between the opposite wall parts on the other end side is made smaller than that of the one end side, concerning a tubular member to be worked which is formed into an approximately rectangular shape in the cross sectional view and extended in the axial direction. The method is provided with: a first pressurizing stage where first wall parts of the member to be worked, which are opposite to each other, are pressurized in a direction making them approach each other; and a second pressurizing stage where second wall parts, which are adjacent to the first wall parts and opposite to each other, are pressurized in a direction making them approach each other; wherein at least one of the first pressurizing stage and/or the second pressurizing stage has a deformed part forming stage for forming deformed parts in which while being extended in the axial direction, the member to be worked is deformed toward the inward.

Description

  The present invention relates to a tubular member manufacturing method and a tubular member manufacturing apparatus.

  In general, a store such as a supermarket or a convenience store is provided with a plurality of article display shelves for displaying articles made of tubular members. This article display shelf allows a pair of left and right columns to be erected from the floor, legs extending forward from the lower portion of the column, a connecting rod connecting the lower portions of the pair of columns, and an article to be placed. For example, a column, a leg, a connecting rod and the like are formed of a tubular member.

The legs constituting such an article display shelf may be configured by joining a first tubular member and a second tubular member, both of which are formed in a tubular shape. Specifically, the second tubular member has an insertion portion formed to have an outer dimension smaller than that of the first tubular member, and a leg body formed with substantially the same outer dimension as the first tubular member. Yes. And the insertion part of a 2nd tubular member is inserted and arrange | positioned inside the 1st tubular member, both are joined and the leg is comprised (refer following patent document 1).
Here, in the second tubular member, the insertion portion and the leg main body are joined together by welding.

  In the method for joining legs as described above, the leg can be set to an arbitrary length by inserting and arranging the insertion portion of the second tubular member in the first tubular member. Since the joint location between the tubular member and the second tubular member is not conspicuous, the appearance can be improved.

  On the other hand, as a method for manufacturing a metal tubular member having different outer dimensions, a drawing method is generally used in which a reduced diameter portion having a small outer dimension is manufactured by pressing the outer peripheral portion of the tubular member inward with a die. Has been adopted. Thereby, the tubular member which has a diameter-reduced part and a diameter-expanded part made larger diameter than this diameter-reduced part is manufactured.

Japanese Patent No. 3477604

  However, in the manufacturing method of the second tubular member described in Patent Document 1, there is a problem in that the cost increases because the insertion portion and the leg body are joined by welding. Therefore, it has been desired to develop a method for manufacturing a tubular member having different external dimensions at low cost.

  On the other hand, in the drawing method described above, there is a possibility that drawing wrinkles may occur on the surface when drawing and there is a problem that it does not look good. Moreover, in order to press with a die | dye, the drive device with a large capacity | capacitance is needed and there exists a problem that cost increases.

  The present invention has been made in view of the above circumstances, and provides a tubular member manufacturing method and a tubular member manufacturing apparatus that can be manufactured with good appearance and at low cost.

In order to achieve the above object, the present invention employs the following means.
That is, in the tubular member manufacturing method according to the present invention, a tubular workpiece to be processed that is formed in a substantially rectangular shape in cross-section and extends in the axial direction is held at one end side and the other end side from the one end side. A method of manufacturing a tubular member having a reduced distance between opposing wall portions, the first pressing step of pressing the opposing first wall portions of the member to be processed toward each other, and the first wall A second pressing step that presses the second wall portions adjacent to each other in a direction to approach each other, and at least one of the first pressing step or the second pressing step extends in the axial direction. It has the deformation | transformation part formation process which forms the deformation | transformation part which the to-be-processed member deform | transformed toward the inside.

  In addition, the tubular member manufacturing apparatus according to the present invention has a substantially rectangular shape in cross-sectional view and extends in the axial direction while holding one end side of the tubular member, and the other end side from the one end side. Is an apparatus for manufacturing a tubular member that reduces the distance between opposing wall portions, and is an apparatus main body placed on the floor, and a support member that is inserted and arranged inside the other end of the workpiece. A first mold that presses the core and the first wall portions of the workpiece to be vertically opposed to each other in a direction to approach each other, and a second mold that is adjacent to the first wall portion and is opposed to each other in the left-right direction. A second mold that presses the wall portions in the direction of approaching each other, and at least one of the first mold or the second mold has a protrusion that extends in the axial direction and protrudes toward the workpiece. A portion is formed.

In the tubular member manufacturing method and the tubular member manufacturing apparatus configured as described above, it is possible to form a tubular member having a reduced distance between opposing wall portions by the first pressing step, the second pressing step, and the deformed portion forming step. it can. Only a step portion is formed between the other end side having a small distance between the wall portions and the one end side having a large distance between the wall portions, and the appearance can be improved.
In addition, the amount of deformation in which the distance between the wall portions has changed can be reliably absorbed by the deformed portion formed on the other end side, so that, for example, the appearance does not cause buckling or cracks and the appearance is good. It can be.
Further, since the stress can be absorbed by the deforming portion, the pressing force by the pressing portion can be suppressed. Therefore, since the capacity of the pressing part can be suppressed, the cost can be suppressed.
Moreover, the manufacturing apparatus of a tubular member should just be provided with the apparatus main body, the support core, the 1st metal mold | die, and the 2nd metal mold | die. Therefore, since the several tubular member can be manufactured with the manufacturing apparatus of one tubular member, cost reduction can manufacture a tubular member.
Moreover, the distance between wall parts of the other end side can be set suitably by adjusting the amount of press in a 1st press process and a 2nd press process. Therefore, since the tubular member of various dimensions can be manufactured in one manufacturing apparatus, the versatility as a manufacturing apparatus can be improved.

  In addition, the tubular member manufacturing apparatus according to the present invention includes a pressing portion that presses the first mold and the second mold downward, and the apparatus main body has the left-right direction downward from above. A first inclined wall portion that is inclined toward the center of the second mold, and the second mold moves the second mold downward along the first inclined wall portion by pressing from the pressing portion. And it is preferable to have the 2nd inclination wall part corresponding to said 1st inclination wall part which can move toward the center side of the said left-right direction.

  In the tubular member manufacturing apparatus configured as described above, the pressing part presses the second mold, and therefore the second mold moves toward the center in the left-right direction as it moves downward. The workpiece can be reliably pressed in the direction in which the workpiece is brought close to the left-right direction.

  Further, in the tubular member manufacturing apparatus according to the present invention, the first mold is separated from the left and right direction and the separation mold in which the convex portion is formed and the separation mold are separated from each other. The separation mold is in contact with the second mold, and close to each other as the second mold moves downward by the pressing from the pressing section. You may move in the direction you want.

  In the tubular member manufacturing apparatus configured in this way, the deformation amount can be absorbed by the deformation portion in the left-right direction and the vertical shrinkage amount of the workpiece, so that the distance between the wall portions is reduced. A member can be manufactured.

  According to the tubular member manufacturing method and the tubular member manufacturing apparatus according to the present invention, the tubular member is formed in which the distance between the opposing wall portions is reduced by the first pressing step, the second pressing step, and the deformed portion forming step. . Since no step is formed on the other end portion side and the one end portion side where the distance between the wall portions is small, it is possible to manufacture a tubular member that can be manufactured with good appearance and reduced cost. .

It is a perspective view which shows one usage example of the tubular member manufactured by the manufacturing method of the tubular member which concerns on one Embodiment of this invention. It is a disassembled perspective view which shows one usage example of the tubular member manufactured with the manufacturing method of the tubular member which concerns on one Embodiment of this invention. It is a schematic sectional drawing which shows the state which mounted the to-be-processed member in the manufacturing apparatus of the tubular member which concerns on one Embodiment of this invention. It is a schematic sectional drawing which shows the one aspect | mode of the manufacturing apparatus of the tubular member which concerns on one Embodiment of this invention. It is a schematic sectional drawing which shows the state which the 1st metal mold | die and 2nd metal mold | die of the manufacturing apparatus of the tubular member which concerns on one Embodiment of this invention are pressing the to-be-processed member. (A) The principal part enlarged view of FIG. 4, (b) The principal part enlarged view of FIG. 5, (c) The principal part enlarged view of FIG. In the tubular member manufacturing apparatus according to the modification of the embodiment of the present invention, (a) an enlarged view of a main part showing a state where a workpiece is placed, (b) an enlarged view of an essential part showing one embodiment, (c). It is a principal part enlarged view which shows the state which the 1st metal mold | die and the 2nd metal mold are pressing the workpiece.

  Hereinafter, a tubular member manufacturing method and a tubular member manufacturing apparatus according to an embodiment of the present invention will be described.

(Tubular member)
First, an article display fixture that is one example of use of a tubular member manufactured by the manufacturing method of the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the article display fixture 2 includes a pair of left and right base legs 3 that are spaced apart in the left-right direction, and a front connecting member 4 that connects the front end portions of the pair of base legs 3 to each other. And a pair of left and right support columns 5 standing from the base leg 3 and a lower connecting member 6 for connecting the lower portions of the pair of support columns 5 to each other. In addition, the base leg 3, the front part connection material 4, the support | pillar 5, and the lower connection material 6 are formed, for example by bending a steel plate.

As shown in FIG. 2, the base leg 3 includes a first base leg 11 formed in a tubular shape and a second base leg 100 (hereinafter referred to as a tubular member) partially inserted into the first base leg 11. It is called).
The first base leg 11 has an engagement hole 13 formed in a pair of opposing wall portions.

  The tubular member 100 is a tubular member formed in a substantially rectangular shape in cross-sectional view extending in the axial direction P. Further, the tubular member 100 is set such that the distance between the walls facing the other end side 102 is smaller than the one end side 101 in the axial direction P. Further, the boundary portion between the one end side 101 and the other end side 102 is a stepped portion 103 standing upright at a substantially right angle.

  Here, the dimensions of the one end side 101 and the other end side 102 in one direction orthogonal to the axial direction P are the dimensions H and I, respectively, and the one end side 101 and the other end side 102 in the other direction orthogonal to the axial direction P are Let the dimensions be dimensions J and K, respectively.

The dimensions I and K on the other end side 102 are set smaller than the dimensions H and J on the one end side 101, respectively.
The tubular member 100 has an engagement piece 14 formed at a position corresponding to the engagement hole 13 formed in the first base leg 11.

  By inserting and arranging the other end side 102 of the second base leg 100 thus configured inward of the first base leg 11, the engagement piece 14 formed on the second base leg 100 becomes the first base leg 100. 11, the first base leg 11 and the second base leg 100 are joined to each other.

(Tutorial member manufacturing equipment)
Next, the tubular member manufacturing apparatus 1 configured as described above will be described with reference to FIG.
As shown in FIG. 3, the tubular member manufacturing apparatus 1 includes an apparatus main body 20 that supports a tubular workpiece 9, a first mold 30 and a second mold 60 that press the workpiece 9, A support core 70 inserted and disposed inside the processing member 9 and a pressing portion 80 that presses the first mold 30 and the second mold 60 downward are provided.

  For the sake of convenience, the paper surface depth direction shown in FIG. 3 is referred to as an axial direction P, and the paper surface left-right direction shown in FIG.

  Here, the workpiece 9 is a tubular member having a substantially rectangular shape in cross-sectional view extending in the axial direction P, adjacent to the first wall portion 9A facing each other in the vertical direction, and the first wall portion 9A. It has the 2nd wall part 9B which mutually opposes in the left-right direction. Further, the other end 102 of the workpiece 9 is disposed so as to be pressed against the first mold 30 and the second mold 60.

(Device body)
The apparatus main body 20 includes an apparatus base 21 placed on the floor, a pair of apparatus wall portions 22 extending upward from both sides in the left-right direction of the apparatus base 21, and one end of the workpiece 9 And a holding portion (not shown; the same applies hereinafter) that holds the side 101.

  The device wall portion 22 includes a standing wall portion 26 erected from the device base 21, an upper wall portion 27 extending in the left-right direction from the upper portion of the standing wall portion 26, and an end portion of the upper wall portion 27 It has the 1st inclination wall part 28 extended toward the downward direction.

  The first inclined wall portion 28 is formed so as to go to the center side in the left-right direction as it goes downward from above.

(First mold)
The first mold 30 is composed of a pair of upper and lower parts, and is provided above a lower mold 40 provided above the apparatus base 21 and a workpiece 9 provided above the lower mold 40. The upper mold 50 is pressed, and the lower mold 40 and the upper mold 50 press the opposing first wall portions 9A of the workpiece 9 in the direction of approaching each other.

  The lower mold 40 includes a pair of separation molds 41 that are spaced apart in the left-right direction, and a biasing portion 49 that biases the separation mold 41 in a direction away from each other.

  The pair of separation molds 41 includes a separation bottom 42, a separation standing wall 43 that stands from the separation bottom 42 and contacts the second mold 60, and a separation upper wall 44 that faces the separation bottom 42. And a separation connecting wall 45 for connecting the separation upper wall 44 and the separation bottom 42.

  The separation upper wall portion 44 is formed with a lower convex portion 46 extending in the axial direction P and projecting toward the workpiece 9 when viewed in a cross section perpendicular to the axial direction P. The portion 45 is provided with a recess 47, and both ends of the urging portion 49 are fixed to the pair of recesses 47, respectively.

  The upper mold 50 is formed with an upper convex portion 51 on the lower surface thereof extending in the axial direction P and projecting toward the workpiece 9 when viewed in a cross section perpendicular to the axial direction P, spaced apart in the left-right direction. ing.

(Second mold)
The 2nd metal mold | die 60 is comprised by left-right pair, and is pressing in the direction which makes the 2nd wall part 9B of the to-be-processed member 9 adjoin each other.
The second mold 60 includes a second inclined wall portion 61 corresponding to the first inclined wall portion 28 of the apparatus main body 20 and a lower portion extending from the lower portion of the second inclined wall portion 61 toward the central side in the left-right direction. A wall 62, a first abutting wall 63 extending from the end of the lower wall 62 to the separated standing wall 43 of the lower mold 40 and extending upward; A second abutting wall portion 64 that can be brought into contact with the upper mold 50 from the upper portion of the contacting wall portion 63 and extends toward the second inclined wall portion 61 is provided.

(Supporting core)
The supporting core 70 is inserted and arranged inside the other end side 102 of the workpiece 9, and extends in the axial direction P on the upper surface of the portion corresponding to the other end side 102 of the workpiece 9. In addition, an upper groove 71 is formed that is recessed in the left-right direction, and a lower groove 72 that extends in the axial direction P and is recessed in the left-right direction is formed on the lower surface.

  The upper groove portion 71 has a shape corresponding to the upper convex portion 51 of the upper mold 50, and the lower groove portion 72 has a shape corresponding to the lower convex portion 46 of the separation mold 41.

  The pressing portion 80 is provided above the upper mold 50, and presses the upper mold 50 downward according to control from a control section (not shown), and the first mold as shown in FIGS. The second mold 60 is pressed through the mold 30.

(Method for producing tubular member)
Next, the manufacturing method of the tubular member 100 performed using the manufacturing apparatus 1 of the tubular member comprised as mentioned above is demonstrated.
The manufacturing method of the tubular member 100 includes a contact step S01 in which the upper mold 50 is brought into contact with the first wall portion 9A of the workpiece 9 and pressed downward, and a direction in which the opposed first wall portions 9A are brought close to each other. A first pressing step S02 that presses the second wall portion 9B, a second pressing step S03 that presses the opposing second wall portion 9B toward each other, and an upper pressing deformation portion 11A and a lower pressing deformation portion 11B on the workpiece 9. And a deformed portion forming step S04 to be formed.

  First, as a preliminary preparation, as shown in FIGS. 3 and 6A, the workpiece 9 and other members 9 are disposed above the lower mold 40 of the manufacturing apparatus 1 and between the pair of second molds 60. The end side 102 is placed.

  Here, the distance between the opposing first wall portions 9A of the workpiece 9 is a dimension J, and the distance between the opposing second wall portions 9B is a dimension H.

Next, the contact step S01 is executed.
That is, as shown in FIG. 4, the upper mold 50 is pressed downward by the pressing portion 80, and the lower surface of the upper mold 50 is placed on the first wall 9 </ b> A on the upper side of the workpiece 9 and the second mold 60. Abut each on the top surface.

  Here, the distance between the pair of upper convex portions 51 of the upper mold 50 and the distance between the pair of lower convex portions 46 of the lower mold 40 are respectively set as a distance S1.

  Thus, the upper abutment deforming portion 10 </ b> A extending in the axial direction P is left and right when the upper convex portion 51 of the upper mold 50 abuts the upper first wall portion 9 </ b> A of the workpiece 9. Formed apart in the direction. Further, the lower abutment deforming portion extending toward the axial direction P by the lower convex portion 46 of the lower mold 40 abutting against the lower first wall portion 9A of the workpiece 9. 10B is formed apart in the left-right direction.

  10A of upper side contact deformation parts and the lower side contact deformation part 10B are formed as a groove | channel where the outer surface is dented inward in cross section in the cross section orthogonal to the axial direction P, and the inner surface is facing inward. It is formed to protrude.

Further, as shown in FIG. 6B, the upper contact deformation portion 10A and the lower contact deformation portion 10B are formed at a distance S1 apart from each other in the left-right direction.
Here, the distance S <b> 1 is substantially the same as the distance between the pair of upper convex portions 51 and the pair of lower convex portions 46.

Next, the first pressing step S02 and the second pressing step S03 are performed simultaneously.
That is, as shown in FIG. 5, the upper mold 50 is pressed by the pressing portion 80, and the second mold 60 and the workpiece 9 are pressed through the upper mold 50.

  That is, by pressing the upper mold 50 with the pressing portion 80, the second mold 60 in contact with the lower surface of the upper mold 50 and the second contact wall 64 is pressed downward. As a result, a downward force acts on the second mold 60, and the second mold 60 has its second inclined wall portion 61 along the first inclined wall portion 28 of the apparatus body 20 in the downward and left-right directions. Try to move to the center side.

  Here, since the first contact wall 63 of the second mold 60 and the separation standing wall 43 of the separation mold 41 are in contact with each other, the separation mold 41 is moved from the second mold 60 in the left-right direction. Receives the force toward the center side. As a result, the urging portion 49 of the separation mold 41 contracts, and the separation mold 41 moves toward each other, that is, in the center in the left-right direction.

  As described above, due to the pressing force from the pressing portion 80, the second mold 60 moves to the center in the left-right direction as it moves downward, and presses the workpiece 9 from the left-right direction. The upper mold 50 moves downward as the second mold 60 moves downward, and presses the workpiece 9 together with the separation mold 41 from the vertical direction.

  In this way, the second pressing step S03 is performed in which the pair of second molds 60 moves to the center in the left-right direction and presses the opposing second wall portions 9B of the workpiece 9 in the direction of approaching each other. . Thereby, since it presses toward the center side of a left-right direction from a pair of 2nd metal mold | dies 60, the other end side 102 which reduced the distance between the opposing 2nd wall parts 9B is manufactured.

  In addition, the first pressing step S02 in which the upper mold 50 moves downward and presses the opposing first wall portions 9A of the workpiece 9 in the direction of approaching each other is performed simultaneously with the second pressing step S03. . Thereby, since the workpiece 9 is pressed downward from the upper mold 50, the other end side 102 in which the distance between the first wall portions 9A facing each other is reduced is manufactured.

  As shown in FIG. 6C, the distance between the first wall portions 9A facing each other is a dimension K, and the distance between the second wall portions 9B facing each other is a dimension I. The dimension K is smaller than the dimension J, and the dimension I is smaller than the dimension H.

  Further, when the upper convex portion 51 of the upper mold 50 is pressed against the upper first wall portion 9A of the workpiece 9, the upper pressing deformation portion 11 </ b> A extending in the axial direction P is left-right direction. Are spaced apart from each other. Further, the lower wall 46 of the lower mold 40 is pressed against the lower first wall 9 </ b> A of the workpiece 9, so that the lower side of the deformed portion extending in the axial direction P is pressed. The pressing deformation portions 11B are formed apart from each other in the left-right direction. As described above, the deformed portion forming step S04 is performed simultaneously with the first pressing step S02 and the second pressing step S03.

  The upper pressing deformation portion 11A and the lower pressing deformation portion 11B are formed as a groove whose outer surface is recessed inward in a cross section perpendicular to the axial direction P, and the inner surface protrudes inward. It is formed as follows.

  Further, as shown in FIG. 6C, the upper pressing deformation portion 11A is separated by a distance S1 in the left-right direction, and the lower pressing deformation portion 11B is separated by a distance T1 in the left-right direction.

  Here, the separation distance S1 of the upper pressing deformation portion 11A is the same as the separation distance S1 of the upper contact deformation portion 10A, and the separation distance T1 of the lower pressing deformation portion 11B is the separation distance S1 of the lower contact deformation portion 10B. Smaller than.

  According to the manufacturing method of the tubular member 100 using the tubular member manufacturing apparatus 1 configured as described above, the other end of the tubular member 100 is obtained by the first pressing step S02, the second pressing step S03, and the deformed portion forming step S04. The distance between the first wall portions 9A facing each other on the side 102 and the distance between the second wall portions 9B facing each other can be reduced. Here, only the step portion 103 standing at a substantially right angle is formed at the boundary portion between the other end side 102 having the small distance between the wall portions and the one end side 101 having the large distance between the wall portions, and the appearance is excellent. It can be.

  Further, the deformation amount of the distance between the first wall portions 9A (difference between the dimension J and the dimension K) and the deformation amount of the distance between the second wall portions 9B (the difference between the dimension H and the dimension I) are the other end side 102. Since it can be reliably absorbed by the upper pressing deformation part 11A and the lower pressing deformation part 11B formed in the above, for example, buckling or cracking does not occur on the appearance, and the appearance can be improved.

  The tubular member manufacturing apparatus 1 only needs to include the apparatus main body 20, the supporting core 70, the first mold 30, the second mold 60, and the pressing portion 80. Therefore, since the several tubular member 100 can be manufactured with the manufacturing apparatus 1 of the one tubular member, the tubular member 100 can be manufactured at low cost.

  Further, since the stress can be absorbed by the upper pressing deformation portion 11A and the lower pressing deformation portion 11B, the pressing force by the pressing portion 80 can be suppressed. Therefore, since the capacity of the pressing portion 80 can be suppressed, the cost can be suppressed.

  Moreover, the distance between 1st wall part 9A of the other end side 102 and the distance between 2nd wall part 9B can be suitably set by adjusting the amount of press in 1st press process S02 and 2nd press process S03. Therefore, since the tubular member of various dimensions can be manufactured in one manufacturing apparatus 1, the versatility as the manufacturing apparatus 1 can be improved.

(Modification)
As a modification of the embodiment described above, as shown in FIG. 7, the upper mold 150 is configured as a separation mold 141 like the lower mold 40, and the lower convex portion 146 of the separation mold 141 is covered. You may arrange | position so that 9 A of upper side walls of the process member 9 may be opposed. The second mold 160 has a size extending in the vertical direction of the upper mold 150, the workpiece 9 and the lower mold 40, and the upper mold 150 and the upper separation mold 141 of the pair of second molds 160. You may arrange | position so that an upper surface and the lower surface of the press part 180 may contact | abut.

  Even in this case, the pressing part 180 presses the second mold 160 and the upper separation mold 141, so that the second mold 160 that is in contact with the lower surface of the pressing part 180 at the second contact wall part 164 is obtained. The pressing portion 180 is pressed downward. When a downward force acts on the second mold 160, the second mold 160 moves its second inclined wall portion 161 downward along the first inclined wall portion 28 (see FIG. 3) of the apparatus main body 20. Attempts to move to the center in the left-right direction.

  Here, the first abutting wall portion 163 of the second mold 160 is in contact with the separating standing wall portion 143 of the upper separating mold 141 and the separating standing wall portion 43 of the lower separating mold 41. Therefore, the upper separation mold 141 and the lower separation mold 41 receive a force from the second mold 160 toward the center in the left-right direction. As a result, the urging portion 149 of the upper separation mold 141 and the urging portion 49 of the lower separation mold 41 contract, and the pair of upper separation mold 141 and the pair of lower separation molds. The 41 moves in directions close to each other.

  As described above, due to the pressing force from the pressing portion 80, the second mold 160 moves to the center in the left-right direction as it moves downward, and presses the workpiece 9 from the left-right direction. The upper separation mold 141 moves downward as the second mold 60 moves downward, and presses the workpiece 9 together with the lower separation mold 41 from above and below.

  In this way, the pair of second molds 160 moves to the center in the left-right direction and presses the second wall portion 9B of the workpiece 9 in the direction in which they are close to each other. The other end side 102 having a reduced distance is manufactured.

  In addition, since the upper separation mold 141 moves downward and presses the first wall portion 9A of the workpiece 9 in the direction of approaching each other, the distance between the opposing first wall portions 9A is reduced. The end side 102 is manufactured.

  Further, the upper separation mold 141 and the lower separation mold 41 are pressed, whereby the upper pressing deformation portion 11 </ b> A that extends in the axial direction P is formed on the upper first wall portion 9 </ b> A of the workpiece 9. Are formed spaced apart in the left-right direction, and a lower pressing deformation portion 11B extending in the axial direction P is formed spaced apart in the left-right direction on the lower first wall portion 9A of the workpiece 9. .

Further, the operation procedure shown in the above-described embodiment, or the shapes and combinations of the constituent members are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.
In addition, the numerical value shown above is an example and this invention is not limited to the said numerical value.

  For example, the convex portion may be formed on the first abutting wall portion 63 of the second mold 60, and the deformed portion may be formed on the second wall portion 9B of the workpiece 9 (not shown). Even in this case, the deformation amount of the distance between the first wall portions 9A (difference between the dimension J and the dimension K) and the deformation amount of the distance between the second wall portions 9B (the difference between the dimension H and the dimension I) are the second. Since it can be reliably absorbed by the deformed portion formed in the wall portion 9B, the appearance can be improved without causing any buckling or cracking on the appearance.

  Further, the distance between the pair of upper convex portions 51 of the upper mold 50 in the contact step S01 may be smaller than the distance between the pair of lower convex portions 46 of the lower mold 40. This makes it possible to align the distance between the pair of upper pressing deformation portions 11A and the separation distance of the pair of lower contact deformation portions 10B.

9 ... Workpiece 101 ... One end side 102 ... The other end side 11A ... Upper pressing deformation part (deformation part)
11B: Lower pressing deformation part (deformation part)
9A ... 1st wall part 9B ... 2nd wall part 20 ... Device main body 28 ... 1st inclination wall part 30 ... 1st metal mold 41 ... Separation metal mold 46 ... Lower side convex part (convex part)
49 ... Biasing part 51 ... Upper convex part (convex part)
60 ... Second mold
61 ... Second inclined wall portion 70 ... Supporting core 80 ... Pressing portion P ... Axial direction S02 ... First pressing step S03 ... Second pressing step S04 ... Deformed portion forming step

Claims (4)

A tubular member that is formed in a substantially rectangular shape in cross-section and extends in the axial direction, with the one end side held and the distance between the walls facing the other end side smaller than the one end side. A manufacturing method of
A first pressing step of pressing in a direction in which the first wall portions of the workpiece to be opposed to each other are brought close to each other;
A second pressing step of pressing the second wall portions adjacent to each other adjacent to the first wall portion in a direction to approach each other;
At least one of the first pressing step and the second pressing step includes a deformed portion forming step that extends in the axial direction and forms a deformed portion in which the workpiece is deformed inward. Manufacturing method of member. A tubular member that is formed in a substantially rectangular shape in cross-section and extends in the axial direction. A tubular member that holds one end of the member and reduces the distance between the walls facing the other end than the one end. Manufacturing equipment,
An apparatus body placed on the floor,
A supporting core that is inserted and arranged inward of the other end of the workpiece;
A first mold for pressing in a direction in which the first wall portions facing each other in the vertical direction of the workpiece are brought close to each other;
A second mold for pressing the second wall portions adjacent to each other in the left-right direction adjacent to the first wall portion in a direction in which the second wall portions approach each other;
At least one of the first mold and the second mold is provided with a convex portion that extends in the axial direction and protrudes toward the member to be processed. In the tubular member manufacturing apparatus according to claim 2,
A pressing portion for pressing the first mold and the second mold downward;
The apparatus body has a first inclined wall portion that is inclined from the upper side to the lower side toward the central side in the left-right direction,
The first mold allows the second mold to move downward along the first inclined wall portion and to move toward the center in the left-right direction by pressing from the pressing portion. A tubular member manufacturing apparatus having a second inclined wall portion corresponding to the inclined wall portion. In the tubular member manufacturing apparatus according to claim 3,
The first mold includes a separation mold that is spaced apart in the left-right direction and formed with the convex portion, and a biasing portion that biases the separation mold in a direction away from each other.
The separation mold is in contact with the second mold, and moves in a direction close to each other as the second mold moves downward by pressing from the pressing portion. manufacturing device.

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