JP2020124729A - Cylindrical member and manufacturing method of cylindrical member - Google Patents

Abstract

To provide a cylindrical member which can simplify a manufacturing process and a constitution of a manufacturing device, and a manufacturing method of the cylindrical member.SOLUTION: A manufacturing method of a winding collar 1 has: a first process for forming a rectangular member 41a and a frame member 42 by punching processing for punching a part of a long-length metal plate material 4, and forming an inclination face which is inclined downward toward a lower part of a lower end side part 411d by coining-processing the lower end side part 411d of an end face 411 of the rectangular member 41a; a second process for stopping a rise of the rectangular member 41a by making the end face 411 abut on the frame member 42 by ascending the rectangular member 41a in which the inclination face is formed; and a third process for forming the hollow cylindrical winding collar 1 by rounding the rectangular member 41a with a longitudinal direction of the metal plate member 4 as an axis so that the lower end side part 411d becomes an internal peripheral side in a radial direction.SELECTED DRAWING: Figure 8

Description

The present invention relates to a tubular member applied as a component of a vehicle such as an automobile and a method for manufacturing the tubular member.

BACKGROUND ART Conventionally, in a vehicle such as an automobile, a collar member has been used as a reinforcing spacer when fixing an upper panel and a lower panel of a vehicle subframe with bolts. As such a collar member, a winding collar formed by rolling a metal plate into a tubular shape is known.

Under such circumstances, Patent Document 1 relates to a metal pipe and a method for manufacturing the same, in which the metal plate 1 is sheared into a square metal material 2 by a shearing process, and the four end surfaces 3 of the sheared metal material 2 are brought close to or separated from each other. It is disclosed that the metal pipe is manufactured by forming the inclined surface 5 so as to be inclined and rolling the metal material 2 into a cylindrical shape with the side where the inclined surfaces 5 are close to each other being the inner side in the radial direction.

JP, 2003-191012, A

However, according to a study by the present inventor, in Patent Document 1, a shearing step of shearing a metal plate into a rectangular metal material and a tilting step of forming an inclined surface on an end surface of the metal material are separate steps. Therefore, there is room for improvement in simplifying the manufacturing process. Further, in Patent Document 1, when a sheared metal material is subjected to end bending, U bending and O bending, it is necessary to separately provide a member for positioning a bending jig with respect to the metal material. This complicates the configuration of the device.

The present invention has been made through the above studies, and an object thereof is to provide a tubular member and a method for producing the tubular member, which can simplify the manufacturing process and the configuration of the manufacturing apparatus.

In order to achieve the above object, a first aspect of the present invention is a method for manufacturing a tubular member made of metal, which comprises a rectangular member and the rectangular member formed by punching a part of a long metal plate downward. A frame member around the member is formed, and the lower end sides of the first end faces of both ends of the rectangular member in the longitudinal direction of the metal plate member are coined to face downward to the lower end side of the first end face. A first step of forming a first inclined surface that inclines inward, and raising the rectangular member having the first inclined surface to bring the first end surface into contact with the frame member. The second step of stopping the rising of the rectangular member by means of the above, and rounding the rectangular member abutting on the frame member with the longitudinal direction as an axis so that the first inclined surface is on the inner peripheral side in the radial direction. And a third step of forming the hollow cylindrical tubular member.

In addition, in the method for manufacturing a tubular member according to the second aspect of the present invention, in addition to the first aspect, the first step includes first and second end portions of the rectangular member in a plate width direction orthogonal to the longitudinal direction. The lower end side of the second end face is coined to form a second inclined surface that is inclined downward inward toward the lower end side of the second end face.

Further, a third aspect of the present invention is a tubular member having a hollow cylindrical metal cylindrical portion, wherein the end surfaces of both ends of the cylindrical portion in the central axis direction extend along the outer peripheral edge of the end surface. A cylindrical member having a high-roughness surface portion having a high surface roughness and a low-roughness surface portion provided on the inner peripheral side of the high-roughness surface portion and having a surface roughness lower than that of the high-roughness surface portion.

According to the manufacturing method of the first aspect of the present invention, there is provided a method of manufacturing a tubular member made of a metal, wherein a rectangular member and a surrounding portion of the rectangular member are punched by punching a part of a long metal plate downward. Forming a frame member, coining the lower end side of the first end faces of both ends of the rectangular member in the longitudinal direction of the metal plate material, and inclining inward downward toward the lower end side of the first end face; The first step of forming the first inclined surface and the second step of stopping the rising of the rectangular member by raising the rectangular member having the first inclined surface and bringing the first end surface into contact with the frame member And a third step of forming a hollow cylindrical tubular member by rolling a rectangular member that abuts the frame member around the longitudinal direction so that the first inclined surface is on the inner peripheral side in the radial direction. , The dimensional accuracy can be improved by substantially flattening the end faces at both ends in the longitudinal direction of the tubular member, and the manufacturing process and the structure of the manufacturing apparatus can be simplified. ..

According to the manufacturing method of the second aspect of the present invention, in the first step, the lower end side of the second end faces of both ends of the rectangular member in the plate width direction orthogonal to the longitudinal direction is coined to form the second step. Since the second inclined surface which inclines inward downward is formed on the lower end side of the end surface, the roundness of the cylindrical member obtained by rolling the rectangular member around the longitudinal direction as an axis is improved. be able to.

According to the configuration of the third aspect of the present invention, the tubular member has a hollow cylindrical metal cylindrical portion, and the end surfaces of both ends of the cylindrical portion in the central axis direction are along the outer peripheral edge of the end surface. Since it is provided with a high-roughness surface portion having a high surface roughness and a low-roughness surface portion provided on the inner peripheral side of the high-roughness surface portion and having a surface roughness lower than that of the high-roughness surface portion, a manufacturing process and a manufacturing apparatus The configuration and can be simplified.

FIG. 1 is a perspective view of a winding collar according to an embodiment of the present invention. FIG. 2 is an enlarged perspective view of a part of the winding collar according to the embodiment of the present invention. FIG. 3 is a perspective view showing a manufacturing process of the winding collar according to the embodiment of the present invention. FIG. 4 is a perspective view of a member formed in each step of the winding collar manufacturing process according to the embodiment of the present invention. FIG. 5: is a top view which shows the manufacturing process of the winding collar in embodiment of this invention. FIG. 6 is a side view of a member formed in the winding collar manufacturing process according to the embodiment of the present invention. FIG. 7: is sectional drawing which shows the 1st process of the manufacturing process of the winding collar in embodiment of this invention. FIG. 8 is a cross-sectional view of a rectangular member and a frame member punched in the first process of manufacturing the winding collar according to the embodiment of the present invention. FIG. 9: is sectional drawing which shows the 2nd process of the manufacturing process of the winding collar in embodiment of this invention. FIG. 10: is a perspective view which shows the rectangular member formed in the 1st process of the manufacturing process of the winding collar in the modification of embodiment of this invention.

Hereinafter, the tubular member and the method for manufacturing the tubular member according to the embodiment of the present invention will be described in detail by taking a winding collar applied as a component of a vehicle such as an automobile as an example. In the figure, the x-axis, the y-axis, and the z-axis form a three-axis orthogonal coordinate system, where the positive direction of the y-axis is the forward direction, the negative direction of the y-axis is the backward direction, and the positive direction of the x-axis is the left direction. , The negative direction of the x-axis is rightward, the positive direction of the z-axis is upward, and the negative direction of the z-axis is downward.

<Structure of winding color>
The configuration of the winding collar 1 according to the embodiment of the present invention will be described below in detail with reference to FIGS. 1 and 2.

FIG. 1 is a perspective view of a winding collar according to an embodiment of the present invention. FIG. 2 is an enlarged perspective view of a part of the winding collar according to the embodiment of the present invention.

The winding collar 1 has a hollow cylindrical metal cylindrical portion 2. The end surfaces 3 at both ends of the cylindrical portion 2 in the central axis P direction (front-back direction) are provided along the outer peripheral edge of the end surface 3 and the high rough surface portion 31 provided along the inner peripheral edge of the end surface 3. And a low-rough surface portion 32 provided on the inner peripheral side. The cylindrical portion 2 has a seam 11 parallel to the central axis P. The seam 11 extends from the front end to the rear end of the cylindrical portion 2.

The high-roughness surface portion 31 has a fractured surface with irregularities along the circumferential direction of the cylindrical portion 2, so that the surface roughness is high. The surface roughness of the low-rough surface portion 32 is lower than that of the high-rough surface portion 31 because the fracture surface is crushed along the circumferential direction of the cylindrical portion 2. As a result, the low-rough surface portion 32 has gloss compared to the high-rough surface portion 31.

The high-roughness surface portion 31 and the low-roughness surface portion 32 forming the end surface 3 are flat along the direction orthogonal to the central axis P. The highly rough surface portions 31 of the end faces 3 at both ends in the direction of the central axis P do not necessarily need to be flat along the direction orthogonal to the central axis P, and are separated from the outer peripheral edge of the end face 3 toward the central axis P. It may be formed to be inclined in the direction.

The winding collar 1 having the above configuration is provided between the upper panel and the lower panel, for example, in a state where the end surfaces 3 at both ends in the central axis P direction are in contact with the upper panel and the lower panel of the vehicle subframe, respectively. Bolts for fixing the panel and the lower panel are inserted into the cylindrical portion 2.

<Manufacturing method of winding color>
A method for manufacturing the winding collar 1 according to the embodiment of the present invention will be described below in detail with reference to FIGS. 3 to 9. FIG. 3 is a perspective view showing a manufacturing process of the winding collar according to the embodiment of the present invention. FIG. 4 is a perspective view of a member formed in each step of the winding collar manufacturing process according to the embodiment of the present invention. FIG. 5: is a top view which shows the manufacturing process of the winding collar in embodiment of this invention. FIG. 6 is a side view of a member formed in the winding collar manufacturing process according to the embodiment of the present invention. FIG. 7: is sectional drawing which shows the 1st process of the manufacturing process of the winding collar in embodiment of this invention. FIG. 8 is a cross-sectional view of a rectangular member and a frame member punched in the first process of manufacturing the winding collar according to the embodiment of the present invention. FIG. 9: is sectional drawing which shows the 2nd process of the manufacturing process of the winding collar in embodiment of this invention.

6(a) is a side view of the rectangular member 41a, FIG. 6(b) is a side view of the rectangular member 41b, and FIG. 6(c) is a side view of the completed winding collar 1. ing.

The winding collar 1 is formed by using the long metal plate material 4 shown in FIGS. 3 and 5. In the manufacturing process of the winding collar 1, the metal plate material 4 is conveyed rightward in FIGS. 3 and 5 at a predetermined feed pitch.

First, a rectangular member 41a shown in FIGS. 4A and 6A and a frame member 42 around the rectangular member 41a are formed by a punching process in which a part of the metal plate material 4 is punched downward. In the process of punching the rectangular member 41a downward by punching, the lower end side portions 411d of the end faces 411 at both ends of the rectangular member 41a in the longitudinal direction (front-back direction) of the metal plate member 4 are coined to lower end side portions 411d of the end face 411. Is an inclining surface that inclines inward toward the bottom (first step).

Specifically, in the first step, as shown in FIG. 7, a punch 101 and a die 102 are used to punch a part of the metal plate material 4 downward by punching, thereby forming a rectangular member 41a and a frame member. And 42. At this time, the end surface 411 has a shape that expands downward due to the clearance between the punch 101 and the die 102, and has a fracture surface. Further, the end surfaces 511 at both ends of the rectangular member 41a in the plate width direction (horizontal direction) of the metal plate member 4 also have a fracture surface.

Further, in the first step, the rectangular member 41a is pressed downward by the punch 101 until the lower surface of the rectangular member 41a contacts the inner bottom surface of the die hole 103 of the die 102 in the first step. Here, the inner walls 104 of the die holes 103 provided in the die 102, which face each other, are flat surfaces that are flat on the upper side in the vertical direction, and are inclined so that the lower sides gradually approach each other downward. It is an inclined surface. As a result, a compressive load is applied from the inner wall 104 to the lower end side portion 411d of the end surface 411 of the rectangular member 41a punched out by the die 102, and the lower end side portion 411d is directed downward as shown in FIG. It becomes an inclined surface that inclines toward one side. Further, a compressive load is applied from the inner wall 104 to the upper end side portion 411u of the end surface 411 of the rectangular member 41a punched out by the die 102, and the upper end side portion 411u is flattened in the vertical direction as shown in FIG. It becomes a flat surface.

The upper end side portion 411u of the end surface 411 thus formed becomes the highly rough surface portion 31 which is a fracture surface by shearing the rectangular member 41a from the metal plate material 4. Further, the lower end side portion 411d of the end surface 411 becomes a low roughness surface portion 32 having a roughness lower than that of the upper end side portion 411u by crushing the fracture surface by applying a large compressive load from the inner wall portion 104 by the coining process.

Next, the rectangular member 41a is lifted to bring the end surface 411 into contact with the frame member 42, thereby stopping the lifting of the rectangular member 41a (second step).

Specifically, by releasing the downward pressing force of the punch 101 against the rectangular member 41a, the rectangular member 41a is moved in a direction opposite to the punching direction by the biasing member 105 such as a coil spring, as shown in FIG. The rectangular member 41a rises by being urged upward, and the end face 411 of the rectangular member 41a contacts the end face 421 of the frame member 42, whereby the rising of the rectangular member 41a stops. At this time, since the lower end side portion 411d of the end face 411 is coined in the first step, the end face 411 is in a state of slightly bulging in the longitudinal direction of the metal plate material 4, so that the end face 411 and the end face 421 are formed. Can be easily brought into contact with.

Next, the rectangular member 41a is rolled around the longitudinal direction of the metal plate material 4 as an axis so that the lower end side portion 411d is on the inner peripheral side in the radial direction to form the hollow cylindrical winding collar 1 (third step). ..

Specifically, as shown in FIGS. 4B and 6B, both ends of the rectangular member 41b in the plate width direction of the metal plate member 4 are bent downward, and then the rectangular member 41b is bent downward in FIG. In the step of providing the guide rod 5 shown in the figure, as shown in FIG. 4C, the rectangular member 41c is rounded downward along the outer periphery of the guide rod 5, and as shown in FIG. The rectangular member 41d is further rounded along the outer circumference. Then, as shown in FIGS. 4(e) and 6(c), the winding collar 1 is completed by forming the joints 11 with the opposite end surfaces 511 facing each other. It should be noted that the winding collar 1 is not limited to the case where the winding collar 1 has the seam 11, and the both end surfaces 511 may have a gap and face each other.

In the above process, by setting the feeding direction of the rectangular member 41a to the same front direction as the axial direction P of the winding collar 1, the guide rod 5 is formed when the rectangular member 41c, the rectangular member 41d, and the winding collar 1 are formed. It can be shared and the accuracy of the feed pitch when feeding the rectangular member 41a in the feed direction can be improved.

Next, when the winding collar 1 is completely guided by the guide rod 5, the winding collar 1 drops downward, and as shown in FIG. 4(f), the frame member 42 around the completed winding collar 1 is covered with a metal plate material. Cut from 4.

The winding collar 1 manufactured as described above can prevent the upper panel and the lower panel that are in contact with the high-rough surface portion 31 from moving in the direction parallel to the high-rough surface portion 31 due to the high frictional force of the high-rough surface portion 31.

In the method for manufacturing the winding collar 1 of the present embodiment described above, the rectangular member 41a and the frame member 42 around the rectangular member 41a are formed by the punching process of punching a part of the long metal plate member 4 downward. The lower end side portion 411d of the end surface 411 at both ends of the rectangular member 41a in the longitudinal direction of the metal plate member 4 is coined to form an inclined surface that is inclined inward toward the lower end side portion 411d of the end surface 411. And the second step of stopping the rising of the rectangular member 41a by raising the rectangular member 41a having the inclined surface to bring the end surface 411 into contact with the frame member 42, and the rectangular member that comes into contact with the frame member 42. And a third step of forming the hollow cylindrical tubular member 1 by rolling 41a around the longitudinal direction so that the inclined surface is on the inner circumferential side in the radial direction. By substantially flattening the end faces at both ends in the central axis direction, the dimensional accuracy can be improved, and the manufacturing process and the structure of the manufacturing apparatus can be simplified.

Further, in the winding collar 1 of the present embodiment, the end surfaces 3 at both ends in the central axis P1 direction of the hollow cylindrical metal cylindrical portion 2 have a high surface roughness 31 and a high surface roughness 31. Since it is provided on the inner peripheral side and includes the low-rough surface portion 32 having a surface roughness lower than that of the high-rough surface portion 31, the end surface 3 can be made smooth when the winding collar 1 is formed. The positioning of the winding collar 1 with respect to the member to which the winding collar 1 is attached can be facilitated.

Various modifications are conceivable for the winding collar 1 of the present embodiment. Therefore, the winding collar of the modification of the present embodiment will be described in detail below with reference to FIG.

FIG. 10: is a perspective view which shows the rectangular member formed in the 1st process of the manufacturing process of the winding collar in the modification of embodiment of this invention. In FIG. 10, the same components as those in FIGS. 1 to 9 are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 10, in the first step, in the process of punching the rectangular member 14a downward by punching, the lower end side portions 511d of the end faces 511 of both ends of the rectangular member 14a in the plate width direction of the metal plate member 4 are coined. Then, the lower end side portion 511d of the end surface 511 is formed as an inclined surface which is inclined inward toward the lower side.

In the winding collar manufacturing method according to the modified example of the present embodiment, the first step is to coin the lower end side portions 511d of the end surfaces 511 at both ends of the rectangular member 14a in the plate width direction orthogonal to the longitudinal direction, Since the lower end side portion 511d of the end surface 511 is formed with an inclined surface that inwardly inclines downward, the roundness of the cylindrical member obtained by rolling the rectangular member 14a around the longitudinal direction as an axis is improved. Can be made.

It should be noted that the present invention is not limited to the type, shape, arrangement, number, etc. of the members described above in the embodiment, and appropriately replaces the constituent elements thereof with those having the same operational effect. Of course, it is possible to make appropriate changes without departing from the scope.

Specifically, although the winding collar and the method for manufacturing the winding collar have been described in the above embodiments, the present invention can be applied to a metal tubular member other than the winding collar and a method for manufacturing the tubular member. it can.

As described above, in the present invention, since it is possible to provide the tubular member and the method for producing the tubular member that can simplify the manufacturing process and the configuration of the manufacturing apparatus, the universal universal It is expected that it can be widely applied to the field of parts such as vehicles due to its unique characteristics.

DESCRIPTION OF SYMBOLS 1... Winding collar 2... Cylindrical part 3... End surface 4... Metal plate 5... Guide rod 11... Joint 31... High rough surface part 32... Low rough surface part 41a, 41b, 41c, 41d, 41e, 41f... Rectangular member 42... Frame Member 101... Punch 102... Die 411... End face 411u... Upper end side 411d... Lower end side 511... End face

Claims (3)

A method of manufacturing a tubular member made of metal,
A rectangular member and a frame member around the rectangular member are formed by a punching process in which a part of a long metal plate material is punched downward, and at the same time, a first end surface of both ends of the rectangular member in the longitudinal direction of the metal plate material is formed. A first step of coining the lower end side to form a first inclined surface which inclines downward toward the lower end side of the first end surface;
A second step of stopping the rising of the rectangular member by raising the rectangular member having the first inclined surface and bringing the first end face into contact with the frame member;
A third cylindrical member that is in contact with the frame member is rounded around the longitudinal direction as an axis so that the first inclined surface is on the inner circumferential side in the radial direction to form the hollow cylindrical tubular member. Process,
A method for manufacturing a tubular member, comprising: The first step is
The lower end sides of the second end faces of both ends of the rectangular member in the plate width direction orthogonal to the longitudinal direction are coined, and the second end face is inclined downward inward toward the lower end side of the second end face. Forming an inclined surface,
The method for manufacturing a tubular member according to claim 1, wherein. A tubular member having a hollow cylindrical metal cylindrical portion,
End surfaces at both ends in the central axis direction of the cylindrical portion have a high surface roughness, which is provided along the outer peripheral edge of the end surface, and a high roughness surface portion, which is provided on the inner peripheral side of the high roughness surface portion and which is higher than the high roughness surface portion. Also, with a low roughness surface part with low surface roughness,
A tubular member comprising:

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