Clamping device and method for manufacturing a clamping device

Abstract

To provide a clamp device which can improve the stability of a turning part, and a manufacturing method of the clamp device.SOLUTION: A clamp device 1 for gripping and fixing a rod-shaped or tubular objective member P has a first member 2 and a second member 3 for gripping the objective member P. The first member 2 and the second member 3 form turning parts 5 which are turnable with respect to each other by fitting rivets into riveting holes 6 which are formed at the members, respectively, and the objective member P is fixed by gripping the objective member P by turning the first member 2 and the second member 3, and fastening a fastening member 4 which is bridged between the first member 2 and the second member 3. At least either of the riveting holes 6 is formed so that a peripheral edge part of the riveting hole 6 becomes an erecting part 10 which is erected by burring, and the erecting part 10 is constituted so that a height of the erecting part reaches a prescribed height which is homogenized over an entire periphery.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a clamping device and a method for manufacturing the clamping device, and particularly to a clamping device and a method for manufacturing the clamping device that improve the stability of a rotating part in the clamping device.

Background Art

[0002] Conventionally, in a clamping device, there is known one in which two members are opened and closed through a rotating part formed therebetween to hold a target member such as a pipe. Further, it is known that the rotating part is formed by riveting holes together. Furthermore, conventionally, the holes of the rotating part are formed to have a tapered shape in the manufacturing process. When the holes have such a tapered shape, the area where the rivet contacts the peripheral part of the hole becomes small, and a gap occurs because the rivet and the hole do not fit exactly, so play is likely to occur, and there has been a problem of lack of stability of the rotating part.

[0003] In contrast, there has been proposed one in which a rising part by burring is formed in the hole for riveting, and riveting is performed on the hole in such a state (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in a conventional clamping device such as the above-described Patent Document 1, variations may occur in the rising height of the rising part raised by burring, and therefore, riveting may not be stable, and there may still be a case where the stability of the rotating part is lacking.

[0006] This invention has been made in view of these problems, and aims to provide a clamping device and a method for manufacturing a clamping device that can improve the stability of a rotating part. [Means for solving the problem]

[0007] To achieve the above objectives, the present invention provides a clamping device for gripping and fixing a rod-shaped or tubular target member, comprising a first member and a second member that clamp the target member, wherein the first member and the second member are configured to rotate relative to each other by fastening rivets in rivet holes provided in each member, the target member is clamped by rotating the first member and the second member, and the target member is fixed by tightening a fastening member stretched between the first member and the second member, wherein at least one of the rivet holes is formed such that the peripheral edge of the rivet hole is raised by burring, and the height of the raised portion is configured to be a predetermined height that is uniform around the entire circumference.

[0008] Furthermore, in addition to the configuration described above, the present invention is characterized in that the rising portion is a clamping device having a uniform height and a substantially trapezoidal cross-sectional shape, having a flat portion formed in the protruding direction and a tapered portion formed from the flat portion toward the outer diameter of the rivet fastening hole.

[0009] Furthermore, the present invention relates to a method for manufacturing a clamping device for gripping and fixing a rod-shaped or tubular target member, wherein the method for forming rivet holes that constitute a rotating part that allows a first member and a second member that clamp the target member to rotate comprises a pilot hole forming step of forming pilot holes in a plate material that will be the material for the first member and / or the second member, and a burring step of forming a raised portion in the pilot hole by burring, wherein the burring step comprises a punch formed to be larger in diameter than the pilot hole and a die that receives the punch, the die having a large-diameter upper hole portion and the punch The clamp device is characterized by having a stepped structure with a lower hole portion of a smaller diameter formed to be approximately the same diameter as the diameter of the die, the lower hole of the plate material is placed on the upper hole portion of the die, and the punch is used to punch through the upper hole portion to the lower hole portion, thereby bending the plate material around the periphery of the lower hole in the direction of the die, pushing it out into the area surrounded by the punch and the upper hole portion to form the rising portion, and the rising portion is pressed in the direction of the lower hole portion so as to come into contact with the lower surface of the upper hole portion, thereby forming the rising portion of uniform height.

[0010] Furthermore, in addition to the configuration described above, the present invention is characterized in that the rising portion is pushed out into the area surrounded by the punch and the upper hole and pressed toward the lower hole, thereby contacting the lower surface of the upper hole and forming a roughly trapezoidal cross-sectional shape with a uniform height, having a flat portion in the protruding direction and a tapered portion extending from the flat portion toward the outer diameter of the rivet fastening hole. [Effects of the Invention]

[0011] According to the present invention, the peripheral edge of the rivet hole forming the rotating part of the clamping device has a uniform raised portion of a predetermined height around its entire circumference formed by burring, thereby enabling stable riveting and, as a result, improving the stability of the rotating part of the clamping device.

[0012] Furthermore, according to the present invention, the rising portion has a roughly trapezoidal cross-sectional shape with a flat portion in the protruding direction and a tapered portion toward the outer diameter of the rivet fastening hole. This allows for a more stable shape of the rising portion, enabling more stable rivet fastening, and as a result, the stability of the rotating part of the clamping device can be further improved.

[0013] Furthermore, according to the present invention, by performing burring using a punch and a die with a stepped structure to form a raised portion of the rivet hole, a raised portion of a predetermined height can be formed uniformly around the entire circumference. As a result, stable riveting can be performed, and the stability of the rotating part of the clamping device can be improved.

[0014] Furthermore, according to the present invention, by forming the rising portion into a roughly trapezoidal shape in cross-section, having a flat portion in the protruding direction and a tapered portion toward the outer diameter of the rivet fastening hole, a more stable rising portion can be formed. As a result, more stable rivet fastening can be achieved, and the stability of the rotating part of the clamping device can be further improved. [Brief explanation of the drawing]

[0015] [Figure 1] This is a perspective view showing a clamping device according to an embodiment of the present invention. [Figure 2] This is a front view showing a clamping device according to the same embodiment. [Figure 3] This is a perspective view showing another example of a clamping device according to the same embodiment. [Figure 4] This is a front view showing another example of the clamping device according to the same embodiment. [Figure 5] This is a schematic cross-sectional view showing the state of riveting the rotating part of the clamping device according to the same embodiment. [Figure 6] (a) is a front view and (b) is a cross-sectional view AA showing the state after the pre-hole formation process in the manufacturing process of the clamping device according to the same embodiment. [Figure 7]It is a schematic cross-sectional view showing the state before the flanging process in the manufacturing process of the clamp device according to the present embodiment. [Figure 8] It is a schematic cross-sectional view showing the state during the flanging process in the manufacturing process of the clamp device according to the present embodiment. [Figure 9] It is a (a) front view and (b) B-B cross-sectional view showing the state after the flanging process in the manufacturing process of the clamp device according to the present embodiment.

Mode for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described.

[0017] Figs. 1 to 9 show embodiments of the present invention.

[0018] First, the outline of the clamp device 1 of the present embodiment will be described with reference to FIGS. 1 and 2.

[0019] The clamp device 1 of the present embodiment grips and fixes a rod-shaped or cylindrical target member P (here, a metal pipe). As shown in FIGS. 1 and 2, this clamp device 1 has a metal first member 2 and a second member 3 each formed in a curved shape (or bent shape) so as to sandwich the target member P. Further, as shown in FIG. 5, the first member 2 and the second member 3 form a rotatable rotating portion 5 by fixing a rivet R in the rivet holes 6 provided respectively. With such a configuration, the first member 2 and the second member 3 are rotated to sandwich the target member P, and then, by tightening the fastening member 4 (here, a bolt-shaped member for fastening) spanned between the first member 2 and the second member 3, the target member P is fixed. <000009۸> Furthermore, at least one of the rivet holes 6 (in this case, the first member 2) is formed such that the peripheral edge of the rivet hole 6 is raised by burring, as shown in Figure 5. This raised portion 10 is configured such that the height of the rise is uniformly predetermined over the entire circumference of the peripheral edge of the rivet hole 6.

[0021] Furthermore, the rising portion 10 has a flat portion 11 formed perpendicular to the protruding direction T (see Figure 5, etc.) at the end of the protruding direction T, and a tapered portion 12 formed from this flat portion 11 toward the outer diameter direction G of the rivet hole 6. It is formed to exhibit a roughly trapezoidal cross-sectional shape (shown by a dashed line in Figure 5, etc.) with a uniform height between the inner diameter surface parallel to the protruding direction T and the bottom surface of the rising portion 10 parallel to the flat portion 11. In this way, because the rising portion 10 is formed in a roughly trapezoidal cross-sectional shape, the rivet R is supported by the flat portion 11, and the rising portion 10 is further supported by the bottom surface which is wider than the rivet R. This provides greater stability and makes it easier to withstand the pressure of the rivet R compared to, for example, a case where the rising portion is formed in a roughly rectangular parallelepiped shape in cross-section and the surface supporting the rivet R and the surface supporting the rising portion are approximately the same area.

[0022] The other components of the clamping device 1 are the same as those of the conventional model, so a detailed explanation will be omitted.

[0023] Next, the manufacturing method of the clamping device 1 of this embodiment will be explained with reference to Figures 6 to 9.

[0024] Here, we will explain in detail the process of forming the rising portion 10 of the rivet hole 6 by burring during the manufacturing process of the clamping device 1. Other processes are the same as in conventional processes, so we will omit their explanation.

[0025] First, as shown in Figure 6, a pilot hole forming process is performed to create pilot holes 10A in the sheet metal 20 that will serve as the base for the first member 2 and / or the second member 3 by punching and pressing. At this time, considering the shape of the die and jig, a tapered hole is formed as the pilot hole 10A.

[0026] Next, as shown in Figures 7 to 9, a burring process is performed to form a raised portion 10 in the pilot hole 10A by burring. In this burring process, as shown in Figure 7, a punch 50 having a punch body 51 formed to be larger in diameter than the pilot hole 10A, and a die 60 that receives the punch 50 are provided.

[0027] The punch 50 has a punch body 51 that is inserted into the die 60, and a punch flange portion 52 formed in a flange shape on the upper part of the punch body 51. Furthermore, the tip of the punch body 51 has a rounded punch surface portion 53 with an R shape that allows it to smoothly press and deform the plate material 20 in the pilot hole 10A.

[0028] Furthermore, the die 60 has a stepped structure with a large-diameter upper hole 61 and a small-diameter lower hole 62 formed to be approximately the same diameter as the punch 50.

[0029] Then, the pilot hole 10A of the plate material 20 is placed on the upper hole portion 61 of the die 60 such that the smaller taper diameter faces the punch 50. Depending on the shape and size of the pilot hole 10A, the pilot hole 10A of the plate material 20 may be placed on the upper hole portion 61 of the die 60 such that the larger taper diameter faces the punch 50.

[0030] Then, the punch 50 punches through the upper hole 61 to the lower hole 62. Here, the plate material 20 around the periphery of the pilot hole 10A is bent in the direction of the die 60 and pushed out into the area surrounded by the punch body 51 of the punch 50 and the upper hole 61 of the die 60, forming the rising portion 10. At this time, as the rising portion 10 is formed, the bent portion is pressed in the direction of the lower hole 62, coming into contact with the lower surface of the upper hole 61, and the plate material 20 is further pressed by the punch frame-shaped portion 52 of the punch 50, so that the portion that has come into contact with the lower surface of the upper hole 61 is further pressed against, forming a flat portion 11, thereby forming a rising portion 10 of uniform height.

[0031] At this time, the rising portion 10 is pushed out into the area surrounded by the punch body 51 of the punch 50 and the upper hole portion 61 of the die 60, and is pressed toward the lower hole portion 62, so that it comes into contact with the lower surface of the upper hole portion 61, and a flat portion 11 is formed at the end of the protruding direction T in a direction substantially perpendicular to the protruding direction T, and a tapered portion 12 is formed from the flat portion 11 toward the outer diameter direction G of the rivet hole 6, so that it is formed in a roughly trapezoidal shape in cross-section (shown by the dashed line) with a uniform height having these features.

[0032] The clamping device of this embodiment is not limited to those described above, and may also be, for example, those shown in Figures 3 and 4. This clamping device 1A grips and fixes rod-shaped or cylindrical target members P1 and P2 (here, both are metal pipes) at different angles. As shown in Figures 3 and 4, this clamping device 1A has a first metal member 2A and a second metal member 3A, each formed in a curved (or bent) shape to sandwich the target member P1, and a first metal member 2B and a second metal member 3B, each formed in a curved (or bent) shape to sandwich the target member P2. Furthermore, these first members 2A, 2B and second members 3A, 3B are formed to have rotatable parts 5A and 5B that can rotate relative to each other by fastening rivets R in rivet holes 6A and 6B provided in each, similar to those shown in Figure 5. With this configuration, the first members 2A, 2B and the second members 3A, 3B are rotated to sandwich the target members P1, P2, and then the fastening members 4A, 4B (which are bolt-shaped in this case) that are stretched between the first members 2A, 2B and the second members 3A, 3B are tightened to fix the target members P1, P2 in place.

[0033] Furthermore, at least one of the rivet holes 6A and 6B (in this case, the first members 2A and 2B) is formed in the same way as shown in Figure 5, such that the peripheral edges of the rivet holes 6A and 6B are raised by burring. This raised portion 10 is configured, as described above, so that the height of the rise is a predetermined height that is uniform across the entire circumference of the peripheral edge of the rivet hole 6.

[0034] As described above, according to this embodiment, the peripheral edges of the rivet holes 6, 6A, 6B that form the rotating parts 5, 5A, 5B of the clamping device 1, 1A are formed by burring to create a uniform, predetermined height raised portion 10 around the entire circumference, thereby enabling stable riveting and, as a result, improving the stability of the rotating parts 5, 5A, 5B of the clamping device 1, 1A.

[0035] Furthermore, according to this embodiment, the rising portion 10 has a roughly trapezoidal cross-sectional shape with a flat portion 11 in the protruding direction and a tapered portion 12 toward the outer diameter of the rivet holes 6, 6A, 6B. This allows for a more stable shape of the rising portion 10, enabling more stable rivet fastening, and as a result, the stability of the rotating portions 5, 5A, 5B of the clamping devices 1, 1A can be further improved.

[0036] Furthermore, according to this embodiment, by performing burring using the punch 50 and the stepped die 60 to form the raised portion 10 of the rivet holes 6, 6A, 6B, it is possible to form a raised portion 10 of a uniform predetermined height around the entire circumference. As a result, stable riveting can be performed, and the stability of the rotating parts 5, 5A, 5B of the clamping devices 1, 1A can be improved.

[0037] Furthermore, according to this embodiment, by forming the rising portion 10 in a roughly trapezoidal shape in cross-section, having a flat portion 11 in the protruding direction and a tapered portion 12 toward the outer diameter of the rivet holes 6, 6A, 6B, a more stable shape of the rising portion 10 can be formed. As a result, more stable riveting can be performed, and the stability of the rotating portions 5, 5A, 5B of the clamping devices 1, 1A can be further improved.

[0038] Furthermore, the present invention is not limited to the embodiments described above, but can be applied to other configurations and other usage situations.

[0039] For example, in the embodiment described above, a case was described in which a raised portion is formed in the rivet hole of the rotating part of the clamping device by burring, but it is not limited to this, and the raised portion of the present invention may also be formed in rivet holes other than those of the rotating part of the clamping device. Furthermore, the method for forming the raised portion of the present invention may also be used to form the raised portion in rivet holes other than those of the rotating part of the clamping device.

[0040] Furthermore, although the above-described embodiment described the application of the present invention to a clamping device, the invention is not limited to this, and the technology of the present invention may be used as appropriate for other riveted members.

[0041] Furthermore, in the above-described embodiment, the punch was inserted from the smaller diameter end of the tapered pilot hole, but this is not the only possible configuration. It is also conceivable that the punch may be inserted from the larger diameter end of the pilot hole.

[0042] Furthermore, although the pilot hole is formed in a tapered shape in the above-described embodiment, the present invention is not limited to this, and can also be applied to a pilot hole that is not tapered but is formed to have the same diameter on both the front and back sides of the plate material. [Explanation of symbols]

[0043] 1. Clamping device 1A Clamping device 2. First Member 2A First Member 2B First Member 3. Second Member 3A Second component 3B 2nd member 4 Fastening members 4A Fastening Member 4B Fastening Member 5. Rotating parts 5A Rotating part 5B Rotating part 6 rivet holes 6A Rivet hole 6B Rivet hole 10. Rising section 10A pilot hole 11 Plane part 12 Tapered section 20 Board material 50 punches 51 Punch body 52 Punch flange 53 Punch curved section 60 Dies 61 Upper hole section (large diameter section) 62 Lower hole part (small diameter part) G Outer diameter direction P pipe (target component) P1 Pipe (Target component) P2 Pipe (Target component) R rivet T Projection direction

Claims

1. A clamping device for gripping and fixing a rod-shaped or tubular target member, It has a first member and a second member that sandwich the aforementioned target member, The first member and the second member are configured to have rivets fastened to rivet holes provided in each of them to form a rotatable portion that can rotate relative to each other, and the target member is fixed by rotating the first member and the second member to sandwich the target member and tightening the fastening member that is stretched between the first member and the second member. At least one of the rivet holes is formed such that the peripheral edge of the rivet hole is a raised portion created by burring. The clamping device is characterized in that the rising portion is configured such that the height of the rising portion is a predetermined height that is uniform over the entire circumference.

2. The clamping device according to claim 1, characterized in that the rising portion has a uniform height and a substantially trapezoidal cross-sectional shape having a flat portion formed in the protruding direction and a tapered portion formed from the flat portion toward the outer diameter of the rivet fastening hole.

3. A method for manufacturing a clamp device that grips and fixes a rod-shaped or tubular target member, In forming the rivet holes that constitute the rotating part that allows the first member and the second member that sandwich the aforementioned target member to rotate, A hole forming step of forming a pilot hole in a plate material that will be the material for the first member and / or the second member, A burring process to form a raised portion in the aforementioned pilot hole by burring, It has, The burring process includes a punch formed to be larger in diameter than the pilot hole and a die that receives the punch. The die has a stepped structure with a large-diameter upper hole and a small-diameter lower hole formed to be approximately the same diameter as the punch. A method for manufacturing a clamping device, characterized in that the pilot hole of the plate material is placed on the upper hole of the die, and the punch is used to punch through the upper hole to the lower hole, thereby bending the plate material around the pilot hole in the direction of the die, pushing it out into the area surrounded by the punch and the upper hole to form the rising portion, and the rising portion is pressed in the direction of the lower hole to come into contact with the lower surface of the upper hole, thereby forming the rising portion of uniform height.

4. The method for manufacturing a clamping device according to claim 3, characterized in that the rising portion is pushed out into the area surrounded by the punch and the upper hole and pressed toward the lower hole, so as to come into contact with the lower surface of the upper hole, and is formed in a roughly trapezoidal cross-sectional shape with a uniform height having a flat portion in the protruding direction and a tapered portion extending from the flat portion toward the outer diameter of the rivet fastening hole.

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