Clamping device and manufacturing method of clamping device

Abstract

The invention provides a clamping device capable of improving the stability of a rotating part and a manufacturing method of the clamping device. The gripping device (1) grips and fixes a rod-shaped or tubular object member (P), and is provided with a first member (2) and a second member (3) for sandwiching the object member (P), the first member (2) and the second member (3) are configured in such a manner that rivets are fixed in rivet fixing holes (6) respectively provided in the first member (2) and the second member (3) to form rotating parts (5) capable of rotating relative to each other, and the first member (2) and the second member (3) are rotated to sandwich the object member (P). The fastening member (4) erected between the first member (2) and the second member (3) is fastened to fix the member (P) to be fixed, at least one of the rivet fixing holes (6) is formed such that the peripheral edge of the rivet fixing hole (6) becomes a raised portion (10) raised by flanging, and the raised portion (10) is configured such that the height of the raised portion (10) becomes a predetermined height that is uniform over the entire circumference.

Description

Technical Field

[0001] The present invention relates to a clamping device and a method for manufacturing the clamping device, and in particular to a clamping device and a method for manufacturing the clamping device for improving the stability of a rotating part in the clamping device. Background Art

[0002] In the past, in the clamping device, there is known a clamping device that allows two components to open and close via a rotating portion formed between them to hold an object component such as a pipe. In addition, regarding the rotating portion, there is known a rotating portion that fixes the hole portions to each other by riveting. Moreover, in the past, the hole portion of the rotating portion was formed into a tapered shape during the manufacturing process. If the hole portion is tapered in this way, the contact area between the rivet and the peripheral portion of the hole portion becomes smaller. In addition, the rivet and the hole portion will not fit exactly and a gap will be generated, so it is easy to become loose, resulting in a problem of lack of stability of the rotating portion.

[0003] In response to this, it has been proposed to form a rising portion by burring in a hole portion to be riveted and to perform riveting in the hole portion in such a state (for example, refer to Patent Document 1).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent No. 5739933 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] However, in the conventional clamping device such as the above-mentioned Patent Document 1, the rising height of the rising portion raised by the flanging process may vary, so that the rivet fixing is unstable and the stability of the rotating portion is still lacking.

[0009] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a clamping device and a method for manufacturing the clamping device that can improve the stability of a rotating portion.

[0010] Solutions for solving problems

[0011] In order to achieve this problem, the present invention is characterized in that it is a clamping device that grasps and fixes a rod-shaped or tubular target member, wherein the clamping device has a first member and a second member that clamp the target member, and the first member and the second member are configured as follows: rivets are fixed to rivet fixing holes respectively provided in the first member and the second member to form rotating parts that can rotate with each other, so that the first member and the second member are rotated to clamp the target member, and a fastening member spanned between the first member and the second member is fastened to fix the target member, and the rivet fixing hole of at least one side is formed so that the peripheral edge portion of the rivet fixing hole becomes a rising portion that is erected by flanging processing, and the rising portion is configured so that the height of the rising becomes a uniform specified height throughout the entire circumference.

[0012] In addition, the present invention is characterized in that it is a clamping device as follows: based on the structure described above, the rising portion has a roughly trapezoidal shape in cross-section with a uniform height of a planar portion and a conical portion, the planar portion is formed on the protruding direction side, and the conical portion is formed from the planar portion toward the radial outside of the rivet fixing hole.

[0013] In addition, the present invention is characterized in that it is a manufacturing method of a clamping device, which is a manufacturing method of a clamping device for holding and fixing a rod-shaped or tubular target member, wherein, when forming a rivet fixing hole constituting a rotating portion that allows a first member and a second member that are clamped in the target member to rotate freely, it has: a pre-hole forming step, forming a pre-hole in a plate material that becomes the material of the first member and / or the second member; and a flanging step, forming a rising portion in the pre-hole by flanging processing, in which a punch formed with a larger diameter than the pre-hole and a die receiving the punch are provided, and the punch The die has a stepped structure with an upper hole portion with a large diameter and a lower hole portion with a small diameter, and the lower hole portion is formed to have a diameter substantially the same as that of the punch. The pre-hole of the plate is arranged on the upper hole portion of the die, and the punch is punched through the upper hole portion to the lower hole portion, so that the plate at the periphery of the pre-hole is bent toward the die and extruded toward a portion surrounded by the punch and the upper hole portion to form the rising portion, which is pressed toward the lower hole portion so as to abut against the lower surface of the upper hole portion to form the rising portion of uniform height.

[0014] In addition, the present invention is characterized in that it is a manufacturing method of the following clamping device: on the basis of the structure described above, the rising portion is extruded toward the portion surrounded by the punch and the upper hole portion, and is pressed toward the lower hole portion, thereby abutting against the lower surface of the upper hole portion, forming a cross-sectional roughly trapezoidal shape with a uniform height having a planar portion on the protruding direction side and a tapered portion extending from the planar portion toward the radially outer side of the rivet fixing hole.

[0015] Effects of the Invention

[0016] According to the present invention, by forming the peripheral edge of the rivet fixing hole of the rotating part of the clamping device by flanging to form a rising portion with a uniform specified height throughout the entire circumference, stable rivet fixing can be performed, and as a result, the stability of the rotating part of the clamping device can be improved.

[0017] In addition, according to the present invention, by forming the rising portion into a roughly trapezoidal shape in cross-section having a flat portion on the protruding direction side and a tapered portion toward the radially outer side of the rivet fixing hole, a more stable shape of the rising portion can be achieved, and more stable rivet fixing can be performed. As a result, the stability of the rotating portion of the clamping device can be further improved.

[0018] In addition, according to the present invention, by using a punch and a die with a stepped structure to perform flanging to form a rising portion of the rivet fixing hole, a rising portion with a uniform specified height around the entire circumference can be formed, as a result, stable rivet fixing can be performed, and the stability of the rotating portion of the clamping device can be improved.

[0019] In addition, according to the present invention, by forming the rising portion into a roughly trapezoidal shape in cross section having a flat portion on the protruding direction side and a tapered portion toward the radially outer side of the rivet fixing hole, a rising portion with a more stable shape can be formed, resulting in more stable rivet fixing, which can further improve the stability of the rotating portion of the clamping device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a perspective view showing a clamping device according to an embodiment of the present invention.

[0021] Figure 2 It is a front view which shows the clamping device of this embodiment.

[0022] Figure 3 It is a perspective view showing another example of the clamping device according to the embodiment.

[0023] Figure 4 It is a front view showing another example of the clamping device according to this embodiment.

[0024] Figure 5 This is a schematic cross-sectional view showing a state where a rivet is fixed to a rotating portion in the clamping device of this embodiment.

[0025] Figure 6 (a) A front view and (b) an AA cross-sectional view showing a state after a preliminary hole forming step in a manufacturing process of the clamping device of this embodiment.

[0026] Figure 7It is a schematic cross-sectional view showing a state before processing in a flanging step in the manufacturing process of the clamping device of this embodiment.

[0027] Figure 8 It is a schematic cross-sectional view showing a state during processing in a flanging step in the manufacturing process of the clamping device according to this embodiment.

[0028] Fig. 9 (a) A front view and (b) a BB cross-sectional view showing a state after a flanging step in a manufacturing process of the clamping device of this embodiment. DETAILED DESCRIPTION

[0029] Hereinafter, embodiments of the present invention will be described.

[0030] exist Figures 1 to 9 Embodiments of the present invention are shown in FIG.

[0031] First, use Figure 1 and Figure 2 The outline of the clamping device 1 according to the present embodiment will be described.

[0032] The clamping device 1 of this embodiment grasps and fixes a rod-shaped or cylindrical target member P (here, a metal pipe). Figure 1 and Figure 2 As shown in FIG. 1 , the clamping device 1 includes a first member 2 and a second member 3 made of metal, each of which is formed into a bent shape (or a folded shape) so as to sandwich the target member P. Figure 5 As shown, the first member 2 and the second member 3 are fixed with rivets R in rivet fixing holes 6 respectively provided in the first member and the second member to form a rotating portion 5 that can rotate mutually. With such a structure, the first member 2 and the second member 3 are rotated to sandwich the target member P, and on this basis, the fastening member 4 (here, fastened with a bolt-shaped member) provided between the first member 2 and the second member 3 is fastened to fix the target member P.

[0033] In addition, if Figure 5 As shown, at least one of the rivet fixing holes 6 (here, the rivet fixing hole 6 of the first member 2) is formed such that the peripheral edge of the rivet fixing hole 6 becomes a raised portion 10 raised by flanging. The raised portion 10 is configured such that the height of the raised portion is a uniform predetermined height throughout the peripheral edge of the rivet fixing hole 6.

[0034] Here, the rising portion 10 is formed so as to extend in the protruding direction T (see Figure 5The top end of the rivet fixing hole 6 has a flat surface 11 formed in a direction perpendicular to the protruding direction T and a tapered portion 12 formed in a radially outer direction G from the flat surface 11 toward the rivet fixing hole 6, and a substantially trapezoidal shape in cross section (in the middle) with uniform height is formed by using a radially inner surface parallel to the protruding direction T and a bottom surface of the rising portion 10 parallel to the flat surface 11. Figure 5 In this way, by forming the rising portion 10 into a substantially trapezoidal shape in cross section, the rivet R is supported by the flat portion 11 and the rising portion 10 is further supported by the bottom surface wider than the rivet R. This makes it easier to bear the pressure of the rivet R more stably than in a case where the rising portion is formed into a substantially rectangular parallelepiped shape in cross section and the surface supporting the rivet R and the surface supporting the rising portion have substantially the same area.

[0035] In addition, since the other structures of the clamping device 1 are the same as those of the conventional clamping device, the detailed description is omitted.

[0036] Next, use Figure 6 to Figure 9 A method for manufacturing the clamping device 1 according to the present embodiment will be described.

[0037] Here, the step of forming the rising portion 10 of the rivet fixing hole 6 by burring in the manufacturing process of the clamp device 1 is described in detail, and the other steps are the same as the conventional steps, and thus the description thereof is omitted.

[0038] First, if Figure 6 As shown, the following pre-hole forming process is performed: the plate material 20 which becomes the basis of the first member 2 and / or the second member 3 is punched out, and the pre-hole 10A is formed by punching, etc. At this time, considering the ejection shape of the mold and the jig, a tapered hole is formed as the pre-hole 10A.

[0039] Then, if Figure 7 to Figure 9 As shown in FIG. 1 , the following flanging process is performed: a raised portion 10 is formed in the pre-hole 10A by flanging. In the flanging process, as shown in FIG. Figure 7 As shown, a punch 50 and a die 60 are provided. The punch 50 has a punch body 51 formed to have a larger diameter than the pilot hole 10A. The die 60 receives the punch 50 .

[0040] The punch 50 includes a punch body 51 inserted into the die 60 and a punch flange 52 formed in a flange shape on the upper portion of the punch body 51. In addition, a punch curved portion 53 with an R-shaped rounded corner is formed at the top end of the punch body 51 so that the plate 20 at the pre-hole 10A portion can be smoothly pressed to deform it.

[0041] The die 60 has a stepped structure including an upper hole 61 with a large diameter and a lower hole 62 with a small diameter. The lower hole 62 is formed to have a diameter substantially the same as that of the punch 50 .

[0042] Furthermore, the pre-hole 10A of the plate 20 is arranged on the upper hole portion 61 of the die 60 in such a manner that the side with a smaller diameter of the tapered portion becomes the punch 50 side. In addition, depending on the shape and size of the pre-hole 10A, the pre-hole 10A of the plate 20 may sometimes be arranged on the upper hole portion 61 of the die 60 in such a manner that the side with a larger diameter of the tapered portion becomes the punch 50 side.

[0043] Then, the punch 50 is punched through the upper hole portion 61 to the lower hole portion 62. Here, the plate 20 at the periphery of the pre-hole 10A is bent toward the die 60, and is extruded toward the portion surrounded by the punch body 51 of the punch 50 and the upper hole portion 61 of the die 60, thereby forming the rising portion 10. At this time, in the process of forming the rising portion 10, the bent portion is pressed toward the lower hole portion 62 and abuts against the lower surface of the upper hole portion 61, and the plate 20 is further pressed by the punch flange portion 52 of the punch 50, so that the portion abutting against the lower surface of the upper hole portion 61 is further compressed to form the flat portion 11, thereby forming the rising portion 10 of uniform height.

[0044] At this time, the rising portion 10 is extruded toward the portion 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, thereby abutting against the lower surface of the upper hole portion 61, forming a planar portion 11 at the top end of the protruding direction T in a direction approximately orthogonal to the protruding direction T, and forming a tapered portion 12 from the planar portion 11 toward the radial outer direction G of the rivet fixing hole 6, forming a cross-sectional approximately trapezoidal shape (the shape shown by the double dotted line) having uniform heights of the planar portion 11 and the tapered portion 12.

[0045] In addition, the clamping device of this embodiment is not limited to the above-mentioned clamping device, and may also be, for example, Figure 3 and Figure 4 The clamping device 1A is shown. The clamping device 1A holds and fixes rod-shaped or cylindrical target members P1 and P2 (here, both are metal tubes) at different angles. Figure 3 and Figure 4 As shown in FIG. 1 , the clamping device 1A includes a first member 2A and a second member 3A made of metal, each formed into a curved shape (or a bent shape) so as to sandwich the target member P1, and a first member 2B and a second member 3B made of metal, each formed into a curved shape (or a bent shape) so as to sandwich the target member P2. In addition, the first members 2A, 2B and the second members 3A, 3B are connected to the target member P1. Figure 5The first member 2 and the second member 3 shown in the figure are similarly provided with rivet fixing holes 6A and 6B respectively provided in the first member 2A and 2B and the second member 3A and 3B, and the rotating parts 5A and 5B that can rotate mutually are formed. With such a structure, it is configured that: the first member 2A and 2B and the second member 3A and 3B are rotated to sandwich the target member P1 and P2, and on this basis, the fastening members 4A and 4B (here, fastened by bolt-shaped members) provided between the first member 2A and 2B and the second member 3A and 3B are fastened, thereby fixing the target member P1 and P2.

[0046] In addition, at least one of the rivet fixing holes 6A and 6B (here, the rivet fixing holes 6A and 6B of the first members 2A and 2B) is connected to the Figure 5 The rivet fixing holes 6 shown are similarly formed so that the peripheral edge portions of the rivet fixing holes 6A and 6B are formed into raised portions 10 raised by flanging. The raised portions 10 are similar to the aforementioned raised portions 10 and are configured so that the height of the raised portions is uniformly set over the entire peripheral edge portion of the rivet fixing holes 6.

[0047] As described above, according to the present embodiment, by forming the peripheral portion of the rivet fixing hole 6, 6A, 6B of the rotating portion 5, 5A, 5B of the clamping device 1, 1A with a flange processing to form a rising portion 10 of a uniform specified height around the entire circumference, stable rivet fixing can be performed, and as a result, the stability of the rotating portion 5, 5A, 5B of the clamping device 1, 1A can be improved.

[0048] In addition, according to the present embodiment, the rising portion 10 is roughly trapezoidal in cross-section, having a flat portion 11 on the protruding direction side and a tapered portion 12 facing radially outward of the rivet fixing holes 6, 6A, 6B, so that the shape of the rising portion 10 can be more stable, and more stable rivet fixing can be performed. As a result, the stability of the rotating portion 5, 5A, 5B of the clamping device 1, 1A can be further improved.

[0049] In addition, according to the present embodiment, the rising portion 10 of the rivet fixing hole 6, 6A, 6B is formed by flanging using the punch 50 and the die 60 of the step structure, so that the rising portion 10 with a uniform predetermined height around the entire circumference can be formed. As a result, stable rivet fixing can be performed, and the stability of the rotating portion 5, 5A, 5B of the clamping device 1, 1A can be improved.

[0050] In addition, according to the present embodiment, by forming the rising portion 10 into a roughly trapezoidal shape in cross-section having a flat portion 11 on the protruding direction side and a tapered portion 12 facing radially outward of the rivet fixing holes 6, 6A, 6B, a rising portion 10 with a more stable shape can be formed. As a result, more stable rivet fixing can be performed, and the stability of the rotating portion 5, 5A, 5B of the clamping device 1, 1A can be further improved.

[0051] In addition, the present invention is not limited to the structure and use conditions as in the above-mentioned embodiment, and can also be applied to other structures and other use conditions.

[0052] For example, in the aforementioned embodiment, the case where the rising portion is formed in the rivet fixing hole in the rotating part of the clamping device by flanging is described, but the invention is not limited thereto, and the rising portion of the present invention may also be formed in the rivet fixing hole other than the rotating part of the clamping device. In addition, the rising portion may also be formed in the rivet fixing hole other than the rotating part of the clamping device by the method for forming the rising portion of the present invention.

[0053] Furthermore, in the above-mentioned embodiment, the case where the present invention is applied to the clamping device is described, but the present invention is not limited to this, and the technology of the present invention can also be appropriately used in other members that are fixed by rivets.

[0054] In the above-mentioned embodiment, the punch is inserted from the smaller diameter side of the tapered preliminary hole, but the present invention is not limited thereto and the punch may be inserted from the larger diameter side of the preliminary hole.

[0055] In the above-mentioned embodiment, the preliminary hole is formed in a tapered shape, but the present invention is not limited thereto, and the present invention can be applied even if the preliminary hole is formed in a non-tapered shape so as to have the same diameter on the front and back sides of the plate.

[0056] Description of Reference Numerals

[0057] 1. Clamping device; 1A. Clamping device; 2. First member; 2A. First member; 2B. First member; 3. Second member; 3A. Second member; 3B. Second member; 4. Fastening member; 4A. Fastening member; 4B. Fastening member; 5. Rotating portion; 5A. Rotating portion; 5B. Rotating portion; 6. Rivet fixing hole; 6A. Rivet fixing hole; 6B. Rivet fixing hole; 10. Standing portion; 10A. Pre-hole; 11, flat portion; 12, tapered portion; 20, plate; 50, punch; 51, punch body; 52, punch flange portion; 53, punch curved portion; 60, die; 61, upper hole portion (large diameter portion); 62, lower hole portion (small diameter portion); G, radial outer direction; P, tube (target component); P1, tube (target component); P2, tube (target component); R, rivet; T, protruding direction.

Claims

1. A clamping device for holding and fixing a rod-shaped or tubular target member, characterized in that: The clamping device includes a first member and a second member for clamping the target member. The first member and the second member are configured such that rivets are fixed to rivet fixing holes respectively provided in the first member and the second member to form rotating parts that can rotate with each other, the first member and the second member are rotated to sandwich the object member, and a fastening member provided between the first member and the second member is fastened to fix the object member. At least one of the rivet fixing holes is formed so that the peripheral edge of the rivet fixing hole becomes a raised portion raised by flanging. The rising portion is configured such that the rising height becomes a uniform predetermined height over the entire circumference.

2. The clamping device according to claim 1, characterized in that: The rising portion has a substantially trapezoidal shape in cross section having a uniform height and having a flat portion formed on the protruding direction side and a tapered portion formed from the flat portion toward the radially outer side of the rivet fixing hole.

3. A method for manufacturing a clamping device for holding and fixing a rod-shaped or tubular target member, characterized in that: When forming a rivet fixing hole constituting a rotating portion that allows the first member and the second member sandwiched between the target member to rotate freely, the present invention has: a pre-hole forming step of forming a pre-hole in a plate material serving as the first member and / or the second member; as well as The flanging process is to form a raised portion on the pre-hole by flanging. In the flanging step, a punch having a larger diameter than the pre-hole and a die receiving the punch are provided. The die has a stepped structure with an upper hole portion having a large diameter and a lower hole portion having a small diameter, wherein the lower hole portion is formed to have a diameter substantially the same as that of the punch. The pre-hole of the plate is arranged on the upper hole portion of the die, and the punch is made to punch out to the lower hole portion through the upper hole portion, so that the plate around the pre-hole is bent toward the die and extruded toward the portion surrounded by the punch and the upper hole portion to form the rising portion, which is pressed toward the lower hole portion so as to abut against the lower surface of the upper hole portion to form the rising portion of uniform height.

4. The method for manufacturing a clamping device according to claim 3, characterized in that: The raised portion is extruded toward a portion surrounded by the punch and the upper hole portion, and is pressed toward the lower hole portion, thereby abutting against the lower surface of the upper hole portion, forming a roughly trapezoidal shape in cross-section with a uniform height having a planar portion on the protruding direction side and a tapered portion extending from the planar portion toward the radially outer side of the rivet fixing hole.

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