JP2016118227A - Clamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a workpiece to be easily fastened by a C shaped clamp to facilitate processing work such as perforation.SOLUTION: An attachment 20 is added to a C shaped clamp 10 to form a clamp device 1. The C shaped clamp 10 includes: a C shaped body 11; a sheet part 12 provided at one end part of the body 11; and a clamper 14 provided at the other end part of the body 11. The clamper 14 may move close to or away from the sheet part 12 in an axial direction. A first magnet 41 is housed in an attachment body 21. The attachment body 21 is attached to the sheet part 12. The first magnet 41 attracts a workpiece 9 on a support surface 22 of the attachment body 21.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a clamping device that clamps a workpiece, and more particularly, to a clamping device suitable for various machining operations by a machine tool.

  For example, when drilling with a drilling machine at a predetermined position of a workpiece made of a metal plate, it is convenient to use a master workpiece and a C-type clamp. The master work has the same shape and dimensions as the work, and a hole is formed in advance in the predetermined portion of the master work. The master work is superposed on the upper surface of the work, and the master work and the work are fastened and fixed with a C-shaped clamp. Then, by drilling the drilling machine into the workpiece through the hole of the master workpiece, a hole is made in a predetermined portion of the workpiece.

JP 2008-75869 A

The C-type clamp can be used not only for drilling work but also for gripping and fixing a workpiece during spot welding, wire drawing work, and various work. In any of the operations, if the C-type clamp screw is not tightened strongly, the work will be loose and difficult to work. However, the tightening operation of the C-type clamp screw is complicated. In particular, it is not easy to overlap and tighten the workpiece and the master workpiece.
In view of the above circumstances, an object of the present invention is to easily tighten a workpiece with a C-type clamp, and to facilitate machining operations such as drilling.

In order to solve the above problems, the present invention is a clamping device for clamping a workpiece,
C type clamp and attachment,
The C-type clamp includes a C-type body, a seat part provided at one end of the body, and a clamper provided at the other end of the body, the clamper being attached to the seat part It can be approached and separated in the axial direction,
The attachment includes an attachment body having a support surface for supporting the workpiece and attached to the seat portion, and a first magnet housed in the attachment body, wherein the first magnet and the clamper are: Opposing in the axial direction.
According to this clamping device, the workpiece can be magnetically attracted to the sheet portion by the first magnet. Accordingly, the workpiece can be easily clamped and clamped stably and securely by the C-shaped clamp. Therefore, the processing of the workpiece can be facilitated.

  It is preferable that the attachment main body is made of a magnetic metal, and a housing recess is formed on the support surface, and the first magnet is housed in the housing recess and is attracted to the inner bottom surface of the housing recess. Thereby, a 1st magnet can be easily and reliably attached to an attachment main body.

It is preferable that the first magnet is retracted from the support surface.
Thereby, the magnetic attraction force between the first magnet and the attachment body can be made stronger than the magnetic attraction force between the first magnet and the workpiece. When the workpiece is separated from the clamping device after processing, the workpiece can be reliably pulled away from the attachment while preventing the first magnet from being detached from the attachment body.

Preferably, the first magnet is covered with a first cover member made of a nonmagnetic material, and an outer surface of the first cover member is flush with the support surface.
As a result, the work can be stably held on the attachment. The outer surface of the first cover also constitutes a part of the support surface. Further, by interposing the cover between the first magnet and the work, it is possible to reliably prevent the first magnet from being detached from the attachment body when the work is separated from the clamping device.

A clamping device that clamps a workpiece by overlapping it with a master workpiece,
C type clamp and attachment,
The C-type clamp includes a C-type body, a seat part provided at one end of the body, and a clamper provided at the other end of the body, the clamper being attached to the seat part It can be approached and separated in the axial direction,
The attachment includes an attachment body having a support surface for supporting the workpiece and attached to the seat portion; a first positioning convex portion and a second positioning convex portion provided on the support surface; It is preferable that two sides of the workpiece intersect each other are applied to the second positioning convex portion.
As a result, the workpiece can be accurately positioned and fixed to the attachment. Therefore, the processing of the workpiece can be facilitated.

  It is preferable that the attachment main body is provided with a second magnet that is attracted to the sheet portion. Thereby, the attachment can be easily attached to and detached from the C-shaped clamp.

  It is preferable that the attachment main body is fixed to the seat portion with a screw. Thus, the attachment can be easily attached and fixed to the C-shaped clamp.

  The attachment main body is preferably formed with a fitting groove into which the seat portion is fitted. Thereby, the attachment can be easily attached to the C-shaped clamp.

  According to the present invention, the workpiece can be easily clamped by the C-shaped clamp, and the machining of the workpiece can be facilitated.

FIG. 1 is a side view showing a clamping device according to a first embodiment of the present invention in a state where a workpiece and a master workpiece are clamped. FIG. 2 is a plan view taken along line II-II in FIG. FIG. 3 is an exploded perspective view of the clamp device. FIG. 4 is a front sectional view of the clamping device taken along line IV-IV in FIG. FIG. 5 is a perspective view of the attachment of the clamp device. FIG. 6 is an exploded perspective view of the clamp device according to the second embodiment of the present invention. FIG. 7 is a front cross-sectional view showing the clamping device according to the second embodiment in a state where the workpiece and the master workpiece are clamped. FIG. 8 is an exploded perspective view of the clamp device according to the third embodiment of the present invention. FIG. 9 is an exploded perspective view of the attachment of the clamp device according to the third embodiment as viewed from an angle different from that of FIG. FIG. 10 is a plan view of the attachment according to the third embodiment, and shows a workpiece and a master workpiece arranged thereon by a two-dot chain line. FIG. 11 is a front sectional view showing the clamping device according to the third embodiment in a state where the workpiece and the master workpiece are clamped. FIG. 12 is an exploded perspective view of the clamp device according to the fourth embodiment of the present invention. FIG. 13 is a plan view of an attachment of the clamp device according to the fourth embodiment, and shows a workpiece and a master workpiece arranged thereon by a two-dot chain line. FIG. 14 is a front sectional view showing the clamping device according to the fourth embodiment in a state where the workpiece and the master workpiece are clamped. FIG. 15 is a front cross-sectional view showing a clamping device according to a fifth embodiment of the present invention in a state where a workpiece and a master workpiece are clamped.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment (FIGS. 1 to 5)]
1 to 5 show a first embodiment of the present invention. As shown in FIG.1 and FIG.2, the workpiece | work 9 of this embodiment is comprised with magnetic metals, such as iron and steel, for example, has a rectangular flat plate shape. The master work 8 has the same material, the same shape, and the same dimensions as the work 9, and is provided with holes 8a at one or more predetermined locations. Here, using a machine tool such as a drilling machine (not shown), for example, the hole 8a is used as a guide to make a hole at the same location as the hole 8a in the workpiece 9. At the time of drilling, the master work 8 and the work 9 are clamped and fixed by the clamping device 1.

  As shown in FIG. 1, the clamp device 1 includes a C-type clamp 10 and an attachment 20. The C-type clamp 10 is a commercially available and general-purpose clamp, and has a body 11, a seat portion 12, and a clamper 14. The body 11 is formed in a C shape (a U shape). Both ends in the circumferential direction of the body 11 are opposed to each other along the axis L. A sheet portion 12 is integrally provided at one end portion of the body 11 in the circumferential direction (lower end portion in FIG. 1). The seat portion 12 has a flat trapezoidal shape and is directed to an end portion (upper side in FIG. 1) on the opposite side of the body 11 in the circumferential direction. The material of the body 11 and the seat portion 12 is made of a magnetic metal such as steel. A pair of screw insertion holes 12d, 12d are formed in the sheet portion 12.

  A holder nut 13 is provided at the other end of the body 11 (the upper end in FIG. 1). A clamper 14 is attached to the holder nut 13. The clamper 14 includes a clamp shaft 15, a clamp disk 16, and a clamp lever 17. The clamp shaft 15 is configured by a male screw extending linearly along the axis L. The clamp shaft 15 is screwed to the holder nut 13. A clamp disk 16 is provided at one end (lower end) of the clamp shaft 15. The clamp disk 16 and the sheet portion 12 face each other in the direction along the axis L. A clamp lever 17 is provided at the other end (upper end) of the clamp shaft 15. By rotating the clamp lever 17, the clamper 14 is approached and separated along the axis L with respect to the sheet portion 12.

  As shown in FIG. 3, the attachment 20 is attached to the C-shaped clamp 10. As shown in FIG. 4, the attachment 20 includes an attachment member 21 (attachment body) and a first magnet 41. As shown in FIG. 5, the attachment member 21 is made of a magnetic metal such as iron or steel and has a cylindrical shape. As shown in FIG. 4, the attachment member 21 is placed on the seat portion 12. The axis of the attachment member 21 is along the axis L. On the bottom surface 24 of the attachment member 21, a pair of female screw holes 24d and 24d are formed. As shown in FIG. 3, the female screw holes 24d and 24d and the screw insertion holes 12d and 12d are aligned one to one. A fixing screw 61 is screwed into each female screw hole 24d through the screw insertion hole 12d. Accordingly, the attachment member 21 and the attachment 20 are detachably attached to the seat portion 12.

  The upper surface of the attachment member 21 constitutes the support surface 22. The workpiece 9 and the master workpiece 8 are placed on and supported by the support surface 22. An accommodation recess 22 b is formed at the center of the support surface 22. The housing recess 22b is circular in plan view.

  As shown in FIG. 4, the 1st magnet 41 is accommodated in the accommodation recessed part 22b. The first magnet 41 has a disk shape slightly smaller in diameter than the housing recess 22b. The upper surface and the lower surface of the first magnet 41 constitute a pair of magnetic poles (N pole and S pole). The thickness of the 1st magnet 41 is smaller than the depth of the accommodation recessed part 22b. The first magnet 41 is magnetically attracted to the inner bottom surface of the housing recess 22b. The upper surface of the first magnet 41 is retracted into the housing recess 22 b rather than the support surface 22.

  As shown in FIG. 4, a first cover member 51 covers the first magnet 41. The first cover member 51 is made of a nonmagnetic material such as stainless steel or brass. The first cover member 51 may be made of resin. The first cover member 51 integrally includes a cover plate 51a and a peripheral wall 51b. The cover plate 51a has a circular plate shape. The cover plate 51a has a thickness of about 1 mm, for example. This cover plate 51 a covers the upper surface of the first magnet 41. The upper surface (outer surface) of the cover plate 51 a is flush with the support surface 22. Thus, the upper surface of the cover plate 51a also forms part of the support surface 22.

  A cylindrical peripheral wall 51b extends downward from the outer peripheral edge of the cover plate 51a. The peripheral wall 51b surrounds the outer peripheral surface of the first magnet 41, and is fitted between the outer peripheral surface of the first magnet 41 and the inner peripheral surface of the housing recess 22b.

  Although detailed illustration is omitted, the outer peripheral surface and the upper surface of the first magnet 41 and the inner surface of the first cover member 51 are bonded with an adhesive. Moreover, the outer peripheral surface of the 1st cover member 51 and the inner peripheral surface of the accommodation recessed part 22b are adhere | attached with the adhesive agent.

The usage example of the clamp apparatus 1 is demonstrated.
The workpiece 9 is inserted between the attachment 20 and the clamp disk 16 and is applied to the upper surface of the attachment 20.
Then, the work 9 is attracted to the upper surface of the attachment 20 by the magnetic force of the first magnet 41. Thereby, the workpiece 9 can be stably arranged on the attachment 20.
Further, the master work 8 is superposed on the work 9, and the edges of the master work 8 and the work 9 are made to coincide with each other.

  Then, the clamp lever 17 is turned to lower the clamper 14 and press the clamp disk 16 against the upper surface of the master work 8. Thus, the master work 8 and the work 9 are sandwiched between the clamper 14 and the attachment 20. Accordingly, the master work 8 and the work 9 can be firmly fixed so as not to be displaced from each other.

Subsequently, the master workpiece 8 and the workpiece 9 clamped by the clamping device 1 are set on a table of a drilling machine (not shown). Then, a drill on the drilling machine is passed through the hole 8 a of the master work 8 to make a hole in the work 9.
Thereby, a hole can be made in the same location as the hole 8a in the workpiece 9. Since the master device 8 and the workpiece 9 can be stably fixed by the clamping device 1, in particular, the workpiece 9 can be attracted to the attachment 20 and stably fixed by the magnetic force of the first magnet 41. Processing can be performed easily.

The use of the clamping device 1 is not limited to the drilling of the workpiece 9.
The workpiece 9 can be clamped by the clamp device 1 and spot-welded. Since the workpiece 9 can be supported by gripping the C-shaped clamp 10, it is not necessary to directly grip the workpiece 9 even when the workpiece 9 is heated to high temperature by welding heat. Therefore, the welding operation can be prevented from being hindered.

  Alternatively, the workpiece 9 can be clamped by the clamping device 1 and the drawing can be performed on the workpiece 9.

  After completion of the work, the clamper 14 is moved upward to release the clamp of the workpiece 9 and the like. Subsequently, the workpiece 9 and the like are separated from the first magnet 41. The magnetic pole on the lower surface side of the first magnet 41 and the attachment member 21 are in direct contact with each other, and the magnetic pole on the upper surface side of the first magnet 41 and the workpiece 9 are nonmagnetic first covers. Since it is attracted via the member 51, the magnetic attracting force with the attachment member 21 is stronger than the magnetic attracting force with the work 9. Therefore, when the work 9 is pulled away from the first magnet 41, the first magnet 41 does not come out of the housing recess 22b.

Next, another embodiment of the present invention will be described. In the following embodiments, the same reference numerals are given to the drawings for the same configurations as those already described, and the description thereof is omitted.
[Second Embodiment (FIGS. 6 to 7)]
6 and 7 show a second embodiment of the present invention.
As shown in FIG. 6, the attachment 20 </ b> B of the clamping device 1 </ b> B of the second embodiment has a cylindrical shape with a larger diameter than the attachment 20 of the first embodiment (FIG. 3). As shown in FIG. 7, the attachment 20 </ b> B includes an attachment member 21 </ b> B (attachment main body) and a pair of upper and lower magnets 41 and 42. Two magnets 41 and 42 are accommodated in the attachment member 21B.

  More specifically, as shown in FIG. 7, a circular housing recess 22b is formed on the upper surface (support surface 22) of the attachment member 21B, and a circular housing recess 24b is formed on the bottom surface 24 of the attachment member 21B. Yes. A partition wall 21g is formed between the upper and lower housing recesses 22b and 24b of the attachment member 21B. Similarly to the second embodiment, the first magnet 41 is housed in the upper housing recess 22b, and the first magnet 41 is magnetically attracted to the upper surface of the partition wall 21g (the inner bottom surface of the housing recess 22b). A first cover member 51 is put on the first magnet 41.

  The second magnet 42 is housed in the lower housing recess 24b. The second magnet 42 has a disk shape that is slightly smaller in diameter than the housing recess 24b. The upper surface and the lower surface of the second magnet 42 constitute a pair of magnetic poles. The thickness of the 2nd magnet 42 is smaller than the depth of the accommodation recessed part 24b. The upper surface of the second magnet 42 is magnetically attracted to the lower surface of the partition wall 21g (the upper bottom surface of the housing recess 24b). The lower surface of the second magnet 42 is retracted into the housing recess 24b from the bottom surface 24 of the attachment member 21B.

  The first magnet 41 and the second magnet 42 face each other up and down along the axis L with the partition wall 21g of the attachment member 21B interposed therebetween. The second magnet 42 has the same size as the first magnet 41, but may be different in size from the first magnet 41.

  As shown in FIG. 7, the second cover member 52 covers the lower side portion of the second magnet 42. The second cover member 52 is made of a nonmagnetic material such as stainless steel or brass. The second cover member 52 may be made of resin. The second cover member 52 integrally includes a cover plate 52a and a peripheral wall 52b. The cover plate 52a has a circular plate shape. The cover plate 52a has a thickness of about 1 mm, for example. This cover plate 52 a covers the lower surface of the second magnet 42. The lower surface (outer surface) of the cover plate 52a is flush with the bottom surface 24 of the attachment member 21B. A cylindrical peripheral wall 52b extends upward from the outer peripheral edge of the cover plate 52a. The peripheral wall 52b surrounds the outer peripheral surface of the second magnet 42, and is fitted between the outer peripheral surface of the second magnet 42 and the inner peripheral surface of the housing recess 24b.

  Although detailed illustration is omitted, the outer peripheral surface and the lower surface of the second magnet 42 and the inner surface of the second cover member 52 are bonded with an adhesive. Further, the outer peripheral surface of the second cover member 52 and the inner peripheral surface of the housing recess 24b are bonded with an adhesive.

  As shown in FIG. 6, the outer peripheral convex part 25 is provided in the outer peripheral part of the bottom face 24 of the attachment member 21B. The outer peripheral convex portion 25 protrudes downward from the bottom surface 24 and has an annular shape over substantially the entire periphery of the bottom surface 24. The inner diameter of the outer peripheral convex portion 25 is slightly larger than the major diameter of the substantially oval sheet portion 12. A notch 25e is formed at one place in the circumferential direction of the outer peripheral convex portion 25.

The attachment 20B is disposed on the seat portion 12. The attachment 20 </ b> B is attracted to the sheet portion 12 by the magnetic attraction force of the second magnet 42. As a result, the attachment 20B can be stably coupled to the C-type clamp 10.
Further, the outer peripheral convex portion 25 surrounds the outer periphery of the sheet portion 12. When the attachment 20 </ b> B tries to be displaced horizontally with respect to the seat portion 12, the outer peripheral convex portion 25 is caught on the outer edge of the seat portion 12. Thereby, the position with respect to the sheet | seat part 12 of the attachment 20B can be controlled.
The vicinity 11e of the seat 12 in the body 11 is inserted into the notch 25e. As a result, the attachment 20B is prevented from rotating.

The attachment member 21B is not formed with the female screw hole 24d (FIG. 4) in the attachment member 21 of the first embodiment.
Moreover, it is not necessary to provide the screw insertion hole 12d (FIG. 4) in 1st Embodiment in the sheet | seat part 12 of 2nd Embodiment.

  According to the clamp device 1 </ b> B of the second embodiment, the attachment 20 </ b> B can be easily attached to and detached from the seat portion 12 by the magnetic force of the second magnet 42. The magnetic pole on the upper surface side of the second magnet 42 and the attachment member 21B are directly magnetically attracted, whereas the magnetic pole on the lower surface side of the second magnet 42 and the sheet portion 12 are nonmagnetic second. Since the magnetic adsorption is performed via the cover member 52, the second magnet 42 can be prevented from falling off the attachment member 21B when the attachment 20B is pulled away from the seat portion 12.

[Third Embodiment (FIGS. 8 to 11)]
8 to 11 show a third embodiment of the present invention.
As shown in FIG. 11, the attachment 20 </ b> C of the clamping device 1 </ b> C of the third embodiment includes an attachment main body 30 </ b> C and magnets 41 and 42. As shown in FIG. 8, the attachment main body 30 </ b> C includes an attachment member 21 </ b> C and a support plate 31. As shown in FIG. 9, the attachment member 21C has a rectangular thick plate shape or block shape. Note that the attachment member 21C may have a circular shape as in the second embodiment (FIG. 6). At the center of the upper surface of the attachment member 21C, a mounting projection 23 is formed so as to protrude upward. The mounting convex part 23 is circular. As shown in FIG. 11, an accommodation recess 22 b is formed on the upper surface of the mounting protrusion 23. The first magnet 41 is accommodated in the accommodating recess 22b, and the first cover member 51 is covered on the first magnet 41.

  As in the second embodiment (FIG. 7), the housing recess 24b is formed on the bottom surface 24 of the attachment member 21C, and the second magnet 42 is embedded in the housing recess 24b and the second cover member 52 is covered. ing. Further, on the outer periphery of the bottom surface 24, an outer peripheral convex portion 25 with a notch 25e is provided. The attachment member 21 </ b> C and thus the attachment 20 </ b> C can be detachably attached to the seat portion 12 by the magnetic attractive force of the second magnet 42.

  As shown in FIGS. 9 and 10, the support plate 31 has a rectangular flat plate shape. The material of the support plate 31 is a metal such as iron, steel, or stainless steel. The support plate 31 may be a magnetic metal or a nonmagnetic metal. A fitting hole 31 c is formed at the center of the support plate 31. The fitting hole 31 c penetrates the support plate 31 in the thickness direction, and has a circular shape with substantially the same diameter as the mounting convex portion 23. The mounting projection 23 is fitted into the fitting hole 31c from below. The support plate 31 and the attachment member 21 </ b> C are connected by a connecting screw 36. As shown in FIG. 11, the upper surface of the support plate 31, the upper surface of the mounting convex portion 23, and the upper surface of the first cover member 51 are flush with each other to form a support surface 30 a.

  As shown in FIGS. 9 and 10, two (plural) first positioning pins 71 and 71 (first positioning protrusions) are provided on the edge of the long side of the support plate 31. The first positioning pins 71 protrude upward from the support plate 31 (front side in FIG. 10) so as to be orthogonal to the support plate 31. The upper portion of the first positioning pin 71 is a tool hook portion 71a having a hexagonal cross section, and the lower portion of the first positioning pin 71 is a cylindrical portion 71b. The lower end portion of the first positioning pin 71 is connected and fixed to the support plate 31. The two first positioning pins 71 and 71 are separated from each other along the long side direction of the support plate 31. The number of first positioning pins 71 is not limited to two, but may be three or more, or may be only one.

Two (plural) second positioning pins 72 and 72 (second positioning convex portions) are provided on the short side edge of the support plate 31. The second positioning pins 72 protrude upward from the support plate 31 (front of the page in FIG. 10) so as to be orthogonal to the support plate 31. The upper portion of the second positioning pin 72 is a tool hook portion 72a having a hexagonal cross section, and the lower portion of the second positioning pin 72 is a cylindrical portion 72b. The lower end portion of the second positioning pin 72 is connected and fixed to the support plate 31. The two second positioning pins 72 and 72 are separated from each other along the short side direction of the support plate 31. As shown in FIG. 10, the alignment direction of the second positioning pins 72 and 72 is orthogonal to the alignment direction of the first positioning pins 71 and 71.
Note that the number of the second positioning pins 72 is not limited to two, but may be three or more, or may be only one. When one of the first positioning pin 71 and the second positioning pin 72 is only one, it is preferable that the other is two or more.

As shown in FIG. 11, when using the clamping device 1C, the workpiece 9 and the master workpiece 8 are arranged on the support surface 30a of the attachment main body 30C. At this time, as indicated by a two-dot chain line in FIG. 10, one side of the workpiece 9 and the master workpiece 8 is brought into contact with the cylindrical portion 71 b of the first positioning pins 71 and 71. Further, the other side orthogonal to the one side of the workpiece 9 and the master workpiece 8 is applied to the cylindrical portion 72 b of the second positioning pins 72, 72. Thereby, the workpiece 9 and the master workpiece 8 can be easily and accurately positioned with respect to the clamping device 1C.
The point that the workpiece 9 and the master workpiece 8 can be stably fixed by attracting the workpiece 9 or the master workpiece 8 with the first magnet 41 is the same as in the above-described embodiment.

[Fourth Embodiment (FIGS. 12 to 14)]
12 to 14 show a fourth embodiment of the present invention.
As shown in FIG. 14, the attachment 20 </ b> D of the clamp device 1 </ b> D of the fourth embodiment includes an attachment body 30 </ b> D and a first magnet 41. The attachment main body 30D includes a support plate 31 and an attachment member 21D. As shown in FIG. 12, the attachment member 21D has a rectangular parallelepiped or cubic block shape. A fitting groove 26 is formed in the attachment member 21D. As shown in FIG. 14, the fitting groove 26 includes a lateral fitting groove portion 26a and a vertical fitting groove portion 26b, and has a T shape in a front sectional view. As shown in FIG. 12, the lateral fitting groove 26a is parallel to the support plate 31 and reaches the back surface 21h and the left and right side surfaces 21i, 21i of the attachment member 21D. A vertical fitting groove portion 26b extends downward from a central portion in the left-right direction of the horizontal fitting groove portion 26a. The vertical fitting groove 26b is orthogonal to the horizontal fitting groove 26a and reaches the back surface 21h and the bottom surface of the attachment member 21D.

  As shown in FIG. 14, the lower end portion of the C-shaped clamp 10 is fitted into the fitting groove 26. Specifically, the sheet portion 12 is fitted into the horizontal fitting groove portion 26a, and the lower end portion 11f of the body 11 is fitted into the vertical fitting groove portion 26b. A set screw 62 is screwed into one side surface 21i of the attachment member 21D. The axis of the set screw 62 is oriented horizontally. The back end 62b of the set screw 62 is pressed against the body tip 11f. Thereby, the C-type clamp 10 and the attachment member 21D are detachably fixed. As a result, the C-type clamp 10 and the attachment 20D are detachably fixed. On the outer peripheral surface of the head knob portion 62a of the set screw 62, a knurl for manual rotation is formed.

  The attachment convex portion 23 is formed on the upper surface of the attachment member 21D, the first magnet 41 and the first cover member 51 are accommodated in the accommodation concave portion 22b of the attachment convex portion 23, and the attachment convex portion 23 is the support plate. It is the same as that of 3rd Embodiment (FIG. 11) that the attachment member 21D and the support plate 31 are integrally connected by the fitting hole 31c of 31. As shown in FIG.

  As shown in FIG. 13, positioning plates 73 and 74 are provided on the support plate 31 of the attachment 20 </ b> D in place of the positioning pins 71 and 72. The first positioning plate 73 (first positioning convex portion) has a rectangular flat plate shape. The thickness of the first positioning plate 73 is larger than the thickness of the work 9, and preferably larger than the total thickness of the work 9 and the master work 8. The longitudinal direction of the first positioning plate 73 is directed along the edge of the long side of the support plate 31. The first positioning plate 73 is fixed to the support plate 31 with screws.

  The second positioning plate 74 (second positioning convex portion) has a rectangular flat plate shape. The thickness of the second positioning plate 74 is larger than the thickness of the workpiece 9, and preferably larger than the total thickness of the workpiece 9 and the master workpiece 8. The longitudinal direction of the second positioning plate 74 is directed along the edge on the short side of the support plate 31. The second positioning plate 74 is fixed to the support plate 31 with screws. The longitudinal direction of the first positioning plate 73 and the longitudinal direction of the second positioning plate 74 are orthogonal to each other.

As shown in FIG. 14, when using the clamping device 1 </ b> D, the workpiece 9 and the master workpiece 8 are arranged on the support plate 31. At this time, as shown by a two-dot chain line in FIG. 13, one side of the workpiece 9 and the master workpiece 8 is brought into contact with the edge of the first positioning plate 73. Further, the other side orthogonal to the one side of the workpiece 9 and the master workpiece 8 is applied to the second positioning plate 74. Thereby, the workpiece 9 and the master workpiece 8 can be easily and accurately positioned with respect to the clamping device 1D.
The point that the work 9 and the master work 8 can be stably fixed by attracting the work 9 by the first magnet 41 is the same as in the above-described embodiment.

[Fifth Embodiment (FIG. 15)]
FIG. 15 shows a fifth embodiment of the present invention.
The attachment main body 30E of the clamp device 1E according to the fifth embodiment includes an attachment member 21E and a support plate 31. The attachment member 21E has substantially the same structure as the attachment member 21D of the fourth embodiment (FIG. 14). The difference is that the first magnet 41 and the first cover member 51 are not provided in the housing recess 22b of the attachment member 21E. The housing recess 22b is a space and is opened upward. The attachment member 21E is connected and fixed to the support plate 31. The support plate 31 is provided with a first positioning pin 71 and a second positioning pin 72.

When using the clamp device 1E, the workpiece 9 and the master workpiece 8 are arranged on the support plate 31. At this time, one side of the workpiece 9 and the master workpiece 8 is brought into contact with the edge of the first positioning pin 71. Further, the other side orthogonal to the one side of the work 9 and the master work 8 is applied to the second positioning pin 72. Thereby, the workpiece 9 and the master workpiece 8 can be easily and accurately positioned with respect to the clamping device 1D.
Thereafter, the workpiece 9 and the master workpiece 8 are clamped and fixed by the C-shaped clamp 10 and then the workpiece 9 is subjected to desired processing.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, only the workpiece 9 may be clamped by the clamping devices 1 to 1E.
Attachments 20, 20D, and 20E may be fixed to the seat portion 12 by welding or the like.
You may combine the original structure of several embodiment mutually. For example, the attachment may have two or three of the screw 61, the second magnet 42, and the fitting groove 26.
In the clamping device 1 </ b> C, positioning plates 73 and 74 may be provided on the support plate 31 instead of the positioning pins 71 and 72. In the clamp device 1 </ b> D, positioning pins 71 and 72 may be provided on the support plate 31 instead of the positioning plates 73 and 74. In the clamping device 1E, positioning plates 73 and 74 may be provided on the support plate 31 instead of the positioning pins 71 and 72.
The arrangement angle between the first positioning convex portions 71 and 73 and the second positioning convex portions 72 and 74 may be adjusted to the angle of two sides where the workpieces intersect, and does not necessarily need to be orthogonal.

  The present invention can be applied to, for example, a clamp device that holds and fixes a metal workpiece.

L Axis 1, 1B to 1E Clamping device 9 Work 10 C-type clamp 11 Body 12 Seat 14 Clamper 20, 20B, 20C, 20D, 20E Attachment 21, 21B Attachment member (attachment body)
22 support surface 22b accommodating recess 26 fitting groove 30C, 30D, 30E attachment body 30a support surface 41 first magnet 42 second magnet 51 first cover member 61 fixing screw 62 set screw 71 first positioning pin (first positioning convex portion) )
72 1st positioning pin (2nd positioning convex part)
73 1st positioning plate (1st positioning convex part)
74 Second positioning plate (second positioning projection)

Claims (8)

A clamping device for clamping a workpiece,
C type clamp and attachment,
The C-type clamp includes a C-type body, a seat part provided at one end of the body, and a clamper provided at the other end of the body, the clamper being attached to the seat part It can be approached and separated in the axial direction,
The attachment includes an attachment body having a support surface for supporting the workpiece and attached to the seat portion, and a first magnet housed in the attachment body, wherein the first magnet and the clamper are: A clamping device characterized by facing in the axial direction.   The attachment main body is made of a magnetic metal, and an accommodation recess is formed on the support surface, and the first magnet is accommodated in the accommodation recess and is attracted to an inner bottom surface of the accommodation recess. The clamping device according to claim 1.   The clamp apparatus according to claim 2, wherein the first magnet is retracted from the support surface.   The clamp device according to claim 3, wherein the first magnet is covered with a first cover member made of a nonmagnetic material, and an outer surface of the first cover member is flush with the support surface. A clamping device that clamps a workpiece by overlapping it with a master workpiece,
C type clamp and attachment,
The C-type clamp includes a C-type body, a seat part provided at one end of the body, and a clamper provided at the other end of the body, the clamper being attached to the seat part It can be approached and separated in the axial direction,
The attachment includes an attachment body having a support surface for supporting the workpiece and attached to the seat portion; a first positioning convex portion and a second positioning convex portion provided on the support surface; The clamping device characterized in that two sides of the workpiece intersecting each other are applied to the second positioning convex portion.   The clamp device according to claim 1, wherein the attachment main body is provided with a second magnet that is attracted to the sheet portion.   The said attachment main body is being fixed to the said sheet | seat part with the screw, The clamp apparatus in any one of Claims 1-6 characterized by the above-mentioned.   The clamping device according to claim 1, wherein a fitting groove into which the seat portion is fitted is formed in the attachment main body.

Images