JPH08121419A - Clamping jig - Google Patents

Abstract

PURPOSE: To provide a clamping jig capable of easily and correctly clamping a work, and easily setting the clamped work to different machining machines. CONSTITUTION: A clamping jig is provided with a hole 10 for receiving a work to be clamped, a jig body 2 in which a groove 12 is provided in the neighborhood of the hole 10 to form an elastic deformation part 30, and a pressure regulating means 3 which is mounted to the jig body 2 so that it can be freely loaded and unloaded, and which pressurizes the elastic deformation part 30 to clamp the work received in the hole to the jig body 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp jig most suitable for clamping a work such as a round bar.

[0002]

2. Description of the Related Art There is a case where a work such as a round bar is attached to a jig for positioning, and the jig is fixed with a vise to perform a predetermined process on the work. Then, after performing a predetermined processing on the work, the work is removed from the jig, the next work is attached to the jig and positioned, and the same predetermined processing is performed. A large number of works are attached and processed in this manner.

[0003]

However, since this type of jig requires accurate positioning of the work, it is expensive and has a complicated structure, and only one work can be attached to the jig at a time. I can't. Therefore, the advent of a clamp jig for a work, which is inexpensive, has a simple structure, and which allows repeated replacement of the work and accurate positioning, has been desired.

Therefore, the present invention has been made in order to solve the above problems, and it is possible to easily and accurately clamp a work, and also to set the clamped work on different processing machines. The purpose is to provide a clamp jig that can be used.

[0005]

According to the present invention, there is provided a jig in which an elastically deformable portion is formed by forming a hole into which a work to be clamped is inserted and a groove near the hole. A clamp including a main body and pressure adjusting means that is removably attached to the jig main body and applies pressure to the elastically deformable portion to clamp the work in the hole into the jig main body. With a jig
Achieved. In the present invention, preferably the groove is
It is formed through the jig body. In the present invention, the hole preferably has a substantially circular cross section. In the present invention, the peripheral portion of the jig body is preferably a polyhedron. In the present invention, the work is preferably a backup pin for backing up a thin workpiece.

[0006]

According to the above construction, in the present invention, the work to be clamped is put into the hole of the jig body. Then, the pressure adjusting means is attached to the jig body to apply a pressure to the elastically deforming portion, and the work already in the hole is pressed against the inner peripheral surface defining the hole of the jig body. As a result, the work is securely clamped to the jig body. In the present invention, preferably, when the groove is formed through the jig body, it is possible to clamp over the entire length of the work put in the hole. In the present invention, preferably, the hole has a substantially circular cross section so that a rod-shaped work can be clamped. In the present invention, preferably, when the peripheral portion of the jig body is a polyhedron, the workpiece can be indexed by rotating and positioning the jig body with respect to the table of the processing machine. In the present invention,
If the work is a backup pin for backing up the thin workpiece, chattering of the thin workpiece can be prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are attached, but the scope of the present invention is, unless otherwise stated to limit the present invention, in the following description.
It is not limited to these modes.

FIG. 1 shows a preferred embodiment of the clamp jig of the present invention, and FIG. 2 is a plan view of the clamp jig. 1 and 2, the clamp jig 1 has a jig body 2 and a push screw 3 as a pressure adjusting means attached to the jig body 2. The jig body 2 is
In the embodiment shown in FIGS. 1 and 2, the first surface 4, the second surface 5, the third surface 6, the fourth surface 7, and the fifth surface are cubic or rectangular parallelepiped.
It has a surface 8 and a sixth surface 9. The fifth surface 8 is the upper surface and the sixth surface 9 is the lower surface.

The jig body 2 has a hole 1 for inserting a work.
It has 0 and a through groove 12. The hole 10 for inserting the work is also called a blank (material) insertion hole, and is a hole having a substantially circular shape or a shape similar to a circular shape in cross section. The work insertion hole 10 is formed so as to extend from the fifth surface 8 to the sixth surface 9. Near the work insertion hole 10, the through groove 1
2 is formed. The through groove 12 is formed so as to extend from the fifth surface 8 to the sixth surface 9. Through groove 12
Has a first portion 12a, a second portion 12b, a third portion 12c, and an elastic deformation hole 12d. The elastically deformable portion 12d has a circular cross section.

As shown in FIGS. 1 and 2, the first portion 12a
One end of is connected to the work insertion hole 10 and
The other end is connected to one end of the second portion 12b. The other end of the second portion 12b is connected to one end of the third portion 12c. The other end of the third portion 12c is connected to the elastic deformation hole 12d. Inner wall of second portion 12b and work insertion hole 1
The inner peripheral walls of 0 are arranged close to each other. Work insertion hole 10, first portion 12a, second portion 12b, third portion 12
A portion surrounded by c and the elastic deformation hole 12d is an elastic deformation portion 30.

The push screw 3 has the elastically deforming portion 30 shown in FIG.
This is for adjusting the movement in the arrow X direction 1 and the arrow X direction 2. The push screw 3 has a hexagonal hole 3a. For example, by inserting a tool into the hexagonal hole 3a and rotating the push screw 3, the push screw 3 can be moved in the direction of arrow X1 or the direction of arrow X2. You can As a result, the elastically deformable portion 30 is pressed against or separated from the work (see FIG. 3) inserted into the work insertion hole 10.

FIG. 3 shows an example of clamping a cylindrical work 40 using the clamp jig 1 shown in FIGS. The cylindrical work 40 is also called a blank (material), and is like the cylindrical work 40a or another work 40b as shown in FIG. In FIG.
A cylindrical work 40 is axially inserted into the work insertion hole 10 of the jig body 2. Next, by rotating the push screw 3 with a tool, the push screw 3 is moved in the arrow X1 direction. As a result, the elastically deformable portion 30 can press the work 40 entirely against the inner wall of the work insertion hole 10 and reliably clamp it.

With the cylindrical work 40 clamped in this manner, the clamp jig 1 is set on the table of a milling machine or a machining center. Then, for example, as shown in FIG.
Are processed to form the required portion 60.

Next, the jig body 2 of the clamp jig 1 is removed from the table of the milling machine or the machining center, and is set on the table 70 of the wire cut electric discharge machine, for example, as shown in FIG. Then, the portion 60 is processed by the wire electrode wire 71 of the wire cut electric discharge machine to form the portion 62 as shown in FIG.

Next, the jig body 2 of the clamp jig 1 is removed from the table 70 of the wire cut electric discharge machine, and the clamp jig 1 is fixed to the mounting portion 80 of another electric discharge machine shown in FIG. The tool main body 2 is fixed with screws 83. The fixed cylindrical work 40 of the jig body 2 functions as an electrode of the electric discharge machine. As a result, it is possible to perform electric discharge machining on a work (not shown) in the mold 58 by using the work 40 having a cylindrical shape that serves as an electrode.

As shown in FIGS. 3 to 6, the cylindrical work 40 is securely clamped to the jig body 2 of the clamp jig 1, and the clamp jig 1 and the cylindrical work 4 are clamped.
0 is set on the table of a milling machine or a machining center, and after machining, the clamp jig 1 is removed and set on the table 70 of the wire cut electric discharge machine shown in FIG. Then, after the machining is completed, the clamp jig 1 is removed from the table 70 of the wire cut electric discharge machine and attached to the attachment portion 80 of the electric discharge machine shown in FIG. During the work of setting and resetting the clamp jig 1 between these steps, the first surface 4 to the fourth surface 7 of the jig body 2 shown in FIG. 1 can be used as the position indexing reference surface. . Therefore, the jig main body 2 can easily perform the directional indexing on each table, and it is not necessary to separately perform the directional positioning operation of the jig 40 in each step.

As described above, in the work jig 1 shown in FIGS. 1 and 2, the four surfaces from the first surface 4 to the fourth surface 7 are indexing surfaces. Therefore, the jig body 2 and the work can be indexed by 90 °. The present invention is not limited to this, and for example, the outer peripheral portion of the jig body 2 can be formed into a polyhedron other than four faces, for example, three faces or five faces or more. For example, the embodiment shown in FIG. 7 has a regular octagonal cross section. That is, it has an indexing surface from the first surface 104 to the eighth surface 111. As a result, the jig main body 102 and the work (not shown)
It can be calculated by °.

FIG. 8 shows an example in which the jig main body 202 of one clamp jig 201 has two or more work insertion holes 10 and through grooves 12. The jig body 202 in FIG. 8 is a so-called multiple-type jig body. The jig main body 2 of FIG. 1 and the jig main body 102 of FIG. 7 are each a single-type jig main body.

FIG. 9 shows an embodiment in which the clamp jig of the present invention is used for backing up a thin work piece.
This backup clamp jig 1 has the same structure as the clamp jig shown in FIG. The backup pin 400 is inserted into the work insertion hole 10. One end of the spring 430 is in contact with the hole 410 of the backup pin 400. The other end of the spring 430 hits the bottom of the jig body 2, for example. When clamping the backup pin 400 to the jig body 2, set screw 3
It can be performed in the same manner as the embodiment of FIG. 1 by turning.
The backup pin 400 can be used to prevent chattering of an extremely thin work piece (not shown) by using the force of the spring 430 in order to prevent deformation of a thin work piece such as a casting. it can.

In the above-described embodiment of the clamp jig, the jig main body of the clamp jig can be made of elastically deformable metal, plastic, ceramics or the like. The material of the jig body of the clamp jig is, for example, SKD1.
Steel such as 1 can be adopted. The jig body is not particularly limited as long as it is a material having elastic deformation. The through groove can be formed by, for example, wire cut electric discharge machining. The through groove is connected to a through hole into which a work such as a round bar is inserted and constitutes an elastically deformable portion (movable portion) 30.

By operating a pressure adjusting means such as a push screw, a work such as a round bar is held and clamped against the inner surface of the work insertion hole. The work insertion hole has a predetermined size, and the diameter of the work to be inserted into this work insertion hole is also preset. The tighter the setting tolerances of this workpiece insertion hole dimension and workpiece diameter dimension,
Workpieces can be positioned with high accuracy. Moreover,
Since the work can be clamped over the entire circumference of the work on the inner surface of the work insertion hole, a strong holding force can be exerted.

In the work of fixing the jig body with a vise or the like and exchanging a work such as a round bar, the work of repeatedly positioning the round bar in the jig body can be accurately performed. Therefore, the setup time (centering time) for positioning the round bar can be significantly reduced. The more accurately the workpiece insertion hole and the diameter of the workpiece or the dimension of the workpiece are processed and set, the smaller the deviation when tightening the workpiece, and the more accurately the positioning can be performed. Since the elastic deformation hole 12d is provided, the elastic deformation portion 30 can maintain a permanent elastic deformation ability without causing deformation such as composition deformation.

As illustrated in FIG. 9, the clamp jig of the present invention is inexpensive and has a simple structure, and it is possible to repeatedly replace the work pieces and perform accurate positioning. Moreover, the clamp jig of the present invention can be used not only as a backup jig for a thin workpiece, but also as an abutting jig for a workpiece.

[0024]

As described above, according to the present invention, the work can be clamped easily and accurately, and
The clamped work can be easily set on different processing machines.

[Brief description of drawings]

FIG. 1 is a perspective view showing a clamp jig of the present invention.

FIG. 2 is a plan view of the clamp jig shown in FIG.

FIG. 3 is a diagram showing an application example of the clamp jigs of FIGS. 1 and 2.

FIG. 4 is a view showing an example in which the clamp jig shown in FIG. 3 is set in a wire cut electric discharge machine.

FIG. 5 is a view seen from an arrow A in FIG.

FIG. 6 is a diagram showing an example in which the clamp jig of FIG. 4 is set as a holding portion of another electric discharge machine.

FIG. 7 is a view showing another embodiment of the clamp jig of the present invention.

FIG. 8 is a view showing still another embodiment of the clamp jig of the present invention.

FIG. 9 is a perspective view showing an application example of the jig body of the present invention.

[Explanation of symbols]

 1 Clamp Jig 2 Jig Main Body 3 Push Screw (Pressure Adjusting Means) 10 Work Insertion Hole (Work Insert Hole) 12 Through Groove (Groove) 30 Elastic Deformation Part 40 Work 400 Backup Pin

Claims (5)

[Claims] 1. A hole into which a work to be clamped is inserted, a jig main body in which an elastically deformable portion is formed by forming a groove near the hole, and a jig detachably attached to the jig main body. A clamp jig, comprising: pressure adjusting means for applying a pressure to the elastically deformable portion to clamp the work in the hole on the jig body. 2. The clamp jig according to claim 1, wherein the groove is formed through the jig body. 3. The hole has a substantially circular cross section.
Alternatively, the clamp jig according to claim 2. 4. The clamp jig according to claim 1, wherein a peripheral portion of the jig body is a polyhedron. 5. The clamp jig according to claim 1, wherein the work is a backup pin for backing up a thin workpiece.