JPH0750112Y2 - Work holding device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is applicable to the case where a workpiece having a relatively small rigidity, such as a shaft head case, is machined such as a shaft bearing hole, which requires high precision. The present invention relates to a work holding device for holding the work on a support base of a machine tool.

[Prior Art] Conventionally, there is a work holding device as shown in Fig. 4 as described above. In FIG. 4, reference numeral 1 is a support base for a machine tool, and 2 is a parella provided on the support base 1. Numeral 3 is a work piece consisting of a shaft head case, and the work piece 3 has a supporting surface 3c additionally machined on the surface opposite to the mounting surface 3b which has already been machined on the outer peripheral flange 3a, and is installed on the supporting base 1. It is supported on the parella 2 that has been made. Further, the mounting surface 3b of the workpiece 3
Is pressed against the parella 2 from above by a clamp metal fitting 4 having a bifurcated tip side called a matsuba, so that the outer peripheral flange 3a of the workpiece 3 can be detachably attached at 3 to 4 positions in the circumferential direction. Holds up.

Then, in the holding state described above, the tool 7 mounted on the spindle 6 of the machine tool is used to drill a hole such as an axial bearing hole 8 along the axial direction in a portion closer to the center than the outer peripheral flange 3a of the workpiece 3. After processing, the clamp metal fitting 4 is removed and the workpiece 3 is removed.

[Problems to be Solved by the Invention] In the conventional work holding device configured as described above, the outer peripheral flange 3a of the work 3 has a support surface 3c for performing a hole or the like on the surface opposite to the mounting surface 3b. Need to be cut by additional machining in parallel with the mounting surface 3b. Therefore, the workpiece 3 is the shaft head case, and the shaft bearing hole 8 to be machined in the shaft head case,
When processing a hole that requires high precision in position and direction, it is necessary to process the support surface 3c, which is a reference surface for processing, with high accuracy, which is troublesome. Further, when the outer peripheral flange 3a of the work 3 is pressed against the parella 2 by the clamp metal fitting 4, the work 3 has a relatively low rigidity such as a shaft head case, as shown by a chain line in FIG. ,
There is a problem that the workpiece 3 is distorted, and it is difficult to process the shaft bearing hole 8 and the like with high precision due to the distortion.

This invention is intended to solve the above-mentioned problems, and by utilizing the mounting surface and the tightening hole which are already machined on the outer peripheral flange of the workpiece, it is possible to process the outer peripheral flange on the supporting surface. In addition, the number of man-hours can be reduced, and the work piece can be held on the support base of the machine tool with good workability, and even if the work piece has low rigidity, the work piece can be supported on the support base without distortion. It is an object of the present invention to provide a workpiece holding device that can be held on a workpiece and can perform machining such as hole drilling with high accuracy even by an unskilled person.

[Means for Solving the Problem] A work holding device of the present invention is provided with a hanging portion projecting toward the center side of a support base of a machine tool at an upper end portion of a clamp table, and a workpiece is provided on a lower surface of the hanging portion. Support the mounting surface that has already been machined on the outer peripheral flange, pass through the flange on the outer peripheral flange, and pass the clamp bolts through the several fastening holes that are already formed in the circumferential direction. The work piece can be attached / detached with several clamp bases by tightening the screw holes provided in the suspension part of the clamp base and removably fixing the lower end part of the clamp base on the support base. It was hung.

[Operation] In the work holding device according to the present invention, the outer peripheral flange of the work such as the shaft head is supported on the lower surface of the holding portion of the clamp base with the mounting surface that has been finished with high precision as the reference surface, and By performing the work of passing the clamp bolt through the fastening hole that has already been formed through the flange to the clamp portion and tightening the suspension portion outside the machine tool, several clamp stands, that is, three to four clamp stands and a workpiece. Can be fastened to the outer peripheral flange with good workability. Then, the lower end of the clamp table is clamped and fixed on the support table of the machine tool with a fastening bolt or the like, and the workpiece is hung on the support table by the clamp table. In this state, the workpiece is machined with a shaft bearing hole along its axial direction, and after this machining is completed, the clamp table is removed from the support table, and the workpiece is removed together with these clamp tables. Therefore, the work surface can be mounted on the support base by using the mounting surface and the tightening holes that have already been machined on the work piece. It is possible to reduce the number of man-hours without additional machining of the supporting surface, and to easily carry out the setup for holding the workpiece on the supporting base in a short time. Furthermore, since the outer peripheral flange of the workpiece is hung on the lower surface of the suspending portion where the outer peripheral flange projects toward the center of the support base of the clamp table, and the outer peripheral flange is not pressed from above, the workpiece has a rigidity such as a shaft head case. Even a low object can hold the work piece on the support without causing any distortion in it.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, the same reference numerals as in FIG. 4 are used to tighten corresponding portions, 9 is a clamp base, and the clamp base 9 is
It is divided into an attachment 10 that is detachably supported and fixed on a support base 1 of a machine tool, and a clamp base body 11 that is detachably fixed on the attachment 10. The attachment 10 has legs 10 bent at the lower end to the outer periphery of the support 1.
The leg 10a is formed with a long hole 10b which is long in the left-right direction of the support base 1 in FIG. Also, Attachment 10
The guide ridge 10c has an inverted trapezoidal cross section in the left-right direction at the upper end of the
Are formed. A guide groove 11a is formed at the lower end of the clamp base body 11 and is held by the guide protrusion 10c so as to be slidable in the left-right direction and detachably engaged. Then, as shown in FIG. 2, a tightening mechanism 1 for tightening and fixing the clamp base body 11 to the guide protrusion 10c at a proper position by rotating the knob 12a.
2 is incorporated in the lower end of the clamp base body 11. A suspension portion 11b protruding toward the center of the support base 1 is provided at the upper end portion of the clamp base 11, and a screw hole 11c is formed at the tip of the suspension portion 11b. In addition, in FIG. 1, 13 is a tightening bolt, and 14
Is a clamp bolt. Further, in the workpiece 3 formed of the shaft head case of the machine tool, the mounting surface 3b to be mounted on the shaft head body (not shown) is already finished with high precision on the outer peripheral flange 3a, and the outer peripheral flange 3a is axially machined with this. A tightening hole 3d is formed therethrough, and the tightening hole 3d is formed at each corner of the outer peripheral flange 3a having a substantially rectangular shape in plan view. Further, between the outer peripheral flange 3a of the workpiece 3 and the central portion 3e having a long axial length (thickness), a thin connecting portion is formed.
3f is formed.

The workpiece holding device of this implementation order including the above-mentioned parts is provided in advance on the guide protrusion 10e of the attachment 10 on the clamp base body 11
By engaging the guide groove 11a of, by tightening the guide groove 11a portion to the guide protrusion 10c by the tightening mechanism 12,
The clamp base 9 is assembled. The assembled clamp base 9 is turned upside down, and on the side surface of the attachment 10 of the hanging portion 11b provided on the clamp base body 11, the shaft which has already been finished with high precision on the outer peripheral flange 3a of the turned upside-down workpiece 3 is provided. The mounting surface 3b to the head body (not shown) is supported. Then, the clamp bolt 14 is passed through the tightening hole 3d already formed in the outer peripheral flange 3a, and the clamp bolt 14 is tightened in the screw hole 11c provided in the suspending portion 11b, whereby the side surface of the attachment 10b of the suspending portion 11b. The mounting surface of the outer peripheral flange 3a is brought into close contact with and fixed. The above-described work is performed at each corner of the outer peripheral flange 3a, and the outer peripheral flange 3a is tightened by the four clamp bases 9 and the four clamp bolts 14, respectively. The fixing of the outer peripheral flange 3a of the work 3 and the suspension 11b of the clamp base 9 described above is performed outside the machine tool. Next, the workpiece 3 and the clamp base 9 are inverted to the upright state shown in FIG.
The workpiece 3 is clamped and fixed on the support base 1 of the machine tool through the elongated holes 10b provided in the leg 10a of the machine, and the workpiece 3 is fixed on the support base 1 below the hanging portion 11b of the clamp base 9. Suspend the workpiece 3 at the position.

In this state, the shaft bearing hole 8 along the axial direction is bored in the central portion 3e of the workpiece 3 by the tool of the machine tool. After the processing is completed, pull out the tightening bolts 13 to support 1
The clamp table 9 is removed from the machine, the work piece 3 is carried out from the support table 1 to the outside of the machine tool, and the work piece 3 is removed from the machine.
Remove the clamp base 9 from.

Further, in this embodiment, the clamp base 9 is divided into the attachment 10 and the clamp base body 11, so that by exchanging one of these and attaching it to the other, various workpieces of different sizes and shapes can be mounted on the support base. Can be hung on.

However, when processing a large amount of one type of workpiece,
As shown, an integral clamp base 9 is used. Third
In the figure, the same reference numerals as those in FIG. 1 indicate corresponding parts. In the work holding device according to this embodiment, a long hole 10b is formed in a leg 10a provided on a lower end surface of an integral clamp base 9, and an upper end portion is formed. A screw hole 11c is formed at the tip of a suspension portion 11b provided at the center of the support base 1 and protruding toward the center of the support base 1. The clamp base 9 of the embodiment shown in FIG. 3 is used in substantially the same manner as that of the embodiment shown in FIGS.

In addition to the shaft head case, the present invention can be widely applied to the case where the mounting surface and the tightening hole are already formed on the outer peripheral flange and the work such as the hole machining is performed on the work having relatively low rigidity. .

Further, according to this invention, there is a case where a clamp base can be tightened and fixed to the mounting surface while the workpiece is supported while the mounting surface of the workpiece is being processed. In this case, the workpiece and the clamp base are fixed. Without holding it upside down, the holding part of the clamp base can be clamped and fixed to the mounting surface of the work piece by the clamp bolt, and then the clamp base can be clamped and fixed on the support base of the machine tool to machine the work piece. it can.

[Advantages of the Invention] As described above, the work holding device of the present invention is provided with the hanging portion projecting toward the center of the machine tool supporting base at the upper end of the clamp base, and the workpiece is provided on the lower surface of the hanging portion. The mounting flange that has already been machined is supported by the outer peripheral flange of, and the clamp bolts are respectively passed through the several peripheral holes that are formed through the outer peripheral flange in the circumferential direction, and the same number of these bolts are used. The work piece can be attached / detached with several clamp bases by tightening the screw holes provided in the suspension part of the clamp base and removably fixing the lower end part of the clamp base on the support base. Since it is fixed to, the following effects can be obtained.

That is, according to the present invention, the outer peripheral flange of a workpiece such as a shaft head is supported on the lower surface of the holding portion of the clamp base with the mounting surface that has already been processed with high precision as the reference surface, and the outer peripheral flange supports this. By performing the work of passing the clamp bolt through the tightening hole that has already been formed through it and tightening it to the above-mentioned hanging portion outside the machine tool, several clamp bases, that is, 3 to 4 clamp bases and the outer peripheral flange of the workpiece are formed. Can be fastened with good workability. Then, the lower end of the clamp table is clamped and fixed on the support table of the machine tool with a fastening bolt or the like, and the workpiece is hung on the support table by the clamp table. In this state, the workpiece is machined with a shaft bearing hole along its axial direction, and after this machining is completed, the clamp table is removed from the support table, and the workpiece is removed together with these clamp tables. Therefore, the work surface can be mounted on the support base by using the mounting surface and the tightening holes that have already been machined on the work piece. It is possible to reduce the number of man-hours without additional machining of the supporting surface, and to easily carry out the setup for holding the workpiece on the supporting base in a short time. Furthermore, since the outer peripheral flange of the workpiece is hung on the lower surface of the suspending portion where the outer peripheral flange projects toward the center of the support base of the clamp table, and the outer peripheral flange is not pressed from above, the workpiece has a rigidity such as a shaft head case. Even if it is low, there is an effect that the workpiece can be held on the support table without causing any distortion in it, and that even a person who is not an expert can perform machining such as drilling with high accuracy.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing a work holding device according to an embodiment of the present invention, FIG. 2 is a side view of the clamp base, and FIG. 3 is a work according to another embodiment of the present invention. FIG. 4 is a partially sectional front view showing a holding device, and FIG. 4 is a partially sectional front view showing a conventional workpiece holding device. 1 ... Support stand, 3 ... Workpiece, 3a ... Outer peripheral flange, 3b
…… Mounting surface, 3d …… Tightening hole, 8 …… Shaft bearing hole, 9
…… Clamp base, 10 …… Attachment, 10a …… Legs, 1
0b …… Oval hole, 10c …… Guide ridge, 11 …… Clamp base body, 11a …… Guide groove, 11b …… Holding part, 11c …… Screw hole, 12 …… Tightening mechanism, 13 …… Tightening Attached bolt, 14 …… Clamp bolt.

Claims (1)

[Scope of utility model registration request] 1. A suspending portion projecting toward the center of the supporting stand is provided at an upper end portion of a clamp table, the lower end portion of which is detachably tightened and fixed on a supporting stand of a machine tool, and a lower surface of the suspending portion is provided. Support the mounting surface that has already been processed on the outer peripheral flange of the workpiece,
Clamp bolts are respectively passed through tightening holes in the circumferential direction, which are already formed through the outer peripheral flange, at several positions in the circumferential direction, and these bolts are respectively inserted into the screw holes provided in the hanging portions of the clamp base of the same number. A work holding device, characterized in that the work is clamped, the clamp base is clamped and fixed on the support base, and the work is removably suspended by several clamp bases.