JPH07290332A - Coaxial releasing device - Google Patents

Abstract

PURPOSE:To provide a device capable of simply releasing a clamp work at a low cost during machining process for releasing the stress generated in the work during the part machining by an MC machine with an ATC. CONSTITUTION:Multiple steel balls 8 are held at three points: the taper local section 11 of a draw shaft 1, the taper local section 14 of a thrust converting shaft 7 coupled with a coil spring 6, and the bottom side face 4c of a fixing guide 4. When the steel balls 8 are pressed by the force larger than the elastic power of the coil spring 6 in the axial direction from one side of the draw shaft 1, the steel balls 8 are moved in the centrifugal direction, the thrust converting shaft 7 is slid in the coaxial direction opposite to the pressing direction, and a work 10 is released by a clamp plate 2. When the pressure is released, the thrust converting shaft 7 is slid in the coaxial direction same as the pressing direction by the elastic power of the coil spring 6, and the work 10 is fastened by the clamp plate 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coaxial slackening device for slackening a clamp work in the process of machining parts of all industrial products.

[0002]

2. Description of the Related Art Conventionally, as a device for attaching and detaching a work in a part machining process in an MC machine with an ATC, a device for manually clamping with a nut or a fully automatic clamping device utilizing hydraulic pressure or pneumatic pressure is used. There are things that perform operations.

During the machining of such parts, the stress generated at that time causes distortion of the workpiece after machining, so it is necessary to release the stress by temporarily releasing the clamped state between each process.

[0004]

In the case of manual operation, however, the clamping and loosening at each interval must be manually performed on all works, which is a great burden on the operator. When using hydraulic pressure, air pressure, etc.,
Although it is not a burden to the operator because it is fully automatic, the high cost due to the need for peripheral equipment for installation, the problem of oil leaking from the hose for pressure conduction, the leakage of air, etc. remain as problems to be solved. Was there.

The present invention solves the above-mentioned problems and simplifies the loosening of clamp work performed between machining steps in order to relieve the stress generated in the work during machining of parts in an ATC-equipped MC machine or the like. Moreover, it is an object of the present invention to provide a device that can be performed at low cost.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a sliding body which is slidably inserted in a groove of a fixing guide which is screwed into one end of a tubular housing so as to be slidable in a longitudinal direction, and penetrates through the housing. The draw shaft with one end screwed into the sliding body, the tubular thrust conversion shaft that is slidably inserted into the draw shaft, the taper local part of the draw shaft and the taper local part of the thrust conversion shaft, and the bottom side surface of the fixing guide. A plurality of steel balls sandwiched at three points, a coil spring that is inserted into the thrust conversion shaft to constantly push the thrust conversion shaft toward the steel ball by elastic force, and a workpiece is fixed at one end of the thrust conversion shaft. And a clamp plate for loosening and a holding nut.

[0007]

[Operation] By the push-back motion of the draw shaft which is given a rotation, a plurality of steel balls sandwiched between the taper local part of the draw shaft, the taper local part of the thrust converting shaft and the bottom side surface of the fixing guide are attached to the draw shaft. The thrust conversion shaft slides in the direction opposite to the direction in which the draw shaft is propelled by acting on the thrust or reverse thrust generated by the pushing back motion of the draw shaft and moving in the centrifugal or central direction of the draw shaft, and the clamp plate clamps. Controls work relaxation.

On the other hand, even if the draw shaft is not rotated, if the taper local part of the draw shaft is not in contact with the bottom side surface of the fixing guide, the elastic force of the coil spring is more than the axial force from the other end of the draw shaft. When the sliding body screwed to the draw shaft slides in the same direction as the pressure, the thrust conversion shaft slides in the direction opposite to the direction in which the draw shaft propels and the pressure is released. Occasionally, the sliding body slides the thrust converting shaft in the same direction as the direction in which the elastic force of the coil spring presses the rod, thereby controlling the relaxation of the clamp work of the clamp plate.

After the work is clamped, rough machining is performed by an MC machine or the like, and when pressure is applied from the end of the draw shaft to release the stress generated in the work at that time, the clamp is temporarily released. After that, the pressure is released and the final processing is performed again in the clamped state.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus of the present invention will be described below with reference to the drawings. 1, 3 and 4 are cross-sectional views of the coaxial loosening device of the present invention. FIG. 1 shows a work clamp state, FIG. 3 shows a temporary clamp release state between machining steps, and FIG. 4 shows a work attachment / detachment state. .

The coaxial loosening device of the present invention shown in FIGS. 1, 3 and 4 is fixed to a working surface plate 13 such as an MC machine with an ATC, and a draw shaft 1 slides in a groove 4a of a fixing guide 4. Since it is screwed at one end to the slide body 5 which is fitted as much as possible, when the draw shaft 1 is rotated in the clockwise direction as shown by an arrow A in FIG.
1 approaches the bottom side surface 4c of the fixing guide 4 in the axial direction, and eventually comes into contact.

After the contact, the sliding body 5 comes closer to the inner side surface 4b of the groove 4a of the fixing guide 4 and eventually comes into contact therewith.

In this operating state, the taper local portion 14 of the thrust converting shaft 7 having an inclination angle of 45 °, the taper local portion 11 of the draw shaft 1 having an inclination angle of 45 °, and the bottom side surface 4c of the fixing guide 4 are provided. A plurality of steel balls 8 sandwiched at three points with respect to and
Since the number of transmission shafts is such that they can be transmitted to the draw shaft 1, the draw shaft 1 is gradually moved in the centrifugal direction, and the thrust converting shaft 7 is moved to the arrow B direction.
Will be pushed in the direction of.

The sliding member 5 and the groove 4a of the fixing guide 4 are provided.
Since the clamp plate 2 is loosened when it comes into contact with the inner side surface 4b of the, the position of the clamp plate 2 into which the thrust converting shaft 7 is inserted is pressed down and moved by the nut 15.
Manual adjustment to attach work piece 10.

The state of the apparatus when the work 10 is attached is shown in FIG.
As a matter of course, this state becomes the apparatus state when the work 10 is removed after the processing is completed.

Next, in order to bring the workpiece 10 into the clamped state of FIG. 1 in which it is held by both the pressing plate 12 and the clamp plate 2, the draw shaft 1 is rotated counterclockwise as indicated by arrow C. Contrary to when the work 10 is attached, the taper local portion 11 of the draw shaft 1 gradually moves away from the bottom side surface 4c of the fixing guide 4 in the axial direction.

In this state, since the elastic force of the coil spring 6 is transmitted to the thrust converting shaft 7, as the steel ball 8 gradually moves toward the center of the housing 3,
The thrust converting shaft 7 is pushed down in the direction of arrow D.

When the draw shaft 1 is further rotated, the taper local portion 11 of the draw shaft 1 retreats to a position where it is not affected by the thrust of the steel ball 8, and eventually the bottom surface 14a of the taper local portion 14 of the thrust converting shaft 7 is reached. To contact.

After the contact, the sliding member 5 is now fixed by the fixing guide 4.
Begins to stick out from. By visually observing the protrusion of the sliding body 5, it can be confirmed that the work 10 is sufficiently clamped by the clamp plate 2 into which the thrust converting shaft 7 is inserted.

After the work 10 is clamped in this way,
Although the rough machining process is started, in order to release the stress generated in the work 10 during the machining, it is necessary to temporarily release the clamp shown in FIG. 3 between the machining.

Reference numeral 9 indicates a tool shaft of an MC machine with an ATC, etc. If the ATC is installed, the tool shaft is automatically converted. If the ATC is not installed, the tool shaft for holding a cutting tool such as a cutting tool is manually converted into a tool shaft for pressing. The tool shaft 9 presses the draw shaft 1 in the direction of arrow D.

As a result, as in the case of the work attachment / detachment state shown in FIG. 4, the thrust converting shaft 7 is moved backward in the direction of arrow B against the elastic force of the spring 6 by advancing the draw shaft 1 in the direction of arrow D. As a result, the clamp plate 2 is relaxed and once released from the work 10, the accumulated stress is released.

After the stress is released, the tool shaft 9 is pulled back again in the direction of the arrow B to perform the final machining in the clamped state of FIG. 1, and after the machining is completed, the work from the workpiece attachment / detachment state of FIG. 4 is repeated.

[0024]

As described above, according to the coaxial slackening device of the present invention, it is possible to automatically loosen the clamp work for releasing stress without using hydraulic pressure, pneumatic pressure, etc. Moreover, since peripheral equipment is not required, the installation cost is less than half that in the case of hydraulic pressure or pneumatic pressure.
When equipped on an MC machine with an APC (Automatic Pallet Changer), it does not require a pressure transfer tube such as a hose, so work efficiency is expected to be further improved, and of course oil leaks, air leaks, etc. Since there is no problem and the structure is simple, it is possible to reduce the size according to the tightening torque of the clamp.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a state in which a loosening operation is started from a clamped state of a work in an embodiment of a coaxial loosening device of the present invention.

FIG. 2 is a front view showing a positional relationship between the coaxial relaxing device of the present invention and a work when the work is attached.

FIG. 3 is a side sectional view showing a temporarily released state of the clamp during the machining in the embodiment of the coaxial loosening device of the present invention.

FIG. 4 is a side sectional view showing a state when a work is attached and detached in one embodiment of the coaxial relaxing device of the present invention.

[Explanation of symbols]

 1 ... Draw shaft 2 ... Clamp plate 3 ... Housing 3a ... Inside surface of housing 4 ......... Fixing guide 4a ......... Fixing guide groove 4b ......... Fixing guide groove Inner surface 4c ……… Bottom surface of the fixing guide 5 ……… Sliding body 6 ……… Coil spring 7 ……… Thrust conversion shaft 8 ……… Steel ball 9 ……… Tool shaft 10 ……… Workpiece 11 ………… Drawer taper local area 12 ………… Pressing plate 13 ………… Processing surface plate 14 ………… Thrust force converting shaft taper local area 14a ……… Thrust force converting shaft taper local area 15 ……… Pressing Nut 16 ………… Nut for preventing sliding body from falling 17 ………… Collar for workpiece support 17b ………… Spacer for workpiece support

Claims (1)

[Claims] 1. A sliding body (5) which is slidably fitted in a groove (4a) of a fixing guide (4) screwed to one end of a tubular housing (3) in a longitudinal direction, and a housing. (3) A draw shaft (1) that penetrates through the slide body (5) and has one end screwed into it, a tubular thrust conversion shaft (7) formed by slidably inserting the draw shaft (1), and a draw shaft. The taper local part (11) of the shaft (1) and the taper local part (1 of the thrust conversion shaft (7)
4) and a plurality of steel balls (8) sandwiched by three points on the bottom side surface (4c) of the fixing guide (4) and the thrust converting shaft (7) by the elastic force always in the steel ball (8) direction. A coil spring (6) fitted into the thrust converting shaft (7) to push the thrust converting shaft (7), and a clamp plate (2) for holding and loosening the work (10) and a holding nut (1) at one end of the thrust converting shaft (7). 1
5) A coaxial relaxing device consisting of