JPS5852036Y2 - Placement of workpiece with clamp - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for clamping a workpiece to a reference surface during processing of the workpiece.

In a conventional workpiece clamping device, as shown in Fig. 1, a boss 1 is provided protruding in a direction perpendicular to a reference surface 4 against which a workpiece W comes into pressure contact, and the axis of the boss is moved forward and backward by an actuating device such as a cylinder. A moving drawbar 2 was projected longitudinally, and a stopper 3 for engaging a contact plate 5 was attached to the projecting end.

This conventional device inserts a workpiece W into a boss 1 as shown in FIG. 1A, and inserts the workpiece W into a reference surface 4 as shown in FIG.
By fitting the contact plate 5 into the tip of the drawbar 2 and moving the drawbar 2 backward, the stopper 3 presses the contact plate 5 against the workpiece W as shown in FIG. 1C. is suppressed and clamped to the reference surface 4.

Such a device requires the work of inserting the contact plate 5 when clamping the workpiece, and the work of removing the contact plate 5 when removing the workpiece after unclamping, which not only results in poor workability, but also There was a problem in that the drawbar was operated without forgetting to insert the backing plate 5, resulting in defective machining.

The present invention solves the above-mentioned problems of the conventional device, and its feature is that a member corresponding to the abutment plate 5 of the conventional device is provided integrally with the drawbar, and is automatically moved in the radial direction by advancing and retracting the drawbar. This is an improvement.

An embodiment of the present invention will be explained with reference to FIG. 2 and FIG. 5.

A boss 1 is attached to the tip surface of the boss 1, which protrudes perpendicularly to the reference surface (corresponding to the reference surface 4 in FIG. 1) on which the workpiece W comes into pressure contact.
Two tapered surfaces 11a, 11 that are inclined toward the axis of
The slide base 11 having b is fixedly installed.

Further, a bushing plate 6 is attached to the tip of a drawbar 2 which extends vertically through the center of the boss 1 and the slide base 11 and is moved forward and backward by an actuating device so as to be adjustable in position with a nut 12.

Guide grooves 6a are provided on both sides of the bushing plate 6 in a radial direction perpendicular to the axis of the drawbar 2, and a pair of pressing members 7a and 7 made of semicircular blocks are provided in the guide grooves 6a.
b is the sliding groove 10a, 1 provided in the pressing members 7a, 7b.
0b so as to be slidably guided and supported in the radial direction.

This pair of suppressing members 7a. 7b includes tapered surfaces 8a and 8b that contact the tapered surfaces 11a and 11b of the slide base 11, respectively, and a semicircular workpiece pressing surface 13a that is continuous with the tapered surfaces 8a and 8b and perpendicular to the axis of the drawbar 2. , 13b are formed.

Further, the pair of pressing members 7a and 7b are always drawn toward each other in the axial direction by the spring 9, and when the drawbar 2 is at its forward moving end, it is retracted to the same position as the outer periphery of the bushing plate or on the inner diameter side thereof. ing.

Next, the operation of the above structure will be explained with reference to FIGS. 4 and 5.

The state shown in FIG. 4 is an unclamped state.

That is, the drawbar 2 is at the forward movement end, and the pressing members 7a and 7b are on the tapered surface 11a of the slide base 11,
1 lb., and the bushing plate 6
It is located at the same diameter as the outer circumference of.

In this state, the workpiece W can be inserted into the boss 1 before machining, and can be freely removed after machining.

When the workpiece W is inserted into the boss 1 and the drawbar 2 is moved backward with the workpiece W in contact with the reference surface 4, the bushing plate 6 moves toward the tip of the boss 1 as shown in FIG.

As a result, the pressing members 7a and 7b are also pressed against the bushing plate 6.
The pressing members 7a, 7b slide in the outer radial direction against the tensile force of the spring 9 as the tapered surfaces 8a, 8b rise along the tapered surfaces 11a, Ilb of the slide base 11. and protrudes from the outer peripheral surface of the bushing plate 6.

Therefore, the semicircular workpiece pressing surfaces 13a, 13b formed on the pressing members 7a, 7b abut against the workpiece W, and firmly clamp the workpiece W against the reference surface 4.

Note that the position of the bushing plate 6 is adjusted by the nut 12 at the tip of the drawbar 2, and the pressing members 7a, 7b and the workpiece W are adjusted.
The position of contact with is set arbitrarily.

According to the device of the present invention, the pair of suppressing members expand and contract in the radial direction by the bush plate and the tapered surface of the slide base as the drawbar advances and retreats.
Since the workpiece is clamped by being pressed against the reference surface by the semicircular workpiece suppressing surface, a large surface pressure is obtained against the workpiece, which has the effect of ensuring a firm and ramped state.

[Brief explanation of the drawing]

Figures 1A, B, and C are cross-sectional views showing the structure and operation of the longitudinal device, Figure 2 is a perspective view of the main parts of the device of the present invention, Figure 3 is an exploded perspective view of the various parts, and Figure 4 is Cross-sectional view of unclamped state,
FIG. 5 is a sectional view of the clamped state. 1...Boss, 2...Drawbar-4...Reference surface, 6
...butsuspray), 7a, 7b...pressing member,
8a. 8b...Tapered surface, 9...Spring, 11...
Slide base, 11a, Ilb... Tapered surface.

Claims (1)

[Scope of utility model registration request] A slide base having two tapered surfaces inclined toward the axis of the boss is fixed to the tip end surface of a boss that protrudes perpendicularly to the reference surface on which the workpiece comes into pressure contact, and the boss and the slide base A bushing plate is provided at the tip of the drawbar that protrudes vertically through the center and is moved forward and backward by an actuator.
Guide grooves are formed on both sides of the bushing plate in a radial direction perpendicular to the axis of the drawbar, and a pair of suppressing members made of semicircular blocks are slidably guided and supported in the guide grooves. is formed with a tapered surface that comes into contact with the tapered surface of the slide base, and a semicircular workpiece suppressing surface that is connected to the tapered surface and perpendicular to the axis of the drawbar, and both pressing members are always held in the locking direction by a spring. A device for clamping workpieces by pulling them together.