JPS604664Y2 - Workpiece mounting jig - Google Patents

Description

[Detailed explanation of the idea] When performing surface machining of a workpiece, the dimensions from the workpiece's machining reference surface to the actual machining surface, and the dimension from the reference member installed on the workpiece mounting jig to the cutter. The jig and other dimensions are set so that both are set to the same dimensions.

The reference member is usually designed to receive a clamping force from a clamper attached to the jig.

However, due to the shape of the workpiece, the relationship with the actual machining location, or other reasons, there are cases where the clamping point cannot be moved significantly from the installation position of the reference member, and in this case,
A backup member that receives only the clamping force separately from the reference member is installed close to the clamping point.

The dimensions between the support surface of the workpiece that the backup member contacts and the processing reference surface that the reference member contacts are as follows:
Since there are constant variations due to manufacturing errors, etc., the backup member is required to be movable in the vertical (or horizontal) direction in order to absorb the variation, unlike a fixed reference member.

Therefore, in this type of jig, both the clamping actuation mechanism and the backup actuation mechanism must be incorporated into the limited space near the clamping point, which requires a complex and cumbersome jig design. In addition to being difficult to manufacture and assemble, there are also problems such as difficult manufacturing and assembly operations.

The present invention aims to provide a simplified jig in order to eliminate these conventional problems, and will be described below based on the embodiments shown in the accompanying drawings.

In the figure, the workpiece indicated by the symbol W has a top surface that is subjected to milling or the like using a cutter (not shown), and an intermediate surface that is a reference surface that serves as a reference for the processing.

These processed surfaces and reference surfaces are designated by symbols T and B, respectively.

A reference pad 2 that supports the workpiece W by contacting the processing reference surface B is integrally attached to the jig main body 1 via a stud 3.

Further, on the side of the jig main body 1, a cylinder 5 whose lower surface is elastically repelled by a carding spring 4 is attached to a clamp sleeve 6.
It is built in so that it can be moved as a guide.

Two passages a and b are bored in this cylinder 5.
, one end thereof communicates with oil passages A and B, respectively, which communicate with a hydraulic power source (not shown) via a switching valve, and the other end communicates with the cylinder 5.
It opens into chambers Ra and Rb, respectively, partitioned by a piston 7 sliding therein.

A piston rod 8 is rotatably attached to the piston 7, and a helical groove 8' is carved in a part of the piston rod 8, and a clamper 9 is provided at the upper shaft end. It is fixed.

Further, an end cap 10 is fixed to the upper end of the cylinder 5, and a guide 11 that fits into the spiral groove 8' is fitted into the end cap 10, and a backup pad 12 is attached.

When pressure oil is introduced from the hydraulic power source through the oil passage C, the clamp sleeve 6 contracts on its inner circumferential surface, causing the cylinder 5 to collapse.
When the cylinder 5 is relatively firmly pressurized and the supply of pressurized oil is cut off, the cylinder 5 returns to a dimension in which it can freely slide.

Therefore, if pressure oil is not supplied to oil path C,
The backup pad 12 is resiliently supported by a carded spring 4 via a cylinder 5 so as to stop at the highest position regulated by a stopper 13.

Furthermore, when the supply of pressure oil to the oil passages A and B is switched and controlled via a switching valve (not shown), the piston 7 moves up and down as appropriate, and thereby the piston rod 8 and clamper 9 move up and down while being rotated. It turns out.

Before loading the work W, pressure oil is supplied only to the oil passage A.

Therefore, the upper end surface of the backup pad 12 stops at the highest raised position h as described above, and also the clamper 9
The upper end surface of the H
stopped in position.

At this time, the clamper 9 is out of phase by a predetermined angle from the state shown by the solid line in the figure.

It is stopped in a state where it is stopped.

The workpiece W is loaded from this state, but in this invention, when loading, the processing reference plane B
The flange portion W' of the upper outer edge of the work W comes into contact with the backup pad 12 before the reference pad 2 comes into contact with the reference pad 2.

Due to the weight of the workpiece, the backup pad 12 follows and descends together with the cylinder 5 against the repulsive force of the carding spring 4 until the reference surface B and the reference pad 2 come into contact.

When it is sensed that the workpiece W is supported by the reference pad 2, pressure oil is supplied to the oil passage C, and the cylinder 5 is tightened and held by the clamp sleeve 6, and the supply of pressure oil is switched from oil passage A to oil passage B by the switching valve. Clamper 9
descends with rotational movement and pressurizes the upper surface of the flange portion W' as shown in the figure.

This pressing force is received by the cylinder 5 which is tightly held by the clamp sleeve 6 via the backup pad 12.

When the workpiece W is clamped in this manner, the processing surface T is subjected to a predetermined processing.

As explained above, according to the present invention, a movable backup pad, which is attached separately from a fixed reference pad that supports the machining reference surface due to the machining part of the workpiece and for that reason, is installed on the clamper actuating piston. Since it is installed integrally with the cylinder, the entire device is significantly smaller and more compact.

Furthermore, as a result of forming the movable cylinder to be resiliently repelled by a carding spring and to tighten and hold the cylinder at a desired position by a clamp sleeve, the dimension By using this method, even if there is a variation, the variation can be compensated for and a ramping operation can be performed that is always effective.

[Brief explanation of the drawing]

The figure shows a partially cutaway view of a workpiece mounting jig according to the present invention. W... Workpiece, T... Machining surface, B...
... Reference surface, 1 ... Jig body, 2 ...
・・Standard pad, 4・・Combination spring, 5・
... Cylinder, 6 ... Clamp sleeve, 7 ... Zeston, 8 ... Zeston rod, 9 ... Clamper, 12 ... Backup Pad, 13...stopper.

Claims (1)

[Scope of utility model registration request] In a workpiece mounting jig, the workpiece mounting jig is equipped with a reference member that supports a machining reference surface of the workpiece, and a backup member attached in the vicinity of the clamping point separately from the reference member, the backup member being a movable cylinder that is elastically repelled by a carding spring. A clamper is attached to the other end of the piston rod, which is integrally installed and has one end pivotally connected to a piston that reciprocates within the cylinder, and a stopper that regulates the amount of movement of the cylinder, and a stopper that controls the cylinder to a predetermined position by introducing hydraulic pressure. A workpiece mounting jig characterized by installing a clamp sleeve that tightens and holds the workpiece in place.