JPH0410964Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fixing jig for machining a soft jaw of a lathe, which is used when machining a soft jaw for gripping a workpiece on a lathe.

[Conventional technology]

Normally, the jaws of the chuck that grips the workpiece on a lathe are made of hardened chrome steel, but the jaws of the chuck used to grip the already finished surface of the workpiece without damaging it are made of hardened chrome steel. nail,
That is, the green jaws are made of steel that is not hardened, and are cut to match the dimensions and shape of the workpiece.

In cutting the raw nails, the raw nails are fixed to a master jaw (claw holder) that advances and retreats along the radial grooves provided in the scroll chuck, and this is cut with a cutting tool. Since it has a structure that meshes with the scroll, there is usually some play. Therefore, the raw jaws that are fixed to the jaw holder are also attached to the chuck with some play, and there is a drawback that high-precision cutting that matches the size and shape of the workpiece cannot be expected.

As a solution to these shortcomings, Jitsukaisho
Publication No. 50-44986 and Publication No. 51-23184 disclose that a plurality of threaded rods, which press the free jaws fixed to the chuck from the inside, are screwed together in the centripetal direction at equal intervals to the fixing jig body. By screwing the threaded rod into or into the fixing jig main body and bringing the top surface of the rod into contact with the raw nail, the force of moving the nail holder radially outward due to centrifugal force during cutting can be prevented. However, jigs have been proposed that attempt to perform accurate cutting without errors.

[Problem that the invention attempts to solve]

However, both of the above-mentioned Utility Model Application No. 50-44986 Publication and Utility Model Application Publication No. 51-23184 have a configuration in which adjustments are made by screwing or screwing a threaded rod into the fixing jig body. Problems include the need for a work process in which each threaded rod is rotated, which is inefficient, and the length of each threaded rod protruding from the fixing jig body by rotation is determined by the operator's intuition, making it difficult to center the rod. There is a point.

[Means for solving problems]

The purpose of this invention is to provide a device that solves the conventional problems as described above, and its gist is that the main body of the fixing jig is equipped with a plurality of arm rods that press the natural nails fixed to the chuck from the inside. radially attached via a compression spring so as not to be able to escape, and the arm rod is configured to be elastically movable forward and backward with respect to the fixture main body. It is in.

[Effect]

The arm rod, which is biased outward by a compression spring, is compressed toward the fixing jig body by pushing the tip attached to the tip of the arm rod, and is brought into contact with the raw jaws, and then released. It is elastically pressed and supported from the inside by the rod, and is fixed parallel to the center line.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the embodiments shown in the drawings. In Fig. 1, reference numeral 1 denotes a metal fixing jig main body, which is composed of a triangular block body, and each side has a central part. The arm rod 2 is urged outward and protrudes radially.

Reference numeral 3 denotes a vertical hole formed on each side of the fixing jig main body 1, which extends in the direction of the center 0, and the base of the arm rod 2 is connected to the enlarged base 2a of the vertical hole in the room 3a covered with the cover 4. It is attached to each side of the fixing jig main body 1 via compression springs 5 interposed between it and the bottom of the arm rod 2, and the threaded portion at the tip of the arm rod 2 is provided with a screw so that it can easily come into close contact with the raw nail to be machined. Round tip 6
are screwed together. Note that 7 in the drawing is a hole drilled in the center of the fixing jig main body 1.

The fixing jig of the present invention configured as described above is the third
As shown in the figure, insert a round rod M into the hole 7 of the fixture body 1.
A raw nail B supported through and fixed to chuck A,
Put it in the middle of B.

Since each arm rod 2 is urged outward by a compression spring 5, by pushing and retracting the tip 6 attached to the tip, bringing it into contact with the raw jaw B, and then releasing it, each raw jaw B can be opened from the inside. It is elastically pressed and supported.

Next, after setting the proposed fixing jig in the above state, remove the round bar M, rotate the chuck A according to the usual method, cut the unnecessary part B' of the raw jaw B with the cutting tool H, and shape the workpiece. (Process it into a shape that matches the outer diameter). Although a spring has been described above as a means for advancing and retracting the arm lever, it is of course possible to operate the arm lever using hydraulic pressure.

[Effect of idea]

As described above, the fixing jig for lathe machining of loose jaws according to the present invention has a plurality of arm rods that press the loose jaws fixed to the chuck from the inside in a radial manner so that they cannot escape via compression springs. Since the arm rod is configured to be elastically movable in and out of the fixing jig main body, it is easy to attach and detach, and centering work is not required. There are various effects such as further improving work efficiency.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of a fixing jig for machining a soft jaw of a lathe according to the present invention, and FIG. 2 is a side view of the fixture in use. 1...Fixing jig body, 2...Arm rod, 2a...Enlarged base, 3...Vertical hole, 3a...Room, 4...Cover, 5...Compression spring, 6...Tip, 7... center hole.

Claims (1)

[Scope of utility model registration request] A plurality of arm rods that press the free nails fixed to the chuck from the inside are attached to the fixing jig body in a radial manner via compression springs so that they cannot escape, and the arm rods can elastically move forward and backward with respect to the fixing jig body. A fixing jig for machining a soft jaw on a lathe, characterized in that it is configured so that the following is achieved.