JP2585439Y2 - Chuck - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chuck for gripping a workpiece in a machine tool such as a lathe.

[0002]

2. Description of the Related Art A conventional chuck has been proposed by the present applicant as Japanese Utility Model Application No. 3-51035, in which a dustproof device comprising a lid plate and a dustproof plate is provided at the front of the chuck. The action prevents the cutting fluid gripped by the chuck and flowing out to the workpiece being processed from entering the chuck body, and the rust of the sliding members (drive sleeve, master jaw, etc.) inside the chuck by the cutting fluid, We try to prevent corrosion.

[0003]

In the above-mentioned conventional chuck, it is possible to considerably prevent the cutting fluid from penetrating into the chuck body. However, although it is not perfect, it is possible to slightly cut the cutting liquid into the chuck body. There is a problem of infiltration of the liquid, and the formation of rust is inevitable. If such rust is generated on the sliding member inside the chuck, smooth sliding cannot be performed, which adversely affects chucking. In particular, the parts where high surface pressure is generated, such as the inclined groove of the wedge plunger and the inclined hook of the jaw, are apt to be worn by nature because of the high surface pressure. There is a problem that the process proceeds quickly and the component life of the chuck is shortened.

[0004]

According to the present invention , a wedge plunger is provided in a chuck body to solve the above-mentioned problems.
Provided to move back and forth in the axial direction, and tilt the wedge plunger.
A master provided on the chuck body in the inclined groove so that it can move in the radial direction
A jaw slidably engaged with a jaw inclined hook.
The master jaw and the wedge plunger.
Is characterized by being subjected to a nitrocarburizing treatment on the entire surface .

[0005]

[Function] Master jaw and wedge plunger of chuck
Has a soft nitriding treatment with excellent corrosion and wear resistance.
There is corrosion of the wedge engaging part of both due to penetration of cutting fluid etc.
And prevent wear due to high surface pressure.
This prevents seizure, prolongs the life of the parts, and facilitates the chucking operation.

[0006]

In FIG. 1, a plurality of radial master jaw guide grooves 3 are provided in a chuck body 2 of a wedge chuck 1, and a master jaw 4 shown as a sliding member is provided in the master jaw guide grooves 3 in a radial direction. Is slidably fitted in On the front end surface of the master jaw 4, a top jaw 8 having a gripping surface 7 with a bolt 5 and a jaw nut 6.
Are attached integrally. A slanted hook 4 a having a T-shaped cross section is formed at the radially inner end of the master jaw 4. The slanted hook 4 a is a sliding member of a drive sleeve 11 slidably fitted around the center of the chuck body 2. Wedge slidably engages with an inclined groove 12a formed in the wedge plunger 12 shown as "." The drive sleeve 11 is moved back and forth in the axial direction by a predetermined stroke by the action of a rotating cylinder (not shown), and the master jaw 4 slides in the radial direction of the predetermined stroke in accordance with this back and forth movement. The master jaw 4 and the wedge plunger 12 are subjected to a nitrocarburizing treatment (tufftriding treatment) (thickness: 3 to 5 μm) over the entire surface. The structure produced by the tuftride treatment is not an unstable martensite structure due to carburizing quenching or induction quenching but a stable metallic structure of epsilon-FeN, and thus has excellent corrosion resistance and wear resistance. Accordingly, the master jaw 4, the wedge plunger 12, and the cutting fluid that enter the chuck body 2 while the workpiece held by the chuck 1 is being machined.
Is prevented from being corroded, and the wedge engaging portion between the inclined hook 4a of the master jaw 4 and the inclined groove 12a of the wedge plunger 12, which has a high surface pressure and makes it difficult for grease to rotate, is prevented from wearing and seizing. .

[0007]

[Effect of the invention] As described above, in the present invention, the chuck body is used.
The wedge plunger so that it can move back and forth in the axial direction.
To the chuck body in the inclined groove of the wedge plunger.
Sliding the inclined hook of the master jaw provided to be movable in any direction
In a chuck which is freely wedge-engaged,
Nitrogen treatment is applied to the entire surface of the
The wedge engaging part between the wedge plunger and the master jaw is prevented from rusting and corroding due to the moisture of the cutting fluid or the moisture in the air that has penetrated into the chuck body. In addition, there is an advantage that the surface treatment can be easily performed as compared with the case where the surface treatment is partially performed. In addition, the wedge engaging portion due to high surface pressure
Wear can be prevented, and the life of the chuck can be extended.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention .

[Explanation of symbols]

1 chuck, 4 base jaws, 12 wedges
Plunger

Claims (1)

(57) [Scope of request for utility model registration] 1. A wedge plunger is provided in a chuck body.
Provided to move back and forth in the axial direction, and tilt the wedge plunger.
A master provided on the chuck body in the inclined groove so that it can move in the radial direction
A jaw slidably engaged with a jaw inclined hook.
The master jaw and the wedge plunger.
Chuck made by performing nitrocarburizing treatment on the entire surface of the chuck.