JPH1086005A - Chuck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a work in working a plunger sliding hole in an outer body by constituting a body main body of the outer body and an inner body having a post formed therein. SOLUTION: A body main body 2 is formed of an inner body 11 which has a post 10 divided axially in a point slightly toward a front wall than the front wall side end of a sliding face 5a of a plunger sliding hole 5 and an outer body 12 with which the inner body 11 is integrally fixed. The sliding face 5a of the plunger sliding hole 5 in the outer body 12 is polished before assembling. There is no luggage inside the radial direction of the sliding face 5a across the whole range in the axial direction of the sliding face 5a to be worked so that a polishing work is facilitated and the sliding face 5a can be worked highly precisely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chuck provided with a post in a body, and more particularly, to a chuck in which a body is divided into an outer body and an inner body.

[0002]

2. Description of the Related Art A conventional chuck will be described with reference to FIGS. A plunger sliding hole 5 extending in the axial direction and a jaw guide groove 8 extending in the radial direction are formed at positions equally dividing the circumferential direction in the body main body 2 of the chuck 1. The master jaw 4 is slidably mounted in the jaw guide groove 8. A wedge plunger 6 for driving the master jaw 4 is slidably fitted in the plunger sliding hole 5. A plurality of posts (body supporting members) 10 are provided radially inward of the plunger sliding hole 5 from the inner surface 19 of the front wall of the body 2 toward the back plate 7 on the rear side of the body 2 as shown in FIG. The post 10 abuts on the back plate 7, and the back plate 7 is attached to the body body 2 by the back plate attachment bolts 25 and 32, thereby forming the chuck 1. Such a configuration is employed particularly for a chuck in which the plunger sliding hole 5 is larger than the outer diameter of the body main body 2 to improve the rigidity of the body main body 2 and reduce the displacement of the chuck end face 57.

[0003]

In the conventional chuck described above, the rigidity of the body is improved in order to prevent the jaw from lifting due to the deformation of the chuck body when grasping the work inside the plunger sliding hole and to reduce the displacement of the chuck end face. However, since the post is formed integrally with the body body, the plunger sliding hole must be machined in a small gap between the plunger sliding hole and the post. In addition, there is a problem that the work of polishing the sliding hole is very troublesome, the workability is poor, the processing accuracy is reduced, and the friction coefficient of the sliding surface is increased. Therefore, the transmission efficiency of the force (chuck efficiency). There was a problem of a decrease in the grasping power and the grasping power.

[0004]

In order to solve the above-mentioned problems, in the present invention, the body is moved in the axial direction at a position closer to the front wall than the front wall side end of the sliding surface of the plunger sliding hole. It is composed of an internal body having a post axially rearward from the split position and an external body to which the internal body is integrally fixed, and firstly, a working of a sliding surface of a plunger sliding hole provided in the external body. After that, the inner body is integrally fixed to the outer body to form a body body. This facilitates machining of the plunger sliding hole, and improves machining accuracy.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, a master jaw is slidably mounted in a jaw guide groove provided in a body body in a radial direction, and a wedge plunger for driving the master jaw is provided in a plunger sliding hole of the body body. Slidably in the axial direction of the chuck, extending from the inner wall of the front wall of the body to the back plate attached to the rear of the body, from the inner surface of the plunger sliding hole in the body, and integrated with the back plate. In the chuck provided with the post to be fixed, the body body is axially divided at a position closer to the front wall than the front wall side end of the sliding surface of the plunger sliding hole, and a post axially rearward from the division position. And an external body to which the internal body is integrally fixed. As a result, when the sliding surface of the plunger sliding hole is processed, the post can be easily performed without disturbing the post, so that the processing can be performed with high precision, and the chucking efficiency and gripping power can be improved.

Also, since the fitting projection of the post is fitted to the inner surface of the front wall to which the post is fixed, and the fitting recess for positioning the post in the radial direction is provided, the inner body and the outer body are separated. Even if they are separate bodies, the inner body does not rattle in the radial direction while rotating with respect to the outer body in the combined state, and the chuck can be smoothly rotated.

[0007]

Next, an embodiment of the chuck of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. As shown in FIG. 1, the chuck 1 moves back and forth between a body body 2, a master jaw 4 having a top jaw 3 slidably mounted in the body body 2 in a radial direction, and a plunger sliding hole 5 of the body body 2. It comprises a wedge plunger 6 that is slidable in the direction and drives the master jaw 4 and a back plate 7 that is attached to the rear side of the body 2. As shown in FIG. 4, the body main body 2 has a front wall side end A of the sliding surface 5a of the plunger sliding hole 5.
An inner body 11 having a post 10 divided in the axial direction at a position B slightly closer to the front wall 12a, and an outer body 12 to which the inner body 11 is integrally fixed.

The external body 12 is provided with a plunger sliding hole 5 extending in the axial direction as shown in FIGS. 1, 4 and 5, and the wedge plunger 6 slides in the plunger sliding hole 5. It is slidably fitted to the moving surface 5a. At the position where the outer body 12 divides the circumferential direction into three equal parts,
Radially outward of the plunger slide hole 5, the guide jaw 4 includes left and right guide surfaces 13 a, 13 b, a front guide surface 9 a, and a rear guide surface 14 a, and has a radius smaller than the wedge groove 49 in the wide portion 4 A of the master jaw 4 shown in FIG. An outer jaw guide groove 16 for guiding the outer guide portion 15 on the outer side in the direction, and an outer jaw guide groove 16
Of the narrow portion 4B of the master jaw 4 in front of
And a front guide surface 9b provided inside the plunger slide hole 5 and coplanar with the front guide surface 9a. Also, a fan-shaped inner body engaging portion having a fitting concave portion 23 which engages with a front end surface 20a of the inner body 11 to be described later on the inner surface 19 of the front wall and in which a fitting convex portion 22 of the inner body 11 is fitted. As shown in FIG. 6, reference numerals 24 are formed between the outer jaw guide grooves 16 at positions dividing the circumferential direction into three equal parts.

The inner body 11 is formed integrally with a post 10. The post 10 has a fan-shaped front post 20 corresponding to the inner body engaging portion 24 as shown in FIGS.
And a rear post 21 projecting rearward. The posts 10 are provided at three positions at equal angular intervals in the circumferential direction at positions corresponding to the inner body engaging portions 24. The front post 20 is provided with a fitting projection 22 that fits into the fitting recess 23 of the inner body engaging portion 24, and the front end surface 20 a comes into contact with the end surface 30 of the inner body engaging portion 24. ing. The front end face 20a and the end face 30 in the abutted state are in a plane including the position B. The side surfaces of the front post 20 are formed on left and right guide surfaces 29a and 29b, which are the same as the left and right guide surfaces 13a and 13b, respectively.
The inner guide portion radially inward of the wedge groove 49 in the wide portion 4A of the master jaw 4 by the rear guide surface 14b, the front guide groove 9b of the outer body 12, and the left and right guide surfaces 29a, 29b, which form the same plane as that of FIG. An inner jaw guide groove 31, which guides the inner and outer jaw guide grooves 31, 16,
The guide surface 18 forms the jaw guide groove 8. As shown in FIG. 1, the inner body 11 is provided with a collar sliding hole 35 into which a dustproof collar 34 is slidably fitted, and an O-ring is fitted into the collar sliding hole 35. O-ring groove 36 is provided. The inner body 11 and the outer body 12 are integrated by a body connecting bolt 27 to form a body body 2, and a back plate 7 is provided with a back plate mounting bolt 32 on the rear side of the body body 2.
And a back plate mounting bolt 25 inserted through the post 10 of the internal body 11.

Next, the wedge plunger 6 for driving the master jaw 4 will be described. As shown in FIGS. 9 and 10, the master jaw 4 is attached to the annular wedge plunger 6.
There are formed three fitting portions 37 in the circumferential direction corresponding to the jaw guide grooves 8 provided in the body main body 2.
Each fitting portion 37 is provided with a wedge portion 39 facing each other and having a predetermined downward slope toward the front in the axial direction of the chuck. The lower side of the wedge portion 39 is an inclined groove 38 for accommodating the inner guide portion 48 of the master jaw 4. The outer peripheral surface 40 of the wedge plunger 6 is obliquely cut off from the radially outer surface of the wedge portion 39 to form a sliding contact surface 42 with which the outer inclined surface of the wedge groove 49 of the master jaw 4 slides. The wedge plunger 6 has a post 10 of the internal body 11.
Is provided through the post through hole 43. Also,
As shown in FIG. 1, a rear end of the dustproof collar 34 is screwed into a front side of a connection hole 44 to which a piston rod of a rotating cylinder (not shown) is connected. The outer peripheral surface 40 of the wedge plunger 6 is slidably in contact with the sliding surface 5a of the plunger sliding hole 5 of the body body 2 and is fitted so as to be slidable in the axial direction. Reference numeral 45 denotes a fastening hole provided in the external body 12 and the wedge plunger 6 for fastening a chuck mounting bolt 46 for mounting the chuck 1 to a main shaft of a machine tool (not shown).

As shown in FIG. 11, a wedge groove 49 is formed in the master jaw 4 between the outer guide portion 15 and the inner guide portion 48 so as to slidably engage with the wedge portion 39 of the wedge plunger 6. As shown in FIG. 3, the master jaw 4 is T-shaped. As shown in FIG. 1, a bolt 50 for preventing the master jaw 4 from protruding in the radial direction of the chuck penetrates through the center of the master jaw 4, and a jaw nut 51 shown in FIGS. The top jaw 3 for grasping the work is engaged with the serration 52 of the master jaw 4 and the serration 53 of the top jaw 3 and the jaw nut 51 is fixed to the master jaw 4.
And is attached by a bolt 54 via the. The master jaw 4 configured as described above is inserted into the jaw guide grooves 16 and 31 of the jaw guide groove 8 of the body main body 2 and the external guide portion 1 is provided.
5 and the inner guide portion 48 are slidably engaged with each other,
Are slidably guided on the guide surface 18, and the wedge groove 49 is engaged with the wedge portion 39 of the wedge plunger 6, and
8 is accommodated in the inclined groove 38 and is driven in the radial direction by the movement of the wedge plunger 6 in the axial direction to grip the work. Reference numeral 55 denotes a grease nipple for supplying lubricating oil into the chuck.

The body body 2 of the chuck 1 has an internal body 1
1 and the external body 12 are integrally assembled by a body connecting bolt 27. Before the assembly, the sliding surface 5a of the plunger sliding hole 5 of the external body 12 is polished. Since there is nothing inside the sliding surface 5a in the radial direction over the entire range of the sliding surface 5a to be processed in the axial direction, the polishing becomes easy, and the sliding surface 5a can be processed with high precision. Thereafter, the outer body 12 and the inner body 11 are integrally connected to form the body body 2, and then the jaw guide grooves 8, the back plate mounting surface 56, etc. are processed simultaneously with the outer body 12 and the inner body 11 to achieve high precision. Since the body is finished, even if the body 2 is assembled from the separate bodies 11 and 12, the accuracy of the jaw guide grooves 8 and the like does not decrease. Then, a master jaw 4, a wedge plunger 6, and a back plate 7 are attached to the body body 2,
A chuck 1 is configured. Since the thus obtained chuck is provided with the post 10, the rigidity of the body main body 2 is high even if the chuck has the large-diameter plunger sliding hole 5.
The displacement of the chuck end surface is extremely small, and the lifting of the jaw when grasping the work is reduced. In addition, since the plunger sliding hole 6 has high precision and the plunger 6 can move smoothly, the power transmission efficiency is increased. In addition, body 1
Since no force for separating the joints or a force in the shearing direction is applied to the joints 1 and 12, there is no reduction in the rigidity of the joints.

[0013]

As described above, according to the present invention, since the body main body is constituted by the outer body and the inner body having the post formed therein, the working can be easily performed when the plunger sliding hole of the outer body is machined. Since it can be performed, workability is improved, and processing can be performed with high accuracy. Further, since the processing accuracy is high, chuck efficiency and gripping power are improved.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line II of FIG. 2;

FIG. 2 is a front view of the chuck.

FIG. 3 is a view as viewed in a direction III in FIG. 2;

FIG. 4 is a sectional view of a body main body.

FIG. 5 is a sectional view taken along line VV of FIG. 6;

FIG. 6 is a front view of the external body.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 8;

FIG. 8 is a rear view of the internal body.

FIG. 9 is a sectional view taken along line IX-IX of FIG. 10;

FIG. 10 is a front view of a wedge plunger.

FIG. 11 is a side view of the master jaw.

FIG. 12 is a cross-sectional side view of a conventional body main body.

[Explanation of symbols]

 Reference Signs List 1 chuck 2 body 4 master jaw 5 plunger sliding hole 5a sliding surface 6 wedge plunger 7 back plate 8 jaw guide groove 10 post 11 internal body 12 external body 12a front wall 19 front wall inner surface 22 fitting projection 23 Mating recess

Claims (2)

[Claims] 1. A master jaw is slidably mounted in a jaw guide groove provided on a body body in a radial direction, and a wedge plunger for driving the master jaw is inserted into a plunger sliding hole of the body body in an axial direction of a chuck. A post is provided slidably, extending radially inward from the plunger sliding hole in the body, from the inner surface of the front wall of the body to the back plate attached to the back of the body, and integrally fixed to the back plate. In the chuck, the body body is divided axially at a position closer to the front wall than the front wall side end of the sliding surface of the plunger sliding hole, and an internal body having an axially rearward post from the division position and the internal body. A chuck comprising an inner body and an outer body integrally fixed thereto. 2. A fitting recess according to claim 1, wherein a fitting recess of the post is fitted on the inner surface of the front wall to which the post is fixed to position the post in the radial direction. Chuck.