JP3063997B2 - Table clamping device for indexing circular table - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Industrial applications]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a table clamping device for an index circle table mainly used for indexing a workpiece in a machine tool.

[0002]

[Prior art]

2. Description of the Related Art Conventionally, as one method of a table clamping device for an index circle table, a method of pressing a disk plate to couple a rotating body to a fixed body has been adopted. Conventionally, as shown in FIG. 3, a thin hollow disk-shaped plate
The plate 112 is fixed to an end face of the spindle 103 as a rotating body as a disk plate of a clamping member, and the outer peripheral end face of the plate 112 is formed on the end face of the piston 104 by a projection provided on the end face of the piston 104. It is pressed against the end face and connected to the body 106 as a fixed body and the plate 112 as a rotating body to form a table 10.
Seven clamps were made. The clamp was released by operating the piston 104 in the opposite direction to remove the piston pressing force.

[0003]

[Problems to be solved by the invention]

Such a system has the following disadvantages. (1) The clamping torque depends only on the frictional force generated between the fixed body and the plate among the frictional forces generated on both surfaces of the plate. (2) Since a double-acting cylinder is provided for releasing the clamp, the structure becomes complicated, and two pipes are required. (3) Since the cylinder area cannot be made large, the table clamping force cannot be made large. (4) The number of parts increases and the manufacturing cost increases. The present invention has been made to eliminate these disadvantages.

[0004]

[Means for Solving the Problems]

The present invention comprises a body and a table rotating body which is rotatably supported by the body, and a thin disk-shaped disk plate forming a part of the table rotating body is fixed by a piston which moves in the axial direction of the body by a pressure fluid. A clamping device for an indexing rotary table, which is pressed against a body end face portion and prevents rotation of the table rotating body, is configured as follows; A thin-walled hollow disk-shaped plate is fixed to the inner peripheral portion thereof, and the outer peripheral portion of the thin-walled hollow disk-shaped plate is also fixed to the body; A disk-shaped plate elastically deformed in the axial direction of the body; (c) the piston is thin in the axial direction of the body; Being disposed between the disc-shaped disk plate and the thin hollow disc-shaped plate, (d) when clamping the table rotating body, the thin disc-shaped disc plate is brought into contact with the piston by axial movement of the piston due to the pressure fluid of the piston. And a piston that is pressed against the body end surface in a sandwich state, and when the clamp is released, the piston is returned by spring force due to elastic deformation of the thin hollow disk-shaped plate.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION

Due to the air pressure (or hydraulic pressure) acting on the piston 4, the piston 4 causes the plate 5 to bend (against the spring force of the plate 5) while distorting the plate 5.
Press. Further, the disk plate 2a also bends, and the disk plate 2a is pressed against the end surface 6a of the body 6 and the end surface 4a of the piston 4 and locked.

However, the piston 4 is connected to the end of the piston 4 and the body 6.
Are fixed by a plate 5 on a thin hollow disk, so that the disk plate 2a
In this case, frictional forces are generated at two places between the disk plate 2a and the end face 6a of the body 6, and between the disk plate 2a and the end face 4a of the piston 4.

When the air pressure is released, the piston 4 returns to its original state by the spring effect of the plate 5, and the disk plate 2a also returns, so that the worm wheel can rotate.

[0008]

【Example】

Hereinafter, embodiments of the present invention will be described. FIG. 1 is a plan view of an indexing circle table, and FIG. 2 is a sectional view showing an AA part in FIG.

The rotation force of the worm 1 is transmitted to the table 7 via the worm wheel 2 and the spindle 3. The table rotating body including the worm wheel 2, the spindle 3, and the table 7 is firmly fixed by bolts. The spindle 3 is guided by a bearing 8 provided on the body 6 and a bearing 9 provided on a bearing support 10 fixed to the lower part of the body 6, and can rotate stably. The lower section of the worm wheel 2 has a bellows.
The end portion is formed in a thin disk shape so as to form a disk plate 2a of a clamping member. The thin disk-shaped disc plate 2a and the end face 6a of the body 6 maintain a certain small gap. On the other hand, a piston 4 is fitted into an annular hole coaxial with the spindle 3 formed between the body 6 and the bearing support 10, and the piston 4 and the body 6 are formed into a thin hollow disk-shaped preform. The bolts 5 are fixed to the doors 5 by bolts.

The disc 4 is mounted so as to maintain a certain small gap between the piston 4 and the thin disk-shaped disc plate 2a of the worm wheel 2. The piston 4 receives a thrust by the air pressure guided from the conduction hole 11, and presses the thin disk-shaped disc plate 2a while bending the plate 5 in an arm shape. Disc plate 2a
Also bends until there is no gap between the body end face 6a and the piston 4
Is pressed in a sandwich state with the end face portion 4a. In this state, the table 7 does not rotate unless rotational torque enough to cause slippage acts between the disk plate 2a, the body end face 6a, and the end face 4a of the piston 4. This rotation torque becomes the clamping force of the index circle table.

The clamping force of the index circle table by the piston thrust is as follows. (The relationship of the forces is illustrated in FIG. 4.) T = μ × (Q−f ₁ −f ₂ ) × R × 2 ‥‥ A T ‥‥ Clamping force ‥‥ Disc plate 2a, body 6a and piston
Coefficient of friction between 4a f ₁バ ネ Spring force of deflection of plate 5 f ₂バ ネ Spring force of deflection of disk plate 2a R ‥‥ Smooth radius of sliding surface of disk plate 2a Q ‥‥ Piston Thrust

Note that the clamping force Ta in the conventional example is as follows. Ta = μ × (Q−f ₂ ) × R ‥‥ In the above equation ( ₁ ), f ₁ and f ₂ are much smaller than Q, and the piston thrust Q can be larger than before, so the clamping force is also lower than before. And you get something very large.

When the air pressure is released, the thrust of the piston is eliminated, and the piston 4 returns to the original state by the spring force corresponding to the deflection of the plate 5. Similarly, the disc play
The table 2a is also returned, the clamp is released, and the table 7 becomes rotatable.

[0014]

【The invention's effect】

The clamping force can be greatly increased as compared with the conventional one, and the number of parts can be reduced and the structure can be simplified. Therefore, when the manufacturing cost is reduced, the clamping force can be greatly increased as compared with the conventional case.

[0015]

[Brief description of the drawings]

FIG. 1 is a schematic external plan view of an indexing circle table according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view of a main body of an indexing circle table employing a conventional disk clamp method.

FIG. 4 is a diagram showing a relationship between clamping forces generated in the clamp structure of the present invention.

FIG. 5 is a plan view showing an example of use of a thin hollow disk plate 5 in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Worm 2 ... Worm wheel 2a ... Disc plate 3 ... Spindle 7 ... Table 4 ... Piston 5 ... Plate 6 ... Body 6a ... Body end face

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23Q 1/00-1/76 B23Q 16/10

Claims (1)

(57) [Claims] 1. A thin disk-shaped disk plate which comprises a body and a table rotating body which is rotatably supported by the body, and which is a part of the table rotating body, is fixed by a piston which moves in the axial direction of the body by a pressure fluid. A clamping device for an indexing circular table, which is pressed against an end surface of a body as a body and prevents rotation of the table rotating member, is configured as follows; A) a piston rotation preventing structure for fixing the inner peripheral portion of the thin hollow disk-shaped plate to the piston and fixing the outer peripheral portion of the thin hollow disk-shaped plate to the body; (C) the piston is thin in the axial direction of the body, wherein the thin hollow disk-shaped plate is elastically deformed in the axial direction of the body; Being disposed between the disc-shaped disk plate and the thin hollow disc-shaped plate, (d) when clamping the table rotating body, the thin disc-shaped disc plate is brought into contact with the piston by axial movement of the piston due to the pressure fluid of the piston. A structure in which the piston is pressed against the body end face in a sandwich state, and when the clamp is released, the piston is returned by the spring force due to the elastic deformation of the thin hollow disk-shaped plate.