JPH0611726Y2 - Indexing table - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an indexing table having an improved fixing force during processing and improved processing accuracy.

<Prior Art> FIG. 2 shows an example of a conventional indexing table. The indexing table 50 includes a table 54 on a base 52,
A central shaft 56 is integrally fixed to the center of the table 54, and a clamp device 58 for the table 54 is provided in the base 52. This clamp device 58 has a base 52.
A piston 62 integrally fixed to the central shaft 56 is provided in a cylinder 60 provided therein, and each of the cylinder chambers 60a, 60 in the cylinder 60 defined by the piston 62 is provided.
An oil pipe 65 is connected to b through the switching valve 64. Then, pressure oil is introduced into the upper cylinder chamber 60a, the piston 62 is pushed down, and the table 54 is pressed against the base 52 via the central shaft 56 to clamp the table 54.

<Problems to be Solved by the Invention> However, in the conventional indexing table 50 described above, the back surface of the table 54 is pressed against the base 52 to be clamped. In some cases, the lifting of 54 causes the deterioration of the processing efficiency, the processing ability, the processing accuracy, and the like. On the other hand, if the pressing force is increased for the purpose of preventing the table 54 from rising, the force applied to the table 54 increases, which causes deformation of the table 54 itself and deteriorates accuracy.

<Means for Solving the Problems> Therefore, in the present invention, in the indexing table that fixes the table by pressing it on the base using fluid pressure, a pressing member is extended on the outer periphery of the table, It is characterized in that a second clamp device is provided further on the outer peripheral side of the table so as to actuate the pressing member toward the pressing direction toward the base so that the clearance between the pressing member and the pressing member becomes zero at the operating end.

<Operation> The second clamp device is operated to set the gap between the pressing member and the pressing member to 0, and the lifting of the table is prevented without increasing the pressing force of the table.

<Embodiment> FIG. 1 shows an embodiment of the indexing table according to the present invention. Like the indexing table 50 described in the conventional example, the indexing table 2 has a table 6 placed on a base 4 and a central shaft 8 integrally fixed to the table 6 inserted into the base 4. ing. Further, a clamp device 10 is provided inside the base 4, and a piston 12 attached to the central shaft 8 is slidably installed in a cylinder 14,
An oil pipe 18 from a switching valve 16 communicates with each of the cylinder chambers 14a and 14b defined by the piston 12, and a second clamp device 20 is further provided on the base 4. Further, the pressing member 2 is provided on the outer periphery of the table 6.
2 is extended, and the pressing member 22 is pressed to the base 4 side by the second clamp device 20.

The second clamp device 20 is provided further outside the outer circumference of the table 6 and holds the holding member 22 extended on the table 6 at a predetermined position. Specifically, the piston 2 is placed in the outer frame 24 fixed on the base 4.
6 is slidably provided, the piston 26 is engaged with the pressing member 22, and a cylinder chamber 28 formed by the outer frame 24 and the piston 26 communicates with the oil pipe from the cylinder chamber 14a. When the piston 26 is pushed down by the hydraulic pressure from the cylinder chamber 28 and its bottom portion comes into contact with the base 4, just as the table 6 is pressed against the base 4, the piston 26 is pressed against the pressing member 22. Gap 0
It is designed to engage with. Reference numeral 30 on the bottom side of the piston 26 is a spring for pushing the piston 26 upward when the hydraulic pressure in the cylinder chamber 28 decreases.

According to the indexing device 2 described above, the switching valve 16 is switched to clamp the table 6, and the pressure oil is supplied to the cylinder chamber 14a.
, The piston 12 descends to move the table 6 to the base 4
The pressure oil is introduced from the cylinder chamber 14a into the cylinder chamber 28 of the second clamp device 20 at the same time as the piston 26 is lowered to hold the pressing member 22 as a gap 0. In this way, the table 6 is pressed against the base 4 via the piston 12 and is held by the second clamp device 20 via the pressing member 22, so that the clamping force is increased and floating can be prevented. In addition, the holding by the second clamp device 20 does not require high pressure because the load is not applied so as to further lower the table 6 which is in contact with the base 4, and the table 6 is deformed through the second clamp device 20. Never.
When the switching table 16 is released from the clamping of the switching table 6, the piston 26 is pushed upward by the spring 30 and the holding of the pressing member 22 is released. Further, the pressure oil introduced into the cylinder chamber 28 of the second clamp device 20 is used for pressing the table 6 in the cylinder chamber 14
Since the pressure oil introduced in a is diverted, the hydraulic piping does not become complicated.

<Effect of the Invention> The indexing table of the present invention is provided with the second clamp device for pressing the outer periphery of the table toward the base with the gap between the pressing end and the pressing member set to 0 at the working end. The lifting of the indexing table, which is the cause, can be prevented without using high-pressure hydraulic pressure. As a result, the indexing table is prevented from rising without being deformed, and the workpiece mounted on the indexing table can be machined in a stable state, improving machining accuracy, machining efficiency, and machining capacity. be able to.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an indexing table according to the present invention, and FIG. 2 is a sectional view showing a conventional example. In the drawing, 2,50 is an indexing table, 4,52 is a base, 6,54 is a table, 8,56 is a central shaft, 10,58 is a clamp device, 16,64 is a switching valve, and 20 is a second clamp. A device, 22 is a holding member, and 26 is a piston.

Claims (1)

[Scope of utility model registration request] 1. In an indexing table for fixing a table by pressing it on a base using fluid pressure, a pressing member is extended on the outer periphery of the table, and the pressing member is pressed toward the base. An indexing table, further comprising a second clamp device which is operated in a mounting direction and has a clearance between the pressing member and the pressing member set to be 0 at an outer end of the table.