JPS5928751Y2 - Workpiece index support device - Google Patents

Description

[Detailed description of the invention] This invention sequentially indexes a plurality of machining points formed on the outer circumferential surface of a workpiece to machining positions by rotational indexing of a rotary shaft that has a workpiece attached to one end by gripping the workpiece on its inner diameter. Later, the present invention relates to a workpiece indexing and supporting device that presses the end face of the workpiece against a block fixed to a workpiece support base that supports the rotating shaft.

When multiple machining points formed on the outer peripheral surface of a workpiece, such as an arcuate groove formed on the outer periphery of the inner ring of a constant velocity ball joint, are sequentially indexed to machining positions and then processed using a milling cutter, etc. In this method, the workpiece is supported using the workpiece indexing support device as described above, and after indexing is completed, the workpiece is held between the block and the workpiece by a clamper disposed at a position facing the block. This increases the support rigidity of the workpiece during machining and enables highly accurate machining.

However, in conventional devices, even though the end face of the workpiece is in close contact with the block due to the clamping of the workpiece, the rotational indexing of the workpiece is performed without lifting the workpiece from the block. Therefore, if the sliding resistance generated between the end face of the workpiece and the block is greater than the gripping force of the gripping mechanism due to chips etc. caught between them, the relative force between the workpiece and the gripping mechanism There is a risk that rotation will occur and the next machining location may not be correctly positioned at the machining position.

In view of these conventional problems, the present invention is designed to separate the workpiece from the block by moving the rotating shaft when the workpiece is rotationally indexed. This is designed to prevent relative rotation from occurring between the shaft and the shaft, and examples thereof will be described below based on the drawings.

In FIG. 1, 10 is a workpiece support, and this workpiece support 10 includes an intermediate sleeve 11.12 and bearings 13, 1.
A rotary cylinder 16 is rotatably supported through the rotary cylinder 16, and a rotary shaft 18 is concentrically guided and supported inside the rotary cylinder 16 with only a predetermined amount of axial movement allowed.

One end of the support tube 17 is fixed to the right end surface of the rotating shaft 18, and the other end of the support tube 17 is connected to the intermediate sleeve 12.
It passes through the abutment block 20 fixed to the right end of the abutment block 20 and projects to the right of the abutment block 20.

On the outer periphery of the right end of this support cylinder 17, there is a tapered surface 17 at the tip.
A is formed, and a collet 21 having axial slits cut at a plurality of locations on the circumference is fitted into this.

On the other hand, a piston 25 connected to a collet 21 is fitted into a cylinder chamber 23 formed inside the left end of the rotating shaft 18 through an operating shaft 26 passing through the rotating shaft 18 and the center of the support tube 17. The movement of the piston 25 causes the collet 21 to expand and contract.

Further, a piston 30 is provided on the outer periphery of the left end of the rotating shaft 18.
is fitted into a cylinder chamber 32 formed in a fixed cylinder 31 which is protruded in an annular shape and fixed to the left end of the intermediate sleeve 11, and when pressure oil is supplied to the left chamber of the cylinder chamber 32, the rotation shaft 18 and support tube 17 are integrally moved to the right by a predetermined amount.

A thrust bearing 33 for smoothing the rotation of the rotary shaft 18 is fitted to the right end of the piston 30, and between the thrust bearing 33 and the cylinder chamber 32, the thrust bearing 33 is inserted into the right end of the piston 30. A spring 34 is provided to prevent the ball of the bearing 33 from shifting downward.

Further, on the outer periphery of the rotary cylinder 16, a gear cylinder 35 having tooth grooves carved on the outer peripheral surface thereof is guided so as to be relatively rotatable via a guide sleeve 36, and the tooth grooves of this gear cylinder 35 are
It meshes with the tooth groove of the rack shaft 3γ, which is moved in a direction orthogonal to the axis of the rotating shaft 18 by the indexing cylinder of the enclosure.

Further, on the right side of this gear barrel 35, an indexing barrel 38 is guided and supported on the outer periphery of the rotating shaft 16, and the indexing barrel 38 is guided and supported on the outer periphery of the rotating shaft 16.
It rotates integrally with 6.

As shown in FIG. 2, a pair of engaging pawls 40 and 40 are pivotally supported on the right end surface of the gear barrel 35 in a plane parallel to the right end surface, and a spring 41 .
41, the tip engaging portion is pressed against the left end outer circumferential surface of the index tube 38, and on the left end outer circumferential surface of the index tube 38, engagement grooves 38a, which together constitute a ratchet mechanism, are carved at predetermined angles. It is set up.

As a result, one reciprocating movement of the rack shaft 37 causes the rotary cylinder 1 to
6 is rotated by a predetermined angle, and as a result, the rotating shaft 18 and the support tube 17 are rotationally indexed by a predetermined angle, and the workpiece W is rotated by a predetermined angle.
Processing points Wa formed on the outer periphery of the machine are sequentially indexed to processing positions.

On the other hand, as shown in FIG. 3, a plurality of engagement recesses 38b are formed on the outer periphery of the central portion of the indexing tube 38 at angular intervals equal to the predetermined angle, and the indexing mechanism 38 has a plurality of engagement recesses 38b formed at angular intervals equal to the predetermined angle. After the operation, when the piston 43 of the cylinder device 42 installed on the upper part of the workpiece support table 10 is lowered, the tip of the piston rod 45 protruding below the piston 43 engages with the engagement recess 3.
8b to position the rotating shaft 18.

Reference numeral 50 denotes a clamping device disposed at a position facing the contact block 20 while sandwiching the workpiece W;
A shaft-shaped clamper 52 is mounted on the base 51 of the rotary shaft 18.
A piston 55 that fits into a cylinder chamber 53 provided inside the base 51 is integrally formed at the rear end of the clamper 52 .

Therefore, when pressure oil is supplied to the right chamber of the cylinder chamber 53, the clamper 52 moves toward the workpiece support stand 10, and the tip engaging portion of the clamper 52 engages with the end surface of the workpiece W on the collet 21. Then, the workpiece W is pressed against the abutment block 20 and the workpiece W is clamped together with the abutment block 20.

When performing rotational indexing of the workpiece W in the apparatus configured as described above, the clamper 52 is moved back by supplying pressure oil to the left chamber of the cylinder chamber 53 of the clamping device 50 to release the clamping of the workpiece W. Thereafter, the piston 30 is moved to the right end by supplying pressure oil to the left chamber of the cylinder chamber 32 of the workpiece holding table 10, and the rotating shaft 18 and the support tube 17 are moved rightward by a predetermined amount.

As a result, the workpiece W is moved to the right by a predetermined amount with respect to the abutment block 20, as shown in FIG. 4, and a predetermined gap is created between the end surface of the workpiece W and the abutment block 20.

Thereafter, the rotary shaft 18 is rotated by a predetermined angle by the above-mentioned indexing mechanism to rotationally index the workpiece W, and one of the plurality of machining points Wa provided on the outer peripheral surface of the workpiece W is positioned at a machining position. However, since there is a gap between the workpiece W and the abutment block 20, no sliding resistance acts between them, and when the rotation of the workpiece W is indexed, the workpiece W and the collet 2
1 can be prevented from slipping.

As described above, in the workpiece indexing and supporting device of the present invention, prior to rotational indexing of the workpiece, the end face of the workpiece is easily moved from the abutment block by the axial movement of the rotating shaft that supports the workpiece. Since the shift device is provided, even if the end face of the workpiece is pressed against the abutment block during machining, sliding resistance will not act between the end face of the workpiece and the abutment block when rotating and indexing the workpiece. As a result, during rotational indexing of the workpiece, it is possible to prevent the installation phase of the workpiece from shifting with respect to the rotational axis, and there is an advantage that highly accurate indexing can be performed.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view showing the structure of a workpiece support and a clamp device, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. The figure is a sectional view taken along the line ■--■ in FIG. 1, and FIG. 4 is a partial sectional view showing a state in which the workpiece W in FIG. 1 is separated from the abutment block 20. 10... Workpiece support stand, 16... Rotating tube, 17... Support tube, 18... Rotating shaft, 21... Collet , 23... Cylinder chamber, 25... Piston, 26... Operating shaft, 30... Piston, 32... Cylinder chamber, 35 ...Gear tube, 37...
Rack shaft, 38... Index tube, 40...
Engagement claw, 50... Clamp device, 52...
...Clamper, 53...Cylinder chamber, 55...
... Piston, W ... Workpiece, Wa ...
...Processing location.

Claims (1)

[Scope of utility model registration request] A workpiece indexing support device that grips a workpiece on its inner diameter and sequentially indexes a plurality of machining points provided on the outer circumference of the workpiece to machining positions by rotating and indexing the workpiece, the workpiece support table comprising: a rotary cylinder that is rotatably supported on the workpiece support; a rotary shaft that is guided and supported within the rotary cylinder by allowing only a predetermined amount of axis movement; and a rotary shaft that is fixed to one end of the rotary shaft and that supports the workpiece a gripping mechanism that grips an object on its inner diameter; a gripping mechanism operating device provided on the rotating shaft; and an indexing mechanism that rotates the rotary cylinder by a predetermined angle to rotationally index the workpiece gripped by the gripping mechanism. , an abutment block fixed to one end of the workpiece support base and abutting against one end surface of the workpiece mounted on the gripping mechanism; and a shift device for separating the one end surface of the workpiece from the contact block.