JP2845756B2 - Swing jig bearing clamp device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing clamping device for fixing a rotating jig for positioning and holding a work to be worked, for example, after rotating it to a predetermined angle.

[0002]

2. Description of the Related Art Conventionally, there has been known an apparatus for processing a workpiece clamped by a jig base unit with a spindle tool of a processing unit.
For example, Japanese Patent Application No. 5-22863 filed by the present applicant.
A jig stand unit disclosed in No. 5 is known.

[0003] This jig base unit is provided with a turning jig rotatable around a vertical axis at the center of a gate-shaped support frame, and the clamping surface side of the turning jig faces the opposite side of the processing unit. When the work is clamped, the turning jig is rotated 180 degrees around the vertical axis to face the processing unit side, and is processed by the spindle tool of the processing unit.

For this purpose, the upper and lower shafts of the turning jig are supported by bearings of a support frame, and a turning motor for rotating the turning jig is mounted above the support frame, and a turning motor is provided below the support frame. A clamp mechanism is provided for pressing the outer peripheral portion of the jig and clamping it at a predetermined position.

[0005]

When the centering accuracy of a bearing mechanism such as a tapered roller bearing is to be improved, the bearing is preloaded with a constant pressure to eliminate a gap between the shaft and the bearing. Is common. However, in the case of bearings with bearings with large vertical spacing as in the above device, if the upper and lower bearings are assembled in a state of misalignment and a predetermined preload is applied to the bearings, the rotational torque must be abnormally high unless the bearing is abnormally high. In addition to the fact that the bearing does not rotate and a high load is applied, there is a problem that the bearings are forced to be worn and the wear is accelerated.

On the other hand, even if an attempt is made to eliminate the misalignment by increasing the assembling accuracy, the misalignment could not be completely eliminated finally due to other misalignment factors such as thermal distortion and processing errors. Further, in the case of the above-mentioned device, there is a problem that the occupied area becomes large because the clamp mechanism projects outside the lower part of the jig column.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a rotating jig in which shafts at both ends of the rotating jig are rotatably supported, and the rotating jig is clamped at a predetermined rotation position. At least one of the shafts at both ends of the turning jig is supported by a tapered roller bearing, and a preload adjusting piston is disposed adjacent to the inner ring end of the tapered roller bearing. The adjustment piston can press the inner ring toward the small diameter side of the conical roller along the axial direction.

A shaft at the other end of the turning jig is a hollow shaft, a disk member is fixed along the inner periphery of the hollow shaft, and both surfaces of the disk member and an inner end surface of the ring are thrust and radial receiving members. Bearings are now supported by bearings.

Further, a sleeve is fitted around the outer periphery of the hollow shaft, and a portion of the sleeve corresponding to the outside of the disk member is expanded by pressing means, and the outer peripheral portion of the hollow shaft is tightened by the expanding action. I made it.

[0010]

The inner ring of the taper roller bearing is pressed toward the smaller diameter side of the conical roller by the preload adjusting piston (preload is applied), so that the inner ring is fixed at the centering position by the wedge action of the conical roller. . In addition, if the preload adjusting piston is moved to the large diameter side of the conical roller (the preload is released), the tightening of the shaft by the inner ring is automatically loosened.

In other words, preloading the bearing,
Since the preload can be released freely, for example, when rotating the turning jig, if the preload is released, the rotation can be smoothly performed, and if the preload is applied, any position can be arbitrarily fixed.

The other end supports the bearing in the thrust direction and the radial direction via a disk member fixed along the inner periphery of the hollow shaft. Further, if the outer periphery of the hollow shaft on the other end side is clamped by being clamped with a sleeve, the entire turning jig can be firmly fixed. At this time, by setting the clamp portion at a position corresponding to the outside of the disk member, the rotation preventing force works effectively. Further, neither of the clamping mechanisms of the shafts at both ends of the turning jig protrude outside, which is advantageous in terms of space.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bearing clamping device for a turning jig according to the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is a layout view of the entire processing apparatus, FIG. 2 is a side view of a jig base unit to which the bearing clamping device of the present invention is applied, FIG. 3 is a front view thereof, and FIG. FIG.

First, an outline of the entire processing apparatus will be described with reference to FIG. 1. The processing apparatus includes a jig base unit 1 for clamping a work W and a processing unit 2 for processing the work W. , A movable frame 4 movable along the rail 3 in the direction perpendicular to the plane of the drawing, a movable column 5 movable along the movable platform 4 in the left-right direction of the figure, and a movable column 5 A plurality of spindles 6, 6 which are independently movable in the vertical direction are provided, and tools 7, 7 are detachably attached to the tips of the spindles 6, 6.

On the other hand, the jig stand unit 1 includes a portal-shaped support frame 10 erected on a base 8 and a pivoting jig provided inside the portal frame of the support frame 10 so as to be rotatable around a vertical axis. A tool 11 (FIG. 3) and a turning motor 12 for rotating the turning jig 11 are provided. The turning motor 12 is fixed to an upper portion of the support frame 10 and, in the case of the embodiment, is turned with the turning jig 11. As shown in FIG. 3, two sets of motors 12 are provided in parallel.

The turning jig 11 is provided on a fixed table 9 integrated with the base 8 as shown in FIGS.
On the work clamp surface side of the turning jig 11, clamp arms 13, 13 which can move forward and backward are provided vertically.

By the way, as shown in FIG.
An upper turning shaft 14 connected to the motor shaft is provided at the upper center of 1, and a lower turning shaft 15 formed as a hollow shaft is provided at the lower center.

The upper turning shaft 14 is rotatably supported by a tapered roller bearing 17 mounted in a bearing insertion hole 16a of a motor housing 16 fixed to the support frame 10, and the lower turning shaft 15 is It is rotatably supported by a thrust / radial receiving bearing 18 provided on the peripheral edge of the inner cylindrical projection 9a.

Next, the details of the bearing structure of the upper turning shaft 14 will be described with reference to FIG. 5. A pair of upper and lower tapered roller bearings with an intermediate collar member 20 interposed therebetween is inserted into a bearing insertion hole 16a of the motor housing 16. 1
7, 17 are provided.

The tapered roller bearing 1
Reference numeral 7 denotes a well-known form, in which a plurality of conical rollers 17b,... Are disposed along the circumferential direction between an inner ring 17a and an outer ring 17c, and the collar member 20 is provided with upper and lower outer rings 17c, 17c.
It is interposed with a slight gap between them.

The upper and lower tapered roller bearings 1
The directions of 7 and 17 are such that the small diameter sides of the conical rollers 17b and 17b face each other, so that they can receive loads from both directions in the thrust direction, and the upper and lower inner rings 17a , 17a, a return spring 21 is provided.

As will be described later, the return spring 21 releases the upper tapered roller bearing 17 when the preload on the upper tapered roller bearing 17 is released.
Is for surely pushing back upward. However, the spring 17 is not essential, and the spring 1
If the preload is not applied to the upper tapered roller bearing 17 even if the roller 7 is not provided, the tapered roller bearing 17 naturally moves in a loosening direction (upward).

On the upper part of the upper tapered roller bearing 17, a preload adjusting piston 22 is provided in contact with the upper end surface of the inner ring 17a. The preload adjusting piston 22 is slidable up and down along the upper turning shaft 14,
Further, a cylinder 23 for slidably holding the preload adjusting piston 22 is provided on the outside thereof.

The cylinder 23 has a small-diameter portion 14a of the upper turning shaft 14 rotatably inserted therein, and an upper end thereof is fixed to a lower surface of the turning motor 12 with a bolt 24. Piston 2
2 is provided with a pressure oil supply passage 23a for hydraulically driving the pressure control valve 2. The outer ring 17 of the upper tapered roller bearing 17
A retaining member 25 for retaining is engaged with the upper end surface of the member c.

In such a structure around the upper turning shaft 14, when the turning jig 11 is fixed, the pressure oil supply passage 23a
To press the preload adjusting piston 22 downward with a strong force. That is, the preload state is set. Then, the inner ring 17a of the upper tapered roller bearing 17 is lowered, and the upper turning shaft 14 is tightened and fixed by the wedge action received from the conical roller 17b.

Next, when rotating the turning jig 11, the supply of the hydraulic pressure to the pressure oil supply passage 23a is stopped. Then, the inner ring 17a of the upper tapered roller bearing 17 is pushed back upward by the return spring 21, and the tightening force on the upper turning shaft 14 is weakened, so that the backlash is generated. Since the lower tapered roller bearing 17 does not apply a preload in the assembled state, it usually has a certain degree of play. Incidentally, even when the return spring 21 is not provided as described above, if the preload is stopped, the tightening force by the inner race 17a naturally decreases. Therefore,
If it is rotated in this state, it can be easily rotated with a light force.

Next, the details of the bearing structure of the lower turning shaft 15 will be described with reference to FIG. 6. As described above, the lower turning shaft 15 is formed as a hollow shaft. Form an inner cylindrical projection 9a and an outer cylindrical projection 9b.

The lower turning shaft 15 is supported so as to be fitted into a concave portion between the inner cylindrical projection 9a and the outer cylindrical projection 9b. That is, the disk member 26 is provided along the circumferential direction in the hollow inside of the lower turning shaft 15.
Is fixed, while the inner cylindrical projection 9 of the fixed table 9 is fixed.
A thrust / radial receiving bearing 18 having a substantially U-shaped cross section is attached along the circumferential direction of the peripheral edge portion a. A pair of rollers 27, 27 for receiving the upper and lower surfaces and a roller 28 for receiving the inner end surface of the ring of the disk member 26 are provided.

Therefore, the thrust / radial receiving bearing 18 can receive loads in both the thrust direction and the radial direction. Also, the lower pivot 15
A sleeve 30 is interposed between the outer circumference of the outer cylindrical projection 9b and the inner circumference of the outer cylindrical projection 9b. The upper end of the sleeve 30 is fixed to the upper surface of the outer cylindrical projection 9b by a screw 31.

An intermediate portion of the sleeve 30 corresponding to the outside of the disk member 26 is a thin portion 30a which is easily bent in the radial direction.
The pressure chamber 32 is formed between a and the inner peripheral surface of the outer cylindrical projection 9b.

The pressure chamber 32 communicates with a pressure oil supply passage 33 formed on the outer cylindrical projection 9a.
Therefore, when pressure oil is supplied to the pressure chamber via the pressure oil supply passage 33, the thin portion 30a of the sleeve 30 expands inward, and tightens the outer peripheral portion of the lower turning shaft 15.

At this time, the thin portion 30a is
, That is, outside the bearing portion, the rotation preventing force effectively acts.

An outline of the operation of the bearing clamp device having the above configuration will be described. First, when processing a workpiece W in a processing apparatus as shown in FIG. 1, first, the workpiece W is clamped with the workpiece clamping surface of the turning jig 11 of the jig base unit 1 facing the opposite side of the processing unit 2. .

When the clamping of the work W is completed, the upper turning shaft 14 and the lower turning shaft 15 are set in a free state. That is, with respect to the upper pivot shaft 14, the cylinder 2
The supply of the pressure oil to the pressure oil supply path 23a of No. 3 is stopped, and the supply of the pressure oil to the pressure chamber 32 of the lower swing shaft 15 is stopped.

Then, the tightening force of the upper tapered roller bearing 17 on the upper turning shaft 14 is weakened, and the bearing portion is loosened, and the tightening force of the sleeve 30 on the lower turning shaft 15 is also weakened. Rattling occurs.

Thus, the resistance to rotation is reduced,
The turning motor 12 is operated to rotate the turning jig 11 180 degrees. If the pressurized oil is supplied to the upper pressurized oil supply passage 23a and the lower pressurized oil supply passage 33 after the rotation by 180 degrees, the wedge action of the inner ring 17a of the upper turning shaft 14 due to the pressing of the preload adjusting piston 22 is obtained. Accordingly, the lower pivot 15 is strongly tightened by the inward expansion action of the sleeve 30, and is firmly fixed.

Therefore, if machining is performed with the tool 7 of the machining unit 2 in such a state, machining errors are reduced. Moreover, the clamping mechanism for the upper and lower pivot shafts 14 and 15 does not protrude outside the apparatus, which is advantageous in terms of space.

[0038]

As described above, the bearing clamping device of the present invention has a structure in which both end shafts are supported, and at least one side is supported by a tapered roller bearing, and is provided adjacent to the tapered roller bearing. The preload on the tapered roller bearing can be freely adjusted by the pressure adjustment piston, so loosening the preload when rotating the turning jig reduces the resistance, and increasing the preload when fixing it in place, tightens it. If it is, it can be fixed firmly.
At the same time, the outer periphery of the shaft at the other end is fastened with a sleeve, so that the shaft can be fixed in a more secure state. Further, since the apparatus can be configured with a built-in clamp mechanism, the apparatus can be made compact.

[Brief description of the drawings]

FIG. 1 is a layout diagram of the entire processing apparatus.

FIG. 2 is a side view of a jig base unit to which the bearing clamp device of the present invention is applied.

FIG. 3 is a front view of the same.

FIG. 4 is a partial view of the same part in cross section.

FIG. 5 is a partial sectional view around the bearing structure of the upper swing shaft.

FIG. 6 is a partial sectional view around a bearing structure of a lower swing shaft.

[Explanation of symbols]

11: turning jig, 14: upper turning shaft, 15: lower turning shaft, 17: tapered roller bearing, 17a: inner ring, 1
7b: conical roller, 18: thrust and radial receiving bearing, 22: preload adjusting piston, 26: disk member,
27, 28: roller, 30: sleeve, 30a: thin portion, 33: pressure oil supply path.

Claims (3)

(57) [Claims] In a bearing clamping device for a turning jig, the shafts at both ends of the turning jig are rotatably supported and the turning jig is clamped at a predetermined rotation position. At least one of the shafts is supported by a tapered roller bearing, and a preload adjusting piston is disposed adjacent to the inner ring end of the tapered roller bearing. The preload adjusting piston axially moves the inner ring along a conical roller. A bearing clamping device for a turning jig, characterized in that it can be pressed to the smaller diameter side of the bearing. 2. The bearing clamping device for a turning jig according to claim 1, wherein a shaft at the other end of the turning jig is a hollow shaft, and a disk member is fixed along an inner periphery of the hollow shaft. A bearing clamping device for a turning jig, wherein both surfaces of the disk and the inner end surface of the ring of the disk member are supported by a thrust / radial bearing. 3. The bearing clamping device for a turning jig according to claim 2, wherein a sleeve is fitted around the outer periphery of the hollow shaft at the other end of the turning jig, and the sleeve is outside the disk member. Wherein the outer periphery of the hollow shaft can be tightened by the expansion action of the pressing means.