JP2005153045A - Workpiece drive device for cylindrical grinding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a workpiece drive device for a cylindrical grinding machine in which a workpiece can be easily gripped in work at both centers mainly with a grinding machine and which can eliminate the occurrence of failure at a bearing part caused by grinding dust in a grinding liquid. <P>SOLUTION: An inner ring member 6, to which a gripping claw 9 for gripping a workpiece is mounted, is fitted to a lathe center via a bearing 5 in order to lightly operate the gripping claw 9 for gripping a workpiece in the workpiece drive device for a cylindrical grinding machine. The bearing 5 is for slightly driving the gripping claw 9. About one tenth of rotation is sufficient for slightly driving the gripping claw 9. However, a trouble, in which the grinding powder in the grinding liquid is solidified and deposited to the bearing, arises. The bearing is continuously rotated during grinding work in order to eliminate the trouble. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention provides a work drive device for a cylindrical grinder that supports a work by a main race side race center and a center of a tailstock side of a machine, and transmits the rotation of a rotary drive arm mounted on the main shaft by a gripping claw to the work. Concerning structure.

Regarding the clamp member that grips the outer peripheral surface of the cylindrical workpiece held at both centers and transmits the rotation of the spindle to the workpiece, the drive shaft attached to the spindle of the grinding machine rotates the workpiece gripping claw. 2. Description of the Related Art Work drives for cylindrical grinders are often used that are configured to hold a workpiece, rotate the workpiece, stop rotation, and simultaneously release the workpiece.

  For example, an inner ring plate 4 is fitted and attached to the outer peripheral surface of the race center 2 supporting the workpiece via the first bearing 3, and the outer ring 6 is connected to the outer periphery of the inner ring plate 4 via the second bearing 5. A drive that engages and engages, and engages with a drive shaft 22a attached to the main shaft of the grinding machine by engaging the tip of a drive arm 7 pivotally supported on the back surface of the outer ring 6 with a guide pin 4a inserted through the inner ring plate 4. The inner ring plate and the outer ring plate are rotated in the opposite directions by the movement of the arm 7, the base end is engaged with the drive pin 10 erected on the outer ring, and the gripping claw 9 pivotally supported by the float plate 8 on the inner ring surface is rotated. There is a work drive device 1b (FIG. 4) for a cylindrical grinder configured to move and grip a work W (Patent Document 1).

In another patent document, a clamp body is rotatably fitted on the front end side of the main shaft via a bearing, and a plurality of clamp claws for clamping a workpiece to the clamp body are rotated at equal intervals in the circumferential direction. There has been disclosed a work drive device for a grinding machine that is freely pivotally supported and the clamp pawl clamps or unclamps the workpiece in conjunction with the rotation of the clamp body (Patent Document 2).
JP-A-11-309651 No. 07-053848

  In the above-described work drive device for a cylindrical grinding machine described in Patent Document 1, if the inner ring plate and the outer ring plate rotate approximately 1/10 to 1/20 in opposite directions, the gripping claws are designed to hold the workpiece sufficiently. Has been. Also, in the work drive device for grinding machine disclosed in Patent Document 2, it is sufficient for the clamp pawl to clamp the work if the bearing portion pivotally supporting the clamp pawl rotates 1/3 to 1/4. This is the same as described above. Accordingly, during the grinding operation, only the first bearing 3 fitted to the outer peripheral surface of the race center 2 (or the bearing fitted to the front end side of the main shaft) rotates and the second bearing 5 fitted to the outer circumference of the inner ring plate 4 is rotated. (Or a bearing that pivotally supports the clamp pawl) is in a stationary state.

  When the workpiece is clamped on the drive device in this way and the grinding liquid is poured and ground, the grinding powder is mixed into the grinding liquid. This grinding fluid circulation system usually incorporates a process for filtering the grinding powder, but when the workpiece is cemented carbide or ceramics, very fine grinding powder is generated, which is used as a filter. It circulates in a state where it goes through and is reused. The grinding fluid poured into the workpiece is splashed into the work drive device and enters the bearing.

Since the first bearing is always rotating, the submerged abrasive powder mixed with abrasive powder scatters due to the centrifugal force generated by the rotation. Therefore, there is almost no grinding powder staying there. Since the second bearing provided between the one inner ring plate and the outer ring plate stops rotating during the grinding operation as described above, the grinding fluid that has entered the bearing stays there. Next, even when the grinding operation is finished and the workpiece is released, the rotation of the bearing is only 1/10 to 1/20, and the grinding liquid in the bearing cannot be completely discharged by this rotation. It is. Therefore, the remaining grinding fluid is naturally dried after the work is completed, and the grinding powder is solidified. The accumulated layer of grinding powder formed by repetition of the retention and drying of the grinding fluid remarkably hinders the rotation of the bearing, and eventually the rotation becomes impossible and the workpiece cannot be gripped.

  In the present invention, an inner ring member 6 and an outer ring member 4 are fitted via a bearing 5 and a bearing 3 arranged in parallel to the outer periphery of the front end of the race center 2, and a grip 10 is rotatably supported on the surface of the inner ring member 6. One end of the claw 9 is engaged with a drive pin 11 projecting from the outer ring member 4, while the shaft 13 is pivotally supported on the back surface of the outer ring member 4, and a shaft hole 12 c at the tip thereof is erected on the back surface of the inner ring member 6. A drive arm 12 that engages with the drive pin 14 is provided, and the other end of the drive arm 12 is rotated by a transmission pin 22a that protrudes from the face plate 22 of the grinding machine, thereby gripping the shaft support 10 as a fulcrum. As a work drive device for a cylindrical grinder that rotates the claw 9 and grips and opens the workpiece at its end, the bearings 3 and 5 continue to rotate even during the grinding operation.

Further, the outer ring member 4 and the inner ring member 6 fitted to the outer periphery of the front end portion of the race center 2 via bearings 3 and 5 are respectively provided with gripping claws 9 engaged with the shaft support 10 and the drive pin 11 by the holding ring 9c. A work drive device for a cylindrical grinding machine that grips and opens the work W by the rotation of the drive arm 12 that is pivotally supported on the back surface of the member 4 and engages with the drive pin 14 whose tip 12c is erected on the inner ring member. The two bearings 3 and 5 are configured to be fitted adjacent to the outer periphery of the front end of the race center 2.

In the work drive device for the cylindrical grinding machine of the present invention having the above-described configuration, the bearing portion is always rotating during the grinding operation, so that the grinding fluid mixed with the grinding powder does not stay, and therefore the grinding fluid There is no accumulation of grinding powder due to drying.

In the work drive device for cylindrical grinders, when grinding powder accumulates on the rolling part of the bearing (ball bearing), it is a matter of course that smooth rotation cannot be obtained, and there is no way to take out this deposit, Such trouble disappears.

  In the conventional example of the work drive device, the inner ring member is fitted to the outer periphery of the front end of the race center 2 via a bearing, and the outer ring member is fitted to the outer diameter of the inner ring member via the bearing. However, the work drive device of the present invention can reduce the outer diameter of the work drive device by mounting the outer ring member and the inner ring member adjacent to each other on the outer periphery of the race center 2 via the bearings 3 and 5. Thus, workability is improved and surface shake of the apparatus is reduced.

  By attaching two bearings 3 and 5 adjacent to the outer periphery of the front end of the race center 2 and mounting the outer ring member and the inner ring member, it is assumed that no accumulation of grinding powder occurs in the bearing part.

One example of a work drive device for a cylindrical grinding machine according to the present invention will be described with reference to the drawings. As shown in FIG. 1, this apparatus 1 has a cup-shaped outer ring member 4 attached to a front end portion of a shank 2 that is taper-fitted to a spindle inner diameter of a grinding machine (not shown) via a first bearing 3 (ball bearing). Further, an inner ring member 6 that is rotatably accommodated in the cup-shaped portion of the outer ring member 4 is mounted via a second bearing 5 adjacent to the distal end side of the first bearing 3. . A ring-shaped float plate 7 is screwed to the surface of the inner ring member 6 by a bolt 8 having a neck portion having a smaller diameter than the mounting hole 7a, and can swing in parallel with the surface. Yes. Further, three gripping claws 9 having tips formed in a cam shape 9a are pivotally supported by pivots 10 at the fulcrum holes 9b at the positions corresponding to three equal parts in the surface circumferential direction. A U-shaped portion 9c provided on the base end side of the cup-shaped outer ring member 4 is engaged with three drive pins 11 erected at equal intervals in the front-side circumferential direction of the cup-shaped outer ring member 4. In addition, a washer 10 a for providing an appropriate space between the float plate 7 and the gripping claws 9 is mounted in a state of being fitted to the shaft 10.

On the back side of the cup-shaped outer ring member 4, a drive arm 12 having a U-shaped groove-like engagement portion 12 a at the base end is pivotally supported by an intermediate portion 12 b so as to be rotatable. Is provided with a shaft hole 12c. Corresponding to the shaft hole 12 c, a long hole 4 c is formed in the bottom wall surface of the cup-shaped outer ring member 4, and a drive pin 14 that passes through the long hole 4 c and engages with the shaft hole 12 c is provided on the inner ring member 6. Stands on the back.

A method of using the work drive device for the cylindrical grinding machine according to the above embodiment will be described. The taper shank portion 2a of this drive device is inserted into the main shaft hole 21 of the cylindrical grinding machine 20 or the like and is firmly fitted. Then, in order to transmit the rotation of the main spindle of the grinding machine, a transmission pin 22a protruding from the face plate 22 of the grinding machine is inserted into the U-shaped portion 12a of the drive arm 12.

First, the gripping claw 9 rotates in the opening direction by driving the driving arm 12 in the clockwise direction. Next, one side center hole of the workpiece W is brought into contact with the sharp end 2b of the race center 2, and the core push stand side center 23 is pressed against the center hole on the other side to support so-called both centers. Then, the main spindle of the grinding machine is rotated counterclockwise (positive). As a result, the base end of the drive arm 12 advances counterclockwise (refer to the arrow in FIG. 2 below) with the shaft support 13 as a fulcrum, and the drive shaft 14 that engages the tip side from the fulcrum rotates in the reverse direction. Be moved. Therefore, the inner ring member 6 to which the drive shaft 14 is fitted and fixed and the float plate 7 attached to the surface of the inner ring member 6 also rotate clockwise. Further, the gripping claws 9 that are pivotally supported on the float plate 7 and whose base ends are engaged with the drive pins of the cup-shaped outer ring member 4 are each rotated counterclockwise in FIG. This movement causes the tip cam-like portions 9a of the three gripping claws 9 to move toward the center of the device 1 to grip the workpiece W, and at the same time, the rotation of the main shaft is transmitted to the outer ring member 4 and the device. 1 will be rotated. In this case, the bearings 3 and 5 through the outer ring member 4 and the inner ring member 6 and the race center 2 continue to rotate during the grinding operation, and the grinding fluid poured into these bearings 3 and 5 is the centrifugal force of rotation. The bearings 3 and 5 do not accumulate and solidify grinding powder even after being dried.

In the workpiece W gripped as described above, the positions of the center holes at both ends may not be at the center position of the workpiece end surface, and a so-called core blur state may occur. In this case, the float plate 7 moves in the direction of the runout so that the three gripping claws 9, 9, 9 can hold the workpiece with equal pressure.

The workpiece W by the above is held and grinding work is performed. When the work is finished, the rotation of the main spindle of the grinding machine is stopped. By stopping the rotation of the grinding machine, the drive of the transmission pin 22a is stopped, and at the same time, the drive arm 12 engaged with the transmission pin 22a is also stopped. However, the stop timing of the work drive device holding the work W is slightly delayed due to the repulsive force of rotation. Accordingly, the stopped drive arm 12 rotates in the reverse direction with respect to the rotation of the outer ring member 4, and the inner ring member 6 and the float plate 7 are rotated in the opposite direction with respect to the outer ring member 4. As a result, the gripping claw 9 releases the gripping of the workpiece W, and eventually the workpiece drive device itself stops. Thereafter, the work is taken out.

FIG. 3 shows a work drive device 1a according to the second embodiment. In the second embodiment, the shape of the outer ring member 4 is formed in a flat plate shape and is fitted to the race center 2 via the first bearing 3 in the same manner as in the first embodiment, and the inner ring member 6 is fitted to the outer ring member 4. It is fitted through the second bearing 5 adjacent to the front side. In addition, the configuration of the float plate 7, the gripping claws 9, the gripping claw drive pins 11, the drive arms 12, the float plate drive pins 14 and the like is exactly the same as in the first embodiment, and the description thereof is omitted.

The work drive device 1a of the second embodiment is characterized by being able to cope with a case where the diameter of a work to be gripped is large (see FIG. 3), but can be manufactured at a low cost with a simple configuration. Further, the grinding fluid that has entered the inside of the bearings 3 and 5 can be scattered linearly between the side surfaces of the outer ring member 4 and the inner ring member 6 by centrifugal force. The greatest merit is that there is almost no accumulation of grinding powder on the surface.

In a machine tool such as a cylindrical grinder or a lathe, or a shaft runout measuring device for shafts, a work is often supported by both centers. Both the center operations require a rotary drive device called “Kele”, and the work drive device according to the present invention is usefully used as a drive device for such operations.

It is the center sectional view showing the 1st example of the work drive device for cylindrical grinding machines concerning the present invention. It is a front view of FIG. It is the center sectional view showing the 2nd example of the work drive device for cylindrical grinding machines concerning the present invention. It is the work drive device for cylindrical grinders shown as one of the prior art examples.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Work drive apparatus 2 for cylindrical grinders Shank 3 1st bearing 4 Cup-shaped outer ring member 5 2nd bearing 6 Inner ring member 7 Float board 8 Bolt 9 Holding claw 10 Shaft support 11 Drive pin 12 Drive arm 13 Shaft support 14 Drive pin

Claims (2)

A race center (2) for supporting the workpiece by inserting the sharpened portion into one of center holes provided at both ends of the workpiece, and a front bearing outer peripheral surface of the race center (2) via a first bearing (3) The cup-shaped outer ring member (4) fitted and mounted, and the inner ring member (6) accommodated in the cup-shaped portion via the second bearing (5) on the outer peripheral surface on the front end side from the first bearing (3). A ring-shaped float plate (7) attached to the surface of the inner ring member (6) in a swingable manner, and three drives erected on the front side surface of the cup-shaped outer ring member (4) at equal intervals in the circumferential direction. A pin (11) and a base end are engaged with the drive pin (11), and an intermediate portion is rotatably attached to the surface of the float plate (7) by a shaft (10). ) Formed with a gripping claw (9) and a U-shaped groove-like engagement portion at the base end A drive arm (12) having a shaft hole (12c) formed at the distal end side is pivotally supported (13) on the back surface of the cup-shaped outer ring member (4), and the shaft hole (12c) A work drive device for a cylindrical grinder characterized by having a structure engaged with a drive pin (14) projecting from the inner ring member (6) in the back surface direction. An outer ring member (4) and an inner ring member (6) are rotatably fitted to the front end portion of the race center (2) via bearings (3) and (5), and the outer ring member and the back side of the inner ring member Is engaged with a drive arm (12) via a shaft support (13) and a drive pin (14), and a float plate (7) is attached to the surface side of the inner ring member, and the outer ring member and the float plate are connected to each other. In the work drive device for a cylindrical grinding machine in which a work gripping claw (9) is engaged with a shaft support (10) and a drive pin (11) protruding from the outer ring member at a position equally divided into three in the circumferential direction, the outer ring member 4 and the inner ring member (6) are fitted to the front end portion of the race center 2 via a bearing, a work drive device for a cylindrical grinding machine.

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