JP2008307619A - Grinding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding apparatus for grinding the outer circumferential surface and the inner circumferential surface of an annular workpiece, which grinding apparatus can improve machining accuracy by suppressing the positional shift of the suction surface of a chuck when the eccentric direction between the center line of the workpiece and the center line of a main spindle is changed without reassembling shoes, and further can reduce its price. <P>SOLUTION: The chuck having the suction surface for sucking one end surface of the workpiece W in the direction of its center line is mounted on the main spindle. The shoes 7, 8 for supporting the outer circumferential surface of the workpiece W are supported by a shoe moving mechanism 10. The shoe moving mechanism 10 is configured such that the positions of the shoes 7, 8 can be changed to the position for offsetting the center line Y of the workpiece W from the rotation axis X of the main spindle so as to make the workpiece W apply pushing forces against the shoes 7, 8 when the outer circumferential surface is ground, and to the position for offsetting the center line Y of the workpiece W from the rotation axis X of the main spindle so as to make the workpiece W apply pushing forces against the shoes 7, 8 when the inner circumferential surface is ground. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a grinding apparatus for grinding an inner peripheral surface and an outer peripheral surface of an annular workpiece.

  Conventionally, as this type of grinding apparatus, for example, a shoe type centerless grinding apparatus as disclosed in Patent Document 1 is known. The grinding apparatus supports the outer peripheral surface of the work piece with a shoe, and adsorbs the end face of the work piece to an adsorption surface of an electromagnetic chuck attached to a main shaft, and rotates the work piece to rotate the outer periphery of the work piece. The surface and the inner peripheral surface are configured to be down-ground with a grinding wheel.

In this grinding machine, the center line of the workpiece and the rotation center line of the spindle are decentered by a small distance in the radial direction so that when the workpiece is rotated, a pressing force against the shoe is applied to the workpiece. Stable grinding can be performed. That is, when the outer peripheral surface of the workpiece is down-ground and when the inner peripheral surface is down-ground, the rotation direction of the main shaft is different, so the eccentric direction of the center line of the workpiece with respect to the rotation center line of the main shaft is Must be in the opposite direction. In order to correspond to this, in the grinding apparatus of Patent Document 1, the spindle is moved in the radial direction together with the spindle table by the swing table. By moving the main shaft in the radial direction by this oscillating base, the eccentric direction of the center line of the workpiece with respect to the rotation center line of the main shaft is changed, and when the outer peripheral surface of the workpiece is ground down, the inner peripheral surface is lowered. In the case of grinding, the pressing force against the shoe can be applied to the workpiece. By using the oscillating base in this way, it is not necessary to prepare shoes for outer peripheral surface grinding and inner peripheral surface grinding, and it is necessary to prepare shoes for grinding the outer peripheral surface and grinding the inner peripheral surface. Therefore, the outer peripheral surface and the inner peripheral surface can be continuously ground.
JP-A-6-755

  However, in the grinding apparatus of Patent Document 1, as described above, when changing the eccentric direction of the center line of the workpiece with respect to the rotation center line of the main shaft, the head stock is swung. Since the spindle stock is configured to support the spindle on which the electromagnetic chuck is mounted, it is large and heavy, and it is not easy to move with high accuracy. For this reason, for example, when the headstock is switched from the position for outer peripheral surface grinding to the position for inner peripheral surface grinding, the chucking surface of the chuck may be slightly displaced from a predetermined position. If it becomes like this, the workpiece | work adsorbed | sucked to the adsorption | suction surface will shift | deviate from a predetermined position, and a high processing precision will no longer be obtained.

  Also, when the headstock is moved, the headstock is large and heavy as described above, so if you try to move it with high precision, the swinging base including the drive mechanism will be expensive, Eventually, the price of the grinding device will rise.

  SUMMARY OF THE INVENTION The present invention has been made in view of such points, and an object of the present invention is to provide a center of rotation of a main shaft without changing shoes in a grinding apparatus for grinding an outer peripheral surface and an inner peripheral surface of an annular workpiece. When the eccentric direction of the center line of the workpiece with respect to the line can be changed, the positional deviation of the chuck's suction surface can be suppressed to improve the processing accuracy and to reduce the price of the grinding apparatus. .

  In order to achieve the above object, in the present invention, the eccentric direction of the center line of the workpiece with respect to the rotation center line of the main shaft can be changed by fixing the main shaft and moving the workpiece.

  Specifically, in the first invention, in a grinding apparatus for grinding an outer peripheral surface and an inner peripheral surface of an annular workpiece, a main shaft, a main shaft driving unit that drives the main shaft to switch between a normal rotation direction and a reverse rotation direction, and the main shaft A chuck having an adsorption surface for adsorbing one end surface in the center line direction of the workpiece, a shoe for supporting the outer circumferential surface of the workpiece, and contacting the outer circumferential surface of the workpiece, and grinding the outer circumferential surface An outer peripheral grinding wheel that contacts the inner peripheral surface of the workpiece and grinds the inner peripheral surface, supports the shoe, and displaces the shoe in the radial direction of the main shaft. A shoe movable mechanism, wherein the shoe movable mechanism is configured to set a center line of the work piece so that a pressing force against the shoe is applied to the work piece when the outer peripheral surface of the work piece is ground. A first eccentricity with respect to the rotation center line of the spindle. And a second position in which the center line of the work piece is decentered with respect to the rotation center line of the main shaft so that a pressing force against the shoe is applied to the work piece when the inner peripheral surface of the work piece is ground. It shall be comprised so that it may switch to.

  According to this configuration, when the workpiece is supported on the shoe which is in the first position by the shoe moving mechanism, and this workpiece is sucked to the chucking surface of the chuck, the center line of the workpiece is separated from the rotation center line of the main shaft. It becomes an eccentric state. The eccentric direction at this time is a direction in which a pressing force against the shoe is applied to the workpiece when the outer peripheral surface of the workpiece is ground. For this reason, when the main shaft is rotated and the outer peripheral surface of the workpiece is ground by the outer peripheral grinding wheel, the workpiece is stably supported by the shoe.

  Further, when grinding the inner peripheral surface, the rotation direction of the main shaft is switched to a direction opposite to that during grinding of the outer peripheral surface by the main shaft driving unit. In this case, the position of the shoe is switched from the first position to the second position by the shoe moving mechanism. Then, the eccentric direction of the center line of the workpiece with respect to the rotation center line of the main shaft is a direction in which a pressing force against the shoe is applied to the workpiece when the inner peripheral surface of the workpiece is ground. Thereby, when grinding the internal peripheral surface of a workpiece with an internal peripheral surface grinding wheel, the workpiece is stably supported by the shoe.

  Thus, by providing the shoe moving mechanism, the eccentric direction of the center line of the workpiece with respect to the rotation center line of the spindle is ground and the outer peripheral surface of the workpiece is ground without swinging the headstock as in the conventional structure. It becomes possible to change so as to correspond to the case where the inner peripheral surface is ground and the case where the inner peripheral surface is ground, and the outer peripheral surface and the inner peripheral surface can be ground continuously.

  In a second invention, in the first invention, the shoe movable mechanism includes a shoe support member that supports the shoe, and a guide portion that guides the shoe support member in a direction orthogonal to the rotation center line of the main shaft. The configuration is as follows.

  According to a third aspect, in the first aspect, the shoe movable mechanism includes a shoe support member that supports the shoe, and a rotation shaft that extends parallel to the rotation center line of the main shaft and supports the shoe support member. The configuration is as follows.

  According to the first invention, the position of the shoe is switched by the shoe moving mechanism, so that the outer peripheral surface of the workpiece is ground and the inner peripheral surface is ground so as to correspond to the rotation center line of the main shaft. The eccentric direction of the center line of the workpiece can be changed. Thus, since the shoe is moved without moving the headstock, the chucking surface mounted on the main shaft is not displaced, and the machining accuracy of the workpiece can be improved. In addition, since the shoe is smaller and lighter than the headstock, it is possible to move the shoe with high accuracy while reducing the cost of the shoe moving mechanism, thereby reducing the price of a grinding machine with high machining accuracy. Can be obtained at

  According to the second invention, since the shoe support member is guided by the guide portion, the eccentric direction of the workpiece can be easily switched.

  According to the third invention, since the shoe support member is rotated around the rotation axis, the eccentric direction of the workpiece can be easily switched.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

Embodiment 1 of the Invention
FIG. 1 shows a grinding apparatus 1 according to Embodiment 1 of the present invention. The grinding device 1 is a shoe type centerless grinding device, and is configured to continuously grind the outer peripheral surface and the inner peripheral surface of the annular workpiece W.

  The grinding device 1 includes a main shaft 2, a main spindle 3 that supports the main shaft 2, a drive device 4 that rotationally drives the main shaft 2, an electromagnetic chuck 5, and a first that supports the outer peripheral surface of the workpiece W from the side. A shoe 7 (shown in FIG. 2), a second shoe 8 that supports the outer peripheral surface of the workpiece W from below, a shoe movable mechanism 10, an outer peripheral grinding wheel 11 (shown in FIG. 2 (a)), A circumferential grinding wheel 12 (shown in FIG. 2B) is provided.

  The spindle 2 is supported by a spindle stock 3 via a bearing (not shown) in a state where the rotation center line X (shown in FIG. 2) extends horizontally. The drive device 4 includes a motor and a speed reducer (both not shown), and the main shaft 2 is rotated in the counterclockwise direction in FIG. 2 (the direction indicated by the arrow A in FIG. 2A). It is configured to be switched and driven in the clockwise reverse direction (the direction indicated by the arrow B in FIG. 2B).

  As shown in FIG. 1, the electromagnetic chuck 5 is attached to the tip of the main shaft 2. The electromagnetic chuck 5 is configured to adsorb and support one end surface in the center line direction of the workpiece W, and includes an electromagnetic coil (not shown), a tubular main body portion 5a that accommodates the electromagnetic coil, and a main body portion. And a backing plate 5b disposed on the end face of 5a. Although not shown, the electromagnetic coil is connected to a power supply device via wiring, and current is supplied from the power supply device to the electromagnetic coil.

  The backing plate 5b is formed by forming a magnetic metal material in an annular shape, and is fixed to the main body 5a. The front end surface of the backing plate 5b is a suction surface 5c that sucks the workpiece W. The suction surface 5 c is configured by a surface extending perpendicular to the rotation center line X of the main shaft 2. When a current is supplied to the electromagnetic coil, the backing plate 5b is magnetized, and one end surface of the workpiece W is attracted to the attracting surface 5c. The magnitude of the magnetic force of the electromagnetic coil is such that the workpiece W adsorbed on the adsorption surface 5c of the backing plate 5b can slide in the radial direction of the backing plate 5b, and the rotational force of the spindle 2 is the workpiece W It is set to be transmitted to.

  As shown in FIG. 2, the shoe movable mechanism 10 includes a shoe holding member 15, a base member 16, a rotating shaft 17 that rotatably supports the shoe holding member 15 on the base member 16, and a shoe holding member 15. And a plurality of clamp mechanisms 18 for clamping the base member 16 to the base member 16. The shoe holding member 15 includes a lateral support portion 15a that extends in the vertical direction on the right side of the workpiece W (right side in FIG. 2), and a leftward direction (in FIG. 2) from the lower end of the lateral support portion 15a below the workpiece W. And a lower support portion 15b extending to the left side. A base end portion of the first shoe 7 is attached to an intermediate portion in the vertical direction of the side support portion 15a by a pin 19 extending in the rotation center line X direction of the main shaft 2. The base end portion of the second shoe 8 is attached to the vicinity of the left end portion of the lower support portion 15b by a pin 20 extending in the direction of the rotation center line X of the main shaft 2. The first shoe 7 and the second shoe 8 rotate around the pins 19 and 20. The sliding surfaces 7 a and 8 a of the first shoe 7 and the second shoe 8 are formed along the outer peripheral surface of the workpiece W.

  The base member 16 is fixed to the headstock 3, and includes a side portion 16a extending along the side support portion 15a of the shoe holding member 15 and a lower side portion 16b extending along the lower support portion 15b. Have. The rotating shaft 17 is attached in the vicinity of the boundary portion between the side portion 16 a and the lower side portion 16 b of the base member 16 so as to extend in the rotation center line X direction of the main shaft 2. The rotation shaft 17 is rotatably inserted into an insertion hole (not shown) formed in the vicinity of the boundary portion between the side support portion 15a and the lower support portion 15b of the shoe holding member 15. Therefore, the shoe holding member 15 rotates about the rotation shaft 17 with respect to the base member 16.

  A rotation actuator 23 for rotating the shoe holding member 15 around the rotation shaft 17 is disposed at the upper end of the side portion 16a of the base member 16. The turning actuator 23 is constituted by a well-known hydraulic cylinder, the cylinder portion is fixed to the base member 16, and the tip of the rod is connected to the upper end of the shoe holding member 15. The shoe holding member 15 is rotated by the expansion / contraction operation of the rotation actuator 23.

  In the vicinity of the left end portion of the lower side portion 16b of the base member 16, two rotational position setting portions 24, 24 that are spaced apart in the vertical direction are provided. These rotation position setting sections 24 and 24 serve as stoppers for setting a stop position when the shoe holding member 15 is rotated. That is, the lower support portion 15b of the shoe holding member 15 is provided with a projecting portion 15c so as to project to the left side. When the shoe holding member 15 is rotated until the protruding portion 15c comes into contact with the lower rotation position setting portion 24, the position of the shoes 7 and 8 is the outer peripheral surface grinding for grinding the outer peripheral surface of the workpiece W. Position (shown in FIG. 2 (a)). 2 indicates the center line of the workpiece W.

  On the other hand, as shown in FIG. 2B, when the shoe holding member 15 is rotated until the protruding portion 15c of the shoe holding member 15 comes into contact with the upper rotation position setting portion 24, the positions of the shoes 7 and 8 are reached. However, this is a position for grinding the inner peripheral surface of the workpiece W. The positions of the shoes 7 and 8 set by the rotation position setting units 24 and 24 can be adjusted by the size of the workpiece W, the grinding allowance, and the like.

  As shown in FIG. 2A, at the position for grinding the outer peripheral surface, the center line Y of the workpiece W is below the rotation center line X of the main shaft 2 and eccentric to the side close to the second shoe 8 ( Offset). Further, as shown in FIG. 2B, the center line Y of the workpiece W is offset above the rotation center line X of the main shaft 2 and closer to the first shoe 7 at the position for inner peripheral surface grinding. is doing. That is, by simply rotating the shoe holding member 15, the shoes 7 and 8 move in the radial direction of the main shaft 2 so that the eccentric direction of the center line Y of the workpiece W with respect to the rotation center line X of the main shaft 2 is switched. It has become.

  The clamp mechanism 18 has a well-known structure that fixes the shoe holding member 15 to the base member 16 by using a frictional force generated by pressing the shoe holding member 15 against the base member 16. . The clamp mechanism 18 includes, for example, a disc spring that urges the shoe holding member 15 in a direction in which the shoe holding member 15 is pressed against the base member 16, and a hydraulic cylinder that prevents the urging force of the disc spring from acting on the shoe holding member 15. A hydraulic clamp can be used. When the shoes 7 and 8 are in the position for grinding the outer peripheral surface, the shoe holding member 15 is fixed by holding the clamp mechanism 18 in a clamped state, and the positions of the shoes 7 and 8 are held at the positions for grinding the outer peripheral surface. Is done. Similarly, when the shoes 7 and 8 are in the inner peripheral surface grinding position, the clamp mechanism 18 is brought into a clamping state, whereby the positions of the shoes 7 and 8 are held at the inner peripheral surface grinding position.

  The outer peripheral grinding wheel 11 is arranged such that its rotation center line is parallel to the rotation center line X of the main shaft 2 and is located outside the workpiece W at the same height position. The outer peripheral grinding wheel 11 is rotationally driven in a direction indicated by an arrow C in FIG. 2 (a direction opposite to the normal rotation direction A of the main shaft 2) by a driving device (not shown). Further, the inner peripheral surface grinding wheel 12 is arranged so that its rotation center line is parallel to the rotation center line X of the main shaft 2 and is located inside the workpiece W at the same height position. The inner peripheral grinding wheel 12 is driven to rotate in the same direction as the outer peripheral grinding wheel 11 (the direction indicated by the arrow D in FIG. 2B) by a driving device (not shown). Further, the outer peripheral surface grinding wheel 11 and the inner peripheral surface grinding wheel 12 are supported by a movable mechanism (not shown) and are moved in a direction in which they are in contact with and separated from the workpiece W.

  Next, a procedure for grinding the workpiece W using the grinding apparatus 1 configured as described above will be described. First, the case of grinding the outer peripheral surface of the workpiece W will be described. After the clamp mechanism 18 is unclamped and the shoe holding member 15 is free, the turning actuator 23 is operated to rotate the shoe holding member 15. As shown in FIG. 2 (a), the shoes 7 and 8 are moved to the position for grinding the outer peripheral surface. Then, the shoe holding member 15 is fixed to the base member 16 with the clamp mechanism 18 in a clamped state.

  In this state, the workpiece W is supported by the first shoe 7 and the second shoe 8 and is attracted to the attracting surface 5 c of the electromagnetic chuck 5. Then, by rotating the main shaft 2 in the direction of arrow A, the workpiece W rotates in the same direction while sliding on the sliding surfaces 7a and 8a of the first shoe 7 and the second shoe 8. At this time, the center line Y of the workpiece W and the rotation center line X of the main shaft 2 are decentered as described above. However, since the workpiece W is only attracted to the attracting surface 5a of the electromagnetic chuck 5, the attracting surface 5a. In contrast, it moves so as to slide in the radial direction and does not leave the shoes 7 and 8.

  Then, the outer peripheral grinding wheel 11 is moved by the movable mechanism while being rotated in the direction of the arrow C by the driving device, and is brought into contact with the outer peripheral surface of the workpiece W. Thereby, the outer peripheral surface of the workpiece W is down-ground over the entire circumference. At this time, the positions of the shoes 7 and 8 are positions for grinding the outer peripheral surface, that is, the center line Y of the workpiece W is below the rotation center line X of the main shaft 2 and is closer to the side closer to the second shoe 8. Because of this, pressing force against the shoes 7 and 8 acts on the workpiece W. Thereby, it is possible to grind the workpiece W stably.

  On the other hand, the case where the inner peripheral surface of the workpiece W is ground will be described. The clamp mechanism 18 is unclamped while the workpiece W is held by the shoes 7, 8, and then the turning actuator 23 is operated to operate the shoe. The holding member 15 is rotated around the rotation shaft 17 so that the shoes 7 and 8 are brought into positions for inner peripheral surface grinding as shown in FIG. Then, the shoe holding member 15 is fixed to the base member 16 with the clamp mechanism 18 in a clamped state.

  In this state, the workpiece W supported by the first shoe 7 and the second shoe 8 is attracted to the attracting surface 5c of the electromagnetic chuck 5, and the workpiece W is rotated by rotating the spindle 2 in the direction of arrow B. . Then, the inner peripheral grinding wheel 12 is moved by the movable mechanism while being rotated by the driving device, and is brought into contact with the inner peripheral surface of the workpiece W. Thereby, the inner peripheral surface of the workpiece W is down-ground over the entire circumference. At this time, the positions of the shoes 7 and 8 are the positions for inner peripheral surface grinding, that is, the center line Y of the workpiece W is above the rotation center line X of the main shaft 2 and closer to the first shoe 7. Since it is eccentric, a pressing force against the shoes 7 and 8 acts on the workpiece W. Thereby, it is possible to grind the workpiece W stably.

  That is, the shoe movable mechanism 10 determines the position of the shoes 7 and 8 so that the pressing force against the shoes 7 and 8 acts on the work W when the outer peripheral surface of the work W is ground. And the center line Y of the workpiece W so that the pressing force against the shoes 7 and 8 is applied to the workpiece W during grinding of the inner peripheral surface of the workpiece W. It is configured to switch to a position to be decentered from the second rotation center line X.

  As described above, according to the grinding apparatus 1 according to the first embodiment, the positions of the first shoe 7 and the second shoe 8 are switched by the shoe movable mechanism 10, so that the outer peripheral surface of the workpiece W is ground. The center line of the workpiece W can be decentered with respect to the rotation center line of the main shaft 2 so as to correspond to the case where the inner peripheral surface is ground. Thus, since the shoes 7 and 8 are moved without moving the headstock 3, the attracting surface 5a of the electromagnetic chuck 5 mounted on the spindle 2 is not displaced, and the workpiece W is processed. Accuracy can be improved. Further, since the first shoe 7 and the second shoe 8 are smaller and lighter than the headstock 3, these shoes 7 and 8 can be moved with high accuracy at low cost and have high machining accuracy. The grinding device 1 can be obtained at a low price.

  Further, the eccentric direction of the workpiece W can be easily switched by displacing the shoes 7 and 8 in the radial direction of the main shaft 2 only by rotating the shoe support member 15 around the rotation shaft 17.

<< Embodiment 2 of the Invention >>
FIG. 3 shows a grinding apparatus 1 according to Embodiment 2 of the present invention. The grinding apparatus 1 according to the second embodiment is different from that according to the first embodiment in that the positions of the first shoe 7 and the second shoe 8 are switched by sliding the shoe holding member 15. Since these parts are the same, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different parts will be described in detail.

  That is, the base member 16 is provided with a slide rail 40 (guide portion) extending in an oblique direction. The extending direction of the slide rail 40 is a direction that forms an inclination angle of 45 ° with respect to the horizontal plane in a direction orthogonal to the rotation center line X of the main shaft 2. A slide actuator 41 is disposed on the upper portion of the base member 16. The slide actuator 41 is composed of a well-known hydraulic cylinder. The rod is arranged along the direction in which the slide rail 40 extends, and the cylinder portion is fixed to the base member 16. The tip of the rod is connected to the shoe holding member 15.

  The shoe holding member 15 has a groove 15d in which the slide rail 40 can slide. In a state where the slide rail 40 is fitted in the groove 15d, the shoe holding member 15 is guided by the slide rail 40 and slides. Accordingly, the operation of the slide actuator 41 causes the shoe holding member 15 to move in a direction inclined by 45 ° with respect to the horizontal plane.

  An upper end position setting unit 44 is provided at the upper part of the base member 16, and a lower end position setting unit 45 is provided at the lower part. When the shoe holding member 15 is moved until the shoe holding member 15 contacts the lower end position setting portion 45, the positions of the shoes 7 and 8 grind the outer peripheral surface of the workpiece W as shown in FIG. This is the position for grinding the outer peripheral surface. On the other hand, when the shoe holding member 15 is moved until the shoe holding member 15 comes into contact with the upper end position setting portion 44, the positions of the shoes 7 and 8 are changed to the inner periphery of the workpiece W as shown in FIG. It becomes the position for internal peripheral surface grinding which grinds the surface. The position for outer peripheral surface grinding and the position for inner peripheral surface grinding are the same as in the first embodiment.

  Next, a procedure for grinding the workpiece W using the grinding apparatus 1 configured as described above will be described. First, the case where the outer peripheral surface of the workpiece W is ground will be described. After the clamp mechanism 18 is in an unclamped state, the sliding actuator 41 is operated to raise the shoe holding member 15 so that the shoes 7 and 8 are moved to the outer peripheral surface. Set to grinding position. Then, the shoe holding member 15 is clamped to the base member 16 by the clamp mechanism 18. When the main shaft 2 is rotated in the direction of arrow A in this state, the outer peripheral surface of the workpiece W is down-ground over the entire circumference as in the first embodiment.

  On the other hand, the case where the inner peripheral surface of the workpiece W is ground will be described. The clamp mechanism 18 is brought into an unclamped state while the workpiece W is held by the shoes 7, 8, and then the slide actuator 41 is operated to operate the shoe. The holding member 15 is lowered to bring the shoes 7, 8 to the position for grinding the inner peripheral surface. Then, the shoe holding member 15 is clamped to the base member 16 by the clamp mechanism 18. When the main shaft 2 is rotated in the arrow B direction in this state, the inner peripheral surface of the workpiece W is down-ground over the entire circumference.

  As described above, according to the grinding device 1 according to the second embodiment, as with the first embodiment, the grinding device 1 having high processing accuracy can be obtained at a low price.

  Further, by simply sliding the shoe support member 15 along the slide rail 40, the eccentric direction of the workpiece W can be easily switched by displacing the shoes 7, 8 in the radial direction of the main shaft 2.

  In the first and second embodiments, the inner peripheral surface is ground after grinding the outer peripheral surface of the workpiece W. However, the present invention is not limited thereto, and after grinding the inner peripheral surface of the workpiece W, The outer peripheral surface may be ground.

  In the first and second embodiments, the present invention is applied to a horizontal grinder. However, the present invention may be applied to a vertical grinder. In the first and second embodiments, the actuator for rotating or sliding the shoe holding member 15 is a hydraulic cylinder. However, the present invention is not limited thereto, and the shoe holding member 15 is controlled by NC using a servo motor and a ball screw. The position setting section 24 or 44, 45 that regulates the position of the shoe holding member 15 may be omitted.

  As described above, the grinding apparatus according to the present invention can be used when grinding the inner and outer peripheral surfaces of an annular workpiece.

It is a side view of the grinding device concerning Embodiment 1 of the present invention. FIG. 2 is a view of the grinding apparatus according to Embodiment 1 as viewed from the workpiece side along the center line, where (a) shows a state in which the shoe is in a position for grinding the outer peripheral surface, and (b) The state in the position for circumferential grinding is shown. FIG. 3 is a view corresponding to FIG. 2 according to the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grinding device 2 Spindle 3 Spindle base 4 Drive unit (spindle drive unit)
5 Electromagnetic chuck 5c Suction surface 7 First shoe 8 Second shoe 10 Shoe movable mechanism 11 Outer surface grinding wheel 12 Inner surface grinding wheel 17 Rotating shaft 40 Slide rail (guide section)
X Centerline of spindle Y Centerline of workpiece

Claims (3)

In a grinding apparatus for grinding an outer peripheral surface and an inner peripheral surface of an annular workpiece,
The spindle,
A spindle drive unit that switches the spindle to forward and reverse rotation, and
A chuck that is attached to the spindle and has a suction surface that sucks one end surface in the center line direction of the workpiece;
A shoe for supporting the outer peripheral surface of the workpiece;
An outer peripheral grinding wheel that contacts the outer peripheral surface of the workpiece and grinds the outer peripheral surface;
An inner peripheral grinding wheel that contacts the inner peripheral surface of the workpiece and grinds the inner peripheral surface;
A shoe movable mechanism that supports the shoe and displaces the shoe in the radial direction of the main shaft;
The shoe moving mechanism is configured such that the center line of the workpiece is set to the rotation center line of the main shaft so that the position of the shoe causes the pressing force to the shoe to act on the workpiece when the outer peripheral surface of the workpiece is ground. A first position to be decentered, and a center line of the work piece is decentered with respect to a rotation center line of the main shaft so as to apply a pressing force to the shoe to the work piece when grinding the inner peripheral surface of the work piece. A grinding apparatus configured to switch to a second position to be performed. The grinding apparatus according to claim 1,
The shoe moving mechanism includes a shoe support member that supports the shoe, and a guide unit that guides the shoe support member in a direction orthogonal to the rotation center line of the main shaft. The grinding apparatus according to claim 1,
The shoe moving mechanism includes a shoe support member that supports the shoe, and a rotation shaft that extends in parallel with the rotation center line of the main shaft and pivotally supports the shoe support member.

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