KR101713202B1

KR101713202B1 - Grinding machine

Info

Publication number: KR101713202B1
Application number: KR1020100093324A
Authority: KR
Inventors: 노보루 와타나베; 히로아키 우노키
Original assignee: 가부시키가이샤 타이요코키
Priority date: 2009-09-29
Filing date: 2010-09-27
Publication date: 2017-03-07
Also published as: EP2319656B1; CN201833239U; TW201114547A; EP2319656A3; JP2011073082A; ES2574230T3; KR20110035919A; JP5416527B2; TWI434749B; EP2319656A2

Abstract

A rotary grindstone 4 for grinding an outer circumferential surface or an inner circumferential surface of a substantially cylindrical work W; a work table 3 supporting the work W so as to be rotatable and having a rotation axis in a vertical direction; W of the grinding machine 1 and the first and second shoes 5 and 6 for supporting the work W. The first and second shoes 5 and 6 are arranged in a horizontal plane A moving mechanism for moving the first shoe 5 in the X-axis direction and the Y-axis direction in the X-axis direction and the Y-axis direction in the first shoe 5, And a drive control section 20.

Description

{GRINDING MACHINE}

The present invention relates to a grinding machine for grinding an outer circumferential surface and an inner circumferential surface of a work requiring high roundness such as inner race and outer race of a bearing, for example.

A grinding machine of this type includes a rotary grindstone for grinding the outer circumferential surface or the inner circumferential surface of the work, a work table for supporting the work for rotatably driving, and a shoe for supporting the work in contact with the work For example, Japanese Patent Publication No. Hei 3-79151).

Japanese Patent Publication No. 3-79151

In this kind of grinding machine, since the position of the shoe arrangement greatly affects the finishing accuracy of the work, it is necessary to adjust the arrangement position of the shoe for each size of the work or for each process. For example, it is necessary to finely adjust the arrangement position of the shoe according to the diameter, height, and thickness of the work, and it is necessary to adjust the arrangement position of the shoe according to the process of grinding the outer diameter or inner diameter. Adjustment of the placement position of such shoe requires high proficiency and, as a result, it takes a great deal of time to adjust the placement position of the shoe, resulting in a problem of lowering productivity.

It is an object of the present invention to provide a grinding machine which does not require high proficiency in position adjustment of a shoe, can shorten preparation time for work grinding and can improve productivity.

The present invention relates to a rotary grindstone for grinding an outer circumferential surface or an inner circumferential surface of a substantially cylindrical workpiece (hereinafter referred to as a work), a work table for rotatably supporting the work and having a rotation axis in the vertical direction, In a grinding machine having a shoe for supporting the work,

A moving mechanism for moving the shoe in two axial directions in a horizontal plane and a drive control section for driving and controlling the moving mechanism such that the biaxial position of the shoe is at a predetermined position .

According to the present invention, there is provided the moving mechanism that makes the shoe movable in the biaxial direction in the horizontal plane and the driving control section that drives and controls the moving mechanism so that the biaxial position of the shoe becomes the predetermined position. It is possible to easily and reliably determine the position of the shoe without requiring adjustment by a conventional expert, and to improve the productivity, by controlling the biaxial position stored in the storage unit to be reproduced.

In a preferred embodiment of the present invention, the drive control unit drives and controls the moving mechanism so that the moving coordinate system of the shoe becomes an orthogonal coordinate system or a polar coordinate system.

According to the preferred embodiment, the moving mechanism can be driven and controlled so that the moving coordinate system of the shoe is either the orthogonal coordinate system or the polar coordinate system, so that optimum shoe position control according to the work condition and the like becomes possible.

In another preferred embodiment of the present invention, the drive control section has a storage section for storing the biaxial direction position of the shoe previously positioned, and drives and controls the movement mechanism so that the stored biaxial direction position is reproduced.

According to another preferred embodiment of the present invention, since the storage unit for storing the biaxial position of the shoe is provided, the optimum shoe position in accordance with the work condition or the like is obtained in advance by actual grinding or the like, And the position of the shoe can be easily and reliably determined by reproducing the stored biaxial position.

In another preferred embodiment of the present invention, the drive control section has a storage section for storing the biaxial position of the shoe according to the machining condition information, and the two-axis direction position called from the storage section according to the machining condition information is The moving mechanism is controlled so as to be reproduced.

According to another preferred embodiment of the present invention, since the biaxial position of the shoe in accordance with the machining condition information is stored, it is possible to reproduce the position in the biaxial direction in accordance with the machining condition information, It becomes.

In another preferred embodiment of the present invention, the drive control section drives and controls the moving mechanism so as to move following the change in the diameter of the sugar work.

According to still another preferred embodiment of the present invention, the drive control unit drives and controls the moving mechanism so as to move following the diameter change of the sugar work, so that even when the amount of grinding is increased, an optimum shoe position can be ensured, .

In another preferred embodiment of the present invention, the drive control section drives and controls the moving mechanism such that the pressure applied to the sugar work becomes a predetermined pressure.

According to another preferred embodiment of the present invention, the drive control unit drives and controls the moving mechanism so that the pushing force applied to the sugar work is a predetermined pressure, so that the driving control unit can control the pushing force according to the rigidity of the work. .

In another preferred embodiment of the present invention, the moving mechanism is arranged so as to be movable in the X-axis direction parallel to the cutting (cutting) direction of the rotary grindstone and in the Y-axis direction orthogonal to the X-axis, A first moving mechanism including a fixed first moving table, a ball screw for moving the first moving table, and a servo motor for rotationally driving the ball screw, and a second moving mechanism including a first moving mechanism arranged to be movable in the X- And a second moving mechanism including a second moving table on which the second shoe is fixed, a ball screw for moving the second moving table, and a servo motor for rotationally driving the ball screw.

According to another preferred embodiment of the present invention, the first moving mechanism fixes the first shoe to the first moving table that moves the moving mechanism in the X-axis direction and the Y-axis direction, and the first moving mechanism moves the X- And the second moving mechanism that fixes the second shoe on the second moving table. Therefore, it is possible to realize the movement of the first shoe in the X-axis and Y-axis directions and the movement of the second shoe in the X- and Y- And the like.

1 is a plan view of a grinding machine according to a first embodiment of the present invention.
2 is a partial cross-sectional front view of the grinding machine.
Fig. 3 is an explanatory diagram of the outer diameter grinding and the inner diameter grinding by the grinding machine.
4 is a plan view for explaining a shoe position at the time of grinding the outer periphery by the grinding machine.
Fig. 5 is a plan view for explaining the shoe position at the time of the inner diameter grinding by the grinding machine.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In the drawing, reference numeral 1 denotes a vertical grinding machine, which grinds the outer peripheral surface Wo and the inner peripheral surface Wi of a cylindrical workpiece W such as an outer race or an inner race of a bearing. This type of grinding machine 1 includes a work table 3 mounted on a bed 2 so as to be rotatably driven with its rotary shaft A oriented in the vertical direction and a work table 3 for grinding the outer peripheral surface Wo of the work W A rotary grindstone 4 and a first shoe 5 and a second shoe 6 which come into contact with the work W and support the work W in the radial direction.

The work table 3 is attached to an upper end portion of a work main shaft (not shown), and is rotationally driven by the work main shaft in the counterclockwise direction in FIG. On the work table 3, an electronic chuck 7 is fixed.

The work W is mounted on the electronic chuck 7 so as to be coaxial with the rotation axis A of the work table 3 via a work rest 8 7). Therefore, the work W rotates together with the work main shaft.

The rotary grindstone 4 is arranged such that the rotary shaft B thereof is parallel to the rotary axis A of the work main shaft and is fixed to the lower end surface of the grindstone drive shaft 9. The rotary grindstone 4 is rotationally driven in the clockwise direction (arrow b direction) in Fig. Further, as shown in Fig. 3, the outer grinding and the inner grinding can be performed by using the rotary grindstone 4. Fig.

In the first embodiment, the first shoe 5 is disposed at a position shifted from the opposite position of the rotational axis B of the rotary grindstone 4 to the upstream side in the rotational direction by interposing the rotary shaft A, The second shoe 6 is disposed on the upstream side in the rotational direction perpendicular to the straight line C connecting the rotational shafts A and B.

The grinding machine 1 of the first embodiment includes a moving mechanism for moving the first and second shoes 5 and 6 in the X axis direction and the Y axis direction, 5) in the X-axis direction and the Y-axis direction, and a second moving mechanism (11) for moving the second shoe (6) in the X-axis direction and the Y-axis direction have.

The first moving mechanism 10 is disposed movably in the X-axis direction parallel to the infeed direction of the rotary grindstone 4 and has a first slide table 12 And a first drive table 13 on which the first slide table 12 is mounted and which moves the first slide table 12 in the Y axis direction orthogonal to the X axis.

The first drive table 13 includes a support member 13a fixed on the bed 2 and a support member 13b supported on the support member 13a via a slide rail 13b so as to be movable in the Y- And a drive table main body 13c.

A first Y-axis ball screw 13e connected to the output shaft of the first Y-axis motor 13d, and a first Y-axis ball screw 13e connected to the output shaft of the first Y-axis motor 13d are provided in the concave portion 13a ' And a first Y-axis nut 13f that is screwed to the first Y-axis nut 13e.

The first Y-axis motor 13d is fixed to the recess 13a ', the Y-axis ball screw 13e is supported on the recess 13a' through a bearing, and the first Y The shaft nut 13f is fixed to the drive table main body 13c.

The first slide table 12 includes a support member 12a fixed on a drive table main body 13c of the first drive table 13 and a support member 12b on the support member 12a via a slide rail, And a slide table body 12c movably supported.

A first X-axis ball screw 12e connected to the output shaft of the first X-axis motor 12d, and a first X-axis ball screw 12e connected to the output shaft of the first X-axis ball screw 12e are provided in the concave portion 12a 'of the support member 12a. A first X-axis nut 12f which is screwed to the first X-axis nut 12e.

The first X-axis motor 12d is fixed to the recess 12a ', the X-axis ball screw 12e is supported on the recess 12a' through a bearing, and the first X The shaft nut 12f is fixed to the slide table main body 12c.

12g, 12h and 13g, 13h are telescopic slide covers for preventing grinding dust from being caught in the ball screw or the like.

When the first Y-axis motor 13d rotates the first Y-axis ball screw 13e, the drive table main body 13c moves the entire first slide table 12 in the Y-axis direction, The first shoe 5 moves in the Y-axis direction.

On the other hand, when the first X-axis motor 12d rotates and drives the first X-axis ball screw 12e, the slide table body 12c moves in the X-axis direction, and the first shoe 5 ) Moves in the X-axis direction.

The second moving mechanism (11) has a structure similar to that of the first moving mechanism (10). That is, the second moving mechanism 11 includes a second slide table 14 which is disposed movably in the Y-axis direction and on which the second shoe 6 is fixed, and a second slide table 14 And a second drive table 15 on which the second slide table 14 is mounted and which moves the second slide table 14 in the X-axis direction.

The second drive table 15 includes a drive table main body 15c arranged to be movable relative to the bed 2 in the X axis direction and a drive table main body 15b for driving the drive table main body 15c in the X axis direction 2 X-axis motor 15d, a second X-axis ball screw 15e, and a second X-axis nut 15f.

The second slide table 14 includes a slide table main body 14c arranged on the drive table main body 15c and arranged to be movable relative to the drive table main body 15c in the Y axis direction, A second Y-axis motor 14d, a second Y-axis ball screw (not shown), and a second Y-axis nut.

Reference numerals 14g, 14h, 15g and 15h are telescopic slide covers for preventing grinding dust from being applied to the ball screw or the like.

When the second X-axis motor 15d rotates the second X-axis ball screw 15e, the drive table main body 15c moves the entire second slide table 14 in the X-axis direction, The second shoe 6 moves in the X-axis direction.

On the other hand, when the second Y-axis motor 14d rotates and drives the second Y-axis ball screw, the slide table body 14c moves in the Y-axis direction, And moves in the axial direction.

The grinding machine 1 according to the first embodiment has the first moving mechanism 10 and the second moving mechanism 10 so that the positions of the first shoe 5 and the second shoe 6 in the X- And a drive control section (20) for driving and controlling the second moving mechanism (11). The drive control section 20 has a storage section 21 for storing the positions of the first and second shoes 5 and 6 set in advance in the X-axis and Y-axis directions. The drive control unit 20 reproduces the positions of the first and second shoes 5 and 6 in the X-axis and Y-axis directions from the storage unit 21 in accordance with the work information, And drives and controls the various motors of the first and second moving mechanisms (10, 11).

The drive control unit 20 drives and controls the first and second moving mechanisms 10 and 11 so that the first and second shoes 5 and 6 move following the diameter of the workpiece, Further, the first and second moving mechanisms (10, 11) are driven and controlled so that the pressing force applied to the work by the shoes (5, 6) becomes a predetermined pressure.

Here, the X-axis and Y-axis direction positions of the first shoe 5 and the second shoe 6 stored in the storage unit 21 are obtained as follows.

For example, an optimum X-axis and Y-axis position in order to ensure machining accuracy such as roundness that can satisfy requirements for each work condition such as diameter, height, thickness, And the grinding process is performed while finely adjusting the position. In this case, the positions in the X-axis and Y-axis directions are found for each machining condition such as the infeed amount of the rotary grindstone 4, the pressing force, the outer diameter grinding, and the inner diameter grinding, and stored as data to be stored in the storage section 21.

In the first embodiment, the drive control section 20 instructs the positions of the first and second shoes 5 and 6 in an orthogonal coordinate system having the rotation axis A of the work main axis as the origin. For example, the position of the first shoe 5 in the X-axis and Y-axis directions is (x1, y1) and the position of the second shoe 6 in the X-axis and Y- .

Further, the positions of the first and second shoe (5, 6) may be instructed to a polar coordinate system with the rotation axis (A) of the work main shaft as the origin. For example, the first shoe 5 = (r1,? 1) and the second shoe 6 = (r2,? 2).

In the grinding machine 1 according to the first embodiment, the work W is fixed on the electronic chuck 7 via the work rest 8 and is rotationally driven in the direction of arrow a by the work main shaft, 4) is driven to rotate in the direction of the arrow b at a rotational speed higher than that of the work W. At this time, the drive control section 20 controls the first moving mechanism 10 and the second moving mechanism 10 so that the X-axis direction and the Y-axis direction position of the first and second shoes 5 and 6 read out from the storage section 21 are reproduced. 2 moving mechanism 11 in accordance with the rotation of the motor.

As described above, in the first embodiment, the first moving mechanism 10 and the second moving mechanism 11 for moving the first shoe 5 and the second shoe 6 in the horizontal plane in the X-axis direction and the Y- And the driving mechanisms 10 and 11 are driven and controlled such that the positions of the first and second shoe 5 and 6 stored in the storage section 21 in the X axis direction and the Y axis direction are reproduced, The position of the shoe can be controlled to an ideal position easily and reliably without requiring adjustment by a conventional expert, and productivity can be improved.

Further, since the storage section 21 for storing the positions of the first and second shoes 5 and 6 in the X-axis direction and the Y-axis direction is provided, the optimum shoe position according to the work conditions and the like is set to the actual grinding process And stores it in the storage section 21 and reproduces the stored positions in the X-axis and Y-axis directions, whereby the shoe can be positioned easily and reliably.

Since the two-axis direction positions of the first shoe 5 and the second shoe 6 according to the machining condition information are stored in the storage unit 21, it is possible to reproduce the positions in the biaxial direction according to the machining condition information , Shoe position control with higher accuracy becomes possible.

The drive control unit 20 drives and controls the first and second moving mechanisms 10 and 11 so that the first and second shoes 5 and 6 move following the diameter of the work W Therefore, even when the amount of grinding is increased, an optimum shoe position can be secured and the grinding precision can be increased.

The drive control section 20 controls the first and second moving mechanisms 10 and 11 so that the pressing force applied to the work W by the first and second shoes 5 and 6 becomes a predetermined pressure, Therefore, it is possible to control the pressing force in accordance with the rigidity of the work W, and the grinding accuracy can be improved also in this respect.

In the conventional grinding machine, in the case of performing the outer diameter grinding and the inner diameter grinding, in each of the four steps of outer diameter roughing processing (t1), inner diameter roughing processing (t2), outer diameter finishing processing (t3), and inner diameter finishing processing It was necessary to prepare. On the other hand, in this embodiment, since the position adjustment of the first and second shoes 5 and 6 can be automatically performed, the four steps (t1 to t4) are continuously It is possible to improve the productivity.

1, the first shoe 5 is set slightly upstream of the straight line C in the rotational direction, and the second shoe 6 is moved from the straight line C The optimum position of the first shoe 6 in the present invention is not limited to the position shown in Fig. 1, It may be set further upstream. In the case of the inner diameter grinding, as shown in Fig. 5, the first shoe 5 may be disposed at a position facing the rotating grindstone 4 '.

In the above embodiment, the case of moving both the first and second shoes 5 and 6 has been described. However, either one of the shoe may be fixedly arranged, and the position of only the other shoe may be adjusted.

In the above embodiment, 12 g, 12 h, 13 g, 13 h, 14 g, 14 h, 15 g and 15 h are described as telescopic slide covers, but a part thereof may be a fixed type sheet metal cover.

Claims

A rotary grindstone for grinding an outer circumferential surface or an inner circumferential surface of a cylindrical workpiece (hereinafter referred to as a work); a work table supporting the work so as to be rotatable and having a rotation axis in the vertical direction; In a grinding machine having first and second shoes for supporting,
A moving mechanism for moving the first and second shoe in two axial directions in a horizontal plane,
And a drive control section that drives and controls the moving mechanism such that the biaxial position of the first and second shoe becomes a predetermined position,
Wherein the moving mechanism is arranged so as to be movable in an X-axis direction parallel to a cutting-in direction of the rotary grindstone and a Y-axis direction orthogonal to the X-axis, the first moving table including a first moving table Wow,
And a second moving mechanism which is arranged movably in the X-axis and Y-axis directions and includes a second moving table on which a second shoe is fixed.

The method according to claim 1,
Wherein the drive control unit drives and controls the moving mechanism so that the moving coordinate system of the first and second shoe becomes an orthogonal coordinate system or a polar coordinate system.

3. The method of claim 2,
Wherein the drive control section has a storage section for storing biaxial direction positions of the first and second shoe which are previously positioned, and drives and controls the moving mechanism so that the stored biaxial direction positions are reproduced.

3. The method of claim 2,
Wherein the drive control unit has a storage unit for storing biaxial positions of the first and second shoe in accordance with the machining condition information so that the biaxial direction positions recalled from the storage unit in accordance with the machining condition information are reproduced, Is controlled to be driven.

5. The method of claim 4,
Wherein the drive control unit drives and controls the moving mechanism so as to move following the change in the diameter of the first and second work pieces.

5. The method of claim 4,
Wherein the drive control unit drives and controls the moving mechanism so that the pressing force applied to the first and second work pieces becomes a predetermined pressure.

The method according to claim 1,
Wherein the first moving mechanism includes a ball screw for moving the first moving table and a servo motor for rotationally driving the ball screw,
Wherein the second moving mechanism includes a ball screw for moving the second moving table and a servo motor for rotating the ball screw.