JP2018134716A - Polishing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit noise occurring in output of a sensor.SOLUTION: A polishing device 1 includes: a motor 20; a polishing part 10 which is rotationally driven by the motor 20; a support part 30 supporting a body 21 of the motor 20; a block part 63 (a holding member) in which the support part 30 is attached at a position separated from the polishing part 10; and a sensor 90 which is separated from an attachment position of the support part 30 and the block part 63, sandwiched by the support part 30 and the block part 63, and can measure one of a tensile load in a rotation axis direction and a compression load in the rotation axis direction.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a polishing apparatus provided with a polishing unit that is rotationally driven by a motor.

  Conventionally, a polishing apparatus for polishing an inner peripheral surface of a pipe member has been widely used. For example, Patent Document 1 describes a polishing apparatus including a casing. A motor is provided at one end of the housing. A polishing part (grinding body) is provided at the other end of the housing. The part located between a motor and a grinding | polishing part among housings is pivotally supported by a bearing.

  The polishing unit is pressed against a lower portion of the inner peripheral surface of the cylindrical workpiece. The inner peripheral surface of the workpiece is polished by rotating the housing and the polishing unit by the motor. A load cell is arranged below the bearing. Depending on the output of the load sensor, the load that presses the polishing portion against the inner peripheral surface of the workpiece is controlled.

Japanese Patent Publication No. 7-98301

  In the polishing apparatus described in Patent Document 1, the casing is rotated by the motor, and the vibration of the motor is easily transmitted to the casing. When an apparatus (hereinafter collectively referred to as a sensor) that measures a load and outputs a measurement value, such as a load cell, is arranged as in Patent Document 1, vibration is transmitted to the sensor via a bearing, and the output of the sensor There was a risk of noise being generated.

  In view of such a problem, an object of the present disclosure is to provide a polishing apparatus capable of suppressing noise generated in the output of a sensor.

  In order to solve the above-described problem, a polishing apparatus according to one embodiment of the present disclosure includes a motor, a polishing unit that is rotationally driven by the motor, a support unit that supports a main body of the motor, and a distance from the polishing unit in the rotation axis direction. The holding member to which the support portion is attached and the attachment position of the support portion and the holding member are spaced apart from each other and sandwiched between the support portion and the holding member. A sensor capable of measuring one of the compressive loads in the direction.

  The support portion includes an extending portion that extends along the rotation axis direction, and an attachment member that is provided in the extending portion and extends in a direction perpendicular to the rotation axis direction and attached to the holding member, and the sensor holds It may be clamped between the member and the mounting member.

  You may provide the 1st movable part which moves a support part to the direction perpendicular | vertical to a rotating shaft direction.

  You may provide the 2nd movable part which moves a support part to a rotating shaft direction.

  According to the present disclosure, it is possible to suppress noise generated in the output of the sensor.

It is a figure which shows the whole structure of a grinding | polishing apparatus. FIG. 2A is an extraction diagram in the vicinity of a sensor of the polishing apparatus according to the embodiment. FIG. 2B is an extraction diagram of a portion corresponding to FIG. 2A of the modified example.

  Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding, and do not limit the present disclosure unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted. Also, illustration of elements not directly related to the present disclosure is omitted.

  FIG. 1 is a diagram showing the overall configuration of the polishing apparatus 1. In FIG. 1, only the workpiece W is shown in cross section. The polishing apparatus 1 is used for polishing an inner peripheral surface of a cylindrical workpiece W, for example. As shown in FIG. 1, the polishing apparatus 1 includes a polishing unit 10. The polishing unit 10 is composed of, for example, a grindstone. The polishing unit 10 has, for example, a cylindrical shape.

  The motor 20 includes a main body 21 and a shaft 22 (output shaft). The shaft 22 protrudes from the main body 21. The polishing unit 10 is provided at the tip 23 of the shaft 22. The center of the rotation axis of the shaft 22 (hereinafter simply referred to as the rotation axis) is coaxial with the center axis of the polishing unit 10. That is, the polishing unit 10 is attached to the end of the shaft 22 on the one side in the rotation axis direction, and the main body 21 is located on the other end on the other side in the rotation axis direction. The main body 21 transmits a driving force to the shaft 22.

  The motor 20 is supported by the support unit 30. The support part 30 includes a housing 40 (extension part) and an attachment member 50. The housing 40 is a rod-shaped member extending in the rotation axis direction. The length in the rotation axis direction of the housing 40 is longer than the length in the vertical direction (the vertical direction in FIG. 1) and the length in the depth direction in FIG. However, the length of the casing 40 in the rotation axis direction may be arbitrarily designed according to the length of the workpiece W in the central axis direction.

  A housing hole 42 is formed in the end portion 41 on one side in the rotation axis direction of the housing 40. The main body 21 of the motor 20 is accommodated in the accommodation hole 42 on the side opposite to the shaft 22. That is, the main body 21 of the motor 20 is fitted and attached to the accommodation hole 42 of the housing 40.

  An attachment member 50 is provided at the end 43 on the other side in the rotation axis direction of the housing 40. The attachment member 50 is a plate-like member that extends in a direction perpendicular (perpendicular) to the rotation axis direction. The attachment member 50 extends longer than the housing 40 in the vertical direction. Of the attachment member 50, the end 43 on the other side in the rotation axis direction of the housing 40 is attached to the approximate center in the vertical direction. Further, a rib member 52 that connects the outer surface 44 of the housing 40 and the mounting member 50 is provided.

  Further, the polishing apparatus 1 includes a vertical movable part 60 (first movable part) and a horizontal movable part 70 (second movable part). The vertical movable unit 60 is located on the other side of the casing 40 in the rotation axis direction. The horizontal movable unit 70 is located below the vertical movable unit 60.

  The vertical movable unit 60 includes a base body 61 extending in the vertical direction. A rail 62 is attached to one side of the base 61 in the rotation axis direction. The rail 62 extends in the vertical direction along the base body 61. The block portion 63 (holding member) is disposed between the mounting member 50 and the base body 61. The block part 63 is attached to the attachment member 50.

  A sliding member 64 is attached to the other side of the block portion 63 in the rotation axis direction. The sliding member 64 slides on the rail 62. The rail 62 and the sliding member 64 restrict the movement of the block portion 63 other than the vertical direction.

  The vertical movable unit 60 includes a ball screw (not shown). Among the ball screws, the screw shaft extends in the vertical direction along the base body 61. Of the ball screw, a nut and a ball (not shown) are attached to the block portion 63. When the screw shaft is rotated by the motor 65, the rotational power is converted into vertical power through the nut and the ball, and the block portion 63 moves in the vertical direction. As a result, the support portion 30 can move in the vertical direction (direction perpendicular to the rotation axis) integrally with the block portion 63. Here, the case where the vertically movable unit 60 includes a ball screw has been described. However, the vertically movable unit 60 is not limited to a ball screw, and may be configured by another actuator that is movable on one axis. For example, the vertical movable unit 60 may be a belt drive type or may be driven by a linear motor.

  The horizontal movable part 70 includes a base body 71 extending in the rotation axis direction. A rail 72 is attached to the base 71 on the vertical movable part 60 side (upward). The rail 72 extends in the rotation axis direction along the base body 71. The block unit 73 is disposed between the vertical movable unit 60 and the base body 71. The lower end of the base body 61 of the vertical movable unit 60 is attached to the upper surface 73 a of the block unit 73.

  The rib member 61 a is attached to the outer surface 61 b on the other side in the rotation axis direction of the base body 61 and the upper surface 73 a of the block portion 73.

  A sliding member 74 is attached to the base portion 71 side of the block portion 73. The sliding member 74 slides on the rail 72. The rail 72 and the sliding member 74 restrict the movement of the block portion 73 other than the direction of the rotation axis.

  The horizontal movable unit 70 includes a ball screw (not shown). Among the ball screws, the screw shaft 75 extends along the base 71 in the rotation axis direction. Of the ball screw, a nut and a ball (not shown) are attached to the block portion 73. When the screw shaft is rotated by the motor 76, the rotational power is converted into power in the rotational axis direction via the nut and the ball, and the block portion 73 moves in the rotational axis direction. As a result, the vertical movable unit 60 can move in the direction of the rotation axis integrally with the block unit 73. The support portion 30 can move in the direction of the rotation axis integrally with the vertical movable portion 60. Here, the case where the horizontal movable unit 70 includes a ball screw has been described. However, the horizontal movable unit 70 is not limited to a ball screw, and may be configured by other actuators that are movable on one axis. For example, the horizontal movable unit 70 may be a belt drive type or may be driven by a linear motor.

  As described above, the support portion 30 can be moved in the vertical direction by the vertical movable portion 60 and can be moved in the rotation axis direction by the horizontal movable portion 70. The motor 20 and the polishing unit 10 are integrated with the support unit 30 and can be moved in the vertical direction by the vertical movable unit 60, and can be moved in the rotation axis direction by the horizontal movable unit 70.

  For example, a plurality of turning rollers 80 are provided apart from each other in the rotation axis direction. The outer peripheral surface of the turning roller 80 contacts the outer peripheral surface of the workpiece W. When the turning roller 80 is rotated by the power of a motor (not shown), the workpiece W is rotated.

  The polishing unit 10 of the polishing apparatus 1 is moved to one side (left side in FIG. 1) in the rotation axis direction by the horizontal movable unit 70 and is inserted through the workpiece W. The polishing unit 10 is moved downward (downward in FIG. 1) by the vertical movable unit 60, and the outer peripheral surface of the polishing unit 10 contacts the inner peripheral surface of the workpiece W.

  The polishing unit 10 is rotated by a motor 20. The vertical movable unit 60 applies a load downward to the polishing unit 10. The lower part of the outer peripheral surface of the polishing unit 10 is pressed against the inner peripheral surface of the workpiece W. In this way, the inner peripheral surface of the workpiece W is polished by the polishing unit 10.

  When the workpiece W is rotated by the turning roller 80, a portion of the inner circumferential surface of the workpiece W where the outer circumferential surface of the polishing unit 10 is pressed is displaced in the rotation direction of the workpiece W. As the horizontal movable unit 70 moves the polishing unit 10 in the rotation axis direction, a portion of the inner peripheral surface of the workpiece W where the outer peripheral surface of the polishing unit 10 is pressed is displaced in the rotation axis direction.

  In addition, the polishing apparatus 1 includes a sensor 90. The sensor 90 is sandwiched between the mounting member 50 and the block portion 63 of the vertical movable portion 60.

  FIG. 2A is an extraction diagram in the vicinity of the sensor 90 of the polishing apparatus 1 of the embodiment. FIG. 2B is an extraction diagram of a portion corresponding to FIG. 2A of the modified example.

  As shown in FIG. 2 (a), the attachment member 50 and the block portion 63 are arranged apart from each other in the rotation axis direction. The attachment member 50 and the block part 63 are connected via a spacer 91. The spacer 91 is a metal member extending in the rotation axis direction. The position of the spacer 91 in the vertical direction is, for example, above the housing 40. Fastening holes 53, 63 a and 91 a are formed in the attachment member 50, the block portion 63, and the spacer 91. Bolts 66 are inserted into the fastening holes 53, 63a, 91a, for example, from one side in the rotation axis direction. The tip 66a of the bolt 66 protrudes from the fastening hole 63a. A nut 67 is fastened to the tip 66 a of the bolt 66.

  Thus, the attachment member 50, the block part 63, and the spacer 91 are fastened by the bolt 66 and the nut 67. Here, the case where the attachment member 50, the block part 63, and the spacer 91 are fastened by the bolt 66 and the nut 67 has been described. However, other fastening structures may be used as long as the attachment member 50, the block portion 63, and the spacer 91 are fastened.

  The sensor 90 is sandwiched between the mounting member 50 and the block portion 63 in the rotation axis direction. The sensor 90 is separated from the attachment position (the position of the bolt 66) between the support part 30 and the block part 63. The vertical position of the sensor 90 is, for example, below the housing 40. Furthermore, the vertical position of the sensor 90 is offset with respect to the rotation axis of the shaft 22. When the polishing unit 10 is pressed against the workpiece W by the vertical movable unit 60, an upward load is applied to one end portion 41 (see FIG. 1) of the housing 40 (the rotation axis of the shaft 22) due to a reaction force from the workpiece W. Works. A moment in the clockwise direction in FIG. 2A acts on a portion of the attachment member 50 whose position in the vertical direction is lower than the housing 40. Thereby, a tensile load acts on the sensor 90.

  Here, the case where the position of the sensor 90 in the vertical direction is lower than the housing 40 (the rotation axis of the shaft 22) has been described, for example. However, the vertical position of the sensor 90 may be above the housing 40, for example. In this case, a compressive load acts on the sensor 90.

  The sensor 90 can measure a load (for example, a tensile load) acting on the sensor 90 itself. A control device (not shown) controls the motor 65 of the vertical movable unit 60 according to the output value of the sensor 90. For example, the control device controls the motor 65 of the vertical movable unit 60 so that the output value of the sensor 90 becomes a preset value. Thus, the pressing force of the polishing unit 10 on the workpiece W is controlled to be substantially constant.

  As described above, in the polishing apparatus 1, the polishing unit 10 is provided on the shaft 22 of the motor 20. The housing 40 of the support unit 30 supports the main body 21 of the motor 20. The sensor 90 is provided on the attachment member 50 of the support portion 30. Therefore, for example, as in the case where the sensor 90 is provided between the motor 20 and the polishing unit 10, vibration is less likely to be input to the sensor 90 than when the driving surface of the driving member is supported via the sensor. As a result, noise generated in the output of the sensor 90 is suppressed.

  Further, the horizontal movable unit 70 moves the support unit 30 in the rotation axis direction. For this reason, the sensor 90 also moves in the direction of the rotation axis together with the support portion 30. Thereby, the error of the output of the sensor 90 is suppressed compared with the case where the support part 30 and the sensor 90 move relatively.

  Further, the vertical movable unit 60 moves the support unit 30 in the vertical direction. Therefore, for example, the parallelism between the polishing unit 10 and the workpiece W is improved as compared with the case where the housing 40 is swung around the other side in the rotation axis direction of the housing 40. The pressing force that the polishing unit 10 acts on the workpiece W is made uniform over the rotation axis direction.

  As shown in FIG. 2B, in the modification, the housing 40 and the attachment member 50 are directly attached to the block portion 63. The attachment member 50 is disposed below the housing 40. The rib member 52 is attached to the lower end surface 51 and the block portion 63 of the attachment member 50.

  The casing 40 and the attachment member 50 are spaced apart in the vertical direction. The spacer 91 is provided between the housing 40 and the attachment member 50. Fastening holes 45, 53, and 91 a are formed in the housing 40, the attachment member 50, and the spacer 91. Bolts 66 are inserted into the fastening holes 45, 53, 91a, for example, from the fastening hole 45 side. The front end portion 66 a of the bolt 66 protrudes from the fastening hole 53. A nut 67 is fastened to the tip 66 a of the bolt 66.

  The sensor 190 is sandwiched between the housing 40 and the attachment member 50 in the vertical direction. The position of the sensor 190 in the rotation axis direction is, for example, one side of the rotation axis direction from the spacer 91 (left side in FIG. 2B). When the polishing unit 10 is pressed against the workpiece W by the vertical movable unit 60, a moment in the clockwise direction in FIG. 2B acts on the other side of the casing 40 in the rotation axis direction. Thereby, a tensile load acts on the sensor 190.

  Here, the case where the attachment member 50 and the sensor 190 are provided below the housing 40 has been described, for example. However, the attachment member 50 and the sensor 190 may be provided above the housing 40, for example. In this case, a compressive load acts on the sensor 190.

  Also in the modification, as in the above-described embodiment, a control device (not shown) controls the motor 65 of the vertical movable unit 60 according to the output value of the sensor 190. For example, the control device controls the motor 65 of the vertical movable unit 60 so that the output value of the sensor 190 becomes a preset value. Thus, the pressing force of the polishing unit 10 on the workpiece W is controlled to be substantially constant.

  As mentioned above, although embodiment was described referring an accompanying drawing, it cannot be overemphasized that this indication is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims and that they naturally fall within the technical scope.

  For example, in the embodiment and the modification described above, the case where the horizontal movable unit 70 moves the support unit 30 in the rotation axis direction has been described. That is, the case where the sensors 90 and 190 also move in the direction of the rotation axis together with the support portion 30 has been described. However, the structure which the support part 30 and the sensors 90 and 190 move relatively may be sufficient.

  In the embodiment and the modification described above, the case where the vertical movable unit 60 moves the support unit 30 in the vertical direction has been described. However, the housing 40 may be configured to swing around the other side in the rotation axis direction. Further, the direction in which the vertical movable unit 60 moves the support unit 30 is not limited to the vertical direction, and may be a direction perpendicular to the rotation axis direction. Similarly, the direction in which the horizontal movable unit 70 moves the support unit 30 is not limited to the horizontal direction and may be in the direction of the rotation axis.

  In the embodiment and the modification described above, the case where the polishing unit 10 is attached to the shaft 22 of the motor 20 has been described. However, another member may be interposed between the shaft 22 of the motor 20 and the polishing unit 10. In this case, the member between the shaft 22 and the polishing unit 10 and the shaft 22 serve as the output shaft of the motor 20.

  Further, in the above-described embodiments and modifications, the case where the sensors 90 and 190 can measure the tensile load acting on the sensor 90 itself has been described. However, the sensors 90 and 190 may be able to measure the compressive load acting on the sensors 90 and 190 themselves as described above.

  The present disclosure can be used in a polishing apparatus provided with a polishing unit that is rotationally driven by a motor.

DESCRIPTION OF SYMBOLS 1 Polishing apparatus 10 Polishing part 20 Motor 21 Main body 30 Support part 40 Case (extension part)
60 Vertically movable part (first movable part)
63 Block (holding member)
70 Horizontal movable part (second movable part)
90 sensor 190 sensor

Claims (4)

A motor,
A polishing section that is rotationally driven by the motor;
A support portion for supporting the main body of the motor;
A holding member to which the support portion is attached at a position spaced apart from the polishing portion in the rotation axis direction;
It is separated from the mounting position of the support part and the holding member, is sandwiched between the support part and the holding member, and measures one of the tensile load in the rotation axis direction and the compression load in the rotation axis direction A sensor that is possible,
A polishing apparatus comprising: The support portion includes an extending portion that extends along the rotation axis direction, and an attachment member that is provided in the extension portion and extends in a direction perpendicular to the rotation axis direction and attached to the holding member. ,
The polishing apparatus according to claim 1, wherein the sensor is sandwiched between the holding member and the mounting member. The polishing apparatus according to claim 1, further comprising a first movable portion that moves the support portion in a direction perpendicular to the rotation axis direction. The polishing apparatus according to claim 1, further comprising a second movable portion that moves the support portion in the rotation axis direction.

Images