WO2017030049A1 - Meuleuse et procédé de meulage - Google Patents

Meuleuse et procédé de meulage Download PDF

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Publication number
WO2017030049A1
WO2017030049A1 PCT/JP2016/073450 JP2016073450W WO2017030049A1 WO 2017030049 A1 WO2017030049 A1 WO 2017030049A1 JP 2016073450 W JP2016073450 W JP 2016073450W WO 2017030049 A1 WO2017030049 A1 WO 2017030049A1
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WO
WIPO (PCT)
Prior art keywords
workpiece
wheel
grinding
blade
grinding wheel
Prior art date
Application number
PCT/JP2016/073450
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English (en)
Japanese (ja)
Inventor
一郎 岩坂
裕介 内田
俊男 光畑
Original Assignee
コマツＮｔｃ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by コマツＮｔｃ株式会社 filed Critical コマツＮｔｃ株式会社
Publication of WO2017030049A1 publication Critical patent/WO2017030049A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
    • B24B5/04—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/02—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent
    • B24B49/04—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent involving measurement of the workpiece at the place of grinding during grinding operation

Definitions

  • the present invention relates to a grinding machine and a grinding method for sandwiching and grinding a workpiece between a grinding wheel and an adjustment wheel while rotating and supporting the workpiece with a support device.
  • grinders see, for example, Patent Document 1
  • grinders 2 and 3 that grind the outer peripheral surface of a work while rotating the work between a tailstock and a spindle.
  • the present invention has been devised to solve the above-described problem, and is a cylindrical member that is long and has a high degree of coaxiality with respect to the axial center over the entire length and a high roundness of the outer peripheral surface. It is an object of the present invention to provide a grinding machine and a grinding method capable of manufacturing the same.
  • the invention according to claim 1 for solving the above-mentioned problems includes an adjusting wheel, a blade, and a cylindrical grinding wheel, and the grinding wheel while rotating and supporting a columnar workpiece by the adjusting wheel and the blade.
  • a grinding machine that sandwiches and grinds the workpiece with the adjusting wheel, and further includes a support device that rotatably supports both end portions of the workpiece, and the support device is coaxial with the rotation centers at both ends of the workpiece. It is a grinder characterized by having a pair of support members that support in a state.
  • the work is rotatably supported by the adjusting wheel and the blade, and is sandwiched and ground between the grinding wheel and the adjusting wheel, so that the roundness of the outer peripheral surface can be increased. Furthermore, since the grinding is performed in a state where the rotation centers at both ends of the workpiece are supported coaxially by the support device, one rotation center passes through the entire length of the workpiece. Thereby, the coaxiality of the workpiece with respect to the rotation center can be increased. In addition, since it is not necessary for the support device to rotate the workpiece, a high degree of coaxiality between the pair of support members can be easily ensured. Moreover, since the workpiece
  • the workpiece while the rotation center at both ends of the workpiece is supported by the support member, the workpiece can be ground by the grinding wheel while rotating the workpiece by the adjusting wheel, and the contact between each member and the workpiece and the rotation center can be obtained. Since the distance is constant, the roundness of the outer peripheral surface of the workpiece and the coaxiality with respect to the rotation center can be further increased.
  • the axial center position of the support member is fixed, and the synchronization mechanism applies a predetermined pressing force to the adjustment wheel to move the adjustment wheel to the workpiece side.
  • Adjusting wheel moving means, blade moving means for applying a predetermined pressing force to the blade and moving the blade to the workpiece side, and applying a predetermined pressing force to the grinding wheel to attach the grinding wheel to the workpiece What is provided with the grinding wheel moving means moved to the side is preferable.
  • the above configuration shows an example of a synchronization mechanism.
  • a known mechanism such as a ball screw or a cylinder may be used as long as the pressing force can be held at a predetermined value within the range of the grinding length of the workpiece.
  • the axial center position of the support device is fixed, and the synchronization mechanism includes a measuring device that measures the outer diameter of the workpiece, What adjusts the said adjustment wheel and the said blade synchronously according to an outer diameter is preferable.
  • the above configuration shows an example of a synchronization mechanism.
  • the moving distance of the adjusting wheel, the blade, and the grinding wheel is appropriately calculated according to the angle formed by the moving direction of each member and the radial direction connecting the contact point of each member and the workpiece and the rotation center. Since the support member is fixed as in the above configuration and the adjusting wheel and the blade are moved synchronously according to the measured outer diameter of the workpiece, the workpiece can be held with an appropriate pressing force, so that the outer peripheral surface of the workpiece The degree of roundness and the degree of coaxiality with respect to the center of rotation can be increased.
  • the invention according to claim 5 for solving the above-described problem is to support the rotation centers of both ends of the cylindrical workpiece so as to be rotatable in a coaxial state, and to grind while rotating and supporting the workpiece with an adjusting wheel and a blade. It is a grinding method characterized by sandwiching and grinding the work between a grindstone and the adjusting wheel.
  • the roundness of the outer peripheral surface can be increased. Furthermore, since grinding is performed in a state where the rotation centers at both ends of the workpiece are supported coaxially, a single rotation center passes through the entire length of the workpiece. Thereby, the coaxiality with respect to the shaft center can be increased. Moreover, since the workpiece
  • FIG. 4 is a diagram showing a final grinding state.
  • the grinding machine 1 includes an adjusting wheel 10, a blade 20, a grinding wheel 30, and a support device 40.
  • the support device 40 that supports the workpiece 2 is fixed, and the workpiece 2 rotates at the same axial position.
  • the adjusting wheel 10, the blade 20, and the grinding wheel 30 move so as to approach and separate from the workpiece 2.
  • the adjusting wheel 10 has a cylindrical shape and is arranged so that the rotating shaft 11 extends in the horizontal direction.
  • the adjusting wheel 10 is rotatably supported by an adjusting wheel frame 12 provided on the bed 3.
  • a motor 15 (see FIG. 2) for rotating the adjustment wheel 10 is connected to the rotating shaft 11 via a rotational force transmitting means such as a belt 16 (see FIG. 2).
  • the adjusting wheel frame 12 is provided with adjusting wheel moving means 14 for moving the adjusting wheel frame 12 forward and backward (to approach and move away from the rotation center of the work 2).
  • the adjustment vehicle moving means 14 moves the adjustment vehicle 10 by moving the adjustment vehicle frame 12 forward and backward.
  • the adjustment vehicle frame 12 is installed on the slide table 4 disposed on the bed 3 via a static pressure guide mechanism 13 (see FIG. 1) having a static pressure guide (not shown).
  • the static pressure guide extends in a horizontal direction orthogonal to the rotating shaft 11 of the adjustment wheel 10, and the adjustment wheel frame 12 can move forward and backward so that it can approach and separate from the workpiece 2 and the grinding wheel 30.
  • the adjustment vehicle moving unit 14 includes a drive unit that moves the adjustment vehicle frame 12 and a guide unit that guides the movement.
  • the static pressure guide mechanism 13 constitutes a guide means.
  • the guide means is not limited to the static pressure guide mechanism 13 and may be of other configuration such as a link mechanism.
  • the drive means of the adjustment wheel moving means 14 moves the adjustment wheel 10 along the static pressure guide.
  • the drive means includes, for example, a feed motor and a ball screw (not shown), and moves the adjustment vehicle frame 12 by rotating the ball screw with the feed motor.
  • the amount of movement of the adjustment vehicle 10 is managed by torque control.
  • the moving mechanism of the adjustment vehicle moving means 14 is not limited to the said structure, Other movement mechanisms, such as a cylinder, a spring, and a linear motor, may be sufficient.
  • the grinding wheel 30 has a cylindrical shape and is disposed on the side of the adjustment wheel 10.
  • the grinding wheel 30 is arranged so that the rotation shaft 31 of the grinding wheel 30 is parallel to the rotation shaft 11 of the adjustment wheel 10.
  • the center height position of the rotating shaft 31 of the grinding wheel 30 is the same as the center height position of the rotating shaft 11 of the adjusting wheel 10.
  • the grinding wheel 30 is rotatably supported by a grinding wheel frame 32 provided on the bed 3.
  • a grindstone motor 35 (see FIG. 2) for rotating the grinding grindstone 30 is connected to the rotating shaft 31 via a rotational force transmitting means such as a belt 36 (see FIG. 2).
  • the grinding wheel frame 32 is provided with a grinding wheel moving means 34 for moving the grinding wheel frame 32 forward and backward (to move closer to and away from the rotation center of the workpiece 2).
  • the grinding wheel moving means 34 moves the grinding wheel 30 by moving the grinding wheel frame 32 back and forth.
  • the grinding wheel frame 32 is installed on the slide table 4 disposed on the bed 3 via a linear guide mechanism 33 having a linear guide (not shown).
  • the linear guide extends in a horizontal direction perpendicular to the rotating shaft 11 of the adjusting wheel 10, and the grinding wheel frame 32 can be moved forward and backward so as to be able to approach and separate from the workpiece 2 and the grinding wheel 30.
  • the grinding wheel moving means 34 includes driving means for moving the grinding wheel frame 32 and guide means for guiding the movement.
  • the linear guide mechanism 33 constitutes a guide means.
  • the guide means is not limited to the linear guide mechanism 33, and may have other configurations such as a link mechanism.
  • the driving means of the grinding wheel moving means 34 includes, for example, a feed motor and a ball screw, and the grinding wheel frame 32 is moved by rotating the ball screw with the feed motor.
  • the amount of movement of the grinding wheel 30 is managed by torque control.
  • the moving mechanism of the grinding wheel moving means 34 is not limited to the above-described configuration, and may be another moving mechanism such as a cylinder, a spring, or a linear motor.
  • the blade 20 supports the workpiece 2 from below. It arrange
  • the upper surface of the blade 20 is inclined so that the grinding wheel 30 side becomes higher.
  • the blade 20 is fixed to a blade frame 21 provided on the bed 3 so as to be movable up and down.
  • the blade frame 21 is provided with blade moving means 23 for moving the blade 20 up and down.
  • the blade moving means 23 includes, for example, a hydraulic cylinder, and moves the blade 20 by expansion and contraction of the hydraulic cylinder.
  • the amount of movement of the blade 20 is managed by NC torque control.
  • the adjusting wheel 10, the blade 20, and the grinding wheel 30 have the same arrangement relationship as that of a general centerless grinding machine.
  • the blade 20 and the grinding wheel 30 in addition to the adjusting wheel 10 can be moved, which is different from a general centerless grinding machine.
  • a general centerless grinding machine does not support a workpiece.
  • a support device 40 that rotatably supports both axial ends of the workpiece 2 is provided.
  • the adjustment wheel and the workpiece move during grinding.
  • the workpiece 2 is fixed, and the adjustment wheel 10, the blade 20, and the grinding wheel 30. Move relative to the workpiece 2.
  • the support device 40 has a pair of support members 41 and 41 that support the rotation centers at both ends of the work 2 in a coaxial state.
  • the support member 41 has a conical shape with a pointed center.
  • the tip of the cone of the support member 41 is inserted into the recess 2 a formed at the end of the work 2.
  • the concave portion 2 a of the workpiece 2 has a circular cross section, and the center of the circle coincides with the axis of the workpiece 2.
  • the opening peripheral edge 2b of the recess 2a is in contact with a conical outer peripheral surface 42 (see FIG. 2B), and is in sliding contact with the conical outer peripheral surface 42 when the workpiece 2 is processed.
  • the pair of support members 41 and 41 are arranged so that their axial centers (cone centers) coincide with each other.
  • the support member 41 is fixed to a pair of support pillars 44, 44 erected on both ends of the base portion 43.
  • the base portion 43 extends along the axial length direction of the workpiece 2 and is laid on the bed 3.
  • the pair of support pillars 44 and 44 are fixed to both ends of the base portion and face each other.
  • a support member 41 is fixed to the surfaces of the support columns 44, 44 facing each other.
  • One support column 44 is erected so as to be movable along the axial length direction of the workpiece 2.
  • the other support column 44 is erected so as not to move.
  • the grinding machine 1 further includes a synchronization mechanism that relatively moves the adjustment wheel 10, the blade 20, the grinding wheel 30, and the support members 41 and 41.
  • the synchronization mechanism moves the adjustment wheel 10, the blade 20, and the grinding wheel 30.
  • the synchronizing mechanism includes an adjustment wheel moving means 14, a blade moving means 23, a grinding wheel moving means 34, and a control means (not shown) electrically connected to these moving means 14, 23, 34. ing.
  • the synchronization mechanism includes a distance (first diameter dimension) L1 from the contact point between the adjustment wheel 10 and the workpiece 2 to the rotation center P of the workpiece 2, and a distance (first dimension) from the contact point between the blade 20 and the workpiece 2 to the rotation center P of the workpiece 2.
  • Each part is moved so that the (diameter dimension) L2 and the distance (third diameter dimension) L3 from the contact point between the grinding wheel 30 and the workpiece 2 to the rotation center P of the workpiece are the same.
  • the peripheral speed of the adjusting wheel 10 is set slower than the peripheral speed of the grinding wheel 30.
  • the control device applies a predetermined constant pressing force to the adjustment vehicle 10 to move the adjustment vehicle 10 toward the workpiece 2 by making the current sent to the feed motor of the adjustment vehicle moving means 14 constant. Further, the control device applies a predetermined constant pressing force to the blade 20 to move the blade 20 toward the workpiece 2 by making the expansion / contraction torque of the hydraulic cylinder of the blade moving means 23 constant.
  • the control of the pressing force of the adjusting wheel 10 and the blade 20 is not limited to the above method, and a pressing force detecting device for detecting the pressing force of the adjusting wheel 10 and the blade 20 is provided. While detecting the pressing force, the output may be adjusted so as to keep each pressing force constant.
  • Each predetermined pressing force is a numerical value that allows the adjusting wheel 10 and the blade 20 to grind while pressing the work 2 in a well-balanced manner.
  • the grinding wheel 30 is fed (moved) by the grinding amount in accordance with the processing dimensions of the workpiece 2. Thereby, the grinding wheel 30 grinds the workpiece 2 by a desired thickness. That is, when grinding is performed using the grinding machine 1, the workpiece 2 is pressed and rotated by the adjusting wheel 10 while being rotatably supported by the blade 20 from below. At this time, the rotation center of both ends of the work 2 is supported by the support members 41 and 41, and the axial center position is fixed. In this state, when the grinding wheel 30 is fed by the grinding amount in accordance with the processing dimension, the workpiece 2 is ground and reduced in diameter. In response to this, the adjusting wheel 10 and the blade 20 move to the axial center side.
  • the adjusting wheel 10 and the blade 20 are pressed against the workpiece 2 with a predetermined pressing force, respectively.
  • the grinding wheel 30 is fed to grind the workpiece 2 while the adjusting wheel 10 and the blade 20 rotate and support the workpiece 2 with a predetermined pressing force, so that the first to third diameter dimensions L1, L1 of the workpiece 2 are obtained.
  • L2 and L3 are the same.
  • the first to third diameter dimensions L1, L2, and L3 gradually decrease while maintaining the same length. 4A and 4B, the rotation center P of the workpiece 2 is fixed and at the same position.
  • the rotation centers of both ends of the workpiece 2 are supported by the support members 41 and 41 so as to be rotatable coaxially, and the workpiece is adjusted by the adjusting wheel 10 and the blade 20. While rotating 2, the workpiece 2 is sandwiched between the grinding wheel 30 and the adjustment wheel 10 for grinding.
  • the support device 40 that supports the workpiece 2 is fixed, and the workpiece 2 rotates at the same axial position.
  • the adjusting wheel 10, the blade 20, and the grinding wheel 30 move so as to approach the rotation center of the workpiece 2 in accordance with the grinding of the workpiece 2.
  • the workpiece 2 is sandwiched between the grinding wheel 30 and the adjusting wheel 10 and ground while being rotated and supported by the adjusting wheel 10 and the blade 20.
  • the circularity can be increased.
  • work 2 according to the axial direction length of the adjustment wheel 10 and the grinding wheel 30 can be processed, a long product can be manufactured.
  • the adjusting wheel 10, the blade 20, and the grinding wheel 30 press the workpiece 2 in a well-balanced manner, excessive bending stress does not act on the workpiece 2, and the occurrence of distortion can be prevented.
  • the grinding is performed with the support members 41 and 41 supporting the rotational centers at both ends of the workpiece 2 in a coaxial state, one rotational center passes through the entire length of the workpiece 2. Thereby, the coaxiality with respect to the axial center of the workpiece 2 can be increased. Since the support device 40 does not need to rotate the workpiece 2, the pair of support members 41 and 41 can be easily arranged with high coaxiality.
  • the grinding wheel 30 is appropriately sent according to the grinding amount of the workpiece 2 to grind the workpiece 2, and the pressing force for moving the adjustment wheel 10 and the pressing force for moving the blade 20 are fixed to each other.
  • the distances L1, L2, and L3 between the adjusting wheel 10, the blade 20, and the grinding wheel 30 and the rotation center of the workpiece 2 are made the same by controlling the values to be the same values.
  • the method of controlling the movement of 30 is not limited to this embodiment.
  • the outer diameter of the workpiece 2 can be measured, and the movement amounts of the adjusting wheel 10, the blade 20, and the grinding wheel 30 can be designated by distances and moved synchronously according to the measured values.
  • a measuring device for measuring the outer diameter of the workpiece 2 is further provided as a synchronization mechanism.
  • a sizing gauge capable of measuring the outer diameter across the outer peripheral surface of the rotating workpiece 2 is used.
  • the sizing gauge is disposed at both ends of the work 2.
  • the grinding amount (length) is measured by the measuring device. Based on the amount of grinding by the control device, the moving distances of the adjustment wheel 10, the blade 20, and the grinding wheel 30 are calculated.
  • the adjusting wheel 10 Since the straight line connecting the contact point of the adjusting wheel 10 (or grinding wheel 30) with the work 2 and the rotation center P is along the moving direction (horizontal direction) of the adjusting wheel 10 (or grinding wheel 30), the adjusting wheel 10 The moving distance of the grinding wheel 30 is the same as the grinding amount (the final grinding amount is calculated from the processing dimension of the workpiece 2). Since the straight line connecting the contact point of the blade 20 with the work 2 and the rotation center P is inclined with respect to the moving direction (vertical direction) of the blade 20, the moving distance of the blade 20 is calculated from the grinding amount and the inclination angle. Is done.
  • the outer diameter dimension of the work 2 is measured, and the adjustment wheel 10, the blade 20 and the grinding wheel 30 corresponding to it.
  • the distance is moved, it is not limited to this.
  • a movement amount detecting means (not shown) may be provided. In this case, the moving amount of the adjusting wheel 10 is detected, the moving distance of the blade 20 and the grinding wheel 30 is calculated according to the moving distance of the adjusting wheel 10, and the moving of the adjusting wheel 10, the blade 20 and the grinding wheel 30 is performed. Synchronize.
  • the movement amount detection means includes a position sensor and detects the position of the adjustment vehicle 10.
  • the movement amount detection means is electrically connected to the control means.
  • the movement amount of the grinding wheel 30 may be detected by the movement amount detection means.
  • the movement amount of the grinding wheel 30 is detected, the movement distance of the adjustment wheel 10 and the blade 20 is calculated according to the movement distance of the grinding wheel 30, and the movement of the adjustment wheel 10, the blade 20 and the grinding wheel 30 is moved. Synchronize.
  • the support member, the grinding wheel, and the adjustment wheel can be moved synchronously, and the blade is fixed (pattern 3).
  • the support member, the grinding wheel, and the blade can be moved synchronously, and the adjustment wheel is fixed (pattern 4).
  • the support member, the adjusting wheel, and the blade can be moved synchronously, and the grinding wheel is fixed (pattern 5).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Abstract

La présente invention concerne la fabrication d'éléments cylindriques allongés, avec un haut degré de coaxialité avec le centre de l'arbre sur toute la longueur de celui-ci, et également un haut degré de rotondité de la surface circonférentielle extérieure. Une meuleuse (1) qui est pourvue d'une roue d'ajustement (10), d'une lame (20) et d'une meule cylindrique (30) et qui meule une pièce à usiner cylindrique (2) insérée entre la meule (30) et la roue d'ajustement (10) tout en supportant à rotation la pièce à usiner (2) avec la roue d'ajustement (10) et la lame (20), est caractérisée en ce qu'elle est également pourvue d'un dispositif de support (40) pour supporter à rotation les deux extrémités de la pièce à usiner et en ce que le dispositif de support (40) comprend une paire d'éléments de support (41), (41) pour supporter coaxialement les centres de rotation des deux extrémités de la pièce à usiner (2).
PCT/JP2016/073450 2015-08-18 2016-08-09 Meuleuse et procédé de meulage WO2017030049A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015161366A JP2017039177A (ja) 2015-08-18 2015-08-18 研削盤および研削方法
JP2015-161366 2015-08-18

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WO2017030049A1 true WO2017030049A1 (fr) 2017-02-23

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Cited By (1)

* Cited by examiner, † Cited by third party
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CN113579871A (zh) * 2021-07-01 2021-11-02 泰州市瑞驰动力机械有限公司 一种电机轴生产用同轴度检测的检具

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CN109702495B (zh) * 2019-02-18 2020-02-07 帅翼驰新材料集团有限公司 一种铝合金棒材的加工设备的工作方法
JP7054253B2 (ja) * 2020-08-07 2022-04-13 西部自動機器株式会社 ワーク位置維持装置
CN113275961B (zh) * 2021-07-22 2021-10-12 山东明博智能科技有限公司 一种纸箱包装机传送金属辊表面处理装置

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JP2004538164A (ja) * 2001-08-14 2004-12-24 エルビン・ユンカー・マシーネンファブリーク・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング 心なし円筒研削方法および装置
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JPH0796452A (ja) * 1993-09-29 1995-04-11 Bando Chem Ind Ltd 弾性体ローラの研削方法とその装置
JP2004538164A (ja) * 2001-08-14 2004-12-24 エルビン・ユンカー・マシーネンファブリーク・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング 心なし円筒研削方法および装置
JP2006263835A (ja) * 2005-03-22 2006-10-05 Toyota Motor Corp 研削装置、研削方法、及びその研削方法により製造されるシャフト
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113579871A (zh) * 2021-07-01 2021-11-02 泰州市瑞驰动力机械有限公司 一种电机轴生产用同轴度检测的检具
CN113579871B (zh) * 2021-07-01 2022-11-25 泰州市瑞驰动力机械有限公司 一种电机轴生产用同轴度检测的检具

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