Grinding apparatus and grinding method

Abstract

The outer diameter of the workpiece during grinding is measured appropriately. [Solution] A grinding apparatus for grinding a long cylindrical workpiece by rotating it around an axis and moving a grinding wheel axially relative to the workpiece comprises a bed, a sizing device fixed to the bed and configured to measure the outer diameter of the workpiece, a table configured to move axially relative to the bed together with the workpiece, a rest device that rotatably supports the workpiece by contacting the outer surface of the workpiece and is configured to adjust the support position of the workpiece in a direction perpendicular to the axis, and a rest adjustment unit that adjusts the support position according to the outer diameter measured while the workpiece is being ground. The sizing device measures the outer diameter by contacting the tip of a contact terminal to the outer surface. The tip is configured to suppress wear of the workpiece due to contact between the tip and the workpiece.

Claims

1. A grinding apparatus for grinding a long, cylindrical workpiece by rotating it around an axis and moving a grinding wheel relative to the workpiece in the axial direction along the axis, The bed on which the grinding wheel is fixed, A measuring device fixed to the bed and configured to measure the outer diameter value of the workpiece, A table on which the workpiece is placed and configured to be movable relative to the bed in the axial direction together with the workpiece, A rest device having a contact portion that contacts the outer circumferential surface of the workpiece, and the rest device being configured to adjust the support position of the workpiece by the contact portion in a direction perpendicular to the axis, The system includes a rest adjustment unit that adjusts the support position according to the outer diameter value measured while the workpiece is being ground, The measuring device has a contact terminal that can contact the outer circumferential surface, and measures the outer diameter value by bringing the tip of the contact terminal into contact with the outer circumferential surface. A grinding apparatus wherein the tip portion is configured to suppress wear of the workpiece due to contact between the tip portion and the workpiece.

2. A grinding apparatus according to claim 1, The aforementioned sizing device is a grinding device that is positioned so as to intersect the axial direction at an angle when viewed in the vertical direction.

3. A grinding apparatus according to claim 1, further, The system includes an acquisition unit that uses the measured outer diameter value to acquire a rest wear amount, which represents the amount of wear on the contact portion. A grinding apparatus in which the Vickers hardness of the contact portion is lower than the Vickers hardness of the workpiece.

4. A grinding apparatus according to claim 3, The rest adjustment unit is a grinding device that adjusts the support position according to the amount of rest wear.

5. A grinding apparatus according to claim 1, A grinding apparatus in which the Vickers hardness of the tip is lower than the Vickers hardness of the workpiece.

6. A grinding apparatus according to claim 5, further, The system includes an acquisition unit that acquires the amount of terminal wear, which is the amount of wear on the tip portion. The rest adjustment unit further adjusts the support position according to the amount of terminal wear in the grinding apparatus.

7. A grinding apparatus according to claim 5, The aforementioned workpiece is made of steel, The aforementioned tip portion is made of a resin material, and the device is a grinding apparatus.

8. A grinding apparatus according to claim 1, The rest device is fixed to the table, The contact portion includes a lateral contact portion that contacts the outer peripheral surface from the opposite side of the grinding wheel in a direction along the cutting direction of the grinding wheel into the workpiece, and a lower contact portion that contacts the outer peripheral surface from the lower side of the workpiece. The aforementioned sizing device is further a grinding device positioned diagonally across the horizontal plane.

9. A grinding apparatus according to claim 8, The contact terminal includes a first contact terminal that contacts the outer circumferential surface from the opposite side of the lateral contact portion in a direction along the cutting direction, and a second contact terminal that contacts the outer circumferential surface of the workpiece from the opposite side of the first contact terminal. The measuring device measures the first outer diameter value by bringing the first tip of the first contact terminal into contact with the outer circumferential surface, and measures the second outer diameter value by bringing the second tip of the second contact terminal into contact with the outer circumferential surface. The support position includes a lateral support position in which the workpiece is supported by the lateral contact portion and a lower support position in which the workpiece is supported by the lower contact portion. The aforementioned rest adjustment unit is Furthermore, an initial adjustment is performed to adjust the support position before grinding the workpiece, according to the outer diameter value measured before grinding the workpiece begins. A grinding apparatus that, in the initial adjustment described above, adjusts the lateral support position according to the first outer diameter value and adjusts the lower support position according to the second outer diameter value.

10. A grinding apparatus according to claim 1, The rest adjustment unit adjusts the support position after grinding of the workpiece has started, such that at least a portion of the grinding wheel is positioned at the end of the workpiece in the axial direction, and the grinding wheel is spaced apart from the workpiece, while adjusting the support position.

11. A grinding apparatus according to any one of claims 1 to 10, further comprising: A grinding apparatus comprising an inspection unit that performs an inspection process for inspecting a workpiece by measuring the outer diameter of the grinding workpiece using the measuring device while the workpiece and the grinding wheel are separated.

12. A grinding apparatus according to claim 11, The inspection unit is a grinding machine that, in the inspection process, measures the outer diameter value by moving the tip relative to the workpiece in the axial direction while keeping the tip in contact with the workpiece.

13. A grinding apparatus according to claim 12, The inspection unit is a grinding apparatus that measures the outer diameter value over the entire length of the workpiece in the axial direction during the inspection process.

14. A grinding apparatus according to claim 12, further, A grinding apparatus comprising a grinding section that performs spark-out processing of the workpiece after the measurement of the outer diameter value in the inspection process is completed.

15. A grinding apparatus according to claim 11, The inspection unit is a grinding apparatus that, in the inspection process, measures the outer diameter values ​​of one end, the other end, and the center of the workpiece in the axial direction by performing a contact process in which the tip is brought close to the workpiece to bring the tip and the workpiece into contact, and a movement process in which the tip is moved relative to the workpiece in the axial direction while the tip is separated from the workpiece.

16. A grinding method for grinding a long, cylindrical workpiece, The process of grinding the workpiece by rotating the workpiece around its axis and moving the table on which the workpiece is placed relative to the bed in the axial direction along the axis, together with the workpiece, thereby moving the grinding wheel fixed to the bed relative to the workpiece in the axial direction, While the workpiece is being ground, a step is taken to measure the outer diameter of the workpiece using a measuring device fixed to the bed. A support position of a rest device that rotatably supports the workpiece by a contact portion that contacts the outer circumferential surface of the workpiece, comprising the step of adjusting the support position of the workpiece by the contact portion in a direction perpendicular to the axial direction according to the measured outer diameter value, The measuring device has a contact terminal that can contact the outer circumferential surface, and measures the outer diameter value by bringing the tip of the contact terminal into contact with the outer circumferential surface. A grinding method wherein the tip portion is configured to suppress wear of the workpiece due to contact between the tip portion and the workpiece.

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