Gear grinder

Abstract

To enable a dimension of a gear attached to a rotary shaft to be measured to reduce work hours of an inspection in a gear grinder.SOLUTION: A gear grinder includes: a grinding stone rotation shaft 5a which may rotate a grinding stone; a rotary table 4 which is located adjacent to the grinding stone rotation shaft, has a table rotation shaft 4a extending in a direction intersecting with the grinding stone rotation shaft, and may rotate around the table rotation shaft; at least two workpiece processing parts 41 each of which has a workpiece rotation shaft 7a provided at the rotary table, may revolve around the table rotation shaft, and rotate a workpiece around the workpiece rotation shaft; and a measurement device 20 which is provided outside the rotary table in a manner that the measurement device 20 can measure a dimension of the workpiece attached to the workpiece rotation shaft. The measurement device measures a dimension of a gear set as the workpiece, has a probe 21 at a tip of an arm part 22 extending to the inner side of the rotary table, and is configured to cause the probe to contact with the gear attached to the workpiece rotation shaft to measure the dimension.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to gear grinding machines. [Background technology]

[0002] Conventionally, gear grinding machines are known that mesh a grinding wheel with a gear, which is a workpiece, to finish the tooth surface of the gear. For example, as shown in Patent Document 1, there is a gear grinding machine having a configuration in which a plurality of workpiece spindles are rotatably supported on a rotating plate. In such a gear grinding machine, while a workpiece placed on one workpiece spindle is being ground with a grinding wheel, it is possible to remove a machined workpiece placed on another workpiece spindle and place a new unmachined workpiece on it. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4475817 Summary of the Invention [Problem to be solved by the invention]

[0004] Gears machined by gear grinding machines are evaluated for grinding accuracy using various measuring devices. For example, an OBD (over ball diameter) measuring device measures the gear's dimensions by placing a gauge against the gear groove to obtain an OBD measurement value. If the difference between a preset reference value and the OBD measurement value is within an acceptable range, the gear passes, but if it fails, the gear is ground again (in-feed processing) using a gear grinding machine. In this case, the gear must be removed from the gear grinding machine to measure the OBD measurement value, and then reinstalled, which creates a problem of increased inspection man-hours.

[0005] The present disclosure has been made in consideration of the above points, and its purpose is to enable a gear grinding machine to measure the dimensions of a gear attached to a rotating shaft, thereby reducing the inspection man-hours. [Means for solving the problem]

[0006] In order to achieve the above object, the disclosed technique includes a measuring device outside the turntable. A grindstone rotation shaft capable of rotating the grindstone; a rotary table having a table rotation axis adjacent to the grindstone rotation axis and extending in a direction intersecting the grindstone rotation axis, the rotary table being rotatable about the table rotation axis; At least two workpiece machining units each having a workpiece rotation axis provided on the rotary table, capable of rotating around the table rotation axis and rotating a workpiece around the workpiece rotation axis; a measuring device provided outside the rotary table so as to be capable of measuring the dimensions of the workpiece attached to the workpiece rotation shaft; The measuring instrument is a measuring instrument for measuring the dimensions of the gear as the workpiece, and has a measuring probe at the tip of an arm portion extending toward the inside of the rotating table, and is configured so that measurements can be made by bringing the measuring probe into contact with the gear attached to the workpiece rotation shaft.

[0007] According to the above configuration, the dimensions of the workpiece can be measured while it is attached to the workpiece rotation shaft, so there is no need to remove the workpiece for measurement. Even if the measurement result shows that the dimensions do not meet the standards and grinding needs to be done again, the additional grinding can be started immediately, so the inspection man-hours can be reduced.

[0008] The gear grinding machine disclosed herein may be configured so that when one of the workpiece processing sections and the grinding wheel rotation shaft face each other, the measuring device faces the other workpiece processing section so as to be able to measure the dimensions of a workpiece installed in the other workpiece processing section.

[0009] According to the above configuration, while a workpiece is being ground in one work processing section, the machined workpiece can be measured in another work processing section, so that the measurement time does not affect the cycle time, resulting in good manufacturing efficiency.

[0010] In addition, the gear grinding machine of the present disclosure may further include a control unit that compares the measurement value input from the measuring device with a preset reference value and controls the gear grinding machine by feedback control based on the comparison result.

[0011] According to the above configuration, it is possible to improve the manufacturing efficiency and stabilize the processing dimensions. Effect of the Invention

[0012] As described above, the present disclosure makes it possible to provide a gear grinding machine that makes it possible to measure the dimensions of a machined gear in its attached state, thereby reducing the number of inspection steps. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic perspective view of a gear grinding machine according to a first embodiment. [Diagram 2] FIG. 1 is a schematic plan view of a gear grinding machine according to a first embodiment. [Diagram 3] FIG. 1 is a schematic side view of a gear grinding machine according to a first embodiment. [Figure 4] FIG. 6 is a schematic plan view of a gear grinding machine according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, the present embodiment will be described in detail with reference to the drawings. 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 uses.

[0015] Fig. 1 is a perspective view of the gear grinding machine according to the first embodiment, Fig. 2 is a plan view, and Fig. 3 is a side view. As shown in Fig. 1 to Fig. 3, the gear grinding machine 1 according to this embodiment is a device that grinds workpieces 11, 12, 13 (hereinafter referred to as workpieces) such as gears by using a rotating grinding wheel.

[0016] Hereinafter, in this embodiment, when the direction in which the grinding wheel column 3 and the rotating table 4 are lined up is viewed as the left-right direction as shown in FIG. 3, the left-right direction is the X-axis direction, the depth direction of the paper perpendicular to the X-axis is the Y-axis direction, and the up-down direction in which the grinding wheel column 3 is erected is the Z-axis direction.

[0017] The gear grinding machine 1 includes a substantially rectangular parallelepiped bed 2 as a housing for accommodating drive devices such as motors for driving each of the rotary shafts and the conveying device described later. A grinding wheel column 3 and a rotary table 4 are arranged adjacent to each other on the upper surface of the bed 2. The bed 2 has the grinding wheel column 3 standing upright at the top of one end side in the longitudinal direction, the rotary table 4 arranged at the top of the other end side, and a measuring device 20 arranged at the top of the other end side. Various drive devices (not shown) and a control unit 10 for controlling them are accommodated inside the bed 2. The gear grinding machine 1 is also covered on its outer periphery by a cover 100. The cover 100 is shown only in FIG. 2 and is omitted in FIGS. 1 and 3. The cover 100 includes a plurality of openable and closable work doors 101 on the outer periphery of the rotary table 4. The work doors 101 enable an operator to replace a grinding wheel on the rotary table 4 and to replace a work by a work exchange device 9 described later.

[0018] The grindstone column 3 is movable in the X-axis direction and can advance and retreat with respect to the rotary table 4. The grindstone column 3 includes a grindstone moving device 31 that drives in the Y-axis direction and the Z-axis direction, and a grindstone head 32 that rotatably and detachably supports the grindstone 5. The grindstone moving device 31 includes a Z-direction slider (not shown) that can move in the Z-axis direction, and a Y-direction slider (not shown) that can move in the Y-axis direction is provided on the Z-direction slider, so that the grindstone head 32 can be driven in the Y-axis direction and the Z-axis direction. The grindstone head 32 can be moved in the Y-axis direction and the Z-axis direction by the grindstone moving device 31. The grindstone head 32 has a grindstone rotation axis 5a that extends in the Y-axis direction and a grindstone angle rotation axis 5b that extends in the X-axis direction, and drives the grindstone 5 to rotate. As shown in FIG. 1 and FIG. 3, the grindstone 5 can rotate in the B direction (both forward and reverse directions) around the grindstone rotation axis 5a, and can rotate in the A direction (both forward and reverse directions) around the grindstone angle rotation axis 5b. With such a configuration of the grindstone column 3, the grindstone head 32 can move and rotate in the X, Y, Z, and A directions. In the grindstone column 3, the grindstone 5 is provided on the surface facing the turntable 4, and the grindstone rotation shaft 5a is disposed adjacent to the turntable 4. The grindstone column 3, the grindstone moving device 31, and each motor (not shown) that drives the grindstone rotation shaft 5a are contained in the bed 2, and are controlled by the control unit 10.

[0019] The turntable 4 is a substantially cylindrical member having a circular upper surface. In this embodiment, the turntable 4 is provided adjacent to the grindstone column 3 in the X-axis direction. The turntable 4 has a table rotation axis 4a extending in a direction perpendicular to the grindstone rotation axis 5a, and is rotatable around the table rotation axis 4a. In this embodiment, the table rotation axis 4a extends in the Z-axis direction. As shown in FIGS. 1 and 2, the turntable 4 is rotatable in the C1 direction (both forward and reverse directions) around the table rotation axis 4a. A motor 40 that drives the table rotation axis 4a is housed in the turntable 4 and in the bed 2.

[0020] The turntable 4 is provided with two workpiece processing sections 41, 41, a grinding wheel housing section 42, and a dressing section 43. The workpiece processing section 41, the grinding wheel housing section 42, and the dressing section 43 move on the same rotational orbit as the turntable 4 rotates. A work column 7 is erected on the upper surface of the turntable 4. The workpiece processing sections 41, 41, the grinding wheel housing section 42, and the dressing section 43 are partitioned by the work column 7. Note that a part of the work column 7 is omitted in Figures 2 and 3. Note that in the gear grinding machine 1 of the present invention, the installation of the grinding wheel housing section 42 is optional.

[0021] Specifically, the work column 7 has a pillar section 71 that stands substantially in the center of the turntable 4 and houses the table rotation shaft 4a, and four partition walls 72 that extend radially from the pillar section 71 and divide the turntable 4 into four areas. The workpiece processing sections 41, 41, the grindstone housing section 42, and the dressing section 43 are each divided by the partition walls 72. The work column 7 is also provided with a tailstock 70 that holds down the workpieces 11, 12 from above in the vertical direction (W direction). Note that the tailstock 70 is omitted in Figs. 2 and 3.

[0022] The partition wall 72 extends from the column portion 71 radially outward of the turntable 4 and also extends in the Z-axis direction from the upper surface of the turntable 4. As shown in Fig. 2, the cover 100 covering the outer periphery of the gear grinding machine 1 has a cover partition wall 102 extending in the Y-axis direction from its inner surface toward the turntable 4 between the table rotation shaft 4a and the grinding wheel rotation shaft 5a, and the cover partition wall 102 can be connected to the partition wall 72 on the turntable 4. By providing the partition wall 72 so as to separate at least the workpiece processing section 41 and the grinding wheel housing section 42, for example, an operator can open the work door 101 during grinding of the workpiece 11 and safely replace a grinding wheel in the grinding wheel housing section 42, thereby improving the efficiency of the work.

[0023] The workpiece processing unit 41 can rotate around the table rotation shaft 4a with the rotation of the table rotation shaft 4a. The workpiece processing unit 41 has a plurality of workpiece rotation shafts 7a that are provided so as to pass through the rotary table 4. The workpiece rotation shafts 7a extend in the same direction as the table rotation shaft 4a, that is, in the Z-axis direction. The workpiece rotation shafts 7a are disposed radially outward of the table rotation shaft 4a. In this embodiment, the two workpiece rotation shafts 7a, 7a are disposed on opposite sides of the table rotation shaft 4a. The table rotation shaft 4a holds the workpieces 11, 12 at its upper end in a rotatable and detachable manner. The workpieces 11, 12 can rotate around the table rotation shaft 4a with the rotation of the table rotation shaft 4a. In addition, the workpieces 11, 12 can rotate in the C2 and C3 directions (both forward and reverse directions) around the workpiece rotation shaft 7a, as shown in FIG. 2. Above the workpiece processing unit 41, a tailstock 70 is provided so as to be movable in the vertical direction (W direction). The tail stocks 70 are provided facing the workpieces 11, 12 attached to the workpiece rotation shaft 7a. The tail stocks 70 press the workpieces 11, 12 from above toward the rotary table 4, and hold the workpieces 11, 12 together with the workpiece rotation shaft 7a.

[0024] The grindstone housing 42 can rotate around the table rotation shaft 4a as the table rotation shaft 4a rotates. The grindstone housing 42 is provided on the turntable 4. Specifically, the grindstone housing 42 is provided radially inward from the periphery of the turntable 4 so that the turntable 4 can accommodate the grindstone 5. The grindstone housing 42 can accommodate at least two grindstones 5. The grindstone 5 accommodated in the grindstone housing 42 is a replacement grindstone, which is a grindstone removed from the grindstone rotation shaft 5a after processing, and a new grindstone to replace the worn grindstone. In this embodiment, two grindstone housings 42 are arranged side by side in the Z-axis direction. In the grindstone housing 42, a grindstone transport device 8 is provided radially inward from the periphery of the turntable 4. By providing the grindstone transport device 8 on the inside of the turntable 4 rather than on the outside, the operating distance can be made shorter than when the grindstone transport device 8 is provided on the outside, so that the size of the device can be more effectively prevented.

[0025] Specifically, the grindstone conveying device 8 is provided on the column portion 71. A plurality of grindstone conveying devices 8 are provided according to the number of grindstones accommodated in the grindstone storage section 42, and each of them can hold the grindstone 5. The grindstone conveying device 8 is configured to perform a removal operation and an attachment operation of the grindstone 5 with respect to the grindstone rotation shaft 5a. The grindstone conveying device 8 can advance and retreat between the grindstone storage section 42 and the grindstone rotation shaft 5a. In the conventional gear grinding machine, the grindstone rotation shaft 5a can move and rotate in the X, Y, Z, and A directions due to the configuration of the grindstone column 3 as described above. Since the grindstone rotation shaft 5a moves and rotates so as to be able to receive or remove the grindstone of the grindstone conveying device 8, it is sufficient that the grindstone conveying device 8 can advance and retreat at least between the grindstone storage section 42 and the grindstone rotation shaft 5a. Since it is only necessary to have at least a drive device for conveying the grindstone in one direction, the cost of introducing the grindstone conveying device 8 can be reduced, and the gear grinding machine can be prevented from becoming large in size.

[0026] Specifically, the grindstone transport device 8 has a grindstone transport arm extending radially outward from the pillar portion 71. The grindstone transport device 8 can place or clamp the grindstone 5 on the grindstone transport arm. In this embodiment, as shown in Figs. 1 to 3, the grindstone transport arm holds the grindstone so that the rotation axis of the grindstone is vertical, but the grindstone may be held so that the rotation axis of the grindstone is horizontal. The grindstone transport arm can move radially outward from the pillar portion 71. In other words, when the grindstone storage portion 42 is located in front of the grindstone rotation shaft 5a, the grindstone transport arm can move forward and backward between the grindstone storage portion 42 and the grindstone rotation shaft 5a. The grindstone transport device 8 configured to be able to move forward and backward in this manner can also transport the grindstone to the outside of the cover 100 of the gear grinding machine 1. 2, the grindstone transport arm extends from the pillar 71 toward the work door 101 and can move between the inside and outside of the cover 100 via the work door 101. Since the worker can replace the grindstone 52 exposed to the outside of the work door 101 by the grindstone transport arm, the workability is far superior to replacing the grindstone inside the cover 100.

[0027] In this embodiment, two grinding wheel transport devices 81, 82 are provided in the grinding wheel housing 42 to house two grinding wheels 5, but for example, one grinding wheel transport device 81 can hold a new replacement grinding wheel 52, and the other grinding wheel transport device 82 can be left with a space to house the worn grinding wheel 51. In this state, after the grinding wheel housing 42 is positioned in front of the grinding wheel rotation shaft 5a by the rotation of the table rotation shaft 4a after the processing of the workpiece 11 is completed, the empty grinding wheel transport device 82 advances toward the grinding wheel rotation shaft 5a, and the grinding wheel column 3 and the grinding wheel head 32 move and rotate the grinding wheel rotation shaft 5a in the X, Y, Z, and A directions, so that the worn grinding wheel 51 can be placed on the grinding wheel transport device 82. Then, the grindstone transport device 82 carrying the worn grindstone 51 moves backward, and the grindstone transport device 81 carrying the new grindstone 52 moves forward toward the grindstone rotation shaft 5a, making it possible to attach the new grindstone 52 to the grindstone rotation shaft 5a. In this way, it is possible to efficiently remove the worn grindstone 51 and attach the new grindstone 52 without rotating the turntable 4.

[0028] The dressing unit 43 can rotate about the table rotation shaft 4a as the table rotation shaft 4a rotates. The dressing unit 43 is provided on the rotary table 4. A dressing device 6 for dressing the grindstone 51 attached to the grindstone rotation shaft 5a is disposed in the dressing unit 43. The dressing device 6 includes a dresser rotation shaft 6a extending in a direction parallel to the grindstone rotation shaft 5a (Y-axis direction) with the dressing unit 43 positioned in front of the grindstone rotation shaft 5a.

[0029] When the turntable 4 rotates around the table rotation axis 4a, the workpiece processing sections 41, 41, the grindstone housing section 42, and the dressing section 43 revolve around the table rotation axis 4a. In this embodiment, the turntable 4 is divided into four areas, each divided by 90°. Therefore, for example, as shown in FIG. 2, when one of the workpiece processing sections 41 is located in front of the grindstone rotation axis 5a, when the table rotation axis 4a rotates 90° clockwise, the dressing device 6 is located in front of the grindstone rotation axis 5a, and the dressing device 6 can dress the grindstone 51.

[0030] The measuring device 20 is provided outside the rotating table 4 so as to be able to measure the dimensions of the workpieces 11, 12 attached to the workpiece rotation shaft 7a. The measuring device 20 is an OBD measuring device that measures the overball diameter of the gears as the workpieces 11, 12. The measuring device 20 includes a pair of probes 21, 21, an arm unit 22 that supports the probes 21, a main unit 23 that moves the arm unit 22 in the horizontal direction, and a gauge 24. For example, an electric micrometer or a dial gauge can be used as the gauge. When one workpiece processing unit 41A and the grindstone rotation shaft 5a face each other, and the workpiece 11 is being processed by the grindstone 51 as shown in Figs. 1 to 3, for example, the measuring device 20 is provided at a position facing the other workpiece processing unit 41B so as to be able to measure the dimensions of the workpiece 12 installed in the other workpiece processing unit 41B.

[0031] The main body 23 is fixed to the upper surface of the bed 2 and includes a pair of arms 22, 22 spaced apart from each other in the horizontal direction. In this embodiment, the measuring device 20 is disposed at one end in the X-axis direction so as to face the grindstone column 3 across the rotary table 4, and is disposed between the work door 101 and the rotary table 4. The measuring device 20 is provided at a position where the workpieces 11, 12 are attached and detached. The main body 23 extends in the Y-axis direction and includes a pair of arms 22, 22 spaced apart from each other in the Y-axis direction. The arm 22 extends from the outside of the rotary table 4 toward the inside of the rotary table 4. The pair of arms 22, 22 are movable in the Y-axis direction so as to approach and move away from each other. A substantially spherical measuring probe 21 is fixed to the tip of the pair of arms 22, protruding in a direction facing each other. The measuring device 20 brings the measuring probe 21 into contact with the workpiece 12 attached to the workpiece rotation shaft 7a, and measures the OBD measurement value. The measuring instrument 20 inputs the obtained OBD measurement values ​​to the control unit.

[0032] The gear grinding machine 1 may include a workpiece exchanger 9 adjacent to the rotary table 4. The workpiece exchanger 9 is shown only in FIG. 2 and is omitted in FIG. 1 and FIG. 3. As shown in FIG. 2, the workpiece exchanger 9 is provided so as to be able to exchange a workpiece at a position where the measuring device 20 measures the workpiece. The workpiece exchanger 9 has a transfer rotation shaft 9a and a plurality of workpiece transfer arms 91, 92. The workpiece exchanger 9 is rotatable about the transfer rotation shaft 9a. The transfer rotation shaft 9a extends in the same direction as the table rotation shaft 4a, that is, in the Z-axis direction. The transfer rotation shaft 9a is provided outside the cover 100. The workpiece transfer arms 91, 92 extend horizontally from the transfer rotation shaft 9a, and in this embodiment, the two workpiece transfer arms 91, 92 are provided on both sides of the transfer rotation shaft 9a. As shown in FIG. 2, the workpiece transfer arms 91, 92 are rotatable in C4 (both forward and reverse directions) about the transfer rotation shaft 9a. The work transport arms 91, 92 can move in and out of the cover 100 through the working door 101 by rotating around the transport rotation shaft 9a. The work transport arms 91, 92 can hold the workpieces 12, 13 at their ends, and can detach and attach the workpieces 12, 13 to and from the work rotation shaft 7a.

[0033] Next, the operation of the gear grinding machine 1 will be described. The workpiece processing unit 41B and the grinding wheel rotation shaft 5a face each other, and the workpiece 12 placed on the workpiece processing unit 41B is processed by the grinding wheel 51. The workpiece processing unit 41B on which the processed workpiece 12 is placed turns to a position facing the measuring device 20 with the rotation of the table rotation shaft 4a. When the workpiece 12 arrives at the position facing the measuring device 20, the arms 22, 22 of the measuring device 20 move in a direction approaching each other, and the measuring probes 21, 21 are brought into contact with the outer periphery of the workpiece 12 so as to sandwich the workpiece 12, thereby measuring the OBD value. The measuring device 20 inputs the obtained OBD value to the control unit 10. The control unit 10 compares the OBD measurement value input from the measuring device 20 with a preset OBD reference value. If the difference between the OBD measurement value and the OBD reference value is within an allowable range, the workpiece exchange device 9 exchanges the processed workpiece 12 with an unprocessed workpiece 13. If the difference between the OBD measurement value and the OBD reference value is outside the allowable range, the table rotation axis 4a rotates, and the workpiece processing unit 41B, with the workpiece 12 still placed thereon, is again rotated to a position facing the grindstone rotation axis 5a. The control unit 10 controls various driving devices of the gear grinding machine, such as the driving motor of the grindstone rotation axis 5a and the driving motor of the workpiece rotation axis 7a, by feedback control, and performs run-in processing so that the workpiece 12 approaches the OBD reference value, thereby improving manufacturing efficiency and stabilizing the processing dimensions. It is also possible to process another workpiece 11 while the measuring device 20 is measuring the workpiece 12.

[0034] (Action and effect) The gear grinding machine 1 of this embodiment configured as described above can measure the overball diameter of the workpiece attached to the workpiece rotation shaft 7a, so there is no need to remove the workpiece for measurement. Even if the measurement result indicates that the dimensions do not meet the standard and re-grinding is required, the turntable 4 can be rotated to move the workpiece to a position where grinding is possible, and the in-feed machining can be started immediately, reducing the number of inspection steps. In addition, the turntable 4 is provided with multiple workpiece machining sections 41, and while one workpiece machining section 41A is grinding the workpiece 11, another workpiece machining section 41B can measure the machined workpiece 12. This means that the measurement time does not affect the cycle time, resulting in good manufacturing efficiency.

[0035] Second embodiment Next, a second embodiment of the gear grinding machine will be described with reference to FIG. 4. FIG. 4 is a schematic plan view of the gear grinding machine of the second embodiment. In the following description, the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description will be omitted. In the second embodiment, the positions of the measuring device 20 and the workpiece exchange device 9, and the arrangement on the rotary table 4 are different from those of the first embodiment. In the second embodiment, the two workpiece processing units 41A and 41B are provided adjacent to each other with a partition wall 72 interposed therebetween. As shown in FIG. 4, the measuring device 20 can measure the dimensions of the workpiece 12 placed on the other workpiece processing unit 41B when the workpiece 11 is being processed by the grindstone 51, with the workpiece processing unit 41A facing the grindstone rotation shaft 5a. In this embodiment, the grindstone rotation shaft 5a is located at a position moved 90 degrees from the measuring device 20 around the table rotation shaft 4a. The measuring device 20 is provided at a position between the working door 101 and the rotary table 4 where the workpieces 11 and 12 are attached and detached. In the gear grinding machine of the second embodiment, the same effects as those of the first embodiment can be obtained.

[0036] (Other embodiments) In the above embodiment, the two grindstone housings 42 are arranged side by side in the Z-axis direction, but the number of grindstone housings may be three or more, and the arrangement is not limited to the Z-axis direction. Also, in the above embodiment, the measuring device is an OBD measuring device, but it may be another measuring device such as a straddling tooth thickness measuring device. [Explanation of symbols]

[0037] 1 Gear grinding machine 2 beds 3 Grindstone column 4 Rotating table 4a Table rotation axis 5. Grindstone 5a Grindstone rotating shaft 5b Grindstone angle rotation axis 6 Dressing device 6a Dresser rotation axis 7 Work Column 7a Work rotation axis 8 Grindstone transport device 9 Work exchange device 9a Conveyor rotation axis 10 Control section 11, 12, 13 Work 20 Measuring instrument (OBD measuring instrument) 31 Grindstone moving device 32 Grindstone head 41, 41A, 41B Workpiece processing section 42 Grindstone storage section 43 Dressing Department 51,52 Grindstone 81,82 Grindstone transport device 91,92 Work transfer arm 100 Cover 101 Working door 102 Cover bulkhead

Claims

1. A grindstone rotation shaft capable of rotating the grindstone; a rotary table having a table rotation axis adjacent to the grindstone rotation axis and extending in a direction intersecting the grindstone rotation axis, the rotary table being rotatable about the table rotation axis; At least two workpiece machining units each having a workpiece rotation axis provided on the rotary table, capable of rotating around the table rotation axis and rotating a workpiece around the workpiece rotation axis; a measuring device provided outside the rotary table so as to be capable of measuring the dimensions of the workpiece attached to the workpiece rotation shaft; The measuring instrument is a measuring instrument for measuring the dimensions of a gear as the workpiece, and has a measuring probe at the end of an arm portion extending toward the inside of the rotating table, and is configured to be able to measure by bringing the measuring probe into contact with a gear attached to the workpiece rotation shaft.

2. 2. The gear grinding machine according to claim 1, characterized in that when one of the workpiece processing units and the grinding wheel rotation shaft are opposed to each other, the measuring device faces the other of the workpiece processing units so as to be able to measure the dimensions of a workpiece placed on the other of the workpiece processing units.

3. 3. The gear grinding machine according to claim 1, further comprising a control unit that compares the measurement value input from the measuring device with a preset reference value and controls the gear grinding machine by feedback control based on the comparison result.

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