Grinding tool dressing method and grinding device

Abstract

The invention provides a dressing method of a grinding tool and a grinding device. A dressing method for a grinding tool (14) has: an information acquisition step for acquiring information indicating run-out waveforms (100a, 100b) indicating run-out of a first tooth surface (112) for each rotational phase of a first rotating body (110), a data acquisition step for acquiring data indicating run-out waveforms (100a, 100b) indicating run-out of a second tooth surface (112) for each rotational phase of the first rotating body (110), and a dressing step for dressing the first tooth surface (112); a data acquisition step for acquiring, as contact position data (102a, 102b) at which the first tooth surface and the second tooth surface are in contact, envelope lines passing from a plurality of vertices on the side closer to the second tooth surface (116) in the run-out waveform; in the dressing step, the grinding tooth surface (66) is dressed by the dressing tooth surface (62) by changing the rotational speed of the first rotating body on the basis of the predetermined molding amount and the contact position data. Therefore, a better grinding tool dressing method and a better grinding device can be provided.

Description

Technical Field

[0001] The invention relates to a dressing method for a grinding tool and a grinding device. Background Art

[0002] Japanese Patent Application No. 5367085 discloses a dressing method for a grinding tool, wherein the grinding tool is meshed and rotated with a dresser gear, and the helical grinding tooth surface of the grinding tool is dressed using the dresser tooth surface of the dresser gear. Summary of the Invention

[0003] A better dressing method and grinding device for grinding tools are desired.

[0004] The purpose of the present invention is to solve the above-mentioned technical problems.

[0005] The first embodiment of the present invention is a dressing method for a grinding tool, which uses the dressing tooth surface of a dressing gear to dress the spiral grinding tooth surface of the grinding tool, wherein one of the grinding tool and the dressing gear is a first rotating body, and the first rotating body has a first tooth surface as one of the grinding tooth surface and the dressing tooth surface, and the other of the grinding tool and the dressing gear is a second rotating body, and the second rotating body has a second tooth surface as the other of the grinding tooth surface and the dressing tooth surface, and the dressing method includes an information acquisition step, a data acquisition step and a dressing step, wherein in the information acquisition step, the first tooth surface is meshed with the dressing tooth surface in a state where the first rotating body and the second rotating body are meshed and rotated. The rotation speed of the first rotating body is changed in a manner that the second tooth surface contacts and information related to the jitter waveform is obtained, wherein the jitter waveform represents the jitter of the first tooth surface in each rotation phase of the first rotating body; in the data acquisition step, the envelope line passing through multiple vertices on the side close to the second tooth surface in the jitter waveform obtained by the information acquisition step is obtained as contact position data of the contact between the first tooth surface and the second tooth surface; in the dressing step, the rotation speed of the first rotating body is changed according to a predetermined forming amount and the contact position data while the first rotating body and the second rotating body are engaged and rotated, and the grinding tooth surface is dressed using the dressing tooth surface.

[0006] The second aspect of the present invention is a grinding device that can dress the spiral grinding tooth surface of a grinding tool using the dressing tooth surface of a dressing gear, wherein one of the grinding tool and the dressing gear is a first rotating body, and the first rotating body has a first tooth surface that serves as one of the grinding tooth surface and the dressing tooth surface, and the other of the grinding tool and the dressing gear is a second rotating body, and the second rotating body has a second tooth surface that serves as the other of the grinding tooth surface and the dressing tooth surface, and the grinding device includes a rotation control unit, an information acquisition unit, and a data acquisition unit, wherein the rotation control unit rotates the first tooth surface and the second tooth surface in a state where the first rotating body and the second rotating body are meshed and rotated. The rotation speed of the first rotating body is changed in a face-to-face contact manner; the information acquisition unit acquires information related to the jitter waveform, and the jitter waveform represents the jitter of the first tooth surface in each rotation phase of the first rotating body; the data acquisition unit obtains an envelope line passing through multiple vertices on the side close to the second tooth surface in the jitter waveform acquired by the information acquisition unit as contact position data of the contact between the first tooth surface and the second tooth surface, and the rotation control unit changes the rotation speed of the first rotating body according to a predetermined forming amount and the contact position data while causing the first rotating body and the second rotating body to rotate in meshing engagement, and uses the dressing tooth surface to dress the grinding tooth surface.

[0007] According to the present invention, a better grinding tool dressing method and grinding apparatus can be provided.

[0008] The above-mentioned objects, features and advantages will be easily understood through the following description of the embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a perspective view of a grinding device according to an embodiment.

[0010] Figure 2 It is the control block diagram of the grinding device.

[0011] Figure 3 This is a flowchart showing an example of a dressing method for a grinding tool.

[0012] Figure 4 This is a flowchart showing an example of a dressing method for a grinding tool.

[0013] Figure 5 It is a graph showing the runout waveform of the left dresser tooth surface.

[0014] Figure 6 It is a graph showing the runout waveform of the right dresser tooth surface. DETAILED DESCRIPTION

[0015] In the dressing method of a grinding tool, if axial misalignment occurs when the dresser gear is mounted on the gear mounting shaft of the grinding device, the dresser gear may wobble during rotation. In this case, the grinding tooth surface may not be dressed by dressing the tooth surface.

[0016] As a method for solving this problem, for example, the following grinding tool dressing method can be considered. This grinding tool dressing method includes, for example, a first step, a second step, and a dressing step. In the first step, while the grinding tool is meshing and rotating with the dresser gear, the rotational speed of the dresser gear is changed so that the grinding tooth surface contacts the dresser tooth surface, and a runout waveform is obtained. This runout waveform represents the runout of the dresser tooth surface at each rotational phase of the dresser gear.

[0017] In the second step, a line in the runout waveform that passes through the average value of the runout for each rotational phase of the dresser gear is acquired as reference position data. Furthermore, in the second step, the forming amount (advance data) is added to the reference position data to acquire dressing position data. In the dressing step, while the grinding tool is meshing and rotating with the dresser gear, the rotational speed of the dresser gear is changed according to the dressing position data, thereby dressing the grinding tooth surface using the dresser tooth surface. This method enables dressing of the grinding tooth surface even in the event of axial misalignment between the gear mounting shaft and the dresser gear, for example.

[0018] Furthermore, the dresser tooth surfaces contain abrasive grains used to dress the ground tooth surfaces. The distribution of the abrasive grains on the dresser tooth surfaces is uneven. This uneven distribution manifests itself as uneven amplitude in the runout waveform. Furthermore, when the dresser gear's rotational speed is changed, the circumferential speed increases as the outer diameter of the dresser gear increases. Therefore, the amplitude of the runout waveform varies depending on the size and shape of the dresser gear.

[0019] In the method of obtaining dressing position data by adding the forming amount to reference position data passing through the average value of the runout waveform for each rotation phase of the dresser gear, the grinding tooth surface may not be accurately dressed due to the influence of the amplitude variation of the runout waveform.

[0020] The present invention can provide a grinding tool dressing method and a grinding device capable of dressing a grinding tooth surface with high precision without being affected by the uneven amplitude of a runout waveform.

[0021] Figure 1 : is a perspective view of the grinding device 10 according to the embodiment. Figure 1 As shown, the grinding device 10 is a device for dressing a grinding tool 14 using a dressing gear 12. The grinding tool 14 can be used to grind a workpiece gear (not shown) using the dressed grinding tool 14.

[0022] like Figure 1 As shown, the grinding device 10 includes a bed 16 , a gear support mechanism 18 , a gear rotation mechanism 20 , a tool support mechanism 22 , a tool rotation mechanism 24 , and a control device 26 .

[0023] The base 16 is placed on a horizontal surface in a factory, etc. The gear support mechanism 18 is arranged on the flat upper surface of the base 16. The gear support mechanism 18 includes a feed table 28, a feed motor 30, a traverse table 32, and a traverse motor 34.

[0024] The feed table 28 moves in the direction A relative to the base 16. The direction A is a horizontal direction perpendicular to the height direction of the base 16. The feed table 28 is connected to the feed motor 30 via a ball screw shaft 36. The feed motor 30 moves the feed table 28 in the direction A by rotating the ball screw shaft 36.

[0025] The traverse table 32 is disposed on the upper surface of the feed table 28. The traverse table 32 moves relative to the feed table 28 in the B direction. The B direction is perpendicular to the height direction of the base 16 and the A direction. The traverse table 32 is connected to the traverse motor 34 via a ball screw shaft (not shown). The traverse motor 34 rotates the ball screw shaft to move the traverse table 32 in the B direction.

[0026] The gear rotation mechanism 20 is disposed on the upper surface of the traverse table 32. The gear rotation mechanism 20 includes a gear mounting shaft 38 and a first motor 40. The gear mounting shaft 38 extends in the direction B. The dresser gear 12 is attachable to and detachable from the gear mounting shaft 38. Alternatively, a workpiece gear (not shown) may be attached to the gear mounting shaft 38 in place of the dresser gear 12. The first motor 40 rotates the gear mounting shaft 38.

[0027] The tool support mechanism 22 includes a column 42, a rotary table 44, a shift table 46, and a shift motor 48. The column 42 is disposed on the upper surface of the base 16 so as to face the gear support mechanism 18. The column 42 extends upward from the base 16. The rotary table 44 is mounted on the surface of the column 42 facing the gear support mechanism 18.

[0028] The rotary table 44 extends in one direction. A rotary motor (not shown) rotates the rotary table 44 in the direction C relative to the column 42. A displacement table 46 is provided on the surface of the rotary table 44 that faces the gear support mechanism 18. The displacement table 46 is connected to a displacement motor 48 via a ball screw shaft 50. The displacement motor 48 is mounted on the rotary table 44. The displacement motor 48 moves the displacement table 46 in the direction D relative to the rotary table 44.

[0029] The tool rotation mechanism 24 includes a base 54, a tool mounting shaft 56, and a second motor 58. The base 54 is mounted on the surface of the displacement table 46 that faces the gear support mechanism 18. The base 54 extends in the direction in which the rotation table 44 extends. The tool mounting shaft 56 penetrates the base 54 in the direction in which the base 54 extends. The grinding tool 14 is attachable to and detachable from the tool mounting shaft 56. The second motor 58 rotates the tool mounting shaft 56.

[0030] like Figure 2 As shown, the dresser gear 12 is mounted on the gear mounting shaft 38. The dresser gear 12 can rotate in the R1 direction and the R2 direction by the driving force of the first motor 40. The dresser gear 12 is a gear used to dress the grinding tool 14. The dresser gear 12 has a plurality of dresser teeth 60. Each of the plurality of dresser teeth 60 has a dresser tooth surface 62 formed thereon. The dresser tooth surface 62 includes a left dresser tooth surface 62a and a right dresser tooth surface 62b. Diamond abrasive grains, for example, are electrodeposited on the dresser tooth surfaces 62 by nickel plating.

[0031] The grinding tool 14 is mounted on the tool mounting shaft 56. The grinding tool 14 can rotate in the R3 direction and the R4 direction by the driving force of the second motor 58. The grinding tool 14 is a tool for grinding a workpiece gear (not shown). The grinding tool 14 has spiral grinding teeth 64. A grinding tooth surface 66 is formed on the grinding tooth 64. The grinding tooth surface 66 includes a first grinding tooth surface 66a and a second grinding tooth surface 66b. On the grinding tooth surface 66, a single layer of CBN (cubic boron nitride) abrasive grains is electrodeposited, for example, by nickel plating.

[0032] When the dressing gear 12 is used to dress the grinding tool 14, the dressing gear 12 is meshed with the grinding tool 14. When the dressing gear 12 and the grinding tool 14 are meshed, the left dressing tooth surface 62a faces the first grinding tooth surface 66a, and the right dressing tooth surface 62b faces the second grinding tooth surface 66b. When the dressing gear 12 and the grinding tool 14 are meshed, the left dressing tooth surface 62a can dress the first grinding tooth surface 66a by rotating the dressing gear 12 in the R1 direction and the grinding tool 14 in the R3 direction. When the dressing gear 12 and the grinding tool 14 are meshed, the right dressing tooth surface 62b can dress the second grinding tooth surface 66b by rotating the dressing gear 12 in the R2 direction and the grinding tool 14 in the R4 direction.

[0033] The grinding device 10 further includes a first encoder 68, a second encoder 70, and a contact sensor 72. The first encoder 68 is provided on the first motor 40. The first encoder 68 outputs information (e.g., a pulse signal) related to the rotation phase (rotation speed, rotation angle, rotation position, rotation amount) of the dresser gear 12 to the control device 26.

[0034] The second encoder 70 is provided on the second motor 58 . The second encoder 70 outputs information (eg, a pulse signal) on the rotation phase (rotation speed, rotation angle, rotation position, rotation amount) of the grinding tool 14 to the control device 26 .

[0035] The contact sensor 72 detects the contact between the dressing tooth surface 62 and the grinding tooth surface 66. The contact sensor 72 is mounted on a bearing (not shown) that rotatably supports the gear mounting shaft 38. The contact sensor 72 is, for example, an AE (Acoustic Emission) sensor. The AE sensor detects the elastic wave (contact sound) generated when the dressing tooth surface 62 and the grinding tooth surface 66 come into contact. The contact sensor 72 is not limited to an AE sensor. The contact sensor 72 may be, for example, a vibration sensor, a torque sensor, or the like. In addition, the contact between the grinding tool 14 and the dressing gear 12 can be detected based on the retention pulse described in Japanese Patent Gazette No. 3910427.

[0036] The control device 26 includes a first servo amplifier 74, a second servo amplifier 76, and a control main unit 78. The first servo amplifier 74 controls the rotation of the first motor 40 based on a signal output from the control main unit 78. The second servo amplifier 76 controls the rotation of the second motor 58 based on a signal output from the control main unit 78.

[0037] The control main unit 78 includes a computing unit 80, a storage unit 82, an operating unit 84, and a display unit 86. The computing unit 80 is composed of a processor such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit). In other words, the computing unit 80 is composed of processing circuitry.

[0038] The computing unit 80 includes a control unit 88, a rotation control unit 90, an information acquisition unit 92, and a data acquisition unit 94. The control unit 88 controls the feed motor 30, the traverse motor 34, the rotation motor (not shown), and the displacement motor 48. The rotation control unit 90 controls the rotation of the dresser gear 12 via the first servo amplifier 74. Furthermore, the rotation control unit 90 controls the rotation of the grinding tool 14 via the second servo amplifier 76.

[0039] The control unit 88, the rotation control unit 90, the information acquisition unit 92, and the data acquisition unit 94 can be implemented by the calculation unit 80 executing a program stored in the storage unit 82. Furthermore, at least a portion of the control unit 88, the rotation control unit 90, the information acquisition unit 92, and the data acquisition unit 94 can be implemented by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array). Furthermore, at least a portion of the control unit 88, the rotation control unit 90, the information acquisition unit 92, and the data acquisition unit 94 can be formed by an electronic circuit including discrete components.

[0040] The storage unit 82 is composed of a volatile memory (not shown) and a non-volatile memory (not shown). Examples of volatile memory include RAM (Random Access Memory). Volatile memory is used as a working memory for the processor, temporarily storing data required for processing or calculations. Examples of non-volatile memory include ROM (Read Only Memory) and flash memory. Non-volatile memory is used as a storage memory for storing programs, tables, maps, etc. At least a portion of the storage unit 82 can be provided in the processor, integrated circuit, etc. described above.

[0041] The operating unit 84 is used by the user to operate the control device 26. Furthermore, the operating unit 84 may include a keyboard, a mouse, or the like. The display unit 86 includes a display element (not shown). Examples of such display elements include liquid crystal display elements and organic electroluminescent display elements. The operating unit 84 and the display unit 86 may be configured using a touch panel (not shown) having such a display element.

[0042] Next, an example of a dressing method for the grinding tool 14 will be described. Figure 3 and Figure 4 This is a flowchart showing an example of a dressing method for the grinding tool 14 .

[0043] In step S1, the dresser gear 12 is mounted on the gear mounting shaft 38, and the grinding tool 14 is mounted on the tool mounting shaft 56. Thereafter, the process proceeds to step S2.

[0044] In step S2, the dresser gear 12 is meshed with the grinding tool 14. Specifically, the control unit 88 controls the feed motor 30, the traverse motor 34, the rotation motor (not shown), and the displacement motor 48 to mesh the dresser gear 12 with the grinding tool 14. The process then proceeds to step S3.

[0045] In step S3, the dressing position data 104a of the first grinding tooth surface 66a is acquired (see Figure 5 ). That is, in Figure 4 In step S10, an information acquisition step is performed. In the information acquisition step, while the dresser gear 12 (first rotating body 110) and the grinding tool 14 (second rotating body 114) are engaged and rotated, the rotation speed of the dresser gear 12 is changed so that the left dresser tooth surface 62a (first tooth surface 112) and the first grinding tooth surface 66a (second tooth surface 116) come into contact with each other, and the information corresponding to the runout waveform 100a (refer to FIG. 10 is omitted). Figure 5 ), the runout waveform 100a represents the runout of the left dresser tooth surface 62a of each rotation phase of the dresser gear 12.

[0046] Specifically, the rotation control unit 90 controls the first motor 40 via the first servo amplifier 74 to rotate the dresser gear 12 in the R1 direction. Furthermore, the rotation control unit 90 controls the second motor 58 via the second servo amplifier 76 to rotate the grinding tool 14 in the R3 direction. Based on information output from the first encoder 68 and information output from the second encoder 70, the rotation control unit 90 performs feedback control on the first servo amplifier 74 and the second servo amplifier 76 so that the dresser gear 12 rotates while maintaining meshing with the grinding tool 14.

[0047] For example, if axial misalignment occurs between the dresser gear 12 and the gear mounting shaft 38, the left dresser tooth surface 62a of the dresser gear 12 will not stably contact the first grinding tooth surface 66a of the grinding tool 14. In other words, when the dresser gear 12 and the grinding tool 14 are rotated in meshing engagement, the left dresser tooth surface 62a comes into contact with or separates from the first grinding tooth surface 66a. Therefore, in this embodiment, the rotation control unit 90 changes the rotation speed of the dresser gear 12 so that the left dresser tooth surface 62a comes into contact with the first grinding tooth surface 66a. Furthermore, the rotation control unit 90 rotates the grinding tool 14 at a predetermined constant rotation speed.

[0048] The contact sensor 72 detects the elastic wave generated by the contact between the left trimmer tooth surface 62a and the first grinding tooth surface 66a and outputs it to the control main body 78. The control unit 88 determines whether the size of the elastic wave is within a predetermined contact range. The lower limit of the contact range can be set to a value slightly larger than the elastic wave in a state where the left trimmer tooth surface 62a and the first grinding tooth surface 66a are not in contact. The upper limit of the contact range can be set to a value slightly smaller than the elastic wave in a state where the left trimmer tooth surface 62a and the first grinding tooth surface 66a are in excessive contact. That is, if the size of the elastic wave output from the contact sensor 72 is within the contact range, the left trimmer tooth surface 62a and the first grinding tooth surface 66a are in moderate contact. In addition, the contact range can be set appropriately.

[0049] When the control unit 88 determines that the magnitude of the elastic wave output from the contact sensor 72 is smaller than the lower limit of the contact range, the rotation control unit 90 increases the rotation speed of the dresser gear 12. This causes the left dresser tooth surface 62a to move closer to the first grinding tooth surface 66a, thereby enabling the left dresser tooth surface 62a to be brought into moderate contact with the first grinding tooth surface 66a.

[0050] When the control unit 88 determines that the magnitude of the elastic wave output from the contact sensor 72 is greater than the upper limit of the contact range, the rotation control unit 90 reduces the rotation speed of the dresser gear 12. This causes the left dresser tooth surface 62a to move away from the first grinding tooth surface 66a, thereby enabling the left dresser tooth surface 62a to be brought into moderate contact with the first grinding tooth surface 66a.

[0051] In this manner, when the rotational speed of the dresser gear 12 is changed so that the left dresser tooth surface 62a contacts the first grinding tooth surface 66a, the runout of the left dresser tooth surface 62a is reflected in the information output from the first encoder 68. Therefore, the information acquisition unit 92 can acquire information regarding the runout waveform 100a indicating the runout of the dresser tooth surface 62 for each rotational phase of the dresser gear 12 based on the information output from the first encoder 68.

[0052] Figure 5 Graph showing the runout waveform 100a of the left trimmer tooth surface 62a. Figure 5 In the graph, the horizontal axis represents the rotational phase of the dresser gear 12, and the vertical axis represents the runout of the left dresser tooth surface 62a. In this embodiment, the information acquisition unit 92 acquires information regarding the runout waveform 100a for a full revolution of the dresser gear 12. The rotation of the dresser gear 12 and the grinding tool 14 is then temporarily stopped, and the process proceeds to step S11.

[0053] In step S11, a data acquisition step is performed. In the data acquisition step, as shown in FIG. Figure 5 As shown, an envelope passing through a plurality of vertices on the side close to the first ground tooth surface 66a in the runout waveform 100a acquired in the information acquisition step is acquired as contact position data 102a where the left dresser tooth surface 62a contacts the first ground tooth surface 66a.

[0054] In the data acquisition step, the rotational phase of the dresser gear 12 in the runout waveform 100a can be divided into a plurality of intervals (e.g., 128 intervals), and the runout amount at the position with the minimum phase in each interval can be extracted as a representative point. The contact position data 102a can be acquired based on these representative points. In this case, the data processing load is reduced, and thus the contact position data 102a can be acquired in a relatively short time.

[0055] In the data acquisition step, the predetermined forming amount is added to the contact position data 102a to acquire the trimming position data 104a. Figure 5 The contact position data 102a shown is slid toward the side close to the first grinding tooth surface 66a by an amount corresponding to the forming amount to obtain the dressing position data 104a of the first grinding tooth surface 66a. The forming amount is the amount of abrasive cutting of the first grinding tooth surface 66a and can be set appropriately. The forming amount is pre-stored in the storage unit 82. Afterwards, it is transferred to Figure 3 Step S4 (trimming step).

[0056] In step S4, the first grinding tooth surface 66a is dressed. Specifically, while the dresser gear 12 is rotating in mesh with the grinding tool 14, the rotational speed of the dresser gear 12 is changed based on the dressing position data 104a for the first grinding tooth surface 66a. This allows the left dresser tooth surface 62a to dress the first grinding tooth surface 66a. The first grinding tooth surface 66a is dressed throughout one revolution of the dresser gear 12. The process then proceeds to step S5.

[0057] In step S5, the dressing position data 104b of the second grinding tooth surface 66b is acquired (see Figure 6 The trimming position data 104b for the second ground tooth surface 66b can be acquired by performing the aforementioned processing of steps S10 and S11 between the right trimming tooth surface 62b and the second ground tooth surface 66b. The description of the portions overlapping with the description of acquiring the trimming position data 104a for the first ground tooth surface 66a will be omitted.

[0058] That is, in this case, in step S10, in the information acquisition step, the rotation speed of the dresser gear 12 is changed so that the right dresser tooth surface 62b (first tooth surface 112) and the second grinding tooth surface 66b (second tooth surface 116) come into contact with each other while the dresser gear 12 and the grinding tool 14 are engaged and rotated, and the information corresponding to the runout waveform 100b (see FIG. Figure 6 ), the runout waveform 100b represents the runout of the right dresser tooth surface 62b of each rotation phase of the dresser gear 12. Figure 6 Graph showing the runout waveform of the right dresser tooth surface 62 b.

[0059] In addition, in step S11, if Figure 6 As shown, the envelope of the right trimming tooth surface 62b's runout waveform 100b passing through a plurality of vertices on the side close to the second grinding tooth surface 66b is obtained as contact position data 102b where the right trimming tooth surface 62b contacts the second grinding tooth surface 66b. Figure 6The contact position data 102b shown is slid toward the side closer to the second ground tooth surface 66b by an amount corresponding to the forming amount, thereby obtaining dressing position data 104b for the second ground tooth surface 66b. The forming amount in this case refers to the amount of abrasive grain removal from the second ground tooth surface 66b and can be set as appropriate. The process then moves to step S6 (dressing step).

[0060] In step S6, the second grinding tooth surface 66b is dressed. Specifically, while the dressing gear 12 is engaged with the grinding tool 14 and rotates, the rotation speed of the dressing gear 12 is changed according to the dressing position data 104b of the second grinding tooth surface 66b, thereby using the right dressing tooth surface 62b to dress the second grinding tooth surface 66b. The dressing of the second grinding tooth surface 66b is performed over the entire circle of the dressing gear 12. After that, the process is completed. Figure 3 processing.

[0061] In this embodiment, in the data acquisition step, the trimming position data 104a and 104b may be acquired after the contact position data 102a and 102b are acquired. In this case, in the trimming step, for example, the rotation control unit 90 may change the rotation speed of the dresser gear 12 by referring to the contact position data 102a and 102b and the forming amount.

[0062] According to this embodiment, the envelope curve passing through multiple vertices on the side closest to the ground tooth surface 66 in the runout waveforms 100a and 100b of the dressed tooth surface 62 is obtained as contact position data 102a and 102b between the dressed tooth surface 62 and the ground tooth surface 66. This allows for highly accurate determination of the contact position data 102a and 102b (reference position) between the dressed tooth surface 62 and the ground tooth surface 66. In other words, the contact position data 102a and 102b are unaffected by variations in the amplitude of the runout waveforms 100a and 100b. Furthermore, by modifying the dresser gear 12 based on a predetermined forming amount and the contact position data 102a and 102b, the ground tooth surface 66 is dressed using the dressed tooth surface 62. This allows for highly accurate dressing of the ground tooth surface 66 without being affected by variations in the amplitude of the runout waveforms 100a and 100b. According to this, a better dressing method of the grinding tool 14 and the grinding device 10 can be provided.

[0063] In the above-described embodiment, the dresser gear 12 is a first rotating body 110 having a first tooth surface 112 serving as the dresser tooth surface 62. The grinding tool 14 is a second rotating body 114 having a second tooth surface 116 serving as the grinding tooth surface 66. The present invention is not limited to this configuration; for example, the grinding tool 14 may serve as the first rotating body 110, and the dresser gear 12 may serve as the second rotating body 114. In this case, in the information acquisition step, while the grinding tool 14 (first rotating body 110) and the dresser gear 12 (second rotating body 114) are meshed and rotated, the rotational speed of the grinding tool 14 is changed so that the grinding tooth surface 66 (first tooth surface 112) contacts the dresser tooth surface 62 (second tooth surface 116), and information related to runout waveforms 100a and 100b representing the runout of the grinding tooth surface 66 for each rotational phase of the grinding tool 14 is acquired. Furthermore, in the data acquisition step, envelopes passing through a plurality of vertices on the side close to the ground tooth surface 66 in the runout waveforms 100a and 100b acquired in the information acquisition step are acquired as contact position data 102a and 102b of the dressing tooth surface 62 and the ground tooth surface 66. Furthermore, in the dressing step, while the dressing gear 12 and the grinding tool 14 are meshed and rotated, the rotational speed of the grinding tool 14 is changed based on a predetermined forming amount and the contact position data 102a and 102b, thereby dressing the ground tooth surface 66 using the dressing tooth surface 62.

[0064] The following supplementary notes are further disclosed regarding the above-mentioned embodiment.

[0065] (Note 1) The dressing method of the grinding tool (14) of the present invention uses the dressing tooth surface (62) of the dressing gear (12) to dress the spiral grinding tooth surface (66) of the grinding tool, wherein one of the grinding tool and the dressing gear is a first rotating body (110), and the first rotating body (110) has a first tooth surface (112) as one of the grinding tooth surface and the dressing tooth surface, and the other of the grinding tool and the dressing gear is a second rotating body (114), and the second rotating body (114) has a second tooth surface (116) as the other of the grinding tooth surface and the dressing tooth surface. The dressing method includes an information acquisition step, a data acquisition step and a dressing step, wherein in the information acquisition step, while the first rotating body and the second rotating body are engaged and rotated, The rotation speed of the first rotating body is changed in such a manner that the first tooth surface contacts the second tooth surface, and information related to a jitter waveform (100a, 100b) is obtained, wherein the jitter waveform represents the jitter of the first tooth surface at each rotation phase of the first rotating body; in the data acquisition step, an envelope passing through a plurality of vertices on a side close to the second tooth surface in the jitter waveform acquired by the information acquisition step is acquired as contact position data (102a, 102b) of the contact between the first tooth surface and the second tooth surface; in the dressing step, the rotation speed of the first rotating body is changed according to a predetermined forming amount and the contact position data while the first rotating body and the second rotating body are engaged and rotated, and the grinding tooth surface is dressed using the dressing tooth surface.

[0066] According to this method, the envelope of the runout waveform of the first tooth surface passing through multiple vertices on the side close to the second tooth surface is obtained as the contact position data of the first tooth surface and the second tooth surface. Accordingly, the contact position data (reference position) of the first tooth surface and the second tooth surface can be grasped with high precision. That is, the contact position data is not affected by the uneven amplitude of the runout waveform. In addition, by changing the first gear according to the predetermined forming amount and contact position data, the grinding tooth surface is dressed using the dressing tooth surface. Accordingly, the grinding tooth surface can be dressed with high precision without being affected by the uneven amplitude of the runout waveform. Accordingly, a better dressing method for grinding tools can be provided.

[0067] (Note 2) In the grinding tool dressing method described in Supplementary Note 1, the first tooth surface of the first rotating body may be the dressing tooth surface of the dresser gear, and the second tooth surface of the second rotating body may be the grinding tooth surface of the grinding tool.

[0068] (Note 3) In the dressing method of the grinding tool described in Note 1 or 2, in the data acquisition step, the forming amount is added to the contact position data to obtain the dressing position data (104a, 104b), and in the dressing step, while the first rotating body and the second rotating body are engaged and rotated, the rotation speed of the first rotating body is changed according to the dressing position data, and the grinding tooth surface is dressed using the dressing tooth surface.

[0069] According to this method, by acquiring the dressing position data, the grinding tooth surface can be dressed using the dressing tooth surface through simple control.

[0070] (Note 4) The grinding device (10) of the present invention can use the dressing tooth surface of the dressing gear to dress the spiral grinding tooth surface of the grinding tool, wherein one side of the grinding tool and the dressing gear is a first rotating body, and the first rotating body has a first tooth surface as one side of the grinding tooth surface and the dressing tooth surface, and the other side of the grinding tool and the dressing gear is a second rotating body, and the second rotating body has a second tooth surface as the other side of the grinding tooth surface and the dressing tooth surface, and the grinding device has a rotation control part (90), an information acquisition part (92) and a data acquisition part (94), wherein the rotation control part rotates the first tooth surface with the second tooth surface in a state where the first rotating body and the second rotating body are meshed and rotated. The rotation speed of the first rotating body is changed in a manner that the second tooth surface contacts the first rotating body; the information acquisition unit acquires information related to the jitter waveform, and the jitter waveform represents the jitter of the first tooth surface in each rotation phase of the first rotating body; the data acquisition unit obtains the envelope line passing through multiple vertices on the side close to the second tooth surface in the jitter waveform acquired by the information acquisition unit as contact position data of the contact between the first tooth surface and the second tooth surface, and the rotation control unit changes the rotation speed of the first rotating body according to a predetermined forming amount and the contact position data while making the first rotating body mesh with the second rotating body and uses the dressing tooth surface to dress the grinding tooth surface.

[0071] According to such a configuration, it is possible to obtain a grinding device that achieves the same effects as those of Supplementary Note 1. Thus, a more favorable grinding device can be provided.

[0072] (Note 5) In the grinding device according to Supplementary Note 4, the first tooth surface of the first rotating body may be the dressing tooth surface of the dresser gear, and the second tooth surface of the second rotating body may be the grinding tooth surface of the grinding tool.

[0073] (Note 6) In the grinding device described in Note 4 or 5, the data acquisition unit may add the forming amount and the contact position data to obtain the dressing position data, and the rotation control unit may dress the grinding tooth surface using the dressing tooth surface by changing the rotation speed of the first rotating body according to the dressing position data while the first rotating body and the second rotating body are engaged and rotated.

[0074] The present invention has been described in detail, but the present invention is not limited to the above-mentioned embodiments. These embodiments can be supplemented, replaced, changed, partially deleted, etc. in a variety of ways without departing from the scope of the present invention or the scope of the present invention derived from the contents recorded in the technical solution and its equivalents. In addition, these embodiments can also be implemented in combination. For example, in the above-mentioned embodiment, the steps of each action or the steps of each processing are shown as an example and are not limited to these. In addition, the same applies to the cases where numerical values ​​or formulas are used in the description of the above-mentioned embodiment.

Claims

1. A method for dressing a grinding tool, wherein the dressing tooth surface of a dressing gear is used to dress the spiral grinding tooth surface of the grinding tool, wherein: One of the grinding tool and the dresser gear is a first rotating body, and the first rotating body has a first tooth surface that is one of the grinding tooth surface and the dresser tooth surface. The other of the grinding tool and the dresser gear is a second rotating body, and the second rotating body has a second tooth surface which is the other of the grinding tooth surface and the dresser tooth surface. The trimming method comprises an information acquisition step, a data acquisition step and a trimming step, wherein: In the information acquisition step, while the first rotating body and the second rotating body are meshed and rotated, the rotational speed of the first rotating body is changed so that the first tooth surface contacts the second tooth surface, and information related to a runout waveform is acquired, the runout waveform indicating the runout of the first tooth surface at each rotational phase of the first rotating body. In the data acquisition step, an envelope passing through a plurality of vertices on a side close to the second tooth surface in the runout waveform acquired in the information acquisition step is acquired as contact position data of the first tooth surface and the second tooth surface; In the dressing step, the grinding tooth surface is dressed by the dressing tooth surface by changing the rotation speed of the first rotating body according to the predetermined forming amount and the contact position data while the first rotating body and the second rotating body are rotated in meshing engagement.

2. The grinding tool dressing method according to claim 1, characterized in that: The first tooth surface of the first rotating body is the dressing tooth surface of the dresser gear. The second tooth surface of the second rotating body is the grinding tooth surface of the grinding tool.

3. The grinding tool dressing method according to claim 1, characterized in that: In the data acquisition step, the forming amount is added to the contact position data to acquire trimming position data, In the dressing step, the grinding tooth surface is dressed using the dressing tooth surface by changing the rotation speed of the first rotating body according to the dressing position data while the first rotating body and the second rotating body are rotated in meshing engagement.

4. A grinding device capable of dressing the spiral grinding tooth surface of a grinding tool by using the dressing tooth surface of a dressing gear, characterized in that: One of the grinding tool and the dresser gear is a first rotating body, and the first rotating body has a first tooth surface that is one of the grinding tooth surface and the dresser tooth surface. The other of the grinding tool and the dresser gear is a second rotating body, and the second rotating body has a second tooth surface which is the other of the grinding tooth surface and the dresser tooth surface. The grinding device includes a rotation control unit, an information acquisition unit, and a data acquisition unit, wherein: The rotation control unit changes the rotation speed of the first rotating body so that the first tooth surface contacts the second tooth surface while the first rotating body and the second rotating body are meshed and rotated. The information acquisition unit acquires information related to a runout waveform indicating a runout of the first tooth surface at each rotational phase of the first rotating body; The data acquisition unit acquires an envelope passing through a plurality of vertices on a side close to the second tooth surface in the runout waveform acquired by the information acquisition unit as contact position data of the first tooth surface and the second tooth surface. The rotation control unit dresses the grinding tooth surface with the dressing tooth surface by changing the rotation speed of the first rotating body according to a predetermined forming amount and the contact position data while the first rotating body and the second rotating body are meshed and rotated.

5. The grinding device according to claim 4, characterized in that The first tooth surface of the first rotating body is the dressing tooth surface of the dresser gear. The second tooth surface of the second rotating body is the grinding tooth surface of the grinding tool.

6. The grinding device according to claim 4, characterized in that The data acquisition unit acquires trimming position data by adding the forming amount to the contact position data. The rotation control unit dresses the grinding tooth surface using the dressing tooth surface by changing the rotation speed of the first rotating body according to the dressing position data while the first rotating body and the second rotating body are meshed and rotated.

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