Method for measuring the center position of the turntable and dressing wheel of a worm wheel gear grinding machine

Abstract

The present invention discloses a method for measuring the center position of a turntable and a dressing wheel of a worm wheel gear grinding machine, comprising the following steps: Step 1: aligning the grinding wheel spindle and the grinding wheel equivalent tooling position; Step 2: determining the center position of the turntable; Step 3: determining the center position of the dressing wheel. The present invention can be applied to the problem of accurately measuring the center position of the turntable and the dressing wheel in the face gear worm wheel gear grinding process, and the measurement method also has certain guiding significance for the assembly and production of gear making machine tools; the measuring tool only needs to use conventional tools such as a micrometer and a customized tooling, and does not involve a complex mathematical derivation and calculation process, and basically does not need to write a CNC program. The operator can carry out actual measurement work after being proficient in the use of the micrometer. Therefore, the measurement method involved in the present invention has the advantages of good versatility, high precision, low measurement cost and easy implementation.

Description

Technical Field

[0001] The invention relates to a gear grinding machine, in particular to a method for measuring the center position of a turntable and a dressing wheel of a worm grinding wheel gear grinding machine. Background Art

[0002] Gear grinding is commonly used in the field of precision machining of gears. Compared with profiled grinding wheel gear grinding machines, worm wheel gear grinding machines have the characteristics of high grinding efficiency and good stability, and have gradually become the mainstream product in the gear grinding machine market. The process of first trimming the profile of the worm wheel with a diamond roller and then performing precision gear grinding with the worm wheel must be realized by running a multi-axis linkage CNC program after completing the tool setting (or centering) operation.

[0003] In order to achieve high-efficiency and high-precision machining of gears, in the design and production assembly of CNC gear grinding machines, the rotation axis of the gear workpiece (C1 axis), the rotation axis of the grinding wheel turret (A1 axis) and the yaw axis of the dressing wheel (C2 axis) will be arranged as "three centers coplanar" as possible, that is, the Y-direction coordinates of the three are consistent. In the production and assembly process, another shaft component to be installed is often positioned by referring to a fixed reference axis, which requires high technical proficiency of the workers, but it cannot guarantee that the Y-direction positions of each axis are completely coincident, which is generally manifested as micron or even millimeter offset errors.

[0004] Since the worm wheel of the spur gear is a drum-shaped involute worm, during the grinding wheel tooth profile dressing, the center of the dressing wheel and the worm wheel are aligned up and down in the Z-axis direction, and the grinding wheel tool holder yaw axis (A1 axis) and the grinding wheel spindle (B1 axis) rotate synchronously at a fixed transmission ratio. Therefore, the position of the dressing wheel center (C2 axis) determines the correctness of the worm tooth profile. During the actual machine tool assembly, the Y-axis coordinates of the A1 axis, B1 axis and C2 axis axes are calibrated according to the C1 axis center. The deviation between the Y-axis coordinate of the C1 axis center and the theoretical value will cause the worm wheel to feed in the direction of the face gear tooth length through the C1 axis center, which does not meet the forming principle of the face gear and directly affects the correctness of the face gear tooth surface. Therefore, it is extremely critical to accurately measure the position of the C1 axis and C2 axis axes in the y direction.

[0005] Since the determination of the actual axis coordinate position of the machine tool is far more complicated than the direct capture positioning measurement in the modeling and simulation software, the accurate measurement of the axis error is also a major problem in the current machine tool error measurement. The autocollimator can only measure the positioning error of the turntable. The laser interferometer and the ballbar and micrometer of Renishaw Company of the United Kingdom can be used to measure the various geometric errors of the turntable. However, it involves the multi-axis linkage of the machine tool, which has the disadvantages of many instruments required for measurement, complex operation process, time-consuming and inefficient, and high cost. If the machine tool probe is used for measurement, the probe needs to be specially customized, and the installation and calibration time cycle is long. It is also necessary to write a multi-axis linkage CNC program. Therefore, it is necessary to develop a set of universally applicable, accurate, reliable and economically feasible measurement methods for the measurement of the axis position of the machine tool axis. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a method for measuring the center position of the turntable and the dressing wheel of a worm wheel gear grinding machine, which can realize the precise positioning of the Y-axial position of the turntable center and measure the Y-axial offset of the dressing wheel center relative to the turntable center, so as to solve the measurement needs of the center position of the turntable and the dressing wheel of the machine tool for grinding wheel dressing and gear grinding.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A method for measuring the center position of a turntable and a dressing wheel of a worm wheel gear grinding machine comprises the following steps:

[0009] Step 1: Align the grinding wheel spindle and grinding wheel equivalent tooling position

[0010] 11) Align the B1 axis: rotate the A1 axis to make the B1 axis parallel to the Y1 axis;

[0011] 12) Install the grinding wheel equivalent tooling: The grinding wheel equivalent tooling includes a grinding wheel equivalent adapter and a pin shaft, and the pin shaft is located in the radial direction of the grinding wheel equivalent adapter; install the grinding wheel equivalent adapter on the grinding wheel spindle;

[0012] 13) Align the grinding wheel equivalent disc: Align the grinding wheel equivalent disc in the Z1 direction and / or Y1 direction so that the axis of the grinding wheel equivalent disc is perpendicular to the Z1 axis;

[0013] 14) Align the pin: Align the outer circle of the pin in the Z1 direction and the Y1 direction in turn to make the pin axis parallel to the X1 axis;

[0014] Step 2: Determine the center position of the turntable:

[0015] 21) Install a micrometer on the turntable, adjust the positions of the X1 and Y1 axes of the machine tool, so that the micrometer probe is in vertical contact with any point on the outer surface of the pin shaft; drive the Z1 axis of the machine tool to reciprocate, so that the pin shaft reciprocates in the area above and below the micrometer probe, and record the position and reading of the maximum swing of the micrometer dial during this process as the calibration position and calibration reading;

[0016] 22) Adjust the Z1 axis position of the machine tool so that the pin and the micrometer are staggered to avoid interference;

[0017] 23) After driving C1 to rotate 180°, drive the machine tool Z1 axis to reciprocate, so that the pin moves back and forth in the area above and below the micrometer probe;

[0018] 24) Determine whether the current maximum swing position and reading of the dial of the micrometer are consistent with the calibrated position and calibrated reading: If so, the current Y1 axis position is the Y position of the turntable center; if not, drive the Y1 axis to move the distance The moving direction of the Y1 axis is the opposite direction of the extension and retraction direction of the dial gauge probe relative to the calibration position when the dial gauge probe is at the current maximum swing position; wherein y0 represents the calibration reading, and y1 represents the reading corresponding to the current maximum swing position of the dial gauge probe;

[0019] 25) Take the position and reading of the maximum swing of the dial indicator head after the Y1 axis moves as the calibration position and calibration reading, and execute step 22);

[0020] Step 3: Determine the center position of the dressing wheel

[0021] 31) Adjust the C2 axis of the machine tool to the 0° position to align the dressing wheel, and set the dial indicator on the turntable; the number of cycles t = 0;

[0022] 32) Adjust the Z2 position of the machine tool so that the dial gauge probe contacts the working surface of the dressing wheel at an appropriate position, and record the reading Δy on the dial of the dial gauge. t1 and Z2 axis coordinate value z t ;

[0023] 33) Adjust the Z2 position of the machine tool so that the dressing wheel tool holder and the micrometer are staggered to avoid interference;

[0024] 34) Drive C1 axis to rotate 180°;

[0025] 35) Adjust the machine tool Z2 axis to Z t Coordinate position, make the dial gauge probe contact with the dressing wheel, and record the reading Δy of the dial of the dial gauge t2 , get the offset Δd between C1 axis and C2 axis in the Y direction t for:

[0026]

[0027] t = t + 1;

[0028] 36) Determine whether the number of loops t is equal to the maximum number of loops T max :

[0029] If so, the loop ends with T max The average value of the deviation obtained in each cycle As the offset between the C1 axis and the C2 axis in the Y direction; and if This indicates that the center of the turntable is located on the side of the dressing wheel facing the current micrometer probe. This indicates that the center of the turntable is located on the side of the dressing wheel facing away from the current micrometer probe; if This indicates that the Y-direction coordinates of the C1 axis and the C2 axis are the same;

[0030] If not, drive the C1 axis to rotate 180° and then execute step 32).

[0031] Further, in step 11), the method for aligning the B1 axis is:

[0032] 111) Adjust A1 to 0° position, adsorb the magnetic base of the dial gauge on the A-axis turntable, and make the dial gauge probe vertically contact any point on the outer surface of the B-axis;

[0033] 112) Move the Y1 axis back and forth and observe the swing angle range of the dial indicator pointer;

[0034] 113) Determine whether the maximum swing angle of the micrometer pointer is less than the set first threshold: if so, the B1 axis is parallel to the Y1 axis, and the phase angle of the A1 axis at this time is recorded; if not, adjust the angle of the A1 axis and execute step 112).

[0035] Further, in step 13), the method for aligning the grinding wheel equivalent plate in the Z1 direction is:

[0036] 131a) Adsorb the magnetic base of the micrometer on the A1 axis turntable so that the micrometer probe contacts the inner end face or outer end face of the grinding wheel equivalent plate;

[0037] 132a) driving the Z1 axis of the machine tool to move and driving the grinding wheel equivalent plate to move synchronously, so that the micrometer probe maintains vertical contact with the inner end face or outer end face of the grinding wheel equivalent plate, and observing the swing angle range of the micrometer pointer;

[0038] 133a) Determine whether the maximum swing angle of the micrometer pointer is less than the set second threshold value: if so, it indicates that the end face of the grinding wheel equivalent disc is parallel to the Z1 direction, that is, the grinding wheel equivalent disc is aligned in the Z1 direction; if not, adjust the installation position of the grinding wheel equivalent disc in the Y direction and execute step 132a).

[0039] Further, in step 13), the method for aligning the grinding wheel equivalent plate in the Y1 direction is:

[0040] 131b) Adsorb the magnetic base of the micrometer on the A1 axis turntable so that the micrometer probe is in vertical contact with the outer surface of the grinding wheel equivalent plate;

[0041] 132b) driving the Y1 axis of the machine tool to move and driving the grinding wheel equivalent plate to move synchronously, so that the micrometer probe keeps in contact with the outer surface of the grinding wheel equivalent plate, and observing the swing angle range of the micrometer pointer;

[0042] 133b) Determine whether the maximum swing angle of the micrometer pointer is less than the set third threshold value: if so, it indicates that the axis of the grinding wheel equivalent disc is parallel to the Y1 direction, that is, the grinding wheel equivalent disc is aligned in the Y1 direction; if not, adjust the installation position of the grinding wheel equivalent disc in the Z direction and execute step 132b).

[0043] Further, in step 14), the method for aligning the outer circle of the pin in the Z1 direction is:

[0044] 141) Attach the magnetic base of the micrometer to the turntable, rotate the B1 axis to make the pin axis close to horizontal; adjust the height of the Z1 axis of the machine tool to make the micrometer probe vertically contact with the highest point or close to the highest point of the outer circle of the pin in the Z direction;

[0045] 142) Drive the X1 axis of the machine tool to move and drive the pin to move synchronously, so that the dial gauge probe keeps in contact with the surface of the pin, and observe the swing angle range of the dial gauge pointer;

[0046] 143) Determine whether the maximum swing angle of the micrometer pointer is less than the set fourth threshold value: if so, it indicates that the axis of the pin is parallel to the X1Y1 plane, that is, the pin is aligned in the Z1 direction; if not, adjust the rotation angle of the B1 axis and execute step 142).

[0047] Further, in step 14), the method for aligning the outer circle of the pin in the Y1 direction is:

[0048] 144) Adjust the height of the Z1 axis of the machine tool so that the micrometer probe is in vertical contact with the nearest point or close to the nearest point on the outer circle of the pin in the Y1 direction;

[0049] 145) Drive the X1 axis of the machine tool to move and drive the pin to move synchronously, so that the dial gauge probe keeps in contact with the surface of the pin, and observe the swing angle range of the dial gauge pointer;

[0050] 146) Determine whether the maximum swing angle of the micrometer pointer is less than the set fifth threshold value: if so, it indicates that the axis of the pin is parallel to the X1 direction, that is, the pin is aligned in the Y1 direction; if not, adjust the position of the pin in the Y1 direction and execute step 144).

[0051] Furthermore, in step 21) and step 25), the dial is rotated so that the reading corresponding to the maximum swing position of the dial pointer is "0", and the pointer swing position and reading after the dial is rotated are calibrated as the calibration position and calibration reading.

[0052] The beneficial effects of the present invention are:

[0053] The method for measuring the center position of a worm grinding wheel gear grinding machine turntable and a dressing wheel comprises the following steps: firstly, designing a grinding wheel equivalent tooling based on the structural parameters of the worm grinding wheel to solve the interference problem of the grinding wheel surface roughness and tooth shape on the micrometer measurement; then, adjusting the phase angle of the tool holder A1 axis and aligning the B1 axis through the micrometer, installing the tooling and aligning the end face and the outer circle of the tooling in succession based on the "single table method", and then aligning the pin axis in the Z1 axis and Y1 axis directions in turn; then, driving the micrometer to deflect through the machine tool turntable, and moving the Y1 axis so that the pin axis coincides with the Y coordinate of the center of the turntable, and determining the center position of the turntable; finally, slowly raising and lowering the Z2 axis, comparing the micrometer pointer indication deviation before and after the workpiece turntable rotates 180 degrees, thereby determining the Y offset of the axis center of the C1 axis and the C2 axis, and then obtaining the center position of the dressing wheel. In summary, the present invention is applicable to the problem of accurate measurement of the center position of the turntable and the dressing wheel in the face gear worm grinding wheel gear grinding processing, and the measurement method also has certain guiding significance for the assembly and production of gear making machine tools; the measurement tool only needs to use conventional tools such as micrometers and customized tooling, and does not involve complicated mathematical derivation and calculation processes, and basically does not require the writing of CNC programs. Operators can carry out actual measurement work after being proficient in the use of the micrometer. Therefore, the measurement method involved in the present invention has the advantages of good versatility, high precision, low measurement cost and easy implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0055] Figure 1 The structure diagram of the worm wheel gear grinding machine;

[0056] Figure 2 It is a schematic diagram of the machine tool transmission chain;

[0057] Figure 3 Schematic diagram of the structure of the grinding wheel equivalent tooling; (a) front view; (b) cross-sectional view; (c) axonometric view;

[0058] Figure 4 Schematic diagram of the second structure of the grinding wheel equivalent tooling; (a) front view; (b) cross-sectional view; (c) axonometric view;

[0059] Figure 5 This is the structural principle diagram when the pin is installed misaligned;

[0060] Figure 6 Schematic diagram of the grinding wheel equivalent plate alignment; (a) Y1 axis alignment; (b) Z1 axis alignment;

[0061] Figure 7 Schematic diagram of the pin position alignment; (a) Diagram of the installation of the micrometer when the pin outer circle is aligned in the Z1 direction and the Y1 direction; (b) Alignment in the Z1 direction; (c) After alignment; (d) Alignment in the Y1 direction;

[0062] Figure 8 The Y-axis position measurement principle diagram of the turntable (C1 axis) center; (a) and (c) are the position relationship diagrams between the micrometer and the pin before and after the turntable rotates 180° before the turntable center position is determined; (b) and (d) are the position relationship diagrams between the micrometer and the pin before and after the turntable rotates 180° after the turntable center position is determined;

[0063] Fig. 9 (a) and (c) are the position relationship diagrams between the micrometer and the dressing wheel before and after the turntable rotates 180°; (b) and (d) are the position relationship diagrams between the micrometer and the dressing wheel after the turntable rotates 180°. DETAILED DESCRIPTION

[0064] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0065] The structure of the worm wheel gear grinding machine and the positive direction distribution of each motion axis are as follows Figure 1 As shown, the corresponding machine tool transmission chain is as follows Figure 2 As shown. During the gear grinding process, the grinding wheel and the workpiece are fixed on the electric spindle and the turntable respectively by the fixture, and there is no relative motion between them, so there is no relative motion error. Therefore, the movement of the grinding wheel and the workpiece can be regarded as driven by the motion axis of the machine tool, and the transmission chain sequence from the grinding wheel to the workpiece can be simplified as: grinding wheel → Y1 axis → A1 axis → Z1 axis → X1 axis → bed → C1 axis → workpiece. Similarly, the transmission chain sequence of the grinding wheel dressing is: dressing wheel → C2 axis → Z2 axis → bed → X1 axis → Z1 axis → A1 axis → Y1 axis → grinding wheel.

[0066] Specifically, the method for measuring the center position of the turntable and the dressing wheel of the worm wheel gear grinding machine of this embodiment includes the following steps:

[0067] Step 1: Align the grinding wheel spindle and grinding wheel equivalent tooling position

[0068] 11) Align the B1 axis: rotate the A1 axis so that the B1 axis is parallel to the Y1 axis. Before installing the grinding wheel equivalent tooling, align the B1 axis first. Its axis should be parallel to the Y1 axis and perpendicular to the C1 axis. Taking into account the structural characteristics of the machine tool, adjust the A1 axis phase angle to 0° to align the B1 axis. Because the Y-axis position of the A1 axis center is fixed, it can only move with the X1 and Z1 axes, and the Y1 axis can only drive the B1 axis to perform reciprocating linear motion along the guide rail on the A1 axis component, and the two move synchronously in the Y direction. Specifically, the method for aligning the B1 axis in this embodiment is:

[0069] 111) Adjust A1 to 0° position, adsorb the magnetic base of the dial gauge on the A-axis turntable, and make the dial gauge probe vertically contact any point on the outer surface of the B-axis;

[0070] 112) Move the Y1 axis back and forth and observe the swing angle range of the dial indicator pointer;

[0071] 113) Determine whether the maximum swing angle of the micrometer pointer is less than the set first threshold: if so, the B1 axis is parallel to the Y1 axis, and the phase angle α of the A1 axis at this time is recorded; if not, adjust the angle of the A1 axis and execute step 112).

[0072] 12) Install the grinding wheel equivalent tooling: The grinding wheel equivalent tooling includes a grinding wheel equivalent adapter and a pin shaft, and the pin shaft is located in the radial direction of the grinding wheel equivalent adapter; install the grinding wheel equivalent adapter on the grinding wheel spindle. The assembly structure of the grinding wheel equivalent tooling is as follows: Figure 3 As shown in the figure, the grinding wheel equivalent plate and the pin shaft adopt a slight interference fit. If the grinding wheel tool shaft allows customization, a through hole slightly larger than the pin shaft is set at the tooling installation position through its axis to meet the Figure 4 The installation conditions shown in the figure can further improve the positioning accuracy of the pin, thereby effectively avoiding Figure 5 The pin shaft is misaligned. To avoid damaging the micrometer probe, the outer dimensions of the grinding wheel equivalent adapter must be consistent with the inner diameter and thickness of the standard grinding wheel tool (such as outer diameter × thickness × inner diameter: 280 × 30 × 100, unit: mm), and the surface must be polished. The pin shaft is a standard cylindrical pin with a surface roughness of Ra ≤ 0.8 μm, made of 35 or 45 steel, and hardened. It is easier to operate if you choose a sample with larger size parameters.

[0073] 13) Align the grinding wheel equivalent disc: Align the grinding wheel equivalent disc in the Z1 direction and / or Y1 direction so that the axis of the grinding wheel equivalent disc is perpendicular to the Z1 axis.

[0074] After installing the grinding wheel equivalent tooling, align the outer end face (or inner end face) and outer circle of the grinding wheel equivalent adapter, then install the pin and align its outer circle in the Z1 axis and Y1 axis directions. For the grinding wheel equivalent adapter, usually the outer circle alignment is satisfied after the outer end face is aligned. From the perspective of rigor, this embodiment also aligns the outer circle of the grinding wheel equivalent adapter in the Y1 axis direction for further verification. The measurement principles are as follows: Figure 6 , Figure 7 As shown, this process always keeps the tool holder rotation axis A1 = α.

[0075] Specifically, the method for aligning the grinding wheel equivalent adapter in the Z1 direction is:

[0076] 131a) Place the magnetic base of the micrometer on the A1 axis turntable, so that the micrometer probe contacts the inner or outer end surface of the grinding wheel equivalent plate, such as Figure 6 As shown in (b);

[0077] 132a) driving the Z1 axis of the machine tool to move and driving the grinding wheel equivalent plate to move synchronously, so that the micrometer probe maintains vertical contact with the inner end face or outer end face of the grinding wheel equivalent plate, and observing the swing angle range of the micrometer pointer;

[0078] 133a) Determine whether the maximum swing angle of the micrometer pointer is less than the set second threshold value: if so, it indicates that the end face of the grinding wheel equivalent disc is parallel to the Z1 direction, that is, the grinding wheel equivalent disc is aligned in the Z1 direction; if not, adjust the installation position of the grinding wheel equivalent disc in the Y direction and execute step 132a).

[0079] The method for aligning the grinding wheel equivalent adapter in the Y1 direction is:

[0080] 131b) Place the magnetic base of the micrometer on the A1 axis turntable so that the micrometer probe is in vertical contact with the outer surface of the grinding wheel equivalent plate. Figure 6 As shown in (a);

[0081] 132b) driving the Y1 axis of the machine tool to move and driving the grinding wheel equivalent plate to move synchronously, so that the micrometer probe keeps in contact with the outer surface of the grinding wheel equivalent plate, and observing the swing angle range of the micrometer pointer;

[0082] 133b) Determine whether the maximum swing angle of the micrometer pointer is less than the set third threshold value: if so, it indicates that the axis of the grinding wheel equivalent disc is parallel to the Y1 direction, that is, the grinding wheel equivalent disc is aligned in the Y1 direction; if not, adjust the installation position of the grinding wheel equivalent disc in the Z direction and execute step 132b).

[0083] 14) Align the pin: Align the outer circle of the pin in Z1 direction and Y1 direction in turn to make the pin axis parallel to the X1 axis.

[0084] Specifically, in this embodiment, the method for aligning the outer circle of the pin in the Z1 direction is:

[0085] 141) Place the magnetic base of the micrometer on the turntable, rotate the B1 axis to make the pin axis close to horizontal; adjust the height of the Z1 axis of the machine tool so that the micrometer probe is in vertical contact with the highest point or near the highest point of the pin outer circle in the Z direction, such as Figure 7 As shown in (a) and (b);

[0086] 142) Drive the X1 axis of the machine tool to move and drive the pin to move synchronously, so that the dial gauge probe keeps in contact with the surface of the pin, and observe the swing angle range of the dial gauge pointer;

[0087] 143) Determine whether the maximum swing angle of the micrometer pointer is less than the set fourth threshold value: if so, it indicates that the axis of the pin is parallel to the X1Y1 plane, that is, the pin is aligned in the Z1 direction; if not, adjust the rotation angle of the B1 axis and execute step 142).

[0088] Further, in step 14), the method for aligning the outer circle of the pin in the Y1 direction is:

[0089] 144) Adjust the height of the Z1 axis of the machine tool so that the micrometer probe is in vertical contact with the nearest point or close to the nearest point on the outer circle of the pin in the Y1 direction, such as Figure 7 As shown in (a) and (d);

[0090] 145) Drive the X1 axis of the machine tool to move and drive the pin to move synchronously, so that the dial gauge probe keeps in contact with the surface of the pin, and observe the swing angle range of the dial gauge pointer;

[0091] 146) Determine whether the maximum swing angle of the micrometer pointer is less than the set fifth threshold value: if so, it indicates that the axis of the pin is parallel to the X1 direction, that is, the pin is aligned in the Y1 direction; if not, adjust the position of the pin in the Y1 direction and execute step 144).

[0092] Step 2: Determine the center position of the turntable:

[0093] 21) Install a micrometer on the turntable, adjust the positions of the X1 axis and Y1 axis of the machine tool, so that the micrometer probe is in vertical contact with any point on the outer surface of the pin shaft; drive the Z1 axis of the machine tool to move back and forth, so that the pin shaft moves back and forth in the upper and lower areas of the micrometer probe, and record the position and reading of the maximum swing of the micrometer dial during this process as the calibration position and calibration reading; specifically, in this embodiment, rotate the dial so that the reading corresponding to the maximum swing position of the dial pointer is "0", and calibrate the pointer swing position and reading after rotating the dial as the calibration position and calibration reading, that is, the reading of y0 is "0";

[0094] 22) Adjust the Z1 axis position of the machine tool so that the pin and the micrometer are staggered to avoid interference;

[0095] 23) After driving C1 to rotate 180°, drive the machine tool Z1 axis to reciprocate, so that the pin moves back and forth in the area above and below the micrometer probe;

[0096] 24) Determine whether the current maximum swing position and reading of the dial of the micrometer are consistent with the calibrated position and calibrated reading: If so, the current Y1 axis position is the Y position of the turntable center; if not, drive the Y1 axis to move the distance The moving direction of the Y1 axis is the opposite direction of the telescopic direction of the micrometer probe relative to the calibration position when it is at the current maximum swing position. Figure 8 (c) If the two are consistent, the indicator pointer turns counterclockwise, indicating a loose gauge, i.e., the probe pops out; the opposite is true if the indicator pointer turns clockwise, indicating a pressure gauge, i.e., the probe shrinks. Among them, y0 represents the calibration reading, and y1 represents the reading corresponding to the current maximum swing position of the probe of the dial gauge;

[0097] 25) Take the position and reading of the maximum swing of the micrometer head after the Y1-axis moves as the calibration position and calibration reading, and execute step 22); specifically, in this embodiment, rotate the dial so that the reading corresponding to the maximum swing position of the dial pointer is "0", even if the reading of y0 is "0".

[0098] Step 3: Determine the center position of the dressing wheel

[0099] Since the end faces of the dressing wheel on both sides are involute tooth profiles, their centers pass through the C2 axis deflection axis, and there is a deviation between the micrometer and millimeter level with the center of the machine tool turntable in the Y-axis direction. In this embodiment, a micrometer with an accuracy of 0.001mm and a range of 5mm is selected to meet the measurement requirements of the two axis center offsets. Combined with the center position of the turntable in step 2, the center position of the dressing wheel can be obtained. Usually, the probe rod of the micrometer is an elastic and retractable structure. Specifically, in this embodiment, the method for determining the center position of the dressing wheel is:

[0100] 31) Adjust the C2 axis of the machine tool to the 0° position to align the dressing wheel, and set the dial indicator on the turntable; the number of cycles t = 0;

[0101] 32) Adjust the Z2 position of the machine tool so that the dial gauge probe contacts the working surface of the dressing wheel at an appropriate position, and record the reading Δy on the dial of the dial gauge. t1 and Z2 axis coordinate value z t ;

[0102] 33) Adjust the Z2 position of the machine tool so that the dressing wheel tool holder and the micrometer are staggered to avoid interference;

[0103] 34) Drive C1 axis to rotate 180°;

[0104] 35) Adjust the machine tool Z2 axis to Z t Coordinate position, make the dial gauge probe contact with the dressing wheel, and record the reading Δy of the dial of the dial gauge t2 , get the offset Δd between C1 axis and C2 axis in the Y direction t for:

[0105]

[0106] t = t + 1;

[0107] 36) Determine whether the number of loops t is equal to the maximum number of loops T max , where T max is a positive integer greater than or equal to 1:

[0108] If so, the loop ends with T max The average value of the deviation obtained in each cycle As the offset between the C1 axis and the C2 axis in the Y direction; and if This indicates that the center of the turntable is located on the side of the dressing wheel facing the current micrometer probe. 0, it indicates that the center of the turntable is located on the side of the dressing wheel facing away from the current micrometer probe; if This indicates that the Y-axis coordinates of the C1 axis and the C2 axis are the same. If the axis positions of the two axes are distributed as follows Fig. 9 (a) and (d) show, the offset value is negative. That is, the Y coordinate of the axis of C1 is smaller than that of C2; otherwise, the offset value is positive. The corresponding y-coordinate of the axis of C1 is greater than that of C2.

[0109] If not, drive the C1 axis to rotate 180° and then execute step 32).

[0110] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A method for measuring the center position of a turntable and a dressing wheel of a worm wheel gear grinding machine, characterized in that: The steps include: Step 1: Align the grinding wheel spindle and grinding wheel equivalent tooling position 11) Align the B1 axis: rotate the A1 axis to make the B1 axis parallel to the Y1 axis; 12) Install the grinding wheel equivalent tooling: The grinding wheel equivalent tooling includes a grinding wheel equivalent adapter and a pin shaft, and the pin shaft is located in the radial direction of the grinding wheel equivalent adapter; install the grinding wheel equivalent adapter on the grinding wheel spindle; 13) Align the grinding wheel equivalent disc: Align the grinding wheel equivalent disc in the Z1 direction and / or Y1 direction so that the axis of the grinding wheel equivalent disc is perpendicular to the Z1 axis; 14) Align the pin: Align the outer circle of the pin in the Z1 direction and the Y1 direction in turn to make the pin axis parallel to the X1 axis; Step 2: Determine the center position of the turntable: 21) Install a micrometer on the turntable, adjust the positions of the X1 and Y1 axes of the machine tool, so that the micrometer probe is in vertical contact with any point on the outer surface of the pin shaft; drive the Z1 axis of the machine tool to reciprocate, so that the pin shaft reciprocates in the area above and below the micrometer probe, and record the position and reading of the maximum swing of the micrometer dial during this process as the calibration position and calibration reading; 22) Adjust the Z1 axis position of the machine tool so that the pin and the micrometer are staggered to avoid interference; 23) After driving the C1 axis to rotate 180°, drive the machine tool Z1 axis to reciprocate, so that the pin moves back and forth in the area above and below the micrometer probe; 24) Determine whether the current maximum swing position and reading of the dial of the micrometer are consistent with the calibrated position and calibrated reading: If so, the current Y1 axis position is the Y position of the turntable center; if not, drive the Y1 axis to move the distance The moving direction of the Y1 axis is the opposite direction of the extension and retraction direction of the dial gauge probe relative to the calibration position when the dial gauge probe is at the current maximum swing position; wherein y0 represents the calibration reading, and y1 represents the reading corresponding to the current maximum swing position of the dial gauge probe; 25) Take the position and reading of the maximum swing of the dial indicator head after the Y1 axis moves as the calibration position and calibration reading, and execute step 22); Step 3: Determine the center position of the dressing wheel 31) Adjust the C2 axis of the machine tool to the 0° position to align the dressing wheel, and set the dial indicator on the turntable; the number of cycles t = 0; 32) Adjust the Z2 position of the machine tool so that the dial gauge probe contacts the working surface of the dressing wheel at an appropriate position, and record the reading Δy on the dial of the dial gauge. t1 and Z2 axis coordinate value z t ; 33) Adjust the Z2 position of the machine tool so that the dressing wheel tool holder and the micrometer are staggered to avoid interference; 34) Drive C1 axis to rotate 180°; 35) Adjust the machine tool Z2 axis to Z t Coordinate position, make the dial gauge probe contact with the dressing wheel, and record the reading Δy of the dial of the dial gauge t2 , get the offset Δd between C1 axis and C2 axis in the Y direction t for: t = t + 1; 36) Determine whether the number of loops t is equal to the maximum number of loops T max : If so, the loop ends with T max The average value of the deviation obtained in each cycle As the offset between the C1 axis and the C2 axis in the Y direction; and if This indicates that the center of the turntable is located on the side of the dressing wheel facing the current micrometer probe. This indicates that the center of the turntable is located on the side of the dressing wheel facing away from the current micrometer probe; if This indicates that the Y-direction coordinates of the C1 axis and the C2 axis are the same; If not, drive the C1 axis to rotate 180° and then execute step 32).

2. The method for measuring the center position of the worm wheel gear grinding machine turntable and the dressing wheel according to claim 1, characterized in that: In step 11), the method for aligning the B1 axis is: 111) Adjust A1 to 0° position, adsorb the magnetic base of the dial gauge on the A-axis turntable, and make the dial gauge probe vertically contact any point on the outer surface of the B-axis; 112) Move the Y1 axis back and forth and observe the swing angle range of the dial indicator pointer; 113) Determine whether the maximum swing angle of the micrometer pointer is less than the set first threshold: if so, the B1 axis is parallel to the Y1 axis, and the phase angle of the A1 axis at this time is recorded; if not, adjust the angle of the A1 axis and execute step 112).

3. The method for measuring the center position of the worm wheel gear grinding machine turntable and the dressing wheel according to claim 1, characterized in that: In the step 13), the method for aligning the grinding wheel equivalent plate in the Z1 direction is: 131a) Adsorb the magnetic base of the micrometer on the A1 axis turntable so that the micrometer probe contacts the inner end face or outer end face of the grinding wheel equivalent plate; 132a) driving the Z1 axis of the machine tool to move and driving the grinding wheel equivalent plate to move synchronously, so that the micrometer probe maintains vertical contact with the inner end face or outer end face of the grinding wheel equivalent plate, and observing the swing angle range of the micrometer pointer; 133a) Determine whether the maximum swing angle of the micrometer pointer is less than the set second threshold value: if so, it indicates that the end face of the grinding wheel equivalent disc is parallel to the Z1 direction, that is, the grinding wheel equivalent disc is aligned in the Z1 direction; if not, adjust the installation position of the grinding wheel equivalent disc in the Y direction and execute step 132a).

4. The method for measuring the center position of the turntable and the dressing wheel of the worm wheel gear grinding machine according to claim 1, characterized in that: In the step 13), the method for aligning the grinding wheel equivalent plate in the Y1 direction is: 131b) Adsorb the magnetic base of the micrometer on the A1 axis turntable so that the micrometer probe is in vertical contact with the outer surface of the grinding wheel equivalent plate; 132b) driving the Y1 axis of the machine tool to move and driving the grinding wheel equivalent plate to move synchronously, so that the micrometer probe keeps in contact with the outer surface of the grinding wheel equivalent plate, and observing the swing angle range of the micrometer pointer; 133b) Determine whether the maximum swing angle of the micrometer pointer is less than the set third threshold value: if so, it indicates that the axis of the grinding wheel equivalent disc is parallel to the Y1 direction, that is, the grinding wheel equivalent disc is aligned in the Y1 direction; if not, adjust the installation position of the grinding wheel equivalent disc in the Z direction and execute step 132b).

5. The method for measuring the center position of the worm wheel gear grinding machine turntable and the dressing wheel according to claim 1, characterized in that: In the step 14), the method for aligning the outer circle of the pin in the Z1 direction is: 141) Attach the magnetic base of the micrometer to the turntable, rotate the B1 axis to make the pin axis horizontal; adjust the height of the Z1 axis of the machine tool so that the micrometer probe is in vertical contact with the highest point in the Z direction of the pin outer circle; 142) Drive the X1 axis of the machine tool to move and drive the pin to move synchronously, so that the dial gauge probe keeps in contact with the surface of the pin, and observe the swing angle range of the dial gauge pointer; 143) Determine whether the maximum swing angle of the micrometer pointer is less than the set fourth threshold value: if so, it indicates that the axis of the pin is parallel to the X1Y1 plane, that is, the pin is aligned in the Z1 direction; if not, adjust the rotation angle of the B1 axis and execute step 142).

6. The method for measuring the center position of the worm wheel gear grinding machine turntable and the dressing wheel according to claim 5, characterized in that: In the step 14), the method for aligning the outer circle of the pin in the Y1 direction is: 144) Adjust the height of the Z1 axis of the machine tool so that the micrometer probe is in vertical contact with the nearest point on the outer circle of the pin in the Y1 direction; 145) Drive the X1 axis of the machine tool to move and drive the pin to move synchronously, so that the dial gauge probe keeps in contact with the surface of the pin, and observe the swing angle range of the dial gauge pointer; 146) Determine whether the maximum swing angle of the micrometer pointer is less than the set fifth threshold value: if so, it indicates that the axis of the pin is parallel to the X1 direction, that is, the pin is aligned in the Y1 direction; if not, adjust the position of the pin in the Y1 direction and execute step 144).

7. The method for measuring the center position of the turntable and the dressing wheel of a worm wheel gear grinding machine according to claim 1, characterized in that: In step 21) and step 25), the dial is rotated so that the reading corresponding to the maximum swing position of the dial pointer is "0", and the pointer swing position and reading after the dial is rotated are calibrated as the calibration position and calibration reading.

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