High-precision internal tooth grinding method for internal tooth processing of automobile gear

Abstract

The application discloses a high-precision internal tooth grinding method for automobile gear internal tooth processing. The grinding method comprises the following steps: S1, starting a numerical control grinding machine, selecting a processing program and setting gear processing parameters; S2, the current tooth contact of a grinding wheel and a workpiece gear; S3, after the grinding of the current tooth is completed, the grinding wheel is separated from the workpiece gear; S4, the workpiece gear is divided into teeth, wherein the tooth division pulse number is equal to the basic pulse number plus the compensation pulse number; and S5, repeating S2, S3 and S4. When the grinding of the current tooth is completed and the next tooth is switched to, the decimal part of the tooth division pulse of the current tooth is taken as the compensation pulse, the compensation pulse is added to the basic pulse, so that the tooth division pulse of the next tooth is obtained, and the workpiece gear can be driven to rotate to the next tooth with high precision by the tooth division motor. The high-precision tooth division is realized, the transmission efficiency, the carrying capacity and the service life of the workpiece gear are improved, the noise level of the workpiece gear is reduced, and the increasingly strict requirements of the automobile industry on the gear grinding precision are met.

Description

Technical Field

[0001] This application relates to the field of internal gear grinding technology for automotive gears, and in particular to a high-precision internal gear grinding method for machining internal gears in automotive gears. Background Technology

[0002] Gears with internal teeth are widely used in automobiles, such as planetary gears, synchronizer gears, and parking gears. Grinding the internal teeth of automotive gears is a crucial final finishing process in gear manufacturing. The grinding precision directly determines the gear's transmission efficiency, noise level, vibration characteristics, load-bearing capacity, and service life. The automotive industry has extremely stringent requirements for gear precision.

[0003] In the process of grinding the internal teeth of automotive gears, the internal teeth of the gears need to be ground one by one. After grinding one tooth of the gear, the gear needs to be rotated so that the next tooth faces the grinding wheel in order to grind the next tooth.

[0004] In the existing technology, the rotation angle of the gear is controlled by the command pulse of the servo motor of the workpiece axis. Each pulse corresponds to a small fixed angular displacement of the gear. The number of indexing pulses can be obtained by calculating the number of pulses required for the gear to rotate one tooth. However, when the number of indexing pulses is not an integer, indexing error will occur. The indexing error will gradually accumulate during the gear grinding process, affecting the grinding accuracy of the gear.

[0005] Therefore, it is necessary to propose a high-precision internal gear grinding method for automotive gear internal gear machining to improve the grinding accuracy of gears, which has become an important technical problem that urgently needs to be solved. Summary of the Invention

[0006] This application provides a high-precision internal gear grinding method for automotive gear internal gear machining, aiming to solve the problem in the prior art that when the number of indexing pulses is not an integer, indexing error will occur, and the indexing error will gradually accumulate during the gear grinding process, affecting the grinding accuracy of the gear.

[0007] To achieve the above objectives, this application proposes a high-precision internal gear grinding method for automotive gear internal gear machining. This method is implemented on a CNC grinding machine integrated with a touch screen, a grinding wheel dressing station, X-axis, Y-axis, Z-axis, 4-axis, and 5-axis machining centers. The grinding method includes the following steps:

[0008] S1. Start the CNC grinding machine, select the machining program and set the gear machining parameters;

[0009] S2, The grinding wheel contacts the current tooth of the workpiece gear, completing the grinding of the current tooth of the workpiece gear;

[0010] S3. After the grinding of the current tooth is completed, the grinding wheel separates from the workpiece gear;

[0011] S4. Gear tooth splitting on the workpiece, wherein the calculation method for the number of tooth splitting pulses is as follows:

[0012]

[0013]

[0014] In the formula: This represents the number of tooth-dividing pulses during the (n+1)th tooth division. Indicates the basic pulse number. This represents the number of the nth tooth-dividing pulse. This indicates the number of tooth-splitting pulses during the first tooth splitting;

[0015] S5. Repeat S2, S3 and S4 to complete the grinding of the internal teeth of the workpiece gear.

[0016] In some embodiments, the calculation method for the basic pulse number in S4 above is as follows:

[0017]

[0018] In the formula: This indicates the number of pulses required for the output shaft of the geared motor to rotate one revolution. This indicates the transmission ratio between the output shaft of the geared motor and the workpiece gear. This indicates the number of teeth on the gear in the workpiece.

[0019] In some embodiments, the specific method for tooth splitting in S4 above is as follows:

[0020] S41. After completing the grinding of the current tooth, compare the number of teeth ground with the preset number of teeth.

[0021] S42. When the number of ground teeth is less than the preset number of teeth, control the workpiece gear to rotate according to the number of tooth splitting pulses so that the next tooth faces the gear and completes the tooth splitting.

[0022] S43. When the number of ground teeth is greater than or equal to the preset number of teeth, the tooth splitting ends.

[0023] In some embodiments, the starting of the CNC grinding machine in S1 above further includes the following steps:

[0024] S11. Start the CNC grinding machine;

[0025] S12. Determine if there is an alarm message;

[0026] S13. When an alarm is detected, the alarm information is displayed on the touchscreen.

[0027] S14. When there is no alarm information, the Y-axis, Z-axis, X-axis, 5-axis and 4-axis return to zero in sequence.

[0028] In some embodiments, S2 specifically includes the following steps:

[0029] S21, The grinding wheel contacts the current tooth of the workpiece gear and reciprocates grinding the current tooth of the workpiece gear;

[0030] S22, The grinding wheel disengages from the current tooth of the workpiece gear;

[0031] S23. The grinding wheel is moved to the grinding wheel dressing station for dressing.

[0032] S24. After the grinding wheel is dressed, the grinding wheel re-engages with the current tooth of the workpiece gear and grinds the current tooth of the workpiece gear repeatedly.

[0033] In some embodiments, in S24 above, after the grinding wheel is modified, a compensation signal is generated based on the shape change of the gear, and the movement of the grinding wheel is compensated based on the compensation signal to ensure that the grinding wheel and the current tooth of the workpiece gear re-establish effective contact.

[0034] In some embodiments, an automatic cyclic gear grinding method is also included, which includes the following steps:

[0035] A1. Compare the number of teeth that have been ground to the preset number of teeth;

[0036] A2. Grinding is complete when the number of teeth that have been ground is greater than or equal to the preset number of teeth.

[0037] A3. When the number of teeth that have been ground is less than the preset number of teeth, the grinding wheel contacts the current tooth of the workpiece gear to complete the grinding of the current tooth of the workpiece gear.

[0038] A4. After the grinding of the current tooth is completed, the grinding wheel separates from the workpiece gear;

[0039] A5. Increment the number of teeth that have been ground by one, and recompare the number of teeth that have been ground with the preset number of teeth.

[0040] A6. Grinding is complete when the number of teeth that have been ground is greater than or equal to the preset number of teeth.

[0041] A7. When the number of teeth that have been ground is less than the preset number of teeth, the workpiece gear will split teeth;

[0042] A8. Repeat steps A3-A7.

[0043] In some embodiments, the touch screen is equipped with an electronic handwheel, which, along with the PLC, controls the movement of the X-axis, Y-axis, Z-axis, 4-axis, and 5-axis.

[0044] This application proposes a high-precision internal gear grinding method for automotive gear internal gear machining. This method is implemented on a CNC grinding machine integrated with a touchscreen, a grinding wheel dressing station, and X, Y, Z axes, 4 axes, and 5 axes. The grinding method includes the following steps: S1, starting the CNC grinding machine, selecting the machining program, and setting the gear machining parameters; S2, the grinding wheel contacts the current tooth of the workpiece gear to complete the grinding of the current tooth; S3, after grinding the current tooth, the grinding wheel separates from the workpiece gear; S4, the workpiece gear is split into teeth, wherein the calculation method for the number of tooth splitting pulses is as follows:

[0045]

[0046]

[0047] In the formula: This represents the number of tooth-dividing pulses during the (n+1)th tooth division. Indicates the basic pulse number. This represents the number of the nth tooth-dividing pulse. This indicates the number of indexing pulses during the first tooth splitting; S5, repeating S2, S3, and S4, completes the grinding of the internal teeth of the workpiece gear. The internal teeth of the workpiece gear are ground one by one by the grinding wheel of the CNC grinding machine to complete the grinding process of the internal teeth of the workpiece gear. When the current tooth is finished and the machine switches to the next tooth, the decimal part of the current tooth indexing pulse is used as a compensation pulse. The compensation pulse is added to the basic pulse to obtain the indexing pulse for the next tooth, enabling the indexing motor to drive the workpiece gear to rotate to the next tooth with high precision. This application improves the grinding accuracy of the workpiece gear through the above steps, thereby improving the transmission efficiency, load-bearing capacity, and service life of the workpiece gear, and reducing the noise level of the workpiece gear, meeting the increasingly stringent requirements of the automotive industry for gear grinding accuracy. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0049] Figure 1 This is a technical roadmap of a high-precision internal gear grinding method for machining internal gears in automobiles, as described in one embodiment of this application.

[0050] Figure 2 This is a flowchart of the tooth splitting process in one embodiment of this application;

[0051] Figure 3 This is a flowchart illustrating the zero-return process in one embodiment of this application;

[0052] Figure 4 This is a flowchart of an automatic cyclic gear grinding method in one embodiment of this application. Detailed Implementation

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0054] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0055] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0056] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0057] See Figure 1As shown, this application proposes a high-precision internal gear grinding method for automotive gear internal gear machining. This machining method is implemented on a CNC grinding machine integrating a touch screen, a grinding wheel dressing station, and X, Y, Z axes, 4 axes, and 5 axes. The X-axis is a radial axis, controlling the radial movement of the grinding wheel along the workpiece gear and controlling the center distance between the grinding wheel and the workpiece. The Y-axis is the feed axis, controlling the linear movement of the grinding wheel along the cutting direction and mainly used to control the grinding depth. The Z-axis is an axial axis, controlling the movement of the grinding wheel along the workpiece axis to drive the grinding wheel to scan the full tooth width range of the internal gear. The 4th axis is the workpiece axis, a rotary axis used to drive the workpiece rotation to complete the tooth indexing action. The 5th axis is an angle axis, a rotary axis that drives the grinding wheel head to tilt and oscillate. The grinding wheel dressing station is used to repair the shape of the grinding wheel. The dressing station can achieve the desired shape using a dressing tool or dressing groove. For details, please refer to CN213917763U - A Grinding Wheel Dresser and CN209503850U - Grinding Wheel Dressing Components. The specific structure of the grinding wheel dressing station is not limited here. The grinding process includes the following steps:

[0058] S1. Start the CNC grinding machine, select the machining program and set the gear machining parameters; after starting the CNC grinding machine, select the internal gear machining program for the workpiece gear and input the gear machining parameters, including but not limited to the number of teeth, root cone angle, correction value, grinding wheel speed, etc.

[0059] S2, The grinding wheel contacts the current tooth of the workpiece gear, completing the grinding of the current tooth of the workpiece gear;

[0060] S3. After grinding the current tooth, the grinding wheel separates from the workpiece gear. The grinding wheel rotates under the drive of the motor, and the cooling system is activated to cool the workpiece gear during the grinding process. The Y-axis controls the feed of the workpiece gear, and the Z-axis is linked to reciprocate grinding of the current tooth of the workpiece gear, achieving rough grinding of the current tooth. After rough grinding, the grinding wheel is dressed at the grinding wheel dressing station. After dressing, the Y-axis controls the feed of the workpiece gear, and the Z-axis is linked to reciprocate grinding of the current tooth of the workpiece gear, achieving fine grinding of the current tooth. After fine grinding, the grinding of the current tooth of the workpiece gear is completed.

[0061] S4. Gear tooth splitting on the workpiece, wherein the calculation method for the number of tooth splitting pulses is as follows:

[0062]

[0063]

[0064] In the formula: This represents the number of tooth-dividing pulses during the (n+1)th tooth division. Indicates the basic pulse number. This represents the number of the nth tooth-dividing pulse. This indicates the number of tooth-splitting pulses during the first tooth splitting. This function represents the rounding function. After grinding the current tooth of a workpiece gear, it is necessary to grind the next tooth. At this time, the indexing motor drives the workpiece gear to rotate so that the next tooth faces the grinding wheel. The base pulse count is the number of pulses required for the workpiece gear to rotate one tooth. When the base pulse count is not an integer, and the indexing motor can only rotate an integer multiple of the pulse count, the decimal part of the base pulse count is continuously discarded. After grinding multiple teeth, the discarded pulse count gradually accumulates into a relatively large indexing error value, resulting in a significant reduction in the grinding accuracy of the workpiece gear. This affects the transmission efficiency, noise level, vibration characteristics, load-bearing capacity, and service life of the workpiece gear. Therefore, during gear grinding, the decimal part of the current tooth indexing pulse is used as a compensation pulse. The compensation pulse is added to the base pulse to obtain the indexing pulse for the next tooth. This can effectively improve the indexing accuracy of the workpiece gear, thereby improving the grinding accuracy of the workpiece gear, increasing the transmission efficiency, load-bearing capacity, and service life of the workpiece gear, and reducing the noise level of the workpiece gear, meeting the increasingly stringent requirements of the automotive industry for gear grinding accuracy.

[0065] S5. Repeat S2, S3 and S4 to complete the grinding of the internal teeth of the workpiece gear.

[0066] Specifically, the internal teeth of the workpiece gear are ground one by one by the grinding wheel of a CNC grinding machine to complete the grinding process of the internal teeth of the workpiece gear. When the current tooth is ground and the machine switches to the next tooth, the decimal part of the current tooth indexing pulse is used as a compensation pulse. The compensation pulse is added to the base pulse to obtain the indexing pulse for the next tooth, enabling the indexing motor to drive the workpiece gear to rotate to the next tooth with high precision. This application improves the grinding accuracy of the workpiece gear through the above steps, thereby improving the transmission efficiency, load-bearing capacity and service life of the workpiece gear, and reducing the noise level of the workpiece gear, meeting the increasingly stringent requirements of the automotive industry for gear grinding accuracy.

[0067] In some embodiments, the calculation method for the basic pulse number in S4 above is as follows:

[0068]

[0069] In the formula: This indicates the number of pulses required for the output shaft of the geared motor to rotate one revolution. This indicates the transmission ratio between the output shaft of the geared motor and the workpiece gear. This indicates the number of teeth on the gear of the workpiece, where: , , =40894464, which means that the number of pulses required for the gear to rotate one revolution is 40894464. Dividing the number of pulses required for the gear to rotate one revolution by the number of teeth of the gear gives the number of pulses required for the gear to rotate one tooth. The high-precision internal gear grinding method for automotive gear internal gear machining mentioned in this application can be used regardless of whether the number of pulses required for the gear to rotate one tooth is an integer. However, when the number of pulses required for the gear to rotate one tooth is not an integer, the high-precision internal gear grinding method for automotive gear internal gear machining mentioned in this application can effectively improve the grinding accuracy of the gear.

[0070] See Figure 2 As shown, in some embodiments, the specific method for tooth division in S4 above is as follows: S41. After grinding the current tooth, compare the number of ground teeth with the preset number of teeth; after grinding the current tooth, increment the number of ground teeth by one, and compare the incremented number of ground teeth with the preset number of teeth; S42. When the number of ground teeth is less than the preset number of teeth, control the rotation of the workpiece gear according to the number of tooth division pulses so that the next tooth faces the gear, thus completing tooth division; the preset number of teeth is the total number of teeth of the workpiece gear. When the number of ground teeth is less than the preset number of teeth, it is determined that the teeth of the workpiece gear have not been ground completely. At this time, the tooth division pulse is obtained according to the calculation method in S4 above, and the rotation of the workpiece gear is controlled according to the number of tooth division pulses so that the next tooth faces the gear, preparing for the grinding of the next tooth. S43. When the number of ground teeth is greater than or equal to the preset number of teeth, the tooth division ends. When the number of ground teeth is greater than or equal to the preset number of teeth, it is determined that all internal teeth of the workpiece gear have been ground, and at this time, the tooth division is initiated, and the grinding process of the workpiece gear is also completed.

[0071] See Figure 3As shown, in some embodiments, the starting of the CNC grinding machine in S1 above further includes the following steps: S11, starting the CNC grinding machine; S12, determining whether there is an alarm message; S13, when there is an alarm message, displaying the alarm message on the touch screen; the alarm message includes, but is not limited to, axis alarm messages, such as X-axis, Y-axis, Z-axis, 4-axis, and 5-axis alarm messages, as well as limit switch alarm messages, such as X-axis limit switch alarm, Y-axis limit switch alarm, Z-axis limit switch alarm, 4-axis limit switch alarm, and 5-axis limit switch alarm messages, and also cooling and grinding wheel motor alarm messages, such as grinding wheel motor alarm messages, spindle belt breakage alarm messages, cooling motor alarm messages, cooling flow alarm messages, cooling oil tank level alarm messages, grinding wheel life alarm messages, and emergency stop switch alarm messages. S14, when there is no alarm message, the Y-axis, Z-axis, X-axis, 5-axis, and 4-axis return to zero sequentially. If no alarm messages are detected, the CNC grinding machine is considered to be operating normally. At this point, it is necessary to return the multiple axes of the CNC grinding machine to zero. During the zeroing process, it is crucial to ensure that the Y-axis, Z-axis, X-axis, 5-axis, and 4-axis return to zero in that order to avoid collisions. The zeroing operation can be performed automatically through the CNC grinding machine's control system or manually.

[0072] In some embodiments, S2 specifically includes the following steps: S21, the grinding wheel contacts the current tooth of the workpiece gear and reciprocates grinding the current tooth of the workpiece gear. Based on the gear parameters, the workpiece gear and the grinding wheel are moved to the initial grinding position through the linkage of the Y-axis, Z-axis, X-axis, 5-axis, and 4-axis. At this time, the Y-axis advances, and the Z-axis is linked with the 4-axis to complete the grinding of the full tooth depth and full tooth profile of the current tooth of the workpiece gear. During the grinding process, the grinding wheel is driven by the Z-axis to reciprocately grind the current tooth of the workpiece gear. The above grinding operation is the rough grinding of the gear. S22, the grinding wheel disengages from the current tooth of the workpiece gear; after completing the rough grinding, the grinding wheel disengages from the workpiece gear. S23. The grinding wheel moves to the grinding wheel dressing station for dressing. During rough grinding, the current tooth of the workpiece gear is not flat, causing the grinding wheel to be damaged. Grinding the gear with a damaged grinding wheel will affect the grinding accuracy. The grinding wheel dressing station is used to repair the shape of the grinding wheel. Dressing can be achieved using a dressing tool or dressing groove. For details, refer to CN213917763U - A Grinding Wheel Dresser and CN209503850U - Grinding Wheel Dressing Component. The specific structure of the grinding wheel dressing station is not limited here. The dressed grinding wheel returns to its original shape. S24. After dressing, the grinding wheel re-engages with the current tooth of the workpiece gear and reciprocates grinding the current tooth. After rough grinding, the current tooth shape of the workpiece gear tends to be flat. At this time, grinding the current tooth of the workpiece gear with the modified grinding wheel can achieve a better grinding effect. After two or more reciprocating grinding cycles, the grinding of the current tooth of the workpiece gear can be completed. The above-mentioned modified grinding operation is the fine grinding of the gear.

[0073] In this embodiment, by combining rough grinding and fine grinding, the internal teeth of the workpiece gear can be effectively and precisely ground. Combined with the aforementioned high-precision gear biting method, the grinding accuracy of the gear can be effectively improved, ultimately making the transmission error of the workpiece gear ≤5uard and the NVH pass rate reach over 95%.

[0074] In some embodiments, in S24 above, after the grinding wheel is dressed, a compensation signal is generated based on the shape change of the gear, and the movement of the grinding wheel is compensated based on the compensation signal to ensure that the grinding wheel and the current tooth of the workpiece gear re-establish effective contact. During the grinding wheel dressing process, the radial gear of the grinding wheel decreases, and a compensation signal is generated based on the decrease in the radial gear of the grinding wheel. The Y-axis movement of the grinding wheel is compensated based on the compensation signal to ensure that the grinding wheel and the current tooth of the workpiece gear re-establish effective contact during the fine grinding process, thereby ensuring its grinding effect.

[0075] See Figure 4As shown, in some embodiments, an automatic cyclic gear grinding method is also included. This automatic cyclic gear grinding method is an automated gear grinding method that can effectively reduce manual intervention, thereby improving the stability of gear grinding results. The automatic cyclic gear grinding method includes the following steps: A1. Comparing the number of teeth that have been ground with a preset number of teeth; Before performing automatic cyclic gear grinding, the automatic cyclic switch needs to be turned on. After turning it on, the CNC grinding machine detects and determines whether there is any alarm information. If there is an alarm, the alarm information is displayed on the touch screen. If there is no alarm, the number of teeth that have been ground is compared with the preset number of teeth. A2. When the number of teeth that have been ground is greater than or equal to the preset number of teeth, the gear grinding is complete; When the number of teeth that have been ground is greater than or equal to the preset number of teeth, it is determined that all internal teeth of the workpiece gear have been ground. At this time, a signal is issued that all teeth of the current workpiece gear have been ground, and the automated gear grinding program ends. A3. When the number of teeth ground is less than the preset number, the grinding wheel contacts the current tooth of the workpiece gear, completing the grinding of the current tooth. When the number of teeth ground is less than the preset number, it is determined that there are still teeth on the workpiece gear that need grinding. At this time, based on the gear parameters, the workpiece gear and the grinding wheel are moved to the initial grinding position through the linkage of the Y-axis, Z-axis, X-axis, 5-axis, and 4-axis. At this time, the Y-axis advances, and the Z-axis and 4-axis are linked to complete the rough grinding of the full tooth depth and full tooth profile of the current tooth of the workpiece gear. After the rough grinding is completed, the grinding wheel disengages from the workpiece gear. The grinding wheel moves to the grinding wheel dressing station for dressing, and the dressed grinding wheel returns to its original shape. After the rough grinding, the dressed grinding wheel is used to grind the current tooth of the workpiece gear to obtain a better grinding effect. After two or more reciprocating grinding cycles, the fine grinding of the current tooth of the workpiece gear is completed. Before fine grinding, the radial gear of the grinding wheel decreases due to the shaping process. A compensation signal is generated based on the decrease in the radial gear of the grinding wheel. The Y-axis movement of the grinding wheel is compensated based on the compensation signal to ensure that the grinding wheel and the current tooth of the workpiece gear re-establish effective contact during the fine grinding process, thus ensuring the grinding effect. A4. After the grinding of the current tooth is completed, the grinding wheel separates from the workpiece gear. After completing the rough grinding and fine grinding of the current tooth, it is determined that the grinding of the current tooth is complete. A5. The number of teeth that have been ground is incremented by one, and the number of teeth that have been ground is compared with the preset number of teeth. After the grinding of the current tooth of the workpiece gear is completed, the number of teeth that have been ground is incremented by one, and then the number of teeth that have been ground is compared with the preset number of teeth again to determine whether all internal teeth of the workpiece gear have been ground. A6. Grinding is complete when the number of teeth ground is greater than or equal to the preset number of teeth. A7. Grinding begins when the number of teeth ground is less than the preset number of teeth. During gear splitting, splitting pulses are obtained according to the calculation method in S4 above. The rotation of the workpiece gear is controlled based on the number of splitting pulses to ensure the next tooth faces the gear, preparing for grinding the next tooth. A8. Repeat steps A3-A7 until all teeth of the workpiece gear are ground.

[0076] In some embodiments, the touchscreen is equipped with an electronic handwheel, which, along with the PLC, controls the movement of the X, Y, Z, 4, and 5 axes. The operator sets the grinding program, selects gear parameters, or chooses manual mode via the touchscreen. When fine manual operation is required (such as tool setting or fine-tuning), the operator picks up the electronic handwheel, selects the axis to move and the movement ratio, and rotates the handwheel to generate a pulse signal. The PLC receives instructions from the touchscreen and the pulse signal from the electronic handwheel. The PLC processes these input signals according to the current operating mode (automatic / manual / handwheel) and the logic program. In manual / handwheel mode, the PLC sends the processed handwheel pulse signal to the servo motor of the corresponding axis. After receiving the handwheel pulse signal from the PLC, the servo motor precisely rotates the angle corresponding to the handwheel pulse signal. The output shaft of the servo motor drives a ball screw or other mechanism that converts rotation into linear motion, driving the worktable or grinding wheel head to make precise micro-movements. The encoder on the motor provides real-time position and speed feedback to the servo driver, forming a closed-loop control to ensure the accuracy of the movement. In CNC automatic mode, the PLC executes a preset machining program, sending continuous motion commands to the servo motors of each axis to control the servo motors to complete complex grinding trajectories. Simultaneously, the PLC monitors the status of all sensors within the CNC machine tool, handles alarms, and displays the system status in real-time on the touchscreen for the operator to view.

[0077] The above description is only a part or preferred embodiment of this application. Neither the text nor the drawings should limit the scope of protection of this application. All equivalent structural transformations made using the content of this application's specification and drawings under the overall concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A high-precision internal gear grinding method for machining internal gears in automobiles, wherein the method is implemented on a CNC grinding machine integrating a touch screen, a grinding wheel dressing station, X-axis, Y-axis, Z-axis, 4-axis, and 5-axis machining centers, characterized in that... The grinding process includes the following steps: S1. Start the CNC grinding machine, select the machining program and set the gear machining parameters; S2. The grinding wheel contacts the current tooth of the workpiece gear, completing the grinding of the current tooth of the workpiece gear; S3. After the grinding of the current tooth is completed, the grinding wheel separates from the workpiece gear; S4. The workpiece gear is toothed, wherein the calculation method for the number of tooth-splitting pulses is as follows: In the formula: This represents the number of tooth-dividing pulses during the (n+1)th tooth division. Indicates the basic pulse number. This represents the number of the nth tooth-dividing pulse. This indicates the number of tooth-splitting pulses during the first tooth splitting. Represents the floor function; S5. Repeat S2, S3 and S4 to complete the grinding of the internal teeth of the workpiece gear.

2. The high-precision internal gear grinding method for automotive gear internal gear machining according to claim 1, characterized in that, The calculation method for the basic pulse number in S4 above is as follows: In the formula: This indicates the number of pulses required for the output shaft of the toothed motor to rotate one revolution. This indicates the transmission ratio between the output shaft of the geared motor and the workpiece gear. This indicates the number of teeth on the gear in the workpiece.

3. The high-precision internal gear grinding method for automotive gear internal gear machining according to claim 1, characterized in that, The specific method for tooth splitting in S4 above is as follows: S41. After completing the grinding of the current tooth, compare the number of teeth ground with the preset number of teeth. S42. When the number of ground teeth is less than the preset number of teeth, control the workpiece gear to rotate according to the number of tooth splitting pulses, so that the next tooth faces the gear, and complete the tooth splitting; S43. When the number of ground teeth is greater than or equal to the preset number of teeth, the tooth splitting ends.

4. The high-precision internal gear grinding method for automotive gear internal gear machining according to claim 1, characterized in that, In step S1 above, starting the CNC grinding machine also includes the following steps: S11. Start the CNC grinding machine; S12. Determine if there is an alarm message; S13. When an alarm is detected, the alarm information is displayed on the touchscreen. S14. When there is no alarm information, the Y-axis, Z-axis, X-axis, 5-axis and 4-axis return to zero in sequence.

5. The high-precision internal gear grinding method for automotive gear internal gear machining according to claim 1, characterized in that, The above S2 specifically includes the following steps: S21. The grinding wheel contacts the current tooth of the workpiece gear and reciprocates grinding the current tooth of the workpiece gear. S22, The grinding wheel disengages from the current tooth of the workpiece gear; S23. The grinding wheel is moved to the grinding wheel dressing station for dressing. S24. After the grinding wheel is dressed, the grinding wheel re-engages with the current tooth of the workpiece gear and reciprocates grinding the current tooth of the workpiece gear.

6. The high-precision internal gear grinding method for automotive gear internal gear machining according to claim 5, characterized in that, In S24 above, after the grinding wheel is modified, a compensation signal is generated based on the shape change of the gear, and the movement of the grinding wheel is compensated based on the compensation signal to ensure that the current tooth of the grinding wheel and the workpiece gear re-establishes effective contact.

7. The high-precision internal gear grinding method for machining internal gears in automobiles according to any one of claims 1-6, characterized in that, It also includes an automatic cyclic gear grinding method, which includes the following steps: A1. Compare the number of teeth that have been ground to the preset number of teeth; A2. Grinding is complete when the number of teeth that have been ground is greater than or equal to the preset number of teeth. A3. When the number of teeth that have been ground is less than the preset number of teeth, the grinding wheel contacts the current tooth of the workpiece gear to complete the grinding of the current tooth of the workpiece gear. A4. After the grinding of the current tooth is completed, the grinding wheel separates from the workpiece gear; A5. Increment the number of teeth that have been ground by one, and recompare the number of teeth that have been ground with the preset number of teeth. A6. Grinding is complete when the number of teeth that have been ground is greater than or equal to the preset number of teeth. A7. When the number of teeth that have been ground is less than the preset number of teeth, the workpiece gear will split teeth; A8. Repeat steps A3-A7.

8. The high-precision internal gear grinding method for machining internal gears in automobiles according to any one of claims 1-6, characterized in that, The touchscreen is equipped with an electronic handwheel, which, along with the PLC, controls the movement of the X-axis, Y-axis, Z-axis, 4-axis, and 5-axis.

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