A special forming grinding wheel gear grinding machine for RV reducer cycloid wheel and its processing method

Abstract

The present invention discloses a special profiled grinding wheel gear grinding machine for cycloid wheels of RV reducers and a processing method thereof, relating to the technical field of cycloid wheel processing: comprising a work bed, the work bed being connected to a column, the upper surface of which is further fixed with a workbench and a dressing device; a slide being connected to the column, a grinding wheel driving device being fixed to the slide, the output shaft of the grinding wheel driving device being connected with a profiled grinding wheel; a discrete indexing device and a cycloid wheel fixture being connected to the work bed, the upper end of the cycloid wheel fixture being used to clamp a cycloid wheel workpiece; the discrete indexing device comprising a lifting and rotating driving device, a lower end face gear disc, an upper end face gear disc and a connecting disc, the lower end face gear disc being fixed to the work bed, the upper end face gear disc being fixed to the lower surface of the connecting disc, the upper surface of the connecting disc being fixed to the lower end of the cycloid wheel fixture, the output shaft of the lifting and rotating driving device being connected and fixedly connected to the lower surface of the connecting disc; and a dressing device being used to dress the profiled grinding wheel. The present invention can achieve precise positioning of the cycloid wheel workpiece.

Description

Technical Field

[0001] The present invention relates to the technical field of cycloid wheel processing, in particular to a special forming grinding wheel gear grinding machine for cycloid wheels of RV reducers and a processing method thereof. Background Art

[0002] The RV reducer is a new two-stage transmission mechanism with numerous advantages, including high efficiency, precision, and rigidity. It is widely used in high-end equipment and industrial robotics. The cycloid gear is a core component of the RV reducer, and the machining accuracy of its tooth profile has a significant impact on the overall performance of the RV. Improving the machining efficiency and precision of the cycloid gear tooth profile and reducing manufacturing costs have always been the focus of the gear manufacturing industry.

[0003] Gear grinding is a gear machining process used for finishing gears after rough machining and heat treatment. Because heat treatment can cause gear deformation, which can seriously affect gear accuracy, gear grinding is necessary to correct this deformation and ensure the required gear accuracy.

[0004] The existing cycloidal wheel grinding device, such as the "A grinding machine for grinding cycloidal wheels" disclosed in Patent No. CN103286661A, includes a bed, a column arranged on the bed, and a first grinding wheel spindle and a second grinding wheel spindle arranged on the column. A workpiece clamp is provided on the bed, and a sliding mechanism is provided on the bed to enable the workpiece clamp to move relative to the first grinding wheel spindle and the second grinding wheel spindle. A forming grinding wheel with a toothed outer edge of the cross-section is provided on the first grinding wheel spindle, and a cylindrical grinding wheel is provided on the second grinding wheel spindle. The cycloidal wheel is fixed by the workpiece clamp, and the sliding mechanism is controlled to make the first grinding wheel spindle approach the cycloidal wheel. The forming grinding wheel grinds multiple tooth grooves of the cycloidal wheel at one time by a forming method, and the sliding mechanism is controlled to make the second grinding wheel spindle approach the cycloidal wheel. The cylindrical grinding wheel grinds the eccentric circular hole in the cycloidal wheel. The outer contour tooth grooves and the eccentric circular hole of the cycloidal wheel are ground by one clamping. The operation is convenient and the processing efficiency is high. The present invention is used in the field of grinding processing machinery technology.

[0005] However, this gear grinding machine has many moving axes, and the grinding and dressing processes are performed independently. Furthermore, the turntable used to drive the cycloidal wheel adopts a continuous rotation design similar to that of general machine tools, such as a motor-driven work spindle. However, this structure requires precise sensors to accurately position the turntable. This not only increases manufacturing costs and operational complexity, but also makes it difficult to accurately position the cycloidal wheel.

[0006] Therefore, the market is in urgent need of a special profiled grinding wheel gear grinding machine for cycloid wheels of RV reducers and a processing method thereof to solve the above problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a special forming grinding wheel gear grinding machine for the cycloidal wheel of an RV reducer and a processing method thereof, which are used to solve the technical problems existing in the above-mentioned prior art. The overall number of motion axes is small, and the precise positioning of the cycloidal wheel workpiece is achieved through the mechanical cooperation of the upper end face gear disc and the lower end face gear disc. There is no need to add additional precision sensors, which is convenient for operation and control, and has low manufacturing cost.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] The present invention discloses a special forming grinding wheel gear grinding machine for cycloid wheels of RV reducers, comprising a working bed, a column being slidably connected to the working bed, and a working table and a dressing device being fixed on the upper surface of the working bed;

[0010] The workbench is connected to a discrete indexing device and a cycloid wheel positioning fixture, and the cycloid wheel fixture is located at the upper end of the discrete indexing device.

[0011] The discrete indexing device includes a lifting and rotating device, a lower end face gear disc, an upper end face gear disc and a connecting disc, the lower end face gear disc is fixed to the workbench, the upper end face gear disc is fixed to the lower surface of the connecting disc, the upper surface of the connecting disc is fixed to the lower end of the cycloid wheel fixture, the output shaft of the lifting and rotating drive device is connected and fixedly connected to the lower surface of the connecting disc, the number of teeth of the lower end face gear disc is the same as the number of teeth of the upper end face gear disc, and the number of teeth of the lower end face gear disc and the number of teeth of the upper end face gear disc are both integer multiples of 39;

[0012] The cycloid wheel fixture includes a support platform, the support platform is fixed to the upper surface of the connecting disk, the upper end of the support platform is provided with a core shaft, the core shaft is provided with a dense bead sleeve, the cycloid wheel workpiece can be sleeved on the outside of the dense bead sleeve, the dense bead sleeve is used to achieve the centering effect of the cycloid wheel workpiece, the upper end of the support platform is provided with a positioning hole, the positioning hole and the coordinate hole on the cycloid wheel workpiece are provided with a diamond pin, the diamond pin is used to achieve the positioning effect of the support platform and the cycloid wheel workpiece;

[0013] The dressing device includes a dressing bracket, a roller driving device is provided on the dressing bracket, the output shaft of the roller driving device is connected to a formed diamond roller, the diameter of the formed diamond roller is the same as the diameter of the cycloidal wheel workpiece, the formed diamond roller is located above the cycloidal wheel workpiece, the axial direction of the formed diamond roller is perpendicular to the axial direction of the cycloidal wheel workpiece, the tooth profile portion of the diamond roller projected along the horizontal plane includes a roller end profile, and a curved transition portion is provided on both sides of the roller end profile. The roller end profile has the same shape as a single tooth profile portion of the cycloidal wheel workpiece projected along the horizontal plane.

[0014] Preferably, the width of the formed diamond roller is greater than the width of the formed grinding wheel, and the width of the formed grinding wheel is greater than the tooth profile width of the cycloid wheel workpiece.

[0015] The present invention also discloses a processing method of the special forming grinding wheel gear grinding machine for the RV reducer cycloid wheel, comprising the following steps:

[0016] S1. By adjusting the positions of the column and the slide, the forming grinding wheel is brought into contact with the forming diamond roller, and the forming grinding wheel is dressed using the forming diamond roller;

[0017] S2. After the forming grinding wheel is dressed, the column is fixed and the slide is driven downward to make the forming grinding wheel contact with the cycloid wheel workpiece, thus realizing the cycloid wheel grinding movement;

[0018] S3. After the grinding of one cycloid tooth is completed, the forming grinding wheel moves to the middle position between the forming diamond roller and the cycloid wheel workpiece. The upper end face tooth disc is driven by the lifting and rotating device to rotate the expected angle and then engage and press with the lower end face tooth disc, driving the forming grinding wheel to continue to move downward to complete the grinding movement of the next cycloid tooth;

[0019] S4. After grinding a number of cycloid teeth, the slide is driven to move upward to move the forming grinding wheel to the height of the forming diamond roller, and the column is driven to move toward the dressing device to dress the forming grinding wheel using the forming diamond roller;

[0020] S5. Repeat steps S2 to S4 until the grinding process of the entire cycloid wheel workpiece is completed.

[0021] Compared with the prior art, the present invention has achieved the following technical effects:

[0022] The present invention is provided with an upper end face gear disc and a lower end face gear disc. The end face gear disc is a precision indexing device that can achieve the highest accuracy (0.1") in the field of pure mechanical indexing. However, the indexable number of the end face gear disc is related to its number of teeth, so it is limited in practical applications. The cycloid wheels in the mainstream RV reducers on the market all use a fixed number of teeth of 39. The present invention uses an end face gear disc with an integer multiple of 39 teeth to realize the indexing of the cycloid wheel tooth grinding process, thereby achieving a very high indexing accuracy and reducing the dependence of related machine tools on precision indexing sensors. When it is necessary to adjust the angle of the cycloid wheel workpiece, first adjust the upper end face gear disc to the lower end face gear disc. The upper end face gear disc and the lower end face gear disc are separated, and then the torque motor is used to rotate the upper end face gear disc. Since the number of teeth on the upper end face gear disc is an integer multiple of the number of teeth on the cycloid workpiece, it is only necessary to rotate the upper end face gear disc by a fixed angle to achieve precise rotation of the cycloid workpiece. More importantly, since the torque motor used is a non-self-locking motor, if there is a slight error in the angle at which the torque motor drives the upper end face gear disc to rotate, it is only necessary to drive the upper end face gear disc down by the lifting cylinder, and the error problem can be quickly eliminated by utilizing the self-centering principle of engagement between the upper end face gear disc and the lower end face gear disc, thereby achieving precise positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a structural diagram of a special profiled grinding wheel gear grinding machine for cycloid wheels of an RV reducer according to Example 1;

[0025] Figure 2 This is a side view of a profiled grinding wheel gear grinding machine specifically designed for cycloid wheels of RV reducers according to Example 1;

[0026] Figure 3 This is a schematic structural diagram of a discrete indexing device in a special profiled grinding wheel gear grinding machine for an RV reducer cycloid wheel according to Example 1;

[0027] Figure 4 This is a schematic structural diagram of a cycloidal wheel fixture in a special forming grinding wheel gear grinding machine for a cycloidal wheel of an RV reducer according to Example 1;

[0028] Figure 5 This is a width relationship diagram between the cycloid wheel workpiece, the formed diamond roller, and the formed grinding wheel in the cycloid wheel special forming grinding wheel gear grinding machine for the RV reducer in Example 1;

[0029] Figure 6This is a tooth profile relationship diagram between the cycloid wheel workpiece and the formed diamond roller in the cycloid wheel profile grinding machine for the RV reducer cycloid wheel in Example 1;

[0030] In the figure: 1-working bed; 2-column; 3-working table; 4-slide; 5-cycloid wheel fixture; 501-cycloid wheel workpiece; 502-bead sleeve; 503-pressure plate; 504-tightening nut; 505-support table; 506-diamond pin; 6-dressing device; 601-forming diamond roller; 7-forming grinding wheel; 8-discrete indexing device; 801-lifting shell; 802-lifting cylinder; 803-torque motor; 804-rotating lifting column; 805-linear bearing; 806-lower end face gear disc; 807-upper end face gear disc; 808-connecting disc. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] The purpose of the present invention is to provide a special forming grinding wheel gear grinding machine for the cycloidal wheel of an RV reducer and a processing method thereof, which are used to solve the technical problems existing in the above-mentioned prior art. The overall number of motion axes is small, and the precise positioning of the cycloidal wheel workpiece is achieved through the mechanical cooperation of the upper end face gear disc and the lower end face gear disc. There is no need to add additional precision sensors, which is convenient for operation and control, and has low manufacturing cost.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Example 1

[0035] like Figures 1-6 As shown, this embodiment provides a special forming grinding wheel gear grinding machine for cycloid wheel of RV reducer, including a working bed 1, a column 2 is slidably connected to the working bed 1, as shown in FIG. Figure 1 As shown, the column 2 can move along the Y-axis direction (ie, the length direction) of the work bed 1 , and a workbench 3 and a trimming device 6 are also fixed to the upper surface of the work bed 1 .

[0036] The column 2 is slidably connected to a slide 4, which can slide up and down along the column 2 (i.e. Figure 1 A grinding wheel driving device is fixed on the slide 4, and a forming grinding wheel 7 is connected to the output shaft of the grinding wheel driving device. The grinding wheel driving device is used to drive the forming grinding wheel 7 to rotate.

[0037] The workbench 3 is connected to a discrete indexing device 8 and a cycloid wheel fixture 5 . The cycloid wheel fixture 5 is located at the upper end of the discrete indexing device 8 . The upper end of the cycloid wheel fixture 5 is used to clamp the cycloid wheel workpiece 501 .

[0038] like Figure 4 As shown, the cycloid wheel fixture 5 includes a support platform 505, which is fixed to the upper surface of the connecting disk 808. In addition, a guide column is provided at the lower end of the support platform 505, and a guide through hole is provided at the center of the connecting disk 808. The guide column can be inserted into the guide through hole to achieve rapid positioning of the support platform 505 and the connecting disk 808. A core shaft is provided at the upper end of the support platform 505, and a dense bead sleeve 502 is provided on the core shaft. The cycloid wheel workpiece 501 is sleeved on the outer side of the dense bead sleeve 502. The dense bead sleeve 502 is a prior art. The dense bead sleeve 502 is used to achieve the centering effect of the cycloid wheel workpiece 501, that is, to make the central axis of the cycloid wheel workpiece 501 coaxial with the central axis of the core shaft. The cycloid workpiece 501 can be sleeved on a core shaft, which is sleeved with a pressure plate 503. The pressure plate 503 is located at the upper end of the cycloid workpiece 501, and the pressure of the pressure plate 503 is used to achieve relative fixation between the cycloid workpiece 501 and the support platform 505. A clamping nut 504 is threadedly connected to the core shaft, and the clamping thread is located on the upper surface of the pressure plate 503. It can be imagined that the upper end of the core shaft has an external thread and the clamping nut 504 has an internal thread, so as to achieve a threaded connection between the clamping nut 504 and the core shaft, and the clamping nut 504 can be used to make the pressure plate 503 only press the cycloid workpiece 501. In addition, a positioning hole is provided on the cycloid workpiece 501, and a coordinate hole is provided on the upper end of the support platform 505. A diamond pin 506 is provided on the positioning hole and the coordinate hole, that is, the diamond pin 506 will pass through the positioning hole and the coordinate hole in sequence, so as to achieve the technical effect of quickly and accurately positioning the cycloid workpiece 501 and the support platform 505.

[0039] like Figure 3As shown, the discrete indexing device 8 includes a lifting and rotating drive device, a lower end face gear disc 806, an upper end face gear disc 807 and a connecting disc 808. The lower end face gear disc 806 is fixed to the upper surface of the workbench 3 by a hexagon socket head screw, the upper end face gear disc 807 is fixed to the lower surface of the connecting disc 808 by a hexagon socket head screw, and the upper surface of the connecting disc 808 is fixed to the lower end of the cycloid wheel fixture 5 by a hexagon socket head screw. The output shaft of the lifting and rotating drive device is fixedly connected to the lower surface of the connecting disc 808, and the upper end face gear disc 807 is fixed to the lower surface of the connecting disc 808 by a hexagon socket head screw. The lower surface of the disk 807 and the upper surface of the lower end face toothed disk 806 are both provided with corresponding disk teeth. The disk teeth of the upper end face toothed disk 807 can engage with the disk teeth of the lower end face toothed disk 806. The number of teeth of the lower end face toothed disk 806 is the same as the number of teeth of the upper end face toothed disk 807. The number of teeth of the lower end face toothed disk 806 is an integer multiple of the number of teeth of the cycloid wheel workpiece 501 (such as 1 times, 2 times, 3 times, etc.). Since the number of teeth of the existing cycloid wheel workpiece 501 is 39, the number of teeth of the lower end face toothed disk 806 and the number of teeth of the upper end face toothed disk 807 are both integer multiples of 39.

[0040] The dressing device 6 includes a dressing bracket, on which a roller driving device is provided. The output shaft of the roller driving device is connected to a formed diamond roller 601 , and the roller driving device can drive the formed diamond roller 601 to rotate.

[0041] It should be noted that the grinding wheel drive device and the roller drive device are the same, and the existing spindle box can be used. Of course, it can also be replaced by a motor or other structures with rotational driving force.

[0042] like Figure 5 As shown, the width of the formed diamond roller 601 is greater than the width of the formed grinding wheel 7. Figure 5 The dotted line position at the right end of the middle forming diamond roller 601 represents the position where it is widened relative to the width of the forming grinding wheel 7. Similarly, the width of the forming grinding wheel 7 is greater than the tooth profile width of the cycloid wheel workpiece 501. Here, the tooth profile width of the cycloid wheel workpiece 501 is one tooth profile width, and the tooth profile width of the cycloid wheel workpiece 501 is Figure 5 The width between the two dotted lines in the cycloid wheel workpiece 501 is the width of one tooth plus the width of one tooth groove. Figure 5 The dotted line position at the right end of the middle forming grinding wheel 7 represents the position where the tooth profile width thereof is widened relative to the cycloid wheel workpiece 501 .

[0043] The purpose of widening is to increase the attachment surface between the forming diamond roller 601 and the forming grinding wheel 7, and between the forming grinding wheel 7 and the cycloid wheel workpiece 501, thereby enhancing the dressing and grinding effects.

[0044] It should be noted here that Figure 5It is not an actual position relationship diagram, and its function is limited to expressing the width relationship between the formed diamond roller 601, the formed grinding wheel 7 and the cycloid wheel workpiece 501.

[0045] Further, such as Figure 6 As shown, the diameter of the formed diamond roller 601 is the same as the diameter of the cycloid wheel workpiece 501; the axial direction of the formed diamond roller 601 is perpendicular to the axial direction of the cycloid wheel workpiece 501; and the formed diamond roller 601 is located above the cycloid wheel workpiece 501.

[0046] In addition, the tooth profile of the diamond roller 601 projected along the horizontal plane includes the roller end profile, and a curved transition portion is provided on each side of the roller end profile (the curved transition portion is the widened portion thereof). The roller end profile has the same shape as the single tooth profile portion of the cycloid wheel workpiece 501 projected along the horizontal plane. To explain it here, the single tooth profile portion of the cycloid wheel workpiece 501 includes two teeth and a groove portion between the two teeth. The roller end profile is the portion where the diamond roller 601 and the cycloid wheel workpiece 501 completely overlap when viewed from above. The curved transition portion is Figure 6 The upper and lower ends of the middle roller end profile are the parts that are larger than the single tooth profile of the cycloid wheel workpiece 501.

[0047] The purpose of this arrangement is that after the shaping grinding wheel 7 has been grinding the cycloid workpiece 501 for a period of time, its shape will be worn, and at this time it needs to be trimmed using the shaping diamond roller 601. Specifically, the slide 4 is first driven upward to make the shaping grinding wheel 7 and the shaping diamond roller 601 equal in height. Then, the column 2 is driven toward the trimming device 6 to make the shaping grinding wheel 7 contact the shaping diamond roller 601. Finally, the roller drive device is activated to trim the shaping grinding wheel 7 using the shaping diamond roller 601. When the trimming work is completed, the slide 4 only needs to be adjusted to move downward to continue processing the cycloid workpiece 501.

[0048] This arrangement has two advantages: first, when the forming grinding wheel 7 needs to be dressed, due to the setting position of the forming diamond roller 601 and its own size factors, the column 2 and the slide 4 do not need to move too much, and the operation is simple. After the dressing work is completed, the forming grinding wheel 7 only needs to move downward to continue grinding, and no time is wasted; second, when the forming grinding wheel 7 needs to be dressed, it is necessary to drive the column 2 toward the dressing device 6 to make the forming grinding wheel 7 contact with the forming diamond roller 601, and there is no need for special precise requirements for the moving distance of the column 2. Even if the column 2 moves a little more, the forming diamond roller 601 can still dress it, and the dressing effect is the same, which can reduce the requirements for CNC precision.

[0049] In this embodiment, if Figure 3 As shown, the lifting and rotating drive device includes a lifting cylinder 802, a torque motor 803 and a rotating lifting column 804. The torque motor 803 is fixed on the telescopic end of the lifting cylinder 802. The lifting cylinder 802 can also be replaced by a hydraulic cylinder or an electric telescopic rod. The output shaft of the torque motor 803 is connected to the lower surface of the connecting plate 808 through the rotating lifting column 804.

[0050] In actual use, the lifting cylinder 802 can drive the torque motor 803 and the rotary lifting column 804 to move up and down, and finally drive the upper end surface gear plate 807 to move up and down through the connecting plate 808. The torque motor 803 can drive the connecting plate 808 and the upper end surface gear plate 807 to rotate through the rotating lifting column 804, thereby driving the cycloid workpiece 501 to rotate.

[0051] It should be noted here that the torque motor 803 is a non-self-locking motor. Once a slight error occurs in the rotation angle of the torque motor 803, this problem can be overcome by engaging the upper end face gear disc 807 and the lower end face gear disc 806. At this time, in order to fully engage with the lower end face gear disc 806, the upper end face gear disc 807 must rotate slightly, so the selected torque motor 803 must be a non-self-locking motor to cooperate with this rotation.

[0052] In this embodiment, if Figure 3 As shown, a lifting shell 801 is provided in the working bed 1, and a cavity corresponding to the lifting shell 801 is provided in the working bed 1. The lifting cylinder 802 and the torque motor 803 are both arranged in the lifting shell 801, and the torque motor 803 is located at the upper end of the lifting cylinder 802.

[0053] Furthermore, the workbench 3 is provided with a through hole for the rotary lifting column 804 to pass through, and a linear bearing 805 is provided between the rotary lifting column 804 and the workbench 3. The linear bearing 805 can effectively reduce the friction between the rotary lifting column 804 and the workbench 3.

[0054] In this embodiment, the lower end of the column 2 is slidably connected to the upper end of the workbed 1 through a linear motor. The linear motor is a prior art and any linear motor of suitable size on the market can be used.

[0055] The slide 4 is slidably connected to the side of the column 2 through a screw-nut substructure. The screw-nut substructure is also a common structure in machine tools, including a linear drive motor, a rotating screw and a nut seat, wherein the linear drive motor is fixed to the column 2, and the output shaft of the linear drive motor is transmission-connected to one end of the rotating screw. The rotating screw is vertically arranged, and the nut seat is provided with a threaded hole and is threadedly connected to the rotating screw. The nut seat is also fixedly connected to the slide 4 and in contact with the column 2. When the linear drive motor is started, the linear drive motor will drive the rotating screw to rotate, thereby driving the nut seat to move up and down along the axis of the rotating screw, thereby driving the slide 4 to move up and down. In this process, due to the limiting effect of the slide 4 and the column 2 on the nut seat, it can be prevented from rotating during the rotation of the rotating screw.

[0056] Furthermore, the aforementioned linear motor, linear drive motor, roller drive device, grinding wheel drive device and other electronic control devices can be electrically connected to the controller, thereby enabling remote control by the staff. The controller can be an existing PLC controller, single-chip microcomputer controller, computer or industrial computer.

[0057] Example 2

[0058] This embodiment provides a processing method of a special profiled grinding wheel gear grinding machine for an RV reducer cycloid wheel based on the first embodiment, comprising the following steps:

[0059] S1. By adjusting the positions of the column 2 and the slide 4, the position of the column 2 is adjusted by the linear motor, and the position of the slide 4 is adjusted by the screw nut structure, the forming grinding wheel 7 is finally brought into contact with the forming diamond roller 601, the roller driving device is started, and the forming diamond roller 601 is used to dress the forming grinding wheel 7;

[0060] S2. After the shaping grinding wheel 7 is dressed, the column 2 is fixed and the slide 4 is driven to move downward, so that the shaping grinding wheel 7 contacts the cycloid wheel workpiece 501, and the cycloid wheel grinding movement is realized;

[0061] S3. After the grinding of one cycloid tooth is completed, the forming grinding wheel 7 moves to the middle position between the forming diamond roller 601 and the cycloid wheel workpiece 501, and the upper end face gear disc 807 is driven to move upward by the lifting cylinder 802, and then the torque motor 803 is driven to drive the upper end face gear disc 807 to rotate the expected angle, and the lifting cylinder 802 is used to drive the upper end face gear disc 807 to move downward, so that the lower end face gear disc 806 is meshed with the upper end face gear disc 807. The process of meshing the lower end face gear disc 806 with the upper end face gear disc 807 can also overcome the problem of rotation error that may be generated by the torque motor 803, and drive the forming grinding wheel 7 to continue to move downward to complete the grinding feed motion of the next cycloid tooth;

[0062] S4. After grinding a number of cycloid teeth, the forming grinding wheel 7 will be worn and needs to be dressed. The slide 4 is driven upward by the screw nut substructure to move the forming grinding wheel 7 to the height of the forming diamond roller 601. The column 2 is driven by the linear motor to move toward the dressing device 6, and the forming diamond roller 601 is used to dress the forming grinding wheel 7.

[0063] S5. After the dressing process is completed, the forming grinding wheel 7 can be controlled to move downward, and steps S2 to S4 are repeated until the grinding process of the entire cycloid wheel workpiece 501 is completed.

[0064] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A special profiled grinding wheel gear grinding machine for cycloid wheels of RV reducers, characterized by: It includes a working bed, on which a column is slidably connected, and a working table and a finishing device are fixed on the upper surface of the working bed; The workbench is connected to a discrete indexing device and a cycloid wheel positioning fixture, and the cycloid wheel fixture is located at the upper end of the discrete indexing device. The discrete indexing device includes a lifting and rotating device, a lower end face gear disc, an upper end face gear disc and a connecting disc, the lower end face gear disc is fixed to the workbench, the upper end face gear disc is fixed to the lower surface of the connecting disc, the upper surface of the connecting disc is fixed to the lower end of the cycloid wheel fixture, the output shaft of the lifting and rotating drive device is connected and fixedly connected to the lower surface of the connecting disc, the number of teeth of the lower end face gear disc is the same as the number of teeth of the upper end face gear disc, and the number of teeth of the lower end face gear disc and the number of teeth of the upper end face gear disc are both integer multiples of 39; The cycloid wheel fixture includes a support platform, the support platform is fixed to the upper surface of the connecting disk, the upper end of the support platform is provided with a core shaft, the core shaft is provided with a dense bead sleeve, the cycloid wheel workpiece can be sleeved on the outside of the dense bead sleeve, the dense bead sleeve is used to achieve the centering effect of the cycloid wheel workpiece, the upper end of the support platform is provided with a positioning hole, the positioning hole and the coordinate hole on the cycloid wheel workpiece are provided with a diamond pin, the diamond pin is used to achieve the positioning effect of the support platform and the cycloid wheel workpiece; The dressing device includes a dressing bracket, a roller driving device is provided on the dressing bracket, the output shaft of the roller driving device is connected to a formed diamond roller, the diameter of the formed diamond roller is the same as the diameter of the cycloidal wheel workpiece, the formed diamond roller is located above the cycloidal wheel workpiece, the axial direction of the formed diamond roller is perpendicular to the axial direction of the cycloidal wheel workpiece, the tooth profile portion of the diamond roller projected along the horizontal plane includes a roller end profile, and a curved transition portion is provided on both sides of the roller end profile. The roller end profile has the same shape as a single tooth profile portion of the cycloidal wheel workpiece projected along the horizontal plane.

2. The RV reducer cycloid wheel special profile grinding machine according to claim 1, characterized in that: The width of the formed diamond roller is greater than the width of the formed grinding wheel, and the width of the formed grinding wheel is greater than the tooth profile width of the cycloid wheel workpiece.

3. A processing method of the RV reducer cycloid wheel special profile grinding machine according to any one of claims 1-2, characterized in that: The following steps are involved: S1. By adjusting the positions of the column and the slide, the forming grinding wheel is brought into contact with the forming diamond roller, and the forming grinding wheel is dressed using the forming diamond roller; S2. After the forming grinding wheel is dressed, the column is fixed and the slide is driven downward to make the forming grinding wheel contact with the cycloid wheel workpiece, thus realizing the cycloid wheel grinding movement; S3. After the grinding of one cycloid tooth is completed, the forming grinding wheel moves to the middle position between the forming diamond roller and the cycloid wheel workpiece. The upper end face tooth disc is driven by the lifting and rotating device to rotate the expected angle and then engage and press with the lower end face tooth disc, driving the forming grinding wheel to continue to move downward to complete the grinding movement of the next cycloid tooth; S4. After grinding a number of cycloid teeth, the slide is driven to move upward to move the forming grinding wheel to the height of the forming diamond roller, and the column is driven to move toward the dressing device to dress the forming grinding wheel using the forming diamond roller; S5. Repeat steps S2 to S4 until the grinding process of the entire cycloid wheel workpiece is completed.

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