Adjustable mounting base for involute cam of precision grinding machine and adjusting method thereof

Abstract

The present application belongs to the technical field of precision machining, and relates to an adjustable mounting seat for a involute cam of a precision gear grinding machine and an adjusting method thereof. The mounting seat comprises a cam mounting seat (2) for mounting the involute cam (1), and a cam adjusting plate (3) is arranged between the cam mounting seat and the bottom surface of the involute cam (1) to adjust the position of the involute cam (1). The tooth profile deviation of the involute cam (1) is reduced by adjusting the mounting position of the involute cam (1) relative to the cam mounting seat (2) and the cam adjusting plate (3). The present application can accurately control the position accuracy of the involute cam (1) relative to the axis of the reference shaft sleeve (7). The present application greatly improves the tooth profile accuracy of the involute cam of the precision gear grinding machine, has high working efficiency, is easy to adjust, and is convenient to disassemble and assemble.

Description

Technical Field

[0001] This invention belongs to the field of precision machining technology, and relates to an adjustable mounting base for an involute cam used in a precision gear grinding machine and its adjustment method. Background Technology

[0002] Gears are critical and fundamental components used in a wide range of industries, almost every sector of the national economy. Currently, the gear industry is the largest sector among China's basic mechanical components. With the rapid development of the national economy, the demand for gear precision is increasing. High-precision gears, including precision gears and ultra-precision gears, are widely used in industry and defense, specifically in instruments, automatic control devices, and high-speed equipment.

[0003] The machining processes for involute gears can be categorized based on the gear forming method into forming and generating methods; and based on the machining method into hobbing, milling, shaping, combing, planing, shaving, honing, grinding, and extrusion. Among these common gear machining methods, grinding is the most effective method for precision gears in terms of working accuracy and surface quality. Grinding methods can be further classified according to the type of grinding wheel used, including conical grinding wheel grinding, butterfly grinding wheel grinding, large flat grinding wheel grinding, worm grinding wheel grinding, and form grinding wheel grinding.

[0004] Large-surface grinding wheels offer high precision and are commonly used for grinding high-precision standard gears, gear shapers, and gear shaving cutters. Their working principle utilizes the meshing principle of racks and gears, using the working surface of the large-surface grinding wheel as one tooth surface of an "imaginary rack" to machine the gear using a generating method. The generation motion can be categorized into three types: one uses a steel belt and a rolling disc to generate the generating motion through pure rolling, such as the SRS405 CNC large-surface grinding wheel gear shaving cutter grinding machine developed by Gleason Group and the domestic Y7432 gear grinding machine; another uses an involute cam and a stop to generate the generating motion, such as the American NationaI Tool type and the domestic Y7125 and Y7431 gear grinding machines; and a third uses an electronic generating method to generate the involute curve. This type of equipment decomposes pure rolling into two proportional rotational and translational motions, which are driven and controlled by rotary stepper motors and linear stepper motors and grating systems, respectively.

[0005] Because the steel strip is a flexible material, the stiffness of this type of generating system is low, and the thickness accuracy of the steel strip is difficult to guarantee. Therefore, the generating accuracy of the roller-steel strip involute generating system is difficult to improve further. Due to the numerous error sources in electronic generating systems and the inherent weaknesses of electrical signals (drift, hysteresis, susceptibility to interference), the accuracy of involutes machined using electronic generating methods is relatively low. Generally, the accuracy of gear involutes machined using electronic generating methods is grade 3 to 2 in ISO 1328-1:2013. Based on current machining and CNC technology levels, electronic generating methods are insufficient for machining high-grade involute templates. The generating accuracy of this type of generating system mainly comes from the surface shape accuracy and installation accuracy of the template—the involute cam. The generating system has a simple structure, high stiffness, and fewer error sources. Although the involute curve produced by an involute cam-baffle gear grinding machine is a secondary forming process, high-precision involute cams can be produced using a one-step forming device such as a roller-guide generating mechanism. Compared to the roller-belt generating system, the involute cam-baffle generating system lacks a flexible body, resulting in higher structural rigidity and higher machining accuracy of the involute curve. This method is widely used for involute forming of domestic standard gears and high-precision gear shapers and shaving cutters.

[0006] Cam-baffle type gear grinding machines process shaped gears by using a grinding wheel dresser to dress the grinding wheel and then performing the grinding process using the generating method. First, a template for the grinding wheel is designed and machined according to the shaping curve. Then, the grinding wheel is dressed using the template. Finally, the shaped gear is ground using the generating method with the template. However, this template method introduces an error when machining the cutting tool using the template, and another error occurs when the cutting tool is machining the gear. The cumulative effect of these two errors significantly impacts machining accuracy. Therefore, to ensure high gear precision, the high precision of the involute cam used as the machining reference for the involute curve of the gear is crucial. The same Y7125 gear grinding machine is equipped with two identical involute cam holders. One is installed on the Y7125 gear grinding machine as the mounting reference for the involute cam, and the other is placed with the machine tool manufacturer for custom machining of the involute cam for that machine tool. The involute cam seats of different Y7125 gear grinding machines are not interchangeable. Currently, there are about two thousand Y7125 gear grinding machines on the market. Since the Y7125 has been discontinued, the involute cams are stored in the factory's warehouse. The factory no longer provides customized processing of involute cams, which makes it impossible to refine and purchase involute cams for Y7125 gear grinding machines on the market. Summary of the Invention

[0007] This invention addresses the problems of existing involute cam mounting seats for precision gear grinding machines, such as complex structure, low precision, multiple clamping of tooling, low work efficiency, difficulty in adjustment and disassembly, complex installation and adjustment of involute cams for precision gear grinding machines, and tooling incompatibility with different models of large-plane grinding wheel gear grinding machines. It provides an adjustable mounting seat for involute cams for precision gear grinding machines and its installation method. The invention is characterized by: a cam mounting seat for mounting the involute cam, and a cam adjustment plate for adjusting the position of the involute cam is provided between the cam mounting seat and the bottom surface of the involute cam.

[0008] A cam counterweight plate is provided on the mounting surface of the counterweight plate on the cam mounting base; an involute cam for counterweight is provided at the lower part of the cam counterweight plate;

[0009] The center of each end face of the cam mounting seat is provided with a bushing fitting hole. Two reference bushings are symmetrically fitted at both ends of the bushing fitting hole, and two counterweight adjustment rings are respectively provided in the two reference bushings.

[0010] The adjustable mounting base for the involute cam used in a fine gear grinding machine, as described above, is characterized in that: a V-groove is provided in the middle of the top surface of the cam adjusting plate, a trapezoidal groove is provided in the middle of the bottom surface of the involute cam, and a cam shaft is provided between the trapezoidal groove and the V-groove. The diameter of the cam shaft is greater than the sum of the heights of the trapezoidal groove and the V-groove; thus, there is a gap between the bottom surface of the involute cam and the top surface of the cam adjusting plate, allowing the involute cam to rotate around the axis of the cam shaft.

[0011] The adjustable mounting base for the involute cam of the fine gear grinding machine described above is characterized in that: the two cam mounting bases are respectively provided with positioning plate connecting threaded holes on their sides near the mounting surface of the cam adjusting plate; the set screw passes through the positioning plate connecting threaded holes, and a left positioning plate and a right positioning plate are adjustablely connected to adjust the relative position of the cam adjusting plate and the cam mounting base in the horizontal direction.

[0012] The adjustable mounting base for the involute cam of the precision gear grinding machine described above is characterized by:

[0013] The cam mount has a counterweight connection threaded hole at the middle of its side for connecting counterweight parts. The counterweight parts are used to adjust the center of gravity of the entire adjustable mount to be at the center of the shaft fitting hole.

[0014] The counterweight consists of an involute cam, a cam mount, and a cam counterweight plate, all connected by screws.

[0015] The left and right positioning plates are mounted on the cam mounting base 2 via positioning plate connecting screws.

[0016] The adjustable mounting base for the involute cam used in a precision gear grinding machine, as described above, is characterized in that: the cam mounting base is a symmetrical structural part; the bushing fitting hole at the center of the cam mounting base is interference-fitted with the reference bushing; the mounting surface of the cam adjusting plate is provided with evenly distributed connecting threaded holes, and the cam adjusting plate and the involute cam are connected by bolts through the connecting threaded holes; the bottom surface of the cam mounting base is a counterweight plate mounting surface, which is also provided with evenly distributed connecting threaded holes, and the cam counterweight plate and the involute cam for counterweight are connected by bolts through the connecting threaded holes; the side of the cam mounting base near the mounting surface of the cam adjusting plate is provided with a positioning plate connecting threaded hole to connect the left positioning plate and the right positioning plate; the middle position of the side of the cam mounting base is provided with a counterweight connecting threaded hole for connecting the counterweight parts, adjusting the center of mass of the entire adjustable mounting base to be at the center position of the bushing fitting hole axis.

[0017] The adjustable mounting base for the involute cam used in a fine gear grinding machine, as described above, is characterized in that: the cam adjustment plate is a symmetrical plate-shaped part used to adjust the horizontal position of the involute cam; the cross-section of the cam adjustment plate is trapezoidal; the cam shaft is a standard cylinder, set on a V-groove, the intersection line of the two inclined surfaces of the V-groove is parallel to the cam shaft, and the two form a sliding rotation shaft system through line contact; the cam adjustment plate serves as a transition part, and to match the connecting threaded holes in the mounting surface of the cam adjustment plate, the top surface of the cam adjustment plate has an equal number of positioning through holes at corresponding positions, the diameter of the positioning through holes being larger than the diameter of the connecting threaded holes, so as to leave adjustment space for the cam adjustment plate in the horizontal direction; the cam shaft axis is parallel to the cam adjustment plate support surface, the involute cam matches the cam shaft, the cam adjustment plate support surface matches the cam mounting base, and screws connect the involute cam, the cam mounting base, and the cam adjustment plate.

[0018] The adjustable mounting base for the involute cam used in a fine grinding machine, as described above, is characterized in that: the left positioning plate and the right positioning plate are a set of two symmetrical L-shaped parts; the support surfaces of the left and right positioning plates serve as guide surfaces for fine-tuning the cam adjustment plate, assisting in controlling the relative position of the cam adjustment plate and the cam mounting base in the axial direction of the cam shaft; to accommodate the threaded holes of the positioning plates, several left and right positioning plate through holes are symmetrically arranged at corresponding positions on the connecting surfaces of the left and right positioning plates; the positioning plate connecting screws pass through the left and right positioning plate through holes respectively, connecting the left and right positioning plates to the sides of the two cam mounting bases respectively; symmetrical left and right positioning plate locking holes are arranged near the upper ends of the left and right positioning plate through holes; the set screws pass through the left and right positioning plate locking holes to position the cam adjustment plate and adjust and correct its horizontal position.

[0019] The adjustable mounting base for the involute cam of the fine grinding machine described above is characterized in that: the reference bushing is a set of two stepped ring parts, the inner ring surface can be fitted with the reference shaft through the ball bearing bushing to form the rotary shaft system of the adjustable mounting base, and the diameter of the large ring surface of the reference bushing is larger than the diameter of the small ring surface, forming a boss positioning structure.

[0020] The adjustable mounting base for the involute cam used in a fine grinding machine, as described above, is characterized in that: a guide ring is provided near the end face of the small annular surface of the reference bushing, the outer diameter of the guide ring is smaller than the outer diameter of the small annular surface, the entire small annular surface is interference-fitted into the bushing fitting hole, the large annular end faces of the two reference bushings are parallel to each other and coaxial with the inner annular surface; the counterweight adjustment ring is a set of two circular ring parts, the outer annular surface of the adjustment ring is provided with a trapezoidal groove, the bottom of the groove is provided with a locking hole, the adjustment ring is assembled onto the large annular surface of the two reference bushings by inserting a set screw into the locking hole, the end face of the adjustment ring is in close contact with the end face of the cam mounting base, the counterweight can be inserted from the groove hole, and the position of the center of mass of the adjustable mounting base is finely adjusted by adjusting the position of the counterweight in the counterweight adjustment ring.

[0021] The adjustment method for the adjustable mounting base of the involute cam for a precision gear grinding machine, as described above, is characterized by including the following steps:

[0022] Step 1: Measure the involute cam and calculate the positional deviation of the involute cam base circle center relative to the reference bushing center;

[0023] Step 2: Adjust the mounting position of the involute cam relative to the cam mount and cam adjusting plate to reduce the profile deviation of the involute cam.

[0024] Step 3: Check the positional deviation of the involute cam base circle center relative to the reference bushing center after adjustment. Repeat Step 2 until the involute cam base circle center coincides with the reference bushing center.

[0025] In step two: Establish a Cartesian coordinate system with the reference bushing axis as the origin, the straight line parallel to the cam adjustment plate mounting surface of the cam mount as the X-axis, and the straight line perpendicular to the cam adjustment plate mounting surface of the cam mount as the Y-axis. Measure the positions of the involute starting point, the highest point of the cam, and the involute ending point on the involute cam. Calculate the position of the center of the involute base circle of the involute cam, thereby calculating the positional deviation between the involute cam and the reference bushing axis.

[0026] Based on the position of the involute base circle center on the involute cam calculated in step one, adjust the involute cam so that the involute base circle center coincides with the reference bushing center. The position adjustment of the involute cam includes translation adjustment and rotation adjustment.

[0027] The translation adjustment refers to translating the initial involute cam along phase β by a distance e. The translation distance e includes three displacement modes: the initial involute cam moving upward and downward along the Y-axis along phase β, and the initial involute cam moving horizontally along the X-axis along phase β.

[0028] When the center of the involute base circle of the involute cam is lower than the center of the reference bushing, a shim is added at the horizontal plane of the counterweight plate mounting surface of the cam mounting seat to make the involute cam move upward along the Y axis. The translation distance e is determined by the thickness T1 of the shim, and the relationship is: e = T1, β = 90°.

[0029] When the center of the involute base circle of the involute cam is higher than the center of the reference bushing, the involute cam moves downward along the Y-axis by grinding the mounting surface of the cam adjustment plate of the cam mounting seat. The translation distance e is determined by the grinding depth T2, and the relationship is: e = T2, β = -90°.

[0030] When there is a horizontal offset between the center of the involute base circle of the involute cam and the center of the reference bushing, the position of the cam adjustment plate moves along the X-axis due to the movement of the screw in the positioning through hole of the cam adjustment plate, so that the involute cam moves in the horizontal direction. The cam adjustment plate is fixed by adjusting the set screws on the left and right positioning plates. The translation distance e is determined by the displacement T3 of the cam adjustment plate. The relationship is: e=T3, β=0° or β≈180°.

[0031] The rotation adjustment is the rotation of the initial involute of the involute cam around the cam axis p(x,y) by an angle θ. It can be decomposed into the rotation adjustment of the involute cam's involute around the center of the involute base circle and the translation adjustment of the involute cam's involute along the phase β by a distance e. The curve of the involute cam's involute after rotating around the center of the involute base circle is still a standard involute, only the initial development angle lags by θ, which does not affect the position change of the center of the involute base circle.

[0032] By calculating the axis of rotation p(x, y) of the cam shaft and using the cosine theorem, the equivalent translation distance e and its phase β can be obtained, e = (2 × (x, y) / 2) = ... 2 +y 2 )×(1-cos((θ))) 1 / 2 , β=π-arctan(y / x)-(π-|θ|) / 2;

[0033] In step three: by measuring the positions of the starting point, the highest point, and the ending point of the involute on the adjusted involute cam, the position of the center of the involute base circle is obtained. This verifies whether the adjustment of the involute cam meets the accuracy requirements. If not, step two is repeated to continue adjusting the installation position of the involute cam until the center of the involute base circle of the involute cam coincides with the center of the reference bushing.

[0034] Advantages of this invention compared to existing technologies:

[0035] 1. An adjustable mounting base for an involute cam used in a fine grinding machine has been invented. It uses only a high-precision cam adjustment plate with a V-groove and a cam shaft to form a rotary shaft system, which can accurately control the positional accuracy of the involute cam relative to the axis of the reference bushing.

[0036] 2. For the same model of large flat grinding wheel gear grinding machine, only one adjustment of the involute cam is needed using the adjustable mounting base, which can be applied to all involute cams. It has the advantages of high precision, fast working efficiency, easy adjustment, and convenient disassembly and assembly.

[0037] 3. The adjustable mounting base provided by this invention allows for precise adjustment of the center of mass of the adjustable mounting base to the reference shaft center by changing the position of each counterweight block within the counterweight adjustment ring. This design is convenient to operate and easy to repair. It can meet the precision machining requirements of involute cams and is suitable for various models of large-plane grinding wheel gear grinding machines, possessing good market application prospects and promotional value.

[0038] 4. The adjustment method for the adjustable mounting base of the involute cam used in a precision gear grinding machine employs a high-precision cam adjustment plate with grooves and a cam shaft. Through translational and rotational adjustments, the positional accuracy of the involute profile on the involute cam can be precisely controlled. This adjustment method is highly efficient and can significantly improve the grinding accuracy of the involute cam tooth profile in a precision gear grinding machine. Attached Figure Description

[0039] Figure 1 A schematic diagram of the adjustable mounting base for an involute cam used in a fine gear grinding machine.

[0040] Figure 2 A schematic diagram of the cam mounting base.

[0041] Figure 3 A schematic diagram of the cam adjustment plate.

[0042] Figure 4 A schematic diagram of the left positioning plate.

[0043] Figure 5 A schematic diagram of the right positioning plate.

[0044] Figure 6 A schematic diagram of the reference bushing.

[0045] Figure 7 A schematic diagram of the counterweight adjustment ring.

[0046] Figure 8 Flowchart of the adjustment method for the adjustable mounting base of the involute cam used in a fine gear grinding machine.

[0047] Figure 9 Involute cam.

[0048] In the diagram: 1: Involute cam; 1-1 Involute starting point; 1-2 Cam highest point; 1-3 Involute ending point; 2: Cam mounting seat; 2-1: Cam mounting seat end face; 2-2: Cam adjusting plate mounting surface; 2-3: Cam mounting seat side; 2-4: Shaft fitting hole; 2-5: Counterweight plate mounting surface; 2-6: Connecting threaded hole; 2-7: Positioning plate connecting threaded hole; 2-8: Counterweight connecting threaded hole; 3: Cam adjusting plate; 3-1: Cam adjusting plate cross-section; 3-2: Cam adjusting plate top surface; 3-3: Cam adjusting plate inclined surface; 3-4: Cam adjusting plate support surface; 3-5: V-groove; 3-6: Positioning through hole; 4: Left positioning plate; 4-1: Left positioning plate connecting surface; 4-2: Left positioning plate support surface; 4 -3: Left positioning plate through hole; 4-4: Left positioning plate locking hole; 5: Right positioning plate; 5-1: Right positioning plate connecting surface; 5-2: Right positioning plate support surface; 5-3: Right positioning plate through hole; 5-4: Right positioning plate locking hole; 6: Cam shaft; 7: Reference bushing; 7-1: Large ring surface; 7-2: Small ring surface; 7-3: Guide ring; 7-4: Inner ring surface; 7-5: Large ring end face; 7-6: Small ring end face; 8: Counterweight adjusting ring; 8-1: Adjusting ring outer ring surface; 8-2: Adjusting ring inner ring surface; 8-3: Adjusting ring end face; 8-4: Ring groove; 8-5: Slot hole; 8-6: Locking hole; 9: Screw; 10: Positioning plate connecting screw; 11: Set screw; 12: Cam counterweight plate; 13: Involute cam for counterweight. Detailed Implementation

[0049] Preferred Implementation Method 1

[0050] The adjustable mounting base for the involute cam of the fine gear grinding machine includes a cam mounting base 2 for mounting the involute cam 1, and a cam adjusting plate 3 for adjusting the position of the involute cam 1 is provided between the cam mounting base and the bottom surface of the involute cam 1.

[0051] A cam counterweight plate 12 is provided on the counterweight plate mounting surface 2-5 of the cam mounting base 2; an involute cam 13 for counterweight is provided at the lower part of the cam counterweight plate 12.

[0052] The center of each end face 2-1 of the cam mounting seat is provided with a bushing fitting hole 2-4. Two reference bushings 7 are symmetrically fitted at both ends of the bushing fitting hole 2-4. Two counterweight adjustment rings 8 are respectively provided in the two reference bushings 7.

[0053] The top surface 3-2 of the cam adjustment plate has a V-shaped groove 3-5 in the middle, and the bottom surface of the involute cam 1 has a trapezoidal groove in the middle. A cam shaft 6 is provided between the trapezoidal groove and the V-shaped groove 3-5. The diameter of the cam shaft 6 is greater than the sum of the height of the trapezoidal groove and the height of the V-shaped groove 3-5. This creates a gap between the bottom surface of the involute cam 1 and the top surface 3-2 of the cam adjustment plate, allowing the involute cam 1 to rotate around the axis of the cam shaft 6.

[0054] The two cam mounting seats have positioning plate connecting threaded holes 2-7 on their sides 2-3 near the cam adjustment plate mounting surface 2-2. The set screw 11 passes through the positioning plate connecting threaded holes 2-7 and is adjustablely connected to the left positioning plate 4 and the right positioning plate 5 for adjusting the relative horizontal position of the cam adjustment plate 3 and the cam mounting seat 2.

[0055] The cam mounting base has a counterweight connecting threaded hole 2-8 at the middle position of the side 2-3, which is used to connect the counterweight parts. The counterweight parts are used to adjust the center of gravity of the entire adjustable mounting base to be at the center position of the shaft fitting hole 2-4.

[0056] The counterweight consists of an involute cam 13, a cam mounting base 2, and a cam counterweight plate 12, all of which are connected by screws 9.

[0057] The left positioning plate 4 and the right positioning plate 5 are mounted on the cam mounting seat 2 by positioning plate connecting screws 10.

[0058] The cam mounting base 2 is a symmetrical structural part. The bushing fitting hole 2-4 at the center of the cam mounting base 2 is interference-fitted with the reference bushing 7. The cam adjusting plate mounting surface 2-2 is provided with evenly distributed connecting threaded holes 2-6. The cam adjusting plate 3 and the involute cam 1 are bolted together through the connecting threaded holes 2-6. The bottom surface of the cam mounting base 2 is the counterweight plate mounting surface 2-5, which is also provided with evenly distributed connecting threaded holes 2-6. The cam counterweight plate 1 and the counterweight involute cam 13 are bolted together through the connecting threaded holes 2-6. The side surface 2-3 of the cam mounting base is provided with a positioning plate connecting threaded hole 2-7 near the cam adjusting plate mounting surface 2-2 to connect the left positioning plate 4 and the right positioning plate 5. The side surface 2-3 of the cam mounting base is provided with a counterweight connecting threaded hole 2-8 in the middle position to connect the counterweight parts and adjust the center of gravity of the entire adjustable mounting base to be at the axis of the bushing fitting hole 2-4.

[0059] The cam adjusting plate 3 is a symmetrical plate-shaped part used to adjust the horizontal position of the involute cam 1. The cross-section 3-1 of the cam adjusting plate is trapezoidal. The cam shaft 6 is a standard cylinder, set on the V-groove 3-5. The intersection line of the two inclined surfaces of the V-groove 3-5 is parallel to the cam shaft 6, and the two form a sliding rotation axis system through line contact. The cam adjusting plate 3 serves as a transition part. To match the connecting threaded hole 2-6 in the mounting surface 2-2 of the cam adjusting plate, an equal number of positioning through holes 3-6 are opened at the corresponding positions on the top surface 3-2 of the cam adjusting plate. The diameter of the positioning through holes 3-6 is larger than the diameter of the connecting threaded hole 2-6 to leave room for adjustment in the horizontal direction of the cam adjusting plate 3. The axis of the cam shaft 6 is parallel to the support surface 3-4 of the cam adjusting plate. The involute cam 1 matches the cam shaft 6. The support surface 3-4 of the cam adjusting plate matches the cam mounting seat 2. The screw 9 connects the involute cam 1, the cam mounting seat 2, and the cam adjusting plate 3.

[0060] The left positioning plate 4 and right positioning plate 5 are a set of two symmetrical L-shaped parts. The support surface 4-2 of the left positioning plate and the support surface 5-2 of the right positioning plate serve as guide surfaces for the fine adjustment of the cam adjusting plate 3, assisting in controlling the relative position of the cam adjusting plate 3 and the cam mounting seat 2 in the axial direction of the cam shaft 6. To accommodate the threaded holes 2-7 of the positioning plates, several through holes 4-3 of the left positioning plate and 5-3 of the right positioning plate are symmetrically arranged at corresponding positions on the connecting surfaces 4-1 and 5-1 of the left and right positioning plates. Connecting screws 10 pass through the left positioning plate through hole 4-3 and the right positioning plate through hole 5-3 respectively, connecting the left positioning plate 4 and the right positioning plate 5 to the two cam mounting seats on the sides 2-3 respectively; symmetrical locking holes 4-4 and 5-4 are provided near the upper ends of the left positioning plate through hole 4-3 and the right positioning plate through hole 5-3. Set screws 11 pass through the left positioning plate locking holes 4-4 and the right positioning plate locking holes 5-4 to position the cam adjusting plate 3 and adjust and correct the horizontal position of the cam adjusting plate 3.

[0061] The reference bushing 7 is a set of two stepped ring parts. The inner ring surface 7-4 can be fitted with the reference shaft through the ball bearing bushing to form a rotary shaft system of the adjustable mounting base. The diameter of the large ring surface 7-1 of the reference bushing 7 is larger than the diameter of the small ring surface 7-2, forming a boss positioning structure.

[0062] A guide ring 7-3 is provided near the end face of the small annular surface 7-2 of the reference bushing 7. The outer diameter of the guide ring 7-3 is smaller than that of the small annular surface 7-2. The entire small annular surface 7-2 is interference-fitted into the bushing fitting hole 2-4. The large annular end faces 7-5 of the two reference bushings 7 are parallel to each other and coaxial with the inner annular surface 7-4. The counterweight adjusting ring 8 is a set of two circular ring parts. The outer annular surface 8-1 of the adjusting ring is provided with a trapezoidal groove 8-4. The bottom of the groove 8-4 is provided with a locking hole 8-6. The adjusting ring 8 is assembled onto the large annular surface 7-1 of the two reference bushings 7 by inserting a set screw into the locking hole 8-6. The end face 8-3 of the adjusting ring is in close contact with the end face 2-1 of the cam mounting seat. The counterweight can be inserted from the groove 8-5. By adjusting the position of the counterweight in the counterweight adjusting ring 8, the center of gravity position of the adjustable mounting seat can be finely adjusted.

[0063] The adjustment method for the adjustable mounting base of the involute cam used in the refining gear grinding machine is characterized by comprising the following steps:

[0064] Step 1: Measure the involute cam 1 and calculate the positional deviation of the involute base circle center of the involute cam 1 relative to the axis center of the reference bushing 7.

[0065] Step 2: Adjust the mounting position of the involute cam 1 relative to the cam mount 2 and the cam adjusting plate 3 to reduce the tooth profile deviation of the involute cam 1;

[0066] Step 3: Check the positional deviation of the involute base circle center of the adjusted involute cam 1 relative to the axis center of the reference bushing 7. Repeat step 2 until the involute base circle center of the involute cam 1 coincides with the axis center of the reference bushing 7.

[0067] In step two: Establish a Cartesian coordinate system with the axis of the reference bushing 7 as the origin, the straight line parallel to the mounting surface 2-2 of the cam adjustment plate of the cam mounting seat 2 as the X-axis, and the straight line perpendicular to the mounting surface 2-2 of the cam adjustment plate of the cam mounting seat 2 as the Y-axis. Measure the positions of the starting point, the highest point, and the ending point of the involute on the involute cam 1, calculate the position of the center of the base circle of the involute on the involute cam 1, and thus calculate the positional deviation between the axis of the involute cam 1 and the axis of the reference bushing 1.

[0068] Based on the position of the involute base circle center on the involute cam 1 calculated in step one, adjust the involute cam 1 so that the involute base circle center coincides with the axis center of the reference sleeve 7. The position adjustment of the involute cam 1 includes translation adjustment and rotation adjustment.

[0069] The translation adjustment refers to translating the initial involute of the involute cam 1 by a distance e along phase β. The translation distance e includes three displacement modes: the initial involute of the involute cam 1 moving upward and downward along the Y-axis along phase β, and the initial involute of the involute cam 1 moving horizontally along the X-axis along phase β.

[0070] When the center of the involute base circle of the involute cam 1 is lower than the center of the reference bushing, a shim is added at the horizontal plane of the counterweight plate mounting surface 2-5 of the cam mounting seat 2, so that the involute cam 1 moves upward along the Y axis. The translation distance e is determined by the thickness T1 of the shim, and the relationship is: e = T1, β = 90°.

[0071] When the center of the involute base circle of the involute cam 1 is higher than the center of the reference bushing, the involute cam 1 moves downward along the Y-axis through the grinding cam mounting seat 2 cam adjustment plate mounting surface 2-2. The translation distance e is determined by the grinding depth T2, and the relationship is: e=T2,β=-90°;

[0072] When there is a horizontal offset between the center of the involute base circle of the involute cam 1 and the center of the reference sleeve 7, the screw 9 moves within the positioning through hole 3-6 of the cam adjustment plate 3, moving the position of the cam adjustment plate 3 along the X-axis, causing the involute cam 1 to move horizontally. The set screws 11 on the left positioning plate 4 and the right positioning plate 5 are adjusted to fix the cam adjustment plate 3. The translation distance e is determined by the displacement T3 of the cam adjustment plate 3, and the relationship is: e=T3, β=0° or β≈180°;

[0073] The rotation adjustment is the rotation of the initial involute of the involute cam 1 around the axis p(x,y) of the cam 1 rotation center by an angle θ. It can be decomposed into the rotation adjustment of the involute of the involute cam 1 around the center of the involute base circle and the translation adjustment of the involute of the involute cam 1 along the phase β by a distance e. The curve of the involute cam 1 after rotating around the center of the involute base circle is still a standard involute, only the initial development angle lags by θ, which does not affect the position change of the center of the involute base circle.

[0074] By calculating the axis of rotation p(x, y) of the cam shaft and using the cosine theorem, the equivalent translation distance e and its phase β can be obtained, e = (2 × (x, y) / 2) = ... 2 +y 2 )×(1-cos((θ))) 1 / 2 , β=π-arctan(y / x)-(π-|θ|) / 2;

[0075] In step three: by measuring the positions of the starting point, the highest point, and the ending point of the involute on the adjusted involute cam 1, the position of the center of the involute base circle is obtained. This verifies whether the adjustment of the involute cam 1 meets the accuracy requirements. If not, step two is repeated to continue adjusting the installation position of the involute cam 2 until the coincidence accuracy between the center of the involute base circle of the involute cam 1 and the center of the reference bushing 7 meets the requirements.

[0076] Preferred Implementation Method 2

[0077] Taking the Y7125 large surface gear grinding machine as an example, the structure of the adjustable mounting base of the involute cam for the fine gear grinding machine in this embodiment of the invention is described.

[0078] The structure of the adjustable mounting base main body, cam mounting base 2 and cam adjusting plate 3:

[0079] The Y7125 large surface gear grinding machine is equipped with an involute cam holder. The center of its mounting hole is 58mm away from the bottom surface of the involute cam 1. Therefore, the height of the cam adjustment plate 3 is 18mm, and the height of the cam mounting seat 2 is 80mm.

[0080] The cam mounting base 2 is made of 45# steel. Based on the lower surface dimensions of the involute cam 1 (120mm × 100mm) and the position of the countersunk hole, the dimensions of the cam adjusting plate mounting surface 2-2 and the counterweight plate mounting surface 2-5 are also 120mm × 100mm. Four evenly distributed M12 connecting threaded holes 2-6 mate with the countersunk hole of the involute cam. The cam adjusting plate mounting surface 2-2 supports the cam adjusting plate 3 upwards. High flatness is required, which can be improved to the micron level through precision grinding. The counterweight... The mounting surface 2-5 of the plate supports the cam counterweight plate 12 downwards; a bushing fitting hole 2-4 with a diameter of 68mm is opened from the center of the end face 2-1 of the cam mounting seat, and the bushing fitting hole 2-4 is heat-fitted with the reference bushing 7; two positioning plate connecting threaded holes 2-7 of model M5 are provided on the side 2-3 of the cam mounting seat near the mounting surface 2-2 of the cam adjusting plate to connect the left positioning plate 4 and the right positioning plate 5; an M8 counterweight connecting threaded hole 2-8 is provided in the middle of the side 2-3 of the cam mounting seat for connecting the counterweight parts.

[0081] The cam adjusting plate 3 is made of 42CrMo material and has undergone hardening treatment. The dimensions of its supporting surface 3-4 are the same as the dimensions of its mating surface 2-2, both being 120mm × 100mm. The top surface 3-2 of the cam adjusting plate has dimensions of 108mm × 100mm and an 80° bevel angle. The cross-section 3-1 of the cam adjusting plate is an isosceles trapezoidal structure. The force applied by the set screw 11 to the inclined surface 3-3 of the cam adjusting plate consists of a perpendicular force and a parallel force relative to the top surface 3-2, which can secure the cam adjusting plate 3 and finely adjust its horizontal orientation. A V-groove 3-5 is designed at the center of the top surface 3-2 of the cam adjusting plate. As a transition piece, the cam adjusting plate 3 has four evenly distributed 13mm diameter positioning through holes 3-6 from the top surface 3-2 of the cam adjusting plate to the supporting surface 3-4 of the cam adjusting plate. The top surface 3-2 and the supporting surface 3-4 of the cam adjusting plate respectively cooperate with the involute cam 1 and the cam mounting seat 2. The screw 9 of model M12 starts from the countersunk hole of the involute cam 1, passes through the positioning through holes 3-6 on the cam adjusting plate 3, and connects to the connecting threaded hole 2-6 on the cam mounting seat 2.

[0082] The left positioning plate 4 and right positioning plate 5 are made of 45 steel with a thickness of 8mm. They mate with the side surface 2-3 of the cam mounting seat. The connecting surface 4-1 of the left positioning plate and the connecting surface 5-1 of the right positioning plate are 100mm × 26mm in size. Two symmetrically designed 6mm diameter through holes 4-3 and 5-3 are provided on them. The left positioning plate 4 and right positioning plate 5 are fixed to the cam mounting seat 2 by M5 positioning plate connecting screws 10. Near the upper end of the left positioning plate through holes 4-3 and 5-3, there are symmetrically designed M5 locking holes 4-4 and 5-4. Set screws 11 pass through the locking holes 4-4 and 5-4 to position the cam adjusting plate 3 and correct its horizontal orientation. The left positioning plate support surface 4-2 and the right positioning plate support surface 5-2 are 12mm×26mm fine-tuning guide surfaces to ensure that the fit between the cam adjustment plate support surface 3-4 and the cam adjustment plate mounting surface 2-2 does not deviate.

[0083] The cam shaft 6 is made of bearing steel and hardened to a hardness of not less than HRC60. It has a diameter of 19.400 mm and is precisely arranged on the V-groove 3-5. The axis of the cam shaft 6 is parallel to the groove surface of the V-groove 3-5 and the support surface 3-4 of the cam adjustment plate. The parallelism between the top surface of the involute cam 1 and the axis of the cam shaft 6, and the parallelism between the top surface 3-2 of the cam adjustment plate and the axis of the cam shaft 6, is 2 μm. The two are not in contact and are spaced 0.2 mm apart. The cam shaft 6 can precisely adjust the angle between the involute cam 1 and the cam adjustment plate 3. With the axis of the cam shaft 6 as the rotation axis, the involute cam 1 rotates around the axis of the cam shaft 6 at a small angle.

[0084] The reference bushing 7 is made of GCr15 material and is hardened to a hardness of not less than HRC60. The small annular surface 7-2 has a diameter of 68mm and a length of 30mm. A 5mm guide ring 7-3 is cut near the end face of the small annular surface 7-2. The outer diameter of the guide ring 7-3 is 0.04mm smaller than the diameter of the small annular surface 7-2, so that the entire small annular surface 7-2 can be heat-fitted into the bushing fitting hole 2-4 of the involute cam mounting seat. The large annular surface 7-1 has a diameter 2mm larger than the diameter of the small annular surface 7-2 and a length of 20mm, forming a boss positioning structure. The inner annular surface 7-4 has a diameter of 50mm and is fitted with a reference shaft with a diameter of 40mm through a ball bearing bushing. The coaxiality of the two reference bushings 7 is required to be high, which can be adjusted by precision grinding of the inner annular surface 7-4.

[0085] The counterweight adjusting ring 8 is made of 45# steel, with an outer diameter of 106mm and an inner diameter of 70mm. The inner ring surface 8-2 of the adjusting ring is symmetrically assembled on the large ring surface 7-1 of the two reference bushings 7, and is tightly attached to the end face 2-1 of the cam mounting seat. The outer ring surface 8-1 of the adjusting ring has a groove 8-4, which has a trapezoidal cross-section with an upper base of 14mm, a lower base of 19mm, and a height of 12mm. The counterweight can be inserted through the 19mm diameter slot 8-5 and moves in a circular motion within the groove 8-4, making it difficult to fall out. By adjusting the position of the counterweight inside the adjusting ring 8, the center of gravity position of the adjustable mounting seat can be controlled.

[0086] Method for adjusting the counterweight of an adjustable cam seat:

[0087] Taking an involute cam 1 with a base circle diameter of 106mm as an example, this describes the method for adjusting the counterweight of the adjustable cam seat.

[0088] Pre-processing: The involute cam 1 with a base circle diameter of 106mm has a mass of 3.5437kg. A counterweight involute cam 13 with a base circle diameter of 100.5mm and a mass of 3.4754kg is selected. The screw passes through the countersunk hole of the counterweight involute cam 13, through the involute cam counterweight plate 12, and is connected to the counterweight connecting hole 2-2. The center of mass of the adjustable mounting base is initially balanced to the center of the reference bushing (7).

[0089] For rough adjustment, use screws, nuts and other counterweight parts to connect to the corresponding counterweight connection threaded holes 2-8. After finely planning the position of the counterweight parts, tighten them. This can initially adjust the center of gravity of the adjustable mounting base to be at the center of the reference bushing (7).

[0090] After fine-tuning and analyzing the center of gravity position of the adjustable mounting base after coarse adjustment, four counterweights are placed equally in the two counterweight adjustment rings 8. The counterweights slide from the slot 8-5 into the ring groove 8-4 and make circular motion in the ring groove 8-4. According to the actual situation of the center of gravity offset of the adjustable mounting base, the relative position of the counterweights in the counterweight adjustment ring 8 is adjusted to finely control the position of the center of gravity of the adjustable mounting base to the axis of the reference bushing (7). Then, the screws are screwed into the locking hole 8-6 to fix the counterweights in the counterweight adjustment ring.

[0091] Implementation method of adjusting the adjustable mounting base of the involute cam for a precision gear grinding machine:

[0092] Taking an involute cam 1 with a base circle diameter of 106 mm as an example, this invention describes the implementation method of the adjustable mounting base of the involute cam for a refining gear grinding machine.

[0093] Step 1: Measure the involute cam 1 and calculate the positional deviation of the involute base circle center of the involute cam 1 relative to the axis center of the reference bushing 7.

[0094] After precisely assembling the involute cam 1, cam mounting base 2, cam adjusting plate 3, left positioning plate 4, right positioning plate 5, and cam shaft 6 using screws 8, place them in a coordinate measuring machine. Establish a Cartesian coordinate system with the axis of the reference bushing 7 as the origin, the line parallel to the mounting surface 2-2 of the cam adjusting plate of the cam mounting base as the X-axis, and the line perpendicular to the mounting surface 2-2 of the cam adjusting plate of the cam mounting base as the Y-axis. Measure the positions of the three points on the involute cam 1: the starting point 1-1 of the involute, the highest point 1-2 of the cam, and the ending point 1-3 of the involute, to obtain the coordinates of the center of the involute base circle.

[0095] Step 2: Adjust the mounting position of the involute cam 1 relative to the cam mount 2 and the cam adjusting plate 3 to reduce the tooth profile deviation of the involute cam 1;

[0096] Based on the position of the involute base circle center measured in step one, adjust the involute cam 1 so that the center of the involute base circle coincides with the axis of the reference sleeve 7. There are two ways to adjust the involute cam 1: translation adjustment and rotation adjustment.

[0097] Translation adjustment involves shifting the initial involute along a phase β by a distance e. This can be categorized into three displacement modes: upward and downward movement along the Y-axis, and horizontal movement along the X-axis. The offset between the center of the involute base circle and the center of the reference bushing 7 in the Y-axis direction is detected. If the center of the involute base circle is lower than the center of the reference bushing 7 by a distance T1, equal standard shims of 0.01mm each can be added to both ends of the cam adjustment plate mounting surface 2-1 of the cam mounting seat 2, with a total thickness of T1, to compensate for the downward offset of the involute cam 1 in the Y-axis. If the center of the involute base circle is higher than the center of the reference bushing 7 by T2, the cam adjustment plate mounting surface 2-1 can be precisely ground to a depth of T2 to compensate for the upward offset of the involute cam 1 in the Y-axis.

[0098] Furthermore, the offset in the X-direction between the center of the involute base circle and the axis of the reference bushing 7 is analyzed. The adjustable mounting base is placed in front of the industrial microscope. If there is a negative offset T3 in the X-direction between the center of the involute base circle and the axis of the reference bushing 7, the negative offset of the involute cam 1 in the X-direction can be compensated by tightening the set screw 11 on the left positioning plate 4 while observing the position of the cam adjustment plate 3 in the industrial microscope, moving the cam adjustment plate 3 a distance T3 along the X-axis. Further, the set screw 11 on the right positioning plate 5 is tightened to fix the cam adjustment plate 3. If there is a positive offset T3 in the X-direction between the center of the involute base circle and the axis of the reference bushing 7, the positive offset of the involute cam 1 in the X-direction can be compensated by tightening the set screw 11 on the right positioning plate 5 while observing the position of the cam adjustment plate 3 in the industrial microscope, moving the cam adjustment plate 3 a distance T3 along the X-axis. Further, the set screw 11 on the left positioning plate 4 is tightened to fix the cam adjustment plate 3. Since the diameter of screw 9 is 1mm smaller than the diameter of the through hole of cam adjusting plate 3, the displacement T3 of cam adjusting plate 3 on the X-axis ranges from -0.5mm to 0.5mm.

[0099] When the initial involute curve rotates by an angle θ around the cam shaft axis 6, the displacement e = (2 × (x, y)) is generated. 2 +y 2 )×(1-cos((θ))) 1 / 2 The phase quantity β = π - arctan(y / x) - (π - |θ|) / 2. The center of the involute base circle is located directly below the center of the cam shaft, and the rotation angle θ is small. Therefore, the obtained phase β ≈ 0° or β ≈ 180°. The rotation adjustment mainly affects the displacement of the center of the involute base circle in the X direction. Measure the offset of the center of the involute base circle from the center of the reference sleeve 7 in the X-axis direction. Place the adjustable mounting base in front of the photoelectric autocollimator with the cam adjustment plate mounting surface 2-2 parallel to the cam mounting base. If the center of the involute base circle is offset by e1 to the left of the Y-axis, adjust the tightness of the four screws 9 on the adjustable mounting base to make the involute cam 1 rotate counterclockwise around the cam shaft 6 by θ = 1 - e1. 2 / (2×(x 2 +y 2 If the center of the involute base circle is on the right side of the Y-axis (e2), adjust the tightness of the four screws 9 on the adjustable mounting base to make the involute cam 1 rotate counterclockwise around the cam axis 6 by θ = 1 - e2. 2 / (2×(x 2 +y 2 )).

[0100] Step 3: Check the positional deviation of the involute base circle center of the adjusted involute cam 1 relative to the axis center of the reference bushing 7. Repeat step 2 until the involute base circle center of the involute cam 1 coincides with the axis center of the reference bushing 7.

[0101] After adjusting the installation position of the involute cam 1, place it in a coordinate measuring machine and measure the positions of the three points on the involute cam 1 in sequence: the starting point 1-1 of the involute, the highest point 1-2 of the cam, and the ending point 1-3 of the involute. Analyze whether the coordinates of the center of the involute base circle meet the accuracy requirements. If not, repeat step two to continue adjusting the installation posture of the involute cam 1 until the center of the involute base circle coincides with the center of the reference bushing 7.

Claims

1. An adjustable mounting base for an involute cam used in a fine gear grinding machine, characterized in that: Includes a cam mounting seat (2) for mounting an involute cam (1), and a cam adjustment plate (3) for adjusting the position of the involute cam (1) is provided between the cam mounting seat and the bottom surface of the involute cam (1). A cam counterweight plate (12) is provided on the counterweight plate mounting surface (2-5) of the cam mounting base (2); an involute cam (13) for counterweight is provided at the lower part of the cam counterweight plate (12). Two reference bushings (7) are symmetrically fitted at the two ends of the cam mounting base (2-1) at their centers. Two counterweight adjusting rings (8) are respectively installed in the two reference bushings (7). A V-groove (3-5) is provided in the middle of the top surface (3-2) of the cam adjusting plate. A trapezoidal groove is provided in the middle of the bottom surface of the involute cam (1). A cam shaft (6) is provided between the trapezoidal groove and the V-groove (3-5). The diameter of the cam shaft (6) is greater than the sum of the height of the trapezoidal groove and the height of the V-groove (3-5). This creates a gap between the bottom surface of the involute cam (1) and the top surface (3-2) of the cam adjusting plate. The involute cam (1) can rotate around the axis of the cam shaft (6); the two cam mounting seats have positioning plate connecting threaded holes (2-7) on their sides (2-3) near the cam adjustment plate mounting surface (2-2); the set screw (11) passes through the positioning plate connecting threaded hole (2-7) and is adjustablely connected to the left positioning plate (4) and the right positioning plate (5) for adjusting the relative position of the cam adjustment plate (3) and the cam mounting seat (2) in the horizontal direction.

2. The adjustable mounting base for the involute cam of the gear grinding machine according to claim 1, characterized in that: A counterweight connection threaded hole (2-8) is provided in the middle position of the side (2-3) of the cam mount, which is used to connect the counterweight parts. The counterweight parts are used to adjust the center of gravity of the entire adjustable mount to be in the center position of the shaft fitting hole (2-4). The counterweight consists of an involute cam (13), a cam mounting base (2), and a cam counterweight plate (12), all connected by screws (9). The left positioning plate (4) and the right positioning plate (5) are mounted on the cam mounting seat 2 by positioning plate connecting screws (10).

3. The adjustable mounting base for the involute cam of the gear grinding machine according to claim 2, characterized in that: The cam mounting base (2) is a symmetrical structure part. The bushing fitting hole (2-4) at the center of the cam mounting base (2) is interference-fitted with the reference bushing (7). The mounting surface (2-2) of the cam adjusting plate is provided with evenly distributed connecting threaded holes (2-6). The cam adjusting plate (3) is bolted to the involute cam (1) through the connecting threaded holes (2-6). The bottom surface of the cam mounting base (2) is the counterweight plate mounting surface (2-5), which is also provided with evenly distributed connecting threaded holes (2-6). The cam counterweight plate (1) 2) The involute cam (13) for counterweight is connected to the cam by bolts through the connecting threaded hole (2-6); the side of the cam mounting seat (2-3) near the mounting surface (2-2) of the cam adjustment plate is provided with a positioning plate connecting threaded hole (2-7) to connect the left positioning plate (4) and the right positioning plate (5); the side of the cam mounting seat (2-3) is provided with a counterweight connecting threaded hole (2-8) in the middle position to connect the counterweight parts and adjust the center of gravity of the entire adjustable mounting seat to be at the center position of the shaft fitting hole (2-4).

4. The adjustable mounting base for the involute cam of the refining gear grinding machine according to claim 3, characterized in that: The cam adjusting plate (3) is a symmetrical plate-shaped part used to adjust the horizontal position of the involute cam (1); the cross section (3-1) of the cam adjusting plate is trapezoidal; the cam shaft (6) is a standard cylinder, set on the V-groove (3-5), the intersection line of the two inclined surfaces of the V-groove (3-5) is parallel to the cam shaft (6), and the two are in line contact to form a sliding rotation shaft system; the cam adjusting plate (3) serves as a transition part, and in order to match the threaded hole (2-6) in the mounting surface (2-2) of the cam adjusting plate, the corresponding position of the top surface (3-2) of the cam adjusting plate is... An equal number of positioning through holes (3-6) are opened at the position. The diameter of the positioning through holes (3-6) is larger than the diameter of the connecting threaded holes (2-6) to leave room for the horizontal adjustment of the cam adjustment plate (3). The axis of the cam shaft (6) is parallel to the cam adjustment plate support surface (3-4). The involute cam (1) is engaged with the cam shaft (6). The cam adjustment plate support surface (3-4) is engaged with the cam mounting seat (2). The screw (9) connects the involute cam (1), the cam mounting seat (2), and the cam adjustment plate (3).

5. The adjustable mounting base for the involute cam of a precision gear grinding machine according to claim 1 or 4, characterized in that: The left positioning plate (4) and the right positioning plate (5) are a set of two symmetrical L-shaped parts. The support surface (4-2) of the left positioning plate and the support surface (5-2) of the right positioning plate serve as guide surfaces for the fine adjustment of the cam adjusting plate (3), and assist in controlling the relative position of the cam adjusting plate (3) and the cam mounting seat (2) in the axial direction of the cam shaft (6). In order to match the threaded holes (2-7) of the positioning plate, several through holes (4-3) of the left positioning plate and through holes (5-3) of the right positioning plate are symmetrically arranged at corresponding positions on the connecting surfaces (4-1) of the left positioning plate and (5-1) of the right positioning plate. The nail (10) passes through the left positioning plate through hole (4-3) and the right positioning plate through hole (5-3) respectively, connecting the left positioning plate (4) and the right positioning plate (5) to the two cam mounting seats on the side (2-3) respectively; the left positioning plate locking hole (4-4) and the right positioning plate locking hole (5-4) are symmetrically arranged near the upper end of the left positioning plate through hole (4-3) and the right positioning plate through hole (5-3), and the set screw (11) passes through the left positioning plate locking hole (4-4) and the right positioning plate locking hole (5-4) to position the cam adjustment plate (3) and adjust and correct the horizontal position of the cam adjustment plate (3).

6. The adjustable mounting base for the involute cam of a precision gear grinding machine according to claim 5, characterized in that: The reference bushing (7) is a set of two stepped ring parts. The inner ring surface (7-4) can be fitted with the reference shaft through the ball bearing bushing to form a rotary shaft system of the adjustable mounting seat. The diameter of the large ring surface (7-1) of the reference bushing (7) is larger than the diameter of the small ring surface (7-2), forming a boss positioning structure.

7. The adjustable mounting base for the involute cam of a precision gear grinding machine according to claim 6, characterized in that: A guide ring (7-3) is provided near the end face of the small annular surface (7-2) of the reference bushing (7). The outer diameter of the guide ring (7-3) is smaller than that of the small annular surface (7-2). The entire small annular surface (7-2) is interference-fitted into the bushing fitting hole (2-4). The large annular end faces (7-5) of the two reference bushings (7) are parallel to each other and coaxial with the inner annular surface (7-4). The counterweight adjusting ring (8) is a set of two circular ring parts. The outer annular surface (8-1) of the adjusting ring is provided with a trapezoidal cross section. The ring groove (8-4) is shaped, and a locking hole (8-6) is provided at the bottom of the ring groove (8-4). The adjusting ring (8) is assembled on the large ring surface (7-1) of the two reference bushings (7) by inserting the set screw into the locking hole (8-6). The end face (8-3) of the adjusting ring is in close contact with the end face (2-1) of the cam mounting seat. The counterweight can be inserted from the slot (8-5). By adjusting the position of the counterweight in the adjusting ring (8), the center of gravity position of the adjustable mounting seat can be finely adjusted.

8. The adjustment method for the adjustable mounting base of the involute cam for a refining gear grinding machine according to claim 7, characterized in that, Includes the following steps: Step 1: Measure the involute cam (1) and calculate the positional deviation of the involute base circle center of the involute cam (1) relative to the axis center of the reference bushing (7); Step 2: Adjust the mounting position of the involute cam (1) relative to the cam mount (2) and the cam adjustment plate (3) to reduce the profile deviation of the involute cam (1); Step 3: Check the positional deviation of the involute base circle center of the adjusted involute cam (1) relative to the axis of the reference bushing (7). Repeat step 2 until the involute base circle center of the involute cam (1) coincides with the axis of the reference bushing (7). In step two: Establish a plane rectangular coordinate system with the axis of the reference bushing (7) as the origin, the straight line parallel to the mounting surface (2-2) of the cam adjustment plate of the cam mounting seat (2) as the X-axis, and the straight line perpendicular to the mounting surface (2-2) of the cam adjustment plate of the cam mounting seat (2) as the Y-axis. Measure the positions of the three points on the involute cam (1): the starting point of the involute, the highest point of the cam, and the ending point of the involute. Calculate the position of the center of the base circle of the involute cam (1), and thus calculate the positional deviation between the involute cam (1) and the axis of the reference bushing (7). Based on the position of the involute base circle center on the involute cam (1) calculated in step one, adjust the involute cam (1) so that the involute base circle center coincides with the axis of the reference bushing (7). The position adjustment of the involute cam (1) includes translation adjustment and rotation adjustment. The translation adjustment refers to the initial involute cam (1) being translated by a distance e along phase β. The translation distance e includes three displacement modes: the initial involute cam (1) moving upward and downward along phase β along the Y-axis, and the initial involute cam (1) moving horizontally along phase β along the X-axis. When the center of the involute base circle of the involute cam (1) is lower than the center of the reference bushing, a shim is added at the horizontal plane of the counterweight plate mounting surface (2-5) of the cam mounting seat (2) to make the involute cam (1) move upward along the Y axis. The translation distance e is determined by the thickness T1 of the shim, and the relationship is: e=T1, β=90°. When the center of the involute base circle of the involute cam (1) is higher than the center of the reference bushing, the involute cam (1) moves downward along the Y axis by grinding the mounting surface (2-2) of the cam adjustment plate of the cam mounting seat (2). The translation distance e is determined by the grinding depth T2, and the relationship is: e=T2, β=-90°; When there is a horizontal offset between the center of the involute base circle of the involute cam (1) and the center of the reference bushing (7), the screw (9) moves in the positioning through hole (3-6) of the cam adjustment plate (3), and moves the position of the cam adjustment plate (3) along the X-axis, so that the involute cam (1) moves in the horizontal direction. Adjust the set screw (11) on the left positioning plate (4) and the right positioning plate (5) to fix the cam adjustment plate (3). The translation distance e is determined by the displacement T3 of the cam adjustment plate (3), and the relationship is: e=T3, β=0° or β≈180°; The rotation adjustment is the rotation angle of the involute cam (1) around the initial involute cam (1) axis p(x,y) by θ. It can be decomposed into the rotation adjustment of the involute cam (1) around the center of the involute base circle and the translation adjustment of the involute cam (1) along the phase β by a distance e. The curve of the involute cam (1) after rotating around the center of the involute base circle is still the standard involute, only the initial development angle is delayed by θ, which does not affect the position change of the center of the involute base circle. By calculating the axis center p(x, y) of the involute cam (1) and using the cosine theorem, the equivalent translation distance e and its phase β can be obtained, e = (2 × (x, y)). 2 +y 2 )×(1-cos((θ))) 1 / 2 , β=π-arctan(y / x)-(π- |θ|) / 2; In step three: by measuring the positions of the three points on the adjusted involute cam (1)—the starting point of the involute, the highest point of the cam, and the ending point of the involute—the position of the center of the involute base circle is obtained. This verifies whether the adjustment of the involute cam (1) meets the accuracy requirements. If not, step two is repeated to continue adjusting the installation position of the involute cam (1) until the center of the involute base circle of the involute cam (1) coincides with the center of the reference bushing (7).

Images