Special processing equipment for reverse nut of planetary roller screw

Abstract

The invention relates to a special machining device for a reverse nut of a planetary roller screw, which is characterized by comprising a workbench, and a workpiece clamping center, a grinding unit and a turning unit which are arranged on the workbench, a grinding wheel dressing unit is arranged on one side of the workpiece clamping center, a workpiece is clamped on a workpiece clamp assembly in advance, and the grinding wheel dressing unit is arranged on the other side of the workpiece clamping center. Then an electric tool turret of a turning unit is made to be coaxial with the workpiece, the electric tool turret firstly turns an inner hole of the reverse nut semi-finished product, then a grinding component is adjusted to be coaxial with the turned reverse nut semi-finished product, a grinding electric spindle is driven, the grinding component grinds the inner hole of the reverse nut semi-finished product, and the inner hole of the reverse nut semi-finished product is ground. And finally, the dressing motorized spindle is driven, and the dressing grinding wheel is used for dressing the grinding component. According to the turning and grinding integrated technology, the reverse nut is machined in the mode that turning is conducted firstly and then grinding is conducted, the machining efficiency is high, and the production cost is greatly reduced.

Description

TECHNICAL FIELD

[0001] The application relates to a special machining device, in particular to a special machining device for reverse nut of planetary roller screw. BACKGROUND

[0002] With the rapid development of humanoid robots, the planetary roller screw has become an essential component of the joints of the humanoid robots. At present, the precision requirement of the reverse nut of the planetary roller screw is extremely high, the pitch error needs to be controlled within plus or minus 3 microns, and the helix angle consistency error is less than 10 angular seconds.

[0003] From the precision level, the transmission error of the planetary roller screw of the humanoid robot needs to be controlled within 8-18 microns, which needs to correspond to the precision requirements of C3 to C5 levels. The wrist joint of the humanoid robot optimus in the prior art needs to accurately grasp objects, and the lead accuracy of the planetary roller screw needs to reach C0 level (error less than 3.5 microns). It should be further pointed out that the planetary roller screw required by the current humanoid robot not only has high precision requirements, but also has a particularly long reverse internal thread. In order to ensure the machining precision, the internal thread of the reverse nut is ground, if the traditional grinding head is used for grinding, the grinding head will be interfered by the grinding rod, and the grinding depth will be limited, so the bending rod grinding head is used for grinding, which leads to lower grinding efficiency and higher cost. SUMMARY

[0004] The purpose of the application is to provide a special machining device for the reverse nut of the planetary roller screw, which processes the reverse nut by turning and grinding integration process, and processes the reverse nut by turning and grinding, which not only has high machining efficiency, but also greatly reduces the production cost.

[0005] In order to achieve the above purpose, the technical scheme of the application is: a special machining device for the reverse nut of the planetary roller screw, which is characterized by: comprising a workbench, a workpiece clamping center, a grinding unit and a turning unit arranged on the workbench, a grinding unit and a turning unit arranged on the workbench, one side of the workpiece clamping center is provided with a grinding wheel dressing unit,

[0006] The workpiece clamping center comprises a servo motor, a static pressure spindle and a workpiece clamp assembly, the power output shaft of the servo motor is in transmission connection with one end of the static pressure spindle, and the end portion of the other end of the static pressure spindle is provided with a workpiece clamp assembly for positioning and clamping the semi-finished product of the reverse nut,

[0007] The grinding unit comprises a grinding electric spindle and a grinding part, the grinding part for grinding the inner hole of the reverse nut is arranged on the power output shaft of the grinding electric spindle, and the reverse thread finishing of the reverse nut is implemented,

[0008] The grinding wheel dressing unit comprises a dressing electric spindle and a dressing grinding wheel, the dressing electric spindle is arranged on the outer sidewall of the housing of the static pressure spindle, and a dressing grinding wheel is arranged on the power output shaft of the dressing electric spindle to dress the grinding part,

[0009] The turning unit comprises an electric tool turret to turn the inner hole of the reverse nut,

[0010] During the working operation, the reverse nut semi-finished product is clamped on the workpiece clamp assembly in advance, then the electric tool turret of the turning unit is coaxial with the reverse nut semi-finished product, the inner hole of the reverse nut semi-finished product is first turned by the electric tool turret to coarsely process the reverse thread, then the grinding part is adjusted to be coaxial with the reverse nut semi-finished product after turning, the grinding electric spindle is driven, and the inner hole of the reverse nut semi-finished product is ground by the grinding part to finely process the reverse nut to complete the reverse thread processing of the reverse nut, finally the dressing electric spindle is driven, and the dressing grinding wheel dresses the grinding part.

[0011] In the above technical solution, the workbench is further provided with oppositely arranged X-direction sliding assemblies and Z-direction sliding assemblies, the workpiece clamping center is assembled and connected with the workbench through the X-direction sliding assemblies, so that the workpiece clamping center slides up and down along the workbench under the action of the X-direction sliding assemblies, and the grinding unit and the turning unit are both assembled and connected with the workbench through the Z-direction sliding assemblies, so that the grinding unit or the turning unit slides left and right along the workbench under the action of the Z-direction sliding assemblies and can be coaxial with the reverse nut on the workpiece clamp assembly.

[0012] In the above technical solution, the X-direction sliding assembly comprises an X-direction supporting plate, an X-direction static pressure guide rail and an X-direction servo motor, the X-direction static pressure guide rail is arranged on the workbench, and the X-direction supporting plate is in sliding fit with the X-direction static pressure guide rail, the power output shaft of the X-direction servo motor is in transmission connection with the X-direction supporting plate, and the workpiece clamping center is arranged on the X-direction supporting plate,

[0013] The X-direction servo motor is driven, and the workpiece clamping center slides along the X-direction static pressure guide rail under the action of the X-direction supporting plate;

[0014] The Z-direction sliding assembly comprises a Z-direction supporting plate, a Z-direction static pressure guide rail and a Z-direction servo motor, the Z-direction static pressure guide rail is arranged on the workbench, and the Z-direction supporting plate is in sliding fit with the Z-direction static pressure guide rail, the power output shaft of the Z-direction servo motor is in transmission connection with the Z-direction supporting plate, and the grinding unit and the turning unit are arranged side by side on the Z-direction supporting plate, and the grinding unit is close to the grinding wheel dressing unit,

[0015] The Z-direction servo motor is driven, and the grinding unit or the turning unit slides along the Z-direction static pressure guide rail under the action of the Z-direction supporting plate and can be coaxial with the reverse nut on the workpiece clamp assembly.

[0016] In the above technical solution, the workbench is further provided with X-direction sliding assembly and Z-direction sliding assembly arranged oppositely, the workpiece clamping center is assembled and connected with the workbench through the Z-direction sliding assembly, so that the workpiece clamping center slides left and right along the workbench under the action of the Z-direction sliding assembly, and the grinding unit and the turning unit are both assembled and connected with the workbench through the X-direction sliding assembly, so that the grinding unit or the turning unit slides left and right along the workbench under the action of the X-direction sliding assembly and can be coaxial with the reverse nut on the workpiece clamp assembly.

[0017] In the above technical solution, the Z-direction sliding assembly comprises a Z-direction supporting plate, a Z-direction static pressure guide rail and a Z-direction servo motor, the Z-direction static pressure guide rail is arranged on the workbench, the Z-direction supporting plate is in sliding fit with the Z-direction static pressure guide rail, the power output shaft of the Z-direction servo motor is in transmission connection with the Z-direction supporting plate, and the workpiece clamping center is arranged on the Z-direction supporting plate, and the grinding unit is close to the grinding wheel dressing unit,

[0018] The Z-direction servo motor is driven, and the workpiece clamping center slides along the Z-direction static pressure guide rail under the action of the Z-direction supporting plate;

[0019] The X-direction sliding assembly comprises an X-direction supporting plate, an X-direction static pressure guide rail and an X-direction servo motor, the X-direction static pressure guide rail is arranged on the workbench, the X-direction supporting plate is in sliding fit with the X-direction static pressure guide rail, the power output shaft of the X-direction servo motor is in transmission connection with the X-direction supporting plate, and the grinding unit and the turning unit are arranged side by side on the X-direction supporting plate,

[0020] The X-direction servo motor is driven, and the grinding unit or the turning unit slides along the X-direction static pressure guide rail under the action of the X-direction supporting plate and can be coaxial with the reverse nut on the workpiece clamp assembly.

[0021] In the above technical solution, the workbench is further provided with X-direction sliding assembly and Z-direction sliding assembly arranged oppositely with the workpiece clamping center, a cross slide structure is formed by the X-direction sliding assembly and the Z-direction sliding assembly, and the grinding unit and the turning unit are both arranged on the X-direction sliding assembly, so that the grinding unit or the turning unit slides left and right along the Z-direction sliding assembly under the action of the X-direction sliding assembly and can be coaxial with the reverse nut on the workpiece clamp assembly.

[0022] In the above technical solution, the Z-direction sliding assembly comprises a Z-direction supporting plate, a Z-direction static pressure guide rail and a Z-direction servo motor, the Z-direction static pressure guide rail is arranged on the workbench, the Z-direction supporting plate is in sliding fit with the Z-direction static pressure guide rail, the power output shaft of the Z-direction servo motor is in transmission connection with the Z-direction supporting plate,

[0023] The X-direction sliding assembly comprises an X-direction supporting plate, an X-direction hydrostatic guide rail and an X-direction servo motor, the X-direction hydrostatic guide rail is arranged on the Z-direction supporting plate, the X-direction supporting plate is in sliding fit with the X-direction hydrostatic guide rail, the power output shaft of the X-direction servo motor is in transmission connection with the X-direction supporting plate, the grinding unit and the turning unit are arranged side by side on the X-direction supporting plate,

[0024] The Z-direction servo motor is driven, and the X-direction hydrostatic guide rail slides along the Z-direction hydrostatic guide rail under the action of the Z-direction supporting plate;

[0025] The X-direction servo motor is further driven, and the grinding unit or the turning unit slides along the X-direction hydrostatic guide rail under the action of the X-direction supporting plate and can be coaxial with the reverse nut on the workpiece clamp assembly.

[0026] In the above technical solution, the workpiece clamp assembly comprises a clamping disc and a clamping block, the clamping disc is arranged at the end of the other end of the hydrostatic spindle, and the end face of the clamping disc is provided with clamping blocks arranged uniformly along the circumferential direction thereof, and the clamping block is provided with a clamping positioning surface capable of being positioned and attached to the outer circle of the reverse nut semi-finished product.

[0027] In the above technical solution, the dressing electric spindle is fixed on the outer side wall of the housing of the hydrostatic spindle through the mounting block.

[0028] In the above technical solution, the grinding part is a combined part composed of a tool holder and a grinding wheel, or is a bent rod grinding head,

[0029] When the grinding part is a combined part composed of a tool holder and a grinding wheel, the grinding wheel is arranged on the power output shaft of the grinding electric spindle through the tool holder,

[0030] When the grinding part is a bent rod grinding head, the bent rod grinding head is arranged on the power output shaft of the grinding electric spindle (31).

[0031] The present application has the following positive effects: after the special machining equipment for the reverse nut of the planetary roller screw is used, because the present application comprises a workbench, a workpiece clamping center, a grinding unit and a turning unit arranged on the workbench, one side of the workpiece clamping center is provided with a grinding wheel dressing unit,

[0032] The workpiece clamping center comprises a servo motor, a hydrostatic spindle and a workpiece clamp assembly, the power output shaft of the servo motor is in transmission connection with one end of the hydrostatic spindle, and the end of the other end of the hydrostatic spindle is provided with the workpiece clamp assembly for positioning and clamping the reverse nut semi-finished product,

[0033] The grinding unit comprises a grinding electric spindle and a grinding part, the power output shaft of the grinding electric spindle is provided with the grinding part for grinding the inner hole of the reverse nut, and the reverse thread finishing of the reverse nut is implemented,

[0034] The grinding wheel trimming unit comprises a trimming electric spindle and a trimming grinding wheel, the trimming electric spindle is arranged on the outer side wall of the housing of the static pressure spindle, and a trimming grinding wheel for trimming the grinding part is arranged on the power output shaft of the trimming electric spindle,

[0035] The turning unit comprises an electric tool turret for turning the inner hole of the reverse nut,

[0036] During the machining operation, the reverse nut semi-finished product is clamped on the workpiece clamp assembly in advance, then the electric tool turret of the turning unit is coaxial with the reverse nut semi-finished product, the inner hole of the reverse nut semi-finished product is first turned by the electric tool turret to implement rough machining of the reverse thread, then the grinding part is adjusted to be coaxial with the reverse nut semi-finished product after turning, the grinding electric spindle is driven, and the inner hole of the reverse nut semi-finished product is ground by the grinding part to implement finish machining of the reverse nut, the reverse thread machining of the reverse nut is completed, finally the trimming electric spindle is driven, and the trimming grinding wheel trims the grinding part,

[0037] The workpiece clamping center is used for clamping and positioning the reverse nut semi-finished product, so that the same reference is used for turning and grinding, and the turning and grinding can be completed by one-time clamping, and then the reverse nut is first hard turned by the turning unit, and then further ground by the grinding unit, so that the high vibration and high rigidity requirement of hard turning can be met, the extremely high feeding accuracy during grinding can be ensured, the reverse nut of the planetary roller screw is first hard turned to efficiently remove the excess amount, and then high-precision grinding is performed under the same reference mode, so that the high-precision planetary roller screw reverse nut is efficiently manufactured,

[0038] In summary, the reverse nut is first turned and then ground by the turning and grinding integrated process, so that the machining efficiency is high, and the production cost is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a three-dimensional structure schematic diagram of the first specific embodiment of the present application;

[0040] Figure 2 is another direction schematic diagram of Figure 1 ;

[0041] Figure 3 is a three-dimensional structure schematic diagram of the second specific embodiment of the present application;

[0042] Figure 4 is another direction schematic diagram of Figure 3 ;

[0043] Figure 5 is a three-dimensional structure schematic diagram of the third specific embodiment of the present application;

[0044] Figure 6 is Figure 5 another direction view. DETAILED DESCRIPTION

[0045] The application is further described below in conjunction with the accompanying drawings and examples given, but is not limited thereto.

[0046] Example 1

[0047] As shown in Figure 1 , 2 A special processing equipment for planetary roller screw reverse nut includes a workbench 1, a workpiece clamping center 2, a grinding unit 3 and a turning unit 5 arranged on the workbench 1, and a grinding wheel dressing unit 4 arranged on one side of the workpiece clamping center 2,

[0048] The workpiece clamping center 2 includes a servo motor 21, a static pressure spindle 22 and a workpiece clamp assembly 23, the power output shaft of the servo motor 21 is in transmission connection with one end of the static pressure spindle 22, and the end of the other end of the static pressure spindle 22 is provided with the workpiece clamp assembly 23 for positioning and clamping the reverse nut semi-finished product,

[0049] The grinding unit 3 includes a grinding electric spindle 31 and a grinding part 32, the grinding part 32 for grinding the inner hole of the reverse nut is arranged on the power output shaft of the grinding electric spindle 31, and the reverse thread finishing of the reverse nut is implemented,

[0050] The grinding wheel dressing unit 4 includes a dressing electric spindle 41 and a dressing grinding wheel 42, the dressing electric spindle 41 is arranged on the outer side wall of the housing of the static pressure spindle 22, and the dressing grinding wheel 42 for dressing the grinding part 32 is arranged on the power output shaft of the dressing electric spindle 41,

[0051] The turning unit 5 includes an electric knife tower 51 for turning the inner hole of the reverse nut,

[0052] During the machining operation, the reverse nut semi-finished product is clamped on the workpiece clamp assembly 23 in advance, then the electric knife tower 51 of the turning unit 5 is coaxial with the reverse nut semi-finished product, the inner hole of the reverse nut semi-finished product is first turned by the electric knife tower 51, the rough machining of the reverse thread is implemented, then the grinding part 32 is adjusted to be coaxial with the reverse nut semi-finished product after turning, the grinding electric spindle 31 is driven, and the inner hole of the reverse nut semi-finished product is ground by the grinding part 32, the finishing machining of the reverse nut is implemented, the reverse thread machining of the reverse nut is completed, and finally the dressing electric spindle 41 is driven, and the grinding wheel 42 dresses the grinding part 32.

[0053] Further, as shown in Figure 1 , 2As shown, in order to further ensure the machining precision, the workbench 1 is further provided with oppositely arranged X-direction sliding assembly 6 and Z-direction sliding assembly 7, the workpiece clamping center 2 is assembled and connected with the workbench 1 through the X-direction sliding assembly 6, so that the workpiece clamping center 2 slides up and down (X-direction) along the workbench 1 under the action of the X-direction sliding assembly 6, and the grinding unit 3 and the turning unit 5 are both assembled and connected with the workbench 1 through the Z-direction sliding assembly 7, so that the grinding unit 3 or the turning unit 5 slides left and right (Z-direction) along the workbench 1 under the action of the Z-direction sliding assembly 7 and can be coaxial with the reverse nut on the workpiece clamp assembly 23.

[0054] Since the planetary roller screw reverse nut itself is high-hardness steel and the hardness is about 60 degrees, the processing difficulty coefficient of hard turning is greatly increased, and the length of the reverse nut is particularly long, which belongs to a high-pitch inner hole, so that hard turning is more difficult. The present application has very high rigidity and precision, can ensure the smooth progress of hard turning, so that the planetary screw reverse nut is first subjected to hard turning to reach a surplus of 0.03mm, and then is further ground, thereby greatly improving the efficiency. The traditional grinding machine needs to grind an amount of 0.5mm, and the efficiency is very low.

[0055] Specifically, as shown in Figure 1 、 2 In order to ensure the turning precision and the grinding precision, the X-direction sliding assembly 6 comprises an X-direction supporting plate 61, an X-direction static pressure guide rail 62 and an X-direction servo motor 63, the X-direction static pressure guide rail 62 is arranged on the workbench 1, and the X-direction supporting plate 61 is in sliding fit with the X-direction static pressure guide rail 62, the power output shaft of the X-direction servo motor 63 is in transmission connection with the X-direction supporting plate 61, and the workpiece clamping center 2 is arranged on the X-direction supporting plate 61,

[0056] The X-direction servo motor 63 is driven, and the workpiece clamping center 2 slides along the X-direction static pressure guide rail 62 under the action of the X-direction supporting plate 61;

[0057] The Z-direction sliding assembly 7 comprises a Z-direction supporting plate 71, a Z-direction static pressure guide rail 72 and a Z-direction servo motor 73, the Z-direction static pressure guide rail 72 is arranged on the workbench 1, and the Z-direction supporting plate 71 is in sliding fit with the Z-direction static pressure guide rail 72, the power output shaft of the Z-direction servo motor 73 is in transmission connection with the Z-direction supporting plate 71, and the grinding unit 3 and the turning unit 5 are arranged side by side on the Z-direction supporting plate 71, and the grinding unit 3 is close to the grinding wheel dressing unit 4,

[0058] The Z-direction servo motor 73 is driven, and the grinding unit 3 or the turning unit 5 slides along the Z-direction static pressure guide rail 72 under the action of the Z-direction supporting plate 71 and can be coaxial with the reverse nut on the workpiece clamp assembly 23.

[0059] The structure of the present application can withstand the high vibration and high rigidity requirements of hard turning, and can also give very high feeding precision during grinding.

[0060] Further, as shown in Figure 1 , 2 In order to ensure that the reverse nut does not shake during the turning process, affecting the machining precision, the workpiece clamp assembly 23 includes a clamping disc 231 and a clamping block 232, the clamping disc 231 is arranged at the end of the other end of the static pressure spindle 22, and the end face of the clamping disc 231 is provided with clamping blocks 232 uniformly arranged along the circumferential direction, and the clamping block 232 is provided with a clamping positioning surface capable of positioning and fitting with the outer circle of the reverse nut semi-finished product.

[0061] Further, as shown in Figure 2 In order to make the structure more compact and reasonable, the finishing electric spindle 41 is fixed on the outer side wall of the housing of the static pressure spindle 22 through the mounting block 43.

[0062] Further, as shown in Figure 1 In order to ensure the grinding precision, the grinding component 32 is a combination of a tool holder and a grinding wheel, or a bent rod grinding head,

[0063] When the grinding component 32 is a combination of a tool holder and a grinding wheel, the grinding wheel is arranged on the power output shaft of the grinding electric spindle 31 through the tool holder,

[0064] When the grinding component 32 is a bent rod grinding head, the bent rod grinding head is arranged on the power output shaft of the grinding electric spindle 31.

[0065] The specific working process of embodiment 1:

[0066] Clamping: The reverse nut semi-finished product is clamped on the workpiece clamp assembly 23 in advance, that is, the reverse nut semi-finished product is clamped on the clamping disc 231, and the workpiece is positioned by the clamping block, ensuring that the clamping positioning surface of each clamping block 232 can be positioned and fitted with the outer circle of the workpiece,

[0067] Turning: The workpiece is positioned by the X-direction sliding assembly 6, the Z-direction servo motor 73 is driven, the turning unit 5 slides along the Z-direction static pressure guide rail 72 under the action of the Z-direction supporting plate 71, and can be coaxial with the reverse nut on the workpiece clamp assembly 23, the electric knife tower 51 is driven first to turn the workpiece to a margin of 0.03mm, and the rough machining of the reverse thread is implemented,

[0068] Grinding: The Z-direction servo motor 73 is driven again, the grinding unit 3 slides along the Z-direction static pressure guide rail 72 under the action of the Z-direction supporting plate 71, and can be coaxial with the reverse nut on the workpiece clamp assembly 23, at this time, the grinding electric spindle 31 is driven, and the workpiece is ground by the grinding component 32 to implement the finishing of the reverse nut, and the reverse thread machining of the reverse nut is completed,

[0069] Trimming: drive the Z servo motor 73 again, the grinding unit 3 slides along the Z static pressure guide rail 72 under the action of the Z supporting plate 71, and can be arranged opposite to the trimming grinding wheel 42, drive the trimming motorized spindle 41, the trimming grinding wheel 42 trims the grinding part 32, and the high-precision machining of the workpiece is completed.

[0070] Embodiment 2

[0071] Embodiment 2 is different from embodiment 1 in that, as shown in Figure 3 , 4 the workbench 1 is also provided with oppositely arranged X sliding assembly 6 and Z sliding assembly 7, the workpiece clamping center 2 is assembled and connected with the workbench 1 through the Z sliding assembly 7, so that the workpiece clamping center 2 slides left and right along the workbench 1 under the action of the Z sliding assembly 7, and the grinding unit 3 and the turning unit 5 are both assembled and connected with the workbench 1 through the X sliding assembly 6, so that the grinding unit 3 or the turning unit 5 slides left and right along the workbench 1 under the action of the X sliding assembly 6 and can be coaxial with the reverse nut on the workpiece clamp assembly 23.

[0072] The Z sliding assembly 7 includes a Z supporting plate 71, a Z static pressure guide rail 72 and a Z servo motor 73, the Z static pressure guide rail 72 is arranged on the workbench 1, and the Z supporting plate 71 is in sliding fit with the Z static pressure guide rail 72, the power output shaft of the Z servo motor 73 is in transmission connection with the Z supporting plate 71, the workpiece clamping center 2 is arranged on the Z supporting plate 71, and the grinding unit 3 is close to the grinding wheel trimming unit 4,

[0073] drive the Z servo motor 73, the workpiece clamping center 2 slides along the Z static pressure guide rail 72 under the action of the Z supporting plate 71;

[0074] The X sliding assembly 6 includes an X supporting plate 61, an X static pressure guide rail 62 and an X servo motor 63, the X static pressure guide rail 62 is arranged on the workbench 1, and the X supporting plate 61 is in sliding fit with the X static pressure guide rail 62, the power output shaft of the X servo motor 63 is in transmission connection with the X supporting plate 61, the grinding unit 3 and the turning unit 5 are arranged side by side on the X supporting plate 61,

[0075] drive the X servo motor 63, the grinding unit 3 or the turning unit 5 slides along the X static pressure guide rail 62 under the action of the X supporting plate 61, and can be coaxial with the reverse nut on the workpiece clamp assembly 23.

[0076] The other structures of embodiment 2 are exactly the same as those of embodiment 1.

[0077] Embodiment 3

[0078] Embodiment 3 is different from embodiment 1 in that, as shown inFigure 5 、 6 As shown in the figure, the workbench 1 is further provided with an X-direction sliding assembly 6 and a Z-direction sliding assembly 7 arranged opposite to the workpiece clamping center 2, a cross slide structure is formed by the X-direction sliding assembly 6 and the Z-direction sliding assembly 7, and the grinding unit 3 and the turning unit 5 are both arranged on the X-direction sliding assembly 6, so that the grinding unit 3 or the turning unit 5 slides left and right along the Z-direction sliding assembly 7 under the action of the X-direction sliding assembly 6 and can be coaxial with the reverse nut on the workpiece clamp assembly 23.

[0079] The Z-direction sliding assembly 7 comprises a Z-direction supporting plate 71, a Z-direction static pressure guide rail 72 and a Z-direction servo motor 73, the Z-direction static pressure guide rail 72 is arranged on the workbench 1, the Z-direction supporting plate 71 is in sliding fit with the Z-direction static pressure guide rail 72, and the power output shaft of the Z-direction servo motor 73 is in transmission connection with the Z-direction supporting plate 71.

[0080] The X-direction sliding assembly 6 comprises an X-direction supporting plate 61, an X-direction static pressure guide rail 62 and an X-direction servo motor 63, the X-direction static pressure guide rail 62 is arranged on the Z-direction supporting plate 71, the X-direction supporting plate 61 is in sliding fit with the X-direction static pressure guide rail 62, and the power output shaft of the X-direction servo motor 63 is in transmission connection with the X-direction supporting plate 61.

[0081] The Z-direction servo motor 73 is driven, and the X-direction static pressure guide rail 62 slides along the Z-direction static pressure guide rail 72 under the action of the Z-direction supporting plate 71.

[0082] The X-direction servo motor 63 is further driven, and the grinding unit 3 or the turning unit 5 slides along the X-direction static pressure guide rail 62 under the action of the X-direction supporting plate 61 and can be coaxial with the reverse nut on the workpiece clamp assembly 23.

[0083] Embodiments 2 and 3 are deformations of the combination assembly of the workpiece clamping center 2, the grinding unit 3 and the turning unit 5 with the X-direction sliding assembly 6 and the Z-direction sliding assembly 7 in Embodiment 1, and the working principles of Embodiments 1, 2 and 3 are the same, and the workpiece is coaxial with the grinding part or the electric knife tower through different actions of different units to achieve the purpose of high-precision turning or grinding of the workpiece.

[0084] The application clamps and positions the reverse nut semi-finished product through the workpiece clamping center, so as to ensure that turning and grinding adopt the same reference, and realize that turning and grinding can be completed once clamped, and then the application firstly performs hard turning of the reverse nut through the turning unit, and further performs grinding of the reverse nut through the grinding unit, the application can not only bear the high vibration and high rigidity requirement of hard turning, but also ensure the extremely high feeding precision during grinding, ensure that the reverse nut of the planetary roller screw is firstly hard turned to efficiently remove the excess amount, and then is ground in the same reference mode with high precision, so that the high-precision planetary roller screw reverse nut is efficiently manufactured.

[0085] In summary, the application processes the reverse nut through the turning and grinding integrated process, the turning and grinding mode, not only the processing efficiency is high, but also the production cost is greatly reduced.

[0086] Based on the above ideal embodiments according to the application, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the application. The technical scope of the application is not limited to the content in the specification, and must be determined according to the scope of claims.

Claims

1. A special processing equipment for reverse nuts of planetary roller screws, characterized in that: It includes a worktable (1), a workpiece clamping center (2), a grinding unit (3) and a turning unit (5) provided on the worktable (1), and a grinding wheel dressing unit (4) provided on one side of the workpiece clamping center (2). The workpiece clamping center (2) includes a servo motor (21), a hydrostatic spindle (22), and a workpiece clamping assembly (23). The power output shaft of the servo motor (21) is connected to one end of the hydrostatic spindle (22). The other end of the hydrostatic spindle (22) is provided with a workpiece clamping assembly (23) for positioning and clamping the reverse nut semi-finished product. The grinding unit (3) includes a grinding electric spindle (31) and a grinding component (32). The grinding electric spindle (31) has a grinding component (32) on its power output shaft for grinding the inner hole of the reverse nut, thereby performing reverse thread finishing on the reverse nut. The grinding wheel dressing unit (4) includes a dressing electric spindle (41) and a dressing grinding wheel (42). The dressing electric spindle (41) is located on the outer wall of the housing of the hydrostatic spindle (22). The power output shaft of the dressing electric spindle (41) is provided with a dressing grinding wheel (42) for dressing the grinding components (32). The turning unit (5) includes an electric turret (51) for turning the inner hole of a reverse nut. During the machining operation, the reverse nut semi-finished product is clamped on the workpiece fixture assembly (23) in advance. Then, the electric turret (51) of the turning unit (5) is made coaxial with the reverse nut semi-finished product. The electric turret (51) first turns the inner hole of the reverse nut semi-finished product to perform rough machining of the reverse thread. Then, the grinding component (32) is adjusted to be coaxial with the reverse nut semi-finished product after turning. The grinding electric spindle (31) is driven, and the grinding component (32) grinds the inner hole of the reverse nut semi-finished product to perform fine machining of the reverse nut and complete the reverse thread machining of the reverse nut. Finally, the dressing electric spindle (41) is driven, and the dressing grinding wheel (42) dresses the grinding component (32).

2. The special processing equipment for the reverse nut of the planetary roller screw according to claim 1, characterized in that: The worktable (1) is also provided with an X-axis sliding assembly (6) and a Z-axis sliding assembly (7) arranged opposite to each other. The workpiece clamping center (2) is assembled and connected to the worktable (1) through the X-axis sliding assembly (6), so that the workpiece clamping center (2) slides up and down along the worktable (1) under the action of the X-axis sliding assembly (6). The grinding unit (3) and the turning unit (5) are both assembled and connected to the worktable (1) through the Z-axis sliding assembly (7), so that the grinding unit (3) or the turning unit (5) slides left and right along the worktable (1) under the action of the Z-axis sliding assembly (7) and can be coaxial with the reverse nut on the workpiece clamping assembly (23).

3. The special processing equipment for the reverse nut of the planetary roller screw according to claim 2, characterized in that: The X-axis sliding assembly (6) includes an X-axis support plate (61), an X-axis hydrostatic guide rail (62), and an X-axis servo motor (63). The X-axis hydrostatic guide rail (62) is mounted on the worktable (1), and the X-axis support plate (61) and the X-axis hydrostatic guide rail (62) are slidably fitted together. The power output shaft of the X-axis servo motor (63) is connected to the X-axis support plate (61) via a transmission connection. The workpiece clamping center (2) is located on the X-axis support plate (61). Drive the X-axis servo motor (63), and the workpiece clamping center (2) slides along the X-axis hydrostatic guide rail (62) under the action of the X-axis support plate (61); The Z-axis sliding assembly (7) includes a Z-axis support plate (71), a Z-axis hydrostatic guide rail (72), and a Z-axis servo motor (73). The Z-axis hydrostatic guide rail (72) is mounted on the worktable (1), and the Z-axis support plate (71) and the Z-axis hydrostatic guide rail (72) are slidably fitted together. The power output shaft of the Z-axis servo motor (73) is connected to the Z-axis support plate (71) via a transmission. The grinding unit (3) and the turning unit (5) are arranged side by side on the Z-axis support plate (71), and the grinding unit (3) is close to the grinding wheel dressing unit (4). Drive the Z-axis servo motor (73), and the grinding unit (3) or turning unit (5) slides along the Z-axis hydrostatic guide rail (72) under the action of the Z-axis support plate (71), and can be coaxial with the reverse nut on the workpiece clamping assembly (23).

4. The special processing equipment for the reverse nut of the planetary roller screw according to claim 1, characterized in that: The worktable (1) is also provided with an X-axis sliding assembly (6) and a Z-axis sliding assembly (7) arranged opposite to each other. The workpiece clamping center (2) is assembled and connected to the worktable (1) through the Z-axis sliding assembly (7), so that the workpiece clamping center (2) slides left and right along the worktable (1) under the action of the Z-axis sliding assembly (7). The grinding unit (3) and the turning unit (5) are both assembled and connected to the worktable (1) through the X-axis sliding assembly (6), so that the grinding unit (3) or the turning unit (5) slides left and right along the worktable (1) under the action of the X-axis sliding assembly (6) and can be coaxial with the reverse nut on the workpiece clamping assembly (23).

5. The special processing equipment for the reverse nut of the planetary roller screw according to claim 4, characterized in that: The Z-axis sliding assembly (7) includes a Z-axis support plate (71), a Z-axis hydrostatic guide rail (72), and a Z-axis servo motor (73). The Z-axis hydrostatic guide rail (72) is mounted on the worktable (1), and the Z-axis support plate (71) and the Z-axis hydrostatic guide rail (72) are slidably fitted together. The power output shaft of the Z-axis servo motor (73) is connected to the Z-axis support plate (71) via a transmission. The workpiece clamping center (2) is located on the Z-axis support plate (71), and the grinding unit (3) is close to the grinding wheel dressing unit (4). Drive the Z-axis servo motor (73), and the workpiece clamping center (2) slides along the Z-axis hydrostatic guide rail (72) under the action of the Z-axis support plate (71); The X-axis sliding assembly (6) includes an X-axis support plate (61), an X-axis hydrostatic guide rail (62), and an X-axis servo motor (63). The X-axis hydrostatic guide rail (62) is mounted on the worktable (1), and the X-axis support plate (61) and the X-axis hydrostatic guide rail (62) are slidably fitted together. The power output shaft of the X-axis servo motor (63) is connected to the X-axis support plate (61) via a transmission. The grinding unit (3) and the turning unit (5) are arranged side by side on the X-axis support plate (61). Driven by the X-axis servo motor (63), the grinding unit (3) or turning unit (5) slides along the X-axis hydrostatic guide rail (62) under the action of the X-axis support plate (61) and can be coaxial with the reverse nut on the workpiece clamping assembly (23).

6. The special processing equipment for the reverse nut of the planetary roller screw according to claim 1, characterized in that: The worktable (1) is also provided with an X-axis sliding assembly (6) and a Z-axis sliding assembly (7) arranged opposite to the workpiece clamping center (2). The X-axis sliding assembly (6) and the Z-axis sliding assembly (7) form a cross slide structure. The grinding unit (3) and the turning unit (5) are both located on the X-axis sliding assembly (6), so that the grinding unit (3) or the turning unit (5) can slide left and right along the Z-axis sliding assembly (7) under the action of the X-axis sliding assembly (6) and can be coaxial with the reverse nut on the workpiece clamping assembly (23).

7. The special processing equipment for the reverse nut of the planetary roller screw according to claim 1, characterized in that: The Z-axis sliding assembly (7) includes a Z-axis support plate (71), a Z-axis hydrostatic guide rail (72), and a Z-axis servo motor (73). The Z-axis hydrostatic guide rail (72) is mounted on the worktable (1), and the Z-axis support plate (71) and the Z-axis hydrostatic guide rail (72) are slidably fitted together. The power output shaft of the Z-axis servo motor (73) is connected to the Z-axis support plate (71) via a transmission connection. The X-axis sliding assembly (6) includes an X-axis support plate (61), an X-axis hydrostatic guide rail (62), and an X-axis servo motor (63). The X-axis hydrostatic guide rail (62) is mounted on the Z-axis support plate (71), and the X-axis support plate (61) and the X-axis hydrostatic guide rail (62) are slidably fitted together. The power output shaft of the X-axis servo motor (63) is connected to the X-axis support plate (61) via a transmission connection. The grinding unit (3) and the turning unit (5) are arranged side by side on the X-axis support plate (61). Drive the Z-axis servo motor (73), and the X-axis hydrostatic guide rail (62) slides along the Z-axis hydrostatic guide rail (72) under the action of the Z-axis support plate (71); Then drive the X-axis servo motor (63), and the grinding unit (3) or turning unit (5) slides along the X-axis hydrostatic guide rail (62) under the action of the X-axis support plate (61), and can be coaxial with the reverse nut on the workpiece clamping assembly (23).

8. The special processing equipment for the reverse nut of the planetary roller screw according to claim 1, characterized in that: The workpiece clamping assembly (23) includes a clamping disc (231) and a clamping block (232). The clamping disc (231) is located at the end of the other end of the hydrostatic spindle (22), and the end face of the clamping disc (231) is provided with clamping blocks (232) evenly arranged along its circumference. The clamping block (232) is provided with a clamping positioning surface that can be positioned and fitted with the outer circle of the reverse nut semi-finished product.

9. The special processing equipment for the reverse nut of the planetary roller screw according to claim 1, characterized in that: The dressing electric spindle (41) is fixed to the outer wall of the housing of the hydrostatic spindle (22) by a mounting block (43).

10. The special processing equipment for the reverse nut of the planetary roller screw according to claim 1, characterized in that: The grinding component (32) is an assembly consisting of a tool holder and a grinding wheel, or a curved bar grinding head. When the grinding component (32) is an assembly consisting of a tool holder and a grinding wheel, the grinding wheel is mounted on the power output shaft of the grinding electric spindle (31) via the tool holder. When the grinding component (32) is a bent bar grinding head, the bent bar grinding head is mounted on the power output shaft of the grinding electric spindle (31).

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