Planetary roller screw precision performance test platform and test method

Abstract

The invention relates to a planetary roller screw precision performance test platform and test method. The technical problem that the existing planetary ball screw measurement efficiency is low is solved. Comprising a test box, a planetary roller lead screw motion system and a standard lead screw servo motion system which are arranged in the X / Y axis motion direction are arranged in the test box, a planetary roller lead screw is detachably installed on the planetary roller lead screw motion system, and a ball bar measuring system is installed between the planetary roller lead screw motion system and the standard lead screw servo motion system. And a servo shaft motion and acceleration control mechanism matched with the planetary roller screw motion system and the standard screw servo motion system is arranged in the test box. The device has the advantages that a replaceable planetary ball screw setting mode is adopted, a machined and assembled screw product is rapidly evaluated, and the requirement of continuous measurement in the production process is met. The integrated ball bar instrument can rapidly measure the axial positioning precision of the planetary roller screw, the data processing process is automatic, and the batch continuous measurement requirement is met.

Description

Technical Field

[0001] The present invention belongs to the technical field of precision mechanical measurement, and particularly relates to a planetary roller screw accuracy performance test platform and a test method. Background Art

[0002] With the rapid development of industrial automation and precision manufacturing, planetary roller screws and ball screws, as key transmission components, are increasingly widely used in fields such as aerospace, numerical control machine tools, and medical devices. Since foreign research on planetary roller screws started earlier, there is still a large gap in performance between domestic and foreign planetary roller screw products. In view of the performance differences between domestic and foreign planetary roller screw products, conducting performance tests is a key step to verify their performance. Most of the existing test devices have single functions and cannot meet the tests under heavy load, high speed, and high precision conditions. In addition, traditional detection methods are inefficient, complex to install, and the measurement information is weakly linked to the production process, seriously restricting the quality improvement and technological progress of products.

[0003] In order to solve the deficiencies existing in the prior art, people have conducted long-term explorations and proposed various solutions. For example, a Chinese patent document discloses a precision test device for a planetary roller screw [201510202315.9], which includes a workbench fixedly arranged on a base. The workbench has two working surfaces perpendicular to each other. A servo motor is fixedly arranged on the base through a motor support. A guide rail and a grating scale are fixed on the working surface of the workbench parallel to the base. A bearing block is arranged on the working surface of the workbench perpendicular to the base. A bearing is arranged inside the bearing block. A slider is arranged on the guide rail. A nut sleeve is connected to the slider and the moving scale of the grating scale. The nut of the planetary roller screw is fixedly connected to the nut sleeve. The screw shaft is fixedly connected to the inner ring of the bearing and is connected to the output shaft of the servo motor through an elastic coupling. An angle encoder is arranged on the bearing block, and the elastic coupling connected to the screw shaft of the planetary roller screw is locked by the inner ring of the angle encoder. Another example is that a Chinese patent document discloses a comprehensive performance measurement device and method for a heavy-duty planetary roller screw pair [201910851200.0], which includes a base assembly. A test device bearing frame is installed on the base assembly. One side of the test device bearing frame has a driving assembly. The driving assembly is connected to a pair of bearing assemblies. The bearing assemblies are installed on the test device bearing frame. A measured screw is installed on one of the bearing assemblies. The measured screw is connected to a screw transfer flange of the test assembly. The other bearing assembly is connected to a loading assembly. Another example is that a Chinese patent document discloses a test device for a 15t-class planetary roller screw [202010393089.8], which includes a base, a moving slide, a clamping device, a tensile and compressive sensor group, a braking device, and a screw to be tested. The moving slide, the clamping device, the tensile and compressive sensor group, and the braking device are all arranged on the upper surface of the base. The screw to be tested is axially horizontally arranged in the clamping device. The screw to be tested is axially placed along the long side direction of the base. And the moving slide, the clamping device, the tensile and compressive sensor group, and the braking device are sequentially placed along the axial direction of the screw to be tested. The output end of the moving slide is butted against the screw to be tested. One axial end of the screw to be tested is fixedly installed on the clamping device. One end of the clamping device is butted against one end of the tensile and compressive sensor group. The other end of the tensile and compressive sensor group is butted against the braking device. Another example is that a Chinese patent document discloses a comprehensive performance test device and method for a planetary roller screw [202310702359.2], which includes a bed body, a servo motor, a motor bracket, a coupling, a torque sensor, a coupling, a bearing block, a planetary roller screw actuating tooling, a measured planetary roller screw, a spherical plain bearing, a tensile and compressive sensor, a tensile and compressive sensor mounting bracket, a guide rail pair, a connecting plate, a hydraulic ear, a spherical plain bearing, a hydraulic loading device, a disc spring loading device, etc. Performance tests such as load-bearing, torque, vibration, temperature rise, efficiency, and life of the planetary roller screw are carried out. The actuating tooling of the planetary roller screw ensures the normal meshing state among the nut, rollers, and screw of the planetary roller screw.

[0004] The above solution solves to a certain extent the problem that the existing planetary ball screw cannot meet the tests under heavy load, high speed and high precision conditions. However, there are still many deficiencies in this solution. For example, the test efficiency of its planetary ball screw is relatively low. Summary of the Invention

[0005] The object of the present invention is to provide a precision performance test platform for a planetary roller screw aiming at the above problems.

[0006] Another object of the present invention is to provide a precision performance test method for a planetary roller screw aiming at the above problems.

[0007] To achieve the above object, the present invention adopts the following technical solutions: A precision performance test platform for a planetary roller screw includes a test box. Inside the test box, there is a planetary roller screw motion system and a standard screw servo motion system arranged in the X / Y axis movement directions. A planetary roller screw is detachably installed on the planetary roller screw motion system. A ball bar measuring system is installed between the planetary roller screw motion system and the standard screw servo motion system. Inside the test box, there is a servo axis motion and acceleration control mechanism cooperating with the planetary roller screw motion system and the standard screw servo motion system. The detachable planetary ball screw can improve the screw disassembly efficiency and measurement efficiency. Moreover, the ball bar measuring system has the advantages of convenient operation, high measurement efficiency and high measurement accuracy. Through the servo axis motion and acceleration control mechanism, acceleration signals can be collected and analyzed, and then the dynamic response of the planetary roller screw under different motion states can be judged.

[0008] In the above precision performance test platform for a planetary roller screw, the planetary roller screw motion system is horizontally arranged. The planetary roller screw motion system includes a servo system base horizontally arranged inside the test box. Installation brackets are correspondingly arranged at both ends of the servo system base. A plurality of motion guide columns are arranged between the installation brackets. A slider is slidably arranged on the motion guide columns. A planetary ball screw parallel to the motion guide columns and passing through the slider is detachably arranged between the installation brackets. And the planetary ball screw is connected to the slider through a planetary roller screw nut device. A nut fixing cover plate capable of fixing the planetary roller screw nut device is arranged at the upper end of the slider. A planetary roller screw servo motor is arranged on one of the installation brackets. The planetary roller screw servo motor is connected to one end of the planetary ball screw through a gear set inside the planetary roller screw transmission box body. Among them, the planetary roller screw servo motor can be transmitted through the planetary roller screw transmission box body to drive the planetary ball screw to rotate, which is convenient for driving and controlling the planetary ball screw and improving the measurement efficiency.

[0009] In the above-mentioned planetary roller screw precision performance test platform, centering chucks are respectively arranged on the corresponding sides of the mounting brackets through chuck bearings. The centering chucks are correspondingly arranged, and both ends of the planetary ball screw are clamped and positioned between the centering chucks. The chuck bearings can ensure the rotation effect of the planetary ball screw, and the method of fixing the planetary roller screw through the centering chucks can complete the replaceable installation of the planetary roller screw to achieve the rapid detection of the planetary ball screw during the production process.

[0010] In the above-mentioned planetary roller screw precision performance test platform, the standard screw servo motion system is arranged vertically. The standard screw servo motion system includes a motion transmission box body vertically arranged in the test box. The upper and lower ends of the motion transmission box body are respectively rotationally connected to both ends of the standard reference screw through mounting bearings. A standard reference screw movable seat is threadedly connected to the standard reference screw, and a number of motion guide rods parallel to the standard reference screw and slidably connected to the standard reference screw movable seat are arranged between the upper and lower ends of the motion transmission box body. A standard reference screw servo motor connected to the standard reference screw is arranged at the upper end of the motion transmission box body. The mounting bearings can improve the transmission effect of the standard reference screw, and the standard reference screw can be rotated through the standard reference screw servo motor. The motion guide rods can play a guiding role for the standard reference screw movable seat.

[0011] In the above-mentioned planetary roller screw precision performance test platform, the ball bar measuring system includes a ball bar. One end of the ball bar is magnetically connected to a telescopic precision position adjustment seat, and the other end is magnetically connected to a ball bar connecting magnetic seat. The ball bar connecting magnetic seat is magnetically fixed on the standard reference screw movable seat, and the telescopic precision position adjustment seat is magnetically fixed on the nut fixing cover plate. The ball bar can obtain the positioning error of the planetary roller screw motion system and the standard screw servo motion system in linear motion through the telescopic precision position adjustment seat and the ball bar connecting magnetic seat, which is convenient for the precision evaluation of the planetary ball screw.

[0012] In the above-mentioned planetary roller screw precision performance test platform, the servo axis motion and acceleration control mechanism includes a servo axis motion controller and an acceleration signal processor arranged on the test box. The servo axis motion controller and the acceleration signal processor are connected to an accelerometer arranged on the nut fixing cover plate. The accelerometer can collect and analyze the acceleration signal of the planetary ball screw, and can judge the dynamic response of the planetary roller screw under different motion states, improving the measurement effect.

[0013] In the above-mentioned planetary roller screw precision performance test platform, the test box includes a box body base and a box body arranged at the upper end of the box body base. An opening is provided at the upper end of the box body, and a flip-up box cover is connected to the opening through a hinge. An operating status indicator light is provided at the upper end of the box body, and a power supply, a control port, and an emergency stop button are provided on the outer side of the lower end. The motion transmission box body is vertically fixed on the box body base. The servo system base is connected to the installation connecting plate through screws, and the installation connecting plate is connected to the installation fixing plate vertically fixed on the box body base. A temperature control adjustment device is provided in the test box, and the temperature control adjustment device is connected to a cooling fan arranged on one side of the test box body. Through the installation connecting plate and the installation fixing plate, the servo system base can be conveniently fixed in the box body, and through the temperature control adjustment device, the dynamic precision of the planetary roller screw can be measured under different temperature conditions, so as to accurately and quickly measure the positioning precision of the planetary roller screw under different operating conditions. And through the cooling fan, the temperature in the box body can be quickly adjusted.

[0014] A method for testing the precision performance of a planetary roller screw, the method comprising the following steps:

[0015] S1. Adjust the planetary roller screw motion system and the standard screw servo motion system to the test position of the ball bar measuring system through the servo axis motion and acceleration control mechanism, and complete the installation and operation test of the ball bar measuring system.

[0016] S2. Calculate the remaining form error of the planetary roller screw according to the data collected from the operation test.

[0017] In the above-mentioned method for testing the precision performance of a planetary roller screw, the specific steps of step S1 include:

[0018] Step S1-1: Adjust the planetary roller screw and the standard reference screw to the test position of the ball bar measuring system by the servo axis motion controller and the acceleration signal processor.

[0019] Step S1-2: Install the telescopic precision position adjustment seat and the ball bar connection magnetic seat on the nut fixing cover plate of the planetary roller screw motion system and the movable seat of the standard reference screw respectively, and fix them magnetically therebetween.

[0020] Step S1-3: Adjust the axial positions of the telescopic precision position adjustment seat and the ball bar connection magnetic seat so that the middle of them completely fits the standard ball at the measuring end of the ball bar. At this time, record the reading of the telescopic precision position adjustment seat.

[0021] Step S1-4: After removing the standard ball, readjust the telescopic precision position adjustment seat to the reading position and lock it.

[0022] Step S1-5: After setting the measured radius value of 100 mm in the servo axis motion controller and the acceleration signal processor, run the test system to make each servo axis reach the correct position measured by the ballbar, then install the ballbar on the telescopic precision position adjustment seat and the ballbar connection magnetic seat, and then perform tests according to the standard ballbar test procedure.

[0023] In the above method for testing the precision performance of a planetary roller screw, the specific steps of step S2 include:

[0024] Step S2-1: Assume that the original measurement result of the ballbar is R i , the total length of the collected data is i, calculate the coordinates X i , Y i of the theoretical measurement points according to the machine tool instructions; and calculate the component magnitudes ΔX i and ΔY i of R i on the X and Y axes at each measurement point, where ΔX i = R i * Sin(θ i ) and ΔY i = R i * Cos(θ i ), and then reach the actual measurement points X i + ΔX i , Y i + ΔY i ;

[0025] Step S2-2: Use the least squares method to fit the original measurement data, eliminate the interference of "overall eccentricity" on subsequent shape analysis, find the new measurement center optimal radius and the coordinates x i , y i of each measurement point, and calculate the radius error under the new fitting center Calculate the remaining shape error, calculate the magnitude of the remaining shape error of each measurement point on the X and Y axes according to the measured scheduling position of the radius error, that is, ΔX' i = ε i * sin(θ i ) and ΔY' i = ε i * cos(θ i ); Analyze the change of the measured value of the remaining shape error on the motion axis of the planetary ball screw, calculate its mean value and maximum value to judge the precision state of the planetary roller screw;

[0026] Step S2-3: Through continuous monitoring, not only can the accuracy change trend of the planetary roller screw during batch processing be grasped, but also the stability of the processing process and the state and wear degree of the cutting tool can be evaluated, so as to timely judge whether the cutting tool needs to be replaced;

[0027] Step S2-4: Calculate ΔX′ i The mean value ΔX′ of the remaining form error of the planetary roller screw is used as the input to calculate the magnitude of the dynamic remaining form error, that is,

[0028] Step S2-5: Select a high-pass filter to process RE i , by setting to only retain signals above 10 Hz and calculating its peak-to-peak value; this peak-to-peak value can reflect the vibration intensity of the linear axis reciprocating motion of the planetary roller screw corresponding to the circular arc motion of the ballbar at the set feed speed, so as to evaluate the stability of the motion process.

[0029] Compared with the existing technology, the advantages of the present invention are as follows:

[0030] 1. Adopt a replaceable planetary ball screw setting mode to quickly evaluate the screw products completed in processing and assembly, and then guide the production process to meet the need for continuous measurement in the production process.

[0031] 2. Integrate a ballbar to quickly measure the axial positioning accuracy of the planetary roller screw. The measurement process is simple and convenient to adjust, and the data processing process is automated to meet the need for batch continuous measurement.

[0032] 3. Integrate an accelerometer to measure the motion stability of the planetary roller screw, and adopt a temperature control device to adjust different temperature states in the box to evaluate the high and low positioning accuracy of the planetary roller screw under different working conditions. Brief Description of the Drawings

[0033] Figure 1 is the structural schematic diagram of the present invention.

[0034] Figure 2 is the structural schematic diagram of the opening in the present invention.

[0035] Figure 3 is the structural schematic diagram of the planetary roller screw motion system in the present invention.

[0036] Figure 4 is the exploded view of the structure of the planetary roller screw motion system in the present invention.

[0037] Figure 5 is the structural schematic diagram of the standard screw servo motion system in the present invention.

[0038] In the figure: test box 1, box base 11, mounting fixed plate 111, box body 12, opening 13, hinge 14, flip-up lid 15, operating status indicator light 16, power supply and control port 17, emergency stop button 18, mounting connecting plate 19, planetary roller screw motion system 2, planetary roller screw 21, servo system base 22, mounting bracket 23, chuck bearing 231, centering chuck 232, motion guide post 24, slider 25, planetary roller screw nut device 26, nut fixing cover plate 27, planetary roller screw servo motor 28, standard screw servo motion system 3, motion transmission box body 31, mounting bearing 32, standard reference screw 33, standard reference screw movable seat 34, motion guide rod 35, standard reference screw servo motor 36, ball bar measuring system 4, ball bar 41, telescopic precision position adjustment seat 42, ball bar connecting magnetic seat 43, servo axis motion and acceleration control mechanism 5, servo axis motion controller and acceleration signal processor 51, accelerometer 52, planetary roller screw transmission box body 6, gear set 61, temperature control adjustment device 7, cooling fan 8. Detailed implementation mode

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0040] As Figure 1 , Figure 2 , Figure 3 , Figure 4 shown, a planetary roller screw accuracy performance test platform of the present invention includes a test box 1. Inside the test box 1, a planetary roller screw motion system 2 and a standard screw servo motion system 3 arranged in the X / Y axis movement direction are provided. A planetary roller screw 21 is detachably installed on the planetary roller screw motion system 2. A ball bar measuring system 4 is installed between the planetary roller screw motion system 2 and the standard screw servo motion system 3. Inside the test box 1, a servo axis motion and acceleration control mechanism 5 that cooperates with the planetary roller screw motion system 2 and the standard screw servo motion system 3 is provided. The detachably arranged planetary ball screw 21 can improve the screw disassembly efficiency and measurement efficiency. Moreover, the ball bar measuring system 4 has the advantages of convenient operation, high measurement efficiency, and high measurement accuracy. Through the servo axis motion and acceleration control mechanism 5, acceleration signals can be collected and analyzed, so as to judge the dynamic response of the planetary roller screw 21 under different motion states.

[0041] Specifically, the planetary roller screw motion system 2 is horizontally arranged. The planetary roller screw motion system 2 includes a servo system base 22 horizontally arranged in the test box 1. Installation brackets 23 are correspondingly provided at both ends of the servo system base 22. A number of motion guide columns 24 are arranged between the installation brackets 23. A slider 25 is slidably arranged on the motion guide columns 24. A planetary ball screw 21 parallel to the motion guide columns 24 and passing through the slider 25 is detachably arranged between the installation brackets 23. The installation brackets 23 facilitate the installation of the motion guide columns 24 and the planetary ball screw 21 on the servo system base 22. The planetary ball screw 21 is connected to the slider 25 through a planetary roller screw nut device 26. A nut fixing cover plate 27 capable of fixing the planetary roller screw nut device 26 is provided at the upper end of the slider 25. The planetary roller screw nut device 26 facilitates the sliding arrangement of the slider 25 on the planetary ball screw 21. A planetary roller screw servo motor 28 is provided on one of the installation brackets 23. The planetary roller screw servo motor 28 is connected to one end of the planetary ball screw 21 through a gear set 61 in the planetary roller screw transmission box body 6. The planetary roller screw servo motor 28 can be transmitted through the planetary roller screw transmission box body 6 to drive the planetary ball screw 21 to rotate, facilitating the drive control of the planetary ball screw 21 and improving the measurement efficiency.

[0042] Wherein, on the corresponding sides of the installation brackets 23, centering chucks 232 are respectively provided through chuck bearings 231. The centering chucks 232 are correspondingly arranged, and both ends of the planetary ball screw 21 are clamped and positioned between the centering chucks 232. The chuck bearings 231 can ensure the rotation effect of the planetary ball screw 21. And by the way of fixing the planetary roller screw 21 through the centering chucks 232, the replaceable installation of the planetary roller screw 21 can be completed to realize the rapid detection of the planetary ball screw 21 in the production process.

[0043] As Figure 3 、 Figure 4 、 Figure 5 shown, the standard screw servo motion system 3 is vertically arranged. The standard screw servo motion system 3 includes a motion transmission box body 31 vertically arranged in the test box 1. The upper and lower ends of the motion transmission box body 31 are respectively rotationally connected to both ends of a standard reference screw 33 through installation bearings 32. A standard reference screw movable seat 34 is threadedly connected to the standard reference screw 33, and a number of motion guide rods 35 parallel to the standard reference screw 33 and slidably connected to the standard reference screw movable seat 34 are arranged between the upper and lower ends of the motion transmission box body 31. A standard reference screw servo motor 36 connected to the standard reference screw 33 is provided at the upper end of the motion transmission box body 31. The installation bearings 32 can improve the transmission effect of the standard reference screw 33. And the standard reference screw 33 can be rotated through the standard reference screw servo motor 36. The motion guide rods 35 can play a guiding role in the standard reference screw movable seat 34.

[0044] Furthermore, the ballbar measuring system 4 includes a ballbar 41. One end of the ballbar 41 is magnetically connected to a telescopic precision position adjustment seat 42, and the other end is magnetically connected to a ballbar connecting magnetic seat 43. The ballbar connecting magnetic seat 43 is magnetically fixed on the standard reference lead screw moving seat 34, and the telescopic precision position adjustment seat 42 is magnetically fixed on the nut fixing cover plate 27. The ballbar 41 can obtain the positioning error of the planetary roller screw motion system 2 and the standard screw servo motion system 3 in linear motion through the telescopic precision position adjustment seat 42 and the ballbar connecting magnetic seat 43, which is convenient for the accuracy evaluation of the planetary ball screw 21.

[0045] Among them, the servo axis motion and acceleration control mechanism 5 includes a servo axis motion controller and an acceleration signal processor 51 arranged on the test box 1. The servo axis motion controller and the acceleration signal processor 51 are connected to an accelerometer 52 arranged on the nut fixing cover plate 27. The accelerometer 52 can collect and analyze the acceleration signal of the planetary ball screw 21, and can judge the dynamic response of the planetary roller screw 21 under different motion states, improving the measurement effect.

[0046] Combined Figure 1 、 Figure 2 、 Figure 3 As shown, the test box 1 includes a box body base 11 and a box body 12 arranged at the upper end of the box body base 11. There is an opening 13 at the upper end of the box body 12, and a flip-up box cover 15 is connected to the opening 13 through a hinge 14. The flip-up box cover 15 is folded from low-strength structural steel plates to ensure service life. Through the hinge 14 and the flip-up box cover 15, it is convenient for users to quickly replace the planetary ball screw 21. There is an operating status indicator light 16 at the upper end of the box body 12, and a power supply and control port 17 and an emergency stop button 18 are arranged on the outer side of the lower end. Through the operating status indicator light 16, it is convenient for users to observe from the outside. Through the power supply and control port 17, it is convenient for users to perform control operations, and through the emergency stop button 18, it is convenient for users to quickly stop in case of emergency, reducing user losses. The motion transmission box body 31 is vertically fixed on the box body base 11. The servo system base 22 is connected to the installation connecting plate 19 through screws, and the installation connecting plate 19 is connected to the installation fixing plate 111 vertically fixed on the box body base 11. A temperature control adjustment device 7 is arranged in the test box 1, and the temperature control adjustment device 7 is connected to a cooling fan 8 arranged on one side of the test box 1 body. Through the installation connecting plate 19 and the installation fixing plate 111, it is convenient to fixedly arrange the servo system base 22 in the box body 12, and through the temperature control adjustment device 7, the dynamic accuracy of the planetary roller screw 21 can be measured under different temperature states, so as to accurately and quickly measure the positioning accuracy of the planetary roller screw 21 under different operating conditions, and through the cooling fan 8, the temperature in the box body 12 can be quickly adjusted.

[0047] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 shown, a method for testing the precision performance of a planetary roller screw of a planetary roller screw precision performance test platform, the method comprising the following steps:

[0048] S1. Adjust the planetary roller screw motion system 2 and the standard screw servo motion system 3 to the test position of the ball bar measuring system 4 through the servo axis motion and acceleration control mechanism 5, and complete the installation of the ball bar measuring system 4, and run the test.

[0049] S2. Calculate the remaining form error of the planetary roller screw 21 according to the data collected from the running test.

[0050] Specifically, the specific steps of step S1 include:

[0051] Step S1-1: Adjust the planetary roller screw 21 and the standard reference screw 33 to the test position of the ball bar measuring system 4 by the servo axis motion controller and the acceleration signal processor 51;

[0052] Step S1-2: Install the telescopic precision position adjustment seat 42 and the ball bar connection magnetic seat 43 on the nut fixing cover plate 27 of the planetary roller screw motion system 2 and the standard reference screw movable seat 34 respectively, and fix them magnetically therebetween;

[0053] Step S1-3: Adjust the axial positions of the telescopic precision position adjustment seat and the ball bar connection magnetic seat so that their middle parts are completely fitted with the standard ball at the measuring end of the ball bar 41. At this time, record the reading of the telescopic precision position adjustment seat 42;

[0054] Step S1-4: After removing the standard ball, readjust the telescopic precision position adjustment seat 42 to the reading position and lock it; after setting the measured radius value of 100 mm in the servo axis motion controller and the acceleration signal processor 51, run the test system to make each servo axis reach the correct position measured by the ball bar 41, and then install the ball bar 41 on the telescopic precision position adjustment seat 42 and the ball bar connection magnetic seat 43, and then perform the test according to the test process of the standard ball bar 41.

[0055] Among them, the specific steps of step S2 include:

[0056] Step S2-1: Assume that the original measurement result of the ball bar 41 is R i , the total length i of the collected data, and calculate the coordinates X i of the theoretical measurement point according to the machine tool instruction, i; and calculate R at each measurement point i The component magnitudes ΔX of R on the X and Y axes i and ΔY i , where, ∧X i = R i *Sin(θ i ) and ∧Y i = R i *Cos(θ i ), and then reach the actual measurement points X i +ΔX i , Y i +ΔY i ;

[0057] Step S2-2: Use the least squares method to fit the original measurement data, eliminate the interference of "overall eccentricity" on subsequent shape analysis, and find the new measurement center Optimal radius and the coordinates x i , y i of each measurement point, and calculate the radius error under the new fitted center Calculate the remaining shape error, and calculate the magnitude of the remaining shape error of each measurement point on the X and Y axes according to the measured scheduling position, that is, ΔX′ i = ε i *sin(θ i ) and ΔY′ i = ε i *cos(θ i );

[0058] Step S2-3: Analyze the change of the measured value of the remaining shape error on the moving axis of the planetary ball screw, calculate its mean value and maximum value to judge the precision state of the planetary roller screw; through continuous monitoring, not only can the precision change trend of the planetary roller screw in batch processing be grasped, but also the stability of the processing process and the state and wear degree of the tool can be evaluated, so as to judge in time whether the tool needs to be replaced;

[0059] Step S2-4: Calculate the mean value of the remaining shape error of ΔX′ i of the planetary roller screw Take it as the input and calculate the magnitude of the dynamic remaining shape error, that is

[0060] Step S2-5: Select a high-pass filter to process RE i , by setting to only retain signals above 10Hz and calculate its peak-to-peak value; this peak-to-peak value can reflect the vibration intensity of the linear axis reciprocating motion of the planetary roller screw corresponding to the circular motion of the ball bar at the set feed speed, so as to evaluate the stability of the motion process.

[0061] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0062] Although terms such as test chamber 1, chamber base 11, mounting fixed plate 111, chamber 12, opening 13, hinge 14, flip-up chamber lid 15, operating status indicator light 16, power supply and control port 17, emergency stop button 18, mounting connection plate 19, planetary roller screw motion system 2, planetary roller screw 21, servo system base 22, mounting bracket 23, chuck bearing 231, centering chuck 232, motion guide post 24, slider 25, planetary ball screw 21, planetary roller screw nut device 26, nut fixing cover plate 27, planetary roller screw servo motor 28, standard screw servo motion system 3, motion transmission housing 31, mounting bearing 32, standard reference screw 33, standard reference screw movable seat 34, motion guide rod 35, standard reference screw servo motor 36, ballbar measurement system 4, ballbar 41, telescopic precision position adjustment base 42, ballbar connection magnetic seat 43, servo axis motion and acceleration control mechanism 5, servo axis motion controller and acceleration signal processor 51, accelerometer 52, planetary roller screw transmission housing 6, gear set 61, temperature control adjustment device 7, cooling fan 8 are used more frequently herein, the possibility of using other terms is not excluded. The use of these terms is only for more conveniently describing and explaining the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A planetary roller screw precision performance test platform, including a test box (1), characterized in that Inside the described test chamber (1), there is a planetary roller screw motion system (2) and a standard screw servo motion system (3) arranged in the X / Y axis movement directions. A planetary roller screw (21) is detachably installed on the planetary roller screw motion system (2). A ball bar measuring system (4) is installed between the planetary roller screw motion system (2) and the standard screw servo motion system (3). Inside the test chamber (1), there is a servo axis motion and acceleration control mechanism (5) that cooperates with the planetary roller screw motion system (2) and the standard screw servo motion system (3).

2. The precision performance test platform of a planetary roller screw according to claim 1, characterized in that , The planetary roller screw motion system (2) is horizontally arranged. The planetary roller screw motion system (2) includes a servo system base (22) horizontally arranged inside the test chamber (1). At both ends of the servo system base (22), corresponding mounting brackets (23) are provided. Between the mounting brackets (23), several motion guide columns (24) are provided. A slider (25) is slidably arranged on the motion guide columns (24). Between the mounting brackets (23), a planetary ball screw (21) parallel to the motion guide columns (24) and passing through the slider (25) is detachably provided. And the planetary ball screw (21) is connected to the slider (25) through a planetary roller screw nut device (26). At the upper end of the slider (25), there is a nut fixing cover plate (27) that can fix the planetary roller screw nut device (26). A planetary roller screw servo motor (28) is provided on one of the mounting brackets (23). The planetary roller screw servo motor (28) is connected to one end of the planetary ball screw (21) through a gear set (61) inside a planetary roller screw transmission box body (6).

3. The precision performance test platform of a planetary roller screw according to claim 2, characterized in that , On the corresponding sides of the mounting brackets (23), centering chucks (232) are respectively provided through chuck bearings (231). The centering chucks (232) are correspondingly arranged, and both ends of the planetary ball screw (21) are clamped and positioned between the centering chucks (232).

4. A planetary roller screw accuracy performance test platform according to claim 2 or 3, characterized in that , The standard screw servo motion system (3) is vertically arranged. The standard screw servo motion system (3) includes a motion transmission box body (31) vertically arranged inside the test chamber (1). The upper and lower ends of the motion transmission box body (31) are respectively rotatably connected to both ends of a standard reference screw (33) through mounting bearings (32). A standard reference screw movable seat (34) is threadedly connected to the standard reference screw (33), and several motion guide rods (35) parallel to the standard reference screw (33) and slidably connected to the standard reference screw movable seat (34) are provided between the upper and lower ends of the motion transmission box body (31). A standard reference screw servo motor (36) connected to the standard reference screw (33) is provided at the upper end of the motion transmission box body (31).

5. A planetary roller screw accuracy performance test platform according to claim 4, characterized in that , The described ballbar measurement system (4) includes a ballbar (41). One end of the ballbar (41) is magnetically connected to a telescopic precision position adjustment base (42), and the other end is magnetically connected to a ballbar connection magnetic base (43). The ballbar connection magnetic base (43) is magnetically fixed on the standard reference lead screw moving base (34), and the telescopic precision position adjustment base (42) is magnetically fixed on the nut fixed cover plate (27).

6. The precision performance test platform of a planetary roller screw according to claim 4, characterized in that , The described servo axis motion and acceleration control mechanism (5) includes a servo axis motion controller and acceleration signal processor (51) provided on the test box (1). The servo axis motion controller and acceleration signal processor (51) are connected to an accelerometer (52) provided on the nut fixed cover plate (27).

7. The precision performance test platform of a planetary roller screw according to claim 4, characterized in that , The described test box (1) includes a box body base (11) and a box body (12) provided at the upper end of the box body base (11). An opening (13) is provided at the upper end of the box body (12), and a flip-up box cover (15) is connected to the opening (13) through a hinge (14). An operating status indicator light (16) is provided at the upper end of the box body (12), and a power supply and control port (17) and an emergency stop button (18) are provided on the outer side of the lower end. The motion transmission box body (31) is vertically fixed on the box body base (11). The servo system base (22) is connected to the mounting connecting plate (19) through screws, and the mounting connecting plate (19) is connected to the mounting fixing plate (111) vertically fixed on the box body base (11). A temperature control adjustment device (7) is provided inside the test box (1), and the temperature control adjustment device (7) is connected to a cooling fan (8) provided on one side of the test box (1) body.

8. A method for testing the accuracy performance of a planetary roller screw of a planetary roller screw accuracy performance test platform according to any one of claims 1-8, characterized in that , This method includes the following steps: S1. Adjust the planetary roller screw motion system (2) and the standard screw servo motion system (3) to the test position of the ballbar measurement system (4) through the servo axis motion and acceleration control mechanism (5), and complete the installation and operation test of the ballbar measurement system (4). S2. Calculate the remaining form error of the planetary roller screw (21) based on the data collected during the operation test.

9. A method for testing the precision performance of a planetary roller screw according to claim 8, characterized in that, The specific steps of the described step S1 include: Step S1-1: Adjust the planetary roller screw (21) and the standard reference lead screw (33) to the test position of the ballbar measurement system (4) by the servo axis motion controller and acceleration signal processor (51). Step S1-2: Install the telescopic precision position adjustment base (42) and the ballbar connection magnetic base (43) on the nut fixed cover plate (27) of the planetary roller screw motion system (2) and the standard reference lead screw moving base (34) respectively, and fix them magnetically between them. Step S1-3: Adjust the axial positions of the telescopic precision position adjustment base and the ballbar connection magnetic base so that their middle parts are completely fitted to the standard ball at the measurement end of the ballbar (41). At this time, record the reading of the telescopic precision position adjustment base (42). Step S1-4: After removing the standard ball, readjust the retractable precision position adjusting seat (42) to the reading position and lock it; after setting the measured radius value of 100 mm in the servo axis motion controller and the acceleration signal processor (51), run the test system to make each servo axis reach the correct position measured by the ball bar (41), then install the ball bar (41) on the retractable precision position adjusting seat (42) and the ball bar connecting magnetic base (43), and then perform the test according to the test process of the standard ball bar (41).

10. A method for testing the precision performance of a planetary roller screw according to claim 8, characterized in that, The specific steps of the described step S2 include: Step S2-1: Assume that the original measurement result of the ball bar (41) is R i , the total length of the collected data is i, and calculate the coordinates (X i , Y i ) of the theoretical measurement points according to the machine tool instructions; and calculate the magnitudes of the components of R i on the X and Y axes at each measurement point, ΔX i and ΔY i , where ΔX i = R i * Sin(θ i ) and ΔY i = T i * Cos(θ i ), and then obtain the actual measurement points (X i + ΔX i , Y i + ΔY i ); Step S2-2: Use the least squares method to fit the original measurement data, eliminate the interference of "overall eccentricity" on subsequent shape analysis, and find a new measurement center Optimal radius and the coordinates (x i , y i ) of each measurement point, and calculate the radius error under the new fitting center Calculate the remaining shape error. According to the measured scheduling position of the radius error, calculate the magnitude of the remaining shape error of each measurement point on the X and Y axes, that is, ΔX′ i = ε i * Sin(θ i ) and ΔY′ i = ε i * cos(θ i ); Analyze the change in the measured value of the remaining shape error on the moving axis of the planetary ball screw, and calculate its mean value and maximum value to judge the accuracy state of the planetary roller screw; Step S2-3: Through continuous monitoring, the stability of the machining process and the state and wear degree of the cutting tool can be evaluated, so as to judge in time whether the cutting tool needs to be replaced; Step S2-4: Calculate ΔX′ i The mean value of (the remaining form error of the planetary roller screw) Taking this as the input, calculate the magnitude of the dynamic remaining form error, that is Step S2-5: Select a high-pass filter to process RE i , by setting to retain only signals above 10 Hz and calculating its peak-to-peak value.

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