A test device and method for equivalent testing of thermal characteristics of high-speed roller screw

Abstract

The application is suitable for the high-rotation performance test field of roller screw, and provides a test device and method for high-speed roller screw thermal characteristic equivalent test.The device comprises a workbench, the inner side of the workbench is respectively provided with a screw rotation table, a roller rotation table and an axial load applying device;the roller rotation table can be adjusted in position relative to the screw rotation table, so that the two screw threads of the roller rotation table and the screw rotation table are in contact;the axial load applying device is connected with the roller rotation table, and is used for adjusting the axial load;the rear inner wall of the workbench is further provided with a non-contact temperature sensor.The application is suitable for the roller screw in high-speed rotation state with a peak rotation speed of 20000 RPM, simulates the actual working process of the roller screw pair under high-speed rotation, and meets the test requirements of the roller screw thermal characteristic equivalent test under high rotation speed, variable load, one-way or two-way loading.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of high-speed performance test of roller screw, and particularly relates to a test device and method for equivalent test of thermal characteristics of high-speed roller screw. BACKGROUND

[0002] As an important transmission element on high-precision machinery, the roller screw is widely used in the fields of aerospace, high-precision machine tools and automobiles due to its small lead, high efficiency, large load and long service life, etc. In recent years, with the rapid development of China's equipment manufacturing industry, higher requirements for high-speed roller screws have been put forward in the fields of aerospace vehicles, high-end machining equipment and weapon equipment.

[0003] The roller screw transmits motion and force through friction, so there is a large frictional resistance in the process of roller screw movement. At the same time, in order to meet the feed speed in linear transmission, it is necessary to ensure the rotation speed of the roller screw. Under the condition of large friction and high speed, the roller screw will bear a large amount of friction heat in the process of movement, causing the internal temperature of the roller screw to rise, and further causing damage to the thread surface, resulting in a decrease in load capacity and transmission precision. In order to ensure the load capacity, transmission precision and transmission efficiency of the roller screw under high speed, it is necessary to conduct a thermal characteristic test of the roller screw under high-speed rotation, so as to ensure the reliability of the roller screw and at the same time to conduct targeted analysis and research on the test results, so as to improve the performance of the roller screw under high-speed rotation and provide a basis for establishing a stable and reliable process system.

[0004] Therefore, it is an urgent problem for those skilled in the art to design a test device for equivalent test of thermal characteristics of high-speed roller screw to simulate the process of one-way or two-way high-speed rotation, facilitate the analysis and research on the thermal characteristics of the roller screw under high speed, obtain the performance parameters such as friction temperature rise of the roller screw under high speed, and detect whether the product meets the design requirements, so as to improve the product quality of the roller screw. SUMMARY

[0005] The purpose of the embodiment of the present application is to provide a test device and method for equivalent test of thermal characteristics of high-speed roller screw, which aims to solve the problems mentioned in the above background.

[0006] The embodiment of the application is implemented in the following manner: a test device for testing the thermal characteristics of a high-speed roller screw, comprising a workbench, a screw rotating table, a roller rotating table and an axial load applying device are respectively arranged on the inner side of the workbench; the roller rotating table can be adjusted in position relative to the screw rotating table, so that the two screw threads of the roller rotating table and the screw rotating table are in contact; the axial load applying device is connected with the roller rotating table, and is used for adjusting the axial load; a non-contact temperature sensor for collecting data of the temperature of the contact area of the two screw threads of the roller rotating table and the screw rotating table is further arranged on the inner wall of the rear side of the workbench.

[0007] In a further technical scheme, the screw rotating table, the roller rotating table and the axial load applying device are sequentially arranged along the length direction of the workbench.

[0008] In a further technical scheme, the screw rotating table is fixedly arranged on the upper surface of the workbench base; the roller rotating table is movably arranged on the workbench base; and the axial load applying device is further fixedly arranged on the workbench base.

[0009] In a further technical scheme, the screw rotating table comprises a fixed pedestal, a first electric spindle, a first coupling, a first bearing box and a to-be-tested screw, the fixed pedestal is fixedly arranged on the workbench base, the first electric spindle, the first coupling and the to-be-tested screw are coaxially and sequentially arranged on the fixed pedestal from left to right, the first bearing box is fixed on the fixed pedestal and is further rotationally connected with the to-be-tested screw; and the first electric spindle is used for controlling the forward and reverse rotation of the to-be-tested screw and controlling the rotation speed of the to-be-tested screw.

[0010] In a further technical scheme, the roller rotating table comprises a slide rail, a movable slide table, a second electric spindle, a second coupling, a second bearing box and a to-be-tested roller, the slide rail is fixedly arranged on the workbench base, the movable slide table is slidably arranged on the slide rail, the second electric spindle, the second coupling and the to-be-tested roller are coaxially and sequentially arranged on the movable slide table from right to left, the second bearing box is fixed on the movable slide table and is further rotationally connected with the to-be-tested roller; and the second electric spindle is used for controlling the forward and reverse rotation of the to-be-tested roller and controlling the rotation speed of the to-be-tested roller.

[0011] In a further technical scheme, the to-be-tested roller and the to-be-tested screw are coaxially arranged.

[0012] In a further technical scheme, the axial load applying device comprises a screw rod, a retainer, a spring and a force sensor, the retainer is fixedly arranged on the workbench base, the screw rod is threadedly connected to the retainer, the force sensor is connected to the end of the screw rod close to the roller rotating table through the spring, and the force sensor is further connected with the movable slide table.

[0013] Further technical solutions, the non-contact temperature sensor corresponds to the to-be-measured screw and the to-be-measured roller, and the non-contact temperature sensor is used for collecting temperature data of the region between the to-be-measured screw and the to-be-measured roller.

[0014] Another purpose of the embodiment of the present application is a test method of a test device for equivalent testing of thermal characteristics of a high-speed roller screw, comprising the following steps:

[0015] Step 1, adjust the position of the roller rotation table so that the to-be-measured roller is in contact with the to-be-measured screw thread;

[0016] Step 2, turn on the non-contact temperature sensor to collect temperature data of the to-be-measured screw and the to-be-measured roller;

[0017] Step 3, the first electric spindle and the second electric spindle are started at the same time, the to-be-measured screw is rotated by the first electric spindle, and the to-be-measured roller is rotated by the second electric spindle; the screw is rotated, the force is applied to the force sensor at the moving end, the spring is adjusted to adjust the stress gap, and the axial force is loaded and collected;

[0018] Step 4, by adjusting the output rotation speed of the first electric spindle and the second electric spindle, the temperature data of the roller screw under different rotation speeds is obtained.

[0019] Further technical solutions, when the to-be-measured roller and the to-be-measured screw are tested for equivalent testing of thermal characteristics, the maximum rotation speed is 20000RPM, the maximum axial loading force is 300N, and the maximum loading stroke is 500mm.

[0020] The test device for equivalent testing of thermal characteristics of a high-speed roller screw provided by the embodiment of the present application applies force to the roller rotation table through the axial load applying device, realizes visualization and convenience of the load, rotates the screw and the roller by using the screw rotation table and the roller rotation table respectively, realizes one-way or two-way high-speed rotation of the roller screw pair, and realizes real-time detection of the temperature rise change during the roller and the screw friction process by using the non-contact temperature sensor.

[0021] The device has the advantages of simple structure, simple operation in the loading process, intuitive visualization of the load size, adjustable stress gap, convenient temperature rise data collection, etc., can intuitively detect the temperature rise between the contact surfaces of the screw and the roller, has high testing efficiency and accuracy, and can solve the problem of difficulty in testing the thermal characteristics of the roller screw during one-way or two-way high-speed rotation, and provide experimental data for performance improvement of the roller screw pair. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The structure diagram of the test device for equivalent testing of thermal characteristics of a high-speed roller screw provided by the embodiment of the present application is shown in the figure;

[0023] Figure 2 A schematic diagram of the screw rotary table portion in the test apparatus for equivalent testing of the thermal characteristics of a high-speed roller screw provided in an embodiment of the present invention.

[0024] Figure 3 A schematic diagram of the roller rotary table portion in the test apparatus for equivalent testing of the thermal characteristics of high-speed roller screws provided in an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the axial load application device in the test apparatus for equivalent testing of the thermal characteristics of high-speed roller screws provided in an embodiment of the present invention.

[0026] In the diagram: 1-Worktable, 2-Screw rotary table, 3-Roller rotary table, 4-Axial load application device, 5-Non-contact temperature sensor, 21-Fixed base, 22-First electric spindle, 23-First coupling, 24-First bearing housing, 25-Screw to be tested, 31-Slide rail, 32-Moving slide, 33-Second electric spindle, 34-Second coupling, 35-Second bearing housing, 36-Roller to be tested, 41-Screw, 42-Cage, 43-Spring, 44-Force sensor. Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0028] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0029] like Figure 1 The diagram illustrates an experimental apparatus for equivalent thermal characteristic testing of a high-speed roller screw, provided in one embodiment of the present invention. It is preferably suitable for testing high-speed roller screws with a peak speed of 20,000 RPM. The apparatus includes a worktable 1, on which a screw rotary table 2, a roller rotary table 3, and an axial load application device 4 are respectively mounted. The components of the entire apparatus are installed within the worktable 1. The roller rotary table 3 can be adjusted relative to the screw rotary table 2, thereby ensuring contact between the two threads of the roller rotary table 3 and the screw rotary table 2. The axial load application device 4 is connected to the roller rotary table 3 and is used to adjust the axial load. A non-contact temperature sensor 5 is also installed on the inner rear wall of the worktable 1 to collect temperature data in the contact area between the two threads of the roller rotary table 3 and the screw rotary table 2. Specifically, the non-contact temperature sensor 5 is installed on the inner surface of the rear plate of the worktable 1 for collecting temperature data.

[0030] likeFigure 1 As shown, in a preferred embodiment of the present invention, the lead screw rotary table 2, the roller rotary table 3 and the axial load application device 4 are arranged sequentially along the length of the worktable 1.

[0031] Preferably, the worktable 1 base is a rectangular platform, and the lead screw rotary table 2 is fixedly installed on the upper surface of the worktable 1 base; the roller rotary table 3 is movably installed on the worktable 1 base and can move linearly. By adjusting the position of the roller rotary table 3, the two thread teeth can be made in contact; the axial load application device 4 is also fixed on the worktable 1 base.

[0032] like Figure 2 As shown in the preferred embodiment of the present invention, the lead screw rotary table 2 includes a fixed base 21, a first electric spindle 22, a first coupling 23, a first bearing housing 24, and a lead screw 25 to be tested. The fixed base 21 is fixedly installed on the base of the worktable 1. The first electric spindle 22, the first coupling 23, and the lead screw 25 to be tested are coaxially connected on the fixed base 21 from left to right. The first bearing housing 24 is fixed on the fixed base 21 and is also rotatably connected to the lead screw 25 to be tested. The first bearing housing 24 can stably support the lead screw 25 to be tested. The first electric spindle 22 is a high-performance electric spindle. The first electric spindle 22 is used to control the forward and reverse rotation of the lead screw 25 to be tested and to control its rotation speed. That is, the high-performance first electric spindle 22 drives the first coupling 23 to rotate, thereby driving the lead screw 25 to be tested to rotate through the first coupling 23. Adjusting the direction and speed of the first electric spindle 22 can adjust the direction and speed of the lead screw 25 to be tested. In addition, the aforementioned fixed base 21, first electric spindle 22 and first bearing housing 24 can be installed and fixed with bolts, which will not be described in detail.

[0033] like Figure 3As shown, in a preferred embodiment of the present invention, the roller rotary table 3 includes a slide rail 31, a movable slide 32, a second electric spindle 33, a second coupling 34, a second bearing housing 35, and a roller to be tested 36. The slide rail 31 is mounted and fixed on the base of the worktable 1. Preferably, two slide rails 31 are provided. The movable slide 32 is slidably mounted on the slide rail 31 to realize the left and right movement of the roller rotary table 3. The second electric spindle 33, the second coupling 34, and the roller to be tested 36 are coaxially connected from right to left on the movable slide 32. The second bearing housing 35 is fixed on the movable slide 32. 5 is also rotatably connected to the roller 36 under test, and the roller 36 under test can be stably supported by the second bearing housing 35; the second electric spindle 33 is a high-performance electric spindle, which is used to control the forward and reverse rotation of the roller 36 under test and control its rotation speed. That is, the high-performance second electric spindle 33 drives the second coupling 34 to rotate, thereby driving the roller 36 under test to rotate through the second coupling 34. Adjusting the direction and speed of the second electric spindle 33 can adjust the direction and speed of the roller 36 under test; by adjusting the left and right position of the roller rotary table 3, the threaded contact between the lead screw 25 under test and the roller 36 under test can be achieved. In addition, the above-mentioned slide rail 31, second electric spindle 33 and second bearing housing 35 can be installed and fixed by bolts, which will not be described in detail.

[0034] Furthermore, the roller 36 to be tested and the lead screw 25 to be tested are arranged on the same axis.

[0035] like Figure 4 As shown, in a preferred embodiment of the present invention, the axial load loading device includes a lead screw 41, a retainer 42, a spring 43, and a force sensor 44. The retainer 42 is fixedly mounted on the base of the worktable 1. A lead screw 41 is threadedly connected to the retainer 42. The end of the lead screw 41 near the roller rotary table 3 is connected to the force sensor 44 via the spring 43. The force sensor 44 is also connected to the movable slide table 32. The axial load is applied through the lead screw 41. Rotating the lead screw 41 applies the force to the force sensor 44 at the moving end. The force gap is adjusted by the spring 43 to complete the loading and acquisition of the axial force.

[0036] like Figure 1 As shown, in a preferred embodiment of the present invention, the non-contact temperature sensor 5 corresponds to the lead screw 25 and the roller 36 to be tested, and the non-contact temperature sensor 5 is used to collect temperature data in the area between the lead screw 25 and the roller 36 to be tested.

[0037] The equivalent test process for the thermal properties of the roller 36 and the lead screw 25 under unidirectional or bidirectional high-speed rotation is as follows:

[0038] 1) Adjust the position of the roller rotating table 3, so that the measured roller 36 is in contact with the measured screw 25 thread (i.e. the measured roller 36 and the measured screw 25 axis is parallel, the thread surface is tangent);

[0039] 2) Turn on the non-contact temperature sensor 5, and collect the temperature data of the measured screw 25 and the measured roller 36;

[0040] 3) The first electric spindle 22 and the second electric spindle 33 are started at the same time, the output shaft of the high-performance first electric spindle 22 drives the measured screw 25 to rotate, the output shaft of the high-performance second electric spindle 33 drives the measured roller 36 to rotate, the rotating screw 41 applies force to the force sensor 44 at the moving end, and the force gap is adjusted by the spring 43, so as to complete the loading and collection of the axial force;

[0041] 4) By adjusting the output rotation speed of the high-performance first electric spindle 22 and the high-performance second electric spindle 33, the temperature data of the roller screw (i.e. the measured roller 36 and the measured screw 25) under different rotation speeds is obtained.

[0042] As a preferred embodiment of the present application, the maximum rotation speed of the measured roller 36 and the measured screw 25 in the one-way or two-way high-speed rotating roller screw thermal characteristic equivalent test is 20000RPM; the maximum axial loading force is 300N; and the maximum loading stroke is 500mm.

[0043] In addition, the control of each component can use the PLC controller disclosed in the prior art, and the specific model and circuit connection are not limited, and can be flexibly set in actual application. The circuits, electronic components and modules involved are all prior art, and those skilled in the art can realize them without further description, and the content protected by the present application does not involve improvement of software and method.

[0044] The above embodiment of the present application provides a high-speed roller screw thermal characteristic equivalent test device. The force is applied to the force sensor 44 through the screw 41 on the rotating axial load applying device 4, the visualization and convenience of the load are realized, the two high-performance electric spindles on the screw rotating table 2 and the roller rotating table 3 drive the screw and the roller to rotate respectively, the one-way or two-way high-speed rotation of the roller screw pair is realized, and the non-contact temperature sensor 5 can detect the temperature rise change during the roller and screw friction process in real time. The device has the advantages of simple structure, simple operation in loading process, intuitive and visual load size, adjustable stress gap, convenient temperature rise data collection, etc. The temperature rise between the screw and the roller contact surface can be directly detected, and the device has high testing efficiency and accuracy, and can solve the problem of difficult thermal characteristic test of the roller screw in one-way or two-way high-speed rotation, and provide experimental data for performance improvement of the roller screw pair.

[0045] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, as long as the combination of the technical features does not exist in contradiction, it shall be considered within the scope of the present disclosure.

[0046] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the patent scope of the present application. It shall be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these shall be within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A test device for high-speed roller screw thermal property equivalent testing, comprising a workbench, characterized in that, The inner side of the workbench is respectively provided with a screw rotating table, a roller rotating table and an axial load applying device; The roller rotating table can be positionally adjusted relative to the screw rotating table, so that the roller of the roller rotating table and the screw of the screw rotating table are in contact with each other; The axial load applying device is connected with the roller rotating table, and is used for adjusting the axial load; The inner wall of the rear side of the workbench is further provided with a non-contact temperature sensor for collecting temperature data of the contact area of the two threads; The screw rotating table comprises a fixed base, a first electric spindle, a first coupling, a first bearing box and a measured screw; The fixed base is fixedly installed on the base of the workbench, and the first electric spindle, the first coupling and the measured screw are coaxially and sequentially arranged on the fixed base from left to right; The first bearing box is fixed to the fixed base, and the first bearing box is further rotationally connected with the measured screw; The first electric spindle is used for controlling the forward and reverse rotation of the measured screw and controlling the rotation speed of the measured screw; The roller rotating table comprises a slide rail, a movable slide table, a second electric spindle, a second coupling, a second bearing box and a measured roller; The slide rail is fixedly installed on the base of the workbench, and the movable slide table is slidably installed on the slide rail; The second bearing box is fixed to the movable slide table, and the second bearing box is further rotationally connected with the measured roller; The second electric spindle is used for controlling the forward and reverse rotation of the measured roller and controlling the rotation speed of the measured roller.

2. Test rig for the thermal characteristic equivalent test of high-speed roller screws according to claim 1, characterized in that The screw rotating table, the roller rotating table and the axial load applying device are sequentially arranged along the length direction of the workbench.

3. Test rig for the thermal characteristic equivalent test of high-speed roller screws according to claim 2, characterized in that The screw rotating table is fixedly installed on the upper surface of the base of the workbench; The roller rotating table is movably installed on the base of the workbench; The axial load applying device is further fixed on the base of the workbench.

4. Test rig for the thermal characteristic equivalent test of high-speed roller screws according to claim 2 or 3, characterized in that The measured roller and the measured screw are coaxially arranged.

5. Test rig for the thermal characteristic equivalent test of high-speed roller screws according to claim 2 or 3, characterized in that The axial load applying device comprises a screw rod, a retainer, a spring and a force sensor; The retainer is fixedly installed on the base of the workbench, and the screw rod is threadedly connected to the retainer; the end of the screw rod close to the roller rotating table is connected with the force sensor through the spring, and the force sensor is further connected with the movable slide table.

6. Test rig for the thermal characteristic equivalent test of high-speed roller screws according to claim 5, characterized in that The non-contact temperature sensor corresponds to the measured screw and the measured roller, and is used for collecting temperature data of the area between the measured screw and the measured roller.

7. A test method for testing a test device for testing thermal characteristics of a high-speed roller screw as claimed in claim 6, characterized in that, The method comprises the following steps: Step 1, adjusting the position of the roller rotating table so that the measured roller is in contact with the measured screw; Step 2, starting the non-contact temperature sensor to collect temperature data of the measured screw and the measured roller; Step 3, simultaneously starting the first electric spindle and the second electric spindle, rotating the measured screw through the first electric spindle, rotating the measured roller through the second electric spindle, rotating the screw rod, applying force on the force sensor at the moving end through the spring, adjusting the stress gap through the spring, and completing the loading and collection of the axial force; Step 4, adjusting the output rotation speed of the first electric spindle and the second electric spindle to obtain temperature data of the roller screw under different rotation speeds.

8. The test method for testing the test device for high-speed roller screw thermal characteristic equivalence according to claim 7, characterized in that, The maximum rotating speed is 20000 RPM, the maximum axial loading force is 300 N, and the maximum loading stroke is 500 mm during the test of the thermal characteristic equivalent test of the tested roller and the tested screw.

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