Device for measuring friction coefficient under the condition of material periodic deformation

Abstract

The invention disclosed a friction coefficient measuring device under the condition of material periodic deformation. The measuring device is mainly composed of a torque sensor, a sleeve system, an upper sample, a lower sample, a flexible fixture, an air bearing, a clamping system, a tension-compression sensor, a support rod, and a support table. A working module of a friction-wear testing machine is connected with the torque sensor and then connected with the sleeve system to fix the upper sample. A rotating module of the friction-wear testing machine is used for connecting the flexible fixture to fix the lower sample. The tension-compression sensor can accurately measure the radial force between the upper sample and the lower sample. The torque sensor can measure the load torque values of the upper sample and lower sample during testing. According to the curve of the load torque value and radial load value change between the upper sample and lower sample, the friction coefficient between the flexible bearing and flexible gear is obtained.

Claims

1. A device for measuring friction coefficient under the condition of material periodic deformation, comprising: a torque sensor (1) is connected to an upper working module of a friction and wear tester to measure a moving torque between an upper sample (3) and a lower sample (4); a sleeve system (2) is connected to the torque sensor (1) by bolts, and the upper sample is fixed by tightening the bolts on the sleeve system (2); a flexible fixture (5) is fixed on a friction and wear rotating module by bolts to fix the lower sample (4); a tension-compression sensor (8) is fixed on outside of the lower sample through a support rod and a support table to measure a radial forve between the lower sample and the upper sample (3); according to a curve of load torque value and radial load value change between the upper sample (3) and lower sample (4), a friction coefficient between the upper sample (3) and lower sample (4) can be obtained; a slope of the curve multiplied by a long diameter value of the upper sample is the friction coefficient between the upper sample (3) and the lower sample (4).

2. A device for measuring friction coefficient under the condition of material periodic deformation according to claim 1, wherein friction coefficient between materials under periodic deformation is measured by the friction and wear tester.

3. A device for measuring friction coefficient under the condition of material periodic deformation according to claim 1, wherein through centering function of an upper and a lower working modules of the friction and wear tester, coaxiality of a flexible wheel and a flexible bearing is ensured.

4. A device for measuring friction coefficient under the condition of material periodic deformation according to claim 1, wherein a size of the upper and lower samples is adjusted correspondingly according to sizes of flexspline and flexible bearing of a harmonic reducer in different specifications, test of friction coefficient between a flexible wheel of different harmonic reducer and a flexible bearing material is achieved.

5. A device for measuring friction coefficient under the condition of material periodic deformation according to claim 1, wherein the lower sample ensures that when a flexspline is deformed during the test, it prevents qualitative deformation and affects the coaxiality.

6. A device for measuring friction coefficient under the condition of material periodic deformation according to claim 1, wherein a radial load between the upper sample and the lower sample is measured by a tension-compression sensor.

7. A method for operating the device for measuring friction coefficient under the condition of material periodic deformation according to claim 1, comprising the following steps: S1. connect the torque sensor (1) to the upper working module of the friction and wear tester with bolts; S2. connect the sleeve system (2) to the torque sensor (1) by bolts; S3. fix the upper sample (3) on the sleeve system (2) by bolts; S4. the flexible fixture (5) is fixed on the rotating table of the friction and wear tester by bolts; S5. the lower sample (4) is fixed between the inner and outer linings of the flexible fixture (5); S6. the support rod (9) is connected to the support platform (10) with a nut; S7. the tension-compression sensor (8) is fixed on the support rod (9) through internal threads; S8. fix the air bearing (6) on the clamping system (7) with bolts; S9. the clamping system (7) is connected to the tension-compression sensor 8 through internal threads; S10. after all components and test pieces are fixed, start the friction and wear tester, move the upper part of the worktable to move sleeve system (2) and the upper sample (3) which connects with the torque sensor (1) downwards until it is inserted into the lower sample (4); at this time, the upper sample (3) supports and deforms the lower sample (4), and the outside of the lower sample (4) is in contact with the air bearing (6); operate the rotating table, the load torque value and the radial load value between the upper sample (3) and the lower sample (4) are meared by tension-compression sensor (8) and torque sensor (1) in real time; according to the curve of the load torque value and radial load value change between the upper sample (3) and lower sample (4), the friction coefficient between the upper sample (3) and lower sample (4) can be obtained; the slope of the curve multiplied by the long diameter value of the upper sample is the friction coefficient between the upper sample (3) and the lower sample (4).

Description

DESCRIPTION OF THE DRAWINGS

[0033] FIG. 1 is the general assembly drawing FIG. 2 is the sleeve system FIG. 3 shows the flexible fixture FIG. 4 is an exploded view of the flexible fixture FIG. 5 shows the force measuring device.

THE SPECIFIC IMPLEMENTATION

[0034] The invention uses the lower sample of the SHF25-80 type harmonic reducer as a prototype to illustrate the present invention, but the present invention is not limited to this.

[0035] The steps to use the device in the test are as follows:

[0036] Step 1: Connect the torque sensor 1 to the upper working module of the friction and wear tester.

[0037] Step 2: Connect the sleeve system 2 to the torque sensor 1 through bolts.

[0038] Step 3: Fix the upper sample 3 on the sleeve system 2 by bolts.

[0039] Step 4: Fix the flexible fixture 5 on the rotating table of the friction and wear tester by bolts.

[0040] Step 5: Fix the lower sample 4 between the inner and outer linings of the flexible fixture 5.

[0041] Step 6: Connect the support rod 9 to the support platform 10 with nuts.

[0042] Step 7: Fix the tension-compression sensor 8 on the support rod 9.

[0043] Step 8: Fix the air bearing 6 on the clamping system 7.

[0044] Step 9: Connect the clamping system 7 to the tension-compression sensor 8.

[0045] Step 10: Apply a layer of grease evenly on the inner wall of the lower sample material.

[0046] Step 11: start the friction and wear tester to move the upper part of the worktable, to move the sleeve system 2 and the upper sample 3 which connects to the torque sensor 1 downwards until it is inserted into the lower sample 4.

[0047] Step 12: Rotate the rotary table to obtain the radial load value and torque between the upper sample and the lower sample. According to the curve of the load torque value and radial load value change between the upper sample 3 and lower sample 4, the friction coefficient between the upper sample 3 and lower sample 4 can be obtained.

[0048] Step 13: After the experiment is over, move the upper sample up and out of the lower sample material.

[0049] Step 14: replace the sample and repeat the above steps if continuous test is need.

[0050] In summary, the testing device and testing method of the present invention can simply and effectively measure the required data, and can ensure the accuracy of the data.