Spherical contact type friction characteristic testing device under ultrasonic vibration

A technology of spherical contact and friction characteristics, applied in the direction of measuring devices, testing wear resistance, using mechanical devices, etc., can solve problems such as inability to study friction and wear characteristics, and achieve a high degree of automation

Inactive Publication Date: 2013-09-04
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the existing friction and wear testing machines can cond

Method used

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  • Spherical contact type friction characteristic testing device under ultrasonic vibration
  • Spherical contact type friction characteristic testing device under ultrasonic vibration
  • Spherical contact type friction characteristic testing device under ultrasonic vibration

Examples

Experimental program
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no. 1 example

[0026] Refer to Figure 1 to Figure 5 As shown, this embodiment is composed of a main movement unit, a loading unit and a force measuring unit;

[0027] The main motion unit includes a base 1, a DC motor bracket 11, a DC motor 10, and a lower sample mounting table 9. The bottom surface of the base 1 is equipped with four cylindrical shock-absorbing rubbers 12 with the same structure. The DC motor bracket 11 uses The bolts are fixed on the base 1, the DC motor 10 is fixedly installed on the DC motor support 11 through the through holes on the flange surface, and the lower sample mounting table 9 is connected with the output shaft of the DC motor. Refer to Figure 5 As shown, the lower sample mounting table 9 is composed of a rotating table 29, a pressure block 30, a spring washer 31, and a nut 32. The bottom end of the rotating table 29 is provided with a hole and a keyway, and the output shaft of the DC motor 10 is connected through the hole and the keyway. Connect, and screw in...

no. 2 example

[0035] Refer to Image 6 versus Figure 7 As shown, the structure of the second embodiment is basically the same as that of the first embodiment. The difference is that the piezoelectric ultrasonic transducer holder 5 connected to the three-axis force sensor 4 is a straight-plate structure, and the piezoelectric ultrasonic transducer 6 Mounted horizontally on the piezoelectric ultrasonic transducer holder 5, the upper sample 8 is mounted on the front of the piezoelectric ultrasonic transducer 6, and the front of the front cover 27 of the piezoelectric ultrasonic transducer 6 is milled into a flat structure up and down. , The lower flat surface is machined with an inner cone with a Morse taper, which is in interference fit with the outer cone on the rear end of the upper sample 7, that is, the axis of the upper sample 7 is perpendicular to the axis of the piezoelectric ultrasonic transducer 6. When the piezoelectric ultrasonic transducer 6 is connected to an ultrasonic power sour...

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Abstract

The invention discloses a spherical contact type friction characteristic testing device under ultrasonic vibration. The device consists of a main movement unit, a loading unit and a dynamometer unit, wherein the torque output by a step motor is converted into axial pressure of a sliding table through a lead screw nut pair of a trapezoidal screw, and an upper sample and a lower sample which are arranged at the bottom of a piezoelectric micromachined ultrasonic transducer are contacted with each other, and certain pressure is applied to the lower sample; when the piezoelectric micromachined ultrasonic transducer is connected with an ultrasonic power supply, the upper sample produces ultrasonic frequency vibration with micron-grade amplitude in the horizontal direction or the vertical direction, the lower sample rotates together with a rotating platform and forms a friction pair with the upper sample, so that the friction characteristic of the spherical contact under ultrasonic vibration can be tested. The device can be used for accurately controlling the testing parameters, is high in degree of automation, and can be used for performing spherical contact friction experiments of various types of friction materials under different ultrasonic vibration frequencies and vibration amplitudes.

Description

Technical field [0001] The invention relates to a friction and wear testing machine, in particular to a spherical contact type friction characteristic testing device under ultrasonic vibration. Background technique [0002] The friction between objects is affected by many factors, such as: the roughness of the friction surface, sliding speed, material properties, normal force, stick-slip characteristics, ambient temperature and relative humidity, lubrication and vibration. Among them, the method of using vibrations of different frequencies and amplitudes to affect friction has been widely used in many fields. As early as 1959, American scholar Fridman et al. studied the effect of vertical vibration on the coefficient of static friction. It was found that as the amplitude increased, the static friction coefficient gradually decreased until it dropped to zero, and finally appeared a negative value. Later, Godfrey used the designed experimental device to study the effect of vertic...

Claims

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Application Information

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IPC IPC(8): G01N3/56G01N19/02
Inventor 董景石王良亮傅成杰王成川薛江鹏狄雷方盛洲蔡浩
Owner JILIN UNIV
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