Friction test device and test method thereof

Abstract

The invention discloses a friction test device. The friction test device comprises a fixed base; a resistance spring is hinged at one side of the fixed base; a pressure rod is hinged on the top of theresistance spring; the tail end of the pressure rod is hinged with the fixed base; the pressure rod is connected to a test-piece frame; the test-piece frame is connected with the fixed base; a friction disk is arranged below the test-piece frame; the friction disk is connected with a motor and a torque sensor positioned on the fixed base through a bearing base; a vertical force sensor is arrangedbetween the pressure rod and the test-piece frame; and a horizontal force sensor is arranged on the test-piece frame at two ends. A friction test method disclosed by the invention comprises the stepsof: (a), initializing the horizontal force sensor; (b), adjusting the length of the resistance spring, so that the vertical force sensor generates positive pressure set to FN; (c), beginning to test;and (d), obtaining the friction force Fa and Fb, and the friction coefficient f=(Fa+Fb) / FN by the horizontal force sensor, and obtaining the test-piece deformation frequency. By means of the frictiontest device and the test method thereof provided by the invention, the friction force and abrasion detection result of greatly deformed rubber is accurate; and the measurement precision is high.

Description

technical field [0001] The invention relates to the technical field of friction and wear and friction noise tests, in particular to a friction test device and a test method thereof. Background technique [0002] The wear of parts directly affects the service life of the equipment, and the friction noise pollutes the environment. For example, in the rubber-metal friction pair, due to the large deformation of the rubber, the friction pair is prone to vibration and harsh noise, etc. In-depth research on the wear and deformation mechanism of the large-deformation friction pair can reduce the wear and tear of the friction pair as much as possible. Reducing the friction pair noise is an urgent problem to be solved in engineering applications. [0003] In order to obtain the influence of the friction coefficient and pressure change frequency on the friction pair, the existing method uses a rotating hinge point to make the workpiece contact with the friction disc in a circumscribed...

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Problems solved by technology

[0003] In order to obtain the influence of the friction coefficient and pressure change frequency on the friction pair, the existing method uses a rotating hinge point to make the workpiece contact with the friction disc in a circumscribed manner. The loading method is to hang a heavy object with a fixed weight. When the specimen wears , because the distance from the rotating hinge point to the center of the friction disc is constant, and the wear of the test piece will cause the loading rod to have a large rotation angle, that is, the circumscribed contact will cause a large change in the contact position, which cannot be measured normally. Due to the elastic deformation-recovery of the friction pair, the heavy object loses weight instantaneously, so the real positive pressure cannot be represented, which affects the measurement accuracy of the friction force and the relative deformation frequency of the friction pair; and the installation of the test piece in the existing method is limited, which is easy to cause Improper installation of the test piece affects the test, and the direction of the tangential friction force is likely to change during the test process, which increases the test error; the existing method cannot guarantee that the loaded force is correctly represented on the measurement surface, that is, the loading force of the same weight It changes with the generation of wear; the installation of the sensor in the existing way is difficult, and the normal direction of the obtained force is inconsistent, which affects the measurement accuracy

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