High-speed friction testing method for spherical grinding head prepared ferrous metal friction pair

A spherical grinding head, ferrous metal technology, applied in the direction of testing wear resistance, etc., can solve problems such as difficulty in meeting high-speed friction test requirements, affecting test accuracy and accuracy, and changing the geometric shape of grinding tools, achieving high-speed friction testing, The effect of ensuring relative motion accuracy and increasing stability

Active Publication Date: 2016-06-08
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The existing test methods for high-speed friction have the following problems: ①The conditions for the friction pair to achieve the running-in process in the high-speed process are relatively harsh, and even the stable wear stage does not appear, and the severe wear stage is directly reached; ②The grinding tool wears seriously during the high-speed friction process , even after reaching the stable wear stage, the geometry of the grinding tool has changed significantly, which affects the accuracy and accuracy of the test; ③The huge inertial force generated by the high-speed rotation in high-speed friction seriously affects the accuracy of the friction test
Due to the limitations of the above problems, the maximum speed level of the existing commercial friction and wear testing machine is about 5000rpm (friction disc with a diameter of 50mm), and the linear speed is about 7.87m / s, which is difficult to meet the test requirements of high-speed friction

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  • High-speed friction testing method for spherical grinding head prepared ferrous metal friction pair
  • High-speed friction testing method for spherical grinding head prepared ferrous metal friction pair
  • High-speed friction testing method for spherical grinding head prepared ferrous metal friction pair

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Embodiment 1

[0034] A high-speed friction test method for pre-repairing ferrous metal friction pairs with a spherical grinding head, the device used includes:

[0035] For machine tools, the disc-shaped ferrous metal friction disc 1 is mounted on the electric spindle of the machine tool, and the friction disc 1 can be rotated by the electric spindle;

[0036] A dynamic balancer, used for online dynamic balancing of the friction disc 1;

[0037] The spherical grinding head 6 is used to repair the end surface of the friction disc 1; the spherical grinding head 6 is detachably attached to the bracket, and is movably attached to the machine tool through the bracket; the axis of the spherical grinding head 6 is parallel to the friction disc 1 axis of rotation;

[0038] The grinding tool is a friction ball or a friction pin, which is clamped on the fixture 4 connected with the force feedback device 5; the fixture 4 is detachably attached to the bracket, and is movably attached to the machine to...

Embodiment 2

[0050] 1) Fix the disc-shaped friction disc of 45 gear steel 42CrMoV (HRC50) with a diameter of 300mm on the electric spindle of the machine tool with a magnetic chuck or mechanical fixture, and the friction disc can be rotated by the electric spindle; Perform online dynamic balance to reduce the vibration of the friction disc during high-speed rotation, so as to ensure stable contact between the grinding tool and the friction disc during the scratching process;

[0051] 2) Use a spherical grinding head to repair the friction disc, first rough machining, and then finish machining, so as to form a circular ring on the surface of the friction disc with the runout of the end face better than IT1 grade and the average surface roughness Ra better than 10nm Repair the disc area to reduce the runout of the end face of the friction disc, improve the surface quality, and further ensure the stable contact between the grinding tool and the friction disc during the scratching process. The ...

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Abstract

The invention discloses a high-speed friction testing method for a spherical grinding head prepared ferrous metal friction pair, and belongs to the field of tribological testing and precision and ultraprecision machining. A ferrous metal friction disk is fixed to an electric spindle, and subjected to online dynamic balancing; then a spherical grinding head is adopted for finishing the friction disk, and the requirement of end face run-out and roughness needed for testing is met; then a friction tool is clamped on a clamp connected with a force feedback device, ball-disk tests, pin-disk tests and other friction tests are carried out, the friction disk rotates at the specified rotating speed, the friction tool and the friction disk are in contact, the pressure between the friction tool and the friction disk is fixed as a set testing value, testing is finished till the set time, and friction force, acoustic emission signals and other physical quantities are collected by a measuring system in the process. According to the high-speed friction testing method, high-speed friction testing can be achieved.

Description

technical field [0001] The invention belongs to the fields of tribological testing and precision and ultra-precision machining, and in particular relates to a high-speed friction testing method for pre-repairing ferrous metal friction pairs with a spherical grinding head. Background technique [0002] Friction and wear occur in high-speed rotating machinery, material cutting and reciprocating motion, etc. The friction coefficient and wear history are of great significance for the selection of parts materials, structural design, and cooling and lubrication methods. Among them, high-speed friction and wear have different characteristics from general friction and wear: ① The inertial force generated by high-speed (line speed greater than 15m / s) will affect the adhesion of lubricating oil, and the lubricating oil will be squeezed out or thrown out from the friction area, causing friction The coefficient increases; ②High-speed friction is accompanied by severe plastic deformation...

Claims

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Application Information

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IPC IPC(8): G01N3/56
CPCG01N3/56
Inventor 姜峰张涛言兰徐西鹏
Owner HUAQIAO UNIVERSITY
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