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High-speed friction testing method of diamond knife pre-maintenance nonferrous metal friction pair

A technology of diamond tools and non-ferrous metals, which is applied in the direction of testing wear resistance, preparation of test samples, and measuring devices, etc. It can solve the difficulties in meeting high-speed friction test requirements, affecting test accuracy and accuracy, and changing the geometric shape of grinding tools, etc. problems, to achieve the effect of ensuring relative motion accuracy, ensuring precision and accuracy, and high-speed friction testing

Active Publication Date: 2016-06-01
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • High-speed friction testing method of diamond knife pre-maintenance nonferrous metal friction pair
  • High-speed friction testing method of diamond knife pre-maintenance nonferrous metal friction pair
  • High-speed friction testing method of diamond knife pre-maintenance nonferrous metal friction pair

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Embodiment 1

[0032] A high-speed friction test method for pre-repairing non-ferrous metal friction pairs with diamond tools, the device used includes:

[0033] In the machine tool, the disc-shaped non-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;

[0034] A dynamic balancer, used for online dynamic balancing of the friction disc 1;

[0035] The diamond single-point tool is a diamond turning tool 6, specifically a polycrystalline diamond (PCD) single-point turning tool and a single crystal diamond (ND) single-point turning tool, which are used to repair the end face of the friction disc 1; the diamond turning tool 6. It is detachably attached to the bracket, and is movably attached to the machine tool through the bracket;

[0036] 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 detachab...

Embodiment 2

[0047] 1) Fix the oxygen-free copper disc-shaped friction disc with a diameter of 400mm on the electric spindle of the machine tool with screws and other mechanical fixtures. To reduce the vibration of the friction disc during high-speed rotation, so as to ensure the stable contact between the grinding tool and the friction disc during the scratching process;

[0048] 2) Use diamond turning tool to repair the friction disc, first use polycrystalline diamond single-point turning tool to repair the disc, and then use single-crystal diamond single-point turning tool to repair the disc, the runout of the end face formed on the surface of the friction disc is better than IT1 grade , the average surface roughness Ra is better than 5nm in the ring-shaped disc repairing area to reduce the runout of the end face of the friction disc, improve the surface quality, and further ensure that the grinding tool and the friction disc can be in stable contact during the scratching process. The sp...

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Abstract

The invention discloses a high-speed friction testing method of a diamond knife pre-maintenance nonferrous metal friction pair and belongs to the field of tribological testing and precise and ultra-precise machining. The high-speed friction testing method includes: fixing a nonferrous metal friction disc on an electric spindle, and performing online dynamic balancing on the friction disc; adopting a diamond knife to maintain the friction disc to reach requirements needed for testing end face jumping and coarseness; clamping a pair friction tool on a clamp connected with a force feedback device, conducting friction testing like ball-disc testing and pin-disc testing, enabling the friction disc to rotate at a specified rotating speed, enabling the pair friction tool to contact with the friction disc, maintaining pressure between the pair friction tool and the friction disc at a testing set value for testing until setting time is up, and collecting physical parameters like friction force and sound emitting signal in the process by a measuring system. By using the high-speed friction testing method, high-speed friction testing can be realized.

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 non-ferrous metal friction pairs with diamond tools. 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 of the ...

Claims

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Application Information

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IPC IPC(8): G01N3/56G01N19/02G01N1/28
CPCG01N1/286G01N3/56G01N19/02
Inventor 姜峰张涛言兰徐西鹏
Owner HUAQIAO UNIVERSITY
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