Dissertation
Dissertation > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Material testing machine and test equipment > Metal material testing machines and instruments

Development of a Contraposition Reciprocating Test Rig for Tribological Study and Friction & Wear Test

Author ZhuFeng
Tutor XuJiuJun
School Dalian Maritime University
Course Vehicle Operation Engineering
Keywords Test Rig for Tribological Study Cylinder Piston Ring
CLC TH871
Type Master's thesis
Year 2011
Downloads 184
Quotes 5
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Cylinder-Piston ring is one of the most important friction pairs in internal combustion engine, which determines the efficiency and reliability. With the voice of rising energy conservation, efficiency and reliability of the IC engine have been put on a higher demand. Therefore, studying Cylinder-Piston ring friction law and wear mechanism has great significance in reducing the power consumption, improving the efficiency and extending engine life.In this paper, a contraposition Reciprocating Test Rig for Tribological Study has been developed, by the principle of consistency of wear form-conditions. PVD piston ring, boron-phosphorus alloy cast iron cylinder and loose-hole coated chrome cylinder were chosen to be studied in different loads, speeds, temperatures on the friction coefficient and wear. The main conclusions are as follows:1) The contraposition reciprocating test rig can simulate the work conditions of cylinder-piston ring system, revolving speed can be adjusted smoothly at 0-500r/min, load stable during long running time, precise micro-adjustable oil.2) The friction coefficient of the two friction pairs did not change significantly with the increasing load, but the revolving speed and temperature decreased significantly. The friction coefficient of the pair of PVD piston ring-chrome cylinder is higher than the other pair; the wear of the alloy cast iron cylinder is higher.3) The wear mechanism of boron-phosphorus alloy cast iron cylinder is pearlitic adhesion at first, then the wear products become abrasive, the wear form changed into the mix-wear of adhesive and abrasive wear; the mechanism of chrome cylinder is fretting wear acted by stress.

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