Development And Test Research Of New Modern Car Aluminium Alloy Piston

Piston subassembly is one important part of internal-combustion engine which operation has direct effect on the performance, reliability and emission capability of internal-combustion engine index. Most of all, the reasonable design plays a key role in engine development as customers and the society have stricter requirements on internal-combustion engine performance and there is more urgency to get our products onto the market.This subject base on engine piston study condition both at home and abroad has made up a design method for a more perfect and efficient set of piston subassembly taking the example of the design development and test study of engine piston 83a of one high performance car. The design and analysis flow according to the subject sum-up have efficiently improved engine mechanical efficiency and the performance parameter of engine oil consumption and blow-by have reached design target under the guarantee of piston high temperature resistance, thermal stabilization and piston reliability.The main task of this subject:We have summed up basic design rule of the whole aluminum alloy piston, put forward the design method of piston subassembly integration, designed and established three-dimensional value model make use of Unigraphics software, accomplished grid division of piston subassembly and numerical simulation calculation utilized Ansys software. Structure reliability in structure strength of this car piston has been ensured through the stimulation calculation of temperature field, stress field and safety factor of the piston subassembly.We have established GLIDE stimulation analysis for cylinder-kit based on piston dynamics and ring carrier dynamics; set up mathematical model of piston dynamics according to engine oil consumption, gas streaming and friction equation function utilized GLIDE dynamics stimulation analysis software. At the same time, we had the comparison analysis of piston skirt profile, studied the effect of various parameters on engine dynamic performance, oil consumption and noise and so on index. The change rule of crank corner according to engine exploding pressure is measured by engine bench test, piston surface temperature has been measured by hardness plug method, and scuff test, joint test, performance test and reliability test of engine piston have also been carried out. The test result suggests that fit parameters of piston subassembly provided according to this subject have meet the engine expected design objective. The success rate of piston subassembly development has improved efficiently through the stimulation and optimization of cylinder kits.Through the study of this subject, the success rate of product development have improved under the guarantee of piston working reliability, large development expense brought by test has been lowered which also provides experience for design and development of other new products.