Falling-off Resistant Material Selection and Design of Diesel Engine Valve Seats

doi:10.3969/j.issn.1000-1093.2015.10.001

Abstract

Abstract: The falling-off cause of exhaust valve seats in a strengthened diesel engine is analyzed in terms of material selection and design. Three materials, cobalt, nickel and powder based alloy, are tested on their strengths, thermal expansion properties, friction properties and volume stabilities. The assembly interference is considered through FEM simulation, and the engine test is carried out to validate the reliability of the new material valve seat. The results show that nickel-based alloy has the lowest friction property. The volume stability of powder-based alloy is lower than that of cobalt-based alloy. Cobalt- based alloy has the highest temperature compressive and friction properties, and presents a good ability to defend the abnormal operations. Moreover, with the increase in the material strength, the assembly interference could be enhanced to 0.081~0.113 mm, with a safe coefficient of 1.4 for both cylinder head and valve seats.

Key words: power machinery engineering, valve seat, high temperature compressive strength, assembly interference, safe coefficient

CLC Number:

TK425

WANG Xiao-song， ZHANG Wei-zheng, ZHANG Ti-en, GUO Bing-bin, ZHANG Chi. Falling-off Resistant Material Selection and Design of Diesel Engine Valve Seats[J]. Acta Armamentarii, 2015, 36(10): 1825-1831.

References

［1］张卫正，原彦鹏，郭良平，等. 高功率密度柴油机设计问题的仿真［J］. 兵工学报，2006，27(5)：775-778.
ZHANG Wei-zheng，YUAN Yan-peng，GUO Liang-ping，et al. Numerical simulation analysis of HPD diesel engine ［J］. Acta Armamentarii，2006，27(5)：775-778. (in Chinese)
［2］马彼嘉. 发动机缸盖气门座圈松动和掉出的原因［J］. 车用发动机，1997(5)：33-35.
MA Bi-jia. The cause of slackness and fall away of valve seat in cylinder head for engines ［J］. Vehicle Engine，1997(5)：33-35. (in Chinese)
［3］邵卫东，严彪，毛彭龄. 新型钴基高温合金的组织结构与力学性能［J］. 上海有色金属，2005，26(4)：160-163.
SHAO Wei-dong，YAN Biao，MAO Peng-ling. Structure and mechanical properties of newly developed co-based superalloys ［J］. Shanghai Nonferrous Metals，2005，26(4)：160-163. (in Chinese)
［4］王会安，安云岐，李承宇，等. 镍基高温合金材料的研究进展［J］. 材料导报，2011，25(18)：482-486.
WANG Hui-an，AN Yun-qi，LI Cheng-yu，et al. Research progress of Ni-based superalloys ［J］. Materials Review，2011，25(18)：482-486. (in Chinese)
［5］尹平玉，刘世民. 高合金、高性能粉末冶金气门座圈的研制［J］. 粉末冶金工业，2002，12(2):31-34.
YIN Ping-yu，LIU Shi-min. Research and manufacture of high alloyed valves seats in high quality ［J］. Powder Metallurgy Industry，2002，12(2):31-34. (in Chinese)
［6］ Ootani T，Yahata N，Fujiki A，et al. Impact wear characteristics of engine valve and valve seat insert materials at high temperature［J］. Wear，1995，188(1/2):175-184.
［7］朱远志，尹志民，曾渝，等. 重型发动机气门座圈工艺、材料研究进展［J］. 材料导报，2004，18(5):45-48.
ZHU Yuan-zhi，YIN Zhi-min，ZENG Yu，et al. An overview of material and process research of heavy duty engine ［J］. Materials Review，2004，18(5):45-48. (in Chinese)
［8］朱远志，尹志民，曾渝，等. 重型发动机气门座圈磨损机理与材料［J］. 内燃机工程，2004，25(4):78-82.
ZHU Yuan-zhi，YIN Zhi-min，ZENG Yu，et al. Material and wear mechanism of heavy duty engine valve seat ［J］. Chinese Internal Combustion Engine Engineering，2004，25(4):78-82. (in Chinese)
［9］赵维茂，张卫正，原彦鹏，等. 柴油机功率强化前后气缸盖的温度场模拟与试验［J］. 农业机械学报，2009，40(3):51-55.
ZHAO Wei-mao，ZHANG Wei-zheng，YUAN Yan-peng，et al. Simulation and experiment of temperature field on diesel engine cylinder head before and after enhancement of power ［J］. Transactions of the Chinese Society for Agricultural Machinery，2009，40(3): 51-55. (in Chinese)
［10］陈特銮. 内燃机热强度［M］. 北京：国防工业出版社, 1991.
CHEN Te-luan. Thermal strength of internal combustion engine［M］. Beijing: National Defense Industry Press, 1991. (in Chinese)

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