论述了温挤压成形时存在模具磨损与挤出齿轮件头部凸的问题，分析了其产生的原因与造成的后果。
The existing questions of mould wear and the protruding head of spur gear during the warm extrusion are discussed and the reason and aftereffect are analyzed.
对锤片式粉碎机锤片磨损机理，锤片磨损形式与规律，锤片磨损量分布及锤片磨损引起的后果进行了较全面的分析。
The paper have a more comprehensive analysis for the hammer wear mechanism and wear mechanism and the hammer wear form and distribution of hammer wear and caused by the consequences of hammer wear.
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