摘要
钢铁粉末温压技术的有效性不仅取决于粉末／模具加热温度、压制压力及润滑剂的特性，而且取决于所要生产的零件的特点，如几何形状。本文通过引入温压侧压系数（β）并运用唯象的温压压制方程着重分析了压坯高径比或高径差比对温压生坯密度的影响。理论分析表明，当β值超过某值时，温压生坯密度明显降低。不同β值的压坯温压实验表明，当β＝３～１０，温压生坯密度随粉末／模具温度变化有一最大值；而β≥２４时，无模壁润滑生坯密度随粉末温度升高而降低，而适当的模壁润滑却可保证得到６９０ＭＰａ下的７３８ｇ／ｃｍ３的高的温压生坯密度。
Effectiveness of warm compaction depends on compact geometry of PM parts,as well as powder/die temperature,compacting pressure and characteristics of lubricants used.An analysis of this effectiveness is given through warm compaction equation using a side pressing coefficient β relative to diameter high ratio of compacts.Both analysis and experimental data show that for β=3～10,green density has a maximum value and then decreases,as well for β>24,either green density decreases with increasing powder temperature without die wall lubrication leading to failure of warm compaction or green density continuously increases up to a higher value of 7.38g/cm 3 at 690MPa with appropriate die wall lubricant.
出处
《粉末冶金工业》
CAS
1998年第4期7-10,共4页
Powder Metallurgy Industry
