铝合金压铸件会产生硬质点 ,在机加工时导致刀具损坏及加工件表面产生缺陷 ,多年的实践和摸索 ,分析了常见的 4类硬质点产生的原因 ,并对合金成分的正确控制提出了建议。1　非金属性硬质点氧化物硬质点是在反射炉熔铝合金时 ,耐火砖与铝反应 ,形成氧化物及无机化合物 ,其所含的 Aluminum alloy die-casting parts will produce hard points, resulting in machining damage to the workpiece and the workpiece surface defects, many years of practice and exploration, analysis of the common causes of the four types of hard points, and the correct control of alloy composition give suggestions. 1 hard point of hard metal oxide hard point is refractor furnace melting aluminum alloy, refractory brick and aluminum reaction to form oxides and inorganic compounds, which contains