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绞肉机壳体系精密铸造件,生产以来不良品率较高,其中裂纹缺陷尤为严重,不良品率40～80％,甚至90％。因此我们运用质量管理的方法,找到了壳体裂纹产生的原因,经生产考验,裂纹发生率降到目标值10％以下。一、首先判断裂纹的性质裂纹发生于头部与杆体左右两侧,断口及金相检查表明裂纹为热裂;清壳时振动机压力过大,往往使热裂纹扩展。二、热裂产生的原因: 在生产的绞肉机十二种精铸件中,除壳体外,其余十一
Meat grinder shell casting system parts, since the production of a higher rate of defective products, including crack defects are particularly serious, defective rate of 40 to 80%, or even 90%. Therefore, we use the method of quality management to find out the cause of the crack in the shell. After the production test, the crack incidence rate drops below 10% of the target value. First, determine the nature of the crack Crack occurred in the head and left and right sides of the rod body, fracture and metallographic examination showed that the crack is hot cracking; Qing shell when the vibrator pressure is too large, often to hot crack propagation. Second, the cause of hot cracking: In the production of meat grinder twelve kinds of casting, in addition to the shell, the remaining eleven