铸件

铸造铝合试棒拉伸时,如何确定试棒直径?

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如题 铸铝合金试棒一般为铸造,特别是沙型铸造,如何确定尺寸
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表面加工一下,纯铸造表面测量误差很大,如果不加工就只有测量三处,每处测量两次(两次互相垂直)取下半场值,以三处最小的平均值来计算。
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