熔炼铝合金常在电阻坩埚炉中进行。而一般的铸铁坩埚其形状、结构如图1所示。此种铸铁坩埚在熔炼铝合金时。其受高温加热的部位常在它的中、下部,再加上铝合金液的重力作用,因而在使用一段时期后,就慢慢形成如图2的鼓肚形状。此时,坩埚就不能再继续使用了,否则就有可能造成坩埚的破裂。经过我们的实践和观察,若对这种铸铁坩埚结构加以改进,就能延长它的使用寿命。具体改进措施为:(1)适当加厚坩埚圆弧底部的壁厚,一般可加厚8～15毫米;(2)增加四条竖加强筋和两条横加强筋。这样铸铁坩埚的强度就大大加强了。图3就是我们自 Melting aluminum alloy often in resistance crucible furnace. The general shape of the cast iron crucible, the structure shown in Figure 1. Such cast iron crucible in the melting of aluminum alloy. Its high temperature heating parts often in its middle and lower parts, coupled with the gravity of the aluminum alloy liquid, and thus use for a period of time, it slowly formed as shown in Figure 2 bulging shape. At this point, the crucible can no longer be used, otherwise it may cause the crucible rupture. After our practice and observation, if this cast iron crucible structure to be improved, we can extend its service life. Specific improvements are as follows: (1) Appropriate thickening of the bottom of the circular crucible wall thickness, generally thickening 8 ~ 15 mm; (2) increase the four vertical stiffeners and two horizontal stiffeners. This cast iron crucible greatly strengthened the strength. Figure 3 is our self