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一、问题的提出: 根据生产发展的需要,我厂须生产重达38Kg的精铸阀体,因此提出了型壳实际强度计算问题,即确定保证铸件成形的最小型壳厚度。型壳强度直接与构成型壳的耐火材料,粘结剂,硬化剂及具体工艺参数有关外,还与铸件材质铸件形状、浇注系统有关。在没有高温型壳强度等试验设备的情况下,我厂采用了型壳强度试验法解决了型壳强度定量计算问题。对浇注系统相似的型壳,依次减少型壳层数,找出型壳的临界层数及型壳破坏位置,再根据型壳的破坏情况,进行受力分析,确定出型壳是拉力破坏(胀坏)或弯曲破坏,进而计算与我厂相应工艺,相应浇注系统的型壳临界强度бb。利用这个型壳临界强度
First, the issue put forward: According to the needs of production development, our factory must produce cast-body valve weighing 38Kg, so the calculation of the actual strength of the shell, that is, to determine the minimum shell thickness to ensure the formation of castings. The shell strength is directly related to the refractories, binders, hardeners and specific process parameters of the constituent shell, but also relates to the casting shape and casting system of the casting material. In the absence of high temperature shell strength and other test equipment, I plant the use of shell strength test method to solve the problem of quantitative calculation of shell strength. For the similar casings of pouring system, the number of shell layers is reduced in order to find the critical layer number of the shell shell and the destruction position of the shell shell. Based on the damage of the shell shell, stress analysis is conducted to determine if the shell shell is damaged by tension Bulging bad) or bending damage, and then calculate the corresponding process with my plant, the corresponding casting system, the critical strength of the shell бb бb. Use this shell for critical strength