Some metallic parts are successfully fabricated using a vacuum pressure difference casting technology and a casting mould shell technology.
通过采用真空压差铸造工艺，结合铸造型壳的制造，成功制造出金属零件。
So it is better to use the alloy steel roller shell in the technology of high-speed electromagnetic roll casting in terms of utilizing magnetic field.
从磁场利用的角度考虑，在电磁场快速铸轧技术中使用合金钢辊套比使用新型材料辊套更好。
In the paper, based on the Propotional Solidification Theory and Large Orifice Discharge Theory, the foundry technology of gray iron casting shell was designed by the method of CAD.
论文根据均衡凝固及大孔出流理论，用计算机辅助设计的方法改进了壳体灰铸铁件的铸造工艺。
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