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为了防止铸钢件凝固过程中出现各种缺陷,尤其是缩孔、轴线缩松,保证铸件质量,必须对铸件凝固过程进行人为控制。铸钢件凝固可以归纳为两种方式,顺序凝固(又称方向性凝固)和同时凝固。根据铸钢件使用要求、材质和铸件结构情况确定了铸件采用何种凝固方式后,显然,冒口是控制凝固的重要措施。除此之外,还可以通过钢液引入型腔的方式、浇注工艺(浇注系统的形式、浇注温度、浇注速度、是否补浇等);利用“补贴”(铸件局部形状改变之增量或壁厚增厚量,有时
In order to prevent various defects during the solidification process of cast steel, especially shrinkage, axial shrinkage, to ensure the quality of castings, castings must be artificially controlled by the solidification process. Solidification cast steel can be summarized as two ways, the order of solidification (also known as directional solidification) and simultaneous solidification. According to the use requirements of steel castings, materials and the structure of the castings to determine what kind of solidification castings, it is clear that the riser is an important measure to control the solidification. In addition, the method of introducing molten steel into the cavity, the pouring process (the form of the pouring system, the pouring temperature, the pouring speed, the pouring rate, etc.); the use of “subsidy” Thicker thickening, sometimes