论文部分内容阅读
针对变速箱箱体的结构及其成形工艺进行了分析,制定了间接挤压铸造工艺方案。在用立式挤压铸造机SCV-2000生产的铸件上发现冷夹层和缩孔、缩松缺陷。经过模具优化设计,采用带有集渣腔的浇口套和局部加强型芯,消除了内浇口附近箱壁上的冷夹层和缩孔、缩松等缺陷。微观组织和力学性能检测得知,其抗拉强度为317 MPa,伸长率为6.1%,硬度(HBS)为99,满足使用要求。X射线探伤结果表明,铸件组织致密,无气孔、缩孔、缩松等缺陷。
According to the structure of the gearbox and its forming process, an indirect extrusion casting process scheme has been established. Cold mezzanine and shrinkage defects were found on the castings produced by the vertical extrusion casting machine SCV-2000. After the mold optimization design, with a set of slag chamber cavity sprue and local strengthening core, eliminating the inner gate near the cold box on the mezzanine and shrinkage, shrinkage and other defects. Microstructure and mechanical properties of the test revealed that the tensile strength of 317 MPa, 6.1% elongation, hardness (HBS) of 99, to meet the requirements. X-ray inspection results show that the castings are dense, no porosity, shrinkage, shrinkage and other defects.