转向架构架是客车产品的最大铸钢件。202.型构架长3560毫米,宽2090毫米,高390毫米,净重1吨,203型构架长4000毫米,宽2176毫米,高330毫米,净重1.26吨,轮廓尺寸大,结构复杂,技术条件要求高,侧梁及横梁的弯曲水平方向及垂直方向不超过6毫米,扭曲不超过6毫米,摇枕吊耳内部不允许有气孔缩孔等铸造缺陷存在。我厂长期生产以来,由于工艺沿用老的一套铸造 The bogie frame is the largest steel castings for passenger car products. 202. Type frame length 3560 mm, width 2090 mm, height 390 mm, net weight of 1 ton, 203-type frame length 4000 mm, width 2176 mm, height 330 mm, net weight 1.26 tons, the outline size, complex structure, high technical requirements , Side beams and beams bending horizontal and vertical direction of not more than 6 mm, no more than 6 mm distortion, bolster lugs do not allow porosity shrink holes and other casting defects exist. I plant long-term production, as the process of using a set of old casting