VISION3D Transportation & Heavy Industry Solutions

The draft sill and bolster assembly (known in the industry as "Qian-Zhen-Huan") is a critically stressed structural component of railway rolling stock with an extremely complex geometry. Structurally, it comprises the buffer beam assembly, bolster assembly, and draft sill assembly. Upon completion of manufacturing, more than 20 items—including dimensional accuracies and GD&T (Geometric Dimensioning and Tolerancing) parameters—must be inspected.

With the rapid advancement of high-speed rail, the trends toward higher speeds and heavier loads have imposed stricter requirements on operational safety. The manufacturing precision of critical components—including wheels, rails, and bearing saddles—dictates the safety and stability of train operations. Consequently, rigorous dimensional inspection is mandatory during both production and Maintenance, Repair, and Overhaul (MRO) processes.

High-speed rail (HSR) wheels are globally recognized as high-tech products with extreme manufacturing difficulty. These wheels are produced through die forging and rolling, involving multiple stages such as sawing, forging/rolling, heat treatment, and precision machining. Such complex forming processes pose a significant challenge to the stability of automated production lines. A critical objective is how to improve the yield rate while achieving precise control over machining allowances.