尼龙锁紧套冲击荷载测试工装优化设计

尼龙锁紧套是地铁用双层非线性减振扣件的零件之一，其将上下铁垫板及中间减振垫锁定成为一体，实现扣件预组装，进而大大减少现场施工工作量。根据技术要求，尼龙锁紧套完成加工后，应进行冲击韧性试验，要求能承受50 kg锤头从45 mm高度自由落体冲击6次而不损坏。根据尼龙锁紧套技术条件，设计了冲击试验工装，借助有限元软件对结构进行了冲击计算。根据计算结果对结构进行了进一步优化，最终得到满足冲击试验强度的优化后结构，并且重量从原来的15.87 kg减少至8.17 kg，方便该冲击试验的反复拆装操作。根据优化后图纸加工了相应冲击工装，并进行了冲击试验，结果显示，该工装满足冲击试验要求。

Optimization Design of Impact Load Testing Tool for Nylon Locking Sleeve

As one part of double-layer non-linear vibration damping fastener, nylon locking sleeve can realize the pre-assembly of the fasteners by locking the upper and lower iron plates and the middle damping pad into one body, thereby greatly reducing the workload of on-site construction. According to the technical requirements, impact test should be carried out on the nylon locking sleeve after being manufactured. No damage should be left in the sleeve when it bears 6 shocks of 50 kg hammer falling freely form a height of 45 mm. In this paper, impact test tooling based on the technical requirements of nylon locking sleeve is designed, and the impulse response of the tooling computed by ANSYS. The structure is further optimized according to the calculation results, and the optimized structure can meet the strength requirements. The weight falls from 15.87 kg to 8.17 kg, which is convenient for the disassembly and assembly operations. The optimized impact tooling can meet the requirements of impact test.