车钩在车辆上使用批量较大,零件相互组装间隙较小,要求不经加工即能达到互换(便于组装、检修)和良好的三态作用(车钩连挂之三种状态:闭锁、开锁、全开),故对铸件尺寸精度要求较高。目前,车钩芯的生产方法是采用合脂砂或水玻璃砂,分上、下两爿,在震实造型机上制 Coupling the use of large quantities of vehicles on the vehicle, the smaller parts of each assembly gap, requiring processing can be achieved without interchanging (easy assembly and maintenance) and a good three-state effect (coupler linked to the three states: lock, unlock, Fully open), so the casting dimensional accuracy requirements are higher. At present, the coupler core production method is the use of synthetic sand or sodium silicate sand, points up and down the next two 爿, in shock real molding machine system