一、工艺概况半环(见图1)是液压支架液压系统中Z_c阀的一个零件,其材质为45钢,热处理技术要求HRC40～45。其工艺流程:车削—热处理—磨削—镀锌—耐压试验。热处理工艺是:820℃×2min油淬+400℃×20min回火。采用氯化铵镀锌,PH=6.8～7.2。最后经320大气压静载5min试验。二、失效分析开始生产半环时,在耐压试验中,有22%失效,产生断裂。1.断口分析半环经压力试验有22%的产生断裂现 First, the process overview Half ring (see Figure 1) is a hydraulic support hydraulic system Z_c valve a part of its material 45 steel, heat treatment technology requirements HRC40 ~ 45. The process: turning - heat treatment - grinding - galvanized - pressure test. Heat treatment process is: 820 ℃ × 2min oil quenching + 400 ℃ × 20min tempering. Ammonium chloride galvanized, PH = 6.8 ~ 7.2. Finally 320 atmospheres static load 5min test. Second, the failure analysis Half-ring production began, the pressure test, 22% failure, resulting in fracture. 1. Fracture analysis Half ring pressure test produces 22% of the fracture now