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活塞膜片组合件是用2C_r13钢棒材直接加工而成,淬火温度1020±10℃,回火温度170±10℃,使用强度160公斤/毫米~2。为了防锈,零件需经纯化处理,在纯化处理前要进行一道清除内孔氧化皮的准备工序,从一九七二年起由吹砂改为酸洗。成品在装配前需做耐压试验,在试验中加压后稳压4～5分钟个别零件出现断裂,每批约2～3件,断裂位置均在螺杆退刀槽与螺帽端面之间。为了解决这个问题,设计人员曾将螺杆加粗,但断裂现象仍然发生,为查明原因,我们进行了金相分析、热处理工艺试验和产品模拟试验。
Piston diaphragm assembly is processed directly with 2C_r13 steel bar, quenching temperature 1020 ± 10 ℃, tempering temperature 170 ± 10 ℃, the use of strength of 160 kg / mm ~ 2. In order to prevent rust, the parts to be purified, to be carried out in the purification process before the preparation of the inner hole oxide preparation, from blowing sand from 1972 to pickling. The finished product is to be tested for pressure resistance before assembly. After being pressurized, the pressure of the finished product is regulated for 4 to 5 minutes and the individual parts are broken. Each batch of about 2-3 pieces is in the position between the screw undercut and the nut face. In order to solve this problem, designers have screw thicker, but the fracture phenomenon still occurs, in order to find out the reasons, we conducted a metallographic analysis, heat treatment process and product simulation test.