It is concluded that the process parameters of the DNlOOmm stop valve body made of 20 steel by shear extrusion are: the heating temperature of the blank test piece is 1200 ℃, and the die is preheated at 100~300 "C. Graphite water agent is used as the lubricant. The punch is conical, and the punch diameter is~108mm. The test piece is a blank with flange. The test equipment is lO00t clutch screw press, and its relevant working parameters are shown in Table l. The mechanical properties under forging are as follows. A set of dies was designed according to the working parameters of the press and the technological characteristics of the shear extrusion of the specimen. Before the test, the required extrusion force shall be calculated according to the simulation test results, the actual forging size and the mechanical properties of the forging materials. The calculation shows that the 1O00t press can meet the requirements of the lip shape.

Common faults of pneumatic butterfly valve and solutions! Test and adjustment of pneumatic butterfly valve
1. The manual, pneumatic, hydraulic and electric parts of butterfly valve have been strictly debugged before leaving the factory. When rechecking the sealing performance, the user should evenly fix both sides of the inlet and outlet, close the butterfly valve, apply pressure to the inlet side, and observe whether there is leakage at the outlet side. Before the strength test of the pipeline, the disc should be opened to prevent damage to the sealing pair.
2. Although the pneumatic butterfly valve has been strictly inspected and tested before delivery, some products have automatic screw displacement during transportation, which requires readjustment, pneumatic, hydraulic, etc. Please read the operating instructions of the supporting drive device.
3. The electric drive butterfly valve has adjusted the opening and closing travel of the control mechanism before delivery. In order to prevent the power supply from being connected in the wrong direction, after the first power supply is connected, the user should first turn on the manual switch to the half open position, and then press the electric switch to check that the direction of the indicator plate is consistent with the closing direction of the valve.