Sample forming device for stress corrosion U-shaped bending test

The utility model relates to a sample forming device for a stress corrosion U-shaped bending test. The sample forming device comprises a U-shaped pneumatic press and a pressure increasing valve, the U-shaped pneumatic press comprises a rack, a mold, a bulletproof air cylinder and a sample pressing air cylinder; the mold comprises a lower mold and an upper mold, and the sample pressing air cylinder is fixedly arranged on the rack, is in driving connection with the upper mold and drives the upper mold to ascend or descend in the vertical direction; when the upper die descends, the upper die presses a sample and bends and forms the sample; and the pressure increasing valve is respectively communicated with the bulletproof air cylinder and the sample pressing air cylinder through pipelines. Through the arrangement of the bulletproof air cylinder and the sample pressing air cylinder and the use of the pressure increasing valve, on the premise of ensuring the test accuracy, the effective combination of machinery an