A device for super cryogenic forming of a metal thin-walled curved surface part, the device comprising a super cryogenic medium conveying and pressurizing unit, a press, a die unit and a control system, wherein the press comprises a blank holder cylinder, a blank holder slide, a deep drawing cylinder and a deep drawing slide that are disposed on the press;
- the blank holder cylinder is capable of driving the blank holder slide to move up and down vertically and the deep drawing cylinder is capable of driving the deep drawing slide to move up and down vertically;
- the die unit comprises a male die fixedly connected to a bottom end of the deep drawing slide, a blank holder fixedly connected to a bottom end of the blank holder slide, and a female die fixedly connected to a moving platform in the press, with the male die directly facing the female die and being coaxial with the blank holder;
- the super cryogenic medium conveying and pressurizing unit comprises an autoboosting cryogenic container;
- a cryogenic channel of the blank holder, a cryogenic channel of the female die and a cavity of the female die communicate with an outlet of the autoboosting cryogenic container by cryogenic pipes of the device, respectively;
- a cryogenic pump of the device is disposed on first ones of the cryogenic pipes between the cavity of the female die and the autoboosting cryogenic container;
- the female die and the blank holder comprise temperature sensors that are disposed in sidewalls of the female die and the blank holder, respectively;
- the female die comprises a pressure sensor that is disposed in the cavity of the female die;
- and the deep drawing cylinder, the blank holder cylinder, the autoboosting cryogenic container, the cryogenic pump, the temperature sensors and the pressure sensor are each electrically connected to the control system;
- wherein the autoboosting cryogenic container contains a super cryogenic medium, the control system is configured to control the cavity of the female die to be filled with the super cryogenic medium from the autoboosting cryogenic container, and the control system is configured to control the cryogenic pump to set pressure of the super cryogenic medium to a range of 0.8-30 MPa, so that any volume filling of the super cryogenic medium under pressure is realized, allowing for an increased cooling rate of a blank;
- wherein cryogenic valves which are electrically connected to the control system are disposed on second ones of the cryogenic pipes between the cryogenic channel in the blank holder and the autoboosting cryogenic container and the first ones of the cryogenic pipes between the cryogenic channel in the female die and the autoboosting cryogenic container, respectively;
- wherein the control system comprises a programmable logical controller (PLC), a signal input module, a communication module, a signal output module and a touch screen;
- the signal input module, the communication module, the signal output module and the touch screen are each electrically connected to the PLC;
- the press, the autoboosting cryogenic container, the cryogenic valves and the cryogenic pump are each electrically connected to the signal output module;
- displacement sensors are disposed on the blank holder cylinder and the deep drawing cylinder, respectively;
- the displacement sensors, the temperature sensors and the pressure sensor are each electrically connected to the signal input module;
- wherein the blank holder is configured to hold the blank in a position such that the super cryogenic medium directly cools the blank or the female die indirectly cools the blank to a set temperature ranging from −270° C. to −120° C.;
- wherein the control system is configured such that during cooling of the female die, opening of each cryogenic valve is adjusted by the control system in real time based on a temperature and the pressure of the super cryogenic medium at an outlet of the female die, as well as a female die temperature, so as to realize accurate control on the female die temperature;
- and to cool the female die to a temperature ranging from −270° C. to 0° C.