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The key to the front fender process design is the selection of the press and the determination of the stamping process and direction. The following two problems are analyzed. Selection of presses At present, in order to improve labor productivity, all the covers and large pieces must be produced on the automatic line. The existing automatic lines are 6000kN and 10000kN. The front fender material grade is ZSTE180BH_ZE75/75, and the material thickness is 0.7mm. According to the material thickness of the part and the tensile boundary condition of the part and the simulation test of the tensile process, the first tensile force is about 5000kN, and the 6000kN automatic line/ The nominal pressure of the outer slide is 8000kN/6000kN, so the 6000kN automatic line is selected to produce the front fender. There are 6 presses for the 6000kN automatic line. The first one is a double-action stretching press, and the other five are single-action presses. 1. Double action press 2. Single action press 3. Flip the car 4. Shuttle car 5. Upper and lower machine manipulators.
The stamping process and the direction of the punching direction are closely related to the coordinate position and formability of the stamping part in the mold. The reasonable punching direction should ensure that the drawing punch can smoothly enter the die, and there is no die contact. Area. The air-cushion on the double-action stretching press in the 6000kN production line is divided into inner and outer slides, and the parts must be reverse-stretched to form smoothly. Therefore, the stamping process and punching direction of the front fender of the Santana 2000 sedan can be determined as follows: Blanking; step 2 is reverse-stretching, double-stretching ribs are used on the side where the material flow is small, and the trolley 180b is reversed, and the punching direction is performed; the step 3 is pre-cut, the punching direction is opposite to the step 2; the step 4 is formed and precise The step 5 is formed on the basis of the step 4; the step 6 is folded and the final cut is performed; the step 7 is finally formed, and the stretch forming direction of the step 7 (in view of the dead angle) is rotated by 12.5 b with respect to the step 3.
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