Car door frame edge binding process and mold

[0026] Example: A car door frame hemming die includes an upper mold and a lower mold. The upper mold is provided with a pressing plate 8 which matches the shape of the inner plate 1 after pressing. The edge of the pressing plate is provided with Punch 9, the head of the punch is matched with the folded edge of the outer plate 3, and a block 4 is provided on the edge of the punch. A slider 5 is provided on the inner plate side of the corresponding height of the lower die outer plate. The slider only It can move horizontally. The inner side of the block is curved, and the shape of the curved surface is consistent with the movement track of the slider. The slider is equipped with a tension spring. The tension spring makes the slider and the inner surface of the block always fit together. The block is driven to move downwards. An oil cylinder slider is provided on the side close to the guide rail. The end size of the oil cylinder slider is smaller than the vertical height of the guide rail. The oil cylinder slider is connected to the oil cylinder and is driven by the oil cylinder. The oil cylinder is equipped with a travel switch. There is a stroke limit block 6 on the mold, and the end of the stroke limit block is inclined. When the upper mold descends to a suitable position, the stroke limit block contacts the stroke switch on the oil cylinder, and there is a limit post 7 between the upper and lower molds. When the upper mold moves downward, the distance between the limit posts decreases until the upper and lower limit posts come into contact with each other, and the upper die stops descending (see Figure 6).

[0027] The process method includes the following steps: a. Place the stamped inner plate and guide rail according to the door structure, and perform spot welding at the contact position (see Figure 1); b. Place the assembled inner plate and guide rail in the folding In the outer frame of the edge (see Figure 2), align the position of the positioning hole and put it into the lower mold of the hemming; c. Start the pressure equipment to make the upper mold go down, and the pressure plate on the upper mold and the inner plate If the shapes are the same, press the inner plate of the weldment assembly along the guide column (see Figure 3); d. The upper mold continues to go down, and the block in the hemming mold pushes the slider to touch the part of the outer plate and the inner plate. The folding edge is bent into a 35°inwardly-inclined edge, and the travel switch controls the oil cylinder to push the slider to bend the outer plate of the contact part with the guide rail into a 35°inwardly-inclined edge (see Figure 4); e. Down, the slider is reset under the action of the tension spring before it interferes with the punch, and the slider pushed by the oil cylinder remains stationary; f. The upper mold is limited by the upper and lower limit posts when the upper die descends to the end, and the outer plate is inwardly inclined by 35°. The head is flattened, and when the pressure of the punch rises to a predetermined value of 200 MPa, the upper die with the punch rises and resets, and the hemming is completed (see Figure 5).