The tensile part of the car tensile part of the technical determine the key
1, stamping direction to determine the direction of the punching direction of the part is to determine the stretching technology first encountered the question of whether it can not only decide to stretch out the pieces of satisfaction, and also affect the technology to make up for some of the number and binder surface shape . Reasonable concluded that the direction should be satisfied with the following three aspects of the demand. (1) to ensure that the punch can enter the die. As shown in Figure 1a, the shape of the lower right side of the die convex outward, the most prominent point beyond the concave die size, so that the punch can not enter the die, the stretching direction can not be stretched, it is necessary to change Stretching direction, so that the punch can enter the die. As shown in Figure 1b, Figure 1a is rotated in the clockwise direction by one viewpoint. So that the convex chess can enter the die. (2) to punch the rough touch area. The larger the touch surface, the smaller the angle between the touch surface and the horizontal plane. The more rough the less the occurrence of some stress overload parts Ershi break. The data in the stretch function of the progress of the mold, easy to get intact punch shape, is conducive to improving the degree of deformation of parts. (3) Binder surface of some of the feed resistance to uniform solid. Uniform depth of stretch is to ensure that some of the feed surface of the feed resistance of the uniform and reliable primary conditions. The binder surface of some feed resistance is uniform to ensure that the tensile part is not wrinkled, not to ensure the importance of cracking. 2, a reasonable addition of technology to make up for the circle divided into the stretch, often in the parts on the basis of adding some technology to make up, and then reach the satisfactory tensile effect. Technology to make good or bad drawing parts is an important symbol of the level of description, reasonable added technology to make up some of the following three aspects should be satisfied with the needs: (1) the process of stretching needs. (2) the needs of the binder surface. (3) the need for trimming and flanging after stretching.