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The Shape Of The Pressure Material Surface Of Car Covers

                   The pressure material surface is a part of the process supplement, it is necessary to correctly determine the shape of the pressure material surface in addition of the process, so that the feed resistance of each part of the pressure material surface is even and reliable. To do this, it is necessary to ensure that the tensile depth is even, because only in the pressure material circle will stretch blank pressed on the concave molded surface, not to form wrinkles or creases, to ensure that the tensile parts do not wrinkle. In the determination of the pressure surface to minimize the depth of stretching, so that the shape of the Sui, but also must ensure that the expansion of the surface of the press is shorter than the length of the protruding die, the material can be stretched. If the expansion length of the press surface is longer than that of the convex die, it may form a ripple or wrinkle when stretched. If the pressure material surface is the flange part of the cover itself, then the concave die fillet radius is determined according to the specific situation, because the fillet radius of the covering piece is generally small, it is not easy to draw the fillet radius directly as the concave die, so it must be enlarged so as not to cause wrinkling or rupture. The rounded corners can be enlarged to meet the requirements of the product.

               The stamping direction of the part is the first problem to determine the tensile process, it not only determines whether to pull out the satisfactory tensile parts, but also affects how much the process complements and the shape of the pressure material surface. Reasonable determination of punching direction should meet the following 3 requirements.Car Covers

              (1) Ensure that the punch can enter the die. Concave die right below the shape outward protruding, the most protruding point exceeds the concave die size, so that the convex mode can not enter the concave die, this tensile direction is not stretched, must change the direction of stretching, so that the convex mode can enter the concave die. Rotate one angle in a clockwise direction. So that the convex chess can enter the concave die.Car Covers

              (2) The convex die contact blank area is large. The larger the contact surface, the smaller the angle between the contact surface and the horizontal surface. The harder the blanks are, the more difficult the local stress overload causes the parts to rupture. When the material is stretched, it is easy to obtain a complete convex die shape, which is helpful to improve the deformation degree of the part.

             (3) The feed resistance of each part of the pressure material surface should be uniform and reliable. The tensile depth uniformity is the main condition to ensure the uniform and reliable feeding resistance of each part of the pressure material surface. and the feeding resistance of each part of the pressure material surface is an important guarantee to ensure that the tensile parts are not wrinkled and not cracked.Car Covers


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