Due to the process content of the special-shaped spring, in addition to flanging, the curved surface is narrow, and the parts are particularly cluttered, as well as the shape forming content, so the forming requires the core of the die pressing material to be consistent with the forming surface, which will result in the mold structure. Small area. Designers will consider the characteristics of special-shaped springs, but ignore the forming guide sliding stroke of the binder core, but there are often some disadvantages:
1. The pressing material core is a complex profile surface, which is formed by casting, and then the guide surface is machined. After forming the machined surface and the guide surface of the die, there is a gap error. During the normal operation of the mold, the left/right side of the pressing material core appears. swing.
2. The guide length of the pressing material core is designed to be 125 mm, and the actual guiding length is 100 mm. Although it is within the planned range, there is some lifting of 110 mm, and the movement exceeds the effective guide length of 9 mm, and the holding of the pressing material core is unstable. The disadvantages of workpiece positioning prohibition.
3. The special-shaped spring has a forming height of up to 100 mm, and a special guide plate needs to be planned. It cannot be guided by the gap between the machined surface and the side wall of the die. If the force cannot be effectively eliminated, after mass production, the guide gap will increase due to long-term wear and tear, and the normal guide function of the mold will be lost in advance, thereby causing vicious quality accidents.
