Mold design and manufacturing, the designer's experience and skills play a key role. Design is reasonable or not, through the test model to confirm; and molds need to pass a number of test mode and repeated changes in order to eventually complete. Production practice, some mold once put into the production line after use, but often have a variety of problems, can not meet the production requirements of the product or technical requirements, resulting in abnormal production line, etc., bring a lot of instability. So, how to improve the stability of the mold, mold manufacturing enterprises to become a real problem.

The Stability of Mold and Stamping Forming and Its Influencing Factors

What is stability? Stability is divided into process stability and production stability. Process stability refers to the production of qualified products to meet the stability of the program; production stability refers to the production process has a stable production capacity.

As the domestic mold manufacturing enterprises are mostly small and medium enterprises, and a considerable part of which enterprises, still remain in the traditional workshop-style production management stage, often overlooked the

stability of the mold, resulting in a long mold development cycle, high manufacturing costs, Restricting the pace of development of enterprises.

Let us look at the main factors that affect the stability of mold and stamping, namely: the use of mold materials; mold structure strength requirements; stamping material performance stability; material thickness fluctuations; material changes ; The size of the tensile tendons; the range of the blank holder force; the choice of the lubricant.

Weighing the factors that affect stability

It is noteworthy that, during the press forming process, since each of the stamped sheets has its own chemical composition, mechanical properties and characteristic values ​​closely related to the stamping properties, the stagnation of the stamping material, the fluctuation of the thickness of the stamping material, and Stamping material changes, not only directly affect the accuracy of stamping and processing quality, may also lead to mold damage.

To stretch the ribs, for example, in the stamping process will occupy a very important position. During the stretch forming process, the forming of the product requires a certain size and a suitably distributed tension along the fixed periphery, which comes from the force of the punching device, the deformation resistance of the edge portion of the material, and the flow resistance on the blank holder The And the flow resistance of the generation, if only rely on the role of blank holder force, the mold and the friction between the material is not enough.

To this end, must also be set on the edge of the circle can produce greater resistance to the tensile tendons to increase the resistance of the feed, so that the material produces a large plastic deformation to meet the plastic deformation of plastic and plastic flow requirements. At the same time, by changing the size and distribution of the tensile tendons, and to control the flow of material to the mold speed and feed volume to achieve the deformation of the deformation of the tensile zone and its distribution of the effective adjustment, Forming the product when the rupture, wrinkling, and deformation and other quality problems. It can be seen from the above, in the development of stamping process and mold design process, we must consider the size of the tensile resistance, according to the range of the blank holder force to arrange the tensile tendons and determine the form of tensile tendons, so that the deformation of the deformation area Way and deformation to complete the forming.