What are the practical problems faced by injection mold manufacturing enterprises?


Author: MULAN -Plastic Molding Manufacturer

In the design and manufacture of molds, the experience and skills of designers play a key role. Whether the design is reasonable or not can only be confirmed through mold testing; while the mold needs to go through multiple mold trials and repeated revisions before it can be finally completed. In production practice, once some molds are put into use on the production line, various problems often arise, unable to meet the production requirements or technical requirements of the product, resulting in abnormal shutdown of the production line, etc., bringing many unstable factors.

Therefore, how to improve the stability of the mold has become a practical problem faced by mold manufacturing enterprises. Let's take a look with the injection mold processing manufacturers! It is worth noting that in the process of stamping and forming, since each stamping sheet has its own chemical composition, mechanical properties and characteristic values ​​closely related to stamping performance, the performance of stamping materials is different. Stability, fluctuations in the thickness of the stamping material, and changes in the stamping material not only directly affect the precision and quality of the stamping process, but may also cause damage to the mold. Taking stretch rib as an example, it occupies a very important position in stamping forming.

In the stretch forming process, the forming of the product requires a certain amount of tension that is properly distributed along the fixed periphery. This tension comes from the force of the stamping equipment, the deformation resistance of the material at the edge, and the flow resistance on the blankholder surface. . The generation of flow resistance, if only relying on the blank holder force, the friction between the mold and the material is not enough. 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 a stable process plan for the production of qualified products; production stability refers to a stable production capacity in the production process. Since most of the domestic mold manufacturing enterprises are small and medium-sized enterprises, and a considerable part of them are still in the traditional workshop-style production management stage, they often ignore the stability of the mold, resulting in long mold development cycles and high manufacturing costs. Restricted the pace of development of enterprises. Let us first take a look at the main factors affecting the stability of molds and stamping forming, namely: the use of mold materials; the strength requirements of mold structural parts; the stability of stamping material properties; the fluctuation characteristics of material thickness; the range of material changes ; Stretch tendon resistance size; blank holder force variation range; lubricant selection.

For this reason, stretching ribs that can generate greater resistance must be provided on the blank holder to increase the resistance of feeding, so that the material can undergo greater plastic deformation to meet the requirements of plastic deformation and plastic flow of the material. At the same time, by changing the size and distribution of the resistance of the stretching ribs, and controlling the speed and feeding amount of the material flowing into the mold, the effective adjustment of the tension and its distribution in each deformation area of ​​the stretched part is realized, thereby preventing stretching. Product quality problems such as cracking, wrinkling, and deformation during forming. It can be seen from the above that in the process of formulating the stamping process and die design, the size of the tensile resistance must be considered, and the tensile ribs are arranged according to the range of the blank holder force and the form of the tensile ribs is determined, so that each deformation area can be deformed according to the required deformation. The way and degree of deformation complete the forming.

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