In the production practice, once some moulds are put into the production line, they often have various problems, which can not meet the production requirements or technical requirements of the products, resulting in the abnormal shutdown of the production line, which brings many unstable factors. Therefore, how to improve the stability of the mould has become a real problem faced by mould manufacturing enterprises.
Designer experience and skills play a key role in the design and manufacture of moulds. Whether the design is reasonable or not can be confirmed by trial mode, and the mould needs to be tried and modified repeatedly to complete it.
Stability of mould and stamping and its influencing factors
Stability is divided into process stability and production stability. Process stability comprehensive trade-offs affect various factors
It is worth noting that in the stamping process, since each stamped sheet has its chemical composition, mechanical properties and characteristic values closely related to the stamping properties, the performance of the stamping material is unstable, the thickness of the stamping material fluctuates, and the stamping The change of material not only directly affects the precision and quality of stamping and forming, but also may cause damage to the mould.
Taking stretch ribs as an example, it occupies a very important position in stamping. In the stretch forming process, the forming of the product requires a pulling force of a certain size and appropriately distributed along the fixed periphery. The pulling force comes from the force of the punching device, the deformation resistance of the material at the edge portion, and the flow resistance on the crimping ring surface. However, if the flow resistance is generated only by the action of the blank holder force, the friction between the mould and the material is insufficient.
Therefore, it is necessary to provide a tensile rib on the binder ring to generate a large resistance to increase the resistance of the feed, thereby causing a large plastic deformation of the material 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 tensile ribs, and controlling the speed of the material flowing into the mould and the amount of feed, effective adjustment of the tensile force and its distribution in each deformation region of the tensile member is achieved, thereby preventing stretching. Quality problems such as cracking, wrinkling, and deformation of the product during forming.
It can be seen from the above that in the process of formulating the stamping process and the mould design, the magnitude of the tensile resistance must be considered. The tensile ribs are arranged according to the range of the blanking force and the form of the tensile ribs is determined so that the deformation regions are deformed as needed. The way and degree of deformation are completed.
Post time: Nov-07-2019