One of the real problems faced by mold manufacturing companies is how to improve the stability of the mold.
The stability and influencing factors of mold and stamping.
What is stability? Stability is pided into process stability and production stability. Process stability refers to a process plan that satisfies the stability of a qualified product, production stability refers to a production capacity with stability during the production process.
The main factors affecting the stability of the mold and stamping, including the use of mold materials, the strength requirements of the mold structural parts, the stability of the properties of the stamping materials, the fluctuation characteristics of the material thickness, the range of material changes, the magnitude of the drawbead restraining force, the range of the blank holding force and the choice of lubricant.
Overall considerations the factors of affecting stability.
It is worth noting that in the stamping process, since each stamped sheet has its own chemical composition, mechanical properties and characteristic values closely related to the stamping properties, the properties of the stamping material are unstable, the thickness of the stamping material fluctuates, and the change of stamping material not only directly affects the precision and quality of stamping and forming, but also may cause damage to the mold.
Taking drawbead 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 mold and the material is insufficient.
To this end, it is also necessary to provide a drawbead on the crimping ring which can 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 drawbead, controlling the speed of the material flowing into the mold 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 mold 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 drawbead is determined, so that the deformation regions are deformed as needed. The form and degree of deformation are completed.
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