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Plastic molds teach you how to improve the stability of the mold

Update:23-11-2019
Summary:

In the practice of production, once some molds are put […]

In the practice of production, once some molds are put into the production line, they often have various problems, and they are not satisfied with the production requirements or technical requirements of the products, resulting in abnormal strikes on the production line, which brings many unstable factors. Therefore, how to improve the stability of the mold has become a practical problem faced by the mold making enterprises.
Plastic mold
In the design and production of molds, the experience and technology of the designers play a key role. Whether the design is reasonable or not, it can only be recognized after the trial model, and the mold needs to be tried and corrected repeatedly after many times. In the practice of production, once some molds are put into the production line, they often have various problems, and they are not satisfied with the production requirements or technical requirements of the products, resulting in abnormal strikes on the production line, which brings many unstable factors. Therefore, how to improve the stability of the mold has become a practical problem faced by the mold making enterprises.

What is stability stability is divided into process stability and production stability. Process stability refers to a process plan that is satisfactory for the production of qualified products; the stability of production indicates the stable production capacity during the production process.

Let us first look at the main factors affecting the stability of the mold and stamping. They are: the application method of mold data; the strength requirements of mold structural parts; the stability of stamping data function; the fluctuation characteristics of data thickness; the range of change of raw materials; the resistance of tensile ribs; the range of blank holder force; .
It is worth noting that in the stamping process, because each stamping sheet has its own chemical composition, mechanical function and characteristic values ​​closely related to the stamping function, the function of the stamping data is unstable, the thickness of the stamping material fluctuates, and The change of stamping raw materials not only directly affects the precision and quality of stamping and forming, but also may cause damage to the mold.

Taking stretch ribs as an example, it occupies a very important position in stamping. In the stretch forming process, the forming requirements of the product have a certain thickness and a proper pulling force along the fixed periphery. The pulling force comes from the effect force of the punching device, the deformation resistance of the edge portion data, and the movable resistance on the crimping ring surface. . The occurrence of resistance to the movement, if only relying on the effect of the blanking force, the friction between the mold and the material is not enough.

For this reason, it is necessary to set a tensile rib on the crimping ring to generate a large resistance to increase the resistance of the feed, and then to make a large plastic deformation of the data to satisfy the requirements of plastic deformation and plasticity of the data. At the same time, by changing the size and distribution of the resistance of the tensile ribs, and controlling the speed of the movement of the data into the mold and the amount of feed, the useful adjustment of the tensile force and its distribution in each deformation region of the tensile member is achieved, and then the stretching is prevented. Quality problems such as cracking, wrinkling, and deformation of the product during forming.

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