The demoulding mechanism of two-color liquid silicone mold plays a key role in the smooth molding of products and the efficient operation of molds. The rationality of its design directly affects the reliability of production and product quality.
First of all, the structural form of the demoulding mechanism is very important. Common demoulding mechanisms include ejector demoulding, push plate demoulding, pneumatic demoulding, etc. For two-color liquid silicone mold, due to the softness of silicone products and the possible complex shapes, comprehensive consideration is required. For example, in some products with deep grooves or undercut structures, simple ejector demoulding may damage the product. At this time, it is more appropriate to use a push plate demoulding combined with a local ejector. The push plate can evenly push the product out of the core, while the ejector can assist in the demoulding of some small parts. Such a combined structure can effectively improve the success rate of demoulding and reduce the risk of product damage.
Secondly, the calculation and control of demoulding force is one of the core points of the design. The magnitude of the demoulding force depends on factors such as the adhesion and friction between the silicone product and the mold cavity and core, as well as the shape and structure of the product. When designing the demoulding mechanism, the demoulding force must be accurately calculated in order to select the appropriate power source and transmission components. If the demoulding force is too large, it may cause product strain or mold damage; if it is too small, smooth demoulding cannot be achieved. For example, by analyzing the parameters such as the properties of silicone materials, the surface roughness of the mold, and the demoulding area of the product, the approximate demoulding force range is calculated using relevant formulas, and then the appropriate cylinder specifications are selected or the number and distribution of ejectors are determined based on this to ensure that the demoulding force is uniform and appropriate.
Furthermore, the reliability of the demoulding mechanism is also closely related to the maintenance and care of the mold. During the use of the mold, the components of the demoulding mechanism will be affected by wear and corrosion. Therefore, wear-resistant and corrosion-resistant materials should be used to make demoulding parts, such as high-quality steel and appropriate surface treatment. At the same time, a regular maintenance system should be established to check the operating status of the demoulding mechanism, clean dirt and lubricate moving parts in time, and replace worn parts. For example, regularly check the straightness and head wear of the ejector pins, and clean and lubricate the guide mechanism of the push plate, which can extend the service life of the demoulding mechanism and ensure its reliability during long-term production.
Finally, simulation and optimization of the demoulding process are important means to improve reliability. With the help of computer-aided engineering (CAE) software, the molding and demoulding process of two-color liquid silicone rubber is simulated and analyzed. It is possible to predict possible demoulding problems in advance, such as product deformation and jamming, and optimize the design of the demoulding mechanism according to the simulation results. For example, if the demoulding force is concentrated in a certain part through simulation, the ejector pin can be added or the push plate structure can be improved in a targeted manner, thereby improving the smoothness and reliability of demoulding, reducing the scrap rate in actual production, and improving production efficiency and economic benefits.
