Syringe mould design and manufacturing
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Syringe Mould design and manufacturing are closely related to plastic processing. The success or failure of plastic processing depends largely on the effect of mold design and mold manufacturing quality, and plastic mold design is based on correct plastic product design.
The structural elements to be considered in the design of syringe plastic mold are:
1. Parting surface, that is, the contact surface where the concave mold and the convex mold cooperate with each other when the mold is closed. The selection of its location and form is affected by factors such as product shape and appearance, wall thickness, molding method, post-processing technology, mold type and structure, demoulding method and molding machine structure.
2. The pouring system, that is, the feed channel from the nozzle of the injection molding machine to the cavity, including the main runner, the runner, the gate and the cold cavities. In particular, the selection of the gate position should be conducive to the molten plastic filling the cavity in a good flow state, and the solid runner and gate cold material attached to the product can be easily ejected from the mold and removed when the mold is opened.
3. Plastic shrinkage and various factors that affect the dimensional accuracy of products, such as mold manufacturing and assembly errors, mold wear, etc. In addition, when designing compression molds and injection molds, the matching of process and structural parameters of the molding machine should also be considered. Computer-aided design technology has been widely used in plastic mold design.
In the production process of syringe molds and products, mold materials often have various deformations. One of the reasons for material deformation is that in order to reduce costs, the actual mold material is not special mold steel, the template is insufficiently rigid, insufficient thickness, improper heat treatment and residuals Stress, EDM stress, etc., the above reasons often interact and increase the amount of deformation. In addition to the corresponding solution during processing, widen the mold feet or use afterburners at various points in the middle of the mold to support. Some molds are not very demanding, and can be heated and deformed at a high temperature instantaneously at the focus position, which is quite effective. People often grind off the edge of the template to reduce the contact surface. It is necessary to minimize the grinding depth to facilitate the effective life of the mold. It is difficult to correct the deviation of the angular dimension of the cavity after the template is deformed. The too tight core causes the cavity to be deformed by the wall. This phenomenon is particularly serious when there are multiple cavities.
If you barely use it, the flash in the middle of the template will not change. Especially for the injection of nylon and other products with good fluidity, the core should be ground and rebalanced. When the mold is repaired, it is welded on a thinner seat, and the amount of deformation cannot be ignored. Syringe mold is the most commonly used method in plastic processing. This method is suitable for all thermoplastics and some thermosetting plastics. The number of plastic products produced is beyond the reach of other molding methods. As one of the main tools for syringe mold processing, the injection pen mold is in terms of quality accuracy, manufacturing cycle and injection molding. The level of production efficiency and other aspects in the process directly affects the quality, output, cost, and product update of the product, and also determines the response ability and speed of the enterprise in the medical mould competition.