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Fracture of the syringe mold: due to improper temperatu […]
Fracture of the syringe mold: due to improper temperature control, the forged mold material has cracked itself. In this case, only the template must be changed. The cracked or even cracked template in production is often caused by the high hardness and excessive stress of the heat treatment of the selected material. Cracking is easy to occur during welding. In severe cases, cracking is especially easy to occur when welding Cr12 hard materials. The template has excessive stress, and most of the impact cracks are at the sharp corners of the cavity. If it can still be used, it can be perforated and cut in I-shape, or it can be hugged around the template. Wear of syringe molds: Especially the wear of thermoset plastic molds and aluminum alloy injection molds is severe. The hardness of the movable parts in the injection mold is not enough, there are sharp angles, and improper selection of materials is also the cause of wear. For highly corrosive products and plastics with considerable hardness and fillers, the surface of the materials we choose should be resistant to corrosion and the surface hardness should be high. Poor heat dissipation of the syringe mold: The heat dissipation of the long core mold is very important. Selecting appropriate materials has a large gap between product appearance and product output. If beryllium copper and other materials containing beryllium and cobalt are selected, after heat treatment, it will have higher strength, hardness, fatigue resistance, wear resistance and good heat transfer.
During the production of syringe molds and products, mold materials often have various defects and deformations. One of the reasons for the deformation of the materials is that in order to reduce costs, the actual mold material is not a special mold steel, the rigidity of the template is insufficient, the thickness is insufficient, and the heat treatment is improper. And residual stress, electrical discharge machining stress, etc., the above reasons often interact with each other, increasing the amount of deformation. In addition to the corresponding solution during processing, widen the mold feet or use a force column at each point in the middle of the mold. Some molds are not very demanding, and can be heated and deformed instantly at the focal point, which is quite effective. People often grind off the edges of the template to reduce the contact surface, and it is necessary to reduce the grinding depth as much as possible to facilitate the effective life of the mold. It is difficult to correct the deviation of the cavity angle scale after the template is deformed. The over-tight core causes the cavity to be deformed by the wall. This phenomenon is particularly serious when the cavity is multi-cavity. If you use it reluctantly, the flash in the middle of the template will not change. , Especially for injection products with good fluidity, such as nylon, should be smoothed with a heavy core. When the mold is trimmed and welded in a thinner position, the amount of deformation can not be ignored. Syringe molds are the most commonly used method in plastic processing. This method is suitable for all thermoplastics and some thermosetting plastics. The amount of plastic products produced is unmatched by other molding methods. As one of the main tools for injection mold processing, injection pen molds are used in quality accuracy, manufacturing cycle and injection molding. The level of production efficiency in the process directly affects product quality, output, cost, and product update, and also determines the company's ability and speed to respond to market competition.
With the development of the plastics industry, the requirements for the complexity and accuracy of plastic products have become higher and higher, and higher requirements have also been placed on the materials for syringe molds. For the production of complex, precise and corrosion-resistant plastic molds, pre-hardened steels (such as PMS), corrosion-resistant steels (such as PCR), and low-carbon maraging steels (such as 18Ni-250) can be used. Cutting, heat treatment and polishing performance and high strength. The point gate structure of an injection mold which is convenient to be pulled off from the root of the point gate during injection molding includes a point gate sleeve provided in the mold, and the point gate in the point gate sleeve communicates with the cavity of the mold. The gate is a full-tapered tapered hole. The point gate of this product is a full-tapered tapered hole with the same taper from beginning to end. When injection molding, the point gate is easy to break from the root, which greatly improves the accuracy of the product. In addition, this tapered hole can be used It is processed after perforation and wire cutting. As we all know, wire cutting can greatly improve the finish and accuracy of point gates, shorten the processing time, and improve the processing efficiency. Take the machining of molds for plastic magnetic rotors of indoor and outdoor machines of inverter air conditioners as an example. It only takes about 1 hour.