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Are You Solving The Common Problems With The Three Syringe Molds
Jul 09, 2018

Fracture of the syringe mold: The forged die material itself has cracked due to improper temperature control. In this case, only the template is changed. The template for cracking and even fracture in production is often caused by excessive heat treatment and excessive stress. It is prone to cracking during welding. In severe cases, especially in the welding of Cr12 hard material, it is easy to crack. The template stress is too large, and the impact cracking is mostly at the sharp corner of the cavity. If it can be used, it can be punched and cut into a shape, or it can be hung around the template. Wear of the syringe mold: especially the thermosetting plastic mold and aluminum alloy injection mold wear phenomenon is serious. In the injection mold, the position of the movable part is not strong enough, there is a sharp angle, and improper selection of materials is also the cause of wear. For corrosive products and plastics with considerable hardness and filler, we choose the surface of the material to be corrosion resistant and have a high surface hardness. Poor heat dissipation of the syringe mold: The heat dissipation of the long core mold is very important, and the selection of appropriate materials has a large gap between the appearance of the product and the yield of the product. For example, materials such as beryllium copper containing bismuth and cobalt are used, which have high strength, hardness, fatigue resistance, wear resistance and good heat transfer after heat treatment.


In the mold and product production process, mold materials often have various defects, deformation: One of the reasons for material deformation is that in order to reduce the cost, the material of the actual mold is not a special mold steel, the rigidity of the template is insufficient, the thickness is not enough, and the heat treatment is improper. And the residual stress, EDM stress, etc., the above reasons often interact, increasing the amount of deformation. In addition to the corresponding solution, the widening of the die or the use of the force column at each point in the middle of the mold is used. Some molds are not required to be high in themselves, and can be heated and deformed at a high temperature in the focus position, which is quite effective. People often wear off the edges of the template to reduce the contact surface, and to minimize the depth of the mold to facilitate the effective life of the mold. The deviation of the angular dimension of the cavity after deformation of the template is difficult to correct. The over-tightened core causes the cavity to be deformed by the wall. This phenomenon is particularly serious when the cavity is multi-cavity. If it is used barely, the flash in the middle of the template will not change. In particular, injection of nylon and other fluidity products should be smoothed with a heavy core. When the mold is trimmed, it is welded to a thin seat, and the amount of deformation is not negligible. Syringe molds are the most commonly used method in plastic processing. The method is applicable to all thermoplastics and some thermosetting plastics. The quantity of plastic products produced is far beyond the reach of other molding methods. As one of the main tools for the processing of syringe molds, the injection molding pen mold is in quality precision, manufacturing cycle and injection molding. The level of production efficiency in the process directly affects the quality, output, cost and product renewal of the product, and also determines the ability and speed of the company's response in the market competition.


Requirements for materials for syringe molds With the development of the plastics industry, the complexity and precision of plastic products are becoming more and more demanding, and higher requirements are placed on the material of syringe molds. For the production of complex, precise and corrosion-resistant plastic molds, pre-hardened steel (such as PMS), corrosion-resistant steel (such as PCR) and low-carbon maraging steel (such as 18Ni-250) can be used. Machining, heat treatment and polishing performance and high strength. The injection mold point gate structure for facilitating the breakage from the root of the point gate during injection molding comprises: a point gate sleeve disposed in the mold, the point gate in the point gate sleeve is in communication with the cavity of the mold, the point The gate is a full taper tapered hole. The point gate of this product is a full-tapered tapered hole with the same taper from head to tail. When injection molding, the point gate is easy to pull off from the root, which greatly improves the product precision; in addition, the tapered hole can be used. After piercing, the wire is cut and processed. As we all know, wire cutting processing can greatly improve the smoothness and precision of the point gate, shorten the processing time, and improve the processing efficiency. For example, the mold of the plastic magnetic rotor of the indoor and outdoor machine of the inverter air conditioner is processed. It only takes about an hour.



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