模具设计外文翻译--注塑成型(7)

movement, promote the parts. When putting back, all molding cycle standards are reaching, then next shape cycle can begin. Basic injection cycle as follows: shut the mould -- - injection plastic injection device that moves back -- -- -- determination transport cavity -- introducing parts. Some machines is from motor instead of hydraulic press or both. The cooling channels, assist cooling mould and plastic heat cure. Cooling undeserved can cause distortion forming. When the mould parts in the mold open, with the assistance of the internal putts burst open, and shape cycle completed. Resin or note billet model of the raw material, usually in pills or particle forms are provided. Resin balls into a great leakage at the bottom of the hopper, hopper and cylindrical level material barrel connections. In a nitrogen-treated barrel within the screw by motor rotation, raw materials particles will screw thread slot fill. The screw thread depth to one end of the mould has heating decreases, compression plastic. When screw rotation, plastic particles by screw drive advance, and bear melting needed extreme pressure and friction. In the process of melting, during the external nitrogen-treated barrel with resistanse wire to assist in heating and temperature control. Through the flow into the mold cavity plastic will solidify, forming an additional framework. This by molten residual material composition of the framework and melting resin flows from hopper wushan, it and cavity mould protrusion parallel, But with the direction of vertical shunt compresses the tao, used for molten plastic relay to the gate. Gate and runner system can be cut, twisting and reuse, sometimes in line - beside. By institutions Some mould are desig

ned to automatically from parts of the form. China plastics processing enterprise star ROM the cloth, throughout the country, the technology of equipment level irregular, most processing enterprises equipment all need technical reformation. In recent years, our country plastic machinery industry technology progress and remarkable, especially injection technology level and foreign famous brand product in the gap considerably reduced and internal control level, product quality and appearance shape, etc are achieved significant change. Choose domestically-manufactured equipment, with a small investment, also can be produced with an import equipment quality quite products. These for enterprise's technical renovation created a condition. In order to strengthen the plastic machinery, the use, maintenance and management, China's relevant departments have established related standards and implementation rules, and required the equipment management departments and production enterprise for equipment management and use achieves "scientific management, correctly use and reasonable lubrication, elaborate maintenance, maintenance regularly, plan maintenance, improve equipment intact rate, make the equipment frequently in good condition. Plastic injection molding technology is based on the principle of die-casting from 19th century and the early twentieth century developed, is currently the most widely used processing plastic one way. The method applies to all thermoplastics and parts of thermosetting plastic (occupy plastic volume 1/3) Injection system is the heart of injection molding machine, its effect is guaranteed timing, quantitatively the material plastication heating, and then taking certain pressure and speed of the equivalent as soon as possible an injection quantity of molten plastic injection mold cavity, even for a complete injection time pressure-keeping to mold cavity supplement for cooling and contraction of the cladding material, make the products close-grained and prevent mold cavity material reverse flow. Therefore, plastic injection unit must ensure uniform plasticizing, and have

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