塑料模具外文翻译---关于电铸镍壳在注塑模具中应用的技术研究-模具设计(编辑修改稿)

塑料模具外文翻译---关于电铸镍壳在注塑模具中应用的技术研究-模具设计(编辑修改稿)内容摘要：

ing technique is not something new because its applications in the industry are countless [3], but this research work has tried to investigate to what extent and under which parameters the use of this technique in the production of rapid molds is technically feasible. All made in an accurate and systematized way of use and proposing a working method. 2. Manufacturing process of an injection mold The core is formed by a thin nickel shell that is obtained through the electroforming process, and that is filled with an epoxic resin with metallic charge during the integration in the core plate [4] This mold (Fig. 1) permits the direct manufacturing by injection of a type a multiple use specimen, as they are defined by the UNEEN ISO 3167 standard. The purpose of this specimen is to determine the mechanical properties of a collection of materials representative industry, injected in these tools and its coMParison with the properties obtained by conventional tools. Fig. 1. Manufactured injection mold with electroformed core. 天津科技大学外文资料翻译 15 The stages to obtain a core [4], according to the methodology researched in this work, are the following: (a) Design in CAD system of the desired object. (b) Model manufacturing in a rapid prototyping equipment (FDM system). The material used will be an ABS plastic. (c) Manufacturing of a nickel electroformed shell starting from the previous model that has been coated with a conductive paint beforehand (it must have electrical conductivity). (d) Removal of the shell from the model. (e) Production of the core by filling the back of the shell with epoxy resin resistant to high temperatures and with the refrigerating ducts made with copper tubes. The injection mold had two cavities, one of them was the electroformed core and the other was directly machined in the moving platen. Thus, it was obtained, with the same tool and in the same process conditions, to inject simultaneously two specimens in cavities manufactured with different technologies. Plastic Injection Molding is the world’s most mon method of producing plex mercial plastic parts with excellent dimensional tolerance. According to the Cmold designguide, 32% by weight of all plastics processed go through Injection Molding machines, Injection Molding one of the most important manufacturing processes2. It is seen that thefinal molded part quality is chiefly dependent on the type of material, mold design and themolding process settings. Once the material and the mold to be used are specified, the partquality basically depends on the molding process. The molding process is quite plexinvolving many variable process parameters like pressure, temperature and time settings. Thesprocess parameters have to be optimally set in order to improve part quality and maximize the production capacity of the Injection Molding machine. Educated and experienced individualsare required to set up and optimize such a plex process. These individuals control themolding process on a trial and error basis, which is usually time consuming. This method ofcontrolling the molding process relies heavily on operator intuition anda few “rules of thumb,”which the operator develops over a period of time while working with different materials,pressures, temperatures and time settings. The 天津科技大学外文资料翻译 16 plastics industry is one of the world39。 s fastest growing industry, belongs to a small number of hundreds of millions of dollars in industry. Almost all the supplies in their daily lives are inseparable from the plastic and most can use plastic injection mold production. Injection molding injection molding process to take advantage of lowcost production of a variety of shapes and plex geometric patterns known [2]. Injection molding injection molding process is a cyclic process. Can be divided into four key stages of packing, injection, cooling, demoulding. Plastic injection molding process begins to fill in the resin and the amount of additives to the hopper into the heating of the injection molding machine or injection system. Grain filling stage in injection temperature, the hot plastic melt into the mold cavity. The cavity is filled, the amount of molten plastic in the plastic solidification shrinkage caused by a higher pensation under the pressure of added. Followed by a cooling phase, the mold was cooled to a sufficient rigidity extrusion mold. Finally, the stripping stage, that is, open the mold and then the top part, and then together on the mold start the next cycle. The design and manufacture of injection molded plastic products with the expected performance is to rely on the experience of control of an expensive process, including the actual modification of the cover embossed. In mold design, design mold supplementary geometry, usually in the side of the core, including the plex projection and groove. Mold design must take into account many important design factor. These factors are the number and layout of the size of the mold cavity, runner system, gate systems, mold release systems, and shrinkage. Thermal analysis of the mold, the main objective is to analyze the role of the residual thermal stress or pressure injection of product diameter direction. Heat flux density enhancements in the cooling phase of the molded parts, mainly because of its low thermal conductivity and the temperature difference between the melting resin and mold. During cooling near the mold cavity will be nonuniform temperature region. During cooling, cooling channels near the area than the area far from the cooling channels to cool faster. This temperature difference will cause uneven shrinkage of the material to heat stress. The strong thermal stresses can cause warping problem. Therefore, it is an imitation of the important stage in the molded parts during the c。