塑料模具外文翻譯---關于電鑄鎳殼在注塑模具中應用的技術研究-模具設計-文庫吧在線文庫

　　

【正文】 temperature were mainly modified. The samples were analyzed in frontal section and in transversal section (perpendicular to the deposition). For achieving a convenient preparation, they were conveniently encapsulated in resin, polished and etched in different stages with a mixture of acetic acid and nitric acid. The etches are carried out at intervals of 15, 25, 40 and 50 s, after being polished again, in order to be observed afterwards in a metallographic microscope Olympus PME3ADL /10. Before going on to ment the photographs shown in this article, it is necessary to say that the models used to manufacture the shells were made in a FDM rapid prototyping machine where the molten plastic material (ABS), that later solidifies, is settled layer by layer. In each layer, the extruder die leaves a thread approximately 天津科技大學外文資料翻譯 20 mm in diameter which is pacted horizontal and vertically with the thread settled inmediately after. Thus, in the surface it can be observed thin lines that indicate the roads followed by the head of the machine. These lines are going to act as a reference to indicate the reproducibility level of the nickel settled. The reproducibility of the model is going to be a fundamental element to evaluate a basic aspect of injection molds: the surface texture. The tested series are indicated in Table 1. Table 1. Tested series Series pH Temperature (176。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 cooling area of the thermal residual stress. Understand the characteristics of the thermal stress, causing deformation of presimulation. In this article, the injection mold is designed to produce warping of test samples and perform the thermal analysis presented in the mold on the role of the residual thermal 天津科技大學外文資料翻譯 17 stress. After the pletion of the mold design and manufacture of, tryout injection warp specimens there are many defects. Including a short shot, splash and warping. The solution of a short shot by milling out the additional pores to drain the trapped air in the corner of the cavity. At the same time, reducing the injection pressure can reduce the occurrence of splashing. Warpage control can be controlled by many factors, such as injection time, injection temperature and dissolved material temperature. After these trimming, mold can produce lowcost highquality warp specimens, these specimens need to go through a simple polishing. 3. Obtaining an electroformed shell: the equipment Electrodeposition [5] and [6] is an electrochemical process in which a chemical change has its origin within an electrolyte when passing an electric current through it. The electrolytic bath is formed by metal salts with two submerged electrodes, an anode (nickel) and a cathode (model), through which it is made to pass an intensity ing from a DC current. When the current flows through the circuit, the metal ions present in the solution are transformed into atoms that are settled on the cathode creating a more or less uniform deposit layer. The plating bath used in this work is formed by nickel sulfamate [7] and [8] at a concentration of 400 ml/l, nickel chloride (10 g/l), boric acid (50 g/l), Allbrite SLA (30 cc/l) and Allbrite 703 (2 cc/l). The selection of this position is mainly due to the type of application we intend, that is to say, injection molds, even when the injection is made with fibreglass. Nickel sulfamate allows us to