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 Posted: Thu 21:58, 06 Jan 2011 Post subject: ugg stivali Hollow valve lifter of the casting pro |
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Hollow valve lifter of the casting process and tooling
The width of the B ~ --. 0.8H, sand board's role is to guide sand shot, the sand does not shoot a smooth flow of sand, the sand does not fall. 2 4 Conclusion gating system design for the closed casting system in Figure 1, its cross-section shape as shown in Figure 2. Liquid metal through the filter from the bottom of the sprue into the concave seat. The direction of metal flow into the opposite direction into the casting, molten metal at the same time according to their direction of rotation (which is conducive to withdraw slag, slag from a similar packets centrifugal set the date of closing prayer grapefruit t2000-05.08 liters of Korea Rent Pei (194o_) were male resistance to the North, Professor Wu pull research process t * Heritage Building Automation. 'hot process) for a 2000 57 a bamboo ● ● tI ■ r a board dip wash (1) Based on years of practice, developed a new process of hollow casting valve lifter and has been applied in production. Costs. (3) to improve the working conditions of workers, can achieve a small assembly line machinery (2) valve lifter from the solid to shell casting, saving raw materials production and improve productivity. Material, reducing the processing time and energy consumption,[link widoczny dla zalogowanych], improve quality, reduce frequency induction heating technology in the production of silicon carbide ApplicationofIF-inductlonHeatingTechnologyonSICProduction, Zhu Yue good. . (Zhejiang University, National Power Electronics _ engineering research in application technology,[link widoczny dla zalogowanych], Hangzhou 310027, China) summarized the silicon by the carbon-based liquid once impregnated billet orderly, high-temperature method to obtain high purity of Taiwan, high-density silicon carbide products: heating 'odd one' 4 ~ 14 (zo'TG15521tTQ1747582000 fecal number in the circle points. literatures busy information on the beat No. 1O0 article shrinking silicon carbide (sic) is a material second only to diamond hardness of this material to high temperature Feng}, with a smaller thermal expansion coefficient and high thermal conductivity,[link widoczny dla zalogowanych], silicon carbide materials and products which are widely used in the defense industry, mechanical industry and the semiconductor industry. The traditional production of silicon carbide materials are mostly quartz sand, coke, calcined rice husk mixing method The combined reaction is:-SiO2 +3 C-SiC +2 C0 + (1) was synthesized by the various forms of silicon carbide material is a mixture of SiC, and the mixture of raw materials made from such industrial products are generally required to increase the time additive materials, therefore, it is difficult to obtain high purity, high density silicon carbide industrial products. to obtain high purity, high density silicon carbide products, we use induction heating technology, high-temperature synthesis of silicon carbide a series of studies. SCR MF power supplies KGPS-i00kW18000Hz device as heating equipment, testing in a closed tank for graphite. through several pilot studies to verify the following few facts: (1) silicon (polysilicon) in the molten state, products of carbon materials have better affinity granted Run ability. (2) carbon, silicon compound materials under high temperature reaction of si + CSiC (2) process, control the reaction conditions can be obtained ~-SiC crystals. (3) Run by the fear of silicone fluid at high temperatures after the formation of SiC products combined with high hardness characteristics, the subsequent processing of poor performance, and thus carbon products, green body must ensure that the precise geometry to reduce the subsequent transformation of SiC workpiece grinding workload. Based on the above results, we determined the production of high purity, high density silicon carbide products, process is as follows: first carbon graphite plus adhesive orderly pressure forming, after processed into heating induction heating vacuum furnace heating , and then buried in the grant of Shen Yun in polysilicon silicon liquid bath, rose bath to refer to the above combination reaction temperature range, high temperature combined heat reaction zone of a reaction ... V after a certain time in the furnace to cool down when baked at low temperature, SiC is a finished product. This process is a key equipment to achieve the required temperature of inertia,[link widoczny dla zalogowanych], high vacuum, the vacuum reactor temperature control easy. To this end we choose a 100kw/25ooHz KGPS IF power as heating device, the design diameter of 1 .2 nl heat shield around the vacuum induction furnace for heating sic reactor, medium frequency induction loop isolation transformer to the furnace and electrical isolation and to Arab and vacuum furnace induction heating power supply loop to achieve the best match. SiC reactor shown in Figure 1. Its characteristics are: (1) the use of graphite crucible as the polysilicon liquid pool. At the same time retaining employees as a sense of light brick shell of Figure 1, silicon carbide reaction vacuum induction furnace units closing date of oath; 2000-05.08 for A transcript of the bamboo t package Shi Sun (194) * stomach,[link widoczny dla zalogowanych], on the chief engineer. Zhuman heating technology in the hoop should Ⅱ process. 'thermal processing technology) Shan Fan on' period
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