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The recent development of artificial sand profile spherical


Experience shows that the preparation of sodium silicate sand with spherical CO: sand,[link widoczny dla zalogowanych], mobility, and hardening rapidly than the chromite sand permeability was increased by 4 to 6 times, real-time strength is also much higher than chromite sand. Mg produced by rolling method of spherical mass pouring sand in the first heavy machinery presses Qingling 50001 main gear steel casting, casting quality 11.6t,[link widoczny dla zalogowanych], Riser 101, 21.61 total mass of molten steel, the maximum thickness 210mm, Jing for the water glass bonding. Blowing CO: hardening. The results showed that Mg has a good quality spherical sand mobility and permeability, sand core hardening fast, blowing CO: time can be significantly reduced. Burn after injection no sticky sand casting surface, the surface roughness of Rn50 ~ 100m, casting surface without casting defects. In contact with the spherical casting sand smooth surface, coating integrity, no significant sintering of spherical surface layer of sand. The chromite sand around the surface of IOmm serious sintering layer. This result suggests that Mg-Al heat transfer capacity of more than spherical sand chromite sand, which can be cast in larger or more generous slice of hot section parts of applications. 3 application prospects of spherical sand sand preparation of spherical compound for the development of new types of special sand has opened up a new way. According to local resources and specific needs can be manufactured with different components and different properties of various casting of the original sand. The current direction of development of spherical sand mainly in the following areas: (1) the use of rich bauxite resources, development and expansion of coated sand with low or high aluminum mullite spherical sand. This will improve our automobiles, tractors, hydraulic parts and other heavy industries casting quality playing a very important significance, should increase research and development efforts and input. (2) the development of other components of the spherical system of sand, the progressive realization of series and commercialization of products. (3) use of waste and reduce costs. Use of metallurgy, refractory, mining and other industries such as industrial and natural waste gangue, forsterite powder, metallurgical slag, waste bricks and so on, through appropriate re-sets can be made of foundry sand. Spherical sand can reduce the cost, but also turning waste into treasure. In short, the ball of sand with a high refractoriness, low thermal expansion,[link widoczny dla zalogowanych], sand and good fluidity and permeability and a series of advantages, but also a better use of national or local resources. Therefore,[link widoczny dla zalogowanych], the spherical sand in the foundry industry has very broad application prospects. References; [1] Linsuo lay. HSBC and other British people. Bo made the original sands research and development [J]. Left egg material. 1991 (1),[link widoczny dla zalogowanych], 547. [Z] Lien Ping. Sand of thorium compound that Charlie [D]. R Tsinghua University, Beijing. i989. [3] The deputy jade in the shape of material very sterile so the quality of earnings * actinides parts 0]. Machine edge work. 1988 (3) r25. [4] of a bee A Post. Si particles in force right foot sand chasing bad speech with [J]. Cao Yun. 1992,64 ( 562 ~ 56. [5] Shen Ping Tin heap. Bo made of sand and dried form. 9 for the method of [P]. Japanese patent t level i-2844551989 · 1l · 15. [6] Hirata heap press. Bo Rong-shaped sand-made production methods [P]. Japanese motor patent, flat 3 479431999-0-22. [?] Slander Min. More casting shell and made the current offerings, Chen Yan 1]. Special 'I even colored sets box buildings. 1999 (2) f33 ~ 36. Port] identified sensitive. Thermal expansion of the overlying sand Deer Study [J]. Taiwan relies on genetic and non-ferrous specialty barrier l996. (5J | l2. [9] TakuyaA ~ kawa. Bo Ang sand core component [P]. Gui present patent IDE4446352AIl995 · 07 a l9. (On the next page 39) improved technology, the parts, then the phenomenon of cracking does not appear 4. Conclusion 0Crl7Ni4Cu4Nb steel forgings, the solution treatment process, the center is not transparent to Ms temperature of the cold will be the following aging treatment to produce a large residual stress; in the forging process, control of process parameters are not allowed because of arising folding, forging and other mixed crystal defects in the aging stress concentration, leading to delayed cracking failure of the main reasons for forging. References: [1] Wei Tian Stanford Ave. actinide heat treatment is not Dian [M]. Beijing Machinery Industry out of t 】 pupil social .1983. [2] Donald Gui. Pike Na editor. not Dian actinide Manual [M]. Beijing; machine edges Industry Press 198. [3] ZHANG Shou-Hua. Taiwan stack actinides [M]. Beijing MCC Mu Tong industrial out as .1981. [4] Society of Japanese cars to move between processing bats. Pressure Processing Manual [M]. Beijing unit edges ship industry a community. i984. [5] Yoshida, Henry. Ru waste treatment measures to prevent [M] . Beijing; machine out of bamboo mat edge industrial society. i979. [6] Free Gui Man. base machine edge of the root and then [M]. Beijing: Machine Industry a bamboo mat edge social workers .198 Z.1 heat pumping process) 4 2000 of

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