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Fan X.-Q.,Baoding Fengfan Precision Casting Products Co. | Zhang Y.-J.,Fengfan Ltd Company
Zhuzao/Foundry | Year: 2015

The precision casting process was adopted to U type screw pressure diffuser, due to the casting structure is complex, the wall thickness difference is big, the shell preparation and the clear shell technology are poor. The technology was improved: first 3 times before the mold shell have been manufacturing by the zirconium sand, zirconium powder with high degree of refractory and the control of slurry viscosity to complete, then the channel has been blocked at both ends of the diffuser by refractory mud composed of magnesium powder, magnesium powder and water glass. In the annular confined flow channel, the filling angle of the large zirconium sand is filled in the mold shell by shaking, the shell preparation and clean shell of U type spiral diffuser has been solved. ©, 2015, Chinese Mechanical Engineering Society. All right reserved. Source


Xiuqia F.,Baoding Fengfan Precision Casting Products Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2011

Manufacturing of square hole in investment casting stainless operation handles by broaching, punching hole and extrusion method was introduced, and machining experiment of the square hole was conducted. The practical production shows that the square hole in the investment casting stainless manufactured by extrusion method exhibits the advantages of low product cost, rapid manufacturing and high machining precision. Source


Fan X.,Baoding Fengfan Precision Casting Products Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2011

Roles of different elements in austenitic stainless steel were described. CrE/NiE equivalent was calculated by the empirical formula. Ferritic content in the austenitic stainless steel was estimated by the CrE/NiE relation diagram. Magnetic permeability of the castings was measured with magnetic permeability instrument. Nonlinear relationship between CrE/NiE, ferritic content and magnetic permeability was verified. Source


Fan X.-Q.,Baoding Fengfan Precision Casting Products Co. | Li W.,Baoding Fengfan Precision Casting Products Co.
Zhuzao/Foundry | Year: 2015

The U type spiral booster diffuser is a key component of the complex structure of the new high pressure pump with thin wall. The precision casting process was adopted for U spiral booster diffuser, and the cleaning sand is very difficult. Therefore, the cleaning shell process has been designed with ultra high pressure hydro-blasting. The problem of cleaning sand for U type spiral booster diffuser was solved by designing high pressure hydro-blasting room and process equipment, and with the help of handmade carbon arc air gouging, special file, and product correction tool. ©, 2015, Chinese Mechanical Engineering Society. All right reserved. Source


Fan X.,Baoding Fengfan Precision Casting Products Co. | Tang Y.,Baoding Fengfan Precision Casting Products Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2011

The tolerance of the main installed dimension of C2, C2K typed blade fram of scraper for conveyor is required to be CT2∼3 class. Through adjusting mould dimension, making the draft angle of some key location in the mould to 0, using side-core-board and push-out mechanism to take out the wax pattern, designing hard-wax core to reduce shaping error of the wax pattern as well as using special knife to repair the wax pattern, and setting rational wax pattern assembling tree, pouring with a higher temperature, CT2∼3 class accuracy can be realized in the key location in the heat treated investment castings after controlling geometric tolerance with dedicated gauges and C shaped plate. Source

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