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Huang B.-R.,Wuxi Impro Precision Casting Co. | Jing Z.-L.,Zhengzhou Dayu Chemical Products Co.
Zhuzao/Foundry | Year: 2012

Silicon sol shell moulding technology with medium-temperature pattern material is the main technology in production of investment castings at home and abroad. However, production cycle of this technology is too long, and casting defects often occur due to the surface defects of shell mold. Some measures were adopted, such as adding anti-cracking agent to the surface slurry, drying the surface layer by strong wind, using big size colloidal particle in surface slurry, cancelling the prewetting before coating second layer, cancelling coating of the silicon sol before the surface coating. The results show that the surface strength of shell mold is increased, defects on the surface of shell mold are decreased, drying time of coating is shortened, and the qualified rate of the castings is increased. Source


Huang B.-R.,Wuxi Impro Precision Casting Co. | Jing Z.-L.,Zhengzhou Dayu Chemical Products Co.
Zhuzao/Foundry | Year: 2011

The characteristic of the turbine structure is the great difference of thickness between the shell and blade, in which a large number of thin-wall blades connect with a semicircle ring, so it is difficult to cast. By strengthening the detailed process control, the castings finally meet the customer's requirement in the trial production with non-vacuum smelting and non-vacuum pouring. Source


Jing Z.-L.,Zhengzhou Dayu Chemical Products Co. | Wu Y.-Z.,Shenzhen Long Line of New Material Co. | Sun X.,Lianyungang in the East China Sea Dragon New Quartz Material Co.
Zhuzao/Foundry | Year: 2015

Two kinds of slurry were tested for surface shell making technology, which are 30% zircon powder+70% fused silica powder and 50% zircon powder+50% fused silica powder. The two kinds of different density powder was sufficiently mixed, the properties of fluidity, the spreadability and dispersity of slurry are good. The production trial show that the surface roughness and dimensional accuracy of castings produced by mixed slurry are similar to the castings produced by 100% zircon powder slurry, cleaning is simple and the cost of making mould shell was decreased. ©, 2015, Chinese Mechanical Engineering Society. All right reserved. Source


Huang B.-R.,Wuxi Eagle Prachanda Investment Casting Co. | Che S.-J.,Zhengzhou Dayu Chemical Products Co. | Jing Z.-L.,Zhengzhou Dayu Chemical Products Co.
Zhuzao/Foundry | Year: 2011

Black pitting and pockmark are common defects in the investment casting, and are very difficult to solve. The effective method to eliminate black pitting, the pockmark and check crack was found after some process methods were applied, such as using corundum sand as surface sand, buckling box after pouring, adding graphite in coating slurry, part wind cooling and part water cooling after pouring, setting process nail and continuous improvement process condition. Source


Jing Z.-L.,Zhengzhou Dayu Chemical Products Co. | Che S.-Q.,Zhengzhou Dayu Chemical Products Co.
Zhuzao/Foundry | Year: 2012

In this paper, the lay of the correction insert, the application of the binary compound core and the process measures of air brick argon blowing were introduced. To realize quality control of castings, the process measures were adopted, such as improving the local position dimensional precision, reducing casting internal defects and refining molten steel, and so on. It does solve the difficulty and quality hidden trouble in the production. The quality of the casting was promoted, and the quality control purpose of precision casting was achieved. Source

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