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Wu J.,Dongfeng Investment Casting Co. | Zhou G.,Xi'an Jiaotong University
Jinshu Rechuli/Heat Treatment of Metals | Year: 2012

Influence of adding method and content of rare earth on microstructure and properties of the high strength cast steel was researched by microstructure observation and mechanical property analysis. The results show that suitable amount of rare earth alloy added into the melt steel after deoxidization can reduce the inclusions and improve their morphology and the microstructure as well as the mechanical properties of the cast steel. The optimum additive is 300 g RE-Si alloy per 100 kg melting steel.


Shi Y.-J.,Dongfeng Investment Casting Co. | Zhang Z.-C.,Dongfeng Investment Casting Co. | Liu R.,Dongfeng Investment Casting Co.
Zhuzao/Foundry | Year: 2014

Batches of serious shrinkage defects occur in the process of trial-produce of large-scale steel investment casting. It is conjectured that the unreasonable filling sequence could be the main reason of shrinkage defects according to the results of flow field. And then improvement project was put forward based on flow field optimization. Simulation analysis shows that the improvement project has reasonable flow field. And physical verification shows that the improvement project has no defects. Based on the successful experience, casting process of the other product was optimized to improve the filling process. Production validation results indicate that the defects were eliminated entirely.


Shi Y.,Dongfeng Investment Casting Co. | Ma B.,Dongfeng Investment Casting Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2012

The cooling curves in solidification process of investment casting are very important for the inverse calculation of simulation parameters in ProCAST software. The cooling curve in solidification process of steel investment casting was measured and a method was put forward. The cooling curve of steel investment casting with a higher precision was presented through experimental test.


Xiao H.,Dongfeng Investment Casting Co. | Lan Y.,Dongfeng Investment Casting Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2013

The casting defects and the structure as well properties of investment casting steel parts were investigated at different vibration conditions, and the casting defects, mechanical properties and micro-structure of the casting were analyzed. The results show that proper vibration technology may not refine grain sizes and improve the mechanical properties, however it could effectively reduce casting slag holes and decrease the crack and the shrinkage porosity tendency as well as improving casting quality in the casting and solidification process.


Xiao H.,Dongfeng Investment Casting Co. | Yuan J.,Dongfeng Investment Casting Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2013

Through canceling normalizing before the traditional quenching and tempering process on ZG45 and ZGD650-830, influence of quenching + high temperature tempering process on the mechanical properties and microstructure of investment casting steel was analyzed. The results show that the mechanical properties and the microstructure of the investment steel casting after quenching at (920 ± 10)°C and high temperature tempering at (660 ± 10)°C Care near to those of normal tempering steel castings, which could replace completely the traditional tempering process, meeting control standard.


Lan Y.,Dongfeng Investment Casting Co.
Zhuzao/Foundry | Year: 2012

This paper presents a new shell-strengthening technique. The proportioning of hardening agent and the process control scheme were studied systematically. With this technology, the high-temperature strength of the sodium silicate ceramic shell molds was improved significantly, reached 11 MPa, which was almost as same as that of silica sol ceramic shell molds. The number of layers of the shell was also reduced. This shell-strengthening technology has been applied to mass production of sodium silicate shell molds.


Shi Y.,Dongfeng Investment Casting Co. | Ma B.,Dongfeng Investment Casting Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2014

Batches of cracking defects occur in large-scale steel investment castings with relative centralized location and a ratio of 30% to 50%. The stress field in the initial process was simulated by ProCAST software, and cracking defects were analyzed based on the simulation results. And then some improved processes were put forward and tested. Finally, desirable processing parameters were determined. Practical production reveals that the crack defect in the castings is decreased to 5%.


Liu J.-G.,Dongfeng Investment Casting Co. | Zeng D.-X.,Hubei University of Automotive Technology
Zhuzao/Foundry | Year: 2014

In recent years, study on the ductile iron with high strength and high elongation and the development of production technology received attention of related research institutions. Through experiment, the feasibility of developing as-cast QT700-10 technology was discussed by using a series of production processes such as reasonable composition design, molten iron purification, multi-element alloy solid solution strengthening, grain refinement, etc.


Liu J.-G.,Dongfeng Investment Casting Co.
Zhuzao/Foundry | Year: 2013

Energy saving of the traditional precision casting was discussed in this article. Through the research and application of such technology as lightweight design of precision castings, rebuilding roasting furnaces, improving production rate by optimizing modular group and shell-strengthening with less layers, the concept of the energy system optimization was put forward, which can be a reference for traditional precision casting enterprises to develop energy-saving and emission reduction.


Hao L.,Dongfeng Investment Casting Co. | Ma B.,Dongfeng Investment Casting Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2011

Structure optimization and processing design of forklift driving axle were conducted with the help of topological optimization and casting simulation software to reduce the weight of the parts. In the condition of confinement of the maximum rigidity of the driving axle, weight-reduction design of driving axle was implemented. Weight of the driving axle is decreased by 21.77 kg through two topological optimization and strength verification, and weight-reduction rate reaches up to 38.97%. Meanwhile, processing design was carried out by the CAE, realizing the minimum defects in the driving axle. The CAE can play the roles in shortening production period and decreasing cost in light-weight design of investment castings.

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