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Jiang K.-Y.,Tongji University | Xiao T.-Y.,Tongji University | Sun J.,Suzhou Sanji Foundry Equipment Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2013

The microstructure and properties of squeezing casting ZL111 aluminum matrix composites with 20% silicon carbide particles by horizontal squeezing casting machine were investigated. The results show that the composites can be prepared by horizontal squeezing casting with specific pressure of 135 MPa and extrusion punches speed of 0.4 m/s as well as pouring temperature of 710°C. The silicon carbide particles are uniformly distributed in the microstructure, and absence of aggregation of the SiCp can be observed, so the SiCp content is uniform in the composites samples. In addition, the SiC particles are distributed only in the eutectic structure in the composites samples. Wear resistance of the composite samples is significantly improved, leading to a sharp wear of cutting tool. Meanwhile, the Brinell hardness is in range of 76.7 HB~94.4 HB, which is basically near to that of ZL111 alloy. Source


Yang Q.,Jiangsu University | Jiang Y.,Jiangsu University | Dai Y.,Jiangsu University | Xu R.,Jiangsu University | And 2 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2016

The A356 alloy automotive sub-frame was produced by indirect squeeze casting. The process scheme and the processing parameters of indirect squeeze casting were determined. The sub-frame was manufactured successfully with the advanced 2000T vertical squeeze casting machine. The microstructure and mechanical properties of the sub-frame have been investigated by tensile testing, optical micro-scope and scanning electronic microscope. The results reveal that the sub-frame castings exhibit the satisfied appearance with compact structure and absence of casting defects with the pouring temperature of 690-710℃, the casting pressure of 95 MPa, the mold temperature of 240℃ and the holding time of 20 s. The tensile strength, elongation and hardness of aluminum alloy sub-frame specimen after T6 heat treatment can reach 291 MPa, 9.2% and 96HBW, respectively. With the bench test, the requirements of fatigue property can be satisfied and the lightweight level of vehicle is improved. © 2016, Journal Office of Special Casting and Nonferrous Alloys. All right reserved. Source


Yang Q.,Jiangsu University | Dai Y.,Jiangsu University | Jiang Y.,Jiangsu University | Xu R.,Jiangsu University | And 2 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015

The A356 alloy automotive sub-frame was produced by indirect squeeze casting. The process scheme and the process parameters of indirect squeeze casting were determined. The sub-frame was manufactured successfully by the advanced 2000T vertical squeeze casting machine. The microstructures and mechanical properties of the sub-frame have been investigated by tensile testing, optical microscope and scanning electronic microscope. The results reveal that the sub-frame castings exhibit the satisfied appearance with compact internal structure and absence of casting defects with the pouring temperature at 690-710℃, the casting pressure at 95 MPa, the mold temperature at 240℃ and the holding time of 20 s. The tensile strength, elongation and hardness of aluminum alloy sub-frame specimen after T6 heat treatment can reach to 291 MPa, 9.2% and 96 HBW, respectively. With the bench test, the require-ments of fatigue property can be satisfied and the lightweight level of vehicle is improved. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved. Source


Li X.,Jiangsu University | Wang J.,Jiangsu University | Sun J.,Suzhou Sanji Foundry Equipment Co. | Cheng K.,Guangdong Tayo Motorcycle Technology Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2016

The indirect squeeze casting process and working principle of mold were determined based on analysis of the structure of gearbox and forming technology. During the stage of trial-mold, cold sandwich and shrinkage porosity were observed in gearbox produced by vertical squeeze casting machine SCV2000. After optimization of squeeze gearbox mold design, the defects such as cold sandwich and shrinkage porosity near sprue can be eliminated by optimizing structure of sprue bush and adding local pressurization core. Then the microstructures and mechanical properties of gearbox have been investigated. The results reveal that tensile strength, elongation and hardness of gearbox reach up to 317 MPa, 6.1%, 99HBS, respectively, meeting the use requirement. The X-ray flaw detection shows that the aluminum alloy gearbox exhibits satisfy surface quality with absence of shrinkage porosity and cavity, gas hole. © 2016, Journal Office of Special Casting and Nonferrous Alloys. All right reserved. Source


Wu G.Y.,Nanjing Southeast University | Tang W.C.,Nanjing Southeast University | Wan S.P.,Suzhou Sanji Foundry Equipment Co.
Applied Mechanics and Materials | Year: 2014

The research object of this paper is double-toggle clamping mechanism of DC3500 die casting. The theoretical formulas of stroke ratio and force amplification are proposed and the prototype model is established in ADAMS to generate kinematic and mechanical curves. Moreover, experimental values are used to verify the validity of the theoretical formulas and simulation model, and the causes of experimental error are gaven. Thus, the theoretical model can be adopted directly for the design of larger double-toggle clamping mechanism to simplify the design cycle. © (2014) Trans Tech Publications, Switzerland. Source

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