Effects of process parameters on semi-solid squeeze casting performance of aluminum alloy scrolls for scroll compressors
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https://doi.org/10.1007/s41230-020-0028-0
Effects of process parameters on semi-solid squeeze casting performance of aluminum alloy scrolls for scroll compressors Yong-fei Wang1, 2, Sheng-dun Zhao1, *Yi Guo3, Jun-ling Yang4 1. School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China 2. State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China, 3. School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China 4. CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Beijing 100190, China
Abstract: The aluminum alloy scroll is one of the key parts of the scroll compressors widely used in the air-conditioning, refrigeration, and heat pump systems. In this work, the semi-solid squeeze casting (SSSC) process was used to fabricate the aluminum alloy scroll. The effects of process parameters including the pouring temperature, mold temperature, and squeezing velocity on the filling and solidification behaviors of the alloys were investigated through simulations based on the power law cut-off (PLCO) material model. Results show that there is a significant increase in the flow velocity of the slurry, and the area of the high-speed region enlarges with the increase of the pouring temperature. The homogeneity of the temperature and velocity fields in the slurry is improved with an increase in mold temperature. Both the filling time and its variation rate decrease with an increase in squeezing velocity. The maximum solidification time exhibits a linear variation with the increase in pouring temperature. The shrinkage area is decreased by increasing the mold temperature. The optimal process parameters of the SSSC process were obtained from simulation analysis, which are the pouring temperature of 595 °C, mold temperature of 350 °C, and squeezing velocity of 0.3 m·s-1. Moreover, the qualified scroll casting was fabricated using the SSSC process under the optimal process parameters. Key words: semi-solid squeeze casting; aluminum alloy; scroll compressor; numerical simulation; experimental verification
CLC numbers: TG146.21
Document code: A
S
croll compressors are widely used in air-conditioning, refrigeration, and heat pump systems [1] due to their advantages such as high volumetric efficiency, low vibration and noise, low torque variation, and low leakage [2]. They are also proposed to be applied in energy storage [3] and fuel cell systems [4] because of their excellent compression performance. A scroll compressor is a positive displacement machine which compresses the working fluid by two interfitting scrolls. The choice of manufacturing method is crucial for the scrolls due to the complex shape with involute curves [5]. The scroll for a typical refrigeration scroll compressor is generally fabricated by hot forging and machining processes. These *Yi Guo Female, born in 1986, Ph.D., Associate Professor. Her research interests mainly focus on the design, manufacturing, semi-solid metal forming, and numeric
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