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Ma C.,Huazhong University of Science and Technology | Wan L.,Huazhong University of Science and Technology | Wan L.,Guangdong Hongtu Technology Co. | Lu X.,Huazhong University of Science and Technology | And 3 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2014

A multi-directional vacuum system based on IPC and PLC was developed, which exhausted from mold cavity, sleeve and die carrier. The system consists of hydraulic vacuum valve and vacuum system controlled by IPC and PLC. The results show that the hydraulic vacuum valve has the features of simple, easily maintenance and high reliability. The vacuum system based on IPC-PLC method possesses some functions such as detection of vacuum level and moisture as well as some shot parameters including velocity, pressure and stroke. Meanwhile, real-time curves of above parameters can be shown. High vacuum die casting with multi-way venting has the advantages of fast venting, powerful data-processing capacity. Source


Zhang B.,Guangdong Hongtu Technology Co. | Jia C.,Chongqing University | Li L.,Chongqing Changan Automobile Co. | Cao H.,Chongqing University
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015

The change of Si, Cu distribution in vacuum HPDC Al-Si-Cu alloys samples (50% vacuum degree) with solution treated at different time was observed and analyzed by optical microscope, SEM, EDS, XRD. Results indicate that Si phase in the vacuum HPDC samples with solution treated 2 h at 500 ℃ has satisfied size and distribution morphology and surface blister is less than 100 μm. The finer eutectic Si particle can be generated in the vacuum HPDC samples compared with common HPDC samples. After solution treated at 500 ℃ for 0.5 h, Cu elements are dissolved into matrix partly to be homogenized, then its distribution is related with Si phase change. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved. Source


Zhang B.,Guangdong Hongtu Technology Co. | Jia C.,Chongqing University | Li L.,Chongqing Changan Automobile Co. | Han J.,Chongqing Changan Automobile Co. | Cao H.,Chongqing University
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015

The Magma software was used to predict the gas pressure in vacuum die casting filling process and gas entrapment in vacuum die casting engine cylinder block. Through the microstructure observation, CT scanning, mechanical properties test and density measurement, influences of the vacuum die casting on engine cylinder block casting quality was analyzed to understand effects of density on properties of engine block. The results reveal that the vacuum can reduce the gas pressure inside the cavity during filling process and improve gas entrapment, meanwhile, the vacuum die casting process can reduce the porosity in die castings, improving structure density and the casting properties effectively. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved. Source


Wang W.,Guangdong Hongtu Technology Co. | Wan L.,Huazhong University of Science and Technology | Huang Z.,Guangdong Hongtu Technology Co. | Chen L.,Guangdong Hongtu Technology Co. | And 2 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2010

There exist different die casting defects in different aluminum alloy castings with obviously different size and structure which are formed in one die during die casting process. Originations of different defects were analyzed by taking into account for pouring, processing parameters and die design, and modified countermeasures were presented. Practical production verifies that the confliction of shooting parameters should be avoided as possible in die casting parts with large difference in size in one die. It is the key parameters for obtaining high quality die casting parts by balancing die temperature. Source


Zhaoyong A.,Guangdong Hongtu Technology Co. | Li W.,Guangdong Hongtu Technology Co. | Li W.,Huazhong University of Science and Technology | Zhiyuan H.,Guangdong Hongtu Technology Co. | And 3 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2010

Injection punch heads as a key assistant part in die casting machine, its service lif directly affected the manufacturing efficiency and cost. A new intermittent cooling method was presented for the injection punch heads made by HT200. Effects of tolerance and cooling time on service life of the injection punch heads were analyzed. The results reveal that service life of the heads is closely related to the tolerance and cooling time. The punch heads exhibits a longer service life with tolerance at 0. 08-0.16 mm. Furthermore, service life of the HT200 punch heads can reach up to 1600 times under the optimized tolerance of 0. 08-0. 16 mm and cooling time of 35 s. Source

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