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Generation and Prevention of Subcutaneous Porosity in Ductile Iron Castings Produced by Tidal Coal Powder Sand
Subcutaneous porosity is the most common casting defect in the production of ductile iron castings, especially thin and small castings. The causes and how to prevent it are for reference.
2012
09-29
Expert Team Honor
Expert Team Honor National Science and Technology Achievement Certificate China Automobile Industry Third Prize Selected in 21st Century Talent Pool Engineering World Excellent Patent Technology Selection
09-28
Efficient and Long-lasting Compound Inoculant for Cast Iron
(1) In modern cast iron production, inoculation treatment is an extremely important process link. The purpose of inoculation treatment is to eliminate white mouth, improve processing performance, refine eutectic group, promote A- type graphite, make graphite thicker and shorter, end blunt, shape deformation and bending, uniform distribution of graphite, improve body structure, improve mechanical properties, reduce section sensitivity, etc. For ductile iron, it is to refine the graphite ball while refining the eutectic group, the number of balls increases, the ball diameter becomes smaller, the roundness is improved, the spheroidization level is improved, the body organization is improved, and the comprehensive performance of the ductile iron is improved. Improper handling of cast iron inoculation will also produce some side effects:
"GGG40 cast ball ink casting performance test research and production test"
In the 1980 s, all kinds of casting research institutes and schools all over the country organized casting experts to devote themselves to the research and experimental research of cast high toughness ferrite ductile iron. At that time, the newly established China Heavy Duty Truck Group Company imported more than 85% of the castings of Austrian STEYR heavy duty trucks from Germany standard DINGGG40 ductile iron (equivalent to the new national standards GB and QT400-15). In order to make STEYR heavy duty trucks localized, China Heavy Duty Truck Group Company gave Shaanxi Heavy Duty Truck the scientific research task of jointly developing and producing cast GGG40 in cooperation with Xi 'an Jiaotong University. At that time, Shaanxi Heavy Duty Truck
New base construction begins!
Quality Inspection Center
(1) Central Laboratory:
09-27
Introduction of Special Alloy Research Institute
The company has a group of professors, doctors and masters, including the People's Republic of China Zhongyou Special Alloy Research Institute, which is composed of discipline leaders Guo Xuefeng's doctoral supervisor and Professor Meng Weiru, as well as 100kg and 150kg intermediate frequency electric furnaces, metallographic and performance laboratories, and Pu Dequan High-tech, who developed GGG40(QT400-18) cast ductile iron in 89 and won the "National Science and Technology Achievement Certificate" issued by the State Science and Technology Commission of Shaanxi in 1992 by the Ministry, specialized in high quality special alloy and low temperature -40 ℃,-50 ℃ and other high toughness cast ferrite ductile iron, QT400
Introduction to the Expert Team
Lu Wenhua Company's distinguished senior consultant was former chairman of the Foundry Society of Shaanxi Mechanical Engineering Society and winner of the 2012 "China Foundry Outstanding Contribution Award". His scientific research achievements include the research on horizontal continuous casting equipment, process and microstructure of rare earth magnesium ductile iron profiles. He won the first prize for scientific and technological progress of the Ministry of Machinery and Electronics and the second prize for national scientific and technological progress. New technology to improve the wear resistance of high chromium cast iron; Won the fourth prize of PZZM flat disc mill, won the second prize of scientific and technological achievements of Shaanxi Provincial People's Government. The third prize of the Ministry of Power Industry; the wear mechanism and alloying of high chromium cast iron, won the third prize of the Ministry of Machinery Science and Technology. already
2010
09-19
