摘要:A comprehensive study on investment casting with cold shell moid has been carried out. The results show that pouring in the cold shell mold has the advantage of preventing decarburization at the surface of both plain and low alloy carbon steels, and therefore the positive effect of increasing the surface hardness of castings. This method can also minimize or prevent the chemical burn-on defect of steel castings.In present study the temperature distribution in the shell after pouring has been measured, the regularity of temperature and internal stress changes in the cold shell as well as their effect on the mold strength have been analysed. The mechanism of chemical burn on defect of steel castings is there after investigated.
摘要:In this paper a new type CB wash which is superior in insulating and technological qualities and with similar Properties as wash from Germany has been investigated. The CB wash can be used to produce as-cast centrifugal ductile iron pipes by heated mold method.
The Neimenggu Polytechnic Institute Cao Hao Lin Wang Ji
Issue 6, Pages: 12-15(1988)
摘要:The relationship among inner channel defect grapbitizing expesion, and inner crystallizer deformataon was investigatad by measuring inner crystallizer deformation, and it is pointed out why the inner channel is presented, and where it is located, therefore, the reason for measurem-ents of reducing the inner channel is represented.
摘要:The experiments have been carried out on commerially pure cast Al-Si alloys It showed that addition of K affects both nucleution and growth of the Si phase. The solidification type of eutectic Al-Si changes from endogenous to exogenous by addition of K. The distribution of potassium has been found in Al-Si alloys by EPMA.
摘要:In this paper, it is described how to choose the exothermic agent for the riser of aluminium alloy castings. At the same time, it points out the effect of the composition of exothermic agent on its properties. The experiments and practical applications show that the exothermic agent used decreases the volume of the riser more than half. This agent has a lot of advantages such as abundant raw materials, good combustibility, easy use and less rate of absorbing moisture etc.
Harbin University of Science and Technology GaoZhong-Lian Yian Cheng-Bin Pan Xian-RongHarbin Movie Mochinery Plant Jin Rong-Gui Sun Shang-Xi Ma Xiao-Min
Issue 6, Pages: 24-27(1988)
摘要:This article compendiously introduces the usage, construction, principle of the device, the date of some experiments and calculated result. It narrates the relation between the kind of paint, the area of the gate, etc and the gas content of die castings. At the same time, we have determined the gas content of die castings, the gating system, over flow vell and biscuits and compared them.