摘要:Based on the experiments on the thermal analysis cup and the intellectualized instrument,a new thermal analysis technique has been studied out, which can test the modification efficency of Al-Si alloy on the shop floor.Further more,the mean solid growing acceleration E during euntectic nucleation and growth is carried out based on Newton heat transfer equilibrium equation, square root law and equilibrium diagram of Al-Si alloy. It can be used to assess the modification degree of Al-Si alloy. With the value of E small, the modification would be better.
摘要:The factors effecting EPC include unbound sand and its filling, moulding box, pattern & cluster, vibration, vacuum, etc.. It is important to plan correctly the factors for stabilizing process and improving castings.
关键词:EPC;Moulding in Unbound Sand;Vibration;Vacuum;Pull
摘要:Heat plating process of a bimetal of ZA33-3 and steel and its interface characteristic are studied.The results show that two steels pre-streated in fluxing or passivating can be cated with ZA33-3 alloy. The new compounds appear on the interface metallurgically combined as the mutaul diffusion of Fe, Al, Zn and other atoms.
摘要:In this paper an economic continuous melting-degassing furnace for Al alloy was studied with emphasis on its structural character and processing as well as the factors influencing on the quality of melt.The differences in operation between new and conventional furnaces were discussed in details.The melting condition in new furnace is favourable for reducing the oxidization of alloy and avoiding the hydrogen pickup, resulting in a small of amount of master alloy and modifier as well as improving quality of alloys. The electric expense is cut off 85% in comparison with conventional melting system.
摘要:Let fluoride react with superheated aluminium, then add rare-earths to produce a new type of aluminium grain refiner──master alloy of Al-Ti-B-RE. This technology has such characteristics as stable product quality, high productive efficiency, low energy consumption and utilization of its by-product. The continuous casting and rolling method can be used to produce Al-Ti-B-RE refiner rod. It is also stated in this article that Al-Ti-B-RE is a new type of aluminium grain refiner which is different from Al-Ti-B. The grain refinement effect of Al-Ti-B-RE and the function of rare-earths are stated,too.
摘要:Investigation and development of semicontinuous casting of squeeze Al ingotting are introduced in brief.The external trend and internal achievments about hot top casting and its advantages are emphasized.
关键词:Squeeze Al Ingotting;Semi Conticnuous Casting;Hot Top Casting
摘要:The principles and methods testing pattern material are summerized. Their characteristies, results and applicating fields are discussed. The codes of testing methods in China, U. S. A, UK,Japan and other countries are listed.
摘要:This paper summarized the present study status of the new hot working technology of metal materials in the 21th century──semi──solid casting techniques. It mainly reviewed the internal and external developing level about the production of the raw material──non──dendritic stucture alloys for semi-solid casting, the fundamental theory study of semi-solid casting and its industrial application.
摘要:The recent progress of shell moulding process at home and abroad are summerized. The main factors influencing the hot properties especially hot strength and hot toughness, and the methods controlling quality of pre-coated sand are also discussed.
关键词:Shall Molding Process;Pre-coated Sand;Hot Strength and Toughness
摘要:The method of control volume and straights fitting curve are used for computer simulation continuous casting process for roll cladding.In which the criterion of good roll cladding is given. The optimum seeking method are used for selecting main technique. The general design of continuous casting for roll cladding is got. Using the simulation can get the technique of good roll cladding, bleed-out etc.
摘要:The colloidal silica-waterglass complex shell, coated with a colloidal silica-bonded zircon dressing, is used for producing stainless and high alloy steel castings. The surface roughness of them (about Ra 3. 2) are 1~1. 5 grade lower than one of waterglass shell.
摘要:The hub,a important part of Changjiang 750 combination, is wholely produced using low pressure casting. Investigations are made on equipment, pattern, process and preventives of defects. Agood result is obtained adapting some improvements.
摘要:The slag of the low-molecular polyvinyl pattern materials is researched. An expectant reclamation is got through a series of experiments. The low-molecular polyvinyl pattern material without soaponification is shown.