摘要:In this paper, a special casting bronze with high-strength and high-hardness is introduced.Alloy component,melting,pouring, heat treatmant process and some importment property have been developed research. Experiment indicated that the strength and hardness of this alloy approach the beryllium-bronze level and the serious poisoningof beryllium -bronze is overcomed.
摘要:In this paper, the preliminary study of numerical simulatiny method and experimental method of solidification process for centrifugal cast iron pipe are described in detail. The solidification pattern and the form mechanism of casting defects are also studied.
摘要:The effect of modification on the thermal expansion and contraction character of hardened gypsum body has been investigated. It was shown that the obvious shrinkage of gypsum on heating within the range 350400C,i,e.at the stage of III CaSO4 II CaSO4 was reduced greatly by the addition of modifier,Thus, the dimensional stability of piaster mould was improved.The mechanism of modification couH b’ consi lered as that th?- allotro-pic transformations of gypsum at different tempera!: ires were changed adding the modifier.by adding the modifier.
摘要:In this paper, the studies are made on the law of dimensional change of ceramic shell mould in investment casting These ceramic shells are as follows : ethyl silicate shell, colloidal silicate shell, sodium silicate shell and its compound ceramic shell, in which the reinfocement. made of sodium silicate coatiag The results have proved that the dimensional change of ceramic shell are decided by binder, refractory are techaique
摘要:In this paper, the rule of the variety of gases content of Alloy Z1104 in melting process under the production condition of relative humidity of 40% has been Systematically and quantitatively researched by means of SQH-1 type Hydrogen Detector etc.The paper also has discussed the relationship between the gases content in the alloy, the pinhole-grades and the porosity by pouring the sand castings with different structures.
摘要:The additinal stabilizing heat treatment was employed in order to remove the interference which there still exist precipitation of secondary phase that cause volume of the piston unstable during the piston working. The thermal expansion coefficient of eutectic Al-Si alloy piston was measured by laser-interfereatial expander from room temperature to 400C Investigation of the influence of rare earth metals on the thermal exponsion coefficient was also carried. The results demonstrate that the accuracy and reliabity are greatly improved.
摘要:Chill in cast iron occurs when solidification of the grey iron eutectic suppressed, If the suppression occurs after some of the grey iron eutectic has solidified then a mottled structure is obtained. This mottle pattern being now well understood. Traditional specifications for cast rolls calling for certain noble alloys are not correct. Whether or not to include those alloys is viewed a good deal more critically.