最新刊期
卷 ， 期 5 ， 2001
- 摘要：The properties of semi solid slurry of AlSi7Mg alloy are improved remarkably by thixoforming and heat treatment. Using electron microscope, SEM and electron drawing equipment, the microstructure and properties of semi\|solid slurry ingot and reheated T6 heat treated AlSi7Mg alloy prepared in liquidus semi continuous casting were studied. The results showed that the precipitation phase in microstructure of AlSi7Mg by thixoforming and heat treatment is composed of Al 3Si, AlSi. σ b and δ 5 were 290.2 MPa and 12.9% respectively.关键词：AlSi7Mg Alloy;Liquidus Semi continuous Casting;Thixoforming
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发布时间：2023-12-18 - 摘要：The preparation and direct rolling test of semi solid rheological slurry of 1Cr18Ni9Ti stainless steel were conducted using self designed equipment. The results showed that solid phase particles of the primary austensite with the size of 100～ 200 μm in 1Cr18Ni9Ti stainless steel rheological slurry have near sphere shape and the solid fraction of the rheological slurry is 50%～60%. The rheological slurry has better fluidity. The segregation of liquid phase and plastic deformation of some solid particles in the slurry occur during direct semi solid rolling.关键词：Semi solid Forming;Stainless Steel;Solidification;Rolling;Rheological Slurry
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发布时间：2023-12-18 - 摘要：The effects of coating constituent, coating layer thickness, permeability and temperature on transfer behavior of polystyrene thermal degradation product through coating layer have been studied. The results showed that the peak value and time in the transfer curve decrease with the increase of the diatomite addition while the result is just contrary to the increase of mica powder addition. With the increase of coating layer thickness and the decrease of permeability, the peak values and time increase. The influence of the transfer behavior of the pattern thermal degradation product through coating layer on porosity in aluminum alloy casting in lost foam casting was approached. The results showed that high peak value and long transfer time are helpful to decrease the porosity in the aluminum casting.关键词：Aluminum Alloy;Lost Foam Casting;Thermal Degradation Products;Transfer Behavior
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发布时间：2023-12-18 - 摘要：The test and comparative analysis of the rheology properties of 3-3-3-1 wax in China and U.S waxes were conducted. The results showed that some parameters, including dimension of injecting ingate, injecting pressure, wax and mold temperatures, should be selected in terms of the rheology properties of different waxes.关键词：Wax;Rheology;Viscosity
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发布时间：2023-12-18 - 摘要：Structure, constituent, micro hardness, shear stress of transition layer of aluminum\|steel bimetal were investigated. Influence of some factors, including plating layer, immersed aluminum melt composition and immersed aluminum time on transition layer quality was studied. It was showed that thickness of T5 heat treated interface transition layer increased and shear strength decreased, which offered theoretical base for the research of aluminum steel bimetal composite castings and laid a foundation for production.关键词：Aluminum-steel;Bimetal;Transition Layer
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发布时间：2023-12-18 - 摘要：Microstructure and properties of repaired welding area in large aluminum alloy ZL114A castings by MIG（Metal Inertia Gas） welding technology were studied. The results of metallographical observation showed that there has the existence of eutectic remelting microstructure in heat effected area near the melting line. Mg 2Si in matrix diffused into the remelting eutectic microstructure; solid dissolved Mg 2Si in matrix in heat effected area far from remelting line was overaged, resulting in matrix softening and hardness decrease. T1 heat treatment couldn’t eliminate remelted eutectic microstructure and matrix softening, so that the mechanical properties of the heat effected area is slightly decreased by 10%.关键词：ZL114A alloy;MIG;Mechanical Properties
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发布时间：2023-12-18 - 摘要：It is necessary to be much higher pouring temperature for aluminum alloy in lost foam casting than in empty cavity process. Under the pouring temperature at 760 ℃, the pin hole tendency in casting with single Sr modification is higher in the period of holding time less than 20 min while the pin hole tendency in castings with single RE modification by larger addition is low in the period of holding time up to 35～40 min. Compound modification of aluminum melt with both Sr and RE has the advantages of good modified effect, e.g. low casting pin hole tendency and small modifier addition.关键词：RE;Modification;Refinement
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发布时间：2023-12-18 - 摘要：Influence of Zn and Al contents on the density, microstructure and properties of high Zn Mg alloy was investigated. The kindling point of Mg alloy with Zn 20%～25% and Al 5%～10% is more than 740 ℃ and density of the Mg alloy is approximately 2.2g/cm 3. Conventional casting technology could be adopted to produce the Mg alloy casting with tensile strength 145～164 MPa.关键词：Mg Alloy;Zn Mg Alloy;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Computer software process system for calculating solid fraction in non dendritic semi solid structure component was developed using computer image recognition technique. It is indicated that the software has the features of clear interface, simplified operation and ideal applied effect. The error of the system is less than 1% through comparative verification.关键词：Non dendrite;Solid Fraction;Image Recognition
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发布时间：2023-12-18 - 摘要：D program for simulating temperature field was developed. The solidification process of piston casting in metal mold with different interface heat exchange coefficients（ h ） was simulated. The results showed that the interface heat exchange coefficient has great effect on solidification rate in metal mold, and could be used as a control factor in adjusting solidification. And the significance of relevant calculation was expounded in comparison with practical pouring result.关键词：Metal Mold;Numerical Simulation;Interface Heat Exchange Coefficien
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发布时间：2023-12-18 - 摘要：The mathematical model for solidification process simulation in sand lined metal mold was established. The shrinkage defect of S.G.iron castings were predicted by dynamic expansion and contraction accumulation method （DECAM） and criterion of K·G/R . The simulation calculation for new S.G.iron four cylinder crankshaft was conducted using the model. Based on the simulation results, the initial technology was optimized and the sound casting has been produced in practical production. It was showed that it is helpful to improving casting quality, shortening trial production period, and decreasing tool cost through numerical simulation and process optimization for S.G iron casting in sand lined metal mold.关键词：Solidification Simulation;Shrinkage Defect;Sand Lined Metal Mold
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发布时间：2023-12-18 - 摘要：The present application status of continuous and pulse electric current during metal solidification process was surveyed. The key mechanism of the electric current effect on the metal solidification process was summarized and analyzed theoretically. The prospects of application and investigation of the electric current during the solidification were discussed.关键词：Continuous Electric Current;Pulse Electric Current;Metal Solidification
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- 373
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发布时间：2023-12-18 - 摘要：Two of three kinds modifier for aluminum alloy was mainly introduced.AlTiB modification effect has related to production method in first kind modifier;various Sr adding method and their modification effects have been introduced in second kind modifier.The charge treatment involves heredity of raw material and iron removal.关键词：Aluminum Alloy Melt;Refinement;Modification;Charge Treatment
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发布时间：2023-12-18 - 摘要：The rapid development of China’s investment casting industry occurred in the latest decade. The production volume and output value of castings increased approximately by 4 times and 10.5 times repectively. The present status of technique, quality and market of investment casting in China was analyzed.关键词：Investment Casting;Casting Market;Casting Export
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发布时间：2023-12-18 - 摘要：The production volume percentage of non ferrous casting in the total tonnage of all castings reflects the production level and technology of the automotive industry of a country in question. This percentage in China,however, is much lower than in industrialized countries, which implies that China has greatly developing aspects in this sector. In addition to the anticipated rapid development of Chinese automotive industry in the first decade of the 21 st century, the trend of weight enlightenment of various products will spur the increase of light alloy casting production in China, of which Mg alloy casting will be in the lead. New technologies will be applied. Automatic molding lines in green sand will be installed in many non ferrous foundries. Chinese non ferrous casting market has a brilliant future ahead.关键词：Light Metal Casting;Robots;Calcined Fluid Coke
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发布时间：2023-12-18 - 摘要：Cu Cr alloy bar with axial fibre column crystal structure was prepared successfully by continuous unidirectional solidification device. The shape, height of crystallizer and the gap between crystallizer and drawn bar were optimized through adjusting process parameters during experimental procedure. The results showed that the Cu Cr alloy bar with excellent surface quality was produced using the optimized crystallizer.
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- 131
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发布时间：2023-12-18 - 摘要：Combining rapid prototyping with transferred coating precision casting, a rapidly manufacturing method for complicated curved metal die was developed. The process was divided into four steps: first,designing the die using 3D software; second,making die prototyping by laminated object manufacturing（LOM）; thirdly, spraying transferred coating directly on LOM pattern; finally,forming metal die with near net shape. The process has the features of short time and low cost, especially suitable for the rapid manufacturing of small size die in sand casting or lost foam casting.关键词：Rapid Prototype Manufacturing;Transferred Coating;Metal Die
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- 141
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发布时间：2023-12-18 - 摘要：Real time injection control system of die casting machine was expounded in all its aspects. The initiation of real time control thought from the key factors influencing casting quality was introduced, and then the essential content of real time injection control system was expounded. The real effect of the system on qualified die casting was expounded also. Some attentions in practical production were proposed.关键词：Servo Control System;Real Time Injection;Technological Parameters;Injection Curve
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发布时间：2023-12-18 - 摘要：The development of die cast aluminum alloy process for JH70 hand brake was introduced and the improvement of die cast process was conducted. Surface anodic oxidization technology, machining process and assembly were introduced briefly.关键词：Aluminum Alloy;Die Casting;JH70 Hand brake
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发布时间：2023-12-18 - 摘要：A concrete analysis of minimum allowance of investment casting in practical production was made. The method to determine the allowance design value and the machining plane dimension of casting was expounded in detail, and the example was given.关键词：Investment Casting;Allowance;Casting Dimension
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发布时间：2023-12-18 -
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