最新刊期
卷 ， 期 S1 ， 1998
- 摘要：The microstructure of Al-24%Si alloy with electromagnetic stirring has been studied. The results show that: Primary Si phase can be broken by the stirring, and the broken Si fragments have a coalescent tendency. During non-equilibrium solidification, a phase can also be broken and the broken a phase particles appears as round particle. There is a rich Si layer at the surface of the sample.关键词：Electromagnetic Stirring;Hyperutectic Al-Si Alloy;Microstructure
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发布时间：2023-12-18 - 摘要：The effects of Ce and Y additions on the as-cast microstructure and the mechanical properties of AlZnMgCu alloy have been investigated. The results show that the arm space of the as-cast secondary dendrite and the dimension of the maximum eutectic compound are decreased with adding Ce and Y. The additions of Ce and Y may reduce the ageing strength and ageing hardness of AlZnMgCu alloy. But a small amount of Ce and Y can effectively improve the alloy’s impact toughness.关键词：Aluminium Alloy;Rare Earth;As-Cast Microstructure;Mechanical Property
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发布时间：2023-12-18 - 摘要：The way of controlling the temperature of diccasting dies by water cooling is studied and applied in this article on thermal analysis method and thermal conduction principle. A series of design skills and calculation formulas about cooling bore of the dies are summarized, and several computing examples are listed. The way results in good effect on casting density, productivity, die longevity.
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发布时间：2023-12-18 - 摘要：The die casting method of producing BW-120/10 slurry bump worm wheel has been introduced. The metallographic structure and the mechanic properties of the products have been analyzed. It shows that the die casting method instead of the old gravity casting method has many advantages such as improving the properties, reducing the cost and increasing the productivity.
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发布时间：2023-12-18 - 摘要：The die for die casting with many side holes is alwasys very complex because it has many cores to be drawn out, so everything in its design must be considered very carefully to simplify the structure of the die, thus to avoid the problem in use. Considering the problems of simplifying the structure of castings, drawing-out cores by large angle in stationary mould, drawing-out cores through an inside block in moving mould, drawing-out cores with a long distance, the design in this paper makes the complex die have high reliability.关键词：Casting with Many Side Holes;Die Casting Die;Core Drawing-out
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发布时间：2023-12-18 - 摘要：Introduced the failure types and some measures for extending service life of die casting die.
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发布时间：2023-12-18 - 摘要：Compared the service life of aluminium alloy die casting mould made of 3Cr2W8V and H13 steel and discussed the relation between the machineability, heat fatigue-resisting. heat treatment process of the die and it’s service life.
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发布时间：2023-12-18 - 摘要：Magnesium alloys are excellent materials for die castings, but they must be processed correctly before their significant advantages can be realized. Magnesium die casting alloys are light-weight and offer designers a wide varity of possible applications. This paper described magnesium alloy charc-teristics, and dicussed the effects of storage, melting, refining of the alloys, cast process and dies on the production of high quality magnesium die castings.
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发布时间：2023-12-18 -
Several Technological Problems about Low Pressure Cast with Metal Mould for Large Aluminium Castings
摘要：The kernel of discusion on several technological problems about low pressure cast withmetal mould for large aluminium castings is how to bring advantages of crystallization under pressure into play. To reach this goal, the specification of the structure of castings, the design of cast technology, the choice of technological parameters and the design of components of melt lifting system are introduced.关键词：Large Aluminium Casting;Low Pressure Cast with Metal Mould;Crystallization Under Pressure- 2
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发布时间：2023-12-18 - 摘要：To avoid the defects such as shrinkage cavity and porosity, we adopted partial squeeze treatment in gravity die casting. It could refine the crystal grain and also improve compactness as well as increase strength and hardness of the components. This is an advanced technical process to compensate the defectts of permanent mould cast components.关键词：Mg-Alloys;Permanent Mould Casting;Hot Spot;Squeeze
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发布时间：2023-12-18 - 摘要：<正>1.1998年7月 保定 内燃机铸造生产技术经验交流会 2.1998年8月末9月初 哈尔滨 ’98全国喷射成形技术研讨会 3.1998年9月 中国铸造学会实型铸造专业委员会第四次会议 4.1998年10月 宜昌 21世纪铸造技术论坛 5.1998年10月 上海 ’98有色及特种铸造国
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发布时间：2023-12-18 - 摘要：The nature of squeeze casting and it’s characteristic of formation are described. Combined with the production of worm plates for automobile air-conditioner compressors, the exact procedure and paramenters of squeeze casting are discussed.
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发布时间：2023-12-18 - 摘要：This article elaborates the successful use of quickly adding supplement pressure technology from theory to practice which is used in the counter——pressure cast process. According to the principle of conter-pressure cast and on the bae of traditional steady pressure crystal technology, aiming at the improvement of its disadvantages, the article advances a new concept that is quickly adding supplement pressure technology used in the counter-pressure cast process. The effects of the technology on eliminating cast defecats and changing the solidification process and the structure of the alloy are theoretically analysed and technically tested. When the technology adapts 0. 002-0. 003 5 MPa/s as the rate of increasing pressure and 0. 08-0.12 MPa as the crystal pressure, the finished-product-rate of castings may be arrived more than 85% and the combining mechanical properties can be advanced 9%. The result shows that the technology has a notable effect to advance the quality of castings.
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发布时间：2023-12-18 - 摘要：Based on fuzzy control, rule-adaptive fuzzy control and integral algorithm analysis, thefilling control system of low pressure die casting is simulated. The simulation results show that the rule-adaptive fuzzy control has better static and dynamic performances, and follows filling curves very well and adapts to the changes of process parameters. Steady state error is eliminated and high overshoot is prevented by adopting integral separation algorithm with integral of the continuous value of the error. The proposed control scheme by combining on-line rule-adaptive algorithm and integral separation algorithm provides an effective solution to the control of low-pressure die casting filling system.
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发布时间：2023-12-18 - 摘要：Viewing from the history of Mg-die casting, it may be sure predicted that 21st century may be make great progress especially in automotive industry in our country. About the key technology of Mg-die casting, the author explained and analyzed briefly in one after another and suggest to how will be overtake the advanced level in our home land.
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发布时间：2023-12-18 - 摘要：In this paper, die structure and design parameters, techno-economic analysis of squeeze casting for the aluminium alloy oil pump body were introduced. When the aluminium alloy oil pump body were manufactured with squeeze casting replacing die casting under pressure and hot die forging, not only were the defects as gas holes and non-metal inclusion in the die casting eliminated, but also the investment for hot die forging were decreased and the coefficient of material utilization were increased.
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发布时间：2023-12-18 - 摘要：The formation of the flashes in die casting processing are analysed, and the ways to reduce the flashes and improve the accuracy of diecastings are presented. To reduce the flash, it is necessary to make the center of locking force of the die casting machine in line with the center of opening force resulted from injection pressure as much as possible, to increase the rigid of the mould, including increasing the thickness of the platens appropriately, utilizing the solid enclosed bolster and supporting pillars, and to keep the parting surface clean and reasonable allowance during operation.关键词：Flash;Diecasting;Accuracy
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发布时间：2023-12-18 - 摘要：Introduced recent years activities of die casting industry on the basis of investigation and research of Guangdong die casting production, and discuss the present situation and the developing trend of die casting manufacture of Guangdon. The successes of the die casting industry in Guangdong have attracted the attention of the world.
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发布时间：2023-12-18 - 摘要：The basic contents of major papers of the International Conference on "Die Casting & Toolmaking Technology" are briefly commented, including: melting equipment, die casting and die design, software package for die cast proceeding, die material and technology.
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发布时间：2023-12-18 - 摘要：Introduces construction characteristic of four main components-----pump, power supply,piping and control systems of new molten metal delivery system for cold chamber die casting machine. The pump body primarily consists of two concentric refractory cylinders, and has not moving parts. The power is a 1 200 Hz single-phase unit. The piping system consists of a steel outer pipe and two concentric refractory liners, and is heated seperatly by the single-phase 110 V power in five zones. Control system has four main components: the programmable logic controller （PLC）, the pumping system, metal level sensor and the piping system. The key innovation of the control system is the level sensor. Using this delivery system, the melt is not expose to air, and produced castings will benefit from a dramatic reduction in oxide formation and absorption of hydrogen.
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发布时间：2023-12-18 - 摘要：Describes the characteristic of HVSC-8 000 kN extrusion cast machine, the structure of the extrusion mould and the casting technology.
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发布时间：2023-12-18 - 摘要：<正>实时闭环压射监控技术发展至今,已走过了相当长的时间,在该技术领域保持领先地位的美国Tymac控制系统公司,开发研制的实时闭环压射监控系统,以其独树一帜的优越特性,必将得到中国压铸界同仁的认可与喜爱,为中国压铸工业的进步做出贡献。 Tymac公司的压射监控系统和压射机构的主要特点,是可以对压铸生产进行全过程的实时闭环控制,这可以从其对压射过程进行的七阶段实时速度控制充分体现出来。这七个阶段是:1.阀启动;2.关闭浇口;3.慢行;4.快速压射;5.低冲击;6.最后填充;7.最后充
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发布时间：2023-12-18 - 摘要：<正>压铸模不仅使流入型腔内的金属得到一定的填充形状,而且还要使金属液凝固,顶出时不变形。压铸模温度直接影响着型腔的填充、模具使用寿命和压铸件质量。低的模具温度可以提高生产效率,可以使模具承受大的型腔压力,铸件组织也很致密,然而模具要承受高温金属液的冲击,使模具变形,使铸件形成收缩裂纹和“花纹”;高的模具温度又会使压铸材料粘模。这就要求模具有一个适合压铸生产的最佳温度（常用压铸合金的最佳模具温度如附表1）,由于模具的吸热和散热,要使模具在理想的温度下工作,就必须对模具进行预热、加
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发布时间：2023-12-18 - 摘要：<正>J1125型压铸机采用的是电气液压联合控制操作系统,具有液压中心顶出,其行程为定值且不可调节。该结构对顶出距离经常需要调整的模具,在使用上很不方便。为满足某些特殊要求,如为防止滑块在合模过程中与顶杆发生干涉现象,通常在压铸模设计中采用顶杆预复位结构。该结构有各种型式,但大多较为复杂。 实践证明,为了简化模具设计、减小体积、方便制造,采用模具中心预复位结构是最简便易行的方法。该工作过程是靠一个特殊拉杆,使机床中心顶出活塞与模具顶杆压板进行合理连接来完成,其顶出与复位动作迅速、准确、可靠。该机构可通过在模具型体外侧加装限位
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发布时间：2023-12-18
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