最新刊期
      卷 ， 期 6 ， 1999
      • Su Yanqing Guo Jingjie Liu Yuan Ding Hongsheng Jia Jun
        Issue 6, (1999)
        摘要：The activity coefficients in Ti 15 3 melt have been calculated. At 2 000 K,the activity coefficients in Ti 15 3 melt are all less than 1.Taking advantage of the activity coefficients,the evaporation losses of components in Ti 15 3 melt during ISM process have been studied.The calculated results show that there exists a critical vacuum degree during melting process.When the vacuum degree in the vacuum chamber surpasses that value,the evaporation of components takes on a state of free evaporation. A thermodynamic model of dissolution of oxygen in Ti 15 3 alloy is set up and the factors influencing oxygen dissolution are analyzed.The calculation results show that the oxygen partial pressure in the melting chamber is the main factor determining the oxygen dissolution in Ti alloy.A valid method was developed to decrease oxygen content and evaporation of alloy element.The calculated results are in accordance with the experimental results.With the simulation program for ISM process,the relationship between the ultimate temperature in the melt and the melting power,charge weight are set up.The change of the skull shape and size is predicted through the program too.The results show that the skull height and thickness decrease with increasing melting power and the skull is smaller than that remained in crucible after pouring.  
        关键词：Ti 15 3 Alloy;ISM Process;Activity;Interstitial Element;Temperature Field;Skull   
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        发布时间：2023-12-18
      • Zhang Yongzhong Zhang Kui Liu Guojun Zhang Jingxin Fan Jianzhong Xu Jun
        Issue 6, (1999)
        摘要：Combined with the materials used for practical automobile parts,thixoforming process of AlSi10Cu2Mg alloy in semi solid state including billets preparation,partial remelting and thixotropic squeeze casting of connecting rod for air compressor is studied.At the same time,the advantages of this technology in the production of aluminum alloys automobile parts are shown fully.  
        关键词：Semi solid state;AlSi10Cu2Mg Alloy;Partial Remelting;Thixotropic Squeeze Casting   
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        发布时间：2023-12-18
      • Zeng Xiaochun Sun Guoxiong
        Issue 6, (1999)
        摘要：The Influence of polymer on the combustion synthesis process of Al Cr 2O 3 system was studied.The results show that ploymer addition can not only make the ignition of thermite type reaction more easily and accelerate the propagating velocity of combustion wave,but also enhance the temperature of self propagating combustion and change the combustion mode of Al Cr 2O 3 system from oscillating mode to near stable plane mode.  
        关键词：Polymer;Al Cr 2O 3 System;Self propagating Reaction;Ceramic Metal   
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        发布时间：2023-12-18
      • Qi Guanghui Liu Xiangfa Bian Xiufang
        Issue 6, (1999)
        摘要：The mechanism forming snow shaped speckles on worked face of Al Si alloy castings was discovered by analyzing ZL104 and ZL108 alloy castings.The snow shaped speckles usually appear on Al Si alloy with coarse macro grain; microcosmically,due to uneven distribution of hard eutectic.structure and soft α（Al）dendrite grain on the Al Si alloy with first dendrite axis and secondary dendrite arm spacing widely,it is easy to form snow shaped speckles.They can be prevented from appearing by accelerating cooling rate or adding 2% Al5TilB to ZL104 alloy.  
        关键词：Al Si Alloys;Snow shaped Speckles;Macro grain Size;Al5TilB Refiner   
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        发布时间：2023-12-18
      • Ye Shengping Wu Zhichao Fei Hanbing
        Issue 6, (1999)
        摘要：The tools prototype is rapidly made with laminated manufacture method according to 3 D design.Based on the prototype,the aluminum alloy foam molding tools are made by plaster precision casting.The new method can provide small medium size foam tools and polystyrene pattern for lost foam process rapidly.  
        关键词：Rapid Prototyping;Plaster Precision Casting;Lost foam process   
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        发布时间：2023-12-18
      • Yang Xiangjie
        Issue 6, (1999)
        摘要：Influence of vacuum aided process on mechanical properties and microstructure of castings by two kinds of gating systems（fan shaped single runner and branch runner）was discussed.Comparing vacuum with non vacuum conditions,it was shown that vacuum had significant effect on castings by fan shaped single runner gating system but little effect on those by branch runner gating system.  
        关键词：Vacuum;Semi solid state;Tensile Strength;Elongation Rate;Gating System   
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        发布时间：2023-12-18
      • Gao Hongwu Liu Shunhua Zhou Yongjiang Zhou Wenlong Wang Guiqin Li Changmao
        Issue 6, (1999)
        摘要：Refining molten aluminum with Cl 2,Ar,Ar Cl 2 can decrease aluminum resistivity for 0.5%0.6% by reasonable process.For aluminum with B,refined with Ar Cl 2,the resistivity will increase;but with Ar,it can decrease for 0.2%0.4%.  
        关键词：Gas Refinement;Resistivity;Aluminum   
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        发布时间：2023-12-18
      • Li Xiaoping Chen Zhenhua Cao Biao Fu Dingfa
        Issue 6, (1999)
        摘要：Adding solidification powder at various size and addition with the same composition to Al 30Si molten liquid under superheated condition,can generate refined original crystalline Si in alloy.And then a simple and efficient method that can refine original crystalline Si in high Si Al alloy was achieved.  
        关键词：High Si Al Alloy;Suspension Casting;Structure Refinement   
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        发布时间：2023-12-18
      • Hong Shenzhang
        Issue 6, (1999)
        摘要：Adopting extrusion casting instead of pressure die casting to manufacture aluminium alloy wheels could not only eliminate the defects such as gas hole and non metal inclusion in die casting,but also increase the rate of end product and material utilization.Die structure and design parameters of extrusion casting for aluminium alloy wheels were introduced.Technical parameters and selection basis were analyzed.  
        关键词：Aluminium Alloy Wheel;Extrusion Casting;Die Structure   
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        发布时间：2023-12-18
      • Yu Haipeng Zhang Shangzhou Li Rongde Yu Baoyi Sun Litao
        Issue 6, (1999)
        摘要：The effects of two patterns of squeeze casting on mechanical properties of ZA43 alloy were investigated through the analysis of alloy liquid flow and pressure loss.The results show:punch squeeze casting results in converse flow of alloy liquid,which improves solidification condition of ZA43 alloy and avails to eliminate porosity,and makes less pressure loss during the process,while plunger squeeze casting also enhances flow of alloy liquid,but there is no macro flow, and pressure loss is higher. To achieve ZA43 alloy castings with high plasticity,specific pressure of plunger squeeze casting is much higher than that of punch squeez casting  
        关键词：Squeeze Casting;ZA43 Alloy;Mechanical Properties;Specific Pressure   
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        发布时间：2023-12-18
      • Wu Zhenqing
        Issue 6, (1999)
        摘要：The occurrence of hot tearing and distortion of long and thin investment castings and the methods to resolve these defects are introduced .The causes of these defects and corresponding resolving methods are analyzed.  
        关键词：Investment Casting;Hot Tearing;Distortion   
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        发布时间：2023-12-18
      • Ma Jinying
        Issue 6, (1999)
        摘要：The specialities of fosin and paraffin, two main components of meltable pattern materials, are introduced in order to achieve the goal of prolonging service life. The wax should be accord with the requirement of its speciality in using process.  
        关键词：Service Life;Modification;Heat of Vaporization   
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        发布时间：2023-12-18
      • Wang Mingfa Zheng Liming
        Issue 6, (1999)
        摘要：The practice of using residual heat to bathe and bask is introduied. The method is simple and practical with notable economical benefit.  
        关键词：Utilization of Residual Heat;Practical;High Efficiency   
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        发布时间：2023-12-18
      • Liu Ruiling Wang Lijuan
        Issue 6, (1999)
        摘要：A kind of insulating sleeve combined with hollow particles, added insulating material and sodium silicate adhesive is introduced. Test results show that it has the advantages of good insulation effect, long life, low cost and simple making process. It is the substitutor of import insulating sleeve and has widely applied prospect.  
        关键词：Insulating Sleeve;Permanent Mold;Aluminium Alloy Piston   
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        发布时间：2023-12-18
      • Ji Hancheng
        Issue 6, (1999)
        摘要：Formation mechanism of some typical defects, method for overcoming defects and technique of handle by gravity die casting have been analyzed. Three aspects at the die design, alloy melting and technical control should be synthetically considered, fully solved, and then to overcome defects effectively and to improve casting quality and rate of end product.  
        关键词：Handle;Permanent Mold Casting;Defect   
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        发布时间：2023-12-18
      • Liu Wehcnuan Wang Xingping Zhu Juzhang Fan Zhonggen
        Issue 6, (1999)
        摘要：Features and shortcomings of five popular formulas for calculating pouring time in Al, Cu alloy casting product are described. Every formula’s shortcoming in its material range is analyzed. General calculating formula for efficient pouring time of Al Mg alloy and Cu Zn alloy castings respective and their good applicability and wide application range are investigated and expounded respectively.  
        关键词：Non ferrous Metal;Castings;Pouring Time;Efficient Pouring Time   
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        发布时间：2023-12-18
      • Duanmu Guangming
        Issue 6, (1999)
        摘要：There is abnormal bottom shrinkage in Zn Al alloy castings and top riser has little effect on them. The reason causing bottom shrinkage is that gravitational segregation results in unusual composition undercooling, the method to eliminate or ease bottom shrinkage is given.  
        关键词：Zn Al Alloy;Bottom Shrinkage;Composition Undercooling;Gravity Segregation   
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        发布时间：2023-12-18
      • Lai Xihong
        Issue 6, (1999)
        摘要：One method to make casting sand mold directly from the bozzetto（mud draft） of the sculpture is introduced.  
        关键词：Bozzetto（mud draft） of the Sculpture;Copper Sculpture;Direct Method   
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        发布时间：2023-12-18
      • Wang Yizhi
        Issue 6, (1999)
        摘要：Overall requirement for function and properties of water soluble release agent in die casting process was analyzed.Recommended values for spraying parameters were given on the basis of theory and practice,which provided reliable scientific basis for production and improving product quality.  
        关键词：Die Casting;Water Soluble Release Agent;Spraying Parameter   
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        发布时间：2023-12-18
      • Dong Xuanpu Wu Shusen Huang Naiyu
        Issue 6, (1999)
        摘要：The advantages of cosworth process for sustainable development and its features were de- scribed,its future application in China was prospected as well.  
        关键词：Cosworth Process;Aluminum Alloy;Precision Sand Casting;L ow- pressure Sand Casting   
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        发布时间：2023-12-18
      • Issue 6, (1999)
        摘要：细长孔在铸造中历来是一个难题,即使在精密铸造中,要铸出特别细长的孔也是非常困难的。有时,即使能够铸得出来的,但清砂也很不容易。最近,我们在生产中遇到这样一个铸件,其结构如图1所示。材质为SCS2（2Crl3）,细长比为1∶24。图1　细长孔铸件结构图这个铸件,图纸要求必须将...  
          
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        发布时间：2023-12-18
      • Issue 6, (1999)
        摘要：冶金炉用一次性耐火材料打炉,开始逐渐减少,代之以大型水冷金属壁板。如电弧炉,闪速炉,高炉（包括若干种类的沸腾炉）等。电弧炉由过去的全水冷炉盖,发展到炉壁,高炉过去仅风口用紫铜,现在金属炉壁也大量使用。而制作炉壁的材质也开始高级化,由铸铁到紫铜,紫铜优点是导热性?..  
          
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        发布时间：2023-12-18
      • Issue 6, (1999)
        摘要：铝活塞是发动机的关键零件,其性能的好坏直接影响发动机的性能。其表面质量及锈蚀除影响活塞的几何尺寸和外观质量外,也影响结构强度,因此对活塞的内外质量提出了越来越高的要求。在生产中,发现毛坯、在制品及一些成品有锈蚀现象,严重的甚至产生批量废品,造成较大损失。解...  
          
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        发布时间：2023-12-18
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