搜索结果: 106-120 共查到“知识库 铸造工艺与设备”相关记录263条 . 查询时间(2.792 秒)
灰铁凝固过程中缩孔缩松的预测
灰铁 凝固 缩孔缩松
2008/8/1
通过热分析实验及对灰铁试件的浇注实验，分析了碳当量及孕育对灰铁凝固过程的影响. 在动态膨胀叠加法的基础上，综合考虑了初始温度、碳当量、孕育、初晶和共晶体积的收缩与膨胀，建立了灰铁缩孔预测模型. 开发了灰铁凝固过程数值模拟分析系统，并对实际的灰铁浇注件进行验证分析，预测结果与实验结果吻合较好.
侧向凝固通道偏析的数值模拟
凝固 通道偏析 数值模拟
2008/8/1
建立了二元系凝固过程通道偏析形成的数学模型，给出了描述焓与温度及固相分数耦合关系的表达式. 在实验验证的基础上，对亚共晶与过共晶成分的NH4Cl-H2O侧向凝固通道偏析的形成位置与生长方向进行了数值模拟研究. 模拟计算结果表明，偏析通道起源于糊状区，偏析通道中的富集溶质从糊状区流向液相区. 为了维持偏析通道中的液体流动，枝晶间液体可通过糊状区从液相区得到补充. 糊状区中富集溶质的流动方向取决于析出...
Cu-13.5%Sn合金雾化液滴凝固过程模拟
Cu-13.5%Sn合金 喷射成形 群体动力学
2008/8/1
在群体动力学的基础上，提出了描述Cu-13.5%Sn(质量分数)合金雾化液滴凝固过程的动力学模型; 并将其与液滴的传热方程和运动方程相耦合，对雾化液滴的冷却凝固过程进行了模拟分析，探讨了液滴尺寸、气体初始速度、熔体过热度和初生相与异质形核基底间润湿角对液滴凝固行为的影响. 模拟结果表明：本模型能够很好地描述雾化液滴的凝固过程; 液滴冷却至一定温度开始形核，随后晶粒长大；液滴直径越小，冷却速度越快，...
用数值计算技术和试错法确定金属材料表面对激光的吸收率
激光表面加工 吸收率 数值计算
2008/7/31
提出了一种激光重熔条件下确定金属材料激光吸收率的方法.通过改变输出功率,控制试样表面状态,利用计算机数据采集系统对激光表面重熔的试样进行定点温度采集;按不同表面状态假定材料对激光的吸收率,采用经过验证的激光表面重熔数值模拟程序计算温度场并与实测结果对比,以试错法修正所假定的吸收率,确定了DL31合金表面对激光的吸收率.与文献中实验得到的吸收率值较为接近.用所测吸收率值计算不同功率条件下试样定点温度...
Microstructure quantitative analysis of aluminum skeleton castings
Skeleton casting Core AlSi alloy Microstructure
2011/3/17
In this article authors showed method for manufacturing of closed skeleton castings with hypo – eutectic and eutectic aluminium alloys.
大型涡轮增压器铸件研制
涡轮增压器 铸件 芯撑试验
2008/7/28
该项目在大型涡轮增压器铸造过程中，通过特殊的芯撑试验，解决了砂芯变形导致的皮薄问题，满足9～14mm壁厚要求，保证了芯撑熔合好、水压无渗漏。项目在生产砂层厚度20～30mm的内腔水套芯芯骨方面有创新。项目部分铸件为高屈强比（0.8）、铁素体基体（≥80%）的高硅钼球墨铸铁，力学性能要求高，在国标中无对应牌号，研制的材料达到了国外产品的材料要求。产品国内外市场空间大，附加值高。
Mechanical properties of investment casting moulds reinforced with ceramic fibre
Investment casting Ceramic mould Modulus of rupture
2011/3/17
This work deals with mechanical properties of thin-walled ceramic moulds for investment casting at the dewaxing stage. The main purpose of this work has been increasing their bending strength, express...
Water mist effect on cooling range and efficiency of casting die
Innovative materials and casting technologies Cooling Water mist Die Silumin
2011/3/17
This project is showing investigation results of cooling process of casting die in the temperature range 570÷100 °C with 0.40 MPa compressed air and water mist streamed under pressure 0.25÷0.45 MPa in...
CastML – a language for description of casting products and processes
Application of information technology to the foundry industry XML
2011/3/17
This work presents CastML – an XML dialect for description of casting products and processes. CastML is extension of MatML which is an extensible markup language designed specifically for the exchange...
Anodization of cast aluminium alloys produced by different casting methods
Aluminium cast alloys Mechanical properties Surface treatment Alumina layer Anodizat
2011/3/17
In this paper the usability of two casting methods, of sand and high pressure cast for the anodization of AlSi12 and AlSi9Cu3 aluminium cast alloys was investigated. With defined anodization parameter...
Effect of inoculation on high temperature plastic properties of the centrifugally cast Cr-Ni-Nb steel
High-temperature mechanical properties Austenitic Cr-Ni-Nb cast steel Centrifugal casting
2011/3/17
From the centrifugally cast sleeve segments, in direction parallel to the axis, the specimens for mechanical tests were cut out in a way such as to get in one batch of the specimens a structure compos...
Modelling of flow phenomena in the process of filling the model die mould - an application of the NovaFlow program
Die casting Turbulent flow Laminar flow Model testing Computer simulation
2011/3/17
Calculations performed by means of the calculation module NOVACAST (NovaFlow&Solid) for the selected models of cavities cast by the pressure method - are presented in the paper. The rates of filling o...
Comparison of selected tools for generation of knowledge for foundry production
Data mining Knowledge rules Decision trees Rough sets theory
2011/3/17
Two types of data mining tools, suitable for semi-automatic generation of knowledge in a form of logic rules, are presented in the paper: decision (classification) trees and rough sets theory algorith...
3-D inverse solution for continuous casting taking an air cap into consideration
Application of information technology to the foundry industry Boundary inverse problem
2011/3/17
The paper discusses a 3-D numerical solution of the inverse boundary problem for a continuous casting process of an aluminium alloy. Since the verified information on the heat flux distribution is cru...
Determination of the continuous casting cross-section with prescribed average temperature
Solidification Stefan problem Heat equation Continuous casting
2011/3/17
This paper presents the method of determination of the continuous casting cross-section, in which average temperature was equal to a prescribed value. The method proposed here does not require evaluat...