第13届21省（市、自治区）4市铸造学术会议暨第七届安徽省铸造技术大会通知

由安徽、北京、福建、广东、甘肃、河北、河南、黑龙江、湖北、湖南、江苏、江西、内蒙古、青海、山西、陕西、上海、四川、天津、新疆、浙江及成都、柳州、武汉、西安等铸造学会主办,     

第13届21省(市、自治区)4市铸造学术会议暨第7届安徽省铸造技术大会通知(2012年7月安徽·黄山市·屯溪)

由安徽、北京、福建、广东、甘肃、河北、河南、黑龙江、湖北、湖南、江苏、江西、内蒙古、青海、山西、陕西、上海、四川、天津、新疆、浙江及成都、柳州、武汉、西安等铸造学会主办,安徽省铸造学会承办的第13     

第十五届24省(市、区)4市铸造学术会议在成都召开

<正>由安徽、北京、重庆、福建、广东、甘肃、河北、河南、黑龙江、湖北、湖南、江苏、江西、内蒙古、青海、山西、陕西、上海、四川、天津、新疆、浙江、云南、广西等省(市、区)及成都、柳州、武汉、西安市等省市铸造学会主办、四川省铸造学会承办的第十五届24省(市、区)4市铸造学术会议于2014年8月15-17日在成都市召开,来自全国铸造行业的150余名代表出席了会议。会议收到征文122篇,审查录入《论文集》109篇。会议由四川省铸造学会理事长范洪远教授致欢迎辞,中国铸造学会刘鸿超副秘书长,四川省机械工程学会钟开华理事长,四川省铸造协会杨梓华秘书长致贺词。中国工程院院     

供求

深圳市立强再生资源回收有限公司我公司主要回收铜、铁、铝合金等贵重废料;电子脚、锡渣、锡膏、废电线电缆、线路版等电子废弃物;硅胶、亚克力、ABS、PC、PP、PVC、PCB板、吸塑等废塑料。     

中国工程建设焊接协会第六次六次会员大会暨第十届年会圆满闭幕

2011年9月15～18日，中国工程建设焊接协会在古城西安召开了第六次会员大会暨第十届年会。来自冶金、电力、石油、石化、化工、有色金属、水利水电、建筑、铁路、机械安装、船舶、核工业、航天、解放军、民营钢构等行业、企业的代表及部分高等院校、科研机构、焊接设备和材料制造厂家代表共计280多人出席了会议。     

第十二届21省(市、自治区)4市铸造学术会议暨新疆铸造节能减排论坛通知

由安徽、北京、福建、广东、甘肃、河北、河南、黑龙江、湖北、湖南、江苏、江西、内蒙古、青海、山西、陕西、上海、四川、天津、新疆、浙江及成都、柳州、武汉、西安等铸造学会主办,新     

第15届24省(市、区)4市铸造学术会议在成都召开

<正>由安徽、北京、重庆、福建、广东、广西、甘肃、河北、河南、黑龙江、湖北、湖南、江苏、江西、內蒙古、青海、山西、陕西、上海、四川、天津、新疆、云南、浙江等省(市、区)及成都、柳州、武汉、西安市等市铸造学会主办、四川省铸造学会承办的第十五届24省(市、区)4市铸造学术会议于2014年8月15-17日在成都市召开,来自全国铸造行业的150余名代表出席了会议。     

国际焊接学会（IIW）第65届年会及国际焊接会议预告

国际焊接学会（IIW）会员国家 澳大利亚、意大利、罗马尼亚、奥地利、日本、俄罗斯、比利时、哈萨克斯坦、塞尔维亚、巴西、黎巴嫩、新加坡、保加利亚、利比亚、斯洛伐克、加拿大、立陶宛、斯洛义尼亚、克罗地亚、马来西亚、南非、捷克、墨西哥、西班牙、丹麦、摩洛哥、瑞典、埃及、荷兰、     

首届全国现代铸造装备与技术交流大会会议及征文预通知

由安徽、北京、福建、广东、甘肃、河北、河南、黑龙江、湖北、湖南、江苏、江西、内蒙古、青海、山西、陕西、上海、四川、天津、新疆、浙江及成都、柳州、武汉、西安等铸造学会主办、由山西省机械工程学会铸造专业委员会、山西省铸造行业协会承办的全国第11届21省（市、自治区）4市暨山西省第二十二次铸造会议将定于2010年7月下旬在山西省太原市召开。现将本次会议的征文通知说明如下：     

第15届24省(市、区)4市铸造学术会议暨四川省2014年铸造学术年会通知

<正>由安徽、北京、重庆、福建、广东、甘肃、河北、河南、黑龙江、湖北、湖南、江苏、江西、内蒙古、青海、山西、陕西、上海、四川、天津、新疆、浙江、云南、广西及成都、柳州、武汉、西安等省市铸造学会联合主办,四川省铸造学会承办的铸造学术会议于2014年8月15日在成都市新华饭店召开,同期将举办铸造设备、仪器、原辅材料推介展示会,热忱欢迎国内外专家、学者、广大铸造工作者前来进行学术和技术交流。1会议主题:依靠技术进步促进铸造行业节能减排,科学推进铸造行业准入与建立铸造企业评价体系。     

铁镍梯度材料抗低应力多冲碰撞塑性变形性能研究

目的研究梯度材料抗低应力多冲碰撞塑性变形能力。方法对纯铁材料、铁镍突变材料和铁镍梯度材料进行多次冲击碰撞试验,分析3种材料的累积变形量、不同层深处的应变和形变硬化程度、表面微观组织。结果总形变量、不同层深处的应变和形变硬化程度方面,纯铁材料略大于铁镍突变材料,远大于铁镍梯度材料。铁镍突变材料和纯铁材料表层为单相多晶组织,且界面密度较小;铁镍梯度材料表层为多相多晶组织,且界面的密度大,其形变被抑制。结论铁镍梯度材料的抗低应力多冲碰撞塑性变形的能力最强,铁镍突变材料次之,纯铁材料最差。     

An evaluation of the statistics of steel material model parameters

In robustness studies, variations of material properties are often represented by simple assumptions, such as scaling of stress-strain relations, often due to lack of knowledge or deeper understanding of the material physics and the material model applied. By performing material characterisation tests on several batches of a DP600 steel and fitting a phenomenological material model to each batch, this paper studies the dispersion of material model parameters, as well as correlations between both experimental and model parameters. It is concluded that some of the characterisation tests may be omitted in the future, due to correlations found between parameters. The results may also be applied in a robustness study by inversely using the retrieved statistics to generate reasonable new sets of material model parameters. The methodology presented may be adopted for any other type of material characterisation process.     

Modeling of material flow in friction stir welding process

This paper presents a 3D numerical model to study the material flow in the friction stir welding process. Results indicate that the material in front of the pin moves upwards due to the extrusion of the pin, and then the upward material rotates with the pin. Behind the rotating tool, the material starts to move downwards and to deposit in the wake. This process is the real cause to make friction stir welding process continuing successfully. The tangent movement of the material takes the main contribution to the flow of the material in friction stir welding process. There exists a swirl on the advancing side and with the increase of the translational velocity the inverse flow of the material on the advancing side becomes faster. The shoulder can increase the velocity of material flow in both radial direction and tangent direction near the top surface. The variations of process parameters do have an effect on the velocity field near the pin, especially in the region in which the material flow is faster.     

添加石墨量及粒度对铁基材料性能的影响

通过粉末烧结方法分别将100目、200目石墨与铸铁屑按照不同的质量比例（1％、2％、3％、4％）经混合、压块、烧结等程序得到铁基石墨复合材料，并测出不同成分试样的硬度、耐磨性。研究结果表明：随着石墨粒度的细化，铁基石墨复合材料的硬度提高，抗压强度降低，偶件的磨损增大；随石墨添加量增加，材料硬度和抗压强度降低、磨损量增大，材料磨擦系数降低，偶件的磨损量降低。     

钛合金曲面超声辅助磁性磨料光整加工材料去除规律及去除函数

目的研究工件曲率半径、驻留时间以及加工角度对钛合金曲面超声辅助磁性磨料光整加工材料去除深度和材料去除曲线偏置程度的影响,建立不同走刀方式下的材料去除函数。方法在不同工件曲率半径、驻留时间和加工角度下,对钛合金曲面工件进行单点抛光试验,利用方差分析法,研究各因素水平对材料去除深度及材料去除曲线偏置程度的影响规律,采用最小二乘法拟合材料去除点坑在xoz平面和yoz平面内的材料去除曲线,基于二次多项式逐步回归方法,构建不同加工工艺参数下,材料去除曲线函数系数与加工工艺参数间的函数表达式,建立不同走刀方式下的材料去除函数,并对其进行准确性检验。结果由材料去除深度方差分析可得:驻留时间的F值为8.06,加工角度的F值为2.296,材料去除深度随驻留时间和工件曲率半径的增加而增加,随加工角度的增大,先增加后减小。由材料去除曲线偏置程度方差分析可得:工件曲率半径的F值为2.176,加工角度的F值为7.647,材料去除曲线偏置程度随工件曲率半径的增大而减小,随驻留时间和加工角度的增加而增加。此外,拟合的材料去除函数相关系数值R^2在0.97~0.99范围内。结论驻留时间对材料去除深度的影响最显著,加工角度次之,工件曲率半径影响最小。加工角度对材料去除曲线的偏置程度影响最显著,工件曲率半径次之,驻留时间影响最小。材料去除函数拟合结果较为准确,能满足实际的加工要求。     

Three-Dimensional Visualization of Material Flow During Friction Stir Welding of Steel and Aluminum

Material flow is a key phenomenon to obtain sound joints by friction stir welding (FSW), and it is highly dependent of the welded material. It is well known that the optimal FSW condition depends on the welded material. However, the material flow during FSW has not been totally clarified in spite of many researches. Especially, the material flow of steel during FSW is still unclear. It seems difficult to understand the material flow by the traditional method such as the tracer method or observation of the microstructure in the stir zone. Therefore, in this study, the material flow of steel was three dimensionally visualized by x-ray radiography using two pairs of x-ray transmission real-time imaging systems, and was then compared with the material flow of aluminum. The result revealed the effect of the welded material on the material flow during FSW.     

Effects of process parameters on material side flow during hard turning

The phenomenon of material side flow represents an important aspect of machined surface quality during hard turning. In this paper, an experimental study was performed to investigate the main features of this phenomenon. The effects of process parameters including edge preparation, nose radius, feed and tool wear on material side flow were examined. Two possible mechanisms for material side flow were investigated. In the first one, the material is squeezed between the tool flank face and the machined surface when chip thickness is less than a minimum value. In the second mechanism, the plastified material in the cutting zone flows through the worn trailing edge to the side of the tool. Both of these mechanisms can exist simultaneously. The results obtained from surface examination showed a strong correlation between edge preparation and material side flow. An increase in the tool nose radius resulted in a remarkable increase of material side flow. Feed had an indirect effect on material side flow. In addition, tool wear significantly affected the existence of material side flow on the machined surface. An increase in tool wear promoted the occurrence of material side flow.     

基于数值模拟的超疏水材料减阻性能研究

目的为了研究超疏水材料的减阻性能,提出一种准确可靠的数值模拟研究方法。方法建立超疏水船舶的三维模型,对考虑自由液面时船舶的黏性绕流进行数值模拟。由于表面接触角是评定材料疏水性的一个重要参数,通过改变表面接触角研究相应阻力值的变化,并采用理论计算、数值模拟以及实验研究三者相结合的方法,验证该模型及方法在超疏水材料减阻性能研究方面的准确性。结果随着表面接触角的增大船舶行驶时所受的阻力减小。船体采用超疏水材料的阻力比采用亲水性材料的阻力减少了41%,比采用一般疏水性材料的阻力减少了24%。模拟中得出的船舶模型阻力大小与理论计算以及实验结果基本吻合,误差分别在4.6%和8%以内。结论通过船舶模型研究超疏水材料的减阻性能,提出了一种基于数值模拟的有效研究方法,为超疏水材料其他方面的性能研究提供了一定指导。     

In-Process Identification of Material-Properties by Acoustic Emission Signals

An ever-increasing demand for high-performance parts calls for locally adapted material properties. This can be achieved by joining several materials into one part featuring common functional surfaces which have to be machined afterwards. These compounds provoke different material removal mechanisms which influence tool wear, cutting forces and surface properties. To introduce adapted parameters, in-process identification of the machined material is needed. Acoustic emission signals are used in grinding of steel/ceramic compounds to identify the machined material in-process. Unconditioned signals are recorded and by comparing material specific frequency ranges, the ground material is identified independently of the chosen cutting conditions.