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Test of Friction Parameters in Bulk Metal Forming Based on forward extrusion Processes

Journal of Shanghai Jiaotong university(Science) 2020年第3期25卷 333-339页

作者： CHEN Xia WEN Tong LIU Kefan HONG Yifei College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

Existing methods for examining the friction parameters in metal forming all have advantages and *** on the theory of plasticity,the current study established quantitative correlations among friction coefficient/factor,yield stress of the workpiece material,load and die geometry in the forward extrusion with a conical die,and then designed a procedure for testing the friction parameters in forming processes using the correlations.A series of extrusion experiments along with the numerical simulations,using AA 7050 specimens under various lubricating conditions,were carried *** results proved that the method can obtain the friction coefficient/factor with an acceptable ***,since the effects of material properties,forming velocity,temperature and surficial condition,etc.,on the deformation can be directly considered in the operation,this method is applicable to a wide range of material types and forming *** avoid the occurrence of "barreling phenomenon" under large load which may lead to failure of the operation,it is recommended that half angle of the conical die ranges from 5 to 10 degrees.

关键词： metal forming tribo-testing forward extrusion friction coefficient friction factor

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Deformation and densification behavior of discrete media filled thin-walled tubes during forward extrusion

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Transactions of Nonferrous Metals Society of China 2016年第8期26卷 2162-2169页

作者： Tong WEN Qing LIU Qian HUANG Wen-xue OU Jian-qing FENG College of Materials Science and Engineering Chongqing University Chongqing 400044 China Northwest Institute for Nonferrous Metal Research Xi’an 710016 China

Discrete media filled thin-walled hollow profiles are frequently used as integer structures for special purpose, e.g., in certain materials processing or architectural components. To understand the deformation of such composite structures which is a complicate mechanics process, involving coupled elastic-plastic deformation of dense metal, compaction of particle and interaction between the filler and the wall, the forward extrusion of Al 6061 tubes filled with various particles was studied. The analysis regarding internal volume variation of round tubes during forward extrusion indicates that with the diameter reduction the volume of tubes decreases commonly. The cavity shrinkage brings about triaxial pressure on the filler, resulted in compaction and densification of it. Loose powders filling leads to higher extrusion load. Due to dissimilar migration behaviors of the particles, the load?stroke curves of the tubes filled with fine powders and coarse balls are quite different. Small Lankford value of the tube wall material leads to higher hydrostatic pressure of the filler and then more powders are compacted.

关键词： tube forward extrusion powder deformation behavior densification

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Influence of homogenizing on mechanical properties of as-cast AZ31 magnesium alloy

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Transactions of Nonferrous Metals Society of China 2010年第B07期20卷 439-443页

作者：张宝红张治民 School of Materials Science and Engineering North University of China Engineering Technology Research Center for Integrated Precision Forming of Shanxi Province North University of China

forward extrusion experiments of as-cast AZ31 magnesium alloy were conducted at different temperatures and different extrusion ratios using the as-cast billets with and without homogenizing *** mechanical properties of pre-and post-extrusion of the two kinds of billets were *** results show that the mechanical properties of post-extrusion of the two kinds of billets all are obviously improved compared with those of *** elongation of post-extrusion using the billet with homogenizing is higher than that without homogenizing,but the tensile strength is lower than that without *** the extrusion ratio increases,the elongation and tensile strength of post-extrusion of two kinds of billets all will increase *** the extrusion temperature of billet without homogenizing increases,the tensile strength of post-extrusion will decrease obviously and the elongation of post-extrusion will change to a small *** the billet with homogenizing,the tensile strength of post-extrusion will decrease in some sort when extrusion temperature increases.

关键词： as-cast AZ31 magnesium alloy forward extrusion tensile strength elongation homogenizing treatment microstructure

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