Advanced Manufacturing Processes

Abstract This paper presents a general method for the design, analysis and optimization of mechanical press linkages. In order to use the method, the linkage type must be identified, and geometrically proportioned to approximately satisfy the mecnanical requirements. Next, system equations must be derived for that linkage, which describe input/output relationships for displacement and force. Upon completing these two steps (which typically must be done in any case), the method can then be employed to optimize that linkage for the particular application.

Wang AlbertChi-Yor

Cisko LawrenceW.

COMPUTER-AIDED DESIGN, ANALYSIS AND OPTIMIZATION OF MECHANICAL PRESS LINKAGES

机械压力机连杆的计算机辅助设计、分析与优化

Abstract Rao and Chaturvedi [18] had presented an analysis to consider the effect of thickness on the forming limit diagrams through a correction in the MK model taking into consideration the influence of the triaxial stress state in the neck. This model predicted results closely matching the experimental values for Aluminium which is not sensitive to strain rate. This paper presents a new model for predicting forming limits for strain rate sensitive materials relying on the above work and the approach of Marciniak. Kuczynski and Pokara [13]. The results obtained are found to be in close agreement with experimental values (Pig. 4). The model has also been used to analyse the influence of various material property parameters and thickness on forming limits and these are also found to be in good agreement with reported experimental results. The model has also been extended to predict forming limits under a two stage strain path and the results have been compared with the experimental results of Ishigaki [8] (Figs.11 to 14).

U S Rao

R C Chaturvedi

A NEW MODEL FOR PREDICTING FORMING LIMITS FOR STRAIN RATE SENSITIVE MATERIALS

预测应变率敏感材料成形极限的新模型

Abstract Axisymmetric forging of powdered-metal preforms was analyzed by the finite element method neglecting the effect of temperature on deformation. A remeshing program based on the area-weighted-average technique was developed and tested by simulating forging of the flange-hub shape. Then the analysis was performed for forging of a pulley blank. The detailed deformation characteristics for the different preform shapes under the two frictional conditions were obtained. A comparison between the prediction and the experiment regarding proper preform design to forge defect-free pulley blank demonstrates that the finite element analysis is useful for further developments in preform design in powdered-metal forging.

Yong Taek Im

Shiro Kobayashi

ANALYSIS OF AXISYMMETRIC FORGING OF POROUS MATERIALS BY THE FINITE ELEMENT METHOD

有限元法分析多孔材料的轴对称锻造

Abstract A computer model is developed to simulate the electro-magnetic and the heat-transfer behaviors of the taper heating process. The computer-aided tool can provide the necessary information for design and operation of induction furnaces for taper heating required for isothermal extrusion. A feasibility study of two induction furnace designs is presented. Computer results indicate that the three-zone type furnace can provide the desired taper temperature profiles for the aluminum and the titanium alloys considered. Applications of the computer tool to other types of induction heaters are also discussed.

Ampere A. Tseng Associate Professor

COMPUTER-AIDED DESIGN AND OPERATION OF INDUCTION FURNACE FOR TAPER HEATING

感应炉锥形加热的计算机辅助设计与操作

ABSTRACT A quantitative model considering signal attenuation and tool flank wear is proposed to describe the influence of machining process parameters on the level of acoustic emission (AE) generation. The AE sensitivities to width of cut, feed rate, and hardness of material in three-dimensional cutting are experimentally studied. The application of AE signal analysis to chip formation detection, providing information for process control in unattended machining, is described.

Ming-Shong Lan

David A. Dornfeld

ACOUSTIC EMISSION AND MACHINING - PROCESS ANALYSIS AND CONTROL

声发射与加工 - 过程分析与控制

ABSTRACT Experimental work on impingement casting process of Pb-Zn, Pb-Zn-Sn and Al-Pb systems was carried out. Rapid mixing of immiscible liquid metals was achieved in an arrow-shaped mixing chamber due to vigorous turbulence. The particle size distribution in the castings fitted lognormal curve well. Pb-Zn-Sn system showed the smallest geometric average particle diameter and geometric standard deviation due to low interfacial tension. Various mechanisms of agglomeration were examined and related to the particle sizes. Gravitational sedimentation was shown to be a major parameter governing the agglomeration and hence the final microstructure. The geometric connectivity effect of volume fraction was studied by graphical simulation. When the volume fraction of the dispersed phase was above 30 percent, major portion of the particles were interconnected.

C.N. Chu

T. Oktay

N. Saka

N.P. Suh

IMPINGEMENT CASTING PROCESS OF IMMISCIBLE ALLOYS

非互溶合金的冲击铸造工艺

W. König

J. Fromlowitz

HIGH-PERFORMANCE GRINDING - POSSIBLE METHODS FOR INCREASING THE METAL REMOVAL RATE

高性能磨削——提高金属去除率的可能方法

B. Stuckenholz

HIGH-PERFORMANCE GRINDING WITH CBN WHEELS - PRE-CONDITIONS FOR PROCESS ECONOMY AND SUCCESSFUL APPLICATION

高性能磨削与CBN砂轮 - 工艺经济性和成功应用的先决条件

ABSTRACT The advantages of EDM polishing are to be found chiefly in the multidirectional processing of complex volumes without the undercuts which easily arise with manual polishing in tool- and mould-making. A considerable number of individual factors affect the polishing process, with decisive effects on the product quality which can be achieved. Particular importance may be ascribed to such pulse parameters as discharge current, pulse duration, pulse interval, open-circuit voltage and polarity, which must be carefully matched if a shining polished surface is to be achieved The attainable surface quality also depends strongly on the size of the surface to be polished, with considerable improvements to be anticipated through the use of the planetary technique. Planetary motion produces more uniform flushing conditions and has a levelling effect due to the mutual relative motion of the electrode surfaces, so that a surface is created which is not only microscopically fine but macroscopically smooth Specific process parameter problems due to 3-dimensional electrode motion should not be overlooked, however On the basis of a process analysis and comparative tests using conventional sinking, strategies aimed at taking into account the special conditions arising from the kinematics of planetary erosion were developed. These include matching power to the actual contact surface and matching translational speed to the geometry of the electrodes being used. These measures enable removal behaviour to be decisively improved.

L. Jörres

U. Behmer

The Kinematics of Planetary Erosion as a Basis for Electro-Discharge Polishing and Process Optimisation Strategies

出版信息	出版商: Marcel Dekker Inc.，出版周期: ，期刊类型: journal，开源期刊: 否
基本数据	创刊年份: 1986，原创研究文献占比: ，自引率:， Gold OA占比:

Advanced Manufacturing Processes

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