Spinning Formability of Al-Mg-Si Alloy

2021 ◽  
Vol 1016 ◽  
pp. 1318-1324
Author(s):  
Shota Seta ◽  
Junya Kobayashi ◽  
Goroh Itoh
Keyword(s):  
Material Flow ◽  
Processing Method ◽  
Reduction Ratio ◽  
Generation Mechanism ◽  
Experimental Results ◽  
Basic Knowledge ◽  
Internal Defect ◽  
Plastic Forming ◽  
Diameter Reduction ◽  
Rotating Plate

Spinning is a type of plastic forming in which a tool such as a roller is pressed against a rotating plate or tube to gradually deform the shape and obtain a product with the same shape as the forming die. This processing method has the advantage that it can be processed seamlessly but has the drawback of causing internal defects due to deformation. In this study, the purpose is to obtain basic knowledge about the internal defect generation mechanism in spinning, and to perform cold and hot spinning with high diameter reduction under various conditions on Al-Mg-Si alloy tube. From the experimental results, it was confirmed that the inner defects increased as the diameter reduction ratio increased. It was considered that the main cause of the occurrence of inner defects was that, at a high diameter reduction ratio, the amount of processing was large, so that the increase of material flow led to increase of wall pressure.

An Investigation of the Predicting Capabilities of a Variable Flow Stress Machining Theory

2001 ◽  
Author(s):  
P. Mathew
Keyword(s):  
Flow Stress ◽  
Material Flow ◽  
Three Dimensional ◽  
Experimental Results ◽  
Two Dimensional ◽  
Variable Flow ◽  
Comparative Results ◽  
Intermittent Cutting ◽  
Theoretical Results ◽  
Modelling Approach

Abstract The Oxley Machining Theory, which has been developed over the last 40 years, is presented in this paper. The capability of the model is described with its initial two-dimensional machining approach followed by the extension to the generalised model for three-dimensional machining. The theoretical results from the model are compared with the experimental results to determine the model capability. A brief description of the work associated with the effect of strain hardening at the interface is presented and comparative results are shown. A further extension of the model to intermittent cutting process of reaming is also presented and a comparison with the experimental results indicates the model developed is quite capable of predicting cutting forces for reaming. In explaining the results obtain, the assumptions made are explained and the inputs required. The limitations of the modelling approach are presented. It is pointed out that the Oxley model is a versatile model as long as proper description of the material flow stress properties is presented.

Research on Precision Forging Law of Complicated Blade by Using 3D FE Simulation and Physical Modeling

2004 ◽  
Vol 471-472 ◽  
pp. 839-843 ◽  
Author(s):  
Mei Zhan ◽  
He Yang ◽  
Yue Lian Liu
Keyword(s):  
Physical Modeling ◽  
Material Flow ◽  
Optimization Design ◽  
Flow Characteristic ◽  
Fe Simulation ◽  
Challenging Issue ◽  
Precision Forging ◽  
Plastic Forming

Research on precision forming laws of complicated blade has been a challenging issue on international frontiers of plastic forming areas. The precision forging laws of the blade with a damper platform have been obtained by using 3D FE simulation and physical modeling. The laws involve in the deforming characteristics of the tenon, damper platform, middle blade body, and tip blade body, such as the unevenness of deformation and material flow, the branch-flow of material, material flow characteristic of the blade body and rotation forming characteristic of the damper platform. The research may serve as a guide to the optimization design of relevant process and dies.

Experimental Study of Kick up Phenomenon in Thermosonic Wire-Bonding

2012 ◽  
Vol 160 ◽  
pp. 77-81
Author(s):  
Jing Jing Tian ◽  
Lei Han
Keyword(s):  
Image Processing ◽  
Experimental Study ◽  
High Speed ◽  
Gold Wire ◽  
Wire Bonding ◽  
Processing Method ◽  
Experimental Results ◽  
High Speed Camera ◽  
Depth Study ◽  
Thermosonic Wire Bonding

Kick-up phenomenon during looping is an important factor in thermosonic wire bonding. In this study, the loping process during wire bonding was recorded by using high-speed camera, and wire profiles evolution was obtained from images sequence by image processing method. With a polynomial fitting, the wire loop profiling was described by the curvature changing, and kick-up phenomenon on gold wire was found between the instant of 290th frame(0.0537s) to 380th frame (0.0703s), the change of curvature is divided into three phases, a looping phase, a mutation phase and a kick-up phase. While in the kick-up phase, the kick up phenomenon is the most obvious. These experimental results were useful for in-depth study of kick-up phenomenon by simulation.

A Forward-Backward Data Processing Method for the Experimental Results of Reciprocating Motion

2012 ◽  
Author(s):  
Hsiao-Yeh Chu ◽  
Jen Fin Lin ◽  
Yi-Ting Li ◽  
Hung-Tai Hsieh ◽  
Guan-Lin Chen ◽  
...  
Keyword(s):  
Electrical Contact ◽  
Sampling Rate ◽  
Wear Test ◽  
Processing Method ◽  
Experimental Results ◽  
Test Duration ◽  
Reciprocating Motion ◽  
Huge Number ◽  
Electrical Contact Resistance ◽  
Starting Point

This study develops the forward-backward processing method to deal with a huge number of data collected from a long test duration at a low sampling rate. Applications of this method, in addition to the proper choice of the ratio of the frequencies of the reciprocating motion and the sampling rate and the choice of the optimum subdivision number in a cycle, are able to obtain a smooth reborn profile with a high degree of accuracy from the huge number of sampling data. This reborn profile is obtained by averaging the data mapped into every subdivision of this cycle. In order to identify the qualified cycles in the reciprocating motions, which are able to map all the sampling data in these cycles into a cycle, the starting-point criterion is also developed. This present method has been proven to be really effective when applied to the experimental results of friction coefficient and electrical contact resistance collected in a dry wear test.

The Recognition of Smart Car Track and Starting Line

2011 ◽  
Vol 308-310 ◽  
pp. 833-836
Author(s):  
Wen Dai ◽  
Ming Ge Cao ◽  
Xu Ying Ren
Keyword(s):  
Image Processing ◽  
Control System ◽  
Recognition Rate ◽  
Processing Method ◽  
Experimental Results ◽  
Recognition Method ◽  
Image Processing Method ◽  
Main Track ◽  
The Given ◽  
Motor Controls

In this paper, an intelligent car control system based on MCU is proposed. A camera mounted on the car is used to capture path images, in which path is recognized by image processing method. Based on the extracted path information, the car motor controls are applied to keep car running in the given path. The recognition rate and precision of main track and starting line will directly affect the precision of control system. In this article, a recognition method is proposed, and experimental results show that our car can follow the main track and stopped on the starting line.

Press Forging of Magnesium Alloy AZ31 Sheets

2007 ◽  
Vol 539-543 ◽  
pp. 1753-1758 ◽  
Author(s):  
Shi Hong Zhang ◽  
Zhang Gang Li ◽  
Yong Chao Xu ◽  
Li Mei Ren ◽  
Zhong Tang Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Process Parameters ◽  
Material Flow ◽  
Friction Condition ◽  
Experimental Results ◽  
Alloy Az31 ◽  
Magnesium Alloy Az31 ◽  
Typical Component ◽  
Blank Size

Press forging of magnesium alloy AZ31 sheets was investigated in this paper. The typical component, a rectangular box with bosses at the bottom was formed. The experimental results show that the magnesium alloy sheets are suitable for press forging. The bosses and the rectangular box can be formed synchronously for 2 mm or 3 mm thick sheets when the punch temperature is 250 °C. By experimentation and numerical simulation, the effects of process parameters on material flow were analyzed, including the temperature, the die shape, the blank size, the lubrication manners and the friction condition.

A Novel Intelligent Turn-Milling Machine for Processing Huge Workpiece

2013 ◽  
Vol 325-326 ◽  
pp. 1387-1391
Author(s):  
Zhi Hong Chen ◽  
Hai Rong Fang ◽  
Yue Fa Fang
Keyword(s):  
Plastic Material ◽  
Processing Method ◽  
Experimental Results ◽  
Milling Machine ◽  
Position Sensor ◽  
Turning Operation ◽  
Nc System ◽  
Turn Milling ◽  
Equal Thickness

This paper presents a novel intelligent turn-milling machine, which processes the plastic material on the surface of huge cylindrical aluminum tank equal-thickness. The workpiece is too huge and cannot be processed by traditional lathe for turning operation. In order to make the plastics smooth and equal-thickness, the distance between the cutter and the surface of the tank is kept constant according to the feedback of position sensor placed before the cutter. Via the position sensor, the data of the workpiece shape can be obtained real-timely and the cutter feeding can be controlled by NC system to trace along the workpiece parts figure intelligently. Finally, experimental results verify the effectiveness of the processing method.

Analysis of Lateral Extrusion of 6061-0 Aluminum by Slip Line Theory Modified to Include Strain-Hardening

1972 ◽  
Vol 94 (4) ◽  
pp. 971-978
Author(s):  
P. J. Quenzi ◽  
R. W. Kauppila ◽  
K. J. Weinmann
Keyword(s):  
Analytical Solution ◽  
Strain Hardening ◽  
Slip Line ◽  
Material Flow ◽  
Extrusion Process ◽  
Experimental Results ◽  
Material Strength ◽  
Substantial Agreement ◽  
Lateral Extrusion ◽  
Line Theory

An analytical solution for the symmetrical lateral extrusion process based on slip line theory is presented. The analysis incorporates the stress equations modified for strain-hardening and the conventional First Theorem by Hencky. Material flow, material strength, and forces for extruding 6061-0 aluminum are thus analyzed. The calculated ram forces are found to be in substantial agreement with experimental results.

scholarly journals Optimal diameter reduction ratio of acinar airways in human lungs

2018 ◽  
Author(s):  
Keunhwan Park ◽  
Taeho Son ◽  
Young-Jae Cho ◽  
Noo Li Jeon ◽  
Wonjung Kim ◽  
...  
Keyword(s):  
Human Lung ◽  
Oxygen Transfer Rate ◽  
Minimum Cost ◽  
Reduction Ratio ◽  
Gas Transfer ◽  
Unit Surface Area ◽  
Murray's Law ◽  
Murray’S Law ◽  
Conducting Airways ◽  
Diameter Reduction

AbstractIn the airway network of a human lung, the airway diameter gradually decreases through multiple branching. The diameter reduction ratio of the conducting airways that transport gases without gas exchange is 0.79, but this reduction ratio changes to 0.94 in acinar airways beyond transitional bronchioles. While the reduction in the conducting airways was previously rationalized on the basis of Murray’s law, our understanding of the design principle behind the acinar airways has been far from clear. Here we elucidate that the change in gas transfer mode is responsible for the transition in the diameter reduction ratio. The oxygen transfer rate per unit surface area is maximized at the observed geometry of acinar airways, which suggests the minimum cost for the construction and maintenance of the acinar airways. The results revitalize and extend the framework of Murray’s law over an entire human lung.

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