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Structural steel products are created within a structural mill. The process begins with a beam blank that is reheated and then fed through a series of rollers. These rollers progressively shape the metal into its final form. Adjusting the spacings between the rollers allows for the production of different sections with the same nominal dimensions.
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The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
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The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
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A Comparative Study on Flat and U-Shaped Copper Strips Produced by Continuous Extrusion.

Mo Zhou1,2, Xinbing Yun1, Hongwang Fu1

  • 1Engineering Research Center of Continuous Extrusion, Ministry of Education, Dalian Jiaotong University, Dalian 116028, China.

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Summary

Continuous extrusion of U-shaped copper strips is superior to flat strips, yielding smaller grain sizes and uniform microstructure. This advancement overcomes previous size limitations in continuous extrusion processes.

Keywords:
continuous extrusioncopper stripsexpansion formingmicrostructureprocessing parameters

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Area of Science:

  • Materials Science and Engineering
  • Manufacturing Processes

Background:

  • Continuous extrusion is a key manufacturing process for metal strips.
  • Existing methods face limitations, particularly concerning product shape and size.
  • Investigating novel geometries like U-shaped strips is crucial for process improvement.

Purpose of the Study:

  • To compare the continuous extrusion of flat and U-shaped pure copper strips.
  • To analyze the influence of strip geometry on process parameters and microstructure.
  • To determine the feasibility and advantages of extruding U-shaped copper strips.

Main Methods:

  • Finite element simulation to model the extrusion process.
  • Experimental validation including temperature and torque force measurements.
  • Microstructural analysis using microscopy to compare grain size and uniformity.

Main Results:

  • U-shaped copper strips exhibited lower temperature, velocity, and loading force at the die exit compared to flat strips.
  • Experimental results confirmed the simulation findings regarding temperature and torque.
  • The U-shaped strips showed a smaller average grain size (65.6 µm vs. 96.7 µm) and more uniform microstructure with a higher recrystallization ratio.

Conclusions:

  • Continuous extrusion of U-shaped copper strips is advantageous over flat strips due to improved process parameters and material properties.
  • Even and severe plastic deformation in U-shaped extrusion leads to enhanced microstructural uniformity and finer grains.
  • This study successfully addresses and overcomes the size limitations previously associated with continuous extrusion.