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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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Numerical Simulation and Process Optimization of Internal Thread Cold Extrusion Process.

Hong-Ling Hou1,2, Guang-Peng Zhang1, Chen Xin2

  • 1School of Mechanical and Precision Instrumental Engineering, Xi'an University of Technology, Xi'an 710048, China.

Materials (Basel, Switzerland)
|September 10, 2020
PubMed
Summary
This summary is machine-generated.

Optimizing internal thread extrusion forming parameters significantly reduces extrusion torque and temperature. This enhances thread quality, demonstrating practical engineering benefits.

Keywords:
internal thread cold extrusionnumerical simulationphysical testprocess parameter optimization

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Area of Science:

  • Manufacturing Engineering
  • Materials Science

Background:

  • Improper process parameters in internal thread extrusion forming can lead to increased extrusion torque, excessive temperatures, and tool failure.
  • Optimizing these parameters is crucial for efficient and reliable thread production.

Purpose of the Study:

  • To identify optimal process parameters for internal thread extrusion forming.
  • To analyze the influence of bottom hole diameter, extrusion speed, and friction factor on extrusion torque and temperature.

Main Methods:

  • Utilized a combination of numerical simulation and process experiments.
  • Employed orthogonal experimental design to study parameter influence and significance.
  • Validated optimized parameters through simulations and tests.

Main Results:

  • Determined the significant influence of process parameters on extrusion torque and temperature.
  • Achieved a 37.15% reduction in maximum extrusion torque and a 29.72% reduction in maximum temperature.
  • Produced extruded threads with clear contours, uniform pitch, complete shapes, and good flatness.

Conclusions:

  • The optimized process parameters and methodology offer significant improvements in internal thread extrusion forming.
  • The study demonstrates good engineering practicability for the developed optimization approach.