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Machines: Problem Solving I01:22

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A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
The toggle clamp system is a machine structure consisting of movable, pin-connected multi-force members that form a stabilized system to transmit forces. The...
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Expansion Injection Molding Process Using Clamping Force for Melt Compression.

Joon Hyoung Park1, Sun Kyoung Kim1

  • 1Department of Mechanical System Design Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea.

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|February 10, 2024
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Expansion injection molding using platen compression shows promise for high-speed filling. Integrating valve action with machines is crucial for successful large-scale production of polymer parts.

Keywords:
MoldFlowcompressionexpansioninjection molding

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Area of Science:

  • Polymer processing
  • Manufacturing engineering

Background:

  • Melt expansion and compression are established for high-speed filling at the machine level.
  • Recent efforts explore mold-level technology for enhanced control.

Purpose of the Study:

  • To investigate an expansion injection molding process utilizing platen compression.
  • To design and build a novel mold system with temperature and valve control.

Main Methods:

  • Compression of polymer melt via cylinder action and platen movement.
  • Expansion of the polymer melt into a mold cavity.
  • Design and construction of a specialized mold system with integrated controls.

Main Results:

  • Good mold filling achieved at high injection pressures.
  • Simulations confirmed pressure and filling trends.
  • Identified limitations related to the state model characteristics.

Conclusions:

  • Platen compression shows potential for expansion injection molding.
  • Seamless integration of valve action with injection molding machines is essential for scalability.