Exploring Polyurethane Elastomers as Flexible Punch Media for Microforming Applications: A Case Study of...

Area of Science:

• Materials Science
• Manufacturing Engineering
• Mechanical Engineering

Background:

• Microforming processes face challenges like size and friction effects, leading to defects such as fractures and distortions.
• Conventional cold forming methods struggle with uniform pressure distribution and defect mitigation in microscale operations.

Purpose of the Study:

• To investigate the feasibility of using polyurethane (PU) elastomer as a flexible punch-filling medium in microforming.
• To address defects and improve stability in cold forming by utilizing the properties of a high-hardness PU plate.

Main Methods:

• Employing a high-hardness (95A) polyurethane plate with high elasticity and near-incompressibility.
• Utilizing experiments and simulations with aluminum alloy Al 1050-O to analyze the PU-assisted extrusion-cutting process.

Main Results:

• The PU plate compensates for axial compression via lateral expansion, ensuring uniform pressure distribution.
• The method effectively reduces central stress, mitigates central acceleration effects, and minimizes defects caused by velocity gradients.
• PU-assisted cold forming demonstrated improved material flow, redistributed forming pressure, and enhanced overall forming stability compared to conventional techniques.

Conclusions:

• Polyurethane elastomer is a feasible and effective flexible punch-filling medium for microforming.
• This approach offers significant potential for advancing high-precision microforming technologies.
• The PU-assisted method provides a viable solution for defect reduction and stability enhancement in cold forming applications.