The Stamping Method Utilizing a Double-Trough Die in Microforming to Enhance Formability

Area of Science:

• Manufacturing Engineering
• Materials Science
• Mechanical Engineering

Background:

• Microgear manufacturing faces significant challenges in size reduction, increasing complexity and production costs.
• Current microstamping processes often require extensive post-processing, impacting efficiency and material utilization.

Purpose of the Study:

• To develop and evaluate a new microgear manufacturing technique using trough dies to reduce processing steps and enhance material utilization.
• To investigate the effects of different die designs (flat, internal-trough, external-trough, double-trough) on material flow and stress during microgear forming.

Main Methods:

• Finite element simulations were employed to analyze stress, velocity, and material flow during the forming process with various microgear dies.
• The study compared four die configurations: flat, internal-trough, external-trough, and double-trough dies.

Main Results:

• Trough designs effectively reduced the rate of internal stress increase through a buffering effect.
• A 'hydrostatic pressure wall' was observed, constraining material flow and improving material distribution control.
• The double-trough die demonstrated enhanced forming velocity stability, reduced forming load and energy consumption, and maximized material utilization.

Conclusions:

• The double-trough die technique yields defect-free microgears with high dimensional accuracy (error < 5 μm, tolerances IT5-IT6).
• This innovative approach offers a viable solution to challenges in microgear manufacturing and microstamping processes.
• The study highlights the critical role of hydrostatic pressure in controlling material flow and distribution in microforming.