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A Non-Thinning Forming Method with Improvement of Material Properties
Yankuo Guo1, Yongjun Shi2, Feng Guo1
1School of Mechanical and Automotive Engineering, Qingdao University of Technology, No. 777, Jialingjiang Road, Huangdao District, Qingdao 266520, China.
Materials (Basel, Switzerland)
|January 8, 2023
Summary
A novel baffle pressure method (BPM) for thermal stress forming significantly enhances bending angles without thickness thinning. This improved process also refines grain size and increases microhardness, offering a superior alternative for high-performance applications.
Area of Science:
- Materials Science
- Mechanical Engineering
- Manufacturing Processes
Background:
- Thickness thinning is a critical defect in traditional metal forming processes like stamping and bending, especially for high-performance applications such as pressure vessels.
- Current thermal stress forming methods offer thinning-free forming but are limited by small achievable bending angles.
- The need for improved forming techniques that overcome these limitations is crucial for advancing manufacturing capabilities.
Purpose of the Study:
- To introduce and investigate a novel thermal stress forming technique, the baffle pressure method (BPM), designed to overcome the limitations of existing methods.
- To analyze the coupled thermodynamic model of BPM and understand its bending angle and deformation mechanisms.
- To evaluate the effects of BPM on material properties, including grain size and microhardness.
Main Methods:
- Establishment of a coupled thermodynamic model for the baffle pressure method (BPM).
- Investigation of bending angles and deformation mechanisms using the established model.
- Experimental measurement and analysis of grain size and microhardness in formed materials.
Main Results:
- The BPM significantly increases the bending angle by 57.71 times compared to traditional methods.
- The bending angle in BPM is influenced by both thermal buckling and the baffle, with the baffle playing a dominant role.
- BPM refines grain size, increases material microhardness by 1.31 times, and thickens the deformation zone by approximately 2.75%.
Conclusions:
- The baffle pressure method (BPM) effectively enhances the bending angle in thermal stress forming without causing thickness thinning.
- BPM offers improvements in material properties, including refined grain structure and increased microhardness.
- The study provides an analytical equation for beam bending with a laser heat source, contributing to the theoretical development of thermoplastic bending.
