Thin-Walled Metal Preforms for Accurate Hot Gas Bulging
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Solution Overview
Problem
Existing methods for manufacturing large-sized thin-walled metal components using hot gas bulging and 3D printing face challenges in achieving accurate shape, dimension, and structural properties due to deformation, local thinning, and poor surface finish, which are critical for aerospace and automotive applications.
Innovation Solution
A method combining 3D printing and hot gas bulging, where a preform is designed and printed, then heated and bulged under high pressure to achieve precise shaping, reducing deformation and enhancing material density and homogeneity, while addressing surface quality issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional rigid die stamping is used to pre-form thin-walled metal blocks, then the basic shape can be obtained, but the low integral rigidity causes distortion, local overcutting and buckling of ribs
Solution Approach 1:
The patent applies preliminary action by first creating a preform with approximate geometry through 3D printing, then using hot gas bulging to achieve final precise shaping. This two-stage approach allows the initial rough shaping to be done additively, followed by precision forming that corrects dimensional inaccuracies and surface quality issues without causing distortion or buckling
2Volume of moving object
If thin-walled metal blocks are tailor-welded to form complex integral components, then large-sized components can be manufactured, but the welding process creates deformation compatibility challenges between base metal and welds
Solution Approach 1:
The patent merges the preform creation and final shaping processes by using 3D printing to create a preform that is then directly formed into the final component through hot gas bulging. This integration eliminates the need for separate welding operations to assemble multiple blocks, thereby avoiding deformation compatibility issues between welds and base metal while still achieving large-sized component manufacturing
3Ease of manufacture
If thin-walled metal tubes/sheets are directly used for hot gas bulging, then the process can be simplified, but severe local deformation causes local thinned area that does not meet design requirements
Solution Approach 1:
The patent applies preliminary action by first creating a preform with optimized geometry and controlled wall thickness distribution through 3D printing. This preform serves as a prepared substrate that has already accounted for potential thinning areas, allowing the subsequent hot gas bulging to proceed with simplified process steps while maintaining precise wall thickness control and avoiding severe local deformation
4Adaptability or versatility
If 3D printing is used to create complex thin-walled preforms, then manufacturing flexibility is improved, but the printed preform has poor surface finish and dimensional accuracy
Solution Approach 1:
The patent uses hot gas bulging as an intermediary process that takes the 3D printed preform with poor surface finish and dimensional accuracy, and transforms it into a final component with high surface quality and precise dimensions. The hot gas bulging acts as a mediating step that corrects the deficiencies of additive manufacturing while preserving the manufacturing flexibility and design freedom provided by 3D printing
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly improves the forming quality and accuracy of large-sized thin-walled metal components by minimizing deformation and enhancing structural properties, achieving high-dimensional accuracy and surface finish suitable for complex aerospace and automotive components.
Implementation Method 1
use a high-pressure gas to bulge the preform to the final shape and dimensions
Implementation Method 2
the significantly improved plasticity of the metal material in the hot state
Implementation Method 3
heat the thin-walled preform and the die to a set temperature
Implementation Method 4
the significantly improved plasticity of the metal material in the hot state
Data Source
AI summary
The present invention discloses a method for manufacturing a thin-walled metal component by three-dimensional (3D) printing and hot gas bulging. The present invention uses 3D printing to obtain a complex thin-walled preform, which reduces a deformation during subsequent hot gas bulging. The present invention avoids local bulging thinning and cracking, undercuts at the parting during die closing, and wrinkles due to the uneven distribution of cross-sectional materials, etc. The present invention obtains a high accuracy in the form and dimension through hot gas bulging. After a desired shape is obtained by hot gas bulging, a die is closed to keep the component under high temperature and high pressure for a period of time, so that a grain and a phase of the material are transformed to form a desired microstructure.