Press Forming Die Stiffness Modeling for Lower Forming Loads
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Solution Overview
Problem
Existing methods for designing press forming dies are time-consuming and require frequent re-modeling of die structures to reduce press forming loads, which hinders efficient manufacturing of high-tensile steel parts.
Innovation Solution
A method involving the creation of a die model with a virtual thickness using nonrigid two-dimensional elements, allowing for adjustable stiffness distributions through boundary conditions, thereby reducing press forming loads without extensive re-modeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a solid model (three-dimensional element) of an elastic body is used for FEM analysis to design press forming die structure, then the press forming load can be accurately analyzed, but the calculation time increases and modeling must be repeated every time the structure changes
Solution Approach 1:
The patent creates a simplified die model that copies only the essential surface geometry and stiffness distribution characteristics of the actual die, rather than replicating the full three-dimensional solid structure. This copied model enables rapid iteration of stiffness distributions without repeated solid modeling, maintaining sufficient accuracy for load estimation while dramatically reducing preparation time.
Solution Approach 2:
The patent changes the fundamental parameters of the die model from solid three-dimensional elements to shell elements with virtual thickness, allowing stiffness to be defined through boundary conditions rather than solid material properties. This parameter change enables quick modification of stiffness distributions without remeshing the entire solid structure.
2Force
If the stiffness distribution of the press forming die is changed to reduce press forming load, then the press forming load decreases, but the design process becomes time-consuming due to repeated modeling and FEM analysis
Solution Approach 1:
The patent makes the die model dynamically adjustable by defining stiffness through boundary conditions on shell elements rather than fixed solid material properties. This allows the stiffness distribution to be easily modified and re-analyzed without remodeling, enabling rapid optimization of press forming load while maintaining design flexibility.
Solution Approach 2:
The patent changes the fundamental parameters of the die model from solid three-dimensional elements to shell elements with virtual thickness, allowing stiffness to be defined through boundary conditions rather than solid material properties. This parameter change enables quick modification of stiffness distributions without remeshing the entire solid structure.
3Force
If a press forming die structure is designed to reduce press forming load, then the load on the press machine decreases, but conventional methods require extensive re-modeling and analysis time
Solution Approach 1:
The patent creates a simplified die model that copies only the essential surface geometry and stiffness distribution characteristics of the actual die, rather than replicating the full three-dimensional solid structure. This copied model enables rapid iteration of stiffness distributions without repeated solid modeling, maintaining sufficient accuracy for load estimation while dramatically reducing preparation time.
Solution Approach 2:
The patent changes the fundamental parameters of the die model from solid three-dimensional elements to shell elements with virtual thickness, allowing stiffness to be defined through boundary conditions rather than solid material properties. This parameter change enables quick modification of stiffness distributions without remeshing the entire solid structure.
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 enables the design of press forming dies that reduce press forming loads efficiently, allowing for faster design cycles and improved manufacturing efficiency, while maintaining accurate press load estimation.
Implementation Method 1
a die model making step of making a die model in which a surface of the press forming die is provided with a virtual thickness by a nonrigid two-dimensional element; a die model stiffness distribution setting step of setting stiffness distributions of the die model by making a boundary condition of the two-dimensional element vary depending on a portion of the die model
Data Source
AI summary
A designing method of a press forming die reduces a press forming load and includes: making a die model in which a surface of the press forming die is provided with a virtual thickness by a nonrigid two-dimensional element; setting stiffness distributions of the die model by making a boundary condition of the two-dimensional element vary depending on a portion of the die model; acquiring a press forming load by performing a press forming analysis by using the die model in which the stiffness distributions are set; determining whether the press forming load is within a predetermined range of the press forming load; determining the set stiffness distributions of the die model as design stiffness distributions of the press forming die in a case where it is determined that the press forming load is within the predetermined range of the press forming load.