Press Die Clearance Layout for Higher Shape Accuracy
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Solution Overview
Problem
Conventional press apparatuses face challenges in reducing deflection of support members during press-forming, which affects the shape accuracy of the resulting press-formed product, and existing solutions are complex and costly.
Innovation Solution
A press apparatus with non-uniform clearance dimensions in the no-load condition between die parts and support members, where the minimum clearance in the inner region is smaller than in the outer region, effectively absorbing deflections and reducing deformation of the die parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rigidity distribution member is introduced to reduce deflection of die parts, then the shape accuracy of press-formed products is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The invention applies local quality by creating non-uniform clearance distribution across the die part, with smaller clearance in the inner region and larger clearance in the outer region. This localized variation in clearance compensates for deflection without requiring a complete rigidity distribution member, thereby reducing overall device complexity while maintaining shape accuracy.
Solution Approach 2:
The invention changes the clearance parameter from uniform to non-uniform distribution. By adjusting the clearance dimension in different regions (inner vs outer), the system compensates for deflection effects and improves shape accuracy without adding complex structural components.
2Manufacturing precision
If the support member structure is changed to reduce deflection, then the shape accuracy of press-formed products is improved, but the manufacturing cost and device complexity increase significantly
Solution Approach 1:
Instead of changing the support member structure, the invention changes the clearance parameter distribution. This approach achieves deflection compensation through parameter optimization rather than structural modification, significantly reducing manufacturing cost and complexity.
3Manufacturing precision
If a rigidity distribution member is introduced to reduce deflection, then the shape accuracy of press-formed products is improved, but the manufacturing cost increases
Solution Approach 1:
The invention implements local quality through non-uniform clearance distribution, creating different clearance characteristics in inner and outer regions. This localized approach achieves deflection compensation without requiring expensive rigidity distribution members, thereby reducing manufacturing cost.
Solution Approach 2:
The invention optimizes the clearance parameter to achieve deflection compensation. By changing from uniform to non-uniform clearance distribution, the system improves shape accuracy through parameter optimization rather than adding expensive components.
Data Source
AI summary
A press apparatus 1 includes: a first die part 2 having a first working surface 2a; a second die part 3 having a second working surface 3a; a first support member 4 that supports the first die part 2; and a second support member 5 that supports the second die part 3. At least one of the first and second die parts 2 and 3 provides a clearance S1, S2 present in at least a portion of an overlap region R1, the overlap region being overlapped by the first and second working surfaces 2a and 3a as viewed in the press direction, the dimension of the clearance in the press direction in a no-load condition being non-uniform along two orthogonal directions as viewed in the press direction. The minimum dimension of the clearance Si within an inner region R1u in the no-load condition is smaller than the minimum dimension of the clearance S1 within an outer region R1s in the no-load condition, the inner region defined by, and located inward of, the middle line between the centroid G and edge of the overlap region R1.