Sensor-Guided Variable Die for Real-Time Springback Correction
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Solution Overview
Problem
Existing methods for correcting springback in material bending are inefficient and fail to accurately predict and correct forming errors due to variations in material properties and working environments, particularly in high-strength materials like coil steel sheets.
Innovation Solution
A variable die and pressing apparatus that includes a first lower die portion with a sensor unit and a driving unit to measure and adjust forming distances in real time, allowing for continuous correction of forming errors by adjusting the position of an inner member to compensate for springback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a separate die is manufactured according to physical properties of materials to compensate for springback, then springback correction effect is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The die structure is transformed from a static, fixed configuration to a dynamic, adjustable one. The movable side part can be positioned at different locations along the bending line according to material properties and springback characteristics, enabling the same die to adapt to different forming conditions without requiring multiple specialized dies.
Solution Approach 2:
The position of the side part along the bending line is changed as a variable parameter to compensate for springback. By adjusting the lateral position of the side part, the die can modify the stress distribution during bending to counteract springback effects, eliminating the need to manufacture separate dies for different material properties.
2Manufacturing precision
If a die is manufactured based on sample physical properties, then springback correction is attempted, but adaptability to different working environments deteriorates
Solution Approach 1:
The die incorporates a movable side part that can be repositioned along the bending line to adapt to different working conditions. This dynamic adjustment capability allows the die to compensate for variations in material properties, wound position, and wound tension without requiring remanufacturing, thereby maintaining both precision and adaptability.
Solution Approach 2:
The die structure is designed to perform multiple functions through the movable side part mechanism. A single die can handle different material types, different springback magnitudes, and different working environments by simply repositioning the side part, making it a universal solution rather than requiring specialized dies for each condition.
3Device complexity
If fixed die structure is used for material bending, then device complexity is reduced, but manufacturing precision deteriorates due to inability to correct springback
Solution Approach 1:
The die includes a movable side part that can be positioned at different locations along the bending line. This dynamic element adds minimal structural complexity while enabling real-time adjustment to compensate for springback, thereby significantly improving forming precision without substantially increasing device complexity.
Solution Approach 2:
The die is divided into a main body and a separate movable side part. This segmentation allows the side part to be independently positioned and adjusted along the bending line, providing a simple yet effective mechanism for springback correction that does not require complex overall die restructuring.
Data Source
AI summary
A variable die according to an embodiment of the present invention may comprise: a first lower die part; and a first upper die part disposed above the first lower die part, wherein: the first lower die part comprises a first lower die center part and a first lower die side part; the first lower die center part includes a first sensor unit which measures a distance; a first lower die side part includes an inner member having a slope, and a drive unit which moves the inner member toward the first lower die center part; the first sensor unit measures a forming distance which is the distance from the first sensor unit to a material; and the driver unit is driven on the basis of the forming distance to adjust a correction distance which is the moving distance of the inner member.