Hemming Path Planning With Springback Compensation
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Solution Overview
Problem
In curved sheet metal automatic shaping, the varying springback amounts at different locations after each process stage complicate the maintenance of accurate relative positions and angles between the processing tool and sheet metal, hindering processing speed and product quality.
Innovation Solution
A hemming path planning method that combines initial contour data with expected springback amounts to pre-plan continuous hemming paths, allowing for accurate positioning and angle adjustments without re-measurement during processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multi-stage hemming processes are performed to improve processing yields, then the shaping quality is improved, but the processing speed deteriorates due to repeated re-measurement and path modification
Solution Approach 1:
The patent applies preliminary action by pre-calculating and compensating for springback amounts during the path planning stage. The system divides the hemming path into multiple segments, each with pre-determined bending angles that account for expected springback. This allows the processing tool to follow a pre-planned continuous path without requiring re-measurement after each stage, thus maintaining high shaping quality while improving processing speed.
2Manufacturing precision
If re-measurement is performed after each process stage to maintain accurate relative position and angle, then the manufacturing precision is improved, but the loss of time increases due to repeated measurement and path modification
Solution Approach 1:
The patent uses copying by creating a pre-calculated hemming path model that incorporates expected springback compensation. Instead of repeatedly measuring the actual springback occurrence, the system uses a predetermined path model that copies the anticipated deformation behavior. This allows the processing tool to follow the pre-planned path without continuous re-measurement, significantly reducing time loss while maintaining positioning accuracy.
3Productivity
If the processing tool follows a pre-set standard path without springback compensation, then the processing speed is improved, but the manufacturing precision deteriorates due to inaccurate relative position and angle
Solution Approach 1:
The patent applies preliminary anti-action by incorporating springback compensation into the path planning stage. The system calculates expected springback amounts and adjusts the bending angles of path segments in advance to counteract the anticipated springback effect. This allows the processing tool to follow a continuous pre-set path at high speed while maintaining accurate relative position and angle, as the path itself has been designed to compensate for springback.
Data Source
AI summary
A hemming path planning method and a hemming system are provided. The hemming path planning method includes the following steps. An initial contour data of a target is scanned to obtain. A first segment of the hemming path is planned according to the initial contour data. The first segment corresponds to a first bending angle. A second segment of the hemming path is planned according to the initial contour data and an expected springback amount related to the first bending angle. The second segment corresponds to a second bending angle. The first segment and the second segment are combined to obtain a continuous hemming path.