Sheet Metal Stacking With Sensor Alignment and Vacuum Gripping
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Solution Overview
Problem
Existing methods for aligning sheet metal parts during unstacking and stacking are inefficient, prone to causing deformities, and require manual intervention, leading to misalignments that can result in processing defects and suboptimal storage in automated systems.
Innovation Solution
A method and system utilizing a fixed frame with positioning sensors and a movable frame equipped with a vacuum gripper and XYZ positioning system to accurately align sheet metal parts, ensuring correct stacking without deformation, using sensors to detect and correct angular and positional misalignments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If side forces are applied by presses to align stacks of sheet metal parts, then alignment is improved, but the sheet metal parts may bend and deform due to high cohesive and adhesive forces between them
Solution Approach 1:
The patent replaces the mechanical pressing system with a vacuum-based holding system. Instead of using presses that apply side forces to align stacks, the invention uses vacuum cups to hold individual sheet metal parts during transport and positioning. This substitution eliminates the deforming side forces while maintaining alignment capability through vacuum adhesion.
Solution Approach 2:
The patent employs vacuum technology (a branch of pneumatics) to hold and position sheet metal parts. Vacuum cups create negative pressure to adhere to the surface of individual parts, enabling precise positioning without mechanical contact that could cause deformation. This pneumatic approach resolves the contradiction by providing alignment capability without the harmful side forces of mechanical presses.
2Manufacturing precision
If manual alignment by operators is used for non-automated machine tool stations, then alignment experience can be applied, but productivity is reduced and consistency is compromised
Solution Approach 1:
The patent implements an automated system that performs alignment tasks without human intervention. The vacuum holding system combined with programmable positioning enables the machine to automatically align and position sheet metal parts according to pre-programmed parameters, replacing manual operator alignment while maintaining or improving both precision and productivity.
Solution Approach 2:
The system allows for programmable control of positioning parameters, enabling flexible adjustment of alignment specifications. By changing parameters in the control system rather than relying on manual skill, the invention achieves consistent high-precision alignment across different operators and shifts, while dramatically improving throughput through automation.
3Measurement precision
If vacuum grippers are used to hold sheet metal parts, then handling precision is improved, but the risk of part deformation increases due to suction forces
Solution Approach 1:
The patent distributes multiple vacuum cups across the surface of the sheet metal part rather than using a single large vacuum source. This local distribution of vacuum holding points reduces the suction force concentration on any single area, preventing deformation while maintaining overall holding capability and positioning precision through coordinated control of multiple cups.
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
The system ensures precise alignment of sheet metal parts, preventing deformation and ensuring correct insertion into machine tools, optimizing storage and processing efficiency while reducing manual intervention and potential damage.
Implementation Method 1
a movable frame (22) is provided, said movable frame (22) comprising a vacuum gripper configured to grip the sheet metal parts
Data Source
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AI summary
Method and system for stacking sheet metal parts that comprises providing a fixed frame with three positioning sensors and a movable frame comprising a vacuum gripper. Upon reception of a stack of sheet metal parts the method comprises gripping one sheet metal part, moving the movable frame in the Y-axis direction until the first and second positioning sensors detect the sheet metal part, calculating an angle "α" that corresponds to the rotation in Z-axis of the part and an overrun of the movable frame, rotating the movable frame the angle "α"; moving the movable frame in X-axis direction until the third positioning sensor detects the sheet metal part; calculating distances 'd1' and 'd2' as a difference between a predefined position for stacking the sheet metal parts and the current position of the metal sheet part; moving the movable frame the calculated distances 'd1' and 'd2' and depositing the part.