Articulated Screwdriving Unit for High-Pressure Alignment
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Solution Overview
Problem
Automatic screwdriving systems face issues with high contact pressures leading to robot axis deflection, misalignment of the screwdriving unit, and subsequent tilting of screws during screwing operations, resulting in gaps and distorted torque values.
Innovation Solution
An articulated bearing arrangement is introduced, allowing the screwdriving unit to pivot and maintain a right-angle position relative to the component, with additional joints in the tool holder and feed head enabling deflection compensation, ensuring the screw is driven straight and reducing transverse forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If high contact pressures are applied during screwdriving operation, then the screw connection achieves sufficient tightness, but the robot axis deflects and the screwdriving unit tilts
Solution Approach 1:
The patent introduces an articulated bearing arrangement that enables dynamic adaptation of the screwdriving unit's position. The articulated bearing allows the screwdriving unit to pivot and compensate for robot axis deflection in real-time, maintaining stability despite varying contact pressures during the screwdriving operation.
2Manufacturing precision
If the screwdriving unit tilts due to robot axis deflection, then the feed head misaligns with the component plane, but high transverse forces and bending stresses occur
Solution Approach 1:
The articulated bearing arrangement provides dynamic compensation for misalignment by allowing the screwdriving unit to pivot and maintain the feed head's perpendicular orientation to the component plane, preventing excessive transverse forces and bending stresses.
3Manufacturing precision
If the screw is driven at an angle due to feed head misalignment, then the screw tilts and gaps form, but the screw connection quality deteriorates
Solution Approach 1:
The articulated bearing arrangement dynamically adjusts the screwdriving unit's position to maintain the screw's perpendicular orientation to the component plane throughout the screwdriving operation, preventing tilting and gap formation that would compromise connection quality.
4Manufacturing precision
If additional articulated joints are added to compensate for deflection, then the screwdriving unit can maintain proper alignment, but the device complexity increases
Solution Approach 1:
The articulated bearing arrangement introduces additional joints to enable dynamic compensation for robot axis deflection, allowing the screwdriving unit to maintain proper alignment despite the increased structural complexity.
Data Source
AI summary
The screwdriving system for connection of components that require high contact pressures for their screw connection, having a screwdriving unit which is connected to an articulated robot, wherein the screwdriving unit contains a motor for the rotary drive, an actuator for the linear drive, a gear mechanism, a torque shaft, a tool holder for a screwdriving tool and a feed head which is supplied with screws, which are held in the feed head during the screwing-in operation, the tool holder, the screwdriving tool and the feed head being arranged on a common screw axis, includes an articulated bearing arrangement, the pivoting of which is able to compensate for a deflection of a robot axis of the articulated robot caused by contact pressures and for a tilted position of the screwdriving unit resulting therefrom.