Split Collet Fastener Feeding for Recessed Resistance Welding
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Solution Overview
Problem
Existing methods for fastening work pieces, such as spot welding and self-piercing rivets, require feeding systems for rivets that are not efficient in multiple axes and often face challenges with access to recesses.
Innovation Solution
A resistance welding fastener feeding apparatus with a split collet and actuator system that allows for axial movement of the collet relative to the upper electrode, enabling the feeding and installation of fasteners into recesses by opening and closing around the fastener, and retracting to expose the electrode for welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional feeding systems are used for self-piercing rivets, then fastening work pieces can be achieved, but the system is not efficient in multiple axes and faces challenges with access to recesses
Solution Approach 1:
The collet is made movable relative to the electrode, allowing it to dynamically adjust its position. The collet can move into engagement with the fastener, hold it in position, and then retract to allow electrode access to the workpiece. This dynamic movement enables both multi-axis capability and access to recesses that would be inaccessible to static feeding systems.
Solution Approach 2:
The collet serves as an intermediary component between the fastener delivery system and the electrode. It temporarily holds the fastener and transfers it to the electrode, enabling precise positioning and control. This intermediary mechanism allows the system to handle fasteners in multiple axes while maintaining the ability to access recessed areas.
2Manufacturing precision
If the collet holds the fastener in position, then alignment is maintained, but the electrode must be exposed for welding requiring retraction
Solution Approach 1:
The collet's ability to move relative to the electrode creates a dynamic system where alignment and exposure requirements are sequentially satisfied. The collet moves into position to establish precise alignment, then retracts to expose the electrode for welding. This dynamic behavior resolves the contradiction between maintaining alignment and enabling electrode access.
Solution Approach 2:
The collet performs periodic cycles of engagement and retraction. During each cycle, it first engages to hold and align the fastener, then retracts to allow welding, and finally re-engages for the next fastener. This periodic action pattern allows the system to alternately satisfy alignment requirements and electrode exposure requirements.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A collet assembly including an actuator and a collet connected to the actuator. The collet assembly is adapted to be installed on a welding electrode holder having an electrode. The collet is moveable by the actuator from an advanced position, in which the collet is adapted to grip a fastener such as a welding rivet, and a retracted position, in which at least a portion of the collet is retracted into the actuator to enable the electrode to engage the fastener for welding to a work piece, and the collet is adapted to release the fastener.