Stud Holding Device with Segmented Securing Sleeve
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Solution Overview
Problem
Existing holding devices for studs with radially projecting flange sections often result in studs becoming obliquely positioned during feeding, leading to inefficient centering and potential ejection, causing noise and contamination issues in automated joining processes, particularly in the motor vehicle industry.
Innovation Solution
A holding device with a securing device featuring at least two movable radially relative securing-sleeve sections and radially elastic support elements, which securely positions the stud by forming a sleeve shape and providing a stable path for the flange section, preventing extreme oblique positions and ensuring reliable feeding and centering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the inside diameter of the insertion section is made slightly larger than the outside diameter of the flange section to enable easy stud transport, then the ease of operation is improved, but the stud may come into an oblique position and require centering, which may fail and lead to ejection, reducing reliability
Solution Approach 1:
The securing device performs preliminary centering and positioning of the stud flange section before the stud reaches the clamping section. By securing the flange section radially inwardly between the securing device and clamping section, the system prevents oblique positioning and ensures proper alignment in advance, eliminating the need for subsequent centering operations that could fail.
2Device complexity
If a single-piece securing device is used, then the device complexity is reduced, but the ability to adapt to different stud types and provide appropriate clamping force is limited, reducing versatility
Solution Approach 1:
The securing device is divided into multiple independent securing-sleeve sections (first, second, and third sections) that can move radially relative to one another. This segmentation allows each section to independently adapt to the flange section geometry while maintaining overall functionality. The sections work together to provide versatile securing capability for different stud types without excessive complexity.
Solution Approach 2:
The securing-sleeve sections are designed to be movable radially relative to one another, allowing the securing device to dynamically adjust its configuration. This dynamic capability enables the device to adapt to different flange section dimensions and geometries, providing versatility for various stud types while maintaining a relatively simple overall structure.
3Reliability
If the securing-sleeve sections are made as separate movable components, then the adaptability and securing capability are improved, but the device complexity increases
Solution Approach 1:
The multiple securing-sleeve sections are arranged concentrically and nested within one another, with each section movable radially relative to the others. This nesting arrangement allows the complex multi-section structure to occupy minimal space while maintaining the functionality of individual sections. The sections can move independently to provide reliable securing capability without requiring excessive structural complexity.
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 improved holding device enhances the reliability of stud feeding, reduces unnecessary ejections, minimizes noise and contamination, and allows for cost-effective production by securely maintaining the stud in a centered position, enabling efficient initiation of joining processes, including stud welding.
Implementation Method 1
radially elastic support elements, which securely positions the stud by forming a sleeve shape and providing a stable path for the flange section
Data Source
AI summary
A method of feeding a stud to a joining head including a stud shank clamp and operable to join the stud to a workpiece, and wherein the method of feeding the stud comprises the steps of providing a stud holding device including a securing sleeve and a plurality of collet arms; feeding the stud into the stud holding device to a first position wherein the flange is arranged above the free end of the plurality of arms and below the securing sleeve; and securing the stud in the first position by engaging the securing sleeve behind the flange.