Ultrasonic Stud Fixing for Thin-Walled Thermoplastic Ducts
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Solution Overview
Problem
Existing methods for fixing insulation matting to thin-walled polymer ducts, such as air conditioning ducts, are inefficient as they lack a process comparable to stud welding for metal ducts, requiring more time and labor, and are not applicable to other materials or objects.
Innovation Solution
A system comprising a stud and an ultrasonic tool that uses mechanical vibration energy to liquefy or plastify thermoplastic materials, allowing for embedding or welding the stud to the object, enabling efficient and versatile fixation of studs to various materials and objects without preparatory steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional fixing methods (threaded bolts with expanding polymer sleeves) are used for polymer ducts, then the fixation can be achieved, but the process becomes considerably more time consuming requiring bore creation and bolt rotation
Solution Approach 1:
The invention extracts and eliminates the time-consuming preparatory steps (bore creation) and complex mounting operations (bolt rotation) from the fixation process. By using self-drilling studs with integrated cutting edges that directly embed into the polymer duct, the method removes these separate operations and achieves fixation in a single action, dramatically improving productivity.
Solution Approach 2:
Instead of creating a bore first and then inserting a fastener (traditional sequence), the invention inverts the process by having the stud create its own path and embed directly into the material in one continuous motion. The stud's distal end with cutting edges simultaneously drills and anchors, reversing the conventional two-step approach.
2Productivity
If stud welding is used for metal ducts, then high productivity (150-200 studs per hour) is achieved, but this method is not applicable to thin-walled polymer ducts
Solution Approach 1:
The invention creates a universal fixation method that works across different materials (metal and polymer ducts) and various stud configurations. The self-drilling stud design with adjustable parameters (length, diameter, cutting edge geometry) allows the same basic method to be applied to diverse applications, replacing material-specific techniques like stud welding for metals or threaded bolts for polymers.
Solution Approach 2:
The invention achieves versatility by allowing parameter changes in the stud design (distal end geometry, cutting edge configuration, overall dimensions) to adapt to different materials and applications. The method can be adjusted for thin-walled polymers, thick-walled polymers, metals, and various stud lengths, maintaining high productivity across all applications.
3Reliability
If threaded bolts with expanding polymer sleeves are used, then fixation is achieved, but the process requires bore creation and bolt rotation which increases complexity
Solution Approach 1:
The invention merges multiple operations (bore creation, fastener insertion, and anchoring) into a single integrated action. The self-drilling stud combines the drilling function and anchoring function in one component that performs both tasks simultaneously during a single embedding operation, eliminating the need for separate bore creation and bolt rotation steps.
Solution Approach 2:
The stud is segmented into functional zones: a distal end with cutting edges for bore creation, a shaft for penetration, and a head for fixation. This segmentation allows each part to perform its specific function efficiently, with the cutting edges creating the path and the head providing the anchoring mechanism in a coordinated manner.
4Length of moving object
If studs with small diameter are used to minimize size, then the stud can be pushed through matting, but the stud must still be stiff enough for penetration without opening
Solution Approach 1:
The stud employs composite construction with a metal shaft providing stiffness and strength for penetration, and a polymer head providing embedding capability and matting push-through properties. This composite approach allows the stud to have small overall diameter while maintaining sufficient stiffness through the metal shaft, and the polymer head facilitates penetration without requiring pre-made openings.
Solution Approach 2:
Different parts of the stud have different material properties optimized for their specific functions: the shaft region has high stiffness and strength for penetration, while the head region has polymer material properties for embedding and matting interaction. This local quality differentiation allows the stud to meet conflicting requirements of small diameter and sufficient stiffness.
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 achieves efficient, accurate, and time-saving stud fixation with minimal force and handling effort, applicable to thin-walled polymer ducts and other objects, matching the performance of stud welding for metal ducts while accommodating different stud geometries and materials.
Implementation Method 1
mechanical vibration energy (in particular ultrasonic vibration energy) which is applied to the stud and which is used for local liquefaction or at least plastification of a material which is based on a thermoplastic polymer
Implementation Method 2
local liquefaction or at least plastification of a material which is based on a thermoplastic polymer
Data Source
AI summary
A system and a method for stud fixation with the aid of mechanical vibration energy that is applied to the stud and that is used for local liquefaction or at least plastification of a material, which is based on a thermoplastic polymer and includes the stud (at least distal stud end) and/or by the object (at least in a fixation location), wherein simultaneously the distal stud end is pressed against the fixation location of the object. Depending on the material pairing of stud (distal stud end) and object (fixation location), this results, on re-solidification of the liquefied or plasticized material, in an embedding of the distal stud end in the object (e.g. positive fit connection), in a welded connection between the distal stud end and the object, or in a local penetration of stud material into the object (e.g. positive fit connection).