Sonotrode Cavity Geometry for Electronic Cigarette Ultrasonic Welding
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Solution Overview
Problem
Existing sonotrodes for ultrasonic welding of electronic cigarette plastic components fail to achieve optimal welding due to irregular conformations, resulting in inaccuracies and excess material in unwanted areas.
Innovation Solution
A sonotrode with a cavity shape that complements the irregular outlines of electronic cigarette components, including a first arc and second arc of a reference circumference with external protrusions, allowing precise welding of airflow groups and base elements with enlarged portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional sonotrode with a simple cylindrical cavity is used for ultrasonic welding, then the device complexity is low, but the manufacturing precision deteriorates due to inability to control welding of irregularly shaped components
Solution Approach 1:
The sonotrode cavity is designed with non-uniform wall thickness and irregular geometry that matches the specific shape of the plastic components to be welded. The cavity has varying depths and wall thicknesses in different regions, allowing localized control of ultrasonic energy distribution to achieve precise welding of irregularly shaped components with enlarged portions.
Solution Approach 2:
The sonotrode cavity departs from symmetric cylindrical design to an asymmetric shape with irregular contours that complement the asymmetric geometry of the plastic components. The cavity walls are positioned at different distances from the center axis, creating an asymmetric ultrasonic field that matches the component geometry for optimal welding control.
2Manufacturing precision
If a conventional sonotrode is used for welding irregularly shaped plastic components, then the device complexity remains low, but the welding quality deteriorates with excess material and non-continuous welding
Solution Approach 1:
The sonotrode cavity is pre-designed with geometry that anticipates and accommodates the irregular shapes and enlarged portions of the plastic components before welding begins. The cavity shape is configured in advance to guide the ultrasonic vibrations and molten plastic flow, ensuring continuous welding paths and preventing material accumulation in unwanted areas.
Solution Approach 2:
The sonotrode cavity parameters such as wall thickness, curvature radius, and cavity depth are specifically optimized to control the ultrasonic vibration distribution. By adjusting these geometric parameters, the welding process achieves continuous welds without excess material, adapting the ultrasonic energy distribution to match the component geometry.
3Adaptability or versatility
If a simple cylindrical sonotrode cavity is used, then the ease of manufacture is high, but the adaptability to irregular component shapes deteriorates
Solution Approach 1:
The cavity is manufactured with locally varied properties including non-uniform wall thickness and irregular cross-sections that match specific component geometries. This localized customization allows the sonotrode to adapt to different irregular shapes while maintaining manufacturability through controlled variation rather than complete redesign.
Solution Approach 2:
The sonotrode cavity employs asymmetric geometry with irregular contours that provide adaptability to asymmetric component shapes. The asymmetric design is achieved through precision machining or molding techniques that can handle complex geometries while maintaining manufacturing feasibility.
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
Ensures precise and continuous welding of plastic components, avoiding inaccuracies and excess material, even in components with irregular shapes, thereby improving the quality of the welds.
Implementation Method 1
the vibrations that the head of the sonotrode transmits onto the components to be welded causes the heating of the same, thus allowing the welding
Implementation Method 2
uses high-frequency sound energy to fuse plastic materials to each other at a welding zone
Data Source
Figure 1~4
Figure 5A~6
Figure 7
AI summary
The invention relates to a sonotrode (1) for the ultrasonic welding of plastic components (G, B) of an electronic cigarette. The sonotrode (1) comprises: a body (10) comprising a first end (2) which can be connected to an ultrasound generator, and a second end (3); a cavity (4) that develops from the second end (2) towards the first end, for receiving at least partially a plastic component (G) of an electronic cigarette to be welded. The cavity (4) defines an opening (5) at the second end (3) of the body (10), communicating with the outside of the sonotrode (1). In particular, at the opening (5), the cross section of the cavity (4) has an outline comprising: a first portion (6) that has the shape of a first arc of a reference circumference (C1), which comprises a first end (61) and a second end (62), opposite each other; and a second portion (7), that has the shape of a second arc of said reference circumference (C1), which comprises a first end (71) and a second end (72), opposite each other. The aforementioned outline further comprises: a third portion (8), connected to the first end (61) of the first portion (6) and to the first end (71) of the second portion (7), which develops externally with respect to the reference circumference (C1); and a fourth portion (9), connected to the second end (62) of the first portion (6) and to the second end (72) of the second portion (7), which develops externally with respect to said reference circumference (C1).