Thermal Caulking Heat Tip Non-Uniform Thickness
Solution Overview
Problem
Thermal caulking devices experience uneven current distribution in the electrode tip, leading to non-uniform temperature and potentially reduced joining strength due to insufficient melting of resin.
Innovation Solution
The thermal caulking device features a heat tip with a main body section and terminal sections of non-uniform thickness, where the cross-sectional area varies to control heat generation, ensuring more uniform heat distribution and preventing uneven melting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrode tip is formed with uniform thickness, then the manufacturing is simple, but the current distribution becomes uneven leading to non-uniform temperature
Solution Approach 1:
The electrode tip is designed with non-uniform thickness where specific portions have different thicknesses to create localized variations in resistance. This allows different regions of the electrode tip to generate different amounts of heat, compensating for uneven current distribution and achieving uniform temperature across the entire electrode tip surface.
Solution Approach 2:
The thickness parameter of the electrode tip is deliberately varied in predetermined directions to control the resistance distribution. By changing the geometric parameter (thickness) in specific regions, the electrical resistance is adjusted to balance the heat generation across different portions of the electrode tip, resolving the temperature uniformity issue.
2Manufacturing precision
If the electrode tip has non-uniform thickness, then the temperature distribution becomes uniform, but the manufacturing complexity increases
Solution Approach 1:
Rather than making the entire electrode tip complex, only specific portions are designed with non-uniform thickness while other portions maintain uniform thickness. This localized approach achieves temperature uniformity without unnecessarily increasing the overall structural complexity of the device.
Solution Approach 2:
The electrode tip incorporates asymmetric thickness variations in predetermined directions to compensate for the symmetric but uneven current distribution. This controlled asymmetry in geometry creates the necessary resistance variation to balance heat generation, achieving uniform temperature with minimal structural modification.
3Power
If the current distribution is uneven, then the heat generation becomes non-uniform, but increasing the cross-sectional area reduces heat generation
Solution Approach 1:
The cross-sectional area (thickness) of the electrode tip is varied in predetermined directions to control the resistance and heat generation. In regions where current is high, the thickness is increased to reduce resistance and heat generation, while in regions where current is low, the thickness is decreased to increase resistance and heat generation. This parameter variation achieves uniform heat generation and consistent melting across the electrode tip.
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
This design achieves reliable thermal caulking by minimizing heat generation deviations across the heat tip, resulting in consistent melting and improved joining strength.
Implementation Method 1
at least either of the main body section and the terminal sections is formed with non-uniform thickness in a predetermined direction such that the deviation of the amounts of heat generation in the individual portions of the main body section generating heat by the electricity supplied from the power supply unit becomes small
Implementation Method 2
a thermal caulking device which joins a first member to a second member by melting a boss of the second member being inserted into a through-hole formed in the first member
Implementation Method 3
melting a boss of the second member being inserted into a through-hole formed in the first member
Data Source
AI summary
The first electrode section (7a) and the second electrode section (7b) are formed such that the outer portion connected to the upper portion of the heating section (6) is thinner than the inner portion connected to the lower portion of the heating section (6). The heating section (6) and the first electrode section (7a) are interconnected by an R-shaped first connecting portion (21). The inner circumferential sloping surface of the heating section (6) and the second electrode section (7b) are interconnected by an R-shaped second connecting portion (22). The first and second connecting portions (21)(22) are formed such that R becomes larger from the upper end to the lower end, where the upper portion is thin and the lower portion is thick. The thickness of an intermediate portion (6b) is smaller than the thicknesses of the first and second connecting portions (21)(22).