Tapered Solder Pin Assembly for Precise PCB Positioning
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Solution Overview
Problem
Existing solder pin and soldering point assemblies in through-hole reflow technology suffer from positional tolerances, leading to potential tilting and offsetting of components on printed circuit boards, which compromises precise positioning and secure fixation.
Innovation Solution
The solder pin features an insertion portion with insertion walls angled at an acute angle, allowing it to taper and center itself within the soldering point opening, reducing positional deviations and enabling precise alignment without force, even when initially inserted without contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a solder pin with standard cylindrical shape is used, then the assembly process is simple, but positional tolerance cannot be reduced leading to component tilting and offsetting
Solution Approach 1:
The solder pin features an asymmetric insertion portion with insertion walls at an acute angle (e.g., 60 degrees) relative to the pin axis, creating a tapered geometry that is asymmetric in cross-section. This asymmetric shape enables automatic centering within the circular opening of the soldering point, reducing positional tolerance from ±0.2 mm to significantly tighter tolerances, while the rest of the pin maintains a standard cylindrical shape for manufacturing simplicity.
2Ease of operation
If clearance is provided between solder pin and opening, then insertion is easier, but component fixation precision deteriorates due to tilting and offsetting
Solution Approach 1:
The insertion portion of the solder pin employs a curved, tapered surface with insertion walls inclined at an acute angle, creating a conical or frustoconical geometry. This curved surface guides the pin into the circular opening, allowing easy insertion while simultaneously providing mechanical guidance that eliminates tilting and ensures precise centering, thus maintaining both ease of insertion and positioning precision.
3Manufacturing precision
If tighter tolerances are imposed on solder pin and opening, then positioning accuracy improves, but manufacturing complexity and cost increase
Solution Approach 1:
The solder pin is designed with local geometric modification only at the insertion portion, where insertion walls at an acute angle create a tapered shape. The remainder of the pin maintains standard cylindrical geometry with conventional tolerances. This localized modification achieves tight effective tolerances at the critical insertion interface without requiring tight tolerances throughout the entire pin, thus reducing manufacturing complexity and cost.
Data Source
AI summary
An assembly is provided. The assembly includes a component, a solder pin arranged on the component, an electrical structural unit, and a soldering point which is arranged on the electrical structural unit and forms an opening, into which the solder pin is insertable along an insertion direction in order to produce a soldered joint. The solder pin has an insertion portion which, on sides of the solder pin that face away from each other, forms insertion walls which are arranged at an acute angle to one another in such a way that the insertion portion tapers in the insertion direction. A part of the insertion portion is arranged outside the opening in such a way that one or more portions of the insertion walls extend inside the opening and one or more portions of the insertion walls extend outside the opening.