Post-Press Heating for Reliable Press-Fit Connector Bonding
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Solution Overview
Problem
Press-fit connections on substrate boards are sensitive to manufacturing variations, leading to inconsistent bonding and structural integrity issues due to material imperfections and tolerances, which can result in air gaps, signal integrity loss, and increased costs from damaged components or the need for additional soldering.
Innovation Solution
Applying targeted heat to press-fit connections after the press-fit process, known as post-press heating, to enhance bonding between press-fit elements and through-hole walls, using a heat-application plan that can involve global or localized heating, and monitoring temperature to ensure effective bonding without damaging temperature-sensitive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If press-fit elements are inserted into through holes with normal force to create mechanical bonds and welding bonds, then structural integrity and electrical connectivity are improved, but manufacturing precision deteriorates due to sensitivity to material imperfections and tolerances
Solution Approach 1:
The patent applies post-press heating to change the thermal parameter of the press-fit connection, heating the assembly to facilitate metallurgical bonding between the press-fit element and through-hole wall. This thermal parameter change compensates for manufacturing variations and material imperfections, ensuring consistent bonding strength regardless of initial dimensional tolerances.
Solution Approach 2:
The patent performs heating action after the press-fit insertion is complete. This preliminary bonding preparation ensures that the mechanical insertion is first established, then followed by thermal enhancement to create robust metallurgical bonds, addressing the inconsistency caused by varying insertion forces and material tolerances.
2Reliability
If higher normal force is applied during press-fit insertion to ensure gastight bond, then reliability is improved, but device complexity increases due to need for precise force control and additional soldering processes
Solution Approach 1:
The patent replaces the need for complex mechanical force control systems with a simpler thermal processing system. Instead of precisely controlling insertion forces to achieve reliable bonds, the method uses post-press heating to create metallurgical bonds that are more forgiving of mechanical variation, thereby reducing process complexity while maintaining or improving reliability.
Solution Approach 2:
The patent utilizes phase transitions in the material during heating - specifically, the transition to austenite phase in stainless steel press-fit elements - to facilitate metallurgical bonding. This phase transition mechanism provides a more reliable bonding pathway that is less sensitive to mechanical insertion variations, reducing the need for complex force control.
3Manufacturing precision
If additional soldering is performed to ensure bonding, then manufacturing precision is improved, but productivity decreases due to increased process time and cost
Solution Approach 1:
The patent merges the bonding function into a single post-press heating step that simultaneously achieves metallurgical bonding between the press-fit element and through-hole wall. This consolidated approach eliminates the need for separate soldering operations, maintaining bonding consistency while improving manufacturing throughput and reducing process complexity.
4Ease of manufacture
If friction heat during insertion is relied upon for bonding, then ease of manufacture is improved, but temperature control precision deteriorates leading to inconsistent bonding
Solution Approach 1:
The patent performs heating as a separate, controlled step after insertion is complete. This allows preliminary mechanical insertion to proceed simply without complex temperature control, followed by a dedicated thermal processing step where temperature can be precisely controlled and monitored to ensure consistent metallurgical bonding.
Solution Approach 2:
The patent implements temperature monitoring and control during the post-press heating process. By measuring the actual temperature and adjusting heating parameters accordingly, the system achieves precise temperature control that compensates for variations in friction heat generation during insertion, ensuring consistent bonding results.
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 method increases the structural integrity and electrical connectivity of press-fit connections, reduces susceptibility to environmental impurities, and decreases manufacturing costs by improving bonding without the need for additional soldering, while maintaining signal integrity.
Implementation Method 1
Applying targeted heat to press-fit connections after the press-fit process, known as post-press heating, to enhance bonding between press-fit elements and through-hole walls
Implementation Method 2
The friction created by this rubbing may create enough heat to cause the metal of the press-fit element and the metal of the side of the through hole to form welding bonds
Implementation Method 3
The friction created by this rubbing may create enough heat to cause the metal of the press-fit element and the metal of the side of the through hole to form welding bonds
Implementation Method 4
applying heat to the press-fit element... withdrawing heat from the press-fit element
Data Source
AI summary
A method comprises inserting a press-fit element into a through hole on a substrate board. The method also comprises obtaining a target heat-application plan for the press-fit element. The method also comprises applying heat to the press-fit element. The method also comprises determining that the target heat-application plan has been completed. The method also comprises withdrawing heat from the press-fit element.