3D-Printed Wave Solder Pallets for Precise PCB Solder Flow
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Solution Overview
Problem
Current wave solder pallets suffer from wear-related health and performance issues and are limited in their ability to control solder flow due to their inability to be manufactured with complex geometries, leading to problems such as solder clogging, uneven flow, and improper connections in Printed Circuit Board Assemblies (PCBAs).
Innovation Solution
The development of wave solder pallets with complex geometries, manufactured using 3D printing, which are designed to optimize solder flow by controlling the speed, acceleration, volume, and direction of solder through channels, tunnels, and ramps, ensuring the correct amount of solder is applied in the right locations for the right duration, thereby enhancing the reliability of connections between pin-through-hole components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional wave solder pallets are used, then manufacturing simplicity is maintained, but solder flow control is insufficient leading to clogging and uneven flow
Solution Approach 1:
The pallet is divided into multiple functional zones with distinct geometries including channels, tunnels, and ramps. These segmented structures guide solder flow through specific pathways, preventing clogging and ensuring uniform distribution across the PCB underside.
Solution Approach 2:
The invention transitions from flat, two-dimensional pallet surfaces to three-dimensional structures with channels, tunnels, and ramps. This dimensional enhancement enables complex solder flow control that was impossible with traditional planar designs, allowing optimization of flow velocity and direction.
2Manufacturing precision
If traditional manufacturing methods are used for pallets, then manufacturing ease is maintained, but complex geometries cannot be achieved limiting solder flow optimization
Solution Approach 1:
The invention changes the manufacturing parameter from traditional subtractive or formative methods to additive manufacturing (3D printing). This parameter change enables the creation of complex internal geometries like channels and tunnels that would be impossible or extremely difficult to achieve with conventional manufacturing processes.
Solution Approach 2:
The invention replaces traditional mechanical manufacturing processes (milling, drilling, shaping) with 3D printing technology. This substitution enables direct fabrication of complex geometries from digital models, eliminating the need for multiple manufacturing steps and tooling.
3Reliability
If traditional pallets are used, then cost is reduced, but wear-related health and performance issues occur
Solution Approach 1:
The invention utilizes composite or specialized materials suitable for 3D printing that provide both the necessary mechanical strength and resistance to solder-induced wear and corrosion. These materials maintain pallet performance over extended use while the additive manufacturing process keeps costs competitive.
Solution Approach 2:
The 3D printing process enables economical production of pallets that can be manufactured at lower cost, potentially allowing for replacement rather than repair. This approach trades initial manufacturing cost for long-term reliability and reduced maintenance costs.
4Reliability
If simple pallet geometries are used, then manufacturing ease is maintained, but solder flow cannot be optimized causing connection errors
Solution Approach 1:
Different regions of the pallet are given different geometric characteristics tailored to local solder flow requirements. Channels provide directed flow paths, tunnels create controlled circulation patterns, and ramps manage flow velocity - each local geometry optimized for its specific function to ensure reliable connections.
Data Source
AI summary
A method of manufacturing a pallet for use during manufacture of a printed circuit board assembly includes determining optimal solder flow for establishing connections between lead pins of a plurality of pin-through-hole components arranged on a circuit board, designing a pallet to include geometries configured to provide the optimal solder flow when the pallet, supporting the circuit board thereon, is passed through a wave solder machine, and creating the pallet based on the design. Pallets configured for optimal solder flow and methods of manufacturing printed circuit board assemblies using such pallet are also provided.