Abstract
This work evaluates the viability of applying Friction Riveting as an alternative for the assembly of components on printed circuit boards (PCBs). The popular press-fit technology for assembling components on PCBs consists of a pin inserted tightly into a relatively smaller hole, resulting in good electrical and mechanical properties. However, some limitations are highlighted, such as numerous processing steps and the need for predrilled holes. Friction Riveting is based on mechanical fastening and friction welding principles, where polymeric components are joined with metallic rivets through frictional heating and pressure. The main benefits of using Friction Riveting in PCBs compared with fit-press are (i) a reduced number of processing steps and (ii) shorter joining cycles, because there is no pre-drilling involved with fasteners anchored within the PCB in a single step. The joints were manufactured using 5 mm diameter AA-2024-T3 rivets and 1.5 mm thick glass-fiber-reinforced epoxy laminates (FR4-PCB). It is shown for the first time that it is possible to deform metallic rivets within thin composite plates at a reduced diameterto-thickness ratio. The feasibility study followed a one-factor-a-time approach for parameter screening and optical microscopy assessed joint formation of the deformed rivets inside the laminates through volumetric ratio (VR). The joints present significant deformation (VR=0.5) at the tip of the rivet inserted into overlapped PCBs plates, with thicknesses below 3.0 mm, which is considered the lowest achieved so far with Friction Riveting.
Highlights
Most modern electronic circuits in the industry are manufactured using printed circuit boards (PCBs)
Much improved joints were achieved for Condition 2 (AA-2024-T3 rivet and FR4-PCB single copper layer), see Fig. 5b
A significant volumetric ratio (VR = 0.50 ± 0.02) was achieved at anchoring depths below 3.0 mm, the lowest thickness achieved with the Friction Riveting process so far
Summary
Most modern electronic circuits in the industry are manufactured using printed circuit boards (PCBs). The PCBs are produced from glass-fiber-reinforced epoxy laminate with multiple copper layers. The cooper layers link the electronic components together, forming a circuit. The present work intends to contribute to the mounting techniques for PCB post assembly. For mounting electronic components in PCBs, fastening processes are commonly used based on drilling holes through the board to place them or attach various electrical components [1]. The Friction Riveting technique is proposed as an alternative to the press-fit technology for the assembly of components in PCBs. The frequently used press-fit technology for assembling of components on PCBs is a solder-free electrical assembly process. A pin is generally inserted tightly into a slightly smaller hole; the interference generated is enough
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