Polymer-Coated Lubrication Board for PCB Drilling Precision
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Solution Overview
Problem
Conventional lubrication boards fail to provide adequate lubrication, leading to reduced hole precision and shortened service life of drill bits in drilling processes, particularly in high-frequency and miniaturized circuit board applications.
Innovation Solution
A lubrication board with a substrate coated by a polymer layer expressed by formula (I), comprising diisocyanate-derived structural units, polyol, 2,2-dimethylol propionic acid, amino polyethylene glycol, and polyethylene glycol, which enhances lubrication and extends drill bit service life by forming a stable emulsion that improves drilling accuracy and reduces wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lubrication boards are used, then manufacturing cost is controlled, but lubrication effect is insufficient leading to reduced hole precision and shortened drill bit service life
Solution Approach 1:
The patent modifies the chemical structure of polyethylene glycol by introducing amino groups at terminal positions and varying molecular weights (200-20000), thereby changing the lubrication parameters to achieve superior drilling performance without compromising drill bit service life
Solution Approach 2:
The invention creates a composite lubrication layer combining modified polyethylene glycol with polyisocyanate and polyol, forming a polyurethane resin system that integrates multiple functional properties including lubrication, adhesion, and material lifting capabilities
2Reliability
If high-molecular-weight PEG is introduced to improve lubrication, then lubrication effect increases, but gel-like by-products form limiting further PEG addition
Solution Approach 1:
The patent extracts and modifies specific terminal groups of polyethylene glycol by introducing amino groups, thereby separating the lubrication function from the gel-forming tendency and enabling unlimited PEG addition without composition instability
Solution Approach 2:
The modified polyethylene glycol with amino terminal groups acts as an intermediary that reacts with polyisocyanate to form stable polyurethane resin, preventing direct gel formation while maintaining lubrication benefits of high-molecular-weight PEG
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
The polymer-coated lubrication board significantly improves hole precision and extends the service life of drill bits, as demonstrated by increased Cpk values and reduced residual material on drill bits during drilling tests compared to conventional boards.
Implementation Method 1
the most important goals include increasing the lubrication between a coating drill bit and a board, extending the service life of the coating drill bits
Implementation Method 2
modifying polyethylene glycol to react with polyisocyanate, forming a stable aqueous polyurethane resin that prevents gel-like by-products
Implementation Method 3
decrease wear and tear of drill bits, improving the capability of the coating drill bits to lifts material up the holes and out of the way
Data Source
AI summary
A lubrication board includes a substrate; and a lubrication layer disposed on a surface of the substrate, wherein the lubrication layer comprises a polymer expressed by formula (I) below,formula (I); wherein R1 is selected from a substituted or unsubstituted C2-C18 alkyl or C2-C18 aryl; R2 is selected from a substituted or unsubstituted C2-C18 alkyl or C2-C18 alkyl which is interrupted by —O—; R3 is selected from —NH— or —S—; R4 is selected from —NH2, —OH or —SH; and n, p and q are positive integers ranging from 2 to 20000.