Drilling Entry Sheet with Molybdenum Disulfide Lubrication
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Solution Overview
Problem
The progress of printed wiring board technology lags behind semiconductor technology, with demands for high densification, improved reliability, and reduced costs, and existing entry sheets for drilling do not adequately meet these requirements, particularly in terms of hole position accuracy and drill bit durability.
Innovation Solution
An entry sheet for drilling is developed with a metallic support foil and a resin composition layer containing 70-130 parts by mass of molybdenum disulfide as a solid lubricant, optimized for improved hole position accuracy and lubrication, where the molybdenum disulfide has a purity of 85% or more and an average particle diameter of 1-20 μm, enhancing the centrality and wear resistance of the drill bit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional entry sheets for drilling are used, then basic drilling function is provided, but hole position accuracy is insufficient
Solution Approach 1:
The entry sheet employs a composite structure consisting of a resin layer containing molybdenum disulfide particles and a metal foil support layer. This composite material design combines the lubricating properties of molybdenum disulfide with the mechanical strength of metal foil, simultaneously improving hole position accuracy through reduced friction and drill bit durability through structural support.
Solution Approach 2:
The invention optimizes specific parameters including molybdenum disulfide particle size (0.1-10 μm), particle content (1-50 parts by mass per 100 parts resin), and resin layer thickness (1-10 μm). These parameter optimizations enhance the lubricating effect while maintaining structural integrity, thereby improving both hole position accuracy and drill bit durability.
2Manufacturing precision
If drilling is conducted without adequate lubrication, then drilling process is simple, but drill bit wear increases and hole position accuracy deteriorates
Solution Approach 1:
The invention applies lubrication locally at the drilling interface by incorporating molybdenum disulfide particles specifically in the resin layer that contacts the drill bit. This localized approach provides enhanced lubrication exactly where needed at the drill-bit entry point, improving hole position accuracy without requiring complex lubrication systems throughout the entire structure.
3Manufacturing precision
If molybdenum disulfide is added to resin composition, then lubrication is improved and hole position accuracy increases, but manufacturing complexity increases
Solution Approach 1:
The invention establishes specific parameter ranges for manufacturability: molybdenum disulfide particle size of 0.1-10 μm, particle content of 1-50 parts by mass per 100 parts resin, and layer thickness of 1-10 μm. These optimized parameters ensure adequate lubrication performance while maintaining feasibility for conventional manufacturing processes, balancing hole position accuracy improvement with ease of manufacture.
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 entry sheet significantly improves hole position accuracy and reduces drill bit breakage by maintaining the solid state of molybdenum disulfide at drilling temperatures, ensuring effective lubrication and preventing chip accumulation, thereby enhancing productivity and reducing costs.
Implementation Method 1
the resin composition contains 70 parts by mass to 130 parts by mass of molybdenum disulfide as a solid lubricant based on 100 parts by mass of the resin
Implementation Method 2
maintaining the solid state of molybdenum disulfide at drilling temperatures
Data Source
AI summary
The present invention provides an entry sheet for drilling excellent in hole position accuracy compared with the conventional entry sheet for drilling. Such an entry sheet for drilling is an entry sheet for drilling comprising metallic support foil and a layer comprising a resin composition formed on at least one surface of the metallic support foil, in which the resin composition contains a resin and 70 parts by mass to 130 parts by mass of molybdenum disulfide based on 100 parts by mass of the resin, and the layer comprising the resin composition has a thickness in a range from 0.02 to 0.3 mm.