Cutting Blade Clamping Bore for Coolant Sealing in Thin Grooving Tools
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Solution Overview
Problem
Existing coolant systems for metal machining tools face challenges in efficiently providing coolant to the cutting edge of thin cutting blades, particularly in grooving and parting off operations, due to complications arising from the thin width of the blades.
Innovation Solution
A cutting blade design featuring a first blade bore with a peripheral surface that includes an entry gap recessed further than the bore abutment sub-surface from the blade bore axis, allowing for secure attachment to a blade holder using a commercially available clamping screw without additional sealing components, while maintaining a fluid connection for coolant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a thin cutting blade is used to reduce wastage, then material efficiency is improved, but coolant delivery to the cutting edge becomes difficult
Solution Approach 1:
The coolant inlet is positioned on the peripheral surface of the blade rather than on the thick face, utilizing the thin dimension of the blade to achieve coolant delivery. The inlet opens into the blade bore from the peripheral surface, allowing coolant to reach the cutting edge through the thin blade structure without requiring additional thickness.
2Reliability
If additional sealing components are added to seal the cutting blade, then sealing reliability is improved, but device complexity increases
Solution Approach 1:
The sealing function is merged with the fastening screw itself. The screw acts as both the clamping element to secure the blade and the sealing element to prevent coolant leaks. The screw threads engage with threaded bores in both the blade holder and blade, creating a sealed connection without requiring separate sealing components.
Solution Approach 2:
The fastening screw performs multiple functions simultaneously: it clamps the cutting blade to the blade holder, seals the coolant passage, and provides the mechanical connection. This multi-functional design eliminates the need for separate sealing rings or O-rings.
3Ease of operation
If the coolant inlet is positioned close to the cutting edge, then coolant effectiveness is improved, but blade thickness must be increased
Solution Approach 1:
Instead of positioning the coolant inlet on the face of the blade (which would require increased thickness), the inlet is positioned on the peripheral surface. This allows the coolant to enter the blade bore from the side and reach the cutting edge through the internal bore, achieving effective coolant delivery without increasing blade thickness.
Data Source
AI summary
A cutting tool with a coolant system having a cutting blade, a cutting insert and a blade holder. The cutting blade has a first blade bore having a first bore peripheral surface and an entry gap recessed therein. On assembling the cutting tool, a fastening element clamps the first bore peripheral surface and seals the first blade bore, releasably securing the cutting blade to the blade holder and allowing a fluid connection between the blade holder and the cutting blade.