Rotary Cutting Tool Coolant Cap Threaded Mounting

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Solution Overview

Problem

Conventional rotary cutting tools experience coolant leakage due to failure of threaded fasteners when high-pressure coolant flow is applied, which hinders effective delivery to cutting inserts.

Innovation Solution

A coolant cap with external threads is designed to securely mount onto the cutter body, creating a snug fit and utilizing a sealing member to prevent leakage, allowing high-pressure coolant delivery to cutting inserts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If threaded fasteners are used to mount the coolant cap to the cutter body, then the coolant cap can be securely mounted, but the fasteners fail under high-pressure coolant flow causing leakage

Engineering Contradiction:

Improvecoolant delivery reliabilityVSAvoidfastener strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent removes the threaded fasteners from the mounting system entirely. Instead of using separate fasteners to attach the coolant cap to the cutter body, the system uses a press-fit interface where the coolant cap is directly inserted into a recess in the cutter body, eliminating the fasteners that were failing under high pressure

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The mounting function and sealing function are merged into a single integrated solution. The coolant cap itself serves as both the mounting element and the sealing element, combining what were previously separate functions (fastening and sealing) into one component that cannot fail due to fastener degradation

Inventive Principle:

Principle #5Merging (Combining)

2Productivity

If high-pressure coolant flow is delivered to the cutting inserts, then cooling effectiveness is improved, but threaded fasteners fail causing coolant leakage

Engineering Contradiction:

Improvecoolant delivery efficiencyVSAvoidmounting reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent replaces the mechanical fastening system (threaded fasteners) with a press-fit mechanical interference system. The coolant cap is designed with an outer diameter that creates interference fit with the recess in the cutter body, providing a mounting system that can withstand high-pressure coolant flow without the complexity and failure modes of threaded fasteners

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the mounting parameters from threaded engagement to press-fit engagement. By altering the dimensional parameters of the coolant cap outer surface and the recess inner surface to create an interference fit, the system achieves reliable mounting under high pressure without requiring threaded fasteners that are susceptible to failure

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9833846B2Rotary cutting tool with high-pressure, threaded coolant cap

Publication Date: 2017.12.05 KENNAMETAL INC

AI summary

A rotary cutting tool includes a cutter body and a coolant cap removably secured to the cutter body. The coolant cap includes an outer surface, an inner surface and a generally cylindrical outer surface extending between the outer surface and the inner surface. The cylindrical outer surface has a second cylindrical outer surface portion with external threads formed thereon such that the coolant cap is capable of being threaded onto the cutter body.