Cutter Fastening Component With Integrated Coolant Flow Paths

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Solution Overview

Problem

Existing fastening components for rotary cutting tools often result in uneven coolant distribution to cutting locations, leading to structural complexity and increased component count.

Innovation Solution

A fastening component with a shaft part having a first flow path in the shaft center, connected via a second flow path to multiple third flow paths, allowing for efficient fluid distribution to cutting locations without additional components or complex machining.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple flow paths are branched out from a single flow path to spray coolant to cutting locations, then coolant distribution coverage is improved, but the head becomes thick and structure becomes complex

Engineering Contradiction:

Improvecoolant distribution coverageVSAvoidhead thickness and structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The invention divides the single flow path into multiple separate flow paths (first flow path, second flow path, third flow path) that are distributed throughout the shaft part. Each flow path independently supplies coolant to different cutting locations, achieving segmented coolant distribution without requiring a thick head structure with branched passages.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of branching flow paths within the head thickness dimension (z-axis), the invention extends flow paths along the shaft length dimension (y-axis) and radial dimension (x-axis). The first flow path is formed in the shaft center, the second flow path connects to it, and the third flow path opens away from the shaft center, creating a three-dimensional distribution network that avoids head thickening.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If a lid is attached to the head to form an ejection passage, then coolant ejection capability is improved, but the number of components increases and structure becomes complicated

Engineering Contradiction:

Improvecoolant ejection capabilityVSAvoidnumber of components

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The invention merges the coolant ejection function into the shaft part itself by forming the first, second, and third flow paths directly within the shaft part material. The shaft part simultaneously serves as the fastening component and the coolant distribution system, eliminating the need for separate lids or ejection passage components.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The shaft part is designed to be self-sufficient by integrating multiple functions: fastening (through the shaft part structure), coolant supply (through the first flow path), and coolant ejection (through the third flow path). The shaft part serves itself as both the structural component and the fluid distribution system, eliminating dependencies on additional components.

Inventive Principle:

Principle #25Self-service

3Productivity

If flow paths are formed in the shaft part, then coolant supply capability is improved, but strength of the shaft part may be reduced

Engineering Contradiction:

Improvecoolant supply capabilityVSAvoidshaft part strength

Core Design Contradiction:

ProductivityVSStrength

Solution Approach 1:

The invention applies local quality by forming flow paths in specific locations within the shaft part where they least interfere with overall strength. The first flow path is formed in the shaft center, the second flow path connects to it, and the third flow path opens away from the shaft center. This strategic positioning minimizes cross-sectional area reduction in critical load-bearing regions while maintaining effective coolant delivery to cutting zones.

Inventive Principle:

Principle #3Local quality

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 described fastening component ensures appropriate coolant distribution to cutting locations, preventing structural complexity and reducing the number of components, while maintaining strength and facilitating miniaturization.

Implementation Method 1

a first flow path formed in a shaft center of the shaft part and opened in an end surface of the shaft part which is fastened to the arbor

Methodology Applied

Scientific EffectFluid flow through flow paths:

Implementation Method 2

a second flow path connecting the first flow path and the third flow path

Methodology Applied

Scientific EffectFluid flow through connecting passages:

Implementation Method 3

a third flow path opened, in a position that is away from the shaft center, in an end that is opposite to an end that is fastened to the arbor

Methodology Applied

Scientific EffectFluid ejection to cutting location:

Data Source

PatentUS20250187079A1Fastening component

Publication Date: 2025.06.12 TUNGALOY CORP

AI summary

A fastening component that is fastened to an arbor so as to fix a cutter, being a rotary cutting tool, to the arbor, the fastening component including: a shaft part screwed into an internal thread of the arbor; an engagement hole formed in a shaft center of an end surface that is opposite to an end surface that is fastened to the arbor; a first flow path formed in a shaft center of the shaft part and opened in an end surface of the shaft part which is fastened to the arbor; a third flow path opened, in a position that is away from the shaft center, in an end that is opposite to an end that is fastened to the arbor; and a second flow path connecting the first flow path and the third flow path.