Internal Coolant Nozzle Channels for Grinding Wheel Cooling

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Solution Overview

Problem

Traditional external coolant injection systems for grinding operations are insufficient due to the air barrier created by high-speed grinding wheels, leading to surface burning and the need for expensive specialized consumable grinding wheels.

Innovation Solution

A coolant nozzle system that delivers coolant to the interior of the grinding wheel through a threaded cylindrical shank and multiple angled coolant channels, providing uniform cooling at various stages of erosion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If external coolant injection is used on the outer surface of the grinding wheel, then the cooling system is simple to implement, but the coolant flow is insufficient due to the air barrier created by high-speed rotation

Engineering Contradiction:

Improvecoolant injection systemVSAvoidcooling effectiveness

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

Instead of injecting coolant externally on the outer surface of the grinding wheel, the patent inverts the approach by injecting coolant internally through the grinding wheel's structure. The coolant is delivered through channels formed within the grinding wheel body, allowing direct contact with the grinding interface without being blocked by the air barrier generated during high-speed rotation.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces an intermediary cooling structure - internal coolant channels - that mediate between the coolant supply system and the grinding interface. These channels act as a conduit to deliver coolant directly to the critical cooling zone, bypassing the air barrier problem that plagues external injection systems.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Temperature

If internally cooled grinding wheels are designed with specialized structures, then superior coolant flow and temperature control are achieved, but the manufacturing cost increases

Engineering Contradiction:

Improvegrinding zone temperatureVSAvoidgrinding wheel manufacturing

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The patent utilizes porous or channelled structures within the grinding wheel body to facilitate internal coolant flow. These internal passages allow coolant to permeate through the wheel structure and reach the grinding interface, achieving superior temperature control while maintaining a manageable manufacturing process through conventional drilling and channel formation techniques.

Inventive Principle:

Principle #31Porous materials

3Duration of action of stationary object

If coolant is delivered to multiple locations on the grinding wheel, then cooling effectiveness is maintained throughout erosion, but the nozzle structure becomes more complex

Engineering Contradiction:

Improvegrinding wheel service lifeVSAvoidnozzle structure

Core Design Contradiction:

Duration of action of stationary objectVSDevice complexity

Solution Approach 1:

The patent segments the coolant delivery system into multiple separate channels or nozzles positioned at different locations on the grinding wheel. Each channel targets a specific zone, ensuring comprehensive cooling coverage as the wheel erodes and the grinding interface shifts. This segmentation allows independent optimization of each coolant delivery path.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent extends coolant delivery from a single-point injection to multi-point injection distributed across different spatial dimensions on the grinding wheel surface. By positioning coolant delivery channels at various radial and axial locations, the system maintains effective cooling throughout the wheel's service life and erosion cycle.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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

Enhances coolant flow and temperature control, improving grinding performance while reducing the need for specialized grinding wheels by using existing systems.

Implementation Method 1

A central coolant channel may run axially through the shank and partially through the nozzle head. The nozzle head may further include coolant delivery channels extending radially outward from the central coolant channel.

Methodology Applied

Scientific EffectFluid flow through channels:

Implementation Method 2

heat builds up between the workpiece and the abrasive grinding surface, which requires cooling... Internally cooling the grinding wheel provides superior flow of the coolant and thus results in lower temperatures

Methodology Applied

Scientific EffectHeat absorption:

Data Source

PatentUS20260048479A1Grinding wheel coolant nozzle

Publication Date: 2026.02.19 ROLLS ROYCE CORP

AI summary

An example coolant nozzle includes a cylindrical shank having a first axial end and a second axial end; a nozzle head extending from the second axial end of the cylindrical shank; a central coolant channel extending from a central axis of the first axial end of the cylindrical shank to partially through a central axis of the nozzle head; and at least one first coolant delivery channel extending radially outward from the central coolant channel to an outer wall of the nozzle head.