Multi-Axis Shaping With Cryogenic Cooling for Deep Feature Machining

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Solution Overview

Problem

Milling processes for machining complex aerospace components face limitations due to the need for rotationally symmetrical cutting tools, which result in tool deflection and vibration, and the challenges of heat management and thermal contraction, particularly in high-speed machining of advanced alloys.

Innovation Solution

A high-speed, multi-axis shaping process using state-of-the-art linear direct drive servo motors and external cryogenic cooling, enabling multi-axis linear movement without continuous tool rotation, allowing for favorable tool geometries and effective cooling, with a control system to manage jerk motion and avoid collisions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If rotationally symmetrical cutting tools are used in milling processes, then the tools can rotate at high speed, but tool deflection and vibration increase due to unfavorable tool length to diameter ratios

Engineering Contradiction:

Improverotational speedVSAvoidtool stability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent inverts the conventional milling approach by using linear reciprocating motion instead of rotational motion. The cutting tool moves linearly back and forth while the workpiece rotates on multiple axes, eliminating tool deflection and vibration associated with high-speed rotation of long slender tools.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent replaces the rotational mechanical system with a linear reciprocating mechanical system. Instead of rotating the tool at high speed, the tool reciprocates linearly at high speed with multi-axis motion control, fundamentally changing the mechanics of the cutting process.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Temperature

If liquid nitrogen is delivered through the rotating spindle and tool for cryogenic cooling, then cooling effectiveness improves, but expensive rotary unions are required and thermal management issues arise

Engineering Contradiction:

Improvecooling effectivenessVSAvoidrotary union requirements

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The patent extracts the cryogenic cooling delivery from the rotating spindle system and delivers liquid nitrogen externally to the cutting zone. This eliminates the need for rotary unions and internal cooling channels, simplifying the system while maintaining cooling effectiveness.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent uses the workpiece itself as an intermediary to transfer cooling to the cutting zone. Liquid nitrogen is delivered externally and cools the workpiece at the cutting interface, eliminating the need for complex internal cooling systems in the tool or spindle.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If high feed per tooth is used to increase material removal rate, then productivity improves, but excessive deflection and vibration cause rubbing instead of cutting

Engineering Contradiction:

Improvematerial removal rateVSAvoidcutting quality

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent inverts the conventional approach by using linear reciprocating tool motion with multi-axis workpiece rotation instead of rotational tool motion. This allows high feed rates without tool deflection, achieving both high productivity and excellent surface finish in a single operation.

Inventive Principle:

Principle #13The other way round (Inversion)

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

Achieves significantly higher material removal rates, improved surface integrity, and reduced tool wear by eliminating thermal contraction and vibration, while producing complex geometries efficiently.

Implementation Method 1

state-of-the-art linear direct drive servo motors

Methodology Applied

Scientific EffectElectromagnetic force: Lorentz Force

Implementation Method 2

external cryogenic cooling

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 3

eliminating thermal contraction

Methodology Applied

Scientific EffectThermal contraction: Thermal Contraction

Data Source

PatentUS20250353085A1High speed multi-axis machine tool

Publication Date: 2025.11.20 UNIVERSITY OF KENTUCKY RESEARCH FOUNDATION

AI summary

An apparatus and method are provided for three dimensional cutting of a multi-axis feature into a workpiece that are at least partially characterized by a lack of rotationally symmetrical tools and an ability to produce high aspect ratio (depth to diameter) features using mechanical machining. The apparatus includes a base, a displaceable machine table supported on that base, a displaceable spindle supported on the base adjacent the machine table, a cutting tool held in a chuck carried on the spindle and a control module. The control module includes a controller and a plurality of actuators to provide precise displacement of the machine table, spindle, cutting tool and the workpiece for cutting multi-axis surface features into the workpiece.