Cryogenic Toolholder Insulation and Sealing for Internal Jet Cooling
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Solution Overview
Problem
Current toolholders for cryogenic machining with internal jet cooling face challenges in achieving high-efficiency thermal insulation and dynamic sealing, leading to structural deformation, assembly failures, and reduced machining accuracy due to ultra-low temperatures and narrow spaces within the toolholder.
Innovation Solution
A hollow toolholder with a high-performance thermal insulation structure and bidirectional sealing system, utilizing modified polyimide materials and ultra-low temperature-resistant seals, combined with a flange connection for reliable locking, to prevent coolant leakage and maintain dimensional precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal insulation structure is added to the toolholder for cryogenic coolant transport, then the temperature diffusion is suppressed and coolant transport stability is improved, but the device complexity increases and installation accuracy is difficult to maintain
Solution Approach 1:
The thermal insulation structure is nested within the hollow toolholder body, with the insulation layer positioned between the coolant flow passage and the outer toolholder wall. This nested configuration provides thermal insulation functionality while minimizing the overall device footprint and avoiding external additions that would increase complexity.
Solution Approach 2:
The patent employs composite material construction for the toolholder, combining materials with different thermal properties to achieve effective thermal insulation. The composite structure integrates insulating materials with the structural components, providing both mechanical strength and thermal isolation without requiring separate insulation components.
2Reliability
If sealing structures are added to prevent cryogenic coolant leakage, then sealing reliability is improved, but the device complexity increases and assembly accuracy becomes more difficult to maintain
Solution Approach 1:
The sealing structure utilizes flexible sealing elements that can deform to accommodate manufacturing tolerances and assembly variations. These flexible seals are integrated into the toolholder structure at critical interfaces, providing reliable sealing without requiring precision machining or complex sealing mechanisms.
Solution Approach 2:
The sealing function is merged with the structural components of the toolholder. Sealing surfaces and sealing elements are integrated into the existing hollow toolholder body and its interfaces with the spindle and cutting tool, eliminating the need for separate sealing assemblies and reducing overall device complexity.
3Ease of manufacture
If the toolholder structure is simplified to reduce complexity, then ease of manufacture is improved, but thermal insulation and sealing performance deteriorate under ultra-low temperature
Solution Approach 1:
The toolholder structure implements local quality optimization by providing thermal insulation and sealing enhancements only at critical locations where temperature gradients and leakage risks exist. The majority of the toolholder body maintains a simple hollow structure for ease of manufacture, while strategic insulation and sealing features are added at the coolant flow passages and interface regions.
4Ease of manufacture
If the toolholder structure is simplified to reduce complexity, then ease of manufacture is improved, but sealing capability under ultra-low temperature deteriorates
Solution Approach 1:
The toolholder structure implements local quality optimization by providing thermal insulation and sealing enhancements only at critical locations where temperature gradients and leakage risks exist. The majority of the toolholder body maintains a simple hollow structure for ease of manufacture, while strategic insulation and sealing features are added at the coolant flow passages and interface regions.
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 solution effectively suppresses cryogenic temperature diffusion, ensures stable coolant transport, and maintains assembly accuracy, providing a reliable and efficient means for internal jet cooling in cryogenic machining.
Implementation Method 1
a high-performance thermal insulation structure... to suppress the diffusion of the cryogenic temperature field to the toolholder and spindle
Implementation Method 2
a bidirectional sealing structure... to prevent the leakage of cryogenic medium towards the spindle and the cutting tool
Data Source
AI summary
A toolholder matched with the internal jet cooling spindle for cryogenic coolant is mainly composed of a hollow toolholder body, a high-performance thermal insulation structure and a bidirectional sealing structure. They can guide the cryogenic coolant from the spindle to the internal cooling channel of cutting tool and realize the cryogenic thermal insulation and dynamic sealing. The high-performance thermal insulation structure inside the toolholder employs the material with a low thermal conductivity and a low linear expansion coefficient to restrain the low temperature impact of cryogenic coolant on the toolholder and spindle, to ensure the dimensional accuracy and assembly accuracy of the toolholder. The bidirectional sealing structure in the toolholder uses the ultra-low temperature resistant seal rings to prevent the cryogenic coolant from leaking towards the spindle and the cutting tool, to ensure the stability of the coolant transport.