Cutting Tool Heat Exchanger for Closed-Loop Insert Cooling
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Solution Overview
Problem
High temperatures during machining processes, especially when dealing with high-alloy chips, lead to increased wear and diffusion issues in cutting tools, and existing cooling methods are either expensive or environmentally hazardous.
Innovation Solution
A closed coolant circuit with a refrigerant and heat exchanger system that efficiently transfers heat away from the cutting element, using a heat-conducting element to maintain tool holder stability and reduce coolant loss, allowing for controlled temperature regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional external cooling fluids are used, then cooling effect is achieved, but coolant loss and environmental pollution increase
Solution Approach 1:
The patent introduces a refrigerant as an intermediary substance that circulates through a closed-loop cooling system. The refrigerant absorbs heat from the cutting element via evaporation in the evaporator and releases it in the condenser, replacing traditional open-loop cooling fluids. This intermediary approach enables effective cooling while eliminating coolant loss and environmental pollution through the closed circulation system.
Solution Approach 2:
The patent utilizes phase transitions of the refrigerant (evaporation and condensation) as the core cooling mechanism. The refrigerant evaporates in the evaporator to absorb heat from the cutting element, then condenses in the condenser to release the absorbed heat. This phase transition-based cooling is more efficient and environmentally friendly compared to traditional cooling fluids, as it operates in a closed loop without loss.
2Temperature
If cryogenic machining with liquid nitrogen or CO2 is used, then cooling effect is achieved, but workpiece hardening and equipment complexity increase
Solution Approach 1:
The patent uses a controllable refrigeration system that can precisely regulate the refrigerant temperature and cooling parameters, unlike fixed-temperature cryogenic fluids. The system includes a compressor, condenser, expansion valve, and evaporator that work together to maintain optimal cooling parameters adaptively, reducing equipment complexity while avoiding workpiece hardening.
Solution Approach 2:
The patent incorporates temperature sensors and control units that monitor the cutting element temperature and adjust the refrigeration system accordingly. This feedback mechanism ensures the cooling process remains controlled and adaptive, preventing excessive cooling that could cause workpiece hardening, while simplifying the overall system compared to uncontrolled cryogenic approaches.
3Productivity
If PCD cutting material is used, then cutting performance is improved, but carbon diffusion into steel tool increases
Solution Approach 1:
The patent converts the harmful high-temperature condition that causes carbon diffusion into a benefit by implementing active refrigeration. The system cools the cutting element to temperatures that prevent carbon diffusion from PCD into the steel tool holder, while maintaining the high cutting performance of PCD. The harmful thermal effect is transformed into a controlled parameter that enhances rather than degrades the cutting process.
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
This solution reduces coolant consumption, enables dry processing, and extends the service life of cutting tools, allowing for efficient machining of high-alloy materials at lower temperatures with reduced wear.
Implementation Method 1
By placing a heat-conducting element between the cutting element and the heat exchanger housing, it is possible to effectively transfer the heat generated in the area of the cutting element to the heat exchanger housing
Implementation Method 2
The coolant is a refrigerant, and the closed cooling circuit includes a refrigeration unit. When a refrigeration unit is in use, the refrigerant can evaporate and be discharged as vapor from the heat exchanger housing
Implementation Method 3
The heat-conducting element has a higher conductivity than the tool holder. The tool holder is preferably made of steel. The heat-conducting element is preferably made of copper, but can also be made of another highly thermally conductive material
Data Source
Figure 1
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Figure 4~5
AI summary
A machining tool (20) having a tool holder (28) and a cutting element (30) which is connected to the tool holder (28), and having a cooling device for cooling the cutting element (30). The cooling device (50) has a closed coolant circuit (56) which has a heat exchanger (52) that has a heat exchanger housing (54) to which coolant (58) is supplied and from which heated coolant (60) is discharged, the heat exchanger housing (58) being situated in a heat exchanger receptacle (62) of the tool holder (28), and a heat-conducting element (66) which extends between the cutting element (30) and the heat exchanger housing (54) being situated in the tool holder (28).