Ceramic Cutting Tool With Integrated Thermoelectric Temperature Sensing
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Solution Overview
Problem
Existing cutting temperature measurement methods, such as contact and non-contact thermocouples, suffer from inaccuracies and damage to tools, and thin-film thermocouples have bonding issues, making precise temperature measurement during milling and cutting challenging.
Innovation Solution
A ceramic tool with integrated temperature sensing and cutting functions, comprising a ceramic matrix and positive and negative thermoelectric layers, converts cutting temperature into a thermoelectric electromotive force for real-time measurement, using materials like Al2O3, Si3N4, CBN, Mo, Ni, Co, W, Cr, TiC, WC, SiC, MgO, Cr2O3, TiO2, ZrO2, ZrB2, and SiC, with a structure that enhances mechanical properties and bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact temperature measurement methods are used, then temperature can be measured, but the measurement accuracy is significantly affected by surrounding environment and cannot accurately measure the absolute temperature of the cutting area
Solution Approach 1:
The patent combines the temperature sensing function with the cutting tool body by integrating a thermocouple directly into the tool structure. The thermocouple's positive and negative electrode wires are embedded within the tool body, with their junction positioned at the cutting edge where temperature measurement is most critical. This integration eliminates the need for external temperature sensors and their associated wiring, thereby removing the harmful effect of surrounding environment interference on measurement accuracy.
Solution Approach 2:
The patent introduces a thermal conductor as an intermediary between the cutting edge and the thermocouple junction. This thermal conductor is positioned at the cutting edge to efficiently conduct heat from the cutting zone to the thermocouple junction, ensuring accurate temperature measurement while isolating the measurement system from environmental interference. The thermal conductor acts as a mediator that transfers thermal energy while blocking the path of environmental interference.
2Measurement precision
If wired thermocouple temperature measurement is used, then temperature can be measured, but it will damage the tool strength
Solution Approach 1:
The patent merges the thermocouple wires with the tool body structure by embedding them during the tool manufacturing process. The positive and negative electrode wires are integrated into the tool body's internal structure, becoming an inherent part of the tool rather than external attachments. This integration eliminates the need for separate wire routing that would compromise tool strength, as the wires are positioned and secured within the tool's structural framework during manufacturing.
Solution Approach 2:
The patent applies local quality by concentrating the thermocouple wires and their junction at the specific location where temperature measurement is most critical - the cutting edge. The wires are embedded only in the regions where they are needed for measurement, while the rest of the tool body maintains its full structural integrity. This localized integration minimizes the impact on overall tool strength while achieving accurate temperature measurement at the critical zone.
3Measurement precision
If hot contact temperature measurement is used, then temperature can be measured, but the thermoelectric potential response lags and makes it difficult to measure the temperature that changes too fast
Solution Approach 1:
The patent introduces a thermal conductor as an intermediary that actively facilitates heat transfer from the cutting edge to the thermocouple junction. This thermal conductor is positioned to create a direct thermal pathway, eliminating the need for hot contact between separate measurement components. The thermal conductor's high thermal conductivity ensures that temperature changes at the cutting edge are rapidly transmitted to the thermocouple junction, achieving fast response without the lag associated with hot contact methods.
Solution Approach 2:
The patent implements preliminary action by pre-positioning the thermocouple junction and thermal conductor in optimal locations during tool manufacturing. The junction is placed at the precise location where temperature measurement is most critical, and the thermal conductor is pre-configured to provide the most efficient heat transfer path. This preliminary positioning ensures that when cutting begins, the temperature measurement system is already optimized for rapid response, eliminating the need for adjustment or adaptation during operation.
4Measurement precision
If thin-film thermocouples are used, then temperature measurement can be achieved, but the bonding strength between the thin film and the quartz is insufficient at high temperatures, causing them to fall off and have poor linearity
Solution Approach 1:
The patent employs composite materials by combining the thermocouple wires with a thermal conductor and embedding them in the tool body structure. This composite construction provides mechanical support and thermal coupling while maintaining measurement accuracy. The thermal conductor material is selected to have high thermal conductivity and stability at cutting temperatures, ensuring both reliable bonding and accurate temperature transmission without the falling-off problems of thin-film thermocouples.
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 ceramic tool provides accurate, real-time cutting temperature measurement without additional sensors, maintaining tool integrity and improving machining quality and efficiency with high hardness, flexural strength, and fracture toughness.
Implementation Method 1
the ceramic tool has a thermoelectric effect by setting a positive thermoelectric layer and negative thermoelectric layer with different thermoelectric materials on both sides of the ceramic substrate respectively, wherein when using the gradient ceramic tool with the thermoelectric effect to cut a part material, it can convert the temperature signal into the thermoelectric electromotive force signal
Implementation Method 2
the ceramic matrix being formed by sintering a first matrix material, a first binding agent and a first reinforcing phase, and the positive thermoelectric layer and the negative thermoelectric layer are formed by sintering of a thermoelectric material
Data Source
AI summary
A ceramic tool with integrated temperature sensing and cutting functions and preparation method and application thereof. The ceramic tool comprises a ceramic matrix, a positive thermoelectric layer and a negative thermoelectric layer being provided on two surfaces of the ceramic matrix; the ceramic matrix being formed by sintering a first matrix material, a first binding agent and a first reinforcing phase, and the thermoelectric layer being formed by sintering of a thermoelectric material; the first matrix material comprises one or more of Al2O3, Si3N4 and CBN; the first binding agent comprises one or more of Mo, Ni, Co, W and Cr; the first reinforcing phase comprises one or more of TiC, WC, SiC, MgO, Cr2O3, TiO2 and ZrO2; the thermoelectric material for the positive thermoelectric layer comprises ZrB2 and SiC; the thermoelectric material for the negative thermoelectric layer comprises ZrB2, SiC, and graphite.