A grinding temperature measurement system, measurement method and manufacturing method for a super high strength steel based on a thermal phase change

Abstract

The application discloses a grinding temperature measurement system, a measurement method and a manufacturing method of the grinding temperature measurement system based on thermal phase change of super high strength steel, and belongs to the technical field of grinding temperature measurement. The grinding temperature measurement system comprises an alloy wire with a surface-deposited V2O5 coating and a test piece. The test piece is prepared from super high strength steel. A plurality of fixed light holes are arranged on a grinding area to be measured of the test piece. The fixed light holes are internally and fixedly provided with the alloy wire with the surface-deposited V2O5 coating. The super high strength steel, the V2O5 coating and the alloy wire constitute a temperature measurement couple head. The high-temperature end of the temperature measurement couple head is arranged close to the grinding area to be measured. The low-temperature end is connected with a temperature measurement circuit. The application can more accurately and conveniently measure the grinding temperature and has good practicability.

Description

Technical Field

[0001] This invention belongs to the technical field of grinding temperature measurement, specifically relating to a grinding temperature measurement system, measurement method and manufacturing method for ultra-high strength steel based on thermally induced phase transformation. Background Technology

[0002] Grinding temperature is the instantaneous high temperature generated in the contact area between the grinding wheel and the workpiece due to high-speed friction and the elastic-plastic deformation of the workpiece. Grinding temperature is influenced by multiple factors, including the linear velocity of the grinding wheel, the thermal conductivity of the workpiece material, and the adjustment of grinding parameters, and can range from 400 to 1500℃. However, excessively high grinding temperatures can easily cause grinding thermal damage to the workpiece surface, such as grinding burns, thermal deformation, residual stress, and cracks, reducing the dimensional accuracy and fatigue strength of the workpiece. Therefore, effectively controlling the grinding temperature is a key technical challenge in solving grinding thermal damage, and measuring the grinding temperature is a necessary prerequisite for controlling it. Specifically, ultra-high strength steel, which has a strength exceeding 1.5 GPa, generates more grinding heat during grinding than ordinary steel. Measuring the grinding temperature of ultra-high strength steel is of significant engineering value for controlling its grinding thermal damage.

[0003] Currently, the main methods for measuring grinding temperature include: (1) Thermocouple method: This method utilizes the principle that when two materials of different composition are close together and a potential difference is formed between their contact interfaces when heated, the grinding temperature is measured. However, since the grinding wheel is non-conductive, manual or semi-manual thermocouple method is usually used to measure the grinding temperature. Due to limitations in insulation and the distance between the measurement points and the grinding zone, manual or semi-manual thermocouple method cannot perform multiple consecutive measurements in a single setup.

[0004] (2) Radiation method, which uses the principle of light and heat radiation to measure grinding temperature. For example, the grinding temperature is measured by infrared radiation pyrometer, infrared photography, and infrared thermal imager. However, due to the influence of grinding fluid, these radiation methods will produce large errors when measuring grinding temperature, resulting in very low accuracy.

[0005] (3) Metallographic structure method: This method uses changes in the metallographic structure of the workpiece surface after grinding to determine the grinding temperature. However, this method involves a large amount of observation and analysis work and has limited application scope. It is only applicable to situations where obvious changes in the microstructure of metallic materials can be observed at high temperatures. Secondly, the metallographic structure method involves offline observation and estimation of grinding temperature, and this method cannot be used for temperature measurement during the grinding process.

[0006] (4) Microhardness analysis method, which uses the principle that the workpiece exhibits different hardness at different temperatures to make inverse temperature inference. However, this method is greatly affected by the initial structure, hardness and residual stress of the material, and is not universally applicable.

[0007] (5) Coloring method: Fine metal powder that can melt at a certain temperature is coated on the cross-section of the specimen. The specimen is then put together and ground. After grinding, the specimen is separated and the grinding temperature is determined by observing the melting area of ​​the fine powder. However, this method has low accuracy in measuring grinding temperature.

[0008] In summary, current methods for measuring grinding temperature each have their own advantages and disadvantages, as well as different applicable ranges. In practical applications, none of them can simultaneously meet the following requirements: (1) After installation at a specific location, continuously and accurately measure the grinding temperature; (2) Accurately measure the grinding temperature under the condition of having grinding fluid; (3) Accurately measure the temperature distribution in the processing area. Summary of the Invention

[0009] The purpose of this invention is to provide a grinding temperature measurement system, measurement method and manufacturing method for ultra-high strength steel based on thermally induced phase transformation, in order to solve the above-mentioned problems.

[0010] This invention is mainly achieved through the following technical solutions: A grinding temperature measurement system for ultra-high strength steel based on thermally induced phase change includes an alloy wire with a V2O5 coating deposited on its surface and a test piece. The test piece is made of ultra-high strength steel. The grinding area to be tested on the test piece is provided with several fixed optical holes. An alloy wire with a V2O5 coating is fixedly installed inside the fixed optical holes. The ultra-high strength steel, the V2O5 coating, and the alloy wire constitute a temperature measuring head. The high-temperature end of the temperature measuring head is located close to the grinding area to be tested, and the low-temperature end is connected to a temperature measuring circuit.

[0011] To better realize the present invention, the thickness of the V2O5 coating is further 2~5μm.

[0012] To better realize the present invention, the alloy wire is further described as Cu-Ni alloy wire, Ni-Cr alloy wire or Ni-Si alloy wire, and the diameter of the alloy wire is less than or equal to 2 mm.

[0013] To better realize the present invention, further, when the V2O5 coating has not undergone phase change, the resistance of the thermocouple head is >1MΩ, and when the V2O5 coating undergoes phase change, the resistance of the thermocouple head is <50Ω.

[0014] This invention is mainly achieved through the following technical solutions: A method for manufacturing a grinding temperature measurement system for ultra-high strength steel based on thermally induced phase transformation, as described above, includes the following steps in preparing the temperature sensing head: Step S1: First, deposit a V2O5 coating on the surface of the alloy wire; A V2O5 coating is deposited on the surface of the alloy wire using vapor deposition or magnetron sputtering. Then, annealing is performed to make the metallic phase transition temperature of the V2O5 coating greater than or equal to 260℃ and the phase transition response time less than or equal to 1ms. Step S2: Then, the deposited alloy wire is fixed in the fixed aperture of the grinding area to be tested to form a temperature measuring head.

[0015] To better realize the present invention, in step S2, the fixed optical aperture is pre-treated to make the connection interface of the fixed optical aperture clean and free of contaminants.

[0016] This invention is mainly achieved through the following technical solutions: A method for measuring the grinding temperature of ultra-high strength steel based on thermo-induced phase change is provided. This method utilizes the aforementioned system for measuring the grinding temperature of ultra-high strength steel based on thermo-induced phase change. Several deposited alloy wires are placed inside the ultra-high strength steel in the grinding area to be measured, forming several thermocouple heads to measure the grinding temperature of the ultra-high strength steel under different grinding parameters and to measure the grinding temperature distribution in the grinding area. When the grinding temperature of the ultra-high strength steel grinding area is greater than or equal to the phase change temperature of the V2O5 coating, the V2O5 coating changes from an insulating state to a metallic state, forming a closed-loop temperature measurement circuit. The thermocouple heads then transform into thermocouples, enabling real-time measurement of the grinding temperature.

[0017] To better realize the present invention, it is further applied to measuring the grinding temperature of surface grinding, cylindrical grinding, internal hole grinding or profile grinding.

[0018] The beneficial effects of this invention are as follows: (1) The present invention uses an alloy wire coated with V2O5 and ultra-high strength steel to form a temperature measuring head, which is formed in the high-temperature grinding area to be measured at a grinding temperature of above 260°C. When the grinding temperature is higher than the phase transition temperature of the V2O5 coating, the V2O5 coating in the temperature measuring head part of the grinding area changes from an insulating state to a metallic state. At this time, a closed temperature measuring circuit is formed. In the production or test site, the present invention can measure the grinding temperature more accurately and conveniently, and has good practicality.

[0019] (2) The Seebeck coefficient of the temperature measuring head of the present invention is not affected by the environment, and the accuracy of the calibrated temperature measuring head can reach within ±2℃. Tests have shown that after the phase change, the temperature measuring head in the high-temperature grinding area can measure the temperature of the grinding area normally with or without grinding fluid, and the temperature measurement accuracy can reach within ±2℃. Secondly, the temperature measuring head can be arranged at multiple points, and after one installation, it can continuously and accurately measure the grinding at that position. Moreover, changing the position of the cloth wire can measure the grinding temperature distribution in the processing area. Attached Figure Description

[0020] Figure 1 Temperature-resistance curves of thermocouples with V2O5 coatings of different thicknesses; Figure 2 This is a schematic diagram of the grinding temperature measurement system for ultra-high strength steel used in Example 2 to measure the grinding temperature of a surface. Figure 3 This is a schematic diagram of the grinding temperature measurement system for ultra-high strength steel used in Example 3 to measure the grinding temperature of the outer cylindrical surface. Figure 4 This is a schematic diagram of the grinding temperature measurement system for ultra-high strength steel used in Example 4 to measure the grinding temperature of the inner hole surface.

[0021] Wherein: 1-test piece, 2-V2O5 coating, 3-alloy wire, 4-external wire, 5-insulating board, 6-connecting rod, 7-retaining ring.

[0022] Figure 2 (a) is a schematic diagram of the installation structure of the thermocouple head inside the ultra-high strength steel in Example 2; Figure 2 (b) is a schematic diagram of the structure of the ultra-high strength steel grinding plane in Example 2; Figure 3 (a) is a schematic diagram of the installation structure of the thermocouple head inside the ultra-high strength steel in Example 3; Figure 3 (b) is a schematic diagram of the connection structure between the ultra-high strength steel grinding outer cylindrical surface and the temperature measuring head in Example 3; Figure 4 (a) is a schematic diagram of the installation structure of the thermocouple head inside the ultra-high strength steel in Example 4; Figure 4 (b) is a schematic diagram of the connection structure between the ultra-high strength steel grinding inner hole surface and the temperature measuring head in Example 4. Detailed Implementation

[0023] Example 1: A grinding temperature measurement system for ultra-high strength steel based on thermally induced phase change includes an alloy wire 3 with a V2O5 coating 2 deposited on its surface and a specimen 1, wherein the specimen 1 is made of ultra-high strength steel; the grinding area to be tested of the specimen 1 is provided with a plurality of fixed optical holes, and the alloy wire 3 with the V2O5 coating 2 deposited on its surface is fixedly disposed inside the fixed optical holes, and the ultra-high strength steel, the V2O5 coating 2 and the alloy wire 3 constitute a temperature measuring head.

[0024] Preferably, the diameter of the alloy wire 3 is no more than 2 mm, and it is a Cu-Ni alloy, Ni-Cr alloy, or Ni-Si alloy wire 3.

[0025] Preferably, an alloy wire 3 containing a V2O5 coating 2 can be inserted at any position on the grinding specimen 1, and the grinding temperature in the measurement area can be measured at multiple points by placing the wire.

[0026] Preferably, such as Figures 2-4 As shown, this invention is applicable to grinding temperature measurement in surface grinding, cylindrical grinding, internal grinding, and profile grinding. Specifically, an alloy wire 3 coated with V2O5 coating 2 and ultra-high strength steel are used to form a temperature measuring head, which is formed in the grinding area to be measured.

[0027] Specifically, this invention uses an alloy wire 3 coated with a V₂O₅ coating 2 and ultra-high-strength steel to form a thermocouple head. The thermocouple head forms a thermocouple after being connected in the high-temperature grinding region (above 260°C). When the grinding temperature is higher than the phase transition temperature of the V₂O₅ coating 2, the V₂O₅ coating 2 in the grinding region of the thermocouple head changes from an insulating state to a metallic state, forming a closed temperature measurement circuit. The end of the thermocouple head in the grinding region is the high-temperature end, and the room-temperature end of the alloy wire 3 and ultra-high-strength steel is the low-temperature end. After the thermocouple head is constructed from high-strength steel, V₂O₅ coating 2, and alloy wire 3, the Seebeck coefficient of the thermocouple head is calibrated to obtain the relationship between temperature (Seebeck curve).

[0028] Specifically, the preparation of the thermocouple head includes the following steps: Step S1: First, deposit a V2O5 coating 2 on the outside of the alloy wire 3; Step S2: Then, the deposited alloy wire 3 is fixed inside the ultra-high strength steel in the grinding area to be tested to form a temperature measuring head. The high-temperature end of the temperature measuring head is placed close to the grinding area to be tested, and the low-temperature end is connected to the temperature measuring circuit through an external wire 4. Specifically, the ultra-high strength steel needs to be insulated at the connection point when connected to the machine tool, and the ultra-high strength steel and the alloy wire 3 containing the V2O5 coating 2 are connected to the temperature measuring circuit at room temperature.

[0029] Preferably, in step S2, a fixed optical hole is set on the ultra-high strength steel corresponding to the alloy wire 3 by electrolysis or other methods. The surface of the fixed optical hole has no processing modification layer, and the connection interface between the fixed optical hole and the alloy wire 3 containing V2O5 coating 2 is clean and free of contaminants.

[0030] When the grinding temperature of the ultra-high strength steel grinding surface is greater than or equal to the phase transformation temperature of the V2O5 coating 2, the V2O5 coating 2 changes from an insulating state to a metallic state, forming a temperature measurement closed loop, and the temperature measuring head is transformed into a thermocouple to realize real-time measurement of grinding temperature.

[0031] Preferably, step S1 employs a vapor deposition method to deposit a dense V₂O₅ coating 2 with a thickness of 2-5 μm on the surface of the cleaned alloy wire 3. Then, annealing is performed to ensure that the V₂O₅ metallic phase transition temperature is not lower than 260°C and the phase transition response time is less than 1 ms. The thermocouple is a device formed by the alloy wire 3 containing the V₂O₅ coating 2 in close contact with ultra-high strength steel. In the untransformed state of V₂O₅, the resistance of the thermocouple is >1 MΩ; in the transformed state of V₂O₅, the resistance is <50 Ω.

[0032] like Figure 1 As shown, before the phase transition of V₂O₅ coating 2, the resistance of the thermocouple head is lowest when the thickness of V₂O₅ coating 2 is 1.3 μm, reflecting that the insulation effect decreases when the thickness of V₂O₅ coating 2 is less than 2 μm. When the thickness of V₂O₅ coating 2 is 6.2 μm, the resistance of the thermocouple head increases after the phase transition, reflecting that the conductivity of V₂O₅ coating 2 decreases. Comparative analysis shows that when the thickness of V₂O₅ coating 2 is between 2-5 μm, the resistance value of the thermocouple head decreases with increasing temperature, indicating that V₂O₅ coating 2 has successfully completed the transition from semiconductor phase to metallic phase.

[0033] Example 2: A grinding temperature measurement system for ultra-high strength steel based on thermally induced phase transformation, such as... Figure 2 As shown, this method is used for measuring the surface grinding temperature of A100 ultra-high strength steel with a tensile strength of 1.9 GPa. Specifically, the preparation of the temperature sensing head includes the following steps: Step S1: First, a V2O5 coating 2 is deposited on the outer side of the alloy wire 3; a dense V2O5 coating 2 of 2.5 μm is deposited on the surface of the Ni-Cr alloy wire 3 with a diameter of 0.5 mm using magnetron sputtering. The Ni-Cr alloy wire 3 containing the V2O5 coating 2 is heated to 550℃ in an argon-protected furnace, held at that temperature for 20 min, and then annealed. The phase transition temperature of the crystalline V2O5 coating 2 obtained after annealing is 263℃. The above preparation yields the Ni-Cr alloy wire 3 with the deposited V2O5 coating 2.

[0034] Step S2: Then, the deposited alloy wire 3 is fixed inside the ultra-high strength steel of the grinding area to be tested to form a temperature measuring head. The high-temperature end of the temperature measuring head is set close to the grinding area to be tested, and the low-temperature end is connected to the temperature measuring circuit.

[0035] like Figure 2 (a) and Figure 2 As shown in (b), insulating plates 5 are respectively set on both sides of the specimen 1, and the specimen 1 is made of ultra-high strength steel. Using electrolytic machining, a fixed aperture with a diameter of 0.5 mm is machined at the corresponding position of the ultra-high strength steel. The Ni-Cr alloy wire 3 with deposited V2O5 coating 2 is clamped between the ground specimen 1. During clamping, the Ni-Cr alloy wire 3 with deposited V2O5 coating 2 is slightly raised above the surface of the ground specimen 1, while ensuring that the Ni-Cr alloy wire 3 with deposited V2O5 coating 2 is in close contact with the A100 ultra-high strength steel.

[0036] When the grinding temperature of the ultra-high strength steel grinding surface is greater than or equal to the phase transformation temperature of the V2O5 coating 2, the V2O5 coating 2 changes from an insulating state to a metallic state, forming a temperature measurement closed loop, and the temperature measuring head is transformed into a thermocouple to realize real-time measurement of grinding temperature.

[0037] Preferably, such as Figure 2 As shown in (b), three Ni-Cr alloy wires 3 with a V2O5 coating 2 are embedded in a row on specimen 1. The connection between the low-temperature end of the alloy wire 3 and the temperature measuring circuit is insulated and kept at room temperature. By clamping multiple Ni-Cr alloy wires 3 with a V2O5 coating 2 at a time, the temperature measuring system can continuously measure the grinding temperature of A100 ultra-high strength steel surface under different grinding parameters when the grinding amount is changed. The surface grinding temperature can be measured both in dry grinding and with grinding fluid. Furthermore, changing the wire placement allows for the measurement of the grinding temperature distribution in the processing area.

[0038] This invention obtains the Seebeck coefficient of a thermocouple head as a function of temperature through calibration. Specifically, a standard thermocouple is used to calibrate the Seebeck coefficients of the Ni-Cr alloy wire 3 with a deposited V2O5 coating 2 and the A100 ultra-high strength steel, obtaining Seebeck curves for the two materials. After calibration, the temperature measurement accuracy of the thermocouple head is <±2℃. At room temperature, the V2O5 coating 2 does not undergo a phase change; therefore, the V2O5 coating 2 is non-conductive, and the thermocouple head has no thermoelectric potential output.

[0039] Example 3: A grinding temperature measurement system for ultra-high strength steel based on thermally induced phase transformation, such as... Figure 3 As shown, this method is used for measuring the external cylindrical grinding temperature of A100 ultra-high strength steel with a tensile strength of 1.9 GPa. Specifically, the preparation of the temperature sensing head includes the following steps: Step S1: First, deposit a V2O5 coating 2 on the outside of the alloy wire 3; A dense V2O5 coating 2 with a diameter of 1 mm was deposited on the surface of a Ni-Si alloy wire 3 by magnetron sputtering. Then, the wire was heated to 550 °C in an argon-protected furnace, held for 30 min, and then annealed. After annealing, the phase transition temperature of the crystalline V2O5 coating 2 was 264 °C, thus preparing the Ni-Si alloy wire 3 with deposited V2O5 coating 2.

[0040] Step S2: Then, the deposited alloy wire 3 is fixed inside the ultra-high strength steel of the grinding area to be tested to form a temperature measuring head. The high-temperature end of the temperature measuring head is set close to the grinding area to be tested, and the low-temperature end is connected to the temperature measuring circuit.

[0041] like Figure 3 (a) and Figure 3 As shown in (b), a connecting rod 6 is provided in the middle of the specimen 1, and several Ni-Si alloy wires 3 with deposited V2O5 coating 2 are provided between the connecting rod 6 and the specimen 1. The outer circular surface of the specimen 1 is a ground surface, and the specimen 1 is made of ultra-high strength steel.

[0042] Electrolytic machining was used to machine fixed apertures with a diameter of 1 mm at the corresponding positions on the ultra-high strength steel. The Ni-Si alloy wire 3 with a deposited V2O5 coating 2 was then clamped between adjacent grinding specimens 1. During clamping, the Ni-Si alloy wire 3 with the deposited V2O5 coating 2 was positioned slightly higher than the outer surface of the grinding specimen 1, while ensuring close contact between the Ni-Si alloy wire 3 with the deposited V2O5 coating 2 and the A100 ultra-high strength steel.

[0043] When the grinding temperature of the ultra-high strength steel grinding surface is greater than or equal to the phase transformation temperature of the V2O5 coating 2, the V2O5 coating 2 changes from an insulating state to a metallic state, forming a temperature measurement closed loop, and the temperature measuring head is transformed into a thermocouple to realize real-time measurement of grinding temperature.

[0044] Preferably, such as Figure 3 As shown in (b), four Ni-Si alloy wires 3 with a deposited V2O5 coating 2 are implanted around one ring of specimen 1. The connection between the alloy wires 3 and the temperature measuring circuit is insulated and kept at room temperature. By clamping multiple Ni-Si alloy wires 3 with a deposited V2O5 coating 2 at a time, the temperature measuring system can continuously measure the grinding temperature of the outer diameter of A100 ultra-high strength steel under different grinding parameters when the grinding amount is changed. The grinding temperature of the outer diameter can be measured under both dry grinding and grinding fluid conditions. Furthermore, changing the wire position can measure the grinding temperature distribution in the processing area.

[0045] This invention obtains the Seebeck coefficient of the thermocouple head as a function of temperature through calibration. Specifically, using a standard thermocouple, the Seebeck coefficients of the Ni-Si alloy wire 3 with the deposited V2O5 coating 2 and the A100 ultra-high strength steel are calibrated, obtaining the Seebeck curves for the Ni-Si alloy wire 3 with the deposited V2O5 coating 2 and the A100 ultra-high strength steel. After calibration, the temperature measurement accuracy of the thermocouple head is <±1.8℃. At room temperature, the V2O5 coating 2 does not undergo a phase change; therefore, the V2O5 coating 2 is non-conductive, and the thermocouple head has no thermoelectric potential output.

[0046] Example 4: A grinding temperature measurement system for ultra-high strength steel based on thermally induced phase transformation, such as... Figure 4 As shown, this method is used for measuring the grinding temperature of internal holes in A100 ultra-high strength steel with a tensile strength of 1.9 GPa. Specifically, the preparation of the temperature sensing head includes the following steps: Step S1: First, deposit a V2O5 coating 2 on the outside of the alloy wire 3; A dense V₂O₅ coating 2 of 4 μm was deposited on the surface of a Cu-Ni alloy wire 3 with a diameter of 1.5 mm using magnetron sputtering. Then, the wire was heated to 550 °C in an argon-protected furnace, held at that temperature for 30 min, and then annealed. After annealing, the phase transition temperature of the obtained crystalline V₂O₅ coating 2 was 264.5 °C, thus preparing the Cu-Ni alloy wire 3 with deposited V₂O₅ coating 2.

[0047] Step S2: Then, the deposited alloy wire 3 is fixed inside the ultra-high strength steel of the grinding area to be tested to form a temperature measuring head. The high-temperature end of the temperature measuring head is set close to the grinding area to be tested, and the low-temperature end is connected to the temperature measuring circuit.

[0048] like Figure 4 (a) and Figure 4 As shown in (b), retaining rings 7 are provided on both sides of the specimen 1, and the inner hole surface of the specimen 1 is a ground surface. The specimen 1 is made of ultra-high strength steel.

[0049] Using electrical discharge machining (EDM), fixed apertures with a diameter of 1.5 mm were machined at the corresponding positions on the ultra-high strength steel. The fixed apertures were then polished to remove the surface alteration layer. A Cu-Ni alloy wire 3 with a deposited V2O5 coating 2 was clamped between adjacent grinding specimens 1. During clamping, the Cu-Ni alloy wire 3 with the deposited V2O5 coating 2 was positioned slightly higher than the inner hole surface of the grinding specimen 1, while ensuring close contact between the Cu-Ni alloy wire 3 with the deposited V2O5 coating 2 and the A100 ultra-high strength steel.

[0050] When the grinding temperature of the ultra-high strength steel grinding surface is greater than or equal to the phase transformation temperature of the V2O5 coating 2, the V2O5 coating 2 changes from an insulating state to a metallic state, forming a temperature measurement closed loop, and the temperature measuring head is transformed into a thermocouple to realize real-time measurement of grinding temperature.

[0051] Preferably, such as Figure 4 As shown in (b), four Cu-Ni alloy wires 3 with a deposited V2O5 coating 2 are inserted around the inner hole of specimen 1. The connection between the alloy wires 3 and the temperature measuring circuit is insulated and kept at room temperature. By clamping multiple Cu-Ni alloy wires 3 with a deposited V2O5 coating 2 at a time, the temperature measuring system can continuously measure the grinding temperature of the outer diameter of A100 ultra-high strength steel under different grinding parameters when the grinding parameters are changed. Furthermore, changing the wire placement position can measure the grinding temperature distribution in the processing area.

[0052] This invention obtains the Seebeck coefficient of the thermocouple head as a function of temperature through calibration. Specifically, using a standard thermocouple, the Seebeck coefficients of the Cu-Ni alloy wire 3 with the deposited V2O5 coating 2 and the A100 ultra-high strength steel are calibrated, obtaining the Seebeck curves for the Cu-Ni alloy wire 3 with the deposited V2O5 coating 2 and the A100 ultra-high strength steel. After calibration, the temperature measurement accuracy of the thermocouple head is <±2℃. At room temperature, the V2O5 coating 2 does not undergo a phase change; therefore, the V2O5 coating 2 is non-conductive, and the thermocouple head has no thermoelectric potential output.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A grinding temperature measurement system for ultra-high strength steel based on thermally induced phase transformation, characterized in that, The test specimen includes an alloy wire with a V2O5 coating deposited on its surface and a test piece made of ultra-high strength steel. The test specimen has several fixed optical holes in the grinding area to be tested. The alloy wire with a V2O5 coating deposited on its surface is fixedly installed inside the fixed optical holes. The ultra-high strength steel, the V2O5 coating, and the alloy wire constitute a temperature measuring head. The high-temperature end of the temperature measuring head is located close to the grinding area to be tested, and the low-temperature end is connected to the temperature measuring circuit. The thickness of the V2O5 coating is 2~5μm; When the V2O5 coating has not undergone a phase change, the resistance of the thermocouple is >1MΩ; when the V2O5 coating undergoes a phase change, the resistance of the thermocouple is <50Ω.

2. The grinding temperature measurement system for ultra-high strength steel based on thermally induced phase transformation according to claim 1, characterized in that, The alloy wire is a Cu-Ni alloy wire, a Ni-Cr alloy wire, or a Ni-Si alloy wire, and the diameter of the alloy wire is less than or equal to 2 mm.

3. A method for manufacturing a grinding temperature measurement system for ultra-high strength steel based on thermally induced phase transformation as described in claim 1 or 2, characterized in that, The preparation of a thermocouple head includes the following steps: Step S1: First, deposit a V2O5 coating on the surface of the alloy wire; A V2O5 coating is deposited on the surface of the alloy wire using vapor deposition or magnetron sputtering. Then, annealing is performed to make the metallic phase transition temperature of the V2O5 coating greater than or equal to 260℃ and the phase transition response time less than or equal to 1ms. Step S2: Then, the deposited alloy wire is fixed in the fixed aperture of the grinding area to be tested to form a temperature measuring head.

4. The manufacturing method of a grinding temperature measurement system for ultra-high strength steel based on thermally induced phase transformation according to claim 3, characterized in that, In step S1, the alloy wire with the deposited V2O5 coating is heated to 500~600℃ in an inert gas atmosphere, held at that temperature for 20~30 minutes, and then annealed.

5. The manufacturing method of a grinding temperature measurement system for ultra-high strength steel based on thermally induced phase transformation according to claim 3, characterized in that, In step S2, the fixed optical aperture is pretreated to ensure that the connection interface of the fixed optical aperture is clean and free of contaminants.

6. A method for measuring the grinding temperature of ultra-high strength steel based on thermally induced phase transformation, wherein the method is based on the grinding temperature measurement system for ultra-high strength steel based on thermally induced phase transformation as described in claim 1 or 2, characterized in that... Several deposited alloy wires are installed inside the ultra-high strength steel in the grinding area to be tested, forming several thermocouple heads to measure the grinding temperature of the ultra-high strength steel under different grinding conditions and to measure the grinding temperature distribution in the grinding area. When the grinding temperature of the ultra-high strength steel grinding area is greater than or equal to the phase transition temperature of the V2O5 coating, the V2O5 coating changes from an insulating state to a metallic state, forming a closed temperature measurement loop. The thermocouple head then transforms into a thermocouple, enabling real-time measurement of the grinding temperature.

7. The grinding temperature measurement method for ultra-high strength steel based on thermally induced phase transformation according to claim 6, characterized in that, It is used to measure the grinding temperature in surface grinding, cylindrical grinding, internal grinding, or profile grinding.

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