Cutting temperature test method and system using thin slice insulation thermocouple

Abstract

The application provides a cutting temperature testing method and system adopting a sheet insulation thermocouple, and the testing system comprises a workpiece, a thermocouple, a wire, a thermocouple temperature measurement acquisition card and a cutting tool, and the testing method is as follows: polishing four side surfaces of a first metal sheet and a second metal sheet of the thermocouple, and then depositing an insulation film on the four side surfaces through a film deposition method; clamping the thermocouple by using a first workpiece and a second workpiece; when the workpiece is processed, plastic deformation of the workpiece material and the metal sheet occurs, the first metal sheet and the second metal sheet are bonded together to form a temperature measurement node. The sheet insulation thermocouple is prepared by depositing the insulation film around the metal sheet, the insulation reliability of the thermocouple is improved, the two metal sheets are bonded together under the plastic deformation to form the temperature measurement node, and the grinding temperature measurement stability and sensitivity are improved.

Description

Technical Field

[0001] This invention relates to the technical field of cutting processes, and more specifically, to a method and system for testing cutting temperature using a thin-film insulated thermocouple. Background Technology

[0002] Milling and grinding are effective machining methods for removing material and occupy an important position in the field of cutting processes. During machining, the workpiece is fixed on the displacement platform of the machine tool, and the milling cutter or grinding wheel acts as the cutting tool, rotating at high speed to cut the workpiece material. The surface temperature of the workpiece can reach hundreds of degrees Celsius. Temperature is a crucial factor affecting the surface finish of the workpiece; excessively high temperatures can cause surface burns and reduce the workpiece's strength. Measuring the temperature of the machined surface is of great significance for evaluating machining quality and improving workpiece performance.

[0003] In milling or grinding processes, infrared thermal imagers or contact thermocouples are generally used to measure temperature. Infrared thermal imagers can measure area temperature over a large area, but they are easily obstructed by cutting fluid, leading to inaccurate temperature measurements. A thermocouple consists of two different metals connected by wires at the sensing junction. At different temperatures, the thermocouple forms different potential differences. Measuring this potential difference between the thermocouple poles yields the temperature value. To achieve cutting-based temperature measurement, the thermocouple wires are typically held between two workpieces, with the wires protruding from the workpieces. Under the action of a grinding wheel or milling cutter, the protruding wires are cut off, causing the workpieces to plastically deform and adhere to the wires, forming the sensing junction. Besides the sensing junction, the thermocouple wires need to be insulated from each other, typically using mica sheets to insulate the wires from the workpieces. This thermocouple clamping method can measure the temperature of the workpiece surface, but the temperature sensing junction is formed by the plastic deformation of the metal wire, which is relatively unstable. Furthermore, cutting fluid can easily seep into the gap between the thermocouple wire and the workpiece, damaging the insulation of the thermocouple measurement circuit and leading to measurement failure. Therefore, to improve the effectiveness of cutting temperature testing, it is necessary to develop a highly stable and accurate method for measuring the temperature of the workpiece surface.

[0004] Therefore, a new technical solution needs to be proposed. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a cutting temperature testing method and system using a thin-film insulated thermocouple.

[0006] According to the present invention, a method for testing cutting temperature using a thin-film insulated thermocouple is provided, the method comprising the following steps:

[0007] Step S1: Select a metal sheet thermocouple and polish the four sides of the first and second metal sheets of the thermocouple.

[0008] Step S2: An insulating film is deposited on the four sides of the first and second metal sheets by thin film deposition.

[0009] Step S3: The first and second metal sheets after coating serve as the positive and negative electrodes of the thermocouple, respectively, and are connected to the thermocouple temperature measurement and acquisition card through wires.

[0010] Step S4: Cut the workpiece into a first workpiece and a second workpiece. The first metal sheet and the second metal sheet after coating are attached in parallel. The first metal sheet and the second metal sheet of the thermocouple are clamped between the first workpiece and the second workpiece. The metal sheets are perpendicular to the workpiece processing direction and protrude from the workpiece processing surface. An insulating film insulates the first metal sheet, the second metal sheet and the workpiece.

[0011] Step S5: When machining the workpiece, the cutting tool removes the protruding thermocouple metal sheet on the upper surface of the workpiece along with the workpiece material. Under the action of the cutting tool, the workpiece material and the metal sheet undergo plastic deformation, and the first metal sheet and the second metal sheet adhere together to form a temperature measuring node. The thermocouple temperature measuring and acquisition card measures the potential difference between the metal nodes to obtain the temperature value of the workpiece machining area.

[0012] Preferably, the materials of the first and second metal sheets in step S1 conform to IEC international standards, and the graduation number and materials are: S-type platinum-rhodium-pure platinum, R-type platinum-rhodium-pure platinum, B-type platinum-rhodium-platinum, K-type nickel-chromium-nickel-silicon, T-type pure copper-copper-nickel, J-type iron-copper-nickel, N-type nickel-chromium-silicon-nickel-silicon, and E-type nickel-chromium-copper-nickel.

[0013] The thickness of the first and second metal sheets is 10μm–200μm, and the width is 1mm–5mm.

[0014] Preferably, the thin film deposition method in step S2 is chemical vapor deposition or physical vapor deposition;

[0015] The insulating film is a ceramic oxide or a metal oxide with insulating properties.

[0016] Preferably, the insulating film in step S2 is made of silicon dioxide, aluminum oxide, or titanium dioxide.

[0017] The thickness of the insulating film is 0.1 μm–1.5 μm.

[0018] Preferably, after the first workpiece and the second workpiece are bonded together in step S4, there is a cuboid region extending from the workpiece's machined surface to its bottom surface, which is used to place a thin thermocouple. The length of the rectangular penetrating region on the workpiece surface is not less than the width of the metal sheet, and the width of the rectangular penetrating region is not greater than the thickness of the first and second metal sheets after they have been bonded together.

[0019] The present invention also provides a cutting temperature testing system using a thin-film insulated thermocouple, the system comprising the following modules:

[0020] Module M1: Select a metal sheet thermocouple, and polish the four sides of the first and second metal sheets of the thermocouple.

[0021] Module M2: An insulating film is deposited on the four sides of the first and second metal sheets by thin film deposition.

[0022] Module M3: The first and second metal sheets after coating serve as the positive and negative electrodes of the thermocouple, respectively, and are connected to the thermocouple temperature measurement and acquisition card through wires.

[0023] Module M4: The workpiece is cut into a first workpiece and a second workpiece. The first metal sheet and the second metal sheet after coating are attached in parallel. The first metal sheet and the second metal sheet of the thermocouple are clamped between the first workpiece and the second workpiece. The metal sheets are perpendicular to the workpiece processing direction and protrude from the workpiece processing surface. An insulating film insulates the first metal sheet, the second metal sheet and the workpiece.

[0024] Module M5: When machining a workpiece, the cutting tool removes the protruding thermocouple metal sheet on the upper surface of the workpiece along with the workpiece material. Under the action of the cutting tool, the workpiece material and the metal sheet undergo plastic deformation, and the first metal sheet and the second metal sheet adhere together to form a temperature measuring node. The thermocouple temperature measuring and acquisition card measures the potential difference between the metal nodes to obtain the temperature value of the workpiece machining area.

[0025] Preferably, the materials of the first and second metal sheets in module M1 conform to IEC international standards, and the graduation number and materials are: S-type platinum-rhodium-pure platinum, R-type platinum-rhodium-pure platinum, B-type platinum-rhodium-platinum, K-type nickel-chromium-nickel-silicon, T-type pure copper-copper-nickel, J-type iron-copper-nickel, N-type nickel-chromium-silicon-nickel-silicon, and E-type nickel-chromium-copper-nickel.

[0026] The thickness of the first and second metal sheets is 10μm–200μm, and the width is 1mm–5mm.

[0027] Preferably, the thin film deposition method in module M2 is chemical vapor deposition or physical vapor deposition;

[0028] The insulating film is a ceramic oxide or a metal oxide with insulating properties.

[0029] Preferably, the insulating film in module M2 is made of silicon dioxide, aluminum oxide, or titanium dioxide.

[0030] The thickness of the insulating film is 0.1 μm–1.5 μm.

[0031] Preferably, after the first workpiece and the second workpiece in module M4 are bonded together, there is a cuboid region extending from the workpiece's machined surface to its bottom surface, which is used to place a thin-film thermocouple. The length of the rectangular penetrating region on the workpiece surface is not less than the width of the metal sheet, and the width of the rectangular penetrating region is not greater than the thickness of the first and second metal sheets after they have been bonded together.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The present invention deposits an insulating film around the metal sheet, which improves the reliability of the insulation between the thermocouple metal pole and the workpiece;

[0034] 2. The metal sheet of the present invention has a large width and the insulation film has a thickness of only submicron to several micrometers, which is conducive to the bonding of two metal sheets together under plastic deformation to form a temperature measuring node, thereby improving the stability of grinding temperature measurement.

[0035] 3. The metal sheet of the present invention has a small thickness, only tens to hundreds of micrometers, which improves the sensitivity of the temperature measurement response. Attached Figure Description

[0036] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0037] Figure 1 This is a schematic diagram of a cutting temperature testing system;

[0038] Figure 2 Schematic diagram of the metal poles of an insulating sheet thermocouple;

[0039] Figure 3 A top-view cross-sectional view of a workpiece clamping an insulating sheet thermocouple;

[0040] Figure 4 A three-dimensional schematic diagram of the assembly of the insulating sheet thermocouple and the workpiece;

[0041] Figure 5 This is a flowchart illustrating the principle of the present invention.

[0042] in:

[0043] Workpiece 1, First workpiece 11

[0044] Thermocouple 2, Second workpiece 12

[0045] Wire 3 First metal sheet 21

[0046] Thermocouple temperature acquisition card 4 Second metal sheet 22

[0047] Cutting tool 5, insulating film 23 Detailed Implementation

[0048] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0049] Example 1:

[0050] Reference Figure 5 According to the present invention, a cutting temperature testing method using a thin-film insulated thermocouple is provided, the method comprising the following steps:

[0051] Step S1: Select a metal sheet thermocouple and polish the four sides of the first and second metal sheets of the thermocouple. The materials of the first and second metal sheets conform to IEC international standards, and the type and material are: S-type platinum-rhodium-pure platinum, R-type platinum-rhodium-pure platinum, B-type platinum-rhodium-platinum, K-type nickel-chromium-nickel-silicon, T-type pure copper-copper-nickel, J-type iron-copper-nickel, N-type nickel-chromium-silicon-nickel-silicon, and E-type nickel-chromium-copper-nickel. The thickness of the first and second metal sheets is 10μm–200μm, and the width is 1mm–5mm.

[0052] Step S2: An insulating film is deposited on the four sides of the first and second metal sheets by thin film deposition. The thin film deposition method is chemical vapor deposition or physical vapor deposition. The insulating film is a ceramic oxide or metal oxide with insulating properties. The material of the insulating film is silicon dioxide, aluminum oxide or titanium dioxide. The thickness of the insulating film is 0.1μm–1.5μm.

[0053] Step S3: The first and second metal sheets after coating serve as the positive and negative electrodes of the thermocouple, respectively, and are connected to the thermocouple temperature measurement and acquisition card through wires.

[0054] Step S4: Cut the workpiece into a first workpiece and a second workpiece. The coated first metal sheet and the second metal sheet are bonded together in parallel. The first workpiece and the second workpiece clamp the first metal sheet and the second metal sheet of the thermocouple. The metal sheets are perpendicular to the workpiece processing direction and protrude from the workpiece processing surface. An insulating film insulates the first metal sheet, the second metal sheet and the workpiece. After the first workpiece and the second workpiece are bonded together, there is a rectangular area that runs from the workpiece processing surface to the bottom surface of the workpiece. This area is used to place the sheet thermocouple. The length of the rectangular penetrating area on the workpiece surface is not less than the width of the metal sheet, and the width of the rectangular penetrating area is not greater than the thickness of the coated first metal sheet and the second metal sheet after bonding.

[0055] Step S5: When machining the workpiece, the cutting tool removes the protruding thermocouple metal sheet on the upper surface of the workpiece along with the workpiece material. Under the action of the cutting tool, the workpiece material and the metal sheet undergo plastic deformation, and the first metal sheet and the second metal sheet adhere together to form a temperature measuring node. The thermocouple temperature measuring and acquisition card measures the potential difference between the metal nodes to obtain the temperature value of the workpiece machining area.

[0056] The present invention also provides a cutting temperature testing system using a thin-film insulated thermocouple. The cutting temperature testing system using a thin-film insulated thermocouple can be implemented by executing the process steps of the cutting temperature testing method using a thin-film insulated thermocouple. That is, those skilled in the art can understand the cutting temperature testing method using a thin-film insulated thermocouple as a preferred embodiment of the cutting temperature testing system using a thin-film insulated thermocouple.

[0057] Example 2:

[0058] The present invention also provides a cutting temperature testing system using a thin-film insulated thermocouple, the system comprising the following modules:

[0059] Module M1: A sheet metal thermocouple is selected, and the four sides of the first and second sheet metal of the thermocouple are polished. The materials of the first and second sheet metal conform to IEC international standards, and the type and material are: S-type platinum-rhodium-pure platinum, R-type platinum-rhodium-pure platinum, B-type platinum-rhodium-platinum, K-type nickel-chromium-nickel-silicon, T-type pure copper-copper-nickel, J-type iron-copper-nickel, N-type nickel-chromium-silicon-nickel-silicon, and E-type nickel-chromium-copper-nickel. The thickness of the first and second sheet metal is 10μm–200μm, and the width is 1mm–5mm.

[0060] Module M2: An insulating film is deposited on the four sides of the first and second metal sheets by thin film deposition. The thin film deposition method is chemical vapor deposition or physical vapor deposition. The insulating film is a ceramic oxide or metal oxide with insulating properties. The material of the insulating film is silicon dioxide, aluminum oxide or titanium dioxide. The thickness of the insulating film is 0.1μm–1.5μm.

[0061] Module M3: The first and second metal sheets after coating serve as the positive and negative electrodes of the thermocouple, respectively, and are connected to the thermocouple temperature measurement and acquisition card through wires.

[0062] Module M4: The workpiece is cut into a first workpiece and a second workpiece. The first metal sheet and the second metal sheet after coating are bonded together in parallel. The first workpiece and the second workpiece clamp the first metal sheet and the second metal sheet of the thermocouple. The metal sheets are perpendicular to the workpiece processing direction and protrude from the workpiece processing surface. An insulating film insulates the first metal sheet, the second metal sheet and the workpiece. After the first workpiece and the second workpiece are bonded together, there is a rectangular area that runs from the workpiece processing surface to the bottom surface of the workpiece for placing the sheet thermocouple. The length of the rectangular penetrating area on the workpiece surface is not less than the width of the metal sheet, and the width of the rectangular penetrating area is not greater than the thickness of the first metal sheet and the second metal sheet after coating are bonded together.

[0063] Module M5: When machining a workpiece, the cutting tool removes the protruding thermocouple metal sheet on the upper surface of the workpiece along with the workpiece material. Under the action of the cutting tool, the workpiece material and the metal sheet undergo plastic deformation, and the first metal sheet and the second metal sheet adhere together to form a temperature measuring node. The thermocouple temperature measuring and acquisition card measures the potential difference between the metal nodes to obtain the temperature value of the workpiece machining area.

[0064] Example 3:

[0065] This invention provides a cutting temperature testing method using a thin-film insulated thermocouple. The testing system includes a workpiece 1, a thermocouple 2, wires 3, a thermocouple temperature acquisition card 4, and a cutting tool 5. The testing method involves polishing the four sides of the first metal sheet 21 and the second metal sheet 22 of the thermocouple, followed by depositing an insulating film 23 using thin-film deposition. The thermocouple is then clamped between the first workpiece 11 and the second workpiece 12. During workpiece machining, the workpiece material and the metal sheets undergo plastic deformation, causing the first metal sheet 21 and the second metal sheet 22 to bond together, forming a temperature-sensing junction. This invention improves the insulation reliability of the thermocouple by depositing an insulating film around the metal sheets to create a thin-film insulated thermocouple. The bonding of the two metal sheets together under plastic deformation to form a temperature-sensing junction enhances the stability and sensitivity of grinding temperature measurement.

[0066] According to the present invention, a cutting temperature testing method using a thin-film insulated thermocouple is provided. The required apparatus includes: a testing system comprising a workpiece 1, a thermocouple 2, a wire 3, a thermocouple temperature acquisition card 4, and a cutting tool 5, as shown below. Figure 1 The thermocouple preparation method and cutting temperature testing method are as follows:

[0067] A K-type nickel-chromium / nickel-silicon metal sheet thermocouple is selected. The four sides of the first metal sheet 21 and the second metal sheet 22 of thermocouple 2 are polished. After polishing, the thickness of the thermocouple metal sheet is 100μm-150μm and the width is 1mm-2mm.

[0068] An insulating film 23 is deposited on the four sides of the first metal sheet 21 and the second metal sheet 22 of the thermocouple by chemical vapor deposition or physical vapor deposition, such as... Figure 2 As shown; the insulating film can be made of silicon dioxide, aluminum oxide or titanium dioxide; the thickness of the insulating film is 0.1μm–1.5μm.

[0069] The first metal sheet 21 and the second metal sheet 22 after coating serve as the positive and negative electrodes of the thermocouple, respectively, and are connected to the thermocouple temperature acquisition card 4 through the wire 3.

[0070] Workpiece 1 is cut into a first workpiece 11 and a second workpiece 12. A first metal sheet 21 and a second metal sheet 22, after coating, are attached parallel to each other. The first metal sheet 21 and the second metal sheet 22 of the thermocouple are clamped between the first workpiece 11 and the second workpiece 12. The metal sheets are perpendicular to the workpiece processing direction and protrude a certain height from the workpiece processing surface. An insulating film insulates the first metal sheet 21, the second metal sheet 22 from the workpiece. Figure 3 As shown.

[0071] When machining a workpiece, the cutting tool 5 removes the thermocouple metal sheet protruding from the upper surface of the workpiece 1 along with the workpiece material. Under the action of the cutting tool 5, the workpiece material and the metal sheet undergo plastic deformation, and the first metal sheet 21 and the second metal sheet 22 adhere together to form a temperature measuring node. The thermocouple temperature measuring and acquisition card 4 measures the potential difference between the metal nodes to obtain the temperature value of the workpiece machining area.

[0072] After the first workpiece 11 and the second workpiece 12 are bonded together, there is a rectangular region extending from the machined surface of the workpiece to the bottom surface of the workpiece, used to place the thin-film thermocouple 2. The length of the rectangular region penetrating the workpiece surface is not less than the width of the metal sheet, and the width of the rectangular region is not greater than the thickness of the first metal sheet 21 and the second metal sheet 22 after bonding. Figure 4 As shown.

[0073] The metal sheet has an insulating film deposited around its perimeter, which reduces the thickness of the thermocouple insulation layer and improves the insulation effect. At the same time, the metal sheet has a large width and the insulating film is only submicron to several micrometers thick, which is conducive to the two metal sheets bonding together under plastic deformation to form a temperature measuring node, thus improving the stability of grinding temperature measurement. The small thickness of the metal sheet also improves the temperature measurement sensitivity.

[0074] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1 and Embodiment 2.

[0075] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0076] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A method for testing cutting temperature using a thin-film insulated thermocouple, characterized in that, The method includes the following steps: Step S1: Select a metal sheet thermocouple and polish the four sides of the first and second metal sheets of the thermocouple. Step S2: An insulating film is deposited on the four sides of the first and second metal sheets by thin film deposition. Step S3: The first and second metal sheets after coating serve as the positive and negative electrodes of the thermocouple, respectively, and are connected to the thermocouple temperature measurement and acquisition card through wires. Step S4: Cut the workpiece into a first workpiece and a second workpiece. The first metal sheet and the second metal sheet after coating are attached in parallel. The first metal sheet and the second metal sheet of the thermocouple are clamped between the first workpiece and the second workpiece. The metal sheets are perpendicular to the workpiece processing direction and protrude from the workpiece processing surface. An insulating film insulates the first metal sheet, the second metal sheet and the workpiece. Step S5: When machining the workpiece, the cutting tool removes the protruding thermocouple metal sheet on the upper surface of the workpiece along with the workpiece material. Under the action of the cutting tool, the workpiece material and the metal sheet undergo plastic deformation. The first metal sheet and the second metal sheet adhere together to form a temperature measuring node. The thermocouple temperature measuring and acquisition card measures the potential difference between the metal nodes to obtain the temperature value of the workpiece machining area. The thickness of the first and second metal sheets is 10μm–200μm, and the width is 1mm–5mm; The thickness of the insulating film is 0.1 μm–1.5 μm.

2. The cutting temperature testing method using a thin-film insulated thermocouple according to claim 1, characterized in that, The materials of the first and second metal sheets in step S1 conform to IEC international standards, and the graduation numbers and materials are: S-type platinum-rhodium-pure platinum, R-type platinum-rhodium-pure platinum, B-type platinum-rhodium-platinum, K-type nickel-chromium-nickel-silicon, T-type pure copper-copper-nickel, J-type iron-copper-nickel, N-type nickel-chromium-silicon-nickel-silicon, and E-type nickel-chromium-copper-nickel.

3. The cutting temperature testing method using a thin-film insulated thermocouple according to claim 1, characterized in that, The thin film deposition method in step S2 is either chemical vapor deposition or physical vapor deposition; The insulating film is a ceramic oxide or metal oxide with insulating properties.

4. The cutting temperature testing method using a thin-film insulated thermocouple according to claim 1, characterized in that, The insulating film in step S2 is made of silicon dioxide, aluminum oxide, or titanium dioxide.

5. The cutting temperature testing method using a thin-film insulated thermocouple according to claim 1, characterized in that, In step S4, after the first workpiece and the second workpiece are bonded together, there is a rectangular region extending from the workpiece's machined surface to its bottom surface, which is used to place a thin thermocouple. The length of the rectangular region extending through the workpiece surface is not less than the width of the metal sheet, and the width of the rectangular region is not greater than the thickness of the first and second metal sheets after they are bonded together.

6. A cutting temperature testing system employing a thin-film insulated thermocouple, characterized in that, The system includes the following modules: Module M1: Select a metal sheet thermocouple, and polish the four sides of the first and second metal sheets of the thermocouple. Module M2: An insulating film is deposited on the four sides of the first and second metal sheets by thin film deposition. Module M3: The first and second metal sheets after coating serve as the positive and negative electrodes of the thermocouple, respectively, and are connected to the thermocouple temperature measurement and acquisition card through wires. Module M4: The workpiece is cut into a first workpiece and a second workpiece. The first metal sheet and the second metal sheet after coating are attached in parallel. The first metal sheet and the second metal sheet of the thermocouple are clamped between the first workpiece and the second workpiece. The metal sheets are perpendicular to the workpiece processing direction and protrude from the workpiece processing surface. An insulating film insulates the first metal sheet, the second metal sheet and the workpiece. Module M5: When machining a workpiece, the cutting tool removes the protruding thermocouple metal sheet on the upper surface of the workpiece along with the workpiece material. Under the action of the cutting tool, the workpiece material and the metal sheet undergo plastic deformation. The first metal sheet and the second metal sheet adhere together to form a temperature measuring node. The thermocouple temperature measuring and acquisition card measures the potential difference between the metal nodes to obtain the temperature value of the workpiece machining area. The thickness of the first and second metal sheets is 10μm–200μm, and the width is 1mm–5mm; The thickness of the insulating film is 0.1 μm–1.5 μm.

7. The cutting temperature testing system using a thin-film insulated thermocouple according to claim 6, characterized in that, The materials of the first and second metal sheets in module M1 conform to IEC international standards, and the graduation numbers and materials are: S-type platinum-rhodium-pure platinum, R-type platinum-rhodium-pure platinum, B-type platinum-rhodium-platinum, K-type nickel-chromium-nickel-silicon, T-type pure copper-copper-nickel, J-type iron-copper-nickel, N-type nickel-chromium-silicon-nickel-silicon, and E-type nickel-chromium-copper-nickel.

8. The cutting temperature testing system using a thin-film insulated thermocouple according to claim 6, characterized in that, The thin film deposition method in module M2 is either chemical vapor deposition or physical vapor deposition; The insulating film is a ceramic oxide or metal oxide with insulating properties.

9. The cutting temperature testing system using a thin-film insulated thermocouple according to claim 6, characterized in that, The insulating film in module M2 is made of silicon dioxide, aluminum oxide, or titanium dioxide.

10. The cutting temperature testing system using a thin-film insulated thermocouple according to claim 6, characterized in that, After the first workpiece and the second workpiece in module M4 are bonded together, there is a rectangular region extending from the workpiece's machined surface to its bottom surface, which is used to place a thin thermocouple. The length of the rectangular region extending through the workpiece surface is not less than the width of the thin metal sheet, and the width of the rectangular region is not greater than the thickness of the first and second thin metal sheets after they are bonded together.

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