A milling temperature measuring tool and preparation method thereof

Abstract

The present invention discloses a milling temperature measuring tool and a preparation method thereof, belonging to the technical field of cutting tool preparation. A milling temperature measuring tool comprises a tool cutting body and an annular temperature measuring module embedded in the tool cutting body, wherein the annular temperature measuring module is a thermosensitive ceramic, and the inner diameter of the annular temperature measuring module is 6 to 8 mm, the outer diameter is 10 to 12 mm, and the height is 3 to 5 mm. Compared with traditional milling tools, the milling temperature measuring tool of the present invention has a wide temperature measurement range and high sensitivity to temperature changes, and overcomes the problem that the preparation process of the thin film thermocouple sensor temperature measuring tool is complicated and difficult to mass produce.

Description

Technical Field

[0001] The invention belongs to the technical field of cutting tool preparation, and in particular relates to a milling temperature measuring tool and a preparation method thereof. Background Art

[0002] With the development of intelligent manufacturing, a series of manufacturing industries such as aerospace, medical equipment, and automobile manufacturing are transforming towards precision, integration, and intelligence. As a direct participant in cutting, cutting tools can no longer be limited to excellent cutting performance, but should be developed into perceptual tools that can monitor the cutting status, and combine sensors, hardware and software facilities, industrial Internet, big data, artificial intelligence and other technologies to predict the tool status, thereby achieving real-time control of the cutting process, rapid optimization, or real-time adjustment of cutting parameters and other functions.

[0003] Tool wear is inevitable in cutting processing, but the tool wear value cannot be directly observed during the cutting process. Therefore, the tool wear state is generally inferred from the tool cutting state. In the context of intelligent manufacturing, the tool cutting state can be transmitted to the tool state monitoring system through sensors, and then the data is uploaded to the big data cloud storage system. The tool wear state can be predicted by analyzing a large amount of data, and the cutting parameters suitable for the current processing can be given. At present, the monitoring of tool state is mainly in the four aspects of cutting force, cutting vibration, cutting noise and cutting temperature. Thanks to the development of sensor technology, the monitoring technology of cutting force, cutting vibration and cutting noise has been relatively complete, but the monitoring of cutting temperature still has many weaknesses.

[0004] Infrared cameras are generally used in industry to measure cutting temperature, but this technology has the following problems: first, it is expensive; second, it can only detect surface temperature. Once the temperature measurement point is blocked, the temperature measurement cannot be completed. The detection process is also easily disturbed by chips. Finally, its temperature measurement accuracy is seriously reduced in a coolant environment.

[0005] At present, the most accurate and effective method for temperature measurement is to embed a thin film thermocouple near the cutting edge of the tool. The paper (Cutting tools embedded with thin film thermocouples vertically to the rakeface for temperature measurement [J]. Sensors and Actuators A: Physical, 2019, 296: 392-399.) uses an intelligent temperature measurement tool made with embedded thin film thermocouples to achieve a response speed of sub-microseconds. However, this method has a complex manufacturing process and high production cost. It is only suitable for measuring cutting temperature in experimental research and cannot be mass-produced for industrial manufacturing. Patent CN104942318A provides an intelligent transient cutting temperature measurement tool. It develops an intelligent temperature measurement tool that uses a thin film thermocouple plated on the tool body. It can accurately and real-time measure the transient temperature of the cutting area. However, the thin film thermocouple plated by this method cannot withstand the impact of chips for a long time, resulting in premature wear of the thin film thermocouple before the tool fails.

[0006] Therefore, there is an urgent need in the art for a milling temperature measuring knife with simple preparation process, high measurement sensitivity and strong wear resistance. Summary of the invention

[0007] The purpose of the present invention is to provide a milling temperature measuring tool and a preparation method thereof to solve the problems existing in the prior art. The milling temperature measuring tool prepared by the present invention through the adjustment of raw materials and preparation methods has high temperature measurement sensitivity; the preparation process of the present invention is simple and efficient, and can be mass-produced. The milling temperature measuring tool of the present invention can effectively measure temperature without affecting the strength of the tool, which is helpful to promote the development and application of intelligent cutting technology, and is of great significance to the high-quality preparation of complex precision parts and heat-sensitive components in the fields of aviation and aerospace.

[0008] The present invention provides the following solutions:

[0009] A milling temperature measuring tool comprises a tool cutting body and an annular temperature measuring module embedded in the tool cutting body. The annular temperature measuring module is a thermistor ceramic. The inner diameter of the annular temperature measuring module is 6 to 8 mm, the outer diameter is 10 to 12 mm, and the height is 3 to 5 mm. The length of the tool cutting body is 20 to 35 mm, and the diameter is 10 to 12 mm.

[0010] When the thermistor ceramic powder of the annular temperature measuring module is sintered together with the tool cutting body powder, the height and thickness of the thermistor ceramic powder will affect the thermal expansion pressure of the thermistor ceramic during sintering, thereby forming different pressure differences with the thermal expansion pressure of the cutting part of the tool body. Different pressure differences will affect the amount of metal elements in the tool body penetrating into the thermistor ceramic, thereby causing the resistance of the thermistor ceramic to decrease to varying degrees, changing the temperature measurement sensitivity of the thermistor ceramic. Therefore, the present invention limits the inner diameter of the annular temperature measuring module to 6-8mm, the outer diameter to 10-12mm, and the height to 3-5mm.

[0011] Furthermore, the material of the tool cutting body is selected from one of metal ceramics and cemented carbide; the thermosensitive ceramic is 0.5LaCrO 3 -0.5Y 2 O 3 .

[0012] In LaCrO 3 Y 2 O 3 It can amplify the resistance value of thermistor ceramics that changes with temperature, thereby increasing the sensitivity of thermistor ceramics; LaCrO 3 and Y 2 O 3 The molar ratio of LaCrO will affect the temperature measurement range. Compared with other molar ratios, 3 and Y 2 O 3 When the molar ratio is equimolar, the temperature measurement range is the widest.

[0013] The metal ceramic is prepared from metal ceramic original powder, the cemented carbide is prepared from cemented carbide original powder, and the thermosensitive ceramic is prepared from thermosensitive ceramic original powder.

[0014] The present invention provides a method for preparing a milling temperature measuring tool, comprising the following steps:

[0015] (1) The raw material powder of the tool cutting body is loaded into a mold provided with a circular ring, the mold being a detachable mold, and the circular ring is pulled out after applying axial pressure to form a circular ring-shaped tunnel, the raw material powder of the temperature measuring module is filled in the circular ring-shaped tunnel, and the raw material powder of the tool cutting body is filled again, and the axial pressure is applied again to obtain a milling temperature measuring tool blank;

[0016] (2) Sintering the milling temperature measuring tool blank in a nitrogen atmosphere, applying axial pressure during the sintering process, and obtaining the milling temperature measuring tool.

[0017] Furthermore, the axial pressure in step (1) is 5-10MPa, and the holding time is 2min; the axial pressure applied again is 10MPa, and the holding time is 2min; the nitrogen atmosphere sintering pressure in step (2) is 0.05MPa; the axial pressure is 40MPa; the sintering temperature is 1450℃~1550℃, and the holding time is 5min.

[0018] The milling temperature measuring tool needs to meet the main function of cutting, so the cutting performance and tool strength of the tool body need to be guaranteed. The reason why the above parameters are selected in step 2 is that under the above parameters, the tool body has the optimal mechanical properties.

[0019] Furthermore, the raw material powder of the tool cutting body in step (1) is selected from one of metal ceramic raw powder and cemented carbide raw powder; and the raw material powder of the temperature measuring module is thermistor ceramic raw powder.

[0020] The method for preparing the original metal ceramic powder comprises: adding the powder raw material to anhydrous ethanol (the mass ratio of the powder raw material to the anhydrous ethanol is 1:3), ultrasonicating for 2 hours, vacuum drying at 120° C. for 6 hours, grinding after cooling, and passing through a 100-mesh sieve to obtain the original metal ceramic powder; the powder raw material comprises: Ti(C, N) 70%, Mo 2 C 10%, WC 5%, VC 3% and high entropy alloy powder (HEA) 12%; in terms of mass percentage, the HEA includes Fe 19.9%, Co 21%, Ni 21%, Cr 18.5% and Mn 19.6%.

[0021] The above-mentioned metal ceramic original powder is the original powder of the Ti(C,N) (titanium carbonitride) metal ceramic tool body. It has the advantages of high red hardness, good wear resistance, excellent cutting performance, etc. In addition, it has strong thermal conductivity, so it can quickly conduct the cutting heat near the cutting edge to the thermistor ceramic temperature measurement module, thereby improving the temperature measurement accuracy.

[0022] The method for preparing the cemented carbide original powder comprises: adding the powder raw material into anhydrous ethanol (the mass ratio of the powder raw material to the anhydrous ethanol is 1:3), ultrasonicating for 2 hours, vacuum drying at 120° C. for 6 hours, grinding after cooling, and passing through a 100-mesh sieve to obtain the cemented carbide original powder; in terms of mass percentage, the powder raw material comprises: WC 92% and Co 8%.

[0023] The above-mentioned cemented carbide original powder is the original powder of the WC (tungsten carbide) metal ceramic tool body. It has the advantages of good red hardness, strong wear resistance, high hardness, good toughness, excellent cutting performance, etc. In addition, it has strong thermal conductivity, so it can quickly conduct the cutting heat near the cutting edge to the thermistor ceramic temperature measurement module, thereby improving the temperature measurement accuracy.

[0024] The method for preparing the thermosensitive ceramic raw powder comprises: mixing an equal molar amount of LaCrO 3 and Y 2 O 3 The powder was added into anhydrous ethanol (LaCrO 3 and Y 2 O 3 The mass ratio of powder to anhydrous ethanol was 1:3), ball milled for 6 h, vacuum dried at 120° C. for 6 h, and passed through a 100-mesh sieve to obtain the original thermosensitive ceramic powder.

[0025] The above-mentioned thermistor ceramic raw powder is LaCrO 3 -Y 2 O 3 Negative temperature coefficient thermistor ceramics (lanthanum chromate thermistor ceramics), used to prepare temperature measurement modules, equimolar ratio of LaCrO 3 -Y 2 O 3 It can make the thermistor ceramic obtain a suitable temperature measurement range and a higher temperature measurement sensitivity. 2 O 3 Adding Y will increase the room temperature resistance of thermistor ceramics, increase the starting temperature of thermistor ceramics, and thus reduce the temperature measurement range of thermistor ceramics; too little Y 2 O 3 Adding will reduce the overall resistance of the thermistor ceramic, and the resistance will not change significantly with temperature, which reduces the temperature measurement sensitivity.

[0026] Beneficial effects of the present invention:

[0027] (1) Compared with the conventional milling cutter, the present invention not only has the cutting function, but also has the cutting temperature measurement function.

[0028] (2) The present invention adopts the thermosensitive ceramic 0.5LaCrO 3 -0.5Y 2 O 3 As an annular temperature measurement module, the annular thermistor temperature sensing module is embedded in the middle of the tool body. The temperature changes during the cutting process are sensed by thermistors, and measurements can be made within the range of 50 to 900°C, with a measurement sensitivity of up to 14194K.

[0029] (3) The field is in urgent need of a milling temperature measuring knife with simple preparation process, high measurement sensitivity and strong wear resistance. The temperature measurement sensitivity of thermistor ceramics is highly sensitive compared with other temperature measurement methods (thin film thermocouples). The present invention embeds the temperature measurement module above the cutting edge of the tool, which does not participate in cutting and will not cause wear to the temperature measurement module during the cutting process.

[0030] (4) The tool cutting body and the annular temperature measuring module of the present invention can be formed under one sintering condition, and the preparation process is simple and efficient.

[0031] (5) The milling temperature measuring tool of the present invention has a compact structure and can be mass-produced through conventional technology, with low manufacturing cost and easy promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 The two-dimensional structure diagram of the milling temperature measuring tool prepared in Example 1, wherein 1 is an annular temperature measuring module and 2 is a tool cutting body;

[0034] Figure 2 This is a three-dimensional image of the milling temperature measuring tool prepared in Example 1, where 1 is the annular temperature measuring module and 2 is the tool cutting body. DETAILED DESCRIPTION

[0035] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0036] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0037] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0038] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present application description and examples are exemplary only.

[0039] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0040] The embodiment of the present invention provides a milling temperature measuring tool, comprising a tool cutting body and an annular temperature measuring module embedded in the tool cutting body, wherein the annular temperature measuring module is a thermosensitive ceramic 0.5LaCrO 3 -0.5Y 2 O 3 The inner diameter of the annular temperature measurement module is 6-8 mm, the outer diameter is 10-12 mm, and the height is 3-5 mm; the length of the tool cutting body is 20-35 mm, and the diameter is 10-12 mm.

[0041] Furthermore, the material of the tool cutting body is selected from one of metal ceramics and cemented carbide; the thermosensitive ceramic is 0.5LaCrO 3 -0.5Y 2 O 3 The metal ceramic is prepared from the original metal ceramic powder, the cemented carbide is prepared from the original cemented carbide powder, and the thermosensitive ceramic is prepared from the original thermosensitive ceramic powder.

[0042] The present invention provides a method for preparing a milling temperature measuring tool, comprising the following steps:

[0043] (1) The raw material powder of the tool cutting body is loaded into a mold provided with a circular ring, the mold being a detachable mold, and the circular ring is pulled out after applying axial pressure to form a circular ring-shaped tunnel, the raw material powder of the temperature measuring module is filled in the circular ring-shaped tunnel, and the raw material powder of the tool cutting body is filled again, and the axial pressure is applied again to obtain a milling temperature measuring tool blank;

[0044] (2) Sintering the milling temperature measuring tool blank in a nitrogen atmosphere, applying axial pressure during the sintering process, and obtaining the milling temperature measuring tool.

[0045] Furthermore, the axial pressure in step (1) is 5-10MPa, and the holding time is 2min; the axial pressure applied again is 10MPa, and the holding time is 2min; the nitrogen atmosphere sintering pressure in step (2) is 0.05MPa; the axial pressure is 40MPa; the sintering temperature is 1450℃~1550℃, and the holding time is 5min.

[0046] Furthermore, the raw material powder of the tool cutting body in step (1) is selected from one of metal ceramic raw powder and cemented carbide raw powder; and the raw material powder of the temperature measuring module is thermistor ceramic raw powder.

[0047] The method for preparing the raw metal ceramic powder includes: adding the raw metal ceramic powder to anhydrous ethanol (the mass ratio of the raw metal ceramic powder to the anhydrous ethanol is 1:3), ultrasonicating for 2 hours, vacuum drying at 120°C for 6 hours, grinding after cooling, and passing through a 100-mesh sieve to obtain the raw metal ceramic powder. The raw metal ceramic powder includes: Ti(C,N) 70%, Mo 2 C 10%, WC 5%, VC 3% and HEA 12%; in terms of mass percentage, the HEA includes Fe 19.9%, Co 21%, Ni 21%, Cr 18.5% and Mn 19.6%.

[0048] The method for preparing the thermosensitive ceramic raw powder comprises: mixing an equal molar amount of LaCrO 3 and Y 2 O 3 The powder was added into anhydrous ethanol (LaCrO 3 and Y 2 O 3 The mass ratio of powder to anhydrous ethanol was 1:3), ball milled for 6 h, vacuum dried at 120° C. for 6 h, and passed through a 100-mesh sieve to obtain the original thermosensitive ceramic powder.

[0049] Example 1

[0050] A method for preparing a milling temperature measuring tool

[0051] (1) Preparation of metal ceramic raw powder

[0052] By mass percentage, the powder raw materials are: Ti(C,N) 70%, Mo 2 C 10%, WC 5%, VC 3% and HEA 12%. By mass percentage, the raw materials of HEA are: Fe 19.9%, Co 21%, Ni 21%, Cr 18.5% and Mn 19.6%.

[0053] The above-mentioned powder raw materials and anhydrous ethanol are mixed in a beaker at a mass ratio of 1:3, and the beaker is placed in an ultrasonic oscillator. Mechanical stirring is performed at 50 r / min, and ultrasonic oscillation is performed for 2 hours to obtain a slurry. The slurry is vacuum dried at 120° C. for 6 hours. The dried powder is cooled and passed through a 100-mesh sieve to obtain a metal ceramic original powder.

[0054] (2) Preparation of thermosensitive ceramic raw powder

[0055] LaCrO 3 and Y2 O 3 The powders were mixed in a molar ratio of 0.5:0.5 to obtain a mixed powder, the mixed powder and anhydrous ethanol were mixed in a mass ratio of 1:3, and the mixture was milled in a planetary ball mill with alumina balls for 6 hours with a ball-to-material ratio of 8:1 to obtain a slurry; the slurry was then vacuum dried at 120°C for 6 hours, the dried powder was cooled, and passed through a 100-mesh sieve to obtain a thermosensitive ceramic original powder.

[0056] (3) Preparation of milling temperature measuring tool blank

[0057] The inner wall of a graphite mold with an inner diameter of 12.6 mm and a height of 60 mm is covered with graphite paper, and the metal ceramic original powder is filled into the graphite mold to a height of 30 mm. Then, a ring is placed and the metal ceramic powder is compacted, and an axial pressure of 10 MPa is applied and maintained for 2 minutes. The ring is taken out, and the thermosensitive ceramic original powder is filled into the tunnel formed by the ring to a height of 8 mm. Then, the metal ceramic original powder is filled again to a height of 60 mm, and an axial pressure of 5 MPa is applied again. The pressure is maintained for 2 minutes to obtain a milling temperature measuring tool blank.

[0058] (4) Preparation of milling temperature measuring tools

[0059] A. Wrap the graphite mold containing the milling temperature measuring tool blank with carbon felt and put it into a spark plasma sintering furnace. Wash the furnace chamber twice with a 0.05MPa nitrogen atmosphere. After each washing, evacuate to 10Pa and fill with nitrogen again to a pressure of 0.05MPa. Apply an axial pressure of 40MPa to the mold pressure head and sinter at 1500℃ for 5min. After the insulation, release the pressure immediately and cool naturally with the furnace to obtain the milling temperature measuring tool rod.

[0060] B. Grind out the cutting edge at one end of the milling temperature measuring tool rod, connect the wires to the two ends of the diameter of the annular temperature measuring module through silver electrodes, and then connect the wires to the current detection sensor. Use a wireless transmitter to send the changing current signal to the computer terminal software, and obtain the changing cutting temperature value by comparing the resistance-temperature characteristic curve of the thermistor ceramic.

[0061] Figure 1 The two-dimensional structure diagram of the milling temperature measuring tool prepared in Example 1, wherein 1 is an annular temperature measuring module and 2 is a tool cutting body; Figure 2 This is a three-dimensional image of the milling temperature measuring tool prepared in Example 1, where 1 is the annular temperature measuring module and 2 is the tool cutting body.

[0062] The milling temperature measuring tool prepared in this embodiment has a tool length of 30 mm, a tool body diameter of 12 mm, an annular temperature measuring module with an outer diameter of 12 mm, an inner diameter of 8 mm, and a height of 5 mm.

[0063] The relative density of the milling temperature measuring tool was determined by the Archimedes drainage method, and the Vickers hardness (HV 20 ), use Vickers hardness indentation to expand cracks to calculate fracture toughness and use the three-point bending method to measure bending strength; use the temperature resistance characteristic curve measured by a digital multimeter to calculate the temperature measurement range and sensitivity of the milling temperature measuring tool. The measurement sensitivity refers to the range of change in the resistance of thermistor ceramics caused by unit temperature, expressed in B (unit K). The larger the B, the higher the temperature measurement sensitivity.

[0064] The relative density of the cutting body of the milling temperature measuring tool prepared in this embodiment is 100%, and the Vickers hardness (HV 20 ) reaches 19.51±0.21GPa, and the toughness reaches 8.18±0.12MPa·m 1 / 2 The bending strength reaches 1228.8±81.9MPa; the cutting temperature measurement range is 50~900℃, and the temperature measurement sensitivity is 14194K.

[0065] Example 2

[0066] The milling temperature measuring tool prepared in this embodiment has a tool length of 25 mm, a tool body diameter of 10 mm, an annular temperature measuring module with an outer diameter of 10 mm, an inner diameter of 8 mm, and a height of 3 mm.

[0067] The relative density of the cutting body of the milling temperature measuring tool prepared in this embodiment is 100%, and the Vickers hardness (HV 20 ) reaches 19.32±0.14GPa, and the toughness reaches 8.04±0.31MPa·m 1 / 2 The bending strength reaches 1178.8±65.8MPa; the cutting temperature measurement range is 55~900℃, and the temperature measurement sensitivity is 14115K.

[0068] Example 3

[0069] The milling temperature measuring tool prepared in this embodiment has a tool length of 25 mm, a tool body diameter of 10 mm, an annular temperature measuring module with an outer diameter of 10 mm, an inner diameter of 6 mm, and a height of 4 mm.

[0070] The relative density of the cutting body of the milling temperature measuring tool prepared in this embodiment is 100%, and the Vickers hardness (HV 20 ) reaches 18.44±0.24GPa, and the toughness reaches 7.25±0.36MPa·m 1 / 2 The bending strength reaches 1086.7±48.6MPa; the cutting temperature measurement range is 60~900℃, and the temperature measurement sensitivity is 12245K.

[0071] Example 4

[0072] The milling temperature measuring tool prepared in this embodiment has a tool length of 30 mm, a tool body diameter of 10 mm, an annular temperature measuring module with an outer diameter of 10 mm, an inner diameter of 6 mm, and a height of 3 mm.

[0073] The relative density of the cutting body of the milling temperature measuring tool prepared in this embodiment is 100%, and the Vickers hardness (HV 20 ) reaches 18.93±0.22GPa, and the toughness reaches 8.25±0.34MPa·m 1 / 2 The bending strength reaches 1196.8±87.2MPa; the cutting temperature measurement range is 55~900℃, and the temperature measurement sensitivity is 11575K.

[0074] Example 5

[0075] The milling temperature measuring tool prepared in this embodiment has a tool length of 35 mm, a tool body diameter of 12 mm, an annular temperature measuring module with an outer diameter of 12 mm, an inner diameter of 6 mm, and a height of 5 mm.

[0076] The relative density of the cutting body of the milling temperature measuring tool prepared in this embodiment is 100%, and the Vickers hardness (HV 20 ) reaches 19.42±0.24GPa, and the toughness reaches 8.54±0.46MPa·m 1 / 2 The bending strength reaches 1136.7±67.4MPa; the cutting temperature measurement range is 60~900℃, and the temperature measurement sensitivity is 13516K.

[0077] Example 6

[0078] The milling temperature measuring tool prepared in this embodiment has a tool length of 35 mm, a tool body diameter of 12 mm, an annular temperature measuring module with an outer diameter of 12 mm, an inner diameter of 8 mm, and a height of 3 mm.

[0079] The relative density of the cutting body of the milling temperature measuring tool prepared in this embodiment is 100%, and the Vickers hardness (HV 20 ) reaches 19.36±0.35GPa, and the toughness reaches 8.24±0.18MPa·m 1 / 2 The bending strength reaches 1284.3±43.8MPa; the cutting temperature measurement range is 50~900℃, and the temperature measurement sensitivity is 13454K.

[0080] Example 7

[0081] Same as Example 1, except that in step (4), sintering is performed at 1450°C.

[0082] The milling temperature measuring tool prepared in this embodiment has a tool length of 30 mm, a tool body diameter of 12 mm, an annular temperature measuring module with an outer diameter of 12 mm, an inner diameter of 8 mm, and a height of 5 mm.

[0083] The relative density of the cutting body of the milling temperature measuring tool prepared in this embodiment is 99%, and the Vickers hardness (HV 20 ) reaches 18.75±0.38GPa, and the toughness reaches 9.16±0.94MPa·m 1 / 2 The bending strength reaches 1046.8±83.1MPa; the cutting temperature measurement range is 48~900℃, and the temperature measurement sensitivity is 14256K.

[0084] Example 8

[0085] Same as Example 1, except that in step (4), sintering is performed at 1550°C.

[0086] The milling temperature measuring tool prepared in this embodiment has a tool length of 30 mm, a tool body diameter of 12 mm, an annular temperature measuring module with an outer diameter of 12 mm, an inner diameter of 8 mm, and a height of 5 mm.

[0087] The relative density of the cutting body of the milling temperature measuring tool prepared in this embodiment is 100%, and the Vickers hardness (HV 20 ) reaches 19.07±0.38GPa, and the toughness reaches 7.30±0.44MPa·m 1 / 2 The bending strength reaches 1106.8±50.9MPa; the cutting temperature measurement range is 85~900℃, and the temperature measurement sensitivity is 13254K.

[0088] Example 9

[0089] Same as Example 1, except that the material of the cutting body of the tool used is cemented carbide.

[0090] The preparation method of cemented carbide raw powder is as follows: adding powder raw material to anhydrous ethanol (the mass ratio of powder raw material to anhydrous ethanol is 1:3), ultrasonicating for 2 hours, vacuum drying at 120°C for 6 hours, grinding after cooling, and passing through a 100-mesh sieve to obtain cemented carbide raw powder; the powder raw material includes: WC 92% and Co 8% by mass percentage.

[0091] The milling temperature measuring tool prepared in this embodiment has a tool length of 30 mm, a tool body diameter of 12 mm, an annular temperature measuring module with an outer diameter of 12 mm, an inner diameter of 8 mm, and a height of 5 mm.

[0092] The relative density of the cutting body of the milling temperature measuring tool prepared in this comparative example is 100%, and the Vickers hardness (HV 20) reaches 20.60±0.37GPa, and the toughness reaches 11.4±0.24MPa·m 1 / 2 The bending strength reaches 1842±35MPa; the cutting temperature measurement range is 56~900℃, and the temperature measurement sensitivity is 13586K.

[0093] Comparative Example 1

[0094] The same as Example 1, except that in step (4), no gas washing operation is performed, the pressure is evacuated to 10 MPa, and sintering is performed in a vacuum environment.

[0095] The milling temperature measuring tool prepared in this embodiment has a tool length of 30 mm, a tool body diameter of 12 mm, an annular temperature measuring module with an outer diameter of 12 mm, an inner diameter of 8 mm, and a height of 5 mm.

[0096] The relative density of the cutting body of the milling temperature measuring tool prepared in this comparative example is 99%, and the Vickers hardness (HV 20 ) reaches 18.53±0.77GPa, and the toughness reaches 7.19±0.82MPa·m 1 / 2 , the bending strength reaches 1126.8±71.1MPa; the cutting temperature measurement range is 100-900℃, and the temperature measurement sensitivity is 13417K.

[0097] Compared with Example 1, due to sintering in a vacuum environment, the cutting tool main body material Ti (C, N) undergoes a denitrification reaction, thereby generating tiny pores in the tool body, reducing the relative density and comprehensive mechanical properties of the tool body material. In addition, the denitrification reaction will also intensify the diffusion of nitrogen into the thermistor ceramic, thereby occupying the space of oxygen vacancies, hindering the thermal excitation transition of electrons, causing the room temperature resistance of the thermistor ceramic to rise, increasing the starting temperature measurement temperature of the thermistor ceramic, and reducing the temperature measurement range of the thermistor ceramic.

[0098] Comparative Example 2 (Adjusting the thickness of the annular temperature measurement module to be smaller than that of Example 1)

[0099] The milling temperature measuring tool prepared in this comparative example has a tool length of 30 mm, a tool body diameter of 12 mm, an annular temperature measuring module with an outer diameter of 12 mm, an inner diameter of 10 mm, and a height of 5 mm.

[0100] The relative density of the cutting body of the milling temperature measuring tool prepared in this comparative example is 100%, and the Vickers hardness (HV 20 ) reaches 19.12±0.34GPa, and the toughness reaches 8.42±0.22MPa·m 1 / 2 The bending strength reaches 1251.6±71.5MPa; the cutting temperature measurement range is 200-900℃, and the temperature measurement sensitivity is 10132K.

[0101] In this comparative example, the amount of thermistor ceramic original powder added is adjusted to obtain an annular temperature measuring module with a thickness smaller than that of Example 1. Since the thickness of the annular temperature measuring module is reduced, the thermal expansion pressure generated by it is reduced, and the metal elements in the tool body material Ti (C, N) can more easily penetrate into the thermistor ceramic, causing the overall resistance of the thermistor ceramic to decrease, thereby reducing the temperature measurement sensitivity and narrowing the temperature measurement range.

[0102] Comparative Example 3 (Adjusting the thickness of the annular temperature measurement module to be greater than that of Example 1)

[0103] The milling temperature measuring tool prepared in this comparative example has a tool length of 30 mm, a tool body diameter of 12 mm, an annular temperature measuring module with an outer diameter of 12 mm, an inner diameter of 4 mm, and a height of 5 mm.

[0104] The relative density of the cutting body of the milling temperature measuring tool prepared in this comparative example is 100%, and the Vickers hardness (HV 20 ) reaches 18.76±0.34GPa, and the toughness reaches 7.15±0.27MPa·m 1 / 2 The bending strength reaches 876.5±46.7MPa; the cutting temperature measurement range is 100-900℃, and the temperature measurement sensitivity is 15879K.

[0105] In this comparative example, the amount of thermistor ceramic original powder added is adjusted to obtain an annular temperature measuring module with a thickness greater than that of Example 1. As the thickness of the annular temperature measuring module increases, the thermal expansion pressure of the thermistor ceramic increases, which hinders the penetration of metal elements in the tool main body material Ti (C, N) into the thermistor ceramic. The resistance of the thermistor ceramic is greater than that of Example 1, so the temperature measurement sensitivity is higher than that of Example 1. However, if the thickness of the annular temperature measuring module is too thick, the overall strength of the tool will be reduced.

[0106] Comparative Example 4 (Adjusting the height of the annular temperature measurement module to be smaller than that of Example 1)

[0107] The milling temperature measuring tool prepared in this comparative example has a tool length of 30 mm, a tool body diameter of 12 mm, an annular temperature measuring module with an outer diameter of 12 mm, an inner diameter of 8 mm, and a height of 2 mm.

[0108] The relative density of the milling temperature measuring tool prepared in this comparative example is 100%, and the Vickers hardness (HV 20 ) reached 19.61±0.37GPa, and the toughness reached 8.26±0.14MPa·m 1 / 2 The bending strength reaches 1240.6±91.3MPa, the cutting temperature measurement range is 100~900℃, and the temperature measurement sensitivity is 11254K.

[0109] In this comparative example, the amount of thermistor ceramic original powder added is adjusted to obtain an annular temperature measuring module with a smaller height than that of Example 1. Since the height of the annular temperature measuring module is reduced, the longitudinal thermal expansion pressure generated by it is reduced, and the metal elements in the tool body material Ti (C, N) can more easily penetrate into the thermistor ceramic, causing the overall resistance of the thermistor ceramic to decrease, thereby reducing the temperature measurement sensitivity and narrowing the temperature measurement range.

[0110] Comparative Example 5 (Adjusting the height of the annular temperature measurement module to be greater than that of Example 1)

[0111] The milling temperature measuring tool prepared in this comparative example has a tool length of 30 mm, a tool body diameter of 12 mm, an annular temperature measuring module with an outer diameter of 12 mm, an inner diameter of 8 mm, and a height of 6 mm.

[0112] The relative density of the milling temperature measuring tool prepared in this comparative example is 97%, and the Vickers hardness (HV 20 ) reaches 17.67±0.41GPa, and the toughness reaches 7.96±0.15MPa·m 1 / 2 The bending strength reaches 1064.8±53.7MPa, the cutting temperature measurement range is 60~900℃, and the temperature measurement sensitivity is 14986K.

[0113] In this comparative example, an annular temperature measuring module with a height greater than that of Example 1 is obtained by adjusting the amount of thermistor ceramic original powder added. As the height of the annular temperature measuring module increases, the longitudinal thermal expansion pressure of the thermistor ceramic increases, which hinders the penetration of metal elements in the tool main body material Ti (C, N) into the thermistor ceramic. The resistance of the thermistor ceramic is greater than that of Example 1, so the temperature measurement sensitivity is higher than that of Example 1. However, if the height of the annular temperature measuring module is too high, the overall strength of the tool will be reduced.

[0114] Comparative Example 6

[0115] Same as Example 1, except that in step (2) LaCrO 3 and Y 2 O 3 The powders were mixed in a molar ratio of 0.4:0.6.

[0116] The milling temperature measuring tool prepared in this comparative example has a tool length of 30 mm, a tool body diameter of 12 mm, an annular temperature measuring module with an outer diameter of 12 mm, an inner diameter of 8 mm, and a height of 5 mm.

[0117] The relative density of the milling temperature measuring tool prepared in this comparative example is 100%, and the Vickers hardness (HV 20 ) reaches 19.67±0.43GPa, and the toughness reaches 8.06±0.35MPa·m 1 / 2The bending strength reaches 1214.6±35.4MPa, the cutting temperature measurement range is 260~900℃, and the temperature measurement sensitivity is 16241K.

[0118] Since this comparative ratio increases Y 2 O 3 The addition of 20% increases the overall resistance of the thermistor ceramic, reduces the overall conductivity of the thermistor ceramic, and improves the temperature measurement sensitivity, but also increases the starting temperature at which its resistance changes linearly with temperature, reducing the temperature measurement range.

[0119] Comparative Example 7

[0120] Same as Example 1, except that in step (2) LaCrO 3 and Y 2 O 3 The powders were mixed in a molar ratio of 0.6:0.4.

[0121] The milling temperature measuring tool prepared in this comparative example has a tool length of 30 mm, a tool body diameter of 12 mm, an annular temperature measuring module with an outer diameter of 12 mm, an inner diameter of 8 mm, and a height of 5 mm.

[0122] The relative density of the milling temperature measuring tool prepared in this comparative example is 100%, and the Vickers hardness (HV 20 ) reached 18.94±0.31GPa, and the toughness reached 8.23±0.22MPa·m 1 / 2 The bending strength reaches 1198.8±78.6MPa, the cutting temperature measurement range is 40~760℃, and the temperature measurement sensitivity is 10547K.

[0123] Since this comparative ratio reduces Y 2 O 3 The addition amount reduces the overall resistance of the thermistor ceramic, increases the overall conductivity of the thermistor ceramic, reduces the starting temperature and upper limit temperature of the linear change of its resistance with temperature, and reduces the temperature measurement sensitivity.

[0124] Comparative Example 8

[0125] The same as Example 1, except that no thermosensitive ceramic original powder is prepared, and no thermosensitive ceramic original powder is added during the preparation of the milling temperature measuring tool blank.

[0126] The relative density of the milling temperature measuring tool prepared in this comparative example is 100%, and the Vickers hardness (HV 20 ) reaches 19.82±0.53GPa, and the toughness reaches 8.13±0.87MPa·m 1 / 2The bending strength reaches 1281.8±96.8MPa. Since no thermosensitive ceramic original powder is added, the tool can only be used for cutting and does not have the cutting temperature measurement function.

[0127] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A milling temperature measuring tool, characterized in that: It includes a tool cutting body and an annular temperature measuring module embedded in the tool cutting body, the annular temperature measuring module is a thermistor ceramic, the inner diameter of the annular temperature measuring module is 6-8mm, the outer diameter is 10-12mm, and the height is 3-5mm; the length of the tool cutting body is 20-35mm, and the diameter is 10-12mm; The material of the tool cutting body is selected from one of metal ceramics and cemented carbide, and the thermosensitive ceramic is 0.5LaCrO3-0.5Y2O3.

2. A method for preparing a milling temperature measuring tool according to claim 1, characterized in that: The following steps are involved: (1) The raw material powder of the tool cutting body is loaded into a mold provided with a circular ring, the mold being a detachable mold, and the circular ring is pulled out after applying axial pressure to form a circular ring-shaped tunnel, the raw material powder of the temperature measuring module is filled in the circular ring-shaped tunnel, and the raw material powder of the tool cutting body is filled again, and the axial pressure is applied again to obtain a milling temperature measuring tool blank; (2) Sintering the milling temperature measuring tool blank in a nitrogen atmosphere, applying axial pressure during the sintering process, and obtaining the milling temperature measuring tool.

3. The preparation method according to claim 2, characterized in that: The axial pressure in step (1) is 5-10 MPa, and the pressure holding time is 2 minutes; the axial pressure applied again is 10 MPa, and the pressure holding time is 2 minutes.

4. The preparation method according to claim 2, characterized in that: In step (2), the nitrogen atmosphere sintering pressure is 0.05 MPa; the axial pressure is 40 MPa; the sintering temperature is 1450° C. to 1550° C., and the holding time is 5 min.

5. The preparation method according to claim 2, characterized in that: The raw material powder of the tool cutting body in step (1) is selected from one of metal ceramic raw powder and cemented carbide raw powder; the raw material powder of the temperature measuring module is thermistor ceramic raw powder.

6. The preparation method according to claim 5, characterized in that: The method for preparing the original metal ceramic powder comprises: adding the powder raw material into anhydrous ethanol, ultrasonicating, vacuum drying, grinding after cooling, and sieving to obtain the original metal ceramic powder.

7. The preparation method according to claim 6, characterized in that: In terms of mass percentage, the powder raw material includes: 70% Ti(C,N), 10% Mo2C, 5% WC, 3% VC and 12% high entropy alloy powder; in terms of mass percentage, the high entropy alloy powder includes 19.9% ​​Fe, 21% Co, 21% Ni, 18.5% Cr and 19.6% Mn.

8. The preparation method according to claim 5, characterized in that: The method for preparing the thermosensitive ceramic original powder comprises: adding equal molar amounts of LaCrO3 and Y2O3 powders into anhydrous ethanol, ball milling, vacuum drying, and sieving to obtain the thermosensitive ceramic original powder.

Images