On-line temperature detection device and method for main grinding area of outer circle longitudinal grinding

Abstract

The invention relates to an online detection device and method for the temperature of a main grinding area in outer circle longitudinal grinding. Comprising an integrated thermocouple, a single-chip microcomputer, a PC upper computer and a workpiece combination body, wherein the workpiece combination body is cut into two parts along the section of a spiral line according to the spiral line track of a main grinding area of a grinding wheel and a workpiece, and the spiral line track is calculated according to the rotating speed and the feeding speed of the workpiece in the longitudinal grinding process of outer circle grinding, and the integrated thermocouple is embedded into a combination interface of the workpiece combination body. The two parts of the workpiece combination body are fixedly connected through a fastener, a signal line embedded in the integrated thermocouple penetrates through a signal line channel in the workpiece combination body, and the single chip microcomputer fixedly installed on the workpiece combination body is wirelessly connected with the PC upper computer. The device is simple in structure and high in measurement precision, meets online monitoring and offline data storage at the same time, can be used for outer circle longitudinal grinding machining temperature measurement, can effectively solve the problem of outer circle grinding machining temperature measurement, and can monitor and store the temperature of an outer circle longitudinal grinding machining main grinding area in real time.

Description

Technical Field

[0001] The invention relates to the field of temperature measurement of a main grinding zone during cylindrical longitudinal grinding, and in particular to a device and method for measuring the temperature of relevant points in the main grinding zone during cylindrical longitudinal grinding. Background Art

[0002] Shaft parts are a typical part of mechanical structures and are widely used in various industries, such as transmission shafts, aerospace parts, etc. As an important process method for finishing the outer cylindrical surface of shaft parts, cylindrical longitudinal grinding can obtain high processing size accuracy, shape accuracy and surface quality. In cylindrical longitudinal grinding, the contact area between the workpiece and the grinding wheel can be divided into the main grinding area and the auxiliary grinding area. The main grinding area is the material removal area, and the auxiliary grinding area is the grinding and polishing area of ​​the grinding wheel on the workpiece. The main grinding area will generate a lot of heat. If the temperature of the main grinding area cannot be effectively controlled, it will cause large thermal stress and annealing on the workpiece surface, affecting the dimensional accuracy, hardness and surface quality of the workpiece.

[0003] In order to ensure that the surface temperature of the workpiece during the cylindrical longitudinal grinding process does not exceed the tolerable limit, thereby effectively improving the accuracy of the rotating body and the surface quality of the workpiece, researchers currently use common temperature measurement methods such as thermocouple method, light radiation method, thermal radiation method, metallographic structure method, etc. Among them, the commonly used radiation method can be used for wireless measurement using instruments such as infrared thermal imagers, but it is affected by factors such as the processing environment, grinding fluid, and workpiece obstruction, making it difficult to directly measure the temperature of the contact area, resulting in a large difference between the measurement results and the actual results. Among the current common temperature measurement methods, the thermocouple method is an effective method that can enter the main grinding area to directly measure the temperature of the workpiece in the processing area. It is a more reliable measurement method. However, during the cylindrical longitudinal grinding process, the high-speed rotation of the workpiece causes the signal line to be entangled, making data transmission difficult. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for online detection of the temperature of the main grinding zone of external cylindrical longitudinal grinding. Based on the characteristics of external cylindrical longitudinal grinding, thermocouples are arranged along the contact spiral line between the grinding wheel and the workpiece to collect the temperature of the main grinding area. Wireless transmission and storage of temperature signals are realized through a single-chip microcomputer to solve the technical problem of online monitoring of the temperature of the main grinding zone during external cylindrical longitudinal grinding.

[0005] To achieve the above-mentioned purpose, the technical solution provided by the present invention is: an online temperature detection device for the main grinding area of ​​external cylindrical longitudinal grinding, comprising an integrated thermocouple, a single-chip microcomputer, a PC host computer, and a workpiece assembly cut into two parts along the spiral line section according to the spiral line trajectory of the main grinding area of ​​the grinding wheel and the workpiece calculated according to the workpiece rotation speed and feed speed in external cylindrical longitudinal grinding, the integrated thermocouple is embedded in the bonding interface of the workpiece assembly, the two parts of the workpiece assembly are fixedly connected by a fastener, the signal line embedded in the integrated thermocouple passes through the signal line channel inside the workpiece assembly, and is connected to the single-chip microcomputer fixedly installed on the workpiece assembly, so as to collect the temperature signal of the main grinding area and transmit it to the single-chip microcomputer, and the single-chip microcomputer is wirelessly connected to the PC host computer.

[0006] Furthermore, the workpiece is provided with a blind hole for accommodating the integrated thermocouple, a threaded hole for connecting the two parts of the workpiece assembly, and a signal line channel.

[0007] Furthermore, the workpiece assembly is installed between the headstock and the tailstock; the single-chip microcomputer is waterproofly packaged and fixed to the end of the workpiece assembly by screws, and the single-chip microcomputer rotates together with the workpiece assembly during the external cylindrical longitudinal grinding process.

[0008] Furthermore, the integrated thermocouple is composed of multiple groups of thermocouple flat wires, two integrated blocks and three annular mica sheets; the integrated block material is an insulating material, and a number of micro grooves are processed on the integrated block for placing the thermocouple flat wires and signal lines. Two thermocouple flat wires made of different materials are symmetrically attached on both sides of the middle mica sheet to form a grinding temperature measurement point; a number of grinding temperature measurement points are arranged in a circumferential array along the middle mica sheet, and the two integrated blocks are connected and fixed together by screws.

[0009] Furthermore, the integrated thermocouple is fixedly connected to the workpiece assembly by screws; and two other layers of annular mica sheets are used to insulate the thermocouple flat wire from the workpiece assembly.

[0010] Furthermore, the single-chip microcomputer includes an MCU chip, a clock circuit, an ADC circuit, a button circuit, a power supply circuit, a wireless transmission module, and a storage card module. The entire single-chip microcomputer is controlled and operated by writing programming codes into the MCU chip; the timer is configured through the program to trigger the ADC circuit module to collect signals, and then the data is sent to the host computer through the wireless transmission module through the MCU chip and transmitted to the storage card through the communication protocol.

[0011] Furthermore, the PC host computer includes a serial port configuration module, a serial port data reading module, a data processing and drawing module, a data saving module and a time module, and the real-time monitoring of the external cylindrical longitudinal grinding temperature is realized through the wireless connection between the PC host computer and the single-chip microcomputer and the integrated thermocouple.

[0012] The invention discloses a line detection method using an online temperature detection device for the main grinding area of ​​cylindrical longitudinal grinding. During the cylindrical longitudinal grinding process, a single chip microcomputer rotates together with a workpiece assembly, and receives a temperature signal collected by an integrated thermocouple in the main grinding area through a signal line. The single chip microcomputer is controlled by a configuration program to wirelessly transmit the temperature signal to a PC host computer at a certain frequency and save it in an SD card. After being processed by the PC host computer software, visual real-time monitoring of the temperature is realized, and at the same time, the single chip microcomputer transmits the collected temperature signal to a storage card through a communication protocol to realize data storage.

[0013] Furthermore, during the grinding process, the temperature causes the thermocouple to produce an electric potential difference. The ADC circuit in the microcontroller collects the thermoelectric potential signal, and then sends the temperature signal to the PC host computer via Bluetooth wireless transmission. After being processed by the Labview host computer software, visual real-time measurement and monitoring are realized. At the same time, the microcontroller establishes a FATFS file system in the SD card through the SPI protocol and writes the data to the SD card for subsequent reading, analysis and research.

[0014] Furthermore, by writing a program into the microcontroller, the ADC uses external event triggering acquisition and discontinuous conversion mode. When the workpiece is embedded with multiple thermocouples, the ADC multi-channel acquisition is turned on; then the timer is configured to generate a fixed-period PWM wave with a certain frequency F, and each PWM wave is triggered to trigger an ADC circuit conversion; then the DMA function is used to move the collected data; the data collected by the ADC is placed in the DMA register, and an interrupt is generated when the register is full, and then the data processing chip reads and transmits the data.

[0015] Beneficial effects of the present invention:

[0016] The device and method for measuring the temperature of the main grinding area of ​​the external cylindrical longitudinal grinding of the present invention have a simple structure, low cost, high and reliable measurement accuracy, and can simultaneously meet the requirements of online monitoring and offline data storage, and can be used for measuring the temperature of the external cylindrical longitudinal grinding. Through the device, the problem of measuring the temperature of the external cylindrical grinding is effectively solved, and the temperature of the main grinding area of ​​the external cylindrical longitudinal grinding can be effectively monitored and stored in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the installation and use status of the online temperature detection device for the main grinding zone of the outer cylindrical longitudinal grinding of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the online temperature detection device for the main grinding zone of the outer cylindrical longitudinal grinding of the present invention;

[0019] Figure 3 It is a schematic diagram of the integrated thermocouple structure in the online temperature detection device of the main grinding zone of the outer cylindrical longitudinal grinding of the present invention;

[0020] Figure 4 It is a side view of the first component of the thermocouple in the integrated thermocouple of the device of the present invention;

[0021] Figure 5 It is a schematic diagram of the structure of the first component of the workpiece of the device of the present invention;

[0022] Figure 6 It is a schematic diagram of the structure of the second component of the workpiece of the device of the present invention;

[0023] Figure 7 is a side view of the second component structure of the workpiece of the device of the present invention;

[0024] Figure 8 It is a schematic diagram of installing the single chip microcomputer on the second component of the workpiece in the device of the present invention;

[0025] Fig. 9 It is a schematic diagram of the grinding processing area when the device of the present invention is measuring temperature;

[0026] Fig.10 It is a flow chart of the device of the present invention for online measuring the cylindrical grinding temperature;

[0027] Fig.11 It is a working schematic diagram of the single chip microcomputer in the device of the present invention;

[0028] In the figure: 1-headstock; 2-single chip microcomputer; 3-grinding wheel; 4-integrated thermocouple; 5-workpiece assembly; 6-tailstock; 41-mica sheet one; 42-thermocouple first component; 421-screw connection hole one; 422-thermocouple wire microgroove one; 423-thermocouple wire microgroove two; 43-mica sheet two; 44-thermocouple flat wire; 45-thermocouple second component; 451-screw connection hole two; 452-thermocouple wire microgroove three; 453- Four microgrooves of the thermocouple wire; 46-three mica sheets; 51-the first component of the workpiece; 511-positioning protrusions; 512-three screw connection holes; 513-one countersunk hole; 514-one top hole; 52-the second component of the workpiece; 521-positioning countersunk hole; 522-one screw hole; 523-two countersunk holes; 524-two screw holes; 525-one thermocouple wire channel; 526-two thermocouple wire channel; 527-two top holes; 528-positioning shoulder. DETAILED DESCRIPTION

[0029] The present invention is described in detail below by taking cylindrical grinding as an example with reference to the accompanying drawings:

[0030] like Figure 1As shown, an embodiment of the present invention provides an online temperature detection device for the main grinding zone of a cylindrical longitudinal grinding, comprising a single-chip microcomputer 2, an integrated thermocouple 4, a workpiece assembly 5, and a PC host computer. The workpiece assembly 5 is provided with an integrated thermocouple 4, and the integrated thermocouple 4 is provided with a plurality of groups of thermocouple flat wires 44. One end of the thermocouple flat wire 44 is flush with the outer cylindrical surface of the workpiece assembly 5, and the other end of the thermocouple flat wire 44 is electrically connected to the single-chip microcomputer 2 sleeved on one end of the workpiece assembly 5 through a thermocouple wire channel provided in the workpiece assembly 5. The inclination angle of the connection interface of the internal components of the integrated thermocouple 4 and the workpiece assembly 5 is ψ, and the two inclination angles are in the same direction; the online detection device can be supported on the headstock 1 and the tailstock 6 of the grinder through the top holes at both ends of the workpiece assembly 5; when the grinder is working, the grinding wheel 3 on the grinding wheel frame grinds the workpiece assembly 5, and the thermocouple flat wire 44 in the integrated thermocouple 4 senses the grinding temperature, and its thermoelectric potential temperature signal is transmitted to the PC host computer through the single-chip microcomputer 2 in wireless transmission mode for data analysis and processing.

[0031] like Figure 2 to Figure 4 As shown, the integrated thermocouple 4 includes a mica sheet 1 41, a mica sheet 2 43, a mica sheet 3 46, a first thermocouple component 42, a second thermocouple component 45 and a thermocouple flat wire 44. The inclination angle of a pair of planes relative to the first thermocouple component 42 and the second thermocouple component 45 is ψ. The two side surfaces of the mica sheet 2 43 are symmetrically fitted with two thermocouple flat wires 44 made of different materials; one end of the thermocouple flat wire 44 is flush with the outer cylindrical surface of the mica sheet 2 43, and every two thermocouple flat wires 44 made of different materials on both sides form a grinding temperature measurement point; a plurality of grinding temperature measurement points are arranged in a circumferential array along the mica sheet 2 43; the other end of the thermocouple flat wire 44 respectively passes through the thermocouple wire micro groove 1 422 and the thermocouple wire micro groove 2 423 arranged on the outer cylindrical surface and end surface of the first thermocouple component 42 and enters the first thermocouple component 42 and the thermocouple wire micro groove three 452 and the thermocouple wire micro groove four 453 provided on the outer cylindrical surface and the end surface of the thermocouple second component 45 to enter the central through hole of the thermocouple second component 45; when in use, the mica sheet 1 41 and the mica sheet 3 46 are attached to the two sides of the mica sheet 2 43, and a group of screws are passed through the screw connection hole 1 421 provided in the thermocouple first component 42 and the screw connection hole 2 451 provided in the thermocouple second component 45 to axially position the mica sheet 1 41, the mica sheet 2 43 and the mica sheet 3 46, and the mica sheet 2 43 is pressed in the middle, so that the two sides of the thermocouple first component 42 and the thermocouple second component 45 are attached to the outer side of the thermocouple flat wire 44 through the mica sheet 1 41 and the mica sheet 3 46, so that the thermocouple flat wire 44 is insulated from the workpiece assembly 5,

[0032] Specific production methods, such as Figure 2 , Figure 3 and Figure 4As shown, three elliptical mica sheets consistent with the cutting cross-section of the workpiece are obtained, and two thermocouple flat wires 44 of different materials with a width of about 1 mm and a thickness of about 10 μm are symmetrically bonded on both sides of the middle mica sheet 2 43, and every two thermocouple flat wires 44 on both sides form a grinding temperature measurement point; a number of grinding temperature measurement points are arranged in a circumferential array along the mica sheet 2 43, and then two pieces of thermocouple first component 42 and thermocouple second component 45 made of insulating high-temperature resistant materials are used to press the mica sheet 2 43 in the middle, and the signal line connected to each thermocouple flat wire 44 is installed in the thermocouple wire micro groove 1 422 and the thermocouple wire micro groove 3 452 respectively; then two mica sheets 1 41 and mica sheet 3 46 are bonded to both sides of the thermocouple flat wire 44 to insulate the thermocouple flat wire 44 from the workpiece assembly 5 to form an outer cylindrical longitudinal grinding thermocouple.

[0033] like Figure 2 and Figure 5 to Figure 7 As shown, the workpiece assembly 5 includes a first workpiece component 51 and a second workpiece component 52. The inclination angle of a pair of planes relative to the first workpiece component 51 and the second workpiece component 52 is ψ. The inclined side plane of the first workpiece component 51 is provided with two positioning protrusions 511 and a countersunk hole 1 513, and the inclined side plane of the second workpiece component 52 is provided with two positioning countersunk holes 521 and a countersunk hole 2 523; a screw connection hole 3 512 is provided in the first workpiece component 51 corresponding to each positioning protrusion 511; a top hole 514 is provided on the other end surface of the first workpiece component 51 relative to the countersunk hole 1 513; a screw hole 1 522 is provided in the second workpiece component 52 corresponding to each positioning countersunk hole 521; a circle of screw holes 2 524 is provided on the inner side end surface of the countersunk hole 2 523; a thermocouple wire channel 1 525 and a thermocouple wire channel 2 526 are provided in sequence inwardly corresponding to the countersunk hole 2 523; the second workpiece component 52 is provided with a screw hole 524 on the other side relative to the inclined side plane A positioning shoulder 528 is provided, and a second thermocouple wire channel 526 passes through the cylindrical surface where the positioning shoulder 528 is located; during grinding, a group of screws are used to fix the integrated thermocouple 4 on the side bottom surface of the second countersunk hole 523 of the second component 52 of the workpiece through the screw connection hole 421, the second screw connection hole 451 and the second screw hole 524 in sequence; the first thermocouple component 42 and the second thermocouple component 45 at both ends of the integrated thermocouple 4 are circumferentially positioned by the countersunk hole 513 of the first component 51 of the workpiece and the countersunk hole 523 of the second component 52 of the workpiece; two screws are used to connect the screw hole 522 of the second component 52 of the workpiece through the screw connection hole 512 of the first component 51 of the workpiece, at this time, the positioning protrusion 511 of the first component 51 of the workpiece is embedded in the positioning countersunk hole 521 of the second component 52 of the workpiece, so that the first component 51 of the workpiece presses the integrated thermocouple 4 on the inclined side plane of the second component 52 of the workpiece from the side of the inclined side plane. A second center hole 527 is provided on the other end surface of the second workpiece component 52 relative to the inclined side plane, which is used to support the workpiece assembly 5 during grinding.

[0034] like Figure 6 and Figure 8 As shown, the single-chip microcomputer 2 is axially positioned and installed on the positioning shoulder 528 of the second component 52 of the workpiece through a set of fixing blocks, and the thermocouple flat wire 44 in the integrated thermocouple 4 is electrically connected to the collection terminal of the single-chip microcomputer 2 through the thermocouple wire channel 1 525 and the thermocouple wire channel 2 526 in turn.

[0035] like Fig. 9 As shown in the figure, during the longitudinal cylindrical grinding process, the area where the grinding wheel and the workpiece interact is divided into the main grinding area and the auxiliary grinding area. Since it is longitudinal grinding, the helix angle of the main grinding area is θ, and its expression is

[0036]

[0037] Where: v f is the longitudinal feed speed of the workpiece; v w It is the surface linear velocity of the workpiece when it rotates.

[0038] In order to reduce the influence of various factors during the grinding process, the inclination angle ψ of the two components of the integrated thermocouple 4 and the workpiece assembly 5 is taken as θ, so that the temperature signal collected by the multiple thermocouple flat wires 44 provided in the integrated thermocouple 4 can be used to judge the abnormal value and average the temperature signal.

[0039] like Figures 1 to 8 As shown, during use, the method of the present invention cuts the workpiece into two parts, a first workpiece component 51 and a second workpiece component 52, along a cutting line at a certain angle to the cross section of the workpiece, and then embeds an integrated thermocouple 4; the first workpiece component 51 and the second workpiece component 52 are fixedly connected by screws, and then the workpiece assembly 5 is installed between the headstock 1 and the tailstock 6; the single-chip microcomputer 2 is waterproofly packaged and the single-chip microcomputer 2 is positioned and installed on the second workpiece component 52 by a fixed block, and rotates together with the workpiece assembly 5 during the external cylindrical longitudinal grinding process; the single-chip microcomputer 2 is connected to the thermocouple flat wire 44 of the integrated thermocouple 4 through a signal line, so that the temperature signal of the main grinding area can be collected.

[0040] The single-chip computer 2 includes an MCU chip, a clock circuit, an ADC circuit, a key circuit, a power circuit and other circuits, as well as a wireless transmission module and a storage card module; the entire system is controlled and operated by writing programming codes into the MCU chip. The timer is configured through the program to trigger the ADC circuit module to collect signals, and then the data is sent to the host computer through the wireless transmission module through the MCU chip and transmitted to the storage card through the communication protocol.

[0041] The PC host computer includes a serial port configuration module, a serial port data reading module, a data processing and drawing module, a data saving module and a time module. The real-time monitoring of the external cylindrical longitudinal grinding temperature is achieved through the wireless connection between the host computer and the signal acquisition system.

[0042] like Fig.10 As shown, during the grinding process, the change in grinding temperature causes the thermocouple to generate thermoelectric potential. The ADC circuit in the single-chip computer 2 collects the thermoelectric potential signal, and then sends the thermoelectric potential signal to the PC host computer through Bluetooth wireless transmission. The PC host computer displays the measurement results in real time in the temperature visualization interface after data processing by the Labview host computer software; at the same time, the single-chip computer 2 establishes a FATFS file system in the SD storage card through the SPI communication protocol, and writes the data to the SD card, which is convenient for subsequent reading and analysis.

[0043] like Fig.11 As shown, by writing a program to the STM32 microcontroller 2, the ADC uses external event triggering acquisition and discontinuous conversion mode. When the workpiece is embedded with multiple thermocouples, the ADC multi-channel acquisition can be turned on; then the timer is configured to generate a fixed-period PWM wave with a certain frequency F, and each PWM wave will trigger an ADC circuit conversion; then the DMA (Direct Memory Access) function is used to move the collected data; the data collected by the ADC will be placed in the DMA register, and an interrupt will be generated when the register is full, and then the data processing chip will read and transmit the data.

Claims

1. An online temperature detection device for the main grinding zone of cylindrical longitudinal grinding, characterized in that: It includes an integrated thermocouple, a single-chip microcomputer, a PC host computer, and a workpiece assembly cut into two parts along a spiral line section according to the spiral line trajectory of the main grinding area of ​​the grinding wheel and the workpiece calculated according to the workpiece rotation speed and feed speed in the external cylindrical longitudinal grinding. The integrated thermocouple is embedded in the bonding interface of the workpiece assembly. The two parts of the workpiece assembly are fixedly connected by fasteners. The signal line embedded in the integrated thermocouple passes through the signal line channel inside the workpiece assembly and is connected to the single-chip microcomputer fixedly installed on the workpiece assembly. It is used to collect the temperature signal of the main grinding area and transmit it to the single-chip microcomputer. The single-chip microcomputer is wirelessly connected to the PC host computer.

2. The on-line temperature detection device for the main grinding zone of cylindrical longitudinal grinding according to claim 1 is characterized in that: The workpiece assembly is provided with a blind hole for accommodating an integrated thermocouple, a threaded hole for connecting two parts of the workpiece assembly, and a signal line channel.

3. The on-line temperature detection device for the main grinding zone of cylindrical longitudinal grinding according to claim 1 is characterized in that: The workpiece assembly is installed between the headstock and the tailstock; the single-chip microcomputer is waterproofly packaged and fixed to the end of the workpiece assembly by screws, and the single-chip microcomputer rotates together with the workpiece assembly during the external cylindrical longitudinal grinding process.

4. The on-line temperature detection device for the main grinding zone of cylindrical longitudinal grinding according to claim 1 is characterized in that: The integrated thermocouple consists of multiple groups of thermocouple flat wires, two integrated blocks and three annular mica sheets; the integrated block material is insulating material, and a number of micro grooves are processed on the integrated block to place the thermocouple flat wires and signal lines. Two thermocouple flat wires made of different materials are symmetrically attached on both sides of the middle mica sheet to form a grinding temperature measurement point; a number of grinding temperature measurement points are arranged in a circumferential array along the middle mica sheet, and the two integrated blocks are connected and fixed together by screws.

5. The on-line temperature detection device for the main grinding zone of cylindrical longitudinal grinding according to claim 4 is characterized in that: The integrated thermocouple is fixedly connected to the workpiece assembly by screws; and two other layers of annular mica sheets are used to insulate the thermocouple flat wire from the workpiece assembly.

6. The on-line temperature detection device for the main grinding zone of cylindrical longitudinal grinding according to claim 1 is characterized in that: The single-chip microcomputer includes an MCU chip, a clock circuit, an ADC circuit, a button circuit, a power supply circuit, a wireless transmission module, and a storage card module. The entire single-chip microcomputer is controlled and operated by writing programming codes into the MCU chip. The timer is configured through the program to trigger the ADC circuit module to collect signals, and then the data is sent to the host computer through the wireless transmission module through the MCU chip and transmitted to the storage card through the communication protocol.

7. The on-line temperature detection device for the main grinding zone of cylindrical longitudinal grinding according to claim 1 is characterized by: The PC host computer includes a serial port configuration module, a serial port data reading module, a data processing and drawing module, a data saving module and a time module. The PC host computer is wirelessly connected with the single-chip microcomputer and the integrated thermocouple to realize real-time monitoring of the external cylindrical longitudinal grinding temperature.

8. An online detection method using the online detection device for the temperature of the main grinding zone of cylindrical longitudinal grinding according to any one of claims 1 to 7, characterized in that: During the cylindrical longitudinal grinding process, the single-chip microcomputer rotates with the workpiece assembly and receives the temperature signal collected by the integrated thermocouple in the main grinding area through the signal line. The single-chip microcomputer is controlled by the configuration program to wirelessly transmit the temperature signal to the PC host computer at a certain frequency and save it in the SD card. After being processed by the PC host computer software, the temperature can be visualized and monitored in real time. At the same time, the single-chip microcomputer transmits the collected temperature signal to the storage card through the communication protocol to realize data storage.

9. The online detection method according to claim 8, characterized in that: During the grinding process, the temperature causes the thermocouple to produce an electric potential difference. The ADC circuit in the microcontroller collects the thermoelectric potential signal, and then sends the temperature signal to the PC host computer via Bluetooth wireless transmission. After being processed by the Labview host computer software, visual real-time measurement and monitoring are realized. At the same time, the microcontroller establishes a FATFS file system in the SD card through the SPI protocol and writes the data to the SD card for later reading, analysis and research.

10. The online detection method according to claim 9, characterized in that: By writing a program into the microcontroller, the ADC uses external event triggering acquisition and discontinuous conversion mode. When the workpiece is embedded with multiple thermocouples, the ADC multi-channel acquisition is turned on; then the timer is configured to generate a fixed-period PWM wave with a certain frequency F, and each PWM wave is triggered to trigger an ADC circuit conversion; then the DMA function is used to move the collected data; the data collected by the ADC is placed in the DMA register, and an interrupt is generated when the register is full, and then the data processing chip reads and transmits the data.

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