A multi-step online active measurement grinding method and device based on numerical control system

Abstract

The present invention provides a multi-step online active measurement and grinding method and device based on a numerical control system, specifically: S1, measuring a standard workpiece, calculating and storing calibration data; S2, performing a standard part zeroing operation on the standard workpiece, obtaining and storing standard part zeroing data; S3, transmitting the obtained calibration data and standard part zeroing data to the numerical control system; S4, setting a grinding allowance value of a workpiece to be processed; S5, using the calibration data and the standard part zeroing data, determining the corresponding relationship between the set grinding allowance and the AD value; S6, obtaining the AD value in real time during the processing process, and judging whether the real-time grinding allowance value reaches the set value according to the corresponding relationship in step S5, if so, ending the current stage of grinding and entering the next stage of grinding until all steps are ground; S7, measuring the processed sample, and compensating and fine-tuning the processing size of each step; one measuring instrument probe can complete the online active measurement and grinding of multiple steps.

Description

Technical Field

[0001] The present invention relates to the technical field of numerical control machining, and in particular to a multi-step online active measurement grinding method and device based on a numerical control system. Background Art

[0002] Active measuring instruments for grinding machines can improve machining quality by performing real-time workpiece measurements during the grinding process. Grinding parameters can be adjusted based on the measurement results, achieving high-precision machining of workpieces. Workpiece diameter variations can be stabilized at 3-5 μm. Active measuring instruments for grinding machines can also improve efficiency. Traditional grinding processes require manual measurement of workpiece dimensions. If dimensions do not meet the standards, repeated grinding is necessary after compensation. This requires constant testing and adjustment, which is time-consuming, labor-intensive, and inefficient. Active measuring instruments for grinding machines can achieve automated measurement and grinding control, reducing manual operations and improving machining efficiency. Due to the aforementioned advantages, active measuring instruments for grinding machines are widely used in grinding processes.

[0003] As my country's manufacturing industry gradually transforms and upgrades to high-end manufacturing, the requirements for parts processing dimensional accuracy and surface quality are becoming increasingly higher, and the requirements for processing efficiency are also becoming increasingly higher. Because CNC grinding machines are easy to automate and reduce manual operations, CNC grinding machines are gradually replacing ordinary manual grinding machines. Grinding processes are increasingly showing the appearance of multi-step shaft parts. The outer diameter accuracy requirements for each step of the parts are very high. To improve processing efficiency, it is hoped that multiple steps can be ground in a single clamping process. In order to meet the accuracy and stability of the outer diameter of multiple steps, two or even more active measuring instruments need to be installed. The cost of an active measuring instrument is relatively high, and if multiple active measuring instruments are installed, the cost of the grinding machine will be greatly increased. Therefore, in order to achieve active measurement grinding of multiple steps, reduce costs, and facilitate user operation, it is of great significance to develop a measuring probe based on a CNC system to complete online active measurement grinding of multiple steps. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-step online active measurement grinding method and device based on a numerical control system to solve the problem of how to achieve multi-step active measurement grinding while reducing costs. The specific technical solution is as follows:

[0005] A multi-step online active measurement grinding method based on a numerical control system, the method comprising the following steps:

[0006] S1. Measure the standard workpiece, determine the linear relationship between the grinding allowance and the AD value, calculate the calibration data and store it;

[0007] S2. Perform a standard part zeroing operation on the standard workpiece, obtain the standard part zeroing data, and store it;

[0008] S3, transmitting the calibration data in step S1 and the standard component zeroing data in step S2 to the numerical control system;

[0009] S4, setting the grinding allowance value of each step of the workpiece to be processed at each grinding stage;

[0010] S5, calling the calibration data and the standard part zero data in step S3 to determine the corresponding relationship between the grinding allowance value set for each step and the AD value;

[0011] S6, during the machining process, the AD value is obtained in real time, and the corresponding relationship in step S5 is combined to determine whether the real-time grinding allowance value reaches the set value of the grinding allowance. If it reaches, the current stage of grinding is ended and the next stage of grinding is entered until all steps are ground.

[0012] S7. Measure the sample workpiece after processing and make compensation and fine-tuning on the processing size of each step to ensure the subsequent processing accuracy.

[0013] Furthermore, the step S1 specifically includes:

[0014] S11, using a measuring instrument probe to measure the steps of a standard multi-step workpiece to obtain an electrical signal from a pressure sensing sensor;

[0015] S12, placing a gasket of known thickness between the measuring instrument probe jaw and the step, and obtaining the corresponding electrical signal from the pressure sensor;

[0016] S13. Convert the electrical signal of the pressure sensor into an AD value, determine the linear relationship between the grinding allowance and the AD value, and calculate the lever ratio K value in combination with the gasket thickness. The lever ratio K value is the calibration data.

[0017] Furthermore, the relationship between the grinding allowance and the AD value is A=(XB) / K.

[0018] Furthermore, the step S2 specifically includes:

[0019] S21, sequentially numbering the multiple steps of the standard multi-step workpiece;

[0020] S22. Use the side head of the measuring instrument to measure the pressure sensor signal corresponding to each step, and calculate the calibration coefficient B of each step based on the linear relationship between the grinding allowance and the AD value. The B value of all steps is the zero data of the standard part.

[0021] Furthermore, the grinding stage in step S4 includes four stages: rough grinding, semi-finishing grinding, fine grinding, and finish grinding, and the grinding allowance value decreases in the order of rough grinding, semi-finishing grinding, fine grinding, and finish grinding.

[0022] Furthermore, the step S6 specifically includes:

[0023] S61, starting from the first step, obtaining the electrical signal of the pressure sensor in real time, converting it into an AD value and transmitting it to the CNC system;

[0024] S62, combining the real-time uploaded AD value and the corresponding relationship between the grinding allowance value of the grinding stage set by the first step determined in step S5 and the AD value, to determine whether the real-time grinding allowance value reaches the grinding allowance setting value of the grinding stage;

[0025] S63: If the step is not reached, continue grinding; if the step is reached, end the current execution program and proceed to the next stage of grinding until the step is ground.

[0026] S64. Complete the grinding of the remaining steps in sequence according to steps S61 to S63.

[0027] Furthermore, the step S7 specifically includes:

[0028] S71. Measure the dimensions of each step of the processed multi-step workpiece sample to determine whether there is a deviation from the standard part dimensions.

[0029] S72. For steps with dimensional deviations, set compensation values ​​through the CNC system.

[0030] The present invention also provides a multi-step online active measurement grinding device based on a numerical control system, which is used to implement the above-mentioned multi-step online active measurement grinding method based on a numerical control system, and the device includes:

[0031] The side head of the measuring instrument is used to measure standard multi-step workpieces and perform real-time measurement of workpieces during machining;

[0032] The measuring instrument controller is used to receive the measurement data from the measuring instrument side head and process, store and transmit the data;

[0033] The numerical control system is used to receive data transmitted by the measuring instrument controller and process the data. It is also used to set and display data and run programs.

[0034] The output end of the measuring instrument side head is connected to the measuring instrument controller, and the measuring instrument controller is connected to the numerical control system via an NCUC bus.

[0035] Furthermore, the measuring instrument controller includes a signal processing module, a ROM memory module connected to the signal processing module, and an NCUC bus module connected to the ROM memory module;

[0036] The numerical control system includes an HMI interface, an NCU kernel module connected to the HMI interface, and an NCUC bus module connected to the NCU kernel module.

[0037] Furthermore, the signal processing module of the measuring instrument controller is used to receive and process the electrical signal of the pressure sensing sensor of the measuring instrument probe;

[0038] The ROM memory of the measuring instrument controller is used to store the calibration data and the standard part zero data obtained by the signal processing module;

[0039] The NCUC bus module is used to transmit data;

[0040] The NCU core module is used to receive, process and call data uploaded by the measuring instrument controller;

[0041] The HMI interface is mainly used to display and set instrument parameters.

[0042] The present invention provides a multi-step online active measurement grinding method and device based on a numerical control system, which has the following beneficial effects:

[0043] 1. The present invention provides a multi-step online active measurement grinding method and device based on a numerical control system. Data is transmitted via the NCUC bus protocol, with a communication cycle of 1ms and a fast response speed. It can monitor the outer cylindrical dimensions of the workpiece during the grinding process in real time. At the same time, the measuring instrument data is directly processed on the numerical control system, thereby faster controlling the grinding process and achieving better grinding results.

[0044] 2. The present invention provides a multi-step online active measurement grinding method and device based on a numerical control system, which supports the grinding of a maximum of 16 steps of the outer circle, and can reduce the cost of configuring a grinding machine with multiple active measuring instruments. The more steps that need to be ground on the workpiece, the more obvious the cost advantage.

[0045] 3. The present invention provides a multi-step online active measurement grinding method and device based on a numerical control system, and develops a measuring instrument parameter setting interface, such as: standard part zeroing operation, grinding stage allowance setting, with a more intuitive display effect and more convenient and quick operation. In addition, the measuring instrument controller and the numerical control system device are connected via the NCUC bus, which facilitates wiring. The measuring instrument data display is integrated into the numerical control system interface, eliminating the need to install a traditional measuring instrument display specifically on the grinding machine hanger, saving installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a flow chart of a multi-step online active measurement grinding method based on a numerical control system;

[0047] Figure 2 It is a multi-step online active measurement method based on a numerical control system - a workpiece size diagram during the implementation process of the grinding method;

[0048] Figure 3It is a structural diagram of a multi-step online active measurement grinding device based on a numerical control system;

[0049] Figure 4 This is an interface diagram of a multi-step online active measurement grinding device based on a numerical control system;

[0050] Figure 5 This is an interface diagram of a multi-step online active measurement grinding device based on a numerical control system;

[0051] Figure 6 This is an interface diagram of a multi-step online active measurement grinding device based on a numerical control system;

[0052] Figure 7 This is an interface diagram of a multi-step online active measurement grinding device based on a numerical control system;

[0053] Figure 8 This is an interface diagram of a multi-step online active measurement grinding device based on a numerical control system. DETAILED DESCRIPTION

[0054] The following will be combined with the accompanying drawings provided by the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are all in a very simplified form and are not in exact proportions. They are only used to facilitate and clearly illustrate the purpose of the embodiments of the present invention.

[0055] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connection" and "connected" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the description of the present invention, terms such as "up", "down", "left", "right", "front", "back", "center", "horizontal", "vertical", "top", "bottom", "inside", and "outside" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0057] Example 1: See Figure 1 The embodiment shown provides a multi-step online active measurement grinding method based on a numerical control system, the method comprising the following steps:

[0058] S1. Measure the standard workpiece, determine the linear relationship between the grinding allowance and the AD value, calculate the calibration data and store it;

[0059] Specifically, a standard multi-step workpiece is measured using a measuring probe. The probe jaws are clamped on the steps of the workpiece to obtain the displacement of the probe jaws and the corresponding pressure sensor signal. The displacement of the probe jaws and the pressure sensor signal are linearly related, and the pressure sensor signal can be converted into an AD value. Therefore, the displacement of the probe jaws and the AD value are also linearly related, and the corresponding grinding allowance and AD value are also linearly related. The calculation formula for the grinding allowance is A = (X–B) / K, where A is the grinding allowance, X is the AD value, K is the lever ratio, and B is the calibration coefficient.

[0060] Place the probe jaw of the measuring instrument on one of the steps of a standard multi-step workpiece. It is best to choose a step of appropriate size to prevent the step size from being too large or too small, and the pressure sensor signal obtained will be inaccurate. If the displacement of the probe jaw at this time is recorded as A1, the AD value corresponding to the pressure sensor signal obtained is X1. A gasket of known thickness is placed between the probe jaw of the measuring instrument and the step. The displacement of the probe jaw at this time is recorded as A2, and the AD value corresponding to the pressure sensor signal is X2. A2-A1 is the thickness of the gasket, which is a known quantity. The leverage ratio K value is calculated and is the calibration data, which is saved.

[0061] S2. Perform a standard part zeroing operation on the standard workpiece, obtain the standard part zeroing data, and store it;

[0062] Specifically, the steps of the standard multi-step workpiece are numbered in sequence. Currently, a maximum of 16 steps can be supported, which can be numbered 1, 2, 3...16. Starting from the first step, the measuring jaws of the measuring instrument are stuck on the step. Because it is a standard workpiece, the grinding allowance is 0 at this time. The lever ratio K has been calculated according to the method in step S1. The value of the calibration coefficient B1 can be calculated using the formula A=(X-B) / K. Since A=0, the calibration coefficient B1 of the first step is equal to the AD value at this time. Using the same method, the calibration coefficient B values ​​corresponding to the remaining steps of the workpiece can be obtained in turn, that is, B2, B3...B16. The B values ​​of all steps of the workpiece are the zero data of the standard part.

[0063] S3, transmitting the calibration data in step S1 and the standard component zeroing data in step S2 to the numerical control system;

[0064] S4, setting the grinding allowance value of each step of the workpiece to be processed at each grinding stage;

[0065] Specifically, the grinding allowances of the rough grinding, semi-finishing grinding, finishing grinding and polishing stages of each step of the workpiece to be processed are manually set through the human-computer interactive interface. The grinding allowances decrease in the order of rough grinding, semi-finishing grinding, finishing grinding and polishing. The rough grinding stage refers to removing the irregular surface produced by casting and forging on the blank, and performing simple processing according to the requirements of the parts to remove most of the grinding allowances so that the workpiece forms a rough multi-step shape. The semi-finishing grinding stage needs to meet certain precision requirements, complete the processing of some minor surfaces, and prepare for the finishing of the main surfaces to ensure that a certain processing allowance is left. The processing accuracy and surface finish of the finishing are higher than those of various processing processes of the corresponding processing methods. The processing accuracy of precision machining is generally 10 to 0.1 μm. When the grinding allowance is about to be ground out, polishing is carried out, and the elastic deformation of the process system is restored to the required size.

[0066] S5, calling the calibration data and the standard part zero data in step S3 to determine the corresponding relationship between the grinding allowance value set for each step and the AD value;

[0067] Specifically, the calibration data in step S3 and the zero data of the standard part of each step number of the workpiece to be processed are called, and the corresponding relationship between the grinding allowance and the AD value of each grinding stage set for each step is determined according to the linear relationship A=(X–B) / K between the grinding allowance and the AD value;

[0068] S6, during the machining process, the AD value is obtained in real time, and the corresponding relationship in step S5 is combined to determine whether the real-time grinding allowance value reaches the set value of the grinding allowance. If it reaches, the current stage of grinding is ended and the next stage of grinding is entered until all steps are ground.

[0069] Specifically, during the grinding process of the step workpiece, the pressure sensor signal of the side head of the measuring instrument is converted into an AD value and uploaded to the CNC system in real time. Combined with the correspondence between the grinding allowance and the AD value of each grinding stage determined in step 5, the program execution process is controlled in real time. When the real-time grinding allowance is less than or equal to the set value of the grinding allowance, the current stage of grinding is ended and the next stage of grinding is entered until all steps are ground. At the same time, the process program operation and the measuring instrument data can be monitored through the interface to control the step grinding size in real time.

[0070] In a specific implementation process, the workpiece to be ground is 5 steps, and the workpiece size is as follows: Figure 2 As shown, the G code for workpiece grinding in the CNC system is as follows:

[0071]

[0072]

[0073]

[0074] Call the data corresponding to the step number. M171 notifies the system to call the calibration data, standard part zero data, and grinding stage allowance data (A1, A2, A3, size to offset) of step 1. M172 notifies the system to call the calibration data, standard part zero data, and grinding stage allowance data (A1, A2, A3, size to offset) of step 2; M173, M174, M175 and so on. According to the AD value uploaded in real time, the real-time grinding allowance value is obtained through linear relationship operation. As step 1 progresses in grinding, the real-time grinding allowance decreases continuously in the rough grinding stage. When the real-time grinding allowance is less than or equal to the rough grinding stage allowance A1, the CNC system terminates the execution of the current line of G31 L1 G1 U-1F1, executes the next line of program, and enters the semi-finishing grinding stage; in the semi-finishing grinding stage, when the real-time grinding allowance is less than or equal to the semi-finishing grinding stage allowance A2, the CNC system terminates the execution of the current line of G31 L2 G1 U-1F0.4, executes the next line of program, and enters the fine grinding stage; in the fine grinding stage, when the real-time grinding allowance is less than or equal to the fine grinding stage allowance A3, the CNC system terminates the execution of the current line of G31L3 G1 U-1F0.1, executes the next line of program, and enters the polishing stage; in the polishing stage, when the real-time grinding allowance is equal to 0, the CNC system terminates G31 L4 G1 U-1F0.02 executes the current line, executes the next line of program, returns to the safe position, and the grinding of this step is completed. Then the grinding of steps 1 to 5 is carried out in sequence.

[0075] S7. Measure the sample workpiece after processing and make compensation and fine-tuning on the processing size of each step to ensure the subsequent processing accuracy.

[0076] Specifically, the multi-step workpiece samples that have been processed are measured. For steps with dimensional deviations, compensation values ​​are set through the CNC system. The compensation value setting range is -450 to +450μm, thereby fine-tuning the grinding size.

[0077] Example 2: See Figure 2 As shown, this embodiment provides a multi-step online active measuring grinding device based on a numerical control system, which includes a numerical control system, a measuring instrument controller and a measuring instrument side head. The numerical control system includes an HMI interface, an NCU core module connected to the HMI interface, and an NCUC bus module connected to the NCU core module. The measuring instrument controller includes a signal processing module, a ROM memory module connected to the signal processing module, and an NCUC bus module connected to the ROM memory module. The output end of the measuring instrument side head is connected to the signal processing module of the measuring instrument controller, and the NCUC bus module of the numerical control system is connected to the NCUC bus module of the measuring instrument controller.

[0078] Optionally, the measuring instrument probe is used to measure standard multi-step workpieces and to perform real-time measurement of the workpiece during the machining process. The measuring instrument probe's probe claw is clamped on the workpiece step, and the pressure sensing sensor can generate an electrical signal. The electrical signal value generated is different for different step sizes. As the step size changes, the electrical signal value generated also changes.

[0079] Optionally, the signal processing module of the measuring instrument controller is used to receive and process the electrical signal of the pressure sensing sensor of the measuring instrument probe, convert the electrical signal of the pressure sensing sensor into an AD value, and obtain the calibration data K value and the standard part zero data B value of each step through calculation based on the linear relationship between the grinding allowance and the AD value.

[0080] Optionally, the ROM memory of the measuring instrument controller is used to store calibration data and standard part zero data obtained by the signal processing module, so that the measuring instrument controller can be used on any CNC system.

[0081] The optional NCUC bus module of the measuring instrument controller and the NCUC bus module of the CNC system are used to transmit data. This data includes calibration data obtained through standard part measurement, standard part zero data, and AD values ​​of pressure sensor electrical signals acquired in real time during machining. The NCUC bus protocol has a communication cycle of 1ms, providing a fast response speed and enabling real-time monitoring of the external diameter of the workpiece during grinding.

[0082] Optionally, the NCU kernel module of the numerical control system is used to receive, process and call data uploaded by the measuring instrument controller. The NCU kernel module first receives the calibration data and standard part zero data transmitted from the measuring instrument controller. After setting the grinding allowance of each stage of each step through the HMI section, the NCU kernel module calls the calibration data and the standard part zero data corresponding to the step number, and determines the correspondence between the AD value and the grinding allowance of each stage set for the step based on the linear relationship between the grinding allowance and the AD value. At the same time, during the processing process, the NCU kernel module can judge the size relationship between the real-time grinding allowance and the grinding allowance setting value based on the real-time uploaded AD value, thereby controlling the program to execute each step of the processing process.

[0083] Optionally, the HMI interface is mainly used to display and set measuring instrument parameters, including standard part zeroing operation, grinding stage allowance setting, compensation fine-tuning setting, etc.

[0084] See Figure 3 The following figure shows the multi-step online measurement function interface. Change the user parameter 010804 to 10, which means that the online measurement and grinding of 10 steps of the workpiece can be supported. Figure 4 The following is the interface for standard parts zeroing operation. Click the menu for standard parts zeroing on the system interface to perform the probe calibration operation. Figure 5The figure shows the allowance setting interface of the grinding stage. The step number can be switched by pressing the previous and next pillow block menu buttons. Figure 6 The figure shows the compensation fine-tuning setting interface. The set compensation value can be directly added to the grinding allowance. Fine-tuning can also be performed through the compensation + and compensation - menu buttons. For example, if the grinding size of a step is 3um larger and you want to grind 3um more downward, press "compensation +" 3 times, otherwise press "compensation -" 3 times. Figure 7 As shown, this is the interface for monitoring the operation of the processing program and measuring instrument data during the processing.

[0085] In specific implementation, the numerical control system of the present invention preferably adopts the Huazhong numerical control grinding machine system, that is, the embodiment of the present invention provides a multi-step online active measurement grinding method and device based on the Huazhong numerical control grinding machine system.

[0086] Those skilled in the art should understand that the present invention can be implemented in many other specific forms without departing from the spirit and scope of the present invention. Based on the embodiments of the present invention, any changes and modifications made by ordinary technicians in the field of the present invention in accordance with the above disclosure are within the scope of protection of the claims.

Claims

1. A multi-step online active measurement grinding method based on a numerical control system, characterized in that: The method comprises the following steps: S1. Measure the standard multi-step workpiece, determine the linear relationship between the grinding allowance and the AD value, calculate the calibration data and store it; S2. Performing a standard part zeroing operation on a standard multi-step workpiece, obtaining standard part zeroing data, and storing the data; S3, transmitting the calibration data in step S1 and the standard component zeroing data in step S2 to the numerical control system; S4, setting the grinding allowance value of each step of the workpiece to be processed at each grinding stage; S5, calling the calibration data and the standard part zero data in step S3 to determine the corresponding relationship between the grinding allowance value set for each step and the AD value; S6, during the machining process, the AD value is obtained in real time, and the corresponding relationship in step S5 is combined to determine whether the real-time grinding allowance value reaches the set value of the grinding allowance. If it reaches, the current stage of grinding is ended and the next stage of grinding is entered until all steps are ground. S7. Measure the sample workpiece after processing and make compensation and fine-tuning on the processing size of each step to ensure the subsequent processing accuracy.

2. The multi-step online active measurement grinding method based on a numerical control system according to claim 1 is characterized in that: The step S1 specifically includes: S11, using a measuring instrument probe to measure the steps of a standard multi-step workpiece to obtain an electrical signal from a pressure sensing sensor; S12, placing a gasket of known thickness between the measuring instrument probe jaw and the step, and obtaining the corresponding electrical signal from the pressure sensor; S13. Convert the electrical signal of the pressure sensor into an AD value, determine the linear relationship between the grinding allowance and the AD value, and calculate the lever ratio K value in combination with the gasket thickness. The lever ratio K value is the calibration data.

3. The multi-step online active measurement grinding method based on a numerical control system according to claim 2 is characterized in that: The relationship between the grinding allowance and the AD value is A=(XB) / K, wherein A is the grinding allowance, X is the AD value, K is the lever ratio, and B is the calibration coefficient.

4. The multi-step online active measurement grinding method based on a numerical control system according to claim 1 is characterized in that: The step S2 specifically includes: S21, sequentially numbering the multiple steps of the standard multi-step workpiece; S22. Use the measuring instrument probe to measure the pressure sensor signal corresponding to each step, and calculate the calibration coefficient B of each step based on the linear relationship between the grinding allowance and the AD value. The B value of all steps is the zero data of the standard part.

5. The multi-step online active measurement grinding method based on a numerical control system according to claim 1, characterized in that: The grinding stages in step S4 include four stages: rough grinding, semi-finishing grinding, fine grinding, and finish grinding. The grinding allowance value decreases in the order of rough grinding, semi-finishing grinding, fine grinding, and finish grinding.

6. The multi-step online active measurement grinding method based on a numerical control system according to claim 1, characterized in that: The step S6 specifically includes: S61, starting from the first step, obtaining the electrical signal of the pressure sensor in real time, converting it into an AD value and transmitting it to the CNC system; S62, combining the real-time uploaded AD value and the corresponding relationship between the grinding allowance value of the grinding stage set by the first step determined in step S5 and the AD value, to determine whether the real-time grinding allowance value reaches the grinding allowance setting value of the grinding stage; S63: If the step is not reached, continue grinding; if the step is reached, end the current execution program and proceed to the next stage of grinding until the step is ground. S64. Complete the grinding of the remaining steps in sequence according to steps S61 to S63.

7. The multi-step online active measurement grinding method based on a numerical control system according to claim 1 is characterized in that: The step S7 specifically includes: S71. Measure the dimensions of each step of the processed multi-step workpiece sample to determine whether there is a deviation from the standard part dimensions. S72. For steps with dimensional deviations, set compensation values ​​through the CNC system.

8. A multi-step online active measurement grinding device based on a numerical control system, based on the multi-step online active measurement grinding method based on a numerical control system according to any one of claims 1 to 7, characterized in that: The device comprises: Measuring probe, used to measure standard multi-step workpieces and perform real-time measurement of workpieces during machining; The measuring instrument controller is used to receive the measurement data from the measuring instrument probe and process, store and transmit the data; The numerical control system is used to receive data transmitted by the measuring instrument controller and process the data. It is also used to set and display data and run programs. The output end of the measuring instrument probe is connected to the measuring instrument controller, and the measuring instrument controller is connected to the numerical control system via an NCUC bus.

9. The multi-step online active measurement grinding device based on a numerical control system according to claim 8, characterized in that: The measuring instrument controller includes a signal processing module, a ROM memory module connected to the signal processing module, and an NCUC bus module connected to the ROM memory module; The numerical control system includes an HMI interface, an NCU core module connected to the HMI interface, and an NCUC bus module connected to the NCU core module.

10. The multi-step online active measurement grinding device based on a numerical control system according to claim 9, characterized in that: The signal processing module of the measuring instrument controller is used to receive and process the electrical signal of the pressure sensing sensor of the measuring instrument probe; The ROM memory of the measuring instrument controller is used to store the calibration data and the standard part zero data obtained by the signal processing module; The NCUC bus module is used to transmit data; The NCU core module is used to receive, process and call data uploaded by the measuring instrument controller; The HMI interface is mainly used to display and set measuring instrument parameters.

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