Machine tool reverse control method and system based on cutting force detection

Abstract

The application discloses a machine tool reverse control method and system based on cutting force detection, and the machine tool comprises at least one intelligent tool holder, a plurality of mounting holes are formed in the intelligent tool holder, a flexible circuit board is arranged in each mounting hole, a strain sensor and a processing chip are arranged on the flexible circuit board, and the machine tool reverse control method comprises the following steps: the strain sensor collects deformation signals in the processing process of the intelligent tool holder; the processing chip transmits the deformation signals to an upper computer through a Bluetooth emission device; after a machine tool receiving device receives the control signals, the processing action of the intelligent tool holder is paused, and the deformation signals exceeding the normal range are transmitted to the upper computer; and the upper computer stores the received deformation signals. The application can enable the numerical control machine tool to quickly respond when an abnormality occurs, record tool holder working data, improve the safety of the numerical control machine tool operation, reduce the part rejection rate, and reduce the production cost.

Description

Technical Field

[0001] This invention relates to a machine tool reverse control method and system based on cutting force detection. Background Technology

[0002] Over the past 20 years, China's machine tool industry has made great strides. While the industry is now very large, it still lags behind advanced foreign technologies in high-precision core technologies.

[0003] CNC machine tools are among the most widely used CNC machine tools. They are mainly used for cutting and machining the inner and outer cylindrical surfaces, inner and outer conical surfaces with arbitrary cone angles, complex rotating inner and outer curved surfaces, and cylindrical and conical threads of shaft-type or disc-type workpieces. They can also perform grooving, drilling, reaming, boring, and other machining operations.

[0004] CNC machine tools automatically process workpieces according to pre-programmed machining programs. We compile the workpiece's machining process route, process parameters, tool movement trajectory, displacement, cutting parameters, and auxiliary functions into a machining program sheet according to the instruction codes and program format specified by the CNC machine tool. The contents of this program sheet are then recorded on a control medium and input into the CNC device of the CNC machine tool, thereby directing the machine tool to process the workpiece.

[0005] Existing CNC machine tools cannot respond in a timely manner when abnormalities occur during the machining process, resulting in poor safety of CNC machine tools and a high product scrap rate. Summary of the Invention

[0006] The technical problem to be solved by this invention is to overcome the shortcomings of existing CNC machine tools, which cannot respond in time when abnormalities occur during the machining process, resulting in poor safety of CNC machine tools and high product scrap rate. The invention provides a machine tool reverse control method and system based on cutting force detection that enables CNC machine tools to respond quickly when abnormalities occur, records tool holder working data, improves the safety of CNC machine tool operation, reduces part scrap rate and thus reduces production costs.

[0007] The present invention solves the above-mentioned technical problems through the following technical solution: A machine tool reverse control method based on cutting force detection, used in a CNC machine tool, characterized in that the CNC machine tool includes at least one intelligent tool holder, the intelligent tool holder has several mounting holes, each mounting hole contains a flexible circuit board, the flexible circuit board is equipped with a strain sensor and a processing chip, and the machine tool reverse control method includes: Strain sensors collect deformation signals during the machining process of the intelligent tool holder; The processing chip determines whether the deformation signal exceeds the normal range. If so, it transmits a control signal to the machine tool receiving device via a Bluetooth transmitter; otherwise, it transmits the deformation signal to the host computer via a Bluetooth transmitter. After receiving the control signal, the machine tool receiving device pauses the machining operation of the smart tool holder and transmits the deformation signal that exceeds the normal range to the host computer. The host computer stores the received deformation signals.

[0008] Preferably, the host computer stores the received deformation signal, including: The host computer stores the received deformation signals; Determine if the deformation signal exceeds the normal range; if so, issue a prompt.

[0009] Preferably, the machine tool reverse control method includes: The processing chip determines whether the deformation signal exceeds the normal range. If so, the control signal is transmitted to the machine tool receiving device via Bluetooth. The machine tool receiving device then transmits the control signal to the CNC machine tool controller. The processing chip converts the deformation signal exceeding the normal range into a digital signal and transmits it to the host computer via Bluetooth. Otherwise, the processing chip converts the deformation signal into a digital signal and transmits it to the host computer via a Bluetooth transmitter.

[0010] Preferably, the machine tool receiving device pauses the machining operation of the smart tool holder after receiving the control signal, including: After receiving the control signal, the machine tool receiving device pauses the machining operation of the smart tool holder; The processing chip sends control signals for self-testing to the CNC machine tool; The CNC machine tool runs a self-test program and determines whether there is any abnormal operating state. If so, it will issue a prompt; otherwise, it will use the automatic tool magazine to replace the tool with the intelligent tool holder.

[0011] Preferably, the process of changing the tool from the smart tool holder using an automatic tool magazine includes: Restart the CNC machine tool's machining operation from the last paused position; Strain sensors collect deformation signals during the machining process of the intelligent tool holder; The processing chip determines whether the deformation signal exceeds the normal range. If so, it transmits a control signal to the machine tool receiving device via a Bluetooth transmitter. After receiving the control signal, the machine tool receiving device stops the machining operation of the intelligent tool holder and notifies the host computer to issue a prompt.

[0012] Preferably, the method for manufacturing the intelligent knife handle is as follows: For a smart tool holder to be processed, obtain the tool holder model and material parameters of the smart tool holder to be processed; Several model mounting holes are made on the tool holder model according to a preset size to obtain the tool holder simulation model; Finite element simulation calculations were performed on the tool holder simulation model; Obtain the tool holder working parameters from the finite element simulation calculation; Determine whether the working parameters of the tool holder meet the preset requirements. If so, open the actual mounting holes on the smart tool holder to be processed according to the position of the model mounting holes in the tool holder simulation model. The strain sensor and the wireless communication device for transmitting the strain sensor's acquired signals are installed in the actual mounting hole.

[0013] Preferably, the step of creating a plurality of model mounting holes on the tool holder model according to a preset size to obtain a tool holder simulation model includes: Obtain the axial cross-sectional view of the tool holder model; Identify the lines on the outer and inner surfaces in the axial cross-sectional view; Obtain the horizontal distance between the outer and inner surfaces in the axial cross-sectional view; Mark areas where the horizontal distance is greater than the preset thickness; Several model mounting holes are made in the area to obtain a tool holder simulation model.

[0014] Preferably, the area where the horizontal distance of the marker is greater than the preset thickness includes: Identify the maximum length of all regions with a horizontal distance greater than the preset thickness; The region whose maximum length is greater than the preset length is displayed as the target region; Select the target area closest to the centerline of the smart tool holder to be processed as the area for opening the model mounting holes.

[0015] The present invention also provides a machine tool reverse control system based on cutting force detection, characterized in that the machine tool reverse control system is used to implement the machine tool reverse control method described above for production.

[0016] The present invention also provides a CNC machine tool, characterized in that the CNC machine tool is used to implement the machine tool reverse control method described above for production.

[0017] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0018] The positive and progressive effects of this invention are as follows: This application enables CNC machine tools to respond quickly when abnormalities occur and to record tool holder working data, thereby improving the safety of CNC machine tool operation and reducing the scrap rate of parts to reduce production costs. Attached Figure Description

[0019] Figure 1This is a flowchart of the machine tool reverse control method according to Embodiment 1 of the present invention.

[0020] Figure 2 This is another flowchart of the machine tool reverse control method of Embodiment 1 of the present invention. Detailed Implementation

[0021] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein. Example

[0022] In this embodiment, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] This embodiment provides a machine tool reverse control system based on cutting force detection, which is used in CNC machine tools.

[0024] The machine tool reverse control system includes an intelligent tool holder installed on the CNC machine tool and a host computer, which can be a computer or a server.

[0025] The intelligent tool holder has several mounting holes, and each mounting hole contains a flexible circuit board on which a strain sensor and a processing chip are mounted.

[0026] The CNC machine tool includes an intelligent tool holder.

[0027] Strain sensors are used to collect deformation signals during the machining process of intelligent tool holders; The processing chip is used to determine whether the deformation signal exceeds the normal range. If it does, it transmits a control signal to the machine tool receiving device through a Bluetooth transmitter; otherwise, it transmits the deformation signal to the host computer through a Bluetooth transmitter. The machine tool receiving device is used to pause the machining action of the smart tool holder after receiving the control signal, and to transmit the deformation signal that exceeds the normal range to the host computer; The host computer is used to store the received deformation signals.

[0028] The machine tool reverse control system of this embodiment enables the CNC machine tool to respond immediately when an abnormality occurs, and records the tool holder working data, thereby improving the safety of CNC machine tool operation and reducing the scrap rate of parts to reduce production costs.

[0029] Furthermore, the host computer is used to store the received deformation signal and determine whether the deformation signal exceeds the normal range; if so, it will issue a prompt.

[0030] The prompt can be a highlight or an alarm.

[0031] Furthermore, the processing chip is used to determine whether the deformation signal exceeds the normal range. If so, the control signal is transmitted to the machine tool receiving device via Bluetooth. The machine tool receiving device then transmits the control signal to the CNC machine tool controller. The processing chip converts the deformation signal exceeding the normal range into a digital signal and transmits it to the host computer via Bluetooth. Otherwise, the processing chip converts the deformation signal into a digital signal and transmits it to the host computer via a Bluetooth transmitter.

[0032] Furthermore, the machine tool receiving device is used to stop the machining operation of the smart tool holder after receiving the control signal; The processing chip is used to send control signals for self-testing to the CNC machine tool; The CNC machine tool is used to run a self-test program and determine whether there is an abnormal operating state. If so, it will issue a prompt; otherwise, it will use the automatic tool magazine to replace the tool with the intelligent tool holder.

[0033] The CNC machine tool uses an automatic tool magazine to change the tool of the intelligent tool holder, and then restarts the machining operation of the CNC machine tool from the previous pause position; The strain sensor is used to re-acquire the deformation signal during the machining process of the smart tool holder; The processing chip is used to determine whether the deformation signal exceeds the normal range. If so, it transmits a control signal to the machine tool receiving device through a Bluetooth transmitter. The machine tool receiving device is used to stop the machining operation of the smart tool holder after receiving the control signal and notify the host computer to issue a prompt.

[0034] The smart knife handle described in this embodiment is obtained through the following method: For a smart tool holder to be processed, obtain the tool holder model and material parameters of the smart tool holder to be processed; Several model mounting holes are made on the tool holder model according to a preset size to obtain the tool holder simulation model; Finite element simulation calculations were performed on the tool holder simulation model; Obtain the tool holder working parameters from the finite element simulation calculation; Determine whether the working parameters of the tool holder meet the preset requirements. If so, open the actual mounting holes on the smart tool holder to be processed according to the position of the model mounting holes in the tool holder simulation model. The strain sensor and the wireless communication device for transmitting the strain sensor's acquired signals are installed in the actual mounting hole.

[0035] The step of creating several model mounting holes on the tool holder model according to a preset size to obtain a tool holder simulation model includes: Obtain the axial cross-sectional view of the tool holder model; Identify the lines on the outer and inner surfaces in the axial cross-sectional view; Obtain the horizontal distance between the outer and inner surfaces in the axial cross-sectional view; Mark areas where the horizontal distance is greater than the preset thickness; Several model mounting holes are made in the area to obtain a tool holder simulation model.

[0036] The area where the horizontal distance of the marker is greater than the preset thickness includes: Identify the maximum length of all regions with a horizontal distance greater than the preset thickness; The region whose maximum length is greater than the preset length is displayed as the target region; Select the target area closest to the centerline of the smart tool holder to be processed as the area for opening the model mounting holes.

[0037] See Figure 1 Using the aforementioned directional control system, this embodiment also provides a machine tool reverse control method, including: Step 100: The strain sensor collects the deformation signal during the machining process of the intelligent tool holder.

[0038] Step 101: The processing chip determines whether the deformation signal exceeds the normal range. If so, proceed to step 102; otherwise, proceed to step 104.

[0039] Step 102: Transmit control signals to the machine tool receiver via Bluetooth transmitter.

[0040] Step 103: The machine tool receiving device transmits control signals to the CNC machine tool controller. After receiving the control signals, the machine tool receiving device pauses the machining action of the smart tool holder. The processing chip converts the deformation signal that exceeds the normal range into a digital signal and transmits it to the host computer through the Bluetooth transmitter. Then, step 105 is executed.

[0041] Step 104: The processing chip converts the deformation signal into a digital signal and then transmits it to the host computer via a Bluetooth transmitter.

[0042] Step 105: The host computer stores the received deformation signal.

[0043] Step 106: Determine whether the deformation signal exceeds the normal range. If yes, proceed to step 107; otherwise, end the process.

[0044] Step 107: The host computer issues a prompt through the output device.

[0045] See Figure 2 Step 103 includes the following process: Step 1031: After receiving the control signal, the machine tool receiving device pauses the machining operation of the smart tool holder; Step 1032: The processing chip sends a control signal for self-testing to the CNC machine tool; Step 1033: The CNC machine tool runs a self-test program and determines whether there is an abnormal operating state. If so, proceed to step 1034; otherwise, proceed to step 1035.

[0046] Step 1034: Provide a prompt, then end the process.

[0047] Step 1035: Use the automatic tool magazine to change the cutting tools of the smart tool holder.

[0048] Step 1036: Restart the CNC machine tool's machining operation from the last paused position; Step 1037: The strain sensor collects the deformation signal of the intelligent tool holder during the machining process.

[0049] Step 1038: The processing chip determines whether the deformation signal exceeds the normal range. If so, proceed to step 1039; otherwise, proceed to step 104.

[0050] Step 1039: After receiving the control signal, the machine tool receiving device stops the machining operation of the intelligent tool holder and notifies the host computer to issue a prompt.

[0051] Furthermore, this embodiment provides a method for manufacturing the aforementioned smart knife handle as follows: For a smart tool holder to be processed, obtain the tool holder model and material parameters of the smart tool holder to be processed; Several model mounting holes are made on the tool holder model according to a preset size to obtain the tool holder simulation model; Finite element simulation calculations were performed on the tool holder simulation model; Obtain the tool holder working parameters from the finite element simulation calculation; Determine whether the working parameters of the tool holder meet the preset requirements. If so, open the actual mounting holes on the smart tool holder to be processed according to the position of the model mounting holes in the tool holder simulation model. The strain sensor and the wireless communication device for transmitting the strain sensor's acquired signals are installed in the actual mounting hole.

[0052] The step of creating several model mounting holes on the tool holder model according to a preset size to obtain a tool holder simulation model includes: Obtain the axial cross-sectional view of the tool holder model; Identify the lines on the outer and inner surfaces in the axial cross-sectional view; Obtain the horizontal distance between the outer and inner surfaces in the axial cross-sectional view; Mark areas where the horizontal distance is greater than the preset thickness; Several model mounting holes are made in the area to obtain a tool holder simulation model.

[0053] Furthermore, the area where the horizontal distance of the marker is greater than the preset thickness includes: Identify the maximum length of all regions with a horizontal distance greater than the preset thickness; The region whose maximum length is greater than the preset length is displayed as the target region; Select the target area closest to the centerline of the smart tool holder to be processed as the area for opening the model mounting holes.

[0054] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A machine tool reverse control method based on cutting force detection, used in CNC machine tools, characterized in that, The CNC machine tool includes at least one intelligent tool holder, which has several mounting holes. A flexible circuit board is disposed within each mounting hole, and a strain sensor and a processing chip are mounted on the flexible circuit board. The machine tool reverse control method includes: Strain sensors collect deformation signals during the machining process of the intelligent tool holder; The processing chip determines whether the deformation signal exceeds the normal range. If so, it transmits a control signal to the machine tool receiving device via a Bluetooth transmitter; otherwise, it transmits the deformation signal to the host computer via a Bluetooth transmitter. After receiving the control signal, the machine tool receiving device pauses the machining operation of the smart tool holder and transmits the deformation signal that exceeds the normal range to the host computer. The host computer stores the received deformation signals; The manufacturing method of the intelligent knife handle is as follows: For a smart tool holder to be processed, obtain the tool holder model and material parameters of the smart tool holder to be processed; Several model mounting holes are made on the tool holder model according to a preset size to obtain the tool holder simulation model; Finite element simulation calculations were performed on the tool holder simulation model; Obtain the tool holder working parameters from the finite element simulation calculation; Determine whether the working parameters of the tool holder meet the preset requirements. If so, open the actual mounting holes on the smart tool holder to be processed according to the position of the model mounting holes in the tool holder simulation model. The strain sensor and the wireless communication device for transmitting the strain sensor's acquired signals are installed in the actual mounting holes. The process of creating several model mounting holes on the tool holder model according to a preset size to obtain a tool holder simulation model includes: Obtain the axial cross-sectional view of the tool holder model; Identify the lines on the outer and inner surfaces in the axial cross-sectional view; Obtain the horizontal distance between the outer and inner surfaces in the axial cross-sectional view; Mark areas where the horizontal distance is greater than the preset thickness; Several model mounting holes are made in the area to obtain a tool holder simulation model; The area where the horizontal distance of the marker is greater than the preset thickness includes: Identify the maximum length of all regions with a horizontal distance greater than the preset thickness; The region whose maximum length is greater than the preset length is displayed as the target region; Select the target area closest to the centerline of the smart tool holder to be processed as the area for opening the model mounting holes.

2. The machine tool reverse control method as described in claim 1, characterized in that, The host computer stores the received deformation signals, including: The host computer stores the received deformation signals; Determine if the deformation signal exceeds the normal range; if so, issue a prompt.

3. The machine tool reverse control method as described in claim 1, characterized in that, The machine tool reverse control method includes: The processing chip determines whether the deformation signal exceeds the normal range. If so, the control signal is transmitted to the machine tool receiving device via Bluetooth. The machine tool receiving device then transmits the control signal to the CNC machine tool controller. The processing chip converts the deformation signal exceeding the normal range into a digital signal and transmits it to the host computer via Bluetooth. Otherwise, the processing chip converts the deformation signal into a digital signal and transmits it to the host computer via a Bluetooth transmitter.

4. The machine tool reverse control method as described in claim 1, characterized in that, After receiving the control signal, the machine tool receiving device pauses the machining operation of the smart tool holder, including: After receiving the control signal, the machine tool receiving device pauses the machining operation of the smart tool holder; The processing chip sends control signals for self-testing to the CNC machine tool; The CNC machine tool runs a self-test program and determines whether there is any abnormal operating state. If so, it will issue a prompt; otherwise, it will use the automatic tool magazine to replace the tool with the intelligent tool holder.

5. The machine tool reverse control method as described in claim 4, characterized in that, The tool after changing the smart tool holder using the automatic tool magazine includes: Restart the CNC machine tool's machining operation from the last paused position; Strain sensors collect deformation signals during the machining process of the intelligent tool holder; The processing chip determines whether the deformation signal exceeds the normal range. If so, it transmits a control signal to the machine tool receiving device via a Bluetooth transmitter. After receiving the control signal, the machine tool receiving device stops the machining operation of the intelligent tool holder and notifies the host computer to issue a prompt.

6. A machine tool reverse control system based on cutting force detection, characterized in that, The machine tool reverse control system is used to implement the machine tool reverse control method as described in any one of claims 1 to 5 for production.

7. A CNC machine tool, characterized in that, The CNC machine tool is used to implement the machine tool reverse control method as described in any one of claims 1 to 5 for production.

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