Cutter detection device of numerical control machine tool

Abstract

The cutter detection device comprises a power supply, a cutter detection device, a cutter detection device and a cutter detection device, the positive electrode of the power supply is connected with a main shaft of the numerically-controlled machine tool, and the negative electrode of the power supply is connected with a working table of the numerically-controlled machine tool; the acquisition module is used for acquiring a first electric signal in a passage formed by a target cutter and a target workpiece when the main shaft controls the target cutter to machine the target workpiece, the target cutter is mounted on the main shaft, and the target workpiece is placed on the working table; the processor is used for obtaining a detection result of the target cutter according to the first electric signal. The target tool and the target workpiece form the path through the power supply, the detection result of the target tool is obtained through the processor according to the first electric signal on the path, the first electric signal can be continuously obtained in the machining process, meanwhile, the target tool is continuously detected, and real-time detection is conducted while the target tool conducts machining.

Description

Technical Field

[0001] The utility model relates to the technical field related to tool detection of numerically controlled machine tools, and in particular to a tool detection device for numerically controlled machine tools. Background Art

[0002] CNC machine tools control cutting tools to perform processing processes such as splitting and drilling on workpieces. During the processing, due to the small diameter and low rigidity of the cutting tools, they are prone to breakage and wear, which has a significant impact on the processing accuracy and surface quality. Therefore, it is necessary to use a tool setter to detect the cutting tools on the machine. Traditional tool detection devices mainly include non-contact laser tool setters and contact tool setters. However, the above tool setters all have a feature that the CNC machine tool needs to move the detection tool to the tool setting device position before the detection can begin. This method cannot detect the cutting tool during the processing process. Utility Model Content

[0003] In order to solve the above problems, the example of the present application provides a tool detection device for a CNC machine tool. The solution of the present application is used to realize real-time detection of the tool during the machining process.

[0004] To achieve the above-mentioned objectives, in first aspect, an embodiment of the present application provides a tool detection device for a CNC machine tool, comprising: a power supply, wherein the positive pole of the power supply is connected to the spindle of the CNC machine tool, and the negative pole of the power supply is connected to the work table of the CNC machine tool; an acquisition module, for acquiring a first electrical signal in a path formed by a target tool and a target workpiece when the spindle controls a target tool to process a target workpiece, the target tool being mounted on the spindle, and the target workpiece being placed on the work table; and a processor, for obtaining a detection result of the target tool according to the first electrical signal.

[0005] It can be seen that in the embodiment of the present application, a voltage is applied to a path formed when the target tool and the target workpiece are in contact by a power supply, and at the same time, the processor obtains the detection result of the target tool according to the first electrical signal obtained by the acquisition module on the path, and determines whether the target tool has a fault. This realizes real-time fault detection of the target tool during the machining process.

[0006] In combination with the first aspect, in a possible embodiment, the device also includes a carbon brush sensor, the carbon brush sensor includes: a carbon brush sensor body, a feed air inlet and a feed pipe; the carbon brush sensor body, the carbon brush sensor body is connected to the positive pole of the power supply, the carbon block enters the feed pipe through the feed air inlet, and is sent to the carbon brush sensor body through the feed pipe, so that the positive pole of the power supply is connected to the main shaft through the carbon brush sensor body.

[0007] It can be seen that in the embodiment of the present application, the tool detection device is connected to the spindle of the CNC machine tool through a carbon brush sensor, which avoids the problem that the electrical signal obtained by the tool detection device directly connected to the spindle is not accurate when the spindle moves, rotates, etc. during the machining process, thereby improving the detection accuracy of the tool detection device.

[0008] In combination with the first aspect, in a possible embodiment, the CNC machine tool also includes a cutting fluid nozzle, which is used to spray cutting fluid onto the target tool; the acquisition module is also used to collect a second electrical signal in a passage formed by the target tool, the cutting fluid on the target tool and the target workpiece, and the acquisition time of the second electrical signal is before the acquisition time of the first electrical signal; the processor is also used to determine whether there is a blockage fault in the cutting fluid nozzle based on the second electrical signal.

[0009] It can be seen that in the embodiment of the present application, the second electrical signal is used to determine whether the cutting fluid nozzle of the CNC machine tool has a blockage fault, and then the corresponding maintenance operation is performed when the cutting fluid nozzle has a blockage fault. When the cutting fluid nozzle does not have a blockage fault, the subsequent target tool detection steps are executed, thereby ensuring the normal spraying of the cutting fluid, reducing the wear of the target tool, and improving the stability of the CNC machine tool.

[0010] In combination with the first aspect, in a possible embodiment, the device further includes: a communication module, configured to send the first electrical signal and the detection result to the CNC machine tool.

[0011] It can be seen that in the embodiment of the present application, through the communication module, the tool detection device can send the first electrical signal and the detection result to the terminal device of the CNC machine tool or the processing personnel. When there is a fault in the target tool, the CNC machine tool or the processing personnel can take relevant maintenance measures for the fault to eliminate the fault of the target tool, which is beneficial to ensure the processing efficiency and processing stability of the CNC machine tool.

[0012] In combination with the first aspect, in a possible embodiment, the device further includes: a display screen, configured to display the first electrical signal and the detection result.

[0013] In combination with the first aspect, in a possible embodiment, the output voltage of the power supply is 0-24V, and the output current is 0-3mA.

[0014] These and other aspects of the present application will become more clearly understood in the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the structure of a tool detection device provided in an embodiment of the present application;

[0017] Figure 2 A schematic diagram of the internal structure of a tool detection device provided in an embodiment of the present application;

[0018] Figure 3 A schematic diagram of the structure of another tool detection device provided in an embodiment of the present application;

[0019] Figure 4A A structural schematic diagram of a carbon brush sensor body provided in an embodiment of the present application;

[0020] Figure 4B A schematic diagram of the structure of the feed inlet provided in the embodiment of the present application;

[0021] Figure 5 A schematic diagram of the structure of another tool detection device provided in an embodiment of the present application;

[0022] Figure 6 A waveform diagram of a first electrical signal provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0025] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] The embodiments of the present application are described below in conjunction with the accompanying drawings.

[0027] See also Figure 1 , Figure 1 A schematic diagram of the structure of a tool detection device provided in an embodiment of the present application is shown in the figure. The tool detection device 100 includes: a positive power supply electrode 101, a negative power supply electrode 102, a display screen 103, a control button 104, and multiple expansion interfaces 105. The positive power supply electrode 101 is connected to the spindle 1001 of the CNC machine tool 1000, and the negative power supply electrode 102 is connected to the work surface 1004 of the CNC machine tool 1000. Therefore, when the target tool 1002 controlled by the spindle 1001 processes the target workpiece 1003 on the work surface 1004, the target tool 1002 and the target workpiece 1003 will come into contact, and at this time, the positive power supply electrode 101, the spindle 1001, the target tool 1002, the target workpiece 1003, the work surface 1004, and the negative power supply electrode 102 will form a path. Therefore, the acquisition module in the tool detection device 100 can obtain the first electrical signal in the path, and thus obtain the detection result of the target tool 1002 according to the first electrical signal. The first electrical signal here is specifically one of current, voltage, and resistance. The tool detection device 100 specifically determines whether the target tool is in a normal working state and whether there is a fault such as tool wear or tool breakage by comparing the difference between the first electrical signal and the electrical signal in a normal working state without a fault.

[0028] The specific first electrical signal, the detection result, etc. can be displayed on the display screen 103. The tool detection device 100 also includes a plurality of control buttons 104. Figure 1 Only four control buttons 104 are shown in the figure. In actual applications, more or fewer control buttons 104 may be included. The control buttons 104 can be used to adjust the output voltage and current, control the start or shutdown of the tool detection device 100, and switch the display content of the display screen 103, etc.

[0029] The multiple expansion interfaces 105 are used to connect expansion devices. The expansion devices here include devices that need to be connected to the tool detection device 100 and devices that need to be connected to the CNC machine tool 1000. After the CNC machine tool 1000 is connected to the tool detection device 100, the CNC machine tool 1000 may be unable to connect to the expansion devices because the tool detection device 100 occupies an interface of the CNC machine tool 1000. At this time, it can be connected to the tool detection device 100 through multiple expansion interfaces 105, and then connected to the CNC machine tool 1000 through the tool detection device 100. The multiple expansion interfaces include encoder interfaces, power supply interfaces, data connections, communication interfaces, etc., which can specifically connect external power supplies, encoders, various sensors, etc.

[0030] See also Figure 2 , Figure 2 This is a schematic diagram of the internal structure of a tool detection device provided in an embodiment of the present application, wherein the tool detection device 200 includes a processor 201, a communication module 202, a power supply 203, a collection module 204 and a memory 205.

[0031] The processor 201 is specifically an ARM CortexTM-M3, 32-bit processor with a maximum operating frequency of 144MHz. It is used to execute a related program for obtaining a detection result of a target tool according to the first electrical signal, specifically including comparing the difference between the first electrical signal and an electrical signal in a normal working state without a fault. The above-mentioned related program is stored in the memory 205 in the form of application code.

[0032] The communication module 202 is used to connect the CNC machine tool and the CNC airport through the communication interface for communication and data transmission, and is also used for communication and data transmission with expansion equipment.

[0033] The power supply 203 is used to Figure 1 The positive power electrode 101 and the negative power electrode 102 shown in the figure form a path between the target tool and the target workpiece.

[0034] The acquisition module 204 is used to acquire the electrical signal in the path formed by the target tool and the target workpiece, and the specific electrical signal is one of voltage, current or resistance.

[0035] It can be seen that in the embodiment of the present application, a pathway is formed between the target tool and the target workpiece through a power supply, and the detection result of the target tool is obtained according to the first electrical signal on the pathway through the processor. The target tool can be continuously detected by continuously acquiring the first electrical signal during the machining process, thereby realizing real-time detection of the tool during the machining process.

[0036] In a possible embodiment, the device also includes a carbon brush sensor, which includes: a carbon brush sensor body, a feed air inlet and a feed pipe; the carbon brush sensor body, the carbon brush sensor body is connected to the positive pole of the power supply, the carbon block enters the feed pipe through the feed air inlet, and is sent to the carbon brush sensor body through the feed pipe, so that the positive pole of the power supply is connected to the main shaft through the carbon brush sensor body.

[0037] Specifically, since the target tool needs to be moved, change angle, height, processing posture, etc. through the spindle during processing, if the wire is directly connected to the spindle, it may result in the failure to collect the first electrical signal or the collected first electrical signal is inaccurate. Therefore, in the embodiment of the present application, the tool detection device also includes a carbon brush sensor. Figure 3 , Figure 3 A schematic diagram of the structure of another tool detection device provided in an embodiment of the present application, Figure 1 On the basis of Figure 3 The tool detection device 100 further includes a carbon brush sensor body 301 , a feeding pipe 302 and a feeding air inlet 303 .

[0038] The carbon brush sensor body 301 is fixed on the CNC machine tool through a fixing frame 304, one end of which is aligned with the main shaft of the CNC machine tool, and the other end is connected to the feed pipe 302, and the other end of the feed pipe 302 is also connected to the feed air inlet 303. The feed air inlet 303 continuously feeds the carbon block into the feed pipe 302 through the air source, and the feed pipe 302 continuously feeds the carbon block into the carbon brush sensor body 301. Figure 3 It can be seen that the carbon brush sensor body 301 is relatively close to the spindle 1001 and is connected to the spindle through a carbon block. When the carbon block is worn due to movement or rotation of the spindle, the carbon brush sensor immediately outputs the next carbon block from the nozzle, thereby keeping the target tool and the carbon brush sensor body in a continuous conduction state. The positive pole of the power supply is connected to the metal shell of the carbon brush sensor body near the nozzle through a wire to achieve conduction among the positive pole of the power supply, the carbon brush sensor, the carbon block and the spindle.

[0039] See also Figure 4A , Figure 4AA structural schematic diagram of a carbon brush sensor body provided in an embodiment of the present application, wherein the carbon brush sensor body outputs the carbon block transmitted from the feed pipe from the nozzle to contact the main shaft, and the carbon brush sensor body is fixed on the main shaft through a fixing frame and maintains a certain distance from the main shaft. When the carbon block contacting the main shaft is worn due to the rotation, movement, etc. of the main shaft, a new carbon block is output from the nozzle, so that the carbon brush sensor body can continue to maintain conduction with the main shaft through the carbon block. The carbon brush sensor is connected to the feed pipe through a connecting device, so as to continuously obtain the carbon block transmitted during the feeding. The tool detection device can be connected to the wire of the metal shell near the nozzle through the positive pole of the power supply, and then obtain the electrical signal at the target tool and the target workpiece path.

[0040] The feeding pipe is used to transfer the carbon block continuously input by the air pump from the feed inlet to the carbon brush sensor body, and the carbon brush sensor body sends the carbon block to the spindle, so that the target tool and the spindle are continuously in a conductive state. In addition, the feeding pipe is a flexible hose that is bent and deformed at a specific position.

[0041] See also Figure 4B , Figure 4B A structural schematic diagram of a feed air inlet provided in an embodiment of the present application, which includes a feed air inlet main body connected to an air pump and for obtaining carbon blocks. The feed air inlet inputs the obtained carbon blocks into a pushing mechanism through the air pump, which specifically continuously feeds the carbon blocks into a feeding pipe through spring pushing or pneumatic pushing, and pushes the carbon blocks toward the carbon brush sensor main body.

[0042] It can be seen that in the embodiment of the present application, the tool detection device is connected to the spindle of the CNC machine tool through a carbon brush sensor, which avoids the problem that the electrical signal obtained by the tool detection device directly connected to the spindle is not accurate when the spindle moves, rotates, etc. during the machining process, thereby improving the detection accuracy of the tool detection device.

[0043] In a possible embodiment, the CNC machine tool also includes a cutting fluid nozzle, which is used to spray cutting fluid onto the target tool; the acquisition module is also used to collect a second electrical signal in a path formed by the target tool, the cutting fluid on the target tool and the target workpiece, and the acquisition time of the second electrical signal is before the acquisition time of the first electrical signal; the processor is also used to determine whether there is a blockage fault in the cutting fluid nozzle based on the second electrical signal.

[0044] Specifically, the CNC machine tool also includes a cutting fluid nozzle for spraying cutting fluid onto the target tool. The cutting fluid here is an industrial liquid used to cool and lubricate the target tool and the target workpiece during the process of the target tool processing the target workpiece, and needs to be continuously sprayed during the processing. Before obtaining the first electrical signal, the tool detection device also needs to obtain the second electrical signal, and then determine whether the target tool is sprayed with cutting fluid based on the second electrical signal.

[0045] For example, see Figure 5 , Figure 5 A schematic diagram of the structure of another tool detection device provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, Figure 5 The CNC machine tool 1000 further includes a cutting fluid nozzle 1005, where the cutting fluid nozzle 1005 can be as shown in FIG. Figure 5 As shown, it is placed near the target tool 1002, and can also be fixed on the spindle or other Figure 5 Locations not shown in .

[0046] Before the target tool processes the target workpiece, the cutting fluid nozzle 1005 needs to be blocked by the tool detection device 100. When the target tool 1002 is about to contact the target workpiece 1003, the distance between the target tool 1002 and the target workpiece 1003 is less than a preset distance, such as 1 mm, 0.5 mm, etc., and the tool detection device 100 can detect the second electrical signal in the path formed by the target tool 1002, the cutting fluid on the target tool 1002 and the target workpiece 1003.

[0047] If the cutting fluid nozzle 1005 is conductive, the target tool 1002 is stained with cutting fluid at this time. Since the cutting fluid is also conductive, a path is formed between the target tool 1002, the cutting fluid on the target tool, and the target workpiece 1003. If the cutting fluid nozzle is blocked, there is no cutting fluid on the target tool 1002, and the above path cannot be formed at this time. Therefore, it can be determined whether the cutting fluid nozzle 1005 is blocked according to the second signal.

[0048] It can be seen that in the embodiment of the present application, the second electrical signal is used to determine whether the cutting fluid nozzle of the CNC machine tool has a blockage fault, and then the corresponding maintenance operation is performed when the cutting fluid nozzle has a blockage fault. When the cutting fluid nozzle does not have a blockage fault, the subsequent target tool detection steps are executed, thereby ensuring the normal spraying of the cutting fluid, reducing the wear of the target tool, and improving the stability of the CNC machine tool.

[0049] In a possible embodiment, the device further includes: a communication module, configured to send the first electrical signal and the detection result to a numerically controlled machine tool.

[0050] Specifically, the tool detection device communicates with the CNC machine tool through the communication module here, and the connection method is wireless or wired, and the communication is based on the transmission control protocol TCP and other protocols. The CNC machine tool can implement fault detection and other measures based on the detection results sent by the tool detection device and the first electrical signal and other data.

[0051] The communication module can also forward the information sent by the expansion device connected to the tool detection device to the CNC machine tool, or send the first electrical signal and the detection result to the processing personnel of the CNC machine tool, thereby prompting the processing personnel that the target tool of the CNC machine tool has a fault.

[0052] It can be seen that in the embodiment of the present application, through the communication module, the tool detection device can send the first electrical signal and the detection result to the terminal device of the CNC machine tool or the processing personnel. When there is a fault in the target tool, the CNC machine tool or the processing personnel can take relevant maintenance measures for the fault to eliminate the fault of the target tool, which is beneficial to ensure the processing efficiency and processing stability of the CNC machine tool.

[0053] In a possible embodiment, the device further includes: a display screen, configured to display the first electrical signal and the detection result.

[0054] Specifically, the display screen here is one of a liquid crystal display screen LCD, an organic light emitting diode OLED display screen, and a semiconductor light emitting diode LED display screen. The display is used to display the first electrical signal and the detection result.

[0055] For example, see Figure 6 , Figure 6 A waveform diagram of a first electrical signal provided in an embodiment of the present application. The diagram can be directly displayed on a display screen. The first electrical signal includes electrical signals collected at multiple times, and the electrical signals collected at multiple times are connected to form Figure 6 From the waveform diagram shown, it can be seen that the waveforms when the target tool contacts the target workpiece in different time periods have similar characteristics. Figure 6 By comparing the waveform shown with the normal waveform of the target tool processing the target workpiece without any fault, it is possible to determine whether the target tool has a fault. That is, when the difference between the waveform of the target tool and the normal waveform is less than the preset difference, the target tool has no fault.

[0056] In a possible embodiment, the output voltage of the power supply is 0-24V, and the output current is 0-3mA.

[0057] Specifically, the output voltage of the tool detection device is 0-24V, and the output current is 0-3mA, that is, the maximum voltage in the path formed by the target tool and the target workpiece is 24V, and the maximum current is 3mA.

[0058] By implementing the method in the above embodiment, it can be seen that the processor generates the detection result of the target tool according to the first electrical signal, and realizes the real-time fault detection of the target tool. The detection accuracy of the tool detection device is improved by the carbon brush sensor. The second electrical signal is used to determine whether the cutting fluid nozzle of the CNC machine tool is blocked, which ensures the normal spraying of the cutting fluid, reduces the wear of the target tool, and improves the stability of the CNC machine tool. Through the communication module, it communicates with the CNC machine tool and other equipment, and then after the target tool fails, the processing personnel or the CNC machine tool takes relevant maintenance measures for the target tool failure to eliminate the target tool failure, which is conducive to ensuring the processing efficiency and processing stability of the CNC machine tool.

[0059] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A tool detection device for a CNC machine tool, characterized in that: include: A power supply, wherein the positive electrode of the power supply is connected to the spindle of the CNC machine tool, and the negative electrode of the power supply is connected to the working table of the CNC machine tool; an acquisition module, used for acquiring a first electrical signal in a path formed by the target tool and the target workpiece when the spindle controls the target tool to process the target workpiece, the target tool being mounted on the spindle and the target workpiece being placed on the worktable; A processor is used to obtain a detection result of the target tool according to the first electrical signal.

2. The device according to claim 1, characterized in that The device also includes a carbon brush sensor, which includes: a carbon brush sensor body, a feed air inlet and a feed pipe; A carbon brush sensor body, wherein the carbon brush sensor body is connected to the positive electrode of the power supply, and the carbon block enters the feed pipe through the feed inlet and is sent to the carbon brush sensor body through the feed pipe, so that the positive electrode of the power supply is connected to the main shaft through the carbon brush sensor body.

3. The device according to claim 1 or 2, characterized in that: The CNC machine tool further comprises a cutting fluid nozzle, and the cutting fluid nozzle is used to spray cutting fluid onto the target tool; The acquisition module is further used to acquire a second electrical signal in a path formed by the target tool, the cutting fluid on the target tool and the target workpiece, wherein the acquisition time of the second electrical signal is before the acquisition time of the first electrical signal; The processor is further configured to determine whether the cutting fluid nozzle has a blockage fault according to the second electrical signal.

4. The device according to claim 1, characterized in that The device also includes: A communication module is used to send the first electrical signal and the detection result to the CNC machine tool.

5. The device according to claim 1, characterized in that The device also includes: A display screen is used to display the first electrical signal and the detection result.

6. The device according to claim 1, characterized in that The output voltage of the power supply is 0-24V, and the output current is 0-3mA.

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