Numerical control machine tool cutter wear self-compensation clamping device

Abstract

The utility model provides a numerical control machine tool cutter wear self-compensation clamping device which comprises a shell, the shell comprises a clamping part and a connecting part arranged at the tail end of the clamping part, the front end of the clamping part is open, a mounting space is formed in the clamping part, and the connecting part is used for being connected with a machine tool spindle; the clamping mechanism is installed in the clamping space in a sliding mode, the sliding direction is in the axis direction of the shell, and the clamping mechanism is used for clamping the cutter; the detection mechanism is mounted on the outer side wall of the clamping part, and the detection mechanism is used for detecting the abrasion loss of the cutter; and the compensation mechanism is arranged in the mounting space and connected to the end, close to the connecting part, of the clamping mechanism, the compensation mechanism is electrically connected with the detection mechanism, and the compensation mechanism is used for ejecting out the clamping mechanism according to the abrasion loss so that the clamping mechanism can stretch out of the opening. According to the device, the abrasion loss of the tool can be detected, and accurate compensation can be conducted on the tool according to the abrasion loss.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of tool production and processing, in particular to a numerical control machine tool tool wear self-compensation clamping device. BACKGROUND

[0002] As one of the core equipment of modern manufacturing industry, numerical control machine tools are widely used in various precision machining fields. In the machining process of numerical control machine tools, tool wear is an inevitable problem. With the wear of the tool, the machining precision and efficiency will gradually decrease, and in severe cases, it may even cause workpiece enclosure or machine tool damage. Therefore, compensating for tool wear has become the key to improving the machining precision of numerical control machine tools and prolonging the service life of tools.

[0003] Traditional tool compensation methods mainly rely on periodic manual inspection and manual adjustment, which is not only inefficient, but also difficult to ensure machining precision. In recent years, with the development of automatic control technology, some automatic tool wear compensation devices have been gradually proposed, such as compensation combined with electric or hydraulic mechanisms. However, the existing technical solutions still have the problems of complex structure and low compensation precision. CONTENT OF THE INVENTION

[0004] In view of the above-mentioned defects or shortcomings in the prior art, it is desirable to provide a numerical control machine tool tool wear self-compensation clamping device to solve the above-mentioned problems.

[0005] The present application provides a numerical control machine tool tool wear self-compensation clamping device, comprising:

[0006] A housing, the housing comprises a clamping portion and a connecting portion provided at the tail end of the clamping portion, the front end of the clamping portion is open and an installation space is provided inside, and the connecting portion is used to connect the main shaft of the machine tool;

[0007] A clamping mechanism, the clamping mechanism is slidingly installed in the clamping space, the sliding direction is along the axis direction of the housing, and the clamping structure is used to clamp the tool;

[0008] A detection mechanism, the detection mechanism is installed on the outer side wall of the clamping portion, and the detection mechanism is used to detect the wear amount of the tool;

[0009] A compensation mechanism, the compensation mechanism is provided in the installation space and connected to one end of the clamping mechanism close to the connecting portion, the compensation mechanism is electrically connected with the detection mechanism, and the compensation mechanism is used to eject the clamping mechanism according to the wear amount, so that the clamping mechanism extends out of the opening.

[0010] According to the technical scheme provided by the embodiment of the present application, the clamping mechanism comprises:

[0011] A plurality of cutter clamping blocks are arranged around the axis of the shell, and a cutter clamping space is formed between the plurality of cutter clamping blocks.

[0012] A plurality of clamping devices corresponding to the cutter clamping blocks are arranged between the clamping part and the cutter clamping block and are in sliding connection with the clamping part, and the sliding direction is along the axis direction of the shell. The clamping device includes a pair of telescopic rods, and the free end of the telescopic rod is connected to the cutter clamping block through a push plate.

[0013] According to the technical scheme provided by the embodiment of the application, the compensation mechanism comprises:

[0014] A guide column is arranged in the mounting space and abuts against one end of the cutter clamping block close to the connecting part.

[0015] A lifting member is sleeved on the guide column and is slidable along the axis direction of the shell, and a plurality of first wedge-shaped blocks are arranged on the side of the lifting member.

[0016] A plurality of second wedge-shaped blocks corresponding to the first wedge-shaped blocks are arranged and abut against the first wedge-shaped blocks.

[0017] A plurality of groups of piezoelectric ceramics are arranged on the inner wall of the clamping part, the piezoelectric ceramics are fixed with the second wedge-shaped blocks and are electrically connected with the detection mechanism, and the piezoelectric ceramics are deformed by electricity according to the wear amount to drive the second wedge-shaped blocks to slide the first wedge-shaped blocks.

[0018] According to the technical scheme provided by the embodiment of the application, the second wedge-shaped block is arranged on the side of the first wedge-shaped block away from the cutter clamping block, the top of the second wedge-shaped block is provided with a first inclined surface, the bottom of the first wedge-shaped block is provided with a second inclined surface corresponding to the first inclined surface, and the inclined angles of the first inclined surface and the second inclined surface are 5°-15°.

[0019] According to the technical scheme provided by the embodiment of the application, each group of piezoelectric ceramics includes a plurality of piezoelectric ceramic sheets arranged in a laminated manner.

[0020] According to the technical scheme provided by the embodiment of the application, the inside of the clamping part is provided with a plurality of guide parts arranged between two adjacent first wedge-shaped blocks.

[0021] According to the technical scheme provided by the embodiment of the application, the detection mechanism comprises:

[0022] An infrared sensor is used to detect the actual distance between the front end of the shell and the workpiece clamping tool on the machine tool.

[0023] A controller is electrically connected with the infrared sensor and the piezoelectric ceramic respectively, and is used for calculating the wear amount according to the difference between the actual distance and the set distance, and controlling the power supply of the piezoelectric ceramic.

[0024] According to the technical scheme provided in the embodiment of the application, the guide column is sleeved with a reset spring, one end of the reset spring is fixedly connected with the first wedge-shaped block, and the other end is fixedly connected with the bottom of the mounting space.

[0025] Compared with the prior art, the application has the beneficial effects that: the clamping mechanism is arranged to clamp the tool and install it on the spindle of the machine tool; the detection mechanism is arranged to detect the normal length of the tool, and the wear amount of the tool is calculated according to the normal length of the tool and the length of the tool after wear; the compensation mechanism is arranged to push the clamping mechanism to slide along the axis direction of the shell, so that the compensation mechanism can adjust the clamping mechanism to extend out of the shell after receiving the wear amount of the tool, to accurately compensate the tool wear according to the wear amount of the tool, thereby improving the machining efficiency of the numerical control machine tool. BRIEF DESCRIPTION OF DRAWINGS

[0026] Other features, objects, and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the drawings:

[0027] Figure 1 A front view of the numerical control machine tool tool wear self-compensation clamping device provided in the application is shown in the figure;

[0028] Figure 2 A front view of the numerical control machine tool tool wear self-compensation clamping device provided in the application is shown in the figure; Figure 1 A sectional view of the numerical control machine tool tool wear self-compensation clamping device in the A-A direction shown in the figure is shown in the figure;

[0029] Figure 3 A sectional view of the numerical control machine tool tool wear self-compensation clamping device in the B-B direction shown in the figure is shown in the figure; Figure 1 A sectional view of the numerical control machine tool tool wear self-compensation clamping device in the B-B direction shown in the figure is shown in the figure;

[0030] Figure 4 A front view of the numerical control machine tool tool wear self-compensation clamping device provided in the application is shown in the figure;

[0031] Figure 5 A front view of the numerical control machine tool tool wear self-compensation clamping device provided in the application is shown in the figure; Figure 2 A sectional view of the numerical control machine tool tool wear self-compensation clamping device in the C-C direction shown in the figure is shown in the figure.

[0032] The figure reference: 1, the shell; 2, the clamping part; 3, the connecting part; 4, the tool clamping block; 5, the clamping space; 6, the clamping device; 7, the telescopic rod; 8, the push plate; 9, the guide column; 10, the lifting piece; 11, the first wedge block; 12, the second wedge block; 13, the piezoelectric ceramic; 14, the guide part; 15, the infrared sensor; 16, the controller; 17, the reset spring; 18, the blocking part; 19, the slide rail. DETAILED DESCRIPTION

[0033] The application will be further described below in detail with reference to the drawings and examples. It can be understood that the specific examples described herein are only used to explain the related application, and not to limit the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for ease of description.

[0034] It should be noted that the examples in the present application and the features in the examples can be combined with each other without conflict. The application will be described in detail below with reference to the drawings and examples.

[0035] Please refer to Figures 1-5 The application provides a numerical control machine tool tool wear self-compensation clamping device, comprising:

[0036] The shell 1 comprises a clamping part 2 and a connecting part 3 arranged at the tail end of the clamping part 2, the front end of the clamping part 2 is open and an installation space is arranged inside, and the connecting part 3 is used for connecting the main shaft of the machine tool;

[0037] The clamping mechanism is slidably installed in the clamping space, the sliding direction is along the axis direction of the shell 1, and the clamping structure is used for clamping the tool;

[0038] The detection mechanism is installed on the outer side wall of the clamping part 2, and the detection mechanism is used for detecting the wear amount of the tool;

[0039] The compensation mechanism is arranged in the installation space and connected to one end of the clamping mechanism close to the connecting part 3, the compensation mechanism is electrically connected with the detection mechanism, and the compensation mechanism is used for ejecting the clamping mechanism according to the wear amount, so that the clamping mechanism is stretched out from the opening.

[0040] Specifically, the clamping device is used for clamping and installing a tool on a spindle of a machine tool, and comprises a housing 1, a clamping mechanism, a detection mechanism and a compensation mechanism. The housing 1 comprises a clamping portion 2 and a connecting portion 3 which is integrally formed with the clamping portion 2 and is used for mounting the housing 1 on the spindle of the machine tool. The clamping mechanism and the compensation mechanism are mounted in the clamping portion 2. The clamping mechanism is used for clamping and fixing the tool, and is in sliding connection with the inner wall of the clamping portion 2, so that the clamping mechanism can slide along the axis direction of the housing 1, thereby compensating for tool wear. The compensation mechanism is mounted at the end of the clamping mechanism away from the opening of the housing 1, and serves as a power source for tool compensation. The compensation mechanism can drive the clamping mechanism along the axis direction of the housing 1, so that the clamping mechanism can be pushed out of the opening of the clamping portion 2 by a certain distance according to the amount of tool wear, thereby compensating for the tool. The detection mechanism is mounted on the outer wall of the clamping portion 2, and is used for detecting the amount of tool wear by measuring the length of the tool, and then sending the amount of tool wear to the compensation mechanism. Through the cooperation of the clamping mechanism, the detection mechanism and the compensation mechanism, the clamping device can compensate for the tool according to the amount of tool wear, thereby improving the machining accuracy and efficiency of the numerical control machine tool.

[0041] Further, the clamping mechanism comprises:

[0042] A plurality of tool clamping blocks 4 are arranged around the axis of the housing 1, and a tool clamping space 5 is formed between the tool clamping blocks 4.

[0043] A plurality of clamping devices 6 correspond to the tool clamping blocks 4 one by one. The clamping devices 6 are arranged between the clamping portion 2 and the tool clamping blocks 4 and are in sliding connection with the clamping portion 2. The sliding direction is along the axis direction of the housing 1. The clamping device 6 comprises a pair of telescopic rods 7. The free ends of the telescopic rods 7 are connected to the tool clamping blocks 4 through a push plate 8.

[0044] Specifically, as Figure 3 and Figure 5As shown, the clamping mechanism at least includes a plurality of tool clamping blocks 4 and a plurality of clamping devices 6, the clamping devices 6 are arranged one-to-one with the tool clamping blocks 4, in this embodiment, three tool clamping blocks 4 and clamping devices 6 are arranged, wherein the three tool clamping blocks 4 are arranged in a circumferential direction around the axis of the shell 1, the outer side of the three tool clamping blocks 4 is in a circular arc shape, and the three tool clamping blocks 4 are slidable in the radial direction of the shell 1, so that the clamping space 5 between the three tool clamping blocks 4 can be adjusted, and the tool can be fixed by installing the tool in the clamping space 5 and tightening the three tool clamping blocks 4. The clamping device 6 is also provided with three corresponding tool clamping blocks 4, each clamping device 6 is arranged between the corresponding tool clamping block 4 and the inner wall of the clamping part 2, one side of the clamping device 6 is installed on the inner wall of the clamping part 2 through the slide rail 19, and the clamping device 6 can slide along the slide rail 19 in the axial direction of the shell 1. The other side of the clamping device 6 is provided with two telescopic rods 7, the telescopic rods 7 can be extended and retracted in the radial direction of the shell 1, the free end of the telescopic rod 7 is fixedly installed with a push plate 8, one side of the push plate 8 is in a circular arc shape matched with the tool clamping block 4, and the push plate 8 is fixedly connected with the outer side of the tool clamping block 4. The clamping device 6 drives the tool clamping block 4 to move through the telescopic rod 7, thereby adjusting the size of the clamping space; optionally, the clamping device 6 is a pneumatic cylinder or an oil cylinder, or the telescopic rod 7 can be controlled by electricity. The front end of the tool clamping block 4 is also provided with a blocking part 18, the blocking part 18 extends out of the opening on the clamping part 2 and extends in the radial direction of the shell 1, and the blocking part 18 can block the opening position of the clamping part 2 to prevent metal chips generated during machining from entering the clamping device and affecting the work of the clamping device.

[0045] Further, the compensation mechanism comprises:

[0046] A guide column 9 is arranged in the mounting space and abuts against one end of the tool clamping block 4 close to the connecting part 3;

[0047] A lifting piece 10 is sleeved on the guide column 9 and can slide in the axial direction of the shell 1, and a plurality of first wedge blocks 11 are arranged on the side of the lifting piece 10;

[0048] A plurality of second wedge blocks 12 are arranged one-to-one with the first wedge blocks 11 and abut against the first wedge blocks 11;

[0049] A plurality of piezoelectric ceramics 13 are arranged on the inner wall of the clamping part 2, the piezoelectric ceramics 13 are fixed with the second wedge blocks 12 and are electrically connected with the detection mechanism, and the piezoelectric ceramics 13 are deformed by electricity according to the wear amount to drive the second wedge blocks 12 to push the first wedge blocks 11 to slide.

[0050] Specifically, as Figure 4And Figure 5 As shown in the drawings, the guide column 9 is arranged inside the clamping part 2 and is integrally formed with the clamping part 2. The guide column 9 is in a cylindrical shape and is coaxially arranged with the shell 1. The lifting piece 10 is sleeved on the end of the guide column 9. The lifting piece 10 and the guide column 9 are relatively slidable. The lifting piece 10 is supported by the guide column 9. The front end of the lifting piece 10 is slidingly connected with the push plate 8 and the tool clamping block 4, so as to facilitate the movement of the push plate 8 and the tool clamping block 4 along the radial direction of the shell 1. A plurality of first wedge blocks 11 are arranged on the outer side wall of the lifting piece 10 in a circumferential direction. A second wedge block 12 is arranged corresponding to each first wedge block 11. The second wedge block 12 is arranged on the outer circumferential side of the first wedge block 11. The second wedge block 12 and the first wedge block 11 are mutually abutted. The second wedge block 12 supports the first wedge block 11. The second wedge block 12 is mounted on the inner wall of the clamping part 2 through a piezoelectric ceramic 13. The number of the piezoelectric ceramic 13, the second wedge block 12 and the first wedge block 11 is the same. In this embodiment, the piezoelectric ceramic 13, the second wedge block 12 and the first wedge block 11 are all provided with six. The six piezoelectric ceramics 13 are uniformly arranged along the inner wall of the shell 1 in a circumferential direction. One second wedge block 12 is fixed on each piezoelectric ceramic 13. Each piezoelectric ceramic 13 is electrically connected with the detection mechanism. When the detection mechanism detects the wear of the tool, each piezoelectric ceramic 13 is powered on, so that the piezoelectric ceramic accurately deforms and elongates, thereby driving the second wedge block 12 to extrude the first wedge block 11 along the axis of the shell 1. Through the cooperation of the second wedge block 12 and the first wedge block 11, the extrusion along the radial direction of the shell 1 is converted into the extrusion along the axial direction of the shell 1, so as to realize the movement of the clamping mechanism along the axial direction of the shell 1.

[0051] Further, the second wedge block 12 is arranged on the side of the first wedge block 11 away from the tool clamping block 4. The top of the second wedge block 12 is provided with a first inclined surface. The bottom of the first wedge block 11 is provided with a second inclined surface corresponding to the first inclined surface. The angle between the first inclined surface and the second inclined surface is 5°-15°.

[0052] Specifically, the side of the bottom surface of the first wedge block 11 close to the second wedge block 12 is formed with a first inclined surface. The side of the top surface of the second wedge block 12 close to the first wedge block 11 is formed with a second inclined surface. The first inclined surface and the second inclined surface abut each other between the second wedge block 12 and the first wedge block 11. The angle between the first inclined surface and the second inclined surface and the radial direction of the shell 1 is between 5° and 15°. In this way, while the second wedge block 12 supports the first wedge block 11, the displacement of the first wedge block 11 along the axis of the shell 1 is increased under the condition that the displacement of the second wedge block 12 along the radial direction of the shell 1 is small, thereby increasing the supply amount. In this embodiment, the angle of the first inclined surface and the second inclined surface is 15°.

[0053] Further, each group of piezoelectric ceramics 13 comprises a plurality of piezoelectric ceramic sheets arranged in a stack.

[0054] Specifically, by arranging each group of piezoelectric ceramics 13 in a stack of a plurality of piezoelectric ceramic sheets, the deformation and stretching of the piezoelectric ceramics 13 when electrified can be increased, and the compensation mechanism can have a larger compensation amount.

[0055] Further, the inside of the clamping portion 2 is provided with a plurality of guide portions 14, which are arranged between two adjacent first wedge-shaped blocks 11.

[0056] Specifically, a plurality of guide portions 14 are formed on the inner side wall of the clamping portion 2, which are integrally formed with the clamping portion 2, extend along the axis direction of the housing 1, and are adapted to the shape of the first wedge-shaped block 11. By arranging the guide portions 14, the movement direction of the first wedge-shaped block 11 can be limited, ensuring that it can move along the axis direction of the housing 1 under the push of the second wedge-shaped block 12. In addition, the guide portions 14 can ensure the relative fixation between the compensation mechanism and the housing 1 when the clamping device is rotated by the main shaft of the machine tool, thereby reducing tool vibration.

[0057] Further, the detection mechanism comprises:

[0058] An infrared sensor 15 is arranged to detect the actual distance between the front end of the housing 1 and the workpiece clamping tool on the machine tool;

[0059] A controller 16 is electrically connected to the infrared sensor 15 and the piezoelectric ceramics 13, respectively, and is configured to calculate the wear amount according to the difference between the actual distance and the set distance, and control the electrification of the piezoelectric ceramics 13.

[0060] Specifically, the infrared sensor 15 is installed on the outer side wall of the clamping portion 2 near one end of the opening on the clamping portion 2. When the tool is installed on the clamping mechanism, the tool is abutted on the workpiece clamp of the machine tool. The actual distance between the blocking portion 18 and the workpiece clamp on the machine tool can be measured by the infrared sensor 15, and the wear amount can be calculated by the controller 16 according to the difference between the actual distance and the set distance. The set distance is the distance between the blocking portion 18 and the tool clamping tool on the machine tool measured by the infrared sensor 15 when the complete tool is installed on the clamping mechanism.

[0061] Further, the guide column 9 is provided with a reset spring 17, one end of which is fixedly connected to the first wedge-shaped block 11, and the other end is fixedly connected to the bottom of the mounting space.

[0062] Specifically, the reset spring 17 is used to reset the lifting piece 10. When the piezoelectric ceramic 13 is deformed by electricity and the second wedge block 12 pushes the first wedge block 11 to move, the reset spring 17 is stretched to store energy with the movement of the lifting piece 10. When the piezoelectric ceramic 13 is powered off, the second wedge block 12 resets with the contraction of the piezoelectric ceramic 13. At this time, the first wedge block 11 loses the support of the second wedge block 12, and then retreats to abut against the second wedge block 12 under the action of the reset spring 17, thereby resetting the clamping mechanism. By setting the reset spring 17, the clamping mechanism can be conveniently reset without the need to compensate the tool.

[0063] Working process: install the clamping device on the spindle of the machine tool, control the plurality of tool clamping blocks 4 to move away from each other through the plurality of clamping devices 6 to open the clamping space 5, then place the tool in the clamping space 5 and control the plurality of tool clamping blocks 4 to move close to each other to clamp and fix the tool; then operate the spindle of the machine tool to make the tool abut against the workpiece clamp on the machine tool, detect the actual distance between the blocking part 18 and the workpiece clamp through the infrared sensor 15, and calculate the wear amount by the difference between the actual distance and the set distance through the controller 16. The controller 16 controls the piezoelectric ceramic 13 to be powered on according to the wear amount; the piezoelectric ceramic 13 generates deformation after being powered on to stretch and drive the second wedge block 12 to move along the radial direction of the shell 1. The movement of the second wedge block 12 pushes the first wedge block 11 to move along the axis direction of the shell 1, thereby pushing the lifting piece 10 to push the clamping mechanism out of the opening on the clamping part 2 to realize compensation for the tool.

[0064] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.

Claims

1. A self-compensating clamping device for tool wear in a numerically controlled machine tool, characterized in that, The utility model provides a tool holder and compensation mechanism thereof, comprising: a housing (1) comprising a clamping portion (2) and a connecting portion (3) arranged at the tail end of the clamping portion (2), the clamping portion (2) being open at the front end and having an installation space inside, and the connecting portion (3) being used for connecting a machine tool spindle; a clamping mechanism slidably arranged in the installation space and used for clamping a tool, the sliding direction being along the axial direction of the housing (1); a detection mechanism arranged on the outer side wall of the clamping portion (2) and used for detecting the wear amount of the tool; a compensation mechanism arranged in the installation space and connected to one end of the clamping mechanism close to the connecting portion (3), the compensation mechanism being electrically connected to the detection mechanism, and the compensation mechanism being used for pushing out the clamping mechanism according to the wear amount so that the clamping mechanism extends out of the opening.

2. The numerically controlled machine tool wear self-compensating clamping device according to claim 1, characterized in that, The clamping mechanism comprises: a plurality of tool clamping blocks (4) arranged around the axis of the housing (1), and a tool clamping space (5) being formed between the tool clamping blocks (4); a plurality of clamping devices (6) corresponding to the tool clamping blocks (4), the clamping devices (6) being arranged between the clamping portion (2) and the tool clamping blocks (4) and being slidably connected to the clamping portion (2), the sliding direction being along the axial direction of the housing (1), and each clamping device (6) comprising a pair of telescopic rods (7), the free ends of the telescopic rods (7) being connected to the tool clamping blocks (4) through a push plate (8).

3. The CNC machine tool wear self-compensating clamping device according to claim 2, characterized in that, The compensation mechanism comprises: a guide column (9) arranged in the installation space and abutting against one end of the tool clamping blocks (4) close to the connecting portion (3); a lifting member (10) sleeved on the guide column (9) and being slidable along the axial direction of the housing (1), the lifting member (10) being provided with a plurality of first wedge-shaped blocks (11) on the side surface; a plurality of second wedge-shaped blocks (12) corresponding to the first wedge-shaped blocks (11) and abutting against the first wedge-shaped blocks (11); a plurality of groups of piezoelectric ceramics (13) arranged on the inner wall of the clamping portion (2), the piezoelectric ceramics (13) being fixed to the second wedge-shaped blocks (12) and being electrically connected to the detection mechanism, and the piezoelectric ceramics (13) being deformed by electricity according to the wear amount to drive the second wedge-shaped blocks (12) to push the first wedge-shaped blocks (11) to slide.

4. The numerically controlled machine tool wear self-compensating clamping device according to claim 3, characterized in that, The second wedge-shaped blocks (12) are arranged on the side of the first wedge-shaped blocks (11) away from the tool clamping blocks (4), the top of each second wedge-shaped block (12) is provided with a first inclined surface, the bottom of each first wedge-shaped block (11) is provided with a second inclined surface corresponding to the first inclined surface, and the inclined angles of the first inclined surface and the second inclined surface are 5°-15°.

5. The CNC machine tool wear self-compensating clamping device according to claim 4, characterized in that, Each group of piezoelectric ceramics (13) comprises a plurality of piezoelectric ceramic sheets arranged in a laminated manner.

6. A CNC machine tool wear self-compensating clamping device according to claim 5, characterized in that, The inside of the clamping part (2) is provided with a plurality of guide parts (14), which are arranged between two adjacent first wedge blocks (11).

7. A CNC machine tool wear self-compensating clamping device according to claim 6, characterized in that, The detection mechanism comprises: An infrared sensor (15) is arranged for detecting the actual distance between the front end of the shell (1) and the workpiece clamping tool on the machine tool; A controller (16) is electrically connected with the infrared sensor (15) and the piezoelectric ceramic (13) respectively, and is used for calculating the wear amount according to the difference between the actual distance and the set distance, and controlling the power supply of the piezoelectric ceramic (13).

8. A CNC machine tool wear self-compensating clamping device according to claim 7, characterized in that, A reset spring (17) is sleeved on the guide column (9), one end of the reset spring (17) is fixedly connected with the first wedge block (11), and the other end is fixedly connected with the bottom of the mounting space.

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