CNC high-precision external clamping system

Abstract

The utility model relates to the technical field of machining, in particular to a CNC (computer numerical control) high-precision external clamping system, which comprises a gap bridge plate fixedly arranged on a CNC machine tool working table, and is different from the prior art in that a zero-point positioning mounting plate is mounted on the gap bridge plate, and pneumatic zero-point positioning discs are mounted close to two ends of the zero-point positioning mounting plate respectively; the device further comprises a plurality of standard off-machine clamp plates, two zero-point positioning blind rivets matched with the zero-point positioning discs are installed on one face of each standard off-machine clamp plate, and the other face of each standard off-machine clamp plate is suitable for clamping a plurality of workpieces outside a machine. Compared with the prior art, the fixture has the advantages that the consistency of the position and the posture of the fixture on the fixture during each clamping can be ensured, the problem of poor repeated precision during external clamping is effectively avoided, and the machining precision is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical processing technical field, and specifically is a CNC high accuracy machine outer clamping system. BACKGROUND

[0002] In the modern mechanical processing field, CNC numerical control machine tool is the core equipment for realizing the precision machining of various metal and nonmetal parts, and its machining precision depends on the precision of the clamping link to a great extent. The clamping mode is mainly divided into machine inner clamping and machine outer clamping.

[0003] Machine inner clamping refers to the operation mode of clamping workpieces in the CNC numerical control machine tool. Specifically, when the machine tool is in the state of shutdown, the operator directly installs the workpiece on the fixture on the machine tool workbench and carries out positioning and clamping operation, and then the machine tool starts and begins to process the workpiece. The main defect of this clamping mode is low equipment utilization. Since the machine tool needs to be shut down for each clamping, the time of the machine tool in the non-processing state is greatly increased, which cannot continuously and efficiently operate, seriously affects the production efficiency, increases the processing cost, and is not conducive to large-scale and efficient production operation.

[0004] Machine outer clamping is to complete the clamping of the workpiece on the fixture outside the CNC numerical control machine tool, and then the fixture with the workpiece is installed on the machine tool for processing. Although this mode can effectively reduce the machine downtime and improve the equipment utilization, it also has many problems. The most prominent one is poor repeatability: the position and posture of the tooling on the fixture may vary slightly each time, and these differences will be amplified after multiple clamping, affecting the machining precision. In addition, the influence of tooling clamping force on tooling cannot be ignored, and improper clamping force may cause tooling deformation or workpiece displacement, further reducing the machining precision. At the same time, the waste iron chips generated during the processing process are easy to mix into the workpiece positioning area, interfere with the correct positioning of the workpiece, aggravate the problem of poor repeatability, and ultimately affect the processing quality.

[0005] In summary, both machine inner clamping and machine outer clamping have their own defects in actual application, which seriously restricts the improvement of CNC numerical control machine tool machining precision and production efficiency, and an optimized clamping solution is urgently needed to improve the current processing situation. INVENTION CONTENTS

[0006] In view of the above defects or one of the defects in the prior art, the utility model aims to improve the technology and expand the function, and provides a CNC high accuracy machine outer clamping system, and the technical scheme adopted is:

[0007] A CNC high-precision machine external clamping system, comprising a bridge plate fixed on the workbench surface of a CNC machine tool, wherein, different from the prior art, a zero-point positioning mounting plate is mounted on the bridge plate, and pneumatic zero-point positioning discs are mounted near both ends of the zero-point positioning mounting plate; further comprising a plurality of standard machine external fixture plates, one side of each of the standard machine external fixture plates is provided with two zero-point positioning pull pins respectively matched with the zero-point positioning discs, and the other side of the standard machine external fixture plate is adapted to clamp a plurality of workpieces outside the machine.

[0008] Further, the standard machine external fixture plates are replaced by compatible trays, one side of the compatible trays is provided with two zero-point positioning pull pins respectively matched with the zero-point positioning discs, and the other side of the compatible trays is provided with at least two ball lock receiving sleeves, one side of a plurality of non-standard machine external fixture plates of different specifications is provided with a ball lock matched with the ball lock receiving sleeves, and the other side of the non-standard machine external fixture plates is adapted to clamp a plurality of workpieces outside the machine.

[0009] Further, a pre-positioning pin is mounted near each end of the zero-point positioning mounting plate, and a pre-positioning hole matched with the pre-positioning pin is formed in the standard machine external fixture plate.

[0010] Further, a gas distribution pipe is fixed to the rear side of the zero-point positioning mounting plate, high-pressure air is introduced into the gas distribution pipe, and a plurality of air injection holes facing the workpieces are formed in the gas distribution pipe.

[0011] Further, a waste chip sweeper is mounted on the main shaft of the CNC machine tool.

[0012] Further, a buffer damping pad is arranged between the bridge plate and the zero-point positioning mounting plate, and the thickness of the buffer damping pad is between 3-5mm.

[0013] Further, a storage chip is arranged at one end of the standard machine external fixture plate, and a mechanical hand grabbing the standard machine external fixture plate is provided with a reading device reading the storage chip.

[0014] Further, a side positioning pull pin is arranged at one end of the standard machine external fixture plate, and a mechanical hand grabbing the standard machine external fixture plate is provided with a side positioning disc matched with the side positioning pull pin.

[0015] Further, a V-shaped groove is formed at one end of the standard machine external fixture plate, the side positioning pull pin is arranged in the middle of the groove bottom of the V-shaped groove, and a mechanical hand grabbing the standard machine external fixture plate is provided with a protruding block matched with the V-shaped groove.

[0016] Further, an air-cut weight-reducing groove is formed in the bottom of the standard machine external fixture plate, and the air-cut weight-reducing groove also serves as a handle.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. Ensuring repeat positioning accuracy. By installing a zero-point positioning mounting plate on the bridge plate and setting pneumatic zero-point positioning discs at both ends, and installing zero-point positioning pull pins on the standard fixture plate outside the machine, accurate positioning is achieved. This zero-point positioning system ensures the consistency of the position and attitude of the tool on the fixture every time it is clamped, effectively avoiding the problem of poor repeat accuracy in off-machine clamping, and ensuring machining accuracy.

[0019] 2. Reducing machine downtime. With off-machine clamping, the workpiece can be pre-clamped to the standard fixture plate outside the CNC machine. This avoids the need for the machine to stop and wait for each clamping when clamping inside the machine, allowing the machine to run continuously, effectively improving equipment utilization, suitable for large-scale production operations.

[0020] 3. Optimizing clamping force impact. The pneumatic zero-point positioning disc helps better control the tool clamping force. Reasonable positioning and clamping structure can reduce the problem of tool deformation or workpiece displacement caused by inappropriate clamping force, further ensuring machining accuracy.

[0021] 4. Improving production efficiency and quality. The improvement of equipment utilization and the guarantee of machining accuracy can significantly improve production efficiency, reduce machining cost, and improve product machining quality, effectively solving the defects of existing in-machine clamping and off-machine clamping methods. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The structure diagram of the zero-point positioning mounting plate and the zero-point positioning disc on the bridge plate of the utility model.

[0023] Figure 2 The structure diagram of the standard fixture plate of example 1.

[0024] Figure 3 The structure diagram of the standard fixture plate of example 1. Figure 2 The structure diagram from another perspective.

[0025] Figure 4 The structure diagram of the standard fixture plate of example 1 when installed on the zero-point positioning mounting plate.

[0026] Figure 5 The structure diagram of the non-standard fixture plate of example 2.

[0027] Figure 6 The structure diagram of the non-standard fixture plate of example 2. Figure 5 The structure diagram from another perspective.

[0028] Figure 7 The structure diagram of the non-standard fixture plate of example 2 when installed on the zero-point positioning mounting plate. Detailed Implementation

[0029] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 this utility model.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] Example 1, as Figures 1-4 As shown, a high-precision external clamping system for CNC machines includes a bridge plate 1 fixed on the worktable of a CNC machine tool, a zero-point positioning mounting plate 2 installed on the bridge plate 1, and pneumatic zero-point positioning disks 3 installed at both ends near the zero-point positioning mounting plate 2; it also includes multiple standard external clamping plates 4, each of which has two zero-point positioning rivets 5 installed on one side that are adapted to the zero-point positioning disks 3, and the other side of the standard external clamping plate 4 is suitable for clamping multiple workpieces externally.

[0033] The working principle of this embodiment is as follows:

[0034] External workpiece clamping stage

[0035] Workpieces are clamped on a standard external fixture plate: Outside the CNC machine tool, the operator clamps multiple workpieces on the other side of a standard external fixture plate 4. This process can be performed while the machine tool is processing other workpieces, making full use of time and improving production efficiency.

[0036] Connection of standard off-machine clamp plate with zero-point positioning pull pins: One side of each standard off-machine clamp plate 4 is equipped with two zero-point positioning pull pins 5. These pull pins are key components for subsequent precise positioning and connection with the machine tool.

[0037] Connection stage of standard off-machine clamp plate with machine tool

[0038] Function of zero-point positioning disc: A bridge plate 1 is fixed on the worktable surface of the CNC machine tool, and a zero-point positioning mounting plate 2 is installed on the bridge plate 1. At both ends of the zero-point positioning mounting plate 2, a pneumatic zero-point positioning disc 3 is installed. When the standard off-machine clamp plate 4 with workpieces needs to be installed on the machine tool, the zero-point positioning disc 3 is controlled pneumatically to be in a connectable state.

[0039] Precise positioning and connection: The zero-point positioning pull pins 5 on the standard off-machine clamp plate 4 are connected with the zero-point positioning disc 3. The zero-point positioning system ensures high-precision positioning of the position and attitude of the standard off-machine clamp plate 4 on the machine tool worktable, ensuring the repeatability and accuracy of each clamping. This precise positioning can effectively avoid the problem of machining accuracy caused by inaccurate clamping position.

[0040] Processing stage

[0041] Machine tool starts processing: Once the standard off-machine clamp plate 4 is accurately installed on the machine tool through the zero-point positioning system, the machine tool can start processing the workpieces clamped on the standard off-machine clamp plate 4. During the processing, due to the previous precise positioning and reasonable clamping, the machining accuracy can be effectively guaranteed.

[0042] Stage of removing processed workpieces and replacing clamp plates

[0043] Removing workpieces after processing: After the workpieces are processed, the zero-point positioning disc 3 is controlled pneumatically to loosen the connection with the zero-point positioning pull pins 5, and the manipulator can conveniently remove the standard off-machine clamp plate 4 with processed workpieces from the machine tool.

[0044] After removing the processed workpieces, a new standard off-machine clamp plate 4 with workpieces can be installed on the machine tool according to the above steps for processing, realizing continuous and efficient production cycles.

[0045] Example 2, as Figure 1 , 5A CNC high-precision machine external clamping system is shown in FIG. 7, which includes a bridge plate 1 fixed on the workbench surface of a CNC numerical control machine tool, a zero-point positioning mounting plate 2 installed on the bridge plate 1, and pneumatic zero-point positioning discs 3 installed near the two ends of the zero-point positioning mounting plate 2. The system also includes a compatible tray 8, one side of which is installed with two zero-point positioning pull pins 5 respectively matched with the zero-point positioning discs 3, and the other side of which is installed with three ball lock receiving sleeves 9. One side of a plurality of non-standard machine external fixture plates is installed with ball locks respectively matched with the ball lock receiving sleeves 9, and the other side of the non-standard machine external fixture plates is adapted to clamp a plurality of workpieces outside the machine.

[0046] The working principle of the embodiment is as follows:

[0047] Machine external preparation stage

[0048] Non-standard machine external fixture plate clamping workpiece: outside the CNC numerical control machine tool, the operator selects the corresponding non-standard machine external fixture plate according to the special shape, size or process requirement of the workpiece to be processed. A plurality of workpieces are accurately clamped on the other side of the non-standard machine external fixture plate, which is customized for specific workpieces or processes, and can better meet the diversified processing needs.

[0049] Non-standard machine external fixture plate and compatible tray connection: one side of each non-standard machine external fixture plate is installed with a ball lock matched with the ball lock receiving sleeve 9 on the compatible tray 8. Through the cooperation of the ball lock and the ball lock receiving sleeve 9, the non-standard machine external fixture plate with workpieces is firmly connected to the compatible tray 8. This connection method is convenient and quick, and can ensure a certain connection accuracy, preparing for subsequent docking with the machine tool.

[0050] Compatible tray and machine tool connection stage

[0051] Zero-point positioning disc preparation: on the workbench surface of the CNC numerical control machine tool, the bridge plate 1 provides stable support for the entire system, and the zero-point positioning mounting plate 2 installed thereon is installed with pneumatic zero-point positioning discs 3 near the two ends. Before connecting the compatible tray 8 to the machine tool, the pneumatic control is used to make the zero-point positioning discs 3 in a state convenient for connection.

[0052] Precise docking: one side of the compatible tray 8 is installed with two zero-point positioning pull pins 5, which are accurately matched with the zero-point positioning discs 3. The compatible tray 8 connected with the non-standard machine external fixture plate is placed close to the machine tool, so that the zero-point positioning pull pins 5 are tightly matched with the zero-point positioning discs 3. By using the high-precision characteristics of the zero-point positioning system, the accurate positioning of the compatible tray 8 on the machine tool workbench is realized, ensuring the accuracy of its position and attitude, and laying a solid foundation for subsequent processing.

[0053] Processing stage

[0054] Machine tool starts processing: after the compatible tray 8 is accurately installed on the machine tool through the zero positioning system, the machine tool can carry out processing operation on the workpiece clamped on the non-standard machine tool outer clamp plate according to the preset processing program. Due to the accurate clamping and positioning in the early stage, the workpiece can remain stable during processing, effectively avoiding the processing precision deviation caused by clamping problems, and ensuring the processing quality.

[0055] Change the fixture and the workpiece stage

[0056] Disassembly after processing: when the workpiece processing is completed, the connection between the zero positioning disc 3 and the zero positioning pull nail 5 is loosened through pneumatic control, and the operator can easily take down the compatible tray 8 connected with the non-standard machine tool outer clamp plate from the machine tool.

[0057] Cyclic operation: after the processed workpiece is taken down, the operator can select or adjust the non-standard machine tool outer clamp plate according to the requirements of the next batch of workpieces, repeat the above steps, connect the new non-standard machine tool outer clamp plate with workpieces to the compatible tray 8, and then input into the machine tool for processing. This cycle realizes efficient and continuous production process.

[0058] In another preferred embodiment, a pre-positioning pin 6 is installed near each end of the zero positioning mounting plate 2, and a pre-positioning hole 7 is correspondingly opened on the standard machine tool outer clamp plate 4. The pre-positioning pin 6 installed at both ends of the zero positioning mounting plate 2 and the pre-positioning hole 7 correspondingly opened on the standard machine tool outer clamp plate 4 are in clearance fit. When the standard machine tool outer clamp plate 4 is installed on the machine tool, the pre-positioning pin 6 can play a role in preliminary positioning, guiding the subsequent zero positioning pull nail 5 and zero positioning disc 3 to complete the final positioning connection more accurately and quickly, reducing the adjustment time in the installation process, further improving the positioning accuracy of each clamping, and ensuring the stability of the processing precision.

[0059] In another preferred embodiment, a gas distribution pipe 10 is fixed on the rear side of the zero positioning mounting plate 2, high-pressure air is introduced into the gas distribution pipe 10, and a plurality of air injection holes are opened on the gas distribution pipe 10 and directed towards the workpiece. By fixing the gas distribution pipe 10 on the rear side of the zero positioning mounting plate 2 and introducing high-pressure air, and through the plurality of air injection holes directed towards the workpiece, the iron filings, dust and other impurities around the positioning area on the surface of the workpiece can be blown away in time and effectively during the clamping process and the processing process. In this way, impurities can be prevented from mixing into the workpiece positioning area to affect the positioning accuracy, and it is also helpful to keep the processing environment clean, reduce the problems such as tool wear and decline of processing surface quality caused by impurities, thereby improving the processing quality.

[0060] In another preferred embodiment, the scrap sweeper is installed on the spindle of the CNC machine tool accordingly. During the machining process, the spindle rotates at high speed, and the scrap sweeper can clean the iron scraps generated in the machining area in time with the movement of the spindle. On the one hand, it avoids mixing the iron scraps into the workpiece positioning area, prevents the problem of exacerbating the poor repeatability due to the interference of the iron scraps with the correct positioning of the workpiece, and guarantees the machining precision. On the other hand, it reduces the accumulation of iron scraps inside the machine tool, reduces the hindrance of the iron scraps to the movement of the machine tool components and the adverse effects on the cutting of the tool, helps to prolong the service life of the tool, keeps the inside of the machine tool clean, improves the overall machining environment quality, and further ensures the smooth progress and the stability of the machining quality.

[0061] In another preferred embodiment, a buffer damping pad with a thickness of 3-5mm is arranged between the bridge plate 1 and the zero positioning mounting plate 2. Arranging the buffer damping pad with a thickness of 3-5mm between the bridge plate 1 and the zero positioning mounting plate 2 can effectively buffer and absorb the vibration generated during the machining process of the machine tool. On the one hand, it reduces the transmission of vibration to the workpiece and the clamp, preventing the workpiece from loosening and the machining precision from decreasing due to vibration; on the other hand, it also helps to protect each component of the entire clamping system, reduces the probability of component wear and connection loosening due to long-term vibration, prolongs the service life of the system, and guarantees the stability and precision of the machining.

[0062] In another preferred embodiment, a storage chip 11 is arranged at one end of the standard machine external clamp plate 4, and the mechanical hand grabbing the standard machine external clamp plate 4 is provided with a reading device for reading the storage chip 11. The standard machine external clamp plate 4 is provided with a storage chip 11 at one end, and the mechanical hand grabbing it is provided with a reading device, so that the relevant information of the clamp plate, such as specifications, applicable workpiece types, clamping parameters, etc., can be stored in the chip. The mechanical hand reads these information when grabbing, which is convenient for the operator or the automatic control system to quickly and accurately understand the situation of the clamp plate, realizes the accurate management and use of the clamp plate, avoids affecting the machining efficiency and quality due to the use of wrong clamp plate caused by misoperation, and also facilitates the information tracing and management in the production process.

[0063] In another preferred embodiment, one end of the standard off-machine clamp plate 4 is provided with a side positioning draw pin 12, and the mechanical hand configured to grab the standard off-machine clamp plate 4 is provided with a side positioning disc adapted to the side positioning draw pin 12. One end of the standard off-machine clamp plate 4 is provided with a side positioning draw pin 12, and the mechanical hand configured to grab the standard off-machine clamp plate 4 is provided with a side positioning disc adapted to the side positioning draw pin 12. When the mechanical hand grabs the clamp plate, the cooperation of the side positioning draw pin 12 and the side positioning disc can further position the clamp plate from the side, complementing the positioning system composed of the zero-point positioning draw pin 5 and the zero-point positioning disc 3, and multi-dimensionally limiting the freedom of the clamp plate, so that the position of the clamp plate is more stable and accurate during the process of being grabbed and transported, installed, etc., ensuring the accuracy of the workpiece clamping position during subsequent machining, and improving the machining precision.

[0064] In another preferred embodiment, one end of the standard off-machine clamp plate 4 is provided with a V-shaped groove 13, and the side positioning draw pin 12 is arranged in the middle of the groove bottom of the V-shaped groove 13, and the mechanical hand configured to grab the standard off-machine clamp plate 4 is provided with a protrusion adapted to the V-shaped groove 13. The cooperation structure of the V-shaped groove 13 and the protrusion provides precise guidance for the mechanical hand to grab the standard off-machine clamp plate 4. During clamping, the mechanical hand can quickly and accurately find the grabbing position of the standard off-machine clamp plate 4 through the cooperation of the protrusion and the V-shaped groove 13, reduce the positional deviation during grabbing, improve the grabbing efficiency and accuracy, and thus improve the efficiency of the entire clamping process. The side positioning draw pin 12 is located in the middle of the groove bottom of the V-shaped groove 13, which ensures the relative position accuracy of the side positioning draw pin 12 and the corresponding components when the mechanical hand grabs the standard off-machine clamp plate 4. When the standard off-machine clamp plate 4 is installed to the relevant position of the machine tool, the side positioning draw pin 12 can be more accurately connected with the cooperating components, further improving the clamping positioning accuracy, ensuring the machining precision, and ensuring the stability of the machining quality. This structure design is simple and reliable, reduces the risk of tool deformation and workpiece displacement caused by inaccurate grabbing and positioning, improves the stability and reliability of the system operation, and provides strong support for large-scale and high-precision mechanical machining production operations.

[0065] In another preferred embodiment, the bottom of the standard off-machine clamp plate 4 is provided with a hollowed-out weight-reducing groove 14, which also serves as a handle. The hollowed-out weight-reducing groove 14 can effectively reduce the weight of the standard off-machine clamp plate 4 itself. During the process of handling by the robot and manual operation of the clamp plate by the operator, the reduced weight reduces the labor intensity, improves the operation convenience, and makes the movement, clamping and other operations of the clamp plate more relaxed and fast, which helps to improve the overall work efficiency. The hollowed-out weight-reducing groove 14 is used as a handle, which ingeniously utilizes the structural space and does not need to additionally design a special handle component. This not only simplifies the structure of the standard off-machine clamp plate 4, reduces the manufacturing cost and material consumption, but also avoids the installation precision problem and the interference risk of the handle to the surrounding components during the machining process, guarantees the smoothness of the machining process, and further improves the stability and economy of the production operation, thereby providing a strong guarantee for the efficient operation of the CNC high-precision off-machine clamping system.

[0066] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A CNC high precision machine outer clamping system comprising a bridge plate (1) fixed on the worktable surface of a CNC numerical control machine tool, characterized in that, The bridge plate (1) is provided with a zero point positioning mounting plate (2), and pneumatic zero point positioning discs (3) are arranged near both ends of the zero point positioning mounting plate (2); a plurality of standard external fixture plates (4) are further arranged, one side of each of the standard external fixture plates (4) is provided with two zero point positioning pull pins (5) matched with the zero point positioning discs (3), and the other side of the standard external fixture plate (4) is suitable for clamping a plurality of workpieces outside the machine.

2. A CNC high precision machine external clamping system according to claim 1, characterized in that, The standard external fixture plate (4) is replaced by a compatible tray (8), one side of the compatible tray (8) is provided with two zero point positioning pull pins (5) matched with the zero point positioning discs (3), and the other side of the compatible tray (8) is provided with at least two ball lock receiving sleeves (9), one side of a plurality of non-standard external fixture plates of different specifications is provided with a ball lock matched with the ball lock receiving sleeve (9), and the other side of the non-standard external fixture plate is suitable for clamping a plurality of workpieces outside the machine.

3. A CNC high precision machine external clamping system as claimed in claim 1, wherein, Pre-positioning pins (6) are arranged near both ends of the zero point positioning mounting plate (2), and corresponding pre-positioning holes (7) matched with the pre-positioning pins (6) are formed in the standard external fixture plate (4).

4. A CNC high precision machine external clamping system as claimed in claim 1, wherein, A gas distribution pipe (10) is fixedly arranged on the rear side of the zero point positioning mounting plate (2), high-pressure air is introduced into the gas distribution pipe (10), and a plurality of air injection holes facing the workpieces are formed in the gas distribution pipe (10).

5. A CNC high precision machine external clamping system as claimed in claim 1, wherein, Correspondingly, a scrap cleaner is arranged on the main shaft of the CNC numerical control machine tool.

6. A CNC high precision machine external clamping system as claimed in claim 1, wherein, A buffer damping pad is arranged between the bridge plate (1) and the zero point positioning mounting plate (2), and the thickness of the buffer damping pad is between 3-5mm.

7. A CNC high precision machine external clamping system as claimed in claim 1, wherein, A storage chip (11) is arranged at one end of the standard external fixture plate (4), and a mechanical hand grabbing the standard external fixture plate (4) is provided with a reading device reading the storage chip (11).

8. A CNC high precision machine external clamping system as claimed in claim 1, wherein, A side positioning pull pin (12) is arranged at one end of the standard external fixture plate (4), and a mechanical hand grabbing the standard external fixture plate (4) is provided with a side positioning disc matched with the side positioning pull pin (12).

9. A CNC high precision machine external clamping system as claimed in claim 8, wherein, A V-shaped groove (13) is formed at one end of the standard external fixture plate (4), the side positioning pull pin (12) is arranged in the middle of the groove bottom of the V-shaped groove (13), and a mechanical hand grabbing the standard external fixture plate (4) is provided with a protruding block matched with the V-shaped groove (13).

10. A CNC high precision machine external clamping system as claimed in claim 1, wherein, An air cutting weight reduction groove (14) is formed in the bottom of the standard external fixture plate (4), and the air cutting weight reduction groove (14) also serves as a handle.

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