High-precision numerical control milling device

Abstract

The invention belongs to the technical field of milling, and particularly relates to a high-precision numerical control milling device which comprises a main body framework, a main shaft and a chuck, and further comprises a mounting shell fixedly mounted on the main body framework, the liquid spray head is mounted on the mounting shell; the injection detection assembly is mounted on the mounting shell and comprises a circular plate mounted on the mounting shell; the gas nozzle is mounted on the circular plate, a detection structure is arranged on the gas nozzle, and the detection structure comprises a pressure sensor; according to the invention, the tasks of detection and energy conservation are completed by using gas, and the cooling liquid is focused on the work of cooling and lubrication, so that the two defects of low cooling efficiency and resource waste in the prior art are overcome, and the multiple beneficial effects of prolonging the service life of the cutter and reducing the comprehensive cost are finally realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of milling processing, in particular to a high-precision numerical control milling processing device. BACKGROUND

[0002] Numerical control milling processing has become the core processing technology in high-end manufacturing fields such as aerospace, automobile manufacturing, mold processing, medical devices, and precision electronics, with the advantages of high precision, high efficiency, and high flexibility. The core of numerical control technology is to convert the processing requirements of a part into machine-readable command signals through a pre-programmed digital program, and to control the movement of machine tool spindles, worktables, and other moving parts according to the pre-set trajectory by a numerical control system, so as to realize the relative movement of the tool and the workpiece and the automation of the processing process.

[0003] A patent application with publication number CN117655380A discloses a numerical control milling machine for valve accessory processing, which includes a main body structure and a main shaft installed on the main body structure. A chuck is installed on the main shaft, and a control component is installed on the chuck. The control component includes a support plate that is sleeved on the chuck, a sleeve is installed on the support plate, a spray head is arranged in the sleeve, and a first conductive ring and a second conductive ring are arranged on the spray head. The tool is clamped by the chuck, and the chuck and the tool are rotated synchronously by the main shaft to realize the cutting action.

[0004] In the above-mentioned scheme, the main shaft is powered off and stopped during the tool idle phase, and the spray head continuously sprays cooling liquid at the same time. When the tool approaches the workpiece, the reaction force generated by the impact of the cooling liquid on the surface of the workpiece will trigger the first conductive ring and the second conductive ring, thereby connecting the circuit and starting the main shaft for processing to achieve energy saving during the processing process. However, this scheme has the following defects, which restrict its actual application effect: 1. To achieve reliable detection, the direction of the spray head is fixed to point to the expected contact point of the milling cutter bottom end and the workpiece, which causes the cooling liquid to be mainly sprayed to the surface of the workpiece, rather than the high-temperature area generated by the tool cutting edge and the chips. This is particularly prominent in contour processing, and the tool cannot be effectively cooled and lubricated, thereby seriously affecting the service life of the tool; 2. The cooling liquid remains in the spraying state throughout the tool movement path, which not only causes a large amount of waste of cooling liquid, but also pollutes the non-processing area of the workpiece, increasing the subsequent cleaning workload and the maintenance cost of the working environment.

[0005] Therefore, the present application provides a high-precision numerical control milling processing device. SUMMARY

[0006] In order to make up for the deficiencies of the prior art and solve at least one technical problem raised in the background art.

[0007] The technical scheme adopted by the present application to solve its technical problems is: the high-precision numerical control milling device comprises a main body framework, a main shaft and a chuck, the main shaft is rotatably installed in the main body framework, the chuck is connected with the main shaft, and the chuck is rotatably connected with the main body framework, further comprising: an installation shell fixedly installed on the main body framework, a bearing installed between the installation shell and the chuck; a liquid spray head installed on the installation shell; a spray detection assembly installed on the installation shell, the spray detection assembly comprising: a circular plate installed on the installation shell; a gas spray head installed on the circular plate, the gas spray head being provided with a detection structure, the detection structure comprising a pressure sensor, when the cutter approaches the workpiece for milling, the recoil force generated by the gas spray head spraying triggers the pressure sensor; a control system electrically connected with the pressure sensor, the main shaft and the liquid spray head respectively, for receiving the trigger signal of the pressure sensor and outputting a control instruction.

[0008] Preferably, the gas spray head is connected with a first hose, one end of the first hose away from the gas spray head is communicated with a rigid pipe, the gas spray head is connected with the circular plate through the first hose and the rigid pipe, the detection structure further comprises a cylindrical shell sleeved on the outer periphery of the rigid pipe, and the cylindrical shell is fixedly connected with the installation shell, the first hose is located in the cylindrical shell, the gas spray head is slidably connected with the cylindrical shell, the gas spray head is provided with a first annular plate, the first annular plate is slidably connected with the cylindrical shell, a second annular plate is installed in the cylindrical shell, a first spring is installed between the first annular plate and the cylindrical shell, and the pressure sensor is installed on the second annular plate.

[0009] Preferably, the main shaft maintains a low-speed rotating state during the process that the cutter approaches the workpiece, and the rotating speed is lower than the working rotating speed required for milling, when the gas spray head is pushed by the recoil force and drives the first annular plate to stretch the first spring to slide, the first annular plate contacts the pressure sensor and triggers, after the trigger signal is transmitted to the control system, the main shaft accelerates to rotate to the working rotating speed, and the liquid spray head outputs the cooling liquid.

[0010] Preferably, the circular plate is rotatably connected with the installation shell, the spray detection assembly further comprises a threaded rod rotatably installed on the cylindrical shell, the second annular plate is slidably connected with the cylindrical shell, and the threaded rod is threadedly connected with the second annular plate.

[0011] Preferably, the spray detection assembly further comprises: a worm gear fixedly installed on the circular plate; and a worm rotatably installed on the installation shell, the worm gear is meshingly connected with the worm, and an end portion of the worm is provided with a groove for rotation.

[0012] Preferably, the injection detection assembly further comprises: a first bevel gear fixedly installed on the threaded rod, and in rotational connection with the rigid pipe; a second bevel gear rotatably installed on the installation shell, and in meshing connection with the first bevel gear; a first gear fixedly installed on the second bevel gear; a second gear rotatably installed on the circular plate; a third gear and a chain belt for driving the first gear and the second gear, the third gear being rotatably installed on the circular plate; and two rack plates fixedly installed on the installation shell, the two rack plates being respectively used for driving the second gear and the third gear to rotate.

[0013] Preferably, the injection detection assembly further comprises a plurality of first telescopic rods installed on the circular plate, one end of each of the first telescopic rods being fixedly installed on the circular plate, the other end of each of the first telescopic rods being towards the installation shell, and a second hose being in communication between the first telescopic rods, the second hose being in communication with the rigid pipe.

[0014] Preferably, the injection detection assembly further comprises: a socket formed on the first telescopic rod; a connecting plate slidably installed on the circular plate, the connecting plate comprising a plug rod matched with the socket, the plug rod being used for fixing the length of the first telescopic rod after being inserted into the socket, and a second spring being arranged between the connecting plate and the circular plate; a rotating plate rotatably installed on the installation shell, a plurality of second telescopic rods being fixedly installed on the rotating plate, the second telescopic rods being used for sliding the connecting plate, and a ball being nested at the end of each of the second telescopic rods towards the connecting plate; a fourth gear fixedly installed on the chuck; and a fifth gear rotatably installed on the installation shell, the fifth gear being in meshing connection with the rotating plate and the fourth gear.

[0015] Preferably, the detection structure further comprises: a resisting plate sleeved on the outer periphery of the gas injection head, the resisting plate being in sliding connection with the cylindrical shell; a third telescopic rod fixedly installed in the cylindrical shell, the third telescopic rod penetrating through the second annular plate and the first annular plate, and the end of the third telescopic rod being fixedly connected with the resisting plate.

[0016] Preferably, the detection structure further comprises: a third annular plate slidably installed on the cylindrical shell; and a third spring installed between the third annular plate and the first annular plate.

[0017] The present application has the following beneficial effects: 1. The high-precision numerical control milling device of the present application separates the "detection trigger" and "cooling and lubrication" functions, and the gas nozzle is responsible for detecting the position of the tool, while the liquid nozzle is used for cooling during cutting, which enables the cooling liquid to be accurately and concentratedly sprayed to the high-temperature area where the tool cutting edge contacts the workpiece, solving the problem of cooling invalidation caused by the deviation of the cooling liquid spraying target in the prior art, and the effect is particularly prominent in profile machining. The accurate cooling and lubrication effectively reduces the wear and thermal stress of the tool, thereby significantly prolonging the service life of the tool, and the continuously sprayed gas not only blows away the dust and hot air in the cutting area, but also accelerates the evaporation of the sprayed cooling liquid on the surface of the tool and the workpiece, uses the principle of liquid vaporization heat absorption to take away more heat, and forms a synergistic cooling effect of "gas-liquid double cooling".

[0018] 2. The high-precision numerical control milling device of the present application realizes on-demand cooling through the setting of the control system, and the cooling liquid is only sprayed during cutting, which completely avoids continuous spraying during tool idle movement, greatly reduces the waste of cooling liquid, not only saves material cost, but also avoids the pollution of the cooling liquid to the non-processing area of the workpiece, reduces the subsequent cleaning workload and the maintenance cost of the working environment, is conducive to clean production, and on the other hand, the spindle adopts an intelligent speed regulation mode of "low-speed idle movement-high-speed cutting", which reduces energy consumption compared with the traditional mode of high-speed rotation throughout the process, and can more reliably ensure that the tool reaches a safe cutting speed before contacting the workpiece compared with the traditional mode of rapidly adjusting from zero to high-speed rotation in a very short time, thereby ensuring processing safety.

[0019] 3. The high-precision numerical control milling device of the present application can flexibly adapt to different processing requirements of the workpiece through the adjustable setting of the angle and trigger threshold of the gas nozzle, and can automatically lock the circular plate after the gas supply and the spindle are started, realize the fixation of the position of the gas nozzle, and ensure the stability of the structure. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application will be further described below with reference to the accompanying drawings.

[0021] Figure 1 is a perspective view of an embodiment of the present application; Figure 2 is a cross-sectional side view of the mounting shell of the present application; Figure 3 is a cross-sectional view of the cylindrical shell of the present application; Figure 4 is Figure 2 is a local enlarged view of position A in FIG. 6; Figure 5 is a cross-sectional top view of the mounting shell of the present application; Figure 6 isFigure 5 Local enlarged view at B; Figure 7 is a partial sectional view of the mounting shell and the main body architecture of the present application; In the figure: 1, main body architecture; 2, bearing; 3, chuck; 4, mounting shell; 5, liquid spray head; 6, spray detection assembly; 61, round plate; 62, gas spray head; 63, detection structure; 631, pressure sensor; 632, cylindrical shell; 633, No. 1 annular plate; 634, No. 2 annular plate; 635, No. 1 spring; 636, stop plate; 637, No. 3 telescopic rod; 638, No. 3 annular plate; 639, No. 3 spring; 64, No. 1 hose; 65, rigid tube; 66, threaded rod; 67, worm; 68, worm wheel; 69, No. 1 bevel gear; 610, No. 2 bevel gear; 611, No. 1 gear; 612, No. 2 gear; 613, No. 3 gear; 614, rack plate; 615, No. 1 telescopic rod; 616, No. 2 hose; 617, jack; 618, connecting plate; 619, jack rod; 620, No. 4 gear; 621, No. 5 gear; 622, rotating plate; 623, No. 2 telescopic rod; 624, No. 2 spring. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in conjunction with specific embodiments.

[0023] As Figures 1-7 shown, the high-precision numerical control milling device of the embodiment of the present application comprises a main body architecture 1, a main shaft and a chuck 3, the main shaft is rotatably installed inside the main body architecture 1, the chuck 3 is connected with the main shaft, and the chuck 3 is rotatably connected with the main body architecture 1. The device further comprises: a mounting shell 4 fixedly installed on the main body architecture 1, a bearing 2 installed between the mounting shell 4 and the chuck 3; a liquid spray head 5 installed on the mounting shell 4; a spray detection assembly 6 installed on the mounting shell 4, which comprises: a round plate 61 installed on the mounting shell 4; a gas spray head 62 installed on the round plate 61, the gas spray head 62 is provided with a detection structure 63, the detection structure 63 comprises a pressure sensor 631, when a cutter approaches a workpiece for milling, the backflush force generated by the gas spray head 62 triggers the pressure sensor 631; a control system electrically connected with the pressure sensor 631, the main shaft and the liquid spray head 5 respectively, for receiving the trigger signal of the pressure sensor 631 and outputting a control instruction.

[0024] Specifically, in existing technologies, during the tool idle movement phase, the spindle is powered off and stops rotating, while the nozzle continuously sprays coolant. When the tool approaches the workpiece, the reaction force generated by the coolant impacting the workpiece surface triggers the first and second conductive rings, thereby connecting the circuit and starting the spindle for machining, achieving energy saving in the machining process. However, this solution has the following drawbacks, which restrict its practical application effect: 1. To achieve reliable detection, the nozzle direction is fixed to point towards the expected contact point between the bottom of the milling cutter and the workpiece. This causes the coolant to be mainly sprayed onto the workpiece surface, rather than the high-temperature area generated by the cutting edge and chips of the tool. This is particularly prominent in contour machining, failing to effectively cool and lubricate the tool, thus seriously affecting the tool's service life; 2. The coolant remains in a spraying state throughout the entire tool movement path. This not only wastes a large amount of coolant but also contaminates the non-machined areas of the workpiece, increasing the subsequent cleaning workload and maintenance costs of the working environment. Before operation, connect the gas nozzle 62 to the gas supply system. During the tool idle movement phase, the spindle is powered off and stops rotating. At the same time, the gas nozzle 62 continuously and stably sprays gas (the spray direction of the gas nozzle 62 is adapted to the cutting edge trajectory of the milling tool). When the tool approaches the workpiece, the reaction force generated by the gas impacting the workpiece surface will trigger the pressure sensor 631. The pressure sensor 631 transmits the signal to the control system. After receiving the signal, the control system controls the spindle to rotate and the liquid nozzle 5 to spray coolant. When the spindle approaches the workpiece, the cutting action can be realized. By separating the two conflicting goals of energy-saving triggering and effective cooling, gas is used to complete the tasks of "detection and energy saving," while the coolant focuses on its primary function of "cooling and lubrication." This not only solves the two major defects of low cooling efficiency and resource waste in existing technologies, but also achieves multiple beneficial effects such as extending tool life and reducing overall costs. At the same time, the continuously ejected gas can not only disperse the hot air in the cutting area, but also accelerate the evaporation of coolant on the tool and workpiece surfaces. Utilizing the principle of vaporization heat absorption, more heat is carried away, forming an enhanced effect of "gas-liquid dual cooling."

[0025] like Figures 2-4 As shown, a first hose 64 is connected to the gas nozzle 62. The end of the first hose 64 away from the gas nozzle 62 is connected to a rigid tube 65. The gas nozzle 62 is connected to the circular plate 61 through the first hose 64 and the rigid tube 65. The detection structure 63 also includes a cylindrical shell 632 sleeved on the outer periphery of the rigid tube 65, and the cylindrical shell 632 is fixedly connected to the mounting shell 4. The first hose 64 is located inside the cylindrical shell 632. The gas nozzle 62 is slidably connected to the cylindrical shell 632. A first annular plate 633 is installed on the gas nozzle 62. The first annular plate 633 is slidably connected to the cylindrical shell 632. A second annular plate 634 is installed inside the cylindrical shell 632. A first spring 635 is installed between the first annular plate 633 and the cylindrical shell 632. The pressure sensor 631 is installed on the second annular plate 634.

[0026] As Figures 3-4 shown, the main shaft maintains a low-speed rotation state during the process of the cutter approaching the workpiece, and the rotation speed is lower than the working rotation speed required for milling processing, when the gas jet head 62 is pushed by the recoil force and drives the first annular plate 633 to stretch the first spring 635 to slide, the first annular plate 633 contacts and triggers the pressure sensor 631, and after the trigger signal is transmitted to the control system, the main shaft accelerates to the working rotation speed, and the liquid jet head 5 outputs the cooling liquid.

[0027] Specifically, it needs a great starting torque and a certain acceleration time to accelerate from a stationary state to a working rotation speed of thousands or even tens of thousands of revolutions, and the window time of the cutter approaching the workpiece is extremely short during the high-speed idle process. If the acceleration process is slow, the cutter may contact the workpiece before reaching a sufficient rotation speed, which is no longer cutting, but "impact" or "extrusion grinding", which is extremely easy to cause the cutter to collapse, break, and even damage the main shaft and the workpiece, causing serious losses; The present application shortens the time required for acceleration from low speed to high speed and requires less torque because the main shaft already has a certain initial kinetic energy, which ensures that the cutter has a high probability of accelerating to a safe and effective cutting speed before contacting the workpiece, fundamentally avoiding damage to the cutter and work caused by acceleration delay. Although it increases the low-speed rotation, the power consumption is much lower than the power required to maintain the working rotation speed, so compared with the traditional mode of high-speed rotation throughout the process, the present application still achieves energy-saving effect.

[0028] As Figure 2 and Figure 3 shown, the circular plate 61 is rotationally connected with the mounting shell 4, the jet detection assembly 6 further comprises a threaded rod 66 rotationally installed on the cylindrical shell 632, the second annular plate 634 is slidingly connected with the cylindrical shell 632, and the threaded rod 66 is threadedly connected with the second annular plate 634.

[0029] Specifically, the rotation design of the circular plate 61 can adjust the angle between the airflow and the workpiece, and when processing workpieces containing grooves, it can more accurately blow away the debris from the processing surface, and by cooperating with the rotation of the threaded rod 66, the distance between the first annular plate 633 and the second annular plate 634 can be adjusted, and the recoil force threshold required for triggering the pressure sensor 631 can be flexibly set.

[0030] As Figure 2 and Figure 5 shown, the jet detection assembly 6 further comprises a worm gear 68 fixedly installed on the circular plate 61, and a worm 67 rotationally installed on the mounting shell 4, the worm gear 68 is meshingly connected with the worm 67, and the end portion of the worm 67 is provided with a groove for rotation.

[0031] Specifically, by rotating the worm 67, the worm wheel 68 can be pushed to rotate, the worm wheel 68 drives the circular plate 61 and the gas jet head 62 to rotate synchronously, so as to change the angle of the gas jet head 62 and adapt to different processing scene requirements.

[0032] As shown in Figures 2-5 , the jet detection assembly 6 further comprises: a first bevel gear 69 fixedly installed on the threaded rod 66, the first bevel gear 69 being rotationally connected with the rigid pipe 65; a second bevel gear 610 rotationally installed on the installation shell 4, the second bevel gear 610 being meshingly connected with the first bevel gear 69; a first gear 611 fixedly installed on the second bevel gear 610; a second gear 612 rotationally installed on the circular plate 61; a third gear 613 and a chain belt for driving the first gear 611 and the second gear 612, the third gear 613 being rotationally installed on the circular plate 61; and two rack plates 614 fixedly installed on the installation shell 4, the two rack plates 614 being respectively used for driving the second gear 612 and the third gear 613 to rotate.

[0033] Specifically, when the circular plate 61 rotates, the first gear 611 and the second gear 612 will synchronously revolve with the circular plate 61. According to the different rotation directions of the circular plate 61, the two rack plates 614 on the installation shell 4 will be meshed with the second gear 612 or the third gear 613 respectively to drive them to rotate: if the rack plate 614 is meshed to drive the second gear 612 to rotate, the power can be transmitted to the first gear 611 through the chain belt and the third gear 613 to drive the first gear 611 to rotate; the first gear 611 further drives the second bevel gear 610 to rotate, and the second bevel gear 610 further drives the meshed first bevel gear 69 to rotate, so as to finally drive the threaded rod 66 to rotate and move the second annular plate 634 towards the first annular plate 633, so as to adapt to the reduced gas backflow force in processing.

[0034] As shown in Figure 2 and Figures 5-6 , the jet detection assembly 6 further comprises a plurality of first telescopic rods 615 installed on the circular plate 61, one end of each first telescopic rod 615 being fixed on the circular plate 61, the other end of each first telescopic rod 615 facing the installation shell 4, and the first telescopic rods 615 being communicated with each other by a second hose 616, the second hose 616 being communicated with the rigid pipe 65.

[0035] Specifically, after being started, the gas enters the rigid pipe 65, part of the gas is sprayed out from the gas jet head 62 through the first hose 64, and the other part of the gas is delivered into the first telescopic rods 615 through the second hose 616 to make the first telescopic rods 615 extend, and the extended first telescopic rods 615 are respectively abutted against the circular plate 61 and the installation shell 4, so as to fix the position of the circular plate 61.

[0036] As shown in Figure 2 , Figures 4-7As shown, the injection detection assembly 6 further comprises: a socket 617 opened on the first telescopic rod 615; a connecting plate 618 slidingly installed on the circular plate 61, the connecting plate 618 comprising a plug rod 619 matched with the socket 617, the plug rod 619 being inserted into the socket 617 to fix the length of the first telescopic rod 615, and a second spring 624 being arranged between the connecting plate 618 and the circular plate 61; a rotating plate 622 rotatably installed on the mounting shell 4, the rotating plate 622 fixedly comprising a plurality of second telescopic rods 623, the second telescopic rods 623 being used to push the connecting plate 618 to slide, and the end of the second telescopic rod 623 towards the connecting plate 618 being nested with a ball; a fourth gear 620 fixedly installed on the chuck 3; and a fifth gear 621 rotatably installed on the mounting shell 4, the fifth gear 621 being meshingly connected with the rotating plate 622 and the fourth gear 620.

[0037] Specifically, the second telescopic rod 623 is internally provided with a spring for resetting; when the main shaft rotates, the chuck 3 and the fourth gear 620 synchronously rotate, the fourth gear 620 drives the rotating plate 622 to rotate through the fifth gear 621, and in the rotating process of the rotating plate 622, the second telescopic rod 623 thereon stretches under the action of centrifugal force, pushes the connecting plate 618 to slide relative to the circular plate 61, and makes the plug rod 619 inserted into the socket 617 of the first telescopic rod 615, so as to fix the length of the first telescopic rod 615 and realize the double fixation of the position of the circular plate 61, thereby guaranteeing the structural stability after the angle adjustment without manual intervention and improving the operation efficiency.

[0038] As shown in Figure 3 , the detection structure 63 further comprises: an abutment plate 636 sleeved on the outer periphery of the gas injection head 62, the abutment plate 636 being slidingly connected with the cylindrical shell 632; and a third telescopic rod 637 fixedly installed in the cylindrical shell 632, the third telescopic rod 637 penetrating through the second annular plate 634 and the first annular plate 633, and the end of the third telescopic rod 637 being fixedly connected with the abutment plate 636.

[0039] Specifically, the telescopic rod 637 is controlled by electricity, and in the machining scene of the penetrating hole, the conventional detection logic cannot be effective due to the absence of backflow of gas flow. Therefore, the third telescopic rod 637 is actively controlled to retract, the first annular plate 633 is pulled to be close to the second annular plate 634 by the transmission of the abutment plate 636, and the first annular plate 633 is always in the state of triggering the pressure sensor 631, so as to ensure the constant speed of the cutter.

[0040] As shown in Figure 3 , the detection structure 63 further comprises: a third annular plate 638 slidingly installed on the cylindrical shell 632; and a third spring 639 installed between the third annular plate 638 and the first annular plate 633.

[0041] Specifically, the elastic buffer structure formed by the cooperation of the two can adapt to airflow fluctuations, avoid false signals from the pressure sensor 631 due to unstable airflow, and prevent abnormal changes in the tool machining speed, thereby affecting the tool life and machining precision.

[0042] Working principle: Before work, the gas nozzle 62 is connected with the gas supply system. During the tool idle stage, the main shaft maintains a low-speed rotating state, and its speed is lower than the working speed required for milling. At the same time, the gas nozzle 62 continuously and stably sprays gas. When the tool approaches the workpiece, the reaction force generated by the gas impacting the surface of the workpiece will trigger the pressure sensor 631. The pressure sensor 631 transmits the signal to the control system. After receiving the signal, the control system controls the main shaft to accelerate to the working speed, and controls the liquid nozzle 5 to output cooling liquid at the same time. When processing a workpiece with a groove, rotating the worm 67 can drive the worm wheel 68 to rotate, and the worm wheel 68 drives the circular plate 61 and the gas nozzle 62 to rotate synchronously, so as to change the angle of the gas nozzle 62 and more accurately blow away the debris from the machining surface. When the circular plate 61 rotates, the first gear 611 and the second gear 612 will rotate synchronously with the circular plate 61. According to the different rotating directions of the circular plate 61, the two rack plates 614 on the mounting shell 4 will be engaged with the second gear 612 or the third gear 613 respectively, so as to drive them to rotate. If the rack plate 614 is engaged to drive the second gear 612 to rotate, the power can be transmitted to the first gear 611 through the chain and the third gear 613, so as to drive the first gear 611 to rotate. The first gear 611 further drives the second bevel gear 610 to rotate, and the second bevel gear 610 drives the engaged first bevel gear 69 to rotate, so as to finally drive the threaded rod 66 to rotate, and move the second annular plate 634 towards the first annular plate 633, so as to adapt to the reduced airflow reaction force in the processing. After the device is started, the gas enters the rigid pipe 65. Part of the gas is sprayed out from the gas nozzle 62 through the first hose 64, and the other part is delivered to the first telescopic rod 615 through the second hose 616, so as to drive the first telescopic rod 615 to extend. After the first telescopic rod 615 extends, its two ends are tightly pressed against the circular plate 61 and the mounting shell 4 respectively. At the same time, the rotation of the main shaft drives the chuck 3 and the fourth gear 620 to rotate synchronously. The fourth gear 620 drives the rotating plate 622 to rotate through the fifth gear 621. During the rotation of the rotating plate 622, the second telescopic rod 623 on the rotating plate 622 extends under the action of centrifugal force, pushes the connecting plate 618 to slide relative to the circular plate 61, and makes the insertion rod 619 inserted into the insertion hole 617 of the first telescopic rod 615, so as to fix the length of the first telescopic rod 615 and double-secure the position of the circular plate 61. For the machining scene such as the through hole, because the airflow does not exist the recoil effect, the conventional detection logic cannot take effect, based on this, the third telescopic rod 637 can be actively controlled to shrink, the first annular plate 633 is pulled close to the second annular plate 634 by the transmission action of the resistance plate 636, so that the first annular plate 633 is always in the state of triggering the pressure sensor 631, which can ensure the constant speed of the cutter.

[0043] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A high-precision CNC milling machining device, comprising a main frame (1), a spindle, and a chuck (3), wherein the spindle is rotatably mounted inside the main frame (1), the chuck (3) is connected to the spindle, and the chuck (3) is rotatably connected to the main frame (1), characterized in that, Also includes: A mounting shell (4) is fixedly installed on the main structure (1), and a bearing (2) is installed between the mounting shell (4) and the clamp (3). Liquid nozzle (5) mounted on the mounting housing (4); A jet detection assembly (6) mounted on the mounting housing (4), the jet detection assembly (6) comprising: A circular plate (61) mounted on the mounting housing (4); A gas nozzle (62) is installed on the circular plate (61). A detection structure (63) is provided on the gas nozzle (62). The detection structure (63) includes a pressure sensor (631). When the tool approaches the workpiece for milling, the recoil force generated by the gas nozzle (62) triggers the pressure sensor (631). The control system is electrically connected to the pressure sensor (631), the main shaft and the liquid nozzle (5) respectively, and is used to receive the trigger signal of the pressure sensor (631) and output control commands.

2. The high-precision CNC milling machining device according to claim 1, characterized in that: A first flexible tube (64) is connected to the gas nozzle (62). The end of the first flexible tube (64) away from the gas nozzle (62) is connected to a rigid tube (65). The gas nozzle (62) is connected to the circular plate (61) through the first flexible tube (64) and the rigid tube (65). The detection structure (63) also includes a cylindrical shell (632) sleeved on the outer periphery of the rigid tube (65), and the cylindrical shell (632) is fixedly connected to the mounting shell (4). The first flexible tube (64) is located on the cylindrical shell. Inside the cylindrical shell (632), the gas nozzle (62) is slidably connected to the cylindrical shell (632), a first annular plate (633) is installed on the gas nozzle (62), the first annular plate (633) is slidably connected to the cylindrical shell (632), a second annular plate (634) is installed inside the cylindrical shell (632), a first spring (635) is installed between the first annular plate (633) and the cylindrical shell (632), and the pressure sensor (631) is installed on the second annular plate (634).

3. The high-precision CNC milling machining device according to claim 2, characterized in that: The spindle maintains a low-speed rotation state as the tool approaches the workpiece, and its rotation speed is lower than the working speed required for milling. When the gas nozzle (62) is pushed by the recoil force and drives the first annular plate (633) to stretch the first spring (635) to slide, the first annular plate (633) contacts the pressure sensor (631) and triggers it. After the trigger signal is transmitted to the control system, the spindle accelerates to the working speed, and the liquid nozzle (5) outputs coolant.

4. The high-precision CNC milling machining device according to claim 2, characterized in that: The circular plate (61) is rotatably connected to the mounting shell (4), and the spray detection assembly (6) further includes a threaded rod (66) rotatably mounted on the cylindrical shell (632). The second annular plate (634) is slidably connected to the cylindrical shell (632), and the threaded rod (66) is threadedly connected to the second annular plate (634).

5. The high-precision CNC milling machining device according to claim 2, characterized in that: The jet detection component (6) also includes: A worm gear (68) is fixedly mounted on the circular plate (61); Rotate the worm (67) mounted on the mounting housing (4), the worm wheel (68) meshes with the worm (67), and the end of the worm (67) is provided with a groove for rotation.

6. The high-precision CNC milling machining device according to claim 4, characterized in that: The jet detection component (6) also includes: A first bevel gear (69) is fixedly installed on the threaded rod (66), and the first bevel gear (69) is rotatably connected to the rigid tube (65); Rotate the second bevel gear (610) mounted on the mounting housing (4), and the second bevel gear (610) meshes with the first bevel gear (69); Gear No. 1 (611) is fixedly installed on the No. 2 bevel gear (610); Rotate the second gear (612) mounted on the circular plate (61); A third gear (613) and a chain belt are used to drive the first gear (611) and the second gear (612). The third gear (613) is rotatably mounted on the circular plate (61). Two rack plates (614) are fixedly mounted on the mounting shell (4). The two rack plates (614) are used to drive the second gear (612) and the third gear (613) to rotate, respectively.

7. The high-precision CNC milling machining device according to claim 2, characterized in that: The spray detection assembly (6) also includes several first telescopic rods (615) mounted on the circular plate (61). One end of the first telescopic rod (615) is fixed on the circular plate (61), and the other end of the first telescopic rod (615) faces the mounting shell (4). The first telescopic rods (615) are connected by second hoses (616), and the second hoses (616) are connected to the rigid pipe (65).

8. The high-precision CNC milling machining device according to claim 7, characterized in that: The jet detection component (6) also includes: Insertion hole (617) is provided on the first telescopic rod (615); A connecting plate (618) is slidably mounted on a circular plate (61). The connecting plate (618) contains a plug rod (619) that mates with the insertion hole (617). After the plug rod (619) is inserted into the insertion hole (617), the first telescopic rod (615) is fixed in length. A second spring (624) is provided between the connecting plate (618) and the circular plate (61). Rotate the rotating plate (622) mounted on the mounting shell (4). Several second telescopic rods (623) are fixedly mounted on the rotating plate (622). The second telescopic rods (623) are used to push the connecting plate (618) to slide. The end of the second telescopic rod (623) facing the connecting plate (618) is nested with ball bearings. The fourth gear (620) is fixedly installed on the chuck (3); Rotate the fifth gear (621) mounted on the mounting housing (4), which meshes with the rotating plate (622) and the fourth gear (620) respectively.

9. A high-precision CNC milling machining device according to claim 2, characterized in that: The detection structure (63) further includes: A stop plate (636) is fitted around the outer periphery of the gas nozzle (62), and the stop plate (636) is slidably connected to the cylindrical shell (632); The third telescopic rod (637) is fixedly installed inside the cylindrical shell (632). The third telescopic rod (637) passes through the second annular plate (634) and the first annular plate (633). The end of the third telescopic rod (637) is fixedly connected to the abutment plate (636).

10. A high-precision CNC milling machining device according to claim 2, characterized in that: The detection structure (63) further includes: A third annular plate (638) is slidably mounted on the cylindrical shell (632); A third spring (639) is installed between the third annular plate (638) and the first annular plate (633).

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