Numerical control milling device for cooling water jacket runner of marine diesel engine

Abstract

The present application relates to the technical field of milling device, specifically to a marine diesel engine cooling jacket runner numerical control milling device, which comprises a casing, both sides of the casing are provided with a fan, a vibration frame is slidably arranged on the casing, and a vibration generating mechanism is arranged between the casing and the vibration frame, the vibration generating mechanism drives the vibration frame to alternately vibrate with three different strokes, a turnover frame is rotatably arranged on the vibration frame, the turnover frame is selectively driven by a turnover motor and turns around a horizontal axis, a three-axis driving platform is arranged on the upper part of the turnover frame, a double-axis clamping mechanism is fixedly arranged on the lower part of the turnover frame, a three-axis carriage is connected to the three-axis driving platform, a milling seat is connected to the surface of the three-axis carriage through a first rotary platform, and a milling shaft driven by a servo motor is arranged on the milling seat. The present application has the beneficial effects that: the chips are broken by the variable amplitude vibration and ultrasonic vibration, the built-in jet hole is used for precise flushing and negative pressure suction, multiple mechanisms are used for chip removal, and the problem of difficult chip removal in deep cavity curved runner is solved.

Description

Technical Field

[0001] This invention relates to the field of milling equipment technology, specifically a CNC milling device for cooling water jacket channels of marine diesel engines. Background Technology

[0002] The cooling water jacket of a marine diesel engine is a core component of the engine cylinder cooling system. Its internal flow channels typically feature deep cavities, numerous bends, and complex spatial orientations, demanding extremely high machining precision and surface quality. Currently, the machining of cooling water jacket flow channels primarily employs CNC milling. Among existing technologies, Chinese invention patent CN120002057B discloses a milling device and method for a steel bed milling machine. This device uses a vibration component to vibrate the perforated plate to prevent debris from clogging it, and uses a fluid replenishment component to circulate and replenish the milling fluid. This solution mainly addresses the problems of obstructed milling fluid circulation and perforated plate clogging during steel bed milling, focusing on the recovery and circulation management of the cutting fluid. However, for workpieces like marine diesel engine cooling water jackets with complex spatial flow channels, the existing technology still has the following unresolved technical problems: Marine cooling water jacket channels often have a large depth-to-diameter ratio and complex curvature. Milling chips are prone to accumulate and entangle at the bottom or bends of the channel. Conventional cutting fluid flushing is difficult to effectively remove the chips. Chip residue not only affects the quality of the machined surface, but may also cause the milling cutter head to chip or even break. In deep cavity and curved channel machining, traditional external pouring cooling methods are limited by the narrow gap between the milling cutter head and the workpiece. Cutting fluid has difficulty penetrating to the contact interface between the cutter tip and the chips, resulting in a significant reduction in cooling and lubrication effects. This leads to increased wear of the milling cutter head and an increased risk of machining thermal damage. At the same time, existing milling equipment mostly relies on single methods such as cutting fluid flushing or negative pressure suction for chip removal. When faced with working conditions with variable channel shapes and frequent changes in machining posture, it is difficult to flexibly adjust the chip removal strategy according to the needs of different machining stages, resulting in low chip removal efficiency. Based on this, the present invention provides a CNC milling device for cooling water jacket flow channels of marine diesel engines to solve the problems mentioned in the background art. Summary of the Invention

[0003] This invention addresses the technical problems existing in the prior art by providing a CNC milling device for cooling water jacket channels of marine diesel engines, which solves the problems of difficult chip removal from deep channels and insufficient adaptability of single chip removal mechanisms in existing milling devices.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: a CNC milling device for cooling water jacket flow channel of marine diesel engine, including a housing, fans installed on both sides of the housing, a vibrating frame slidably arranged on the housing, and a vibration generating mechanism between the two, the vibration generating mechanism driving the vibrating frame to vibrate alternately with three different stroke amplitudes. A tilting frame is rotatably mounted on the vibration frame. The tilting frame is selectively driven by a tilting motor and rotates around a horizontal axis. The upper part of the flipping frame is equipped with a three-axis drive platform, and the lower part is fixedly installed with a dual-axis clamping mechanism. A three-axis moving frame is connected to the three-axis drive platform. The surface of the three-axis moving frame is connected to a milling seat through a first rotary platform. A milling axis driven by a servo motor is installed on the milling seat. The vibration direction of the vibrating frame is parallel to the axis of the milling axis. A milling cutter head is installed at the bottom of the milling axis. An ultrasonic vibration unit is provided on the milling cutter head. The workpiece is clamped on the dual-axis clamping mechanism. The milling base is also equipped with a negative pressure suction hood that is coaxially arranged with the milling shaft and connected to an external sewage pump. The outer circumferential surface of the milling shaft has a spray hole near the milling cutter head. A liquid injection mechanism for supplying liquid to the injection orifice; A water-cooled box is fixedly installed at the bottom of the casing. The water-cooled box contains cutting fluid, and ultrasonic vibrating rods are arranged in an array at the bottom of the water-cooled box. The control unit enables the device to selectively operate in either a first processing posture or a second processing posture. In the first machining posture, the tilting frame positions the milling axis below the dual-axis clamping mechanism, the vibrating frame vibrates in a controllable manner, and the negative pressure suction hood sucks up waste chips and waste liquid; In the second machining posture, the tilting frame positions the milling axis above the dual-axis clamping mechanism, and the workpiece is fully immersed in the cutting fluid. The tilting frame can rotate within a range of 110° around its horizontal axis and maintain the milling process during the rotation. The vibrating frame vibrates selectively during the rotation, and the fan and the negative pressure suction hood do not work at the same time.

[0005] Based on the above technical solution, the present invention can be further improved as follows.

[0006] Optionally, two gates are slidably installed on the end face of the housing, and each gate is provided with a transparent window. A first synchronous belt is driven on the output shaft of the flipping motor. The first synchronous belt is connected to the flipping frame and is made of rubber.

[0007] Optionally, the vibration generating mechanism includes a drive motor fixedly mounted on the housing and a drive shaft rotatably mounted on the housing. A second synchronous belt is driven on the output shaft of the drive motor and is connected to the drive shaft. A wheel is mounted on the outer circumferential surface of the drive shaft, and three protrusions with different radial heights are mounted on the outer circumferential surface of the wheel. Rollers are rotatably mounted on the vibration frame. When the drive shaft is configured to rotate, the three protrusions alternately push the rollers. Two return springs are mounted on the bottom surface of the vibration frame, and the bottom ends of the two return springs are fixedly connected to the housing.

[0008] Optionally, the dual-axis clamping mechanism is used to drive the workpiece to deflect in two directions, and the two rotation directions of the dual-axis clamping mechanism are different from the rotation direction of the first rotary platform.

[0009] Optionally, a corrugated sealing cover is fixedly installed on the outer periphery of the vibration frame, and the corrugated sealing cover is fixedly connected to the housing.

[0010] Optionally, the spraying mechanism includes a liquid storage tank fixedly installed on the moving end of the three-axis drive platform. A pump body is installed at the bottom of the liquid storage tank. A flexible hose is connected to the outlet port of the pump body. A liquid supply ring is sealed on the milling shaft. The liquid supply ring is fixedly connected to the milling seat. The other end of the flexible hose is connected to the liquid supply ring. A flow channel is opened inside the milling shaft. A through hole is opened on the milling shaft at a position corresponding to the inner side of the liquid supply ring. The through hole and the spray hole are both connected to the flow channel. The spray hole is inclined downward toward the axis of the milling shaft, and the angle between the axis of the spray hole and the axis of the milling shaft is 40°.

[0011] Optionally, the ultrasonic vibration unit includes an ultrasonic vibration table slidably mounted on a three-axis moving frame, a milling shaft rotatably mounted on the ultrasonic vibration table via bearings, a drive shaft fixedly mounted on the output shaft of the servo motor, a splined socket with an open bottom on the drive shaft, a bonding section slidably connected to the splined socket on the milling shaft, both the splined socket and the bonding section having a regular hexagonal cross-section, an ultrasonic transducer mounted on the ultrasonic vibration table, and a return spring installed between the ultrasonic vibration table and the three-axis moving frame.

[0012] Optionally, the dual-axis clamping mechanism includes a positioning frame fixedly mounted on a flipping frame, a rotation frame rotatably mounted on the positioning frame via bearings, two rotary motors mounted on the positioning frame, the output shaft ends of the two rotary motors being fixedly connected to the rotation frame, a second rotary platform rotatably mounted on the rotation frame, and a clamp mounted on the second rotary platform.

[0013] Optionally, a refrigeration module is integrated inside the water-cooled box, and a drain valve is connected to the bottom of the water-cooled box.

[0014] Optionally, the control unit includes a central control host fixedly installed on the end face of the housing and a vibration sensor fixedly installed on the tilting frame. The servo motor, drive motor and tilting motor all integrate encoders, and the data terminals of the encoders and vibration sensors are all connected to the central control host.

[0015] The beneficial effects of this invention are: 1. This invention drives a vibration frame to alternately vibrate with three different stroke amplitudes via a vibration generating mechanism, ensuring the vibration direction is parallel to the milling axis. This vibration is directly transmitted to the milling cutter head and the workpiece clamping area. In deep cavity and curved flow channel machining, this amplitude-variable vibration effectively breaks the entanglement and adhesion of continuous chips, causing the chips to break and detach from the milling cutter head and the machined surface. Simultaneously, the ultrasonic vibration unit on the milling cutter head generates high-frequency axial vibration, which reduces the average cutting force and cutting heat on the one hand, and enhances the cavitation effect of the cutting fluid and its effect on the contact interface between the cutter tip and the chip on the other. Based on its penetration capability, the jetting holes on the outer circumference of the milling shaft near the milling cutter head precisely inject cutting fluid into the cutting area at a 40° downward angle. The jetting kinetic energy pushes the chips out of the chip groove and guides them towards the negative pressure suction shroud. This creates a synergistic chip removal mechanism between mechanical disturbance, fluid flushing, and negative pressure suction. In curved flow channels with limited chip removal space, this multi-mechanism linkage chip removal method, compared to existing technologies that rely on single means such as cutting fluid flushing or negative pressure suction, can flexibly adjust the chip removal strategy according to the chip accumulation state, effectively improving the problem of difficult chip removal from deep within the flow channel.

[0016] 2. This invention allows the device to selectively operate in either a first or second machining posture via a tilting frame. In the first machining posture, the milling axis is positioned below the dual-axis clamping mechanism, and a negative pressure suction hood removes chips and waste fluid, suitable for roughing or machining stages with relatively open chip removal spaces. In the second machining posture, the milling axis is positioned above the dual-axis clamping mechanism, the workpiece is completely immersed in the cutting fluid in the water-cooled tank, and the tilting frame can rotate within a 110° range while maintaining the milling operation, suitable for finishing deep cavities and complex curved flow channels. This posture switching capability, combined with the selective activation of the vibration generating mechanism, ensures that vibration only occurs at the start of chip cutting. Intervention during entanglement or accumulation avoids ineffective operation. Meanwhile, the ultrasonic vibrating rods arrayed in the water-cooled box further clean the workpiece surface through cavitation effect. The cooling module maintains a constant temperature for the cutting fluid. The control unit coordinates the actions of each mechanism in real time based on feedback data from the encoder and vibration sensor, and performs interlock control on the fan and negative pressure suction hood during the second posture flipping process. The above-mentioned linkage control method based on machining posture and real-time working conditions is significantly different from the milling device with fixed machining posture and single chip removal mechanism in the existing technology. It can take into account chip removal efficiency, cooling effect and machining continuity in complex flow channel machining. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the CNC milling device for the cooling water jacket flow channel of the marine diesel engine of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the cross-sectional structure; Figure 3 This is a schematic diagram of the structure of the flip motor and drive motor of the present invention; Figure 4 For the present invention Figure 3 A structural diagram from another perspective; Figure 5 This is a schematic diagram of the negative pressure suction cup and the three-axis drive platform of the present invention; Figure 6 For the present invention Figure 5 A structural diagram from another perspective; Figure 7 This is a schematic diagram of the servo motor and negative pressure suction cover of the present invention; Figure 8 For the present invention Figure 7 A schematic diagram of the cross-sectional structure; Figure 9 This is a schematic diagram of the positioning frame and clamp of the present invention; Figure 10 This is a schematic diagram of the drive shaft of the present invention. Figure 11 This is a structural diagram of the tilting frame; Figure 12 for Figure 11 A frontal view of the structure.

[0018] The attached diagram lists the components represented by each number as follows: 1. Housing; 2. Vibration frame; 3. Tilting frame; 4. Water-cooled box; 5. Drive motor; 6. Positioning frame; 7. Workpiece; 101. Fan; 102. Baffle; 103. Central control unit; 201. Corrugated sealing cover; 301. Tilting motor; 302. Three-axis drive platform; 303. Three-axis moving frame; 304. First rotary platform; 305. Milling base; 306. Servo motor; 307. Milling axis; 308. Milling cutter head; 309. Negative pressure suction hood; 310. Suction... Sewage pump; 311, spray hole; 312, through hole; 313, drive shaft; 314, ultrasonic transducer; 315, return spring; 316, vibration sensor; 317, ultrasonic vibration table; 318, liquid storage tank; 319, liquid supply ring; 401, ultrasonic transducer; 402, cooling module; 501, drive shaft; 502, protrusion; 503, roller; 504, return spring; 601, indexing frame; 602, rotary motor; 603, second rotary platform; 604, fixture. Detailed Implementation

[0019] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0020] The present invention provides the following preferred embodiments. like Figure 1-12 As shown, the CNC milling device for the cooling water jacket flow channel of a marine diesel engine includes a housing 1. Two baffles 102 are slidably installed on the end face of the housing 1. Each baffle 102 is provided with a transparent window. Fans 101 are installed on both sides of the housing 1. A vibration frame 2 is slidably installed on the housing 1. A vibration generating mechanism is provided between the housing 1 and the vibration frame 2. The vibration generating mechanism drives the vibration frame 2 to vibrate alternately with three different stroke amplitudes. A corrugated sealing cover 201 is fixedly installed on the outer periphery of the vibration frame 2. The corrugated sealing cover 201 is fixedly connected to the housing 1. In a preferred embodiment, two guide rails arranged vertically are installed on the back of the housing 1, and a slide table that is slidably connected to the guide rails is installed on the vibration frame 2. Flange connecting plates are fixedly installed at the ends of the two fans 101 away from the housing 1, so that the two fans 101 are connected to the external reserved ventilation duct. The vibration generating mechanism includes a drive motor 5 fixedly mounted on the housing 1 and a drive shaft 501 rotatably mounted on the housing 1. A second synchronous belt is driven on the output shaft of the drive motor 5 and is connected to the drive shaft 501. A wheel is mounted on the outer circumferential surface of the drive shaft 501, and three protrusions 502 with different radial heights are mounted on the outer circumferential surface of the wheel. A roller 503 is rotatably mounted on the vibration frame 2. When the drive shaft 501 is rotated, the three protrusions 502 alternately push the roller 503. Two return springs 504 are mounted on the bottom surface of the vibration frame 2, and the bottom ends of the two return springs 504 are fixedly connected to the housing 1. The above structural design is mainly aimed at addressing the problems of complex shape, numerous bends, and difficulty in chip removal in marine diesel engine cooling water jackets. During operation, the drive motor 5 drives the drive shaft 501 and the wheel to rotate via the second synchronous belt; The three protrusions 502 with different radial heights on the outer periphery of the wheel will contact and push the rollers 503 on the vibration frame 2 in turn. Since the protrusions 502 have different heights, their pushing force and stroke on the rollers 503 are also different, thereby driving the vibration frame 2 to produce three different strokes of alternating amplitude vibration. When the protrusion 502 pushes the roller 503, the vibrating frame 2 slides upward against the tension of the return spring 504; When the protrusion 502 rotates past its highest point, the return spring 504 pulls the vibration frame 2 back, and so on, forming a controllable, non-single-frequency mechanical vibration.

[0021] This type of amplitude vibration is directly transmitted to the entire milling mechanism mounted on the vibration frame 2; When performing deep cavity and curved flow channel milling, periodic vibration can effectively break the adhesion and entanglement between the chips and the milling cutter head 308 and the machined surface of the workpiece 7. Especially for tough materials or in cases where continuous chip curling occurs, vibration can make the chips easier to break and detach. Secondly, vibration energy helps to disturb the chips accumulated in the dead corners of the curved flow channel. Combined with the cutting fluid flushing and the negative pressure suction shroud 309, it forms a synergistic chip removal mode of mechanical disturbance, fluid flushing, gravity discharge and negative pressure extraction, which significantly improves the chip removal environment of complex cavities. Furthermore, the introduction of vibration can replace or reduce the lifting action of the milling cutter head 308 in specific machining stages, providing a physical basis for achieving non-stop machining under specific working conditions, and ensuring the continuity of machining by dynamically maintaining the unobstructed flow of the cutting zone. A tilting frame 3 is rotatably mounted on the vibration frame 2 via bearings. The tilting frame 3 is selectively driven by a tilting motor 301 and rotates around a horizontal axis. In a preferred embodiment, a first synchronous belt is driven and installed on the output shaft of the flipping motor 301. The first synchronous belt is driven and connected to the flipping frame 3. The first synchronous belt is made of rubber, and the maximum elastic deformation of the first synchronous belt is greater than the maximum radial protrusion height of the protrusion 502. The upper part of the flipping frame 3 is equipped with a three-axis drive platform 302, and the lower part is fixedly installed with a dual-axis clamping mechanism. The three-axis drive platform 302 is connected to a three-axis transfer frame 303. The surface of the three-axis transfer frame 303 is connected to a milling seat 305 through a first rotary platform 304. The milling seat 305 is equipped with a milling axis 307 driven by a servo motor 306. The vibration direction of the vibration frame 2 is parallel to the axis of the milling axis 307. The bottom end of the milling axis 307 is equipped with a milling cutter head 308. The milling cutter head 308 is equipped with an ultrasonic vibration unit. The dual-axis clamping mechanism is clamped with a workpiece 7. The servo motor 306 drives the milling shaft 307 to rotate at high speed through the engagement of the transmission shaft 313, spline socket and key section, to complete the main cutting motion; At the same time, the independent ultrasonic transducer 314 is activated, driving the ultrasonic transducer 317 and the milling shaft 307 mounted on it via bearings to generate high-frequency, small-amplitude reciprocating vibrations along its axial direction. The return spring 315 is used to maintain the elastic connection and reset between the ultrasonic stage 317 and the triaxial frame 303.

[0022] The introduction of ultrasonic vibration alters the interaction mechanism between the milling cutter head 308 and the workpiece 7. High-frequency impact superimposed on continuous cutting can reduce the average cutting force and cutting heat. For the narrow and deep structures commonly found in cooling water jacket channels, ultrasonic vibration greatly enhances the cavitation effect and penetration ability of the cutting fluid.

[0023] Under ultrasonic action, the cutting fluid can more easily enter the contact interface between the tool tip and the chip, as well as the friction surface between the milling cutter head 308 and the workpiece 7, improving the cooling and lubrication effect and further assisting in chip breaking. The ultrasonic vibration unit includes an ultrasonic vibration table 317 slidably mounted on a three-axis shifter 303, a milling shaft 307 rotatably mounted on the ultrasonic vibration table 317 via bearings, a transmission shaft 313 fixedly mounted on the output shaft of a servo motor 306, a splined socket with an open bottom on the transmission shaft 313, a keying section slidably connected to the splined socket on the milling shaft 307, both the splined socket and the keying section having a regular hexagonal cross section, an ultrasonic transducer 314 mounted on the ultrasonic vibration table 317, and a return spring 315 installed between the ultrasonic vibration table 317 and the three-axis shifter 303. The dual-axis clamping mechanism is used to drive the workpiece 7 to deflect in two directions, and the two rotation directions of the dual-axis clamping mechanism are different from the rotation direction of the first rotary platform 304. The dual-axis clamping mechanism includes a positioning frame 6 fixedly installed on the flipping frame 3. A rotation frame 601 is rotatably mounted on the positioning frame 6 via bearings. Two rotary motors 602 are mounted on the positioning frame 6. The output shaft ends of the two rotary motors 602 are fixedly connected to the rotation frame 601. A second rotary platform 603 is rotatably mounted on the indexing frame 601, and a clamp 604 is mounted on the second rotary platform 603; The two rotary motors 602 are synchronous motors, which are synchronously controlled by the same drive signal. The second rotary platform 603 and the two rotary motors 602 are all equipped with waterproof and sealed housings. Fixture 604 is a pneumatic three-jaw chuck or a hydraulic expansion type fixture 604; The milling base 305 is also provided with a negative pressure suction cover 309 that is coaxially arranged with the milling shaft 307 and connected to the external suction pump 310. The outer peripheral surface of the milling shaft 307 is provided with a spray hole 311 near the milling cutter head 308. A liquid injection mechanism is used to supply liquid to the injection hole 311; The spraying mechanism includes a liquid storage tank 318 fixedly installed on the moving end of the three-axis drive platform 302. A pump body is installed at the bottom of the liquid storage tank 318. The outlet port of the pump body is connected to a flexible hose. A liquid supply ring 319 is sealed on the milling shaft 307 by a rotary sealing ring. The liquid supply ring 319 is fixedly connected to the milling seat 305. The other end of the flexible hose is connected to the liquid supply ring 319. A flow channel is opened inside the milling shaft 307. A through hole 312 is opened on the milling shaft 307 at the position corresponding to the inner side of the liquid supply ring 319. The through hole 312 and the spray hole 311 are both connected to the flow channel. The spray hole 311 is inclined downward towards the axis of the milling shaft 307, and the angle between the axis of the spray hole 311 and the axis of the milling shaft 307 is 40°. The cutting fluid in the reservoir 318 is pumped out by the pump body and delivered to the supply ring 319 fixed on the milling seat 305 via a flexible hose. The supply ring 319 and the high-speed rotating milling shaft 307 are sealed to ensure that the liquid does not leak out. The cutting fluid enters the flow channel opened inside the milling shaft 307 through the through hole 312 on the milling shaft 307 corresponding to the inner side of the supply ring 319, and is finally ejected at high speed from the spray hole 311 near the milling head 308. The above-mentioned structural configuration allows the cutting fluid to be ejected directly from the inside of the rotating cutter body through the injection hole 311 near the milling head 308, ensuring that the cutting fluid can follow the tip of the cutter no matter where the milling head 308 is inserted into the flow channel. The 40° downward tilt angle design gives the jet a component that points directly below and to the side and rear of the cutting area; This not only directly cools the cutting tip and the new surface, but also uses jet kinetic energy to flush the chips accumulated in front of and on the sides of the milling head 308 to the surroundings or backwards. It is especially beneficial to push the chips out of the chip groove of the milling head 308 and guide them towards the negative pressure suction shroud 309. This built-in precision injection and angle guidance enhances the active role of cutting fluid in chip removal in curved flow channel machining where chip removal space is limited. Together with vibration chip removal and negative pressure suction, it forms a multi-mechanism synergistic chip removal system. A water-cooled box 4 is fixedly installed at the lower part of the casing 1. The water-cooled box 4 contains cutting fluid, and an ultrasonic vibrating rod 401 is arranged in an array at the bottom of the water-cooled box 4. A refrigeration module 402 is integrated and installed inside the water-cooled box 4. A drain valve is connected to the bottom of the water-cooled box 4. In the second machining posture, the workpiece 7 is completely immersed in the cutting fluid in the water-cooled tank 4 for wet milling; The cutting fluid absorbs a large amount of heat generated during processing. The integrated cooling module 402 can actively cool the cutting fluid in the chamber, maintain its constant low temperature, and ensure continuous and efficient cooling capacity. The ultrasonic vibrating rods 401 arrayed at the bottom of the chamber work periodically to generate high-frequency vibrations that propagate in the liquid. The workpiece 7 and the milling cutter head 308 are completely surrounded by cutting fluid, and the heat is quickly carried away, eliminating oil mist and dust in the machining area; The ultrasonic waves generated by the ultrasonic vibrator 401 can further help separate the fine chips attached to the workpiece 7 or the box wall through cavitation effect and microfluidics, preventing them from re-attaching to the surface of the workpiece 7 and affecting accuracy. Ultrasonic waves can promote the uniform mixing of the cutting fluid and prevent impurities from settling.

[0024] The control unit enables the CNC milling device for the cooling water jacket of the marine diesel engine to selectively operate in either the first or second machining posture. In the first machining posture, the flipping frame 3 positions the milling axis 307 below the dual-axis clamping mechanism, the vibrating frame 2 vibrates controllably, and the negative pressure suction hood 309 sucks up waste chips and waste liquid. In this embodiment, the first processing posture is a dry milling state. Its core design purpose is to allow the waste chips generated by milling the workpiece 7 to be discharged naturally downward under the action of gravity, so as to reduce the negative pressure suction load. In the first processing posture, the flipping frame 3 is rotated 180° relative to the second processing posture. In the first processing posture, the milling axis 307 is located below the horizontal rotation axis of the flipping frame 3, while the dual-axis clamping mechanism is located above the horizontal rotation axis of the flipping frame 3. In this way, the flipping frame 3 is relatively limited to the first processing posture, so that the milling axis 307 is located below the dual-axis clamping mechanism. In this state, the opening of the negative pressure suction hood 309 faces upward, aligned with the milling area above, making it easy to receive and suck up the waste chips and waste liquid falling downward under the acceleration of gravity, with the highest chip removal efficiency. The cutting fluid in the water-cooled tank 4 is kept at a low level, which is lower than the working area of ​​the dual-axis clamping mechanism and the milling head 308, ensuring that the cutting fluid does not come into contact with the three-axis drive platform 302 or its structural components, thereby achieving stable dry milling. The three-axis drive platform 302 and its structural components adopt a waterproof sealing structure. It should be noted that the waterproof sealing structure of the three-axis drive platform 302 and its structural components is not a necessary condition for the first machining posture, but a conventional protective design to take into account the immersion machining condition when the workpiece is completely immersed in the cutting fluid in the second machining posture. In the second machining posture, the flipping frame 3 positions the milling axis 307 above the dual-axis clamping mechanism, and the workpiece 7 is fully immersed in the cutting fluid. The flipping frame 3 can flip around its horizontal axis within a range of 110° and maintain the milling process during the flipping. The vibrating frame 2 vibrates selectively during the flipping, and the fan 101 and the negative pressure suction hood 309 do not work at the same time.

[0025] In this embodiment, the second machining posture is a wet water immersion milling state. Its core design purpose is to completely immerse the workpiece 7 in the cutting fluid to achieve sufficient cooling and lubrication, while using the liquid environment to assist in chip removal. To achieve this objective, the flipping frame 3 first flips 180° around its horizontal axis relative to the first processing posture to complete the initial preparation; In the second machining posture, the milling axis 307 is located above the horizontal rotation axis of the tilting frame 3, while the dual-axis clamping mechanism is located below the horizontal rotation axis of the tilting frame 3. This relatively limits the milling axis 307 to be located above the dual-axis clamping mechanism in the second machining posture. Under this processing posture: The cutting fluid in the water-cooled box 4 is kept at a high level to ensure that the workpiece 7 is completely immersed in the cutting fluid. The heat generated during milling is quickly carried away by the cutting fluid, and at the same time, the cutting fluid penetrates into the interface between the tool tip and the chip to achieve effective lubrication. The workpiece 7 is immersed in the cutting fluid. The flipping frame 3 can dynamically flip around its horizontal axis within a range of 110°, so that the workpiece 7 changes its spatial posture in the cutting fluid. The core function of this flipping function is to make the curved sections and deep cavity dead corners in different directions in the flow channel in a posture that is conducive to chip removal. Combined with gravity, cutting fluid flow and the cavitation effect of the ultrasonic vibrator 401 at the bottom of the water-cooled box 4, the chips are removed from the depth of the flow channel and settled or discharged with the liquid flow, avoiding the accumulation and blockage of chips at the bends of the flow channel. During the 110° rotation, the milling process continues, and the central control host 103 coordinates the movement of each axis in real time based on the angle signal fed back by the encoder. During the flipping process, the vibration frame 2 is selectively activated based on the real-time parameters fed back by the vibration sensor 316, and only intervenes to disturb when chips accumulate or become entangled, thus avoiding ineffective vibration; The control unit includes a central control host 103 fixedly installed on the end face of the housing 1 and a vibration sensor 316 fixedly installed on the flipping frame 3. The servo motor 306, drive motor 5 and flipping motor 301 all have integrated encoders. The data terminals of the encoders and vibration sensor 316 are all connected to the central control host 103.

[0026] The central control unit 103 is configured as follows: In the first processing posture, the servo motor 306 speed signal and the flip motor 301 angle signal fed back by the encoder are obtained, and the vibration frame 2 real-time vibration parameters fed back by the vibration sensor 316 are obtained. Based on the real-time vibration parameters, it is determined whether the preset vibration threshold is reached. If it is not reached, the vibration generating mechanism is driven to start the compensation vibration, and the sewage suction pump 310 connected to the negative pressure suction hood 309 is turned on simultaneously. In the second processing posture, the real-time angle signal of the flip motor 301 fed back by the encoder is obtained. When the flip frame 3 flips around its horizontal axis, the flip angle is constrained within the range of 110°. The movement of each axis is coordinated according to the speed signal of the servo motor 306 and the speed signal of the drive motor 5 fed back by the encoder to maintain the milling processing state. Meanwhile, the central control unit 103 selectively starts or stops the vibration generating mechanism based on the real-time vibration parameters of the vibration frame 2 fed back by the vibration sensor 316; The central control unit 103 performs interlock control on the blower 101 and the negative pressure suction hood 309. When the blower 101 starts, the suction pump 310 connected to the negative pressure suction hood 309 is forcibly shut down. When the suction pump 310 starts, the blower 101 is forcibly shut down.

[0027] In a preferred embodiment, when the workpiece 7 is below the milling head 308 in a direction perpendicular to the horizontal plane, the tendency of the chips to fall naturally under gravity is weak, and the negative pressure suction hood 309 is located above the processing area in this posture, resulting in low suction efficiency. If it is forcibly opened, it is easy to cause waste chips to fly and block the hood opening. Therefore, the central control host 103 controls the suction pump 310 and the fan 101 to remain in the off state, and only relies on the cutting fluid spray and ultrasonic vibration to achieve basic cooling and chip removal. In the second processing posture, the tilting frame 3 is driven by the tilting motor 301 to rotate around the horizontal axis, causing the milling cutter head 308 to gradually swing towards the direction directly below the workpiece 7. According to the angle signal fed back by the encoder, the central control host 103 automatically starts the suction pump 310 when the milling cutter head 308 rotates to the direction directly below the horizontal rotation axis of the tilting frame 3. In this state, the negative pressure suction hood 309 is set directly below the workpiece 7, so that the negative pressure suction hood 309 performs concentrated suction when the milling cutter head 308 is facing the workpiece 7 from bottom to top, effectively removing the waste chips and residual cutting fluid generated by milling. Since the direction of gravity is consistent with the direction of suction at this time, the chip removal efficiency is the highest, and the opening area of ​​the negative pressure suction hood 309 is larger than the processing area required by the workpiece 7.

[0028] During the transition of the tilting frame 3 from the first posture to the second posture, and during the dynamic tilting of the tilting frame 3 around the horizontal axis within a range of 110° in the second posture, when the milling cutter head 308 deviates from the position directly below the horizontal rotation axis of the tilting frame 3 and is in an inclined or lateral position, i.e. not rotated directly below, the central control host 103 controls the suction pump 310 to be forcibly shut down, and at the same time starts the fan 101 to use the fan 101 to force ventilation and air exchange inside the housing 1, and extract the cutting fluid mist, high temperature steam and dust-containing gas dispersed in the processing area to maintain the cleanliness of the environment inside the housing 1 and reduce the temperature rise.

[0029] Throughout the switching process, the milling cutter head 308 rotates continuously without stopping. The central control host 103 executes strict interlock logic between the blower 101 and the sewage pump 310 based on the encoder angle signal of the flip motor 301 and the speed signal of the servo motor 306. Only one device is allowed to work at any given time, preventing both from starting at the same time and avoiding airflow interference and overload risks.

[0030] The specific steps for using this invention are as follows: Before the operation, the central control host 103 pre-stores the overall milling parameters of the flow channel to be processed and pre-edits the milling process and milling action. Before the operation starts, the cooling water jacket workpiece 7 is clamped and fixed by the dual-axis clamping mechanism. Then the control unit selects the working posture of the device. In the first processing posture, the tilting frame 3 rotates under the drive of the tilting motor 301, so that the milling axis 307 and the milling cutter head 308 are located below the workpiece 7. At this time, the device mainly performs milling processing under dry or micro-lubrication conditions. During the machining process, the three-axis drive platform 302 drives the milling base 305 to move precisely in the X, Y and Z directions, while the first rotary platform 304 can drive the milling axis 307 to rotate around its own axis to achieve multi-angle feed. At the same time, the drive motor 5 in the vibration generating mechanism receives the command from the central control host 103. When the central control host 103 controls the drive motor 5 to work, the drive motor 5 drives the drive shaft 501 and the wheel to rotate through the second synchronous belt. The three protrusions 502 on the wheel with different radial heights alternately push the rollers 503 on the vibration frame 2, so that the vibration frame 2 generates three different strokes of alternating amplitude vibration. This vibration is transmitted to the entire milling unit through the flipping frame 3, effectively disturbing and breaking the chips in the processing area, preventing them from entangled or adhering. In the first machining posture, the spraying mechanism is activated, and the pump body pumps the cutting fluid from the reservoir 318. The fluid flows through the flexible hose, the supply ring 319, and the flow channel inside the milling shaft 307, and is finally sprayed precisely onto the cutting area from the spray hole 311, which is close to the milling head 308 and inclined downward at 40°, to achieve cooling, lubrication and assist in chip removal. The negative pressure suction shroud 309, which is coaxially arranged with the milling shaft 307, continuously sucks up the waste chips and waste liquid washed out by vibration and cutting fluid under the action of the external sewage pump 310. In the second machining posture, the tilting frame 3 rotates so that the milling axis 307 is above the workpiece 7, and the workpiece 7 is completely immersed in the cutting fluid of the water cooling box 4 for wet milling. In this posture, the tilting frame 3 can rotate around the horizontal axis at a controllable angle within a range of 110°. At the same time, the three-axis drive platform 302, the first rotary platform 304 and the dual-axis clamping mechanism move in coordination to maintain the continuity of milling. The ultrasonic vibrating rod 401 array at the bottom of the water-cooled box 4 works periodically. Through the cavitation effect and microfluidic action of ultrasonic waves, it further promotes the cleaning of the workpiece 7 and the milling cutter head 308 by the cutting fluid and prevents the adhesion of fine chips. The integrated cooling module 402 actively cools the cutting fluid to maintain a constant temperature; Throughout the entire machining process, the ultrasonic vibration unit works independently. The ultrasonic transducer 314 drives the ultrasonic table 317 and the milling shaft 307 to generate axial high-frequency vibration, which reduces cutting force and cutting heat, and enhances the penetration and chip removal capabilities of the cutting fluid. The control unit coordinates all the above actions in real time using feedback data from the encoders and vibration sensors 316 integrated into each motor. In the first posture, the start and stop of the vibration generating mechanism are dynamically controlled according to the vibration parameters to compensate for the vibration effect; During the second posture flipping process, strictly according to the flipping angle signal, when the milling cutter head 308 is facing the workpiece 7 in a direction perpendicular to the horizontal plane, the negative pressure suction hood 309 is activated for efficient suction. When the milling cutter head 308 deviates from the direction perpendicular to the horizontal plane, the sewage pump 310 is turned off and the two side fans 101 are activated for ventilation. The fans 101 and the sewage pump 310 are interlocked to ensure that they do not work at the same time to avoid airflow interference. The first processing state is mainly applicable to the initial roughing of the cooling water jacket channel, the relatively simple shape, or the relatively open chip removal space. Effective chip removal and cooling can be achieved by relying on the concentrated suction of the negative pressure suction hood 309 and the directional spraying of cutting fluid. The second processing state is designed specifically for finishing complex spatial channels with deep cavities, multiple bends, and extremely difficult chip removal. The liquid environment and all-round immersion provide the ultimate heat dissipation for high-heat milling and lay the foundation for subsequent cleaning. In the first processing state, the control unit continuously monitors the real-time vibration parameters fed back by the vibration sensor 316. Only when it detects that the chips begin to wrap and accumulate or the sensor data is lower than the preset threshold, the drive motor 5 is started to drive the vibration frame 2 to generate amplitude vibration through the rotation of the wheel to disturb and break the chips. Once the data from the vibration sensor 316 returns to the normal range or the machining transitions to a simple contour stage with smooth chip removal, the vibration generating mechanism immediately shuts off. In the second machining state, the rotation frame 3 drives the workpiece 7 to perform large-angle rotation milling in the cutting fluid, and the machining position is in the dead corner of the flow channel or the bottom of the deep cavity, so as to use vibration to cooperate with the fluid flow to flush away the chips in the dead corner. When the workpiece 7 is in a position with low chip removal resistance, such as in horizontal or shallow cavity machining, the vibration generating mechanism remains closed. Through this intelligent criterion control based on real-time processing status and sensor feedback, the vibration generating mechanism intervenes only when necessary, avoiding ineffective operation during the chip removal phase or simple processing.

[0031] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A CNC milling device for cooling water jacket channels of marine diesel engines, comprising a housing, characterized in that: Fans are installed on both sides of the casing, and a vibrating frame is slidably mounted on the casing. A vibration generating mechanism is provided between the two, which drives the vibrating frame to vibrate alternately with three different stroke amplitudes. The vibration generating mechanism includes a drive motor fixedly mounted on the casing and a drive shaft rotatably mounted on the casing. A second synchronous belt is driven and mounted on the output shaft of the drive motor. The second synchronous belt is driven and connected to the drive shaft. A wheel is mounted on the outer circumferential surface of the drive shaft. Three protrusions with different radial heights are mounted on the outer circumferential surface of the wheel. Rollers are rotatably mounted on the vibrating frame. When the drive shaft is configured to rotate, the three protrusions alternately push the rollers. Two return springs are mounted on the bottom surface of the vibrating frame, and the bottom ends of the two return springs are fixedly connected to the casing. A tilting frame is rotatably mounted on the vibration frame. The tilting frame is selectively driven by a tilting motor and rotates around a horizontal axis. The upper part of the tilting frame is equipped with a three-axis drive platform, and the lower part is fixedly installed with a dual-axis clamping mechanism. A three-axis moving frame is connected to the three-axis drive platform. The surface of the three-axis moving frame is connected to a milling seat through a first rotary platform. A milling axis driven by a servo motor is installed on the milling seat. The vibration direction of the vibration frame is parallel to the axis of the milling axis. A milling cutter head is installed at the bottom of the milling axis. An ultrasonic vibration unit is installed on the milling cutter head. The workpiece is clamped on the dual-axis clamping mechanism. The ultrasonic vibration unit includes an ultrasonic vibration table slidably installed on the three-axis moving frame. The milling axis is rotatably installed on the ultrasonic vibration table through a bearing. A transmission shaft is fixedly installed on the output shaft of the servo motor. The transmission shaft has a spline socket with an open bottom end. The milling axis has a bonding section that is slidably connected to the spline socket. The cross-section of the spline socket and the bonding section is a regular hexagon. An ultrasonic transducer is installed on the ultrasonic vibration table. A return spring is installed between the ultrasonic vibration table and the three-axis moving frame. The milling base is also equipped with a negative pressure suction hood that is coaxially arranged with the milling shaft and connected to an external sewage pump. The outer circumferential surface of the milling shaft has a spray hole near the milling cutter head. A liquid injection mechanism for supplying liquid to the injection orifice; A water-cooled box is fixedly installed at the bottom of the casing. The water-cooled box contains cutting fluid, and ultrasonic vibrating rods are arranged in an array at the bottom of the water-cooled box. The control unit enables the device to selectively operate in either a first processing posture or a second processing posture. In the first machining posture, the tilting frame positions the milling axis below the dual-axis clamping mechanism, the vibrating frame vibrates in a controllable manner, and the negative pressure suction hood sucks up waste chips and waste liquid; In the second machining posture, the tilting frame positions the milling axis above the dual-axis clamping mechanism, and the workpiece is fully immersed in the cutting fluid. The tilting frame can rotate within a range of 110° around its horizontal axis and maintain the milling process during the rotation. The vibrating frame vibrates selectively during the rotation, and the fan and the negative pressure suction hood do not work at the same time.

2. The CNC milling device for the cooling water jacket flow channel of a marine diesel engine according to claim 1, characterized in that, Two door panels are slidably mounted on the end face of the housing. Each door panel has a transparent viewing window. A first synchronous belt is driven on the output shaft of the flipping motor. The first synchronous belt is connected to the flipping frame and is made of rubber.

3. The CNC milling device for the cooling water jacket flow channel of a marine diesel engine according to claim 1, characterized in that, The dual-axis clamping mechanism is used to drive the workpiece to deflect in two directions, and the two rotation directions of the dual-axis clamping mechanism are different from the rotation direction of the first rotary platform.

4. The CNC milling device for the cooling water jacket flow channel of a marine diesel engine according to claim 1, characterized in that, A corrugated sealing cover is fixedly installed on the outer periphery of the vibration frame, and the corrugated sealing cover is fixedly connected to the machine housing.

5. The CNC milling device for the cooling water jacket flow channel of a marine diesel engine according to claim 1, characterized in that, The spraying mechanism includes a liquid storage tank fixedly installed on the moving end of the three-axis drive platform. A pump body is installed at the bottom of the liquid storage tank. A flexible hose is connected to the outlet port of the pump body. A liquid supply ring is sealed on the milling shaft. The liquid supply ring is fixedly connected to the milling seat. The other end of the flexible hose is connected to the liquid supply ring. A flow channel is opened inside the milling shaft. A through hole is opened on the milling shaft at the position corresponding to the inner side of the liquid supply ring. The through hole and the spray hole are both connected to the flow channel. The spray hole is inclined downward towards the axis of the milling shaft, and the angle between the axis of the spray hole and the axis of the milling shaft is 40°.

6. The CNC milling device for the cooling water jacket flow channel of a marine diesel engine according to claim 1, characterized in that, The dual-axis clamping mechanism includes a positioning frame fixedly mounted on a flipping frame, a rotation frame rotatably mounted on the positioning frame via bearings, two rotary motors mounted on the positioning frame, the output shafts of the two rotary motors being fixedly connected to the rotation frame, a second rotary platform rotatably mounted on the rotation frame, and a clamp mounted on the second rotary platform.

7. The CNC milling device for the cooling water jacket flow channel of a marine diesel engine according to claim 1, characterized in that, The water-cooled box is equipped with an integrated refrigeration module, and a drain valve is connected to the bottom of the water-cooled box.

8. The CNC milling device for the cooling water jacket flow channel of a marine diesel engine according to claim 1, characterized in that, The control unit includes a central control host fixedly installed on the end face of the housing and a vibration sensor fixedly installed on the tilting frame. The servo motor, drive motor and tilting motor all have integrated encoders. The data terminals of the encoders and vibration sensors are all connected to the central control host.

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