Special numerical control machining boring and milling machine tool for movable oversized complex special-shaped curved surface

Abstract

The invention discloses a special numerical control machining boring and milling machine tool for a movable oversized complex special-shaped curved surface, and relates to the field of machining of hydropower station runners, the special numerical control machining boring and milling machine tool comprises a machine tool body, a middle shaft and two lifting shafts are arranged in the machine tool body, and the two lifting shafts are symmetrically distributed on the left side and the right side of the middle shaft; the front ends and the rear ends of the middle shaft and the two lifting shafts penetrate through the front side and the rear side of the lathe bed and extend to the front side and the rear side of the lathe bed, two symmetrically-distributed unloading beams are fixedly connected to the positions, located on the front side and the rear side of the lathe bed, of the outer surfaces of the two lifting shafts, and the unloading beams are fixedly connected to the outer surface of the middle shaft. By means of mutual cooperation of the four lifting shafts, the middle shaft, the unloading beam and the lifting steel wire rope in the machine tool, the whole machine tool can be conveniently transported and moved in a lifting mode, the unloading beam is matched with the lifting shafts and the middle shaft, and the situation that the machine tool locally bears huge tension and deforms and is damaged during lifting can be avoided.

Description

Technical Field

[0001] The invention relates to the field of processing of a runner of a hydropower station, and in particular to a movable special-purpose numerically controlled boring and milling machine tool for processing super-large complex and special-shaped curved surfaces. Background Art

[0002] Large impact impellers are the main components of hydropower station generators. With the development of science and technology, the power generation of hydropower station generators is getting bigger and bigger, the size of the impeller is getting bigger and bigger, and people have higher and higher requirements for the processing of the impeller.

[0003] The existing general-purpose CNC floor-standing milling and boring machines used for processing large impact wheel buckets can meet the processing requirements, but most of them are processed by a single machine tool, and the processing efficiency is low. In order to improve the processing efficiency, some processing plants use multiple machine tools to process the buckets around the wheel at the same time. However, due to the heavy weight of the bed of the existing heavy machine tools, the machine tools are easily damaged due to huge local tension when they are lifted and transported as a whole, and precision adjustment is required after installation. The adjustment and testing cycle is long, which limits its application in a fast processing environment. Therefore, a movable CNC boring and milling machine tool specially used for processing large and complex special-shaped surfaces is proposed to solve the above-mentioned problems. Summary of the invention

[0004] In order to solve the above technical problems, a movable CNC boring and milling machine tool for processing large complex and special-shaped surfaces is provided. The technical solution solves the problem that the existing general-purpose CNC floor-standing milling and boring machine for processing large impact wheel water buckets proposed in the above background technology can meet the processing requirements, but most of them are processed by a single machine tool, and the processing efficiency is low. In order to improve the processing efficiency, some processing plants use multiple machine tools to process the water buckets around the wheel at the same time. However, due to the heavy weight of the bed of the existing heavy machine tools, when the overall lifting and transportation are carried out, the machine tools are easily damaged due to huge local tension, and precision adjustment is required after installation. The adjustment and testing cycle is long, which limits its application in a fast processing environment.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is: A movable CNC boring and milling machine tool for super-large complex and special-shaped curved surfaces comprises a bed, wherein an intermediate shaft and two lifting shafts are arranged inside the bed, wherein the two lifting shafts are symmetrically distributed on the left and right sides of the intermediate shaft, wherein the intermediate shaft and the front and rear ends of the two lifting shafts penetrate the front and rear sides of the bed, and extend to the front and rear sides of the bed, wherein the outer surfaces of the two lifting shafts are located at the front and rear sides of the bed and are fixedly connected with two symmetrically distributed unloading beams, wherein the unloading beams are fixedly connected to the outer surface of the intermediate shaft, and the upper end of the bed is slidably connected with a slide seat, wherein the slide seat is slidably connected to the upper end of the bed ... The upper end of the seat is fixedly connected to two symmetrically distributed columns, the upper ends of the two columns are fixedly connected to a top frame, the upper end of the top frame is fixedly installed with two first motors, the output end of the first motor passes through the upper end of the top frame and is fixedly connected to a first ball screw, the outer surface of the first ball screw is threadedly connected to the first movable seat, a spindle box is fixedly connected between the two first movable seats, the left and right sides of the spindle box are respectively slidably connected to the inner sides of the two columns, the interior of the spindle box is slidably connected to a ram, and a universal swing milling head is arranged at the front end of the ram.

[0006] Preferably, the upper end of the slide is located between the two columns and four evenly distributed balancing cylinders are fixedly installed thereon, and the spindle box is fixedly connected to the outer surface of the output end of the balancing cylinder.

[0007] Preferably, the outer surfaces of the two front lifting shafts and the two rear lifting shafts are both sleeved with lifting wire ropes.

[0008] Preferably, the rear end of the spindle box is located at the lower end of the slide and a second motor is fixedly installed thereon. The output end of the second motor passes through the rear end of the spindle box and is fixedly connected to a second ball screw. The outer surface of the second ball screw is threadedly connected to a second movable seat, and the upper end of the second movable seat is fixedly connected to the lower end of the slide.

[0009] Preferably, a third motor is fixedly installed at the rear end of the slide, and the output end of the third motor is fixedly connected to a connecting shaft. The other end of the connecting shaft passes through the rear end of the slide and extends to the front end of the slide and is fixedly connected to a mounting seat, and the front end of the mounting seat is fixedly connected to the rear end of the universal swing milling head.

[0010] Preferably, a fourth motor is fixedly installed on the left end of the bed, the output end of the fourth motor is fixedly connected to a third ball screw, the outer surface of the third ball screw is threadedly connected to a third movable seat, and the right end of the third movable seat is fixedly connected to the left end of the slide seat.

[0011] Preferably, the front and rear ends of the top frame are fixedly connected to two symmetrically distributed protection blocks, and arc-shaped grooves are provided at the ends of the front protection block and the two rear protection blocks that are away from each other, and the lifting wire rope abuts against the inner wall of the arc-shaped groove.

[0012] Compared with the prior art, the present invention has the following beneficial effects: This scheme proposes a movable CNC boring and milling machine tool for super-large complex and special-shaped surfaces. Through the mutual cooperation of the four lifting shafts, the intermediate shaft, the unloading beam and the lifting wire rope in the machine tool, the whole machine can be conveniently transported and relocated by lifting. The unloading beam cooperates with the lifting shaft and the intermediate shaft to avoid the local deformation and damage of the machine tool due to huge tension during lifting. Combined with the balancing cylinder and the displacement sensor, the center of gravity of the spindle box can be compensated in real time during the use of the machine tool, ensuring that the machine tool does not produce errors caused by the center of gravity shift during the processing, thereby improving the processing accuracy. The self-adjustable universal swing milling head is used in conjunction with multiple ball screws and slides to achieve precise processing of complex and special-shaped surfaces. The power supply design in the form of an aviation socket simplifies the installation and debugging time of the machine tool and greatly improves the maneuverability and use efficiency of the machine tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 is a connection diagram of the first ball screw in the present invention; Figure 3 It is a connection schematic diagram of the balancing oil cylinder in the present invention; Figure 4 is a connection diagram of the third ball screw in the present invention; Figure 5 It is a structural schematic diagram of the ram in the present invention.

[0014] The numbers in the figure are: 1. Bed; 2. Lifting shaft; 3. Intermediate shaft; 4. Unloading beam; 5. Slide; 6. Column; 7. Top frame; 8. First motor; 9. First ball screw; 901. First moving seat; 10. Spindle box; 11. Slide; 12. Universal swing milling head; 13. Balancing cylinder; 14. Lifting wire rope; 15. Protective block; 16. Second motor; 17. Second ball screw; 18. Second moving seat; 19. Third motor; 20. Connecting shaft; 21. Mounting seat; 22. Fourth motor; 23. Third ball screw; 24. Third moving seat. DETAILED DESCRIPTION

[0015] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0016] Reference Figure 1-Figure 5As shown, a movable CNC boring and milling machine tool for super-large complex and special-shaped curved surfaces includes a bed 1, an intermediate shaft 3 and two lifting shafts 2 are arranged inside the bed 1, and the two lifting shafts 2 are symmetrically distributed on the left and right sides of the intermediate shaft 3. The front and rear ends of the intermediate shaft 3 and the two lifting shafts 2 pass through the front and rear sides of the bed 1 and extend to the front and rear sides of the bed 1. The outer surfaces of the two lifting shafts 2 are located at the front and rear sides of the bed 1 and are fixedly connected with two symmetrically distributed unloading beams 4. The unloading beams 4 are fixedly connected to the outer surface of the intermediate shaft 3. The upper end of the bed 1 is slidably connected with a slide seat 5, and the upper end of the slide seat 5 There are two symmetrically distributed columns 6 fixedly connected, the upper ends of the two columns 6 are fixedly connected with a top frame 7, the upper end of the top frame 7 is fixedly installed with two first motors 8, the output end of the first motor 8 passes through the upper end of the top frame 7 and is fixedly connected with a first ball screw 9, the outer surface of the first ball screw 9 is threadedly connected to the first movable seat 901, and a spindle box 10 is fixedly connected between the two first movable seats 901, and the left and right sides of the spindle box 10 are respectively slidably connected to the inner sides of the two columns 6, and the interior of the spindle box 10 is slidably connected with a slide 11, and a universal swing milling head 12 is arranged at the front end of the slide 11.

[0017] Furthermore, the outer surfaces of the two front lifting shafts 2 and the two rear lifting shafts 2 are sleeved with lifting wire ropes 14, and the front and rear ends of the top frame 7 are fixedly connected to two symmetrically distributed protective blocks 15. The front protective block 15 and the two rear protective blocks 15 are provided with arc-shaped grooves at the ends away from each other, and the lifting wire ropes 14 abut against the inner walls of the arc-shaped grooves.

[0018] Furthermore, a lifting wire rope 14 is sleeved on the outer surface of the lifting shaft 2 for connecting with the lifting equipment, so as to lift the entire machine tool. The middle diameter of the parts at the front and rear ends of the lifting shaft 2 for connecting with the lifting wire rope 14 is smaller than the diameters at both sides. The part with the smaller middle diameter is used to contact the lifting wire rope 14, while the parts with the larger diameters on both sides are respectively located on both sides of the lifting wire rope 14, for limiting the lifting wire rope 14 to prevent the lifting wire rope 14 from slipping off the outer surface of the lifting shaft 2 during the lifting process. The two ends of the front and rear lifting wire ropes 14 are respectively fixed on the two lifting shafts 2, and the middle part extends to the upper end of the top frame 7 to be connected with the lifting equipment. Since the two lifting wire ropes 14 are connected to the same lifting equipment, the connection path of the lifting wire rope 14 gradually shrinks inward from bottom to top, and the lifting wire rope 14 will come into contact with the side of the top frame 7. In order to avoid friction between the lifting wire rope 14 and the side of the top frame 7 The friction causes the lifting wire rope 14 to wear. Protective blocks 15 are provided on the front and rear sides of the top frame 7 on the connection path of the lifting wire rope 14. The arc-shaped groove on the protective block 15 has smooth edges and no edges and corners, which can reduce the friction damage to the lifting wire rope 14. At the same time, the part of the lifting wire rope 14 that contacts the protective block 15 is located in the middle position of the arc-shaped groove. When the lifting wire rope 14 is located in the middle position of the groove, both sides of it are symmetrically supported by the groove to form a balanced state. Under this balance, the lifting wire rope 14 will not deviate to the two ends of the groove. If the lifting wire rope 14 deviates from the center, the lifting wire rope 14 will be naturally guided by the arc, forcing it to return to the center area to avoid sliding. Therefore, the design of the arc-shaped groove can reduce the friction damage to the lifting wire rope 14, and can also enable the lifting wire rope 14 to maintain the correct trajectory during the lifting process to avoid displacement due to unstable position.

[0019] Furthermore, the lifting shaft 2 and the intermediate shaft 3 both pass through the bed 1 and are connected to the unloading beam 4, wherein the intermediate shaft 3 is fixedly connected to the bed 1, and there is a certain gap between the lifting shaft 2 and the bed 1. When the entire machine tool is lifted, since there is a gap between the lifting shaft 2 and the bed 1 and the intermediate shaft 3 is fixedly connected to the bed 1, the bed 1 in the intermediate shaft 3 area is first subjected to force. As the lifting shaft 2 is pulled up, the unloading beam 4 is bent and deformed, and the force on the bed 1 in the intermediate shaft 3 area gradually increases. After the lifting shafts 2 at both ends contact the bed 1, the entire machine tool is in a lifting state. At this time, the upward force at the position of the intermediate shaft 3 is greater than the upward force at the positions of the lifting shafts 2 at both ends. This just overcomes the force of the bed 1 being deflected in the middle due to the lifting at both ends, thereby keeping the bed 1 straight when the entire machine tool is lifted.

[0020] Furthermore, the four lifting shafts 2, the intermediate shaft 3, the unloading beam 4 and the lifting wire rope 14 in the machine tool cooperate with each other, so that the whole machine can be conveniently transported and relocated by lifting. The unloading beam 4 cooperates with the lifting shaft 2 and the intermediate shaft 3 to avoid the local part of the machine tool being deformed and damaged due to huge tension during lifting, which facilitates the lifting and transportation of the whole machine tool and improves the maneuverability of the machine tool processing.

[0021] Furthermore, four evenly distributed balancing cylinders 13 are fixedly installed on the upper end of the slide 5 between the two columns 6 , and the spindle box 10 is fixedly connected to the outer surface of the output end of the balancing cylinder 13 .

[0022] Furthermore, as the slide 11 is extended, the length of the slide 11 on the front and rear sides of the spindle box 10 will change. At this time, the center of gravity of the spindle box 10 will shift, causing the head of the slide 11 to sag downward. The above problem can be effectively avoided by using the two first ball screws 9 combined with the balancing cylinder 13 tracking compensation structure.

[0023] Furthermore, the spindle box 10 is arranged vertically to the front and rear of the first ball screw 9, and a displacement sensor is provided at the upper end of the slide 11 located at the rear side of the spindle box 10 to measure the distance between the rear end of the slide 11 and the rear end of the spindle box 10. Since the length of the slide 11 is fixed, the distance between the other side of the slide 11 and the front end of the spindle box 10 can be calculated by measuring the distance between one side of the slide 11 and the spindle box 10. The position difference of the slide 11 on the front and rear sides of the spindle box 10 is monitored by the displacement sensor and the data is transmitted to an external control system to form a feedback mechanism. The control system can calculate the weight deviation value of the spindle box 10 caused by the extension of the slide 11 according to the position difference of the slide 11 before and after. A total of four sets of balancing cylinders 13 are arranged before and after the spindle box 10. The control system automatically adjusts the oil pressure of the front and rear balancing cylinders 13 according to the calculated weight deviation value, and can compensate for the weight deviation caused by the position difference of the slide 11 in real time.

[0024] Furthermore, the balancing cylinder 13 is adjusted through oil pressure to balance the front and rear of the spindle box 10, thereby reducing the offset effect of the center of gravity of the spindle box 10 caused by the extension of the slide 11. The connecting part of the balancing cylinder 13 and the spindle box 10 is designed as an adjustable cylinder. The cylinders are connected to the electro-hydraulic proportional valve through hydraulic pipes. The electro-hydraulic proportional valve, as the core component of the cylinder oil pressure control, adjusts the oil pressure through electrical signals to accurately control the extension and contraction of the cylinder. The electro-hydraulic proportional valve can finely adjust the oil pressure of the front and rear cylinders according to the feedback signal of the control system to balance the center of gravity of the spindle box 10 and correct the offset in real time. When compensating, the balancing cylinder 13 can not only make up for the center of gravity offset caused by the extension of the slide 11, but also bear most of the weight of the spindle box 10. Since the balancing cylinder 13 bears the load of the spindle box 10, it can effectively reduce the burden of the first ball screw 9, reduce the external force borne by the first ball screw 9, thereby reducing the wear of the first ball screw 9 and increasing its service life.

[0025] Furthermore, a second motor 16 is fixedly installed at the rear end of the spindle box 10 and located at the lower end of the slide 11. The output end of the second motor 16 passes through the rear end of the spindle box 10 and is fixedly connected to a second ball screw 17. The outer surface of the second ball screw 17 is threadedly connected to a second movable seat 18. The upper end of the second movable seat 18 is fixedly connected to the lower end of the slide 11.

[0026] Furthermore, a third motor 19 is fixedly installed at the rear end of the slide 11, and a connecting shaft 20 is fixedly connected to the output end of the third motor 19. The other end of the connecting shaft 20 passes through the rear end of the slide 11 and extends to the front end of the slide 11 and is fixedly connected to a mounting seat 21. The front end of the mounting seat 21 is fixedly connected to the rear end of the universal swing milling head 12.

[0027] Furthermore, a fourth motor 22 is fixedly installed on the left end of the bed 1, and the output end of the fourth motor 22 is fixedly connected to a third ball screw 23, the outer surface of the third ball screw 23 is threadedly connected to a third movable seat 24, and the right end of the third movable seat 24 is fixedly connected to the left end of the slide seat 5.

[0028] Furthermore, the fourth motor 22 is used to drive the third ball screw 23 to rotate. During the rotation of the third ball screw 23, the third moving seat 24 will drive the slide 5 to slide along the outer surface of the third ball screw 23. Since the third moving seat 24 is fixedly connected to the slide 5, the movement of the third moving seat 24 will drive the slide 5 to slide left and right along the bed 1, and then drive the universal swing milling head 12 to move left and right for position adjustment.

[0029] Furthermore, the first motor 8 is used to drive the first ball screw 9 to rotate. During the rotation, the first ball screw 9 will drive the spindle box 10 to slide along the outer surface of the first ball screw 9, thereby driving the universal swing milling head 12 to move in the vertical direction, thereby adjusting the vertical position of the universal swing milling head 12.

[0030] Furthermore, the second motor 16 is used to drive the second ball screw 17 to rotate. During the rotation, the second ball screw 17 will drive the second moving seat 18 to slide along the outer surface of the second ball screw 17. Since the second moving seat 18 is fixedly connected to the slide 11, the movement of the second moving seat 18 will drive the slide 11 to move forward and backward, thereby adjusting the position of the universal swing milling head 12 to move forward and backward.

[0031] Furthermore, the third motor 19 is used to drive the connecting shaft 20 to rotate, and the universal swing milling head 12 is installed on the mounting seat 21 of the connecting shaft 20. When the third motor 19 drives the connecting shaft 20 to rotate, it can drive the universal swing milling head 12 to rotate and adjust the angle.

[0032] Furthermore, the universal swing milling head 12 itself has a rotatable structure, including a group of bearing systems that support rotation, allowing the milling head to perform precise angle adjustment on the horizontal and vertical planes. Through a motor or manual control mechanism, the milling head can rotate along multiple axes to meet different processing requirements. The main components of the rotating mechanism include a rotating base, a rotating axis and a milling cutter mounting portion and a locking device for fixing the milling head angle. The milling cutter mounting component of the milling head body is connected to the tool through a precise chuck or tool holder system. It can install different types of milling cutters, such as flat milling cutters, angle milling cutters and ball head milling cutters, etc. according to the specific requirements of the processing to adapt to the processing of special-shaped curved surfaces. The mounting component can stably maintain the precise position of the milling cutter and prevent the milling cutter from loosening due to vibration or excessive load during operation. The universal swing milling head 12 realizes the angle adjustment function through a built-in servo motor and a mechanical drive mechanism, and can flexibly adjust the milling cutter angle in multiple directions. These mechanisms include an adjustment motor, an angle sensor and a synchronous belt or gear transmission device to ensure the accuracy of each angle adjustment. This structure can enable the milling cutter to maintain a predetermined processing angle during operation to ensure processing accuracy. The adjustment mechanism is precisely designed and has good repeat positioning accuracy. In order to ensure the stability of the position of the milling head after the angle is adjusted, the universal swing milling head 12 is equipped with an angle locking device. Once the milling head reaches the required angle, the locking device will fix the position of the milling head to prevent position deviation during processing. The locking device is usually composed of a hydraulic or mechanical locking device, which can withstand a large processing force to ensure stability during processing. In view of the high-speed rotation and high-load processing requirements, the universal swing milling head 12 is equipped with a cooling and lubrication system. This system can provide coolant in the milling cutter area to reduce the heat generated by friction and extend the service life of the equipment. The coolant is sent to the contact point between the milling cutter and the workpiece through a pipeline to ensure thermal stability during processing and improve processing accuracy. The rotatable structure of the universal swing milling head 12 body enables the machine tool to perform all-round angle adjustment when processing special-shaped surfaces, thereby adapting to workpieces of different shapes, sizes and processing difficulties. It can process complex surfaces such as spherical surfaces and conical surfaces to meet a variety of complex processing requirements. Through precise rotation and adjustment mechanisms, the milling head can ensure processing accuracy and surface finish, and avoid errors caused by inappropriate angles.

[0033] Furthermore, multiple ball screws, motors and moving seats cooperate with each other to adjust the position and rotate the universal swing milling head 12. Combined with the rotatability of the universal swing milling head 12 itself, precise adjustment of the position of the universal swing milling head 12 can be achieved, ensuring that the milling head can maintain a high degree of precision during the processing, thereby being able to cope with the processing of complex special-shaped surfaces and being able to be flexibly adjusted according to the geometric shape of the workpiece.

[0034] Furthermore, in addition to the above structure, the machine tool is also provided with a numerical control system, an electric control cabinet and a hydraulic station. The numerical control system is responsible for controlling the working state and motion trajectory of each component of the machine tool. The numerical control system calculates the precise movements of each component such as the moving seat, the spindle box 10 and the ball screw by receiving the input program instructions, so that the machine tool can perform processing operations according to the predetermined path and speed. At the same time, it also coordinates various motors, hydraulic systems and sensors to ensure the accuracy and efficiency of processing. The electric control cabinet is used to centrally manage and control the power supply and signal transmission of the machine tool. It includes power control, protection circuit and control panel, etc., to ensure the normal operation of each component of the machine tool and ensure that the machine tool is in good working order when a failure occurs. It can stop working in time to avoid damage. The hydraulic station provides power for the hydraulic system of the machine tool, which is mainly used to drive the balancing cylinder 13 and adjust the oil pressure, etc. It provides stable oil pressure support and can adjust the pressure of the hydraulic cylinder in real time according to the instructions of the control system to ensure the balance of the spindle box 10 and other components, and reduce the center of gravity offset problem caused by the extension of the slide 11, thereby improving the processing accuracy and stability. All of the above are connected to the external power supply through the aviation socket, and can be powered on and started quickly and conveniently. This access method simplifies the process of equipment installation and disassembly, improves the operability and mobility of the machine tool, and makes the machine tool suitable for working environments that require frequent relocation.

[0035] Furthermore, the motors in this solution are all servo motors, which are electrically connected to the control system. Through the precise control of the operation of the servo motor by the control system, the precise adjustment of the position of the milling head can be achieved.

[0036] Working principle: When the machine tool needs to be moved, first, fix the two ends of the two lifting wire ropes 14 to the two lifting shafts 2 on the front and rear sides of the bed 1 respectively, and then connect the middle parts of the two lifting wire ropes 14 to the lifting equipment, lift the entire machine tool through the lifting equipment, and then move it to the installation position. During the lifting process, since there is a gap between the lifting shaft 2 and the bed 1, and the intermediate shaft 3 and the bed 1 are fixedly connected, the bed 1 in the intermediate shaft 3 area is first subjected to force. As the lifting shaft 2 is pulled up, the unloading beam 4 is bent and deformed, and the force on the bed 1 in the intermediate shaft 3 area gradually increases. After the lifting shafts 2 at both ends contact the bed 1, the entire machine tool is in a lifting state. At this time, the upward force at the position of the intermediate shaft 3 is greater than that at the two ends. The upward force at the position of the hanging shaft 2 just overcomes the force of the bed 1 being bent downward in the middle due to the lifting of both ends, so that the bed 1 remains straight when the entire machine tool is lifted, and can avoid the machine tool being locally subjected to huge tension and deformed and damaged during lifting, which is convenient for lifting and transportation of the entire machine tool and improves the maneuverability of the machine tool processing. After the machine tool is moved to the installation position for installation and fixation, since the CNC system, electric control cabinet and hydraulic station on the machine tool are all connected to the power supply in the form of aviation sockets, they can be powered on by simple socket-type connections. After the machine tool is powered on, the processing parameters are entered into the control system, and the control system will automatically drive the machine tool to operate, and the third ball screw 23 is driven to rotate by the fourth motor 22, which can drive the third moving seat 24 along the third The outer surface of the ball screw 23 slides, thereby driving the universal swing milling head 12 to move left and right for position adjustment. The first motor 8 drives the first ball screw 9 to rotate, which can drive the spindle box 10 to slide along the outer surface of the first ball screw 9 to adjust the vertical position of the universal swing milling head 12. The second motor 16 drives the second ball screw 17 to rotate, which can drive the second moving seat 18 to slide along the outer surface of the second ball screw 17 to adjust the position of the universal swing milling head 12 moving forward and backward. The third motor 19 drives the connecting shaft 20 to rotate, which can drive the universal swing milling head 12 to rotate and adjust the angle. Through the above adjustment and the rotating structure of the universal swing milling head 12 itself, the milling cutter can be driven along a preset trajectory. The workpiece is processed accurately, when the first motor 8 drives the first ball screw 9 to adjust the vertical position of the universal swing milling head 12, the displacement sensor on the slide 11 will monitor the position difference of the slide 11 on the front and rear sides of the spindle box 10 in real time and transmit the data to the control system to form a feedback mechanism. The control system can calculate the weight deviation of the spindle box 10 caused by the extension of the slide 11 according to the position difference of the slide 11 before and after. A total of four sets of balancing cylinders 13 are arranged in front and behind the spindle box 10. The control system automatically adjusts the oil pressure of the front and rear balancing cylinders 13 according to the calculated weight deviation value, and can compensate for the weight deviation caused by the position difference of the slide 11 in real time, adjust the oil pressure to keep the front and rear balance of the spindle box 10, and avoid processing errors caused by the center of gravity shift.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A movable CNC boring and milling machine tool for processing large, complex and special-shaped curved surfaces, characterized in that: The invention comprises a bed (1), wherein an intermediate shaft (3) and two lifting shafts (2) are arranged inside the bed (1), and the two lifting shafts (2) are symmetrically distributed on the left and right sides of the intermediate shaft (3), and the front and rear ends of the intermediate shaft (3) and the two lifting shafts (2) penetrate the front and rear sides of the bed (1) and extend to the front and rear sides of the bed (1), and the outer surfaces of the two lifting shafts (2) are located at the front and rear sides of the bed (1) and are fixedly connected to two symmetrically distributed unloading beams (4), and the unloading beams (4) are fixedly connected to the outer surface of the intermediate shaft (3), and the upper end of the bed (1) is slidably connected to a slide seat (5), and the upper end of the slide seat (5) is fixedly connected to two symmetrically distributed vertical The upper ends of the two columns (6) are fixedly connected to a top frame (7), and the upper ends of the top frame (7) are fixedly installed with two first motors (8), the output end of the first motor (8) passes through the upper end of the top frame (7) and is fixedly connected to a first ball screw (9), the outer surface of the first ball screw (9) is threadedly connected to a first movable seat (901), and a spindle box (10) is fixedly connected between the two first movable seats (901), the left and right sides of the spindle box (10) are respectively slidably connected to the inner sides of the two columns (6), the interior of the spindle box (10) is slidably connected to a ram (11), and a universal swing milling head (12) is arranged at the front end of the ram (11).

2. The movable CNC boring and milling machine tool for processing large, complex and special-shaped curved surfaces according to claim 1 is characterized in that: The upper end of the slide seat (5) is located between the two upright posts (6) and is fixedly mounted with four evenly distributed balancing oil cylinders (13); the spindle box (10) is fixedly connected to the outer surface of the output end of the balancing oil cylinder (13).

3. The movable CNC boring and milling machine tool for processing large, complex and special-shaped curved surfaces according to claim 1 is characterized in that: The outer surfaces of the two lifting shafts (2) at the front side and the two lifting shafts (2) at the rear side are both sleeved with lifting steel wire ropes (14).

4. The movable CNC boring and milling machine tool for processing large, complex and special-shaped curved surfaces according to claim 1 is characterized in that: The rear end of the spindle box (10) is located at the lower end of the ram (11) and is fixedly mounted with a second motor (16); the output end of the second motor (16) passes through the rear end of the spindle box (10) and is fixedly connected to a second ball screw (17); the outer surface of the second ball screw (17) is threadedly connected to a second movable seat (18); the upper end of the second movable seat (18) is fixedly connected to the lower end of the ram (11).

5. The movable CNC boring and milling machine tool for processing large, complex and special-shaped curved surfaces according to claim 1 is characterized in that: A third motor (19) is fixedly mounted on the rear end of the ram (11); an output end of the third motor (19) is fixedly connected to a connecting shaft (20); the other end of the connecting shaft (20) passes through the rear end of the ram (11), extends to the front end of the ram (11) and is fixedly connected to a mounting seat (21); the front end of the mounting seat (21) is fixedly connected to the rear end of the universal swing milling head (12).

6. The movable CNC boring and milling machine tool for processing large, complex and special-shaped curved surfaces according to claim 1 is characterized in that: A fourth motor (22) is fixedly mounted on the left end of the bed (1); the output end of the fourth motor (22) is fixedly connected to a third ball screw (23); the outer surface of the third ball screw (23) is threadedly connected to a third movable seat (24); and the right end of the third movable seat (24) is fixedly connected to the left end of the slide seat (5).

7. The movable CNC boring and milling machine tool for processing large, complex and special-shaped curved surfaces according to claim 1 is characterized by: The front and rear ends of the top frame (7) are fixedly connected to two symmetrically distributed protection blocks (15), and the ends of the front protection block (15) and the two rear protection blocks (15) that are away from each other are provided with arc-shaped grooves, and the lifting wire rope (14) abuts against the inner wall of the arc-shaped groove.

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