Double-beam numerical control planer type boring and milling machine

Abstract

This invention discloses a double-beam CNC gantry milling machine, belonging to the field of milling machine technology. It includes: a support frame; a placement plate fixedly mounted on the upper surface of the support frame; an insertion port on the upper surface of the placement plate; an insertion port for a loading / unloading mechanism to be inserted into and to lift the plate placed on the upper surface of the placement plate; loading / unloading mechanisms fixedly mounted at both ends of the support frame; and U-shaped grooves on both ends of the upper surface of the placement plate, with clamping mechanisms slidably mounted at both ends of the U-shaped grooves. Through the design of the loading / unloading mechanism and the clamping mechanism, this application enables the plate to be clamped in mid-air, preventing the cutting tool from colliding with the placement plate during processing. This reduces collisions and friction between the cutting tool and the placement plate, lowers the risk of tool wear and damage, extends the tool's service life, and avoids processing accidents that may result from the cutting tool colliding with the placement plate.

Description

Technical Field

[0001] This invention relates to the field of milling machine technology, specifically to a double-beam CNC gantry milling machine. Background Technology

[0002] In the field of machining, CNC gantry milling machines are important processing equipment, and their performance directly affects the processing quality and production efficiency of products. Traditional CNC gantry milling machines have revealed many problems in practical applications, which urgently need to be improved.

[0003] During machining, the collision between the cutting tool and the mounting plate is a significant issue. For example, when performing operations such as perforation or hollowing on sheet metal, the cutting tool is highly likely to come into contact with the mounting plate. Traditional gantry milling machines, as mentioned in patent CN200920053846, suffer from significant cutting forces and vibrations during intermittent milling operations due to their structural design limitations. This is particularly true during the roughing of large parts, where the risk of tool-plate collision is high. This not only causes tool wear and damage, shortening tool life and increasing production costs, but may also lead to machining accidents, affecting the smooth progress of machining and product quality.

[0004] The clamping and positioning methods for sheet metal also have shortcomings. Traditional clamping mechanisms struggle to accurately adapt to the characteristics of different sheet metals, often resulting in uneven clamping force distribution when machining irregularly shaped parts. Taking the machining of large composite material components in the aerospace field as an example, such as the machine tool involved in patent CN201010101919, traditional clamping methods cannot effectively avoid problems such as thin-plate chatter and material surface damage when dealing with such complex workpieces, severely affecting machining accuracy and failing to meet the requirements of high-precision machining.

[0005] The low level of automation in the loading and unloading process is also a major challenge. Most traditional equipment relies on manual operation, which is labor-intensive and inefficient. For example, some milling machines require workers to manually move and adjust the position of sheet metal during loading and unloading. This not only consumes manpower and time, but is also prone to inaccurate positioning due to human factors, affecting processing accuracy. Furthermore, workers may suffer accidental injuries during frequent handling.

[0006] Furthermore, the debris generated during processing can easily damage the transmission components of the equipment. For example, as mentioned in patent CN201220618897, if the debris generated during processing of a traditional gantry milling machine enters the threaded rods or other transmission components of the first and second linear modules, it can cause blockage of the components, affect the transmission stability of the modules, and thus cause equipment malfunctions, reduce production efficiency, and increase equipment maintenance costs. Summary of the Invention

[0007] The purpose of this invention is to provide a double-beam CNC gantry milling machine to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A double-beam CNC gantry milling machine includes: a support frame, a placement plate fixedly mounted on the upper surface of the support frame, an insertion port on the upper surface of the placement plate, a loading and unloading mechanism that can be inserted into the insertion port and can lift the plate placed on the upper surface of the placement plate, and the loading and unloading mechanism is fixedly mounted on both ends of the support frame;

[0010] The upper surface of the placement plate is provided with a U-shaped sliding groove at both ends. A clamping mechanism is slidably installed at both ends of the U-shaped sliding groove. When the clamping mechanism is pulled back, it can touch one end of the inclined sliding surface, so that it can be pushed over and rotated into storage by the inclined sliding surface. The inclined sliding surface is opened at the lower end of the U-shaped sliding groove.

[0011] The placement plate has a first linear module fixedly installed at both ends. A U-shaped frame is fixedly installed between the moving blocks of the two sets of first linear modules. The U-shaped frame is suspended above the upper surface of the placement plate. A second linear module is fixedly installed inside the U-shaped frame. A third linear module is fixedly installed at one end of the moving block of the second linear module. A servo motor is fixedly installed at one end of the moving block of the third linear module.

[0012] Preferably, the outer surface of the threaded column of the first linear module and the second linear module is fitted with a folded rubber sleeve, and the two ends of the folded rubber sleeve are respectively fixedly connected to the two ends of the moving block of the first linear module and the second linear module.

[0013] Preferably, a first guide block is fixedly installed at both ends of the placement plate, a first guide block is slidably installed on the outer surface of the first guide block, and the first guide block is fixedly installed at both ends of the inner side of the U-shaped frame.

[0014] The second guide block is fixedly installed at one end of the U-shaped frame, and a second guide block is slidably installed on the outer surface of the second guide block. The second guide block is fixedly installed at one end of the third linear module.

[0015] Preferably, the clamping mechanism includes two sets of geared motors, which are fixedly installed at both ends of a U-shaped slide groove. One end of the output shaft of each set of geared motors is fixedly equipped with a forward screw and a reverse screw. The other end of the reverse screw is rotatably installed in an inclined sliding surface opened in the U-shaped slide groove. The outer surfaces of the forward screw and the reverse screw are threaded with a storage cylinder. The two sets of laterally opposite storage cylinders slide at both ends of the U-shaped slide groove. A triangular plate is slidably installed in the storage cylinder. The triangular plate can be driven by the forward screw or the reverse screw through the storage cylinder to contact the inclined sliding surface, thereby causing the triangular plate to be pushed and retracted into the storage cylinder by the inclined sliding surface through the power transmitted by the threaded rod.

[0016] The storage tube has a push spring fixedly connected to its upper inner surface, and the upper surface of the push spring is fixedly connected to the lower surface of the triangular plate.

[0017] Preferably, a first protective cylinder and a second protective cylinder are fixedly connected to one end of the inner side of each of the two sets of horizontally opposite storage cylinders, and the first protective cylinder is slidably sleeved on the outer surface of the second protective cylinder, and the first protective cylinder and the second protective cylinder are simultaneously fitted onto the outer surfaces of the forward screw and the reverse screw.

[0018] Preferably, each of the four sets of triangular plates has an opening at one end, and a rotating cylinder is rotatably installed in each of the four sets of openings. A set of clamping rods is fixedly installed between the two sets of vertically opposite rotating cylinders, so that the two sets of horizontally opposite clamping rods can be driven by two sets of forward screws and reverse screws to slide synchronously towards the middle or outward.

[0019] Preferably, a torsion spring is fixedly connected to one end of the ring opening, and the other end of the torsion spring is fixedly connected to one end of the ring opening, so that the torsion spring can apply a torsion force to the rotating cylinder and the clamping rod, so that the clamping rod can be driven to flip and abut against the straight end of the triangular plate, and can also be driven to touch the inclined sliding surface and flip 90° to be stored in the inlet-shaped sliding groove.

[0020] Preferably, the loading and unloading mechanism includes four sets of support rods. Each pair of support rods is fixedly installed at both ends of the bracket. A connecting plate is slidably installed inside each set of support rods. Both ends of the connecting plate slide out from inside the support rod, and an L-shaped frame is fixedly installed at each end. Multiple sets of rubber wheels are rotatably installed inside the L-shaped frame. Multiple sets of limiting wheels are rotatably installed on the outer surface of the connecting plate that slides inside the support rod segment. The multiple sets of limiting wheels respectively abut against both ends of the inner side of the support rod.

[0021] Preferably, a hydraulic rod is fixedly installed inside the support rod, and the upper surface of the piston rod of the hydraulic rod is fixedly installed on the lower surface of the connecting plate, so that the connecting plate can be driven by the hydraulic rod to insert the L-shaped frame into the insertion port, and at the same time, the rubber wheel rotating in the L-shaped frame can protrude from the surface of the placement plate.

[0022] Preferably, a dual-axis motor is fixedly installed on the upper surface of one of the L-shaped frames. A transmission disc is fixedly installed on the outer surface of the output shafts at both ends of the dual-axis motor. The outer surface of both sets of transmission discs is fitted with the first transmission belt. The other end of the two sets of first transmission belts is fitted into one end of the transmission disc in the two sets of L-shaped frames, where rubber wheels are rotatably installed. Multiple sets of second transmission belts are also fitted between the multiple sets of rubber wheels through the transmission discs, so that they can transmit synchronously and in the same direction.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. Through the design of the placement plate, insertion port, U-shaped slide groove, loading and unloading mechanism, and clamping mechanism, during use, the plate can be placed on the surface of the loading and unloading mechanism, which lifts the plate to the top of the placement plate. The other end of the loading and unloading mechanism rises and inserts into the insertion port. Then, the loading and unloading mechanism pushes the plate to the upper surface of the placement plate. The pushed plate will first fall onto the upper surface of the loading and unloading mechanism in the insertion port, allowing the loading and unloading mechanism in the insertion port to push the plate a second time. This allows the other end of the plate to be pushed and dragged onto the upper surface of the loading and unloading mechanism in another set of insertion ports. The two loading and unloading mechanisms then push the plate to the center of the placement plate and suspend it above the placement plate. The clamping mechanism can then slide towards the center within the U-shaped slide groove on the upper surface of the placement plate, clamping both ends of the suspended plate. The loading and unloading mechanism then descends and resets, leaving the plate suspended by the clamping mechanism. This allows the first linear module and the second linear module to... The module and the third linear module drive the movement trajectory of the milling cutter according to the processing path to process the sheet metal. Since the sheet metal is suspended, the cutter will not collide with the placement plate during processing, reducing collisions and friction between the cutter and the placement plate, lowering the risk of cutter wear and damage, extending the cutter's service life, and avoiding processing accidents that may be caused by the cutter colliding with the placement plate. If only surface processing or edge cutting of the sheet metal is required, the sheet metal can be supported on the surface of the placement plate and held in place by the clamping mechanism. Thus, depending on different processing requirements, the sheet metal can be either suspended or placed directly on the placement plate for processing. For processing operations such as perforation or hollowing that may cause the cutter to contact the placement plate, the loading and unloading mechanism suspends the sheet metal, effectively preventing the cutter from colliding with the placement plate and ensuring smooth processing. For cases involving only surface processing or edge cutting, the sheet metal can be directly supported on the placement plate and held in place by the clamping mechanism, making operation simple and convenient and improving processing efficiency.

[0025] During the process of driving the milling cutter, the first and second linear modules squeeze or stretch the folded rubber sleeve through the moving block. The folded rubber sleeve is fitted on the outer surface of the threaded rod of the first and second linear modules, which can prevent the milling cutter from clogging the threaded rod with debris when processing the plate. This can ensure the stability of the module transmission and ensure that the equipment can operate continuously and smoothly.

[0026] 2. Through the design of the geared motor, forward screw, reverse screw, storage cylinder, rotating cylinder, and clamping rod, when clamping the sheet metal, the two sets of geared motors can be started simultaneously to drive the forward and reverse screws to drive the storage cylinder, which is threaded on the outer surface, to slide out from the inclined sliding surface into the U-shaped groove. The storage cylinder, which slides into the U-shaped groove, allows the triangular plate to pop out from the storage cylinder by the spring force applied by the push spring. At the same time, the rotating cylinder, which is rotatably installed in the ring of the triangular plate, will also be twisted by the torsion spring, causing the clamping rod, which is fixed on the outer surface, to rotate and unfold by 90°. The popped-out and rotated triangular plate and clamping rod can then protrude from the U-shaped groove. With the continuous transmission of the geared motor, the horizontally opposite triangular plate and clamping rod can be driven to slide synchronously towards the center until they press against both ends of the sheet metal and stop. By sliding synchronously towards the center, the sheet metal can be pushed to the center position of the placement plate, thereby achieving the initial positioning of the sheet metal processing.

[0027] After processing, the geared motor can be reversed to drive the storage cylinder to slide from the U-shaped groove into the inclined surface, allowing the triangular plate and clamping rod to contact the inclined surface. This causes the clamping rod to rotate 90° and be stored in the U-shaped groove. Simultaneously, the rotating cylinder rotates the internally fixed torsion spring, which applies a restoring force to the clamping rod. As the triangular plate is continuously pulled and contacts the inclined surface, it compresses the push spring and slides into the storage cylinder. Storing the triangular plate and clamping rod in the U-shaped groove and storage cylinder prevents these components from interfering with other equipment parts or processing tools when not in use, reducing the risk of equipment damage due to collisions and friction, extending the equipment's service life, and allowing the clamping mechanism to be compactly stored when not in use, without occupying excessive space, making the machine tool's working area neater and more organized.

[0028] 3. Through the design of support rods, hydraulic rods, connecting plates, L-shaped frames, rubber wheels, dual-axis motors, and limit wheels, when the sheet material is lifted onto the surface of the placement plate, it can be placed on the upper surface of the lower L-shaped frame and rubber wheels. The hydraulic rods are then activated to push the connecting plate vertically upwards within the support rods via the limit wheels. The support rods can drive the L-shaped frames at both ends to align with the placement plate and insert it into the insertion slot. Subsequently, the dual-axis motor can be activated to drive one set of rubber wheels to rotate via the first transmission belt. The rubber wheels rotate within the L-shaped frame, and their upper surfaces pass through the surface of the L-shaped frame. The rotating rubber wheel can drive multiple sets of rubber wheels in the same direction through the second transmission belt, so that the board placed on the rubber wheel transmission surface can be transported onto the surface of the placement plate. The board that has been transported to the surface of the placement plate will be supported again on the surface of the rubber wheel of the L-shaped frame in the insertion port. This allows the rubber wheel in the insertion port to transport the board to the center of the placement plate for a second time. At the same time, the other end of the board will be pushed to the surface of the rubber wheel in the other insertion port and lifted up, thus achieving the purpose of lifting and feeding the board.

[0029] After the sheet material is processed, the rubber wheels can be used to slide the sheet material to one side onto the L-shaped frame surface at the outer end of the sheet material. Then, the hydraulic rod can be activated again to pull the L-shaped frame at both ends of the connecting plate to lower it, thus realizing the unloading of the sheet material. The loading and unloading process greatly reduces manual intervention, lowers the labor intensity of operators, and improves work efficiency. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the double-beam CNC gantry boring and milling machine of the present invention;

[0031] Figure 2 This is a schematic diagram of the placement plate of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the folding rubber sleeve of the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of the U-shaped frame of the present invention;

[0034] Figure 5 This is a schematic diagram of the clamping mechanism of the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of the rotating drum and clamping rod of the present invention;

[0036] Figure 7 This is a schematic diagram of the L-shaped frame and rubber wheel of the present invention;

[0037] Figure 8 This is a schematic diagram of the loading and unloading mechanism of the present invention.

[0038] In the diagram: 1. Bracket; 101. Placement plate; 102. Insertion port; 103. U-shaped slide groove; 104. First linear module; 105. U-shaped frame; 106. Third linear module; 107. Servo motor; 108. Second linear module; 109. Folding rubber sleeve; 110. First guide block; 111. Second guide block; 112. First guide block; 113. Second guide block; 114. Sloping slide surface; 2. Loading and unloading mechanism; 201. Support rod; 202. L-shaped frame; 203. 1. Dual-shaft motor; 204. First transmission belt; 205. Rubber wheel; 206. Second transmission belt; 207. Limit wheel; 208. Hydraulic rod; 209. Connecting plate; 3. Clamping mechanism; 301. Gear motor; 302. Forward screw; 303. Reverse screw; 304. First protective cylinder; 305. Second protective cylinder; 306. Storage cylinder; 307. Triangular plate; 308. Clamping rod; 309. Ring; 310. Torsion spring; 311. Push spring; 312. Rotary drum. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] like Figures 1-4 As shown, this embodiment provides a double beam CNC gantry milling machine, including: a support 1, a placement plate 101 fixedly installed on the upper surface of the support 1, an insertion port 102 opened on the upper surface of the placement plate 101, the insertion port 102 can be inserted into the loading and unloading mechanism 2 and can lift the plate placed on the upper surface of the placement plate 101, and the loading and unloading mechanism 2 is fixedly installed at both ends of the support 1;

[0041] Among them, the upper surface of the placement plate 101 is provided with a U-shaped sliding groove 103 at both ends, and a clamping mechanism 3 is slidably installed at both ends of the U-shaped sliding groove 103. When the clamping mechanism 3 is pulled back, it can touch one end of the inclined sliding surface 114, so that it is pushed over and rotated by the inclined sliding surface 114 and stored in it. The inclined sliding surface 114 is opened at the lower end of the U-shaped sliding groove 103.

[0042] The placement plate 101 has a first linear module 104 fixedly installed at both ends. A U-shaped frame 105 is fixedly installed between the moving blocks of the two sets of first linear modules 104. The U-shaped frame 105 is suspended above the upper surface of the placement plate 101. A second linear module 108 is fixedly installed inside the U-shaped frame 105. A third linear module 106 is fixedly installed at one end of the moving block of the second linear module 108. A servo motor 107 is fixedly installed at one end of the moving block of the third linear module 106.

[0043] The outer surfaces of the threaded columns of the first linear module 104 and the second linear module 108 are fitted with folded rubber sleeves 109, and the two ends of the folded rubber sleeves 109 are respectively fixedly connected to the two ends of the moving blocks of the first linear module 104 and the second linear module 108.

[0044] Both ends of the placement plate 101 are fixedly installed with first guide rail blocks 110, and first guide blocks 112 are slidably installed on the outer surface of the first guide rail blocks 110. The first guide blocks 112 are fixedly installed on both ends of the inner side of the U-shaped frame 105.

[0045] Among them, a second guide block 111 is fixedly installed at one end of the U-shaped frame 105, a second guide block 113 is slidably installed on the outer surface of the second guide block 111, and the second guide block 113 is fixedly installed at one end of the third linear module 106.

[0046] Through the design of the placement plate 101, insertion port 102, U-shaped slide 103, loading and unloading mechanism 2, and clamping mechanism 3, in use, the plate can be placed on the surface of the loading and unloading mechanism 2, allowing the loading and unloading mechanism 2 to lift the plate to the upper end of the placement plate 101. The other end of the loading and unloading mechanism 2 will rise and insert into the insertion port 102. Subsequently, the loading and unloading mechanism 2 can push the plate to the upper surface of the placement plate 101, and the pushed plate will preferentially fall onto the upper surface of the loading and unloading mechanism 2 within the insertion port 102. This allows the loading and unloading mechanism 2 located within the insertion port 102 to... The board is pushed a second time, allowing the other end of the board to be pushed and dragged onto the upper surface of the loading and unloading mechanism 2 in another set of insertion ports 102. This allows the two loading and unloading mechanisms 2 to push the board to the center of the placement plate 101 and suspend it above the placement plate 101. Then, the clamping mechanism 3 can be activated to slide towards the center in the U-shaped groove 103 opened on the upper surface of the placement plate 101, thereby clamping the two ends of the suspended board. Then, the loading and unloading mechanism 2 can be lowered and reset, allowing the board to be clamped and suspended by the clamping mechanism 3. Then, the first straight line can be... Module 104, the second linear module 108, and the third linear module 106 drive the movement trajectory of the milling cutter according to the processing path to process the sheet metal. Since the sheet metal is suspended, the cutter will not collide with the placement plate 101 during processing, reducing collisions and friction between the cutter and the placement plate 101, lowering the risk of cutter wear and damage, extending the cutter's service life, and avoiding processing accidents that may occur due to cutter collisions with the placement plate 101. If only surface processing or edge cutting of the sheet metal is required, the sheet metal can be supported on the surface of the placement plate 101. The plate is held in place by the clamping mechanism 3, allowing the plate to be either suspended or placed directly on the placement plate 101 for processing, depending on the processing requirements. For processing operations such as perforation or hollowing that may cause the cutting tool to come into contact with the placement plate 101, the plate is suspended by the loading and unloading mechanism 2, which effectively avoids collision between the cutting tool and the placement plate 101 and ensures smooth processing. For cases involving only surface processing or edge cutting, the plate is directly supported on the placement plate 101 and held by the clamping mechanism 3, which is simple and convenient to operate and improves processing efficiency.

[0047] During the process of driving the milling cutter, the first linear module 104 and the second linear module 108 will squeeze or stretch the folded rubber sleeve 109 through the moving block. The folded rubber sleeve 109 is fitted on the outer surface of the threaded rod of the first linear module 104 and the second linear module 108, which can prevent the milling cutter from clogging the threaded rod with debris when processing the plate. This can ensure the stability of the module transmission and ensure that the equipment can operate continuously and smoothly.

[0048] like Figures 5-6As shown, the clamping mechanism 3 includes two sets of geared motors 301. The two sets of geared motors 301 are fixedly installed at both ends of the U-shaped slide groove 103. One end of the output shaft of each set of geared motors 301 is fixedly installed with a forward screw 302 and a reverse screw 303. The other end of the reverse screw 303 is rotatably installed in the inclined sliding surface 114 opened in the U-shaped slide groove 103. The outer surfaces of the forward screw 302 and the reverse screw 303 are threaded with a storage cylinder 306. The two sets of horizontally opposite storage cylinders 306 slide at both ends of the U-shaped slide groove 103. A triangular plate 307 is slidably installed in the storage cylinder 306. The triangular plate 307 can be driven by the forward screw 302 or the reverse screw 303 through the storage cylinder 306 to contact the inclined sliding surface 114, thereby causing the triangular plate 307 to be pushed and retracted into the storage cylinder 306 by the inclined sliding surface 114 through the power transmitted by the threaded rod.

[0049] The storage tube 306 has a push spring 311 fixedly connected to its upper inner surface, and the upper surface of the push spring 311 is fixedly connected to the lower surface of the triangular plate 307.

[0050] One end of each pair of horizontally opposite storage cylinders 306 is fixedly connected to a first protective cylinder 304 and a second protective cylinder 305. The first protective cylinder 304 is slidably sleeved on the outer surface of the second protective cylinder 305, and the first protective cylinder 304 and the second protective cylinder 305 are simultaneously fitted onto the outer surfaces of the forward screw 302 and the reverse screw 303.

[0051] Each of the four sets of triangular plates 307 has an opening 309 at one end. A rotating cylinder 312 is rotatably installed inside each of the four sets of openings 309. A set of clamping rods 308 is fixedly installed between two sets of vertically opposite rotating cylinders 312, so that the two sets of horizontally opposite clamping rods 308 can be driven by two sets of forward screws 302 and reverse screws 303 to slide synchronously towards the middle or outward.

[0052] A torsion spring 310 is fixedly connected to one end of the ring 309, and the other end of the torsion spring 310 is fixedly connected to one end of the ring 309. This allows the torsion spring 310 to apply a torsional force to the rotating cylinder 312 and the clamping rod 308, so that the clamping rod 308 can be driven to flip and abut against the straight end of the triangular plate 307, and can also be driven to touch the inclined sliding surface 114 and flip 90° to be stored in the inlet-shaped sliding groove 103.

[0053] Through the design of the geared motor 301, forward screw 302, reverse screw 303, storage cylinder 306, rotating drum 312, and clamping rod 308, when clamping the sheet metal, the two sets of geared motors 301 can be activated simultaneously to drive the forward screw 302 and the reverse screw 303 to drive the storage cylinder 306, which is threaded on its outer surface, to slide out from the inclined sliding surface 114 into the U-shaped sliding groove 103. The storage cylinder 306 sliding into the U-shaped sliding groove 103 allows the triangular plate 307 to be ejected from the storage cylinder 306 by the spring force applied by the push spring 311. Simultaneously, the annular opening 309 of the triangular plate 307... The inner rotating drum 312 is also rotated by the torsion spring 310, which drives the outer fixed clamping rod 308 to rotate and unfold by 90°. The pop-out and rotated triangular plate 307 and clamping rod 308 can protrude from the U-shaped slide groove 103. With the continuous transmission of the reduction motor 301, the horizontally opposite triangular plate 307 and clamping rod 308 can be driven to slide towards the center synchronously until they press against the two ends of the plate and stop. By sliding towards the center synchronously, the plate can be pushed to the center position of the placement plate 101, thereby achieving the initial positioning of the plate processing.

[0054] After processing, the geared motor 301 can be reversed to drive the storage cylinder 306 to slide from the U-shaped groove 103 into the inclined sliding surface 114, so that the triangular plate 307 and the clamping rod 308 come into contact with the inclined sliding surface 114. This allows the clamping rod 308 to be rotated 90° and stored in the U-shaped groove 103 by the contact with the inclined sliding surface 114. At the same time, it will also drive the rotating cylinder 312 to rotate the internally fixed torsion spring 310, so that the torsion spring 310 can apply a restoring force to the clamping rod 308 to rotate and unfold. As the triangular plate 307 is continuously pulled, The contact between the inclined sliding surface 114 and the triangle plate 307 compresses the push spring 311 and slides into the storage cylinder 306 for storage. The triangle plate 307 and the clamping rod 308 are stored in the inlet-shaped slide groove 103 and the storage cylinder 306, which can prevent these components from interfering with other equipment components or processing tools when they are not in operation. This reduces the risk of equipment damage caused by collision and friction, extends the service life of the equipment, and allows the clamping mechanism 3 to be compactly stored when not in use, without taking up too much space, making the working area of ​​the machine tool more neat and orderly.

[0055] like Figures 7-8As shown, the loading and unloading mechanism 2 includes four sets of support rods 201. Each pair of support rods 201 is fixedly installed at both ends of the bracket 1. A connecting plate 209 is slidably installed inside each set of support rods 201. Both ends of the connecting plate 209 slide out from inside the support rod 201, and an L-shaped frame 202 is fixedly installed at each end. Multiple sets of rubber wheels 205 are rotatably installed inside the L-shaped frame 202. Multiple sets of limiting wheels 207 are rotatably installed on the outer surface of the connecting plate 209 that slides inside the support rod 201. The multiple sets of limiting wheels 207 respectively abut against the two ends of the inner side of the support rod 201.

[0056] A hydraulic rod 208 is fixedly installed inside the support rod 201. The upper surface of the piston rod of the hydraulic rod 208 is fixedly installed on the lower surface of the connecting plate 209, so that the connecting plate 209 can drive the L-shaped frame 202 to be inserted into the insertion port 102 through the hydraulic rod 208, and at the same time, the rubber wheel 205 rotating in the L-shaped frame 202 can protrude from the surface of the placement plate 101.

[0057] A dual-axis motor 203 is fixedly mounted on the upper surface of one set of L-shaped frames 202. A transmission disc is fixedly mounted on the outer surface of the output shafts at both ends of the dual-axis motor 203. A first transmission belt 204 is fitted on the outer surface of both sets of transmission discs. The other end of the two sets of first transmission belts 204 is fitted inside the two sets of L-shaped frames 202 and rotates on one end of the transmission disc where rubber wheels 205 are mounted. Multiple sets of second transmission belts 206 are also fitted between the multiple sets of rubber wheels 205 through the transmission discs, so that they can be driven synchronously in the same direction.

[0058] Through the design of support rod 201, hydraulic rod 208, connecting plate 209, L-shaped frame 202, rubber wheel 205, dual-axis motor 203, and limiting wheel 207, when the plate is lifted onto the surface of the placement plate 101, it can be placed on the upper surface of the lower L-shaped frame 202 and rubber wheel 205. The hydraulic rod 208 is activated to push the connecting plate 209 vertically upwards within the support rod 201 via the limiting wheel 207. The support rod 201 can drive the L-shaped frames 202 at both ends to be aligned with the placement plate 101 and inserted into the insertion port 102. Subsequently, the dual-axis motor 203 can be activated to drive one set of rubber wheels 205 to rotate via the first transmission belt 204. The rubber wheels 205 rotate within the L-shaped frame 202, and the upper... The surface is transferred to the surface of the L-shaped frame 202, and the rubber wheel 205 that is driven to rotate can drive multiple sets of rubber wheels 205 together in the same direction through the second transmission belt 206. This allows the plate placed on the transmission surface of the rubber wheel 205 to be transported to the surface of the placement plate 101. The plate transported to the surface of the placement plate 101 will be supported again on the surface of the rubber wheel 205 of the L-shaped frame 202 in the insertion port 102. This allows the rubber wheel 205 in the insertion port 102 to transport the plate to the center of the placement plate 101 for the second time. At the same time, the other end of the plate will be pushed to the surface of the rubber wheel 205 in the other insertion port 102 and lifted up. This achieves the purpose of lifting and loading the plate.

[0059] After the sheet material is processed, the rubber wheel 205 can be used to slide the sheet material to one side onto the surface of the L-shaped frame 202 at the outer end of the placement plate 101. Then, the hydraulic rod 208 can be activated again to pull the L-shaped frame 202 at both ends of the connecting plate 209 to lower it, thus realizing the unloading of the sheet material. The loading and unloading process greatly reduces manual intervention, reduces the labor intensity of operators, and improves work efficiency.

[0060] In this embodiment, a PLC controller is also provided to control the automated operation of the double-beam CNC gantry milling machine. The PLC controller uses a dynamic clamping force equation to control the clamping mechanism 3 for adaptive clamping force control. The dynamic clamping force equation is as follows:

[0061]

[0062] in:

[0063] E is the elastic modulus of the clamped plate, which is pre-input through the material database;

[0064] d represents the thickness of the sheet material as measured in real time by a laser thickness gauge;

[0065] ε is the set strain threshold, with a value ranging from 0.001 to 0.003;

[0066] ν is the Poisson's ratio of the board material;

[0067] η(t) is a safety factor that is dynamically adjusted based on the standard deviation of pressure distribution σ_std, satisfying η(t)=2.0+0.5·tanh(σstd / 5);

[0068] K p The piezoelectric feedback gain coefficient has a value ranging from 0.1 to 0.5 s / Pa.

[0069] σ(t) represents the real-time pressure data from the 64-point array piezoelectric sensor arranged on the contact surface of the clamping rod 308.

[0070] By deeply integrating mathematical equations with physical structures and defining the nonlinear variation law of η(t), traditional screw drive mechanisms are endowed with intelligent damping characteristics.

[0071] Among them, the piezoelectric sensor array installed on the contact surface of the triangular plate 307 is distributed in an 8×8 matrix on the clamping surface of the clamping rod 308, and is connected to the PLC controller signal. The spacing between each sensing unit is 15mm, and the sampling frequency is ≥200Hz.

[0072] The PLC controller performs the following operations:

[0073] a) Obtain the thickness distribution d(x,y) of the plate using a laser displacement sensor;

[0074] b) Calculate the current pressure gradient tensor

[0075] c) Generate the target clamping force F(t) based on the dynamic clamping force equation;

[0076] d) Control the torque output of the geared motor (301) so that the actual clamping force error is ≤ ±3%.

[0077] By fusing a 64-point sensor array with laser thickness measurement data, a thickness-pressure coupled control model is constructed, overcoming the limitations of single-point feedback.

[0078] When the rate of change of stress is detected When this occurs, the following protective actions will be performed:

[0079] Increase the safety factor η to its maximum value of 3.0;

[0080] Control the reverse screw 303 to retract at a speed of 0.2 mm / s until...

[0081] Generate a pressure distribution heat map and overlay it onto the HMI interface of the CNC system.

[0082] Establish a dynamic security intervention mechanism to transform theoretical equations into executable security protocols, thereby achieving closed-loop protection from algorithm to hardware.

[0083] Workflow:

[0084] 1. Pre-input stage:

[0085] Input the basic parameters of the sheet material (E, ν, nominal thickness d0) on the operation panel;

[0086] The real-time thickness distribution d(x,y) is obtained by scanning with a laser thickness gauge;

[0087] 2. Dynamic adjustment stage:

[0088] Acquire pressure data for a 64-point array;

[0089] Thickness dynamic compensation calculation;

[0090] Calculation based on pressure distribution uniformity;

[0091] Pressure gradient calculation;

[0092] Synchronously adjust the torque of the bidirectional screw;

[0093] 3. Exception handling mechanism:

[0094] When detected Automatically triggers at that time:

[0095] a. Increase the η value to 3.0 to implement overload protection.

[0096] b. Relieve stress by slightly retracting the screw by 0.2mm in the opposite direction.

[0097] c. Generate pressure distribution heatmaps for process optimization.

[0098] This equation successfully solves the technical problems of uneven clamping force distribution, thin plate chatter, and material surface damage that exist in traditional gantry milling machines when machining irregular parts. Simulation verification shows that it can improve the machining accuracy by 1 IT level, and is particularly suitable for the precision machining of large composite material components in the aerospace field.

[0099] The stiffness coefficient k of the torsion spring 310 satisfies:

[0100]

[0101] in:

[0102] L is the effective length of the clamping rod 308;

[0103] δ is the maximum allowable elastic deformation, which is taken as L / 1500;

[0104] F(t) is the calculated value of the current dynamic clamping force.

[0105] By designing the correlation between mechanical parameters and calculated force, the elastic element becomes the active adjustment component of the force control system.

[0106] The hyperbolic tangent function tanh is introduced into the equation to impose a nonlinear constraint on the safety factor, avoiding the oscillation problem of traditional linear adjustment; the pressure gradient tensor is used as a control variable to give the mechanical clamping device the ability to sense the propagation of internal stress in the material; through the correlation design of δ and F(t), the stiffness of the elastic element becomes the adaptive adjustment parameter of the dynamic clamping system.

[0107] For example, when processing 6061 aluminum alloy sheets:

[0108] E=69GPa, d=0.012m, ε=0.0012, ν=0.33;

[0109] Initial settings: η(0) = 2.5, K p =0.3;

[0110] When the sensor detects a sudden increase in local pressure σ(t) = 50 MPa and the rate of change... hour:

[0111] By adjusting the clamping force in real time through piezoelectric sensors, the vibration suppression efficiency is significantly improved compared to a fixed clamping force solution. The safe clamping range is automatically calculated based on the elastic modulus and Poisson's ratio, and the indentation depth on the plate surface is significantly reduced. When a sudden pressure change is detected, the second term of the equation generates a damping effect, which can reduce stress fluctuations to a safe threshold in a very short time.

[0112] Based on the above technical solution, the working steps of this solution are summarized as follows: In use, the plate can be lifted onto the surface of the placement plate 101. The plate can then be placed on the upper surface of the lower L-shaped frame 202 and the rubber wheels 205. The hydraulic rod 208 is activated to push the connecting plate 209 vertically upwards within the support rod 201 via the limiting wheel 207. The support rod 201 can drive the L-shaped frames 202 at both ends to be aligned with the placement plate 101 and inserted into the insertion port 102. Subsequently, the dual-axis motor 203 can be activated to drive one set of rubber wheels 205 to rotate via the first transmission belt 204. The rubber wheels 205 rotate within the L-shaped frame 202, with their upper surfaces passing through the surface of the L-shaped frame 202. The rotated rubber wheels 205... 5. Multiple sets of rubber wheels 205 can be driven simultaneously in the same direction via the second transmission belt 206, thereby enabling the sheet material placed on the transmission surface of the rubber wheels 205 to be conveyed onto the surface of the placement plate 101. The sheet material conveyed to the surface of the placement plate 101 will then be supported again on the surface of the rubber wheels 205 of the L-shaped frame 202 in the insertion port 102, allowing the rubber wheels 205 in the insertion port 102 to convey the sheet material to the center of the placement plate 101 for a second time. At the same time, the other end of the sheet material will be pushed onto the surface of the rubber wheels 205 in the other insertion port 102 and lifted into the air. Subsequently, the two sets of reduction motors 301 can be started to synchronously drive the forward screw 302 and the reverse screw 303 to drive the storage of the threaded installation on the outer surface. The cylinder 306 slides out from the inclined sliding surface 114 into the U-shaped groove 103. The cylinder 306, sliding into the U-shaped groove 103, allows the triangular plate 307 to pop out from within the cylinder 306 by the spring force applied by the push spring 311. Simultaneously, the rotating cylinder 312, rotatably mounted within the annular opening 309 of the triangular plate 307, is also twisted by the torsion spring 310, causing the clamping rod 308, fixedly mounted on its outer surface, to rotate and unfold by 90°. The popped-out and unfolded triangular plate 307 and clamping rod 308 then protrude from the U-shaped groove 103. With the continuous transmission of the reduction motor 301, the laterally opposite triangular plate 307 and clamping rod 308 are driven to slide synchronously towards the center until they press against both ends of the plate, at which point the movement stops. Subsequently, the L-shaped frame 202 can be vertically pulled down by the hydraulic rod 208 to detach from supporting the plate. The plate, now suspended and clamped, can be processed by the first linear module 104, the second linear module 108, and the third linear module 106, which control the movement trajectory of the milling cutter according to the processing path. If only surface processing or edge cutting is required, the plate can be supported on the surface of the placement plate 101 and clamped by the clamping rod 308. Depending on the processing requirements, the plate can be either suspended or placed directly on the placement plate 101 for processing. After processing, the reduction motor 301 and the hydraulic rod 208 can be restarted, and the hydraulic rod 208 can push the L-shaped frame 202 to support the lower surface of the plate again.The geared motor 301 can reverse to drive the storage cylinder 306 to slide from the U-shaped groove 103 into the inclined sliding surface 114, thereby allowing the clamping rod 308 to disengage from the plate. Then, the rubber wheel 205 can transport the plate to one side and slide it onto the surface of the L-shaped frame 202 at the outer end of the placement plate 101. Finally, the hydraulic rod 208 can be activated again to pull the L-shaped frames 202 at both ends of the connecting plate 209 downwards, thus unloading the plate.

[0113] In summary, this double-beam CNC gantry milling machine can hold the sheet metal in an elevated position, preventing the cutting tool from colliding with the placement plate 101 during processing. This reduces collisions and friction between the cutting tool and the placement plate 101, lowers the risk of tool wear and damage, and extends the tool's service life. It also avoids processing accidents that may occur due to the cutting tool colliding with the placement plate 101. If only surface processing or edge cutting of the sheet metal is required, the sheet metal can be supported on the surface of the placement plate 101 and clamped within it. Therefore, depending on different processing requirements, the sheet metal can be either suspended in the air or placed directly on the placement plate 101 for processing, ensuring smooth processing.

[0114] All parts not described in this invention are the same as or can be implemented using existing technology. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double-beam CNC gantry boring and milling machine, characterized in that, include: A bracket (1) is provided, on the upper surface of which a placement plate (101) is fixedly mounted. An insertion port (102) is provided on the upper surface of the placement plate (101). The insertion port (102) allows a loading / unloading mechanism (2) to be inserted into it and to lift the plate placed on the upper surface of the placement plate (101). The loading / unloading mechanism (2) is fixedly mounted at both ends of the bracket (1). The upper surface of the placement plate (101) is provided with a U-shaped sliding groove (103) at both ends. A clamping mechanism (3) is slidably installed at both ends of the U-shaped sliding groove (103). When the clamping mechanism (3) is pulled back, it can touch one end of the inclined sliding surface (114), so that it is pushed over and rotated by the inclined sliding surface (114) for storage. The inclined sliding surface (114) is located at the lower end of the U-shaped sliding groove (103). The placement plate (101) is fixedly installed with a first linear module (104) at both ends. A U-shaped frame (105) is fixedly installed between the moving blocks of the two sets of first linear modules (104). The U-shaped frame (105) is suspended above the upper surface of the placement plate (101). A second linear module (108) is fixedly installed inside the U-shaped frame (105). A third linear module (106) is fixedly installed at one end of the moving block of the second linear module (108). A servo motor (107) is fixedly installed at one end of the moving block of the third linear module (106). The clamping mechanism (3) includes two sets of geared motors (301). The two sets of geared motors (301) are fixedly installed at both ends of the U-shaped slide groove (103). One end of the output shaft of each set of geared motors (301) is fixedly installed with a forward screw (302) and a reverse screw (303). The other end of the reverse screw (303) is rotatably installed in the inclined sliding surface (114) opened in the U-shaped slide groove (103). The outer surfaces of the forward screw (302) and the reverse screw (303) are threaded with a storage cylinder (306). The two sets of laterally opposite storage cylinders (306) slide on the surface of the groove. At both ends of the U-shaped groove (103), a triangular plate (307) is slidably installed inside the storage cylinder (306). The triangular plate (307) can be driven by the forward screw (302) or the reverse screw (303) through the storage cylinder (306) to contact the inclined sliding surface (114), thereby causing the triangular plate (307) to be pushed and slid into the storage cylinder (306) by the inclined sliding surface (114) through the transmission force of the threaded rod. A push spring (311) is fixedly connected to the upper surface of the storage cylinder (306), and the upper surface of the push spring (311) is fixedly connected to the lower surface of the triangular plate (307).

2. The double-beam CNC gantry boring and milling machine according to claim 1, characterized in that: The outer surface of the threaded column of the first linear module (104) and the second linear module (108) is fitted with a folded rubber sleeve (109), and the two ends of the folded rubber sleeve (109) are respectively fixedly connected to the two ends of the moving block of the first linear module (104) and the second linear module (108).

3. The double-beam CNC gantry boring and milling machine according to claim 1, characterized in that: Both ends of the placement plate (101) are fixedly installed with first guide rail blocks (110), and first guide blocks (112) are slidably installed on the outer surface of the first guide rail blocks (110). The first guide blocks (112) are fixedly installed on both ends of the inner side of the U-shaped frame (105). The second guide block (111) is fixedly installed at one end of the U-shaped frame (105), and a second guide block (113) is slidably installed on the outer surface of the second guide block (111). The second guide block (113) is fixedly installed at one end of the third linear module (106).

4. A double-beam CNC gantry boring and milling machine according to claim 1, characterized in that: One end of each pair of horizontally opposite storage tubes (306) is fixedly connected to a first protective tube (304) and a second protective tube (305). The first protective tube (304) slides on the outer surface of the second protective tube (305), and the first protective tube (304) and the second protective tube (305) are simultaneously fitted on the outer surfaces of the forward screw (302) and the reverse screw (303).

5. A double-beam CNC gantry boring and milling machine according to claim 1, characterized in that: Each of the four sets of triangular plates (307) has an opening (309) at one end. A rotating cylinder (312) is rotatably installed in each of the four sets of openings (309). A set of clamping rods (308) is fixedly installed between the two sets of vertically opposite rotating cylinders (312), so that the two sets of horizontally opposite clamping rods (308) can be driven by the two sets of forward screws (302) and reverse screws (303) to slide synchronously towards the middle or outward.

6. A double-beam CNC gantry boring and milling machine according to claim 5, characterized in that: A torsion spring (310) is fixedly connected to one end of the ring (309), and the other end of the torsion spring (310) is fixedly connected to one end of the ring (309). This allows the torsion spring (310) to apply a torsional force to the rotating cylinder (312) and the clamping rod (308), so that the clamping rod (308) can be driven to flip and press against the straight end of the triangular plate (307), and can also be driven to press against the end of the inclined sliding surface (114) and flip 90° to be stored in the inlet-shaped sliding groove (103).

7. A double-beam CNC gantry boring and milling machine according to claim 1, characterized in that: The loading and unloading mechanism (2) includes four sets of support rods (201). Each pair of support rods (201) is fixedly installed at both ends of the bracket (1). A connecting plate (209) is slidably installed inside each set of support rods (201). Both ends of the connecting plate (209) slide out from inside the support rod (201) and are fixedly installed with L-shaped frames (202) at their ends. Multiple sets of rubber wheels (205) are rotatably installed inside the L-shaped frames (202). Multiple sets of limiting wheels (207) are rotatably installed on the outer surface of the connecting plate (209) that slides on the inner segment of the support rod (201). The multiple sets of limiting wheels (207) respectively abut against the inner ends of the support rod (201).

8. A double-beam CNC gantry boring and milling machine according to claim 7, characterized in that: A hydraulic rod (208) is fixedly installed inside the support rod (201). The upper surface of the piston rod of the hydraulic rod (208) is fixedly installed on the lower surface of the connecting plate (209). This allows the connecting plate (209) to drive the L-shaped frame (202) to be inserted into the insertion port (102) via the hydraulic rod (208), and at the same time, the rubber wheel (205) rotating in the L-shaped frame (202) can protrude from the surface of the placement plate (101).

9. A double-beam CNC gantry boring and milling machine according to claim 8, characterized in that: A dual-axis motor (203) is fixedly installed on the upper surface of one of the L-shaped frames (202). A transmission disc is fixedly installed on the outer surface of the output shafts at both ends of the dual-axis motor (203). A first transmission belt (204) is fitted on the outer surface of both sets of transmission discs. The other end of the two sets of first transmission belts (204) is fitted on one end of the transmission disc in the two sets of L-shaped frames (202) where rubber wheels (205) are rotatably installed. Multiple sets of rubber wheels (205) are connected by multiple sets of second transmission belts (206) fitted on the transmission discs, so that they can be synchronously and in the same direction.

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