High-machining-precision numerical control intelligent bending machine for metal plates

Abstract

The invention discloses a high-machining-precision numerical control intelligent bending machine for metal plates, and relates to the technical field of bending machines, the high-machining-precision numerical control intelligent bending machine for metal plates comprises a bending machine body, and the bending machine body is provided with a controller, a bending punch assembly and a lower die assembly; the bending device further comprises a synchronous monitoring assembly, a rear material blocking assembly and a protection lifting assembly, the bending punch assembly comprises a lifting plate, and a plurality of bending heads are installed at the bottom of the lifting plate. The lower die assembly comprises a lower die table and a feeding platform. The synchronous monitoring assembly comprises a monitoring mechanism, and the monitoring mechanism comprises a synchronous table and a monitoring table; by means of the synchronous table and the monitoring table, the stamping stroke of the bending head can be monitored in real time, the lower die table is lifted in cooperation with the protection lifting assembly, bent metal plates are protected or subjected to stroke compensation in time, the bending precision is improved, and the situation that a large number of unqualified or damaged bent plates are produced under automatic long-time operation is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of bending machines, and in particular to a CNC intelligent bending machine for sheet metal with high processing accuracy. Background Art

[0002] Sheet metal bending machine is a mechanical equipment that bends metal sheets into shape through molds. It is widely used in the automotive, aviation, construction, home appliance and other industries. Its core function is to drive the closing or opening of the upper die (punch) and the lower die (die) through hydraulic or CNC systems according to design requirements, so that the sheet metal undergoes plastic deformation under the action of the mold, thereby forming the required angle and shape.

[0003] According to the needs of processing and automation, sheet metal bending machines include manual bending machines, hydraulic bending machines and CNC bending machines. Among them, CNC bending machines use programmable automatic control to perform high-precision automatic control of the material blocking mechanism and the upper die stamping stroke.

[0004] Existing CNC sheet metal bending machines all have automatic control functions to drive various components for automated production, but they do not have real-time monitoring functions during bending processing. In the actual operation of the bending machine, there are equipment failures and programming errors that cause the stamping and bending stroke to be too long or too short. This will not only cause the bending angle of the sheet to shift and reduce the bending accuracy, but also cause damage to the sheet metal in severe cases. Timely monitoring and processing are required, otherwise serious losses will be caused under long-term automated operation. After the failure is detected, the machine needs to be shut down for maintenance, affecting production efficiency. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a CNC intelligent bending machine for sheet metal with high processing accuracy, which solves the problem.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A CNC intelligent bending machine for sheet metal with high processing accuracy, comprising a bending machine body, the bending machine body is equipped with a controller, a bending punch assembly and a lower die assembly, and also includes a synchronous monitoring assembly, a rear stop assembly and a protective lifting assembly, wherein: The bending punch assembly includes a lifting plate driven by a hydraulic cylinder, and a plurality of bending heads are installed at the bottom of the lifting plate; The lower die assembly includes a lower die table and a loading platform for loading materials; The rear stopper assembly is used to position the sheet metal; The synchronous monitoring assembly includes a monitoring mechanism fixed in the bending machine body by a mounting frame, and the monitoring mechanism includes a synchronous table that rises and falls synchronously with the lifting plate and a monitoring table that can adjust the height and monitor the travel of the synchronous table; The protective lifting assembly cooperates with the monitoring platform to drive the lower mold assembly to rise and fall to protect the bent sheet metal and perform stroke compensation.

[0007] Preferably, the mounting frame is fixed at the rear end of the lifting plate, the monitoring mechanism also includes a fixed cylinder symmetrically arranged and fixed between the mounting plates, the synchronization platform is sleeved on the outside of the fixed cylinder and movably connected to the fixed cylinder, a synchronization frame fixedly connected to the lifting plate is installed on the side of the fixed cylinder close to the lifting plate, the monitoring platform is arranged at the bottom of the synchronization platform, and the bottom of the synchronization platform and the top of the monitoring platform are respectively installed with magnetic plates and electromagnetic induction sensors that cooperate with each other.

[0008] According to the type and size of the sheet metal to be processed, the servo motor is started through the controller, and the servo motor drives the second screw to rotate. The rotation of the second screw drives the monitoring platform to be raised and lowered to a preset position.

[0009] The electromagnetic induction sensor preferably adopts a Hall sensor. Based on the Hall effect, the Hall sensor can monitor the travel of the synchronization platform more sensitively and accurately.

[0010] A servo motor is symmetrically mounted on the upper end of the mounting frame, a power shaft passing through a fixed cylinder is mounted on the output end of the servo motor, a second screw rod which is in contact with the fixed cylinder and has the same radius as the fixed cylinder is mounted on the bottom of the power shaft, and the monitoring platform is sleeved on the outside of the second screw rod and is threadedly connected to the second screw rod.

[0011] According to the type and size of the sheet metal to be processed, the servo motor is started through the controller, and the servo motor drives the second screw to rotate. The rotation of the second screw drives the monitoring platform to rise and fall until the distance between the upper end of the monitoring platform and the lower end of the synchronization platform is slightly longer than the stamping stroke length of the sheet metal to be processed. Preferably, guide frames symmetrically arranged in groups of two are installed between the mounting frames, the synchronization platform and the monitoring platform are both clamped by the guide frames and movably connected to the guide frames, the inner wall at the bottom of the guide frame is symmetrically provided with limit sliders, and a plurality of sliders are symmetrically installed on the outer side of the monitoring platform, and the sliders are slidably connected to the limit sliding grooves.

[0012] The guide frame can keep the synchronization platform and the monitoring platform vertically rising and falling, and the slider and the slide groove can limit the moving track of the monitoring platform.

[0013] Preferably, the protective lifting assembly includes a servo cylinder symmetrically arranged at the bottom of the lower mold platform, an upward-opening installation box is installed at the bottom of the lower mold platform, the servo cylinder is installed in the installation box, and a transmission frame fixedly connected to the bottom of the lower mold platform is installed at the output end of the servo cylinder.

[0014] When the downward stamping stroke of the bending head is extended, the controller controls the servo cylinder to start, and the servo cylinder drives the lower die table and the loading platform to move downward through the transmission frame. At this time, the loading platform and the sheet metal on the upper die table that have completed the bending move downward to avoid the continued stamping of the bending head that exceeds the stroke; When the downward stamping stroke of the bending head is shortened, the controller controls the servo cylinder to start, and the servo cylinder drives the lower die table and the loading platform to move upward through the transmission frame. At this time, the unbent loading platform and the sheet metal on the upper die table move upward to cooperate with the bending head to complete the stamping and bending. Preferably, the loading platform includes a placing table having a connecting frame fixedly connected to the front end of the upper mold platform, the upper end surface of the loading platform is parallel to the upper end surface of the mold on the lower mold platform, and the front end of the installation box is provided with a lifting groove movably connected to the connecting frame.

[0015] The sheet metal to be processed is introduced from the loading platform. After entering the loading platform, the sheet metal passes through the lower die table and rests on the baffle plate for positioning. At this time, the controller starts the hydraulic cylinder according to the corresponding programmed preset data. The hydraulic cylinder drives the lifting plate to move downward, and the lifting plate drives the bending head to move downward to the corresponding stroke to stamp and bend the sheet metal. Preferably, the rear stopper assembly includes mounting plates symmetrically installed in pairs in the bending machine body, a first screw is installed between the mounting plates, a driving motor connected to the first screw is fixed to the side end of the mounting plate, the first screw is externally threadedly connected to a movable platform, and a stopper plate is installed at the upper end of the movable platform.

[0016] Preferably, a positioning column is further installed between the mounting plates, the positioning column is parallel to the first screw rod, and the positioning column passes through the movable platform and is movably connected and matched with the movable platform.

[0017] The driving motor is started by the controller, and the driving motor drives the first screw to rotate, and the rotation of the first screw drives the movable table to move forward and backward, and the movable table drives the baffle plate to move forward and backward to a suitable position adapted to the sheet metal to be processed The present invention has the following beneficial effects: 1. The present invention uses a synchronous platform that is synchronously lifted and lowered with the lifting plate in the synchronous monitoring assembly and a monitoring platform that can monitor the synchronous platform through an electromagnetic induction sensor. It can monitor the stamping stroke of the bending head in real time during the bending operation. In conjunction with the driving cylinder in the protective lifting assembly, when there is a deviation in the stamping stroke of the bending head, the lower die table can be lifted and lowered according to actual conditions. When the stamping stroke is too long and the sheet metal is about to be damaged, the lower die assembly can be lowered to protect the sheet metal, or when the stroke becomes short, the lower die table can be lifted to compensate for the stroke of the sheet metal that has not been bent. This improves the bending accuracy, allows production to continue when the equipment has a fixed stroke, delays the time for maintenance and overhaul, improves production efficiency, and avoids the production of a large number of unqualified or damaged bent sheets under long-term automation operation.

[0018] 2. The present invention drives the second screw to rotate through a servo motor so that the detection platform can be adjusted in height. In actual production, the height of the monitoring platform can be adaptively adjusted according to the type or size of the bent sheet metal. When the type of bent sheet metal is changed, the monitoring platform is adjusted to the corresponding stroke height, so that the device can monitor when different sheet metals are bent.

[0019] 3. The present invention can drive the movable table to move forward and backward through the driving motor and the second screw in the rear stop mechanism, and then drive the stop plate to move forward and backward, so that the stop plate can adjust the front and rear positions according to the types of the bent sheet metal, and the bent sheet metal can be positioned to stop the material and improve the bending accuracy.

[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the installation position of the synchronous monitoring component of the present invention; Figure 4 This is a schematic diagram of the structure of the synchronous monitoring component of the present invention; Figure 5 It is a schematic diagram of the structure of the monitoring mechanism of the present invention; Figure 6 It is a cross-sectional view of the interior of the monitoring mechanism of the present invention; Figure 7 This is a schematic diagram of the structure of the lower mold assembly of the present invention; Figure 8 This is a schematic diagram of the installation position of the protective lifting assembly of the present invention; Fig. 9 This is a schematic diagram of the structure of the feeding platform of the present invention; Fig.10 It is a schematic structural diagram of the rear material guiding assembly of the present invention.

[0022] In the figure, 1, bending machine body; 11, controller; 2, bending punch assembly; 21, hydraulic cylinder; 22, lifting plate; 23, bending head; 3, lower die assembly; 31, lower die table; 32, loading platform; 321, placing table; 322, connecting frame; 33, installation box; 331, lifting slot; 4, rear stopper assembly; 41, driving motor; 42, mounting plate; 43, first screw; 44, positioning column; 45, movable table; 46, Baffle plate; 5. Protective lifting assembly; 51. Servo cylinder; 52. Transmission frame; 6. Synchronous monitoring assembly; 61. Mounting frame; 62. Monitoring mechanism; 63. Servo motor; 631. Power shaft; 632. Second screw; 64. Synchronous table; 641. Synchronous frame; 642. Magnetic plate; 65. Fixed cylinder; 66. Monitoring table; 661. Slider; 662. Electromagnetic induction sensor; 67. Guide frame; 671. Limit slide. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] See also Figure 1-Figure 10 The embodiment of the present invention provides a technical solution: a CNC intelligent bending machine for sheet metal with high processing accuracy, comprising a bending machine body 1, the bending machine body 1 is equipped with a programmable controller 11, a bending punch assembly 2 and a lower die assembly 3, and also includes a synchronous monitoring assembly 6, a rear stop assembly 4 and a protective lifting assembly 5, wherein: The bending punch assembly 2 includes a lifting plate 22 driven by a hydraulic cylinder 21, and a plurality of bending heads 23 are installed at the bottom of the lifting plate 22; The lower die assembly 3 includes a lower die table 31 and a loading platform 32 for loading materials; The rear stopper assembly 4 is used to position the sheet metal; The synchronous monitoring assembly 6 includes a monitoring mechanism 62 fixed in the bending machine body 1 through a mounting frame 61, and the monitoring mechanism 62 includes a synchronous table 64 that is synchronously lifted and lowered with the lifting plate 22 and a monitoring table 66 that can adjust the height and monitor the travel of the synchronous table 64; The protective lifting assembly 5 cooperates with the monitoring platform 66 to drive the lower mold assembly 3 to rise and fall to protect the bent sheet metal and compensate for the stroke.

[0026] Please refer to the attached Figure 2 The mounting frame 61 is fixed at the rear end of the lifting plate 22. The monitoring mechanism 62 also includes a fixed cylinder 65 symmetrically arranged between the mounting plates 42. The synchronization platform 64 is sleeved on the outside of the fixed cylinder 65 and movably connected with the fixed cylinder 65. A synchronization frame 641 fixedly connected to the lifting plate 22 is installed on the side of the fixed cylinder 65 close to the lifting plate 22. The monitoring platform 66 is arranged at the bottom of the synchronization platform 64. The bottom of the synchronization platform 64 and the top of the monitoring platform 66 are respectively installed with a magnetic plate 642 and an electromagnetic induction sensor 662 that cooperate with each other.

[0027] Specifically, according to the type and size of the sheet metal to be processed, the servo motor 63 is started by the controller 11, and the servo motor 63 drives the second screw 632 to rotate, and the rotation of the second screw 632 drives the monitoring platform 66 to be raised and lowered to a preset position.

[0028] Furthermore, the electromagnetic induction sensor 662 preferably adopts a Hall sensor. Based on the Hall effect, the Hall sensor can monitor the travel of the synchronization platform 64 more sensitively and accurately.

[0029] During the bending operation, after the bending head 23 is pressed down and bent through the programmable controller 11, a waiting time of 1 second needs to be set. During the waiting time, the position of the synchronization table 64 is detected by the electromagnetic induction sensor 662 to detect when the stroke of the bending head 23 is shortened.

[0030] Please refer to the attached Figure 4 , Attachment Figure 5 , Attachment Figure 6 A servo motor 63 is symmetrically mounted on the upper end of the mounting frame 61, a power shaft 631 passing through the fixed cylinder 65 is mounted on the output end of the servo motor 63, a second screw 632 which fits the fixed cylinder 65 and has the same radius as the second screw 632 is mounted at the bottom of the power shaft 631, and a monitoring platform 66 is sleeved on the outside of the second screw 632 and is threadedly connected to the second screw 632.

[0031] In summary, there are two triggering situations of the electromagnetic induction sensor 662. The first is that after the bending head 23 is pressed down to complete the bending, the bending head 23 continues to move downward, and the synchronization platform 64 also continues to move downward beyond the stroke threshold and is triggered. The second is that after the bending head 23 is pressed down to complete the bending, the bending head 23 has an insufficient downward stroke, and the monitoring platform 66 still fails to detect that the synchronization platform 64 has reached the preset stroke threshold within the waiting time of 1 second, which triggers it.

[0032] It should be noted that when adjusting the position of the monitoring platform 66 during the actual production process, since the sensor uses a non-contact electromagnetic induction sensor 662, the distance between the top of the monitoring platform 66 and the bottom of the synchronization platform 64 needs to be adjusted to be slightly longer than the stamping stroke of the bending head 23. The preferred length exceeding the stroke of the bending head 23 is 2 cm to avoid the synchronization platform 64 pressing down and damaging the electromagnetic induction sensor 662 when the stroke becomes longer due to an error.

[0033] Furthermore, guide frames 67 are symmetrically arranged in groups of two between the mounting frames 61. The synchronization platform 64 and the monitoring platform 66 are both clamped by the guide frames 67 and movably connected to the guide frames 67. Limiting sliders 661 are symmetrically provided on the inner wall at the bottom of the guide frame 67. Multiple sliders 661 are symmetrically installed on the outer side of the monitoring platform 66. The sliders 661 are slidably connected to the limiting slide grooves 671.

[0034] Specifically, the guide frame 67 can maintain the vertical rise and fall of the synchronization platform 64 and the monitoring platform 66 , and the slider 661 cooperates with the slide groove to limit the movement trajectory of the monitoring platform 66 .

[0035] Please refer to the attached Figure 7 , Attachment Figure 8 The protective lifting assembly 5 includes a servo cylinder 51 symmetrically arranged at the bottom of the lower mold platform 31. An installation box 33 with an upward opening is installed at the bottom of the lower mold platform 31. The servo cylinder 51 is installed in the installation box 33. A transmission frame 52 fixedly connected to the bottom of the lower mold platform 31 is installed at the output end of the servo cylinder 51.

[0036] When the downward punching stroke of the bending head 23 is extended, the controller 11 controls the servo cylinder 51 to start, and the servo cylinder 51 drives the lower die table 31 and the loading platform 32 to move downward through the transmission frame 52. At this time, the loading platform 32 and the sheet metal on the upper die table that have completed bending move downward to avoid the continued punching of the bending head 23 that exceeds the stroke; When the downward stamping stroke of the bending head 23 is shortened, the controller 11 controls the servo cylinder 51 to start, and the servo cylinder 51 drives the lower die table 31 and the loading platform 32 to move upward through the transmission frame 52. At this time, the unbent loading platform 32 and the sheet metal on the upper die table move upward to cooperate with the bending head 23 to complete the stamping and bending. Furthermore, the loading platform 32 includes a placing table 321 having a connecting frame 322 fixedly connected to the front end of the upper mold platform. The upper end surface of the loading platform 32 is parallel to the upper end surface of the mold on the lower mold platform 31. The front end of the installation box 33 is provided with a lifting slot 331 movably connected to the connecting frame 322.

[0037] Please refer to the attached Fig.10The rear stopper assembly 4 includes mounting plates 42 symmetrically installed in pairs in the bending machine body 1, a first screw 43 is installed between the mounting plates 42, a driving motor 41 connected to the first screw 43 is fixed to the side end of the mounting plate 42, the first screw 43 is externally threadedly connected to a movable platform 45, and a stopper plate 46 is installed on the upper end of the movable platform 45.

[0038] The above-mentioned electrical equipment such as the servo motor 63, the drive motor 41, the servo cylinder 51, the hydraulic cylinder 21, etc. are all automatically controlled by the programmable controller 11 according to the data parameters set by the controller 11. The electromagnetic induction sensor 662 is electrically connected to the controller 11, and the electromagnetic induction sensor 662 and the trigger threshold are adjusted by the controller 11.

[0039] Furthermore, a positioning column 44 is installed between the mounting plates 42 . The positioning column 44 is parallel to the first screw rod 43 . The positioning column 44 passes through the movable platform 45 and is movably connected and matched with the movable platform 45 .

[0040] Specifically, according to the type and size of the sheet metal to be processed, the drive motor 41 is started through the controller 11, the drive motor 41 drives the first screw 43 to rotate, the rotation of the first screw 43 drives the movable table 45 to move back and forth, the movable table 45 drives the baffle plate 46 to move back and forth to a suitable position suitable for the sheet metal to be processed, and the sheet metal is positioned against the baffle plate 46 during the bending process.

[0041] The invention provides a CNC intelligent bending machine for sheet metal with high processing accuracy, and its usage and function: First, before the bending operation is performed, the lifting plate 22 is located at the uppermost end, and the synchronization table 64 connected to the lifting plate 22 through the synchronization frame 641 is located at the uppermost end of the fixed cylinder 65. According to the type and size of the sheet metal to be processed, the servo motor 63 is started through the controller 11, and the servo motor 63 drives the second screw 632 to rotate. The second screw 632 rotates to drive the monitoring table 66 to rise and fall until the distance between the upper end of the monitoring table 66 and the lower end of the synchronization table 64 is slightly longer than the stamping stroke length of the sheet metal to be processed; Second, according to the type and size of the sheet metal to be processed, the controller 11 starts the drive motor 41, the drive motor 41 drives the first screw 43 to rotate, the first screw 43 rotates to drive the movable table 45 to move forward and backward, and the movable table 45 drives the baffle plate 46 to move forward and backward to a suitable position adapted to the sheet metal to be processed; Third, when performing the bending operation, the sheet metal to be processed is introduced from the loading platform 32. After entering the loading platform 32, the sheet metal passes through the lower die table 31 and rests on the baffle plate 46 for positioning. At this time, the controller 11 starts the hydraulic cylinder 21 according to the corresponding programmed preset data. The hydraulic cylinder 21 drives the lifting plate 22 to move downward, and the lifting plate 22 drives the bending head 23 to move downward to the corresponding stroke to stamp and bend the sheet metal. Fourth, during the third step, if an error occurs in the downward pressing stroke of the bending head 23, resulting in an extension of the downward stamping stroke of the bending head 23, when the bending head 23 moves downward driven by the lifting plate 22, the synchronization platform 64 moves downward synchronously with the bending head 23 through the synchronization frame 641. At this time, the synchronization platform 64 gradually approaches the monitoring platform 66. The electromagnetic induction sensor 662 on the monitoring platform 66 monitors the position of the synchronization platform 64 through the magnetic plate 642 on the synchronization platform 64. When the synchronization platform 64 drops to a value exceeding the preset stroke threshold, the electromagnetic induction sensor 662 is triggered. At this time, the controller 11 controls the servo cylinder 51 to start, and the servo cylinder 51 drives the lower die table 31 and the loading platform 32 to move downward through the transmission frame 52. At this time, the loading platform 32 that has completed the bending and the sheet metal on the upper die table move downward to avoid the continued stamping of the bending head 23 that exceeds the stroke. If an error occurs in the downward stroke of the bending head 23, resulting in a shortened downward stamping stroke of the bending head 23, after the 1-second waiting time after the bending is completed, the monitoring platform 66 detects through the electromagnetic induction sensor 662 that the synchronization platform 64 has not reached the preset stroke, and is triggered. At this time, the controller 11 controls the servo cylinder 51 to start, and the servo cylinder 51 drives the lower die table 31 and the loading platform 32 to move upward through the transmission frame 52. At this time, the loading platform 32 that has not completed the bending and the sheet metal on the upper die table move upward accordingly to cooperate with the bending head 23 to complete the stamping and bending.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0043] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A CNC intelligent bending machine for sheet metal with high processing accuracy, comprising a bending machine body (1), wherein the bending machine body (1) is equipped with a controller (11), a bending punch assembly (2) and a lower die assembly (3), characterized in that: It also includes a synchronous monitoring component (6), a rear stop component (4) and a protective lifting component (5), wherein: The bending punch assembly (2) comprises a lifting plate (22) driven by a hydraulic cylinder (21), and a plurality of bending heads (23) are installed at the bottom of the lifting plate (22); The lower die assembly (3) comprises a lower die table (31) and a loading platform (32) for loading materials; The rear stopper assembly (4) is used to position the sheet metal; The synchronous monitoring assembly (6) comprises a monitoring mechanism (62) fixed in the bending machine body (1) via a mounting frame (61), wherein the monitoring mechanism (62) comprises a synchronous platform (64) that rises and falls synchronously with the lifting plate (22) and a monitoring platform (66) that is height-adjustable and capable of monitoring the travel of the synchronous platform (64); The protective lifting component (5) cooperates with the monitoring platform (66) to drive the lower die component (3) to rise and fall to protect the bent sheet metal and perform stroke compensation.

2. According to claim 1, a CNC intelligent bending machine for sheet metal with high processing accuracy, characterized in that: The mounting frame (61) is fixed at the rear end of the lifting plate (22), the monitoring mechanism (62) further comprises a fixed cylinder (65) symmetrically arranged and fixed between the mounting plates (42), the synchronization platform (64) is sleeved on the outside of the fixed cylinder (65) and movably connected to the fixed cylinder (65), and a synchronization frame (641) fixedly connected to the lifting plate (22) is installed on a side of the fixed cylinder (65) close to the lifting plate (22).

3. According to claim 2, a CNC intelligent bending machine for sheet metal with high processing accuracy is characterized in that: The monitoring platform (66) is arranged at the bottom of the synchronization platform (64), and a magnetic plate (642) and an electromagnetic induction sensor (662) that cooperate with each other are respectively installed at the bottom of the synchronization platform (64) and the top of the monitoring platform (66).

4. According to claim 3, a CNC intelligent bending machine for sheet metal with high processing accuracy is characterized in that: A servo motor (63) is symmetrically mounted on the upper end of the mounting frame (61); a power shaft (631) passing through a fixed cylinder (65) is mounted on the output end of the servo motor (63); a second screw rod (632) that fits the fixed cylinder (65) and has the same radius as the second screw rod (632) is mounted on the bottom of the power shaft (631); and the monitoring platform (66) is sleeved on the outside of the second screw rod (632) and is threadedly connected to the second screw rod (632).

5. According to claim 3, a CNC intelligent bending machine for sheet metal with high processing accuracy is characterized in that: Guide frames (67) are also installed between the mounting frames (61) in a symmetrical arrangement of two by two. The synchronization platform (64) and the monitoring platform (66) are both clamped within the guide frames (67) and are movably connected to the guide frames (67).

6. According to claim 5, a CNC intelligent bending machine for sheet metal with high processing accuracy is characterized in that: The inner wall at the bottom of the guide frame (67) is symmetrically provided with a limit slide block (661), and the outer side of the monitoring platform (66) is symmetrically provided with a plurality of slide blocks (661), and the slide blocks (661) are slidably connected to the limit slide groove (671).

7. The CNC intelligent bending machine for sheet metal with high processing accuracy according to claim 1 is characterized in that: The protective lifting assembly (5) comprises a servo cylinder (51) symmetrically arranged at the bottom of the lower die table (31); an upwardly open mounting box (33) is mounted at the bottom of the lower die table (31); the servo cylinder (51) is mounted in the mounting box (33); and a transmission frame (52) fixedly connected to the bottom of the lower die table (31) is mounted at the output end of the servo cylinder (51).

8. The CNC intelligent bending machine for sheet metal with high processing accuracy according to claim 7, characterized in that: The loading platform (32) comprises a placing table (321) having a connecting frame (322) fixedly connected to the front end of the upper die table, the upper end surface of the loading platform (32) is parallel to the upper end surface of the die on the lower die table (31), and the front end of the installation box (33) is provided with a lifting slot (331) movably connected to the connecting frame (322).

9. The CNC intelligent bending machine for sheet metal with high processing accuracy according to claim 1, characterized in that: The rear stopper assembly (4) comprises mounting plates (42) symmetrically mounted in pairs in a group inside the bending machine body (1), a first screw rod (43) being mounted between the mounting plates (42), a driving motor (41) connected to the first screw rod (43) being fixed to the side end of the mounting plate (42), a movable platform (45) being externally threadedly connected to the first screw rod (43), and a stopper plate (46) being mounted on the upper end of the movable platform (45).

10. The CNC intelligent bending machine for sheet metal with high processing accuracy according to claim 9, characterized in that: A positioning column (44) is also installed between the mounting plates (42). The positioning column (44) is parallel to the first screw rod (43). The positioning column (44) passes through the movable platform (45) and is movably connected and matched with the movable platform (45).

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