A middle avoidance servo deflection compensation pressing die structure

Abstract

The invention discloses an intermediate avoidance servo deflection compensation clamping mold structure, comprising: a dovetail mold base, which is fixed on the lower connecting surface of a clamping beam and has a dovetail surface arranged at the lower part; an intermediate avoidance telescopic mold comprising an intermediate mold body, an intermediate mold foot, a left expansion and contraction mold and a right expansion and contraction mold, and a rotary sheet mold comprising a left sheet mold and a right sheet mold, which are installed on the dovetail surface of the dovetail mold base; a segment mold, which comprises a plurality of segment mold units and an inner segment mold, and an intermediate die foot lifting and lowering drive device, which comprises a fixed seat, which is connected to the top of the clamping beam, and the fixed seat and its accessory parts are placed on the inner side of the clamping beam; a clutch-type pull rod device is located at the inner groove of the dovetail mold base, and a rear sheet mold clamping device is installed on the clamping beam on the side of the rotary sheet mold, and a servo-driven presser foot structure is adopted. In addition to realizing the inner retraction avoidance function, there is also an intermediate presser foot pressurizing function, which optimizes the deflection deformation of the clamping beam and the clamping mold and improves the uniformity of the full-length clamping stress distribution.

Description

Technical Field

[0001] The invention relates to the field of chemical dispersing devices, in particular to an intermediate avoidance servo deflection compensation pressing die structure. Background Art

[0002] In the field of folding machine equipment, traditional clamping mold structures often face two major problems during long-term use: First, the bending phenomenon of the clamping beam due to uneven force affects the uniformity of the bending angle, thereby affecting the processing quality of the product; second, the middle position of the mold is prone to wear due to long-term high clamping force, which further aggravates the uneven distribution of the clamping force and reduces the service life and bending accuracy of the mold.

[0003] In the prior art, although there are some solutions that attempt to solve these problems, such as the design of a mold with fixed clamping force (such as the patent with application number CN201610572488.4), these solutions often cannot dynamically adjust the clamping force according to the actual working conditions, and it is difficult to effectively compensate for the flexural deformation of the mold. In addition, there are some solutions that use a two-point clamping device (such as the patent with application number CN ZL201620669281.4), which to a certain extent alleviate the wear problem in the middle of the mold, but due to the small stress in the middle of the mold during clamping, it still causes a large bending angle over the entire length, which cannot meet the requirements of high-precision bending. Summary of the invention

[0004] The object of the present invention is to provide an intermediate avoidance servo deflection compensation clamping mold structure to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: an intermediate avoidance servo deflection compensation pressing mold structure, comprising:

[0006] A dovetail die seat is fixed to the lower connecting surface of the pressing beam, and a dovetail surface is arranged at the lower part;

[0007] The middle avoidance telescopic mold includes a middle mold body, a middle mold foot, a left expansion and contraction mold and a right expansion and contraction mold. The middle mold body is connected to the bottom of the dovetail mold base through a dovetail structure. The middle mold body can move left and right on the dovetail mold base to adapt to offset and asymmetric workpiece pressing. Grooves are arranged on both sides of the middle mold foot and connected to the internal guide rails of the U-shaped groove of the middle mold body to achieve lifting movement. The left expansion and contraction mold and the right expansion and contraction mold are connected to the dovetail mold base through a dovetail structure, and cylinders and cylinder covers are arranged between the middle mold body respectively. The cylinders push the left expansion and contraction mold and the right expansion and contraction mold to expand outwards under the drive of external compressed air;

[0008] The rotary sheet mold, including a left sheet mold and a right sheet mold, is installed on the dovetail surface of the dovetail mold seat;

[0009] The segment mold includes a plurality of segment mold units and an inner segment mold. Under the drive of the motor and the reducer, the segment mold is driven to move as a whole through a clutch-type pull rod device. The plurality of segment mold units are evenly arranged on the outer side of the inner segment mold, and the inner side of the inner segment mold is fitted with a rotary sheet mold.

[0010] The middle mold foot lifting drive device comprises a fixed seat, which is connected to the top of the clamping beam, and the fixed seat and its accessory parts are placed on the inner side of the clamping beam; the fixed seat is provided with a bearing seat and a linear guide rail; the bearing seat is provided with a bearing, the lower part of which is connected with a lead screw, and the upper part is connected with a reducer with a motor through a coupling; the linear guide rail and the lead screw are connected to the nut seat, and the lead screw pushes the nut seat to move up and down; an upper connecting rod is connected to the lower part of the nut seat; the upper connecting rod is connected to the lower connecting rod through a connecting joint, and the lower connecting rod is connected to the middle mold foot;

[0011] The clutch-type pull rod device is located in the inner groove of the dovetail die seat. The motor and reducer drive the pull rod to move left and right to drive the segment die to move toward the center or outside.

[0012] The rear sheet mold clamping device is installed on the clamping beam on the side of the rotary sheet mold and is used to clamp the rear side part of the rotary sheet mold.

[0013] Furthermore, the clutch-type pull rod device pushes the rack and the pull rod to move left and right through gear transmission under the drive of the motor and the reducer. A groove matching the width of the segment mold unit is provided on the pull rod. A pneumatic piston is provided in the segment mold unit, which is extended under the action of compressed air. The piston rod is stuck in the groove of the clutch-type pull rod device, thereby driving the overall movement of the segment mold.

[0014] Furthermore, when the left and right expandable molds are expanded outwardly under the drive of external compressed air, the left and right expandable molds are pushed outward synchronously with the sheet mold by the cylinder to achieve a fully expanded state of the mold; when the clutch-type pull rod device drives the segment mold to move toward the center, the left and right expandable molds shrink inwardly.

[0015] Furthermore, the compensating pressing mold structure's pressing and avoiding action process includes, under the control of a numerical control system, firstly, the motor of the middle mold foot lifting and driving device drives the screw to rotate, so that the middle mold foot moves upward to a preset position; then, the clutch-type pull rod device drives the segment mold to move toward the middle, pushing the left and right sheet molds and the left and right expansion and contraction molds to move toward the middle synchronously, thereby realizing the mold's avoiding action; when the mold needs to press the sheet material, the clutch-type pull rod device drives the segment mold to move outward, and at the same time, compressed air pushes the cylinder to expand the left and right expansion and contraction molds and the left and right sheet molds outward, and the middle mold foot lifting and driving device moves the middle mold foot downward to the pressing position, thereby increasing the middle pressing force to optimize the pressing stress distribution.

[0016] Furthermore, it also includes a calibration mechanism for automatically adjusting the clamping die. The mechanism measures the displacement data of each section of the die and the rotary sheet die in the clamping state, and combines it with a preset clamping force model to adjust the descent depth of the middle die foot in real time to ensure the best clamping effect on sheets of different thicknesses and materials.

[0017] Furthermore, it also includes an automated control system, which is integrated into the mold structure and is used to accurately control the operation of the motor and the reducer through numerical control according to preset clamping parameters and workpiece shape, so as to adjust the rotation direction and speed of the screw rod, and then accurately control the lifting and lowering of the middle mold foot and the expansion and contraction of the left and right expansion and contraction molds.

[0018] Furthermore, it also includes a sensor system, which includes position sensors and pressure sensors, which are respectively installed at key positions of the dovetail mold base, the middle avoidance telescopic mold and the clamping beam, and are used to monitor the position information and clamping force status of each component of the mold in real time, and feed back the monitoring data to the automatic control system to achieve real-time feedback and adjustment of the mold working status, further improving the intelligence level and processing accuracy of the mold.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The servo-driven presser foot of the present invention can compensate for the wear in the height direction of the mold, thereby improving the reliability of long-term use;

[0021] The present invention adopts a servo-driven presser foot structure, which not only realizes the inward avoidance function, but also has a middle mold foot pressurization function, optimizes the flexural deformation of the pressing beam and the pressing mold, improves the uniformity of the full-length pressing stress distribution, and thus improves the bending accuracy of the folding machine;

[0022] The middle pressing and avoiding driving device and the die foot adopt a two-section connecting rod connection method, and the middle die can move left and right on the dovetail die base, which can adapt to offset and asymmetric workpiece pressing and has good adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an overall schematic diagram of the present invention;

[0024] Figure 2 It is a schematic diagram of the middle avoidance mold structure and the compensation servo lifting structure of the present invention;

[0025] Figure 3 For the present invention Figure 2 Schematic diagram of the AA section;

[0026] Figure 4 For the present invention Figure 2 Schematic diagram of the middle BB section;

[0027] Figure 5 It is a schematic diagram of the middle avoidance telescopic module of the present invention;

[0028] Figure 6 It is a schematic diagram of the mold avoidance opening and closing process of the present invention;

[0029] Figure 7 It is a schematic diagram of the mold avoidance and pressing process of the present invention.

[0030] In the figure: 1. dovetail mold base; 2. middle avoidance telescopic mold; 21. middle mold body; 22. middle mold foot; 23. left expansion and contraction mold; 24. right expansion and contraction mold; 25. cylinder head; 26. cylinder; 27. lower connecting rod; 28. connecting joint; 29. ​​guide rail; 3. rotary sheet mold; 31. left sheet mold; 32. right sheet mold; 4. segment mold; 41. segment mold unit; 42. inner segment mold; 5. clutch type pull rod device; 6. middle mold foot lifting drive device; 61. screw rod; 62. nut seat; 63. linear guide rail; 64. upper connecting rod; 65. bearing seat; 66. reducer; 67. motor; 68. coupling; 69. fixed seat; 7. rear side sheet mold clamping device; 8. clamping beam; 50. sheet material. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0032] See also Figure 1-7 The present invention provides a technical solution: an intermediate avoidance servo deflection compensation clamping mold structure, including a dovetail mold base 1: as the basic supporting part of the entire mold, it is fixed on the connecting surface below the clamping beam, and has a dovetail surface below to provide an installation position for other components.

[0033] Middle avoidance telescopic module 2:

[0034] The middle mold body 21 is provided with a dovetail structure, which is connected to the lower part of the dovetail mold base 1 to connect and support other components.

[0035] The middle mold foot 22 has grooves on both sides connected to the inner guide rails of the U-shaped groove of the middle mold body 21, and can move up and down to provide a clamping force under certain circumstances.

[0036] The left expansion and contraction mold 23 and the right expansion and contraction mold 24 are provided with a dovetail structure on the top and connected to the dovetail mold base 1, and expansion and contraction are achieved under the action of external compressed air and pull rods.

[0037] The cylinder piston 26 and the cylinder cover 25 are located between the middle mold body 21 and the left expansion and contraction mold 23 and the right expansion and contraction mold 24, and push the expansion and contraction mold outwards under the drive of external compressed air.

[0038] Lower connecting rod 27: used to connect the middle mold foot 22 and the middle mold foot lifting drive device.

[0039] Guide rail 29: installed inside the U-shaped groove of the middle mold body 21, and cooperates with the grooves on both sides of the middle mold foot 22 to realize the lifting and lowering guidance of the middle mold foot.

[0040] The rotary sheet mold 3 is composed of a left sheet mold 31 and a right sheet mold 32, which are installed on the dovetail surface of the dovetail mold base 1 and cooperate with the expansion and contraction mold to achieve clamping and bending of the workpiece.

[0041] The segment mold 4 includes a segment mold unit 41 and an inner segment mold 42, which are installed on the dovetail surface of the dovetail mold base 1, and move as a whole under the drive of the clutch-type pull rod device to push the sheet mold and the expansion and contraction mold to move.

[0042] The clutch type pull rod device 5 is located in the inner groove of the dovetail mold base 1. Under the drive of the motor and the reducer, the pull rod drives the segment mold to move as a whole.

[0043] The rear sheet mold clamping device 7 is used to clamp the rear part of the rotary sheet mold 3 to ensure the stability of the sheet mold during operation.

[0044] The middle mold foot lifting drive device 6 mainly includes a motor, a reducer, a screw and other components, which are used to drive the lifting movement of the middle mold foot 22 to compensate for the wear in the height direction of the mold and optimize the flexural deformation of the clamping beam.

[0045] Mold assembly steps

[0046] 1. Install the dovetail mold base 1

[0047] Fix the dovetail mold base 1 on the connection surface below the compression beam to ensure that it is firmly installed and accurately positioned. Use bolts or other suitable fixing methods to ensure that the dovetail mold base will not loosen or move during operation.

[0048] 2. Install the middle avoidance telescopic mold 2

[0049] Install the middle mold body 21: Connect the dovetail structure of the middle mold body 21 to the dovetail surface of the dovetail mold base 1 to ensure a tight connection. A positioning pin or other positioning method can be used to ensure that the installation position of the middle mold body is accurate.

[0050] Install the middle mold foot 22: Connect the grooves on both sides of the middle mold foot 22 to the guide rails 29 inside the U-shaped groove of the middle mold body 21 to ensure that the middle mold foot can be lifted and lowered smoothly on the guide rails. Check whether the lifting and lowering movement of the middle mold foot is flexible. If there is any jamming or unsmoothness, make adjustments in time.

[0051] Install the left expansion and contraction mold 23 and the right expansion and contraction mold 24: Connect the dovetail structure above the left and right expansion and contraction molds 23 and 24 to the dovetail mold base 1 to ensure a firm connection. Check whether the dovetail structure of the expansion and contraction mold and the dovetail mold base are tightly matched. If there is any gap, adjust it in time.

[0052] Install the cylinder piston 26 and the cylinder cover 25: Install the cylinder piston 26 and the cylinder cover 25 between the middle mold body 21 and the left and right expansion and contraction molds to ensure that the cylinder can work normally. Connect the external compressed air pipeline and check whether the cylinder is tight and flexible.

[0053] Install the lower connecting rod 27: Connect one end of the lower connecting rod 27 to the middle mold foot 22, and the other end to the middle mold foot lifting drive device to ensure a firm connection.

[0054] 3. Install the rotary sheet mold 3 and segment mold 4

[0055] Install the rotary sheet mold 3: Install the left sheet mold 31 and the right sheet mold 32 on the dovetail surface of the dovetail mold base 1 to ensure that the installation position is accurate and the connection is firm. Check whether the rotation movement of the sheet mold is flexible. If there is any jamming or unsmoothness, make adjustments in time.

[0056] Install the segment mold 4: Install the segment mold unit 41 and the inner segment mold 42 on the dovetail surface of the dovetail mold base 1, ensuring that the installation position is accurate and the connection is firm. Check whether the segment mold is tightly matched with the sheet mold and the expansion and contraction mold. If there is any gap, adjust it in time.

[0057] 4. Install the clutch pull device 5

[0058] Install the clutch-type pull rod device 5 in the inner groove of the dovetail mold base 1 to ensure that it is firmly installed and accurately positioned; connect the motor and the reducer to check whether the movement of the pull rod is flexible and whether it can drive the overall movement of the segment mold normally.

[0059] 5. Install the rear side mold clamping device 7 and the middle mold foot lifting drive device 6

[0060] Install the rear sheet mold clamping device 7: According to the design requirements, install the rear sheet mold clamping device 7 at the corresponding position to ensure that it can clamp the rear part of the rotary sheet mold 3. Check whether the clamping force of the clamping device is sufficient to ensure the stability of the sheet mold during operation.

[0061] Install the middle mold foot lifting drive device 6: Install the motor, reducer, screw and other components in the corresponding positions, ensure that the middle compensation drive device can work normally, connect the middle mold foot 22 and the middle compensation drive device, and check whether the lifting movement of the middle mold foot is accurately controlled by the middle compensation drive device.

[0062] Mold debugging steps:

[0063] 1. Check the installation of each component

[0064] Check whether the installation of each part of the mold is firm, the connection is tight, and the movement is flexible. In particular, check whether the connection between the dovetail mold base 1 and the clamping beam, the connection between the components of the middle avoidance telescopic mold 2, the connection between the rotary sheet mold 3 and the segment mold 4, the installation of the clutch pull device 5, and the installation of the rear sheet mold clamping device 7 and the middle mold foot lifting drive device 6 meet the requirements.

[0065] 2. Debug the middle avoidance telescopic module 2

[0066] Introduce external compressed air to check whether the cylinder piston 26 can push the expansion and contraction mold normally; observe whether the expansion and contraction of the expansion and contraction mold are flexible and whether the speed meets the requirements. If there is any abnormality, check the sealing of the cylinder, the connection of the compressed air pipeline, and whether the control valve of the cylinder is working normally.

[0067] Operate the clutch-type pulling device 5, check whether the segment mold 4 can drive the left and right sheet molds and the left and right expansion and contraction molds to move toward the center to realize the inward retraction of the expansion and contraction molds, check whether the movement of the pulling rod is smooth, and whether the segment mold is closely matched with the sheet mold and the expansion and contraction mold. If there is any gap or jamming, make adjustments in time.

[0068] 3. Debug the middle mold foot lifting drive device

[0069] Start the motor and check whether the screw can rotate normally to drive the middle mold foot 22 to move up and down. Observe whether the lifting speed of the middle mold foot is uniform and whether the movement is smooth. If there is any abnormality, check the operation of the motor, whether the transmission ratio of the reducer is correct, and whether the screw and nut are well matched.

[0070] Check whether the linear guide 63 and the nut seat are well matched to ensure the smooth lifting and lowering of the middle mold foot 22. Observe whether the linear guide moves smoothly and whether there is any jamming or shaking. If there is any abnormality, check whether the linear guide is firmly installed and well lubricated.

[0071] 4. Debug the CNC system

[0072] Check whether the CNC system can accurately control the movement of the lifting drive, tie rods and cylinders. Set different parameters through the CNC system's operating interface and observe whether the movement of each part of the mold is as expected. If there is any abnormality, check whether the CNC system is programmed correctly and whether the sensor feedback is accurate.

[0073] Test the pressing and avoiding action process to ensure that the various actions of the mold are coordinated and orderly. According to the design requirements, simulate the working process of the folding machine and observe the performance of the mold in the actions of pressing, avoiding, and unfolding. If there are any abnormalities, adjust the parameters of the CNC system in time or check the connection and movement of the various parts of the mold.

[0074] Steps to use the mold

[0075] 1. Adjust the mold to suit the workpiece requirements

[0076] According to the shape and size of the workpiece, adjust the position of the middle avoidance telescopic mold 2 and the rotary sheet mold 3. By operating the cylinder and the clutch pull device, adjust the position of the expansion and contraction mold and the sheet mold to ensure that the mold can adapt to the requirements of the workpiece.

[0077] Check whether the workpiece and the mold fit tightly. If there is a gap or mismatch, make adjustments in time. You can use shims or other adjustment methods to ensure that the position of the workpiece on the mold is accurate.

[0078] 2. Clamp the workpiece

[0079] Place the workpiece on the mold, operate the clutch-type pull rod device 5, and make the segment mold 4 drive the left and right sheet molds and the left and right expansion and contraction molds to move toward the center to clamp the workpiece. Check whether the clamping force is sufficient and whether the workpiece is firmly fixed on the mold; if there is looseness or insufficient clamping force, adjust the position of the pull rod or increase the clamping force in time.

[0080] 3. Operate the mold for bending

[0081] Start the CNC system, control the lifting drive device to push the middle mold foot 22 upward, and then operate the clutch pull device 5 to move the segment mold 4 outward to unfold the left and right expansion and contraction molds; observe whether the movements of the molds are coordinated and orderly, and whether the expansion of the expansion and contraction molds and the lifting of the middle mold foot meet the requirements.

[0082] When the folding machine is working, the clamping drive shaft drives the clamping beam to move downward through the screw rod. The segment mold, sheet mold and left and right expansion and contraction molds except the middle mold foot press the sheet material. The middle mold foot lifting drive device pushes the middle mold foot reference surface downward for a distance, so that the clamping force of the middle mold foot is greater than the clamping mold load. Observe whether the clamping force is evenly distributed and whether the workpiece is deformed or displaced during the bending process. If there is any abnormality, adjust the clamping force in time or check the installation and debugging of the mold.

[0083] After the bending process is completed, operate the CNC system to restore the mold to its initial state and remove the workpiece. Check whether the bending accuracy of the workpiece meets the requirements. If there is an error, adjust the mold parameters in time or perform reprocessing.

[0084] Mold maintenance steps

[0085] 1. Regularly check the wear of each mold component

[0086] Regularly check the wear of the dovetail mold base 1, the middle avoidance telescopic mold 2, the rotary sheet mold 3, the segment mold 4, the clutch-type pull rod device 5, the rear sheet mold clamping device 7 and the middle mold foot lifting drive device 6. In particular, check the wear of the middle mold foot 22, the expansion and contraction mold, the sheet mold, the segment mold and the pull rod.

[0087] Replace severely worn parts in a timely manner according to the wear and tear. Use measuring tools such as calipers and micrometers to measure the size of the parts to determine whether they need to be replaced. At the same time, check whether the replaced parts are consistent with the original parts and whether they are installed correctly.

[0088] 2. Keep the mold clean

[0089] Clean the grease and debris on the mold surface regularly. Use detergent and rag to clean the mold to ensure that the mold surface is clean and tidy. In particular, the surfaces of the dovetail mold base 1, the middle avoidance telescopic mold 2, the rotary sheet mold 3, the segment mold 4 and other parts should be carefully cleaned to prevent grease and debris from affecting the working accuracy of the mold.

[0090] Clean the dust and debris inside the mold. The inside of the U-shaped groove of the middle mold body 21, between the cylinder piston 26 and the cylinder cover 25, and the inside of the clutch-type pull rod device 5 should be cleaned regularly to prevent dust and debris from affecting the normal operation of the moving parts of the mold.

[0091] 3. Lubricate moving parts regularly

[0092] Lubricate the cylinder, motor, reducer and other moving parts regularly. Use appropriate lubricating oil or grease to lubricate the moving parts to reduce wear and extend the service life of the parts. In particular, key moving parts such as the lead screw, linear guide 63, nut seat, etc. should be lubricated regularly to ensure their flexible movement.

[0093] Check the working condition of the lubrication system. Regularly check whether the level of lubricating oil or grease is normal, whether the lubrication pipeline is unobstructed, and whether the pressure of the lubrication system meets the requirements. If there is any abnormality, make adjustments or repairs in time.

[0094] 4. Regularly check the operation of the CNC system

[0095] Regularly check the operation of the CNC system and update the software in time. Check whether the display screen, operation buttons, sensors and other components of the CNC system are working properly. If there are any abnormalities, repair or replace them in time.

[0096] Perform regular maintenance on the CNC system. Clean the cooling fan, filter and other components of the CNC system to prevent dust and debris from affecting the cooling performance of the CNC system. At the same time, check whether the power supply and signal lines of the CNC system are firmly connected to ensure the stable operation of the CNC system.

[0097] 5. Regularly debug the mold

[0098] Regularly debug the mold to ensure that the performance indicators of the mold meet the requirements. Check whether the bending accuracy, clamping force, movement speed and other parameters of the mold are normal. If there are any abnormalities, adjust the parameters of the mold in time or repair it.

[0099] Calibrate the mold regularly. Use calibration tools, such as angle rulers and calipers, to calibrate the bending angle, size and other parameters of the mold to ensure the working accuracy of the mold. At the same time, check whether the installation position of the mold is accurate. If there is any deviation, adjust it in time.

[0100] Through the above specific implementation methods, the normal use of the intermediate avoidance servo deflection compensation clamping mold structure can be ensured, the production efficiency and bending accuracy can be improved, the maintenance cost can be reduced, and strong support can be provided for the production of the enterprise.

Claims

1. An intermediate avoidance servo deflection compensation pressing mold structure, characterized in that: include: A dovetail mold base (1) is fixed to the lower connecting surface of the pressing beam (8), and a dovetail surface is provided at the lower portion; The middle avoidance telescopic mold (2) comprises a middle mold body (21), a middle mold foot (22), a left expansion and contraction mold (23) and a right expansion and contraction mold (24), wherein the middle mold body (21) is connected to the bottom of the dovetail mold base (1) through a dovetail structure, and the middle mold body (21) can move left and right on the dovetail mold base (1) to adapt to offset and asymmetric workpiece pressing, and grooves are arranged on both sides of the middle mold foot (22) to connect with the internal guide rails (29) of the U-shaped groove of the middle mold body (21) to achieve lifting movement, and the left expansion and contraction mold (23) and the right expansion and contraction mold (24) are connected to the dovetail mold base (1) through the dovetail structure, and a cylinder (26) and a cylinder cover (25) are arranged between the middle mold body (21) and the middle mold body (21), respectively, and the cylinder (26) is driven by external compressed air to push the left expansion and contraction mold (23) and the right expansion and contraction mold (24) to expand outward; The rotary sheet mold (3) comprises a left sheet mold (31) and a right sheet mold (32), which are mounted on the dovetail surface of the dovetail mold base (1); The segment mold (4) comprises a plurality of segment mold units (41) and an inner segment mold (42), and is driven by a motor and a reducer to drive the segment mold to move as a whole through a clutch-type pull rod device (5); The middle mold foot lifting drive device (6) comprises a fixed seat (69), the fixed seat (69) is connected to the top of the clamping beam (8), and the fixed seat (69) and its attached parts are placed on the inner side of the clamping beam (8); the fixed seat (69) is provided with a bearing seat (65) and a linear guide rail (63); the bearing seat (65) is internally provided with a bearing, is connected to a screw rod (61) at the bottom, and is connected to a reducer (66) with a motor (67) at the top through a coupling (68); the linear guide rail (63) and the screw rod (61) are connected to a nut seat (62), and the screw rod (61) pushes the nut seat (62) to move up and down; an upper connecting rod (64) is connected to the bottom of the nut seat (62); the upper connecting rod (64) is connected to a lower connecting rod (27) through a connecting joint (28), and the lower connecting rod (27) is connected to the middle mold foot (22); The clutch-type pull rod device (5) is located in the inner groove of the dovetail mold base (1), and drives the pull rod to move left and right through the motor and the reducer, so as to drive the segment mold (4) to move toward the center or the outside; The rear sheet mold clamping device (7) is installed on the clamping beam (8) on the side of the rotary sheet mold (3) and is used to clamp the rear side portion of the rotary sheet mold (3).

2. The intermediate avoidance servo deflection compensation pressing mold structure according to claim 1, characterized in that: The clutch-type pull rod device (5) is driven by a motor and a reducer to push the rack and the pull rod to move left and right through gear transmission. A groove matching the width of the segment mold unit (41) is provided on the pull rod. A pneumatic piston is provided in the segment mold unit (41) and extends out under the action of compressed air. The piston rod is inserted into the groove of the clutch-type pull rod device (5), thereby driving the segment mold (4) to move as a whole.

3. The intermediate avoidance servo deflection compensation pressing mold structure according to claim 2 is characterized in that: When the left expansion and contraction mold (23) and the right expansion and contraction mold (24) are expanded outwards under the drive of external compressed air, the cylinder (26) pushes the left expansion and contraction mold (23) and the right expansion and contraction mold (24) to move outwards synchronously with the sheet mold to achieve a fully expanded state of the mold; when the clutch-type pull rod device (5) drives the segment mold (4) to move toward the center, the left expansion and contraction mold (23) and the right expansion and contraction mold (24) are retracted inwards.

4. The intermediate avoidance servo deflection compensation pressing mold structure according to claim 3 is characterized in that: The compensating pressing die structure's pressing avoidance action process includes, under the control of a numerical control system, firstly, the motor (67) of the middle die foot lifting drive device (6) drives the screw rod (61) to rotate, so that the middle die foot (22) moves upward to a preset position; then, the clutch-type pull rod device (5) drives the segment die (4) to move toward the middle, pushing the left and right sheet dies and the left and right expansion and contraction dies to move toward the middle synchronously, thereby realizing the avoidance action of the die; when the die needs to press the sheet material (50), the clutch-type pull rod device (5) drives the segment die (4) to move outward, and at the same time, compressed air pushes the cylinder (26) to expand the left and right expansion and contraction dies and the left and right sheet dies outward, and the middle die foot lifting drive device (6) moves the middle die foot (22) downward to the pressing position, thereby increasing the middle pressing force to optimize the pressing stress distribution.

5. The intermediate avoidance servo deflection compensation pressing mold structure according to claim 4 is characterized in that: It also includes a calibration mechanism for automatically adjusting the clamping die, which measures the displacement data of each segment die (4) and the rotary sheet die (3) in the clamping state, and adjusts the descending depth of the middle die foot (22) in real time in combination with a preset clamping force model, so as to ensure that the best clamping effect can be achieved on sheets (50) of different thicknesses and materials.

6. The intermediate avoidance servo deflection compensation pressing mold structure according to claim 5, characterized in that: Also included is an automated control system, which is integrated into the mold structure and is used to precisely control the operation of the motor (67) and the reducer (66) through numerical control according to preset clamping parameters and workpiece shape, so as to adjust the rotation direction and speed of the screw rod (61), thereby precisely controlling the lifting and lowering of the middle mold foot (22) and the expansion and contraction of the left and right expansion and contraction molds.

7. The intermediate avoidance servo deflection compensation pressing mold structure according to claim 6, characterized in that: The invention also comprises a sensor system, which comprises a position sensor and a pressure sensor, which are respectively installed at key positions of the dovetail mold base (1), the middle avoidance telescopic mold (2) and the clamping beam (8), and are used to monitor the position information and the clamping force status of each component of the mold in real time, and feed back the monitoring data to the automatic control system, so as to realize real-time feedback and adjustment of the working status of the mold, and further improve the intelligence level and processing accuracy of the mold.

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