A segmented bending mechanism of a numerical control bending machine

Abstract

The utility model discloses a segmented bending mechanism of numerical control bending machine, including segmented bending mechanism main part, both sides slide and hold seat, slide limiting mechanism, reset mechanism, connect between the slide and hold seat with workstation fixed portion, including spring and the connector of connecting both ends of spring respectively to the slide and hold seat with the workstation fixed portion, through the cooperation of both sides slide and hold seat and slide support structure, both ends of the plate are not fixed to avoid the problem of large swing, and the synchronous sliding of both ends of the plate with bending deformation is realized, the additional stress caused by rigid constraint is eliminated, and the bending angle deviation can be controlled within 0.3 degrees.

Description

Technical Field

[0001] This utility model relates to the field of bending machine technology, and in particular to a segmented bending mechanism for a CNC bending machine. Background Technology

[0002] In the field of sheet metal processing, the processing of long sheets or multi-segment bent parts by CNC bending machines has always been a challenge. Due to their large length and numerous bending segments, these types of sheets have much higher requirements for clamping stability and deformation adaptability than ordinary short sheets. Traditional mechanisms struggle to balance positioning accuracy and deformation freedom.

[0003] In traditional bending mechanisms, sheet metal is often held in a fixed support manner. When the sheet metal is bent in sections, its ends lack the ability to adapt to deformation and are easily subjected to additional stress due to rigid constraints. This stress can cause the bending angle deviation to exceed ±1° and form wrinkles or even cracks on the sheet metal surface. Especially for high-strength alloy sheets, the defect rate can reach 20%.

[0004] If the ends of the sheet are not fixed and only the middle is clamped, although the rigidity constraint can be reduced, the sheet will swing significantly during bending due to the lack of constraint at both ends. In actual processing, this swing can cause the bending angle deviation to be more than ±3°, and there is a risk of the sheet slipping during high-speed bending, which seriously affects processing safety and product qualification rate. Utility Model Content

[0005] Purpose of the invention: The purpose of this utility model is to provide a segmented bending mechanism for a CNC bending machine. By cooperating with the sliding clamping seats on both sides and the sliding support structure, it not only avoids the problem of large swing of the plate caused by the lack of fixation at both ends, but also realizes the synchronous sliding of the plate at both ends as it deforms during bending, eliminating the additional stress caused by rigid constraints, and can control the bending angle deviation within ±0.3°.

[0006] Technical solution:

[0007] A segmented bending mechanism for a CNC bending machine, comprising:

[0008] The main body of the segmented bending mechanism includes a worktable with a forming boss. A central clamping assembly is located at the upper end of the forming boss. Bending assemblies are simultaneously positioned above both sides of the forming boss on the worktable. The worktable provides the installation foundation and load-bearing platform for the entire mechanism. The forming boss serves as the reference support for bending the sheet metal, and its shape matches the inner contour of the bent sheet metal to ensure consistency in the bending shape. The central clamping assembly is used to fix the middle area of ​​the sheet metal, providing a stable reference fulcrum for segmented bending and preventing the sheet metal from shifting or rotating during the bending process. The bending assemblies on both sides can simultaneously or separately bend both sides of the sheet metal, meeting the process requirements of segmented bending and improving processing efficiency.

[0009] Sliding clamping seats on both sides: respectively located on both sides of the forming boss, with the bending assembly located between the sliding clamping seats and the forming boss. The sliding clamping seats include a clamping part and a sliding support structure supporting the clamping part. The sliding support structure allows the clamping part to slide in a direction parallel to the length direction of the sheet material. The sliding support structure allows the clamping part to slide synchronously with the longitudinal deformation of the sheet material during bending, avoiding deformation or cracking caused by additional stress inside the sheet material due to rigid constraints. The sliding direction is parallel to the length direction of the sheet material, conforming to the natural deformation trend of the sheet material during bending.

[0010] Sliding limiting mechanism: In cooperation with the sliding support structure, it includes a limiting block disposed on the movement path of the sliding support structure and a limiting engagement part disposed on the sliding support structure and cooperating with the limiting block; the limiting block and the limiting engagement part limit the maximum sliding stroke of the sliding support structure through mechanical contact, which can prevent the sliding clamp from exceeding the preset sliding range due to inertia or excessive deformation force of the plate, prevent the plate from being overstretched or compressed, and protect the mechanism from impact damage, ensuring that the deformation of each bend is within a controllable range, and ensuring the consistency of segmented bending dimensions.

[0011] Reset Mechanism: Connected between the sliding clamp and the fixed part of the worktable, it includes a spring and connectors connecting the two ends of the spring to the sliding clamp and the fixed part of the worktable, respectively. The spring stores and releases energy through its elastic deformation. When the sliding clamp slides with the bending of the sheet metal, the spring is stretched or compressed, accumulating elastic potential energy. When the bending force disappears, the elastic potential energy of the spring is converted into the reset force of the sliding clamp, causing it to return to its initial position.

[0012] Furthermore, the intermediate clamping assembly includes a clamping block corresponding to the forming boss and a first hydraulic cylinder for controlling the lifting and lowering of the clamping block. The clamping block corresponds vertically to the forming boss, and the clamping and loosening of the sheet metal is achieved by lifting and lowering the clamping block. The lower end face of the clamping block is parallel to the upper end face of the forming boss, ensuring that the clamping force is evenly distributed on the sheet metal and avoiding local pressure damage. The first hydraulic cylinder, as a power source, has the characteristics of large output force and stable operation. The clamping force can be adjusted through the hydraulic system according to the thickness and material of the sheet metal, which can ensure firm clamping and prevent over-clamping that could cause deformation of the sheet metal.

[0013] Furthermore, the bending assembly includes a second hydraulic cylinder and a bending block. The bending block is located above the side of the forming boss and cooperates with the side end of the forming boss to perform bending. The second hydraulic cylinder provides the driving force required for bending. The extension and retraction of its piston drives the bending block to move up and down. By controlling the stroke of the hydraulic cylinder, the pressing depth of the bending block can be precisely controlled, thereby controlling the bending angle of the sheet metal. The shape of the lower end face of the bending block is adapted to the shape of the side end of the forming boss. The two form a punch and die cooperation relationship in the bending die. When the bending block presses down, the sheet metal undergoes plastic deformation under the extrusion action of the two, forming the required bending angle.

[0014] Furthermore, the sliding support structure includes a slide rail and a sliding seat. The slide rail is fixed to the worktable in a direction parallel to the length of the sheet material. The sliding seat slides in conjunction with the slide rail, and the clamping part is fixed to the sliding seat. The slide rail and the sliding seat form a low-friction sliding pair. The guiding accuracy of the slide rail ensures that the sliding seat moves in a preset direction (parallel to the length of the sheet material), preventing the sliding clamping seat from shifting or jamming during the sliding process.

[0015] Furthermore, the clamping part includes two opposing clamping plates forming a clamping space between them. One clamping plate is fixedly connected to a sliding seat, and the other clamping plate is connected to a third hydraulic cylinder that controls its movement and clamping. The third hydraulic cylinder is fixedly mounted on the sliding seat. The clamping space formed by the two opposing clamping plates can accommodate plates of different widths. The fixed clamping plate provides a reference positioning, and the movable clamping plate opens and closes the clamping space under the drive of the third hydraulic cylinder. The thrust of the third hydraulic cylinder can be adjusted through the hydraulic system to ensure reliable clamping of plates of different thicknesses while avoiding excessive clamping force that could damage the surface of the plate. Fixing the third hydraulic cylinder to the sliding seat makes the overall structure of the clamping part compact. The movement direction of the movable clamping plate is perpendicular to the sliding direction of the sliding seat, ensuring that the direction of the clamping force is consistent with the direction of force on the plate, thus improving the stability of the clamping.

[0016] Furthermore, the limiting block is fixed on the worktable, and the limiting mating part is disposed on the side end face of the sliding support structure. The limiting mating part and the limiting block are disposed opposite to each other in the sliding direction, and the limiting block is disposed on the side of the sliding clamping seat near the forming boss. The limiting block is fixed on the worktable, providing a fixed reference boundary for the sliding stroke.

[0017] Furthermore, the reset mechanism is located on the side of the sliding clamping seat near the forming boss.

[0018] Furthermore, the reset mechanism also includes a guide post, which is fixedly connected to the worktable. The sliding seat is slidably connected to the guide post, and the spring is sleeved on the guide post, with both ends of the spring fixedly connected to the worktable fixing part and the sliding clamping seat, respectively. The guide post provides additional guiding constraints for the sliding of the sliding seat, forming a double guide together with the slide rail, further improving the motion accuracy of the sliding seat. The spring sleeved on the guide post restricts the lateral offset and torsion of the spring during the extension and contraction process, ensuring that the spring force always acts in the axial direction, improving the stability of the reset force and the service life of the reset mechanism, while preventing the spring from getting entangled or colliding with other components.

[0019] Beneficial effects: By combining the sliding clamps on both sides with the sliding support structure, the problem of large swing of the plate caused by the lack of fixation at both ends is avoided. At the same time, the plate ends slide synchronously with the bending deformation, eliminating the additional stress caused by rigid constraints. The bending angle deviation can be controlled within ±0.3°. Attached Figure Description

[0020] Figure 1 This is a perspective view of the present invention;

[0021] Figure 2 This is a partial enlarged view of the present invention;

[0022] Figure 3 This is a perspective view of the utility model in cross-section;

[0023] Figure 4 This is a cross-sectional view of the present invention;

[0024] 1: Segmented bending mechanism main body; 11: Worktable; 12: Forming boss; 13: Intermediate clamping assembly; 131: Clamping block; 132: First hydraulic cylinder; 14: Bending assembly; 141: Second hydraulic cylinder; 142: Bending pressure block; 2: Side sliding clamping seats; 21: Clamping part; 211: Clamping piece; 212: Third hydraulic cylinder; 22: Sliding support structure; 221: Slide rail; 222: Sliding seat; 3: Sliding limiting mechanism; 31: Limiting block; 32: Limiting mating part; 4: Reset mechanism; 41: Spring; 42: Guide column. Detailed Implementation

[0025] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1

[0027] As shown in the figure, a segmented bending mechanism for a CNC bending machine includes...

[0028] The main body 1 of the segmented bending mechanism includes a worktable 11, on which a forming boss 12 is provided. An intermediate clamping component 13 is provided at the upper end of the forming boss 12. Bending components 14 are simultaneously provided on both sides of the worktable 11 above the forming boss 12. The worktable 11 provides the installation foundation and bearing platform for the entire mechanism. The forming boss 12 serves as the reference support for bending the sheet metal, and its shape is adapted to the inner contour of the bent sheet metal to ensure the consistency of the bending shape. The intermediate clamping component 13 is used to fix the middle area of ​​the sheet metal, providing a stable reference fulcrum for segmented bending and preventing the sheet metal from shifting or rotating during the bending process. The bending components 14 on both sides can perform bending operations on both sides of the sheet metal simultaneously or separately, meeting the process requirements of segmented bending and improving processing efficiency.

[0029] Two sliding clamping seats 2: respectively disposed on both sides of the forming boss 12, and the bending assembly 14 disposed between the sliding clamping seats 2 and the forming boss 12. The sliding clamping seat 2 includes a clamping part 21 and a sliding support structure 22 supporting the clamping part 21. The sliding support structure 22 enables the clamping part 21 to slide in a direction parallel to the length direction of the plate. The sliding support structure 22 allows the clamping part 21 to slide synchronously with the longitudinal deformation of the plate during bending, avoiding deformation or cracking caused by additional stress inside the plate due to rigid constraints. The sliding direction is parallel to the length direction of the plate, which conforms to the natural deformation trend of the plate during bending.

[0030] Sliding limiting mechanism 3: cooperates with the sliding support structure 22, including a limiting block 31 disposed on the movement path of the sliding support structure 22 and a limiting engagement part 32 disposed on the sliding support structure and cooperating with the limiting block 31; the limiting block 31 and the limiting engagement part 32 limit the maximum sliding stroke of the sliding support structure through mechanical contact, which can prevent the sliding clamp 2 from exceeding the preset sliding range due to inertia or excessive deformation force of the plate, prevent the plate from being overstretched or compressed, and protect the mechanism from impact damage, ensuring that the deformation of each bend is within a controllable range, and ensuring the consistency of the segmented bending dimensions.

[0031] Reset mechanism 4: Connected between the sliding clamp 2 and the fixed part of the worktable 11, it includes a spring 41 and connecting parts connecting the two ends of the spring 41 to the sliding clamp and the fixed part of the worktable respectively. The spring stores and releases energy through its elastic deformation. When the sliding clamp 2 slides with the bending of the plate, the spring 41 is stretched or compressed, accumulating elastic potential energy. When the bending force disappears, the elastic potential energy of the spring 41 is converted into the reset force of the sliding clamp 2, causing it to return to its initial position. The connecting parts can be a combination of bolts and nuts. Mounting holes are opened at both ends of the spring, and threaded holes are correspondingly provided on the fixed part of the worktable and the sliding clamp. The bolt passes through the mounting hole at the end of the spring and engages with the threaded hole, and is then locked by the nut, thereby fixing the two ends of the spring to the fixed part of the worktable and the sliding clamp respectively.

[0032] Furthermore, the intermediate clamping assembly 13 includes a clamping block 131 corresponding to the forming boss and a first hydraulic cylinder 132 for controlling the lifting and lowering of the clamping block. The clamping block 131 is vertically aligned with the forming boss 12, and the clamping and loosening of the plate is achieved by lifting and lowering the clamping block 131. The lower end face of the clamping block 131 is parallel to the upper end face of the forming boss 12, ensuring that the clamping force is evenly distributed on the plate and avoiding local pressure damage. The first hydraulic cylinder 132, as a power source, has the characteristics of large output force and stable operation. The clamping force can be adjusted through the hydraulic system according to the thickness and material of the plate, which can ensure firm clamping and prevent over-clamping that could cause deformation of the plate.

[0033] Furthermore, the bending assembly 14 includes a second hydraulic cylinder 141 and a bending block 142. The bending block 142 is located above the side of the forming boss 12 and cooperates with the side end of the forming boss 12 to perform bending. The second hydraulic cylinder 141 provides the driving force required for bending. The extension and retraction of its piston drives the bending block to move up and down. By controlling the stroke of the second hydraulic cylinder 141, the pressing depth of the bending block 142 can be precisely controlled, thereby controlling the bending angle of the sheet metal. The shape of the lower end face of the bending block 142 is adapted to the shape of the side end of the forming boss 12. The two form a punch and die cooperation relationship of the bending die. When the bending block 142 presses down, the sheet metal undergoes plastic deformation under the extrusion action of the two, forming the required bending angle.

[0034] Furthermore, the sliding support structure 22 includes a slide rail 221 and a sliding seat 222. The slide rail 221 is fixed on the worktable 11 in a direction parallel to the length direction of the plate. The sliding seat 222 is slidably engaged with the slide rail 221, and the clamping part 21 is fixed on the sliding seat. The slide rail and the sliding seat form a low-friction sliding pair. The guiding accuracy of the slide rail ensures that the sliding seat moves in a preset direction (parallel to the length direction of the plate), preventing the sliding clamping seat from shifting or jamming during the sliding process.

[0035] Furthermore, the clamping part 21 includes two opposing clamping plates 211, forming a clamping space between them. One clamping plate is fixedly connected to the sliding seat, and the other clamping plate is connected to a third hydraulic cylinder 212 that controls its movement and clamping. The third hydraulic cylinder is fixedly mounted on the sliding seat. The clamping space formed by the two opposing clamping plates can accommodate plates of different widths. The fixed clamping plate provides a reference positioning, and the movable clamping plate opens and closes the clamping space under the drive of the third hydraulic cylinder 212. The thrust of the third hydraulic cylinder 212 can be adjusted by the hydraulic system to ensure reliable clamping of plates of different thicknesses while avoiding excessive clamping force that could damage the surface of the plate. Fixing the third hydraulic cylinder to the sliding seat makes the overall structure of the clamping part compact. The movement direction of the movable clamping plate is perpendicular to the sliding direction of the sliding seat, ensuring that the direction of the clamping force is consistent with the direction of force on the plate, thus improving the stability of the clamping.

[0036] Furthermore, the limiting block 31 is fixed on the worktable 11, and the limiting mating part 32 is disposed on the side end face of the sliding support structure. The limiting mating part 32 and the limiting block 31 are disposed opposite each other in the sliding direction. The limiting block is disposed on the side of the sliding clamping seat near the forming boss 12. The limiting block is fixed on the worktable, providing a fixed reference boundary for the sliding stroke.

[0037] Furthermore, the reset mechanism 4 is located on the side of the sliding clamping seat near the forming boss 12.

[0038] Furthermore, the reset mechanism 4 also includes a guide post 42, which is fixedly connected to the worktable 11. The sliding seat 222 is slidably connected to the guide post 42. The spring 41 is sleeved on the guide post, and both ends of the spring 41 are fixedly connected to the fixed part of the worktable 11 and the sliding clamping seat, respectively. The guide post 42 provides additional guiding constraints for the sliding of the sliding seat 222, forming a double guide together with the slide rail, further improving the movement accuracy of the sliding seat. The spring sleeved on the guide post 42 can limit the lateral displacement and torsion of the spring 41 during the extension and retraction process, ensuring that the spring force always acts in the axial direction, improving the stability of the reset force and the service life of the reset mechanism, while avoiding the spring from getting entangled or colliding with other components.

[0039] Working principle: In use, the sheet material to be bent is placed on the forming boss 12, with the middle area of ​​the sheet material aligned with the middle clamping assembly 13, and the two sides extending between the clamping parts 21 of the two sliding clamping seats 2. The first hydraulic cylinder 132 of the middle clamping assembly 13 is activated, driving the clamping block 131 to move downward until the clamping block 131 cooperates with the forming boss 12 to clamp and fix the middle position of the sheet material. At this time, the middle point of the sheet material is located, serving as the reference for subsequent segmented bending. Subsequently, the third hydraulic cylinder 212 of the two sliding clamping seats 2 is activated, pushing the movable clamping piece towards the fixed clamping piece, so that the two clamping pieces 211 clamp the two ends of the sheet material. Through the three-point clamping of the middle and the two ends, it is ensured that the sheet material is in a flat and secure state before bending.

[0040] When the sheet metal needs to be bent in sections, the second hydraulic cylinder 141 on one or both sides of the forming boss 12 is activated according to the bending process requirements. Its piston rod extends, driving the bending pressure block 142 downwards. The bending pressure block 142 engages with the side end of the forming boss 12, applying downward pressure to the corresponding area of ​​the sheet metal. Under this pressure, the sheet metal undergoes plastic deformation around the side end of the forming boss, forming the required bending angle. During the bending process, the sheet metal will experience a compression tendency along its length due to bending deformation. This tendency will exert a horizontal force on the sliding clamps on both sides, causing the sliding seat 222 to slide along the slide rail 221 towards the forming boss 12, thereby releasing the internal stress of the sheet metal and preventing defects such as wrinkles and cracks. Simultaneously, the limiting engagement part on the side of the sliding support structure 22 moves synchronously with the sliding seat. When the limiting engagement part contacts the limiting block, the sliding seat stops sliding, preventing excessive deformation of the sheet metal.

[0041] After bending is completed, the third hydraulic cylinder 212 first contacts the limit at both ends of the plate to avoid secondary stretching of the plate. At this time, the compressed spring 41 in the reset mechanism 4 releases its elastic potential energy and pushes the sliding seat 222 along the slide rail 221 and guide post 42 to slide to the initial position under the action of elastic force until the sliding clamping seat returns to the position before bending, preparing for the next bending section. Then the piston rod of the second hydraulic cylinder 141 retracts, driving the bending pressure block 142 to move upward back to the initial position, releasing the bending pressure on the plate. At the same time or afterward, the first hydraulic cylinder drives the clamping block to rise, releasing all restrictions on the plate.

[0042] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A segmented bending mechanism for a CNC bending machine, characterized in that, include The main body of the segmented bending mechanism includes a worktable, which is provided with a forming boss. An intermediate clamping component is provided at the upper end of the forming boss, and bending components are provided on both sides above the forming boss on the worktable. Two sliding clamping seats: respectively disposed on both sides of the forming boss, and the bending component is disposed between the sliding clamping seats and the forming boss. The sliding clamping seat includes a clamping part and a sliding support structure that supports the clamping part. The sliding support structure enables the clamping part to slide in a direction parallel to the length direction of the plate. Sliding limiting mechanism: cooperating with the sliding support structure, including a limiting block disposed on the movement path of the sliding support structure and a limiting mating part disposed on the sliding support structure and cooperating with the limiting block; Reset mechanism: connected between the sliding clamp and the worktable fixing part, including a spring and a connector connecting the two ends of the spring to the sliding clamp and the worktable fixing part respectively.

2. The segmented bending mechanism of a CNC bending machine according to claim 1, characterized in that, The intermediate clamping assembly includes a clamping block corresponding to the forming boss and a first hydraulic cylinder for controlling the lifting and lowering of the clamping block.

3. The segmented bending mechanism of a CNC bending machine according to claim 1, characterized in that, The bending assembly includes a second hydraulic cylinder and a bending block. The bending block is located above the side of the forming boss and cooperates with the side end of the forming boss to perform bending.

4. The segmented bending mechanism of a CNC bending machine according to claim 1, characterized in that, The sliding support structure includes a slide rail and a sliding seat. The slide rail is fixed on the worktable in a direction parallel to the length of the plate. The sliding seat slides in conjunction with the slide rail. The clamping part is fixed on the sliding seat.

5. The segmented bending mechanism of a CNC bending machine according to claim 4, characterized in that, The clamping part includes two opposing clamping plates, forming a clamping space between the two clamping plates. One clamping plate is fixedly connected to the sliding seat, and the other clamping plate is connected to a third hydraulic cylinder that controls its movement and clamping. The third hydraulic cylinder is fixedly mounted on the sliding seat.

6. The segmented bending mechanism of a CNC bending machine according to claim 1, characterized in that, The limiting block is fixed on the worktable, and the limiting mating part is set on the side end face of the sliding support structure. The limiting mating part and the limiting block are arranged opposite to each other in the sliding direction. The limiting block is set on the side of the sliding clamping seat near the forming boss.

7. The segmented bending mechanism of a CNC bending machine according to claim 1, characterized in that, The reset mechanism is located on the side of the sliding clamping seat near the forming boss.

8. A segmented bending mechanism for a CNC bending machine according to claim 1 or 7, characterized in that, The reset mechanism also includes a guide post, which is fixedly connected to the worktable. The sliding seat is slidably connected to the guide post. The spring is sleeved on the guide post, and both ends of the spring are fixedly connected to the worktable fixing part and the sliding clamping seat, respectively.

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