A bending die for bending an upper and lower folding arm U-shaped plate

Abstract

This utility model provides a bending die for bending U-shaped plates with upper and lower folding arms, including a cutting tool, a cutting tool holder, a limiting plate, a screw, and a baffle. The cutting tool has a cylindrical structure, and a through slot is opened in the center of the cutting tool holder. The limiting plate is located on both sides of the inner wall of the slot. Threaded holes are opened on both sides of the slot, and screws are inserted into them. One end of the screw is movably connected to the limiting plate, and the other end extends to the outside of the cutting tool holder. The baffle is located at both ends of the cutting tool holder to form a semi-closed structure. The bending die for bending U-shaped plates with upper and lower folding arms of this utility model realizes continuous adjustment of the slot width and precise positioning of the limiting plate through a screw adjustment mechanism. Combined with the guiding forming design of the inward inclined slope structure, it effectively solves the technical problems of frequent replacement and unstable bending accuracy of traditional fixed slot width dies, significantly improving production efficiency, processing accuracy, and product quality consistency.

Description

Technical Field

[0001] This utility model relates to the field of metal sheet processing, and in particular to a bending die for bending U-shaped plates with upper and lower folding arms. Background Technology

[0002] As an important aerial work platform, the spider crane's structural stability and operational safety directly affect the lives of operators and work efficiency. Among the key structural components of the spider crane, the upper and lower folding arm U-shaped plates are crucial components of the connection and support mechanism. Their machining accuracy and shape precision have a decisive impact on the overall mechanical performance, motion accuracy, and service life of the machine. The bending process of the U-shaped plates needs to ensure the accuracy of the bending angle, the straightness of the bending line, and the symmetry of the two arms. These technical requirements place high demands on the design and manufacturing of the bending dies.

[0003] In existing U-shaped plate bending technology, traditional bending dies typically employ a fixed groove width design, meaning the working groove width of the die cannot be adjusted after manufacturing. This design presents several technical problems: First, when processing U-shaped plates of different specifications or bending angles, corresponding die specifications must be replaced. This not only increases the manufacturing cost and inventory burden of the die but also prolongs production preparation time and reduces production efficiency. Second, dies with fixed groove widths struggle to adapt to minute differences in plate thickness or subtle adjustments to process requirements, easily leading to quality issues such as inaccurate bending angles, uneven bending lines, or scratches on the plate surface. Furthermore, during use, traditional dies cannot be fine-tuned according to actual processing conditions, often requiring operators to rely on experience and manual adjustments to compensate for processing errors. This not only increases reliance on operator skills but also makes it difficult to guarantee the consistency and stability of product quality in mass production.

[0004] Therefore, how to design a bending die with adjustable groove width to achieve universal processing of U-shaped plates of different specifications, improve bending accuracy and processing efficiency, reduce the frequency of die replacement and dependence on operating skills, is a technical problem that urgently needs to be solved in the field of metal sheet bending processing. Utility Model Content

[0005] The technical problem to be solved by this utility model is to solve the technical problems of fixed groove width of bending die in the prior art, which cannot adapt to the processing needs of U-shaped plates of different specifications and the bending accuracy is difficult to guarantee. The present invention provides a bending die with adjustable groove width and strong versatility for bending upper and lower U-shaped plates.

[0006] The technical solution adopted by this utility model to solve its technical problem is: A bending die for bending a U-shaped plate with upper and lower folding arms includes a cutting tool, a cutting tool holder, a limiting plate, a screw, and a baffle. The cutting tool has a cylindrical structure, and a through slot is opened in the center of the cutting tool holder, with the cutting tool positioned above the slot. The limiting plate is located on both sides of the inner wall of the slot. Threaded holes are opened on both walls of the slot, and a screw is inserted into the threaded holes. One end of the screw is movably connected to the limiting plate, and the other end extends to the outside of the cutting tool holder. The baffle is located at both ends of the cutting tool holder.

[0007] Preferably, the limiting plate is movably connected to the tool holder and moves towards or away from each other inside the slot via a screw.

[0008] Preferably, the limiting plate is engaged with the screw.

[0009] Preferably, a spherical nut is provided at one end of the screw that is connected to the limiting plate, and a spherical nut holder is installed on the outer surface of the limiting plate on the side opposite to the tool holder, and the spherical nut of the screw is engaged in the spherical nut holder of the limiting plate.

[0010] Preferably, the upper end of the limiting plate has an inwardly sloping structure.

[0011] Preferably, an operating handle is provided at one end of the screw that extends outside the tool holder.

[0012] Preferably, the baffle forms a semi-closed structure by sealing the slot.

[0013] The beneficial effects that this utility model can achieve are: By opening threaded holes on both sides of the slot and inserting screws, one end of the screw is movably connected to the limiting plate and the other end extends to the outside of the tool holder to form an adjustment mechanism. With the movement of the limiting plate in opposite directions or back to back inside the slot, the slot width can be continuously adjusted, so that a single set of cutting molds can adapt to the processing needs of U-shaped plates of various specifications. This effectively solves the problems of high manufacturing cost of cutting molds, heavy inventory burden and long production preparation time, and significantly improves production efficiency and equipment utilization.

[0014] By setting an inwardly inclined slope structure at the upper end of the limiting plate, and in conjunction with the engaging connection between the spherical nut and the spherical nut holder, a precise groove width adjustment and guiding forming system is formed. This achieves accurate control of the bending angle and ensures the straightness of the bending line, effectively solving the technical problems of inaccurate bending angle, uneven bending line, and poor surface quality, and ensuring the consistency and stability of product quality in mass production. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the bending die for bending the upper and lower U-shaped plates in Example 1; Figure 2 This is a schematic diagram of the connection structure between the screw and the limiting plate in Example 1.

[0016] Reference numerals: 1. Cutting tool; 2. Tool holder; 21. Groove; 3. Limiting plate; 31. Sloping structure; 32. Ball nut holder; 4. Screw; 41. Ball nut; 42. Operating handle; 5. Baffle; 6. U-shaped plate; 7. Hydraulic device. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, but these specific embodiments do not limit the scope of protection of the present invention in any way. Example

[0018] See Figure 1-2 A bending die for bending a U-shaped plate with upper and lower folding arms, the bending die mainly consists of a cutting tool 1, a cutting tool holder 2, a limiting plate 3, a screw 4, and a baffle 5.

[0019] The cutter 1 has a cylindrical structure, with the upper part connected to the hydraulic device 7, which lifts and lowers it under the action of the hydraulic device 7, and the lower part aligned with the cutter holder 2. The cutter 1 itself is made of high-strength tool steel, and its diameter is designed according to the specifications of the U-shaped plate 6 of the upper and lower folding arms of the spider car. In this embodiment, the diameter of the cutter 1 is Φ96.

[0020] The cutter holder 2 is the main structure of the entire bending die. A through slot 21 is machined in the center of the cutter holder 2. The slot 21 is 100mm deep and 148mm wide, which can meet the bending depth requirements of U-shaped plates 6 of different thicknesses. The cross-section of the slot 21 is rectangular, and its length direction is perpendicular to the length direction of the U-shaped plate 6 to be processed.

[0021] The limiting plates 3 are positioned opposite each other on both sides of the inner wall of the slot 21. The upper end of the limiting plates 3 is an inwardly inclined slope structure 31, which is used to assist the bending of the upper and lower folding arm U-shaped plates 6 and prevent unnecessary indentations during the bending process. A ball nut holder 32 is installed on the outer surface of the limiting plates 3 on the side opposite to the tool holder 2. The limiting plates 3 are movably connected to the tool holder 2 and can move towards or away from each other inside the slot 21 through the screw 4.

[0022] A pair of threaded holes are provided on each of the two walls of the slot 21, for a total of four threaded holes. A screw 4 is inserted into each threaded hole. One end of the screw 4 is a spherical nut 41, which passes through the threaded hole and engages with the spherical nut holder 32 of the limiting plate 3. During the engagement movement of the screw 4 with the threaded hole, the spherical nut 41 rotates within the spherical nut holder 32, pushing the limiting plate 3 to move. The other end of the screw 4 extends to the outside of the tool holder 2 and is equipped with an operating handle 42 for easy adjustment by the operator. The screw 4 is engraved with scale markings at 0.5mm intervals, allowing the operator to accurately read and set the slot width value.

[0023] The baffle 5 is set at both ends of the tool holder 2. The baffle 5 adopts a flat plate structure, which can provide a stable support platform for the U-shaped plate 6 to be processed, and prevent it from slipping or shifting out of the entire slot 21 during the bending process. Therefore, the slot 21 is sealed at both ends of the tool holder 2 by the baffle 5, forming a semi-closed structure.

[0024] The specific working method of the bending die for bending the upper and lower U-shaped plates 6 in this embodiment is as follows: First, determine the required groove width based on the specifications of the U-shaped plate 6 to be processed. By rotating the operating handle 42 on the screw 4, the screw 4 is driven to rotate within the threaded hole of the tool holder 2. Since the ball nut 41 at one end of the screw 4 engages with the ball nut holder 32 on the limiting plate 3, the rotational motion of the screw 4 is converted into its own axial linear motion through engagement with the threaded hole. During this process, the ball nut 41 rotates only within the holder and does not transmit torsional force to the limiting plate 3. Instead, it directly applies the axial thrust or tension of the screw 4 to the limiting plate 3, thereby driving it to move in opposite directions or in opposite directions within the groove 21, thus adjusting the distance (i.e., the groove width) between the two limiting plates 3. The operator can accurately set the groove width value using the 0.5mm graduations on the screw 4.

[0025] Next, the U-shaped plate 6 blank to be bent is placed inside the groove 21, positioned between the two baffles 5, ensuring that the bending line of the U-shaped plate 6 is perpendicular to the length direction of the groove 21. The presence of the baffles 5 prevents the U-shaped plate 6 from slipping and shifting position during processing, forming a stable support platform.

[0026] Then, the hydraulic device 7 is activated to control the downward movement of the cutter 1. When the cylindrical cutter 1 with a diameter of Φ96 contacts the U-shaped plate 6, bending force continues to be applied, and the U-shaped plate 6 begins to deform under the action of the cutter 1. Due to the guiding effect of the inwardly inclined slope structure 31 at the upper end of the limiting plate 3, the two side arms of the U-shaped plate 6 smoothly bend downward along the slope of the limiting plate 3, forming a standard U-shaped structure. The bending angle is controlled by the downward stroke of the cutter 1, which is usually precisely controlled by the pressure and stroke control system of the hydraulic device 7.

[0027] During the bending process, the groove width directly affects the forming angle and shape of the U-shaped plate 6. By precisely adjusting the groove width, the forming requirements of U-shaped plates 6 of different specifications and angles can be met, adapting to the diverse processing needs of the U-shaped plates 6 of the upper and lower folding arms of the spider car.

[0028] Finally, once the preset bending angle is reached, the hydraulic device 7 drives the cutter 1 to return, removing the formed U-shaped plate 6. The semi-enclosed structure of the baffle 5 ensures stable positioning of the workpiece throughout the entire processing, improving processing accuracy and product quality.

[0029] The core of this working principle lies in the precise adjustment of the groove width achieved through the adjustment mechanism that works in conjunction with the ball nut 41 and the screw 4. Combined with the uniform force characteristics of the cylindrical cutter 1 and the guiding effect of the slope structure 31 of the limiting plate 3, and the stable support of the baffle 5, high-precision and high-quality bending processing of the U-shaped plate 6 is achieved, effectively solving the technical problems of poor adaptability and unstable positioning of traditional fixed groove width die.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any innovative improvements or substitutions based on the present invention should fall within the scope of the claims of the present invention. Furthermore, the parameters, materials, and processes mentioned in the above embodiments are not unique. Without departing from the technical essence of the present invention, those skilled in the art can make various alternative choices, and these alternative solutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A bending die for bending a U-shaped plate with upper and lower folding arms, characterized in that: It includes a cutting tool, a tool holder, a limiting plate, a screw, and a baffle. The cutting tool has a cylindrical structure, and a through slot is opened in the center of the tool holder. The cutting tool is positioned above the slot. The limiting plate is located on both sides of the inner wall of the slot. Threaded holes are opened on both walls of the slot, and a screw is inserted into the threaded holes. One end of the screw is movably connected to the limiting plate, and the other end extends to the outside of the tool holder. The baffle is located at both ends of the tool holder.

2. The bending die according to claim 1, characterized in that: The limiting plate is movably connected to the tool holder and moves towards or away from each other inside the slot via a screw.

3. The bending die according to claim 2, characterized in that: The limiting plate is engaged with the screw.

4. The bending die according to claim 3, characterized in that: The end of the screw connected to the limiting plate is provided with a spherical nut. The limiting plate has a spherical nut holder on its outer surface opposite to the tool holder. The spherical nut of the screw is locked in the spherical nut holder of the limiting plate.

5. The bending die according to claim 1, characterized in that: The upper end of the limiting plate has an inwardly sloping structure.

6. The bending die according to claim 1, characterized in that: An operating handle is provided at one end of the screw that extends outside the tool holder.

7. The bending die according to claim 1, characterized in that: The baffle forms a semi-closed structure by sealing the slot.

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