A die for bending a closed structure and a method of use

Abstract

This invention discloses a mold and processing method for bending closed structures, relating to the field of closed bending technology for sheet metal parts. The mold, located at the bottom of a bending machine, includes an upper mold body and a lower mold body. This invention's mold for bending closed structures allows for rapid closed bending operations on sheet metal parts, precisely controlling the bending angle and shape to ensure accuracy and consistency in each bend. It also reduces reliance on complex processes such as welding and riveting, lowering product costs and production cycles. The mold's hollowed-out design in the middle of the upper mold body effectively avoids interference caused by the closed structure of the bent part during bending, facilitating the removal of the closed bent part from the rotating beam assembly, reducing operational difficulty, and improving operational convenience and safety. It meets the process requirements for closed bending of sheet metal parts.

Description

Technical Field

[0001] This invention belongs to the field of closed bending technology for sheet metal parts, specifically a mold for a closed bending structure and its usage method. Background Technology

[0002] Bending is one of the most important and widely used techniques in sheet metal manufacturing. The basic principle of sheet metal bending is to use the plastic deformation of metal to manufacture parts or components of the required shape and size. In many sheet metal structural products, bending can replace some complex component structures such as welding, riveting, and bolting. Compared with welding, riveting, and bolting, bending makes it easier to precisely control the shape and size of the sheet metal, and also has higher accuracy and repeatability.

[0003] In related technologies, bending machines and dies are typically used during the bending process of sheet metal parts. Square and round tubes are the most common parts to be bent in sheet metal bending. The bending cross-section of these parts needs to be processed into a semi-closed or fully closed structure. However, conventional bending dies and processes cannot completely complete the bending of these parts. Welding, riveting, and bolting are often used as substitutes for bending, but this alters the original design, leading to increased product costs and extended manufacturing cycles. Furthermore, commonly used bending dies suffer from interference problems, such as difficulty in removing the part from the die after a closed bend or the inability to perform a closed bend at all.

[0004] Therefore, there is an urgent need for a mold and method for using a closed bending structure, which can quickly perform closed bending on sheet metal parts, while avoiding interference problems such as the part being difficult to remove from the mold or being unable to be closed bent after being closed bent, thus meeting the process requirements for closed bending of sheet metal parts. Summary of the Invention

[0005] The purpose of this invention is to provide a mold for bending a closed structure and a method for using it, so as to solve at least one aspect of the problems and defects mentioned in the background art.

[0006] Specifically, the first aspect of this invention discloses a mold for bending a closed structure, disposed at the bottom of a bending machine, comprising:

[0007] Upper mold body and lower mold body;

[0008] The upper mold body has a hollowed-out center, dividing it into a left mold body and a right mold body, with the height of the left mold body being greater than the height of the right mold body;

[0009] A groove is provided near the bottom of the left mold body, and a rotating beam assembly is rotatably installed in the groove;

[0010] A locking groove is provided on one side of the right mold body, a locking component is provided in the locking groove, and a locking hole is provided at the bottom of the right mold body, which is connected to the locking groove.

[0011] A positioning and retraction assembly is provided on the other side of the right mold body. The rotating beam assembly is locked between the locking assembly and the positioning and retraction assembly in the locked state.

[0012] The bottom of the rotating beam assembly is provided with a mold cutter body;

[0013] The lower mold body has a processing groove along its length in the middle for bending the workpiece, and the mold cutter body is disposed in the processing groove.

[0014] The mold with the bending closed structure according to the present invention has at least the following beneficial effects:

[0015] The mold with the closed bending structure of this invention can quickly perform closed bending operations on sheet metal parts, accurately control the bending angle and shape of the parts, ensure the accuracy and consistency of each bending, and reduce the reliance on complex processes such as welding and riveting, thereby reducing product costs and production cycles. It makes the bending process smoother and more efficient, reduces the bending and debugging time of the parts, and thus improves the overall production efficiency.

[0016] The mold of this invention, featuring a closed bending structure, effectively avoids interference caused by the workpiece being bent into a closed structure during the bending process through a hollow design in the middle of the upper mold body. The height difference between the left and right mold bodies, along with the rotating beam assembly, allows the rotating beam assembly to be effectively fixed between the locking assembly and the positioning and retraction assembly, thereby positioning the mold cutter body at the bottom of the rotating beam assembly and ensuring the accuracy of the workpiece bending operation. Furthermore, after the workpiece is bent and closed, the locking of the rotating beam assembly can be quickly released, facilitating the removal of the bent and closed workpiece from the rotating beam assembly, reducing operational difficulty and improving operational convenience and safety. Simultaneously, the mold structure is simple, easy to manufacture and maintain, and can meet the process requirements of closed bending of sheet metal workpieces.

[0017] As a further embodiment of the present invention: bearings are provided on both sides of the groove, and a rotating shaft is provided through one end of the rotating beam assembly, with the two ends of the rotating shaft respectively disposed in the bearings.

[0018] Because bearings are installed on both sides of the groove, and a rotating shaft is installed through one end of the rotating beam assembly, with each end of the shaft corresponding to a bearing, the rotating beam assembly can rotate horizontally within the bearings on both sides of the groove. When bending of the workpiece is required, the rotating beam assembly rotates counterclockwise horizontally, moving it between the locking assembly and the positioning and retraction assembly. This positions and locks the rotating beam assembly, causing it to move the die cutter body above the machining groove of the lower die body, thus allowing pressure bending of the workpiece. After bending, the workpiece forms... The workpiece, in a closed state, is wound around the rotating beam assembly through the hollowed-out part of the upper mold body. After the locking assembly is unlocked, the positioning and retraction assembly pushes the rotating beam assembly out. The rotating beam assembly rotates clockwise in the horizontal direction, making one end of the rotating beam assembly a free end. The workpiece, which is wound around the rotating beam assembly in a closed state, is then taken out from the free end. This mold can perform closed bending operations on the workpiece with precision and flexibility, effectively solving the interference problem that the workpiece is difficult to remove from the mold after closed bending or cannot be closed bent at all. This improves the convenience and flexibility of operation and ensures bending accuracy and efficiency.

[0019] As a further embodiment of the present invention: a boss is provided along the bottom length of the rotating beam assembly, and an installation groove is provided along the top length of the mold cutter body, wherein the rotating beam assembly is connected to the installation groove of the mold cutter body through the boss.

[0020] As a further embodiment of the present invention: the top of the rotating beam assembly is uniformly provided with a plurality of countersunk holes, and the top of the mold cutter body is provided with a plurality of threaded holes corresponding to the plurality of countersunk holes.

[0021] By setting a boss along the bottom length of the rotating beam assembly and a mounting groove along the top length of the die cutter body, the rotating beam assembly is connected to the mounting groove of the die cutter body through the boss. In addition, a number of countersunk holes are evenly provided on the top of the rotating beam assembly, and a number of threaded holes are provided on the top of the die cutter body corresponding to the countersunk holes. This allows the boss displacement or wobbling of the rotating beam assembly to be effectively restricted on both sides of the mounting groove of the die cutter body. At the same time, the rotating beam assembly and the die cutter body are connected by threads through the threaded holes, which can effectively enhance the connection stability and reliability of the rotating beam assembly and the die cutter body, ensure the bending accuracy and consistency of the processed parts, and improve the bending quality of the processed parts.

[0022] As a further embodiment of the present invention: the locking assembly includes a cover plate, a locking block is provided on the inner side of the cover plate, a first spring is provided on the top of the locking block, a protruding strip extends from one side of the locking block, a locking shaft is provided at the bottom of the protruding strip, and a rotating handle is provided on the outer side of the cover plate, the rotating handle being connected to the locking shaft.

[0023] As a further embodiment of the present invention: the bottom of the lock block is provided with an inclined surface, and the bottom of the lock block extends outside the lock hole.

[0024] As a further embodiment of the present invention: the positioning and retraction assembly includes a positioning block, and a hollow cylinder is provided on one side of the positioning block, the hollow cylinder being connected to the positioning block.

[0025] As a further embodiment of the present invention: a second spring is provided inside the hollow cylinder, a spring block is provided on one side of the second spring, and an adjustable screw is provided on the other side of the second spring.

[0026] As a further embodiment of the present invention: a flange is provided on the side of the hollow cylinder near the positioning block, the inner side of the top of the spring block abuts against the flange, and the bottom of the spring block extends to the outside of the positioning block.

[0027] The locking assembly includes a cover plate, a locking block inside the cover plate, a first spring on the top of the locking block, a protruding strip extending from one side of the locking block, a locking shaft at the bottom of the protruding strip, and a rotating handle on the outside of the cover plate connected to the locking shaft. The bottom of the locking block has a bevel, extending beyond the locking hole. The positioning and retraction assembly includes a positioning stop, a hollow cylinder on one side of the positioning stop, and the hollow cylinder communicating with the positioning stop. A second spring is installed inside the hollow cylinder, a spring block on one side of the second spring, and an adjustable screw on the other side of the second spring. A flange is provided on the side of the hollow cylinder near the positioning stop, the inner top of the spring block abuts against the flange, and the bottom of the spring block extends beyond the positioning stop.

[0028] When the rotating beam assembly needs to be locked, it rotates counterclockwise in the horizontal direction. One side of the rotating beam assembly abuts against the inclined surface at the bottom of the locking block, generating a horizontal force. The rotating beam assembly continues to rotate counterclockwise in the horizontal direction, further applying pressure to the inclined surface at the bottom of the locking block. At this time, the horizontal force is converted into a vertical force through the inclined surface, causing the first spring to be compressed and the bottom of the locking block to retract into the locking groove through the lock hole. At this time, the rotating beam assembly continues to rotate counterclockwise in the horizontal direction, and one side of the rotating beam assembly applies a horizontal force to the spring block of the positioning and retracting tool assembly, causing the second spring to be compressed and the spring block to retract into the hollow cylinder. When the rotating beam assembly contacts the inner wall of the positioning stop, the entire rotating beam assembly passes over the bottom of the lock hole. The rebound force of the first spring pushes the locking block out of the lock hole, thus locking the rotating beam assembly between the locking assembly and the positioning and retracting tool assembly, completing the fastening of the rotating beam assembly.

[0029] After the workpiece completes its final closed bend, rotate the rotary handle. The rotary handle drives the locking shaft to rotate, which in turn drives the protrusion on one side of the locking block, causing the entire locking block to move upward. The first spring is compressed, and the bottom of the locking block retracts into the locking groove through the lock hole. At this time, the rotating beam assembly is unlocked, and the rebound force of the second spring pops out the spring block, causing the spring block to push out the rotating beam assembly and rotate clockwise in the horizontal direction, thus unlocking the rotating beam assembly and removing the closed bend workpiece.

[0030] By adjusting the depth of the adjustable screw inside the hollow cylinder, the compression force of the second spring can be adjusted. This allows control over the ejection force of the spring block when the rotating beam assembly is ejected, thereby controlling the speed at which the rotating beam assembly rotates clockwise in the horizontal direction to disengage from the positioning block. This method is applicable to workpieces of different weights, ensuring that the bent and closed workpiece maintains a stable posture on the rotating beam assembly. It prevents the workpiece from shaking or vibrating on the rotating beam assembly due to excessive ejection speed, which could cause wear on both the rotating beam assembly and the workpiece. This effectively improves the stability and safety of the mold when removing parts.

[0031] By setting a flange on the side of the hollow cylinder near the positioning block, and the inner side of the top of the spring block abutting against the flange, the spring block can be effectively limited in length by the flange when it is ejected by the second spring, so as to avoid the spring block being ejected outside the hollow cylinder due to excessive rebound force of the second spring.

[0032] The second aspect of this invention also discloses a method for using a mold for bending a closed structure, comprising the following steps:

[0033] S1. Rotate the rotating beam assembly horizontally counterclockwise to lock the rotating beam assembly between the locking assembly and the positioning and retracting assembly;

[0034] S2. The bending machine drives the mold to perform bending operations on the workpiece. The mold blade presses the workpiece into the processing groove of the lower mold body for bending. After bending the workpiece multiple times, the workpiece is formed into a closed state.

[0035] S3. After the processed part is bent to form a closed shape, the processed part wraps around the rotating beam assembly from the hollow part of the upper mold body;

[0036] S4. Unlock the locking assembly, and the positioning and retraction assembly pushes the rotating beam assembly out in a clockwise horizontal direction to remove the workpiece.

[0037] By using this closed-structure bending mold, sheet metal parts can be bent multiple times quickly and closed-loop bending can be achieved. Compared with traditional bending molds or bending methods, it can effectively avoid interference such as the part being difficult to remove from the mold or unable to be bent in a closed loop after being bent. At the same time, it improves the bending accuracy and efficiency of the part and meets the process requirements of closed-loop bending of sheet metal parts. Attached Figure Description

[0038] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0039] Figure 1 This is a schematic diagram of the exploded structure of a mold with a bent and closed structure.

[0040] Figure 2 A schematic diagram of a mold locking state for a bending closed structure;

[0041] Figure 3 A schematic diagram of the unlocked state structure of a mold with a bent closed structure;

[0042] Figure 4 This is a schematic diagram of the main structure of a mold with a closed bending structure.

[0043] Figure 5 A schematic diagram of a mold with a bent and closed structure, viewed from below.

[0044] Figure 6 A three-dimensional structural diagram of a mold locking assembly with a bent closed structure;

[0045] Figure 7 A side view of a mold locking assembly with a bent and closed structure;

[0046] Figure 8 A three-dimensional structural diagram of a mold positioning and retraction assembly with a closed bending structure;

[0047] Figure 9 A side view sectional diagram of a mold positioning and retraction assembly with a closed bending structure;

[0048] Figure 10 This is a schematic diagram illustrating the principle of a closed-structure bending mold for bending workpieces.

[0049] Figure label:

[0050] 1. Upper mold body; 11. Left mold body; 111. Groove; 112. Bearing; 12. Right mold body; 121. Locking groove; 122. Locking hole; 2. Lower mold body; 21. Machining groove; 3. Rotating beam assembly; 31. Rotating shaft; 32. Boss; 33. Countersunk hole; 4. Locking assembly; 41. Cover plate; 42. Locking block; 421. Inclined surface; 43. First spring; 44. Raised bar; 45. Locking shaft; 46. Rotating handle; 5. Positioning and retracting assembly; 51. Positioning stop; 52. Hollow cylinder; 53. Second spring; 54. Spring block; 55. Adjustable screw; 56. Flange; 6. Mold cutter body; 61. Mounting groove. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. In this specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation thereof.

[0052] Furthermore, in the following detailed description, numerous specific details are set forth for ease of explanation to provide a thorough understanding of the embodiments disclosed herein. However, it will be apparent that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and apparatuses are illustrated to simplify the figures.

[0053] like Figure 1-5 The embodiment of the present invention shown provides a mold for bending a closed structure, disposed at the bottom of a bending machine, comprising: an upper mold body 1 and a lower mold body 2; the upper mold body 1 is hollowed out in the middle, dividing it into a left mold body 11 and a right mold body 12, the height of the left mold body 11 being greater than the height of the right mold body 12; a groove 111 is provided near the bottom of the left mold body 11, and a rotating beam assembly 3 is rotatably disposed within the groove 111; such that when the rotating beam assembly 3 rotates counterclockwise in the horizontal direction to the bottom of the right mold body 12, it fits into the bottom of the right mold body 12; the right mold body... A locking groove 121 is provided on one side of the right mold body 12, and a locking component 4 is provided in the locking groove 121. A locking hole 122 is provided at the bottom of the right mold body 12, and the locking hole 122 communicates with the locking groove 121. A positioning and retraction component 5 is provided on the other side of the right mold body 12. The rotating beam component 3 is locked between the locking component 4 and the positioning and retraction component 5 in the locked state. A mold cutter body 6 is provided at the bottom of the rotating beam component 3. A processing groove 21 for bending the workpiece is provided in the middle of the lower mold body 2 along the length of the lower mold body 2, and the mold cutter body 6 is provided in the processing groove 21.

[0054] Specifically, the mold with the closed bending structure of this invention can quickly perform closed bending operations on sheet metal parts, accurately control the bending angle and shape of the parts, ensure the accuracy and consistency of each bending, and reduce the reliance on complex processes such as welding and riveting, thereby reducing product costs and production cycles, making the bending process smoother and more efficient, reducing bending and debugging time, and thus improving overall production efficiency.

[0055] The mold of this invention with a closed bending structure, through the hollow design in the middle of the upper mold body 1, can effectively avoid interference problems caused by the workpiece being bent into a closed structure during the bending process. The height difference between the left mold body 11 and the right mold body 12, along with the setting of the rotating beam assembly 3, allows the rotating beam assembly 3 to be effectively fixed between the locking assembly 4 and the positioning and retraction assembly 5, thereby positioning the mold cutter body 6 at the bottom of the rotating beam assembly 3 and ensuring the accuracy of the bending operation on the workpiece. Furthermore, after the workpiece is bent and closed, the locking of the rotating beam assembly 3 can be quickly released, facilitating the removal of the bent and closed workpiece from the rotating beam assembly 3, reducing the difficulty of operation and improving the convenience and safety of operation. At the same time, the mold structure is simple, easy to manufacture and maintain, and can meet the process requirements of closed bending of sheet metal workpieces.

[0056] like Figure 1 As shown, bearings 112 are provided on both sides of the groove 111, and a rotating shaft 31 is provided through one end of the rotating beam assembly 3. The two ends of the rotating shaft 31 are respectively provided in the bearings 112.

[0057] Specifically, bearings 112 are provided on both sides of the groove 111, and a rotating shaft 31 is provided through one end of the rotating beam assembly 3. The two ends of the rotating shaft 31 are respectively provided in the bearings 112, so that the rotating beam assembly 3 can rotate horizontally within the bearings 112 on both sides of the groove 111 via the rotating shaft 31. When it is necessary to bend the workpiece, the rotating beam assembly 3 rotates counterclockwise in the horizontal direction, so that the rotating beam assembly 3 can move between the locking assembly 4 and the positioning and retraction assembly 5, positioning and locking the rotating beam assembly 3. This allows the rotating beam assembly 3 to drive the mold cutter body 6 to be positioned above the processing groove 21 of the lower mold body 2, thereby allowing the workpiece to be bent under pressure. After the workpiece is bent, the workpiece, now in a closed state, passes through the hollow part of the upper mold body 1 and wraps around the rotating beam assembly 3. After unlocking the locking assembly 4, the positioning and retraction assembly 5 pushes out the rotating beam assembly 3, which then rotates clockwise in the horizontal direction, making one end of the rotating beam assembly 3 a free end. The workpiece, now in a closed state, is then removed from the free end. This mold can perform closed bending operations on the workpiece with precision and flexibility, effectively solving the interference problem of the workpiece being difficult to remove from the mold or unable to be bent in a closed state after being closed, improving the convenience and flexibility of operation, and ensuring bending accuracy and efficiency.

[0058] like Figure 1 As shown, a boss 32 is provided along the bottom length of the rotating beam assembly 3, and an installation groove 61 is provided along the top length of the mold cutter body 6. The rotating beam assembly 3 is connected to the installation groove 61 of the mold cutter body 6 through the boss 32. A plurality of countersunk holes 33 are evenly provided on the top of the rotating beam assembly 3, and a plurality of threaded holes are provided on the top of the mold cutter body 6 corresponding to the plurality of countersunk holes 33.

[0059] Specifically, by setting a boss 32 along the bottom length of the rotating beam assembly 3 and setting an mounting groove 61 along the top length of the mold cutter body 6, the rotating beam assembly 3 is connected to the mounting groove 61 of the mold cutter body 6 through the boss 32. In addition, a number of countersunk holes 33 are evenly provided on the top of the rotating beam assembly 3, and a number of threaded holes are provided on the top of the mold cutter body 6 corresponding to the countersunk holes 33. This allows the boss displacement or shaking of the rotating beam assembly 3 to be effectively restricted on both sides of the mounting groove 61 of the mold cutter body 6. At the same time, the rotating beam assembly 3 and the mold cutter body 6 are connected by threads through the threaded holes, which can effectively enhance the connection stability and reliability of the rotating beam assembly 3 and the mold cutter body 6, ensure the accuracy and consistency of bending of the processed parts, and improve the bending quality of the processed parts.

[0060] like Figure 6-10 As shown, the locking assembly 4 includes a cover plate 41, a locking block 42 is provided on the inner side of the cover plate 41, a first spring 43 is provided on the top of the locking block 42, a protrusion 44 extends from one side of the locking block 42, a locking shaft 45 is provided at the bottom of the protrusion 44, and a rotating handle 46 is provided on the outer side of the cover plate 41, which is connected to the locking shaft 45; a slope 421 is provided at the bottom of the locking block 42, and the bottom of the locking block 42 extends to the outside of the locking hole 122; the positioning and retraction assembly 5 includes a positioning stop 51, a hollow cylinder 52 is provided on one side of the positioning stop 51, and the hollow cylinder 52 communicates with the positioning stop 51; a second spring 53 is provided inside the hollow cylinder 52, a spring block 54 is provided on one side of the second spring 53, and an adjustable screw 55 is provided on the other side of the second spring 53; a flange 56 is provided on the side of the hollow cylinder 52 near the positioning stop 51, the inner side of the top of the spring block 54 abuts against the flange 56, and the bottom of the spring block 54 extends to the outside of the positioning stop 51.

[0061] When locking the rotating beam assembly 3 is required, the rotating beam assembly 3 rotates counterclockwise in the horizontal direction. One side of the rotating beam assembly 3 abuts against the inclined surface 421 at the bottom of the locking block 42, generating a horizontal force. The rotating beam assembly 3 continues to rotate counterclockwise in the horizontal direction, further applying pressure to the inclined surface 421 at the bottom of the locking block 42. At this time, the horizontal force is converted into a vertical force through the inclined surface 421, causing the first spring 43 to be compressed, and causing the bottom of the locking block 42 to retract into the locking groove 121 through the lock hole 122. At this time, the rotating beam assembly 3... Continuing to rotate counterclockwise in the horizontal direction, one side of the rotating beam assembly 3 applies a horizontal force to the spring block 54 of the positioning and retracting tool assembly 5, causing the second spring 53 to be compressed and the spring block 54 to retract into the hollow cylinder 52; when the rotating beam assembly 3 contacts the inner wall of the positioning stop 51, the rotating beam assembly 3 passes over the bottom of the lock hole 122, and the rebound force of the first spring 43 pushes the locking block 42 out of the lock hole 112, so that the rotating beam assembly 3 is locked between the locking assembly 4 and the positioning and retracting tool assembly 5, thus completing the fastening of the rotating beam assembly 3;

[0062] After the workpiece completes the final closed bend, rotate the rotating handle 46. The rotating handle 46 drives the locking shaft 45 to rotate, and drives the protrusion 44 on one side of the locking block 42, causing the entire locking block 42 to move upward. The first spring 43 is compressed, and the bottom of the locking block 42 retracts into the locking groove 121 through the lock hole 122. At this time, the rotating beam assembly 3 is unlocked, and the rebound force of the second spring 53 pops out the spring block 54, causing the spring block 54 to push out the rotating beam assembly 3 and rotate clockwise in the horizontal direction, thus unlocking the rotating beam assembly 3 and taking out the closed bend workpiece.

[0063] By adjusting the depth of the adjustable screw 55 within the hollow cylinder 52, the compression force of the second spring 53 can be adjusted. This allows control over the ejection force of the spring block 54 when the rotating beam assembly 3 is ejected, thereby controlling the speed at which the rotating beam assembly 3 rotates clockwise in the horizontal direction to disengage from the positioning stop 51. This method is applicable to workpieces of different weights, ensuring that the bent and closed workpiece maintains a stable posture on the rotating beam assembly 3. It prevents the workpiece from shaking or vibrating on the rotating beam assembly 3 due to excessive ejection speed, which could cause wear between the rotating beam assembly 3 and the workpiece. This effectively improves the stability and safety of the mold when removing parts.

[0064] By providing a flange 56 on the side of the hollow cylinder 52 near the positioning block 51, and having the inner top side of the spring block 54 abutting against the flange 56, the flange 56 can effectively limit the length of the spring block 54 when it is ejected by the second spring 53, thus preventing the spring block 54 from being ejected outside the hollow cylinder 52 due to excessive rebound force of the second spring 53.

[0065] A second aspect of the present invention also discloses a method of using a mold for bending a closed structure, comprising the following steps:

[0066] S1. Rotate the rotating beam assembly 3 counterclockwise in the horizontal direction to lock the rotating beam assembly 3 between the locking assembly 4 and the positioning and retracting assembly 5.

[0067] S2. The bending machine drives the mold to perform bending operations on the workpiece. The mold blade 6 presses the workpiece into the processing groove 21 of the lower mold body 2 for bending. After bending the workpiece multiple times, the workpiece is formed into a closed state.

[0068] S3. After the processed part is bent to form a closed shape, the processed part is wrapped around the rotating beam assembly 3 from the hollow part of the upper mold body 1.

[0069] S4. Unlock the locking assembly 4, and the positioning and retraction assembly 5 will push the rotating beam assembly 3 out in a clockwise horizontal direction to remove the workpiece.

[0070] Specifically, by using the mold with this closed bending structure, sheet metal parts can be bent multiple times quickly and achieve closed bending. Compared with the bending molds or bending methods of traditional parts, it can effectively avoid the interference of the parts being difficult to remove from the mold or being unable to be bent in a closed manner after closed bending. At the same time, it improves the bending accuracy and efficiency of the parts and meets the process requirements of closed bending of sheet metal parts.

[0071] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mold for bending a closed structure, disposed at the bottom of a bending machine, characterized in that, include: Upper mold body (1) and lower mold body (2); The upper mold body (1) is hollowed out in the middle, dividing the upper mold body (1) into a left mold body (11) and a right mold body (12), and the height of the left mold body (11) is greater than the height of the right mold body (12); The left mold body (11) has a groove (111) near the bottom, and a rotating beam assembly (3) is rotatably arranged in the groove (111). A locking groove (121) is provided on one side of the right mold body (12), and a locking component (4) is provided in the locking groove (121). A locking hole (122) is provided at the bottom of the right mold body (12), and the locking hole (122) is connected to the locking groove (121). The right mold body (12) is provided with a positioning and retraction assembly (5) on the other side. The rotating beam assembly (3) is locked between the locking assembly (4) and the positioning and retraction assembly (5) in the locked state. The bottom of the rotating beam assembly (3) is provided with a mold cutter body (6); The lower mold body (2) has a processing groove (21) for bending the workpiece along the length of the lower mold body (2) in the middle, and the mold cutter body (6) is located in the processing groove (21); The locking assembly (4) includes a cover plate (41), a locking block (42) is provided on the inner side of the cover plate (41), a first spring (43) is provided on the top of the locking block (42), a protrusion (44) extends from one side of the locking block (42), a locking shaft (45) is provided at the bottom of the protrusion (44), and a rotating handle (46) is provided on the outer side of the cover plate (41), the rotating handle (46) is connected to the locking shaft (45); The bottom of the lock block (42) is provided with a slope (421), and the bottom of the lock block (42) extends to the outside of the lock hole (122); The positioning and retraction assembly (5) includes a positioning block (51), and a hollow cylinder (52) is provided on one side of the positioning block (51), and the hollow cylinder (52) is connected to the positioning block (51). A second spring (53) is provided inside the hollow cylinder (52). A spring block (54) is provided on one side of the second spring (53), and an adjustable screw (55) is provided on the other side of the second spring (53). The hollow cylinder (52) has a flange (56) on the side near the positioning block (51), the inner top of the spring block (54) abuts against the flange (56), and the bottom of the spring block (54) extends to the outside of the positioning block (51).

2. The mold for the bending closed structure according to claim 1, characterized in that, Bearings (112) are provided on both sides of the groove (111), and a rotating shaft (31) is provided through one end of the rotating beam assembly (3). The two ends of the rotating shaft (31) are respectively provided in the bearings (112).

3. The mold for the bending closed structure according to claim 2, characterized in that, A boss (32) is provided along the bottom length of the rotating beam assembly (3), and an installation groove (61) is provided along the top length of the mold cutter body (6). The rotating beam assembly (3) is connected to the installation groove (61) of the mold cutter body (6) through the boss (32).

4. The mold for the bending closed structure according to claim 3, characterized in that, The top of the rotating beam assembly (3) is uniformly provided with a number of countersunk holes (33), and the top of the mold cutter body (6) is provided with a number of threaded holes corresponding to the number of countersunk holes (33).

5. A method of using a mold for a bending closed structure as described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Rotate the rotating beam assembly (3) counterclockwise in the horizontal direction to lock the rotating beam assembly (3) between the locking assembly (4) and the positioning and retracting assembly (5); S2. The bending machine drives the mold to perform bending operation on the workpiece. The mold blade (6) presses the workpiece into the processing groove (21) of the lower mold body (2) for bending. After bending the workpiece multiple times, the workpiece forms a closed state. S3. After the workpiece is bent to form a closed shape, the workpiece is wrapped around the rotating beam assembly (3) from the hollow part of the upper mold body (1); S4. Unlock the locking assembly (4), and the positioning and retraction assembly (5) pushes the rotating beam assembly (3) out in a clockwise horizontal direction to remove the workpiece.

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