Numerical control bidirectional bending machine

Abstract

The invention belongs to the technical field of bending machines, and relates to a numerical control bidirectional bending machine. The bidirectional bending device comprises a fixing table, a bidirectional bending mechanism is installed on a fixing frame, and a lower die base is arranged on the portion, below the bidirectional bending mechanism, of the fixing table; sliding plates are arranged on the two sides of the fixing frame in a sliding mode, sliding blocks are connected to the sliding plates in an up-down sliding mode, the sliding blocks are connected with guide columns, and the guide columns are arranged in limiting grooves formed in the fixing frame in a sliding mode; a shell is fixedly connected between the two sliding blocks, and a winding assembly used for winding the protective film is arranged in the shell. In the conveying process of the plate, the shell is pushed to move, the shell pulls the protective film, the protective film is flatly laid on the lower die base, and therefore the plate is separated from the lower die base, and scratches and abrasion generated in the moving process of the plate relative to the lower die base are prevented. When the plate moves to the lower die base, the shell automatically resets and pulls the protective film to cover the upper end face of the plate, scratching during bending is avoided, and the surface quality and the qualified rate of products can be improved easily.

Description

Technical Field

[0001] This invention belongs to the field of bending technology and relates to a CNC bidirectional bending machine. Background Technology

[0002] In fields such as chassis and cabinet manufacturing, appliance casings, and sheet metal manufacturing, sheet metal bending is a crucial process in metal forming. CNC bending machines, through program-controlled relative movement of the upper and lower dies, can complete complex shape bending operations with high precision and efficiency, and have become one of the essential pieces of equipment in modern manufacturing.

[0003] During the process of feeding the sheet metal into the bending machine's worktable and sliding it to the lower die holder for positioning, relative sliding friction occurs between its lower surface and the metal lower die holder. This can easily leave scratches or wear on the bottom of the sheet metal, a problem that is particularly severe for stainless steel, mirror aluminum, and coated or pre-treated sheets. The upper die of the bending mechanism comes into direct contact with the upper surface of the sheet metal under high pressure, causing it to undergo plastic deformation. Even if the die is precisely polished, the enormous contact stress and relative micro-slippage can still leave indentations or scratches on the sheet metal surface, affecting the product's appearance.

[0004] Patent document CN120133386A discloses a punching and bending fixture for thin-walled metal parts, including an upper die mechanism, a lower die mechanism, a conveying mechanism, and a base plate. The conveying mechanism is equipped with an upper protective mechanism. The upper protective mechanism includes a film-laying assembly, a support assembly, and a winding assembly. The film-laying assembly is mounted on the conveying mechanism and has a protective film wound on it. The support assembly is located on one side of the film-laying assembly. This fixture conveys the sheet metal to the lower die mechanism via the conveying mechanism, while simultaneously causing the protective film on the film-laying assembly to fall onto the top of the sheet metal via a movable roller. The protective film then winds along the top of the sheet metal onto the winding assembly, protecting the top of the sheet metal. When the upper die mechanism bends the sheet metal, the protective film on the sheet metal contacts the upper die mechanism instead of the sheet metal itself, thus preventing scratches caused by friction between the upper die mechanism and the top of the sheet metal.

[0005] However, the tooling has the following shortcomings in actual use: the upper and lower protection are two independently operating mechanisms, and the upper and lower protective films are laid independently, requiring independent unwinding, guiding, pressing and driving components, which not only increases the complexity of the equipment structure and manufacturing cost, but also puts forward higher requirements for the timing coordination of the two mechanisms, increasing the risk of failure.

[0006] To address the above problems, this invention proposes a CNC bidirectional bending machine. Summary of the Invention

[0007] To address the problems existing in the background art, the present invention proposes a CNC bidirectional bending machine.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a CNC bidirectional bending machine, comprising a fixed table, a fixed frame fixedly connected to one end of the fixed table, a bidirectional bending mechanism mounted on the fixed frame, and a lower die base provided on the fixed table below the bidirectional bending mechanism; sliding plates are slidably arranged on both sides of the fixed frame, and sliders are vertically slidably connected to the sliding plates, the sliders are connected to guide posts, and the guide posts are slidably arranged in limiting grooves opened on the fixed frame; a housing is fixedly connected between the two sliders, and a winding assembly for winding up the protective film is provided inside the housing;

[0009] The free end of the protective film extends from the bottom of the housing. When the sheet material is conveyed, the housing moves, and the protective film is pulled and covers the lower mold base. When the housing is reset, the protective film is pulled and covers the area of ​​the sheet material to be bent, located between the sheet material and the bidirectional bending mechanism.

[0010] Furthermore, the limiting groove includes a first groove segment, a second groove segment, and a third groove segment connected in sequence; the first groove segment is higher than the second groove segment, and the third groove segment is used to connect the first groove segment and the second groove segment; the guide post slides along the second groove segment, causing the housing to move synchronously with the plate; when the guide post moves to the end of the second groove segment, the slider moves upward, causing the guide post to enter the first groove segment, causing the housing to detach from the plate; when the sliding plate resets, the guide post slides along the first groove segment, and then, when the guide post moves to the end of the first groove segment, the guide post passes through the third groove segment and enters the second groove segment.

[0011] Furthermore, a baffle is rotatably installed in the third groove section, and the guide post pushes the baffle open from the end of the first groove section to enter the second groove section.

[0012] Furthermore, the winding assembly includes a rotating shaft rotatably disposed within the housing, the protective film being wound around the rotating shaft, and a through hole being provided at the bottom of the housing for the free end of the protective film to pass through.

[0013] Furthermore, a third clearance groove is provided at the bottom of the housing, a second cutter is slidably disposed in the third clearance groove, and a second electric push rod is provided in the third clearance groove to drive the second cutter to slide; the second cutter extends to cut the protective film.

[0014] Furthermore, the slide plate has a groove, the slider is slidably disposed in the groove, the bottom of the groove has a second clearance groove, the second clearance groove has a second spring, and the two ends of the second spring are respectively connected to the slider and the bottom of the second clearance groove.

[0015] Furthermore, the fixing frame has a groove for sliding cooperation with the slide plate, a guide rod is fixed in the groove, the slide plate slides through the guide rod, and a first spring is sleeved on the guide rod, with the two ends of the first spring connected to the slide plate and the fixing frame respectively.

[0016] Furthermore, a conveyor frame is installed on the fixed platform, and a conveyor roller that conveys the sheet material to the mold base is rotatably mounted on the conveyor frame.

[0017] Furthermore, the conveyor frame is provided with first electric push rods on both the upper and lower sides near the lower mold base, and the telescopic end of the first electric push rod is equipped with a first cutter for cutting the sheet material.

[0018] Compared with existing technologies, this invention has the following advantages: During the conveying process of the sheet material, the housing is pushed to move, and the housing pulls the protective film, causing the protective film to lay flat on the lower mold base, thereby separating the sheet material from the lower mold base and preventing scratches and wear caused by the sheet material moving relative to the lower mold base. When the sheet material moves onto the lower mold base, the housing automatically resets and pulls the protective film to cover the upper surface of the sheet material, avoiding scratches during bending and improving product surface quality and yield. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention in the first direction;

[0020] Figure 2 This is a schematic diagram of the overall structure of the present invention in the second direction;

[0021] Figure 3 This is a partial structural schematic diagram of the conveyor frame in this invention;

[0022] Figure 4 This is a cross-sectional view of the fixing frame in this invention;

[0023] Figure 5 In this invention Figure 4 Enlarged view of part A;

[0024] Figure 6 This is a schematic diagram of the skateboard structure in this invention;

[0025] Figure 7 This is a schematic diagram of the connection between the slider and the slide plate in this invention;

[0026] Figure 8 This is a schematic diagram of the rotating shaft in this invention;

[0027] Figure 9 This is a cross-sectional view of the shell in this invention;

[0028] Figure 10 In this invention Figure 9 Enlarged view of part B;

[0029] Figure 11 This is a simplified diagram of the shell in its initial state in this invention;

[0030] Figure 12 This is a simplified diagram of the state of the shell when it moves to the left end of the lower mold base in this invention;

[0031] Figure 13 This is a simplified diagram of the state after the shell is separated from the lower mold base in this invention;

[0032] Figure 14 This is a simplified diagram showing the state of the protective film of the present invention when it is applied to the substrate.

[0033] In the diagram: 1. Fixed platform; 2. Conveyor frame; 3. First electric push rod; 4. First cutter; 5. Lower mold base; 6. Fixed frame; 7. Bidirectional bending mechanism; 8. Groove; 9. Conveyor roller; 10. Limiting groove; 101. First groove segment; 102. Second groove segment; 103. Third groove segment; 11. Fixed shaft; 12. Baffle; 13. First clearance groove; 14. Guide rod; 15. First spring; 16. Slide plate; 17. Slide groove; 18. Slider; 19. Guide post; 20. Second clearance groove; 21. Second spring; 22. Housing; 23. Motor; 24. Protective film; 25. Rotating shaft; 26. Through hole; 27. Third clearance groove; 28. Second electric push rod; 29. ​​Second cutter; 30. Sheet metal. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] like Figures 1-14 As shown, the technical solution adopted in this invention is as follows: The CNC bidirectional bending machine includes a fixed table 1. As... Figure 1 As shown, a conveyor frame 2 is fixedly connected to a fixed platform 1. Multiple conveyor rollers 9 are rotatably mounted on the conveyor frame 2 along its length via bearings. These multiple conveyor rollers 9 together form a conveying plane, used to support and guide the plate 30 forward.

[0036] like Figure 1As shown, a fixed frame 6 is fixedly connected to one end of the fixed platform 1, and the fixed frame 6 is located at one end of the conveyor frame 2. A bidirectional bending mechanism 7 is installed on the top of the fixed frame 6, and a lower die base 5 is installed on the fixed platform 1 below the bidirectional bending mechanism 7. The lower die base 5 is configured to cooperate with the bidirectional bending mechanism 7. The bidirectional bending mechanism 7 uses a hydraulic or servo-driven bending actuator known in the art, so that the bending actuator can perform a downward pressing movement relative to the fixed frame 6 and cooperate with the lower die base 5 to complete the bending and forming of the sheet metal 30.

[0037] like Figure 2 , Figure 3 As shown, a first electric push rod 3 is provided on both the upper and lower sides of one end of the conveyor frame 2. A first cutter 4 is installed at the telescopic end of each first electric push rod 3. The cutting edges of the two first cutters 4 are arranged opposite each other. The two first cutters 4 move closer to each other to cut the plate 30.

[0038] A groove 8 is formed on each of the two opposite sides of the fixing frame 6, and a sliding plate 16 is slidably disposed within the groove 8. Figure 6 As shown, to ensure smooth sliding of the slide plate 16, two parallel guide rods 14 are fixedly installed in each groove 8. The slide plate 16 has through holes adapted to the guide rods 14, allowing it to slide smoothly through the holes onto the guide rods 14. A first clearance groove 13 is formed on the inner wall of one end of the groove 8. One end of the guide rod 14 is fixedly connected to the inner wall of the groove 8, and the other end of the guide rod 14 passes through the first clearance groove 13 and is fixedly connected to the end wall of the first clearance groove 13. A first spring 15 is installed in the first clearance groove 13, and the first spring 15 is sleeved on the guide rod 14. One end of the first spring 15 is fixedly connected to the slide plate 16, and the other end is fixedly connected to the end wall of the first clearance groove 13.

[0039] like Figure 7 As shown, a slide groove 17 is provided on the slide plate 16, and a slider 18 is vertically slidably disposed in the slide groove 17. A second clearance groove 20 is provided at the bottom of the slide groove 17. A second spring 21 is disposed in the second clearance groove 20. The lower end of the second spring 21 is connected to the bottom surface of the second clearance groove 20, and the upper end is connected to the bottom surface of the slider 18.

[0040] A limiting groove 10 is formed on the inner wall of the groove 8. A guide post 19 is connected to the slider 18, and the guide post 19 extends into the limiting groove 10 and slides within it. Figure 4 , Figure 5As shown, the limiting groove 10 includes a first groove segment 101, a second groove segment 102, and a third groove segment 103. Both the first groove segment 101 and the second groove segment 102 are horizontally arranged, with the first groove segment 101 higher than the second groove segment 102. One end of the first groove segment 101 and the second groove segment 102 is connected through the third groove segment 103, which is inclined. The ends of the first groove segment 101 and the second groove segment 102 furthest from the third groove segment 103 are connected through a vertical groove. Figure 5 As shown, when the guide post 19 enters the third groove 103 from the first groove 101 and continues to move to the right, it moves downward under the guidance of the third groove 103 and enters the second groove 102.

[0041] A fixed shaft 11 is fixedly installed at the entrance of the third groove section 103. A baffle 12 is rotatably mounted on the fixed shaft 11. A torsion spring is sleeved on the fixed shaft 11, and the torsion spring is fixedly connected between the fixed shaft 11 and the baffle 12. Under the action of the torsion spring, the baffle 12 remains closed in its natural state. A receiving groove is formed on the inner wall of the third groove section 103. The end of the baffle 12 away from the fixed shaft 11 extends into the receiving groove to prevent the baffle 12 from rotating upward, thereby preventing the guide post 19 from entering the first groove section 101 from the right end of the second groove section 102.

[0042] As the guide post 19 moves from the first slot 101 into the third slot 103, it continues to move to the right. Guided by the third slot 103, the guide post 19 moves downward and pushes open the baffle 12 to enter the second slot 102. Simultaneously, the guide post 19 drives the slider 18 downward, compressing the second spring 21. When the guide post 19 moves along the second slot 102 to the end furthest from the third slot 103, under the action of the second spring 21, it moves upward into the first slot 101, causing the slider 18 to move upward.

[0043] A housing 22 is fixedly connected between the two sliders 18, and a winding assembly for winding up the protective film 24 is provided inside the housing 22.

[0044] The free end of the protective film 24 extends from the bottom of the housing 22. When the plate 30 moves onto the lower mold base 5, the plate 30 pushes the housing 22 to move, and the protective film 24 is pulled and covers the lower mold base 5. When the housing 22 returns to its original position, the protective film 24 is pulled and covers the area of ​​the plate 30 to be bent, located between the plate 30 and the bidirectional bending mechanism 7, to protect the area of ​​the plate 30 to be bent.

[0045] The winding assembly includes a rotating shaft 25, which is rotatably disposed within a housing 22. A motor 23 for driving the rotating shaft 25 is fixedly mounted on one of the sliders 18. A through hole 26 is provided at the bottom of the housing 22, through which the free end of the protective film 24 extends downward.

[0046] like Figure 9 , Figure 10 As shown, in order to achieve automatic cutting of the protective film 24, a third clearance groove 27 is provided at the bottom of the housing 22. A second cutter 29 is slidably disposed in the third clearance groove 27, and a second electric push rod 28 is installed in the third clearance groove 27. The second cutter 29 is fixedly connected to the telescopic end of the second electric push rod 28. The cutting edge of the second cutter 29 faces the through hole 26. When the second electric push rod 28 pushes the second cutter 29 to extend, the second cutter 29 cuts the protective film 24.

[0047] Working principle:

[0048] In the initial state, such as Figure 4 As shown, the slide plate 16 is initially positioned on the right side of the groove 8 under the action of the first spring 15. At this time, the guide post 19 is located at the rightmost end of the second groove segment 102 of the limiting groove 10, and the second spring 21 is in a compressed state. Figure 11 As shown, the free end of the protective film 24 hangs down from the bottom of the housing 22.

[0049] The sheet material 30 is conveyed to the lower mold base 5 via the conveying roller 9, i.e., conveyed to the left. As the sheet material 30 moves to the left, its left end contacts and pushes the housing 22 to move to the left. The housing 22 drives the sliders 18 and the sliding plate 16 on both sides to overcome the tension of the first spring 15 and slide horizontally to the left along the groove 8. During this process, the guide post 19 slides horizontally from right to left within the second groove section 102.

[0050] As the housing 22 moves to the left, it pulls the drooping protective film 24, causing it to gradually lie flat on the lower mold base 5. Then, when the sheet metal 30 moves onto the lower mold base 5, it contacts the protective film 24, protecting the sheet metal 30. This effectively prevents scratches and wear caused by the sheet metal 30 sliding relative to the lower mold base 5, and is particularly beneficial for protecting the surface of high-gloss or coated sheet metal 30.

[0051] like Figure 12 As shown, when the plate 30 reaches the preset bending area, the plate 30 is stopped from being conveyed. At this time, the slide plate 16 moves to the leftmost end of the groove 8, and the guide post 19 reaches the left end of the second groove section 102. Under the action of the second spring 21, the slider 18 moves upward, and the slider 18 drives the guide post 19 to move upward, so that the guide post 19 enters the first groove section 101 from the second groove section 102.

[0052] When slider 18 moves upward, it causes housing 22 to move upward, thereby causing housing 22 to disengage from the upper surface of plate 30, such as... Figure 13 As shown.

[0053] After the housing 22 separates from the plate 30, the leftward pushing force on the sliding plate 16 disappears. The restoring force of the first spring 15 drives the sliding plate 16 to return to its rightward sliding position. At this time, since the guide post 19 is located within the first groove section 101, the guide post 19 slides to the right along the first groove section 101. The guide post 19 drives the housing 22 to move to the right via the slider 18. The housing 22 then pulls the protective film 24 laid under the plate 30 upward as a whole, causing it to flip over the edge of the plate 30, and finally the protective film 24 covers the upper surface of the area of ​​the plate 30 to be bent. Before the downward pressing operation of the bidirectional bending mechanism 7, a reliable isolation layer is formed on the upper surface of the plate 30, such as... Figure 14 As shown.

[0054] When the guide post 19 moves from the first groove 101 to the right into the third groove 103, it moves downward under the guidance of the third groove 103 and pushes open the baffle 12. Then it slides into the second groove 102 via the third groove 103 and finally returns to the initial position at the rightmost end of the second groove 102.

[0055] Next, the bidirectional bending mechanism 7 is activated for bending. The protective film 24 isolates the bidirectional bending mechanism 7 from direct contact with the surface of the sheet 30. This prevents scratches during bending and helps improve product surface quality and yield.

[0056] After bending is completed, the upper and lower first electric push rods 3 move synchronously, driving the first cutter 4 to cut the sheet 30. Subsequently, the second electric push rod 28 moves, driving the second cutter 29 to cut the protective film 24.

[0057] Start the motor 23 to release a new section of protective film 24 for the next operation.

[0058] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 CNC bidirectional bending machine, characterized in that: The system includes a fixed platform (1), one end of which is fixedly connected to a fixed frame (6), a bidirectional bending mechanism (7) is installed on the fixed frame (6), and a lower mold base (5) is provided on the fixed platform (1) below the bidirectional bending mechanism (7); both sides of the fixed frame (6) are slidably provided with sliding plates (16), and sliding blocks (18) are vertically slidably connected on the sliding plates (16), and the sliding blocks (18) are connected to guide posts (19), which are slidably provided in the limiting grooves (10) opened on the fixed frame (6); a housing (22) is fixedly connected between the two sliding blocks (18), and a winding assembly for winding up the protective film (24) is provided inside the housing (22); The free end of the protective film (24) extends from the bottom of the housing (22). When the plate (30) is conveyed, the housing (22) moves, and the protective film (24) is pulled and covers the lower mold base (5). When the housing (22) is reset, the protective film (24) is pulled and covers the bending area of ​​the plate (30), located between the plate (30) and the bidirectional bending mechanism (7).

2. The CNC bidirectional bending machine according to claim 1, characterized in that: The limiting groove (10) includes a first groove segment (101), a second groove segment (102), and a third groove segment (103) connected in sequence; the first groove segment (101) is higher than the second groove segment (102), and the third groove segment (103) is used to connect the first groove segment (101) and the second groove segment (102); the guide post (19) slides along the second groove segment (102) so that the housing (22) moves synchronously with the plate (30), and the guide post (19) moves. When the slider (18) reaches the end of the second groove (102), it moves upward so that the guide post (19) enters the first groove (101), causing the housing (22) to separate from the plate (30); when the slide plate (16) is reset, the guide post (19) slides along the first groove (101), and then, when the guide post (19) moves to the end of the first groove (101), the guide post (19) passes through the third groove (103) and enters the second groove (102).

3. The CNC bidirectional bending machine according to claim 2, characterized in that: A baffle (12) is rotatably installed in the third groove (103), and the guide post (19) pushes the baffle (12) from the end of the first groove (101) and enters the second groove (102).

4. The CNC bidirectional bending machine according to claim 1, characterized in that: The winding assembly includes a rotating shaft (25) rotatably disposed within the housing (22), the protective film (24) is wound around the rotating shaft (25), and the bottom of the housing (22) has a through hole (26) through which the free end of the protective film (24) passes.

5. The CNC bidirectional bending machine according to claim 4, characterized in that: The bottom of the housing (22) is provided with a third clearance groove (27), a second cutter (29) is slidably disposed in the third clearance groove (27), and a second electric push rod (28) is provided in the third clearance groove (27) to drive the second cutter (29) to slide; the second cutter (29) extends out to cut the protective film (24).

6. The CNC bidirectional bending machine according to claim 1, characterized in that: The slide plate (16) has a groove (17) and the slider (18) is slidably disposed in the groove (17). The bottom of the groove (17) is provided with a second clearance groove (20) and a second spring (21) is provided in the second clearance groove (20). The two ends of the second spring (21) are respectively connected to the bottom of the slider (18) and the second clearance groove (20).

7. The CNC bidirectional bending machine according to claim 1, characterized in that: The fixing frame (6) has a groove (8) that slides with the slide plate (16). A guide rod (14) is fixed in the groove (8). The slide plate (16) slides through the guide rod (14). A first spring (15) is sleeved on the guide rod (14). The two ends of the first spring (15) are respectively connected to the slide plate (16) and the fixing frame (6).

8. The CNC bidirectional bending machine according to claim 1, characterized in that: A conveyor frame (2) is installed on the fixed platform (1), and a conveyor roller (9) is rotatably installed on the conveyor frame (2) to convey the plate (30) to the mold base (5).

9. The CNC bidirectional bending machine according to claim 8, characterized in that: The conveyor frame (2) is provided with first electric push rods (3) on both the upper and lower sides near the lower mold base (5). The telescopic end of the first electric push rod (3) is equipped with a first cutter (4) for cutting the plate (30).

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