Bending device for machining

Abstract

The utility model relates to a bending device for machining. The bending device for machining comprises a base, a supporting frame, an upper die base, a lower die base, a hydraulic cylinder, a male die, a female die and a matched rapid assembling and locking structure. The upper die base is driven by the hydraulic cylinder to drive the male die to bend a workpiece placed on the female die, the male die is provided with a fixing plate, a clamping block and a locking groove and is matched with a clamping groove and a locking mechanism on the upper die base to achieve rapid installation and detachment of the male die, the lower portion of the female die is provided with a clamping plate, and the clamping plate is matched with a positioning groove in the lower die base to complete rapid positioning. The bending die is simple in structure, high in die replacement efficiency, accurate in positioning, convenient and fast to operate and suitable for efficient bending machining of workpieces of multiple specifications.

Description

TECHNICAL FIELD

[0001] The utility model belongs to bending equipment technical field, concretely relates to a bending device for machining. BACKGROUND

[0002] In the forming process of metal components, bending process as a common plastic processing method is widely used in the forming manufacturing of various metal plate components. The traditional bending processing equipment usually adopts the cooperation of upper die and lower die, and the workpiece is pressed by the upper die to make it plastically deform on the basis of the support of the lower die, and the bending shape with the required angle is formed. In order to adapt to the processing needs of different product structures and sizes, the bending die often needs to be replaced according to different workpieces.

[0003] However, the existing bending device has the problems of complicated operation and low efficiency in the process of die installation and replacement. Especially when replacing the upper die (male die) or the lower die (female die), tools are usually needed for bolt fixing or dismounting, which not only consumes time and effort, but also may cause operator fatigue and affect production rhythm when the die is frequently replaced. In addition, due to the unreasonable design of the positioning and locking structure of the die, the die position may deviate or be not firmly installed during long-term use, affecting the bending precision and processing quality. SUMMARY

[0004] In view of the problems existing in the prior art, the purpose of the utility model is to provide a bending device for machining, which can realize simple structure, convenient installation and dismounting, and can ensure firm die positioning and high processing efficiency.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A bending device for machining, comprising a base, an upper end of the base is provided with a workbench and a support frame of inverted U shape fixed on the workbench, an inner side of the support frame is provided with a male die and a female die for bending and forming workpieces, and an inner side of the support frame is further provided with an upper die seat and a lower die seat for installing the male die and the female die, the lower die seat is fixed on the workbench, and an upper end of the support frame is fixed with a hydraulic cylinder for driving the upper die seat to move up and down;

[0007] The upper end of the male die is hung on the upper die seat, and a locking mechanism is installed on the upper die seat for locking and fixing the position of the hung male die;

[0008] The lower end of the female die is positioned and inserted into the lower die seat, a pressing block is installed on the lower die seat, and the pressing block can press and release the female die by rotating.

[0009] Furthermore, a clamping plate is fixed at the lower end of the die, and a positioning groove is provided on the upper surface of the lower die base for positioning and inserting the clamping plate. One end of the pressure block is pressed against the edge of the clamping plate.

[0010] Furthermore, a fixing plate is fixed to the upper end of the punch, a T-shaped locking block is fixed to the upper side of the fixing plate, and a locking groove is provided on the front side of the fixing plate.

[0011] Furthermore, the locking block and the fixing plate are positioned and engaged by pins, and the locking block is fixed to the fixing plate by fixing screws.

[0012] Furthermore, the lower surface of the upper mold base is provided with a mounting groove for mounting the card block, and the upper surface of the upper mold base is provided with a positioning hole. The lower end of the push rod of the hydraulic cylinder is fixed with a connecting plate, and the lower side of the connecting plate is fixed with a plug inserted into the positioning hole.

[0013] Furthermore, the locking mechanism includes a guide seat fixed to the lower surface of the upper mold base and a baffle fixed to the front side of the upper mold base. A locking block inserted into the locking groove is installed inside the guide seat. A pull rod fixedly connected to the locking block is inserted through the baffle. A spring is fitted on the part of the pull rod located between the locking block and the pull rod.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This bending device for machining uses an upper and lower die base inside a support frame. A hydraulic cylinder drives the upper die base to move the punch up and down, enabling efficient bending of the workpiece on the die. The punch and die structures adopt a modular and detachable design, along with a quick assembly and locking structure. This eliminates the need for traditional bolt fixing during die replacement, significantly improving die replacement efficiency, reducing manual labor intensity, and increasing the equipment's operating cycle time. It is suitable for flexible processing scenarios involving multiple batches and small quantities.

[0016] The device features a fixed plate, a T-shaped locking block, and a locking groove in the punch section. The locking block engages with the mounting groove on the upper die base to achieve quick mounting and positioning. The upper die base is equipped with a locking mechanism, which, through a guide seat, locking block, spring, and pull rod structure, enables automatic locking and manual unlocking of the punch. This structure not only ensures the stability of the punch after installation but also allows for disassembly and replacement without tools. It solves the problems of cumbersome punch replacement steps and difficulty in repositioning the traditional punch, thereby effectively improving bending accuracy and safety.

[0017] The device uses a clamping plate in the die section to cooperate with the positioning groove on the lower die base to achieve insertion positioning. At the same time, a rotatable pressure block is set to press and fix the edge of the clamping plate. When the die needs to be replaced, simply rotate the pressure block to release it from the pressing state, which can achieve quick disassembly of the die. This structure eliminates the traditional bolt fixing method, significantly reduces the die replacement time, and ensures the reliability and repeatability of the installation process, thereby improving the overall production efficiency of the equipment and the flexibility of die replacement.

[0018] The overall structure is reasonably designed, and all functional components are made of high-strength materials. Combined with positioning holes, plugs, guide grooves and other supporting structures, the stability and accuracy of the mold under high-speed movement are guaranteed, which significantly improves the consistency and quality of bending processing. At the same time, it also improves the adaptability and economy of the equipment in complex processing tasks. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the mating structure between the concave mold and the lower mold base of this utility model;

[0021] Figure 3 This is a schematic diagram of the punch of this utility model;

[0022] Figure 4 This is a schematic diagram of the upper mold base of this utility model;

[0023] Figure 5 This is a schematic diagram of the locking mechanism of this utility model.

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1. Base; 2. Workbench; 3. Support frame; 4. Upper mold base; 41. Mounting slot; 42. Positioning hole; 5. Hydraulic cylinder; 51. Connecting plate; 52. Plug; 6. Locking mechanism; 61. Guide seat; 62. Locking block; 63. Spring; 64. Baffle; 65. Pull rod; 7. Punch; 71. Fixing plate; 72. Clamping block; 73. Fixing screw; 74. Pin; 75. Locking groove; 8. Die; 81. Clamping plate; 9. Lower mold base; 91. Positioning groove; 10. Pressure block. Detailed Implementation

[0026] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model. Example

[0027] likeFigure 1 As shown, a bending device for machining includes a base 1, a worktable 2 and an inverted U-shaped support frame 3 fixed on the worktable 2 at the upper end of the base 1; the support frame 3 is made of Q235 carbon structural steel, with a stable overall structure and high strength, suitable for withstanding repeated impact loads during machining; the inner side of the support frame 3 is provided with a punch 7 and a die 8 for bending and forming the workpiece, the punch 7 and the die 8 are standardized mold parts, the punch 7 is made of high-strength Cr12MoV mold steel, and the die 8 is made of SKD11 cold work mold steel, which has high wear resistance and compressive strength; the inner side of the support frame 3 is also provided with a support for the punch 7 and the die 8. Mold 8 is equipped with an upper mold base 4 and a lower mold base 9. Both upper mold base 4 and lower mold base 9 are integral casting structures, and their surfaces are CNC machined to ensure installation accuracy. The lower mold base 9 is fixed on the worktable 2 and is doubly fixed by bolts and positioning pins to avoid displacement errors during processing. The upper end of the support frame 3 is fixed with a hydraulic cylinder 5 that drives the upper mold base 4 to move up and down. The hydraulic cylinder 5 is a double-acting hydraulic cylinder of model HSG80 / 50-400, which has strong driving force and stability. Its cylinder body is connected to the support frame 3 by high-strength bolts. The push rod and the upper mold base 4 are connected by a connecting plate to achieve transmission, ensuring that the mold moves up and down synchronously and completes the efficient bending processing of the workpiece.

[0028] The upper end of the punch 7 is mounted on the upper die base 4. The upper die base 4 is equipped with a locking mechanism 6 that locks and fixes the position of the punch 7 after it is mounted. This structure effectively solves the problem of low efficiency caused by the reliance on bolt connections in traditional punch installation. The upper die base 4 is an integrated design with a slot at the bottom for quick installation of the punch 7. The locking mechanism 6 works with the locking mechanism 6 to complete the positioning and locking function. The locking mechanism 6 consists of a guide seat, a locking block, a pull rod, a spring, and a baffle. The locking block is located inside the guide seat and is continuously pressed downward by the spring force to ensure that the punch 7 is stable and does not wobble. The entire mechanism is made of 45# steel and the surface is treated with black oxide to enhance corrosion resistance. The upper die base 4 is driven by a hydraulic cylinder 5 to achieve up and down stroke control, which works with the die 8 to complete the precise bending action.

[0029] The lower end of the die 8 is positioned and inserted into the lower die base 9, and a pressure block 10 is installed on the lower die base 9. The pressure block 10 clamps and releases the die 8 by rotating. The pressure block 10 is made of GCr15 bearing steel, which has high hardness and wear resistance. Its rotation angle is controlled by a side handle to achieve rapid clamping and release of the die 8, improving the efficiency of die replacement. This structure solves the problem of cumbersome die replacement in traditional methods, avoids the impact of long bolt disassembly and assembly time on processing efficiency, and enhances the practicality and flexibility of the device.

[0030] like Figure 2As shown, a clamping plate 81 is fixed to the lower end of the die 8, and a positioning groove 91 is provided on the upper surface of the lower die base 9 for positioning and inserting the clamping plate 81. One end of the pressure block 10 is pressed against the edge of the clamping plate 81. The clamping plate 81 is made of Q345B high-strength steel plate and is connected to the bottom of the die 8 by welding. The depth of the positioning groove 91 is set to 10mm to ensure the perpendicularity and parallelism of the die on the lower die base 9. The pressure block 10 is connected to the lower die base 9 through a central shaft, and a limit retaining ring is provided at the shaft end to prevent offset or slippage during rotation. The overall design helps to quickly achieve stable installation and disassembly of the die.

[0031] like Figure 3 As shown, a fixing plate 71 is fixed to the upper end of the punch 7, and a T-shaped locking block 72 is fixed to the upper side of the fixing plate 71. A locking groove 75 is provided on the front side of the fixing plate 71. The fixing plate 71 is made of 40Cr tempered steel and the surface is treated with high frequency quenching to improve fatigue resistance. It is connected to the punch 7 by four M8 high-strength bolts. The locking block 72 adopts a T-shaped structure and has a self-locking function after insertion. It is connected to the fixing plate 71 by a Φ6mm positioning pin 74 to achieve angle and position limit. The locking block 72 is made of Cr12 steel and is connected to the fixing plate 71 by fixing screws 73. The fixing screws 73 are M6×12 and are fastened with internal hexagonal screws for easy operation. The locking groove 75 is a rectangular groove structure, and its size matches the locking block 62, which can ensure the stability and repeatability of the punch during use.

[0032] like Figure 4 As shown, the lower surface of the upper mold base 4 is provided with a mounting groove 41 for mounting the locking block 72, and the upper surface of the upper mold base 4 is provided with a positioning hole 42. The lower end of the push rod of the hydraulic cylinder 5 is fixed with a connecting plate 51, and the lower side of the connecting plate 51 is fixed with a plug 52 inserted into the positioning hole 42. The mounting groove 41 is a T-shaped through groove structure, which, together with the T-shaped locking block 72, enables the quick assembly of the punch by insertion and removal. The mounting groove 41 is machined as a whole by CNC to ensure the form and position tolerance requirements. The positioning hole 42 is used to cooperate with the plug 52. The plug 52 is a cylindrical pin structure, made of stainless steel 304, with a tolerance grade of H7 / p6, to ensure that the upper mold base 4 is subjected to uniform force and pressed down synchronously when the hydraulic cylinder is activated, thereby enhancing the stability and accuracy of the mold action.

[0033] like Figure 5As shown, the locking mechanism 6 includes a guide seat 61 fixed to the lower surface of the upper mold base 4 and a baffle 64 fixed to the front side of the upper mold base 4. A locking block 62 is installed inside the guide seat 61 and inserted into the locking groove 75. A pull rod 65 fixedly connected to the locking block 62 is inserted through the baffle 64. A spring 63 is fitted on the part of the pull rod 65 between the locking block 62 and the pull rod 65. The guide seat 61 is made of precision machined integral aluminum alloy 6061 material, which has the advantages of being lightweight and high-strength. The locking block 62 is made of alloy steel material and heat-treated to HRC58 hardness to ensure locking strength. The pull rod 65 is made of Φ8mm stainless steel bar, one end of which is threaded to the locking block 62, and the other end extends out of the baffle 64 for manual operation. The spring 63 is a compression spring made of 65Mn spring steel. Under normal conditions, it keeps the locking block 62 in the locking groove 75. When changing the punch, the pull rod 65 is pulled to overcome the spring force and release the lock, realizing a quick change operation.

[0034] Example 2: Application of the overall structure of a bending device based on a modular design

[0035] The bending device for machining described in this embodiment has a worktable on the base. The worktable is made of HT300 cast iron and undergoes artificial aging treatment to eliminate internal stress. The support frame is made of Q235 carbon steel plate welded into an inverted U-shaped structure. After welding, it is processed as a whole to ensure dimensional accuracy and rigidity. The support frame is equipped with a hydraulic cylinder of model HSG80 / 50-400 to drive the upper mold base. The upper mold base and the lower mold base are respectively made of QT600 ductile iron and the surface is chrome-plated to prevent corrosion and improve wear resistance.

[0036] In actual use, after the hydraulic cylinder is energized, its piston rod extends downward, driving the upper die seat to descend. The punch then presses against the die, performing a 90° bend on the steel plate located between the dies. The bent part is a 2mm thick 304 stainless steel plate, and the processing accuracy is controlled within ±0.3mm.

[0037] Comparative Case: Traditional equipment uses a frame structure welded from independent support columns, which lacks rigidity and is prone to frame deformation when the mold is pressed down, resulting in significant deviations in bending angles. Furthermore, the inconsistent mold installation and power system lead to a loose structure, which is detrimental to high-intensity continuous processing. In contrast, this embodiment, through integrated design and a unified drive system, effectively improves overall stability and bending accuracy.

[0038] Example 3: Application Structure of Quick-Mount and Locking Mechanism for Punch

[0039] In this embodiment, a fixing plate is provided at the upper end of the punch. The fixing plate is made of 40Cr steel, with dimensions of 80×60×15mm and a surface hardness of HRC45 or higher after tempering. The upper side of the fixing plate is fixed to a T-shaped block by two M6×14 socket head cap screws. The block is made of Cr12MoV, with a length of 70mm, a width of 20mm, and a height of 15mm. It is precisely aligned with the fixing plate by a positioning pin. A locking groove with a width of 6mm and a depth of 4mm is provided on the front side of the fixing plate.

[0040] The lower surface of the upper die holder is provided with a T-shaped mounting groove for sliding engagement with the locking block to complete the insertion of the punch; the front side is provided with a locking mechanism, including a Q235 steel guide seat, a spring 63 (free length 30mm, elastic force 4.5N), a locking block 62 (surface nitrided HRC60) and a Φ8 stainless steel pull rod. The pull rod is led out through a baffle for easy manual pulling to lock / unlock.

[0041] Comparative Case: In contrast to traditional equipment where the punch needs to be fixed with multiple screws and the mold replacement time is more than 10 minutes, requiring the use of tools such as wrenches and bolts, this embodiment achieves tool-free mold replacement, and can complete disassembly and assembly within 1 minute, greatly improving the production rhythm, reducing the burden of manual operation, and is suitable for flexible manufacturing scenarios with multiple varieties.

[0042] Example 4: Optimized design of the positioning and clamping structure of the concave mold plate.

[0043] In this embodiment, a rectangular card plate 81 made of Q345B material with dimensions of 100×50×10mm is fixed to the lower end of the die 8 by welding. The upper surface of the lower die base 9 is machined with a positioning groove 91 corresponding to the card plate. The groove is 52mm wide and 12mm deep to ensure that the card plate fits tightly with the lower die base when inserted, and the position repeatability accuracy reaches ±0.05mm. A pressure block 10 is provided on one side of the lower die base. Its structure is a rotary pressure arm, which is made of GCr15 material through precision grinding and has a thickness of 12mm. It is hinged to the support ear seat through a central bearing. A nylon gasket is added to the end of the pressure block to reduce wear caused by direct hard contact.

[0044] When the die needs to be replaced, simply rotate the pressure block outward by 15°, and the clamping plate will disengage from the clamping state, allowing the entire die to be lifted directly. When the pressure block is reset, it automatically clamps the edge of the clamping plate, providing a self-locking function to ensure that the die does not slip during the processing.

[0045] Comparative Case: In contrast to the traditional device where the die is locked with four M10 screws, each replacement requires a significant amount of time and carries the risk of installation deviation; this embodiment implements a combination of insert and rotary clamping, allowing the die to be replaced within one minute, making it convenient, stable, and reliable.

[0046] Example 5: Hydraulic system and positioning transmission structure work together to improve machining stability

[0047] In this embodiment, the hydraulic cylinder is model HSG80 / 50-400. Its cylinder body is made of precision cold-drawn seamless steel pipe, and the inner hole is chrome-plated to reduce the coefficient of friction. The piston rod has a diameter of 50mm and is connected to the upper mold base by an integrated connecting plate 51. The connecting plate is made of 45# steel, with a length of 120mm, a width of 60mm, and a thickness of 12mm. A stainless steel plug 52 is fixed below the connecting plate and is inserted into the positioning hole 42 (hole diameter Φ12, depth 20mm) on the upper mold base for limiting and guiding, ensuring that the upper mold base does not wobble when pressed down.

[0048] The hydraulic cylinder is controlled by an electromagnetic directional valve, the system pressure is set to 6MPa, and the processing speed can reach 120 times / hour; combined with the high-precision structural design of the upper mold base and positioning mechanism, the overall equipment operates stably, with low noise and a repeat bending accuracy better than ±0.2mm.

[0049] Comparative Case: In traditional equipment, the hydraulic cylinder and the upper mold are connected by a floating connection, which lacks a positioning structure. During high-speed operation, the mold is prone to slight swaying, resulting in large fluctuations in the bending angle error of the product. This embodiment, through the plug-positioning hole guide system, greatly improves the vertical stability of the mold stroke and increases the consistency and pass rate of finished products.

[0050] The working principle of this utility model is as follows: When bending the workpiece, the punch 7 is hung in the mounting groove 41 on the upper die base 4 using the clamping block 72. At this time, the locking block 62 is elastically tightened by the spring 63 so that it is locked in the locking groove 75, thereby completing the locking and fixing of the fixing plate 71, thus completing the quick installation of the punch 7. Then, the die 8 is clamped in the positioning groove 91 by the clamping plate 81. Then, the pressure block 10 is rotated so that one end presses against the edge of the clamping plate 81, thereby completing the quick installation and fixing of the die 8. The workpiece is placed on the die 8. At this time, the hydraulic cylinder 5 drives the upper die base 4 to drive the punch 7 to descend and cooperate with the die 8 to perform bending processing on the workpiece.

[0051] When changing the bending die model, rotate the pressure block 10 to move it away from the clamping plate 81. At this time, the die 8 can be disassembled and replaced. At the same time, pull the pull rod 65 to make the locking block 62 disengage from the locking groove 75. Then the punch 7 can be removed from the upper die base 4, so that the punch 7 can be replaced, thereby completing the quick replacement of the punch 7 and the die 8.

[0052] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A bending device for machining, comprising a base (1), characterized in that: The upper end of the base (1) is provided with a workbench (2) and an inverted U-shaped support frame (3) fixed on the workbench (2). The inner side of the support frame (3) is provided with a punch (7) and a die (8) for bending and forming the workpiece. The inner side of the support frame (3) is also provided with an upper die seat (4) and a lower die seat (9) for mounting the punch (7) and the die (8). The lower die seat (9) is fixed on the workbench (2). The upper end of the support frame (3) is fixed with a hydraulic cylinder (5) for driving the upper die seat (4) to move up and down. The upper end of the punch (7) is mounted on the upper die base (4), and the upper die base (4) is equipped with a locking mechanism (6) for locking and fixing the position of the punch (7) after it is mounted. The lower end of the die (8) is positioned and inserted on the lower die base (9), and a pressure block (10) is installed on the lower die base (9). The pressure block (10) presses and releases the die (8) by rotating.

2. The bending device for machining according to claim 1, characterized in that: The lower end of the die (8) is fixed with a clamping plate (81), and the upper surface of the lower die base (9) is provided with a positioning groove (91) for positioning and inserting the clamping plate (81). One end of the pressure block (10) is pressed against the edge of the clamping plate (81).

3. The bending device for machining according to claim 1, characterized in that: The upper end of the punch (7) is fixed with a fixing plate (71), and a T-shaped card block (72) is fixed on the upper side of the fixing plate (71). A locking groove (75) is provided on the front side of the fixing plate (71).

4. A bending device for machining according to claim 3, characterized in that: The locking block (72) and the fixing plate (71) are positioned and engaged by a pin (74), and the locking block (72) is fixed on the fixing plate (71) by a fixing screw (73).

5. A bending device for machining according to claim 3, characterized in that: The lower surface of the upper mold base (4) is provided with a mounting groove (41) for mounting the card block (72), and the upper surface of the upper mold base (4) is provided with a positioning hole (42). The lower end of the push rod of the hydraulic cylinder (5) is fixed with a connecting plate (51), and the lower side of the connecting plate (51) is fixed with a plug (52) inserted into the positioning hole (42).

6. A bending device for machining according to claim 3, characterized in that: The locking mechanism (6) includes a guide seat (61) fixed on the lower surface of the upper mold base (4) and a baffle (64) fixed on the front side of the upper mold base (4). A locking block (62) inserted into the locking groove (75) is installed on the inner side of the guide seat (61). A pull rod (65) fixedly connected to the locking block (62) is inserted through the baffle (64). A spring (63) is fitted on the part of the pull rod (65) located between the locking block (62) and the pull rod (65).

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