Adjustable bending die for sheet metal parts

Abstract

The utility model discloses a kind of adjustable bending mould of sheet metal parts, it is related to bending machine technical field, including upper die, lower die, upper die is equipped with the upper groove containing driving inclined block, lower die is equipped with the lower groove containing flanging concave die, flanging concave die side is equipped with sheet metal part positioning frame;Flanging concave die includes push part and at least two arc forming units, push part is cooperated with driving inclined block through inclined plane, arc forming unit is sequentially spliced along length direction, the forming die cavity of different flanging curvature is arranged in each unit one side, the other side is equipped with the convex of adjacent unit die cavity concave-convex adaptation, and adjacent unit is detachably connected by bolt. By increasing or reducing the arc forming unit in front of target unit, the forming die cavity of required curvature can be quickly aligned to sheet metal part, combined with the adjusting structure of upper die and lower die, efficient switching and accurate processing of different flanging curvature are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of bending machines, in particular to an adjustable bending die for metal plates. Background Art

[0002] In the fields of mechanical equipment, automobile manufacturing and the like, a one-sided crimped hinged mounting plate is a common type of small metal connector (such as seat slide brackets, hatch hinges, hydraulic rod supports, etc.). Such parts have distinctive features: the external dimensions (including plate surface contour, mounting hole positions, etc.) of the same batch of plates are completely uniform, but due to differences in downstream assembly requirements (such as adapting to hinged shafts of different diameters, compensating assembly clearances, meeting customized decoration effects), a variety of crimping parameters (such as crimping fillet radius, crimping angle, etc.) need to be processed within the same batch.

[0003] In existing processing solutions, the sliding crimping die matched with a CNC bending machine is mainstream for crimping forming of such parts, such as Figure 1 as shown, it comprises an upper die 1 and a lower die 2, a guide rod 4 is arranged between the upper die 1 and the lower die 2, the upper die 1 is provided with a pressure plate 1-4 capable of moving up and down through an elastic member, a driving inclined block 1-3 is arranged on the lower end face of the upper die 1 at the side of the pressure plate 1-4, the upper end face of the lower die 2 is provided with a metal plate positioning frame 5 matched with the pressure plate 1-4, a crimping concave die 3 is arranged at the side of the metal plate positioning frame 5, the crimping concave die 3 comprises a pushing part 3-1 and an arc forming unit 3-2, the pushing part 3-1 is matched with the driving inclined block 1-3 to enable the crimping concave die 3 to move left and right on the upper end face of the lower die 2. During processing, the CNC bending machine drives the upper die 1 to move down along the guide rod 4, the pressure plate 1-4 presses against the small metal plate, the driving inclined block 1-3 cooperates with the pushing part 3-1 to drive the crimping concave die 3 to move towards one side of the metal plate, and the arc forming unit 3-2 completes the crimping processing of the small metal plate. Therefore, for processing requirements of different crimping parameters, the mode of "one die for one parameter" is usually adopted: that is, the crimping concave die 3 is separately designed and manufactured for each crimping fillet or angle. During processing, if it is necessary to switch crimping parameters, the original crimping concave die 3 needs to be disassembled from the lower die 2, then a new crimping concave die 3 is installed, and calibration and debugging are carried out again.

[0004] This traditional method has the following defects: High die cost: each set of crimping concave die needs to be designed and processed separately, including wire cutting, grinding and other processes, which increases the production cost of small and medium-sized enterprises for small-batch multi-specification crimping requirements.

[0005] Low die changing efficiency: replacing the crimping concave die requires steps such as shutdown, disassembly, installation and calibration, and a single die change takes a long time, resulting in long production interruption time and low equipment utilization, which is particularly difficult to adapt to the requirement of rapid switching of multiple specifications within the same batch.

[0006] Poor precision and stability: Frequent changes to the curling die can easily cause the relative positioning reference between the curling die and the lower die to shift, requiring repeated trial molding and adjustments. This not only further extends the production cycle but may also cause a decrease in the consistency of the curling dimensions, such as curling position deviation and uneven rounded corners, increasing the scrap rate. Utility Model Content

[0007] To address the aforementioned problems, the purpose of this utility model is to provide an adjustable bending die for metal sheets, thereby solving the problems of high cost and low efficiency caused by the need to frequently change the edge-rolling die to achieve different rounded edge rolling processes in the prior art.

[0008] The technical solution of this utility model is as follows: An adjustable bending die for metal sheets includes an upper die and a lower die. The upper die has an upper groove along its length that opens toward the lower die, and a driving inclined block is provided in the upper groove. The lower die has a lower groove along its length that opens toward the upper die, and a curling die is slidably provided in the lower groove. A metal sheet positioning frame is provided on the end face of the upper die next to the curling die. The curling die includes a pushing part and at least two arc forming units. The pushing part has an inclined surface adapted to the driving inclined block on the side away from the metal sheet positioning frame. The other side is connected to an arc forming unit, which is sequentially spliced ​​along the length of the curling die. Each arc forming unit has a forming cavity with a different curling curvature on the side near the metal sheet positioning frame, and a protrusion on the other side, which is adapted to the forming cavity of the adjacent arc forming unit. Adjacent arc forming units are detachably connected by bolts.

[0009] Because the arc-forming units are sequentially spliced ​​along the length of the curling die (the unit closest to the metal plate positioning frame is the front unit, and the unit closest to the pusher is the rear unit), and adjacent units are detachably connected by bolts and adapted to the cavity through protrusions, when a forming die cavity with a specific curling curvature is required, it is not necessary to disassemble the entire curling die: if the target is the frontmost arc-forming unit (closest to the positioning frame), simply retain that unit and all subsequent units; if the target is the middle arc-forming unit, only all arc-forming units in front of it (on the side closest to the positioning frame) need to be disassembled, retaining the middle unit and subsequent units; if the target is the rearmost arc-forming unit (closest to the pusher), then all arc-forming units in front of it need to be disassembled, retaining only the rear unit.

[0010] By using the above method, only a few units in front of the target unit need to be disassembled or installed to quickly align the forming cavity with the required curling curvature with the edge of the metal sheet. At the same time, the concave-convex adapter structure of adjacent units and the fixing of bolts can ensure that the relative positioning reference of the retained unit with the push part and the lower groove remains unchanged, without the need to recalibrate the entire mold, thereby realizing the rapid switching of different curling curvatures. This avoids the replacement cost of the entire set of cavities and greatly shortens the mold change time.

[0011] Furthermore, the upper mold includes an upper mold base, the lower end of which is connected to an upper mounting base. The upper mounting base has a through-groove, and the inner wall of the upper groove is provided with a limiting boss. The upper end face of the driving inclined block extends with a stop edge that cooperates with the limiting boss.

[0012] Furthermore, the upper mounting base is rotatably connected to a threaded rod along its length, the threaded rod being parallel to the extension direction of the upper groove; one end of the threaded rod passes through the outer wall of the upper mounting base, passes through the driving wedge, and is rotatably connected to the inner wall of the upper mounting base near the metal plate positioning frame; the driving wedge has a threaded hole that mates with the threaded rod, and the end of the threaded rod located outside the upper mounting base has an internal hexagon blind hole; when the internal hexagon blind hole at the end of the threaded rod is tightened with an internal hexagon wrench, the rotational motion of the threaded rod can be converted into the linear sliding of the driving wedge along the length direction of the upper groove, the core function of which is to accurately calibrate the initial contact position between the driving wedge and the inclined surface of the edge-rolling die pushing part.

[0013] Furthermore, after the drive inclined block is assembled, its upper end face does not fit with the lower end face of the upper mold. The core function of this setting is to reserve a movement gap for the drive inclined block to avoid interference or frictional resistance during sliding.

[0014] Furthermore, the lower mold includes a lower mold base, the upper end of which is connected to a lower mounting base, and the lower mounting base has a through-groove; the lower end face of the pushing part of the edge-rolling die is provided with a slider, and the slider is slidably engaged with the lower groove.

[0015] Furthermore, the lower mounting base is provided with a connecting rod along its length, the connecting rod being parallel to the extension direction of the lower groove; a stop block is provided on the side of the lower mounting base near the metal plate positioning frame, one end of the connecting rod passes through the stop block, passes through the slider, and is connected to a locking nut at the end; the connecting rod section outside the lower mounting base is threaded, and an adjusting nut is threaded onto the thread; a spring is sleeved on the outer circumference of the connecting rod, one end of the spring abuts against the stop block, and the other end abuts against the slider. After the arc forming unit is replaced (e.g., the number of units is increased or decreased), the overall length of the crimping die will change, but the position of the metal plate to be processed remains unchanged. Therefore, the initial position adaptation needs to be achieved by axial movement of the connecting rod: the adjusting nut is threaded onto the threaded section of the connecting rod outside the lower mounting base. By rotating the adjusting nut, its position on the threaded section is changed, thereby changing the length of the connecting rod inside the lower mounting base. The stop block fixedly connected to the connecting rod drives the crimping die to slide along the lower groove, achieving the initial positioning.

[0016] Furthermore, there are three arc-forming units, including a first arc-forming unit near the metal plate positioning frame, a second arc-forming unit located in the middle, and a third arc-forming unit near the pushing part; the third arc-forming unit is fixedly connected to the pushing part.

[0017] Furthermore, the two side walls of the first arc-forming unit extend horizontally toward the second arc-forming unit to form a first connecting plate, and the two side walls of the second arc-forming unit extend horizontally toward the third arc-forming unit to form a second connecting plate; the first connecting plate corresponding to the second arc-forming unit and the second connecting plate corresponding to the third arc-forming unit are detachably connected by bolts.

[0018] The beneficial effects of this utility model are as follows: 1. The hemming die of this utility model adopts a modular combination structure of "pushing part + at least two detachable arc forming units", and each unit is matched with the forming cavity by protrusions and fixed by bolts, so that a single set of dies can be compatible with the processing requirements of various hemming curvatures. This structure not only reduces the design and manufacturing cost of special dies, but also achieves flexible switching of hemming parameters by quickly adding or removing units, thereby improving the versatility and economy of the die.

[0019] 2. The threaded rod adjustment mechanism of the upper mold and the connecting rod adjustment mechanism of the lower mold form a two-way adaptation system: the upper mold precisely adjusts the contact position between the driving inclined block and the inclined surface of the pushing part through the threaded rod, while the lower mold drives the edge-rolling die to slide along the lower groove through the adjusting nut to adapt to the length changes after the addition or reduction of units. The dual adjustment structure ensures that different combinations of arc-forming units can accurately align with the positioning reference and driving components of the metal sheet, reducing processing errors caused by positioning deviations and improving the consistency and processing accuracy of the edge-rolling dimensions.

[0020] 3. The concave-convex fitting structure of the arc-shaped molding unit and the bolt connection design of the connecting plates on both sides ensure the rigidity and positional stability of the unit after assembly, while simplifying the unit disassembly / installation process. This structure eliminates the need for repeated calibration of the reference during mold changing, shortens the time for a single mold change, reduces the impact of frequent disassembly and assembly on mold positioning accuracy, and improves equipment utilization and the stability of mass production. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the existing sliding edge-rolling mold structure.

[0022] Figure 2 This is a schematic diagram of the structure of this utility model.

[0023] Figure 3 This is a disassembly diagram of the upper mounting base of this utility model.

[0024] Figure 4 This is a disassembly diagram of the lower mounting base of this utility model.

[0025] Figure 5 This is a schematic diagram showing the disassembly of the edge-rolling die of this utility model.

[0026] Figure 6 This is a cross-sectional schematic diagram of the curling die of this utility model with different curling curvatures.

[0027] Reference numerals: 1. Upper mold; 1-1. Upper mold base; 1-2. Upper mounting base; 1-2.1. Upper groove; 1-3. Driving inclined block; 1-4. Pressure plate; 1-5. Threaded rod; 2. Lower mold; 2-1. Lower mounting base; 2-1.1. Lower groove; 2-2. Connecting rod; 2-3. Stop block; 2-4. Locking nut; 2-5. Adjusting nut; 2-6. Lower mold base; 3. Hemming die; 3-1. Pushing part; 3-1.1. Slider; 3-2. Arc forming unit; 3-2.1. First arc forming unit; 3-2.1.1. Forming cavity; 3-2.1.2. First connecting plate; 3-2.2. Second arc forming unit; 3-2.2.1. Second connecting plate; 3-2.3. Third arc forming unit; 4. Guide rod; 5. Metal plate positioning frame. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0029] like Figures 1 to 6 As shown, an adjustable bending die for metal sheets includes an upper die 1 and a lower die 2. The upper die 1 has an upper groove 1-2.1 opening toward the lower die 2 along its length, and a driving inclined block 1-3 is provided in the upper groove 1-2.1. The lower die 2 has a lower groove 2-1.1 opening toward the upper die 1 along its length, and a curling die 3 is slidably provided in the lower groove 2-1.1. A metal sheet positioning frame 5 is provided on the end face of the upper die 1 next to the curling die 3. The curling die 3 includes a pushing part 3-1 and at least two arc forming units 3-2. The moving part 3-1 has an inclined surface on the side away from the metal plate positioning frame 5 that is adapted to the driving inclined block 1-3; the other side is connected to an arc forming unit 3-2, which is spliced ​​sequentially along the length of the curling die 3. Each arc forming unit 3-2 has a forming cavity 3-2.1.1 with different curling curvature on the side near the metal plate positioning frame 5, and a protrusion on the other side. The protrusion is adapted to the forming cavity 3-2.1.1 of the adjacent arc forming unit 3-2. The adjacent arc forming units 3-2 are detachably connected by bolts.

[0030] Since the arc forming units 3-2 are sequentially spliced ​​along the length of the curling die 3 (the ones closer to the metal plate positioning frame 5 are the front units, and the ones closer to the pusher 3-1 are the rear units), and adjacent units are detachably connected by bolts and adapted to the cavity through protrusions, when a forming die cavity 3-2.1.1 with a specific curling curvature is required, it is not necessary to disassemble the entire curling die 3: if the target is the frontmost arc forming unit 3-2 (close to the positioning frame), simply retain this unit and all subsequent units; if the target is the middle arc forming unit 3-2, only all the arc forming units 3-2 in front of it (on the side closer to the positioning frame) need to be disassembled, and the middle unit and subsequent units are retained; if the target is the rearmost arc forming unit 3-2 (close to the pusher 3-1), then all the arc forming units 3-2 in front of it need to be disassembled, and only the rear unit is retained.

[0031] By using the above method, only a few units in front of the target unit need to be disassembled or installed to quickly align the forming cavity 3-2.1.1 with the required curling curvature with the edge of the metal plate. At the same time, the concave-convex adapter structure of the adjacent units and the fixing of the bolts can ensure that the relative positioning reference of the retained unit with the push part 3-1 and the lower groove 2-1.1 remains unchanged, without the need to recalibrate the entire mold. This allows for quick switching between different curling curvatures, avoiding the replacement cost of the entire set of cavities and significantly shortening the mold change time.

[0032] Furthermore, the upper mold 1 includes an upper mold base 1-1, the lower end of which is connected to an upper mounting base 1-2. The upper mounting base 1-2 has an upper groove 1-2.1 extending through it. The inner wall of the upper groove 1-2.1 is provided with a limiting boss. The upper end face of the driving inclined block 1-3 extends with a stop edge that cooperates with the limiting boss.

[0033] Furthermore, the upper mounting base 1-2 is rotatably connected to a threaded rod 1-5 along its length direction. The threaded rod 1-5 is parallel to the extension direction of the upper groove 1-2.1. One end of the threaded rod 1-5 passes through the outer wall of the upper mounting base 1-2, passes through the drive wedge 1-3, and is rotatably connected to the inner wall of the upper mounting base 1-2 near the metal plate positioning frame 5. The drive wedge 1-3 has a threaded hole that mates with the threaded rod 1-5. The end of the threaded rod 1-5 located outside the upper mounting base 1-2 has an internal hexagon blind hole. When the internal hexagon blind hole at the end of the threaded rod 1-5 is tightened with an internal hexagon wrench, the rotational motion of the threaded rod 1-5 can be converted into the linear sliding of the drive wedge 1-3 along the length direction of the upper groove 1-2.1. Its core function is to accurately calibrate the initial contact position between the drive wedge 1-3 and the inclined surface of the pressing die 3 push part 3-1.

[0034] Furthermore, after the drive inclined block 1-3 is assembled, its upper end face does not fit with the lower end face of the upper mold 1. The core function of this setting is to reserve a movement gap for the drive inclined block 1-3 to avoid interference or frictional resistance during sliding.

[0035] Furthermore, the lower mold 2 includes a lower mold base 2-6, and a lower mounting base 2-1 is connected to the upper end of the lower mold base 2-6. The lower mounting base 2-1 has a through groove 2-1.1. The lower end face of the pushing part 3-1 of the edge rolling die 3 is provided with a slider 3-1.1, and the slider 3-1.1 slides in cooperation with the lower groove 2-1.1.

[0036] Furthermore, the lower mounting base 2-1 is provided with a connecting rod 2-2 along its length, and the connecting rod 2-2 is parallel to the extending direction of the lower groove 2-1.1; a stop block 2-3 is provided on the side of the lower mounting base 2-1 near the metal plate positioning frame 5, one end of the connecting rod 2-2 passes through the stop block 2-3, passes through the slider 3-1.1, and is connected to a locking nut 2-4 at the end; the connecting rod section of the connecting rod 2-2 outside the lower mounting base 2-1 is threaded, and an adjusting nut 2-5 is screwed into the thread; a spring is sleeved on the outer circumference of the connecting rod 2-2, one end of the spring abuts against the stop block 2-3, and the other end abuts against the slider 3-1.1, arc After the forming unit 3-2 is replaced (e.g., the number of units is increased or decreased), the overall length of the crimping die 3 will change, but the position of the metal sheet to be processed remains unchanged. Therefore, the initial position needs to be adapted by axial movement of the connecting rod 2-2: the adjusting nut 2-5 is screwed onto the threaded section of the connecting rod 2-2 located outside the lower mounting base 2-1. By rotating the adjusting nut 2-5, its position on the threaded section is changed, thereby changing the length of the connecting rod 2-2 located inside the lower mounting base 2-1. The stop block 2-3 fixedly connected to the connecting rod 2-2 drives the crimping die 3 to slide along the lower groove 2-1.1 to achieve the initial positioning.

[0037] Furthermore, there are three arc-forming units 3-2, including a first arc-forming unit 3-2.1 near the metal plate positioning frame 5, a second arc-forming unit 3-2.2 in the middle, and a third arc-forming unit 3-2.3 near the pushing part 3-1; the third arc-forming unit 3-2.3 is fixedly connected to the pushing part 3-1.

[0038] Furthermore, the two side walls of the first arc-shaped forming unit 3-2.1 extend horizontally toward the second arc-shaped forming unit 3-2.2 to form a first connecting plate 3-2.1.2, and the two side walls of the second arc-shaped forming unit 3-2.2 extend horizontally toward the third arc-shaped forming unit 3-2.3 to form a second connecting plate 3-2.2.1; the first connecting plate 3-2.1.2 corresponding to the second arc-shaped forming unit 3-2.2 and the second connecting plate 3-2.2.1 corresponding to the third arc-shaped forming unit 3-2.3 are detachably connected by bolts.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An adjustable bending die for metal sheets, comprising an upper die and a lower die, characterized in that, The upper mold has an upper groove along its length that faces the opening of the lower mold, and a driving inclined block is provided in the upper groove. The lower mold has a lower groove along its length that faces the opening of the upper mold, and a curling die is slidably provided in the lower groove. A metal plate positioning frame is provided on the end face of the upper mold next to the curling die. The curling die includes a pushing part and at least two arc forming units. The pushing part has an inclined surface adapted to the driving inclined block on one side away from the metal plate positioning frame. The other side is connected to an arc forming unit. The arc forming units are sequentially spliced ​​along the length of the curling die. Each arc forming unit has a forming cavity with a different curling curvature on one side near the metal plate positioning frame, and a protrusion on the other side. The protrusion is adapted to the forming cavity of the adjacent arc forming unit. The adjacent arc-shaped forming units are detachably connected by bolts.

2. The adjustable bending die for metal sheets according to claim 1, characterized in that, The upper mold includes an upper mold base, and an upper mounting base is connected to the lower end of the upper mold base. The upper mounting base has an upper groove through which the upper groove is formed. A limiting boss is provided on the inner wall of the upper groove. A stop edge that cooperates with the limiting boss extends from the upper end face of the driving inclined block.

3. The adjustable bending die for metal sheets according to claim 2, characterized in that, The upper mounting base is rotatably connected to a threaded rod along its length, and the threaded rod is parallel to the extension direction of the upper groove; one end of the threaded rod passes through the outer wall of the upper mounting base, passes through the drive inclined block, and is rotatably connected to the inner wall of the upper mounting base near the metal plate positioning frame; the drive inclined block has a threaded hole that mates with the threaded rod, and the end of the threaded rod located outside the upper mounting base has an internal hexagon blind hole.

4. The adjustable bending die for metal sheets according to claim 2, characterized in that, After the drive ramp is assembled, its upper end face does not fit against the lower end face of the upper mold.

5. The adjustable bending die for metal sheets according to claim 1, characterized in that, The lower mold includes a lower mold base, and a lower mounting base is connected to the upper end of the lower mold base. The lower mounting base has a through-groove. The lower end face of the pushing part of the edge-rolling die is provided with a slider, and the slider is slidably engaged with the lower groove.

6. The adjustable bending die for metal sheets according to claim 5, characterized in that, The lower mounting base is provided with a connecting rod along its length, and the connecting rod is parallel to the extension direction of the lower groove; the lower mounting base is provided with a stop block on the side near the metal plate positioning frame, and one end of the connecting rod passes through the stop block, passes through the slider, and is connected to a locking nut at the end; The connecting rod section located outside the lower mounting base is threaded, and an adjusting nut is screwed into the thread. A spring is sleeved on the outer circumference of the connecting rod, with one end of the spring abutting against a stop block and the other end abutting against a slider.

7. The adjustable bending die for metal sheets according to claim 1, characterized in that, There are three arc-forming units, including a first arc-forming unit near the metal plate positioning frame, a second arc-forming unit in the middle, and a third arc-forming unit near the pushing part; the third arc-forming unit is fixedly connected to the pushing part.

8. The adjustable bending die for metal sheets according to claim 7, characterized in that, The first arc-shaped forming unit has two side walls extending horizontally toward the second arc-shaped forming unit to form a first connecting plate, and the second arc-shaped forming unit has two side walls extending horizontally toward the third arc-shaped forming unit to form a second connecting plate; the first connecting plate corresponding to the second arc-shaped forming unit and the second connecting plate corresponding to the third arc-shaped forming unit are detachably connected by bolts.

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