One-time negative angle forming die bending structure

Abstract

The utility model discloses a one-time negative angle forming die bending structure which comprises a bending cutter arranged on an upper die, a forming block and a fixing block, the forming block and the fixing block are arranged on a lower die, and the bending cutter comprises an upper connecting block, a rotating shaft and a flanging cutter connected to the lower portion of the upper connecting block through the rotating shaft in a coupling mode. The top of the upper connecting block is fixedly installed at the bottom of an upper base plate in the upper die, and the flanging cutter downwards penetrates through a discharging plate in the upper die. Corresponding to the installation position of the bending cutter, a forming block is installed on a lower fixing plate in the lower die in an embedded mode, fixing blocks are installed on the left side and the right side of the forming block at intervals, and the upper edges, facing the forming block, of the fixing blocks are arranged in a chamfering mode. The negative angle forming die is simple in structure and reasonable in design, the die space is effectively saved, the bending rebound effect of a high-strength plate can be fully utilized, negative angle forming is conducted firstly, then the plate rebounds, the bending angle in a formed product meets the 90-degree production requirement, the rejection rate of the product is reduced, and the quality and the machining efficiency of the formed product are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to processing mould technical field, concretely relates to one -off negative angle forming die bending structure. BACKGROUND

[0002] With the increasingly high production requirements, to meet the needs of use or design, stamping parts tend to be complex and high strength, and major die manufacturers are also faced with technical problems, when the bending processing of parts (such as Figure 1 The high strength of the production plate, the rebound problem of the plate after the product is bent 90 degrees by the general stamping die, makes the bending angle of the finally formed product greater than 90 degrees, which cannot meet the design requirements of the product, and causes the product scrap rate to increase. At the same time, since the stamping bending tool in the existing stamping die is fixed, when the die is closed and the plate is bent, the surface of the product plate is easily scratched, the formed plate is cut and thinned by the stamping tool, and the final forming quality of the product is affected. SUMMARY

[0003] The utility model discloses a one -off negative angle forming die bending structure to solve the rebound problem of the plate after bending.

[0004] To solve the above technical problems, the utility model adopts the technical scheme of a one -off negative angle forming die bending structure, which comprises a bending tool arranged on an upper die, a forming block arranged on a lower die and a fixed block, wherein the upper die comprises a top plate, an upper die block, an upper gasket, an upper fixed plate and a discharge plate arranged in sequence from top to bottom, the bending tool comprises an upper connecting block, a rotating shaft and a flanging tool connected to the lower part of the upper connecting block through the rotating shaft, the top of the upper connecting block is fixedly installed on the bottom of the upper gasket, and the flanging tool passes through the discharge plate downward.

[0005] The lower die comprises a lower die block, a lower gasket and a lower fixed plate arranged from bottom to top, and the installation position of the bending tool is corresponded, the forming block is embedded and installed on the lower fixed plate in the lower die, the fixed blocks are installed at the left and right sides of the forming block with intervals, and the upper edge of the fixed block facing the forming block is provided with an inverted corner.

[0006] Further, the vertical section of the bottom of the upper connecting block is in the shape of an inverted concave character, and the top of the flanging tool is accommodated in the bottom of the upper connecting block and is connected by swing through the rotating shaft.

[0007] Further, the side view projection of the flanging tool is provided with an upper wide and lower narrow structure, the width of the sliding cavity on the discharge plate is consistent up and down, and is equal to the width of the upper end of the flanging tool.

[0008] The bottom longitudinal section of the flanging cutter is in a "comma" shape, and the bottom end is rounded, and the side facing the fixed block is tangent to the upper edge chamfer of the fixed block.

[0009] Further, the forming block is a cuboid structure, and the upper part of the side facing the fixed block is arranged in a stepped shape, and the lower step is inwardly recessed.

[0010] Further, the height of the orthogonal projection of the recessed step surface in the forming block, the height of the orthogonal projection of the part of the upper edge chamfer of the fixed block, and the height of the orthogonal projection of the vertical wall part below the chamfer.

[0011] Further, one forming block corresponds to two bending cutters, and the two bending cutters act on the left and right sides of the forming block respectively to realize bidirectional bending forming.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the utility model has simple structure, reasonable design, effectively saves mold space, can fully utilize the bending rebound effect of high-strength plate, rebounds after negative angle forming, so that the bending angle of the formed product better reaches 90° production requirement, reduces product scrap rate, improves processing efficiency, and finally the product quality is good. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only a part of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor;

[0014] Figure 1 It is the schematic diagram of the bending formed product aimed at by the utility model;

[0015] Figure 2 It is the schematic diagram of the forming die installed and applied by the utility model;

[0016] Figure 3 It is the structural schematic diagram of the bending cutter in the utility model installed on the upper die;

[0017] Figure 4 It is the structural schematic diagram of the forming block and the fixed block in the utility model installed on the lower die;

[0018] Figure 5 It is the structural schematic diagram of the bending cutter in the utility model;

[0019] Figure 6 It is the sectional view of the bending cutter installation position in the utility model;

[0020] Figure 7This is a schematic structural diagram of the forming block in the present invention;

[0021] Figure 8 This is an assembly relationship diagram of the forming block and the fixing block in the utility model;

[0022] Figure 9 This is a diagram showing the assembly relationship between the bending tool and the forming block in the present invention;

[0023] In the figure: 1. upper die, 2. lower die, 3. bending tool, 4. forming block, 5. fixed block, 11. top plate, 12. upper die block, 13. upper pad, 14. upper fixed plate, 15. unloading plate, 151. sliding cavity, 21. lower die block, 22. lower pad, 23. lower fixed plate, 31. upper connecting block, 32. flanging tool, 33. rotating shaft, 41. recessed stepped surface. DETAILED DESCRIPTION

[0024] It should be noted that, in the description of the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "inside", "outside", "top", "bottom", "vertical", "longitudinal", "horizontal", "center", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only relational words determined for the convenience of describing the structural relationship of each component in the present invention, and do not specifically mean that any component in the present invention must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as a limitation on the present invention.

[0025] In addition, in the description of this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connected," "set," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; they can refer to direct connection or indirect connection through an intermediary. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0026] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings:

[0027] A one-time negative angle forming die bending structure is used in a processing Figure 1 The continuous mold of the double-hole glasses plate shown in FIG is located in the bending forming area of ​​the integral mold, as shown in FIG. Figures 2 to 4 As shown, the bending structure specifically includes a bending tool 3 arranged on the upper die 1, a forming block 4 and a fixing block 5 arranged on the lower die 2.

[0028] The upper die 1 includes a top plate 11, an upper module 12, an upper pad 13, an upper fixed plate 14 and a stripper plate 15 arranged in sequence from top to bottom, wherein the top plate 11, the upper module 12, the upper pad 13 and the upper fixed plate 14 are fixed in sequence by bolts; a plurality of nitrogen springs are fixedly installed at the bottom of the top plate 11, and the lower end of each nitrogen spring passes downward through the upper module 12, the upper pad 13 and the upper fixed plate 14 and is fixedly connected to the stripper plate 15, and the stripper plate 15 is driven by the nitrogen spring to move up and down relative to the upper fixed plate 14. Figure 5 and Figure 6 As shown, the bending tool 3 is a swinging tool, specifically comprising an upper connecting block 31, a rotating shaft 33, and a flanging tool 32. The upper connecting block 31 is vertically fixed to the bottom of the upper pad 13 by countersunk bolts. Its bottom end has an inverted concave cross-section. The top end of the flanging tool 32 is housed within the bottom end of the concave, and is laterally penetrated by the rotating shaft 33 to achieve a rotatable connection between the two. The lower end of the upper connecting block 31 extends downward from the upper fixed plate 14, and the flanging tool 32 passes downward through the stripper plate 15. The stripper plate 15 is provided with a sliding cavity 151 extending therethrough. The lateral projection of the flanging tool 32 is wide at the top and narrow at the bottom. The internal width of the sliding cavity 151 is consistent from top to bottom, equal to the upper width of the flanging tool 32, ensuring that the flanging tool 32 passes through while providing room for swinging. Furthermore, the bottom longitudinal cross-section of the flanging tool 32 is comma-shaped, with rounded corners at the bottom.

[0029] The lower die 2 includes a lower die block 21, a lower pad 22 and a lower fixed plate 23 which are arranged from bottom to top and fixed in sequence. Corresponding to the installation position of the bending tool 3, a rectangular parallelepiped forming block 4 is embedded and installed on the lower fixed plate 23 in the lower die 2. The top surface of the forming block 4 is flush with the upper surface of the upper fixed plate 23. Fixed blocks 5 are installed on both sides of the forming block 4 at intervals. The upper edge of the fixed block 5 facing the forming block 4 is chamfered. Figure 7 and Figure 8 As shown, the upper parts of the two side surfaces of the forming block 4 facing the fixed block 5 are both stepped, and the step surface at the bottom is slightly concave inward to form a concave step surface 41. The height of the positive projection of the concave step surface 41 can face the upper chamfer of the fixed block 5 and the vertical side wall below the chamfer.

[0030] Combine Figure 9As shown, the above one forming block 4 is provided with two bending tools 3, and the two bending tools 3 act on the left and right sides of the forming block 4 respectively. When the upper die 1 is downwardly closed, the flanging tool 32 of the bending tool 3 firstly contacts the product plate after pre-flanging from the pre-forming area. At this time, the product plate has been downwardly bent by nearly 60°. Due to the existence of the rotating shaft 33, the flanging tool 32 moves downwardly along with the inclination of the plate until the lower end of the flanging tool 32 abuts against the chamfer of the fixed block 5 on the same side. At this time, the lower end of the flanging tool 32 faces the side of the fixed block 5 and is tangent to the chamfer of the fixed block 5. The flanging tool 32 is limited by the chamfer and is extruded and contracted inwardly to further perform flanging and bending. With the continuous downward movement of the upper die 1 and the influence of the vertical wall of the fixed block and the recessed stepped surface 41 of the forming block 4, the lower end of the flanging tool 32 in the shape of a comma continues to bend the plate to the recessed stepped surface 41 by 1°-2°. After the closing and opening of the die, the plate is slightly expanded outwardly under the rebounding action of the stress of the plate itself, and the bending angle of the plate is accurately 90°. The flanging tool 32 in the above bending tool 3 is reset by the action of its own weight and is vertically contracted into the corresponding sliding cavity 151 of the discharge plate 15.

[0031] The related technical features in the above embodiment are designed according to the experience of the processed plate, and the related technical solutions that have not been mentioned or described can be realized by using or referring to the prior art.

[0032] Of course, the above description is not a limitation of the present application, and the present application is not limited to the above examples. The changes, modifications, additions or replacements made by the person skilled in the art within the essential scope of the present application should also belong to the protection scope of the present application.

Claims

1. A disposable negative angle forming mold bending structure, characterized by: It includes a bending tool provided on the upper die, a forming block and a fixed block provided on the lower die, wherein the upper die includes a top plate, an upper die block, an upper pad, an upper fixed plate and a stripper plate arranged in sequence from top to bottom, the bending tool includes an upper connecting block, a rotating shaft and a flanging tool connected to the lower part of the upper connecting block through the rotating shaft, the top of the upper connecting block is fixedly mounted on the bottom of the upper pad, and the flanging tool passes downward through the stripper plate; The lower mold includes a lower module, a lower pad and a lower fixed plate arranged from bottom to top, corresponding to the installation position of the bending tool. A forming block is embedded in the lower fixed plate in the lower mold, and fixed blocks are installed at intervals on the left and right sides of the forming block. The fixed blocks are chamfered facing the upper edge of the forming block.

2. The disposable negative angle coining die bending structure of claim 1, wherein: The vertical cross-section of the bottom of the upper connecting block is in an inverted concave shape, and the top of the flanging tool is accommodated in the bottom of the upper connecting block and is swingably connected via a rotating shaft.

3. The disposable negative angle coining die bending structure of claim 2, wherein: The side projection of the flanging tool is wide at the top and narrow at the bottom, and the width of the sliding cavity on the stripper plate is consistent from top to bottom and is equal to the width of the upper end of the flanging tool; The bottom longitudinal section of the flanging tool is in the shape of a "comma", and the bottom end is rounded, and the side facing the fixed block is tangent to the chamfer of the upper edge of the fixed block.

4. The disposable negative angle coining die bending structure of claim 1, wherein: The forming block is a rectangular parallelepiped structure, and the upper part of the side surface facing the fixing block is arranged in a stepped shape, and the stepped surface at the bottom is concave inwards.

5. The disposable negative angle coining die bending structure of claim 4, wherein: The orthographic projection height of the concave stepped surface in the forming block corresponds to the orthographic projection height of the chamfered portion of the upper edge of the fixing block and the orthographic projection height of the vertical wall portion below the chamfer.

6. The disposable negative angle coining die bending structure of claim 1, wherein: One forming block corresponds to two bending tools, and the two bending tools act on the left and right sides of the forming block respectively to achieve bidirectional bending forming.

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