Arc bending universal die

Abstract

The utility model discloses a kind of general mould of arc bending, comprising: upper die holder, detachably with bending machine motion end fixed connection;Die, fixed in the lower end of upper die holder, and outer contour is cylindrical;At least one die ring, tubular, in turn outer sleeve in die outer surface;Lower die holder;Lower die holder, detachably set on lower die holder, directly opposite die;The upper surface of the lower die holder is equipped with the die groove directly opposite die;Deformation adjustment component, set on the opposite side wall of die groove, adjust the width of die groove;Deformation strip, set on die groove, located directly below deformation adjustment component;The deformation strip is deformed to the bottom of die groove under the pressing of die. The utility model can be suitable for different arc diameter sheet metal bending requirement, reduce the cost of custom mold.

Description

Technical Field

[0001] This utility model relates to the field of arc bending processing molds, specifically to a general-purpose arc bending mold. Background Technology

[0002] Circular bends are a common process in sheet metal fabrication, referring to bending flat metal sheets into a continuous arc shape (rather than a sharp angle). The main difference between this and a regular "V-bend" (which forms an acute or obtuse angle) is that the bent area is a smooth arc.

[0003] The main methods for achieving arc bending include rolling, segmented bending (step bending), and die forming. The rolling method uses a plate rolling machine; the sheet metal is repeatedly rolled by three (or four) rollers arranged in a triangle, gradually bending it into the desired arc radius. This method is suitable for large-radius arcs (radius much larger than the plate thickness) and is commonly used to make cylinders, pipes, and curved shells. It is also the most common method for forming complete circles or large arcs. Segmented bending (step bending) uses a CNC bending machine with a pointed die (small-angle upper die) to divide the entire arc into many very small straight segments (step distance). A small-angle bend is performed at each segment. The smaller the bending step distance, the smaller the increase in bending angle, and the closer the resulting "polygon" is to a smooth arc. This method is suitable for small to medium-radius arcs (radius usually in the range of several to ten times the plate thickness) and is the most common way to achieve arcs on a bending machine. Its advantage is high flexibility; it can process arcs and straight bends of different radii on the same part. The disadvantages are that there will be tiny ridges on the surface (which may not be obvious to the naked eye, but can be felt by touch), and the processing speed is relatively slow. Compression molding uses specialized arc-shaped upper and lower dies on a bending machine or press. The working surfaces of the upper and lower dies of the bending machine or press are themselves designed with an arc shape, and this method can form the required arc in a single stamping. It is suitable for specific radii and mass production, but requires custom molds, resulting in higher costs, but the processing speed per piece is fast, and the arc quality is high (smoother).

[0004] Compression molding has significant advantages in specific production environments and requirements due to its production efficiency. However, its specific custom mold requirements impose higher costs on the production of sheet metal bending with different arc diameters. Utility Model Content

[0005] In view of the above-mentioned deficiencies of the prior art, the purpose of this utility model is to provide a universal arc bending mold that can be used for sheet metal bending needs with different arc diameters, thereby reducing the cost of custom molds.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A general-purpose die for arc bending includes:

[0008] The upper die base is detachably fixed to the moving end of the bending machine;

[0009] The die is fixed at the lower end of the upper die base, and its outer contour is cylindrical.

[0010] At least one mold ring, in the form of a tube, is sequentially fitted onto the outer surface of the mold;

[0011] Lower mold base;

[0012] The lower mold frame is detachably mounted on the lower mold base and faces the pressing mold; the upper surface of the lower mold frame is provided with a pressing mold groove that faces the pressing mold.

[0013] The deformation adjustment component is set on the opposite side wall of the molding groove to adjust the width of the molding groove;

[0014] A deformation strip is disposed on the die groove, located directly below the deformation adjustment component; the deformation strip deforms toward the bottom of the die groove under the downward pressure of the die.

[0015] Furthermore, the upper mold base includes:

[0016] The upper end of the load-bearing plate abuts against the lower end of the top plate at the moving end of the bending machine, and the lower end is fixedly connected to the pressing die.

[0017] The control panel is located on one side of the load-bearing plate and is detachably connected to the moving end of the bending machine to control the load-bearing plate and the bending machine.

[0018] Furthermore, the upper end of the control plate extends beyond the upper end of the force plate; when the upper die base is fixedly connected to the moving end of the bending machine, the surface of the control plate is in contact with the side of the top plate of the moving end of the bending machine; the outer side of the control plate is provided with a limiting groove, which is directly opposite the side of the top plate of the moving end of the bending machine; the moving end of the bending machine is provided with a hook plate for opening and closing; the hook plate is provided with a limiting protrusion that matches the limiting groove;

[0019] After the hook plate is fixed to the moving end of the bending machine, the limiting protrusion is engaged with the limiting control plate and the top plate of the moving end of the bending machine, and the upper end surface contacts the lower end of the top plate of the moving end of the bending machine.

[0020] Furthermore, the mold is cylindrical, and its axis is coplanar with the axis of the force-bearing plate.

[0021] The mold ring is a cylindrical tube with an opening, and the outer sleeve is inserted into the outer surface of the mold. The force plate passes through the opening of the mold ring.

[0022] Furthermore, the open end of the mold ring is provided with a force-bearing protrusion; the force-bearing plate is provided with a force-bearing groove corresponding to the force-bearing protrusion; when the mold ring and the deformation strip are pressed against each other, the force-bearing groove limits the displacement of the force-bearing protrusion, thereby controlling the deformation of the mold ring under force.

[0023] Furthermore, the force-bearing protrusion includes:

[0024] The connecting part is fixed to the open end of the mold ring at one end, and the other end is partially located in the stress groove, with its surface fitting the stress groove.

[0025] The insert is located in the stress-bearing groove, and its surface fits into the stress-bearing groove. One end of the insert is fixed to the connecting part. The cross-sectional profile of the insert in the normal direction of the stress-bearing plate is misaligned with the cross-sectional profile of the connecting part in the normal direction of the stress-bearing plate, or the cross-sectional profile of the insert in the normal direction of the stress-bearing plate is larger than the cross-sectional profile of the connecting part in the normal direction of the stress-bearing plate.

[0026] Furthermore, the outer contours at both ends of the long side of the force-bearing protrusion shrink as the distance from the end face decreases.

[0027] Furthermore, the lower mold frame includes:

[0028] The clamping part is U-shaped and is fastened to the lower mold base, with its bottom inner surface in contact with the upper surface of the lower mold base; fasteners are provided on the two opposite wing plates of the clamping part to fix the clamping part and the lower mold base respectively.

[0029] A mold base is disposed on the bottom outer surface of the clamping part; the mold base is provided with a mold groove facing the mold; the mold groove includes a bottom groove and an expansion groove; the bottom groove is U-shaped, and the deformation adjustment component is disposed on the opposite side wall of the bottom groove; the expansion groove is disposed on the opposite side wall of the bottom groove, so that the mold groove is stepped; the deformation strip is disposed at the bottom of the expansion groove.

[0030] Furthermore, the deformation adjustment assembly includes two sets of groove width adjustment units respectively disposed on opposite sidewalls of the bottom groove; the groove width adjustment unit includes:

[0031] Several pads, each with a perforation in the center, are sequentially fitted onto the side wall of the bottom groove, with the upper end flush with the bottom of the groove and the lower end flush with the bottom of the bottom groove.

[0032] The fixing block has a perforation in the middle and is fitted to the outermost pad surface. Its upper end is flush with the bottom of the expansion groove and its lower end is flush with the bottom of the bottom groove. The upper end surface and the outer surface of the fixing block are rounded.

[0033] Fixing screws are passed through the holes of the fixing block and several pads in sequence and connected to the side wall of the bottom groove to fix the fixing block and several pads to the bottom groove.

[0034] Furthermore, it also includes two side sealing plates; the side sealing plates are fixed to the end faces of the force-bearing plate, and the side sealing plates limit the position of the mold ring end face; the side sealing plates cover the upper part of the mold and the mold ring, or their outer contour is smaller than the outermost mold ring and larger than the next outermost mold ring.

[0035] Due to the adoption of the above technical solution, this utility model has the following advantages:

[0036] 1. By setting the upper mold to a layered structure, the radius of the upper mold can be quickly changed, so as to meet the needs of producing sheet metal bending with different arc diameters with one set of upper mold.

[0037] 2. The lower die uses a deformation strip as a force-bearing component corresponding to the upper die. It can automatically adapt to the radius of the upper die to ensure that the bending deformation of the processed sheet metal reaches the expected level.

[0038] 3. The lower mold uses a deformation adjustment component to adapt to the mold ring of the upper mold, so that the sheet metal can be fully stressed (compressed) during bending deformation, thereby quickly realizing sheet metal bending and forming.

[0039] 4. For small-batch, multi-variety trial production and sampling, it can be installed and adjusted quickly at low cost, optimize products, and improve work efficiency.

[0040] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0041] The accompanying drawings of this utility model are described below:

[0042] Figure 1 This is a cross-sectional view of the general-purpose mold for arc bending in Example 1.

[0043] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle.

[0044] Figure 3 for Figure 1 Enlarged structural diagram at point B.

[0045] Figure 4 This is a cross-sectional view of the general-purpose mold for arc bending in Example 2.

[0046] Figure 5 This is a side view of the general-purpose mold for arc bending in Example 2.

[0047] Figure 6This is a side view of the general-purpose mold for arc bending in Example 3.

[0048] In the diagram: 11. Force plate; 111. Force groove; 12. Control plate; 121. Limiting groove; 2. Press mold; 3. Mold ring; 31. Opening; 321. Connecting part; 322. Inserting part; 4. Lower mold base; 51. Clamping part; 511. Fastener; 52. Press mold base; 5211. Bottom groove; 5212. Expanding groove; 61. Pad block; 62. Fixing block; 63. Fixing screw; 7. Deformation strip; 8. Side sealing plate; 9. Bending machine moving end; 91. Hook plate; 911. Limiting protrusion. Detailed Implementation

[0049] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0050] Example 1:

[0051] like Figure 1 , Figure 2 , Figure 3 As shown, a general-purpose die for arc bending includes:

[0052] The upper die base is detachably fixed to the moving end 9 of the bending machine;

[0053] The compression mold 2 is fixed at the lower end of the upper mold base, and its outer contour is cylindrical.

[0054] At least one mold ring 3, which is tubular, is sequentially fitted onto the outer surface of the compression mold 2;

[0055] Lower mold base 4;

[0056] The lower mold frame is detachably mounted on the lower mold base 4, facing the pressing mold 2; the upper surface of the lower mold frame is provided with a pressing groove facing the pressing mold 2;

[0057] The deformation adjustment component is set on the opposite side wall of the molding groove to adjust the width of the molding groove;

[0058] The deformation strip 7 is disposed on the molding groove and located directly below the deformation adjustment component; the deformation strip 7 deforms towards the bottom of the molding groove under the pressure of the molding die 2.

[0059] In this embodiment, the upper mold base includes:

[0060] The upper end of the load-bearing plate 11 abuts against the lower end of the top plate of the moving end 9 of the bending machine, and the lower end is fixedly connected to the pressure mold 2.

[0061] The control board 12 is located on one side of the force plate 11 and is detachably connected to the moving end 9 of the bending machine, thereby controlling the force plate 11 to be fixedly connected to the bending machine.

[0062] In this embodiment, the upper end of the control plate 12 extends beyond the upper end of the force plate 11; when the upper die base is fixedly connected to the bending machine moving end 9, the plate surface of the control plate 12 is in contact with the side of the top plate of the bending machine moving end; the outer side of the control plate 12 is provided with a limiting groove 121, and the limiting groove 121 is directly opposite the side of the top plate of the bending machine moving end 9; the bending machine moving end 9 is provided with a hook plate 91 for opening and closing; the hook plate 91 is provided with a limiting protrusion 911 that matches the limiting groove 121;

[0063] After the hook plate 91 is fixed to the moving end 9 of the bending machine, the limiting protrusion 911 is engaged with the limiting control plate 12 and the top plate of the moving end 9 of the bending machine, and the upper end surface contacts the lower end of the top plate of the moving end 9 of the bending machine.

[0064] In this embodiment, the mold 2 is cylindrical, and its axis is coplanar with the axis of the force plate 11.

[0065] The mold ring 3 is a cylindrical tube with an opening 31, and its outer sleeve is inserted into the outer surface of the mold 2. The force plate 11 passes through the opening 31 of the mold ring 3.

[0066] In this embodiment, the opening 31 end of the mold ring 3 is provided with a force-bearing protrusion; the force plate 11 is provided with a force-bearing groove 111 corresponding to the force-bearing protrusion; when the mold ring 3 and the deformation strip 7 are pressed against each other, the force-bearing groove 111 limits the displacement of the force-bearing protrusion and controls the deformation of the mold ring 3 under force.

[0067] In this embodiment, the force-bearing protrusion includes:

[0068] The connecting part 321 is fixedly connected at one end to the opening 31 end of the mold ring 3, and the other end is located in the force-receiving groove 111, with its surface fitting in contact with the force-receiving groove 111;

[0069] The insert portion 322 is located inside the force-bearing groove 111, and its surface is in contact with the force-bearing groove 111. One end of the insert portion 322 is fixedly connected to the connecting portion 321. The cross-sectional profile of the insert portion 322 in the normal direction of the force-bearing plate 11 is misaligned with the cross-sectional profile of the connecting portion 321 in the normal direction of the force-bearing plate 11, or the cross-sectional profile of the insert portion 322 in the normal direction of the force-bearing plate 11 is larger than the cross-sectional profile of the connecting portion 321 in the normal direction of the force-bearing plate 11.

[0070] In this embodiment, the outer contours of the two ends of the long side of the force-bearing protrusion shrink as the distance from the end face decreases.

[0071] In this embodiment, the lower mold frame includes:

[0072] The clamping part 51 is U-shaped and is fastened to the lower mold base 4. Its bottom inner surface is in contact with the upper surface of the lower mold base 4. Fasteners 511 are provided on the two opposite wing plates of the clamping part 51 to fix the clamping part 51 and the lower mold base 4 respectively.

[0073] A molding base 52 is disposed on the bottom outer surface of the clamping part 51; the molding base 52 is provided with a molding groove facing the molding die 2; the molding groove includes a bottom groove 5211 and an expansion groove 5212; the bottom groove 5211 is U-shaped, and the deformation adjustment component is disposed on the opposite side wall of the bottom groove 5211; the expansion groove 5212 is disposed on the opposite side wall of the bottom groove 5211, making the molding groove stepped; the deformation strip 7 is disposed at the bottom of the expansion groove 5212.

[0074] In this embodiment, the deformation adjustment assembly includes two sets of groove width adjustment units respectively disposed on opposite sidewalls of the bottom groove 5211; the groove width adjustment unit includes:

[0075] Several pads 61, each with a perforation in the middle, are sequentially fitted onto the side wall of the bottom groove 5211, with their upper ends flush with the bottom of the expansion groove 5212 and their lower ends flush with the bottom of the bottom groove 5211.

[0076] The fixing block 62 has a through hole in the middle and is fitted to the outer surface of the outermost pad block 61. Its upper end is flush with the bottom of the expansion groove 5212 and its lower end is flush with the bottom of the bottom groove 5211. The upper end surface and the outer surface of the fixing block 62 are rounded.

[0077] The fixing screw 63 passes through the holes of the fixing block 62 and several pads 61 in sequence and connects to the side wall of the bottom groove 5211 to fix the fixing block 62 and several pads 61 to the bottom groove 5211.

[0078] In this embodiment, the universal die for arc bending is used as follows: A suitable die ring 3 is selected according to the required bending radius, and grease is applied to the surface of the die 2. The die ring 3 is then fitted over the die 2 from one end. The reduced diameter on the force-bearing protrusion of the die ring 3 facilitates the insertion of the force-bearing protrusion into the force-bearing groove 111.

[0079] Adjust the number of pads 61 according to the radius of the mold ring 3 so that the spacing between the two fixing blocks 62 is suitable for the radius of the mold ring 3. That is, after the mold ring 3 presses down on the deformable strip 7, the deformable strip 7 can fit as close to the mold ring 3 as possible under the mutual compression of the mold ring 3 and the fixing blocks 62, so that the sheet metal located between the mold ring 3 and the deformable strip 7 is effectively bent. Finally, place the deformable strip 7 into the expansion groove 5212.

[0080] Example 2:

[0081] like Figure 4 , Figure 5As shown, the difference between this embodiment and Embodiment 1 is that four mold rings 3 are used, thereby increasing the bending radius of the sheet metal. The device also includes two side sealing plates 8; the side sealing plates 8 are fixedly connected to the end face of the force-bearing plate 11, and the side sealing plates 8 limit the position of the end face of the mold rings 3; the side sealing plates 8 also shield the upper part of the pressing mold 2 and the mold rings 3.

[0082] The side sealing plate 8 allows for relative sliding between the mold rings 3 and between the mold rings 3 and the pressure mold 2 during multiple uses of this mold.

[0083] Example 3:

[0084] like Figure 6 As shown, the difference between this embodiment and embodiment 2 is that the outer contour of the side sealing plate 8 in this embodiment is smaller than that of the outermost mold ring 3 and larger than that of the second outermost mold ring 3.

[0085] With this design, when the sheet metal is bent into a circular shape as much as possible, the side sealing plate 8 will not interfere with the radius after bending and deformation, compared to embodiment 2.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A universal die for arc bending, characterized in that, include: The upper die base is detachably fixed to the moving end of the bending machine; The die is fixed at the lower end of the upper die base, and its outer contour is cylindrical. At least one mold ring, in the form of a tube, is sequentially fitted onto the outer surface of the mold; Lower mold base; The lower mold frame is detachably mounted on the lower mold base and faces the pressing mold; the upper surface of the lower mold frame is provided with a pressing mold groove that faces the pressing mold. The deformation adjustment component is set on the opposite side wall of the molding groove to adjust the width of the molding groove; The deformation strip is set on the molding groove, located directly below the deformation adjustment component; The deformable strip deforms towards the bottom of the die groove under the pressure of the die.

2. The universal die for arc bending according to claim 1, characterized in that, The upper mold base includes: The upper end of the load-bearing plate abuts against the lower end of the top plate at the moving end of the bending machine, and the lower end is fixedly connected to the pressing die. The control panel is located on one side of the load-bearing plate and is detachably connected to the moving end of the bending machine to control the load-bearing plate and the bending machine.

3. The universal die for arc bending according to claim 2, characterized in that, The upper end of the control plate extends beyond the upper end of the force plate; when the upper die base is fixedly connected to the moving end of the bending machine, the surface of the control plate is in contact with the side of the top plate of the moving end of the bending machine; the outer side of the control plate is provided with a limiting groove, which is directly opposite the side of the top plate of the moving end of the bending machine; the moving end of the bending machine is provided with a hook plate for opening and closing; the hook plate is provided with a limiting protrusion that matches the limiting groove; After the hook plate is fixed to the moving end of the bending machine, the limiting protrusion is engaged with the limiting control plate and the top plate of the moving end of the bending machine, and the upper end surface contacts the lower end of the top plate of the moving end of the bending machine.

4. The universal die for arc bending according to claim 2, characterized in that, The mold is cylindrical, and its axis is coplanar with the axis of the force-bearing plate. The mold ring is a cylindrical tube with an opening, and the outer sleeve is inserted into the outer surface of the mold. The force plate passes through the opening of the mold ring.

5. The universal die for arc bending according to claim 4, characterized in that, The mold ring has a force-bearing protrusion at its open end; the force plate has a force-bearing groove corresponding to the force-bearing protrusion; when the mold ring and the deformation strip are pressed against each other, the force-bearing groove limits the displacement of the force-bearing protrusion and controls the deformation of the mold ring under force.

6. The universal die for arc bending according to claim 5, characterized in that, The force-bearing protrusion includes: The connecting part is fixed to the open end of the mold ring at one end, and the other end is partially located in the stress groove, with its surface fitting the stress groove. The insert is located in the stress-bearing groove, and its surface fits into the stress-bearing groove. One end of the insert is fixed to the connecting part. The cross-sectional profile of the insert in the normal direction of the stress-bearing plate is misaligned with the cross-sectional profile of the connecting part in the normal direction of the stress-bearing plate, or the cross-sectional profile of the insert in the normal direction of the stress-bearing plate is larger than the cross-sectional profile of the connecting part in the normal direction of the stress-bearing plate.

7. The universal die for arc bending according to claim 5, characterized in that, The outer contours of the long sides of the force-bearing protrusion shrink as the distance from the end face decreases.

8. The universal die for arc bending according to claim 1, characterized in that, The lower mold frame includes: The clamping part is U-shaped and is fastened to the lower mold base, with its bottom inner surface in contact with the upper surface of the lower mold base; fasteners are provided on the two opposite wing plates of the clamping part to fix the clamping part and the lower mold base respectively. A mold base is disposed on the bottom outer surface of the clamping part; the mold base is provided with a mold groove facing the mold; the mold groove includes a bottom groove and an expansion groove; the bottom groove is U-shaped, and the deformation adjustment component is disposed on the opposite side wall of the bottom groove; the expansion groove is disposed on the opposite side wall of the bottom groove, so that the mold groove is stepped; the deformation strip is disposed at the bottom of the expansion groove.

9. The universal die for arc bending according to claim 8, characterized in that, The deformation adjustment assembly includes two sets of groove width adjustment units respectively disposed on opposite sidewalls of the bottom groove; the groove width adjustment unit includes: Several pads, each with a perforation in the center, are sequentially fitted onto the side wall of the bottom groove, with the upper end flush with the bottom of the groove and the lower end flush with the bottom of the bottom groove. The fixing block has a perforation in the middle and is fitted to the outermost pad surface. Its upper end is flush with the bottom of the expansion groove and its lower end is flush with the bottom of the bottom groove. The upper end surface and the outer surface of the fixing block are rounded. Fixing screws are passed through the holes of the fixing block and several pads in sequence and connected to the side wall of the bottom groove to fix the fixing block and several pads to the bottom groove.

10. The universal die for arc bending according to claim 2, characterized in that, It also includes two side sealing plates; the side sealing plates are fixed to the end face of the force plate, and the side sealing plates limit the position of the mold ring end face; the side sealing plates cover the upper part of the mold and the mold ring, or their outer contour is smaller than the outermost mold ring and larger than the next outermost mold ring.

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