Sheet metal part bending forming tool and forming method

Abstract

The application discloses a sheet metal part bending forming tool and a forming method, and relates to the technical field of sheet metal forming tools, and aims to improve the forming precision and the processing efficiency.

Description

Technical Field

[0001] This invention relates to the field of sheet metal processing technology, and in particular to a sheet metal bending forming tool and forming method. Background Technology

[0002] With the vigorous development of the aviation industry, many parts in the processing and production of aero engines need to be formed by sheet metal. Sheet metal obtained by bending has good surface quality and wide range of applications, and is widely used in the production of sheet metal parts.

[0003] like Figure 1 The sheet metal part shown is generally arc-shaped, with U-shaped edges formed on both sides along its arc direction. Holes are distributed along the arc direction between the two U-shaped edges. This sheet metal part requires high forming precision, is difficult to form, and has low processing efficiency. Therefore, a sheet metal bending forming fixture and forming method are designed to solve the above problems. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a sheet metal bending forming tooling and forming method that is easy to operate, has high forming accuracy, effectively improves processing efficiency, and is suitable for mass production.

[0005] This invention provides a sheet metal bending and forming fixture, comprising:

[0006] The lower template has a first through hole.

[0007] A concave mold is fixedly disposed on the top surface of the lower template, located above the first through hole. The top surface of the concave mold has an annular first mold groove, and the inner diameter of the first through hole is larger than the outer diameter of the first mold groove.

[0008] The upper template is positioned above the cavity mold;

[0009] A guide component is disposed between the lower template and the upper template for alignment and positioning between the upper template and the lower template.

[0010] The first forming component is detachably installed in the first mold groove and the bottom surface of the upper template, and is used to extrude the sheet metal blank so that its two sides are bent upwards by 90 degrees to form a bent edge.

[0011] The second molding component is detachably installed in the first mold groove and on the bottom surface of the upper template. It is used to replace the first molding component and to press the bent edge so that its upper part bends inward by 40-50 degrees to form a bevel.

[0012] A third forming assembly is detachably mounted on the bottom surface of the upper die plate in the first die slot to replace the second forming assembly and extrude the bevel to continue to bend inwardly to form a U-shaped edge.

[0013] A jacking assembly is arranged at the bottom of the die and extends into the first die slot to extrude the first forming assembly, the second forming assembly or the third forming assembly mounted in the first die slot to bend the sheet metal part.

[0014] The third forming assembly includes a third forming ring, a second backing plate and a U-shaped edge bending die.

[0015] The third forming ring is detachably embedded in the first die slot.

[0016] The second backing plate is a circular arc with the same curvature as the sheet metal part and is mounted in the sheet metal blank to support the bottom of the bevel to bend inwardly to the horizontal.

[0017] The U-shaped edge bending die is detachably fixed on the bottom surface of the upper die plate corresponding to the third forming ring by bolts, and a third die slot is arranged on the bottom surface of the U-shaped edge bending die in the circumferential direction. A second top ring is slidably embedded in the third die slot. Second counterbores are symmetrically arranged on both sides of the top of the U-shaped edge bending die and communicate with the third die slot. Second anti-loose bolts are arranged in the second counterbores. The bottom end of the second anti-loose bolt is threadedly connected with the second top ring. A plurality of second Optigel rods are uniformly distributed between the top surface of the second top ring and the third die slot in the circumferential direction to support the second top ring so that the bottom end of the second top ring extends out of the third die slot. The slot opening of the third die slot is symmetrically provided with a second forming groove on both sides of the second top ring to extrude the bevel to bend to the horizontal.

[0018] Further, the die includes a die backing plate and a die insert. The die backing plate is fixedly arranged on the top surface of the lower die plate. The top surface of the die backing plate is provided with an embedding groove. The die insert is arranged in the embedding groove and is fixedly positioned with the die backing plate by at least two first positioning pins. The first die slot is arranged on the top surface of the die insert. The die backing plate is made of 45# steel, and the die insert is made of die steel.

[0019] Further, the lower die plate, the upper die plate, the guide assembly and the jacking assembly are all made of 45# steel.

[0020] Further, the guide assembly includes a plurality of guide columns fixedly arranged on the top surface of the lower die plate outside the die. The bottom surface of the upper die plate is fixedly provided with guide sleeves corresponding to the guide columns. The outer diameter of the guide column is clearance fit with the inner diameter of the guide sleeve.

[0021] Further, the first forming assembly comprises a first forming ring and an annular punch;

[0022] The first forming ring is separably embedded in the first mold groove, and at least two second positioning pins are arranged between the bottom surface of the first forming ring and the first mold groove for angular positioning of the first forming ring. The top surface of the first forming ring is provided with at least two positioning holes corresponding to the forming holes of the sheet metal part, and the bottom end of the third positioning pin is embedded in the corresponding positioning hole through the forming hole of the sheet metal part.

[0023] The punch is detachably fixedly installed on the bottom surface of the upper die plate corresponding to the first forming ring, and the bottom surface of the punch is provided with a clearance hole corresponding to the third positioning pin.

[0024] Further, the second forming assembly comprises a second forming ring, a first backing plate and an annular bevel bending die;

[0025] The second forming ring is separably embedded in the first mold groove;

[0026] The first backing plate is a circular arc with the same curvature as the sheet metal part, and is installed in the sheet metal blank for supporting the lower part of the inner side of the bending edge;

[0027] The bevel bending die is detachably fixedly installed on the bottom surface of the upper die plate corresponding to the second forming ring, and the bottom surface of the bevel bending die is provided with a circle of second mold grooves in the circumferential direction. A first top ring is slidably embedded in the second mold groove. First counterbores are symmetrically arranged on both sides of the top of the bevel bending die and communicate with the second mold groove. First anti-loose bolts are arranged in the first counterbores. The bottom end of the first anti-loose bolt is threadedly connected with the first top ring. A plurality of first super glue sticks are uniformly distributed between the top surface of the first top ring and the second mold groove in the circumferential direction for supporting the first top ring so that the bottom end of the first top ring protrudes out of the second mold groove. The slot opening of the second mold groove is symmetrically provided with a first forming groove on both sides of the first top ring for extruding the bending edge to bend the upper part of the bending edge by 40-50 degrees.

[0028] Further, the jacking assembly comprises a jack, a jack support plate and a limiting ring plate. The limiting ring plate is concentrically fixed to the bottom surface of the lower die plate. The jack support plate is arranged in the first through hole, and the outer diameter of the jack support plate is smaller than the inner diameter of the first through hole and larger than the inner diameter of the limiting ring plate. A plurality of second through holes are uniformly distributed in the circumferential direction of the bottom of the first mold groove and communicate with the first through hole. The second through holes are each provided with the jack, and the bottom end of the jack abuts against the top surface of the jack support plate, and the top end of the jack protrudes into the first mold groove.

[0029] In addition, the application further provides a sheet metal part bending forming method.

[0030] Further, the sheet metal part bending forming method comprises the following steps:

[0031] Machining of the shaped hole: firstly, the shaped hole is machined on the sheet metal blank;

[0032] First bending forming: firstly, the first forming assembly is installed in the first mold groove and the bottom surface of the upper die plate, the lower die plate is fixed on the workbench of the hydraulic machine, the upper die plate is positioned and installed above the concave die through the guide assembly; then the upper die plate is fixedly connected with the bottom of the extension end of the main cylinder of the hydraulic machine, the upper die plate is lifted by the main cylinder, the first forming assembly in the first mold groove is lifted by the bottom of the top lifting assembly through the auxiliary cylinder of the hydraulic machine, so that the first forming assembly in the first mold groove is flush with the first mold groove; then the sheet metal blank is positioned and installed on the top surface of the first forming assembly in the first mold groove through the shaped hole, and the sheet metal blank is embedded into the first mold groove by the first forming assembly in the first mold groove and the first forming assembly on the bottom surface of the upper die plate under the guidance of the guide assembly, so that the both sides of the sheet metal blank are bent upward by 90 degrees to form a bending edge;

[0033] Second bending forming: firstly, the main cylinder is controlled to rise, the sheet metal blank is taken down, and the first forming assembly is replaced by the second forming assembly; then the sheet metal blank is placed in the first mold groove, the depth of the sheet metal blank embedded into the first mold groove is adjusted through the top lifting assembly, so that the upper part of the bending edge to be bent is exposed from the first mold groove; then the upper die plate is pressed down by the main cylinder, so that the second forming assembly on the bottom surface of the upper die plate and the second forming assembly in the first mold groove first clamp the sheet metal blank, and then the upper part of the bending edge is bent inward by 40-50 degrees to form a bevel edge;

[0034] Third bending forming: firstly, the main cylinder is controlled to rise, the sheet metal blank is taken down, and the second forming assembly is replaced by the third forming assembly; then the sheet metal blank is placed in the first mold groove, the upper die plate is pressed down by the main cylinder, so that the third forming assembly on the bottom surface of the upper die plate abuts against the first mold groove; then the third forming assembly in the first mold groove is lifted by the auxiliary cylinder through the top lifting assembly, the bevel edge is continuously bent inward to form a U-shaped edge through the third forming assembly in the first mold groove and the third forming assembly on the bottom surface of the upper die plate, and the bending forming of the sheet metal part is completed.

[0035] Compared with the prior art, the application has the following beneficial effects:

[0036] The forming tool of the present application performs first bending forming on the sheet metal blank through the first forming assembly, performs second bending forming on the sheet metal blank through the second forming assembly, and performs third bending forming on the sheet metal blank through the third forming assembly, so as to complete the processing of the sheet metal part. After the hole forming is completed, the sheet metal blank is positioned through the hole, and then the bending treatment is performed, so as to ensure the positional accuracy between structures, and the operation is convenient, the forming precision is high, the processing efficiency is effectively improved, and the present application is suitable for batch production.

[0037] It should be understood that the content described in the summary section is not intended to limit the key or important features of the embodiments of the present application, nor to limit the scope of the present application. Other features of the present application will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0038] Other features, objects, and advantages of the present application will become more apparent through reading the detailed description of the non-limiting embodiments made with reference to the following drawings:

[0039] Figure 1 is a structural schematic view of a sheet metal part;

[0040] Figure 2 is a sectional structural schematic view of a sheet metal part;

[0041] Figure 3 is a sectional structural schematic view of the sheet metal blank after first bending;

[0042] Figure 4 is a sectional structural schematic view of the sheet metal blank after second bending;

[0043] Figure 5 is a structural schematic view of a forming tool;

[0044] Figure 6 is a structural schematic view of a lower die plate;

[0045] Figure 7 is a structural schematic view of a concave die;

[0046] Figure 8 is a structural schematic view of an upper die plate;

[0047] Figure 9 is a structural schematic view of a first forming assembly;

[0048] Figure 10 is a sectional structural schematic view of the forming tool with the first forming assembly installed;

[0049] Figure 11 is a sectional structural schematic view of the forming tool with the first forming assembly installed; Figure 10 is an enlarged structural schematic view of position A in FIG. 8;

[0050] Figure 12Schematic diagram of cross-sectional structure of the second forming assembly installed on the forming tooling;

[0051] Figure 13 For Figure 12 Schematic diagram of enlarged structure at B in the middle;

[0052] Figure 14 Schematic diagram of cross-sectional structure of the third forming assembly installed on the forming tooling;

[0053] Figure 15 For Figure 14 Schematic diagram of enlarged structure at C in the middle;

[0054] Figure 16 Schematic diagram of cross-sectional structure of the jacking assembly.

[0055] Reference numerals in the figure: 1, sheet metal part; 2, lower die plate; 3, concave die; 4, upper die plate; 5, guide assembly; 6, first forming assembly; 7, second forming assembly; 8, third forming assembly; 9, jacking assembly;

[0056] 11, U-shaped edge; 12, shaped hole; 13, sheet metal blank; 14, bent edge; 15, bevel;

[0057] 21, first through hole;

[0058] 31, first die groove; 32, concave die backing plate; 33, concave die insert; 34, embedding groove; 35, first positioning pin; 36, second through hole;

[0059] 51, guide column; 52, guide sleeve;

[0060] 61, first forming ring; 62, convex die; 63, second positioning pin; 64, positioning hole; 65, third positioning pin; 66, avoidance hole;

[0061] 71, second forming ring; 72, first backing plate; 73, bevel bending die; 74, second die groove; 75, first top ring; 76, first counterbore; 77, first anti-loose bolt; 78, first Loctite stick; 79, first forming groove;

[0062] 81, third forming ring; 82, second backing plate; 83, U-shaped edge bending die; 84, third die groove; 85, second top ring; 86, second counterbore; 87, second anti-loose bolt; 88, second Loctite stick; 89, second forming groove;

[0063] 91, jacking column; 92, jacking column backing plate; 93, limiting ring plate. DETAILED DESCRIPTION

[0064] The application will be described in further detail below with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not intended to limit the scope of the application. In addition, it should be noted that, for the purpose of clarity, only those parts of the drawings that are relevant to the application are shown.

[0065] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict. The application will be described in further detail below with reference to the drawings and embodiments.

[0066] Reference will be made to Figures 1 to 16 The embodiment of the application provides a sheet metal part bending forming tool, which comprises:

[0067] A lower die plate 2 is provided with a first through hole 21;

[0068] A concave die 3 is fixedly arranged on the top surface of the lower die plate 2 and located above the first through hole 21. The top surface of the concave die 3 is provided with an annular first die groove 31. The inner diameter of the first through hole 21 is greater than the outer diameter of the first die groove 31.

[0069] An upper die plate 4 is arranged above the concave die 3;

[0070] A guide assembly 5 is arranged between the lower die plate 2 and the upper die plate 4 and is used for alignment and positioning between the upper die plate 4 and the lower die plate 2;

[0071] A first forming assembly 6 is detachably arranged in the first die groove 31 and the bottom surface of the upper die plate 4 and is used for extruding the sheet metal blank 13 to make both sides thereof bend 90 degrees upward to form a bent edge 14;

[0072] A second forming assembly 7 is detachably arranged in the first die groove 31 and the bottom surface of the upper die plate 4 and is used for replacing the first forming assembly 6 and extruding the bent edge 14 to make the upper part thereof bend 40-50 degrees inward to form a beveled edge 15;

[0073] A third forming assembly 8 is detachably arranged in the first die groove 31 and the bottom surface of the upper die plate 4 and is used for replacing the second forming assembly 7 and extruding the beveled edge 15 to make the beveled edge 15 continue to bend inward to a horizontal U-shaped edge 11;

[0074] A jacking assembly 9 is arranged at the bottom of the concave die 3 and extends into the first die groove 31 and is used for extruding the first forming assembly 6, the second forming assembly 7 or the third forming assembly 8 arranged in the first die groove 31 to make the sheet metal part 1 bend and form.

[0075] In the embodiment, as Figure 1 and Figure 2When the sheet metal part 1 is bent and formed, first, the sheet metal blank 13 is machined to form the shaped hole 12. Then the sheet metal blank 13 is positioned and installed with the first forming assembly 6 through the shaped hole 12, and the sheet metal blank 13 is first bent and formed by the first forming assembly 6 to form the bent edges 14 by bending the two sides 90 degrees upward. Then the first forming assembly 6 is removed and replaced by the second forming assembly 7, and the bent edges 14 are pressed and bent by the second forming assembly 7 to form the bevels 15 by bending the upper part 40-50 degrees inward. Then the second forming assembly 7 is removed and replaced by the third forming assembly 8, and the bevels 15 are pressed and bent by the third forming assembly 8 to form the U-shaped edges 11 by bending inward to the horizontal, and the bending and forming of the sheet metal part 1 is completed.

[0076] The forming tool of the present application is convenient to operate, has high forming precision, and effectively improves the processing efficiency, and is suitable for batch production.

[0077] In a preferred embodiment, as shown in Figure 7 and Figure 10 The recess die 3 includes a recess die backing plate 32 and a recess die insert 33. The recess die backing plate 32 is fixedly arranged on the top surface of the lower die plate 2. The top surface of the recess die backing plate 32 is provided with an embedding groove 34. The recess die insert 33 is arranged in the embedding groove 34 and is fixedly positioned with the recess die backing plate 32 by at least two first positioning pins 35. The first die groove 31 is arranged on the top surface of the recess die insert 33. The recess die backing plate 32 is made of 45# steel, and the recess die insert 33 is made of die steel.

[0078] In the embodiment, the recess die 3 is assembled by the recess die backing plate 32 and the recess die insert 33. The recess die insert 33 in which the first die groove 31 is arranged is made of die steel, and the recess die backing plate 32 is made of 45# steel. In the case of ensuring the performance of the forming tool, the manufacturing cost of the forming tool is reduced.

[0079] In a preferred embodiment, the lower die plate 2, the upper die plate 4, the guide assembly 5, and the jacking assembly 9 are all made of 45# steel, which has a structure strength that can meet the production requirements and a relatively low manufacturing cost.

[0080] In a preferred embodiment, as shown in Figure 5 and Figure 10 The guide assembly 5 includes a plurality of guide columns 51 fixedly arranged on the top surface of the lower die plate 2 outside the periphery of the recess die 3. The bottom surface of the upper die plate 4 is fixedly provided with guide sleeves 52 corresponding to the guide columns 51 one by one. The outer diameter of the guide column 51 and the inner diameter of the guide sleeve 52 are gap-fitted. The positioning between the upper die plate 4 and the lower die plate 2 is realized by the cooperation of the guide column 51 and the guide sleeve 52, that is, the positioning and alignment between the components of the first forming assembly 6, the positioning and alignment between the components of the second forming assembly 7, and the positioning and alignment between the components of the third forming assembly 8 are realized, and the machining precision of the sheet metal part 1 is ensured.

[0081] In a preferred embodiment, as shown in Figures 8 to 11 The first forming assembly 6 comprises a first forming ring 61 and a ring-shaped punch 62.

[0082] The first forming ring 61 is detachably embedded in the first die groove 31, and at least two second positioning pins 63 are arranged between the bottom surface of the first forming ring 61 and the first die groove 31 for angular positioning of the first forming ring 61. The top surface of the first forming ring 61 is provided with at least two positioning holes 64 corresponding to the forming holes 12 of the sheet metal part 1, and the bottom end of the third positioning pin 65 is embedded in the corresponding positioning hole 64 through the forming hole 12 of the sheet metal part 1.

[0083] The punch 62 is detachably fixedly installed on the bottom surface of the upper die plate 4 corresponding to the first forming ring 61, and the bottom surface of the punch 62 is provided with a relief hole 66 corresponding to the third positioning pin 65.

[0084] In this embodiment, when the sheet metal part 1 as shown in Figure 1 and Figure 2 is subjected to bending forming, the first forming ring 61 is first embedded in the first die groove 31, and the punch 62 is fixedly installed on the bottom surface of the upper die plate 4. The angular position of the first forming ring 61 is positioned by the second positioning pin 63 to ensure that the positioning hole 64 is aligned with the relief hole 66. Then the first forming ring 61 is lifted by the jacking assembly 9 so that its top surface is flush with the top of the first die groove 31.

[0085] At this time, the sheet metal blank 13 is positioned and installed on the top surface of the first forming ring 61 by the third positioning pin 65. Then the punch 62 is pressed down together with the upper die plate 4, and the punch 62 and the first forming ring 61 first clamp the sheet metal blank 13, which can effectively prevent the deformation of the forming hole 12. The punch 62 and the first forming ring 61 drive the sheet metal blank 13 to be embedded in the first die groove 31, so that the two sides of the sheet metal blank 13 are bent upward by 90 degrees to form a bent edge 14, completing the first bending forming, as shown in Figure 3 After the punch 62 is lifted with the upper die plate 4, the first forming ring 61 is lifted by the jacking assembly 9 to complete the automatic ejection of the sheet metal blank 13. The operation is convenient and the forming effect is good.

[0086] In a preferred embodiment, as shown in Figure 12 and Figure 13 The second forming assembly 7 comprises a second forming ring 71, a first backing plate 72 and a ring-shaped bevel bending die 73.

[0087] The second forming ring 71 is detachably embedded in the first die groove 31.

[0088] The first backing plate 72 is a circular arc with the same curvature as the sheet metal part 1, and is installed in the sheet metal blank 13 for supporting the lower part of the inner side of the bent edge 14.

[0089] The bevel bending die 73 is detachably fixed to the bottom surface of the upper template 4 via bolts, corresponding to the second forming ring 71. A second mold groove 74 is provided around the bottom surface of the bevel bending die 73. A first top ring 75 is slidably embedded in the second mold groove 74. First countersunk holes 76 are symmetrically provided on both sides of the top of the bevel bending die 73, which are connected to the second mold groove 74. A first anti-detachment bolt 77 is provided in the first countersunk hole 76. The bottom end of the first anti-detachment bolt 77 is threadedly connected to the first top ring 75. Several first urethane rods 78 are evenly distributed around the top surface of the first top ring 75 and the second mold groove 74 to support the first top ring 75 so that its bottom end extends out of the second mold groove 74. The opening of the second mold groove 74 is located on both sides of the first top ring 75 and is symmetrically provided with first forming grooves 79 to compress the bending edge 14 so that its upper part bends inward by 40-50 degrees.

[0090] In this embodiment, for example Figure 3 When the sheet metal blank 13 shown is bent and formed for the second time, the first forming component 6 is first removed, the second forming ring 71 is then embedded into the first mold groove 31, and the inclined bending mold 73 is fixedly installed on the bottom surface of the upper template 4; the first top ring 75 is suspended in the second mold groove 74 by the first anti-detachment bolt 77 to prevent the first top ring 75 from falling off, and without affecting the up and down sliding of the first top ring 75.

[0091] Then, the first pad 72 is embedded into the sheet metal blank 13 to support the lower part of the inner side of the bent edge 14, preventing the lower part from bending inward along with the upper part. At this time, the sheet metal blank 13 and the first pad 72 are embedded together into the first mold groove 31 and placed on the second forming ring 71, with the upper part of the bent edge 14 exposed outside the first mold groove 31. Then, the upper template 4 drives the inclined bending mold 73 to slowly press down together. First, the first top ring 75 abuts against the first pad 72, pressing the sheet metal blank 13 tightly through the first pad 72, so that the sheet metal blank 13 will not deform during the bending process. As the upper template 4 presses down, the first top ring 75 squeezes the first urethane stick 78, causing the first urethane stick 78 to undergo elastic deformation. The first top ring 75 retracts into the second mold groove 74, and the first forming groove 79 squeezes the bent edge 14 exposed outside the first mold groove 31, causing it to bend inward by 40-50 degrees, completing the second bending process. Figure 4 As shown, after the bevel bending die 73 is lifted along with the upper template 4, the lifting component 9 lifts the second forming ring 71, completing the automatic demolding of the sheet metal blank 13. The operation is convenient and the forming effect is good.

[0092] In a preferred embodiment, such as Figure 14 and Figure 15 As shown, the third forming component 8 includes a third forming ring 81, a second pad 82, and an annular U-shaped edge bending mold 83;

[0093] The third molding ring 81 can be separably embedded into the first mold groove 31;

[0094] The second backing plate 82 is a circular arc with the same curvature as the sheet metal piece 1, is installed in the sheet metal blank 13, and is used to support the bottom of the bevel 15 to bend it to the horizontal at most to the inside;

[0095] The U-shaped edge bending die 83 is detachably fixed to the bottom surface of the upper die plate 4 through the third forming ring 81 by bolts, the bottom surface of the U-shaped edge bending die 83 is provided with a circle of third die grooves 84 in the circumferential direction, the second top ring 85 is slidably embedded in the third die groove 84, the second counterbores 86 that communicate with the third die groove 84 are symmetrically arranged on both sides of the top of the U-shaped edge bending die 83, the second anti-loosening bolts 87 are arranged in the second counterbores 86, the bottom end of the second anti-loosening bolt 87 is threadedly connected with the second top ring 85, and the second top ring 85 is supported by the second Opta glue sticks 88 that are uniformly distributed in the circumferential direction between the top surface of the second top ring 85 and the third die groove 84 so that the bottom end of the second top ring 85 protrudes out of the third die groove 84, and the second forming grooves 89 are symmetrically arranged on both sides of the second top ring 85 at the slot opening of the third die groove 84 and are used to extrude the bevel 15 to bend it to the horizontal.

[0096] In this embodiment, the sheet metal blank 13 shown in FIG. 1 is bent and formed for the third time as follows. Figure 4 First, the second forming assembly 7 is removed, the third forming ring 81 is embedded in the first die groove 31, and the U-shaped edge bending die 83 is fixedly installed on the bottom surface of the upper die plate 4.

[0097] Then, the first backing plate 72 is taken out of the sheet metal blank 13, the second backing plate 82 is embedded in the sheet metal blank 13, and the bottom of the bevel 15 is supported to bend it to the horizontal at most. The width of the second backing plate 82 is smaller than that of the first backing plate 72, the second backing plate 82 does not need to support both sides, only needs to support the bevel above it, and the second backing plate 82 with a smaller width is easier to be taken out after the sheet metal piece 1 is formed. Then, the sheet metal blank 13 and the second backing plate 82 are embedded in the first die groove 31 and placed on the third forming ring 81, the third forming ring 81 is the same in structure as the second forming ring 71 and can be the same one.

[0098] Then, the upper die plate 4 drives the U-shaped edge bending die 83 to move downward to abut against the top of the first die groove 31, at this time, the second top ring 85 abuts against the second backing plate 82, the sheet metal blank 13 is pressed tightly by the second backing plate 82, and the sheet metal blank 13 will not be deformed in the process of bending and forming.

[0099] With the third forming ring 81 rising, the second pad plate 82 extrudes the second top ring 85, the second top ring 85 extrudes the second super glue stick 88, the second super glue stick 88 elastically deforms, the second top ring 85 is retracted into the third mold groove 84, and the sheet metal blank 13 is embedded into the second forming groove 89 to extrude the bevel 15, so that the bevel 15 is bent inward to be horizontal, and the third bending forming is completed. Figure 2

[0100] After the U-shaped edge bending mold 83 is lifted with the upper mold plate 4, the second top ring 85 is pushed out under the elastic force of the second super glue stick 88, the second top ring 85 pushes out the sheet metal part 1 from the second forming groove 89, and the automatic mold stripping of the sheet metal part 1 is completed. The operation is convenient, and the forming effect is good.

[0101] In a preferred embodiment, as shown in Figure 10 and Figure 16 The lifting assembly 9 includes a lifting column 91, a lifting column support plate 92 and a limiting ring plate 93; the limiting ring plate 93 is fixedly arranged on the bottom surface of the lower mold plate 2 concentrically with the first through hole 21; the lifting column support plate 92 is arranged in the first through hole 21, and the outer diameter of the lifting column support plate 92 is smaller than the inner diameter of the first through hole 21 and larger than the inner diameter of the limiting ring plate 93; the bottom of the first mold groove 31 is circumferentially uniformly distributed with a plurality of second through holes 36 communicated to the first through hole 21; the lifting column 91 is arranged in the second through hole 36, and the bottom end of the lifting column 91 abuts against the top surface of the lifting column support plate 92, and the top end of the lifting column 91 extends into the first mold groove 31.

[0102] In the embodiment, the lifting column support plate 92 is limited in the first through hole 21 by the limiting action of the limiting ring plate 93, all the lifting columns 91 can be lifted by extruding the bottom of the lifting column support plate 92, and then the first forming ring 61, the second forming ring 71 or the third forming ring 81 installed in the first mold groove 31 is lifted to realize the bending forming of the sheet metal part 1. The structure design is reasonable, the operation is convenient, and the forming quality of the sheet metal part 1 is ensured.

[0103] In addition, the embodiment of the present application also provides a sheet metal part bending forming method, which is a method for bending forming the sheet metal part 1 by using the above forming tool, and includes the following steps:

[0104] Machining of the shaped hole 12: first, the shaped hole 12 is machined on the sheet metal blank 13;

[0105] ​First bending forming: first, install the first forming assembly 6 in the first mold groove 31 and the bottom surface of the upper die plate 4, fix the lower die plate 2 on the workbench of the hydraulic machine, position and install the upper die plate 4 above the concave die 3 through the guide assembly 5; then fix the upper die plate 4 with the bottom of the extension end of the main cylinder of the hydraulic machine, drive the upper die plate 4 to rise through the main cylinder, and make the first forming assembly 6 in the first mold groove 31 be lifted up to the level of the first mold groove 31 by the bottom of the jacking assembly 9 against the vice cylinder; then position and install the sheet metal blank 13 in the first forming assembly 6 in the first mold groove 31 through the mold hole 12, and drive the sheet metal blank 13 to be embedded in the first mold groove 31 by driving the upper die plate 4 to press down through the main cylinder, so that the sheet metal blank 13 is clamped by the first forming assembly 6 on the bottom surface of the upper die plate 4 and the first forming assembly 6 in the first mold groove 31, and the two sides of the sheet metal blank 13 are bent 90 degrees upward to form the bent edge 14;

[0106] Second bending forming: first, control the main cylinder to rise, take down the sheet metal blank 13, and replace the first forming assembly 6 with the second forming assembly 7; then place the sheet metal blank 13 in the first mold groove 31, adjust the depth of the sheet metal blank 13 embedded in the first mold groove 31 through the jacking assembly 9, so that the upper part of the bent edge 14 to be bent is exposed from the first mold groove 31; then drive the upper die plate 4 to press down through the main cylinder, so that the second forming assembly 7 on the bottom surface of the upper die plate 4 and the second forming assembly 7 in the first mold groove 31 first clamp the sheet metal blank 13, and then bend the upper part of the bent edge 14 inward by 40-50 degrees to form the beveled edge 15;

[0107] Third bending forming: first, control the main cylinder to rise, take down the sheet metal blank 13, and replace the second forming assembly 7 with the third forming assembly 8; then place the sheet metal blank 13 in the first mold groove 31, drive the upper die plate 4 to press down through the main cylinder, so that the third forming assembly 8 on the bottom surface of the upper die plate 4 is against the first mold groove 31; then the vice cylinder lifts up the third forming assembly 8 in the first mold groove 31 through the jacking assembly 9, and the third forming assembly 8 in the first mold groove 31 and the third forming assembly 8 on the bottom surface of the upper die plate 4 continue to bend the beveled edge 15 inward to the horizontal to form the U-shaped edge 11, completing the bending forming of the sheet metal part 1.

[0108] In this embodiment, the U-shaped edge 11 is gradually bent and formed through three times of bending forming, which avoids the problem of high scrap rate caused by too large bending amount at one time, greatly improves the yield of the sheet metal part 1, has good forming quality, is convenient to operate, has high forming efficiency, and is suitable for batch production.

[0109] In the description of the present specification, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0110] In the description of the present specification, the description of the terms "one embodiment", "some embodiments" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0111] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A sheet metal bending forming fixture, characterized in that, The utility model relates to a metal sheet bending device, which comprises the following parts: a lower die plate, a first through hole arranged on the upper surface of the lower die plate; a concave die fixedly arranged on the top surface of the lower die plate and located above the first through hole, the top surface of the concave die being provided with an annular first die groove, the inner diameter of the first through hole being larger than the outer diameter of the first die groove; an upper die plate arranged above the concave die; a guide assembly arranged between the lower die plate and the upper die plate for alignment and positioning between the lower die plate and the upper die plate; a first forming assembly detachably mounted in the first die groove and on the bottom surface of the upper die plate for extruding a metal sheet blank to bend the two sides of the metal sheet blank by 90 degrees to form bent edges; a second forming assembly detachably mounted in the first die groove and on the bottom surface of the upper die plate for replacing the first forming assembly and extruding the bent edges to bend the upper part of the bent edges by 40-50 degrees to form bevels; a third forming assembly detachably mounted in the first die groove and on the bottom surface of the upper die plate for replacing the second forming assembly and extruding the bevels to further bend the bevels to the horizontal to form U-shaped edges; a jacking assembly arranged at the bottom of the concave die and extending into the first die groove for extruding the first forming assembly, the second forming assembly or the third forming assembly mounted in the first die groove to bend and form the metal sheet part; wherein the third forming assembly comprises a third forming ring, a second backing plate and an annular U-shaped edge bending die; the third forming ring is separably embedded in the first die groove; the second backing plate is a circular arc with the same curvature as the metal sheet part and is mounted in the metal sheet blank for supporting the bottom of the bevels to bend the bevels to the horizontal at most; the U-shaped edge bending die is detachably fixedly mounted on the bottom surface of the upper die plate corresponding to the third forming ring, the bottom surface of the U-shaped edge bending die is provided with a circle of third die grooves in the circumferential direction, a second top ring is slidably embedded in the third die grooves, second blind holes communicating with the third die grooves are symmetrically arranged on both sides of the top of the U-shaped edge bending die, a second anti-loosening bolt is arranged in the second blind hole, the bottom end of the second anti-loosening bolt is threadedly connected with the second top ring, a plurality of second Optigel rods are uniformly distributed in the circumferential direction between the top surface of the second top ring and the third die grooves for supporting the second top ring to make the bottom end of the second top ring extend out of the third die grooves, second forming grooves are symmetrically arranged on both sides of the third die grooves for extruding the bevels to bend them to the horizontal.

2. The press brake tooling assembly of claim 1, wherein: The concave die comprises a concave die backing plate and a concave die insert, the concave die backing plate is fixedly arranged on the top surface of the lower die plate, the top surface of the concave die backing plate is provided with an embedding groove, the concave die insert is arranged in the embedding groove and is fixedly positioned with the concave die backing plate by at least two first positioning pins, the first die groove is arranged on the top surface of the concave die insert, the concave die backing plate is made of 45# steel, and the concave die insert is made of die steel.

3. The press brake tooling assembly of claim 1, wherein: The lower die plate, the upper die plate, the guide assembly and the jacking assembly are all made of 45# steel.

4. The press brake tooling assembly of claim 1, wherein: The guide assembly comprises a plurality of guide columns fixedly arranged on the top surface of the lower die plate outside the periphery of the die; the bottom surface of the upper die plate is fixedly provided with guide sleeves corresponding to the guide columns; the outer diameter of the guide columns is in clearance fit with the inner diameter of the guide sleeves.

5. The press brake tooling assembly of claim 1, wherein: The first forming assembly comprises a first forming ring and an annular punch; The first forming ring is separably embedded in the first die groove; the bottom surface of the first forming ring is provided with at least two second positioning pins between the first die groove, for angular positioning of the first forming ring; the top surface of the first forming ring is provided with at least two positioning holes corresponding to the mold holes of the sheet metal part; the bottom end of the third positioning pin passes through the mold hole of the sheet metal part and is embedded in the corresponding positioning hole. The punch is detachably fixedly installed on the bottom surface of the upper die plate corresponding to the first forming ring by bolts; the bottom surface of the punch is provided with a clearance hole corresponding to the third positioning pin.

6. The press brake tooling assembly of claim 1, wherein: The second forming assembly comprises a second forming ring, a first backing plate and an annular bevel bending die; The second forming ring is separably embedded in the first die groove; The first backing plate is a circular arc with the same curvature as the sheet metal part, and is installed in the sheet metal blank to support the lower part of the inner side of the bending edge; The bevel bending die is detachably fixedly installed on the bottom surface of the upper die plate corresponding to the second forming ring by bolts; the bottom surface of the bevel bending die is provided with a ring of second die grooves in the circumferential direction; a first top ring is slidably embedded in the second die groove; first counterbores are symmetrically provided on both sides of the top of the bevel bending die and communicate with the second die groove; first anti-loose bolts are arranged in the first counterbores; the bottom end of the first anti-loose bolt is threadedly connected with the first top ring; a plurality of first super-strong glue sticks are uniformly distributed between the top surface of the first top ring and the second die groove in the circumferential direction, for supporting the first top ring so that the bottom end of the first top ring protrudes out of the second die groove; first forming grooves are symmetrically provided on both sides of the slot opening of the second die groove, for extruding the bending edge to bend the upper part of the bending edge by 40-50 degrees.

7. The press brake tooling assembly of claim 1, wherein: The lifting assembly comprises a lifting column, a lifting column support plate and a limiting ring plate; the limiting ring plate is concentric with the first through hole and is fixedly arranged on the bottom surface of the lower die plate; the lifting column support plate is arranged in the first through hole, and the outer diameter of the lifting column support plate is smaller than the inner diameter of the first through hole and larger than the inner diameter of the limiting ring plate; the bottom of the first die groove is uniformly provided with a plurality of second through holes in the circumferential direction, which communicate with the first through hole; the second through holes are all provided with the lifting column, and the bottom end of the lifting column abuts against the top surface of the lifting column support plate, and the top end of the lifting column protrudes into the first die groove.

8. A method of bending a sheet metal part, characterized by, The forming method is a method for bending forming a sheet metal part by using the forming tooling of any one of claims 1-7.

9. The method of claim 8, wherein The method comprises the following steps: Mold hole machining: first, the mold hole is machined on the sheet metal blank; First bending forming: first, install the first forming assembly in the first mold groove and the bottom surface of the upper die plate, fix the lower die plate on the workbench of the hydraulic machine, position and install the upper die plate above the concave die through the guide assembly; then fix and connect the upper die plate with the bottom of the extension end of the main cylinder of the hydraulic machine, drive the upper die plate to rise through the main cylinder, and make the first forming assembly in the first mold groove level with the first mold groove by resisting the bottom of the jacking assembly through the auxiliary cylinder of the hydraulic machine; then position and install the sheet metal blank through the mold hole on the top surface of the first forming assembly in the first mold groove, and drive the upper die plate to press down through the main cylinder, and clamp the sheet metal blank through the first forming assembly on the bottom surface of the upper die plate and the first forming assembly in the first mold groove under the guidance of the guide assembly, and drive the sheet metal blank to embed into the first mold groove, so that the two sides of the sheet metal blank are bent upward by 90 degrees to form the bending edge; Second bending forming: first, control the main cylinder to rise, take down the sheet metal blank, and replace the first forming assembly with the second forming assembly; then place the sheet metal blank in the first mold groove, adjust the depth of the sheet metal blank embedded in the first mold groove through the jacking assembly, so that the upper part of the bending edge to be bent is exposed from the first mold groove; then drive the upper die plate to press down through the main cylinder, so that the second forming assembly on the bottom surface of the upper die plate and the second forming assembly in the first mold groove first clamp the sheet metal blank, and then bend the upper part of the bending edge inward by 40-50 degrees to form the bevel edge; Third bending forming: first, control the main cylinder to rise, take down the sheet metal blank, and replace the second forming assembly with the third forming assembly; then place the sheet metal blank in the first mold groove, drive the upper die plate to press down through the main cylinder, so that the third forming assembly on the bottom surface of the upper die plate abuts against the first mold groove; then the auxiliary cylinder jacks up the third forming assembly in the first mold groove through the jacking assembly, and continues to bend the bevel edge inward through the third forming assembly in the first mold groove and the third forming assembly on the bottom surface of the upper die plate to form a U-shaped edge, completing the bending forming of the sheet metal part.

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