Metal plate flange arc forming die

Abstract

The technical scheme belongs to the technical field of sheet metal machining equipment, and particularly relates to a sheet metal flange arc forming die which comprises an upper die device, a lower die device, a lower die device and a die pressing device, and the upper die device comprises an upper die base and an upper die seat with an upper die cambered surface; the middle mold device comprises a middle mold base and a middle mold base, and a plate turning mechanism matched with the middle mold base in position is arranged on the middle mold base in a hinged mode; the lower die device comprises a lower die base and a lower die seat with a lower die cambered surface; wherein the middle die base is movably arranged on the lower die base; after mold closing, the middle mold base is matched with the upper mold base to clamp a main body part of a workpiece, the end face of a plate turning piece of the plate turning mechanism abuts against the lower mold base, and when the upper mold base and the middle mold base continue to drive the plate turning piece to move in the mold closing direction, the end, away from the middle mold base, of the plate turning piece is blocked by the lower mold base so that the plate turning piece can rotate; therefore, the first molding of the bent arc part of the workpiece is realized; and along with the continuous movement of the upper mold base and the middle mold base, the upper mold arc surface is matched with the lower mold arc surface to realize secondary molding of the bent arc part of the workpiece.

Description

Technical Field

[0001] The present invention relates to the technical field of sheet metal processing equipment, and in particular to a sheet metal flange arc forming die. Background Art

[0002] Sheet metal bending is a processing technology that uses special equipment to apply pressure to metal sheets to cause them to undergo plastic deformation and form a specific angle. The traditional bending process is to manufacture a mold of a specific shape, place the workpiece in the mold cavity, move the movable mold toward the fixed mold, and cooperate with the fixed mold to stamp the workpiece. During the stamping process, the workpiece is close to the inner wall of the cavity to achieve bending. However, this bending process has no buffering process, which makes it difficult for the appearance and quality of the workpiece to meet the requirements. At the same time, this bending process is also accompanied by problems such as metal springback, dimensional instability, low production efficiency, and low part qualification rate.

[0003] The existing bending process has the following disadvantages:

[0004] 1. The flange arc forming process of sheet metal is one of the workpiece bending processes, as shown in the attached manual. Figure 1 As shown, the unprocessed state of the sheet metal has a bottom surface and side surfaces that are perpendicular to each other. The flange arc forming process of the sheet metal refers to the process of bending the bottom surface and side surfaces at the same time to form an arc when processing this sheet metal. When bending the bottom surface of the sheet metal, you only need to apply force to bend it, and when bending the side surface of the sheet metal, the side surface of the sheet metal will be stretched. During the stretching process, if there is no buffer, it will cause a series of problems such as cracking of the sheet metal and unstable size. At the same time, if the side surface of the sheet metal is subjected to other external forces, it will be deformed, resulting in poor product quality. Therefore, the traditional sheet metal flange arc forming process cannot guarantee production needs.

[0005] 2. Due to the rebound characteristics of metal materials, stress changes will occur inside the metal during the bending process. When the external force is removed, the metal material will recover due to elastic deformation and rebound. This will cause the product to be unable to reach the predetermined bending angle, and the bending angle will be slightly smaller than the predetermined bending angle. At the same time, this bending process is difficult to meet the requirements for angle accuracy, affecting product quality and performance. Summary of the Invention

[0006] The purpose of this technical solution is to provide a sheet metal flange arc forming die, which cooperates with the upper die base to shape the workpiece for the first time when the flap rotates, and then cooperates with the upper die base to shape the workpiece for the second time, so as to solve the problems of arc cracking and low quality of workpieces processed by the original production equipment.

[0007] The purpose of this technical solution is achieved in this way:

[0008] A sheet metal flange arc forming die, comprising: an upper die device, comprising an upper die base and an upper die seat arranged on the upper die base, the upper die seat having an upper die arc surface for processing a workpiece; a middle die device, comprising a middle die base and a middle die seat arranged on the middle die base, the middle die base being hingedly provided with a flip mechanism adapted to the position of the middle die seat; and a lower die device, comprising a lower die base and a lower die seat arranged on the lower die base, the lower die seat having a lower die arc surface adapted to the upper die arc surface; wherein the middle die base is movably arranged on the lower die base; after the mold is closed, the middle die seat cooperates with the upper die seat to clamp the main body of the workpiece, and the end face of the flip member of the flip mechanism abuts against the upper die seat. On the lower die base, when the upper die base and the middle die base continue to drive the flip part to move along the mold closing direction, the end of the flip part away from the middle die base is blocked by the lower die base, causing the flip part to rotate, thereby realizing the first shaping of the bent arc portion of the workpiece; as the upper die base and the middle die base continue to move, the upper die arc surface cooperates with the lower die arc surface to realize the second shaping of the bent arc portion of the workpiece; an arc-shaped convex portion is provided on the inner side wall of the flip part, which movably abuts the lower die base, and when the middle die base drives the flip part to move to the set position, the lower die base acts on the inner side wall of the flip part through the arc-shaped convex portion, causing the flip part to rotate, thereby realizing the third shaping of the workpiece.

[0009] Preferably, the mold further includes a propulsion mechanism, which is used to drive the lower mold base to move toward the upper mold base, thereby achieving the cooperation between the upper mold arc surface and the lower mold arc surface to process the bending arc portion of the workpiece.

[0010] Preferably, the propulsion mechanism includes a propulsion portion arranged on the upper mold base, the propulsion portion has a slope one, and the lower mold base has a slope two adapted to the slope one; when the propulsion portion moves toward the lower mold base, under the action of the slope one and the slope two, the lower mold base moves toward the upper mold base.

[0011] Preferably, the flip mechanism includes: a flip mounting seat, which is arranged on the middle mold base; a flip mounting frame, which is hinged on the flip mounting seat; a flip member, which is arranged on the flip mounting frame and has a contact surface that abuts the workpiece; and a flip tension spring, one end of which is arranged on the lower mold base and the other end is arranged on the flip mounting frame.

[0012] Preferably, a mounting portion is provided on the lower die base, a roller is rotatably provided on the mounting portion, and the roller movably abuts against the end surface of the flap member.

[0013] Preferably, the propulsion mechanism also includes a reset assembly arranged on the lower mold base, which includes: a reset seat, which is arranged on the lower mold base; a reset pin, which is movably arranged in the reset seat and passes through the reset seat to be connected with the lower mold base; a reset baffle, which is arranged on the reset pin; and a reset spring, which is sleeved on the outside of the reset pin and located between the reset baffle and the reset seat.

[0014] Preferably, a lower die slide is provided on the lower die base, the lower die slide cooperates with the lower die base to form a lower die slide groove, and the lower die seat is movably placed in the lower die slide groove.

[0015] Preferably, a middle mold reset component and a middle mold guide component are provided on the middle mold base; the upper end of the middle mold reset component is provided on the middle mold base, and the lower end is provided on the lower mold base, so that the middle mold base has a movement tendency away from the lower mold base; the upper end of the middle mold guide component is provided on the middle mold base, and the lower end is movably provided on the lower mold base through a guide sleeve.

[0016] Preferably, a limiting portion is provided on the flap member, and the limiting portion is always movable to abut against the edge of the workpiece.

[0017] Preferably, the center angles of the upper mold arc surface and the lower mold arc surface are adapted and both are greater than 90°.

[0018] Compared with the existing technology, this technical solution has the following outstanding and beneficial technical effects:

[0019] 1. The various devices designed in this technical solution can cooperate to gradually process the workpiece. The gradual processing of the workpiece can provide a buffering process when the workpiece is bent, making the bending angle more precise, thereby improving the processing quality of the workpiece and avoiding the low quality of the workpiece formed in one time. First, the upper die seat moves toward the middle die seat, and the two cooperate with each other to complete the clamping of the workpiece. Then the two continue to move toward the lower die seat along the mold closing direction. At this time, the flap hinged on the middle die seat is blocked by the lower die seat and then rotates. Since the part of the workpiece that needs to be processed is against the flap, the rotation of the flap will cause the workpiece to be bent. During the bending process, the surface of the workpiece respectively abuts the upper die seat and the flap, and the two cooperate to perform the first shaping of the workpiece. This process ensures that the surface of the workpiece is clamped at all times, which increases the stability of the workpiece during processing.

[0020] After the first shaping is completed, the middle die base drives the middle die base to continue moving to the lower die base. When it moves to the set position, the upper die arc surface of the upper die base cooperates with the lower die arc surface of the lower die base to perform a second bending and shaping on the workpiece, thereby effectively ensuring the bending angle and quality. At the same time, the flap also acts on the workpiece to further bend the workpiece so that the workpiece meets the processing standards.

[0021] 2. The propulsion part designed in this technical solution cooperates with the lower die base to realize the movement of the lower die base in a direction perpendicular to the mold closing direction. When the lower die base moves toward the upper die base in a direction perpendicular to the mold closing direction, the upper die arc surface and the lower die arc surface can cooperate to process the workpiece. The upper die arc surface and the lower die arc surface are close to the workpiece, which can ensure the bending angle of the workpiece, thereby making the workpiece meet the bending standard. It can also effectively improve the problem of insufficient bending angle caused by metal rebound. At this time, after the external force is removed, the workpiece will have a predetermined curvature after rebound. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of workpiece processing flow.

[0023] Figure 2 This is a schematic diagram of the structure when the mold is opened for this technical solution.

[0024] Figure 3 This is a structural diagram of the technical solution.

[0025] Figure 4 This is a schematic diagram of the structure after the middle mold device and the lower mold device are separated.

[0026] Figure 5 This is one of the cross-sectional views of this technical solution.

[0027] Figure 6 This is the second sectional view of this technical solution.

[0028] Figure 7 It is a structural schematic diagram of part of the lower mold device.

[0029] Figure 8 This is a cross-sectional view of part of the device of this technical solution.

[0030] Figure 9 This is a schematic diagram of the structure of the technical solution when the mold is closed.

[0031] Figure 10 This is one of the cross-sectional views of the technical solution when it is working.

[0032] Figure 11 This is the second sectional view of the technical solution when it is working.

[0033] Reference numerals: 1, upper die assembly; 11, upper die base; 111, limiting column 1; 12, upper die seat; 121, upper die baffle; 122, blanking rod; 13, upper die arc surface; 14, propulsion portion; 141, inclined surface 1; 2, middle die assembly; 21, middle die base; 22, middle die seat; 23, flap member; 231, contact surface; 232, limiting portion; 233, arc-shaped convex portion; 24, middle die reset member; 25, middle die guide member; 26, guide shaft sleeve; 27, flap mechanism; 271, flap mounting seat; 272, flap mounting frame; 273, flap tension spring; 3 , lower die device; 31, lower die base; 311, limiting column 2; 32, lower die seat; 321, inclined surface 2; 33, lower die arc surface; 34, reset assembly; 341, reset seat; 3411, support block; 342, reset pin; 343, reset baffle; 344, reset spring; 35, lower die slide; 351, lower die slide; 36, mounting part; 361, roller; 37, middle die limiting plate; 4, workpiece; 41, main body; 42, vertical side wall; 43, bending arc part; 5, adjustment assembly; 51, adjustment seat; 52, adjustment pin; 53, adjustment spring. DETAILED DESCRIPTION

[0034] The specific implementation of the technical solution is further described in detail below with reference to the accompanying drawings.

[0035] like Figure 1 and Figure 2 As shown, the workpiece 4 to be processed includes a main body 41 and a vertical side wall 42. There is at least one vertical side wall 42. The vertical side wall 42 is arranged on the end side of the main body 41 and is perpendicular to the main body 41. When the workpiece 4 is processed, the end of the workpiece 4 where the vertical side wall 42 is not arranged is bent to form a flange arc in the workpiece 4. During this processing, the main body 41 and the vertical side wall 42 are bent at the same time. When the main body 41 is bent, only force needs to be applied. When the vertical side wall 42 is bent, its outer edge will be stretched. Therefore, after the workpiece 4 is bent, part of the vertical side wall 42 will form a bent arc portion 43.

[0036] like Figure 2 As shown, the mold of the present application is mainly used for forming flange arcs. During the processing, it is necessary to ensure that the stretched position maintains a flat state to meet the processing standards. In actual production, the mold closing direction can be set as needed. The mold closing direction set in this application is the vertical direction, that is, the upper mold device 1 descends and approaches the middle mold device 2 as the mold closing direction, and the upper mold device 1 and the middle mold device 2 synchronously descend and approach the lower mold device 3 as the mold closing direction. Therefore, the direction perpendicular to the mold closing direction is the horizontal direction.

[0037] Furthermore, the upper mold device 1 moves downward to approach the middle mold device 2, and cooperates with the middle mold device 2 to clamp the workpiece 4. Then the upper mold device 1 and the middle mold device 2 descend together to approach the lower mold device 3. In this process, the bending arc portion 43 is first formed, and then the bending arc portion 43 is further shaped. After the workpiece 4 is processed, the upper mold device 1 and the middle mold device 2 move upward and reset. This is a processing cycle. In the embodiment of the present application, the bending angle of the workpiece 4 is greater than 90°, actually 97°. In order to avoid insufficient bending angle due to metal rebound, the bending arc portion 43 will be processed multiple times to ensure that the processing standards are met.

[0038] like Figure 2 and Figure 3 As shown, a sheet metal flange arc forming mold includes an upper mold device 1, a middle mold device 2 and a lower mold device 3. The middle mold device 2 is movably arranged on the lower mold device 3. The upper mold device 1 and the middle mold device 2 are arranged relative to each other. The upper mold device 1 and the middle mold device 2 can both be lifted up and down independently, and cooperate with each other to complete the processing of the workpiece 4. The upper mold base 12 of the upper mold device 1 has an upper mold arc surface 13, and the middle mold base 21 of the middle mold device 2 is provided with a flip mechanism 27. The lower mold base 32 of the lower mold device 3 has a lower mold arc surface 33. After the upper mold base 12 and the middle mold base 22 of the middle mold device 2 cooperate to position the workpiece 4, the flip member 23 of the flip mechanism 27 forms the edge of the workpiece 4, and then the upper mold base 12 and the lower mold base 32 cooperate to process the workpiece 4, and the upper mold arc surface 13 and the lower mold arc surface 33 process the workpiece 4 again. At the same time, the flip member 23 also acts on the workpiece 4 again to process the workpiece 4.

[0039] like Figure 3 As shown, the upper mold device 1 includes an upper mold base 11 and an upper mold seat 12. The upper mold seat 12 is arranged in the middle of the upper mold base 11. The upper mold seat 12 has at least one upper mold arc surface 13. The number of upper mold arc surfaces 13 is adapted to the number of end faces that need to be processed of the workpiece 4. In this embodiment, the vertical side walls 42 are arranged in the left and right directions of the main body 41, and the position to be processed is in the front and back directions of the main body 41. The position and orientation of the upper mold device 1, the middle mold device 2 and the lower mold device 3 are adapted to the position and orientation of the workpiece 4. The front and rear ends of the workpiece 4 need to be bent, so the number of upper mold arc surfaces 13 is set to two. These two upper mold arc surfaces 13 are respectively formed at the front and rear ends of the upper mold seat 12. The surface of the upper mold seat 12 is in contact with the main body 41 of the workpiece 4. The upper mold arc surface 13 is in contact with the upper surface of the workpiece 4 when processing the workpiece 4, and is used to support and clamp the workpiece 4 to improve the stability of the workpiece 4 during processing and ensure the production quality of the workpiece 4.

[0040] like Figure 3As shown, an upper mold baffle 121 is provided on at least one of the left and right sides of the upper mold base 12, and the upper mold baffle 121 partially extends downward from the upper mold base 12. The upper mold baffle 121 is used to support the vertical side wall 42 of the workpiece 4. With the support of the upper mold baffle 121, the vertical side wall 42 of the workpiece 4 can be kept in a flat state during processing without bending, thereby improving the product yield.

[0041] like Figure 3 As shown, a blanking rod 122 is provided on the upper mold base 11, and the blanking rod 122 is telescopically set on the upper mold base 11. When the workpiece 4 abuts against the middle mold base 22, the workpiece 4 is pressed to drive the blanking rod 122 back into the loading base. When the blanking rod 122 is not subjected to force, it will extend out of the upper mold base 12, and at the same time make the workpiece 4 detach from the upper mold base 12, leaving the workpiece 4 on the middle mold base 22, so that people can collect materials conveniently. The blanking rod 122 can be set on the upper mold base 11 by a spring, or it can be telescopically set on the upper mold base 11 by other means.

[0042] like Figure 3 and Figure 4 As shown, the middle mold device 2 includes a middle mold base 21, a middle mold base 22 and at least one set of flip mechanisms 27, each set of flip mechanisms 27 includes a flip member 23, the middle mold base 22 is set on the middle mold base 21, and the flip members 23 are rotatably set at the front and rear ends of the middle mold base 22. In this embodiment, the number of flip mechanisms 27 is set to two sets, so the number of flip members 23 is also set to two. When the flip member 23 is not working, its position is adapted to the middle mold base 22, and the upper surface of the flip member 23 and the middle mold base 22 is on the same horizontal line and remains horizontal. State, so that the workpiece 4 can be placed flat on it, and the lower surface is in contact with the middle die seat 22 and the flap 23. At this time, the main body 41 of the workpiece 4 is located on the middle die seat 22, the bent portion is located on the flap 23, and the lower end face of the flap 23 is against the lower die seat 32. When the middle die base 21 and the middle die seat 22 descend, the flap 23 will rotate with the center of the upper die arc surface 13 as the center point, that is, the rotation path of the flap 23 is concentric with the upper die arc surface 13. During the rotation of the flap 23, the bent portion of the workpiece 4 can be subjected to the first plastic bending.

[0043] like Figure 4As shown, in this embodiment, the number of flip-plate mechanisms 27 is set to two sets, which are respectively located at the front and rear ends of the middle mold base 21. Each flip-plate mechanism 27 includes two flip-plate mounting seats 271 and two flip-plate mounting frames 272. The flip-plate mounting seats 271 are symmetrically arranged on the left and right sides of the middle mold base 21, and the flip-plate mounting frames 272 are arranged on the corresponding flip-plate mounting seats 271. The two ends of the flip-plate member 23 are respectively fixedly connected to the two flip-plate mounting frames 272, and the flip-plate tension spring 273 is used for resetting after processing. The two ends of the flip-plate tension spring 273 are respectively connected to the lower mold base 31 and the flip-plate mounting frame 272. The flip-plate tension spring 273 is used to make the flip-plate member 23 always have a movement tendency to expand. When the flip-plate member 23 rotates inward and retracts, the flip-plate tension spring 273 will be stretched. After the mold is opened, as the middle mold base 21 drives the flip-plate member 23 to rise, the flip-plate tension spring 273 itself contracts and drives the flip-plate member 23 to expand and reset.

[0044] like Figure 4 As shown, a plurality of limiting portions 232 are provided on the flap member 23, and the limiting portions 232 are used to limit the workpiece 4 so that the workpiece 4 is positioned during the bending process. When the workpiece 4 is placed on the middle die base 22, the front and rear ends of the workpiece 4 are both in contact with the limiting portions 232 on the flap member 23. When the workpiece 4 is bent, the force applied thereto will cause the workpiece 4 to retreat, and the limiting portions 232 will resist the workpiece 4 to prevent it from retreating, thereby achieving a better processing effect.

[0045] like Figure 5 and Figure 6 As shown, a middle mold reset component 24 and a middle mold guide component 25 are provided on the middle mold base 21. In this embodiment, the middle mold reset component 24 is configured as a plurality of nitrogen springs, the upper end of which is fixedly connected to the middle mold base 21, and the lower end is arranged in the lower mold base 31, so that the middle mold base 21 has a movement tendency away from the lower mold base 31. After the middle mold base 21 descends, the nitrogen spring is compressed and shrinks in the lower mold base 31. When the upper mold base 12 loses the pressure applied to the middle mold base 22, the nitrogen spring pushes the middle mold base 21 upward and resets it.

[0046] like Figure 6 As shown, the upper end of the middle mold guide 25 is fixedly connected to the middle mold base 21, and the lower end is movably set in the lower mold base 31 through the guide shaft sleeve 26. It can slide and retract in the lower mold base 31 to guide the middle mold base 21 when it moves.

[0047] like Figure 7 and Figure 8As shown, the lower die device 3 includes a lower die base 31 and a lower die seat 32. The lower die seat 32 is movably arranged on the lower die base 31. The lower die seat 32 can move on the lower die base 31 perpendicular to the mold closing direction, which is horizontal movement in this embodiment. The number of lower die seats 32 is set to two, which are arranged at the front and rear ends of the lower die base 31. Each lower die seat 32 has a lower die arc surface 33. The shape of the lower die arc surface 33 is adapted to the shape of the upper die arc surface 13. The lower die arc surface 33 abuts against the workpiece 4 when the workpiece 4 is processed. After being bent, the workpiece 4 is clamped by the upper die arc surface 13 and the lower die arc surface 33, and at the same time fits with the upper die arc surface 13 and the lower die arc surface 33. The lower die arc surface 33 abuts against the lower surface of the workpiece 4 when processing the workpiece 4.

[0048] like Figure 7 and Figure 8 As shown, when the upper die base 12 descends and approaches the lower die base 31, the upper die arc surface 13 and the lower die arc surface 33 gradually approach each other. At this time, it is necessary to make the lower die arc surface 33 and the upper die arc surface 13 close to each other to obtain a better processing effect, so the lower die base 32 needs to move toward the upper die base 12. Therefore, the lower die base 32 needs to be able to move horizontally on the lower die base 31. A lower die slide 35 is provided on the lower die base 31. The lower die slide 35 is located on both sides of the lower die base 32. The lower die slide 35 cooperates with the lower die base 31 to form a lower die slide groove 351. There are protrusions on both sides of the lower die base 32, and the protrusions are movably placed in the lower die slide groove 351, so that the lower die base 31 can move horizontally on the lower die base 31.

[0049] like Figure 8 As shown, the power for realizing the movement of the lower die base 32 is provided by the lowering of the upper die base 12, and a propulsion mechanism is provided on the upper die base 11. Since the central angles of the upper die arc surface 13 and the lower die arc surface 33 are both greater than 90°, the straight up and down operation mode cannot make the upper die arc surface 13 and the lower die arc surface 33 fit together. It is necessary to first lower the upper die base 12 to the side of the lower die base 32 in an offset manner, and then push the lower die base 32 to move in the direction of the upper die base 12.

[0050] like Figure 8 As shown, the propulsion mechanism includes a propulsion part 14, the propulsion part 14 has a slope 141, and the lower die base 32 has a slope 2 321 adapted to the slope 141. When the propulsion part 14 moves toward the lower die base 32, under the action of the slope 141 and the slope 2 321, the lower die base 32 can be moved horizontally toward the workpiece 4. In order to increase the effect of the action between the slopes, a support block 3411 is provided on the reset seat 341 of the reset assembly 34. When the propulsion part 14 and the lower die base 32 are in contact, the support block 3411 is located on the other side of the propulsion part 14 to support the propulsion part 14, so that the propulsion part 14 can push the lower die base 32 to move.

[0051] like Figure 8 When the cam 342 is in the unlock state, the cam 343 is in the unlock state, and the cam 344 is in the unlock state, so that the cam 343 is unlocked and the cam 344 is unlocked.

[0052] like Figure 2 and Figure 9 As shown, it is a state diagram of the mold when it is opened and closed. A plurality of limit columns 111 are provided on the upper mold base 11, and a plurality of limit columns 2 311 are provided on the lower mold base 31. When the mold is closed, the limit columns 111 and the limit columns 2 311 are connected in alignment to ensure the accurate alignment of the upper mold device 1 and the lower mold device 3.

[0053] like Figure 10 and Figure 11 As shown, when the flap 23 rotates and continues to follow the middle mold base 21 to descend after the flap 23 rotates, friction will be generated between it and the lower mold base 32. Therefore, a mounting portion 36 is provided on the lower mold base 32. A roller 361 is provided on the mounting portion 36. The roller 361 movably abuts the end face of the flap 23, which can convert sliding friction into rolling friction, thereby increasing the service life of the equipment and reducing wear. During the bending process of the workpiece 4, the mold processes the workpiece 4 three times. Figure 10 and Figure 11 This is a critical state diagram. Through the critical state diagram, the entire processing process can be divided into three processing processes.

[0054] like Figure 10 As shown, the first processing process is: from the start of the rotation of the flap member 23 to the contact of the propulsion portion 14 with the lower die base 32, this process can be completed only by the downward movement of the upper die base 12 and the middle die base 22. The roller 361 provided on the lower die base 32 blocks the distal end of the flap member 23, thereby realizing the rotation of the flap member 23. Figure 11 The dotted line in represents the rotation angle of the flap member 23 . At this time, the propulsion portion 14 has not yet abutted against the lower die base 32 .

[0055] Through this process, the workpiece 4 can be pre-bent, and the farthest end of the workpiece 4 is bent first. The farthest end of the workpiece 4 is the far end of the abutment part of the pre-flip plate 23 at this time. In this way, the part between the farthest end of the workpiece 4 and the main body 41 will be automatically shaped along the upper mold arc surface 13. It is more labor-saving to pre-bend the far end first. At the same time, bending the workpiece 4 in steps can ensure the quality of the bent workpiece 4 and effectively avoid the problem of excessive deformation caused by directly bending the workpiece 4 at one time.

[0056] like Figure 10 and Figure 11 As shown, the second processing process is: from the contact between the propulsion part 14 and the lower die base 32 to the time when the flip plate 23 is about to separate from the roller 361, during this process, the lower die base 32 continuously moves toward the upper die base 12, gradually shortening the distance between the upper die arc surface 13 and the lower die arc surface 33, and shaping the workpiece 4. At the same time, the lower die base 32 also continuously drives the roller 361 to move toward the upper die base 12, and the distance between the roller 361 and the flip plate 23 is continuously retracted. At the same time, the flip plate 23 is also continuously driven downward by the middle die base 21, and the flip plate 23 continues to rotate to process the workpiece 4.

[0057] Although there is still a distance between the upper die arc surface 13 and the lower die arc surface 33 during this process, the bending arc portion 43 can be initially formed to further increase the bending angle of the farthest end of the workpiece 4. During this process, the upper die base 12 and the lower die base 32 can be matched through the propulsion portion 14 to further process the workpiece 4, and the upper die base 12 can gradually enter the lower die arc surface 33 of the lower die base 32 to realize the forming of the flange arc.

[0058] like Figure 11 As shown, the third processing process is: after the flap 23 is separated from the roller 361 to the end of the processing, in this process, the rotation of the flap 23 is completed by the interaction between the position of the flap 23 and the lower die seat 32. Since the middle die base 21 still continuously drives the flap 23 downward, the flap 23 is still blocked by the lower die seat 32 to achieve its own flipping. An arc-shaped convex portion 233 is provided on the inner side wall of the flap 23. The flap 23 is movably abutted against the lower die seat 32 through the arc-shaped convex portion 233. When the middle die seat 22 drives the flap 23 When moving to the set position, the lower die base 32 acts on the inner wall of the flap part 23 through the arc-shaped protrusion 233, causing the flap part 23 to rotate, thereby realizing the third shaping of the workpiece 4. The set position is the position where the roller 61 is about to disengage from the flap part 23. In this way, the arc-shaped protrusion 233 can ensure the rotation of the flap part 23 and reduce the friction between it and the lower die base 32. When the mold is closed, the flap part 23 also reaches the preset flipping angle. At this time, the upper mold arc surface 13 and the lower mold arc surface 33 have also completed the processing of the workpiece 4.

[0059] In this process, the direction of force applied to the flap member 23 is changed. The original force was applied on the end face of the flap member 23 through the roller 361, and the current force is applied on the side of the flap member 23 through the lower mold base 32. In this way, the radius of the roller 361 can be reduced, saving the narrow space in the mold and making the structure in the mold more compact. At the same time, in this process, the far end of the workpiece 4 can also be bent by more than 90°. When bending the far end of the workpiece 4, the part between the far end of the workpiece 4 and the main body 41 has been shaped by the upper mold arc surface 13 and the lower mold arc surface 33. Therefore, it is also possible to avoid affecting the bending of the far end of the workpiece 4 when processing this part, which greatly improves the bending quality of the workpiece 4 and enables it to reach the preset bending angle.

[0060] like Figure 3 and Figure 4 As shown, an adjustment component 5 is provided on the middle die base 21, and the adjustment component 5 is used to adjust the position of the workpiece 4 when it is placed on the middle die base 22. The adjustment component 5 includes an adjustment seat 51, an adjustment pin 52 and an adjustment spring 53. The adjustment seat 51 is set on the middle die base 22, and the adjustment pin 52 is movably set on the adjustment seat 51 through the adjustment spring 53. If the workpiece 4 is placed on the middle die base 22 in an offset manner, the workpiece 4 will squeeze one end of the adjustment pin 52, and the adjustment spring 53 will work, so that the adjustment pin 52 drives the workpiece 4 to move to a suitable position, which is convenient for subsequent processing.

[0061] like Figure 4 As shown, a middle mold limit plate 37 is provided on the lower mold base 31, and the left and right side walls of the middle mold base 21 movably abut the middle mold limit plate 37, which can ensure that the middle mold base 21 descends smoothly without deviation, thereby improving the qualified rate of the workpiece 4.

[0062] The working principle of this technical solution is as follows: the upper mold device 1 descends and approaches the middle mold device 2 to close the mold, which is used to clamp the workpiece 4. Then the upper mold device 1 drives the middle mold device 2 to synchronously descend and approach the lower mold device 3. During this process, the flap 23 flips over to perform the first shaping. As the upper mold device 1 drives the middle mold device 2 to continue to descend, the upper mold arc surface 13 of the upper mold base 12 and the lower mold arc surface 33 of the lower mold base 32 cooperate to shape the workpiece 4 again. After the workpiece 4 is processed, the upper mold device 1 rises, and at the same time, the middle mold device 2 moves upward and resets through the middle mold reset member 24 until both are back to the initial state. This is one processing cycle.

[0063] The above shows and describes the basic principles and main features of the present technical solution and the advantages of the present technical solution. Those skilled in the art should understand that the present technical solution is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present technical solution. Various changes and improvements may be made to the present technical solution without departing from the spirit and scope of the present technical solution. Such changes and improvements fall within the scope of the present technical solution for which protection is sought. The scope of protection claimed by the present technical solution is defined by the appended claims and their equivalents.

Claims

1. A sheet metal flange arc forming die, characterized in that: include: An upper die device (1) comprises an upper die base (11) and an upper die seat (12) arranged on the upper die base (11), wherein the upper die seat (12) has an upper die arc surface (13) for processing a workpiece (4); A middle mold device (2) comprises a middle mold base (21) and a middle mold seat (22) arranged on the middle mold base (21), wherein a flap mechanism (27) adapted to the position of the middle mold seat (22) is hingedly arranged on the middle mold base (21); and A lower die device (3) comprises a lower die base (31) and a lower die seat (32) arranged on the lower die base (31), wherein the lower die seat (32) has a lower die cambered surface (33) adapted to the upper die cambered surface (13); Wherein, the middle mold base (21) is movably arranged on the lower mold base (31); After the mold is closed, the middle mold base (22) cooperates with the upper mold base (12) to clamp the main body (41) of the workpiece (4), and the end face of the flip plate member (23) of the flip plate mechanism (27) abuts against the lower mold base (32). When the upper mold base (12) and the middle mold base (22) continue to drive the flip plate member (23) to move along the mold closing direction, the end of the flip plate member (23) away from the middle mold base (22) is blocked by the lower mold base (32), causing the flip plate member (23) to rotate, thereby realizing the first shaping of the bent arc portion (43) of the workpiece (4); As the upper die base (12) and the middle die base (22) continue to move, the upper die arc surface (13) cooperates with the lower die arc surface (33) to achieve a second shaping of the bent arc portion (43) of the workpiece (4).

2. The sheet metal flange arc forming die according to claim 1, characterized in that: It also includes a propulsion mechanism, which is used to drive the lower die base (32) to move toward the upper die base (12), thereby achieving the upper die arc surface (13) and the lower die arc surface (33) cooperating with each other to process the bending arc portion (43) of the workpiece (4).

3. The sheet metal flange arc forming die according to claim 2, characterized in that: The propulsion mechanism comprises a propulsion portion (14) provided on the upper die base (11), the propulsion portion (14) having a first inclined surface (141), and the lower die base (32) having a second inclined surface (321) adapted to the first inclined surface (141); When the propulsion portion (14) moves toward the lower die base (32), under the action of the first inclined surface (141) and the second inclined surface (321), the lower die base (32) moves toward the upper die base (12).

4. A sheet metal flange arc forming die according to any one of claims 1 to 3, characterized in that: The flap mechanism (27) comprises: A flap mounting seat (271) is provided on the middle mold base (21); A flap mounting frame (272) hingedly connected to the flap mounting seat (271); A flap member (23) is provided on the flap mounting frame (272) and has a contact surface (231) for abutting against the workpiece (4); and A flap tension spring (273) has one end arranged on the lower die base (31) and the other end arranged on the flap mounting frame (272).

5. The sheet metal flange arc forming die according to claim 4, characterized in that: The lower die base (32) is provided with a mounting portion (36), and a roller (361) is rotatably provided on the mounting portion (36), and the roller (361) movably abuts against the end surface of the flap member (23).

6. The sheet metal flange arc forming die according to claim 2, characterized in that: The propulsion mechanism further includes a reset assembly (34) disposed on the lower mold base (31), which comprises: A reset seat (341) is provided on the lower mold base (31); A reset pin (342) is movably arranged in the reset seat (341) and passes through the reset seat (341) to be connected to the lower die seat (32); a reset baffle (343), which is arranged on the reset pin (342); and The reset spring (344) is sleeved outside the reset pin (342) and is located between the reset baffle (343) and the reset seat (341).

7. The sheet metal flange arc forming die according to claim 6, characterized in that: A lower die slide (35) is provided on the lower die base (31), and the lower die slide (35) cooperates with the lower die base (31) to form a lower die slide groove (351), and the lower die seat (32) is movably placed in the lower die slide groove (351).

8. The sheet metal flange arc forming die according to claim 1, characterized in that: A middle mold reset component (24) and a middle mold guide component (25) are provided on the middle mold base (21); The upper end of the middle mold resetting member (24) is arranged on the middle mold base (21), and the lower end is arranged on the lower mold base (31), so as to make the middle mold base (21) have a movement tendency away from the lower mold base (31); The upper end of the middle mold guide (25) is arranged on the middle mold base (21), and the lower end is movably arranged on the lower mold base (31) through a guide shaft sleeve (26).

9. The sheet metal flange arc forming die according to claim 1, characterized in that: A limiting portion (232) is provided on the flap member (23), and the limiting portion (232) is always movable to abut against the edge of the workpiece (4).

10. The sheet metal flange arc forming die according to claim 8, characterized in that: The center angles of the upper mold cambered surface (13) and the lower mold cambered surface (33) are adapted and both are greater than 90°.

Images