Insert type swing bending forming die

Abstract

The utility model discloses an insert type swing bending forming die which comprises a male die and a female die, the female die comprises a swing insert, a discharging insert and a bending insert, the swing insert is rotationally connected to a swing fixing block, a rotating shaft is arranged on the swing insert, the axis of the rotating shaft is parallel to the forming face of the swing insert, and the discharging insert is arranged on the swing fixing block. The swing fixing block is provided with an insert seat for accommodating a swing insert and a hole seat matched with the rotating shaft, a swing angle is formed between the swing fixing block and the swing insert, the swing fixing block is provided with a first bending angle, and the rotating shaft and the stress projection plane of the first bending angle are mutually staggered; and the discharging insert and the elastic material ejecting device are matched with each other to discharge the bent workpiece. The overall stress of the die is reasonable, and the design precision of the die is kept under the condition that the service life of the die is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of bending dies, and in particular relates to an insert-type swing bending forming die. Background Art

[0002] The bending machine mold is a tool used by the bending machine to shape and process sheet materials. This tool is composed of various parts, and different molds are composed of different parts. It mainly realizes the processing of the shape of the object by changing the physical state of the material being formed. It is a tool used to make the blank into a product with a specific shape and size under the pressure of the bending machine.

[0003] In actual production life, plastic bending is the same as any other plastic deformation. After the external load is removed, there is elastic deformation, which makes the size of the workpiece inconsistent with the size of the mold. This phenomenon is called springback. The compensation method is usually used to control springback on the mold. The compensation method requires the calculation of the bending springback of the bent workpiece. Plastic bending is the same as any other plastic deformation. After the external load is removed, there is elastic deformation.

[0004] There is a Chinese patent CN202321216371.4 disclosed in the prior art, which discloses a swing-type bending avoidance mechanism, including a base, a forming mold, and a rotating shaft passing between the base and the forming mold. The forming mold is mounted on the base in a swinging manner through the rotating shaft and can be switched between an open state and a closed state through a swinging action. The forming mold is provided with a forming cavity for extruding and forming a workpiece. The swing-type bending avoidance mechanism has the advantages of small processing volume, being able to complete bending simply, conveniently and effectively, improving production efficiency, and being highly practical.

[0005] However, since the bending avoidance mechanism adopts a split structure and its rotating shaft is set within the projection plane of the forming surface of the mold, the impact force of the mold closing is completely borne by the rotating shaft. After a long period of use, the rotating shaft structure is easily deformed by the impact force of the mold closing, which in turn affects the fit between the rotating shaft and the forming mold, resulting in deviations in the accuracy of the bending mold. At the same time, the die of the mechanism as a whole bears all the impact and wear of the formed workpiece. After long-term use, the forming surface of the mold is excessively worn and cannot maintain the original design accuracy. Therefore, it is necessary to design a new bending forming mold to solve the above problems. Utility Model Content

[0006] The utility model aims to provide an insert-type swing bending forming die to solve the problems of unreasonable force, poor precision and short service life of the bending avoidance mechanism proposed in the above-mentioned background technology.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] An insert-type swing bending forming mold comprises a male mold and a female mold, wherein the female mold comprises a swing insert, wherein the swing insert is rotatably connected to a swing fixed block, wherein a rotating shaft is provided on the swing insert, wherein the axis of the rotating shaft is parallel to the forming surface of the swing insert, wherein the swing fixed block is provided with an insert seat for accommodating the swing insert and a hole seat matched with the rotating shaft, wherein a swing angle θ is provided between the swing fixed block and the swing insert, wherein a first bending angle is provided on the swing fixed block, and the force-bearing projection surfaces of the rotating shaft and the first bending angle are staggered with each other. The swing insert and the swing fixed block both adopt an insert-type design, so that the insert can be replaced at any time when it needs to be replaced, thereby increasing the service life of the mold; at the same time, the projections of the swing insert and the swing fixed block in the force direction are staggered with each other, thereby reducing the stress borne by the rotating shaft, and the force is reasonable, thereby increasing the service life of the mold; furthermore, the bending swing design of the swing insert increases the rebound effect of the workpiece during the bending forming process, thereby increasing the precision of the workpiece.

[0009] Furthermore, the swing insert is provided with a discharge insert at its side, the upper surface of the discharge insert is the molding surface of the mold, the discharge insert is provided with an upper protrusion at the position connected with the swing insert, the swing insert is provided with a lower protrusion below the upper protrusion to abut against the upper protrusion, and an elastic lifting device is connected below the discharge insert, and the elastic lifting device enables the discharge insert to move up and down in the vertical direction. The discharge insert has the function of discharging the molded workpiece of the mold on the one hand, lifting the workpiece after the workpiece is formed to separate it from the bending molding surface, and on the other hand, the upper protrusion of the discharge insert cooperates with the lower protrusion of the swing insert to change the swing state of the swing insert.

[0010] Furthermore, the elastic ejection device includes a connecting plate, a lower die base and a cushion block; the connecting plate is in close contact with the lower surface of the unloading insert, the cushion block is in close contact with the lower surface of the connecting plate, the lower die base is in close contact with the lower surface of the lower die base, the connecting plate, the cushion block and the lower die base are fastened and connected by bolts and pins, the connecting plate is connected with a limiting screw, the threaded end of the limiting screw is connected to the connecting plate, the bolt head end of the limiting screw is suspended on one side of the connecting plate, the connecting plate is provided with a countersunk hole for accommodating the limiting screw, the upper surface of the lower die base is fixedly connected with a nitrogen spring, the ejection end of the nitrogen spring passes through the connecting plate and is connected to the lower surface of the unloading insert, and the lower end of the swing fixed block is fixedly connected to the upper surface of the lower die base. The function of the elastic ejection device is to push up the unloading insert and provide power support for the unloading process. At the same time, the elastic ejection device also serves as a supporting member for the entire mold.

[0011] Furthermore, the unloading insert is provided with a bending insert at the other end opposite to the swinging insert, the bending insert is fixedly connected to the connecting plate, a bend is provided on the upper surface of the bending insert, and the molding surface of the mold is provided on the upper surface of the bending insert with a second bending angle.

[0012] Furthermore, the lower surface of the male mold is in contact with the molding surface of the female mold, and the male mold is provided with molding cavities for accommodating workpieces on both sides of the bending direction, and side panels are closely arranged on the outer side of the molding cavity, and the side panels are fixedly connected to the female mold. The molding cavity structure and the side panel structure of the male mold enable the molding workpiece of the mold to be tightly pressed in the molding cavity, so that it is smoothly molded, and this structure enables the mold to have the function of lateral bending.

[0013] Furthermore, the side panel is fixedly connected with a stripping hook on both sides of the bending direction, and one end of the stripping hook is close to the inner side of the forming cavity. The stripping hook is used to strip the workpiece to prevent the workpiece from being clamped on the punch.

[0014] Furthermore, a reset bolt is connected to the vertical end surface of the swing insert, the reset bolt is perpendicular to the swing insert, the reset bolt passes through the swing fixing block, the swing fixing block is provided with a reset hole for accommodating the reset bolt, and a reset spring is connected between the bolt head of the reset bolt and the outer side surface of the swing fixing block. The reset bolt and the reset spring cooperate to reset the swing insert, pull the swing insert, and make the vertical surface of the swing insert close to the swing fixing block.

[0015] Furthermore, two ends of the upper surface of the concave mold are connected to a positioning plate, and the positioning plate is adjustably connected to the two end sides of the molding cavity. The function of the positioning plate is to limit the orientation of the workpiece processed by the mold so that it is stably in this position.

[0016] Furthermore, an upper die seat is fixedly connected to the upper surface of the punch, and the function of the upper die seat is to connect the punch with the press and to protect the entire mold.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The bending workpiece is processed by an insert-type bending forming die. After long-term wear and tear, the inserts of the corresponding parts of the punch and the die can be directly replaced, which increases the service life of the die.

[0019] 2. The springback of the bent workpiece is controlled by a compensation method, and a swing-type structural design is used for bending and forming, which increases the accuracy of the mold. At the same time, the force of the mold is made more reasonable by staggering the projection of the rotating shaft and the first bending angle in the force direction, thereby increasing the service life of the mold while maintaining the design accuracy of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is a schematic diagram of a half-section structure of the utility model;

[0023] In the figure: 1. punch; 11. forming cavity; 2. die; 21. swing insert; 211. rotating shaft; 212. lower protrusion; 22. unloading insert; 221. upper protrusion; 23. bending insert; 231. second bending angle; 24. side panel; 3. swing fixing block; 31. insert seat; 32. hole seat; 33. first bending angle; 34. reset hole; 4. elastic ejecting device; 41. connecting plate; 411. countersunk hole; 42. lower die seat; 43. cushion block; 44. limiting screw; 45. nitrogen spring; 5. unloading hook; 6. upper die seat; 7. reset spring; 8. reset bolt; 9. positioning plate; θ swing angle. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0025] Reference Figure 1 , Figure 2 The utility model proposes a technical solution: an insert-type swing bending forming mold, including a punch 1 and a die 2, the die 2 includes a swing insert 21, a discharge insert 22 and a bending insert 23. The insert-type design divides the forming surface of the die 2 into three parts, each part can be directly replaced in the case of wear or damage, thereby increasing the service life of the mold.

[0026] In this embodiment, further, the swing insert 21 is rotatably connected to a swing fixed block 3 , and a rotating shaft 211 is provided on the swing insert 21 . The rotating shaft 211 is integrated with the swing insert 21 , and the rotation connection is achieved through the rotating shaft 211 . The axis of the rotating shaft 211 is parallel to the forming surface of the swing insert 21. The swing fixed block 3 is provided with an insert seat 31 for accommodating the swing insert 21 and a hole seat 32 cooperating with the rotating shaft 211. The rotating shaft 211 on the swing insert 21 directly cooperates with the hole seat 32 to realize rotation and swing. A swing angle θ is set between the swing fixed block 3 and the swing insert 21. The swing angle θ is an important feature for realizing compensation for rebound. The swing angle is greater than the rebound angle of the first bending angle 33. The relationship between the swing angle θ and the rebound angle of the swing insert 21 is debugged and determined in a large number of experiments. The swing fixed block 3 is provided with a first bending angle 33. The projections of the rotating shaft 211 and the first bending angle 33 in the force direction are staggered with each other. This structure allows the impact force of the punch on the swing insert 21 to avoid the rotating shaft 211, so that the force on the swing insert 21 is reasonable, less prone to damage, and the service life is increased. A reset bolt 8 is connected to the vertical end surface of the swing insert 21, the reset bolt 8 is perpendicular to the swing insert 21, the reset bolt 8 passes through the swing fixed block 3, the swing fixed block 3 is provided with a reset hole 34 for accommodating the reset bolt 8, and a reset spring 7 is connected between the bolt head of the reset bolt 8 and the outer side surface of the swing fixed block 3. The reset bolt 8 drives the swing insert 21 to lean towards the swing fixed block 3 under the push of the supporting force of the reset spring 7, which is the open mold state of the mold.

[0027] In this embodiment, further, the swing insert 21 is provided with a discharge insert 22 at its side, the upper surface of the discharge insert 22 is the molding surface of the mold, the discharge insert 22 is provided with an upper protrusion 221 at the position connected with the swing insert 21, and the swing insert 21 is provided with a lower protrusion 212 below the upper protrusion 221 to abut against the upper protrusion 221. An elastic ejecting device 4 is connected below the discharge insert 22, and the elastic ejecting device 4 enables the discharge insert 22 to move up and down in the vertical direction. The elastic ejection device 4 includes a connecting plate 41, a lower die base 42 and a cushion block 43; the connecting plate 41 is tightly attached to the lower surface of the unloading insert 22, the cushion block 43 is tightly attached to the lower surface of the connecting plate 41, there are two cushion blocks 43 to balance the force, the lower die base 42 is tightly attached to the lower surface of the lower die base 42, the connecting plate 41, the cushion block 43 and the lower die base 42 are fastened and connected by bolts and pins, there are four bolts and four pins each, and each cushion block is connected with two bolts and two pins. The connecting plate 41 is connected with a limit screw 44, the threaded end of the limit screw 44 is connected to the connecting plate 41, the bolt head end of the limit screw 44 is suspended on one side of the connecting plate 41, and the connecting plate 41 is provided with a countersunk hole 411 for accommodating the limit screw 44. The function of the limit screw 44 is to limit the height of the connecting plate 41 being pushed up, so as to prevent the connecting plate 41 from being pushed up too high and affecting the stamping process. The distance between the bolt end of the limit screw 44 and the end face of the countersunk hole is the movable distance of the connecting plate 41. The upper surface of the lower die base 42 is fixedly connected with a nitrogen spring 45, the number of which is 2. The ejection end of the nitrogen spring 45 passes through the connecting plate 41 and is connected to the lower surface of the unloading insert 22. The lower end of the swing fixed block 3 is fixedly connected to the upper surface of the lower die base 42 by a screw.

[0028] In this embodiment, further, the unloading insert 22 is provided with a bending insert 23 at the other end opposite to the swinging insert 21, and the bending insert 23 is fixedly connected to the connecting plate 41 by three screws. A bend is provided on the upper surface of the bending insert 23, and the molding surface of the mold is provided on the upper surface of the bending insert 23 and a second bending angle 231 is provided. The bending insert 23 can also be replaced when damaged.

[0029] In this embodiment, further, an upper die holder 6 is fixedly connected to the upper surface of the punch 1, the upper end of the upper die holder 6 is connected to the connection end of the press, the lower surface of the punch 1 is in contact with the molding surface of the die 2, and the punch 1 is provided with a molding cavity 11 for accommodating a workpiece on both sides of the bending direction, and a side panel 24 is tightly provided on the outer side of the molding cavity 11, and the side panel 24 is fixedly connected to the die 2. The side panel 24 is fixedly connected with a stripping hook 5 on both sides of the bending direction, and one end of the hook of the stripping hook 5 is tightly attached to the inner side of the molding cavity 11. The number of the stripping hooks 5 is 5. In the process of the punch 1 moving upward after completing the stamping, the molded workpiece clamped on the punch 1 moves upward with the punch 1, and then hits the hook end of the hook 5 and falls off the punch 1, completing the stripping process. A positioning plate 9 is connected to both ends of the upper surface of the die 1. The positioning plates 9 are adjustably connected to both end sides of the forming cavity 11. The relative distance of the positioning plates 9 can be adjusted by screws to adapt to different lengths of pre-bent workpieces.

[0030] The working principle and use process of this utility model:

[0031] The mold is assembled and debugged, and then installed in a corresponding press. The swing angle θ of the swing insert 21 is preset according to the required bending angle of different materials and the corresponding springback angle.

[0032] First, the pre-bent workpiece, a long metal strip, is placed between the two positioning plates 9, and the distance is adjusted to adapt to the length of the pre-bent workpiece.

[0033] Secondly, start the press, the punch 1 is driven downward by the press, and drives the pre-bent workpiece into the die 2, the pre-bent workpiece presses the connecting plate 41 in a naturally top-up state to move downward, and the upper protrusion 221 on the unloading insert 22 presses the lower protrusion 212 below, and drives the swing insert 21 to swing, the pre-bent workpiece completes the bending process at the first bending angle 33 and the second bending angle 231, and the stamping is completed.

[0034] Third, the punch 1 moves upward, and the bent workpiece is clamped on the punch 1 due to the swing insert 21 and moves upward with the punch 1. During the upward movement of the bent workpiece, the unloading insert 22 is pushed up, and the upper protrusion 221 moves upward accordingly. The swing insert 21 is pulled by the return spring 7 due to the release of the lower protrusion 212 and returns to its original position. The workpiece is unloaded by the unloading hook 5 during the rising process, and the unloading is completed.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An insert-type swing bending forming die, comprising a male die (1) and a female die (2), characterized in that: The die (2) comprises a swing insert (21), the swing insert (21) being rotatably connected to a swing fixed block (3), the swing insert (21) being provided with a rotating shaft (211), the axis of the rotating shaft (211) being parallel to a molding surface of the swing insert (21), the swing fixed block (3) being provided with an insert seat (31) for accommodating the swing insert (21) and a hole seat (32) cooperating with the rotating shaft (211), a swing angle θ being provided between the swing fixed block (3) and the swing insert (21), the swing fixed block (3) being provided with a first bending angle (33), and force projection surfaces of the rotating shaft (211) and the first bending angle (33) being staggered with each other.

2. The insert-type swing bending forming die according to claim 1, characterized in that: The swing insert (21) is provided with a discharge insert (22) on its side, the upper surface of the discharge insert (22) being the molding surface of the mold, the discharge insert (22) is provided with an upper protrusion (221) at a position connected with the swing insert (21), the swing insert (21) is provided with a lower protrusion (212) below the upper protrusion (221) and abutting against the upper protrusion (221), and an elastic ejection device (4) is connected below the discharge insert (22), and the elastic ejection device (4) enables the discharge insert (22) to move up and down in the vertical direction.

3. The insert-type swing bending forming die according to claim 2, characterized in that: The elastic ejecting device (4) comprises a connecting plate (41), a lower die base (42) and a cushion block (43); The connecting plate (41) is in close contact with the lower surface of the unloading insert (22); the cushion block (43) is in close contact with the lower surface of the connecting plate (41); the lower die base (42) is in close contact with the lower surface of the lower die base (42); the connecting plate (41), the cushion block (43) and the lower die base (42) are fastened and connected by bolts and pins; a limiting screw rod (44) is connected to the connecting plate (41); a threaded end of the limiting screw rod (44) is connected to the connecting plate (41); The bolt head end of the limit screw (44) is suspended on one side of the connecting plate (41); the connecting plate (41) is provided with a countersunk hole (411) for accommodating the limit screw (44); a nitrogen spring (45) is fixedly connected to the upper surface of the lower die base (42); the ejection end of the nitrogen spring (45) passes through the connecting plate (41) and is abutted against the lower surface of the unloading insert (22); and the lower end of the swing fixed block (3) is fixedly connected to the upper surface of the lower die base (42).

4. The insert-type swing bending forming die according to claim 3, characterized in that: The unloading insert (22) is provided with a bending insert (23) at the other end opposite to the swing insert (21); the bending insert (23) is fixedly connected to the connecting plate (41); a bend is provided on the upper surface of the bending insert (23); and a molding surface of the mold is provided on the upper surface of the bending insert (23) and has a second bending angle (231).

5. The insert-type swing bending forming die according to claim 4, characterized in that: The lower surface of the male mold (1) is in contact with the molding surface of the female mold (2); the male mold (1) is provided with molding cavities (11) for accommodating workpieces on both sides in the bending direction; side panels (24) are tightly arranged on the outer side of the molding cavity (11); and the side panels (24) are fixedly connected to the female mold (2).

6. The insert-type swing bending forming die according to claim 5, characterized in that: The side panel (24) is fixedly connected with a stripping hook (5) on both sides in the bending direction, and one end of the stripping hook (5) is in close contact with the inner side surface of the molding cavity (11).

7. The insert-type swing bending forming die according to claim 6, characterized in that: A reset bolt (8) is connected to the vertical end surface of the swing insert (21), the reset bolt (8) is perpendicular to the swing insert (21), the reset bolt (8) passes through the swing fixed block (3), the swing fixed block (3) is provided with a reset hole (34) for accommodating the reset bolt (8), and a reset spring (7) is connected between the bolt head of the reset bolt (8) and the outer side surface of the swing fixed block (3).

8. The insert-type swing bending forming die according to claim 7, characterized in that: Two ends of the upper surface of the female mold (2) are respectively connected to a positioning plate (9), and the positioning plates (9) are adjustably connected to the two end sides of the molding cavity (11).

9. The insert-type swing bending forming die according to any one of claims 1 to 8, characterized in that: An upper die seat (6) is fixedly connected to the upper surface of the male die (1).

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