Bending mechanism for sheet metal part machining

Abstract

The utility model provides a bending mechanism for sheet metal part processing, which comprises a rack, an elastic jacking mechanism and a positioning mechanism, a hydraulic cylinder is fixed at the top of the rack, and the hydraulic cylinder is connected with a telescopic die pressure head; a bidirectional motor is arranged on one side of the outer wall of the rack, and a mold base is fixed to the lower portion of the rack. The elastic jacking mechanism is arranged in the mold base and located under the mold pressing head. The positioning mechanism is arranged at the bottom of the rack and located under the mold base. According to the utility model, the positioning mechanism ensures that the plane sheet metal part is placed accurately (left and right), so that the plane sheet metal part is positioned, and the quality of sheet metal products is improved; and meanwhile, the elastic jacking mechanism can automatically eject out the sheet metal part after bending is finished, automatic discharging is achieved, meanwhile, due to the effect of the limiting sliding block, the elastic jacking mechanism cannot be separated from the guide groove while ejecting out the sheet metal part after bending is finished, and reliability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of sheet metal processing, in particular to a bending mechanism for sheet metal processing. Background Art

[0002] Sheet metal has the characteristics of light weight, high strength, conductivity (can be used for electromagnetic shielding), low cost, good performance in large-scale mass production, etc. It has been widely used in the fields of electronics, communications, automobile industry, medical equipment, etc. For example, in computer cases and mobile phones, sheet metal is an indispensable component. Precision sheet metal processing includes traditional cutting, punching, bending and pressing methods and process parameters, various cold stamping die structures and process parameters, various equipment working principles and operation methods, and new stamping technology and new processes.

[0003] Sheet metal bending is a process of converting a flat sheet metal into a three-dimensional product by passing it through pressure equipment and molds. With the development of the times, the shapes of sheet metal products have become more diverse, which puts forward new requirements for sheet metal equipment and molds. At the same time, the quality of the bent sheet metal products is required to be higher. At present, in the process of bending small thin sheet metal, the existing technology has the following defects:

[0004] 1. Small sheet metal parts mostly rely on manual positioning during the bending process, and the positioning accuracy is not high, resulting in the quality of the final sheet metal products to be further improved.

[0005] 2. After the bending forming is completed, when the mold pressure head moves up, the formed sheet metal parts will often get stuck on the mold base, and the formed sheet metal parts need to be taken out manually, affecting production efficiency.

[0006] After searching, the Chinese utility model patent with the existing announcement number CN210907507U provides a sheet metal bending device, including a lower die base and a sheet metal body, the inner upper surface of the lower die base is provided with a molding cavity, a guide hole is provided at the lower middle part of the molding cavity, an elastic lifting device is installed inside the guide hole, and the upper end of the elastic lifting device extends to the interior of the molding cavity, rollers are installed on both sides of the upper surface of the molding cavity, and an upper die is provided above the molding cavity. The utility model installs rollers on both sides of the upper surface of the molding cavity, so that in the process of the sheet metal body being pressed down, its lower surface does not directly wear against the edges of the molding cavity, but rolls against the rollers, thereby reducing the wear of the sheet metal body. The utility model is provided with an elastic lifting device, which can automatically eject the sheet metal after the bending is completed, thereby realizing automatic discharging, and there is no need to manually take out the finished sheet metal, which is easy to operate.

[0007] Although the device has many beneficial effects, due to the increasingly higher requirements for the precision of existing sheet metal processing, rollers are installed on both sides of the upper surface of the forming cavity of the device, and no positioning mechanism is set, which leads to easy sliding and displacement during the bending process of the sheet metal parts, and cannot meet the requirements of high-precision processing. The quality of the final formed sheet metal products needs to be further improved; since the elastic lifting device in the device is not provided with a limiting mechanism, it is easy for the elastic lifting device to detach from the guide hole when the sheet metal parts are ejected after the bending is completed, and the reliability is not strong. Utility Model Content

[0008] The purpose of the utility model is to provide a bending mechanism for sheet metal processing to solve the problems raised in the above background technology.

[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0010] A bending mechanism for sheet metal processing, comprising:

[0011] A frame, a hydraulic cylinder is fixed on the top of the frame, and a retractable mold pressing head is connected to the hydraulic cylinder; a bidirectional motor is arranged on one side of the outer wall of the frame, and a mold base is fixed under the frame;

[0012] An elastic lifting mechanism, which is arranged inside the mold base and directly below the mold pressing head;

[0013] A positioning mechanism is arranged at the bottom of the frame and is located directly below the mold base. The end of the positioning mechanism and the bidirectional motor can transmit power.

[0014] Preferably, the top of the mold base has a molding cavity that is adapted to the shape of the bottom of the mold pressing head, and a guide groove is provided inside to accommodate an elastic lifting mechanism. The vertical center axis of the guide groove coincides with the vertical center axis of the mold pressing head above, and the bottom of the molding cavity is connected to the top of the guide groove.

[0015] Preferably, the cross-section of the molding cavity is in the shape of an inverted cone, and the molding cavity extends along the front-to-back direction of the mold base.

[0016] Preferably, the elastic lifting mechanism includes a top push head, a limiting slider connected to the push head, and a lifting spring connected to the bottom of the limiting slider, wherein the lifting spring is always in a compressed state, the diameter distance of the limiting slider is greater than the diameter distance of the connection part between the molding cavity and the guide groove, and the diameter distance of the push head is less than the diameter distance of the connection part between the molding cavity and the guide groove.

[0017] Preferably, the positioning mechanism includes a transmission gear located at the end thereof which is in meshing contact with the bidirectional motor, a bidirectional threaded screw which is socketed and fixed to the transmission gear, an L-shaped positioning plate located on both sides of the bidirectional threaded screw which is socketed by threads, and a rotating mounting seat which is fixed to the bottom of the frame and is simultaneously arranged on both sides of the bidirectional threaded screw; wherein the horizontal height of the top of the L-shaped positioning plate is higher than the horizontal height of the top surface of the mold base.

[0018] Preferably, there are two L-shaped positioning plates, which are respectively arranged on the left and right different direction thread sections of the bidirectional threaded screw.

[0019] Preferably, a rubber layer is fixed to the outer surface of the side plate of the L-shaped positioning plate.

[0020] Preferably, the rack is a square frame structure with a base formed at the bottom.

[0021] Compared with the prior art, the utility model provides a bending mechanism for sheet metal processing, which has the following beneficial effects:

[0022] 1. The utility model discloses a bending mechanism for sheet metal processing, which drives the positioning mechanism to work by starting a bidirectional motor, so that the two L-shaped positioning plates are simultaneously moved toward the middle of the mold base until the sheet metal to be bent is just above the mold base. Since a rubber layer is fixed to the outer surface of the side plate of the L-shaped positioning plate, the L-shaped positioning plate will not cause wear and damage to the edge of the sheet metal to be bent. The positioning mechanism can ensure that the (left and right) position of the flat sheet metal is accurately placed when the sheet metal is bent, thereby realizing the positioning of the flat sheet metal, so that the quality of the finally formed sheet metal product is higher and the sheet metal bending efficiency is improved.

[0023] 2. When the sheet metal is bent, since the elastic lifting mechanism is arranged inside the mold base, the lifting spring is always in a compressed state, the diameter distance of the limit slider is greater than the diameter distance of the connection between the forming cavity and the guide groove, and the diameter distance of the ejector head is less than the diameter distance of the connection between the forming cavity and the guide groove, so that the limit slider can always slide inside the guide groove, and the ejector head will automatically eject the sheet metal after the bending is completed due to the upward force of the bottom lifting spring, so as to realize automatic discharging. At the same time, due to the action of the limit slider, the elastic lifting mechanism will not be separated from the guide groove when ejecting the sheet metal after the bending is completed, and the reliability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the elastic lifting mechanism of the utility model;

[0026] Figure 3 This is a schematic plan view of the positioning mechanism structure of the utility model;

[0027] Figure 4 It is a schematic diagram of the working process of the utility model.

[0028] In the figure: 1. frame; 2. hydraulic cylinder; 3. mold pressure head; 4. bidirectional motor; 5. mold base; 51. molding cavity; 52. guide groove; 6. elastic lifting mechanism; 61. ejector head; 62. limit slider; 63. lifting spring; 7. positioning mechanism; 71. transmission gear; 72. rotating mounting seat; 73. bidirectional threaded screw; 74. L-shaped positioning plate. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Example:

[0031] See also Figures 1 to 4 The utility model provides a technical solution for a bending mechanism for sheet metal processing:

[0032] A bending mechanism for sheet metal processing, comprising a frame 1, the frame 1 is a square frame structure, a base is formed at the bottom, a hydraulic cylinder 2 is fixed on the top of the frame 1, a retractable die pressing head 3 is connected to the hydraulic cylinder 2, and a die base 5 is fixed to the base of the frame 1;

[0033] A bidirectional motor 4 is arranged on one side of the outer wall of the frame 1. The working principle of the bidirectional motor 4 is similar to that of the unidirectional motor, except that it has two electromagnetic coils, which can control the forward and reverse rotation of the motor according to different input signals. The bidirectional motor 4 is usually powered by a DC power supply, wherein each electromagnetic coil is connected to the power supply to form a magnetic field; when one coil is energized, a magnetic field is generated, and when the other coil is energized, a magnetic field in another direction is generated; by changing the polarity of the power supply, the direction and size of the magnetic field can be changed, thereby controlling the forward and reverse rotation of the motor;

[0034] An elastic lifting mechanism 6, wherein the elastic lifting mechanism 6 is arranged inside the mold base 5; the number of the elastic lifting mechanism 6 may be one or more, depending on the actual length of the mold base 5. When the number is one, the elastic lifting mechanism 6 may be arranged at the center of the mold base 5; when the number is more than one, the elastic lifting mechanism 6 may be evenly arranged inside the mold base 5 at equal intervals, and may always be located below the mold pressing head 3;

[0035] The positioning mechanism 7 is disposed at the bottom of the frame 1 and is located directly below the mold base 5 . The end of the positioning mechanism 7 and the bidirectional motor 4 can transmit power.

[0036] Specifically, the top of the mold base 5 has a molding cavity 51 that is adapted to the shape of the bottom of the mold pressing head 3, and is provided with a guide groove 52 inside that can accommodate the elastic lifting mechanism 6. The vertical center axis of the guide groove 52 coincides with the vertical center axis of the mold pressing head 3 above, and the bottom of the molding cavity 51 is connected to the top of the guide groove 52; the cross-section of the molding cavity 51 is an inverted cone, and the molding cavity 51 extends along the front and rear directions of the mold base 5.

[0037] Specifically, the elastic lifting mechanism 6 includes a top push head 61, a limiting slider 62 connected to the push head 61, and a lifting spring 63 connected to the bottom of the limiting slider 62, wherein the lifting spring 63 is always in a compressed state, the diameter distance of the limiting slider 62 is greater than the diameter distance of the connection between the molding cavity 51 and the guide groove 52, and the diameter distance of the push head 61 is less than the diameter distance of the connection between the molding cavity 51 and the guide groove 52.

[0038] Specifically, the positioning mechanism 7 includes a transmission gear 71 located at the end thereof and in meshing contact with the bidirectional motor 4, a bidirectional threaded screw 73 which is sleeved and fixed to the transmission gear 71, L-shaped positioning plates 74 which are located on both sides of the bidirectional threaded screw 73 and are sleeved by threads, and a rotating mounting seat 72 which is fixed to the bottom of the frame 1 and is also arranged on both sides of the bidirectional threaded screw 73; wherein, the horizontal height of the top of the L-shaped positioning plate 74 is higher than the horizontal height of the top surface of the mold base 5, and a rubber layer is fixed to the outer surface of the side plate of the L-shaped positioning plate 74; it should be noted that there are two L-shaped positioning plates 74, which are respectively arranged on the left and right different direction threaded sections of the bidirectional threaded screw 73. When the bidirectional threaded screw 73 rotates, it can drive the L-shaped positioning plate 74 which is sleeved by threads to realize movement in the left and right directions, and the movement directions of the two L-shaped positioning plates 74 are always opposite.

[0039] The specific implementation process is as follows:

[0040] S1. Before the sheet metal bending process is performed, the sheet metal to be processed is placed on the mold base, and the bidirectional motor 4 is started to drive the positioning mechanism 7 to work. The positioning mechanism 7 includes a transmission gear 71 at the end thereof meshing with the bidirectional motor 4, a bidirectional threaded screw 73 sleeved and fixed with the transmission gear 71, an L-shaped positioning plate 74 located on both sides of the bidirectional threaded screw 73 and sleeved by threads, and a rotating mounting seat 72 fixed to the bottom of the frame 1 and arranged on both sides of the bidirectional threaded screw 73. The horizontal height of the top of the L-shaped positioning plate 74 is higher than the horizontal height of the top surface of the mold base 5; at this time, the bidirectional The motor 4 drives the transmission gear 71 to rotate through meshing contact, and drives the bidirectional threaded screw 73 to start rotating. The two L-shaped positioning plates 74 simultaneously move toward the middle of the mold base 5 until the sheet metal to be bent is clamped just above the mold base 5. At the same time, a rubber layer is fixed to the outer surface of the side plate of the L-shaped positioning plate 74. The L-shaped positioning plate 74 will not cause wear and damage to the edge of the sheet metal to be bent. The positioning mechanism 7 can ensure that the (left and right) position of the flat sheet metal is accurately placed when the sheet metal is bent, thereby realizing the positioning of the flat sheet metal, so that the quality of the final formed sheet metal product is higher and the sheet metal bending efficiency is improved.

[0041] S2. When performing sheet metal bending processing, since the two L-shaped positioning plates 74 in the positioning mechanism 7 have clamped the sheet metal to be bent just above the mold base 5, the hydraulic cylinder 2 is started, and the mold ram 3 is driven to move downward to extrude the sheet metal. During the downward pressing process, the top head 61 located below the sheet metal is forced to move downward until the sheet metal is formed into a qualified sheet metal product under the action of the mold ram 3.

[0042] S3. When the sheet metal is bent, the elastic lifting mechanism 6 arranged inside the mold base 5 includes a top jack 61, a limiting slider 62 connected to the jack 61, and a lifting spring 63 connected to the bottom of the limiting slider 62, wherein the lifting spring 63 is always in a compressed state, the diameter distance of the limiting slider 62 is greater than the diameter distance of the connection between the forming cavity 51 and the guide groove 52, and the diameter distance of the jack 61 is less than the diameter distance of the connection between the forming cavity 51 and the guide groove 52, so that the limiting slider 62 can always slide inside the guide groove 52, and the jack 61 is subjected to the upward force of the bottom lifting spring 63, and will automatically eject the sheet metal after the bending is completed, thereby realizing automatic discharging. At the same time, due to the action of the limiting slider 62, the elastic lifting mechanism 6 will not be separated from the guide groove 52 while ejecting the sheet metal after the bending is completed, and has strong reliability.

[0043] The remaining undescribed parts of the present invention may be the same as the prior art, or are well-known technologies, or may be implemented by using the prior art, and will not be described in detail herein.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bending mechanism for sheet metal processing, characterized in that: include: A frame (1), a hydraulic cylinder (2) is fixed on the top of the frame (1), and the hydraulic cylinder (2) is connected to a retractable mold pressing head (3); a bidirectional motor (4) is arranged on one side of the outer wall of the frame (1), and a mold base (5) is fixed below the frame (1); An elastic lifting mechanism (6), wherein the elastic lifting mechanism (6) is arranged inside the mold base (5) and is located directly below the mold pressing head (3); A positioning mechanism (7), wherein the positioning mechanism (7) is arranged at the bottom of the frame (1) and is located directly below the mold base (5); the end of the positioning mechanism (7) and the bidirectional motor (4) can transmit power.

2. A bending mechanism for sheet metal processing according to claim 1, characterized in that: The top of the mold base (5) has a molding cavity (51) that matches the shape of the bottom of the mold pressing head (3), and a guide groove (52) that can accommodate the elastic lifting mechanism (6) is provided inside. The vertical center axis of the guide groove (52) coincides with the vertical center axis of the mold pressing head (3) above, and the bottom of the molding cavity (51) is connected to the top of the guide groove (52).

3. A bending mechanism for sheet metal processing according to claim 2, characterized in that: The cross section of the molding cavity (51) is in the shape of an inverted cone, and the molding cavity (51) extends along the front-rear direction of the mold base (5).

4. A bending mechanism for sheet metal processing according to claim 3, characterized in that: The elastic lifting mechanism (6) comprises a top push head (61), a limiting slider (62) connected to the push head (61), and a lifting spring (63) connected to the bottom of the limiting slider (62), wherein the lifting spring (63) is always in a compressed state, the diameter distance of the limiting slider (62) is greater than the diameter distance of the connection part between the molding cavity (51) and the guide groove (52), and the diameter distance of the push head (61) is less than the diameter distance of the connection part between the molding cavity (51) and the guide groove (52).

5. The bending mechanism for sheet metal processing according to claim 1, characterized in that: The positioning mechanism (7) comprises a transmission gear (71) whose end is in meshing contact with the bidirectional motor (4), a bidirectional threaded screw (73) which is sleeved and fixed to the transmission gear (71), an L-shaped positioning plate (74) which is sleeved on both sides of the bidirectional threaded screw (73) through threads, and a rotating mounting seat (72) which is fixed to the bottom of the frame (1) and is arranged on both sides of the bidirectional threaded screw (73); wherein the horizontal height of the top of the L-shaped positioning plate (74) is higher than the horizontal height of the top surface of the mold base (5).

6. A bending mechanism for sheet metal processing according to claim 5, characterized in that: There are two L-shaped positioning plates (74), which are respectively arranged on the left and right different direction thread sections of the bidirectional threaded screw rod (73).

7. A bending mechanism for sheet metal processing according to claim 6, characterized in that: A rubber layer is fixed on the outer surface of the side plate of the L-shaped positioning plate (74).

8. The bending mechanism for sheet metal processing according to claim 1, characterized in that: The frame (1) is a square frame structure, with a base formed at the bottom.

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