U-shaped spring bolt forging and bending device

Abstract

The invention discloses a U-shaped spring bolt forging and bending device and method, and relates to the technical field of U-shaped spring bolt forging and bending forming, the bending device is used for bending a workpiece, the bending device comprises a support, a conveying device, a forming device and a material taking mechanical arm, the conveying device is connected with the support, and the forming device is connected with the support; the material taking manipulator is located on the fastening side of the support, and the conveying device is used for positioning the middle face of the workpiece. The support serves as a main installation foundation and is used for installing other devices, workpieces are automatically fed through the conveying device, the circumferences of the two ends of the workpieces are all round base planes, the middle of the two base planes is a middle plane, in the feeding process, the base planes of the workpieces are positioned, and the workpiece surfaces of the workpieces are recognized; the workpiece is bent and formed through the forming device, the bent and formed workpiece is in a symmetrical state, after forming is completed, the workpiece is taken out through the material taking mechanical arm, and continuous machining is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of forging and bending of a U-shaped lock tongue, in particular to a device and method for forging and bending a U-shaped lock tongue. Background Art

[0002] In recent years, with the continuous advancement of automated processing, more and more automated equipment has been used in traditional machining industries, greatly improving production efficiency.

[0003] The U-shaped lock is a special lock structure, suitable for larger devices, with greater strength, but more difficult to produce. The workpiece for forging the U-shaped lock tongue is a rod, and the two ends are in an uneven state during the previous cutting process. Therefore, the conventional forging and bending device cannot accurately position the workpiece to ensure the bending accuracy. It is often necessary to retain a large processing allowance, and after the processing is completed, the excess parts need to be cut off, which increases the processing difficulty and processing costs. Summary of the invention

[0004] The object of the present invention is to provide a U-shaped lock tongue forging bending device and method to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A U-shaped lock tongue forging and bending device, the bending device is used to bend a workpiece, the bending device includes a bracket, a conveying device, a forming device and a material taking manipulator, the conveying device is connected to the bracket, the forming device is connected to the bracket, the material taking manipulator is located on the fastening side of the bracket, and the conveying device is used to position the middle surface of the workpiece.

[0007] The bracket serves as the main installation base for installing other devices. The workpiece is automatically loaded through the conveying device. The circumferences of the two ends of the workpiece are full circles as the base surface, and the middle of the two base surfaces is the middle surface. During the loading process, the base surface of the workpiece is positioned and the workpiece surface of the workpiece is identified. The workpiece is bent and formed by the forming device, and the bent and formed workpiece is made symmetrical. After the forming is completed, the workpiece is taken out by the material-retrieving robot to facilitate continuous processing.

[0008] Furthermore, the conveying device includes a driving motor, conveying rollers and a centering component, which is connected to a bracket, a centering groove is provided on the bracket, and the centering component includes two transmission seats, which are slidingly connected to the transmission seat and the centering groove, a transmission groove is provided on the transmission seat, and driving motors are respectively provided on both sides of the transmission seat, and a number of conveying rollers are provided in the transmission groove, and the several conveying rollers in the transmission groove are arranged into two groups arranged symmetrically, and the driving motor is transmission-connected to an adjacent group of conveying rollers.

[0009] The driving motor, as the main power component of the conveying device, is fixed on the transmission seat. The driving motor can drive the sprocket, and drive a set of conveying rollers to rotate through chain drive. Two sets of conveying rollers are arranged in each centering groove. During the rotation of the conveying rollers, the workpiece is driven forward to achieve automatic feeding. After the feeding is completed, the two transmission seats move away from each other to disengage from the workpiece, facilitating the bending operation and avoiding motion interference.

[0010] Furthermore, the conveying device further includes a positioning component. A rotary groove is provided at the feeding port of the transmission seat, and the positioning component is placed in the rotary groove. The positioning component includes a rotary motor, a push rod, a coil, a compression spring, and a rotary seat ring. The rotary motor is placed in the rotary groove. The outer ring of the rotary seat ring is provided with an external tooth surface, and the output end of the rotary motor is provided with a gear. The rotary motor is meshed with the external tooth surface through the gear. The rotary seat ring is rotationally connected to the rotary groove. The rotary seat ring is provided with a positioning groove, and the coil is placed in the positioning groove. One end of the push rod is inserted into the positioning groove, and the push rod is slidably connected to the positioning groove. One side of the push rod close to the positioning groove abuts against the wall surface of the positioning groove through the compression spring. The coil is located outside the push rod, and the end of the push rod away from the positioning groove abuts against the outer circle of the workpiece.

[0011] A rotary groove is provided on the transmission seat close to the feeding direction. The rotary groove is arranged along the outer circle of the workpiece feeding direction. The push rod is made of magnetic material. When the workpiece is fed, the front end will first contact the push rod. Under the elastic force of the compression spring, the push rod abuts against the outer circle of the workpiece. The axis of the rotary seat ring is collinear with the axis of the workpiece. The gear is driven to rotate by the rotary motor, and the gear is meshed with the external tooth surface, thereby driving the rotary seat ring to perform fixed-axis rotation along the rotary groove. Since the cross-section of the workpiece is an uneven surface during the previous processing, when the push rod performs fixed-axis rotation and abuts against the uneven outer circle surface, it will drive the push rod to move along the positioning groove, causing the coil to cut the magnetic induction line outside the push rod and generating an induced current. The driving motor is controlled to drive the conveying rollers to continue rotating, driving the workpiece forward until the push rod rotates around the outer circle of the workpiece for one week without current fluctuation, and this position is determined as the first reference plane. After that, the driving motor drives the conveying rollers to rotate continuously, thereby driving the workpiece to perform uniform feeding until the second reference plane is confirmed. Based on the time difference between the confirmation of the two reference planes and the feeding speed of the workpiece driven by the conveying rollers, the length of the workpiece is determined, which is convenient for determining the middle surface of the workpiece.

[0012] Furthermore, the push rod is arranged obliquely.

[0013] The center line of the push rod does not intersect with the axis of the workpiece. By arranging the push rod obliquely, with the contact point with the workpiece as the origin, the inclination direction is the same as the fixed-axis rotation direction of the push rod.

[0014] Further, the forming device includes a forming roller and a forging cylinder. A fixed rotation groove is provided on the bracket. The lower end of the forming roller is inserted into the fixed rotation groove. There are two forging cylinders, and the two forging cylinders are fixedly connected to the bracket. A pressing wheel is provided at the output end of the forging cylinder. The two pressing wheels are symmetrically arranged with respect to the forming roller. The centering assembly further includes a centering motor, a bidirectional lead screw, and nuts. The centering motor is placed in the centering groove. The output end of the centering motor is fixedly connected to the bidirectional lead screw. Both ends of the bidirectional lead screw are rotatably connected to the centering groove. There are two thread surfaces with opposite helix directions on the bidirectional lead screw. There are two nuts, and the two nuts are respectively threadedly connected to the two reverse threads of the bidirectional lead screw. One side of each of the two nuts is fixedly connected to the adjacent transmission seat.

[0015] The output end of the forging cylinder is used to drive the pressing wheel to move. The pressing wheel can rotate about a fixed axis along the output end of the forging cylinder. After the two base surfaces and the middle surface of the workpiece are confirmed, the workpiece is driven to move forward continuously by the conveying roller until the middle surface moves to contact the side of the forming roller. The two forging cylinders output displacement, so that the two pressing wheels are tightly attached to both sides of the middle surface of the workpiece. At this time, the centering motor is driven to rotate the bidirectional lead screw. The two threads with opposite helix directions on the bidirectional lead screw are used to drive the two nuts to move linearly, so as to drive the two transmission seats to move in opposite directions until they are not in contact with the workpiece, avoiding movement interference during subsequent bending.

[0016] Further, the coil is electrically connected to the driving motor;

[0017] During bending: The side of the forming roller and the middle surface of the workpiece are in the same plane.

[0018] When determining the first base surface on the workpiece, the current signal on the coil is cut off. At this time, the electronic control system on the driving motor starts automatic timing until a current signal is generated again on the coil, that is, the second base surface of the workpiece is determined. The electronic control system determines the length of the workpiece between the two base surfaces according to the driving speed and time of the driving motor, which is convenient for determining the middle surface. After determining the middle surface, the driving motor automatically outputs a certain power according to the length of the workpiece to ensure that the distance from the middle surface of the workpiece to the two transmission seats is the same and in contact with the side of the forming roller. At this time, the vertical line where the contact point is located and the middle surface are on the same straight line, which is convenient for the two pressing wheels to apply force at both ends for rolling forming and ensure the forming accuracy.

[0019] As an optimization, the forming device further includes two auxiliary guide wheels. The two auxiliary guide wheels are sleeved on the outer ring of the forming roller. The two auxiliary guide wheels are in friction drive with the workpiece. The forming roller is rotatably connected to the fixed rotation groove. By setting the auxiliary guide wheels, when the workpiece contacts the two auxiliary guide wheels, the auxiliary guide wheels are driven to rotate through friction drive, thereby driving the forming roller to rotate about a fixed axis. That is, when bending the workpiece, the stress point is an outer circular surface at the height of the forming roller here, avoiding single stress and contact points, causing deformation of the forming roller and affecting its service life.

[0020] As an optimization, the forming device further includes a material discharging motor, which is placed in the fixed rotation groove. By setting the material discharging motor, after bending and forming, the two forging cylinders drive the crimping wheels to disengage from the workpiece surface, and the material discharging motor drives the forming roller to rotate, so that the bent part faces the material taking manipulator, facilitating automatic material taking and improving the continuous processing efficiency.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: When the workpiece is fed, the front end will first contact the ejector rod. Under the elastic force of the pressing spring, the ejector rod abuts against the outer circle of the workpiece, and the axis of the rotary seat ring is collinear with the axis of the workpiece. The rotary motor drives the gear to rotate, and the gear meshes with the external tooth surface, thereby driving the rotary seat ring to rotate around the rotary groove. Since the cross-section of the workpiece is an uneven surface during the previous processing, when the ejector rod rotates around the fixed axis and abuts against the uneven outer circle surface, it will drive the ejector rod to move along the positioning groove, causing the coil to cut the magnetic induction line on the outer circle of the ejector rod and generating an induced current. Control the driving motor to drive the conveying roller to continue rotating, driving the workpiece to move forward until the ejector rod rotates around the outer circle of the workpiece for one week without current fluctuation, and determine that this is the first base surface; thereafter, the driving motor drives the conveying roller to continue rotating, thereby driving the workpiece to be fed at a constant speed until the second base surface is confirmed. Determine the length of the workpiece based on the time difference between the two confirmed base surfaces and the feeding speed of the workpiece driven by the conveying roller, which is convenient for determining the middle surface of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the overall structural schematic diagram of the present invention;

[0023] Figure 2 is Figure 1 the partial enlarged view of A in the view;

[0024] Figure 3 is the structural schematic diagram of the workpiece base surface positioning of the present invention;

[0025] Figure 4 is Figure 3 the partial enlarged view of B in the view;

[0026] Figure 5 is the structural schematic diagram of the centering component of the present invention;

[0027] Figure 6 is the structural schematic diagram of the material taking power transmission of the present invention.

[0028] In the figure: 1. Bracket; 11. Centering groove; 12. Fixed-rotation groove; 2. Conveying device; 21. Positioning assembly; 211. Rotary motor; 212. Ejector rod; 213. Coil; 214. Compression spring; 215. Rotary seat ring; 2151. Positioning groove; 2152. Outer tooth surface; 22. Conveying roller; 23. Centering assembly; 231. Centering motor; 232. Bi-directional lead screw; 233. Nut; 234. Driving seat; 2341. Driving groove; 2342. Rotary groove; 24. Driving motor; 3. Forming device; 31. Forming roller; 32. Unloading motor; 33. Crimping wheel; 34. Forging cylinder; 35. Auxiliary guide wheel; 4. Material-taking manipulator. Detailed implementation manners

[0029] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Embodiment: As Figures 1 - 6 shown, the present invention provides a U-shaped lock tongue forging and bending device and method technical solution:

[0031] A U-shaped lock tongue forging and bending device, the bending device is used for bending a workpiece. The bending device includes a bracket 1, a conveying device 2, a forming device 3 and a material-taking manipulator 4. The conveying device 2 is connected to the bracket 1, the forming device 3 is connected to the bracket 1, the material-taking manipulator 4 is located on one side of the bracket 1, and the conveying device 2 is used for positioning the middle surface of the workpiece.

[0032] The bracket 1 serves as the main installation foundation for installing other devices. The workpiece is automatically loaded through the conveying device 2. The circumferences at both ends of the workpiece are complete circles as the base surfaces, and the middle between the two base surfaces is the middle surface. During the loading process, the base surfaces of the workpiece are positioned, and the workpiece surface of the workpiece is identified. The workpiece is bent and formed through the forming device 3, and the bent and formed workpiece is in a symmetrical state. After the forming is completed, the workpiece is taken out by the material-taking manipulator 4 for continuous processing.

[0033] Further, the conveying device 2 includes a driving motor 24, conveying rollers 22 and a centering assembly 23. The centering assembly 23 is connected to the bracket 1. A centering groove 11 is provided on the bracket 1. The centering assembly 23 includes two driving seats 234. The driving seats 234 are slidably connected to the centering groove 11. A driving groove 2341 is provided on the driving seats 234. Driving motors 24 are respectively provided on both sides of the driving seats 234. A plurality of conveying rollers 22 are provided in the driving groove 2341. The plurality of conveying rollers 22 in the driving groove 2341 are arranged in two groups in a symmetrical manner. The driving motor 24 is in transmission connection with an adjacent group of conveying rollers 22.

[0034] The driving motor 24, as the main power component of the conveying device 2, is fixed on the transmission seat 234. The driving motor 24 can drive the sprocket, and drive a set of conveying rollers 22 to rotate through chain drive. Two sets of conveying rollers 22 are arranged in each centering groove 11. During the rotation of the conveying rollers 22, the workpiece is driven to move forward, so as to realize automatic feeding. After the feeding is completed, the two transmission seats 234 move away from each other, so as to disengage from the workpiece, which is convenient for bending operation and avoids motion interference.

[0035] Further, the conveying device 2 further includes a positioning assembly 21. A rotary groove 2342 is provided at the feeding port of the transmission seat 234. The positioning assembly 21 is placed in the rotary groove 2342. The positioning assembly 21 includes a rotary motor 211, a ejector rod 212, a coil 213, a compression spring 214 and a rotary seat ring 215. The rotary motor 211 is placed in the rotary groove 2342. An external tooth surface 2152 is provided on the outer ring of the rotary seat ring 215. A gear is provided at the output end of the rotary motor 211. The rotary motor 211 is meshed with the external tooth surface 2152 through the gear. The rotary seat ring 215 is rotatably connected with the rotary groove 2342. A positioning groove 2151 is provided on the rotary seat ring 215. The coil 213 is placed in the positioning groove 2151. One end of the ejector rod 212 is inserted into the positioning groove 2151. The ejector rod 212 is slidably connected with the positioning groove 2151. One side of the ejector rod 212 close to the positioning groove 2151 abuts against the wall surface of the positioning groove 2151 through the compression spring 214. The coil 213 is located outside the ejector rod 212. One end of the ejector rod 212 far from the positioning groove 2151 abuts against the outer circle of the workpiece.

[0036] A rotary groove 2342 is provided on the transmission seat 234 close to the feeding direction. The rotary groove 2342 is arranged along the outer circle in the workpiece feeding direction. The ejector rod 212 is made of magnetic material. When the workpiece feeds, the front end will first contact the ejector rod 212. Under the elastic force of the compression spring 214, the ejector rod 212 abuts against the outer circle of the workpiece. The axis of the rotary seat ring 215 is collinear with the axis of the workpiece. The rotary motor 211 drives the gear to rotate. The gear is meshed with the external tooth surface 2152, so as to drive the rotary seat ring 215 to rotate around a fixed axis along the rotary groove 2342. Since the cross section of the workpiece is an uneven surface in the previous processing process, when the ejector rod 212 rotates around a fixed axis and abuts against the uneven outer circle surface, it will drive the ejector rod 212 to move along the positioning groove 2151, so that the coil 213 makes a cutting magnetic induction line movement outside the ejector rod 212 and generates an induced current. The driving motor 24 is controlled to drive the conveying rollers 22 to continue to rotate, driving the workpiece to move forward until the ejector rod 212 rotates around the outer circle of the workpiece for one week without current fluctuation, and it is determined that this place is the first base surface; Thereafter, the driving motor 24 drives the conveying rollers 22 to continue to rotate, so as to drive the workpiece to feed at a constant speed until the second base surface is confirmed. The length of the workpiece is determined by the time difference between the confirmation of the two base surfaces and the feeding speed of the workpiece driven by the conveying rollers 22, which is convenient for determining the middle surface of the workpiece.

[0037] Further, the ejector rod 212 is arranged obliquely.

[0038] The central axis of the ejector rod 212 and the axis of the workpiece do not intersect. By arranging the ejector rod 212 obliquely, with the contact point with the workpiece as the origin, the inclined direction is the same as the fixed-axis rotation direction of the ejector rod 212.

[0039] Further, the forming device 3 includes a forming roller 31 and a forging cylinder 34. A fixed-rotation groove 12 is provided on the bracket 1. The lower end of the forming roller 31 is inserted into the fixed-rotation groove 12. There are two forging cylinders 34, and the two forging cylinders 34 are fixedly connected to the bracket 1. A pressing wheel 33 is provided at the output end of the forging cylinder 34. The two pressing wheels 33 are symmetrically arranged with respect to the forming roller 31. The centering assembly 23 further includes a centering motor 231, a bidirectional lead screw 232, and nuts 233. The centering motor 231 is placed in the centering groove 11. The output end of the centering motor 231 is fixedly connected to the bidirectional lead screw 232. The two ends of the bidirectional lead screw 232 are rotatably connected to the centering groove 11. Two thread surfaces with opposite helix directions are provided on the bidirectional lead screw 232. There are two nuts 233, and the two nuts 233 are respectively threadedly connected to the two reverse threads of the bidirectional lead screw 232. One side of the two nuts 233 is respectively fixedly connected to the adjacent transmission seat 234.

[0040] The output end of the forging cylinder 34 is used to drive the pressing wheel 33 to move. The pressing wheel 33 can perform fixed-axis rotation along the output end of the forging cylinder 34. After confirming the two base surfaces and the middle surface of the workpiece, the workpiece is driven to continue to move forward by the conveying roller 22 until the middle surface moves to contact the side of the forming roller 31. The two forging cylinders 34 output displacements, so that the two pressing wheels 33 are pressed against both sides of the middle surface of the workpiece. At this time, the centering motor 231 is driven to rotate the bidirectional lead screw 232. The two threads with opposite helix directions on the bidirectional lead screw 232 are used to drive the two nuts 233 to perform linear movement, thereby driving the two transmission seats 234 to move in opposite directions until they do not contact the workpiece, avoiding movement interference during subsequent bending.

[0041] Further, the coil 213 is electrically connected to the driving motor 24;

[0042] During bending: The side of the forming roller 31 and the middle surface of the workpiece are in the same plane.

[0043] When determining the first reference plane on the workpiece, the current signal on the coil 213 is cut off. At this time, the electronic control system on the drive motor 24 starts automatic timing until a current signal is re-generated on the coil 213, that is, the second reference plane of the workpiece is determined. The electronic control system determines the length of the workpiece between the two reference planes according to the driving speed and time of the drive motor 24, which is convenient for determining the middle plane. After determining the middle plane, the drive motor 24 automatically outputs a certain power according to the length of the workpiece to ensure that the distances from the middle plane of the workpiece to the two transmission seats 234 are the same and it contacts the side of the forming roller 31. At this time, the vertical line where the contact point is located and the middle plane are on the same straight line, which is convenient for the two crimping wheels 33 to apply force at both ends for rolling forming to ensure the forming accuracy.

[0044] As an optimization, the forming device 3 further includes two auxiliary guide wheels 35. The two auxiliary guide wheels 35 are sleeved on the outer ring of the forming roller 31, and the two auxiliary guide wheels 35 are in frictional transmission with the workpiece. The forming roller 31 is rotationally connected to the fixed rotation groove 12. By setting the auxiliary guide wheels 35, when the workpiece contacts the two auxiliary guide wheels 35, through frictional transmission, the auxiliary guide wheels 35 are driven to rotate, thereby driving the forming roller 31 to rotate around a fixed axis. That is, when bending the workpiece, the force application point is an outer circular surface at the height of the forming roller 31 here, avoiding a single force application and contact point, causing deformation of the forming roller 31 and affecting its service life.

[0045] As an optimization, the forming device 3 further includes a blanking motor 32, and the blanking motor 32 is placed in the fixed rotation groove 12. By setting the blanking motor 32, after bending and forming, the two forging cylinders 34 drive the crimping wheels 33 to disengage from the surface of the workpiece. The blanking motor 32 drives the forming roller 31 to rotate, so that the bent part faces the picking manipulator, which is convenient for automatic picking and improves the continuous processing efficiency.

[0046] The bending method includes the following steps:

[0047] S1. Drive the conveying roller 22 to rotate through the drive motor 24. The bilaterally rotating conveying roller 22 is used to drive the workpiece to move forward;

[0048] S2. Determine the reference planes at both ends of the workpiece through the positioning assembly 21 respectively, and determine the middle plane of the workpiece according to the reference planes;

[0049] S3. After confirming the middle plane of the workpiece, according to the length of the workpiece, move the middle plane of the workpiece to the place where it contacts the forming roller 31. Output displacement through the forging cylinder 34, so that the two crimping wheels 33 press the workpiece tightly on the surface of the forming roller 31. At this time, output displacement through the centering motor 231, and sequentially drive through the bidirectional lead screw 232, the nut 233 and the transmission seat 234, so that the two transmission seats 234 move in opposite directions, thereby disengaging from the workpiece;

[0050] S4. After the transmission seat 234 and the workpiece are disengaged, the forging cylinder 34 continues to output displacement, causing the workpiece to be cold-pressed and formed along the outer circumference of the forming roller 31;

[0051] S5. After the workpiece is formed, the forging cylinder 34 drives the crimping wheel 33 to disengage from the surface of the workpiece, and the unloading motor 32 drives the formed workpiece to rotate. The formed workpiece is taken off from the forming roller 31 by the material taking manipulator 4, facilitating continuous processing.

[0052] The working principle of the present invention: When the workpiece is fed, the front end will first contact the ejector rod 212. Under the elastic force of the compression spring 214, the ejector rod 212 abuts against the outer circumference of the workpiece. The axis of the rotary seat ring 215 is collinear with the axis of the workpiece. The rotary motor 211 drives the gear to rotate, and the gear meshes with the external tooth surface 2152, thereby driving the rotary seat ring 215 to perform fixed-axis rotation along the rotary groove 2342. Since the cross-section of the workpiece is an uneven surface during the previous processing, when the ejector rod 212 rotates around a fixed axis and abuts against the uneven outer circumference surface, it will drive the ejector rod 212 to move along the positioning groove 2151, causing the coil 213 to perform a cutting magnetic induction line movement outside the ejector rod 212 and generating an induced current. The driving motor 24 is controlled to drive the conveying roller 22 to continue rotating, driving the workpiece to move forward until the ejector rod 212 rotates around the outer circumference of the workpiece for one week without current fluctuation, and this position is determined as the first reference plane; thereafter, the driving motor 24 drives the conveying roller 22 to continue rotating, thereby driving the workpiece to be fed at a constant speed until the second reference plane is confirmed. Based on the time difference between the two confirmed reference planes and the feeding speed of the workpiece driven by the conveying roller 22, the length of the workpiece is determined, facilitating the determination of the middle plane of the workpiece.

[0053] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A U-shaped lock tongue forging and bending device, which is used to bend workpieces, and is characterized in that: The bending device includes a bracket (1), a conveying device (2), a forming device (3), and a material-taking manipulator (4). The conveying device (2) is connected to the bracket (1), the forming device (3) is connected to the bracket (1), the material-taking manipulator (4) is located on one side of the bracket (1), and the conveying device (2) is used to position the middle surface of the workpiece.

2. The U-shaped lock tongue forging and bending device according to claim 1, characterized in that: The conveying device (2) includes a driving motor (24), conveying rollers (22), and a centering assembly (23). The centering assembly (23) is connected to the bracket (1). A centering groove (11) is provided on the bracket (1). The centering assembly (23) includes two transmission seats (234). The transmission seats (234) are slidably connected to the centering groove (11). A transmission groove (2341) is provided on the transmission seats (234). Driving motors (24) are respectively provided on both sides of the transmission seats (234). A number of conveying rollers (22) are provided in the transmission groove (2341). The several conveying rollers (22) in the transmission groove (2341) are arranged in two symmetrically arranged groups. The driving motor (24) is drivingly connected to an adjacent group of conveying rollers (22).

3. The U-shaped lock tongue forging and bending device according to claim 2, characterized in that: The conveying device (2) further includes a positioning assembly (21). A rotary groove (2342) is provided at the feed inlet of the transmission seat (234). The positioning assembly (21) is placed in the rotary groove (2342). The positioning assembly (21) includes a rotary motor (211), a top rod (212), a coil (213), a compression spring (214), and a rotary seat ring (215). The rotary motor (211) is placed in the rotary groove (2342). An external tooth surface (2152) is provided on the outer ring of the rotary seat ring (215). A gear is provided at the output end of the rotary motor (211). The rotary motor (211) is meshed with the external tooth surface (2152) through the gear. The rotary seat ring (215) is rotatably connected to the rotary groove (2342). A positioning groove (2151) is provided on the rotary seat ring (215). The coil (213) is placed in the positioning groove (2151). One end of the top rod (212) is inserted into the positioning groove (2151). The top rod (212) is slidably connected to the positioning groove (2151). One side of the top rod (212) close to the positioning groove (2151) abuts against the wall surface of the positioning groove (2151) through the compression spring (214). The coil (213) is located on the outer ring of the top rod (212). The end of the top rod (212) far from the positioning groove (2151) abuts against the outer circle of the workpiece.

4. A U-shaped lock tongue forging and bending device according to claim 3, characterized in that: The top rod (212) is arranged obliquely.

5. The U-shaped lock tongue forging and bending device according to claim 4, characterized in that: The forming device (3) includes a forming roller (31) and a forging cylinder (34). A fixed rotation groove (12) is provided on the bracket (1). The lower end of the forming roller (31) is inserted into the fixed rotation groove (12). There are two forging cylinders (34), and the two forging cylinders (34) are fixedly connected to the bracket (1). A crimping wheel (33) is provided at the output end of the forging cylinder (34). The two crimping wheels (33) are symmetrically arranged with respect to the forming roller (31). The centering assembly (23) further includes a centering motor (231), a bidirectional lead screw (232), and nuts (233). The centering motor (231) is placed in the centering groove (11). The output end of the centering motor (231) is fixedly connected to the bidirectional lead screw (232). The two ends of the bidirectional lead screw (232) are rotatably connected to the centering groove (11). Two thread surfaces with opposite helix directions are provided on the bidirectional lead screw (232). There are two nuts (233), and the two nuts (233) are respectively threadedly connected to the two reverse threads of the bidirectional lead screw (232). One side of each of the two nuts (233) is fixedly connected to the adjacent transmission seat (234).

6. The U-shaped lock tongue forging and bending device according to claim 5, characterized in that: The coil (213) is electrically connected to the drive motor (24); During bending: The side of the forming roller (31) and the middle surface of the workpiece are in the same plane.

7. A U-shaped lock tongue forging and bending device according to claim 6, characterized in that: The forming device (3) further includes two auxiliary guide wheels (35). The two auxiliary guide wheels (35) are sleeved on the outer ring of the forming roller (31). The two auxiliary guide wheels (35) are in frictional transmission with the workpiece. The forming roller (31) is rotatably connected to the fixed rotation groove (12).

8. A U-shaped lock tongue forging and bending device according to claim 7, characterized in that: The forming device (3) further includes a blanking motor (32). The blanking motor (32) is placed in the fixed rotation groove (12).

9. The bending method of a U-shaped lock tongue forging and bending device according to claim 8, characterized in that: The bending method includes the following steps: S1. The conveying roller (22) feeds the workpiece; S2. The positioning assembly (21) positions the end of the workpiece and identifies the middle surface; S3. The two crimping wheels (33) press the workpiece against the surface of the forming roller (31), and the two centering assemblies (23) move in the reverse direction and disengage from the workpiece; S4. The forging cylinder (34) continuously outputs displacement to press and form the workpiece; S5. The forging cylinder (34) drives the crimping wheel (33) to reset, and the blanking motor (32) drives the workpiece to rotate so that the bent part faces the picking manipulator (4) for automatic picking.

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