A bending device for automobile sheet metal part production

Abstract

The application relates to the technical field of metal stamping, in particular to a bending device for automobile sheet metal part production. The automobile sheet metal part after multistage bending is prone to being clamped on a bending head, affecting discharging, and scratches and abrasion may occur between the bent part and the automobile sheet metal part, affecting the bending quality; and the automobile sheet metal part may deviate during bending, leading to unstable bending, affecting precision, and leading to poor bending effect. The bending device for automobile sheet metal part production comprises an outer frame, and an automobile sheet metal part is arranged in the middle of the outer frame. The automobile sheet metal part is positioned by extruding the automobile sheet metal part through a positioning frame, the bending accuracy is improved, and the bending effect is enhanced; the bending head, the bending pipe and the resisting block are alternately matched to gradually extrude the automobile sheet metal part for smooth twice bending, the bending speed is prevented from being affected by secondary positioning, and the bending efficiency is improved; the top of the resisting block is separated from the automobile sheet metal part, the contact area and the friction force are reduced, and the operator is facilitated to take out the bent automobile sheet metal part.

Description

Technical Field

[0001] This invention relates to the field of metal stamping technology, and more particularly to a bending device for the production of automotive sheet metal parts. Background Technology

[0002] Automotive sheet metal parts are metal components that make up the exterior or interior of a car. They are usually made of materials such as steel or aluminum sheets and are manufactured through processes such as stamping, welding, and bending. Bending automotive sheet metal parts involves using mechanical equipment to bend the sheet metal parts a different number of times according to design requirements to form the desired shape. In order to reduce the number of positioning steps during bending, existing methods usually use a smooth multi-stage bending process to bend the automotive sheet metal parts in one step. This avoids wasting time on multiple positioning steps, reduces the probability of inaccurate positioning, and improves bending efficiency.

[0003] Because multi-stage bending of automotive sheet metal parts can easily cause them to get stuck due to high friction with the bending head, existing methods do not readily reduce friction by decreasing the contact area between the bending head and the sheet metal parts after bending. This makes it inconvenient for operators to remove the sheet metal parts, affecting material output. Furthermore, the rigid contact can easily lead to varying degrees of scratches and wear between the bent parts and the sheet metal parts, resulting in poor bending quality. Additionally, the sheet metal parts may shift during bending, and existing methods do not readily hold the sheet metal parts in place during bending, leading to unstable bending, affecting bending accuracy, and ultimately resulting in poor bending performance. Summary of the Invention

[0004] To overcome the above-mentioned shortcomings, the present invention provides a bending device for automotive sheet metal production, which can reduce the friction between the bending head and the automotive sheet metal after bending, facilitating material discharge; reduce wear between the bent part and the automotive sheet metal, improving bending quality; and can also hold the automotive sheet metal during bending, making the bending more stable, improving bending accuracy, and enhancing the bending effect.

[0005] The technical solution is: a bending device for producing automotive sheet metal parts, including an outer frame with an inlet, an outlet and two filling ports, a storage groove at the bottom of the outer frame, a sliding groove at the upper part of the outer frame, an automotive sheet metal part placed in the middle of the outer frame, four support legs installed at the bottom of the outer frame, a bending mechanism on the outer frame, and a positioning mechanism between the outer frame and the sliding frame.

[0006] Furthermore, the bending mechanism includes a hydraulic rod installed inside the outer frame. The telescopic end of the hydraulic rod is fixedly connected to a sliding frame that is slidably connected to the slide groove. The sliding frame is provided with a bending head, and the outer frame is provided with a bending seat.

[0007] Furthermore, the bending head includes a bending block fixed to the sliding frame. Two vertical grooves are opened on both sides of the bending block. A stop block is slidably connected between the two vertical grooves on the same side of the bending block. Two contact frames that are slidably connected to the bending block are fixed between the two stop blocks. One end of the two contact frames protrudes from the bending block. A tension spring is connected between the two contact frames and the bottom of the bending block.

[0008] Furthermore, the bending seat includes a limiting frame installed in the middle of the outer frame and having four horizontal slots at the bottom. Two electric push rods are installed at the bottom of the limiting frame. A movable plate is fixedly connected to the telescopic end of each of the two electric push rods. The two movable plates are slidably connected to two horizontal slots located on the same side of the limiting frame. A bending tube is rotatably connected to the upper part of the side of the two movable plates that are close to each other.

[0009] Furthermore, the surface of the bent tube has several small holes that communicate with the interior.

[0010] Furthermore, the positioning mechanism includes two symmetrically rotating shafts connected to the middle of the outer frame. Each shaft has a threaded groove on both sides, and a threaded block is threadedly connected to each threaded groove on both shafts. A positioning frame that contacts the outer frame is provided between the two threaded blocks located on different shafts and on the same side. Both positioning frames have inclined surfaces on both sides. A gear is fixed to one end of each shaft, and two racks with their bottoms meshing with the two gears are fixed to one end of the sliding frame.

[0011] Furthermore, it also includes two sponge sleeves that are respectively fitted onto the outside of the bent tube.

[0012] Furthermore, it also includes a lubrication mechanism located between the outer frame and the bent pipe. The lubrication mechanism includes two oil reservoirs that are symmetrically fixed to the outer frame and whose tops are respectively connected to two filling ports. The bottom of each of the two oil reservoirs is connected to a vertical pipe, and the bottom ends of the two vertical pipes are respectively connected to a sleeve. One end of each of the two bent pipes is rotatably connected to a trigger pipe whose lower part is slidably connected to the sleeve. A trigger hole is opened on the side of each of the two trigger pipes that is far apart from each other.

[0013] Furthermore, it also includes a stabilizing mechanism located between the bending block and the abutment block. The stabilizing mechanism includes four piston suction cylinders fixed inside the bending block and communicating with the outside. Each of the four piston suction cylinders has a rubber ring at its bottom. Two piston rods are fixed to the bottom of each abutment block on the side that is close to each other. The four piston rods are slidably connected to the inner walls of the four piston suction cylinders respectively.

[0014] Compared with the prior art, the present invention has the following advantages: 1. The present invention drives the rack through the hydraulic rod to drive the rotating shaft through the gear, and then uses the threaded block to make the positioning frame press the automotive sheet metal part for positioning, thereby improving the bending accuracy and enhancing the bending effect; the bending head and the bending tube cooperate to press the automotive sheet metal part for a first-stage bending; the contact frame abuts against the edge of the limiting block so that the abutment block abuts against the automotive sheet metal part with its top flush with the top of the bending block, and the electric push rod drives the bending tube to smoothly bend the automotive sheet metal part twice, avoiding the secondary positioning from affecting the bending speed and improving the bending efficiency; the tension spring resets and causes the top of the abutment block to disengage from the automotive sheet metal part, reducing the contact area and friction, making it easier for the operator to remove the bent automotive sheet metal part.

[0015] 2. The sponge sleeve allows for indirect, soft contact between the bending tube and the surface of the automotive sheet metal parts, preventing scratches and improving bending quality. After each bending of the automotive sheet metal parts, a small amount of lubricating oil is added to the sponge sleeve, providing an additional layer of lubricating oil between the bending tube and the automotive sheet metal parts, reducing wear between the sponge sleeve, the bending tube, and the automotive sheet metal parts, further improving bending quality and significantly enhancing the bending effect.

[0016] 3. When the bottom of the bending block contacts the surface of the automotive sheet metal part, the piston suction cylinder will contact the surface of the automotive sheet metal part through the rubber ring. When the block moves upward based on the bending block, it will drive the piston rod to move upward based on the piston suction cylinder, thereby generating negative pressure inside the piston suction cylinder, which fully adsorbs the automotive sheet metal part through the rubber ring, making it less likely for the automotive sheet metal part to deviate during bending, significantly improving the bending accuracy, and thus further enhancing the bending effect. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a cross-sectional three-dimensional structural diagram of the present invention.

[0019] Figure 3 This is a partial cross-sectional three-dimensional structural schematic diagram of the present invention.

[0020] Figure 4 This is a cross-sectional three-dimensional structural diagram of the bending mechanism, automotive sheet metal parts, and outer frame of the present invention.

[0021] Figure 5 This is a partial three-dimensional structural schematic diagram of the present invention.

[0022] Figure 6 This is a partial three-dimensional structural diagram of the bending mechanism of the present invention.

[0023] Figure 7 This is a partial cross-sectional three-dimensional structural diagram of the bending head and stabilizing mechanism of the present invention.

[0024] Figure 8 This is a three-dimensional structural diagram showing the disassembled bending head, hydraulic rod, and sliding frame of the present invention.

[0025] Figure 9 This is a three-dimensional structural diagram of the bending seat and sponge sleeve of the present invention.

[0026] Figure 10 This is a cross-sectional three-dimensional structural diagram of the bending seat and sponge sleeve of the present invention.

[0027] Figure 11 This is a three-dimensional structural diagram of the disassembled bending seat and sponge sleeve of the present invention.

[0028] Figure 12 This is a three-dimensional structural diagram of the positioning mechanism, automotive sheet metal parts, and sliding frame of the present invention.

[0029] Figure 13 This is a three-dimensional structural diagram of the positioning mechanism of the present invention and the automotive sheet metal parts.

[0030] Figure 14 This is a schematic diagram of the disassembled three-dimensional structure of the positioning mechanism of the present invention.

[0031] Figure 15 For the present invention Figure 3 A magnified three-dimensional structural diagram at point A in the middle.

[0032] Figure 16 This is a cross-sectional three-dimensional structural diagram of the lubrication mechanism and the bending tube of the present invention.

[0033] Figure 17 This is a partial cross-sectional perspective view of the lubrication mechanism and the bending tube of the present invention.

[0034] Figure 18 This is a three-dimensional structural diagram of the stabilizing mechanism and the stop block of the present invention.

[0035] Figure 19 This is a partial cross-sectional three-dimensional structural diagram of the stabilizing mechanism and the abutment block of the present invention.

[0036] In the attached diagrams: 0: Automotive sheet metal part, 1: Outer frame, 101: Inlet, 102: Outlet, 103: Filling port, 104: Slide groove, 2: Support leg, 31: Hydraulic rod, 32: Sliding frame, 41: Bending block, 411: Vertical groove, 42: Abutment block, 43: Contact frame, 44: Tension spring, 51: Limit frame, 511: Horizontal groove, 52: Electric push rod, 53: Moving plate, 54: Bending tube, 6: Sponge sleeve, 71: Rotating shaft, 72: Threaded block, 73: Positioning frame, 74: Gear, 75: Rack, 81: Oil reservoir, 82: Vertical tube, 83: Sleeve, 84: Trigger tube, 841: Trigger hole, 91: Piston suction cylinder, 92: Rubber ring, 93: Piston rod. Detailed Implementation

[0037] The invention will now be described more fully below with reference to the accompanying drawings, in which presently preferred embodiments of the invention are illustrated. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness and to fully convey the scope of the invention to those skilled in the art.

[0038] Example 1: A bending device for automotive sheet metal parts production, such as... Figures 1-19 As shown, the device includes an outer frame 1 with an inlet 101, an outlet 102, and two filling ports 103. The bottom of the outer frame 1 has a storage groove, and the upper part of the outer frame 1 has a sliding groove 104 connecting the two sides of the interior. An automotive sheet metal part 0 is placed in the middle of the outer frame 1. Four support legs 2 are installed at the bottom of the outer frame 1. The outer frame 1 is equipped with a bending mechanism for bending the automotive sheet metal part 0. A positioning mechanism for positioning the automotive sheet metal part 0 is provided between the outer frame 1 and the sliding frame 32.

[0039] The bending mechanism includes a hydraulic rod 31 installed inside the outer frame 1. The telescopic end of the hydraulic rod 31 is connected by bolts to a sliding frame 32 that is slidably connected to the slide groove 104. The sliding frame 32 is provided with bending heads for primary bending and cooperating with secondary bending to abut against the middle of both sides of the automotive sheet metal part 0. The outer frame 1 is provided with bending seats for secondary bending and cooperating with primary bending to abut against the bottom of both sides of the automotive sheet metal part 0.

[0040] The bending head includes a bending block 41 bolted to the sliding frame 32 and used to create a first-stage bend by pressing the middle of the automotive sheet metal part 0. Two vertical grooves 411 are opened on both sides of the bending block 41. A stop block 42 is slidably connected between the two vertical grooves 411 on the same side of the bending block 41 for abutting the middle of both sides of the automotive sheet metal part 0 during a second-stage bend. Two contact frames 43 are welded between the two stop blocks 42 and are symmetrically distributed and slidably connected to the bending block 41. One end of the two contact frames 43 protrudes from the bending block 41. A tension spring 44 is connected between the two contact frames 43 and the bottom of the inner side of the bending block 41.

[0041] The bending seat includes a limiting frame 51 installed in the middle of the outer frame 1 and having four horizontal slots 511 at the bottom. Two electric push rods 52 are installed at the bottom of the limiting frame 51. The telescopic ends of the two electric push rods 52 are each connected by bolts to a movable plate 53 for flattening both sides of the automotive sheet metal part 0 after the first-stage bend. The two movable plates 53 are symmetrically slidably connected to the two horizontal slots 511 located on the same side of the limiting frame 51. The upper part of the side of the two movable plates 53 that are close to each other is rotatably connected to a bending tube 54 for extruding the upper parts of both sides of the automotive sheet metal part 0 after the first-stage bend to generate a second-stage bend.

[0042] The surface of the bent tube 54 has several small holes that communicate with the interior.

[0043] The positioning mechanism includes two symmetrically rotating shafts 71 connected to the middle of the outer frame 1. Each of the two shafts 71 has a threaded groove on both sides. The two threaded grooves on the same shaft 71 are symmetrically distributed. Each of the two threaded grooves on the two shafts 71 is threadedly connected to a threaded block 72. A positioning frame 73 is provided between the two threaded blocks 72 located on different shafts 71 and on the same side, which contacts the outer frame 1. The two positioning frames 73 are symmetrically distributed. Both sides of the two positioning frames 73 have symmetrically distributed inclined surfaces for pressing the four corners of the automotive sheet metal part 0 to a designated position. One end of each shaft 71 is connected to a gear 74 by a flat key. One end of the sliding frame 32 is connected by two symmetrically distributed racks 75, whose bottoms respectively mesh with the two gears 74.

[0044] It also includes two sponge sleeves 6, which are respectively fitted on the outside of the bent tube 54 to prevent scratching the surface of the automotive sheet metal parts 0.

[0045] First, the operator places the automotive sheet metal part 0 in the middle of the outer frame 1 through the feed port 101, positioning it between the two positioning brackets 73. When bending is required, the operator controls the extension rod of the hydraulic rod 31 to retract, causing the sliding bracket 32, bending head, and two racks 75 to move downwards along the slide groove 104. The two racks 75 drive the two rotating shafts 71 to rotate in opposite directions via two gears 74. The threaded grooves of the two rotating shafts 71 cause the four threaded blocks 72 to move the two positioning brackets 73 closer together. The inclined surfaces of the two positioning brackets 73 press the four corners of the automotive sheet metal part 0 to move to the designated position. Then, the racks 75 disengage from the gears 74, thereby positioning the automotive sheet metal part 0. This makes subsequent bending of the automotive sheet metal part 0 more precise, improves bending accuracy, and enhances bending effect. Simultaneously with positioning, the bottom of the bending head contacts the surface of the automotive sheet metal part 0. The bending head continues to move downwards, pressing the middle of the automotive sheet metal part 0. The two bending tubes 54, through two sponge sleeves 6, respectively abut against the two sides of the automotive sheet metal part 0 and rotate accordingly, causing the two sides of the automotive sheet metal part 0 to bend upwards for the first-stage bending. The sponge sleeves 6 provide indirect, soft contact between the bending tubes 54 and the surface of the automotive sheet metal part 0, thus preventing the bending tubes 54 from scratching the automotive sheet metal part 0 during bending and improving bending quality. Simultaneously with the first-stage bending, one end of the contact frame 43 protruding from the bending block 41 abuts against the edge of the limiting block, pulling the stop block 42 and preventing it from moving. The tension spring 44 is stretched, thus... The two abutments 42 are positioned so that their tops are flush with the tops of the bending block 41, pressing against the upper inner sides of the automotive sheet metal part 0 after the first-stage bend. After the first-stage bend, the operator controls the retraction of the telescopic rods of the two electric push rods 52, which in turn move the two moving plates 53 toward each other. This causes the two bending tubes 54 to press the upper sides of the automotive sheet metal part 0 after the first-stage bend through the two sponge sleeves 6 toward each other, causing the upper sides of the automotive sheet metal part 0 after the first-stage bend to buckle inward, forming a second-stage bend. The automotive sheet metal part 0 after the second-stage bend will cover the surfaces of the bending block 41 and the abutments 42. In this way, the automotive sheet metal part 0 can be smoothly bent twice, avoiding the impact of secondary positioning on the bending speed and improving bending efficiency. After the bending is completed, the operator... The operator controls the extension rods of the two electric push rods 52 to extend and reset, causing the two bending tubes 54 and the two sponge sleeves 6 to disengage from the bent automotive sheet metal part 0. Then, the operator continues to control the extension rods of the hydraulic rod 31 to extend and reset, causing the bending head to reset and move the bent automotive sheet metal part 0 upward to the horizontal position of the discharge port 102. The operator can then pull out the bent automotive sheet metal part 0 through the discharge port 102. When the bending head resets upward, the tension spring 44 resets, causing the two abutments 42 and the two contact frames 43 to reset downward based on the bending block 41, so that the top of the abutment 42 disengages from the bent automotive sheet metal part 0, reducing the contact area and friction of the bent automotive sheet metal part 0, making it easier for the operator to remove the bent automotive sheet metal part 0.

[0046] Example 2: Based on Example 1, such as Figure 3 , Figure 5 and Figures 15-17 As shown, it also includes a lubrication mechanism located between the outer frame 1 and the bent tube 54 to reduce wear. The lubrication mechanism includes two symmetrical oil tanks 81 connected to the outer frame 1 by bolts and whose tops are respectively connected to two filling ports 103. The oil tanks 81 are used to store lubricating oil. The bottom of each of the two oil tanks 81 is connected to a vertical pipe 82. The bottom ends of the two vertical pipes 82 are respectively connected to symmetrically distributed sleeves 83. One end of each of the two bent tubes 54 is rotatably connected to a symmetrically distributed trigger tube 84 whose lower part is slidably connected to the sleeve 83. Each of the two trigger tubes 84 has a trigger hole 841 on the side that is far away from each other, which can communicate with the sleeve 83. Initially, the trigger tube 84 blocks the sleeve 83.

[0047] Initially, both oil reservoirs 81 are filled with lubricating oil. Under the influence of gravity, the lubricating oil enters the sleeve 83 through the vertical pipe 82 and is blocked by the outside of the trigger pipe 84. When the bending pipe 54 moves, the two bending pipes 54 drive the two trigger pipes 84 to move closer to each other. The trigger hole 841 will then connect with the sleeve 83. The blocked lubricating oil will sequentially enter the sponge sleeve 6 through the trigger hole 841, the trigger pipe 84, the bending pipe 54, and several small holes. The bending pipe 54 resets, causing the trigger pipe 84 to reset and block the lubricating oil again. This process is repeated. After each bending of the automotive sheet metal part 0, a small amount of lubricating oil is added to the sponge sleeve 6, providing an extra layer of lubricating oil between the bending pipe 54 and the automotive sheet metal part 0, in addition to the sponge sleeve 6. This reduces wear between the sponge sleeve 6, the bending pipe 54, and the automotive sheet metal part 0, further improving the bending quality and significantly enhancing the bending effect. The operator can add lubricating oil to the oil reservoir 81 through the filling port 103 as needed.

[0048] Example 3: Based on Example 2, such as Figure 3 , Figure 7 , Figure 18 and Figure 19 As shown, it also includes a stabilizing mechanism located between the bending block 41 and the abutment block 42 to prevent the automotive sheet metal part 0 from shifting during bending. The stabilizing mechanism includes four piston suction cylinders 91 that are bolted to the inside of the bending block 41 and communicate with the outside. Each of the four piston suction cylinders 91 has a rubber ring 92 at its bottom. The piston suction cylinders 91 and the rubber rings 92 are used to suction the surface of the automotive sheet metal part 0. The bottom of each of the two abutment blocks 42, which are close to each other, is bolted to two piston rods 93. The four piston rods 93 are slidably connected to the inner walls of the four piston suction cylinders 91.

[0049] When the bottom of the bending block 41 contacts the surface of the automotive sheet metal part 0, the piston suction cylinder 91 contacts the surface of the automotive sheet metal part 0 through the rubber ring 92. When the abutment block 42 moves upward based on the bending block 41, it will drive the piston rod 93 to move upward based on the piston suction cylinder 91, thereby generating a negative pressure inside the piston suction cylinder 91, which fully adsorbs the automotive sheet metal part 0 through the rubber ring 92, making it less likely for the automotive sheet metal part 0 to deviate during bending, significantly improving the bending accuracy, and thus further enhancing the bending effect. When the abutment block 42 resets, it drives the piston rod 93 to reset, so that the piston suction cylinder 91 no longer adsorbs the surface of the automotive sheet metal part 0 through the rubber ring 92, avoiding affecting the material output.

[0050] It should be understood that the above description is for illustrative purposes only and is not intended to limit the invention. Those skilled in the art will understand that variations of the invention are included within the scope of the claims herein.

Claims

1. A bending device for producing automotive sheet metal parts, characterized in that: The utility model provides a kind of automobile sheet metal part bending device, including the outer frame (1) with a feed port (101), a discharge port (102) and two filling ports (103), the outer frame (1) bottom is opened with a storage groove, the outer frame (1) middle upper portion is opened with a sliding slot (104), the outer frame (1) middle portion is placed with a car sheet metal part (0), the outer frame (1) bottom is equipped with four supporting legs (2), the outer frame (1) is equipped with bending mechanism, and the outer frame (1) is equipped with positioning mechanism between sliding frame (32). The bending mechanism includes a hydraulic rod (31) mounted in the outer frame (1), the telescopic end of the hydraulic rod (31) is fixedly connected with a sliding frame (32) slidingly connected with the sliding slot (104), the sliding frame (32) is provided with a bending head, and the outer frame (1) is provided with a bending seat. The bending head includes a bending block (41) fixedly connected to the sliding frame (32), two vertical grooves (411) are formed on both sides of the bending block (41), a stop block (42) is slidingly connected between the two vertical grooves (411) on the same side of the bending block (41), two contact frames (43) slidingly connected with the bending block (41) are fixedly connected between the two stop blocks (42), and one end of the two contact frames (43) protrudes from the bending block (41), and a tension spring (44) is connected between the other end of the two contact frames (43) and the inner bottom of the bending block (41). The bending seat includes a limiting frame (51) mounted in the outer frame (1) and having four horizontal grooves (511) formed in the bottom, two electric push rods (52) are mounted on the bottom of the limiting frame (51), a moving plate (53) is fixedly connected to the telescopic end of each electric push rod (52), the two moving plates (53) are slidingly connected with the two horizontal grooves (511) on the same side of the limiting frame (51), and a bending pipe (54) is rotatably connected to the upper part of the side of each moving plate (53) close to the other; a plurality of small holes are formed in the surface of the bending pipe (54) and communicate with the inside. The utility model also includes a lubricating mechanism arranged between the outer frame (1) and the bending pipe (54), the lubricating mechanism includes two oil tanks (81) symmetrically fixed to the outer frame (1) and having top portions respectively communicating with the two filling ports (103), the bottom portions of the two oil tanks (81) respectively communicate with a vertical pipe (82), the bottom ends of the two vertical pipes (82) respectively communicate with a sleeve pipe (83), one end of each bending pipe (54) rotatably communicates with a trigger pipe (84) slidingly connected with the sleeve pipe (83) at the lower part, and the other side of each trigger pipe (84) away from each other is provided with a trigger hole (841).

2. The bending device for producing an automobile sheet metal part according to claim 1, characterized in that: The positioning mechanism comprises two rotating shafts (71) symmetrically connected to the middle part of the outer frame (1), a threaded groove is arranged on the two sides of the two rotating shafts (71), a threaded block (72) is threadedly connected to the threaded groove on the two sides of the two rotating shafts (71), a positioning frame (73) in contact with the outer frame (1) is arranged between the two threaded blocks (72) on the same side of different rotating shafts (71), the two sides of the two positioning frames (73) are provided with inclined surfaces, a gear (74) is fixedly connected to one end of each of the two rotating shafts (71), and a rack (75) engaged with the two gears (74) is fixedly connected to one end of the sliding frame (32).

3. The bending device for producing an automobile sheet metal part according to claim 2, characterized in that: The positioning mechanism further comprises two sponge sleeves (6) respectively sleeved on the outer sides of the bent pipes (54).

4. The bending device for producing an automobile sheet metal part according to claim 1, characterized in that: The positioning mechanism further comprises a stabilizing mechanism arranged between the bending block (41) and the abutting block (42), the stabilizing mechanism comprises four piston suction cylinders (91) fixedly connected to the inside of the bending block (41) and in communication with the outside, a rubber ring (92) is arranged at the bottom of each of the four piston suction cylinders (91), two piston rods (93) are fixedly connected to the bottom of one side of each of the two abutting blocks (42), and the four piston rods (93) are respectively and slidably connected to the inner walls of the four piston suction cylinders (91).

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