A bending device for automobile sheet metal processing

Abstract

The present invention relates to the technical field of non-cutting processing of metal sheets, and particularly to a bending device for processing automotive sheets. The technical problem is that when the current bending device bends the sheet, it is not convenient to position the sheet from multiple directions, resulting in inaccurate bending of the sheet. Moreover, due to the large friction generated between the sheet and the die during bending, and the current bending device is difficult to lubricate the part of the sheet that is subject to friction when bending the sheet, resulting in easy wear of the sheet during bending, and thus the bending effect is not good. A bending device for processing automotive sheets includes: a static die; a frame fixedly connected to the static die; a hydraulic rod fixedly connected to the top of the frame; and a lifting frame slidably connected to the frame. Before bending the sheet, lubricating oil is sprayed on the sheet to lubricate the part of the sheet that is subject to friction, so that the sheet is not easily worn during bending, thereby enhancing the bending effect.

Description

Technical Field

[0001] The present invention relates to the technical field of non-cutting processing of metal sheets, and particularly to a bending device for processing automotive sheets. Background Art

[0002] In the field of automotive manufacturing, some components are produced through the sheet bending process. By bending the metal sheet into a specific shape according to the design requirements through the bending process, not only can the forming of complex geometric structures be achieved, but also the strength and light weight of the components can be ensured. When bending the sheet, the sheet will be placed on the bending device, and then the moving die and the stationary die will jointly extrude the sheet to complete the bending of the sheet.

[0003] Since the sheet is prone to deviation during bending, and the current bending device is not convenient for continuously positioning the sheet from multiple directions when bending the sheet, resulting in inaccurate bending of the sheet. Moreover, due to the large friction generated between the sheet and the die during bending, and the current bending device is difficult to lubricate the parts of the sheet that are subject to friction when bending the sheet, resulting in easy wear of the sheet during bending, and thus the bending effect is not good. Summary of the Invention

[0004] In order to overcome the above disadvantages, the present invention provides a bending device for processing automotive sheets, which can position the sheet from multiple directions to make the bending of the sheet more accurate and lubricate the parts of the sheet that are subject to friction so that the sheet is not easily worn during bending, thereby enhancing the bending effect.

[0005] The technical implementation solution of the present invention is: a bending device for processing automotive sheets, including:

[0006] A stationary die;

[0007] A frame, fixedly connected to the stationary die;

[0008] A hydraulic rod, fixedly connected to the top of the frame;

[0009] A lifting frame, slidably connected to the frame, and the lifting frame is fixedly connected to the telescopic rod of the hydraulic rod;

[0010] A moving die, fixedly connected to the middle of the lifting frame;

[0011] A sheet, placed on the stationary die;

[0012] A positioning mechanism, arranged on the stationary die;

[0013] A deviation correction mechanism, arranged on the positioning mechanism;

[0014] A pushing mechanism, arranged on the frame.

[0015] More preferably, the positioning mechanism includes: two positioning plates respectively slidably connected to both sides of the stationary mold, with grooves formed on one side of each of the two positioning plates facing each other; connecting arms are fixedly connected to both positioning plates, and guiding grooves are formed on both of the two connecting arms; two connecting columns are fixedly connected to the lifting frame, and the two connecting columns are respectively slidably connected to the guiding grooves of the two connecting arms.

[0016] More preferably, the deviation rectifying mechanism includes: four crankshafts, with two of these crankshafts rotatably connected to each positioning plate. The two crankshafts on the same positioning plate form a group. Strip-shaped grooves are formed on all four crankshafts; rotating clamps are fixedly connected to all four crankshafts, and the two rotating clamps on the same group of crankshafts form a group; contact pieces are fixedly connected to all four rotating clamps, and the two contact pieces on the same group of rotating clamps form a group; two connecting frames are respectively fixedly connected to both sides of the stationary mold, and the two connecting frames on the same side form a group. The four connecting frames are respectively slidably connected to the strip-shaped grooves of the four crankshafts.

[0017] More preferably, the contact piece is made of rubber.

[0018] More preferably, the pushing mechanism includes: a first piston cylinder fixedly connected to the frame; a pressing frame fixedly connected to the lifting frame; a first piston rod slidably connected in the first piston cylinder, the bottom of the first piston rod contacts the pressing frame, and a through hole is formed in the middle of the first piston rod; a pressure spring is connected between the first piston rod and the first piston cylinder; a connecting pipe is connected to the bottom of the first piston rod, and the connecting pipe communicates with the through hole of the first piston rod; two second piston cylinders are fixedly connected to the stationary mold, and both second piston cylinders communicate with the connecting pipe; second piston rods are slidably connected in both second piston cylinders.

[0019] More preferably, a lubricating mechanism is further included for lubricating the plate. The lubricating mechanism is arranged on the stationary mold. The lubricating mechanism includes: an oil storage tank fixedly connected to the stationary mold; the oil storage tank is connected with a first shunt pipe, and the first shunt pipe communicates with the inside of the oil storage tank; both ends of the first shunt pipe are respectively connected with a first one-way valve; third piston cylinders are connected to both first one-way valves; two dispersion pipes are fixedly connected in the stationary mold; sponges are installed on both dispersion pipes, and both sponges contact the plate; second one-way valves are connected between the two dispersion pipes and the two third piston cylinders respectively; third piston rods are slidably connected in both third piston cylinders; tension springs are connected between the two third piston rods and the two third piston cylinders respectively.

[0020] More preferably, a filling port is formed on the oil storage tank.

[0021] More preferably, it further includes a top component for spraying lubricating oil from the top. The top component is arranged on the connecting arm, and the top component includes: two shunt frames respectively fixed on the two connecting arms; a number of nozzles are evenly spaced and installed on the two shunt frames respectively; fourth one-way valves are connected to both of the two shunt frames; fourth piston cylinders are connected to both of the two fourth one-way valves; second shunt pipes are respectively connected to both sides of the first shunt pipe; third one-way valves are connected between the two second shunt pipes and the two fourth piston cylinders respectively; fourth piston rods are slidably connected in both of the two fourth piston cylinders, and the two fourth piston rods are respectively fixed to both sides of the frame.

[0022] More preferably, it further includes a scraper fixed between the two second piston rods, and the scraper contacts the static mold.

[0023] Compared with the prior art, the present invention has the following advantages: 1. Before bending the plate, the positioning plate abuts against the plate from both ends and corrects the deviation of the plate from both sides, so as to position the plate from multiple directions, making the bending of the plate more accurate and thus enhancing the bending effect.

[0024] 2. After the plate is bent, the two second piston rods push the plate out of the static mold, and then automatically unload the bent plate, shortening the production cycle and thus improving the efficiency; when the scraper resets, it will scrape off the debris attached to the static mold, thus avoiding the debris from pressing and damaging the plate and affecting the quality of the plate.

[0025] 3. Before bending the plate, lubricating oil is sprayed on the plate to lubricate the parts of the plate that are subjected to friction, so that the plate is not easily worn during bending, and thus further enhances the bending effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0027] Figure 2 It is a sectional three-dimensional structural schematic diagram of the present invention.

[0028] Figure 3 It is a three-dimensional structural schematic diagram of the positioning mechanism of the present invention.

[0029] Figure 4 It is a three-dimensional structural schematic diagram of the deviation correction mechanism and the positioning mechanism of the present invention.

[0030] Figure 5 It is a three-dimensional structural schematic diagram of the deviation correction mechanism of the present invention.

[0031] Figure 6 It is a sectional three-dimensional structural schematic diagram of the pushing-out mechanism of the present invention.

[0032] Figure 7This is a partially sectional three-dimensional structural schematic diagram of the ejection mechanism of the present invention.

[0033] Figure 8 This is a partially disassembled three-dimensional structural schematic diagram of the ejection mechanism of the present invention.

[0034] Figure 9 This is a three-dimensional structural schematic diagram of the lubrication mechanism and the top assembly of the present invention.

[0035] Figure 10 This is a partially sectional three-dimensional structural schematic diagram of the lubrication mechanism of the present invention.

[0036] Figure 11 This is a partially disassembled three-dimensional structural schematic diagram of the lubrication mechanism of the present invention.

[0037] Figure 12 This is a sectional three-dimensional structural schematic diagram of the top assembly of the present invention.

[0038] Figure 13 This is a disassembled three-dimensional structural schematic diagram of the top assembly of the present invention.

[0039] Among them, the above-mentioned drawings include the following reference numerals: 1, stationary mold; 2, frame; 3, hydraulic rod; 4, lifting frame; 5, moving mold; 6, sheet material; 7, positioning mechanism, 71, positioning plate, 72, connecting arm, 73, connecting column; 8, deviation rectifying mechanism, 81, crankshaft, 82, rotating clamp, 83, contact piece, 84, connecting frame; 9, ejection mechanism, 91, first piston cylinder, 92, extrusion frame, 93, first piston rod, 94, pressure spring, 95, connecting pipe, 96, second piston cylinder, 97, second piston rod; 10, lubrication mechanism, 101, oil storage tank, 102, first shunt pipe, 1031, first one-way valve, 1032, second one-way valve, 104, third piston cylinder, 105, dispersion pipe, 106, sponge, 107, third piston rod, 108, tension spring; 11, top assembly, 111, shunt frame, 112, nozzle, 113, second shunt pipe, 1141, third one-way valve, 1142, fourth one-way valve, 115, fourth piston cylinder, 116, fourth piston rod; 12, scraper. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. 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.

[0041] Embodiment 1: A bending device for processing automotive sheet materials, as Figures 1 - 8 shown, includes:

[0042] Static mold 1;

[0043] The frame 2 is connected to the static mold 1 by bolts;

[0044] The hydraulic rod 3 is connected to the top of the frame 2 by bolts;

[0045] A lifting frame 4 is slidably connected to the frame 2, and the lifting frame 4 is connected to the telescopic rod of the hydraulic rod 3 by bolts;

[0046] The movable mold 5 is connected to the middle part of the lifting frame 4 by bolts;

[0047] The plate 6 is placed on the static mold 1;

[0048] A positioning mechanism 7 is provided on the static mold 1;

[0049] A deviation correction mechanism 8 is provided on the positioning mechanism 7;

[0050] The ejection mechanism 9 is arranged on the frame 2 .

[0051] The positioning mechanism 7 includes: two positioning plates 71 respectively connected to the two sides of the static mold 1 in a sliding manner, and the two positioning plates 71 have grooves on their sides close to each other, and the two positioning plates 71 are used to position the plate 6; the two positioning plates 71 are connected to connecting arms 72 by bolts, and the two connecting arms 72 are provided with guide grooves; the lifting frame 4 is connected to two connecting columns 73 by bolts, and the two connecting columns 73 are respectively connected to the guide grooves of the two connecting arms 72 in a sliding manner, and the connecting columns 73 are used to drive the positioning plates 71 to move by squeezing the guide grooves of the connecting arms 72.

[0052] The correcting mechanism 8 includes: four crankshafts 81, two of which are rotatably connected to each positioning plate 71, the two crankshafts 81 on the same positioning plate 71 form a group, and the four crankshafts 81 are all provided with strip grooves; the four crankshafts 81 are all connected with rotating clamps 82 through key grooves, and the two rotating clamps 82 on the same group of crankshafts 81 form a group; the four rotating clamps 82 are all connected with contact pieces 83 through bolts, and the two contact pieces 83 on the same group of rotating clamps 82 form a group, and the rotating clamps 82 are used to press against the plate 6 through the contact pieces 83; two connecting frames 84 are respectively connected to the two sides of the static mold 1 through bolts, and the two connecting frames 84 on the same side form a group, and the four connecting frames 84 are respectively slidably connected to the strip grooves of the four crankshafts 81, and the connecting frames 84 are used to drive the rotating clamps 82 to be rotatably connected by extruding the strip grooves of the crankshafts 81.

[0053] The contact piece 83 is made of rubber material, and the rubber contact piece 83 is used to reduce the wear on the plate 6 .

[0054] The ejecting mechanism 9 includes: a first piston cylinder 91 bolted to the frame 2; an extrusion frame 92 bolted to the lifting frame 4; a first piston rod 93 slidably connected in the first piston cylinder 91, the bottom of the first piston rod 93 being in contact with the extrusion frame 92, a through hole being formed in the middle of the first piston rod 93, the extrusion frame 92 being used to extrude the first piston rod 93 to move; a pressure spring 94 connected between the first piston rod 93 and the first piston cylinder 91; a connecting pipe 95 connected to the bottom of the first piston rod 93, the connecting pipe 95 being communicated with the through hole of the first piston rod 93; two second piston cylinders 96 bolted to the stationary mold 1, both of the two second piston cylinders 96 being communicated with the connecting pipe 95; second piston rods 97 slidably connected in the two second piston cylinders 96 respectively, the second piston rods 97 being used to eject the sheet material.

[0055] Further included is a scraper 12 bolted between the two second piston rods 97, the scraper 12 being in contact with the stationary mold 1, the scraper 12 being used to scrape off the debris adhering to the stationary mold 1.

[0056] At first, the second piston cylinder 96 is filled with hydraulic oil. The extrusion frame 92 abuts against the first piston rod 93, making the compression spring 94 in a compressed state. First, the operator places the sheet 6 on the stationary mold 1. Subsequently, the operator controls the telescopic rod of the hydraulic rod 3 to extend, so that the telescopic rod of the hydraulic rod 3 drives the lifting frame 4 to move downward. The downward movement of the lifting frame 4 will drive the extrusion frame 92, the two connecting columns 73 and the moving mold 5 to move downward together. After the extrusion frame 92 moves downward a certain distance, it no longer abuts against the first piston rod 93. The compression spring 94 resets and drives the first piston rod 93 to move downward. The downward movement of the first piston rod 93 causes a negative pressure to be generated in the first piston cylinder 91. Subsequently, the negative pressure in the first piston cylinder 91 sucks the hydraulic oil in the two second piston cylinders 96 into the first piston cylinder 91 through the through hole of the first piston rod 93 and the connecting pipe 95, so that the two second piston rods 97 drive the scraping plates 12 to move in the direction close to the second piston cylinders 96. After the two second piston rods 97 drive the scraping plates 12 to move a certain distance, the scraping plates 12 no longer contact the stationary mold 1. When the two connecting columns 73 move downward, they will respectively squeeze the guide grooves of the two connecting arms 72, so that the two connecting arms 72 drive the two positioning plates 71 to move a certain distance in the direction close to each other, so that the two positioning plates 71 abut against the sheet 6 from both ends respectively. When the two positioning plates 71 approach each other, they will drive the two groups of crankshafts 81 to approach each other. At the same time, the four connecting frames 84 will respectively abut against the strip-shaped grooves of the four crankshafts 81, so that the four crankshafts 81 drive the four rotating clamps 82 to rotate 90 degrees in the direction close to the sheet 6, so that the four rotating clamps 82 respectively abut against the sheet 6 from both sides of the sheet 6 through the contact pieces 83 made of rubber material. Furthermore, the rotating clamps 82 avoid abrasion of the sheet 6 through the contact pieces 83 made of rubber material. In this way, before bending the sheet 6, the positioning plates 71 abut against the sheet 6 from both ends and correct the deviation of the sheet 6 from both sides, and then position the sheet 6 from multiple directions, making the bending of the sheet 6 more accurate, thereby enhancing the bending effect; Subsequently, the moving mold 5 continues to move downward and jointly squeezes the sheet 6 with the stationary mold 1, thus completing the bending of the sheet 6;Subsequently, control the retraction of the telescopic rod of the hydraulic rod 3 to drive the lifting frame 4 to move upward and reset. The reset of the lifting frame 4 will drive the two connecting columns 73, the moving mold 5 and the extrusion frame 92 to reset. The reset of the two connecting columns 73 will respectively drive the two positioning plates 71 to reset through the connecting arms 72. The reset of the two positioning plates 71 will respectively drive the two groups of crankshafts 81 to reset through the connecting frames 84. The reset of the two groups of crankshafts 81 causes the two groups of rotary clamps 82 to drive the two groups of contact pieces 83 to reset respectively. When the extrusion frame 92 resets, it will re-extrude the first piston rod 93 to reset, and the pressure spring 94 returns to its initial state. The reset of the first piston rod 93 will extrude the hydraulic oil in the first piston cylinder 91, so that the hydraulic oil in the first piston cylinder 91 enters the two second piston cylinders 96 through the passage of the first piston rod 93 and the connecting pipe 95, causing the two second piston rods 97 to drive the scraper 12 to reset. The reset of the two second piston rods 97 will jointly push the bent plate 6. In this way, after the plate 6 is bent, the plate 6 is pushed out of the stationary mold 1 by the two second piston rods 97, and then the bent plate 6 is automatically unloaded, shortening the production cycle and thus improving the efficiency; at the same time as the scraper 12 resets, it will scrape off the debris attached to the stationary mold 1, thereby preventing the debris from pressing and damaging the plate 6 and affecting the quality of the plate 6; then the operator can collect the bent plate 6.;

[0057] Embodiment 2: On the basis of Embodiment 1, as Figures 1 - 13 shown, it further includes a lubricating mechanism 10 for lubricating the plate 6. The lubricating mechanism 10 is arranged on the stationary mold 1. The lubricating mechanism 10 includes: an oil storage tank 101 connected to the stationary mold 1 by bolts, and the oil storage tank 101 is used for storing lubricating oil; the oil storage tank 101 is connected with a first shunt pipe 102, and the first shunt pipe 102 is communicated with the inside of the oil storage tank 101; both ends of the first shunt pipe 102 are respectively connected with a first one-way valve 1031; a third piston cylinder 104 is connected to both first one-way valves 1031; two dispersion pipes 105 are connected to the stationary mold 1 by bolts; two sponges 106 are installed on the two dispersion pipes 105, and both sponges 106 are in contact with the plate 6. The sponge 106 is used for coating lubricating oil on the plate 6; a second one-way valve 1032 is connected between the two dispersion pipes 105 and the two third piston cylinders 104 respectively; a third piston rod 107 is slidably connected in both third piston cylinders 104, and the groove of the positioning plate 71 is used to squeeze the third piston rod 107 to move; a tension spring 108 is connected between the two third piston rods 107 and the two third piston cylinders 104 respectively.

[0058] A filling port is opened on the oil storage tank 101, and the filling port of the oil storage tank 101 is used for filling lubricating oil.

[0059] It further includes a top component 11 for spraying lubricating oil from the top. The top component 11 is provided on the connecting arm 72. The top component 11 includes: two flow dividing frames 111 respectively connected to the two connecting arms 72 by bolts; a plurality of spray nozzles 112 are evenly spaced and installed on the two flow dividing frames 111, and the plurality of spray nozzles 112 are used to spray lubricating oil onto the plate 6; fourth one-way valves 1142 are connected to the two flow dividing frames 111; the two fourth one-way valves 1142 are both connected to fourth piston cylinders 115; both sides of the first flow dividing pipe 102 are respectively connected to second flow dividing pipes 113; third one-way valves 1141 are connected between the two second flow dividing pipes 113 and the two fourth piston cylinders 115 respectively; fourth piston rods 116 are slidably connected in the two fourth piston cylinders 115, and the two fourth piston rods 116 are respectively connected to the two sides of the frame 2 by bolts.

[0060] At first, there is lubricating oil in the oil storage tank 101, the third piston cylinder 104 and the fourth piston cylinder 115. When the two positioning plates 71 approach each other, the grooves of the two positioning plates 71 will respectively squeeze the two third piston rods 107, and the tension springs 108 are stretched, so that the two third piston rods 107 respectively squeeze the lubricating oil in the two third piston cylinders 104, so that the lubricating oil in the two third piston cylinders 104 respectively enters the two dispersion pipes 105 through the two second one-way valves 1032, so that the lubricating oil soaks into the sponge 106. The sponge 106 soaked with lubricating oil contacts the plate 6, so that the lubricating oil is coated on the bottom surface of the plate 6. At the same time that the two connecting arms 72 approach each other, they will respectively drive the two fourth piston cylinders 115 to approach each other, so that the two fourth piston rods 116 respectively squeeze the lubricating oil in the two fourth piston cylinders 115, so that the lubricating oil in the two fourth piston cylinders 115 respectively enters the two flow dividing frames 111 through the two fourth one-way valves 1142. Subsequently, the lubricating oil in the two flow dividing frames 111 will be respectively sprayed onto the surface of the plate 6 through the nozzles 112. In this way, before bending the plate 6, lubricating oil is sprayed on the plate 6, and then the parts of the plate 6 that are subjected to friction are lubricated, so that the plate 6 is not easily worn during bending, thereby further enhancing the bending effect; after the plate 6 is bent, the positioning plate 71 and the connecting arm 72 are reset. After the positioning plate 71 is reset, it no longer squeezes the third piston rod 107, and the tension spring 108 is reset, so that the third piston rod 107 is reset. The reset of the third piston rod 107 causes a negative pressure in the third piston cylinder 104, so that the negative pressure in the third piston cylinder 104 sucks the lubricating oil from the oil storage tank 101 through the first one-way valve 1031 and the first flow dividing pipe 102. At the same time, the reset of the connecting arm 72 drives the fourth piston cylinder 115 to reset, so that a negative pressure is generated in the fourth piston cylinder 115 through the fourth piston rod 116, so that the negative pressure in the fourth piston cylinder 115 sucks the lubricating oil from the oil storage tank 101 through the third one-way valve 1141, the second flow dividing pipe 113 and the first flow dividing pipe 102. Thus, the lubricating oil in the third piston cylinder 104 and the fourth piston cylinder 115 is replenished. Subsequently, the operator can fill the lubricating oil through the filling port of the oil storage tank 101.

[0061] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. 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 bending device for automobile sheet processing, characterized in that it comprises: Static model (1); A frame (2) is fixedly connected to the static mold (1); A hydraulic rod (3) is fixedly connected to the top of the frame (2); A lifting frame (4) is slidably connected to the frame (2), and the lifting frame (4) is fixedly connected to the telescopic rod of the hydraulic rod (3); The movable mold (5) is fixedly connected to the middle part of the lifting frame (4); The plate (6) is placed on the static mold (1); A positioning mechanism (7) is provided on the static mold (1); A deviation correction mechanism (8) is arranged on the positioning mechanism (7); A push-out mechanism (9) is disposed on the frame (2); The positioning mechanism (7) comprises: two positioning plates (71) respectively connected to two sides of the static mold (1) in a sliding manner, and grooves are formed on the sides of the two positioning plates (71) close to each other; The deviation correction mechanism (8) comprises: four crankshafts (81), two of which are rotatably connected to each positioning plate (71), the two crankshafts (81) on the same positioning plate (71) form a group, and the four crankshafts (81) are provided with strip grooves; the four crankshafts (81) are fixedly connected with rotating clamps (82), the two rotating clamps (82) on the same group of crankshafts (81) form a group; the four rotating clamps (82) are fixedly connected with contact pieces (83), the two contact pieces (83) on the same group of rotating clamps (82) form a group; two connecting frames (84) are fixedly connected to the two sides of the static mold (1), the two connecting frames (84) on the same side form a group, and the four connecting frames (84) are respectively slidably connected to the strip grooves of the four crankshafts (81).

2. A bending device for automobile sheet processing according to claim 1, characterized in that: The positioning mechanism (7) comprises: two connecting arms (72) fixedly connected to the two positioning plates (71), and guide grooves are formed on the two connecting arms (72); and two connecting columns (73) are fixedly connected to the lifting frame (4), and the two connecting columns (73) are respectively slidably connected to the guide grooves of the two connecting arms (72).

3. A bending device for automobile sheet processing according to claim 2, characterized in that: The contact piece (83) is made of rubber.

4. A bending device for automobile sheet processing according to claim 2, characterized in that: The ejection mechanism (9) comprises: a first piston cylinder (91) fixedly connected to the frame (2); an extrusion frame (92) fixedly connected to the lifting frame (4); a first piston rod (93) slidably connected in the first piston cylinder (91), the bottom of the first piston rod (93) contacts the extrusion frame (92), and a through hole is opened in the middle of the first piston rod (93); a pressure spring (94) is connected between the first piston rod (93) and the first piston cylinder (91); a connecting pipe (95) is connected to the bottom of the first piston rod (93), and the connecting pipe (95) is communicated with the through hole of the first piston rod (93); two second piston cylinders (96) are fixedly connected to the static mold (1), and the two second piston cylinders (96) are both communicated with the connecting pipe (95); and the two second piston cylinders (96) are slidably connected with the second piston rods (97).

5. A bending device for automobile sheet processing according to claim 4, characterized in that: The lubricating mechanism (10) is also included, which is used to lubricate the plate (6). The lubricating mechanism (10) is arranged on the static mold (1), and the lubricating mechanism (10) comprises: an oil storage tank (101) fixedly connected to the static mold (1); the oil storage tank (101) is connected to a first shunt pipe (102), and the first shunt pipe (102) is communicated with the inside of the oil storage tank (101); both ends of the first shunt pipe (102) are respectively connected to first one-way valves (1031); and the two first one-way valves (1031) are both connected to a third piston cylinder (104). Two dispersion tubes (105) are fixedly connected in the static mold (1); sponges (106) are installed on the two dispersion tubes (105), and the two sponges (106) are in contact with the plate (6); a second one-way valve (1032) is connected between the two dispersion tubes (105) and the two third piston cylinders (104); a third piston rod (107) is slidably connected in the two third piston cylinders (104); and tension springs (108) are connected between the two third piston rods (107) and the two third piston cylinders (104).

6. A bending device for automobile sheet processing according to claim 5, characterized in that: The oil storage tank (101) is provided with a filling port.

7. A bending device for automobile sheet processing according to claim 5, characterized in that: The machine also comprises a top assembly (11) for spraying lubricating oil from the top. The top assembly (11) is arranged on the connecting arm (72), and comprises: two flow diverter racks (111) respectively fixed to the two connecting arms (72); a plurality of spray heads (112) are respectively installed on the two flow diverter racks (111) at even intervals; the two flow diverter racks (111) are both connected to a fourth one-way valve (1142); the two fourth one-way valves (1142) are both connected to a fourth piston cylinder (115); the two sides of the first flow diverter pipe (102) are respectively connected to a second flow diverter pipe (113); the two second flow diverter pipes (113) are respectively connected to the two fourth piston cylinders (115) with a third one-way valve (1141); the two fourth piston cylinders (115) are both slidably connected to a fourth piston rod (116), and the two fourth piston rods (116) are respectively fixed to the two sides of the frame (2).

8. A bending device for automobile sheet material processing according to claim 7, characterized in that: It also includes a scraper (12) fixed between the two second piston rods (97), and the scraper (12) is in contact with the static mold (1).

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