A bending test device for metal sheets used for automobile bodies

Abstract

The present invention discloses a bending test device for metal sheets for automobile bodies, and relates to the technical field of bending experiments on metal sheets. It comprises a device base, on which a positioning wheel is fixedly mounted, and a positioning assembly is provided on the upper end face of the device base, through which the metal sheet to be bent is fixed; a connecting rod is fixedly mounted on the side end face of the device base, and a mounting frame is fixedly mounted on the end of the connecting rod away from the device base, and a bending assembly is provided on the mounting frame, and the bending assembly is provided with symmetrically arranged bending wheels; and an auxiliary assembly is provided on the device base. This invention uses the positioning assembly, the bending assembly and the auxiliary assembly in coordination, and utilizes hydraulic pressure and an adjusting device to control the mechanical force and fixing force during the bending process, thereby ensuring the precise bending of the metal sheet, while avoiding the problems of uneven stress and deformation, and effectively improving the experimental effect of the device.

Description

Technical Field

[0001] The invention relates to the technical field of bending tests of metal plates, in particular to a bending test device for metal plates used for automobile bodies. Background Art

[0002] The automobile body refers to the main framework and exterior coverings that make up the exterior and interior structure of a vehicle. It encompasses various parts of the vehicle body, such as the roof, doors, windows, underbody, front and rear fenders, and supports the vehicle's powertrain, passengers, cargo, and other important components. Sheet metal for automobile bodies refers to the metal materials used to manufacture the exterior and interior structures of automobile bodies.

[0003] Currently, when performing bending tests on metal sheets used for automobile bodies, a bending test device is used. Most existing devices utilize the movement of a first rotating member and a second rotating member to bend the metal sheet on a third rotating member. However, during the experiment, the first rotating member and the second rotating member are moved and bent. Since the metal sheet cannot be fixed in position, the metal sheet will undergo a certain displacement change in the direction opposite to the first rotating member and the second rotating member, thereby affecting the accuracy and quality of the final bending. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a bending test device for metal plates used for automobile bodies, which solves the problems mentioned in the above background art.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A bending test device for metal sheets for automobile bodies comprises a device base, a positioning wheel is fixedly mounted on the device base, and a positioning assembly is provided on the upper end surface of the device base, and the metal sheet to be bent is fixed by the positioning assembly;

[0007] A connecting rod is fixedly mounted on the side end surface of the device base, a mounting plate is fixedly mounted on one end of the connecting rod away from the device base, a bending assembly is provided on the mounting plate, and symmetrically arranged bending wheels are provided on the bending assembly;

[0008] An auxiliary component is provided on the base of the device, and the metal sheet is positioned during the bending process by means of the auxiliary component.

[0009] Preferably, the bending assembly includes a hydraulic cylinder fixedly mounted on a mounting frame plate, the output rod of the hydraulic cylinder is fixedly mounted with a pushing frame rod, the end of the pushing frame rod is fixedly mounted with a pushing block, a first bearing is fixedly mounted on the pushing block, a connecting shaft is fixedly mounted on the first bearing, a bending gear is fixedly mounted on one end of the connecting shaft, and a symmetrically arranged tooth plate is fixedly mounted on the lower end surface of the device base.

[0010] Preferably, a limiting block is fixedly installed on the outer side surface of the pushing block, symmetrically arranged pushing grooves are provided on the device base, limiting grooves are provided on the inner side surfaces of the pushing grooves, and a rack groove is provided on the side end surface of the device base.

[0011] Preferably, the bending wheel is fixedly mounted on the other end of the linkage shaft, the bending wheel is positioned above the base of the device, the two bending wheels and the positioning wheel are in the form of a triangle, the frame rod groove is connected to the pushing groove, the pushing block is slidably mounted on the pushing groove, and the limit block is slidably mounted on the limit groove.

[0012] Preferably, a linkage rod is fixedly installed on the upper end surface of the pushing frame rod, a symmetrically arranged connecting plate is fixedly installed on the side end surface of the linkage frame rod, a stabilizing block is fixedly installed on the end of the connecting plate, a stabilizing groove is provided on the outer side surface of the stabilizing block, a stabilizing slider is fixedly installed on the lower end surface of the stabilizing block, and a stabilizing slide groove is provided on the upper end surface of the device base and on the outer side of the pushing groove.

[0013] Preferably, the two stabilizing blocks are located outside the positioning wheel, the stabilizing block is located on one side of the bending wheel, and the stabilizing slider is slidably installed inside the stabilizing slide groove.

[0014] Preferably, the auxiliary component includes an L-shaped push plate fixedly mounted on the pushing frame rod, a symmetrically arranged gear block group is fixedly mounted on the side end face of the L-shaped push plate, a second bearing is fixedly mounted on the base of the device, a mounting shaft is fixedly mounted on the second bearing, an auxiliary gear is fixedly mounted on the bottom end of the mounting shaft, a rotating block is fixedly mounted on the top end of the mounting shaft, an auxiliary plate is fixedly mounted on the rotating block, and an auxiliary surface is provided on the side end face of the auxiliary plate.

[0015] Preferably, a U-shaped fixed plate is fixedly mounted on the lower end surface of the device base, the L-shaped push plate is slidably mounted on the U-shaped fixed plate, and the auxiliary gear is engaged with the tooth block group on the L-shaped push plate.

[0016] Preferably, the positioning assembly includes a translation slot provided on the device base, a translation block is slidably installed inside the translation slot, a clamping block is fixedly installed on the translation block, a third bearing is fixedly installed on the side end face of the clamping block, an adjusting screw is fixedly installed on the third bearing, an adjusting handle is fixedly installed on the end of the adjusting screw away from the third bearing, a mounting block is fixedly installed on the device base, the clamping block is positioned on one side of the positioning wheel and is on the same horizontal line as the positioning wheel, the end of the adjusting screw away from the third bearing extends to one side of the mounting block, and the adjusting screw is threadedly mounted on the mounting block.

[0017] Preferably, the positioning wheel and the bending wheel both include a lower wheel body, a fourth bearing is fixedly mounted on the lower wheel body, a lifting screw is fixedly mounted on the fourth bearing, a hexagonal handle is fixedly mounted on the top of the lifting screw, an upper wheel body is movably mounted on the lifting screw, a cylindrical rod is fixedly mounted on the upper end surface of the lower wheel body, and the upper wheel body and the cylindrical rod are slidably mounted.

[0018] The present invention provides a bending test device for metal sheets used in automobile bodies. Compared with the prior art, it has the following advantages:

[0019] 1. The present invention places the metal sheet to be bent between the positioning wheel and the two bending wheels, then fixes the metal sheet through the positioning assembly, and then drives the push frame rod to move horizontally through the hydraulic cylinder. The push frame rod pushes the push block to slide within the push groove, and the bending wheel on the push block moves horizontally. At the same time, when the push block moves horizontally, the bending gear on the push block cooperates with the tooth plate, and the bending gear drives the bending wheel to rotate through the linkage shaft. Since the direction of rotation of the bending wheel is the same as the bending direction of the metal sheet, the bending effect can be effectively improved, because the rotation of the rotating wheel helps to apply uniform pressure, avoids uneven stress concentration on the metal sheet, and reduces the possibility of deformation or damage;

[0020] 2. The present invention, by rotating the adjustment handle and utilizing the cooperation between the adjustment screw and the mounting block, causes the adjustment screw to rotate horizontally on the mounting block. Furthermore, by utilizing the cooperation between the adjustment screw and the third bearing, and between the translation block and the translation slot, the clamping block on the translation block moves horizontally. By adjusting the position of the clamping block, the metal sheet to be bent can be effectively fixed, ensuring that the metal sheet will not be displaced, thereby preventing the bending accuracy of the metal sheet from being affected.

[0021] 3. In the present invention, when the rack rod is pushed to move horizontally, the linkage rack rod is driven to move synchronously, and the connecting plate on the linkage rack rod is then used to drive the stabilizing block to move horizontally. The stabilizing groove on the stabilizing block fits on the metal sheet after the angle bending. The cooperation between the stabilizing block and the clamping block further improves the fixing ability of the metal sheet and avoids the phenomenon of positional deviation or unevenness of the metal sheet during the bending process.

[0022] 4. In the present invention, when the push frame rod is in continuous movement, it will synchronously drive the L-shaped push plate to move horizontally. At this time, the two ends of the metal plate will rotate at an angle, and the two ends of the metal plate are on the inner side of the two auxiliary plates. The tooth block group on the L-shaped push plate will engage with the auxiliary gear on the mounting shaft. By utilizing the positioning of the second bearing, the mounting shaft will drive the auxiliary plate on the rotating block to rotate synchronously inward when rotating. By utilizing the fitting contact between the auxiliary surface on the auxiliary plate and the metal plate, the metal plate can be effectively prevented from being offset due to lack of support during the bending process, thereby maintaining the precise bending shape of the metal plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0024] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0025] Figure 3 It is a structural schematic diagram of the push rod in the present invention;

[0026] Figure 4 It is a structural schematic diagram of the bending assembly in the present invention;

[0027] Figure 5 It is a structural schematic diagram of the pushing block in the present invention;

[0028] Figure 6 Schematic diagram of the structure of the auxiliary components in the present invention;

[0029] Figure 7 It is a structural schematic diagram of the installation shaft in the present invention;

[0030] Figure 8 It is a structural schematic diagram of the positioning component in the present invention;

[0031] Figure 9 It is a schematic structural diagram of the positioning wheel and the bending wheel in the present invention.

[0032] In the figure: 1. Device base; 2. Positioning wheel; 3. Connecting rod; 4. Mounting frame; 5. Bending wheel; 6. Hydraulic cylinder; 7. Pushing frame; 8. Pushing block; 9. First bearing; 10. Linking shaft; 11. Bending gear; 12. Tooth plate; 13. Limiting block; 14. Pushing slot; 15. Limiting slot; 16. Frame slot; 17. Linking frame; 18. Connecting plate; 19. Stabilizing block; 20. Stabilizing slot; 21. Stabilizing slide block; 22. Stabilizing slide slot; 23. L 2. Push plate; 24. Gear block group; 25. Second bearing; 26. Mounting shaft; 27. Auxiliary gear; 28. Rotating block; 29. ​​Auxiliary plate; 30. Auxiliary surface; 31. U-shaped fixed plate; 32. Translation groove; 33. Translation block; 34. Clamping block; 35. Third bearing; 36. Adjusting screw; 37. Adjusting handle; 38. Mounting block; 39. Lower wheel body; 40. Fourth bearing; 41. Lifting screw; 42. Hexagonal handle; 43. Upper wheel body; 44. Cylindrical rod. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] See also Figures 1-9 The present invention is a bending test device for metal sheets for automobile bodies, comprising a device base 1, on which a positioning wheel 2 is fixedly mounted, and a positioning assembly is provided on the upper end surface of the device base 1, through which the metal sheet to be bent is fixed, a connecting rod 3 is fixedly mounted on the side end surface of the device base 1, and a mounting frame 4 is fixedly mounted on the end of the connecting rod 3 away from the device base 1, on which a bending assembly is provided, and on which symmetrically arranged bending wheels 5 are provided, wherein the positioning wheel 2 is fixedly mounted on the device base 1 through a positioning shaft, and the positioning wheel 2 and the two bending wheels 5 are on the same horizontal plane;

[0035] The bending assembly includes a hydraulic cylinder 6 fixedly mounted on the mounting plate 4, the output rod of the hydraulic cylinder 6 is fixedly mounted with a push frame rod 7, the end of the push frame rod 7 is fixedly mounted with a push block 8, the push block 8 is fixedly mounted with a first bearing 9, the first bearing 9 is fixedly mounted with a linkage shaft 10, one end of the linkage shaft 10 is fixedly mounted with a bending gear 11, the lower end surface of the device base 1 is fixedly mounted with a symmetrically arranged tooth plate 12, the outer side surface of the push block 8 is fixedly mounted with a limited block 13, and the device base 1 is provided with a symmetrically arranged push groove 14. A limiting groove 15 is provided on the inner side surface of the groove 14, and a rack groove 16 is provided on the side end surface of the device base 1. The bending wheel 5 is fixedly mounted on the other end of the linkage shaft 10. The bending wheel 5 is positioned above the device base 1. The two bending wheels 5 and the positioning wheel 2 are in the form of a triangle. The rack groove 16 is connected to the pushing groove 14. The pushing block 8 is slidably installed with the pushing groove 14, and the limiting block 13 is slidably installed with the limiting groove 15. The limiting block 13 slides within the limiting groove 15 to ensure that the pushing block 8 does not fall off when sliding within the pushing groove 14.

[0036] In this embodiment, the metal sheet to be bent is placed between the positioning wheel 2 and the two bending wheels 5, and then the metal sheet is fixed by the positioning assembly. The hydraulic cylinder 6 drives the pushing frame rod 7 to move horizontally, and the pushing frame rod 7 pushes the pushing block 8 to slide within the pushing groove 14. The bending wheel 5 on the pushing block 8 will move horizontally. At the same time, when the pushing block 8 moves horizontally, the bending gear 11 on the pushing block 8 will cooperate with the tooth plate 12, and the bending gear 11 will drive the bending wheel 5 to rotate through the connecting shaft 10. Since the direction of rotation of the bending wheel 5 is the same as the bending direction of the metal sheet, the bending effect can be effectively increased, because the rotation of the rotating wheel helps to apply uniform pressure, avoids uneven stress concentration on the metal sheet, and reduces the possibility of deformation or damage.

[0037] The positioning assembly includes a translation slot 32 provided on the device base 1, and a translation block 33 is slidably installed inside the translation slot 32, and a clamping block 34 is fixedly installed on the translation block 33. A third bearing 35 is fixedly installed on the side end surface of the clamping block 34, and an adjusting screw rod 36 is fixedly installed on the third bearing 35. An adjusting handle 37 is fixedly installed on the end of the adjusting screw rod 36 away from the third bearing 35. A mounting block 38 is fixedly installed on the device base 1. The clamping block 34 is located on one side of the positioning wheel 2 and is on the same horizontal line as the positioning wheel 2. The end of the adjusting screw rod 36 away from the third bearing 35 extends to one side of the mounting block 38, and the adjusting screw rod 36 is threadedly installed on the mounting block 38, wherein a threaded hole is provided on the mounting block 38, and the adjusting screw rod 36 is threadedly installed on the mounting block 38 through the threaded hole. Since the shape of the threaded hole and the matching between the adjusting screw rod 36 are technologies well known to people in this field, they will not be described in detail here.

[0038] In this embodiment, by rotating the adjustment handle 37 and utilizing the cooperation between the adjustment screw 36 and the mounting block 38, the adjustment screw 36 is caused to rotate horizontally on the mounting block 38. Then, by utilizing the cooperation between the adjustment screw 36 and the third bearing 35, and the cooperation between the translation block 33 and the translation slot 32, the clamping block 34 on the translation block 33 is caused to move horizontally. By adjusting the position of the clamping block 34, the metal sheet to be bent can be effectively fixed to ensure that the metal sheet will not be displaced, thereby avoiding affecting the bending accuracy of the metal sheet.

[0039] The upper end surface of the pushing frame rod 7 is fixedly installed with a linkage frame rod 17, and the side end surface of the linkage frame rod 17 is fixedly installed with a symmetrically arranged connecting plate 18, and the end of the connecting plate 18 is fixedly installed with a stabilizing block 19, and the outer side surface of the stabilizing block 19 is provided with a stabilizing groove 20, and the lower end surface of the stabilizing block 19 is fixedly installed with a stabilizing slider 21. The upper end surface of the device base 1 and the outer side of the pushing groove 14 are provided with a stabilizing slide groove 22. The positions of the two stabilizing blocks 19 are at the outer sides of the positioning wheel 2, and the position of the stabilizing block 19 is at one side of the bending wheel 5. The stabilizing slider 21 is slidably installed in the inside of the stabilizing slide groove 22, wherein the position of the stabilizing block 19 is at the outer side of the clamping block 34, and when the stabilizing block 19 is in the specified position during movement, it is in a fit state with the side end surface of the clamping block 34. The clamping groove on the clamping block 34 cooperates with the stabilizing groove 20 on the stabilizing block 19, which can effectively fit and position the turning point of the metal sheet after bending.

[0040] In this embodiment, when the push rod 7 moves horizontally, it will drive the linkage rod 17 to move synchronously, and then the connecting plate 18 on the linkage rod 17 will drive the horizontal movement of the stabilizing block 19. The stabilizing groove 20 on the stabilizing block 19 will fit on the metal sheet after the angle bending. The cooperation between the stabilizing block 19 and the clamping block 34 further improves the fixing ability of the metal sheet, avoiding the position offset or unevenness of the metal sheet during the bending process.

[0041] The device base 1 is provided with an auxiliary component, which is used to position the metal sheet during the bending process. The auxiliary component includes an L-shaped push plate 23 fixedly mounted on the push frame rod 7, and a symmetrically arranged tooth block group 24 is fixedly mounted on the side end surface of the L-shaped push plate 23. A second bearing 25 is fixedly mounted on the device base 1, and a mounting shaft 26 is fixedly mounted on the second bearing 25. An auxiliary gear 27 is fixedly mounted on the bottom end of the mounting shaft 26, and a rotating block 28 is fixedly mounted on the top end of the mounting shaft 26. An auxiliary plate 29 is fixedly installed, and an auxiliary surface 30 is provided on the side end face of the auxiliary plate 29. A U-shaped fixed plate 31 is fixedly installed on the lower end face of the device base 1. The L-shaped push plate 23 is slidably installed with the U-shaped fixed plate 31, and the auxiliary gear 27 is engaged with the tooth block group 24 on the L-shaped push plate 23. The auxiliary plate 29 is in an inclined state. The inclined auxiliary plate 29 is used to ensure that the end of the metal sheet bent at a certain angle will be on the inner side of the auxiliary plate 29, and the auxiliary plate 29 will not affect the bending of the metal sheet.

[0042] In this embodiment, when the push rod 7 is in the process of continuous movement, it will synchronously drive the L-shaped push plate 23 to move horizontally. At this time, the two ends of the metal sheet will rotate at an angle, and the two ends of the metal sheet are on the inner side of the two auxiliary plates 29. The tooth block group 24 on the L-shaped push plate 23 will engage with the auxiliary gear 27 on the mounting shaft 26. By utilizing the positioning of the second bearing 25, the mounting shaft 26 will drive the auxiliary plate 29 on the rotating block 28 to rotate synchronously inward when rotating. By utilizing the auxiliary surface 30 on the auxiliary plate 29 to fit in contact with the metal sheet, the metal sheet can be effectively prevented from being offset due to lack of support during the bending process, thereby maintaining the precise bending shape of the metal sheet.

[0043] The positioning wheel 2 and the bending wheel 5 both include a lower wheel body 39, on which a fourth bearing 40 is fixedly mounted, and a lifting screw 41 is fixedly mounted on the fourth bearing 40, and a hexagonal handle 42 is fixedly mounted on the top of the lifting screw 41, and an upper wheel body 43 is movably mounted on the lifting screw 41, and a cylindrical rod 44 is fixedly mounted on the upper end surface of the lower wheel body 39, and the upper wheel body 43 and the cylindrical rod 44 are slidably mounted, wherein the lower wheel body 39 on the positioning wheel 2 is fixedly mounted on the device base 1, and the lower wheel body 39 on the bending wheel 5 is fixedly mounted on the linkage shaft 10.

[0044] In this embodiment, when metal sheets of different widths need to be bent, the hexagonal handles 42 on the positioning wheel 2 and the bending wheel 5 are used to drive the lifting screw 41 to rotate, and the lifting screw 41 is used to cooperate with the upper wheel body 43, and the upper wheel body 43 and the cylindrical rod 44 are used to limit the height of the upper wheel body 43. By adjusting the distance between the lower wheel body 39 and the upper wheel body 43, the wheel grooves on the positioning wheel 2 and the bending wheel 5 are used to limit the metal sheet, which facilitates the bending of the metal sheet and effectively improves the use effect of the positioning wheel 2 and the bending wheel 5.

[0045] Working principle: When in use, the metal sheet to be bent is placed between the positioning wheel 2 and the two bending wheels 5. By rotating the adjusting handle 37 and utilizing the cooperation between the adjusting screw rod 36 and the mounting block 38, the adjusting screw rod 36 is rotated horizontally on the mounting block 38. Then, by utilizing the cooperation between the adjusting screw rod 36 and the third bearing 35, and the cooperation between the translation block 33 and the translation slot 32, the clamping block 34 on the translation block 33 is moved horizontally. By adjusting the position of the clamping block 34, the metal sheet to be bent can be effectively fixed. Then, the hydraulic cylinder 6 drives the pushing frame rod 7 to move horizontally, and the pushing frame rod 7 pushes the pushing block 8 to be confined in the pushing slot 14. The bending wheel 5 on the pushing block 8 slides horizontally. At the same time, when the pushing block 8 moves horizontally, the bending gear 11 on the pushing block 8 cooperates with the tooth plate 12, and the bending gear 11 drives the bending wheel 5 to rotate through the linkage shaft 10. Since the direction of rotation of the bending wheel 5 is the same as the direction of bending of the metal sheet, the effect of the pipe bending can be effectively increased. Because the rotation of the runner helps to apply uniform pressure, it avoids uneven stress concentration on the metal sheet and reduces the possibility of deformation or damage. In the process of pushing the frame rod 7 to move horizontally, it will drive the linkage frame rod 17 to move synchronously, and then use the connecting plate 18 on the linkage frame rod 17 to drive the horizontal movement of the stable block 19. The stabilizing groove 20 on 19 will fit on the metal sheet after the angle bending, and the cooperation between the stabilizing block 19 and the clamping block 34 will further improve the fixing ability of the metal sheet. When the push rod 7 is continuously moved, it will synchronously drive the L-shaped push plate 23 to move horizontally. At this time, the two ends of the metal sheet will rotate at an angle, and the two ends of the metal sheet are on the inner side of the two auxiliary plates 29. The tooth block group 24 on the L-shaped push plate 23 will mesh with the auxiliary gear 27 on the mounting shaft 26. With the positioning of the second bearing 25, the mounting shaft 26 will drive the auxiliary plate 29 on the rotating block 28 to rotate synchronously inward when rotating, and the auxiliary surface 30 on the auxiliary plate 29 will be used to engage with the metal sheet. The close contact can effectively prevent the metal sheet from deflecting due to lack of support during the bending process, thereby maintaining the precise bending shape of the metal sheet. When metal sheets of different widths need to be bent, the hexagonal handle 42 on the positioning wheel 2 and the bending wheel 5 drives the lifting screw 41 to rotate, and the cooperation between the lifting screw 41 and the upper wheel body 43, as well as the limitation of the upper wheel body 43 and the cylindrical rod 44, the height of the upper wheel body 43 is adjusted. By adjusting the distance between the lower wheel body 39 and the upper wheel body 43, the wheel grooves on the positioning wheel 2 and the bending wheel 5 limit the metal sheet, which is convenient for bending the metal sheet and effectively improves the use effect of the positioning wheel 2 and the bending wheel 5.

[0046] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0047] While the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and alterations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A bending test device for metal sheets for automobile bodies, comprising a device base (1), characterized in that: A positioning wheel (2) is fixedly mounted on the device base (1), and a positioning assembly is provided on the upper end surface of the device base (1), and the metal sheet to be bent is fixed by the positioning assembly; A connecting rod (3) is fixedly mounted on the side end surface of the device base (1); a mounting frame (4) is fixedly mounted on one end of the connecting rod (3) away from the device base (1); a bending assembly is provided on the mounting frame (4); and symmetrically arranged bending wheels (5) are provided on the bending assembly. An auxiliary component is provided on the device base (1), and the metal sheet is positioned during the bending process by means of the auxiliary component; The bending assembly comprises a hydraulic cylinder (6) fixedly mounted on a mounting frame (4), an output rod of the hydraulic cylinder (6) fixedly mounted with a push frame rod (7), an end of the push frame rod (7) fixedly mounted with a push block (8), a first bearing (9) fixedly mounted on the push block (8), a linkage shaft (10) fixedly mounted on the first bearing (9), a bending gear (11) fixedly mounted on one end of the linkage shaft (10), and a symmetrically arranged toothed plate (12) fixedly mounted on the lower end surface of the device base (1); A limit block (13) is fixedly mounted on the outer side surface of the pushing block (8), symmetrically arranged pushing grooves (14) are provided on the device base (1), a limit groove (15) is provided on the inner side surface of the pushing groove (14), and a rack rod groove (16) is provided on the side end surface of the device base (1); The bending wheel (5) is fixedly mounted on the other end of the linkage shaft (10), and the bending wheel (5) is located above the device base (1). The two bending wheels (5) and the positioning wheel (2) are in the shape of a triangle. The rack slot (16) is connected to the push slot (14), the push block (8) is slidably mounted on the push slot (14), and the limit block (13) is slidably mounted on the limit slot (15). The upper end surface of the pushing frame rod (7) is fixedly mounted with a linkage frame rod (17), the side end surface of the linkage frame rod (17) is fixedly mounted with a symmetrically arranged connecting plate (18), the end of the connecting plate (18) is fixedly mounted with a stabilizing block (19), the outer side surface of the stabilizing block (19) is provided with a stabilizing groove (20), the lower end surface of the stabilizing block (19) is fixedly mounted with a stabilizing slide block (21), and the upper end surface of the device base (1) and the outer side of the pushing groove (14) are provided with a stabilizing slide groove (22); The two stabilizing blocks (19) are located outside the positioning wheel (2), the stabilizing block (19) is located on one side of the bending wheel (5), and the stabilizing slider (21) is slidably mounted inside the stabilizing slide groove (22).

2. A bending test device for metal sheets for automobile bodies according to claim 1, characterized in that: The auxiliary component comprises an L-shaped push plate (23) fixedly mounted on the push frame rod (7), a symmetrically arranged tooth block group (24) fixedly mounted on the side end surface of the L-shaped push plate (23), a second bearing (25) fixedly mounted on the device base (1), a mounting shaft (26) fixedly mounted on the second bearing (25), an auxiliary gear (27) fixedly mounted on the bottom end of the mounting shaft (26), a rotating block (28) fixedly mounted on the top end of the mounting shaft (26), an auxiliary plate (29) fixedly mounted on the rotating block (28), and an auxiliary surface (30) provided on the side end surface of the auxiliary plate (29).

3. The bending test device for metal sheets for automobile bodies according to claim 2, characterized in that: A U-shaped fixed plate (31) is fixedly mounted on the lower end surface of the device base (1), the L-shaped push plate (23) is slidably mounted on the U-shaped fixed plate (31), and the auxiliary gear (27) is meshed with the tooth block group (24) on the L-shaped push plate (23).

4. The bending test device for metal sheets for automobile bodies according to claim 1, characterized in that: The positioning assembly includes a translation groove (32) provided on the device base (1), a translation block (33) is slidably mounted inside the translation groove (32), a clamping block (34) is fixedly mounted on the translation block (33), a third bearing (35) is fixedly mounted on the side end surface of the clamping block (34), an adjusting screw rod (36) is fixedly mounted on the third bearing (35), an adjusting handle (37) is fixedly mounted on the end of the adjusting screw rod (36) away from the third bearing (35), a mounting block (38) is fixedly mounted on the device base (1), the clamping block (34) is located on one side of the positioning wheel (2) and is on the same horizontal line as the positioning wheel (2), the end of the adjusting screw rod (36) away from the third bearing (35) extends to one side of the mounting block (38), and the adjusting screw rod (36) is threadedly mounted on the mounting block (38).

5. The bending test device for metal sheets for automobile bodies according to claim 4, characterized in that: The positioning wheel (2) and the bending wheel (5) both include a lower wheel body (39), a fourth bearing (40) is fixedly mounted on the lower wheel body (39), a lifting screw (41) is fixedly mounted on the fourth bearing (40), a hexagonal handle (42) is fixedly mounted on the top end of the lifting screw (41), an upper wheel body (43) is movably mounted on the lifting screw (41), a cylindrical rod (44) is fixedly mounted on the upper end surface of the lower wheel body (39), and the upper wheel body (43) and the cylindrical rod (44) are slidably mounted.

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