Refrigerator shell top 45-degree U angle punching forming machine

Abstract

The utility model relates to the technical field of household appliance manufacturing, in particular to a refrigerator shell top 45-degree U angle punching forming machine. The two sets of bending devices are symmetrically arranged and fixed to the frame body, each bending device comprises a bending module, an auxiliary arm assembly and a bending servo motor, each bending module comprises an upper pressing cutter, a lower fixing die, a bending die and a bending plate, the upper pressing cutter is provided with an inclined face, the lower fixing die corresponds to the upper pressing cutter, the bending die is fixed to the bending plate, and the auxiliary arm assembly is arranged on the upper pressing cutter. The auxiliary arm assembly comprises an auxiliary arm, an auxiliary arm air cylinder and an air cylinder seat, the auxiliary arm is hinged to the side face of the bending plate, the air cylinder seat is fixed to the lower face of the bending plate, the bending servo motor drives the bending plate, the bending die connected with the bending plate and the auxiliary arm assembly to rotate, and the lifting device comprises a lifting air cylinder and a lifting part. When the auxiliary arm rotates to the position 45 degrees away from the horizontal plane for the first time, the lifting air cylinder pushes the lifting part to the position to lift the plate; the mold has the advantages of being stable in forming and not prone to deformation.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliance manufacturing, in particular to a 45° U-angle forming machine for punching the top of a refrigerator shell. Background Art

[0002] At present, refrigerator shells are usually formed by stamping and bending. During the forming process, the top of the shell generally adopts a 90° angle, that is, a cylinder is used as the bending power to form an angle of fixed angle. The forming mechanism on the top of the refrigerator shell uses the upper pressing knife as a forming tool and also uses it to press the sheet. When the bending device moves to the middle, there is no device to fix the sheet, and the position of the sheet may change, resulting in an error in the folding position. During the forming process, in addition to the auxiliary arm supporting the sheet during bending, the auxiliary arm returns to its original position after the bending action is completed. The sheet is in a suspended state, the angle is open, the processing error increases, and the qualified rate of the product is reduced. Summary of the invention

[0003] In order to solve the deficiencies in the prior art, the utility model provides a 45° U-angle forming machine for punching the top of a refrigerator shell, which has the advantages of stable forming and not easy to deform.

[0004] The above utility model object of the utility model is achieved through the following technical solutions:

[0005] The utility model provides a 45° U-angle forming machine for punching the top of a refrigerator shell, comprising:

[0006] Frame;

[0007] A bending device, wherein the bending device is symmetrically arranged in two groups, the bending device is fixed on the frame, the bending device comprises a bending module group, an auxiliary arm assembly and a bending servo motor, the bending module group comprises an upper pressing knife, a lower fixed die, a bending die and a bending plate, the upper pressing knife is provided with an inclined surface, the lower fixed die corresponds to the upper pressing knife, the bending die is fixed on the upper surface of the bending plate, the auxiliary arm assembly comprises an auxiliary arm, the auxiliary arm is hingedly connected to the side surface of the bending plate, and the bending servo motor drives the bending plate and the bending die and auxiliary arm assembly connected thereto to rotate at an angle of 45°;

[0008] And a lifting device, which is symmetrically arranged in two groups. The lifting device includes a lifting cylinder and a lifting part. The output end of the lifting cylinder is fixedly connected to the lifting part. When the auxiliary arm rotates to a position of 45° to the horizontal plane for the first time, the lifting cylinder pushes the lifting part to this position to lift the sheet metal.

[0009] By adopting the above technical scheme, the sheet material after stamping and rolling is transported to the frame, the adjacent bending die set and auxiliary arm assembly are in the first position, the upper pressing knife presses the sheet material, the bending servo motor starts and drives the bending die and auxiliary arm assembly on the bending plate to rotate to a 45° angle with the horizontal position. At this time, under the joint action of the bending die and the upper pressing knife, the sheet material is bent for the first time from a straight state to a state with a 45° angle with the horizontal plane; the lifting cylinder is actuated to push the lifting part until it abuts against the sheet material, and the lifting part lifts the sheet material that is bent 45° for the first time; then, the bending servo motor reverses and drives the bending die and auxiliary arm assembly on the bending plate to return to the original horizontal position, and the upper pressing knife rises to release the clamping of the sheet material; the two sets of bending devices move toward each other to the second position, and the auxiliary arm It rotates independently to a 45° angle with the horizontal plane. At this time, the auxiliary arm lifts the sheet material that has been bent for the first time, the lifting cylinder retracts and drives the lifting part to return to its original position, and then the upper pressing knife moves down to press the sheet material again. The distance between the second position and the first position is the set distance, and the bending servo motor operates again to bend the sheet material at a 45° angle again. At this time, the U-angle forming of the top of the refrigerator shell is completed after two bending actions, and the upper pressing knife rises to release the clamping of the sheet material that has completed the top forming, and the sheet material can enter the next process. The utility model of the refrigerator shell punching top 45° U-angle forming machine, two 45° bends to form a U-angle forming, under the cooperation of the lifting device and the auxiliary arm, the deformation caused by the sagging of the sheet material due to its own weight before the second bending action is avoided, the forming is stable, and the yield rate is high.

[0010] Furthermore, it also includes a clamping device, which includes an upper clamping part and a lower clamping part corresponding to each other, the upper clamping part includes an upper clamping cylinder and an upper clamping frame, the upper clamping cylinder is fixed on the upper clamping frame, and the top end of the lower clamping part abuts against the bottom surface of the sheet.

[0011] By adopting the above technical solution, in the process of bending to form a U-angle, when the sheet reaches the first position on the frame, the lower clamping part of the clamping device abuts against the bottom surface of the sheet, the upper clamping cylinder fixed on the upper clamping frame is started, and the piston rod of the upper clamping cylinder is extended to abut against the surface of the sheet. The clamping device fixes the sheet in the same position until the bending process is completed, and the piston rod of the upper clamping cylinder retracts to release the restriction on the formed sheet.

[0012] Furthermore, the angle between the inclined surface of the upper pressing knife and the horizontal direction is ∠α, 60°≤α<90°, and the cross-section of the end of the upper pressing knife away from the sheet material is in an inverted dovetail shape.

[0013] By adopting the above technical solution, when the bending servo motor drives the bending plate and the bending die connected thereto to rotate, the sheet material is bent to a predetermined angle, and the setting of the upper pressing knife inclined surface prevents the sheet material from interfering with it, thereby forming a precise U angle.

[0014] Furthermore, a plurality of first buffer portions are arranged on the auxiliary arm, and the plurality of first buffer portions are arranged at equal intervals on a surface of the auxiliary arm facing the sheet material.

[0015] Furthermore, the first buffer portion is a suction cup, an anti-collision strip or an elastic gasket.

[0016] By adopting the above technical solution, when the bending servo motor drives the auxiliary arm on the bending plate to move, the first buffer part can prevent the auxiliary arm from directly contacting the sheet material, avoid pits, scratches or other defects caused by the auxiliary arm hitting the sheet material, and reduce the defect rate of the bending process.

[0017] Furthermore, the frame includes a stand, the upper end of the stand is fixedly connected to a clamping cylinder, the stand is slidably connected to a crossbeam, a crossbeam connecting seat is fixed to a side of the crossbeam close to the stand, the crossbeam connecting seat is fixedly connected to an output end of the clamping cylinder, the lower end of the beam is fixedly connected to an upper pressing knife fixing block, a side of the upper pressing knife fixing block facing away from the beam is provided with an upper pressing knife through groove, and the upper end portion of the upper pressing knife is embedded in the upper pressing knife through groove.

[0018] By adopting the above technical solution, when the clamping cylinder is started, the crossbeam can be driven to move up and down in the vertical direction along the stand, further driving the upper press knife fixing block and the upper press knife to move up and down in the vertical direction to clamp and fix the sheet material or release the restriction on it.

[0019] Furthermore, the output end of the bending servo motor is fixedly connected to a driving shaft, and the driving shaft is fixed to the frame through a bearing seat. Both ends of the driving shaft are respectively fixedly connected to a driving wheel, and the driving wheel is rotatably connected to a driven wheel through a gear shaft, and the driven wheel and the bending plate are fixedly connected through a rotating shaft.

[0020] By adopting the above technical solution, the bending servo motor can accurately control the rotation angle of the bending plate and the bending die thereon to form a U angle with a precise angle.

[0021] Furthermore, the auxiliary arm assembly also includes an auxiliary arm cylinder and a cylinder seat, the output end of the auxiliary arm cylinder is hinged to the auxiliary arm, the cylinder seat is fixed under the bending plate, and the auxiliary arm cylinder can drive the auxiliary arm to rotate at an angle of 45°.

[0022] By adopting the above technical solution, the auxiliary arm can not only rotate with the bending plate, but also can be driven by the auxiliary arm cylinder to independently rotate a certain angle. The cylinder is used as the power to change the angle of the auxiliary arm, which can effectively support the sheet material that forms a certain angle after the first bending, thereby reducing the deformation of the sheet material.

[0023] Furthermore, a second buffer portion is provided at the upper end of the lifting portion, and the second buffer portion is detachably connected to the lifting portion.

[0024] By adopting the above technical solution, when the lifting part contacts the sheet material, the buffer part can prevent the lifting part from scratching the sheet material, thereby improving the forming yield rate of the sheet material.

[0025] Furthermore, a third buffer portion is provided at the top of the output end of the upper pressing cylinder.

[0026] By adopting the above technical solution, when the clamping device clamps the sheet material, direct contact between the output end of the upper clamping cylinder and the sheet material to produce pitting, bumps and other undesirable phenomena is avoided.

[0027] To sum up, the utility model includes at least one of the following beneficial technical effects: the utility model of the refrigerator shell punching top 45° U-angle forming machine changes the original 90° angle structure of the sheet material, and through the coordinated use of the auxiliary arm and the lifting device, it can be bent twice at 45° to form a precise U-angle. Lifting the bent sheet material can avoid changes in the angle after bending and avoid deformation of the sheet material. By setting the structure of the upper pressing knife, when the sheet material is in the second position, the distance from the sheet material can be pulled away to avoid interference between the upper pressing knife and the sheet material, thereby improving the yield rate of the sheet material bending process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of this embodiment;

[0029] Figure 2 is a schematic diagram of the structure of the bending device in this embodiment;

[0030] Figure 3 Schematic diagram of the structure of the lifting device and the pressing device in this embodiment;

[0031] Figure 4 Schematic diagram of the auxiliary arm structure in this embodiment;

[0032] Figure 5 is a schematic diagram of the bending assembly structure in this embodiment;

[0033] Figure 6 It is a schematic diagram of the shell structure of the present embodiment folded into a 45° U angle.

[0034] In the figure, 1, frame; 11, stand; 12, clamping cylinder; 13, crossbeam; 14, crossbeam connecting seat; 15, upper pressing knife fixing block; 16, upper pressing knife through groove; 2, bending device; 21, bending die set; 211, upper pressing knife; 212, lower fixed die; 213, bending die; 214 bending plate; 22, auxiliary arm assembly; 221, auxiliary arm; 222, auxiliary arm cylinder; 223; A buffer part; 224 cylinder seat; 23, bending servo motor; 24, driving shaft; 25, bearing seat; 26, driving wheel; 27, gear shaft; 28, driven wheel; 29, rotating shaft; 3, lifting device; 31, lifting cylinder; 32, lifting part; 33, second buffer part; 4, clamping device; 41, upper clamping part; 411, upper clamping cylinder; 412, upper clamping frame; 42, lower clamping part. DETAILED DESCRIPTION

[0035] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0036] To facilitate those skilled in the art to understand the present invention, specific implementations of the present invention are described below with reference to the accompanying drawings.

[0037] Reference Figure 1-6 The utility model discloses a 45° U-angle forming machine for punching the top of a refrigerator shell, comprising a frame 1, a bending device 2 and a lifting device 3.

[0038] The frame 1 includes a stand 11, the upper end of the stand 11 is fixedly connected to a clamping cylinder 12, the stand 11 is slidably connected to a beam 13, a beam connecting seat 14 is fixed to a side of the beam 13 close to the stand 11, the beam connecting seat 14 is fixedly connected to the output end of the clamping cylinder 12, the lower end of the beam 13 is fixedly connected to an upper pressing knife fixing block 15, and an upper pressing knife through groove 16 is provided on a side of the upper pressing knife fixing block 15 facing away from the beam 13.

[0039] The bending device 2 is symmetrically arranged with two groups. The bending device 2 is fixed on the frame 1. The bending device 2 includes a bending module 21, an auxiliary arm assembly 22 and a bending servo motor 23. The bending module 21 includes an upper pressing knife 211, a lower fixed die 212, a bending die 213 and a bending plate 214. The upper pressing knife 211 is provided with an inclined surface. The lower fixed die 212 corresponds to the upper pressing knife 211. The bending die 213 is fixed on the upper surface of the bending plate 214. The auxiliary arm assembly 22 includes an auxiliary arm 221, an auxiliary arm cylinder 222, a first buffer portion 223 and a cylinder seat 224. The arm 221 is connected to the side of the bending plate 214 in an articulated manner, and the cylinder seat 224 is fixed under the bending plate 214. The bending servo motor 23 drives the bending plate 214 and the bending die 213 and the auxiliary arm assembly 22 connected thereto to rotate 45°. The auxiliary arm 221 can not only rotate together with the bending plate 214, but also can be rotated 45° by the auxiliary arm cylinder 222 of the auxiliary arm assembly 22. The cylinder is used as a power to change the angle of the auxiliary arm 221, which can effectively support the sheet metal that forms a certain angle after the first folding, thereby reducing the deformation of the sheet metal.

[0040] The angle between the inclined surface of the upper pressing knife 211 and the horizontal direction is ∠α, 60°≤α<90°, in this embodiment, ∠α=70°, the cross section of the end of the upper pressing knife 211 away from the sheet material is dovetail-shaped, and the dovetail-shaped part of the upper end of the upper pressing knife 211 is embedded in the upper pressing knife through groove 16. When the bending servo motor 23 drives the bending plate 214 and the bending die 213 connected thereto to rotate, the sheet material is bent to a predetermined angle, and the setting of the inclined surface of the upper pressing knife 211 prevents the sheet material from interfering with it, thereby forming a precise U angle.

[0041] When the clamping cylinder 12 is started, the crossbeam 13 can be driven to move up and down in the vertical direction along the stand 11, and the upper pressing knife fixing block 15 and the upper pressing knife 211 can be further driven to move up and down in the vertical direction to clamp and fix the sheet material or release the restriction thereon.

[0042] The auxiliary arm 221 is provided with a plurality of first buffer portions 223, which are arranged at equal intervals on the side of the auxiliary arm 221 facing the sheet material. When the bending servo motor 23 drives the auxiliary arm 221 on the bending plate 214 to move, the first buffer portion 223 can prevent the auxiliary arm 221 from directly contacting the sheet material, and avoid pits, scratches or other defects caused by the auxiliary arm 221 hitting the sheet material, thereby reducing the defect rate of the bending process. The first buffer portion 223 can be a suction cup, an anti-collision strip or an elastic gasket. In this embodiment, the first buffer portion 223 is a suction cup.

[0043] The output end of the bending servo motor 23 is fixedly connected to a driving shaft 24, and the driving shaft 24 is fixed to the frame 1 through a bearing seat 25. The two ends of the driving shaft 24 are respectively fixedly connected to a driving wheel 26, and the driving wheel 26 is rotatably connected to a driven wheel 28 through a gear shaft 27. The driven wheel 28 is fixedly connected to the bending plate 214 through a rotating shaft 29. The bending servo motor 23 can accurately control the rotation angle of the bending plate 214 and the bending die 213 thereon to form a U angle of a precise angle.

[0044] There are two groups of lifting devices 3 symmetrically arranged, and the two groups of lifting devices 3 are respectively arranged on the outside of the bending device 2 on the same side thereof. The lifting devices 3 include a lifting cylinder 31 and a lifting part 32. The output end of the lifting cylinder 31 is fixedly connected to the lifting part 32. When the auxiliary arm 221 rotates to a position of 45° with the horizontal plane for the first time, the lifting cylinder 31 pushes the lifting part 32 to this position to lift the sheet material, thereby avoiding deformation caused by the sheet material sagging due to its own weight before the secondary bending action.

[0045] The upper end of the lifting part 32 is provided with a second buffer part 33, and the second buffer part 33 is detachably connected to the lifting part 32. When the lifting part 32 abuts against the sheet material, the buffer part can prevent the lifting part 32 from scratching the sheet material, thereby improving the molding yield rate of the sheet material.

[0046] The 45° U-angle forming machine for the top of the refrigerator shell of the utility model also includes a clamping device 4, which includes an upper clamping part 41 and a lower clamping part 42 corresponding to each other, and the upper clamping part 41 includes an upper clamping cylinder 411 and an upper clamping frame 412. The upper clamping cylinder 411 is fixed on the upper clamping frame 412, and the top of the lower clamping part 42 abuts against the bottom surface of the sheet. When the sheet reaches the first position on the frame 1, the lower clamping part 42 of the clamping device 4 abuts against the bottom surface of the sheet, and the upper clamping cylinder 411 fixed on the upper clamping frame 412 is started, and the piston rod of the upper clamping cylinder 411 extends to abut against the surface of the sheet, and the clamping device 4 fixes the sheet in the same position until the bending process is completed, and the piston rod of the upper clamping cylinder 411 retracts to release the restriction on the formed sheet. In order to avoid direct contact between the output end of the upper pressing cylinder 411 and the sheet material to produce pitting, bumps and other undesirable phenomena, a third buffer portion is provided at the top of the output end of the upper pressing cylinder 411 .

[0047] The implementation principle of this embodiment is as follows: the sheet material after stamping and rolling is transported to the frame 1, the adjacent bending die set 21 and auxiliary arm assembly 22 are in the first position, the upper pressing knife 211 presses the sheet material, the bending servo motor 23 starts and drives the bending die 213 and the auxiliary arm assembly 22 on the bending plate 214 to rotate to a 45° angle with the horizontal position. At this time, under the joint action of the bending die 213 and the upper pressing knife 211, the sheet material is bent for the first time from a straight state to a state at a 45° angle to the horizontal plane; the lifting cylinder 31 acts to push the lifting part 32 until it abuts against the sheet material, and the lifting part 32 lifts the sheet material that has been bent 45° for the first time; then, the bending servo motor 23 acts in the opposite direction, driving the bending die 213 and the auxiliary arm assembly 22 on the bending plate 214 to return to the original horizontal position, and the upper pressing knife 211 rises to release the clamping of the sheet material; the two sets of bending devices 2 move toward each other When the second position is reached, the auxiliary arm 221 rotates independently to a 45° angle with the horizontal plane. At this time, the auxiliary arm 221 lifts the sheet material that has been bent for the first time, the lifting cylinder 31 retracts and drives the lifting part 32 to return to its original position, and then the upper pressing knife 211 moves down to press the sheet material again. The distance between the second position and the first position is the set distance, and the bending servo motor 23 is activated again to bend the sheet material at a 45° angle again. At this time, the U-angle forming of the top of the refrigerator shell is completed after two bending actions, and the upper pressing knife 211 rises to release the clamping of the sheet material that has completed the top forming, and the sheet material can enter the next process; the utility model of the refrigerator shell punching top 45° U-angle forming machine, two 45° bends to form a U-angle forming, under the action of the mutual cooperation of the lifting device 3 and the auxiliary arm 221, the deformation caused by the sagging of the sheet material due to its own weight before the second bending action is avoided, the forming is stable, and the yield rate is high.

[0048] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] The above-described implementation methods of the utility model do not constitute a limitation on the protection scope of the utility model. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model shall be included in the protection scope of the claims of the utility model.

Claims

1. A 45° U-angle forming machine for the top of a refrigerator shell, characterized in that: include: Frame (1); The bending device (2) is symmetrically arranged in two groups. The bending device (2) is fixed on the frame (1). The bending device (2) comprises a bending module (21), an auxiliary arm assembly (22) and a bending servo motor (23). The bending module (21) comprises an upper pressing knife (211), a lower fixed die (212), a bending die (213) and a bending plate (214). The upper pressing knife (211) is provided with an inclined surface. The lower fixed die (212) corresponds to the upper pressing knife (211); the bending die (213) is fixed on the upper surface of the bending plate (214); the auxiliary arm assembly (22) comprises an auxiliary arm (221); the auxiliary arm (221) is connected to the side of the bending plate (214) in an articulated manner; the bending servo motor (23) drives the bending plate (214) and the bending die (213) and the auxiliary arm assembly (22) connected thereto to rotate at an angle of 45°; And a lifting device (3), wherein the lifting device (3) is symmetrically arranged with two groups, and the lifting device (3) comprises a lifting cylinder (31) and a lifting part (32), the output end of the lifting cylinder (31) is fixedly connected to the lifting part (32), and when the auxiliary arm (221) rotates to a position of 45 degrees to the horizontal plane for the first time, the lifting cylinder (31) pushes the lifting part (32) to this position to lift the sheet material.

2. The refrigerator shell punch top 45° U-angle forming machine according to claim 1, characterized in that: It also includes a clamping device (4), the clamping device (4) includes an upper clamping part (41) and a lower clamping part (42) corresponding to each other, the upper clamping part (41) includes an upper clamping cylinder (411) and an upper clamping frame (412), the upper clamping cylinder (411) is fixed on the upper clamping frame (412), and the top end of the lower clamping part (42) is in contact with the bottom surface of the sheet material.

3. The refrigerator shell punch top 45° U-angle forming machine according to claim 1, characterized in that: The angle between the inclined surface of the upper pressing knife (211) and the horizontal direction is ∠α, 60°≤α<90°, and the cross section of the end of the upper pressing knife (211) facing away from the sheet material is dovetail-shaped.

4. The refrigerator shell punch top 45° U-angle forming machine according to claim 1, characterized in that: The auxiliary arm (221) is provided with a plurality of first buffer portions (223), and the plurality of first buffer portions (223) are arranged at equal intervals on a surface of the auxiliary arm (221) facing the sheet material.

5. The refrigerator shell punch top 45° U-angle forming machine according to claim 1, characterized in that: The frame (1) comprises a stand (11), the upper end of the stand (11) is fixedly connected to a clamping cylinder (12), the stand (11) is slidably connected to a crossbeam (13), a crossbeam connecting seat (14) is fixedly connected to a side of the crossbeam (13) close to the stand (11), the crossbeam connecting seat (14) is fixedly connected to the output end of the clamping cylinder (12), the lower end of the crossbeam (13) is fixedly connected to an upper pressing knife fixing block (15), a side of the upper pressing knife fixing block (15) facing away from the crossbeam (13) is provided with an upper pressing knife through groove (16), and the upper end portion of the upper pressing knife (211) is embedded in the upper pressing knife through groove (16).

6. The refrigerator shell punch top 45° U-angle forming machine according to claim 1, characterized in that: The output end of the bending servo motor (23) is fixedly connected to a driving shaft (24), and the driving shaft (24) is fixed to the frame (1) through a bearing seat (25). The two ends of the driving shaft (24) are respectively fixedly connected to a driving wheel (26), and the driving wheel (26) is rotatably connected to a driven wheel (28) through a gear shaft (27). The driven wheel (28) is fixedly connected to the bending plate (214) through a rotating shaft (29).

7. The refrigerator shell punch top 45° U-angle forming machine according to claim 1, characterized in that: The auxiliary arm assembly (22) further comprises an auxiliary arm cylinder (222) and a cylinder seat (224); the output end of the auxiliary arm cylinder (222) is hinged to the auxiliary arm (221); the cylinder seat (224) is fixed under the bending plate (214); and the auxiliary arm cylinder (222) can drive the auxiliary arm (221) to rotate at an angle of 45°.

8. The refrigerator shell punch top 45° U-angle forming machine according to claim 1, characterized in that: A second buffer portion (33) is provided at the upper end of the lifting portion (32), and the second buffer portion (33) is detachably connected to the lifting portion (32).

9. The refrigerator shell punch top 45° U-angle forming machine according to claim 4, characterized in that: The first buffer portion (223) or the second buffer portion (33) may be a suction cup, an anti-collision strip or an elastic gasket.

10. The refrigerator shell punch top 45° U-angle forming machine according to claim 2, characterized in that: A third buffer portion is provided at the top of the output end of the upper pressing cylinder (411).

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