Pneumatic flanging machine and flanging method

Abstract

The present invention discloses a pneumatic flanging machine and a flanging method, which comprises an inner mold and an outer mold that can abut against each other, the outer mold comprises an upper mold body and a lower mold body, a lifting block is arranged in the lower mold body, and the top and bottom of the lifting block are both provided with wedge-shaped inclined surfaces, the upper mold body is slidably arranged on the lower mold body, and a connecting arm with a wedge-shaped inclined surface is arranged at its bottom, and a step notch with a wedge-shaped inclined surface is arranged on the inner mold body. In the present application, when the outer mold extrude the first folded edge of the top cover, the upper mold body is squeezed and moved by the outer wall of the first flanging to drive the connecting arm to slide in the lower mold body, and when the connecting arm slides, the lifting block rises under the action of the wedge-shaped inclined surface between the connecting arm and the lifting block, thereby pressing the second flanging into the shaping groove, and the deformation of the second flanging is increased by this extrusion, thereby offsetting its rebound deformation, ensuring that the second flanging is perpendicular to the first flanging after the rebound deformation, and meeting the design requirements.

Description

Technical Field

[0001] The invention relates to a pneumatic flanging device and a flanging method, in particular to a pneumatic flanging machine and a flanging method for a shell top cover of an insulated box. Background Art

[0002] With the rapid development of the outdoor leisure industry and the continuous improvement of people's living standards, people have higher and higher requirements for the refrigeration and insulation of food, so people use thermal insulation boxes for refrigeration and insulation; the internal metal shell of the thermal insulation box includes a bottom box and a top cover, the bottom box and the top cover are combined into a shell with an inner cavity, and the outside of the shell is wrapped with thermal insulation materials to form a thermal insulation box.

[0003] In order to install the bottom box and the top cover with the external thermal insulation material, it is generally necessary to stamp and flanging the openings of the two to form a folding structure. The folding structure is used to improve the convenience and stability of installation. The patent with application number CN201820221758.1 discloses a flanging forming machine for special-shaped products, including a frame, the frame is provided with a bottom fixed plate for placing workpieces, an inner mold and an outer mold, the inner mold is arranged on the bottom fixed plate, the outer mold is arranged on the periphery of the inner mold, and the inner mold is provided with an inner mold driving mechanism to drive the edge of the workpiece from the inside to the outside to fit the shape of the outer mold for flanging. The special-shaped product is placed on the bottom fixed plate, and the edge of the workpiece is expanded from the inside to the outside by the inner mold, so that the edge of the workpiece fits the shape of the outer mold for flanging. The device has a clever structure, is easy to operate and implement, can automatically complete flanging, has a high degree of automation, can effectively improve production efficiency and ensure the flanging quality of the workpiece.

[0004] However, a common problem of the stamped flanging structure after the flanging process is that the flanging rebounds and deforms, causing the flanging to fail to reach the required angle (usually 90°). Summary of the invention

[0005] Based on the disadvantage of the prior art that the folded edge of the punching type flanging machine is prone to rebound and deformation after flanging, the present invention provides a pneumatic flanging machine and a flanging method.

[0006] The technical solution adopted by the present invention to solve the above technical problems is:

[0007] The pneumatic flanging machine comprises a cabinet, a top block arranged in the middle of the cabinet countertop, a lifting cylinder arranged below the top block for driving the top block to rise and fall, an inner mold slidably arranged on the periphery of the top block, an outer mold slidably arranged on the periphery of the inner mold, a driving cylinder arranged on the outer side of the outer mold for driving the outer mold to move toward the inner mold, and a pneumatic pressing device arranged just above the top block for pressing the top cover to be flanging. The top block and the inner mold are provided with mutually matching guiding inclined surfaces. When the top block rises, the inner mold is pushed to move outward under the action of the guiding inclined surfaces. A step notch for flanging is provided on the outer bottom of the inner mold. A shaping groove is provided on the top of the step notch. The bottom of the shaping groove is an inclined surface and the depth gradually increases from the outside to the inside. The outer mold is slidably arranged on the machine table. The outer mold comprises a connecting seat and a lower mold body and an upper mold body stacked. The lower mold body is fixed on the base, a guide column is provided on the connecting seat, the upper mold body is slidably sleeved on the guide column and a reset spring for resetting the upper mold body is provided on the guide column, the lower mold body is provided with a connected horizontal slide groove and a T-shaped vertical slide groove or a vertical sliding groove, the inner end of the lower mold body is provided with a lifting block with a T-shaped sliding part, and the lifting block extends into the vertical slide groove through the sliding part and is slidably connected with the lower mold body or a lifting block is provided in the sliding groove, the top surface of the lifting block is provided with a shaping inclined surface that matches the shape of the bottom of the shaping groove, the bottom of the upper mold body is provided with a connecting arm extending into the sliding groove, and a guiding inclined surface that is abutted against each other is provided between the bottom of the lifting block and the connecting arm, and when the upper mold body retreats after being pressed, the connecting arm and the lifting block drive the lifting block to rise under the action of the guiding inclined surface and press the folded edge of the top cover into the shaping groove. Preferably, a step hole is opened in the upper mold body, the guide rod extends into the step hole, and a limit nut is threadedly connected at the end of the guide rod to prevent the upper mold body from falling off from the end of the guide rod. Preferably, in a natural state, the inner end face of the upper mold body is flush with the left end face of the lifting block. In this solution, when the outer mold extrude the first folded edge of the top cover, the upper mold body is squeezed and moved by the outer wall of the first flange, driving the connecting arm to slide in the lower mold body. When the connecting arm slides, the lifting block rises under the action of the guiding inclined surface between the connecting arm and the lifting block, thereby pressing the second flange into the shaping groove. The deformation of the second flange is increased by this extrusion, thereby offsetting its rebound deformation, ensuring that the second flange is perpendicular to the first flange after rebound deformation, and meeting the design requirements.

[0008] Specifically, the inner mold includes a left mold body, a left bevel mold body, a rear mold body, a right bevel mold body and a right mold body. When the top block is raised, the left mold body slides to the left, the left bevel mold body slides to the bevel of the left rear side, the rear mold body slides backward, the right bevel mold body slides to the bevel of the right rear side, and the right mold body slides to the right; mutually fitting guide inclined surfaces are provided between the left mold body and the left side of the top block, the rear mold body and the rear side of the top block, and the right mold body and the right side of the top block; a folded line extrusion notch is provided on the rear side of the left mold body and the left side of the rear mold body, and the left bevel mold body is provided with a guide inclined surface that fits with each other. The filling part cooperates with the extrusion notch, and the extrusion notches of the left mold body and the rear mold body squeeze the filling part of the left bevel mold body to drive the left bevel mold body to slide obliquely; the rear side of the right mold body and the right side of the rear mold body are provided with a broken line extrusion notch, and the right bevel mold body is provided with a filling part that cooperates with the extrusion notch, and the extrusion notches of the right mold body and the rear mold body squeeze the filling part of the right bevel mold body to drive the right bevel mold body to slide obliquely, and when each mold body is at the outer limit position, an annular structure is formed at the edge and the annular structure is against the inner wall surface of the first flange of the top cover. The sliding direction of the left bevel mold body is consistent with the direction of the diagonal line of the left rear side of the top surface of the top cover, and the sliding direction of the right bevel mold body is consistent with the direction of the diagonal line of the right rear side of the top surface of the top cover.

[0009] Specifically, sliders are provided at the bottom of the left mold body, left bevel mold body, rear mold body, right bevel mold body and right mold body, sliding holes for the sliders to extend into are provided on the machine cabinet surface, each slider is provided with a return spring along its own sliding direction, and a spring fixing seat for fixing the return spring is provided on the machine cabinet surface.

[0010] Specifically, three sets of outer molds are provided, namely, a left outer mold, a rear outer mold and a right outer mold. The left outer mold, the rear outer mold and the right outer mold respectively perform secondary flanging on the left side, the rear side and the right side of the first folded edge of the top cover to form a second folded edge.

[0011] Preferably, the corners of the inner mold and the corners of the outer mold have arc surfaces, wherein the arc surface of the inner mold is located on the left bevel mold body and the right bevel mold body, and the arc surface of the outer mold is distributed on the rear side of the left mold body, the left and right sides of the rear mold body, and the rear side of the right mold body.

[0012] Specifically, two hydraulic cylinders are arranged on the countertop of the machine. The hydraulic cylinders are arranged horizontally and their output ends are connected to both sides of the outer mold for returning the outer mold. When the hydraulic cylinder is in the initial position, the internal pressure is in a balanced state. When the outer mold is pushed toward the inner mold, the output end of the hydraulic cylinder is pulled to generate negative pressure in the hydraulic cylinder. When the pressure of the outer mold disappears, the negative pressure in the hydraulic cylinder will pull its output end to pull the outer mold back to its original position.

[0013] Specifically, the countertop is provided with a limit block, and the two sides of the lower mold body are provided with extension parts, and the limit block is used to block the extension parts to form a limit. The limit block is used to limit the lower mold body to avoid excessive pushing.

[0014] Specifically, the pneumatic pressing device includes a pressing cylinder fixed by a mounting frame and a pressing plate arranged at the output end of the pressing cylinder. The pressing cylinder drives the pressing plate to descend to press and fix the top cover.

[0015] Specifically, it also includes a control system, which includes an air source station and an air control valve. Each cylinder is connected to the air control valve through an air pipe, and the air control valve is connected to the air source station through a pipeline to control the air supply to each cylinder.

[0016] The flanging method, using the above-mentioned pneumatic flanging machine for processing, comprises the following steps:

[0017] S1. Place the top cover on the inner mold and position it;

[0018] S2. Control the pneumatic pressing device to descend and press the top cover tightly;

[0019] S3. Control the lifting cylinder to push the top block to extrude the inner mold so that the inner mold rests against the inner wall of the first folded edge of the top cover;

[0020] S4. Start the driving cylinders one after another to drive the lower mold bodies of the outer molds at different positions to squeeze the first folded edge so that the bottom of the first folded edge is bent to form a second folded edge located at the step notch. At the same time, the upper mold body of the outer mold is squeezed back by the outer wall of the first folded edge and causes the connecting arm to retreat. When the connecting arm retreats, the lifting block is driven to rise under the action of the guiding inclined surface of the lifting block to push the second folded edge into the shaping groove.

[0021] S5. After the driving cylinder retreats, the lower mold body retreats to its original position, the upper mold body is reset by the reset spring, the lifting cylinder descends, the inner mold returns to its original position by the return spring, the pneumatic pressing device returns, the top cover is taken out, and one processing is completed.

[0022] Compared with the prior art, the advantages of the present invention are as follows: In the present invention, when the outer mold extrude the first folded edge of the top cover, the upper mold body is squeezed and moved by the outer wall of the first flange, driving the connecting arm to slide in the lower mold body. When the connecting arm slides, the lifting block rises under the action of the guiding inclined surface between the connecting arm and the lifting block, thereby pressing the second flange into the shaping groove. Through this extrusion, the deformation of the second flange is increased, thereby offsetting its rebound deformation, ensuring that the second flange is perpendicular to the first flange after rebound deformation, thereby meeting the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0024] Figure 1 is a three-dimensional diagram of the pneumatic flanging machine in Example 2;

[0025] Figure 2 It is a three-dimensional diagram of a partial part of the table top of the machine in Example 2 (excluding the driving part);

[0026] Figure 3 It is a stereoscopic view of a partial portion of the inner mold and the outer mold in Example 2;

[0027] Figure 4 for Figure 3 Enlarged view of the middle Q;

[0028] Figure 5 It is a front view of a partial portion of the inner mold and the outer mold in Example 2;

[0029] Figure 6 An exploded view of the lifting plate and related inner and outer molds in Example 2;

[0030] Figure 7 A three-dimensional image of the finished product of the manufactured product;

[0031] In the figure: 01, top plate; 02, first folding edge; 03, second folding edge; 10, cabinet; 20, driving cylinder; 30, pneumatic pressing device; 301, pressing cylinder; 302, pressing plate; 303, mounting frame; 401, top block; 402, lifting cylinder; 50, control system; 501, air booster pump; 502, air control valve; 60, inner mold; 601, left mold body; 602, left bevel mold body; 603 , rear mold body; 604, right bevel mold body; 605, right mold body; 6051, step notch; 6052, shaping groove; 70, outer mold; 701, hydraulic cylinder; 702, lower mold body; 7021, vertical slide groove; 7022, horizontal slide groove; 703, upper mold body; 7031, connecting arm; 704, connecting seat; 705, lifting block; 7051, sliding part; 706, limit block; 707, reset spring. DETAILED DESCRIPTION

[0032] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are only illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0033] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in subsequent drawings.

[0034] Example 1

[0035] This embodiment mainly describes the top cover after the flange, which is as follows:

[0036] Top cover introduction: Figure 7 As shown, it includes a quadrilateral top plate 01 and a first folded edge 02 located at the edge of the top plate 01, wherein the left side, the rear side and the right side of the first folded edge 02 are provided with extension parts, and the extension parts are used for flanging to form a second flanging edge.

[0037] Example 2

[0038] This embodiment mainly describes the title of the pneumatic flanging machine, which is as follows:

[0039] Pneumatic flanging machine, such as Figure 1-6As shown, the cabinet 10 includes a top block 401 disposed in the middle of the cabinet 10 table, a lifting cylinder 402 disposed below the top block 401 for driving the top block 401 to rise and fall, an inner mold 60 slidably disposed on the periphery of the top block 401, an outer mold 70 slidably disposed on the periphery of the inner mold 60, a driving cylinder 20 disposed outside the outer mold 70 for driving the outer mold 70 to move toward the inner mold 60, and a pneumatic pressing device 30 disposed just above the top block 401 for pressing the top cover to be flanging. The inner mold 60 is provided with guiding inclined surfaces that cooperate with each other. When the top block 401 rises, it pushes the inner mold 60 to move outward under the action of the guiding inclined surfaces. The outer bottom of the inner mold 60 is provided with a step notch 6051 for flanging. The top of the step notch 6051 is provided with a shaping groove 6052. The bottom of the shaping groove 6052 is an inclined surface and the depth gradually increases from the outside to the inside. The outer mold 70 is slidably arranged on the machine platform. The outer mold 70 includes a connecting seat 704 and a lower mold body 702 and an upper mold body 702 stacked and arranged. 03, the lower mold body 702 is fixed on the base, the connecting seat 704 is provided with a guide column, the upper mold body 703 is slidably sleeved on the guide column and a reset spring 707 for resetting the upper mold body 703 is provided on the guide column, the lower mold body 702 is provided with a communicating horizontal slide groove 7022 and a T-shaped vertical slide groove 7021, the inner end of the lower mold body 702 is provided with a lifting block 705 with a T-shaped sliding portion 7051, and the lifting block 705 extends into the vertical slide groove 7021 through the sliding portion 7051 and connects with the lower mold body 702. The mold body 702 is slidably connected, the top surface of the lifting block 705 is provided with a shaping slope that matches the shape of the bottom of the shaping groove 6052, the bottom of the upper mold body 703 is provided with a connecting arm 7031 that extends into the sliding groove, and a guiding slope that abuts against each other is provided between the bottom of the lifting block 705 and the connecting arm 7031. When the upper mold body 703 is pressed and retreats, the connecting arm 7031 and the lifting block 705 drive the lifting block 705 to rise under the action of the guiding slope, and press the folded edge of the top cover into the shaping groove 6052. Preferably, a step hole is provided in the upper mold body 703, the guide rod extends into the step hole, and a limit nut is threadedly connected at the end of the guide rod to prevent the upper mold body 703 from falling off from the end of the guide rod. Preferably, in a natural state, the inner end surface of the upper mold body 703 is flush with the left end surface of the lifting block 705. In this solution, when the outer mold 70 extrude the first folded edge of the top cover, the upper mold body 703 is squeezed and moved by the outer wall of the first flange, driving the connecting arm 7031 to slide in the lower mold body 702. When the connecting arm 7031 slides, the lifting block 705 rises under the action of the guiding inclined surface between the connecting arm 7031 and the lifting block 705, thereby pressing the second flange into the shaping groove 6052. Through this extrusion, the deformation of the second flange is increased, thereby offsetting its rebound deformation, ensuring that the second flange is perpendicular to the first flange after rebound deformation, thereby meeting the design requirements.

[0040] Specifically, the inner mold 60 includes a left mold body 601, a left bevel mold body 602, a rear mold body 603, a right bevel mold body 604 and a right mold body 605. When the top block 401 is raised, the left mold body 601 slides to the left, the left bevel mold body 602 slides to the bevel of the left rear side, the rear mold body 603 slides backward, the right bevel mold body 604 slides to the bevel of the right rear side, and the right mold body 605 slides to the right; mutually fitting guide inclined surfaces are provided between the left mold body 601 and the left side of the top block 401, the rear mold body 603 and the rear side of the top block 401, and the right mold body 605 and the right side of the top block 401; the rear side of the left mold body 601 and the left side of the rear mold body 603 are provided with a broken line extrusion The left beveled die body 602 has a filling part that matches the extrusion notch, and the extrusion notches of the left die body 601 and the rear die body 603 squeeze the filling part of the left beveled die body 602 to drive the left beveled die body 602 to slide obliquely; the rear side of the right die body 605 and the right side of the rear die body 603 are provided with a broken line extrusion notch, and the right beveled die body 604 is provided with a filling part that matches the extrusion notch, and the extrusion notches of the right die body 605 and the rear die body 603 squeeze the filling part of the right beveled die body 604 to drive the right beveled die body 604 to slide obliquely, and when each die body is at the outer limit position, an annular structure is formed at the edge and the annular structure is against the inner wall surface of the first flange of the top cover. The sliding direction of the left beveled die body 602 is consistent with the direction of the diagonal line of the left rear side of the top surface of the top cover, and the sliding direction of the right beveled die body 604 is consistent with the direction of the diagonal line of the right rear side of the top surface of the top cover.

[0041] Specifically, sliders are provided at the bottom of the left mold body 601, the left bevel mold body 602, the rear mold body 603, the right bevel mold body 604 and the right mold body 605, and sliding holes for the sliders to extend into are provided on the table top of the cabinet 10. Each slider is provided with a return spring along its own sliding direction, and a spring fixing seat for fixing the return spring is provided on the table top of the cabinet 10.

[0042] Specifically, the outer mold 70 is provided with three sets, namely the left outer mold 70, the rear outer mold 70 and the right outer mold 70. The left outer mold 70, the rear outer mold 70 and the right outer mold 70 respectively perform secondary flanging on the left side, the rear side and the right side of the first folded edge of the top cover to form a second folded edge.

[0043] Preferably, the corners of the inner mold 60 and the corners of the outer mold 70 have arc surfaces, wherein the arc surface of the inner mold 60 is located on the left bevel mold body 602 and the right bevel mold body 604, and the arc surface of the outer mold 70 is distributed on the rear side of the left mold body 601, the left and right sides of the rear mold body 603, and the rear side of the right mold body 605.

[0044] Specifically, two hydraulic cylinders 701 are provided on the table of the cabinet 10. The hydraulic cylinders 701 are arranged horizontally and their output ends are connected to both sides of the outer mold 70 for returning the outer mold 70. When the hydraulic cylinders 701 are in the initial position, the internal pressure is in a balanced state. When the outer mold 70 is pushed toward the inner mold 60, the output ends of the hydraulic cylinders 701 are pulled to generate negative pressure in the hydraulic cylinders 701. When the pressure of the outer mold 70 disappears, the negative pressure in the hydraulic cylinders 701 will pull its output ends to pull the outer mold 70 back to its original position.

[0045] Specifically, the cabinet 10 is provided with a limit stopper 706, and the two sides of the lower mold body 702 are provided with extensions, and the limit stopper 706 is used to block the extensions to form a limit. The limit stopper 706 is used to limit the lower mold body 702 to avoid excessive pushing.

[0046] Specifically, the pneumatic pressing device 30 includes a pressing cylinder 301 fixed by a mounting frame 303 and a pressing plate 302 arranged at the output end of the pressing cylinder 301. The pressing cylinder 301 drives the pressing plate 302 to descend to press and fix the top cover.

[0047] Specifically, it also includes a control system 50, which includes an air booster pump 501 and an air control valve 502. Each cylinder is connected to the air control valve 502 through an air pipe, and the air control valve 502 is connected to the air source station through a pipeline to control the air supply to each cylinder.

[0048] Example 3

[0049] This embodiment mainly describes the title of the pneumatic flanging machine, which is as follows:

[0050] The difference between this embodiment and embodiment 2 is that: the lower mold body is provided with a connected horizontal slide groove and a vertical slide groove, a lifting block is provided in the slide groove, and a guide slope abutting against each other is provided between the bottom of the lifting block and the connecting arm, and when the upper mold body is pressed and retreats, the connecting arm slides in the horizontal slide groove and drives the lifting block to rise under the action of the guide slope to press the folded edge of the top cover into the shaping groove. In this embodiment, the horizontal slide groove is a sink type structure.

[0051] Example 4

[0052] This embodiment mainly describes the title of the flanging method, which is as follows:

[0053] The flanging method is performed using the pneumatic flanging machine described in Example 2 or Example 3, and comprises the following steps:

[0054] S1. Place the top cover on the inner mold 60 and position it;

[0055] S2. Control the pneumatic pressing device 30 to descend and press the top cover;

[0056] S3. Control the lifting cylinder 402 to rise and push the top block 401 to extrude the inner mold 60, so that the inner mold 60 rests against the inner wall of the first folded edge of the top cover 02;

[0057] S4. Start the driving cylinders 20 one after another, drive the outer molds 70 at different positions to squeeze the first folding edge 02 so that the bottom of the first folding edge 02 is bent to form the second folding edge 03 located at the step notch 6051, and at the same time, the upper mold body 703 of the outer mold 70 is squeezed by the outer wall of the first folding edge 02 so that the upper mold body 703 and the connecting arm 7031 move outward relative to the lower mold body 702. When the connecting arm 7031 moves outward relatively, the connecting arm 7031 and the guiding inclined surface of the lifting block 705 drive the lifting block 705 to rise and push the second folding edge 03 into the shaping groove 6052;

[0058] S5. After the driving cylinder 20 retreats, the lower mold body 702 retreats to its original position, the upper mold body 703 is reset under the action of the reset spring 707, the lifting cylinder 402 descends, the inner mold 60 returns to its original position under the action of the return spring, the pneumatic pressing device 30 returns, the top cover is taken out, and one processing is completed.

[0059] The titles provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the present invention and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified. These improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A pneumatic flanging machine, comprising a cabinet, a top block arranged in the middle of the cabinet cabinet countertop, a lifting cylinder arranged below the top block for driving the top block to rise and fall, an inner mold slidably arranged on the periphery of the top block, an outer mold slidably arranged on the periphery of the inner mold, a driving cylinder arranged on the outer side of the outer mold for driving the outer mold to move toward the inner mold, and a pneumatic pressing device arranged just above the top block for pressing the top cover to be flanging, the top block and the inner mold are provided with mutually matching guiding inclined surfaces, and when the top block rises, the inner mold is pushed to move to the outside under the action of the guiding inclined surfaces, and the characteristics are as follows: The outer bottom of the inner mold is provided with a step notch for flanging, and the top of the step notch is provided with a shaping groove, the bottom of the shaping groove is an inclined surface and the depth gradually increases from the outside to the inside; the outer mold is slidably arranged on the machine table, and the outer mold includes a connecting seat and a stacked lower mold body and an upper mold body, the lower mold body is fixed on the base, the connecting seat is provided with a guide column, the upper mold body is slidably sleeved on the guide column and a reset spring for resetting the upper mold body is provided on the guide column, the lower mold body is provided with a connected horizontal slide groove and a T-shaped vertical slide groove or a vertical slide groove, and the lower A lifting block with a T-shaped sliding portion is provided at the inner end of the mold body, and the lifting block extends into the vertical sliding groove through the sliding portion and is slidably connected to the lower mold body, or a lifting block is provided in the sliding groove, and the top surface of the lifting block is provided with a shaping inclined surface that matches the shape of the bottom of the shaping groove, and the bottom of the upper mold body is provided with a connecting arm that extends into the sliding groove, and guide inclined surfaces that are abutted against each other are provided between the bottom of the lifting block and the connecting arm. When the upper mold body retreats after being pressed, the connecting arm and the lifting block drive the lifting block to rise under the action of the guiding inclined surface and press the folded edge of the top cover into the shaping groove.

2. The pneumatic flanging machine according to claim 1, characterized in that: The inner mold includes a left mold body, a left bevel mold body, a rear mold body, a right bevel mold body and a right mold body. When the top block is raised, the left mold body slides to the left, the left bevel mold body slides to the bevel of the left rear side, the rear mold body slides backward, the right bevel mold body slides to the bevel of the right rear side, and the right mold body slides to the right; mutually fitting guide inclined surfaces are provided between the left mold body and the left side of the top block, the rear mold body and the rear side of the top block, and the right mold body and the right side of the top block; a folded line extrusion notch is provided on the rear side of the left mold body and the left side of the rear mold body, and the left bevel mold body is provided with a guide inclined surface that fits with the extrusion notch. A filling part cooperates with the notch, and the extrusion notches of the left mold body and the rear mold body squeeze the filling part of the left bevel mold body to drive the left bevel mold body to slide obliquely; a broken line extrusion notch is provided on the rear side of the right mold body and the right side of the rear mold body, and the right bevel mold body is provided with a filling part that cooperates with the extrusion notch, and the extrusion notches of the right mold body and the rear mold body squeeze the filling part of the right bevel mold body to drive the right bevel mold body to slide obliquely, and when each mold body is located at the outer limit position, an annular structure is formed at the edge and the annular structure rests on the inner wall surface of the first flange of the top cover.

3. The pneumatic flanging machine according to claim 2, characterized in that: The bottoms of the left mold body, the left bevel mold body, the rear mold body, the right bevel mold body and the right mold body are all provided with slide blocks, and the machine cabinet surface is provided with sliding holes for the slide blocks to extend into, and each slide block is provided with a return spring along its own sliding direction, and the machine cabinet surface is provided with a spring fixing seat for fixing the return spring.

4. The pneumatic flanging machine according to claim 2, characterized in that: There are three sets of outer molds, namely left outer mold, rear outer mold and right outer mold. The left outer mold, rear outer mold and right outer mold respectively perform secondary flanging on the left side, rear side and right side of the first folded edge of the top cover to form a second folded edge.

5. The pneumatic flanging machine according to claim 2, characterized in that: The inner mold corners and the outer mold corners have arc surfaces, wherein the arc surface of the inner mold is located on the left bevel mold body and the right bevel mold body, and the arc surface of the outer mold is distributed on the rear side of the left mold body, the left and right sides of the rear mold body, and the rear side of the right mold body.

6. The pneumatic flanging machine according to claim 1, characterized in that: Two hydraulic cylinders are arranged on the machine table, the hydraulic cylinders are arranged horizontally and the output ends thereof are connected to the two sides of the outer mold for returning the outer mold.

7. The pneumatic flanging machine according to claim 1, characterized in that: The countertop of the machine cabinet is provided with a limit stopper, and two sides of the lower mold body are provided with extension parts, and the limit stopper is used to block the extension part to form a limit.

8. The pneumatic flanging machine according to claim 1, characterized in that: The pneumatic pressing device comprises a pressing cylinder fixed by a mounting frame and a pressing plate arranged at the output end of the pressing cylinder. The pressing cylinder drives the pressing plate to descend to press and fix the top cover.

9. The pneumatic flanging machine according to claim 1, characterized in that: It also includes a control system, which includes an air source station and an air control valve. Each cylinder is connected to the air control valve through an air pipe, and the air control valve is connected to the air source station through a pipeline to control the air supply to each cylinder.

10. A flanging method, using the pneumatic flanging machine according to any one of claims 1 to 9 for processing, characterized in that: The following steps are involved: S1. Place the top cover on the inner mold and position it; S2. Control the pneumatic pressing device to descend and press the top cover tightly; S3. Control the lifting cylinder to push the top block to extrude the inner mold so that the inner mold rests against the inner wall of the first folded edge of the top cover; S4. Start the driving cylinders one by one, drive the outer molds at different positions to squeeze the first folded edge so that the bottom of the first folded edge is bent to form a second folded edge located at the step notch, and at the same time, the upper mold body of the outer mold is squeezed by the outer wall of the first folded edge so that the upper mold body and the connecting arm move outward relative to the lower mold body. When the connecting arm moves outward relatively, the connecting arm and the guiding inclined surface of the lifting block drive the lifting block to rise and push the second folded edge into the shaping groove; S5. After the driving cylinder retreats, the lower mold body retreats to its original position, the upper mold body is reset under the action of the reset spring, the lifting cylinder descends, the inner mold returns to its original position under the action of the return spring, the pneumatic pressing device returns to its position, the top cover is taken out, and one processing is completed.

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