Method for repairing and replacing a molded concave steel door cover and processing equipment thereof

Abstract

The application discloses a kind of processing equipment of the new repair method of mould pressing concave steel door cover, including upper rack, lower rack and control machine table, the upper rack includes a group of top pressure mechanism;The lower rack includes a group of bottom pressure mechanism, two groups of adjustable spacing bending guide rollers set in the lower rack frame body and two groups of extrusion mechanisms set in the two sides of the lower rack interior;Two groups of movable bending guide rollers are provided, to adapt to the production of different sizes U-shaped substrate, by controlling the spacing of two groups of bending guide rollers and the moving distance of extrusion mechanism, the U-shaped substrate of specific size and bending angle can be processed, to adapt to different specifications and sizes of mould pressing concave door panel or cover plate, fully meet the new repair needs of mould pressing concave door panel or cover plate.

Description

Technical Field

[0001] The invention relates to the field of processing and repairing concave door covers, and in particular to a method for replacing and repairing a molded concave steel door cover and processing equipment thereof. Background Art

[0002] In routine ship repairs, it is often necessary to replace or repair the ship's door panels or cover panels. Most of the ship's door panels or cover panels are one-time molded concave structures. The original production method is to use a one-time die-casting process to form a concave structure with the middle as a whole concave. However, in the replacement repair, due to the different models of door panels or cover panels produced by different manufacturers, the size, concave size and concave angle of the door panels or cover panels are different, and the corresponding processing molds are also different. At the same time, corresponding processing equipment is also required. This makes it difficult to process the required concave door cover according to the original molding process method during the replacement repair. The only way to replace or repair is to purchase original parts from outside, which seriously affects the construction progress. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects in the prior art and provide a method for replacing and repairing a molded concave steel door cover, comprising the following steps:

[0004] The first step is to measure parameter information of the door panel or cover panel to be replaced, wherein the parameter information includes the length, width, length of the concave structure, width of the concave structure, and bending angle of the concave structure of the door panel or cover panel;

[0005] The second step is to process and produce a set of U-shaped substrates based on the parameter information;

[0006] The third step is to cut the U-shaped base plate to obtain a set of U-shaped splicing plates and a set of U-shaped cutting plates;

[0007] The fourth step is to process the U-shaped splicing plate, cut the front and rear ends of the U-shaped splicing plate, and form splicing inclined surfaces at the front and rear ends of the U-shaped splicing plate;

[0008] Step 5: Cut the two sides of the U-shaped cutting board to obtain two sets of L-shaped splicing boards, and cut the middle of the U-shaped cutting board to obtain two sets of flat edge banding boards;

[0009] Step 6: respectively butt the two sets of L-shaped splicing plates with the front and rear splicing oblique surfaces of the U-shaped splicing plate, and fix the U-shaped splicing plate and the L-shaped splicing plate into shape by welding;

[0010] Step 7: Butt the two sets of flat edge panels to the left and right ends of the U-shaped splicing plate respectively, and connect the flat edge panels to the U-shaped splicing plate and the L-shaped splicing plate by welding;

[0011] The eighth step is to clean the rough-processed parts formed by welding the U-shaped splicing plates, L-shaped splicing plates and flat edge banding plates, and cut their peripheries to make them consistent with the size of the new door panels or cover panels to be replaced.

[0012] A processing device for a method of replacing and repairing a molded concave steel door cover comprises an upper frame, a lower frame and a control machine, wherein the upper frame comprises a set of top pressing mechanisms;

[0013] The lower frame includes:

[0014] A bottom pressing mechanism is arranged opposite to the top pressing mechanism;

[0015] Two sets of bending guide rollers with adjustable spacing arranged inside the lower frame;

[0016] Two groups of extrusion mechanisms are arranged on both sides of the lower frame.

[0017] A further preferred technical solution is that a movable groove is opened in the frame of the lower frame, and a sliding connection block is provided at the end of the bending guide roller, and the bending guide roller slides on the movable groove through the sliding connection block;

[0018] A limiting bolt is also provided on the sliding connection block.

[0019] A further preferred technical solution is that an indicating scale line is provided on the movable groove.

[0020] A further preferred technical solution is that the extrusion mechanism includes an extrusion plate, a push rod and an extrusion drive mechanism;

[0021] The driving mechanism drives the push rod and the extrusion plate to move inward.

[0022] Another preferred technical solution is that the extrusion drive mechanism is provided with a servo control system.

[0023] Another preferred technical solution is that the extrusion plate is an inclined plate arranged obliquely downward.

[0024] Another preferred technical solution is that a pressure sensor is provided on the extrusion plate.

[0025] Another preferred technical solution is that the top pressing mechanism and the bottom pressing mechanism both include a pressing plate, a guide rod and a hydraulic cylinder.

[0026] Another preferred technical solution is that the upper frame and the lower frame are hinged, and both the upper frame and the lower frame are provided with fixing buckles.

[0027] The advantages and beneficial effects of the present invention are:

[0028] 1. The molded concave door panel or cover panel that needs to be replaced or repaired is processed by splicing and welding a U-shaped splicing plate, two L-shaped splicing plates and two flat edge banding plates. The various plates required in the splicing process can be cut from a set of U-shaped base plates. This replacement and repair method is simple and convenient, and can quickly replace and repair the molded concave door panel or cover panel of a ship, which is conducive to controlling repair costs and shortening repair time.

[0029] 2. Design a U-shaped base plate processing equipment, which is equipped with two sets of movable bending guide rollers to adapt to the production of U-shaped base plates of different sizes. At the same time, by controlling the spacing between the two sets of bending guide rollers and the moving distance of the extrusion mechanism, U-shaped base plates of specific sizes and bending angles can be processed, thereby adapting to molded concave door panels or cover panels of different specifications and sizes, fully meeting the replacement and repair needs of molded concave door panels or cover panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the U-shaped substrate cutting process of the present invention;

[0031] Figure 2 This is a schematic diagram of the cutting process of the front and rear ends of the U-shaped splicing plate of the present invention;

[0032] Figure 3 It is a schematic diagram of the splicing and welding method of the U-shaped splicing plate, the L-shaped splicing plate and the flat edge banding plate of the present invention;

[0033] Figure 4 It is a structural diagram of the equipment for replacing and repairing the molded concave steel door cover of the present invention;

[0034] Figure 5 It is a schematic diagram of the principle of the equipment for replacing and repairing the molded concave steel door cover of the present invention;

[0035] Figure 6 It is a schematic structural diagram of the extrusion mechanism of the present invention;

[0036] Figure 7 It is a schematic structural diagram of the top pressing mechanism of the present invention.

[0037] In the figure: 1. U-shaped base plate; 101. U-shaped splicing plate; 102. L-shaped splicing plate; 103. Flat edge banding plate; 2. Upper frame; 21. Top pressing mechanism; 211. Pressing plate; 212. Guide rod; 213. Hydraulic cylinder; 3. Lower frame; 31. Extrusion mechanism; 312. Extrusion drive mechanism; 312. Push rod; 313. Extrusion plate; 32. Bending guide roller; 33. Bottom pressing mechanism; 34. Movable groove; 35. Sliding connecting block; 351. Limit bolt; 4. Control machine; 5. Fixing buckle. DETAILED DESCRIPTION

[0038] The following embodiments are further described in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0039] like Figures 1 to 3 As shown, the present invention is a method for replacing and repairing a molded concave steel door cover, comprising the following steps:

[0040] The first step is to measure the parameter information of the door panel or cover panel to be replaced, including the length, width, length of the concave structure, width of the concave structure and bending angle of the concave structure;

[0041] The second step is to process and produce a set of U-shaped substrates 1 based on the parameter information;

[0042] The third step is to cut the U-shaped base plate 1 to obtain a set of U-shaped splicing plates 101 and a set of U-shaped cutting plates;

[0043] The fourth step is to process the U-shaped splicing plate 101, cut the front and rear ends of the U-shaped splicing plate 101, and form splicing inclined surfaces at the front and rear ends of the U-shaped splicing plate 101;

[0044] Step 5: Cut the two sides of the U-shaped cutting board to obtain two sets of L-shaped splicing boards 102, and cut the middle of the U-shaped cutting board to obtain two sets of flat edge banding boards 103;

[0045] Step 6: Align the two sets of L-shaped splicing plates 102 with the front and rear splicing oblique surfaces of the U-shaped splicing plate 101, and fix the U-shaped splicing plates 101 and the L-shaped splicing plates 102 into a fixed shape by welding;

[0046] Step 7: Butt the two sets of flat edge panels 103 to the left and right ends of the U-shaped splicing plate 101, and connect the flat edge panels 103 to the U-shaped splicing plate 101 and the L-shaped splicing plate 102 by welding;

[0047] In the eighth step, the rough-machined parts formed by welding the U-shaped splicing plate 101, the L-shaped splicing plate 102 and the flat edge banding plate 103 are cleaned and their peripheries are cut to make them consistent with the size of the new door panel or cover panel to be replaced.

[0048] In order to solve the problem of difficult-to-adapt replacement and repair of concave molded door panels or cover panels, this solution uses a U-shaped splicing panel 101, two L-shaped splicing panels 102 and two flat edge banding panels 103 to splice and weld to produce the required molded door panels or cover panels. In this method, a U-shaped splicing panel 101, two L-shaped splicing panels 102 and two flat edge banding panels 103 can all be obtained by cutting from a U-shaped base panel 1. The splicing of a U-shaped splicing panel 101, two L-shaped splicing panels 102 and two flat edge banding panels 103 is carried out by simple and easy welding, thereby quickly completing the replacement and repair, and at the same time helping to control production costs.

[0049] In this method, since the L-shaped splicing board 102 and the U-shaped splicing board 101 are actually obtained from a U-shaped base plate 1, their bending angles remain consistent. Therefore, the parameters of the produced U-shaped base plate 1 and the parameters of each splicing board after cutting can control the parameters of the processed molded concave door panel or cover panel, and obtain the required molded concave door panel or cover panel, which can be specifically reflected in: the length and width of the finished door panel or cover panel are controlled by the cutting in the eighth step; the length and width of the concave structure are controlled by the cutting in the fourth step (the flat bottom surface of the U-shaped splicing board 101 after cutting is the size of the concave structure); the bending angle of the concave structure is controlled by the production in the second step.

[0050] like Figure 4-7 As shown, a processing device for a method of replacing and repairing a molded concave steel door cover includes an upper frame 2, a lower frame 3 and a control machine 4. The upper frame 2 includes a set of top pressing mechanisms 21;

[0051] Lower rack 3 includes:

[0052] A bottom pressing mechanism 33 is arranged opposite to the top pressing mechanism 21;

[0053] Two sets of bending guide rollers 32 with adjustable spacing are arranged inside the frame of the lower frame 3;

[0054] Two groups of extrusion mechanisms 31 are arranged on both sides of the lower frame 3 .

[0055] The present technical solution proposes a method for replacing and repairing a molded concave steel door cover. In this method, a U-shaped base plate 1 is cut to obtain a U-shaped splicing plate 101, two L-shaped splicing plates 102 and two flat edge banding plates 103. The U-shaped splicing plate 101, two L-shaped splicing plates 102 and two flat edge banding plates 103 are welded together to form the required molded concave door panel or cover panel. In this method, an appropriate U-shaped base plate 1 needs to be produced first.

[0056] Based on this problem, the present solution also proposes a production and processing equipment capable of producing the required U-shaped substrate 1. The equipment places a metal flat plate on a bending guide roller 32, fixes the metal flat plate through the bending guide roller 32 and the top pressing mechanism 21 and the bottom pressing mechanism 33, and then squeezes the metal flat plate through the extrusion mechanisms 31 on both sides, so that the metal flat plate is bent along the bending guide roller 32, thereby producing the required U-shaped substrate 1; in this solution, the distance between the two sets of bending guide rollers 32 can be adjusted to adapt to the processing of U-shaped substrates 1 of different widths; at the same time, since only the metal flat plate that exceeds the bending guide roller 32 will be extruded and bent, the length of the bent part of the produced U-shaped substrate 1 can be controlled; by controlling the movement distance of the extrusion mechanism 31, the bending degree (i.e., the bending angle) of the metal flat plate can be controlled. Therefore, the processing equipment proposed in this solution can produce U-shaped substrates 1 of specific size, specific bending length and specific bending angle, and then use the U-shaped substrate 1 to process concave molded door panels or cover panels of different models and specifications for replacement and repair.

[0057] Furthermore, a movable groove 34 is opened in the frame of the lower frame 3, and a sliding connection block 35 is provided at the end of the bending guide roller 32, and the bending guide roller 32 slides on the movable groove 34 through the sliding connection block 35;

[0058] A limiting bolt 351 is also provided on the sliding connection block 35 .

[0059] In this solution, both sets of bending guide rollers 32 can slide through the sliding connecting block 35, thereby changing the spacing between the two sets of bending guide rollers 32; by unscrewing the limit bolt 351, the engagement between the sliding connecting block 35 and the movable groove 34 can be released. At this time, the sliding connecting block 35 can be manually moved to adjust the distance between the two sets of bending guide rollers 32. After the distance adjustment is completed, the limit bolt 351 is screwed closed to fix the bending guide rollers 32, thereby completing the spacing adjustment of the bending guide rollers 32.

[0060] In other feasible implementation methods, the bending guide rollers 32 can also be moved through mechanical automation. Specifically, two sets of sliding connection blocks 35 are installed on the nut sleeves of the two sets of lead screws. The servo motor drives the nut sleeves to move, thereby changing the spacing between the two sets of bending guide rollers 32 to adapt to the processing of U-shaped substrates 1 of different sizes. It should be noted that in this technical solution, the distance between the two sets of bending guide rollers 32 can be changed, but the two sets of bending guide rollers 32 are always symmetrical along the centerline of the lower frame 3. Specifically, the movement of the two sets of bending guide rollers 32 is anti-symmetrical.

[0061] Furthermore, an indicating scale line is provided on the movable groove 34 .

[0062] The indicator scale lines mainly indicate the adjustment of the distance between the two sets of bending guide rollers 32 so that the processed U-shaped substrate 1 meets the processing requirements.

[0063] Furthermore, the extrusion mechanism 31 includes an extrusion plate 313 , a push rod 312 and an extrusion drive mechanism 311 ;

[0064] The driving mechanism drives the push rod 312 and the pressing plate 313 to move inward.

[0065] As attached Figure 4-6 As shown, the two groups of extrusion mechanisms 31 are also symmetrically arranged on both sides of the two groups of bending guide rollers 32. The two groups of extrusion mechanisms 31 operate simultaneously, thereby squeezing out bending portions on both sides of the metal plate, thereby forming a U-shaped substrate 1; in this solution, the extrusion drive mechanism 311 drives the push rod 312 and the extrusion plate 313 to move, thereby squeezing the metal plate so that both sides of the metal plate are bent. In a specific implementation scheme, the extrusion drive mechanism 311 can be a motor, and the push rod 312 is a corresponding electric push rod 312. The extrusion drive mechanism 311 can also be a hydraulic cylinder 213 or a pneumatic cylinder. Correspondingly, the push rod 312 is a hydraulic push rod 312 and a pneumatic push rod 312.

[0066] Furthermore, the extrusion mechanism 31 is provided with a servo control system.

[0067] The moving distance of the two sides of the metal plate driven by the extrusion mechanism 31 can reflect the bending degree (i.e. bending angle) of the metal plate. For details, please refer to Figure 5 After the metal plate is fixed on the bending guide roller 32, the portion of the metal plate that extends beyond the bending guide roller 32 (the portions on both sides of the metal plate that are not in contact with the bending guide roller 32 are the extending portions) will be squeezed and bent by the squeezing mechanism 31. The length of the portion of the metal plate that extends beyond the bending guide roller 32 is controllable and is considered known. The length of the portion of the metal plate that extends beyond the bending guide roller 32 and the angle at which it needs to be bent (obtained by measuring the original parts data) can be used to approximately determine the distance by which the portion of the metal plate that extends beyond the bending guide roller 32 needs to be squeezed and bent.

[0068] The servo control system can accurately control the distance that the extrusion mechanism 31 extrudes the metal flat plate, thereby producing the desired U-shaped substrate 1 .

[0069] Furthermore, the extrusion plate 313 is an inclined plate arranged obliquely downward.

[0070] The extrusion plate 313 is a downwardly arranged inclined plate that can bend the metal flat plate downward. In other embodiments, when the metal flat plate needs to be bent upward, the extrusion plate 313 needs to be tilted upward. The extrusion plate 313 can be an inclined flat plate or a curved plate with a certain curvature and tilted downward.

[0071] Furthermore, a pressure sensor is provided on the extrusion plate 313 .

[0072] The pressure sensor (not shown in the figure) on the extrusion plate 313 can sense the force between the extrusion plate 313 and the metal plate. Therefore, on the one hand, it can accurately determine whether the extrusion plate 313 is in contact with the metal plate. On the other hand, it can monitor whether the force between the extrusion plate 313 and the metal plate is too large, thereby providing a timely warning to avoid the occurrence of safety accidents.

[0073] Furthermore, the top pressing mechanism 21 and the bottom pressing mechanism 33 both include a pressing plate 211 , a guide rod 212 and a hydraulic cylinder 213 .

[0074] like Figure 7 As shown, the top pressing mechanism 21 and the bottom pressing mechanism 33 have the same components, and both use the hydraulic cylinder 213 to drive the pressing plate 211 to press and fix the metal plate. In order to prevent the pressing plate 211 from exerting excessive force on the metal plate, a deceleration buffer device can also be installed on the hydraulic cylinder 213. In this solution, the top pressing mechanism 21 and the bottom pressing mechanism 33 are both set between two sets of bending guide rollers 32. During the processing, on the one hand, they clamp and fix the metal plate, and on the other hand, they limit the middle of the metal plate to prevent the metal plate from bending when it is squeezed by the squeezing mechanism 31. In actual processing, the top pressing mechanism 21 and the bottom pressing mechanism 33 clamp the metal plate from the top and bottom respectively. When the width of the processed metal plate is small, the distance between the two sets of bending guide rollers 32 is very short, and the bottom pressing mechanism 33 does not need to be activated.

[0075] Furthermore, the upper frame 2 and the lower frame 3 are hinged, and fixing buckles 5 are provided on both the upper frame 2 and the lower frame 3 .

[0076] The upper frame 2 is hinged to the lower frame 3, and the upper frame 2 can be opened so that the metal plate can be placed on the bending guide roller 32 between the upper frame 2 and the lower frame 3 for processing. The fixing buckle 5 is used to connect and fix the upper frame 2 and the lower frame 3. After the upper frame 2 is covered, the connecting screw is inserted into the fixing buckle 5 of the two to keep the upper frame 2 and the lower frame 3 fixed and locked during the processing.

[0077] Working principle: In this solution, the U-shaped base plate 1 is cut and welded to produce the required molded concave door panel or cover panel. The specific steps are as follows:

[0078] The first step is to determine the parameter information of the door panel or cover panel to be replaced. This step requires measuring the door panel or cover panel to be replaced and repaired. Based on the measured data, it serves as a reference for subsequent replacement and repair, so that the processed door panel or cover panel is as consistent as possible with the door panel or cover panel to be replaced.

[0079] The second step is to process and produce a set of U-shaped base plates 1 based on the parameter information. In this step, the side bending angle of the produced U-shaped base plates 1 needs to be controlled to be consistent with the bending angle of the concave surface of the new molded concave door panel or cover panel to be replaced. The length or width of the concave surface of the U-shaped base plates 1 and the new molded concave door panel or cover panel to be replaced must be consistent.

[0080] The third step is to cut the U-shaped base plate 1 to obtain a set of U-shaped splicing plates 101 and a set of U-shaped cutting plates. In this step, the size of the U-shaped splicing plates 101 is larger than the concave size of the molded concave door panel or cover panel to be replaced, and the length of the U-shaped cutting plates is larger than the width of the U-shaped base plate 1;

[0081] The fourth step is to process the U-shaped splicing plate 101, cut the front and rear ends of the U-shaped splicing plate 101, and form splicing inclined surfaces at the front and rear ends of the U-shaped splicing plate 101. After this step, it is necessary to control the bottom size of the U-shaped splicing plate 101 after cutting to be consistent with the concave size of the molded concave door panel or cover panel that needs to be replaced. After cutting, the front and rear ends of the U-shaped splicing plate 101 are splicing inclined surfaces, and the inclination angle of the splicing inclined surfaces is consistent with the bending angle of both sides of the U-shaped splicing plate 101;

[0082] Step 5: Cut the two sides of the U-shaped cutting board to obtain two sets of L-shaped splicing boards 102, and cut the middle of the U-shaped cutting board to obtain two sets of flat edge banding boards 103;

[0083] The sixth step is to butt the two sets of L-shaped splicing plates 102 with the front and rear splicing inclined surfaces of the U-shaped splicing plate 101 respectively, and fix the U-shaped splicing plates 101 and the L-shaped splicing plates 102 into shape by welding. In this step, since the inclination angle of the splicing inclined surfaces is consistent with the bending angles on both sides of the U-shaped splicing plate 101, the L-shaped splicing plates 102 and the U-shaped splicing plates 101 are cut from the same set of U-shaped base plates 1, and the angles of the bending parts of the two are the same, the front and rear splicing inclined surfaces of the U-shaped splicing plate 101 can just butt with the L-shaped splicing plates 102;

[0084] Step 7: Butt the two sets of flat edge panels 103 to the left and right ends of the U-shaped splicing plate 101, and connect the flat edge panels 103 to the U-shaped splicing plate 101 and the L-shaped splicing plate 102 by welding;

[0085] In the eighth step, the rough-machined parts formed by welding the U-shaped splicing plate 101, the L-shaped splicing plate 102 and the flat edge banding plate 103 are cleaned and their peripheries are cut to make them consistent with the size of the new door panel or cover panel to be replaced.

[0086] The U-shaped base plate 1 required in the above method is processed by a processing device for a method for replacing and repairing a molded concave steel door cover, and the specific steps are as follows:

[0087] First, loosen the connection between the fixing buckle 5 of the upper frame 2 and the lower frame 3, and rotate the upper frame 2 to open it;

[0088] Secondly, according to the parameters of the U-shaped substrate 1 to be processed, the distance between the two sets of bending guide rollers 32 is adjusted, and a metal plate of appropriate size is selected and laid flat on the two sets of bending guide rollers 32;

[0089] Again, the two sets of squeezing mechanisms 31 are opened, and the squeezing plates 313 of the squeezing mechanisms 31 move inward until the squeezing plates 313 of the two sets of squeezing mechanisms 31 all sense and contact the metal flat plate, and then the squeezing mechanisms 31 are closed;

[0090] Continuing from the previous step, close the upper frame 2, fix the upper frame 2 and the lower frame 3 with the fixing buckle 5, and start the top pressing mechanism 21 and the bottom pressing mechanism 33 to press and clamp the metal plate;

[0091] Next, the extrusion mechanism 31 is activated again, and the extrusion mechanism 31 moves inward by a set distance, thereby bending both sides of the metal plate to a specific angle;

[0092] Finally, the top pressing mechanism 21, the bottom pressing mechanism 33 and the extrusion mechanism 31 are all retreated, the connection between the fixing buckle 5 between the upper frame 2 and the lower frame 3 is loosened, the upper frame 2 is opened, and the processed U-shaped base plate 1 is taken out.

[0093] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for repairing a molded concave steel door cover, characterized in that: The following steps are involved: The first step is to measure parameter information of the door panel or cover panel to be replaced, wherein the parameter information includes the length, width, length of the concave structure, width of the concave structure, and bending angle of the concave structure of the door panel or cover panel; The second step is to process and produce a set of U-shaped substrates based on the parameter information; The third step is to cut the U-shaped base plate to obtain a set of U-shaped splicing plates and a set of U-shaped cutting plates; The fourth step is to process the U-shaped splicing plate, cut the front and rear ends of the U-shaped splicing plate, and form splicing inclined surfaces at the front and rear ends of the U-shaped splicing plate; Step 5: Cut the two sides of the U-shaped cutting board to obtain two sets of L-shaped splicing boards, and cut the middle of the U-shaped cutting board to obtain two sets of flat edge banding boards; Step 6: respectively butt the two sets of L-shaped splicing plates with the front and rear splicing oblique surfaces of the U-shaped splicing plate, and fix the U-shaped splicing plate and the L-shaped splicing plate into shape by welding; Step 7: Butt the two sets of flat edge panels to the left and right ends of the U-shaped splicing plate respectively, and connect the flat edge panels to the U-shaped splicing plate and the L-shaped splicing plate by welding; The eighth step is to clean the rough-processed parts formed by welding the U-shaped splicing plates, L-shaped splicing plates and flat edge banding plates, and cut their peripheries to make them consistent with the size of the new door panels or cover panels to be replaced.

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