A manufacturing method of a cylindrical hot plate

Abstract

The present invention belongs to the technical field of hot plate manufacturing, and discloses a manufacturing method of a cylindrical hot plate, which includes the following steps: Step 1, overlapping and welding a first rectangular plate and a second rectangular plate with different thicknesses to form a hot plate sheet with a turbulent flow channel; Step 2, opening a pressure charging port on the second rectangular plate, and rolling the hot plate sheet with the pressure charging port into a cylindrical plate, with the second rectangular plate serving as the outer surface of the cylindrical plate; Step 3, charging pressure into the turbulent flow channel through the pressure charging port to make the turbulent flow channel bulge outwards until reaching a preset height; Step 4, cutting off the pressure charging port, and arranging an inlet and an outlet communicated with the turbulent flow channel on the cylindrical plate to obtain the cylindrical hot plate. The present invention adopts inner and outer plates with unequal thicknesses to avoid uneven deformation of conventional plates with equal thickness; through the arrangement rule of welding points, the roundness of the deformed cylindrical hot plate is ensured; a support member is arranged to improve the uniformity; and through the pressure charging and bulging of the complete plate sheet, the roundness of the cylindrical structure is ensured to the greatest extent, and a cylindrical hot plate with uniform expansion is obtained.

Description

Technical Field

[0001] The present invention discloses a manufacturing method of a cylindrical hot plate, belonging to the technical field of hot plate manufacturing. Background Art

[0002] As a component with a unique three-dimensional wavy heat exchange surface, the manufacturing process of a hot plate involves stacking two metal plates, arranging welding wires at the edges and setting welding points in the middle. The outer circles of these welding wires and welding points are seam-welded by laser welding technology to form an integral structure. Subsequently, a pressurized fluid (such as water or nitrogen) is used to pressurize the integral structure, causing plastic deformation of the plate sheets, and finally forming the required fluid channels inside the two metal plates.

[0003] In the conventional forming method of a hot plate, first, laser welding of two thin metal plates is completed at the welding wires and welding points, then the plate sheet parts at the inlets and outlets are cut off, and inlet and outlet nozzles are welded on. After that, pressurized water or nitrogen is introduced through the nozzles to achieve pressure bulging deformation of the plate sheets. According to different process requirements, the hot plate can be designed into a straight plate type, a semi-circular type or a cylindrical type, and the fluid channels can also be divided into a direct flow type, a cross flow type and a staggered flow type.

[0004] However, in the actual processing process, the final forming effect of the hot plate is affected by various factors, including the hot plate shape, the flow channel distribution, the welding point distribution, the welding wire setting and the treatment of the inlet and outlet nozzles. Especially for a cylindrical hot plate with a diameter DN≤800mm and a height H≥1m, the conventional forming method will cause serious deformation of the whole cylindrical hot plate after being pressurized, obvious uneven local bulging, and multiple welding points at the intersection of the welding wire positions will remain unchanged in rows, thus blocking the fluid channels. Summary of the Invention

[0005] The purpose of the present invention is to provide a pressure forming method for a cylindrical hot plate to solve the technical problem that in the prior art, the conventional forming method will cause serious deformation of the whole cylindrical hot plate after being pressurized, obvious uneven local bulging, and multiple welding points at the intersection of the welding wire positions will remain unchanged in rows, thus blocking the fluid channels. To achieve the above purpose, the present invention proposes a manufacturing method of a cylindrical hot plate, and the specific scheme is as follows:

[0006] A manufacturing method of a cylindrical hot plate includes the following steps:

[0007] Step 1: Overlap and weld a first rectangular plate and a second rectangular plate with different thicknesses to form a hot plate sheet with a turbulent flow channel;

[0008] Step 2: Open a pressure charging port on the second rectangular plate, and roll the hot plate sheet with the pressure charging port into a cylindrical plate, and the second rectangular plate serves as the outer surface of the cylindrical plate;

[0009] Step 3: Pressurize the turbulent flow channel through the pressure charging port to cause the turbulent flow channel to bulge outwards until it reaches a preset height;

[0010] Step 4: Cut off the pressure charging port, and set an inlet and an outlet communicating with the turbulent flow channel on the cylindrical plate to obtain a cylindrical hot plate.

[0011] Preferably, step 1 specifically includes:

[0012] Overlap the first rectangular plate and the second rectangular plate, and weld the four peripheral edges and the middle part of the two rectangular plates to form a plurality of isolation weld lines, and the plurality of isolation weld lines form a serpentine turbulent flow channel;

[0013] And set welding points in the turbulent flow channel according to a preset rule.

[0014] Preferably, the preset rule is a plurality of rows of horizontal welding point lines and a plurality of rows of vertical welding point lines, and the welding points between the horizontal and vertical welding point lines are arranged staggeredly.

[0015] Preferably, the distance between adjacent welding points in the horizontal welding point line is greater than the distance between adjacent welding points in the vertical welding point line.

[0016] Preferably, the weld lines at the four peripheral edges of the two rectangular plates are double weld lines;

[0017] The isolation weld lines are single weld lines and / or double weld lines.

[0018] Preferably, pressurizing the turbulent flow channel through the pressure charging port to cause the turbulent flow channel to bulge outwards until it reaches a preset height specifically includes:

[0019] Pressurize the pressure charging port multiple times in a gradient boosting manner, and measure the bulging height of the cylindrical plate after each pressurization;

[0020] And adjust the pressure of the gradient boosting according to the measurement result until the hot plate sheet of the cylindrical plate reaches the preset height.

[0021] Preferably, adjusting the pressure of the gradient boosting according to the measurement result specifically includes:

[0022] Determine the pressure difference according to the difference between the measurement result and the preset height;

[0023] Determine the current pressurization pressure according to the pressure difference and the previous pressurization pressure.

[0024] Preferably, before step 4, it further includes:

[0025] After reaching the preset height, stop pressurizing and perform pressure maintaining and forming for a preset period.

[0026] Preferably, the thickness of the first rectangular plate is greater than that of the second rectangular plate;

[0027] The turbulent flow channels include multiple ones.

[0028] Preferably, before step 3, the following steps are further included:

[0029] A support member is arranged inside the cylindrical plate;

[0030] The support member is of an annular structure and is arranged on the inner surface of the cylindrical plate for preventing the cylindrical plate from excessive deformation.

[0031] Advantageous effects:

[0032] 1. The present invention adopts inner and outer plates (the first rectangular plate and the second rectangular plate) with unequal thicknesses, fully considering the effect that the inner plate (the first rectangular plate) of the cylinder tends to become round under pressure and the outer plate (the second rectangular plate) tends to become flat under pressure, avoiding the problems of different degrees of deformation and uneven overall deformation caused by using inner and outer plates with equal thicknesses in conventional hot plate forming, and improving the stability and uniformity of the cylindrical plate during the deformation process.

[0033] 2. Based on the comprehensive analysis of practice and simulation research, the present application clearly stipulates the layout principle of solder joints: that is, along the axial direction of the cylinder, the transverse solder joint pitch should be greater than or equal to the longitudinal solder joint pitch. This layout strategy aims to avoid the edge effect that may be caused when the welding wires are arranged in a staggered manner in the vertical (or horizontal) direction, which will lead to excessive constraints in local areas and then limit the bulging deformation of the surrounding plates. By following this principle, it is ensured that the cylindrical plate can maintain good roundness after deformation.

[0034] 3. The present invention accurately fixes the outer ring of the support member at the double-welded wire position of the cylindrical plate and designs the layout of the support member to avoid direct contact with the area that needs to be deformed on the cylindrical plate. This measure ensures that the cylindrical plate can obtain balanced and reasonable support in the axial position, effectively avoiding the generation of local external force constraints, and then can efficiently guide and constrain the overall deformation trend of the cylindrical plate. This design greatly improves the uniformity of the deformation of the cylindrical plate and lays a solid foundation for the stability and performance of the product.

[0035] 4. The conventional hot plate forming method is to cut off the plate at the nozzle before rolling the cylinder, manually expand the pipe, weld the required inlet and outlet nozzles, and then pressurize and bulge between the double plates from the nozzle. Local deformation is likely to occur in this process, resulting in uneven bulging due to the unevenness of the entire structure. The present invention welds through a pressurization port on the outer plate at the inlet position of the flow channel, expands the pipe along the vicinity of the pressurization port through mechanical tools, and then welds a nozzle perpendicular to the plate as a pressurization pipe. After pressure forming, the plate at the nozzle is cut off and the inlet and outlet nozzles are welded, ensuring the roundness of the cylindrical structure before deformation to the greatest extent to obtain a uniformly expanded cylindrical hot plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the overall layout of the heat plate in an embodiment of the present invention;

[0037] Figure 2 A schematic diagram of the pitch of solder joints in an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the front view of the outer panel in an embodiment of the present invention;

[0039] Figure 4 It is a schematic diagram of the structure of the cylindrical plate in an embodiment of the present invention;

[0040] Figure 5 It is a cross-sectional schematic diagram of a cylindrical plate end support member in an embodiment of the present invention;

[0041] Figure 6 It is a schematic cross-sectional view of the intermediate support member of the cylindrical plate in an embodiment of the present invention;

[0042] Figure 7 It is a curve diagram of the expansion pressure change in the embodiment of the present invention;

[0043] Figure 8 It is a schematic diagram of the cylindrical hot plate and its flow channel inlet and outlet structure in an embodiment of the present invention;

[0044] Figure 9 It is a cross-sectional schematic diagram of the hot plate bulging forming in an embodiment of the present invention.

[0045] In the figure: 1. welding point; 2. double welding line at the edge; 3. single welding line for baffle; 4. double welding line for baffle; 5. welding point unit; 6. double welding line in the middle; 7. inlet position of flow channel I; 8. outlet position of flow channel I; 9. inlet position of flow channel II; 10. outlet position of flow channel II; 11. charging port of flow channel I; 12. charging port of flow channel II; 13. splicing welding line; 14. first end support; 15. middle support; 16. second end support; 17. inlet pipe of flow channel I; 18. outlet pipe of flow channel I; 19. inlet pipe of flow channel II; 20. outlet pipe of flow channel II. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with specific implementation methods. It should be understood that the specific implementation methods described here are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0047] The present invention takes a double-channel cylindrical hot plate with a diameter of 450 mm and a height of 1500 mm as an example, and combines Figures 1-9 The pressure forming method is described in detail, and the specific steps are as follows:

[0048] Step 1: Overlap and weld a first rectangular plate and a second rectangular plate with different thicknesses to form a hot plate sheet with a turbulent flow channel.

[0049] Specifically, select two rectangular metal plates with different thicknesses for overlapping welding. The two rectangular metal plates are respectively denoted as the first rectangular plate and the second rectangular plate, where the thickness of the first rectangular plate is greater than that of the second rectangular plate. And the first rectangular plate will serve as the inner plate of the cylindrical hot plate, and the second rectangular plate will serve as the outer plate of the cylindrical hot plate.

[0050] In this embodiment, the dimensions of the first rectangular plate are: length 1414 mm (matching the circumference of the cylindrical hot plate), width (cylinder height) 1500 mm, and thickness 1.5 mm; the dimensions of the second rectangular plate are: length 1414 mm, width (cylinder height) 1500 mm, and thickness 1.2 mm. Both metal plates are made of S30408 material.

[0051] Conventional hot plate forming uses inner and outer plates with equal thickness. Since the inner plate (the first rectangular plate) in the cylindrical plate bears external pressure and the outer plate (the second rectangular plate) bears internal pressure, under the same bulging pressure, the inner and outer plates of the cylinder with the same thickness will have different degrees of deformation, resulting in uneven overall deformation of the cylindrical plate after pressurization. The present invention uses inner and outer plates with unequal thickness, and the inner plate is 0.2 - 0.5 mm thicker than the outer plate. Based on the effect that the inner pressure of the cylinder tends to be round and the outer pressure tends to be flat, inner and outer plates with different thicknesses are selected to improve the stability and uniformity of the deformation process of the cylindrical plate.

[0052] In the embodiment of the present invention, the first rectangular plate and the second rectangular plate are overlapped, and the four peripheral edges and the middle part of the two rectangular plates are welded to form a plurality of isolation weld lines, and the plurality of isolation weld lines form a serpentine turbulent flow channel; and solder joints 1 are arranged in the turbulent flow channel according to a preset rule.

[0053] Specifically, as Figure 1 shown, in this embodiment, after the first rectangular plate and the second rectangular plate are stacked, the four peripheral edges and the middle area are welded. Double weld lines are arranged around the plate to enhance the edge strength, and the double weld lines are denoted as edge double weld lines 2. In this embodiment, the outer side of the edge double weld lines 2 is 7.5 mm away from the edge of the metal plate, and the width between the double weld lines is 5 mm. At the same time, a first isolation weld line parallel to the cylinder axis, that is, the middle double weld line 6, is welded in the middle of the plate to form two independent flow channels I and II. It should be understood that in other embodiments, N first isolation weld lines parallel to the cylindrical axis can be set to form N + 1 flow channels.

[0054] In the middle of the plate, there are also multiple second isolation weld lines, i.e., baffle weld lines, perpendicular to the first isolation weld line. The second isolation weld lines are used to divide the flow channels into a serpentine shape. The first isolation weld line and the second isolation weld line are single weld lines and / or double weld lines. In this embodiment, there are three second isolation weld lines for each flow channel, dividing the flow channel into a four-pass serpentine flow channel. The width W of each flow channel is approximately 203 mm. The three second isolation weld lines are arranged in parallel along the extending direction of the cylinder axis, and there is a preset staggered length D at the ends of adjacent second isolation weld lines, and the length D of D ≥ 1 / 3W. One end of the first and the third second isolation weld lines is perpendicularly connected to the side of the metal plate, and the other end is at a preset distance A from the first isolation weld line. The percentage of the length of A relative to the flow channel width W is within ±10%, that is, the absolute length of A satisfies 0.9W ≤ A ≤ 1.1W, ensuring that the flow area of the entire flow channel is equivalent. It is designed as a single weld line and is denoted as the baffle single weld line 3; one end of the second second isolation weld line is perpendicularly connected to the first isolation weld line, and the other end is at a preset distance B from the side of the metal plate. The percentage of the length of B relative to the flow channel width W is within ±10%, that is, the absolute length of B satisfies 0.9W ≤ B ≤ 1.1W, ensuring that the flow area of the entire flow channel is equivalent. It is designed as a double weld line and is denoted as the baffle double weld line 4. Specifically, in this embodiment, as Figure 1 shown, the preset staggered length D = 258 mm, the preset distance A from the end of the baffle single weld line 3 to the first isolation weld line is 209 mm, the preset distance B from the end of the baffle double weld line 4 to the side of the metal plate is 225 mm, and the weld line width of the baffle double weld line 4 is 40.7 mm, which is used to place the support member. It should be noted that the number of the second isolation weld lines can be determined by those skilled in the art according to actual process requirements.

[0055] In the embodiment of the present invention, the preset rule is multiple rows of horizontal solder joint lines and multiple rows of vertical solder joint lines, and the solder joints 1 between the horizontal and vertical solder joint lines are staggered. The distance between adjacent solder joints 1 within the horizontal solder joint line is greater than the distance between adjacent solder joints 1 within the vertical solder joint line.

[0056] Inside the flow channel, the solder joints 1 are arranged according to the preset rule, and these solder joints 1 are distributed in a specific manner, finally forming a network of crisscross solder joint lines. In this embodiment, the solder joint lines are specifically composed of multiple rows of horizontal solder joint lines and multiple rows of vertical solder joint lines, and the solder joints 1 are arranged on these solder joint lines. It should be noted that the horizontal solder joint line refers to the solder joint line arranged along the cylinder axis direction (axial direction), while the vertical solder joint line is arranged along the circumferential direction of the cylinder. As Figure 2 shown, in order to quantify the distribution of the solder joints 1, the horizontal solder joint pitch (S T ) is defined to represent the distance between adjacent solder joints 1 within the horizontal solder joint line. Similarly, the vertical solder joint pitch (2S L ) is used to represent the distance between adjacent solder joints 1 within the vertical solder joint line, and it is required that S T is greater than or equal to 2SL In this specific embodiment, the transverse solder joint pitch S T is specifically set to 81.4 mm, and the longitudinal solder joint pitch 2S L is 47 mm. Each solder joint 1 and the solder joints 1 around it form a solder joint unit 5.

[0057] Based on the comprehensive analysis of practice and simulation research, this application clearly stipulates the layout principle of the solder joints 1: that is, the transverse solder joint pitch should be greater than or equal to the longitudinal solder joint pitch. This layout strategy aims to avoid the edge effect that may be caused when the bonding wires are arranged staggered in the vertical (or horizontal) direction. This effect will cause excessive constraints in local areas, thereby restricting the bulging deformation of the surrounding plates. By following this principle, it is ensured that the cylindrical plate can maintain good roundness after deformation.

[0058] Step 2: Open a pressure charging port on the second rectangular plate, and roll the hot plate with the pressure charging port into a cylindrical plate, with the second rectangular plate serving as the outer surface of the cylindrical plate;

[0059] Specifically, on the hot plate, a specific area is clearly selected as the inlet and outlet of the turbulent flow channel. In this embodiment, the inlet position 7 of the flow channel I, the outlet position 8 of the flow channel I, the inlet position 9 of the flow channel II, and the outlet position 10 of the flow channel II are all specifically set at the positions as shown in Figure 1 the figure.

[0060] Next, on the second rectangular plate, two pressure charging ports are opened, and the positions of these two pressure charging ports are respectively located at the inlets of the flow channel I and the flow channel II (to facilitate cutting off the pressure charging ports when setting the inlets and outlets later). In this embodiment, as shown in Figure 3 the figure, two circular holes are opened on the second rectangular plate, and the pipe is expanded along the vicinity of the circular holes using instrument tools, and then the connecting pipe is vertically welded to the metal plate to form the pressure charging port 11 of the flow channel I and the pressure charging port 12 of the flow channel II.

[0061] Finally, the hot plate is curled into a cylindrical shape, with the first rectangular plate located inside the cylinder and the second rectangular plate located outside the cylinder. After curling, precise welding operations are performed on the joints of the cylindrical structure to form the splicing welding wire 13 to ensure the stability and tightness of the entire cylindrical structure.

[0062] In the embodiment of the present invention, a support member is provided inside the cylindrical plate; the support member is of an annular structure and is arranged on the inner surface of the cylindrical plate to prevent the cylindrical plate from deforming excessively.

[0063] Specifically, as shown in Figure 4 , Figure 5 and Figure 6As shown in the figure, during the curling process, a first end support member 14 and a second end support member 16 are respectively arranged at the double-weld line positions at both ends of the cylindrical structure, and an intermediate support member 15 is arranged at the middle part of the cylindrical structure, that is, at the position of the baffle double-weld line 4. These support members are designed with an annular structure, and their outer edges are closely attached to the inner surface of the cylindrical plate and fixed at the contact points by spot welding. It should be particularly noted that, as Figure 6 shown, in order to avoid the adverse effect of the support member on the bulging deformation of the cylindrical plate, for the intermediate support member 15 at the baffle double-weld line 4, it is necessary to adjust according to the distribution of the solder joints 1, that is, at the contact position between the intermediate support member 15 and the baffle double-weld line 4, spot welding is performed with the inner wall, while in the area where the snake-shaped flow channel part distributes solder joints and there is no baffle double-weld line 4, the edge of the intermediate support member 15 needs to be cut and not contact the plate to prevent restraint on the bulging forming process.

[0064] It should be clear that in this embodiment, the distance between the support members is set to be approximately 500 mm. However, in other possible implementation cases, the distribution of the support members may be adjusted according to the specific number of the second isolation weld lines.

[0065] In the present invention, by accurately fixing the outer ring of the support member at the double-weld line position of the cylindrical plate and designing the layout of the support member to avoid direct contact with the area that needs to be deformed on the cylindrical plate, this measure ensures that the cylindrical plate can obtain balanced and reasonable support in the axial position, effectively avoids the generation of local external force constraints, and then can efficiently guide and constrain the overall deformation trend of the cylindrical plate. This design greatly improves the uniformity of the deformation of the cylindrical plate and lays a solid foundation for the stability and performance of the product.

[0066] Step 3: Pressurize the turbulent flow channel through the pressure charging port to make the turbulent flow channel bulge outward until it reaches a preset height;

[0067] Specifically, pressurize between the inner and outer plates through the pressure charging port, and increase the bulging pressure in a gradient boosting manner to make the first rectangular plate and the second rectangular plate bulge inward and outward until they reach a preset height, forming the turbulent flow channel.

[0068] Furthermore, pressurize the pressure charging port multiple times in a gradient boosting manner, measure the bulging height of the cylindrical plate after each pressurization; and adjust the pressure of the gradient boosting according to the measurement results until the hot plate of the cylindrical plate reaches a preset height.

[0069] Pressurize the pressure charging port multiple times in a gradient boosting manner, measure the bulging height of the cylindrical plate after each pressurization; and determine the bulging stage according to the measurement results, and use different pressure gradients in different stages to determine the next bulging pressure until the deformation of the hot plate of the cylindrical plate reaches a preset height.

[0070] Furthermore, adjusting the pressure of the gradient boost according to the measurement result specifically includes: determining the pressure difference according to the difference between the measurement result and the preset height; and determining the current charging pressure according to the pressure difference and the previous charging pressure.

[0071] Specific as Figure 7 As shown in the figure, the inflation process is divided into four stages according to the difference between the actual inflation height h and the target inflation height h0: the first stage h≤h0-2mm, during which the current inflation pressure P n+1 Compared with the previous inflation pressure P n The difference is the pressure difference ΔP = P n+1 -P n =1.0MPa; the second stage h0-2mm<h≤h0-1mm, ΔP=0.5MPa; the third stage h0-1mm<h≤h0-0.5mm, ΔP=0.2MPa; the fourth stage h=h0±0.5mm, the bulging height meets the manufacturing requirements, and the pressure is maintained for 15min to ensure that all parts of the plate are fully deformed; the fifth stage, the pressure in the plate is released to complete the pressure forming process. It should be understood that the stage division and pressure difference of the bulging process can be adjusted and determined by technicians in this field according to the actual process.

[0072] The use of gradient pressure increase can improve the inflation accuracy, avoid the risk of material overload or rupture, and optimize the performance of the turbulent flow channel to further ensure the inner surface smoothness and cross-sectional uniformity of the channel during the inflation process. In addition, it also reduces the process debugging cost.

[0073] Specifically, in this embodiment, pressurized fluid is slowly injected between the inner and outer plates through the flow channel I charging port 11 and the flow channel II charging port 12 to cause them to bulge and deform inward and outward until a preset height is reached, thereby forming turbulent flow channels of flow channel I and flow channel II.

[0074] In the present embodiment, a strategy of gradually increasing the inflation pressure is adopted (for example, starting from 1.0MPa, and gradually increasing to 2.0MPa, 3.0MPa, 4.0MPa, etc.), so that the cylindrical plate can be gradually and evenly inflated to a preset height range (for example, 8±0.5mm). It is worth noting that in the process of gradually pressurizing to 4.0MPa, the cylindrical plate inflated to 6.5mm. At this time, the inflation pressure was specially adjusted to 4.5 MPa, so that the cylindrical plate further inflated to 7.2mm. Subsequently, the inflation pressure was continued to be fine-tuned to 4.7MPa and 4.9MPa until the cylindrical plate inflated to 7.9mm, a height that met the preset standard. At this time, the pressurization was stopped immediately, and the pressure-maintaining molding operation was performed (for example, pressure-maintaining for 15 minutes) to ensure that the hot plate can fully creep to release residual stress, stabilize deformation, and avoid deformation height deviation caused by elastic rebound after pressure relief, so as to achieve the expected molding effect. The cross-section after molding is as follows Figure 9 shown.

[0075] Step 4: cut off the charging port, and set an inlet and outlet pipe connected with the turbulent flow channel on the cylindrical plate to obtain a cylindrical hot plate with a complete flow channel.

[0076] Specifically, Figure 8 As shown, in this embodiment, the support member in the cylinder is removed. The charging port is cut off. The cut part is trimmed and the inlet and outlet pipes are welded intact to form a complete cylindrical hot plate. Figure 8 As shown, the pipes include a flow channel I inlet pipe 17 , a flow channel I outlet pipe 18 , a flow channel II inlet pipe 19 and a flow channel II outlet pipe 20 .

[0077] The traditional hot plate forming process usually involves pre-cutting the plate at the pipe joint position before rolling the cylinder, followed by manual pipe expansion and welding of the required inlet and outlet pipes. After that, the pressure medium is filled into the double-layer plate structure from the inlet pipe to achieve expansion. However, during this process, due to the close fit between the two plates, manual pipe expansion often easily causes local deformation, resulting in unevenness of the overall structure, which in turn affects the uniformity of expansion.

[0078] Compared with the traditional method, the present invention adopts an innovative process at the flow channel inlet: first, a charging port is penetrated and welded on the outer plate, and then a pipe expansion operation is performed along the periphery of the charging port using professional equipment, and then a pipe is welded vertically to the plate as a charging pipe. After the pressure forming process is completed, the plate at the charging port position is cut off and the reserved inlet and outlet pipes are welded on. In this process, the charging port is located at the preset flow channel inlet and outlet position, and it is subsequently cut off and the pipe is reinstalled as the inlet and outlet. This improved process maximizes the roundness of the cylindrical structure before deformation, thereby obtaining a cylindrical hot plate with more uniform expansion.

[0079] As described above, these are only several embodiments of the present invention and do not impose any form of limitation on the present invention. Although the present invention is disclosed above in preferred embodiments, it is not intended to limit the present invention. Any person skilled in the relevant art can make some changes or modifications within the scope of the technical solution of the present invention by using the disclosed technical content, and these are all equivalent to equivalent embodiments and fall within the scope of the technical solution.

Claims

1. A manufacturing method of a cylindrical hot plate, characterized in that, The following steps are involved: Step 1: Overlap and weld a first rectangular plate and a second rectangular plate of different thicknesses to form a hot plate with a turbulent flow channel; The thickness of the first rectangular plate is greater than that of the second rectangular plate, and the first rectangular plate will serve as the inner plate of the cylindrical hot plate, and the second rectangular plate will serve as the outer plate of the cylindrical hot plate; Overlapping the first rectangular plate and the second rectangular plate, and welding the four edges and the middle of the two rectangular plates to form a plurality of isolated welding lines, wherein the plurality of isolated welding lines constitute a serpentine turbulent flow channel; Arranging welding points in the turbulent flow channel according to preset rules; The preset rule is multiple rows of transverse welding point lines and multiple rows of longitudinal welding point lines, and the welding points between the transverse and longitudinal welding point lines are arranged in a staggered manner; the transverse welding point lines refer to the welding point lines arranged along the axis direction of the cylinder, and the longitudinal welding point lines refer to the welding point lines arranged along the circumference of the cylinder; The spacing between adjacent welding spots in the transverse welding spot line is greater than the spacing between adjacent welding spots in the longitudinal welding spot line; Step 2: opening a pressure charging port on the second rectangular plate, rolling the hot plate with the pressure charging port into a cylindrical plate, and after the curling is completed, welding the joints of the cylindrical structure to form a splicing welding line to ensure the stability and sealing of the entire cylindrical structure; the second rectangular plate serves as the outer surface of the cylindrical plate; Step 3, charging pressure into the turbulent flow channel through the charging port, so that the turbulent flow channel bulges outward until a preset height is reached; Step 4: cut off the charging port, and set an inlet and outlet pipe connected with the turbulent flow channel on the cylindrical plate to obtain a cylindrical hot plate.

2. The manufacturing method of the cylindrical hot plate according to claim 1, characterized in that The welding lines at the four edges of the two rectangular plates are double welding lines; The isolation welding wire is a single welding wire and / or a double welding wire.

3. The manufacturing method of the cylindrical hot plate according to claim 1, characterized in that, Filling the turbulent flow channel with pressure through the pressure charging port to cause the turbulent flow channel to bulge outward until a preset height is reached, specifically comprising: The charging port is charged with pressure for multiple times in a gradient pressure-increasing manner, and the bulging height of the cylindrical plate is measured after each charging is completed; The pressure of the gradient boost is adjusted according to the measurement results until the hot plate of the cylindrical plate reaches the preset height.

4. The manufacturing method of the cylindrical hot plate according to claim 3, characterized in that, Adjust the pressure of the gradient boost according to the measurement results, including: Determining a pressure difference according to a difference between the measurement result and the preset height; The current charging pressure is determined according to the pressure difference and the previous charging pressure.

5. The manufacturing method of the cylindrical hot plate according to claim 1, characterized in that, The step 4 also includes: After reaching the preset height, the pressure is stopped and the pressure is maintained for a preset period of time.

6. The method for manufacturing a cylindrical hot plate according to claim 1, characterized in that: The turbulent flow channels include a plurality of turbulent flow channels.

7. The manufacturing method of the cylindrical hot plate according to claim 1, characterized in that, The step 3 also includes: A support member is provided in the cylindrical plate; The support member is an annular structure and is arranged on the inner surface of the cylindrical plate to prevent the cylindrical plate from excessive deformation.

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