Manufacturing method of cylindrical hot plate

Abstract

The invention belongs to the technical field of hot plate manufacturing, and discloses a manufacturing method of a cylindrical hot plate, which comprises the following steps of: 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; 2, a pressurizing opening is formed in a second rectangular plate, the hot plate with the pressurizing opening is rolled into a barrel-shaped plate, and the second rectangular plate serves as the outer surface of the barrel-shaped plate; 3, the turbulent flow channel is pressurized through a pressurizing opening, so that the turbulent flow channel is expanded outwards until the turbulent flow channel reaches the preset height; and 4, the pressurizing opening is cut off, an inlet and an outlet communicating with the turbulent flow channel are formed in the cylindrical plate, and the cylindrical hot plate is obtained. The inner plate and the outer plate with different thicknesses are adopted, and uneven deformation of a conventional equal-thickness plate is avoided; through the arrangement rule of the welding spots, the roundness of the cylindrical hot plate after deformation is ensured; by arranging the supporting piece, the uniformity is improved; and the complete plate sheet is pressurized and expanded, so that the roundness of the cylinder structure is ensured to the greatest extent, and the uniformly expanded cylinder-shaped hot plate is obtained.

Description

Technical Field

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

[0002] The manufacturing process of the heat plate, a component with a unique three-dimensional wavy heat exchange surface, involves stacking two metal plates and arranging weld lines on the edges and setting weld points in the middle. The outer rings of these weld lines and weld points are seam welded using laser welding technology to form an integral structure. Subsequently, the integral structure is pressurized with a pressurized fluid (such as water or nitrogen) to cause plastic deformation of the plates, and finally form the required fluid channels inside the two metal plates.

[0003] In the conventional forming method of the hot plate, the laser welding of the two metal sheets at the welding line and welding point is first completed, and then the plate part of the inlet and outlet is cut off and the inlet and outlet pipes are welded. After that, pressurized water or nitrogen is introduced from the pipe to achieve pressure bulging deformation of the plate. According to different process requirements, the hot plate can be designed into a straight plate type, a semicircular type or a cylindrical type, and the fluid channel can also be divided into a straight flow type, a baffle type and a cross flow type.

[0004] However, in the actual processing, the final forming effect of the hot plate is affected by many factors, including the shape of the hot plate, the distribution of flow channels, the distribution of welding points, the setting of welding lines, and the processing of the inlet and outlet pipes, etc. Especially for cylindrical hot plates with a diameter of DN≤800mm and a height of H≥1m, the conventional forming method will cause the whole cylindrical hot plate to be severely deformed after being compressed, the local bulging is obviously uneven, and the multiple welding points at the intersection of the welding lines will remain in their original state in a row without deformation, thereby blocking the fluid channel. 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 the conventional forming method in the prior art will cause the cylindrical hot plate to be severely deformed as a whole after being pressed, the local bulging is obviously uneven, and multiple welding points at the intersection of welding lines will remain in their original state in a row without deformation, thereby blocking the fluid channel. To achieve the above purpose, the present invention proposes a method for making a cylindrical hot plate, and the specific scheme is as follows: A method for manufacturing a cylindrical hot plate comprises the following steps: 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; 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 using the second rectangular plate 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 connected to the turbulent flow channel on the cylindrical plate to obtain a cylindrical hot plate.

[0006] Preferably, the step 1 specifically includes: 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; And welding points are arranged in the turbulent flow channel according to preset rules.

[0007] Preferably, the preset rule is multiple rows of horizontal welding point lines and multiple rows of vertical welding point lines, and the welding points between the horizontal and vertical welding point lines are staggered.

[0008] Preferably, 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.

[0009] Preferably, 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.

[0010] Preferably, charging pressure into the turbulent flow channel through the 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.

[0011] Preferably, adjusting the pressure of the gradient boost according to the measurement result specifically includes: 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.

[0012] Preferably, before step 4, the step further includes: After reaching the preset height, the pressure is stopped and the pressure is maintained for a preset period of time.

[0013] Preferably, the thickness of the first rectangular plate is greater than the thickness of the second rectangular plate; The turbulent flow channels include a plurality of turbulent flow channels.

[0014] Preferably, before step 3, the method further 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.

[0015] Beneficial effects:

[0016] 1. The present invention adopts inner and outer plates (first rectangular plate and second rectangular plate) of unequal thickness, fully considering the effect of the inner plate (first rectangular plate) of the cylinder being pressed into a circle and the outer plate (second rectangular plate) being pressed into a flattening, avoiding the problems of different degrees of deformation and overall uneven deformation caused by the use of inner and outer plates of equal thickness in conventional hot plate forming, and improving the stability and uniformity of the cylindrical plate during the deformation process.

[0017] 2. Based on the comprehensive analysis of practice and simulation research, this application clearly stipulates the layout principle of the welds: that is, along the axial direction of the cylinder, the horizontal weld pitch should be greater than or equal to the longitudinal weld pitch. This layout strategy is intended to avoid the edge effect that may be caused when the welds are staggered in the vertical (or horizontal) direction, which will cause excessive constraints in the local area and thus 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.

[0018] 3. The present invention precisely fixes the outer ring of the support member at the double welding line position of the cylindrical plate and designs the layout of the support member to avoid direct contact with the area on the cylindrical plate that needs to be deformed. 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 can effectively 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.

[0019] 4. The conventional hot plate forming method is to cut off the plate at the connecting pipe before rolling the cylinder, expand the pipe manually, weld the required inlet and outlet connecting pipes, and then pressurize and bulge from the connecting pipe to the space between the two plates. Local deformation is easy to occur in this process, resulting in uneven swelling due to uneven structure. The present invention welds the outer plate through a charging port at the flow channel inlet, expands the pipe near the charging port through instruments and tools, and then welds a connecting pipe vertically to the plate as a charging pipe. After pressure forming, the plate at the connecting pipe is cut off, and the inlet and outlet connecting pipes are welded to ensure the roundness of the cylinder structure before deformation to the greatest extent, so as to obtain a cylindrical hot plate with uniform expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall layout of the heat plate in an embodiment of the present invention; Figure 2 A schematic diagram of the pitch of solder joints in an embodiment of the present invention; Figure 3 This is a schematic diagram of the front view of the outer panel in an embodiment of the present invention; Figure 4 It is a schematic diagram of the structure of the cylindrical plate in an embodiment of the present invention; Figure 5It is a cross-sectional schematic diagram of a cylindrical plate end support member in an embodiment of the present invention; 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; Figure 7 It is a curve diagram of the expansion pressure change in the embodiment of the present invention; 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; Fig. 9 It is a cross-sectional schematic diagram of the hot plate bulging forming in an embodiment of the present invention.

[0021] 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

[0022] 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.

[0023] 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 Figure 1-9 The pressure forming method is described in detail, and the specific steps are as follows: 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.

[0024] Specifically, two rectangular metal plates of different thicknesses are selected for overlapping welding, and the two rectangular metal plates are respectively recorded as a first rectangular plate and a second rectangular plate, wherein the thickness of the first rectangular plate is greater than the thickness of the second rectangular plate. 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.

[0025] In this embodiment, the dimensions of the first rectangular plate are: length 1414mm (matching the circumference of the cylindrical hot plate), width (cylinder height) 1500mm, thickness 1.5mm; the dimensions of the second rectangular plate are: length 1414mm, width (cylinder height) 1500mm, thickness 1.2mm. Both metal plates are made of S30408 ​​material.

[0026] Conventional hot plate forming uses inner and outer plates of equal thickness. Since the inner plate (first rectangular plate) in the cylindrical plate is subjected to external pressure and the outer plate (second rectangular plate) is subjected to internal pressure, under the same inflation pressure, the inner and outer plates of the cylinder of the same thickness produce different degrees of deformation, which will lead to uneven overall deformation of the cylindrical plate after pressurization. The present invention uses inner and outer plates of unequal thickness, and the inner plate is 0.2~0.5mm thicker than the outer plate. Based on the effect of the cylinder's internal pressure tending to roundness and external pressure tending to flattening, inner and outer plates of different thicknesses are selected to improve the stability and uniformity of the deformation process of the cylindrical plate.

[0027] In the embodiment of the present invention, the first rectangular plate and the second rectangular plate are overlapped, and the four edges and the middle part of the two rectangular plates are welded to form a plurality of isolation welding lines, and the plurality of isolation welding lines constitute a serpentine turbulent flow channel; and welding points 1 are set in the turbulent flow channel according to preset rules.

[0028] Specifically, Figure 1 As shown, in this embodiment, after the first rectangular plate and the second rectangular plate are stacked, the edges and the middle area are welded. Double welding lines are arranged around the plate to enhance the edge strength, and the double welding lines are recorded as edge double welding lines 2. In this embodiment, the outer side of the edge double welding line 2 is 7.5 mm away from the edge of the metal plate, and the width between the double welding lines is 5 mm. At the same time, a first isolation welding line parallel to the cylinder axis, namely the middle double welding 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 welding lines parallel to the cylinder axis can be set to form N+1 flow channels.

[0029] In the middle of the plate, there are also multiple second isolation welding lines, namely, deflection welding lines, which are welded perpendicular to the first isolation welding line. The second isolation welding line is used to separate the flow channel into a serpentine shape. The first isolation welding line and the second isolation welding line are single welding lines and / or double welding lines. In this embodiment, there are three second isolation welding lines for each flow channel, which divide the flow channel into four-way serpentine flow channels. The width of each flow channel is W≈203mm. The three second isolation welding lines are arranged in parallel along the extension direction of the cylinder axis, and the ends of adjacent second isolation welding lines have a preset staggered length D, and the length of D is D≥1 / 3W. One end of the first and third second isolation welding lines is perpendicularly connected to the side of the metal plate, and the other end is a preset distance A from the first isolation welding line, and the length of A is within ±10% of the flow channel width W, that is, the absolute length of A is 0.9W≤A≤1.1W, ensuring that the flow area of ​​the entire flow channel is equivalent, and it is designed as a single welding line, which is recorded as a deflection single welding line 3; one end of the second second isolation welding line is perpendicularly connected to the first isolation welding line, and the other end is a preset distance B from the side of the metal plate, and the length of B is within ±10% of the flow channel width W, that is, the absolute length of B is 0.9W≤B≤1.1W, ensuring that the flow area of ​​the entire flow channel is equivalent, and it is designed as a double welding line, which is recorded as a deflection double welding line 4. Specifically, in this embodiment, Figure 1 As shown, the preset staggered length D=258mm, the preset distance A=209mm between the end of the baffled single welding line 3 and the first isolation welding line, the preset distance B=225mm between the end of the baffled double welding line 4 and the side of the metal plate, and the welding line width of the baffled double welding line 4 is 40.7mm, which is used to place the support. It should be noted that the number of second isolation welding lines can be determined by those skilled in the art according to actual process requirements.

[0030] In the embodiment of the present invention, the preset rule is multiple rows of horizontal welding point lines and multiple rows of vertical welding point lines, and the welding points 1 between the horizontal and vertical welding point lines are staggered. The spacing between adjacent welding points 1 in the horizontal welding point line is greater than the spacing between adjacent welding points 1 in the vertical welding point line.

[0031] Inside the flow channel, the weld points 1 are arranged according to preset rules. These weld points 1 are distributed in a specific manner, and finally form a criss-cross weld point line network. In this embodiment, the weld point lines are specifically composed of multiple rows of transverse weld point lines and multiple rows of longitudinal weld point lines, and the weld points 1 are arranged on these weld point lines. It is worth noting that the transverse weld point lines refer to the weld point lines arranged along the axis direction (axial direction) of the cylinder, while the longitudinal weld point lines are arranged along the circumference of the cylinder. Figure 2 As shown, in order to quantify the distribution of solder joints 1, the lateral solder joint pitch (S T ) is used to represent the distance between adjacent solder joints 1 in the horizontal solder joint line. Similarly, the longitudinal solder joint pitch (2S L ) is used to represent the distance between adjacent solder joints 1 in the longitudinal solder joint line. T Greater than or equal to 2SL In this specific implementation case, the horizontal solder joint pitch S T The specific setting is 81.4mm, and the longitudinal solder joint pitch is 2S L Each welding point 1 and its surrounding welding points 1 constitute a welding point unit 5.

[0032] Based on a comprehensive analysis of practice and simulation research, this application clearly stipulates the layout principle of weld point 1: that is, the horizontal weld point pitch should be greater than or equal to the longitudinal weld point pitch. This layout strategy is intended to avoid the edge effect that may be caused when the weld lines are staggered in the vertical (or horizontal) direction, which will cause excessive constraints in the local area and thus 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.

[0033] 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 using the second rectangular plate as the outer surface of the cylindrical plate; 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 flow channel I, the outlet position 8 of flow channel I, the inlet position 9 of flow channel II and the outlet position 10 of flow channel II are all in the following manner: Figure 1 Specific settings for the locations shown.

[0034] Next, two charging ports are opened on the second rectangular plate. The two charging ports are located at the inlet of flow channel I and flow channel II respectively (to facilitate cutting off the charging ports when setting the inlet and outlet later). Figure 3 As shown, two circular holes are opened on the second rectangular plate, and an instrument tool is used to expand the pipe along the vicinity of the circular holes, and then the pipe is vertically welded to the metal plate to form the flow channel I pressure charging port 11 and the flow channel II pressure charging port 12.

[0035] Finally, the hot plate is rolled into a cylindrical shape, wherein the first rectangular plate is located inside the cylinder and the second rectangular plate is located outside the cylinder. After the rolling is completed, the connection of the cylinder structure is precisely welded to form a splicing weld line 13 to ensure the stability and sealing of the entire cylinder structure.

[0036] In the embodiment of the present invention, a support member is arranged inside the cylindrical plate; the support member is an annular structure, arranged on the inner surface of the cylindrical plate, and is used to prevent the cylindrical plate from excessive deformation.

[0037] Specifically, Figure 4 , Figure 5 and Figure 6As shown, during the rolling process, the first end support 14 and the second end support 16 are respectively arranged at the positions of the double welding lines at both ends of the cylindrical structure, and the middle support 15 is arranged in the middle part of the cylindrical structure, that is, the position of the baffle double welding line 4. These support members are designed with an annular structure, and their outer edges are tightly fitted with the inner surface of the cylindrical plate and fixed at the contact points by spot welding. It is particularly important to note that Figure 6 As shown, in order to prevent the support from having an adverse effect on the bulging deformation of the cylindrical plate, the intermediate support 15 at the baffle double weld line 4 needs to be adjusted according to the distribution of the welding points 1, that is, the contact between the intermediate support 15 and the baffle double weld line 4 is spot-welded to the inner wall, while in the area where the welding points of the serpentine flow channel are distributed and the baffle double weld line 4 is not set, the edge of the intermediate support 15 needs to be cut and must not contact the plate to prevent constraints on the bulging forming process.

[0038] It should be noted that, in this embodiment, the distance between the support members is set to be about 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 welding wires.

[0039] The present invention precisely fixes the outer ring of the support member at the double welding line position of the cylindrical plate and designs the layout of the support member to avoid direct contact with the area on the cylindrical plate that needs to be deformed. 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 can effectively 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.

[0040] 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; Specifically, the pressure is charged between the inner and outer plates through the charging port, and the swelling pressure is increased in a gradient manner to cause the first rectangular plate and the second rectangular plate to bulge and deform inward and outward until a preset height is reached, thereby forming the turbulent flow channel.

[0041] Furthermore, the charging port is pressurized multiple times in a gradient pressure-increasing manner, and the bulging height of the cylindrical plate is measured after each charging; and the gradient pressure-increasing pressure is adjusted according to the measurement result until the hot plate of the cylindrical plate reaches a preset height.

[0042] The charging port is pressurized multiple times in a gradient pressure-raising manner, and the bulging height of the cylindrical plate is measured after each charging. The bulging stage is determined based on the measurement result, and different pressure gradients are used in different stages to determine the next bulging pressure until the thermal plate deformation of the cylindrical plate reaches a preset height.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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 Fig. 9 shown.

[0048] 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.

[0049] 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 .

[0050] 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.

[0051] 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.

[0052] The above are only several embodiments of the present invention and are not intended to limit the present invention in any form. Although the present invention is disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, using the above disclosed technical content to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A method for manufacturing 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; 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 using the second rectangular plate 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 connected to the turbulent flow channel on the cylindrical plate to obtain a cylindrical hot plate.

2. The method for manufacturing a cylindrical hot plate according to claim 1, characterized in that: The step 1 specifically includes: 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; Welding points are arranged in the turbulent flow channel according to preset rules.

3. The method for manufacturing a cylindrical hot plate according to claim 2, characterized in that: The preset rule is multiple rows of horizontal welding point lines and multiple rows of vertical welding point lines, and the welding points between the horizontal and vertical welding point lines are arranged in a staggered manner.

4. The method for manufacturing a cylindrical hot plate according to claim 3, characterized in that: 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.

5. The method for manufacturing a cylindrical hot plate according to claim 2, 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.

6. The method for manufacturing a 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.

7. The method for manufacturing a cylindrical hot plate according to claim 6, 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.

8. The method for manufacturing a 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.

9. The method for manufacturing a cylindrical hot plate according to claim 1, characterized in that: The thickness of the first rectangular plate is greater than the thickness of the second rectangular plate; The turbulent flow channels include a plurality of turbulent flow channels.

10. The method for manufacturing a cylindrical hot plate according to claim 1, characterized in that: Before step 3, the following steps are also included: 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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