Precise forming method for metal corrugated plate with complex flow field structure

Abstract

The embodiment of the invention provides a precise forming method for a metal corrugated plate with a complex flow field structure. The precise forming method comprises the steps of mold design optimization; pressing equipment and pressing parameters are determined, matched pressing equipment is selected from the purchased pressing equipment according to the plate parameters and the mold parameters, and the pressing parameters are determined according to the selected pressing equipment; the plate to be pressed is subjected to protection treatment in the pressing process; plate verification detection and pressing parameter adjustment are conducted, specifically, the pressed and formed plate is verified and detected, the pressing parameters are adjusted according to the deviation value, and then pressing is conducted again till the pressed and formed plate meets the precision requirement; and the plates are pressed in batches according to the pressing parameters used at the last time. According to the embodiment of the invention, through cooperative implementation of all the steps, the defects of a traditional pressing process are effectively overcome, high-precision and standardized metal corrugated plate pressing forming is realized, the pressing precision of the metal corrugated plate is remarkably improved, and the forming quality and the use stability of the metal corrugated plate are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of processing and manufacturing of metal corrugated plates with complex flow field structures, and in particular to a precise forming method for metal corrugated plates with complex flow field structures. Background Art

[0002] A metal corrugated plate is a wavy metal plate with a complex flow field structure formed by stamping or machining. Its corrugated structure endows it with good strength and rigidity. The forming accuracy and quality of the flow field structure directly affect the heat exchange efficiency of the equipment and the uniformity of fluid distribution, and have an important impact on the performance, working life and reliability of equipment such as heat exchange. In fields such as plate heat exchangers, hydrogen fuel cells, and microchannel heat exchangers, metal corrugated plates play a crucial role as core heat exchange components.

[0003] Due to its high heat exchange efficiency, compact structure and good adaptability, plate heat exchangers are widely used in many industrial fields and civil facilities, such as ships, heating, ventilation and air conditioning, electric power and chemical industries. Metal corrugated plates act as medium separation and diversion components therein. Their corrugated structure can effectively increase the heat exchange area and significantly improve the heat exchange efficiency. At the same time, the special shape of the corrugations prompts the fluid to form strong turbulence between the plates, further enhancing the heat transfer effect. Moreover, the good mechanical properties of metal corrugated plates can withstand the stresses generated by temperature and pressure changes during the heat exchange process, ensuring the stable operation and long-term durability of the equipment. As the core component of a plate heat exchanger, the forming accuracy of metal corrugated plates directly affects the heat exchange performance, sealing performance and service life of the heat exchanger.

[0004] In the prior art, the forming process of metal corrugated plates usually faces many challenges. For example, problems such as easy occurrence of plate rupture, wrinkling, or unreasonable design of pressing process parameters leading to uneven corrugation depth and poor accuracy may occur, thereby affecting the quality stability of the entire plate heat exchanger. For example, when the corrugation depth of the metal corrugated plate is too shallow, the heat exchange area will be reduced and the heat exchange efficiency will be lowered; if the corrugation depth is too deep or uneven, it may cause uneven fluid distribution, increase the flow resistance, and even lead to local overheating or overcooling, affecting the normal operation of the equipment. In addition, poor pressing accuracy or cracks appearing after forming will also cause poor sealing and leakage problems after the plate heat exchanger is assembled. Therefore, there is an urgent need for a scientific and precise precise forming method for metal corrugated plates with complex flow field structures to ensure product quality and meet the usage requirements. Summary of the Invention

[0005] In view of the above problems existing in the prior art, an embodiment of the present invention provides a precise forming method for metal corrugated plates with complex flow field structures to solve the technical problem of poor pressing accuracy in the prior art.

[0006] An embodiment of the present invention provides a precision forming method for a metal corrugated plate with a complex flow field structure, including the following steps:

[0007] Step S1, die design optimization: perform 3D modeling on the pressing die, use simulation technology to perform simulation analysis on the pressing process, and determine the final die design scheme for pressing.

[0008] Step S2, determine the pressing equipment and pressing parameters: select a matching pressing equipment from the purchased pressing equipment according to the sheet parameters and die parameters, and determine the pressing parameters according to the selected pressing equipment.

[0009] Step S3, perform protective treatment on the sheet to be pressed during the pressing process to avoid problems such as scratches, wrinkles, oxidation and rust, and cracking of the sheet during the pressing process.

[0010] Step S4, sheet inspection and pressing parameter adjustment: after pressing is completed, inspect and test the pressed sheet, and adjust the pressing parameters according to the deviation amount and re-press until the pressed sheet meets the accuracy requirements.

[0011] Step S5, perform batch pressing on the sheet according to the pressing parameters used in the last time of Step S4.

[0012] In one embodiment, the specific steps of Step S1 include:

[0013] Step S11, according to the target size, corrugation shape and accuracy requirements of the metal corrugated plate, synchronously design at least two sets of die design schemes with different structural parameters, and synchronously model with the help of modeling software.

[0014] Step S12, perform simulation pressing on each set of die design schemes with the help of simulation analysis software, and screen out the optimal die design scheme through comparative analysis.

[0015] In one embodiment, the specific steps of Step S2 include:

[0016] Step S21, select a matching pressing equipment from the purchased pressing equipment according to the sheet parameters and die parameters and in combination with the pressing parameters used in the last time during the simulation analysis process of Step S1.

[0017] Step S22, obtain the usage records of the selected pressing equipment, and determine the pressing parameters with reference to the usage records.

[0018] In one embodiment, the protective treatment methods described in Step S3 include an oil brushing protection method and a film covering protection method.

[0019] In one embodiment, the specific steps of Step S4 include:

[0020] Step S41: Determine the measuring points for the corrugation parameters according to the sheet parameters of the metal corrugated sheet.

[0021] Step S42: After the pressing is completed, use a depth dial indicator to measure the corrugation depth at the preset points to evaluate the pressing accuracy of the metal corrugated sheet.

[0022] Step S43: Adjust the pressing parameters according to the deviation.

[0023] Step S44: Repress the sheet using the adjusted pressing parameters.

[0024] Step S45: Repeat Steps S41 to S44 until the pressed metal corrugated sheet meets the accuracy requirements.

[0025] Step S46: Add and save the pressing adjustment process to the usage record of the current pressing equipment.

[0026] In one embodiment, the method for adjusting the pressing parameters includes at least one of increasing or decreasing the pressing pressure, extending or shortening the pressure holding time, and adding copper foils on the top of the upper die base.

[0027] In one embodiment, the operation of adding copper foils includes:

[0028] Scratch lines on the top of the upper die base, and evenly divide the die core distribution area on the top of the upper die base into several sub - regions.

[0029] Determine the position of the sub - region corresponding to the range of the sheet that does not meet the accuracy after pressing.

[0030] Add copper foils on the top of the upper die base within the corresponding sub - region range.

[0031] In one embodiment, the copper foil selected is a copper foil with a single - layer thickness of 0.05 mm.

[0032] In one embodiment, the adjustment of the pressing pressure and the pressure holding time is implemented in the order from small to large.

[0033] In one embodiment, the number of layers of the copper foil padding is implemented in the order from few to many.

[0034] Compared with the prior art, the beneficial effects of a precision forming method for a metal corrugated sheet with a complex flow field structure provided by an embodiment of the present invention are as follows: Through the coordinated implementation of each step, the embodiment of the present invention effectively overcomes the drawbacks of the traditional pressing process, realizes the precision pressing and forming of the metal corrugated sheet with high precision and standardization, significantly improves the pressing accuracy of the metal corrugated sheet, and ensures the forming quality and use stability of the metal corrugated sheet. Description of the Drawings

[0035] Figure 1Schematic diagram of the upper die structure of a pressing die for a metal corrugated plate of a plate heat exchanger, which is related to a precise forming method for a metal corrugated plate with a complex flow field structure provided by an embodiment of the present invention;

[0036] Figure 2 Schematic diagram of the lower die structure of a pressing die for a metal corrugated plate of a plate heat exchanger, which is related to a precise forming method for a metal corrugated plate with a complex flow field structure provided by an embodiment of the present invention;

[0037] Figure 3 Schematic diagram of the top area of the upper die base of a pressing die for a metal corrugated plate of a plate heat exchanger, which is related to a precise forming method for a metal corrugated plate with a complex flow field structure provided by an embodiment of the present invention;

[0038] Figure 4 Schematic diagram of the structure of a metal corrugated plate of a plate heat exchanger, which is related to a precise forming method for a metal corrugated plate with a complex flow field structure provided by an embodiment of the present invention. Detailed implementation manners

[0039] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific implementation manners.

[0040] Reference is made herein to the various aspects and features of the present application with reference to the accompanying drawings.

[0041] These and other features of the present application will become apparent from the following description of the preferred forms of the embodiments given as non - limiting examples with reference to the accompanying drawings.

[0042] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art can surely implement many other equivalent forms of the present application, which have the features as described in the claims and thus are all within the protection scope defined hereby.

[0043] When combined with the accompanying drawings, the above - mentioned and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description.

[0044] Hereinafter, specific embodiments of the present application will be described with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the present application and can be implemented in various ways. Well - known and / or repetitive functions and structures have not been described in detail to clarify the true intention according to the user's historical operations and to avoid unnecessary or redundant details from obscuring the present application. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but are merely used as a basis for the claims and a representative basis for teaching those skilled in the art to use the present application in substantially any suitable detailed structure in a diverse manner.

[0045] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," which may all refer to one or more of the same or different embodiments according to the present application.

[0046] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. Figures 1-4 , the preferred embodiments of the present invention are further described in detail:

[0047] like Figures 1-4 As shown, an embodiment of the present invention provides a method for precision forming a metal corrugated plate with a complex flow field structure, comprising the following steps:

[0048] Step S1, mold design optimization, three-dimensional modeling of the pressing mold, simulation analysis of the pressing process using simulation technology, and determination of the final mold design scheme for pressing, specifically including:

[0049] Step S11, according to the target size, corrugated shape and precision requirements of the metal corrugated plate, synchronously design at least two sets of mold design schemes with different structural parameters, and use modeling software to synchronously model. Conventional mold design relies mostly on experience, and generally designs a set of parameters and directly processes and forms a test. The feasibility and effectiveness of the design rely too much on experience, which is inefficient and there is no guarantee for the precision control of the designed mold when applied to the metal corrugated plate. In this embodiment, computer-aided design (CAD) and computer-aided engineering (CAE) software are used to perform three-dimensional modeling and simulation analysis on the pressing mold. The target size, corrugation shape, and precision requirements of the corrugated plate are determined. The core size parameters of the heat transfer area, the guide area, and the sealing gasket groove area are determined respectively. Multiple sets of mold solutions with different structural parameters are designed simultaneously. In the simulation environment, the material constitutive model obtained in the above steps is input to simulate the pressing process of the metal corrugated plate under different molds. The key indicators of the metal corrugated plate are focused on the forming thickness, corrugation characteristics, stress and strain distribution, etc. Through comparative analysis, the optimal mold design solution is selected to ensure that the mold structure can meet the high-precision pressing requirements of the metal corrugated plate, so that all parts of the metal corrugated plate are evenly stressed and deformed in a coordinated manner during the pressing process.

[0050] Step S12: Simulate and compress each set of mold design solutions using simulation analysis software, and select the optimal mold design solution through comparative analysis;

[0051] Step S2, determining the pressing equipment and pressing parameters, selecting a matching pressing equipment from the purchased pressing equipment according to the plate parameters and mold parameters, and determining the pressing parameters according to the selected pressing equipment, specifically including:

[0052] Step S21: Select a matching pressing device from the purchased pressing devices according to the sheet parameters, die parameters, and the pressing parameters used in the last time during the simulation analysis in Step S1. The pressing device should have both a fixed workbench and a movable workbench. In one embodiment, a wire-wound hydraulic device is selected, and a 2-mm thick aluminum plate is added at the joint of the fixed workbench and the lower semi-circular beam to offset the deformation generated after the winding of the lower semi-circular beam, so as to improve the rigidity of the movable workbench. At the same time, high-precision pressure sensors and displacement sensors are further installed to collect the pressure and die stroke during the pressing process in real time;

[0053] Step S22: Obtain the usage record of the selected pressing device, and determine the pressing parameters with reference to the usage record. Specifically, according to parameters such as the corrugation depth of the existing pattern, the blanking size, the material of the metal corrugated plate, the pressing pressure, and the holding time, it can be obtained that the forming pressure per 0.1 square meter of heat exchange area is about 500T - 800T. A larger value is taken for a thicker metal corrugated plate thickness and a deeper corrugation depth, and a smaller value is taken vice versa. The unit area pressure value of titanium plate material is about 40 - 70% of that of stainless steel material. According to the above empirical theory, predict the forming accuracy of the metal corrugated plate under the given pressing parameters. During actual production, input the above predicted pressing parameters, including the pressing pressure, the holding time, the pressing speed, etc., into the pressing device to complete the pressing process of the metal corrugated plate;

[0054] Step S3: During the pressing process, perform protective treatment on the sheet to be pressed to avoid scratches, wrinkles, oxidation and rust, and cracking problems during the pressing process. The protective treatment methods include oil brushing protection method and film covering protection method. For conventional metal corrugated sheets, direct pressing is prone to sheet cracking and wrinkling, and sometimes micro-cracks cannot be detected in time, resulting in leakage after assembly and posing a safety hazard. Therefore, during the pressing process of metal corrugated sheets, the self-protection of the sheets is crucial. For stainless steel sheets such as 304 / 316L, the oil brushing protection method can be adopted. Use precision stamping oil P-406, whose main components include sulfonated lard, oiliness agent, rust inhibitor and antioxidant, etc. These components make the precision stamping oil have good lubricity, rust resistance and oxidation resistance, and are suitable for the precision stamping forming protection of metal corrugated sheets. Before pressing, apply an extremely thin oil film on the surface of the stainless steel sheet. This oil film adheres tightly to the sheet surface through physical adsorption. During the pressing process, it can effectively reduce the friction between the sheet and the mold, avoid the influence of heat generated by friction on the forming of the metal corrugated sheet, and at the same time prevent the tiny particles on the mold surface from scratching the sheet surface, playing a good lubricating and protective role, thus avoiding surface defects such as micro-cracks after forming. On the other hand, this oil film can also isolate air and moisture, preventing the stainless steel sheet from oxidizing and rusting during the processing. For titanium sheets, due to their relatively low ductility, they are more likely to be damaged during the pressing and forming process. The oil brushing method cannot provide effective protection, so the film covering protection technology needs to be adopted. Select a special film with a thickness of 0.05 mm and closely fit it to the surface of the titanium sheet, which can play a buffering role during the pressing and forming process, forming a gap between the sheet and the mold, promoting a more uniform pressure distribution during the operation of the press, effectively avoiding the problem of uneven shrinkage caused by uneven pressure, reducing the risk of cracks occurring during the pressing and forming process of the sheet. At the same time, the film covering can also protect the titanium sheet in all directions, playing a role in waterproofing, anti-oxidation and anti-scratching, ensuring the integrity and performance stability of the titanium sheet during the pressing process, and improving the forming quality of the titanium material metal corrugated sheet;

[0055] Step S4: Inspection and testing of the sheet and adjustment of the pressing parameters. After pressing, inspect and test the pressed and formed sheet, and adjust the pressing parameters according to the deviation amount and then re-press until the pressed and formed sheet meets the accuracy requirements. Specifically,

[0056] Step S41: Determine the measuring points of the corrugation parameters according to the sheet parameters of the metal corrugated sheet;

[0057] Step S42: After pressing, use a depth dial gauge to measure the corrugation depth at the preset points to evaluate the pressing accuracy of the metal corrugated sheet;

[0058] Step S43: Adjust the pressing parameters according to the deviation amount. The adjustment methods of the pressing parameters include at least one of increasing or decreasing the pressing pressure, extending or shortening the holding pressure time, and adding a copper foil pad on the top of the upper die base. When adjusting, first adjust the pressing parameters according to the deviation amount, such as appropriately increasing or decreasing the pressing pressure, extending or shortening the holding pressure time, etc., to ensure that the metal corrugated plate can approach and finally reach the predetermined pressing accuracy under dynamic adjustment. For individual parts that cannot be solved by adjusting the pressing parameters, measure the size of the area range, and use the method of adding a copper foil pad on the upper part of the upper die to adjust. Due to the high pressing accuracy requirements, a copper foil with a single-layer thickness of 0.05 mm is selected here. After cutting according to the measured area range size above, it is laid flat at the corresponding position of the upper die, and repeatedly pressed, measured and adjusted. Among them, the operation of adding a copper foil pad includes,

[0059] Draw lines on the top of the upper die base, and evenly divide the die core distribution area on the top of the upper die base into several sub-areas;

[0060] Determine the position of the sub-area corresponding to the range of the plate that does not meet the accuracy after pressing;

[0061] Add a copper foil pad within the corresponding sub-area range on the top of the upper die base;

[0062] Step S44: Re-press the plate using the adjusted pressing parameters. Of course, in this process, in order to reduce material waste, the adjustment of the pressing parameters is implemented in the order from small to large (that is, the adjustment of the pressing pressure and the holding pressure time is implemented in the order from small to large, and the number of layers of the copper foil pad is implemented in the order from few to many), to ensure that if there is a situation where the quality of the corrugated plate formed by the previous pressing does not meet the requirements, it can be further utilized by the method of re-pressing. Of course, for the situation of overpressure, a new plate needs to be replaced for adjustment test;

[0063] Step S45: Repeat Step S41 to Step S44 until the pressed metal corrugated plate meets the accuracy requirements;

[0064] Step S46: Add and save the pressing adjustment process to the usage record of the current pressing equipment to guide the determination of parameters during the subsequent plate pressing;

[0065] Step S5: Batch-press the plate according to the pressing parameters used in the last time of Step S4.

[0066] Example 1:

[0067] P350 metal corrugated plate, made of 316L stainless steel, with blanking size A*B, the thickness of the metal corrugated plate is 0.7mm, the precision control standard of the corrugation depth of the metal corrugated plate is a±0.2mm. In the actual process of pressing the metal corrugated plate into shape, the pressing corrugation depth precision should be improved as much as possible, and the internal control standard is a±0.1mm. The value range of A is [2580,2620], the value range of B is [980,1020], and the value range of a is [2.2,2.8].

[0068] 1. Die design optimization

[0069] According to the size specifications (length A, width B) and corrugation shape (herringbone corrugation) of the metal corrugated plate, use CAD software to design 3 groups of different die structures, and determine the die core size parameters of the heat transfer area, flow guide area, and gasket groove area respectively.

[0070] Import the designed die model into CAE software, and combine the established material constitutive model to simulate the pressing process of the metal corrugated plate. After multiple rounds of simulation comparison, select a set of die design schemes. This scheme can control the deviation of the corrugation depth of the metal corrugated plate within ±0.1mm during the simulated pressing, meeting the design standard requirements.

[0071] P350 die core machining corrugation depth

[0072]

[0073] 2. Determination of pressing parameters

[0074] Install a pressure sensor with an accuracy of 0.1MPa and a displacement sensor with an accuracy of 0.01mm on a 20000T double-cylinder hydraulic press. Collect the production data of other types of metal corrugated plates, including the metal corrugated plate model, metal corrugated plate material, metal corrugated plate thickness, blanking size, pressing pressure, and holding time parameters, and calculate the P350 pressing parameters. The operator sets the pressing parameters of this metal corrugated plate on the control system interface: pressing pressure 70MPa, holding time 2s, and operates the hydraulic press to press the metal corrugated plate into shape according to these parameters.

[0075] 3. Oil brushing protection during the pressing process of 316L sheet

[0076] For the 316L stainless steel sheet used in this embodiment, the precision stamping oil P-406 brushing protection method can be adopted. Before pressing, brush a very thin oil film on the surface of the sheet, so that the oil film adheres tightly and evenly to the surface of the sheet through physical adsorption.

[0077] 4. Parameter feasibility detection and adjustment

[0078] After the pressing is completed for the first time, use a depth dial gauge to measure the corrugation depth at the preset points to evaluate the pressing accuracy of the metal corrugated plate. Adjust the pressing parameters according to the deviation amount, such as appropriately increasing or decreasing the pressing pressure, extending or shortening the holding pressure time, etc., to ensure that the metal corrugated plate can approach and finally reach the predetermined pressing accuracy under dynamic adjustment. For individual parts that cannot be solved by adjusting the pressing parameters, measure the size of the area, and adjust it by adding copper foil on the upper part of the upper die. Due to the high pressing accuracy requirements, copper foil with a single-layer thickness of 0.05 mm is selected here. After cutting according to the measured area size above, it is laid flat at the corresponding position of the upper die, and pressed and measured repeatedly for adjustment.

[0079] After each batch of plates is changed or the mold is replaced, conduct the first-piece inspection after starting the pressing. Perform the initial pressing according to the above parameters. If the corrugation depth changes, repeat the pressing, measurement, and adjustment according to the above method until the accuracy of the metal corrugated plate meets the standard. At the same time, record the details of this adjustment for subsequent analysis and optimization.

[0080] Use a depth dial gauge to detect the accuracy of the metal corrugated plate. After detection, the corrugation depth of the metal corrugated plate is a, and the thickness uniformity is controlled within ±0.07 mm, all meeting the design standards, and it is judged as a qualified product for warehousing. For individual unqualified metal corrugated plates found in subsequent spot checks, trace back to the corresponding production links, such as raw material batches, fluctuations in pressing parameters, etc., and take improvement measures to ensure the stability of product quality.

[0081] Example 2

[0082] The P250B metal corrugated plate is made of titanium plate, with the blanking size C*D, the thickness of the metal corrugated plate is 0.5 mm, and the accuracy control standard for the corrugation depth of the metal corrugated plate is b±0.15 mm. In the actual process of pressing and forming the metal corrugated plate, the pressing corrugation depth accuracy should be improved as much as possible, and the internal control standard is b±0.08 mm, where the value range of C is [2230, 2270], the value range of D is [730, 770], and the value range of b is [2.4, 2.8].

[0083] 1. Die design optimization

[0084] According to the size specifications (length C, width D) and corrugation shape (herringbone corrugation) of the metal corrugated plate, use CAD software to design 3 groups of different die structures, and determine the die core size parameters of the heat transfer area, the flow guide area, and the sealing gasket groove area respectively.

[0085] Import the designed die model into CAE software, and combine the established material constitutive model to simulate the pressing process of the metal corrugated plate. After multiple rounds of simulation comparison, select a set of die design schemes. This scheme can control the deviation of the corrugation depth of the metal corrugated plate within ±0.08 mm during the simulated pressing, meeting the requirements of the design standards.

[0086] Ripple depth of P250B die core machining

[0087]

[0088] 2. Determination of pressing parameters

[0089] Install a pressure sensor with an accuracy of 0.1 MPa and a displacement sensor with an accuracy of 0.01 mm on a 20000T double - cylinder hydraulic press. Collect production data of other types of metal corrugated plates, including metal corrugated plate models, metal corrugated plate materials, metal corrugated plate thicknesses, blanking sizes, pressing pressures, and holding time parameters, and calculate the pressing parameters for P250B. The operator sets the pressing parameters for this metal corrugated plate on the control system interface: the pressing pressure is 52 MPa and the holding time is 2 s, and operates the hydraulic press to press and form the metal corrugated plate according to these parameters.

[0090] 3. Film covering protection during the pressing process of titanium plates

[0091] For the titanium - material plates used in this embodiment, a film - covering protection method can be adopted. Before pressing, a special film with a thickness of 0.05 mm is closely attached to the surface of the titanium plate.

[0092] 4. Feasibility detection and adjustment of parameters

[0093] For the first time, after pressing is completed, use a depth dial indicator to measure the ripple depth at the preset points to evaluate the pressing accuracy of the metal corrugated plate. Adjust the pressing parameters according to the deviation amount, such as appropriately increasing or decreasing the pressing pressure, extending or shortening the holding time, etc., to ensure that the metal corrugated plate can approach and finally reach the predetermined pressing accuracy under dynamic adjustment.

[0094] For individual parts that cannot be solved by adjusting the pressing parameters, measure the size of the area, and adopt the method of adding copper foil pads on the upper part of the upper die. Due to the high pressing accuracy requirements, a single - layer copper foil with a thickness of 0.05 mm is selected here, cut according to the measured area size above and laid flat at the corresponding position of the upper die, and repeatedly pressed and measured for adjustment.

[0095] After each change of the plate batch or replacement of the die, conduct a first - piece inspection after starting the pressing. Conduct the initial pressing according to the above parameters. If the ripple depth changes, repeatedly press and measure for adjustment according to the above method until the accuracy of the metal corrugated plate meets the standard. At the same time, record the details of this adjustment for subsequent analysis and optimization.

[0096] Use a depth dial indicator to conduct precision detection on the corrugated metal sheet. After detection, the corrugation depth of the corrugated metal sheet is b, and the thickness uniformity is controlled within ±0.06 mm, all meeting the design standards, and it is determined as a qualified product for warehousing. For individual unqualified corrugated metal sheets found in subsequent spot checks, trace back to the corresponding production links, such as raw material batches, fluctuations in pressing parameters, etc., and take improvement measures to ensure the stable quality of the products.

[0097] The above embodiments are only exemplary embodiments of the present invention and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present invention, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present invention.

Claims

1. A precision forming method for a metal corrugated plate with a complex flow field structure, characterized in that, It includes the following steps: Step S1, die design optimization: perform 3D modeling on the pressing die, use simulation technology to conduct simulation analysis on the pressing process, and determine the final die design plan for pressing; Step S2, determine the pressing equipment and pressing parameters: select a matching pressing equipment from the purchased pressing equipment according to the sheet parameters and die parameters, and determine the pressing parameters based on the selected pressing equipment; Step S3, perform protective treatment on the sheet to be pressed during the pressing process to avoid problems such as scratches, wrinkles, oxidation and rust, and cracking of the sheet during the pressing process; Step S4, sheet verification and inspection and pressing parameter adjustment: after pressing is completed, verify and inspect the pressed sheet, and adjust the pressing parameters according to the deviation amount and then re-press until the pressed sheet meets the accuracy requirements; Step S5, perform batch pressing on the sheet according to the pressing parameters used in the last time of Step S4.

2. The precision forming method of a metal corrugated plate with a complex flow field structure according to claim 1, characterized in that: The specific content of Step S1 includes: Step S11, according to the target size, corrugation shape and accuracy requirements of the metal corrugated sheet, synchronously design at least two sets of die design plans with different structural parameters, and synchronously model with the help of modeling software; Step S12, perform simulation pressing on each set of die design plans with the help of simulation analysis software, and screen out the optimal die design plan through comparative analysis.

3. A precision forming method for a metal corrugated plate with a complex flow field structure according to claim 1, characterized in that: The specific content of Step S2 includes: Step S21, select a matching pressing equipment from the purchased pressing equipment according to the sheet parameters and die parameters and in combination with the pressing parameters used in the last time during the simulation analysis process of Step S1; Step S22, obtain the usage records of the selected pressing equipment, and determine the pressing parameters with reference to the usage records.

4. A precision forming method for a metal corrugated plate with a complex flow field structure according to claim 1, characterized in that: The protective treatment methods described in Step S3 include oil brushing protection method and film covering protection method.

5. A precision forming method for a metal corrugated plate with a complex flow field structure according to claim 1, characterized in that: The specific content of Step S4 includes: Step S41, determine the measuring points of the corrugation parameters according to the sheet parameters of the metal corrugated sheet; Step S42, after pressing is completed, use a depth dial indicator to measure the corrugation depth according to the preset points to evaluate the pressing accuracy of the metal corrugated sheet; Step S43, adjust the pressing parameters according to the deviation amount; Step S44, re-press the sheet with the adjusted pressing parameters; Step S45, repeat Steps S41 to S44 until the pressed metal corrugated sheet meets the accuracy requirements; Step S46, add and save the pressing adjustment process to the usage records of the current pressing equipment.

6. A precision forming method for a metal corrugated plate with a complex flow field structure according to claim 1 or 5, characterized in that: The pressing parameter adjustment methods include at least one of increasing or decreasing the pressing pressure, extending or shortening the holding time, and adding copper foil pads on the top of the upper die base.

7. A precision forming method for a metal corrugated plate with a complex flow field structure according to claim 6, characterized in that: The operation of adding copper foil pads includes: Scratch lines on the top of the upper die base, and evenly divide the die core distribution area on the top of the upper die base into several sub-areas; Determine the position of the sub-area corresponding to the range of the sheet where the pressed sheet does not meet the accuracy; Add copper foil pads within the corresponding sub-area range on the top of the upper die base.

8. A precision forming method for a metal corrugated plate with a complex flow field structure according to claim 7, characterized in that: The copper foil selected is a single-layer copper foil with a thickness of 0.05 mm.

9. A precision forming method for a metal corrugated plate with a complex flow field structure according to claim 6, characterized in that: The adjustment of the pressing pressure and the holding time is implemented in the order from small to large.

10. A precision forming method for a metal corrugated plate with a complex flow field structure according to claim 7, characterized in that: The number of layers of the copper foil pads is implemented in the order from few to many.

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