A method for controlling deformation of a wading neck and a rotational molding wading neck

Abstract

The application discloses a deformation control method of a water inlet and a rotational molding water inlet, and comprises the following steps: S1, estimating a deformation trend, according to an environmental temperature, combining a water inlet material shrinkage characteristic and a gap requirement of an installation point, selecting a constraint position to constrain the water inlet, analyzing a water inlet thermal deformation, and obtaining a deformation trend of the water inlet; S2, making a shaping tool, according to an external structure of the water inlet, combining the deformation trend of the water inlet, and making a corresponding shaping tool of the water inlet; S3, rotational molding processing, adjusting a cooling and taking-out time according to the environmental temperature; S4, shaping the shaping tool, putting the water inlet into the shaping tool, constraining the water inlet through the constraint position, combining the deformation trend of the water inlet, applying pressure to a surface of the water inlet, performing a reverse deformation constraint, and playing a role of orthopedics. The application can reserve a deformation amount in advance by combining the environmental temperature and the water inlet structure, guarantee the assembly of the water inlet, and improve the qualified rate of the water inlet.

Description

Technical Field

[0001] This invention relates to the field of wading hose technology, specifically to a method for controlling the deformation of a wading hose and a rotomolded wading hose. Background Technology

[0002] A snorkel, also known as a high-mounted air intake system, is designed to improve a vehicle's wading capability. During installation, the bottom of the snorkel is typically connected to the engine air intake, while the top of the snorkel protrudes from the end of the fender away from the A-pillar, protruding outside the vehicle and extending upwards along the fender and A-pillar, bringing the top of the snorkel close to the roof.

[0003] Currently, most snorkel assembly is based on the snorkel installation points, which are generally located at the A-pillar and fender of the car. Before assembling the snorkel, holes need to be drilled in these locations to reserve the installation positions. However, due to thermal expansion and contraction and internal stress during the manufacturing process, the snorkel may deform. Furthermore, because of the large temperature difference between the north and south, the snorkel may deform significantly during handling if the temperature difference between the two locations is large (often a 2mm shrinkage will affect the pass rate by more than 20%, currently the pass rate for snorkels is 35%). Therefore, if the installation point accuracy is not high, the snorkel may not be able to be assembled.

[0004] Therefore, the applicant proposes a deformation control method for a wading hood that can pre-determine the amount of deformation by combining ambient temperature and wading hood structure, as well as a rotomolded wading hood. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a deformation control method for wading hoses and a rotationally molded wading hose.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for controlling the deformation of a wading hose includes the following steps:

[0008] S1: Predict the deformation trend. Based on the ambient temperature, combined with the shrinkage characteristics of the wading hose material and the gap requirements of the installation points, select the constraint positions to constrain the wading hose, and analyze the thermal deformation of the wading hose to obtain the deformation trend of the wading hose.

[0009] S2: Make a shaping fixture. Based on the shape and structure of the wading hose and its deformation trend, make a shaping fixture for the wading hose and fix the selected constraint position on the shaping fixture.

[0010] S3: Rotational molding process, which produces waders using rotational molding technology, and the cooling and removal time is adjusted according to the ambient temperature.

[0011] S4: Shaping with a shaping fixture. The wading hose is removed from the mold and placed into the shaping fixture. The wading hose is constrained by the constraint position. In combination with the deformation trend of the wading hose, pressure is applied to the surface of the wading hose to perform anti-deformation constraint and play a corrective role.

[0012] Furthermore, the ambient temperature includes natural ambient temperature and factory ambient temperature.

[0013] Furthermore, the constraint positions for the snorkel are the A-pillar mounting point and / or the fender mounting point and / or the fender mounting surface and / or the A-pillar mounting surface.

[0014] Furthermore, the thermal deformation analysis of the wading throat was performed using CAE analysis technology.

[0015] Furthermore, the rotational molding process in S3 includes the following steps:

[0016] S3.1: Loading: Add the powdered raw material into the mold and close the mold;

[0017] S3.2: Rotational molding heating, the mold is transferred into a high-temperature processing chamber, the high-temperature processing chamber rotates and heats continuously, and the raw material in the mold is gradually coated, melted and adhered to the inner cavity of the mold under the action of centrifugal force and heat energy;

[0018] S3.3: Cooling. After heating is complete, remove the mold and cool it with a fan. Adjust the cooling and removal time according to the factory ambient temperature.

[0019] S3.4: Demolding, removing the product from the mold.

[0020] Furthermore, when the factory ambient temperature is 16-22℃, the cooling and part removal time is 30 minutes. With 3℃ as a unit, the cooling and part removal time is shortened by 1 minute for every unit increase in temperature change.

[0021] Furthermore, in S4, pressure is applied to the surface of the wading throat using a pressure device or sandbags.

[0022] Furthermore, mounting brackets are provided at both the A-pillar mounting point and the fender mounting point. The snorkel is mounted on the mounting brackets, with the length direction of the snorkel as the X direction, the direction perpendicular to the length of the snorkel as the Y direction, and the distance between one side of the mounting bracket and the mounting point at the A-pillar or fender position as D.

[0023] Furthermore, when the ambient temperature is -10 to 35°C, there is a variation of ±4mm in the X direction, a variation of ±3mm in the Y direction, and a variation of ±3mm in the distance D.

[0024] A rotationally molded wading hose, manufactured by the deformation control method of the wading hose described in any one of the above claims.

[0025] Compared with the prior art, the present invention provides a deformation control method for wading hoses and a rotationally molded wading hose, which has the following beneficial effects:

[0026] This invention utilizes ambient temperature, combined with the shrinkage characteristics of the snorkel material and the clearance requirements of the installation points, to select installation points at the A-pillar and fender locations, or / and the fender mounting surface, to constrain the snorkel. CAE analysis is performed on the thermal deformation of the snorkel to determine its deformation trend. Pre-fabricated tooling conforming to the snorkel's external shape is then manufactured. During the snorkel production stage, allowance is made for pre-emptive deformation to reduce deformation caused by thermal expansion and contraction and internal stress due to ambient temperature and manufacturing processes. The snorkel is then cooled and removed using ambient temperature adjustment. During the cooling process, the wader is placed inside the mold, constrained by the mold to correct its deformation. The wader is then removed from the mold and placed into the corresponding shaping fixture. Constraints are applied to the wader's surface based on its deformation trend, providing counter-deformation constraint and thus correcting its shape. This invention allows for pre-planning of deformation based on ambient temperature and wader structure, ensuring proper assembly. Using this deformation control method, the wader's pass rate has increased from 35% to 90%. Attached Figure Description

[0027] Figure 1 This is a graph showing the temperature of the wading nozzle over time in an embodiment of the present invention.

[0028] Figure 2 This is a graph showing the deformation of the wading nozzle over time in an embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the first constraint scheme in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the second constraint scheme in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the third constraint scheme in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the fourth constraint scheme in the embodiments of the present invention;

[0033] Figure 7 This is a schematic diagram of the fifth constraint scheme in the embodiments of the present invention;

[0034] Figure 8 This is a schematic diagram of the sixth constraint scheme in the embodiments of the present invention;

[0035] Figure 9 This is a diagram showing a variation of the first constraint scheme in an embodiment of the present invention;

[0036] Figure 10 This is a diagram showing a variation of the second constraint scheme in an embodiment of the present invention;

[0037] Figure 11 This is a diagram showing a variation of the third constraint scheme in an embodiment of the present invention;

[0038] Figure 12 This is a diagram showing a variation of the fourth constraint scheme in an embodiment of the present invention;

[0039] Figure 13 This is a diagram showing a variation of the fifth constraint scheme in this embodiment of the invention;

[0040] Figure 14 This is a diagram showing a variation of the sixth constraint scheme in an embodiment of the present invention;

[0041] Figure 15 This is a schematic diagram of a possible mating structure between the A-pillar and the mounting bracket of the present invention;

[0042] Figure 16 This is a schematic diagram of another possible matching structure between the A-pillar and the mounting bracket of the present invention.

[0043] Marked in the diagram: 1. Mounting bracket. Detailed Implementation

[0044] The present invention will be further described below with reference to embodiments:

[0045] This invention provides a method for controlling the deformation of a wading hose, comprising the following steps:

[0046] S1: Predict the deformation trend. Based on the ambient temperature, combined with the shrinkage characteristics of the wading hose material and the gap requirements of the installation points, select the constraint positions to constrain the wading hose, and analyze the thermal deformation of the wading hose to obtain the deformation trend of the wading hose.

[0047] In this embodiment, the ambient temperature includes natural ambient temperature and factory ambient temperature.

[0048] Specifically, natural ambient temperature refers to the temperature in various locations (such as the temperature at the production site and the installation site), while factory ambient temperature refers to the temperature inside the rotational molding factory. Therefore, this method requires understanding the temperature changes in various locations in advance, predicting the deformation trend, and reserving the amount of deformation in advance during the production stage of the water-filled nozzle.

[0049] Among them, the materials for the wading hose can be XLPE, XPE, PE and other materials.

[0050] Specifically, XLPE is cross-linked polyethylene, a thermosetting (elastomer) plastic with excellent properties such as simple structure, light weight, good heat resistance, strong load-bearing capacity, non-melting, chemical corrosion resistance, and high mechanical strength. The material shrinkage of XLPE (cross-linked polyethylene) is 3% to 5%, which can be measured according to the ASTM D955 method. By taking the material shrinkage characteristics into account, errors in the dimensions of the snorkel can be avoided, which could lead to substandard snorkel quality.

[0051] XPE is cross-linked polyethylene, also known as chemically cross-linked polyethylene material. It is a new type of environmentally friendly material that is non-toxic, odorless, soundproof, waterproof, heat-insulating, and heat-preserving. It does not pollute the atmosphere when burned, has good resilience, and its hardness and thickness can be adjusted at will. It is also lightweight and can be thermoformed or produced in flame-retardant form. It is suitable for sports protective gear, handbags and luggage, automobiles, aerospace, construction, footwear, toys, air conditioning, and oil pipeline insulation. Its material shrinkage characteristics are 2% to 4%, which can be measured according to the ASTM D955 method.

[0052] PE stands for polyethylene, a thermoplastic resin obtained by polymerizing ethylene. Industrially, it also includes copolymers of ethylene with small amounts of α-olefins. Polyethylene is odorless, non-toxic, and has a waxy feel. It possesses excellent low-temperature resistance (minimum service temperature can reach -100 to -70℃), good chemical stability, and is resistant to most acids and alkalis (except oxidizing acids). It is insoluble in common solvents at room temperature, has low water absorption, excellent electrical insulation, and its shrinkage characteristics are 2%–3%, which can be measured according to ASTM D955.

[0053] Water hose materials are not limited to XLPE, XPE, PE, etc., but can also be other plastic materials.

[0054] The clearance requirements for the installation points are the assembly requirements between the snorkel and the car, including the size requirements of the car's A-pillar and fenders, as well as the fitting requirements between the snorkel and the car's A-pillar and fenders.

[0055] In some embodiments, the constraint positions for the snorkel are the A-pillar mounting points and / or the fender mounting points and / or the fender mounting surfaces and / or the A-pillar mounting surfaces.

[0056] Specifically, the A-pillar mounting point and the fender mounting point are on the same plane, and the fender mounting surface and the A-pillar mounting surface are on the same plane, and the two are opposite sides.

[0057] The constraint positions for the snorkel are the A-pillar mounting points and / or fender mounting points. This is to improve the installation accuracy when the snorkel is installed at the A-pillar mounting points and / or fender mounting points, and to avoid the problem of installation failure due to size mismatch.

[0058] When the snorkel is constrained at the fender mounting surface and / or A-pillar mounting surface, it is to improve the fit between the snorkel surface and the A-pillar mounting surface and / or fender mounting surface of the car, and to avoid problems with poor fit.

[0059] In this experiment, the temperature change of the wading nozzle under cooling conditions over time was referenced. Figure 1 As shown, the temperature range is 260℃ (rotomolding temperature) to 23℃ (factory ambient temperature);

[0060] When no restraints are applied to the snorkel, under normal circumstances, the deformation of the snorkel over time will change as shown in the reference diagram. Figure 2 As shown;

[0061] There are six methods for constraining the wading hose by setting the constraint location (fully constraining the wading hose by the installation point, and surface constraining the wading hose by the surface):

[0062] Option 1: Refer to Figure 3 As shown, the constraint location is the A-pillar installation point, which is fully constrained.

[0063] The second option: Refer to Figure 4 As shown, the constraint position is a complete constraint at the fender mounting point;

[0064] The third option: Refer to Figure 5 As shown, the constraint positions are fully constrained at the A-pillar mounting point and the fender mounting point;

[0065] The fourth option: Refer to Figure 6 As shown, the constraint positions are the A-pillar mounting point and the fender mounting point, as well as the fender mounting surface constraint; where A in the figure refers to the complete constraint of the A-pillar mounting point and the fender mounting point of the snorkel, and B in the figure refers to the constraint of the fender mounting surface of the snorkel.

[0066] Fifth option: Refer to Figure 7 As shown, the constraint location is the fender mounting surface constraint;

[0067] Sixth option: Refer to Figure 8 As shown, the constraint location is the A-pillar mounting surface constraint.

[0068] Deformation analysis was conducted by setting constraints for six different schemes, and the deformation diagrams of the wading throat under the constraints of the six schemes were obtained respectively.

[0069] Reference Figure 9 As shown in the figure, this is the deformation diagram of the first scheme. It can be seen from the figure that when the A-pillar installation point is fully constrained, the deformation is mainly concentrated in the lower part of the wading nozzle, and the maximum deformation reaches 21.92mm.

[0070] Reference Figure 10 As shown in the figure, this is the deformation diagram of the second scheme. It can be seen from the figure that when the fender installation point is fully constrained, the deformation is mainly concentrated on the upper part of the snorkel, and the maximum deformation reaches 35.75mm.

[0071] Reference Figure 11 As shown in the figure, this is the deformation diagram of the third scheme. It can be seen from the figure that when the A-pillar installation point and the fender installation point are fully constrained, the position accuracy of the snorkel installation point is high, and the deformation is mainly concentrated at the bend of the snorkel and the top of the snorkel, with the maximum deformation reaching 22.78mm.

[0072] Reference Figure 12 As shown in the figure, this is the deformation diagram of the fourth scheme. It can be seen from the figure that under the condition that the A-pillar mounting point and the fender mounting point are fully constrained and the fender mounting surface is constrained, the position accuracy of the snorkel mounting point is high, and the deformation is mainly concentrated at the top of the snorkel, with a maximum deformation of 1.634mm.

[0073] Reference Figure 13 As shown, this is a deformation diagram of the fifth scheme. It can be seen from the diagram that, under the constraint of the fender mounting surface, the deformation is mainly concentrated in the upper part of the snorkel, and the maximum deformation reaches 2.311mm.

[0074] Reference Figure 14 As shown in the figure, this is the deformation diagram of the sixth scheme. It can be seen from the figure that under the constraint of the A-pillar mounting surface, the deformation is mainly concentrated in the lower part of the wading nozzle, and the maximum deformation reaches 1.873mm.

[0075] Conclusions: 1. The constraints for finalization should be controlled by surface constraints, and the control by installation points should be avoided as much as possible;

[0076] 2. The deformation of the wading hose is mainly shrinkage and warping. When using constraint conditions, it is best to control both the installation point and the surface at the same time.

[0077] 3. The shaping control time must exceed the internal cooling time of the material. (Note: Without accurate material parameters, quantitative analysis cannot be performed. Material parameters include density (g / cm³).) 3 (Including Poisson's ratio, elastic modulus (MPa), thermal conductivity (mW / mm / K), specific heat (mJ / tonne / K), surface heat transfer coefficient, temperature (°C), etc.)

[0078] Among them, reference Figure 7 and Figure 8 As shown, its Figure 7 and Figure 8 The combination of these elements constitutes the constraint on the snorkel at the fender mounting surface and the A-pillar mounting surface, and its deformation is compared to the reference... Figure 13 and Figure 14 The situation shown is even smaller.

[0079] In this embodiment, the thermal deformation analysis of the wading throat is performed using CAE analysis technology.

[0080] Specifically, CAE analysis refers to the use of computers to solve and analyze the structural mechanical properties of complex engineering projects and products, as well as the optimization analysis of product structures. The key to organically organizing the various stages of engineering (production) is integrating relevant information so that it exists throughout the entire lifecycle of the project (product). CAE software can perform static structural analysis, dynamic analysis; study linear and nonlinear problems; and analyze structures (solids), fluids, and electromagnetics.

[0081] CAE analysis can output important performance parameters such as pressure distribution, temperature, shear rate, shear stress, and speed. CAE can assist mold designers in optimizing runner systems and mold structures, help product designers improve product shapes from a process perspective, select plastics with the best molding performance, help mold manufacturers select suitable injection molding machines, and guide molding engineers in setting reasonable process conditions.

[0082] CAE technology can be widely applied to many sectors of the national economy, such as various industrial construction projects, including factory construction, and the construction of highways, railways, bridges, and tunnels; large-scale engineering projects, such as the construction of power plants, dams, reservoirs, and slipways; shipbuilding and port construction; and civil engineering projects. It can also be applied to enterprise production processes and other enterprise operation, management, and control processes, such as factory production processes and company business activities.

[0083] Based on the temperature changes in different regions and the control of cooling and part removal time, combined with the shrinkage characteristics of the wader material, the gap requirements of the installation points, and the deformation of each constraint position, this invention obtains the deformation trend of the wader through comprehensive analysis using CAE analysis technology. This allows for the advance reservation of deformation amount during the wader production stage; for example, the wader will be made shorter when the temperature is high and longer when the temperature is low.

[0084] S2: Make a shaping fixture. Based on the shape and structure of the wading hose and its deformation trend, make a shaping fixture for the wading hose and fix the selected constraint position on the shaping fixture.

[0085] Specifically, the shaping tooling is a contour tooling, which is a cavity corresponding to the shape of the snorkel. Local optimization and adjustment can be made according to actual design requirements. For example, if the gap of a certain part of the vehicle is too large, the over-shaping of that part will be increased during the shaping process.

[0086] Therefore, based on the shape and structure of the wading hose, combined with the CAE analysis results and the actual assembly effect, a corresponding shaped tooling was made for the wading hose, and the selected constraint positions were fixed on the shaped tooling.

[0087] S3: Rotational molding process, which produces waders using rotational molding technology, and the cooling and removal time is adjusted according to the ambient temperature.

[0088] In this embodiment, the rotational molding process in step S3 includes the following steps:

[0089] S3.1: Loading: Add the powdered raw material into the mold and close the mold;

[0090] S3.2: Rotational molding heating, the mold is transferred into a high-temperature processing chamber, the high-temperature processing chamber rotates and heats continuously, and the raw material in the mold is gradually coated, melted and adhered to the inner cavity of the mold under the action of centrifugal force and heat energy;

[0091] S3.3: Cooling. After heating is complete, remove the mold and cool it with a fan. Adjust the cooling and removal time according to the factory ambient temperature.

[0092] In this step, the wader is still inside the mold and is completely enclosed. The mold itself constrains the wader, and the wader is constrained by the mold to correct any deformation.

[0093] S3.4: Demolding, removing the product from the mold.

[0094] The above rotational molding process is just one example of rotational molding processes. Other related rotational molding processes can also be used, and this does not limit the scope of protection of this application.

[0095] Specifically, rotational molding is a common processing technique that can be used to mold not only small products but also large and extra-large products. Rotational molding is a pressureless process, and centrifugal force is not applied to the product. Therefore, the final product has almost no internal stress, orientation, or residual strain, except for slight shrinkage. It also avoids defects such as dents, deformation, and cracking. Furthermore, this process involves integral molding, converting almost 100% of the raw material into the finished product, with no scrap. The powdered raw material is XLPE, XPE, or PE material.

[0096] In this embodiment, when the factory ambient temperature is 16-22℃, the cooling and part removal time is 30 minutes. The time is shortened by 1 minute for every 3℃ increment of temperature change.

[0097] Specifically, cooling is used to shape the wader. The cooling and removal time is determined through experimental testing based on the materials, shapes, and actual design requirements of different waders. This allows for different cooling and removal times for the wader in different temperature ranges, effectively shaping the wader within the mold. Within the 16–22°C range, the cooling and removal time is generally 30 minutes. Outside this range, adjustments are made based on the temperature difference. Specifically, when the factory ambient temperature is below 16°C, the cooling and removal time is shortened by 1 minute for every 3°C decrease in ambient temperature; when the factory ambient temperature is above 22°C, the cooling and removal time is increased by 1 minute for every 3°C increase in ambient temperature.

[0098] The factory ambient temperature for this method is generally -15 to 45°C, and the corresponding cooling and unloading time is 20 to 36 minutes.

[0099] For example: when the factory ambient temperature is 10℃, the cooling and part-retrieving time is 28 minutes; when the factory ambient temperature is 30℃, the cooling and part-retrieving time is 33 minutes; when the factory ambient temperature is -15 to 15℃, the cooling and part-retrieving time is 20 to 29 minutes; when the factory ambient temperature is 23 to 40℃, the cooling and part-retrieving time is 31 to 36 minutes.

[0100] S4: Shaping with a shaping fixture. The wading hose is removed from the mold and placed into the shaping fixture. The wading hose is constrained by the constraint position. In combination with the deformation trend of the wading hose, pressure is applied to the surface of the wading hose to perform anti-deformation constraint and play a corrective role.

[0101] In this embodiment, during step S4, pressure is applied to the surface of the wading throat using a pressure device or sandbags.

[0102] Preferably, in this embodiment, sandbags are used to apply pressure to the deformable parts of the wading hose surface; the deformable parts can be derived from the conclusions of the above six schemes.

[0103] When the wading hose is removed from the mold, it is still hot. It will cool and shrink due to the ambient temperature and needs to be placed into the corresponding shaping fixture immediately. The wading hose is constrained by the constraint position. Combined with the deformation trend of the wading hose, pressure is applied to the surface above the wading hose by sandbags. Under the combined action of pressure and the covering force of the shaping fixture, the shape of the wading hose is corrected. Under the constraint of the fixture, the release of internal stress in the wading hose is not free, and the deformation is relatively controllable.

[0104] Reference Figure 15and Figure 16 In this embodiment, mounting brackets 1 are provided at both the A-pillar mounting point and the fender mounting point. The snorkel is mounted on the mounting bracket 1. The length direction of the snorkel is defined as the X direction, the direction perpendicular to the length of the snorkel is defined as the Y direction, and the distance between one side of the mounting bracket 1 and the mounting point at the A-pillar or fender is defined as D.

[0105] Specifically, the mounting bracket 1 is generally L-shaped, divided into a vertical part and a horizontal part. The horizontal part is connected to the bottom of the A-pillar mounting point or the fender mounting point. The vertical part has holes. The distance between the vertical part and the A-pillar mounting point or the fender mounting point is set as D.

[0106] In this embodiment, when the ambient temperature is -10 to 35°C, there is a variation of ±4mm in the X direction, ±3mm in the Y direction, and ±3mm in the distance D.

[0107] Specifically, the above data were obtained through high and low temperature experiments and CAE analysis;

[0108] Specifically, in this embodiment, the A-pillar mounting point and mounting bracket 1 on the A-pillar are taken as an example:

[0109] The X-direction mainly affects the length of the snorkel, which is influenced by both ambient temperature and the rotational molding process (powdered materials are stacked under centrifugal force, and the micro-particles are not dense). It is evident that the thermal expansion and contraction of the snorkel is very significant.

[0110] Specifically, experiments showed that when the ambient temperature was -10 to 16℃, the change in the X direction was -4 to 0 mm; when the ambient temperature was 16 to 22℃, the change in the X direction was 0; and when the ambient temperature was 23 to 35℃, the change in the X direction was 0 to 4 mm.

[0111] The Y-direction mainly affects the fit between the snorkel surface and the A-pillar mounting surface and the fender mounting surface. Without deformation, the fit between the snorkel surface and the A-pillar mounting point or the fender mounting point is 0. Deformation of the snorkel will cause a bulge, which is affected by the ambient temperature.

[0112] Specifically, experiments showed that when the ambient temperature was -10 to 16℃, the change in the Y direction was -3 to 0 mm; when the ambient temperature was 16 to 22℃, the change in the Y direction was 0; and when the ambient temperature was 23 to 35℃, the change in the Y direction was 0 to 3 mm.

[0113] The distance D mainly affects the shape of the snorkel, which is affected by both the ambient temperature and the constraints of the shaping fixture. For example, the shape of the snorkel may cause the internal microparticles to expand after being heated, requiring the release of internal stress. Since the air inlet of the snorkel is a free end, it may tilt upwards.

[0114] Specifically, experiments showed that the change in distance D was -3 to 0 mm when the ambient temperature was -10 to 16℃, 0 mm when the ambient temperature was 16 to 22℃, and 0 to 3 mm when the ambient temperature was 23 to 35℃.

[0115] A rotationally molded wading hose, manufactured by the deformation control method of the wading hose described in any one of the above claims.

[0116] In summary, this invention, by considering ambient temperature, the shrinkage characteristics of the snorkel material, and the clearance requirements of the installation points, selects installation points at the A-pillar and fender locations, and / or the fender mounting surface, to constrain the snorkel. CAE analysis of the snorkel's thermal deformation is performed to determine its deformation trend. Pre-fabricated tooling conforming to the snorkel's external shape is then manufactured. During snorkel production, allowance is made for pre-emptive deformation to reduce deformation caused by thermal expansion and contraction and internal stress due to ambient temperature and manufacturing processes. Cooling is achieved by adjusting the ambient temperature. During the cooling process, the wader is kept inside the mold, constrained by the mold to correct deformation. The wader is then removed from the mold and placed into the corresponding shaping fixture. Constraints are applied to the wader's surface using sandbags, based on its deformation trend, to counteract deformation and control deformation. This invention allows for pre-planning of deformation based on ambient temperature and wader structure, ensuring proper assembly. Using this deformation control method, the wader's pass rate has increased from 35% to 90%.

[0117] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0118] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions also fall within the scope of protection of the present invention.

Claims

1. A method for controlling the deformation of a wading hose, characterized in that, Includes the following steps: S1: Predict the deformation trend. Based on the ambient temperature, combined with the shrinkage characteristics of the wading hose material and the gap requirements of the installation points, select the constraint positions to constrain the wading hose, and analyze the thermal deformation of the wading hose to obtain the deformation trend of the wading hose. The ambient temperature includes natural ambient temperature and factory ambient temperature. Natural ambient temperature refers to the temperature at the production site and the installation site, while factory ambient temperature refers to the temperature inside the rotational molding factory. The constraint positions for the snorkel are the A-pillar mounting point and / or the fender mounting point and / or the fender mounting surface and / or the A-pillar mounting surface; S2: Make a shaping fixture. Based on the shape and structure of the wading hose and its deformation trend, make a shaping fixture for the wading hose and fix the selected constraint position on the shaping fixture. S3: Rotational molding process, which produces waders using rotational molding technology, and the cooling and removal time is adjusted according to the factory ambient temperature. When the factory ambient temperature is 16-22℃, the cooling and part removal time is 30 minutes. The time is reduced by 1 minute for every 3℃ increase in temperature. S4: Shaping with a shaping fixture. The wading hose is removed from the mold and placed into the shaping fixture. The wading hose is constrained by the constraint position. In combination with the deformation trend of the wading hose, pressure is applied to the surface of the wading hose to perform anti-deformation constraint and play a corrective role.

2. The deformation control method for wading hoses according to claim 1, characterized in that, The thermal deformation analysis of the wading throat was performed using CAE analysis technology.

3. The deformation control method for wading hoses according to claim 1, characterized in that, The rotational molding process in S3 includes the following steps: S3.1: Loading: Add the powdered raw material into the mold and close the mold; S3.2: Rotational molding heating, the mold is transferred into a high-temperature processing chamber, the high-temperature processing chamber rotates and heats continuously, and the raw material in the mold is gradually coated, melted and adhered to the inner cavity of the mold under the action of centrifugal force and heat energy; S3.3: Cooling. After heating is complete, remove the mold and cool it with a fan. Adjust the cooling and removal time according to the factory ambient temperature. S3.4: Demolding, removing the product from the mold.

4. The deformation control method for wading hoses according to claim 1, characterized in that, In step S4, pressure is applied to the surface of the wading throat using a pressure device or sandbags.

5. The deformation control method for wading hoses according to claim 1, characterized in that, Mounting brackets (1) are provided at the mounting points of the A-pillar and the fender. The snorkel is installed on the mounting brackets (1). The length direction of the snorkel is taken as the X direction, the direction perpendicular to the length of the snorkel is taken as the Y direction, and the distance between one side of the mounting bracket (1) and the mounting point at the A-pillar or the fender is taken as D.

6. The deformation control method for a wading hose according to claim 5, characterized in that, When the ambient temperature is -10 to 35°C, there is a variation of ±4mm in the X direction, ±3mm in the Y direction, and ±3mm in the distance D.

7. A rotationally molded wading hose, characterized in that, A wading hood manufactured using the deformation control method of any one of claims 1-6.

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