Bionic hot stamping conformal water channel based on ginkgo biloba leaf vein characteristics

Abstract

The present application relates to a kind of bionic hot stamping conformal waterway based on ginkgo biloba leaf vein feature, the conformal waterway is arranged in hot stamping die, conformal waterway includes waterway center line to product surface distance everywhere is equal, the waterway includes main waterway and branch waterway, main waterway is through the cooling area of hot stamping die, from main waterway branch out first level branch waterway, from first level branch waterway again branch out next level branch waterway, each main waterway and its branch out multistage branch waterway are radially arranged, the included angle between adjacent two levels branch waterway is bifurcation angle, the bifurcation angle is 10-40 degrees, adapt to complex shape, comply with actual cooling demand, to solve the new way that is provided for the problems such as die surface hotspot concentration, low cooling efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot stamping die, and particularly relates to a bionic hot stamping conformal water channel based on ginkgo leaf vein characteristics. BACKGROUND

[0002] The hot stamping forming technology of high-strength steel plate can ensure the safety and comfort of automobiles while realizing the lightweight of automobiles, and has become an important means in automobile processing and manufacturing industry. The cooling capacity of the internal cooling system of the hot stamping die is the key to determine the forming quality of the product, and the structural design and performance analysis of the system have become a research hotspot. As an indispensable part of the cooling system, optimizing the structure of the cooling water channel is the main way to improve the performance of the cooling system. The traditional cooling water channel is usually linear, and its heat exchange efficiency is low, which leads to the easy generation of local hot spots on the die surface, and it is difficult to meet the demand of efficient cooling, and the structure and layout of the water channel are mostly single. In contrast, the conformal cooling water channel can achieve more efficient cooling, and the center line of the cooling water channel is equal to the distance from the die surface. The cooling effect of the conformal cooling water channel mainly depends on the heat exchange efficiency between the cooling water channel and the die, which is closely related to the coverage area and structural parameters of the cooling water channel. The design focus of the conformal water channel is concentrated on changing the layout or structural parameters, such as the Chinese papers 'Research on Cooling System of Hot Stamping Die for B-pillar Reinforcement Based on Performance Gradient Distribution' and 'Design and Manufacturing Research of Hot Stamping Die Conformal Water Channel Based on Numerical Simulation and 3D Printing'. The two papers optimize the cooling effect by improving the layout of the conformal cooling water channel. The Chinese patent CN108746374B discloses a preparation method of a hot stamping die insert with a conformal cooling water channel. The improvement of the cooling water channel parameters to some extent increases the cooling efficiency, but the phenomenon of hot spot concentration has not been improved. SUMMARY

[0003] The purpose of the present application is to provide a bionic hot stamping conformal water channel based on ginkgo leaf vein characteristics, which is designed by combining the similarity of the surface morphology of the hot stamping die and the biological structure based on the principle of bionics, and is suitable for complex shapes and actual cooling needs, thereby providing a new way to solve the problems of hot spot concentration on the die surface and low cooling efficiency.

[0004] The purpose of the present application is achieved by the following technical solutions:

[0005] A bionic hot stamping conformal water channel based on ginkgo leaf vein characteristics, the conformal water channel is arranged in a hot stamping die, the water channel center line to the product surface distance is equal everywhere, the water channel includes a main water channel and a branch water channel, the main water channel penetrates through the cooling area of the hot stamping die, a first branch water channel is branched from the main water channel, and a next level branch water channel is branched from the first branch water channel, each main water channel and the multi-level branch water channel branched therefrom are arranged radially, the included angle between the main water channel and the first branch water channel is a bifurcation angle, and the included angle between adjacent two levels of branch water channels is a bifurcation angle, and the bifurcation angle is 10-40 degrees.

[0006] As a more preferred technical solution of the present application, the area in the hot stamping die where the cooling water channel center line is parallel to the tangent of the die surface is a straight line type cooling water channel, and other areas are arranged with the bionic hot stamping conformal water channel.

[0007] As a more preferred technical solution of the present application, the center distance of adjacent water channels is 10-20 mm.

[0008] As a more preferred technical solution of the present application, the diameter of the water channel is 8-20 mm.

[0009] As a more preferred technical solution of the present application, the distance between the cooling water channel center of the water channel and the die surface is 10-20 mm.

[0010] The beneficial effects are as follows:

[0011] The bionic hot stamping conformal water channel provided by the present application introduces the structure of ginkgo leaf veins into the structural design of hot stamping cooling water channels, has a main water channel and multi-level branch water channels branched from the main water channel, a reasonable distribution and optimized flow path, ensures the uniformity and efficiency of die cooling, and effectively solves the problem of local hot spots caused by the fact that the die surface shape is too complex to arrange water channels under the premise of maintaining the original cooling effect. BRIEF DESCRIPTION OF DRAWINGS

[0012] Other purposes and results of the present application will be more apparent and easy to understand through the following description in combination with the drawings and with a more comprehensive understanding of the present application. In the drawings:

[0013] Figure 1 The figure is a schematic diagram of the bionic hot stamping conformal water channel structure of the present application, wherein a, b and c are different angle views.

[0014] Figure 2 The figure is a design process reference diagram of the bionic hot stamping conformal water channel of the present application, wherein a is a ginkgo leaf, b is a ginkgo leaf vein, and c is one of the ginkgo leaf veins.

[0015] Figure 3Figure 1 is a schematic diagram of the area of the mold for the bionic hot stamping conformal water channel of the present application, wherein a and b are different angle views.

[0016] Figure 4 Figure 2 is a schematic diagram of the structural parameters of the bionic hot stamping conformal water channel of the present application, wherein a is a side view of the mold and b is a top view of the mold.

[0017] Figure 5 Figure 3 is a schematic diagram of the bifurcation angle parameters of the bionic hot stamping conformal water channel of the present application, wherein the dark red lines are the main water path, the light red lines are the first-level branch water path, the black lines are the second-level branch water path, and the black dotted lines are the mold surface.

[0018] Figure 6 Figure 4 is a comparison chart of the cooling capacity of the present application and other structures. DETAILED DESCRIPTION

[0019] In order to make the objects, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0020] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity and clarity, the description of the specific examples in the following text is described. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to the numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and in itself does not indicate the relationship between the various embodiments and / or settings being discussed.

[0021] The present application provides a bionic hot stamping conformal water channel based on the design of ginkgo leaf veins. Leaf veins serve as channels for transporting photosynthetic products and inorganic substances, and play a crucial role in the efficiency of photosynthesis, temperature stability, and plant growth and development. Due to the unique physiological structure of the leaf veins, the flow state of the medium in them is improved, showing good heat dissipation and heat transfer capacity, and a similar bionic structure can be designed. The ginkgo leaf veins are forked, and their main feature is that at the base of the leaf, the main vein divides into several thicker secondary veins, which extend outward and are distributed in a forked manner, forming a characteristic vein structure, as shown in Figure 2 (a). The main vein serves as the main support structure of the vein, extending through the entire vein from the base of the leaf to the tip of the leaf. The secondary veins branch off from the main vein and are arranged radially, supporting and transporting nutrients to various parts of the vein, as shown in Figure 2(b) shows. The secondary veins usually branch and connect with each other, forming a complex structure, the angle between adjacent secondary veins is the branching angle, the size of the branching angle affects the working efficiency of the vein, this branching connection mode can more effectively distribute the nutrients and water transported by the primary vein, so as to ensure the normal operation of growth metabolism, such as Figure 2 (c) shows. The present application is a kind of bionic hot stamping conformal water channel derived from the structure of ginkgo biloba vein, specifically, the conformal water channel is arranged in the hot stamping die, the center line of the water channel to the product surface distance is equal everywhere, the water channel includes main water channel and branch water channel, the main water channel penetrates the cooling area of the hot stamping die, the first level branch water channel is branched from the main water channel, and the next level branch water channel is branched from the first level branch water channel, each main water channel and its branched multi-level branch water channel are arranged in a radial manner, the angle between adjacent two levels of branch water channel is the branching angle, and the branching angle is 10-40 degrees. The bionic hot stamping conformal water channel can be processed by 3D printing, and shape fitting can be realized.

[0022] Example 1

[0023] Referring to Figure 1 (b) shows, the present application provides a bionic hot stamping conformal water channel based on the characteristics of ginkgo biloba vein. The structure simulates the distribution characteristics of ginkgo biloba vein, including main water channel and secondary branch and optimized branching angle. The main water channel serves as the main cooling channel and penetrates the cooling area of the hot stamping die, while the branch water channel extends from the main water channel, and the branch water channel further branches into secondary branch water channels. Each main water channel and its branched multi-level branch water channel is distributed in a radial manner to expand the cooling coverage. The branching angle of the present application ensures the rigidity of the die, and makes the cooling liquid flow smoothly in the water channel, reduces the flow resistance, and thus improves the cooling efficiency. The specific design steps are as follows:

[0024] Figure 1 The first die surface 1 shown in (a) is the inlet of the cooling water flow, and the second die surface (opposite to the first die surface) is the outlet of the cooling water flow to establish the water channel.

[0025] Figure 1 The third die surface 3, the fourth die surface 4, the fifth die surface 5 and the sixth die surface 6 shown in (b) are arranged with main water channels and secondary branch water channels branched from the main water channels in the cooling area throughout the hot stamping die, and refer to the structure of ginkgo biloba vein to meet the cooling needs of different areas of the die. By introducing the bionic hot stamping conformal water channel, a blind area-free cooling coverage is formed, effectively relieving the generation of local hot spots.

[0026] Figure 5The parameter diagram of the bifurcation angle of the main waterway branching into each secondary branch waterway is shown in Table 1, and Table 1 lists the bifurcation angle selection examples in the third mold surface 3, the fourth mold surface 4, the fifth mold surface 5 and the sixth mold surface 6. The bifurcation angle of 10-40 degrees ensures the uniform distribution of the cooling liquid in each branch, and improves the overall cooling efficiency.

[0027] The bionic hot stamping conformal waterway structure based on the characteristics of ginkgo leaves established by the above steps has a reasonable distribution of main and secondary waterways and an optimized flow path, which ensures the uniformity and efficiency of mold cooling. The structure with different bionic parameters obtained by bionics achieves the purpose of improving the cooling capacity of the hot stamping mold. At the same time, since only the temperature concentration is designed by bionics, the processing efficiency is high and the cost is reduced.

[0028] Table 1

[0029]

[0030] Referring to Figure 4 , specific parameters of the bionic hot stamping conformal waterway structure are adopted: R=8mm, A=16.5mm, H=16mm; R is the diameter of the cooling waterway, A is the center distance of adjacent cooling waterways, H is the distance between the center of the cooling waterway and the mold surface, and the mold area is 103383.06mm². The above parameters are selected based on the actual working condition.

[0031] The temperature field is an important indicator to measure the cooling capacity. Therefore, the temperature field distribution experiment is as follows:

[0032] Referring to Figure 6 , the bionic conformal waterway of the application ( Figure 6 a) shows significant uniformity in temperature distribution, compared with the traditional conformal waterway ( Figure 6 b), the concentration phenomenon of the high temperature area is effectively improved. The bionic hot stamping conformal waterway can quickly conduct and dissipate the heat on the surface of the mold due to its large flow rate and flow uniformity, so that the local overheated area can be quickly cooled. The bionic hot stamping conformal waterway can effectively reduce the formation of local hot spots. The waterway parameters of the bionic conformal waterway and the traditional conformal waterway are R=8mm, A=16.5mm, H=16mm, and the number of waterways is the same.

[0033] The bionic conformal waterway of the application based on the characteristics of ginkgo leaves increases the flow rate of the cooling liquid in the hot spot area, thereby improving the heat transfer efficiency and reducing the frequency and intensity of the hot spot.

[0034] The average temperature is an important indicator to measure the cooling capacity, which further verifies the advantages of the bionic conformal waterway. Therefore, the average temperature comparison experiment is as follows:

[0035] From table 2, the average temperature of the hot stamping die of the bionic conformal water channel is 115.3 DEG C, and the average temperature is reduced by 7.2% compared with the linear cooling water channel, and the bionic conformal water channel is reduced by 11.1% compared with the linear cooling water channel, so that the average temperature of the hot stamping die of the bionic conformal water channel is superior to the linear cooling water channel and the conformal water channel.

[0036] Therefore, by arranging the bionic conformal water channel in the individual area of the hot stamping die, the cooling water channel arrangement density of the die is uniform, and the bionic conformal water channel improves the flow rate and flow uniformity. The individual area refers to the area other than the area in which the cooling water channel center line is parallel to the tangent of the die surface. The uniform water channel arrangement density of the bionic conformal water channel effectively improves the temperature distribution characteristics of the die, so that the cooling capacity of the cooling water channel is improved, and the cooling effect is enhanced. The conformal water channel is that the distance from the water channel center line to the product surface is equal everywhere without branch water channels. The water channel parameters of the linear cooling water channel, the bionic conformal water channel and the traditional conformal water channel are R=8mm, A=16.5mm, H=16mm, and the number of water channels and other parameters are the same.

[0037] Table 2

[0038] Average temperature (°C) Comparison with linear reduction rate (%) Linear 129.7 0 Conformal 120.36 7.2 Biomimetic conformal 115.3 11.1

[0039] In other embodiments, the center distance of the adjacent water channels can be selected to be 10-20mm.

[0040] In other embodiments, the diameter of the water channel can be selected to be 8-20mm.

[0041] In other embodiments, the distance of the cooling water channel of the water channel from the die surface can be selected to be 10-20mm.

[0042] Compared with other types of cooling water channels, the bionic hot stamping conformal cooling water channel structure based on the characteristics of ginkgo leaf veins of the application follows the design concept of bionics, gets inspiration from nature, and verifies that the cooling water channel structure form can make the hot stamping die have good cooling efficiency, meet the uniform arrangement density of the cooling water channel, effectively prolong the service life of the die, improve the production efficiency, and reduce the production cost, and provide a new technical scheme for the cooling system design of the hot stamping die.

[0043] The application optimizes the cooling water channel of the existing hot stamping die, can realize the basic requirements of hot stamping die cooling and ensure the heat dissipation efficiency, can reduce die wear, and further prolong the service life of the die and reduce the production cost. The contact area of the water channel and the die is increased, the heat dissipation efficiency is improved, the bionic design of the water channel structure realizes the full-area coverage of the die internal water channel, ensures that the water channel density is equal everywhere, reduces the concentration phenomenon of local hot spots, and improves the cooling uniformity.

[0044] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0045] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A biomimetic hot-stamped conformal waterway based on the vein characteristics of ginkgo leaves, characterized in that: The conformal water channels are arranged inside the hot stamping die. The center line of the conformal water channels is equidistant from the product surface. The water channels include main water channels and branch water channels. The main water channel runs through the cooling area of ​​the hot stamping die. First-level branch water channels branch from the main water channel, and then branch from the first-level branch water channels to the next level. Each main water channel and its multi-level branch water channels are arranged radially. The angle between the main water channel and the first-level branch water channel is the bifurcation angle, and the angle between two adjacent branch water channels is the bifurcation angle. The bifurcation angle is 10-40 degrees. The area within the hot stamping die where the center line of the cooling channel is parallel to the tangent of the die surface is a straight cooling channel, while other areas are arranged with the aforementioned biomimetic hot stamping conformal channels.

2. The biomimetic hot-stamped conformal waterway based on the vein characteristics of ginkgo leaves as described in claim 1, characterized in that: The center-to-center distance between adjacent waterways is 10-20mm.

3. The biomimetic hot-stamped conformal water channel based on the vein characteristics of ginkgo leaves as described in claim 1, characterized in that: The diameter of the water channel is 8-20mm.

4. The biomimetic hot-stamped conformal waterway based on the vein characteristics of ginkgo leaves as described in claim 1, characterized in that: The distance from the center of the cooling water channel to the mold surface is 10-20mm.

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