Bionic hot stamping shape follow-up water channel based on ginkgo leaf vein characteristics

Abstract

The invention relates to 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 distances from a water channel center line contained in the conformal water channel to the surface of a product are equal everywhere, the water channel comprises a main water channel and branch water channels, the main water channel penetrates through a cooling area of the hot stamping die, and the branch water channels penetrate through a cooling area of the hot stamping die. A primary branch water way is divided from a main water way, a next-stage branch water way is divided from the primary branch water way, each main water way and the branch water ways divided from the main water way are arranged in a radial shape, the included angle between every two adjacent branch water ways is a bifurcation angle, and the bifurcation angle is 10-40 degrees, so that the multi-stage branch water way is suitable for complex shapes and meets the actual cooling requirements. And a new way is provided for solving the problems of mold surface hot spot concentration, low cooling efficiency and the like.

Description

Technical Field

[0001] The invention relates to the technical field of hot stamping dies, and in particular to a bionic hot stamping conformable water channel based on ginkgo leaf vein characteristics. Background Art

[0002] High-strength steel plate hot stamping forming technology can ensure automobile safety and comfort while achieving automobile lightweight, and has now become an important means of automobile processing and manufacturing. The cooling capacity of the internal cooling system of the hot stamping die is the key to determining the quality of product forming, and the structural design and performance analysis of the system has become a research hotspot. As an indispensable component of the cooling system, optimizing the cooling water channel structure is the main way to improve the performance of the cooling system. Traditional cooling water channels are usually linear, with low heat exchange efficiency, which leads to local hot spots on the die surface, making it difficult to meet the needs of efficient cooling, and the water channel structure and layout are mostly single. In contrast, conformal cooling water channels can achieve more efficient cooling. This type of water channel refers to the distance from the center line of the cooling water channel to the die surface being equal everywhere. The cooling effect of conformal cooling water channels mainly depends on the heat exchange efficiency between the cooling water channel and the mold, which is closely related to the coverage area and structural parameters of the cooling water channel. The design focus of conformal water channels is on changing the layout or structural parameters. For example, the Chinese papers "Research on the Cooling System of Hot Stamping Dies for B-pillar Reinforcement Based on Performance Gradient Distribution" and "Research on the Design and Manufacturing of Conformal Water Channels for Hot Stamping Dies Based on Numerical Simulation and 3D Printing" optimize the cooling effect by improving the layout of conformal cooling water channels. Chinese patent CN108746374B discloses a method for preparing hot stamping die inserts with conformal cooling water channels. The improvement of cooling water channel parameters increases the cooling efficiency to a certain extent, but does not improve the hot spot concentration phenomenon. Summary of the invention

[0003] The purpose of the present invention is to provide a bionic hot stamping conformal water channel based on the characteristics of ginkgo leaf veins. It is designed by combining the principles of bionics to study the similarity between the surface morphology of hot stamping molds and biological structures. It can adapt to complex shapes and meet actual cooling needs, and provides a new way to solve the problems of hot spot concentration on the mold surface and low cooling efficiency.

[0004] The purpose of the present invention is achieved through the following technical solutions: A bionic hot stamping conformable water channel based on the characteristics of ginkgo leaf veins. The conformable water channel is arranged in a hot stamping mold. The distance from the center line of the water channel included in the conformable water channel to the product surface is equal everywhere. The water channel includes a main water channel and a branch water channel. The main water channel runs through the cooling area of ​​the hot stamping mold. A 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 the multiple branch water channels branched from it are arranged radially. The angle between the main water channel and the first-level branch water channel is a bifurcation angle, and the angle between two adjacent branch water channels is a bifurcation angle. The bifurcation angle is 10-40 degrees.

[0005] As a more optimal technical solution of the present invention, the area in the hot stamping die where the center line of the cooling water channel is parallel to the tangent line of the die surface is a linear cooling water channel, and other areas are arranged with the bionic hot stamping conformal water channel.

[0006] As a more optimal technical solution of the present invention, the center distance between adjacent water channels is 10-20 mm.

[0007] As a more optimal technical solution of the present invention, the diameter of the water channel is 8-20 mm.

[0008] As a more preferred technical solution of the present invention, the distance between the center of the cooling water channel of the water channel and the mold surface is 10-20mm. The distance between the center of the cooling water channel of the water channel and the mold surface is 10-20mm.

[0009] The beneficial effects are as follows: The bionic hot stamping conformal water channel provided by the present invention introduces the ginkgo leaf vein structure into the structural design of the hot stamping cooling water channel, and has a main water channel and multi-level branch water channels separated from the main water channel, and a reasonably distributed and optimized flow path, which ensures the uniformity and efficiency of mold cooling. Under the premise of maintaining the original cooling effect, the hot stamping mold effectively solves the problem of local hot spots caused by the mold surface shape being too complex to arrange water channels. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more clear and easy to understand. In the accompanying drawings: Figure 1 This is a schematic diagram of the bionic hot stamping conformal water channel structure of the present invention, wherein figures a, b, and c are views from different angles.

[0011] Figure 2 These are reference diagrams for the bionic hot stamping conformal waterway design process of the present invention, wherein Figure a is a ginkgo leaf, Figure b is a ginkgo leaf vein, and Figure c is one of the ginkgo leaf veins.

[0012] Figure 3 This is a schematic diagram of the area of ​​the bionic hot stamping conformal water channel on the mold of the present invention, wherein figures a and b are views from different angles.

[0013] Figure 4 This is a schematic diagram of the structural parameters of the bionic hot stamping conformal water channel of the present invention, wherein a is a side view of the mold and b is a top view of the mold.

[0014] Figure 5 This is a schematic diagram of the bifurcation angle parameters of the bionic hot stamping conformal water channel of the present invention, wherein the dark red line is the main water channel, the light red line is the primary branch water channel, the black line is the secondary branch water channel, and the black dotted line is the mold surface.

[0015] Figure 6 This is a comparison chart of the cooling capacity of the present invention and other structures. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0017] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0018] The present invention provides a bionic hot stamping conformable water channel, which is designed based on the veins of the ginkgo leaf. As channels for transporting photosynthetic products and inorganic substances, the veins play a vital role in the photosynthetic efficiency of plants, maintaining temperature stability, and plant growth and development. Due to the unique physiological structure of the veins, the flow state of the medium therein is improved, and good heat dissipation and heat transfer capabilities are exhibited, so that a bionic structure with similar design functions can be obtained. The veins of the ginkgo leaf are forked, and its main feature is that at the base of the leaf, the main vein is divided into several thicker secondary veins, and these two veins extend outward and are distributed in a fork shape, forming a characteristic vein structure, such as Figure 2 (a) As shown in the figure, the main vein is the main supporting structure of the leaf veins, which runs through the entire leaf veins and extends from the base of the leaf to the tip of the leaf. The secondary veins branch out from the main veins and are arranged radially with the main veins, supporting and transporting nutrients to various parts of the leaf veins, such as Figure 2(b) Secondary veins usually fork and connect to each other to form a complex structure. The angle between adjacent secondary veins is the bifurcation angle. The size of the bifurcation angle affects the working efficiency of the leaf veins. This bifurcated connection method can more effectively distribute the nutrients and water transported by the main veins, thereby ensuring the normal operation of growth metabolism. Figure 2 (c) As shown. The present invention is a bionic hot stamping conformable water channel derived from the structure of the veins of the ginkgo leaf. Specifically, the conformable water channel is arranged in the hot stamping mold. The distance from the center line of the water channel included in the conformable water channel to the surface of the product is equal everywhere. The water channel includes a main water channel and a branch water channel. The main water channel runs through the cooling area of ​​the hot stamping mold. A first-level branch water channel is separated from the main water channel, and the next-level branch water channel is separated from the first-level branch water channel. Each main water channel and the multi-level branch water channels separated from it are arranged radially. The angle between two adjacent branch water channels is the bifurcation angle, and the bifurcation angle is 10-40 degrees. The bionic hot stamping conformable water channel can be processed by 3D printing to achieve shape fitting.

[0019] Example 1 See also Figure 1 As shown, the present invention provides a bionic hot stamping conformal water channel based on the characteristics of ginkgo leaf veins. The structure simulates the distribution characteristics of ginkgo leaf veins, and includes a main water channel, secondary branches and optimized bifurcation angles. The main water channel serves as the main cooling channel, running through the cooling area of ​​the hot stamping mold, while the branch water channel extends from the main water channel, and the branch water channel also divides into secondary branch water channels. Each main water channel and the multi-level branch water channels divided from it are radially distributed to expand the cooling coverage. The bifurcation angle of the present invention, while ensuring the rigidity of the mold, allows the coolant to flow smoothly in the water channel, reduces flow resistance, and thus improves cooling efficiency. The specific design steps are as follows: Figure 1 The first die surface 1 shown is the inlet of the cooling water flow, and the second die surface (opposite to the first die surface) establishes a water path for the outlet of the cooling water flow.

[0020] Figure 1 The third die surface 3, the fourth die surface 4, the fifth die surface 5 and the sixth die surface 6 are shown as areas where the main water channel that runs through the cooling area of ​​the entire hot stamping die and the secondary branch water channels are divided from the main water channel, referring to the vein structure of the ginkgo leaf to meet the cooling needs of different areas of the die. The introduction of the bionic hot stamping conformal water channel forms a cooling coverage without blind spots, effectively alleviating the generation of local hot spots.

[0021] Figure 5 The figure in the figure is a schematic diagram of the parameters of the bifurcation angles of the secondary branch waterways divided from the main waterway, and Table 1 lists in detail the angle selection examples of the bifurcation angles in the third die surface 3, the fourth die surface 4, the fifth die surface 5 and the sixth die surface 6. The bifurcation angle of 10-40 degrees ensures that the coolant in each branch is evenly distributed, thereby improving the overall cooling efficiency.

[0022] The bionic hot stamping conformal water channel structure based on the ginkgo leaf characteristics established through the above steps has a reasonable distribution of primary and secondary water channels and an optimized flow path, ensuring the uniformity and efficiency of mold cooling. The structure with different bionic parameters obtained through bionics achieves the purpose of improving the cooling capacity of the hot stamping mold. At the same time, since the bionic design is only concentrated on the temperature, the processing efficiency is high and the cost is reduced.

[0023] Table 1 See also Figure 4 , the specific parameters of the bionic hot stamping conformal water channel structure are characterized: R=8mm, A=16.5mm, H=16mm; R is the cooling channel diameter, A is the center distance between adjacent cooling channels, H is the distance between the cooling channel center and the die surface, and the die area is 103383.06mm². The above parameters are selected based on actual working conditions.

[0024] Temperature field is an important indicator to measure cooling capacity. Therefore, the temperature field distribution experiment is as follows: See also Figure 6 The bionic conformable waterway of the present invention ( Figure 6 a) The temperature distribution is significantly more uniform than that of conventional conformal water channels ( Figure 6 b) The concentration of high-temperature areas is effectively improved. With its high flow rate and uniformity, the bionic hot stamping conformal water channel can quickly conduct and dissipate the heat on the mold surface, allowing the local overheated area to cool down quickly. This allows the bionic hot stamping conformal water channel to effectively reduce the formation of local hot spots. The water channel parameters of 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 is also the same.

[0025] The conformal water channel of the present invention, which is characterized by bionic ginkgo leaf veins, increases the flow rate of the coolant in the hot spot area, thereby improving the heat transfer efficiency and further reducing the frequency and intensity of the hot spot generation.

[0026] Average temperature is an important indicator for measuring cooling capacity, which further verifies the advantages of bionic conformal water channels. Therefore, the average temperature comparison experiment is conducted as follows: It can be seen from Table 2 that the average temperature of the hot stamping die of the bionic conformable water channel is 115.3°C, the average temperature of the conformable water channel is reduced by 7.2% compared with the linear cooling water channel, and the average temperature of the bionic conformable water channel is reduced by 11.1% compared with the linear cooling water channel, indicating that the average temperature of the hot stamping die of the bionic conformable water channel of the present invention is better than that of the linear cooling water channel and the conformable water channel.

[0027] Therefore, by arranging bionic conformal water channels in individual areas of the hot stamping die, the cooling water channel arrangement density of the die is made uniform, and at the same time, the bionic conformal water channels improve the flow rate and flow uniformity. Individual areas refer to areas other than the area where the center line of the cooling water channel is parallel to the tangent line of the die surface. The water channel arrangement method with uniform density of bionic conformal water channels effectively improves the temperature distribution characteristics of the die, improves the cooling capacity of the cooling water channel, and enhances the cooling effect. Conformal water channels are those in which the distance from the center line of the water channel to the surface of the product is equal everywhere and do not contain branch water channels. The water channel parameters of linear cooling water channels, bionic conformal water channels, and traditional conformal water channels are all R=8mm, A=16.5mm, H=16mm, and the number of water channels and other parameters are also the same.

[0028] Table 2 Average temperature (℃) Compared with the linear reduction rate (%) Straight 129.7 0 Follow the shape 120.36 7.2 Bionic Shape 115.3 11.1 In other embodiments, the center distance between adjacent water channels may be selected to be 10-20 mm.

[0029] In other embodiments, the diameter of the water channel can be selected to be 8-20 mm.

[0030] In other embodiments, the distance between the center of the cooling water channel of the water channel and the mold surface can be selected to be 10-20 mm.

[0031] 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 proposed in the present invention follows the bionic design concept and draws inspiration from nature. It has been verified that the cooling water channel structure can enable the hot stamping die to have good cooling efficiency, while meeting the requirement of uniform cooling water channel layout density, effectively extending the service life of the die, improving production efficiency, and reducing production costs, providing a new technical solution for the design of hot stamping die cooling system.

[0032] The present invention optimizes the cooling water channel of the existing hot stamping die, which can not only achieve the basic requirement of hot stamping die cooling to ensure heat dissipation efficiency, but also reduce die wear, thereby extending the service life of the die and reducing production costs. The contact area between the water channel and the die is increased, the heat dissipation efficiency is improved, and at the same time, the bionic design of the water channel structure realizes full coverage of the water channel inside the die, while ensuring that the density of the water channels everywhere is equal, reducing the concentration of local hot spots and improving cooling uniformity.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0034] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A bionic hot stamping conformal water channel based on the vein characteristics of ginkgo leaves, characterized by: The conformal water channel is arranged in the hot stamping die, and the distance from the center line of the water channel included in the conformal water channel to the product surface is equal everywhere. The water channel includes a main water channel and a branch water channel. The main water channel runs through the cooling area of ​​the hot stamping die. A 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 the multiple branch water channels branched from it 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.

2. The bionic hot stamping conformable water channel based on the vein characteristics of ginkgo leaves as claimed in claim 1, characterized in that: The area in the hot stamping die where the center line of the cooling water channel is parallel to the tangent line of the die surface is a linear cooling water channel, and the other areas are arranged with the bionic hot stamping conformal water channel.

3. The bionic hot stamping conformable water channel based on the vein characteristics of ginkgo leaves as claimed in claim 1, characterized in that: The center distance between adjacent water channels is 10-20mm.

4. The bionic hot stamping conformable water channel based on the vein characteristics of ginkgo leaves as claimed in claim 1, characterized in that: The diameter of the water channel is 8-20 mm.

5. The bionic hot stamping conformable water channel based on the vein characteristics of ginkgo leaves as claimed in claim 1, characterized in that: The distance between the center of the cooling water channel of the water channel and the mold surface is 10-20 mm.

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