A double door ring thermoforming mold internal partition independent cooling system

Abstract

The present application relates to the technical field of automobile hot press forming die, in particular to a double door ring hot forming die inner partition independent cooling system, which is applied to a hot forming die with an upper die seat, a lower die seat and a forming insert, and comprises a water distribution module, the inside of the water distribution module has at least three independent chamber units corresponding to the A column area, the B column area and the C column area of the forming insert respectively, each independent chamber unit has a liquid inlet area and a liquid outlet area which are not communicated with each other and are communicated with an external cooling liquid supply device, and the areas corresponding to the A column, the B column and the C column in the forming insert are respectively provided with independent circuits. The present application sets at least three independent chamber units corresponding to the A column, the B column and the C column in the water distribution module, each chamber unit has a liquid inlet area and a liquid outlet area which are not communicated with each other, and is respectively communicated with the independent circuits of the corresponding areas in the forming insert to form multiple independent circulation circuits, so that the partition independent cooling of different areas of the double door ring is realized.

Description

Technical Field

[0001] This invention relates to the field of automotive hot pressing mold technology, and in particular to a dual-ring hot forming mold with independent zoned cooling system. Background Technology

[0002] The double-ring thermoforming technology integrates the A-pillar, B-pillar, C-pillar and sill areas into a single ring structure. The final part is obtained through a single hot stamping process. During the thermoforming process, the sheet metal heated to the austenitizing temperature (about 930°C) is formed in the mold and then rapidly cooled and quenched, transforming austenite into martensite, thereby obtaining an ultra-high strength of over 1500MPa.

[0003] However, the cooling system of existing double door ring thermoforming molds has shortcomings. Due to the large size of the door ring parts, the mechanical performance requirements of different areas vary greatly. The B-pillar, as the core protection structure for side impacts, requires ultra-high strength and extremely fast cooling speed. The C-pillar and the inner ring energy absorption area require good toughness to absorb collision energy and require a relatively gentle cooling speed. However, the existing mold cooling system usually uses a coolant of a single temperature to uniformly cool the entire mold, which cannot achieve differentiated cooling of different areas of the same part. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a system capable of independently cooling the A, B and C pillar regions of the dual door ring, so that each region obtains a cooling rate that matches its performance requirements, thereby achieving a gradient performance distribution on the same component.

[0005] Based on the above objectives, the present invention provides a dual-door ring thermoforming mold internal partitioned independent cooling system, applied to a thermoforming mold having an upper mold base, a lower mold base, and a forming insert. The system includes a water distribution module, which internally has at least three independent chamber units corresponding to the A-pillar, B-pillar, and C-pillar regions on the forming insert. Each independent chamber unit has an inlet area and an outlet area that are not interconnected but connected to an external coolant supply device. The forming insert internally has independent circuits corresponding to the A-pillar, B-pillar, and C-pillar regions, each with an inlet end connected to the inlet area of ​​the corresponding independent chamber unit and an outlet end connected to the outlet area, thereby forming an independent circulation circuit for coolant circulation, to achieve partitioned independent cooling of the A-pillar, B-pillar, and C-pillar regions.

[0006] As a preferred technical solution of the present invention, the water separation module is provided with a sealed chamber. A plurality of second partition plates are arranged in the sealed chamber along the arrangement direction of the A-pillar, B-pillar and C-pillar on the shaped insert. The sealed chamber is divided into at least three independent chamber units by the second partition plates. Each independent chamber unit is provided with a first partition plate, which divides the independent chamber unit into a liquid inlet area and a liquid outlet area.

[0007] As a preferred embodiment of the present invention, the independent chamber unit includes:

[0008] The first cooling channel inlet area and the first cooling channel outlet area correspond to the A-pillar region;

[0009] The second cooling channel inlet area and the second cooling channel outlet area correspond to the B-pillar region;

[0010] The third cooling channel inlet area and the third cooling channel outlet area correspond to the C-pillar region.

[0011] As a preferred embodiment of the present invention, each liquid inlet zone is further divided into multiple liquid inlet partitions, and each liquid outlet zone is further divided into multiple liquid outlet partitions with the same number of partitions as the corresponding liquid inlet partitions.

[0012] As a preferred embodiment of the present invention, the liquid inlet zone and the liquid outlet zone include:

[0013] The first cooling channel liquid inlet section one, the first cooling channel liquid inlet section two, and the first cooling channel liquid inlet section three constitute the first cooling channel liquid inlet area;

[0014] The first cooling channel drainage area consists of three sections: first cooling channel drainage section one, first cooling channel drainage section two, and first cooling channel drainage section three.

[0015] The second cooling channel liquid inlet section one, the second cooling channel liquid inlet section two, and the second cooling channel liquid inlet section three constitute the second cooling channel liquid inlet area;

[0016] The third cooling channel liquid inlet zone consists of three sections: third cooling channel liquid inlet section one, third cooling channel liquid inlet section two, and third cooling channel liquid inlet section three.

[0017] The third cooling channel drainage area consists of three sections: Section 1, Section 2, and Section 3.

[0018] As a preferred embodiment of the present invention, a heat exchange tube is provided in the second cooling channel drainage area, the inlet end of the heat exchange tube is connected to the third cooling channel drainage area, the outlet end of the heat exchange tube extends to the outside of the water distribution module, and the second cooling channel drainage area and the first cooling channel inlet area are connected by a conduit.

[0019] As a preferred embodiment of the present invention, one end of the conduit is connected to the drainage area of ​​the second cooling channel, and the other end is connected to at least one section of the inlet area of ​​the first cooling channel.

[0020] As a preferred embodiment of the present invention, the heat exchange tubes are arranged in an S-shape or a U-shape.

[0021] As a preferred embodiment of the present invention, the surface of the heat exchange tube is provided with fins.

[0022] As a preferred embodiment of the present invention, the arrangement of the independent loops is consistent with the contour shape of the corresponding area of ​​the forming insert.

[0023] The beneficial effects of this invention are as follows: By setting at least three independent chamber units corresponding to the A, B, and C pillars inside the water distribution module, each chamber unit has an unconnected liquid inlet and outlet area, and is connected to the independent loops of the corresponding area in the forming insert to form multiple independent circulation loops. This achieves independent cooling of different areas of the double gate ring, and different areas can be circulated with coolant at different temperatures, so that each area obtains a cooling rate that matches its performance requirements. This results in a gradient performance distribution on the same part, ensuring that the B pillar area obtains ultra-high strength to meet the side impact intrusion resistance requirements, and the C pillar area obtains good toughness to meet the energy absorption requirements. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0026] Figure 2 This is a side view of the structure of the present invention;

[0027] Figure 3 This is a top-view three-dimensional structural diagram of the present invention;

[0028] Figure 4 This is a bottom-view perspective view of the three-dimensional structure of the present invention;

[0029] Figure 5 This is a three-dimensional structural diagram of the lower mold base, lower forming insert, first cooling channel liquid inlet and supply pipe, second cooling channel liquid inlet and supply pipe and third cooling channel liquid inlet and supply pipe of the present invention.

[0030] Figure 6 This is a three-dimensional structural diagram of the lower mold base, lower forming insert, and water distribution module of the present invention;

[0031] Figure 7 This is a three-dimensional structural diagram of the lower mold base, lower forming insert, liquid inlet connector, and liquid outlet connector of the present invention.

[0032] Figure 8 This is a top view of the lower mold base and water distribution module of the present invention;

[0033] Figure 9 This is a three-dimensional structural diagram of the lower mold base and water distribution module of the present invention;

[0034] Figure 10 This is a bottom-view three-dimensional structural diagram of the lower end of the water distribution module of the present invention;

[0035] Figure 11 This is a top-view three-dimensional structural diagram of the water distribution module of the present invention;

[0036] Figure 12 This is a partial three-dimensional structural diagram of the lower forming insert of the present invention.

[0037] The diagram is labeled as follows: 1. Lower mold base; 2. Lower forming insert; 3. Upper mold base; 4. Water distribution module; 5. First cooling channel drainage area; 5.1. First cooling channel drainage section 1; 5.2. First cooling channel drainage section 2; 5.3. First cooling channel drainage section 3; 6. Second cooling channel drainage area; 7. Third cooling channel drainage area; 7.1. Third cooling channel drainage section 1; 7.2. Third cooling channel drainage section 2; 7.3. Third cooling channel drainage section 3; 8. First partition plate; 9. First cooling channel inlet area; 9.1. First cooling channel inlet section 1; 9.2. First cooling channel inlet section 2; 9.3. First cooling channel inlet section 3 ; 10. Second cooling channel liquid inlet area; 10.1. Second cooling channel liquid inlet section one; 10.2. Second cooling channel liquid inlet section two; 10.3. Second cooling channel liquid inlet section three; 11. Third cooling channel liquid inlet area; 11.1. Third cooling channel liquid inlet section one; 11.2. Third cooling channel liquid inlet section two; 11.3. Third cooling channel liquid inlet section three; 12. First cooling channel liquid inlet supply pipe; 13. Second cooling channel liquid inlet supply pipe; 14. Third cooling channel liquid inlet supply pipe; 15. Independent circuit; 16. Liquid inlet connector; 17. Liquid drain connector; 18. Heat exchange tube; 19. Fin; 20. Conduit; 21. First cooling channel liquid drain pipe; 22. Second partition plate. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0039] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] like Figure 1As shown, this invention provides a dual-door ring thermoforming mold with internal partitioned independent cooling system, applied to a thermoforming mold having an upper mold base 3, a lower mold base 1, and forming inserts. The thermoforming mold is a special mold for hot stamping of automotive dual-door rings. The upper mold base 3 is mounted on the upper slide of the press, and the lower mold base 1 is fixedly mounted on the press worktable. The forming inserts include an upper forming insert fixedly mounted on the upper mold base 3 and a lower forming insert 2 fixedly mounted on the lower mold base 1. These two inserts are arranged opposite each other, and together stamp the heated sheet metal during mold closing. During the pressure holding stage, the formed part is quenched and cooled by the coolant flowing inside the mold.

[0041] As one of the core improvements of this invention, such as Figure 3 , Figure 5 , Figure 6 and Figure 12 As shown, a water distribution module 4 is fixedly installed on the outer wall of the lower mold base 1 and / or the upper mold base 3. Preferably, the water distribution module 4 is fixedly installed on the outer wall of the lower mold base 1. The water distribution module 4 is generally a flat rectangular box structure, with its length extending along the arrangement direction of the A, B, and C pillars of the double door ring, and is fixedly installed on the side wall of the lower mold base 1 by bolts or other conventional connection methods (such as welded brackets, screw fastening, etc.). The water distribution module 4 serves as a transfer and distribution hub for coolant, used to distribute the coolant supplied by the external coolant supply equipment to each independent loop 15 within the forming insert, and to collect the coolant discharged from each loop. The external coolant supply equipment can be a conventional coolant circulation system in the art, including a coolant storage tank, a refrigeration / heating unit, a circulation pump, and corresponding control valves.

[0042] The material of the water distribution module 4 is preferably a corrosion-resistant metal, such as stainless steel or aluminum alloy. Its wall thickness is designed according to the pressure requirements and is generally controlled within the range of 5mm to 15mm. To reduce heat loss of coolant during the flow of coolant inside the water distribution module 4, an insulation layer can be provided on the outer wall of the water distribution module 4. The insulation layer material can be rubber-plastic sponge or polyurethane foam.

[0043] The external coolant supply equipment is connected to each inlet zone of the water distribution module 4 via pipelines, providing a power source for the entire cooling system. For example... Figure 5 As shown, the water distribution module 4 is connected to the first cooling channel inlet pipe 12 for the first cooling channel inlet area 9 corresponding to column A, the second cooling channel inlet pipe 13 for the second cooling channel inlet area 10 corresponding to column B, and the third cooling channel inlet pipe 14 for the third cooling channel inlet area 11 corresponding to column C. Each supply pipe is connected to the corresponding output terminal of an external coolant supply device to supply coolant at different temperatures to the corresponding area. A regulating valve and flow meter (not shown in the figure) can be installed on each supply pipe as needed to independently control the coolant flow rate of each zone.

[0044] Correspondingly, such as Figure 5 As shown, the first cooling channel drainage area 5 of the water distribution module 4 is connected to the first cooling channel drainage pipe 21, which is used to drain the coolant after heat exchange in the A column area; the drainage areas of the B column area and the C column area are also connected to corresponding drainage structures, which are used to drain the coolant after heat exchange in their respective areas. Each drainage pipe is connected to the return end of the external coolant supply equipment, so that the coolant can be recycled.

[0045] like Figure 6 As shown, the water distribution module 4 is fixedly installed on the outer side wall of the lower mold base 1, and the lower forming insert 2 is installed on the upper end face of the lower mold base 1. The water distribution module 4 is connected to the independent circuit 15 in the lower forming insert 2 through the internal cavity.

[0046] like Figure 8 , Figure 9 and Figure 11 As shown, the water distribution module 4 has a sealed chamber inside. Multiple second partition plates 22 are arranged at intervals along the arrangement direction of the A, B and C columns on the shaped insert (i.e., the length direction of the water distribution module 4). The second partition plates 22 are vertically arranged in the sealed chamber, and their periphery is sealed to the inner wall of the sealed chamber, for example by welding or integral casting with the shell of the water distribution module 4, to ensure that there is no leakage between adjacent chamber units.

[0047] The second partition plate 22, through its spacing, divides the originally complete sealed chamber into three independent chamber units arranged sequentially along its length. Each independent chamber unit corresponds to the A-pillar region, the B-pillar region, and the C-pillar region, respectively. Specifically, as shown... Figure 10 , Figure 11 As shown, the independent chamber unit includes:

[0048] The first cooling channel inlet area 9 and the first cooling channel outlet area 5 correspond to the A-pillar area;

[0049] The second cooling channel inlet area 10 and the second cooling channel outlet area 6 correspond to the B-pillar area;

[0050] The third cooling channel inlet area 11 and the third cooling channel outlet area 7 correspond to the C-pillar area.

[0051] Each set of inlet and outlet zones together forms a complete independent chamber unit inside the water distribution module 4. It is completely isolated from the chamber units of adjacent areas by the second partition plate 22, and there is no coolant exchange between them. This ensures that the coolant in each area is independent from the source and is not affected by temperature fluctuations in other areas.

[0052] Each independent chamber unit is further provided with a first partition plate 8, such as Figure 10As shown. The first partition plate 8 is disposed inside the independent chamber unit, dividing the independent chamber unit into a liquid inlet area and a liquid outlet area. The liquid inlet area and the liquid outlet area are isolated from each other and do not communicate with each other through the first partition plate 8.

[0053] Specifically, the first partition plate 8 is vertically positioned approximately in the center and upwards inside each independent chamber unit, dividing each independent chamber unit into two areas along the width of the water distribution module 4: one side is the inlet area and the other side is the outlet area. The first partition plate 8 and the housing of the water distribution module 4 are also connected by a sealed method (welding or integral casting) to ensure that there is no coolant leakage between the inlet area and the outlet area.

[0054] With the cooperation of the second partition plate 22 and the first partition plate 8, nine independent sub-chambers are formed inside the water distribution module 4 (that is, the liquid inlet area and the liquid outlet area in each independent chamber unit are each a sub-chamber). The sub-chambers are physically isolated from each other by the partition plates and are not connected to each other.

[0055] like Figure 7 As shown, taking the lower forming insert 2 installed on the lower mold base 1 as an example, the areas inside the lower forming insert 2 corresponding to the A pillar, B pillar and C pillar are respectively provided with independent circuits 15. The independent circuits 15 are coolant channels opened inside the lower forming insert 2, in which coolant flows to carry away heat.

[0056] Specifically, the lower forming insert 2 has multiple independent loops 15 inside, each loop 15 penetrating the surface of the lower forming insert 2 at both ends to form an inlet and a outlet. The inlet end is equipped with an inlet connector 16, and the outlet end is equipped with an outlet connector 17. The inlet connector 16 is connected to the corresponding area and zone of the water distribution module 4 via a pipe, and the outlet connector 17 is connected to the corresponding area and zone of the water distribution module 4 via a pipe. In this way, each independent loop 15, together with its corresponding inlet and outlet zones, forms a complete independent circulation loop, allowing coolant to circulate within it.

[0057] Taking the second cooling channel inlet area 10 and the second cooling channel outlet area 6 corresponding to the B-pillar region as an example, as follows: Figure 8 and Figure 11 As shown, the external low-temperature coolant enters the second cooling channel inlet area 10 through the second cooling channel inlet supply pipe 13, and then enters the inlet end (inlet connector 16) of the independent circuit 15 corresponding to the B-pillar area in the lower forming insert 2 through the pipeline. After the coolant flows along the independent circuit 15 and absorbs heat, it is discharged from the drain end (drain connector 17) of the independent circuit 15 and flows back to the second cooling channel drain area 6 through the pipeline, thus completing a complete cooling cycle. The working principle of other areas (A-pillar area and C-pillar area) is the same, and will not be described again here.

[0058] Preferably, such as Figure 12 As shown, the independent circuits 15 are arranged in a U-shape, and their arrangement direction is consistent with the contour shape of the corresponding area of ​​the lower forming insert 2 to ensure that the distance from each point on the mold surface to the independent circuits 15 is uniform, thereby achieving uniform cooling. The cross-sectional shape of the independent circuits 15 can be circular or square, and their equivalent diameter is preferably 6mm to 12mm. The spacing between adjacent independent circuits 15 is preferably 15mm to 30mm, and the distance from the mold surface is preferably 10mm to 20mm. The above parameters can be adjusted according to the actual mold size and cooling requirements, and can be determined by those skilled in the art through a limited number of experiments. This application does not impose specific limitations.

[0059] It should be noted that the upper forming insert also has an independent circuit 15 that is symmetrical to the structure of the lower forming insert 2. This circuit is connected to the corresponding liquid inlet and liquid outlet areas of the water distribution module 4 installed on the upper mold base 3, forming an independent circulation circuit. The cooling systems on both sides of the upper mold base 3 and the lower mold base 1 have symmetrical structures and the same working principle. The lower forming insert 2 and its corresponding water distribution module 4 on one side of the lower mold base 1 will be used as an example for explanation. The structure on one side of the upper forming insert can be understood by referring to this example.

[0060] To achieve more precise gradient temperature control, each liquid inlet and outlet zone can be further subdivided into multiple smaller zones.

[0061] like Figure 8 , Figure 9 and Figure 11 As shown, taking the A-pillar region as an example, the first cooling channel inlet area 9 is further divided into three sections: first cooling channel inlet section 1 (9.1), first cooling channel inlet section 2 (9.2), and first cooling channel inlet section 3 (9.3). These three inlet sections are arranged sequentially along the length of the A-pillar region. Correspondingly, the first cooling channel outlet area 5 is further divided into three sections: first cooling channel outlet section 1 (5.1), first cooling channel outlet section 2 (5.2), and first cooling channel outlet section 3 (5.3). The number of outlet sections is the same as the number of inlet sections, and their positions correspond one-to-one. They are used to receive the coolant supplied from the corresponding inlet section after heat exchange through the independent circuit 15.

[0062] Similarly, such as Figure 11 As shown, the second cooling channel liquid inlet area 10 corresponding to the B-pillar region is further divided into the second cooling channel liquid inlet section one 10.1, the second cooling channel liquid inlet section two 10.2, and the second cooling channel liquid inlet section three 10.3. The three liquid inlet sections are arranged sequentially along the length of the B-pillar region.

[0063] The third cooling channel inlet area 11 corresponding to the C-pillar region is further divided into third cooling channel inlet section 11.1, third cooling channel inlet section 2 11.2 and third cooling channel inlet section 3 11.3. The third cooling channel outlet area 7 is correspondingly divided into third cooling channel outlet section 1 7.1, third cooling channel outlet section 2 7.2 and third cooling channel outlet section 3 7.3.

[0064] Through the above further refinement, each liquid inlet zone and liquid outlet zone is an independent sub-chamber, which is connected to a partial independent circuit 15 of the corresponding area of ​​the forming insert. This allows for more precise gradient temperature control within the A-pillar area, the B-pillar area, and the C-pillar area. For example, different height positions in the B-pillar area can obtain different cooling rates and final strengths according to the needs of the collision load distribution.

[0065] like Figure 8 , Figure 9 and Figure 11 As shown, in order to realize the cascade utilization of coolant heat and reduce the energy consumption of external temperature control equipment, the present invention sets up an energy cascade utilization structure inside the water distribution module 4.

[0066] Specifically, a heat exchange tube 18 is installed in the second cooling channel drainage area 6 (i.e., the drainage area of ​​the B-pillar region). The heat exchange tube 18 is a metal tube with good thermal conductivity, preferably stainless steel or copper. The inlet end of the heat exchange tube 18 is connected to the third cooling channel drainage area 7 (i.e., the drainage area of ​​the C-pillar region), and the outlet end of the heat exchange tube 18 extends to the outside of the water distribution module 4 and is connected to the external coolant recovery system.

[0067] like Figure 8 As shown, the heat exchange tube 18 is preferably arranged in an S-shape or U-shape in the internal cavity of the second cooling channel drainage zone 6 to extend the flow path and residence time of the high-temperature coolant in the second cooling channel drainage zone 6, increase the heat exchange time, and improve the heat exchange efficiency.

[0068] More preferably, such as Figure 8 As shown in the partial view, fins 19 are provided on the outer surface of the heat exchange tube 18. The fins 19 are either annular thin plates surrounding the outer wall of the heat exchange tube 18, or longitudinal fins extending axially along the heat exchange tube 18. The fins 19 are fixedly connected to the outer wall of the heat exchange tube 18 (e.g., by welding, expansion, or integral molding) to increase the contact area between the heat exchange tube 18 and the coolant in the second cooling channel drainage zone 6, thereby further improving heat exchange efficiency. The material of the fins 19 is preferably aluminum or copper, the fin spacing is preferably 3mm to 10mm, and the fin height is preferably 5mm to 15mm.

[0069] like Figure 11As shown, the second cooling channel drainage area 6 and the first cooling channel inlet area 9 are connected by a conduit 20. The conduit 20 is a metal pipe, one end of which is connected to the second cooling channel drainage area 6, and the other end is connected to at least one section of the first cooling channel inlet area 9 (preferably connected to the first cooling channel inlet section 9.3, i.e., the section closest to the B column in the A column area). The conduit 20 can be provided with a heat insulation layer to reduce heat loss during the transportation process.

[0070] The above structure enables heat exchange between the high-temperature coolant discharged from the C-pillar region and the low-temperature coolant discharged from the B-pillar region. This utilizes the "residual heat" of the C-pillar to heat the "residual cold" of the B-pillar, obtaining medium-temperature coolant for use in the A-pillar region, thus achieving cascaded energy utilization. For details of the specific working process, please refer to the working principle section below.

[0071] In a preferred embodiment, the water distribution module 4 is a box structure with an insulation layer. The insulation layer is disposed on the outer or inner wall of the water distribution module 4 shell to reduce heat loss of the coolant during the flow of the coolant inside the water distribution module 4, thereby improving temperature control accuracy and energy utilization efficiency. The insulation layer is preferably made of rubber-plastic sponge or polyurethane foam.

[0072] In another preferred embodiment, the heat exchange tube 18 is arranged in an S-shape, and annular fins 19 are provided on the outer side of the tube wall. The fins 19 are evenly distributed along the axial direction of the heat exchange tube 18, with a fin spacing of 5mm to 8mm. The combination of the S-shaped heat exchange tube 18 and the fins 19 significantly increases the heat exchange area and significantly improves the heat exchange efficiency, thereby further reducing the energy consumption of the external temperature control equipment.

[0073] Working principle:

[0074] I. Working process of independent zone cooling

[0075] The external coolant supply equipment delivers three different temperatures of coolant to the water distribution module 4:

[0076] B-pillar region (requiring the highest strength and fastest cooling rate): Low-temperature coolant (preferably -5℃ to 5℃) enters the second cooling channel inlet area 10 through the second cooling channel inlet supply pipe 13, and then enters the inlet end (inlet connector 16) of the independent circuit 15 corresponding to the B-pillar region in the lower forming insert 2 and the upper forming insert. The coolant flows along the independent circuit 15, absorbs the heat of the B-pillar region, and is discharged from the drain end (drain connector 17), flowing back to the second cooling channel drain area 6 through the pipeline.

[0077] C-pillar region (requiring good toughness and allowing for a slower cooling rate): High-temperature coolant (preferably 40℃~50℃) enters the third cooling channel inlet area 11 through the third cooling channel inlet supply pipe 14, and then enters the inlet end (inlet connector 16) of the independent circuit 15 corresponding to the C-pillar region in the lower forming insert 2 and the upper forming insert. The coolant flows along the independent circuit 15, absorbs heat from the C-pillar region, and is discharged from the drain end (drain connector 17), flowing back to the third cooling channel drain area 7 through the pipeline.

[0078] A-pillar area (requiring a balance of strength and toughness, with a moderate cooling rate): Medium-temperature coolant (preferably 20℃~25℃) enters the first cooling channel inlet area 9 through the first cooling channel inlet supply pipe 12, and then enters the inlet end (inlet connector 16) of the independent circuit 15 corresponding to the A-pillar area in the lower forming insert 2 and the upper forming insert. The coolant flows along the independent circuit 15, absorbs heat from the A-pillar area, and is discharged from the drain end (drain connector 17), flowing back to the first cooling channel drain area 5 through the pipeline.

[0079] The cooling cycles of the aforementioned B-pillar, C-pillar, and A-pillar regions are independent and do not interfere with each other. They are cooled with coolants of different temperatures, thus achieving independent cooling of different regions of the double-port ring within the same mold and the same stroke. Because the B-pillar region is rapidly cooled below the martensitic transformation temperature, an ultra-high-strength martensitic structure is obtained; the C-pillar region is cooled relatively gently, resulting in a tough structure dominated by bainite; and the A-pillar region is cooled at a moderate rate, resulting in a mixed structure of martensite and bainite. This achieves a gradient performance distribution on the same double-port ring part.

[0080] Building upon the aforementioned independent cooling of different zones, this invention further achieves cascaded energy utilization:

[0081] Step 1: High-temperature coolant drains from column C into the heat exchange tube. The high-temperature coolant (temperature approximately 45℃~55℃) after heat exchange in column C enters the third cooling channel drain area 7, and then flows into the inlet end of heat exchange tube 18.

[0082] In the second step, the low-temperature coolant drained from column B and the high-temperature coolant drained from column C exchange heat within the heat exchange tubes. The high-temperature coolant flows along an S-shaped or U-shaped path along the heat exchange tubes 18, and its heat is transferred through the tube walls and fins 19 to the low-temperature coolant in the second cooling channel drain area 6 (the coolant discharged after heat exchange in the B-pillar area, with a temperature of approximately 10℃ to 15℃). During this process, the high-temperature coolant drained from column C and the low-temperature coolant drained from column B exchange heat through the tube walls. The two coolants do not come into direct contact or mix, therefore their respective compositions and cleanliness remain unaffected.

[0083] The third step is to discharge the high-temperature drained liquid from column C after it releases heat. After releasing heat, the temperature of the high-temperature drained liquid from column C drops to about 35℃~40℃. It is then discharged outside the water distribution module 4 through the outlet end of heat exchange tube 18 and flows back to the external coolant supply equipment for reheating.

[0084] Step 4: The low-temperature drained coolant from column B absorbs heat and is then supplied to column A. After absorbing heat, the temperature of the low-temperature drained coolant from column B rises to approximately 20°C to 25°C, becoming a medium-temperature coolant. It flows from the drain area 6 of the second cooling channel into the inlet area 9 of the first cooling channel through conduit 20, and then is supplied to the independent circuit 15 of column A region via the inlet supply pipe 12 of the first cooling channel, serving as the medium-temperature coolant for column A region.

[0085] Through the above-mentioned energy cascade utilization structure, the present invention utilizes the high-temperature drain fluid in the C-pillar region to heat the low-temperature drain fluid in the B-pillar region, raising it to a medium temperature and then directly supplying it to the A-pillar region for use. This reduces the energy consumption of external coolant supply equipment for heating / cooling the medium-temperature coolant in the A-pillar, and realizes the cascade utilization of coolant heat.

[0086] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A dual-door ring thermoforming mold with internal partitioned independent cooling system, applied to a thermoforming mold having an upper mold base, a lower mold base, and forming inserts, characterized in that, The device includes a water distribution module (4), which has at least three independent chamber units corresponding to the A-pillar area, B-pillar area and C-pillar area on the forming insert. Each independent chamber unit has an inlet area and a drain area that are not connected to each other and are connected to an external coolant supply device. The forming insert has an independent circuit (15) for the A-pillar, B-pillar and C-pillar areas respectively. The independent circuit (15) has an inlet end connected to the inlet area of ​​the corresponding independent chamber unit and a drain end connected to the drain area, thereby forming an independent circulation circuit for coolant circulation to achieve independent cooling of the A-pillar area, B-pillar area and C-pillar area.

2. The dual-door ring thermoforming mold in-mold independent cooling system according to claim 1, characterized in that, The water separation module (4) is provided with a sealed chamber. Multiple second partition plates (22) are provided in the sealed chamber along the arrangement direction of the A, B and C columns on the shaped insert. The sealed chamber is divided into at least three independent chamber units by the second partition plates (22). Each independent chamber unit is provided with a first partition plate (8). The independent chamber unit is divided into an inlet area and an outlet area by the first partition plate (8).

3. The dual-door ring thermoforming mold in-mold independent cooling system according to claim 2, characterized in that, The independent chamber unit includes: The first cooling channel inlet area (9) and the first cooling channel outlet area (5) correspond to the A-pillar area. The second cooling channel inlet area (10) and the second cooling channel outlet area (6) correspond to the B-pillar area. The third cooling channel inlet area (11) and the third cooling channel outlet area (7) correspond to the C-pillar area.

4. The dual-door ring thermoforming mold in-mold independent cooling system according to claim 3, characterized in that, Each of the liquid inlet zones is further divided into multiple liquid inlet partitions, and each of the liquid outlet zones is further divided into multiple liquid outlet partitions, the same number as the corresponding liquid inlet partition partitions.

5. The dual-door ring thermoforming mold in-mold independent cooling system according to claim 4, characterized in that, The liquid inlet zone and liquid outlet zone include: The first cooling channel liquid inlet section 1 (9.1), the first cooling channel liquid inlet section 2 (9.2), and the first cooling channel liquid inlet section 3 (9.3) constitute the first cooling channel liquid inlet area (9). The first cooling channel drainage area (5) consists of three sections: first cooling channel drainage area 1 (5.1), first cooling channel drainage area 2 (5.2), and first cooling channel drainage area 3 (5.3). The second cooling channel liquid inlet section one (10.1), the second cooling channel liquid inlet section two (10.2), and the second cooling channel liquid inlet section three (10.3) constitute the second cooling channel liquid inlet area (10); The third cooling channel liquid inlet section one (11.1), the third cooling channel liquid inlet section two (11.2), and the third cooling channel liquid inlet section three (11.3) constitute the third cooling channel liquid inlet area (11). The third cooling channel drainage area (7) consists of three sections: Section 1 (7.1), Section 2 (7.2), and Section 3 (7.3).

6. The dual-door ring thermoforming mold in-mold independent cooling system according to claim 5, characterized in that, A heat exchange tube (18) is provided in the second cooling channel drainage area (6). The inlet end of the heat exchange tube (18) is connected to the third cooling channel drainage area (7). The outlet end of the heat exchange tube (18) extends to the outside of the water distribution module (4). The second cooling channel drainage area (6) and the first cooling channel inlet area (9) are connected by a conduit (20).

7. The dual-door ring thermoforming mold in-mold independent cooling system according to claim 6, characterized in that, One end of the conduit (20) is connected to the second cooling channel drainage area (6), and the other end is connected to at least one section in the first cooling channel inlet area (9).

8. The dual-door ring thermoforming mold in-mold independent cooling system according to claim 6, characterized in that, The heat exchange tubes (18) are arranged in an S-shape or a U-shape.

9. The dual-door ring thermoforming mold in-mold independent cooling system according to claim 6, characterized in that, The surface of the heat exchange tube (18) is provided with fins (19).

10. The dual-door ring thermoforming mold in-mold independent cooling system according to claim 1, characterized in that, The arrangement of the independent loops (15) is consistent with the contour shape of the corresponding area of ​​the forming insert.

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