Lightweight b-pillar partition heating forming device and thermoforming process thereof

Abstract

The application relates to the technical field of B column production, and discloses a lightweight B column partition heating forming device and a hot forming process thereof, which comprises a machine base, a machine frame arranged on the machine base, a stamping assembly arranged on the machine base and the machine frame, and a material ejecting mechanism arranged in the stamping assembly; the stamping assembly comprises an upper die seat and a lower die seat, an upper side of the lower die seat is provided with a die cavity, and a partition heating component for partition heating of the B column is arranged in the lower die seat. The lightweight B column partition heating forming device controls multiple heating plates in the heating system to perform partition heating on different areas of the B column product through a heater, and the upper die seat is combined with a cooling system to enable cooling water in the upper die seat to continuously flow, thereby realizing differential cooling. Through the partition heating and differential cooling mode, the performance of each area of the B column product can be effectively guaranteed, unnecessary material use is reduced, the lightweight design of the B column is realized, the overall weight of the automobile is reduced, and the development trend of automobile lightweight is met.

Description

Technical Field

[0001] This invention belongs to the field of B-pillar manufacturing technology, and particularly relates to a lightweight B-pillar partition heating and forming device and its thermoforming process. Background Technology

[0002] In the automotive manufacturing industry, the B-pillar, as a key component of the vehicle body structure, bears the important responsibility of ensuring vehicle collision safety and body structural stability. With the automotive industry's increasing demands for lightweighting, energy conservation, emission reduction, and safety performance, more stringent standards have been placed on the performance and manufacturing process of the B-pillar. Traditional B-pillar manufacturing processes often struggle to meet lightweighting requirements while ensuring sufficient strength and toughness. Hot forming technology, as an advanced manufacturing process, can effectively solve this problem. By heating the raw materials of the B-pillar to a specific temperature range and then stamping them at high temperatures, the plasticity of the material can be significantly improved. This allows the B-pillar to better conform to the mold shape during the forming process, reducing forming defects and meeting the requirements of automotive collision safety performance. Therefore, hot forming of the B-pillar has become an important technical means in the automotive manufacturing industry to improve B-pillar performance and achieve lightweighting.

[0003] Currently, existing thermoforming equipment has the following problems and shortcomings in the process of heating and forming B-pillars. First, during the stamping process of B-pillars, due to the differences in shape, thickness, and performance requirements of different areas of the B-pillar, the mold needs to maintain different temperatures in corresponding areas of the B-pillar to achieve the best forming effect. However, existing thermoforming equipment has significant limitations in temperature control, making it difficult to precisely and flexibly control the temperature of different positions of the B-pillar, thus affecting the forming quality of the B-pillar and causing defects such as springback and cracking, failing to meet the specific requirements of different areas of the B-pillar for forming performance. Second, after the stamping die completes the stamping, the upper and lower dies separate, requiring the formed B-pillar in the mold cavity to be removed. When the B-pillar product area in the mold cavity is large, a significant gripping force is generated between the B-pillar product and the mold cavity sidewall. Existing ejection mechanisms struggle to precisely control the ejection force during B-pillar product ejection. Excessive ejection force can easily damage the B-pillar product, causing scratches, dents, and other damage to its surface. Furthermore, intense ejection force can easily cause deformation of the B-pillar product, such as bending or twisting. This results in the dimensional and shape accuracy of the B-pillar product failing to meet design requirements, leading to a significant increase in the defect rate. This not only increases production costs but also affects the production efficiency and product quality of automobile manufacturing. Therefore, these shortcomings fail to meet the production and usage needs of manufacturers, necessitating further improvement.

[0004] Therefore, in view of this, we will study and improve the existing structure and its shortcomings, and provide a lightweight B-pillar partition heating and forming device and its thermoforming process, in order to achieve a more practical purpose. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a lightweight B-pillar partition heating and forming device and its thermoforming process, which is achieved by the following specific technical means:

[0006] A lightweight B-pillar partition heating and forming device includes a base, a frame disposed on the base, a stamping assembly disposed on the base and the frame, and an ejector mechanism disposed in the stamping assembly.

[0007] The stamping assembly includes an upper die base and a lower die base, and a die cavity is provided on the upper side of the lower die base. The lower die base is provided with a partition heating component for partition heating of the B-pillar, and the upper die base is provided with a cooling component for cooling down the B-pillar after heating.

[0008] A positioning post is fixedly installed at the bottom of the upper mold base, and a positioning groove matching the positioning post is opened on the lower mold base;

[0009] The ejector mechanism includes an ejector plate disposed in the lower mold base, a support component disposed in the positioning groove, the bottom of the support component being fixedly connected to the ejector plate, and a plurality of ejector components for unloading the formed B-pillar symmetrically disposed on the upper side of the ejector plate.

[0010] As a further description of the above technical solution: Multiple heating plates in the heating system control different areas of the B-pillar product for zoned heating, and combined with the cooling system to ensure continuous flow of cooling water within the upper mold base, differentiated cooling is achieved. As the temperature of the B-pillar product decreases, the internal austenitic structure transforms into martensite. Different regions acquire different martensite contents and microstructures, forming a gradient in material properties. The high-strength region obtains more martensite, resulting in higher strength and hardness, while the medium-strength region has relatively less martensite, exhibiting a certain degree of toughness. This zoned heating and differentiated cooling method effectively ensures the performance of each area of ​​the B-pillar product, reduces unnecessary material usage, achieves lightweight design of the B-pillar, reduces the overall weight of the vehicle, and aligns with the development trend of automotive lightweighting.

[0011] Furthermore, a guide post is fixedly installed at the bottom of the upper mold base, and a guide groove matching the guide post is provided on the lower mold base.

[0012] As a further description of the above technical solution: by continuously moving the upper mold base downwards, the guide post is inserted into the guide groove, achieving precise positioning and contact between the upper mold base and the lower mold base, thereby completing the mold closing action.

[0013] Furthermore, the frame is provided with a drive assembly for driving the upper mold base to rise and fall. The drive assembly includes a hydraulic cylinder fixedly mounted on the frame, and the bottom of the hydraulic cylinder is fixedly connected to the upper mold base by a piston rod.

[0014] A guide sleeve is also fixedly installed on the frame, and a guide rod is slidably installed on the inner side of the guide sleeve. The lower end of the guide rod is fixedly connected to the upper mold base.

[0015] As a further description of the above technical solution: by activating the hydraulic cylinder, the piston rod of the hydraulic cylinder pushes the upper mold base to move downward. During the downward movement of the upper mold base, the guide rod moves downward synchronously. The guide rod slides in the guide sleeve, and the cooperation between the guide rod and the guide sleeve ensures the stability of the downward movement of the upper mold base.

[0016] Furthermore, the machine base is provided with a transfer assembly for driving the lower mold base to move back and forth. The transfer assembly includes a transfer plate fixedly mounted on the rear side of the machine base, a transfer frame fixedly mounted on the bottom of the transfer plate, a drive motor fixedly mounted on one side of the transfer frame, a threaded screw fixedly connected to the output end of the drive motor, a transfer block movably mounted on the threaded screw, and the upper side of the transfer block fixedly connected to the lower mold base.

[0017] A guide rail is fixedly installed on the upper side of the machine base, and a guide slider is slidably installed on the guide rail. The upper side of the guide slider is fixedly connected to the lower mold base.

[0018] As a further description of the above technical solution: when the lower mold base moves, it drives the guide slider to slide on the guide rail. The cooperation between the guide rail and the guide slider provides a stable guide for the movement of the lower mold base, ensuring that the lower mold base can move smoothly and accurately.

[0019] Furthermore, the partitioned heating component includes a mounting bracket fixedly assembled in the lower mold base, a heater fixedly mounted on the mounting bracket, and a plurality of heating plates for partitioned heating of the B-pillar product provided on the upper side of the heater;

[0020] A heat conduction plate is fixedly installed in the lower mold base, and the upper side of the heating plate is in close contact with the heat conduction plate.

[0021] As a further description of the above technical solution: through precise control of the heater, multiple heating plates generate different amounts of heat, thereby enabling zoned heating of different areas of the B-pillar product.

[0022] Furthermore, the upper mold base has an internal cavity, and cooling water is provided in the internal cavity. The cooling component includes a cooling pump fixedly assembled on the left side of the upper mold base, a cooling pipe fixedly connected to one side of the cooling pump, and the end of the cooling pipe away from the cooling pump fixedly connected to the right side of the upper mold base.

[0023] As a further description of the above technical solution: by using a cooling pump to extract cooling water from the cavity inside the upper mold base, the cooling water in the cavity inside the upper mold base can be continuously circulated, thereby accelerating the cooling effect on the B-pillar product in the cavity.

[0024] Furthermore, the support assembly includes a support rod movably installed in the positioning groove, a limit plate is fixedly installed at the upper end of the support rod, the lower end of the support rod is fixedly connected to the top plate, and a support spring is sleeved on the outer periphery of the support rod.

[0025] As a further description of the above technical solution: This setting enables the top plate to drive the unloading ejector rod to autonomously demold the formed B-pillar product.

[0026] Furthermore, the ejector assembly includes a fixed sleeve rod fixedly assembled in the lower mold base, an ejector rod slidably installed on the inner side of the fixed sleeve rod, and a plurality of speed reduction grooves are formed on the outer periphery of the ejector rod;

[0027] An elastic telescopic component is fixedly installed on the inner wall of the fixed sleeve rod, and a striking component is fixedly connected to the end of the elastic telescopic component facing the unloading top rod.

[0028] As a further description of the above technical solution: This setting effectively reduces the upward movement speed and ejection force of the unloading ejector rod, making the ejection process gentler and reducing damage to the surface of the B-pillar product. Furthermore, by reducing the ejection force and upward movement speed of the unloading ejector rod, the B-pillar product can be subjected to more uniform force during the ejection process, reducing deformation caused by uneven force.

[0029] Furthermore, a control panel is fixedly mounted on the front side of the base.

[0030] As a further description of the above technical solution: the setting of the control panel facilitates the operation of the device and further improves its applicability.

[0031] A lightweight B-pillar partition heating molding process includes the following steps:

[0032] S1: First, accurately place the preheated sheet material onto the lower mold base;

[0033] S2: By starting the drive motor, the transfer block and the lower mold base are driven forward. As the drive motor continues to drive, the lower mold base and the sheet material on it gradually move to the bottom of the upper mold base. At this time, the drive motor stops running.

[0034] S3: Start the hydraulic cylinder. The piston rod of the hydraulic cylinder pushes the upper mold base to move downward. The guide pins and positioning pins on the upper mold base are inserted into the guide grooves and positioning grooves on the lower mold base respectively, so as to achieve precise positioning and contact between the upper mold base and the lower mold base, thereby completing the mold closing action.

[0035] S4: After the mold is closed, the upper mold base and the lower mold base apply pressure to the sheet material to complete the stamping operation, so that the sheet material forms the B-pillar product. The stamped B-pillar product is located in the mold cavity of the lower mold base.

[0036] S5: Start the heating system, use the heater to generate kinetic energy and start working. Through precise control of the heater, multiple heating plates generate different amounts of heat, thus enabling zoned heating of different areas of the B-pillar product.

[0037] S6: Start the cooling system. The cooling pump draws cooling water from the cavity inside the upper mold base, causing the cooling water in the cavity inside the upper mold base to circulate continuously, thereby accelerating the cooling of the B-pillar product in the cavity.

[0038] S7: Finally, the ejector pin pushes the B-pillar product formed in the mold cavity of the lower mold base to perform demolding, realizing the autonomous demolding of the B-pillar product, and continuing to the next cycle.

[0039] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0040] 1. This lightweight B-pillar zoned heating and forming device uses heaters in the heating system to control multiple heating plates to heat different areas of the B-pillar product in zones. Combined with a cooling system that keeps the cooling water flowing in the upper mold base, it achieves differentiated cooling. As the temperature of the B-pillar product decreases, the internal austenitic structure transforms into martensite. Different regions obtain different martensite contents and microstructures, forming a gradient in material properties. The high-strength region obtains more martensite, resulting in higher strength and hardness, while the medium-strength region has a relatively lower martensite content and a certain degree of toughness. Through this zoned heating and differentiated cooling method, the performance of each area of ​​the B-pillar product can be effectively guaranteed, unnecessary material usage can be reduced, and a lightweight design of the B-pillar can be achieved. This reduces the overall weight of the car, helps improve fuel economy and driving range, and is in line with the development trend of automotive lightweighting.

[0041] 2. This lightweight B-pillar partitioned heating and forming device effectively reduces the upward speed and ejection force of the unloading ejector rod by having a speed-reducing groove on the ejector rod contact the striking component during the upward movement of the ejector rod. The elastic telescopic component pushes the striking component into contact with the speed-reducing groove, resulting in a smoother ejection process. This design significantly reduces damage to the surface of the B-pillar product, preventing scratches, dents, and other defects caused by excessive ejection force or speed, thus improving the product's appearance quality. Simultaneously, reducing the ejection force and upward speed of the ejector rod ensures more uniform stress distribution on the B-pillar product during ejection, reducing deformation caused by uneven stress, guaranteeing dimensional accuracy and shape stability, and improving the product's yield rate.

[0042] 3. This lightweight B-pillar partition heating and molding device utilizes an elastic telescopic component to push the striking component into contact with the deceleration groove. The striking component then strikes the ejector pin, inducing resonance. This rapidly disrupts the adhesion between the B-pillar and the lower mold cavity sidewall, transforming static friction into dynamic friction. This significantly reduces frictional resistance during ejection, drastically decreasing the initial force required for the ejector pin to eject the B-pillar. The ejection process becomes smoother and easier. This design not only shortens ejection time and improves production efficiency but also reduces the risk of product damage from prolonged ejection. Furthermore, it enhances the ejection quality and integrity, ensuring the B-pillar emerges from the mold cavity in good condition, reducing subsequent processing and repair work, and lowering production costs. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 A schematic diagram of the overall three-dimensional structure provided according to an embodiment of the present invention is shown;

[0045] Figure 2 A schematic diagram of the transfer assembly and lower mold base mounting structure provided according to an embodiment of the present invention is shown;

[0046] Figure 3 A structural diagram of the mounting base and transfer assembly provided according to an embodiment of the present invention is shown;

[0047] Figure 4 A schematic diagram of the transfer component structure provided according to an embodiment of the present invention is shown;

[0048] Figure 5A schematic diagram of the rack and drive assembly mounting structure provided according to an embodiment of the present invention is shown;

[0049] Figure 6 A schematic diagram of the upper mold base and lower mold base structure provided according to an embodiment of the present invention is shown;

[0050] Figure 7 A schematic diagram of the mounting structure of the upper mold base and cooling components according to an embodiment of the present invention is shown;

[0051] Figure 8 A schematic diagram of a partial structure of the lower mold base provided according to an embodiment of the present invention is shown. Figure 1 ;

[0052] Figure 9 A schematic diagram of a partial structure of the lower mold base provided according to an embodiment of the present invention is shown. Figure 2 ;

[0053] Figure 10 A schematic diagram of the mounting structure of the lower mold base and the partition heating component provided according to an embodiment of the present invention is shown;

[0054] Figure 11 The present invention provides an embodiment of the invention. Figure 8 Enlarged diagram of part A in the middle;

[0055] Figure 12 The present invention provides an embodiment of the invention. Figure 8 Enlarged schematic diagram of part B in the middle.

[0056] Explanation of reference numerals in the attached figures:

[0057] 10. Base; 11. Rack; 12. Control panel;

[0058] 20. Stamping assembly; 21. Upper die holder; 211. Guide post; 212. Positioning post; 22. Lower die holder; 221. Guide groove; 222. Positioning groove; 223. Heat transfer plate;

[0059] 30. Drive assembly; 31. Hydraulic cylinder; 32. Piston rod; 33. Guide sleeve; 34. Guide rod;

[0060] 40. Transfer assembly; 41. Transfer plate; 42. Transfer frame; 43. Drive motor; 44. Threaded screw; 45. Transfer block; 46. Guide rail; 47. Guide slider;

[0061] 50. Cooling components; 51. Cooling pump; 52. Cooling pipes;

[0062] 60. Zoned heating component; 61. Mounting bracket; 62. Heater; 63. Heating plate;

[0063] 70. Ejector mechanism; 71. Ejector plate; 72. Support assembly; 721. Support link; 722. Limiting plate; 723. Support spring; 73. Ejector assembly; 731. Fixed sleeve rod; 732. Unloading ejector rod; 7321. Speed ​​reduction groove; 733. Elastic telescopic component; 734. Striking component. Detailed Implementation

[0064] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0065] Please see Figures 1 to 12 A lightweight B-pillar partition heating and forming device includes a base 10, a frame 11 mounted on the base 10, a stamping assembly 20 mounted on the base 10 and the frame 11, and an ejector mechanism 70 mounted in the stamping assembly 20. The stamping assembly 20 includes an upper die base 21 and a lower die base 22, with a die cavity on the upper side of the lower die base 22. The lower die base 22 is provided with a partition heating component 60 for partition heating of the B-pillar, and the upper die base 21 is provided with a partition heating component 60 for partition heating of the B-pillar. A cooling component 50 is used to cool down the temperature after heating; a positioning post 212 is fixedly installed at the bottom of the upper mold base 21, and a positioning groove 222 matching the positioning post 212 is opened on the lower mold base 22; the ejector mechanism 70 includes an ejector plate 71 disposed in the lower mold base 22, a support component 72 is disposed in the positioning groove 222, the bottom of the support component 72 is fixedly connected to the ejector plate 71, and a number of ejector components 73 for unloading the formed B-pillar are symmetrically disposed on the upper side of the ejector plate 71.

[0066] The heater 62 in the heating system controls multiple heating plates 63 to heat different areas of the B-pillar product in zones. Combined with the cooling system, cooling water in the upper mold base 21 is continuously circulated to achieve differentiated cooling. As the temperature of the B-pillar product decreases, the internal austenitic structure transforms into martensite. Different regions obtain different martensite contents and microstructures, forming a gradient in material properties. The high-strength area obtains more martensite, resulting in higher strength and hardness, while the medium-strength area has relatively less martensite and a certain degree of toughness. Through this zoned heating and differentiated cooling method, the performance of each area of ​​the B-pillar product can be effectively guaranteed, unnecessary material usage can be reduced, and a lightweight design of the B-pillar can be achieved, reducing the overall weight of the car and conforming to the development trend of automotive lightweighting.

[0067] Please see Figures 1 to 3 A control panel 12 is fixedly mounted on the front side of the base 10; the control panel facilitates the operation of the device.

[0068] Please see Figures 2 to 4 The machine base 10 is provided with a transfer assembly 40 for driving the lower mold base 22 to move back and forth. The transfer assembly 40 includes a transfer plate 41 fixedly mounted on the rear side of the machine base 10. A transfer frame 42 is fixedly mounted on the bottom of the transfer plate 41. A drive motor 43 is fixedly mounted on one side of the transfer frame 42. A threaded screw 44 is fixedly connected to the output end of the drive motor 43. A transfer block 45 is movably mounted on the threaded screw 44. The upper side of the transfer block 45 is fixedly connected to the lower mold base 22. A guide slide rail 46 is also fixedly mounted on the upper side of the machine base 10, and a guide slider 47 is slidably mounted on the guide slide rail 46. The upper side of 7 is fixedly connected to the lower mold base 22. By starting the drive motor 43, after the drive motor 43 runs, its output end drives the threaded screw 44 to start rotating. During the rotation of the threaded screw 44, it drives the transfer block 45 to move forward. Since the transfer block 45 is fixedly connected to the lower mold base 22, the movement of the transfer block 45 will synchronously drive the lower mold base 22 to move. At the same time, when the lower mold base 22 moves, it drives the guide slider 47 to slide on the guide slide rail 46. The cooperation between the guide slide rail 46 and the guide slider 47 provides a stable guide for the movement of the lower mold base 22, ensuring that the lower mold base 22 can move smoothly and accurately.

[0069] Please see Figure 1 , Figure 5 The frame 11 is equipped with a drive assembly 30 for driving the upper mold base 21 to rise and fall. The drive assembly 30 includes a hydraulic cylinder 31 fixedly mounted on the frame 11. The bottom of the hydraulic cylinder 31 is fixedly connected to the upper mold base 21 by a piston rod 32. A guide sleeve 33 is also fixedly mounted on the frame 11. A guide rod 34 is slidably mounted on the inner side of the guide sleeve 33. The lower end of the guide rod 34 is fixedly connected to the upper mold base 21. By activating the hydraulic cylinder 31, the piston rod 32 of the hydraulic cylinder 31 pushes the upper mold base 21 to move downward. During the downward movement of the upper mold base 21, the guide rod 34 moves downward synchronously. The guide rod 34 slides in the guide sleeve 33. The cooperation between the guide rod 34 and the guide sleeve 33 ensures the stability of the downward movement of the upper mold base 21.

[0070] Please see Figures 6 to 8 The bottom of the upper mold base 21 is fixedly installed with a guide post 211, and the lower mold base 22 is provided with a guide groove 221 that matches the guide post 211. As the upper mold base 21 moves down continuously, the guide post 211 is inserted into the guide groove 221, so as to achieve precise positioning and contact between the upper mold base 21 and the lower mold base 22, thereby completing the mold closing action.

[0071] Please see Figures 8 to 10The zoned heating component 60 includes a mounting bracket 61 fixedly assembled in the lower mold base 22. A heater 62 is fixedly mounted on the mounting bracket 61. Several heating plates 63 for zoned heating of the B-pillar product are arranged on the upper side of the heater 62. A heat conduction plate 223 is fixedly installed in the lower mold base 22, and the upper side of the heating plate 63 is in close contact with the heat conduction plate 223. The heater 62 generates kinetic energy and starts working. Since multiple heating plates 63 are arranged above the heater 62, the multiple heating plates 63 generate different amounts of heat through precise control of the heater 62, thereby enabling zoned heating of different areas of the B-pillar product.

[0072] Please see Figures 6 to 7 The upper mold base 21 has an internal cavity containing cooling water. The cooling component 50 includes a cooling pump 51 fixedly mounted on the left side of the upper mold base 21. A cooling pipe 52 is fixedly connected to one side of the cooling pump 51, and the end of the cooling pipe 52 away from the cooling pump 51 is fixedly connected to the right side of the upper mold base 21. The cooling pump 51 draws cooling water from the internal cavity of the upper mold base 21. After being transported by the cooling pump 51, the cooling water flows through the cooling pipe 52 in the external environment. The cold air in the external environment cools the cooling water in the cooling pipe 52. The cooled water is then transported back to the internal cavity of the upper mold base 21 through the other end of the cooling pipe 52, so that the cooling water in the internal cavity of the upper mold base 21 continuously circulates, thereby accelerating the cooling effect on the B-pillar product in the cavity.

[0073] Please see Figures 8 to 11 The support assembly 72 includes a support rod 721 movably installed in the positioning groove 222. A limit plate 722 is fixedly installed at the upper end of the support rod 721, and the lower end of the support rod 721 is fixedly connected to the top plate 71. A support spring 723 is sleeved on the outer periphery of the support rod 721. This arrangement enables the top plate 71 to drive the unloading push rod 732 to independently demold the formed B-pillar product.

[0074] Please see Figures 8 to 12The ejector assembly 73 includes a fixed sleeve rod 731 fixedly assembled in the lower mold base 22. An ejector rod 732 is slidably mounted on the inner side of the fixed sleeve rod 731. Several deceleration grooves 7321 are formed on the outer periphery of the ejector rod 732. An elastic telescopic member 733 is fixedly mounted on the inner wall of the fixed sleeve rod 731. A striking member 734 is fixedly connected to one end of the elastic telescopic member 733 facing the ejector rod 732. During the upward movement of the ejector rod 732, the ejector rod 732... The speed reduction groove 7321 on the upper part will come into contact with the striking part 734. The elastic telescopic part 733 pushes the striking part 734 into contact with the speed reduction groove 7321, which effectively reduces the upward movement speed and ejection force of the unloading push rod 732, making the ejection process more gentle and reducing damage to the surface of the B-pillar product. Furthermore, by reducing the ejection force and upward movement speed of the unloading push rod 732, the B-pillar product can be subjected to more uniform force during the ejection process, reducing deformation caused by uneven force.

[0075] A lightweight B-pillar partition heating molding process includes the following steps:

[0076] S1: First, accurately place the preheated sheet material onto the lower mold base 22;

[0077] S2: By starting the drive motor 43, the transfer block 45 and the lower mold base 22 are driven to move forward. As the drive motor 43 continues to drive, the lower mold base 22 and the plate material on it gradually move to the bottom of the upper mold base 21. At this time, the drive motor 43 stops running.

[0078] S3: Start the hydraulic cylinder 31. The piston rod 32 of the hydraulic cylinder 31 pushes the upper mold base 21 to move downward. The guide pin 211 and the positioning pin 212 on the upper mold base 21 are inserted into the guide groove 221 and the positioning groove 222 on the lower mold base 22 respectively, so as to achieve precise positioning and contact between the upper mold base 21 and the lower mold base 22, thereby completing the mold closing action.

[0079] S4: After the mold is closed, the upper mold base 21 and the lower mold base 22 apply pressure to the sheet material to complete the stamping operation, so that the sheet material forms the B-pillar product. The stamped B-pillar product is located in the mold cavity of the lower mold base 22.

[0080] S5: Start the heating system, use heater 62 to generate kinetic energy and start working. Through the precise control of heater 62, multiple heating plates 63 generate different amounts of heat, so that different areas of the B-pillar product can be heated in zones.

[0081] S6: Start the cooling system. Cooling pump 51 draws cooling water from the cavity inside the upper mold base 21, so that the cooling water in the cavity inside the upper mold base 21 circulates continuously, thereby accelerating the cooling of the B-pillar product in the cavity.

[0082] S7: Finally, the ejector pin 732 pushes the B-pillar product formed in the mold cavity of the lower mold base 22 to perform demolding, realizing the autonomous demolding of the B-pillar product, and continuing to the next cycle.

[0083] The specific usage and function of this embodiment are as follows:

[0084] Working principle: First, the preheated sheet material is precisely placed on the lower mold base 22. The operator starts the drive motor 43 through the control panel 12. After the drive motor 43 starts running, its output end drives the threaded screw 44 to start rotating. During the rotation of the threaded screw 44, the transfer block 45 is driven to move forward. Since the transfer block 45 is fixedly connected to the lower mold base 22, the movement of the transfer block 45 will synchronously drive the lower mold base 22 to move. At the same time, when the lower mold base 22 moves, it drives the guide slider 47 to slide on the guide rail 46. The cooperation between the guide rail 46 and the guide slider 47 provides a stable guide for the movement of the lower mold base 22, ensuring that the lower mold base 22 can move smoothly and accurately. As the drive motor 43 continues to drive, the lower mold base 22 and the sheet material on it gradually move to the bottom of the upper mold base 21. At this time, the drive motor 43 stops running.

[0085] Start the hydraulic cylinder 31. The piston rod 32 of the hydraulic cylinder 31 pushes the upper mold base 21 to move downward. During the downward movement of the upper mold base 21, the guide rod 34 moves downward synchronously. The guide rod 34 slides in the guide sleeve 33. The cooperation between the guide rod 34 and the guide sleeve 33 ensures the stability of the downward movement of the upper mold base 21. As the upper mold base 21 continues to move downward, the guide post 211 and the positioning post 212 are respectively inserted into the guide groove 221 and the positioning groove 222 on the lower mold base 22, realizing the precise positioning and contact between the upper mold base 21 and the lower mold base 22, thereby completing the mold closing action. After the mold is closed, the upper mold base 21 and the lower mold base 22 apply pressure to the sheet material to complete the stamping operation, so that the sheet material forms the B-pillar product. The stamped B-pillar product is located in the mold cavity of the lower mold base 22.

[0086] During the process of the upper mold base 21 moving downward and driving the positioning pin 212 to insert into the positioning slot 222, the positioning pin 212 continuously moves downward, pushing the limiting plate 722 and the support connecting rod 721 to move downward, thereby driving the ejector plate 71 and the unloading ejector rod 732 to move downward synchronously, so that the upper end of the unloading ejector rod 732 is flush with the mold cavity surface of the lower mold base 22; at the same time, after the B-pillar product is stamped, the heating system is started by controlling the control panel 12, using the heater 62 to generate kinetic energy and start working. Since multiple heating plates 63 are set above the heater 62, through the precise control of the heater 62, the multiple heating plates 63 generate different amounts of heat, thereby allowing for zoned heating of different areas of the B-pillar product; and while holding the pressure, the cooling system starts to operate, the cooling pump 51 draws cooling water from the cavity inside the upper mold base 21, and the cooling water flows through the cooling pipe 5 in the external environment after being transported by the cooling pump 51. 2. The cold air in the external environment cools the cooling water in the cooling pipe 52. The cooled water is then transported back to the inner cavity of the upper mold base 21 through the other end of the cooling pipe 52, so that the cooling water in the inner cavity of the upper mold base 21 is continuously circulated, thereby accelerating the cooling effect on the B-pillar product in the cavity. As the temperature of the B-pillar product decreases, its internal austenitic structure begins to transform into martensite. Due to the adoption of zoned heating and differentiated cooling, different areas of the B-pillar product obtain different martensite content and microstructure, realizing the gradient of material properties. The high-strength area obtains more martensite, which has higher strength and hardness, while the medium-strength area has relatively less martensite content and has a certain degree of toughness. After appropriate zoned heating treatment, the performance of each area can be effectively guaranteed, thereby reducing unnecessary material use, realizing the lightweight design of the B-pillar, and reducing the overall weight of the car.

[0087] After the B-pillar product has cooled down, the hydraulic cylinder 31 drives the upper mold base 21 to move upward and return to its initial position, awaiting the next stamping operation. As the positioning pin 212 separates from the positioning groove 222, the elastic force of the support spring 723 pushes the limiting plate 722 and the support connecting rod 721 to move upward. During the upward movement of the support connecting rod 721, the ejector plate 71 moves upward synchronously, and the ejector plate 71 in turn drives the unloading ejector rod 732 to move upward synchronously. The unloading ejector rod 732 pushes the B-pillar product formed in the mold cavity of the lower mold base 22 to perform the demolding operation, realizing the autonomous demolding of the B-pillar product. In addition, during the upward movement of the unloading ejector rod 732, the deceleration groove 7321 on the unloading ejector rod 732 will contact the striking part 734. The elastic telescopic part 733 pushes the striking part 734 to contact the deceleration groove 7321, effectively reducing the upward movement speed and ejection force of the unloading ejector rod 732, making the ejection process smoother. This reduces damage to the surface of the B-pillar product. Furthermore, by reducing the ejection force and upward speed of the ejector pin 732, the force on the B-pillar product during ejection is more uniform, reducing deformation caused by uneven force. At the moment when the elastic telescopic member 733 pushes the striking member 734 into contact with the deceleration groove 7321, the striking member 734 strikes the ejector pin 732, triggering resonance. This resonant vibration can quickly disrupt the adsorption state between the B-pillar product and the mold cavity sidewall of the lower mold base 22, breaking the intermolecular forces between the B-pillar product and the mold cavity, loosening the adsorption relationship, and significantly reducing the adsorption force. In addition, the vibration will also cause a small relative movement between the B-pillar product and the mold cavity surface, transforming static friction into dynamic friction, significantly reducing the frictional resistance during the ejection process, greatly reducing the initial force required by the ejector pin 732 when ejecting the B-pillar product, and making the ejection process easier and smoother.

[0088] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A lightweight B-pillar partition heating and forming device, comprising a base (10) and a frame (11) disposed on the base (10), characterized in that: It also includes a stamping assembly (20) disposed on the base (10) and the frame (11), and an ejector mechanism (70) disposed in the stamping assembly (20); The stamping assembly (20) includes an upper die base (21) and a lower die base (22), and a die cavity is provided on the upper side of the lower die base (22). A partition heating component (60) for partition heating of the B-pillar is provided in the lower die base (22), and a cooling component (50) for cooling down the B-pillar after heating is provided on the upper die base (21). The bottom of the upper mold base (21) is fixedly installed with a positioning post (212), and the lower mold base (22) is provided with a positioning groove (222) that matches the positioning post (212). The ejector mechanism (70) includes an ejector plate (71) disposed in the lower mold base (22), a support component (72) is disposed in the positioning groove (222), the bottom of the support component (72) is fixedly connected to the ejector plate (71), and a plurality of ejector components (73) for unloading the B-pillar are symmetrically disposed on the upper side of the ejector plate (71). The support assembly (72) includes a support rod (721) movably installed in the positioning groove (222). The upper end of the support rod (721) is fixedly installed with a limit plate (722), and the lower end of the support rod (721) is fixedly connected to the top plate (71). A support spring (723) is sleeved on the outer periphery of the support rod (721). The ejector assembly (73) includes a fixed sleeve rod (731) fixedly assembled in the lower mold base (22), and an ejector rod (732) is slidably installed on the inner side of the fixed sleeve rod (731). The ejector rod (732) has several speed reduction grooves (7321) on its outer periphery. An elastic telescopic member (733) is fixedly installed on the inner wall of the fixed sleeve rod (731), and a striking member (734) is fixedly connected to one end of the elastic telescopic member (733) facing the unloading top rod (732).

2. The lightweight B-pillar partition heating and forming device according to claim 1, characterized in that: The bottom of the upper mold base (21) is fixedly installed with a guide post (211), and the lower mold base (22) is provided with a guide groove (221) that matches the guide post (211).

3. The lightweight B-pillar partition heating and forming device according to claim 1, characterized in that: The frame (11) is provided with a drive assembly (30) for driving the upper mold base (21) to rise and fall. The drive assembly (30) includes a hydraulic cylinder (31) fixedly mounted on the frame (11). The bottom of the hydraulic cylinder (31) is fixedly connected to the upper mold base (21) by a piston rod (32). A guide sleeve (33) is also fixedly installed on the frame (11). A guide rod (34) is slidably installed on the inner side of the guide sleeve (33). The lower end of the guide rod (34) is fixedly connected to the upper mold base (21).

4. The lightweight B-pillar partition heating and forming device according to claim 1, characterized in that: The base (10) is provided with a transfer assembly (40) for driving the lower mold base (22) to move back and forth. The transfer assembly (40) includes a transfer plate (41) fixedly mounted on the rear side of the base (10). A transfer frame (42) is fixedly installed on the bottom of the transfer plate (41). A drive motor (43) is fixedly installed on one side of the transfer frame (42). A threaded screw (44) is fixedly connected to the output end of the drive motor (43). A transfer block (45) is movably mounted on the threaded screw (44). The upper side of the transfer block (45) is fixedly connected to the lower mold base (22). The upper side of the base (10) is also fixedly installed with a guide slide rail (46), and a guide slider (47) is slidably installed on the guide slide rail (46). The upper side of the guide slider (47) is fixedly connected to the lower mold base (22).

5. The lightweight B-pillar partition heating and forming device according to claim 1, characterized in that: The partition heating component (60) includes a mounting bracket (61) fixedly assembled in the lower mold base (22), a heater (62) is fixedly mounted on the mounting bracket (61), and a plurality of heating plates (63) for partition heating of the B-pillar product are provided on the upper side of the heater (62). A heat conduction plate (223) is fixedly installed in the lower mold base (22), and the upper side of the heating plate (63) is in contact with the heat conduction plate (223).

6. The lightweight B-pillar partition heating and forming device according to claim 1, characterized in that: The upper mold base (21) has an internal cavity, and cooling water is provided in the internal cavity. The cooling component (50) includes a cooling pump (51) fixedly mounted on the left side of the upper mold base (21). A cooling pipe (52) is fixedly connected to one side of the cooling pump (51). The end of the cooling pipe (52) away from the cooling pump (51) is fixedly connected to the right side of the upper mold base (21).

7. The lightweight B-pillar partition heating and forming device according to claim 1, characterized in that: A control panel (12) is fixedly mounted on the front side of the base (10).

8. A lightweight B-pillar partitioned heating and forming process, applied to the lightweight B-pillar partitioned heating and forming apparatus according to any one of claims 1-7, characterized in that, Includes the following steps: S1: First, place the preheated sheet material precisely on the lower mold base (22); S2: By starting the drive motor (43), the transfer block (45) and the lower mold base (22) are driven to move forward. As the drive motor (43) continues to drive, the lower mold base (22) and the plate material on it gradually move to the bottom of the upper mold base (21). At this time, the drive motor (43) stops running. S3: Start the hydraulic cylinder (31). The piston rod (32) of the hydraulic cylinder (31) pushes the upper mold base (21) to move downward. The guide pin (211) and the positioning pin (212) on the upper mold base (21) are respectively inserted into the guide groove (221) and the positioning groove (222) on the lower mold base (22) to achieve precise positioning and contact between the upper mold base (21) and the lower mold base (22), thereby completing the mold closing action. S4: After the mold is closed, the upper mold base (21) and the lower mold base (22) apply pressure to the sheet material to complete the stamping operation, so that the sheet material forms a B-pillar product. The stamped B-pillar product is located in the mold cavity of the lower mold base (22). S5: Start the heating system, use the heater (62) to generate kinetic energy and start working. Through the precise control of the heater (62), multiple heating plates (63) generate different heat, so that different areas of the B-pillar product can be heated in zones. S6: Start the cooling system. The cooling pump (51) draws the cooling water in the cavity of the upper mold base (21) so that the cooling water in the cavity of the upper mold base (21) circulates continuously, thereby accelerating the cooling of the B-pillar product in the cavity. S7: Finally, the B-pillar product formed in the mold cavity of the lower mold base (22) is pushed by the ejector pin (732) to perform demolding operation, so as to realize the autonomous demolding of the B-pillar product and continue the next cycle.

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