An integrally formed lightweight stamped automotive body part and method of stamping

Abstract

The application relates to the technical field of stamping parts, in particular to an integrally-formed automobile body lightweight stamping part and a stamping method thereof, which comprises an upper die set, the upper die set comprises an upper die base and a main male die fixedly connected to the lower end surface of the upper die base, the lower end surface of the main male die is provided with a rib part profile, a lower die set, the lower die set comprises a lower die base and a main female die fixedly connected to the upper end surface of the lower die base, the main female die is provided with a cavity matched with the shape of the main male die, and the lower die set and the upper die set are fixedly connected through a plurality of elastic expansion rods. The thickness detection assembly is arranged, the self-adaptive assembly is matched, real-time detection of the thickness of a to-be-stamped lightweight plate before die closing is realized, the elastic supporting assembly and the local forming assembly are arranged, one-time stamping and integrally forming of a variable cross-section stamping part are realized, the die cooling assembly is arranged, and closed-loop control of the temperature of a stamping die is realized.

Description

Technical Field

[0001] This invention relates to the field of stamping technology, specifically to lightweight stamped parts for automobile bodies formed in one piece and the stamping method thereof. Background Technology

[0002] With the development of lightweighting and energy conservation in the automotive industry, lightweight stamped parts for automotive bodies are generally designed with variable cross-section structures to balance structural strength and weight. This means that the thickness of different areas of the workpiece is distributed differently, and local reinforcing ribs are used to optimize mechanical properties. For such variable cross-section workpieces, traditional processes often adopt multi-process step-by-step forming. First, the basic shape is stamped, and then local structural processing such as upsetting and forming of high-rise reinforcing ribs is completed through secondary stamping. This process has drawbacks. During the secondary stamping, the previous process has already caused work hardening of the workpiece material. In addition, the local material flow is intense, which can easily lead to secondary tearing and stress concentration problems in the thickened areas and at the roots of the reinforcing ribs. The scrap rate of the workpiece remains high and the production stability is poor. The essence of this problem is that the material stress path is uncontrollable in continuous processes. Conventional molds cannot simultaneously meet the two different material flow requirements of large-formation forming and local thickening and high-rib forming in a single stamping.

[0003] Existing stamping dies cannot adaptively match the thickness of lightweight sheet metal to adjust stamping parameters, support force, and temperature control parameters for different thicknesses of lightweight sheet metal. They have poor versatility and are prone to uneven stress, out-of-tolerance forming dimensions, and workpiece damage during mold closing due to thickness deviations. Furthermore, mold temperature rise can easily lead to workpiece thermal springback and deformation. Demolding relies heavily on manual assistance, and the level of intelligence and automation is low, making it difficult to meet the high-precision, integrated, and high-efficiency production requirements of lightweight stamping parts with variable cross-sections for automotive bodies. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides an integrated lightweight stamped part for automobile body and its stamping method, which can effectively solve the problems of poor adaptability, lack of temperature control, insufficient buffering, inconvenient demolding, low level of intelligence and poor forming accuracy of traditional stamping process.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides an integrated lightweight stamping part for automobile body, including an upper die, the upper die including an upper die base and a main punch fixedly connected to the lower end face of the upper die base, the lower end face of the main punch having a rib profile. The lower mold component includes a lower mold base and a main die fixedly connected to the upper end face of the lower mold base. The main die has a cavity that matches the shape of the main punch. The lower mold component and the upper mold component are fixedly connected by multiple elastic telescopic rods. The stamping adaptive mechanism includes two thickness detection components, two adaptive components, a partial forming component, an elastic support component, and two mold cooling components. The two thickness detection components are symmetrically arranged on both sides of the cavity and fixed to the upper end face of the lower mold base. They are used to detect the thickness of the workpiece to be stamped and transmit the thickness signal before mold closing. The two adaptive components cooperate with the two thickness detection components and are electrically linked with the thickness detection components, the elastic support component, and the mold cooling components, respectively. The elastic support component is fixedly installed in the main die cavity and is used to elastically buffer and support the workpiece during stamping. When the mold opens, the workpiece is ejected and demolded. The partial forming component is fixedly installed at the support end of the elastic support component. The two mold cooling components are respectively installed inside the main punch and the main die cavity and are used to cool the mold in real time and maintain the mold working temperature stably.

[0006] According to the aforementioned integrated lightweight stamped automotive body part, the thickness detection component includes a through groove on the side wall of the main die, a cylindrical block slidably connected in the through groove, two concave grooves on the side wall of the main die, convex slide bars slidably connected in both concave grooves, a chamfered frame fixedly connected between the side walls of the two convex slide bars, a base plate fixedly connected to the bottom surface of the chamfered frame, two No. 1 springs fixedly connected between the base plate and the upper surface of the lower die base, two guide rods fixedly connected to the side wall of the cylindrical block, both guide rods slidably connected through the side wall of the chamfered frame, two No. 2 springs fixedly connected between the cylindrical block and the inner wall of the chamfered frame, and a beveled flat-bottom detection block fixedly connected to the side wall of the cylindrical block away from the chamfered frame.

[0007] According to the aforementioned integrated lightweight stamping part for automotive body, a PLC controller is fixedly mounted on the side wall of the main die. The adaptive component includes a C-shaped mounting base fixedly connected to the upper surface of the lower die base. A variable resistance rod is fixedly mounted on the inner wall of the C-shaped mounting base. A conductive ring is slidably sleeved on the variable resistance rod. A connecting plate is fixedly connected to the side wall of the C-shaped frame. The side end of the connecting plate is fixedly connected to the side wall of the conductive ring.

[0008] According to the aforementioned integrated lightweight stamped automotive body part, the partially formed component includes a cylindrical cavity formed in a main die, a cylindrical groove formed on the inner bottom surface of the main die, the cylindrical groove being connected to the cylindrical cavity, a core column being slidably connected in the cylindrical groove, a first circular plate being slidably connected in the cylindrical cavity, the core column being fixedly connected to the upper surface of the first circular plate, a rectangular groove formed on the inner bottom surface of the main die, and an ejector pin being fixedly connected to the top of the core column, the ejector pin cooperating with the rectangular groove.

[0009] According to the aforementioned integrated lightweight stamped part for automotive body, the elastic support assembly includes a slide rod fixedly connected to the bottom surface of the cylindrical cavity. The first circular plate, the core column, and the top column are all slidably sleeved on the slide rod. A second circular plate is slidably sleeved on the slide rod. A third spring is fixedly connected between the first and second circular plates. Two hydraulic cylinders are fixedly installed on the bottom surface of the cylindrical cavity, and the output ends of the two hydraulic cylinders are fixedly connected to the bottom surface of the second circular plate.

[0010] According to the above-mentioned integrated lightweight stamped part for automobile body, the mold cooling assembly includes a serpentine cooling pipe disposed in the main punch. The input end and output end of the serpentine cooling pipe are respectively fixedly connected to an inlet pipe and an outlet pipe, and a solenoid valve is fixedly installed on the inlet pipe.

[0011] According to the above-mentioned integrated lightweight stamped part for automobile body, the two No. 2 springs are respectively sleeved on the two guide rods, the two guide rods are arranged in parallel, and the two base plates are arranged in parallel with the lower die base.

[0012] According to the above-mentioned integrated lightweight stamped part for automobile body, the conductive coil, variable resistance rod, hydraulic cylinder and solenoid valve are all electrically connected to the PLC controller, and the circuit formed between the conductive coil, variable resistance rod, hydraulic cylinder, solenoid valve and PLC controller is electrically connected to an external power supply.

[0013] The stamping method for integrally formed lightweight stamped automotive body parts is as follows: S1. Pre-inspection of material loading: The lightweight sheet metal workpiece is placed above the main concave mold cavity. Before mold closing, the workpiece edge is squeezed to detect the thickness of the detection component. The conductive ring is driven to slide along the variable resistance rod by the inclined flat bottom detection block and the convex frame, and the workpiece thickness is converted into an electrical signal and transmitted to the PLC controller to complete the thickness adaptive detection.

[0014] S2. Parameter adaptive adjustment: The PLC controller receives the thickness signal and adjusts the hydraulic cylinder pressure of the elastic support component in conjunction with the workpiece to match the stamping buffer force of the corresponding workpiece. It also controls the opening of the solenoid valve of the mold cooling component in a synchronous manner to adjust the coolant flow rate and stabilize the working temperature of the mold.

[0015] S3, Integrated stamping: The upper die closes as it moves downward, and the main punch and main die work together to complete the integrated stamping of the workpiece. The ribs are formed simultaneously to reinforce the surface. The elastic support components provide stamping buffer, and the local forming components complete the local precise forming of the workpiece to avoid rigid breakage.

[0016] S4. Pressure Holding Temperature Control and Demolding: During the mold holding stage, the mold cooling components continuously control the temperature to prevent the workpiece from springing back and deforming. After the pressure holding is completed, the upper mold opens, the hydraulic cylinder drives the ejector pin to move upward, and automatically ejects the formed stamped part. Then the mold is reset to complete a single stamping cycle.

[0017] The technical solution provided by this invention has the following advantages compared with the known prior art: 1. This invention, through the use of a thickness detection component and an adaptive component, enables real-time detection of the thickness of the lightweight sheet metal to be stamped before mold closing. After the workpiece edge is pressed against the beveled flat-bottom detection block, the physical displacement of the thickness is converted into a resistance signal between the variable resistance rod and the conductive ring through mechanical transmission, which is synchronously transmitted to the PLC controller. This allows for rapid linkage adjustment of parameters such as stamping buffer force and cooling rate, adapting to variable cross-section sheets of different thicknesses. This solves the problem that existing molds cannot adaptively adjust according to sheet thickness and have poor versatility. It avoids uneven force, dimensional deviations, and localized damage caused by thickness deviations, significantly expanding the applicability of the device and meeting the common production needs of lightweight stamped parts of various specifications.

[0018] 2. This invention achieves one-time stamping and integrated forming of variable cross-section stamped parts through the setting of elastic support components and local forming components, avoiding the problems of material hardening and localized violent flow caused by secondary stamping. During the stamping process, the No. 3 spring, in conjunction with the hydraulic cylinder, provides flexible and adjustable buffer support force, controls the material flow path and stress distribution, avoids workpiece cracking caused by rigid stamping impact force, and effectively eliminates the hidden danger of stress concentration at the root of the reinforcing rib and the thickened area, preventing the generation of secondary tearing and scrap. After the mold is opened, the hydraulic cylinder can quickly drive the ejector column to smoothly eject the workpiece, realizing automatic demolding without the need for manual material handling, which reduces labor costs and avoids scratching the formed workpiece by manual demolding, thus comprehensively improving production efficiency and product qualification rate.

[0019] 3. This invention achieves closed-loop temperature control of the stamping die by using a mold cooling component in conjunction with a PLC controller to regulate the opening of the solenoid valve. Unlike traditional dies that lack temperature control and suffer from uncontrolled temperature rise, this invention features a serpentine cooling pipe layout that surrounds the forming cavity, increasing the cooling contact area and ensuring uniform and stable temperature throughout the die. The coolant flow rate can be matched to different sheet thicknesses to remove heat generated by stamping friction and deformation in real time, preventing the workpiece from experiencing thermal rebound and plastic deformation due to die temperature rise. This ensures the forming accuracy and dimensional stability of variable cross-section structures and reinforcing rib structures, further improving the structural strength and appearance regularity of the stamped parts and extending the service life of the die itself. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural schematic diagram from another perspective of the present invention; Figure 3 This is a three-dimensional structural schematic diagram of the present invention from another perspective; Figure 4 This is a three-dimensional structural cross-sectional diagram of the present invention; Figure 5 This is a three-dimensional structural schematic diagram of the mold cooling assembly of the present invention; Figure 6 for Figure 2 Enlarged view of point A in the middle; Figure 7 for Figure 2 Enlarged view of point B in the middle; Figure 8 for Figure 4 Enlarged view of point C in the middle; Figure 9 This is a schematic diagram of the stamping method of the present invention.

[0022] Figure reference numerals: 1. Upper mold part; 11. Upper mold base; 12. Main punch; 13. Rib profile; 2. Lower mold part; 21. Lower mold base; 22. Main die; 23. Cavity; 24. Elastic telescopic rod; 25. PLC controller; 3. Thickness detection component; 31. Through slot; 32. Columnar block; 33. Concave groove; 34. Convex slide bar; 35. C-shaped frame; 36. Base plate; 37. Spring No. 1; 38. Guide rod; 39. Spring No. 2; 310. Beveled flat bottom detection block; 4 41. Adaptive component; 42. C-shaped mounting base; 43. Variable resistance rod; 44. Conductive ring; 5. Connecting plate; 6. Partial forming component; 51. Cylindrical cavity; 52. Cylindrical groove; 53. Core column; 54. No. 1 circular plate; 55. Rectangular groove; 56. Ejector column; 7. Elastic support component; 61. Slide rod; 62. No. 2 circular plate; 63. No. 3 spring; 64. Hydraulic cylinder; 7. Mold cooling component; 71. Serpentine cooling pipe; 72. Liquid inlet pipe; 73. Liquid outlet pipe; 74. Solenoid valve. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0024] The present invention will be further described below with reference to embodiments.

[0025] Example: Refer to Figures 1 to 9 The integrated lightweight stamping part of the automobile body and the stamping method thereof include an upper die 1, the upper die 1 includes an upper die base 11 and a main punch 12 fixedly connected to the lower end face of the upper die base 11, and the lower end face of the main punch 12 is provided with a rib surface 13. The lower mold part 2 includes a lower mold base 21 and a main die 22 fixedly connected to the upper end face of the lower mold base 21. The main die 22 has a cavity 23 that matches the shape of the main punch 12. The lower mold part 2 and the upper mold part 1 are fixedly connected by a plurality of elastic telescopic rods 24. The stamping adaptive mechanism includes two thickness detection components 3, two adaptive components 4, one local forming component 5, one elastic support component 6, and two mold cooling components 7. The two thickness detection components 3 are symmetrically arranged on both sides of the cavity 23 and fixed on the upper end face of the lower mold base 21. They are used to detect the thickness of the workpiece to be stamped and transmit the thickness signal before mold closing. The two adaptive components 4 cooperate with the two thickness detection components 3 respectively and are electrically linked with the thickness detection components 3, the elastic support component 6, and the mold cooling components 7 respectively. The elastic support component 6 is fixedly arranged in the main die 22 and is used to elastically buffer and support the workpiece during the stamping process. When the mold opens, the workpiece is ejected and demolded. The local forming component 5 is fixedly arranged at the support end of the elastic support component 6. The two mold cooling components 7 are respectively arranged inside the main punch 12 and the main die 22 and are used to cool the mold in real time and maintain the mold working temperature stably. The thickness detection component 3 includes a through groove 31 formed on the side wall of the main die 22, a cylindrical block 32 slidably connected in the through groove 31, two concave grooves 33 formed on the side wall of the main die 22, a convex slide bar 34 slidably connected in each of the two concave grooves 33, a chamfered frame 35 fixedly connected between the side walls of the two convex slide bars 34, a base plate 36 fixedly connected to the bottom surface of the chamfered frame 35, and two No. 1 springs 37 fixedly connected between the base plate 36 and the upper surface of the lower die base 21. Two guide rods 38 are fixedly connected to the side wall of the cylindrical block 32. Both guide rods 38 are slidably connected to the side wall of the shaped frame 35. Two No. 2 springs 39 are fixedly connected between the cylindrical block 32 and the inner wall of the shaped frame 35. A beveled flat bottom detection block 310 is fixedly connected to the side wall of the cylindrical block 32 away from the shaped frame 35. The two No. 2 springs 39 are respectively sleeved on the two guide rods 38. The two guide rods 38 are arranged in parallel. Both base plates 36 are arranged in parallel with the lower mold base 21. A PLC controller 25 is fixedly installed on the side wall of the main die 22. The adaptive component 4 includes a C-shaped mounting base 41 fixedly connected to the upper surface of the lower die base 21. A variable resistance rod 42 is fixedly installed on the inner wall of the C-shaped mounting base 41. A conductive ring 43 is slidably sleeved on the variable resistance rod 42. A connecting plate 44 is fixedly connected to the side wall of the C-shaped frame 35. The side end of the connecting plate 44 is fixedly connected to the side wall of the conductive ring 43. The partial forming component 5 includes a cylindrical cavity 51 opened in the main die 22. A cylindrical groove 52 is opened on the inner bottom surface of the main die 22. The cylindrical groove 52 is connected to the cylindrical cavity 51. A core column 53 is slidably connected in the cylindrical groove 52. A first circular plate 54 is slidably connected in the cylindrical cavity 51. The core column 53 is fixedly connected to the upper surface of the first circular plate 54. A rectangular groove 55 is opened on the inner bottom surface of the main die 22. An ejector column 56 is fixedly connected to the top of the core column 53. The ejector column 56 cooperates with the rectangular groove 55. The elastic support assembly 6 includes a slide rod 61 fixedly connected to the bottom surface of the cylindrical cavity 51. The first circular plate 54, the core column 53, and the top column 56 are all slidably sleeved on the slide rod 61. The second circular plate 62 is slidably sleeved on the slide rod 61. A third spring 63 is fixedly connected between the first circular plate 54 and the second circular plate 62. Two hydraulic cylinders 64 are fixedly installed on the bottom surface of the cylindrical cavity 51. The output ends of the two hydraulic cylinders 64 are fixedly connected to the bottom surface of the second circular plate 62. The mold cooling assembly 7 includes a serpentine cooling pipe 71 disposed in the main punch 12. The input end and output end of the serpentine cooling pipe 71 are respectively fixedly connected to an inlet pipe 72 and an outlet pipe 73. A solenoid valve 74 is fixedly installed on the inlet pipe 72. The conductive coil 43, the variable resistance rod 42, the hydraulic cylinder 64 and the solenoid valve 74 are all electrically connected to the PLC controller 25. The circuit formed between the conductive coil 43, the variable resistance rod 42, the hydraulic cylinder 64, the solenoid valve 74 and the PLC controller 25 is electrically connected to an external power supply.

[0026] The working principle of the present invention is as follows: During stamping, the lightweight variable cross-section sheet metal workpiece to be processed is first placed stably in the positioning area above the cavity 23 of the main die 22. In the early stage of the die closing action, the edge of the sheet metal workpiece first contacts the inclined flat bottom detection block 310 of the thickness detection component 3. The inclined structure guides the sheet metal workpiece to press down smoothly, avoiding edge bumping and jamming. The weight of the sheet metal workpiece itself and the slight pressure of the pre-molding push the inclined flat-bottom detection block 310, along with the cylindrical block 32, towards the inside of the U-shaped frame 35, compressing the second spring 39 for flexible buffering. Simultaneously, the cylindrical block 32 drives the guide rod 38 to slide synchronously, ensuring stable displacement direction. As the cylindrical block 32 is subjected to force, the entire U-shaped frame 35 moves vertically downwards under the limiting and guiding action of the convex slide bar 34 and the concave groove 33. When the sheet metal workpiece passes the upper inclined edge and reaches the lower inclined edge, it presses against the inclined flat-bottom detection block 310, overcoming the elastic force of the first spring 37 and causing it to drive the U-shaped frame 35. 5 and the connecting plate 44 move upward, and under the action of the first spring 37, the flat bottom of the inclined flat bottom detection block 310 is always in contact with the upper surface of the plate, thereby completing the thickness detection. The shaped frame 35 drives the conductive ring 43 to slide up and down along the variable resistance rod 42 synchronously through the connecting plate 44. The difference in the thickness of the plate workpiece is converted into the displacement difference of the conductive ring 43, thereby changing the resistance value of the variable resistance rod 42 connected to the circuit, accurately converting the physical thickness signal into an electrical signal, and transmitting it to the PLC controller 25 in real time to complete the adaptive detection of the workpiece thickness before mold closing, providing data basis for subsequent parameter adjustment. After receiving the thickness electrical signal transmitted by the variable resistance rod 42, the PLC controller 25 realizes dual adaptive control of elastic support force and die temperature according to the preset matching logic between the sheet metal workpiece thickness and stamping parameters. First, start the hydraulic cylinder 64 and adjust the output oil pressure of the hydraulic cylinder 64 to control the initial lifting height of the second circular plate 62. Change the preload of the third spring 63 so that the elastic support force matches the thickness of the current plate workpiece. For plate workpieces with a larger thickness, increase the support buffer force accordingly, and for plate workpieces with a smaller thickness, decrease the support force accordingly to avoid local force imbalance. Secondly, control the solenoid valve 74 on the liquid inlet pipe 72, control the opening of the solenoid valve 74, and then adjust the flow rate of the coolant in the serpentine cooling pipe 71. In view of the characteristics of large heat dissipation requirements for thick plate stamping and stable temperature control requirements for thin plate stamping, the cooling efficiency is dynamically adjusted to stabilize the temperature of the main punch 12 and the main die 22 in the appropriate stamping process range in advance, thereby avoiding the workpiece deformation problem caused by mold temperature rise. After the parameters are adjusted, the external stamping equipment drives the upper die 1 to move downward as a whole. The elastic telescopic rod 24 contracts synchronously to guide and buffer, preventing the die from shifting. The main punch 12 gradually presses down on the sheet metal workpiece and cooperates with the cavity 23 of the main die 22. The overall shape of the workpiece, the local thickened area and the reinforcing rib structure are integrated and formed in one go. The rib surface 13 at the bottom of the main punch 12 is directly pressed to form the tall reinforcing rib, without the need for subsequent secondary stamping. During the stamping process, the No. 3 spring 63 of the elastic support component 6 continuously provides flexible buffering to offset the impact force of the rigid die closing, guide the sheet metal workpiece material to flow evenly, accurately control the material stress distribution, and avoid cracking caused by violent local material flow. The core pillar 53 and the top material pillar 56 of the local forming component 5 fit against the inner wall of the cavity 23 to complete the local precise forming of the workpiece. The top material pillar 56 is housed in the rectangular groove 55, which does not interfere with the overall forming accuracy. This allows for the simultaneous completion of large deformation basic forming and local thickening and high rib forming, and the controllable material flow path eliminates the hidden dangers of secondary tearing and stress concentration. After the mold is closed, it enters the pressure holding stage. The mold cooling component 7 continuously circulates coolant through the serpentine cooling pipe 71 to maintain a constant mold temperature, prevent the workpiece from experiencing thermal rebound and plastic deformation due to temperature fluctuations, and ensure the dimensional accuracy of the variable cross-section structure and reinforcing ribs. After the pressure holding time reaches the preset value, the upper mold part 1 moves upward to open the mold under the drive of the stamping equipment. The elastic telescopic rod 24 extends and resets synchronously. Through the No. 3 spring 63, it drives the No. 1 circular plate 54 and the core column 53 to rise vertically along the slide rod 61, thereby pushing the ejector column 56 to extend out of the rectangular groove 55 and smoothly lift the formed workpiece out of the main die cavity 22 cavity 23, completing the fully automatic demolding. After demolding, it waits for the next feeding and stamping, forming a complete closed-loop operation process.

[0027] The stamping method for integrally formed lightweight stamped automotive body parts is as follows: S1. Pre-inspection of material loading: The lightweight sheet metal workpiece is placed above the cavity 23 of the main die 22. Before the die is closed, the workpiece edge is squeezed by the thickness detection component 3. The conductive ring 43 is driven to slide along the variable resistance rod 42 through the inclined flat bottom detection block 310 and the convex frame 35, and the workpiece thickness is converted into an electrical signal and transmitted to the PLC controller 25 to complete the thickness adaptive detection.

[0028] S2. Parameter adaptive adjustment: The PLC controller 25 receives the thickness signal and adjusts the pressure of the hydraulic cylinder 64 of the elastic support component 6 in linkage to match the stamping buffer force of the corresponding workpiece. It also controls the opening of the solenoid valve 74 of the mold cooling component 7 in a synchronous manner to adjust the coolant flow rate and stabilize the working temperature of the mold.

[0029] S3, Integrated stamping: The upper die 1 moves downward to close the die, the main punch 12 and the main die 22 cooperate to complete the integrated stamping of the workpiece, the rib surface 13 is formed to form reinforcing ribs at the same time, the elastic support component 6 realizes the stamping buffer, and the local forming component 5 completes the local precise forming of the workpiece to avoid rigid damage.

[0030] S4. Pressure Holding and Temperature Control and Demolding: During the mold holding stage, the mold cooling component 7 continuously controls the temperature to prevent the workpiece from springing back and deforming. After the pressure holding is completed, the upper mold part 1 opens, the hydraulic cylinder 64 drives the ejector column 56 to move upward, and automatically ejects the formed stamped part. Then the mold is reset to complete a single stamping cycle.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A one-piece molded lightweight stamped part for automotive body and its stamping method, characterized in that, include: The upper mold (1) includes an upper mold base (11) and a main punch (12) fixedly connected to the lower end face of the upper mold base (11). The lower end face of the main punch (12) is provided with a rib profile (13). The lower mold (2) includes a lower mold base (21) and a main die (22) fixedly connected to the upper end face of the lower mold base (21). The main die (22) has a cavity (23) that matches the shape of the main punch (12). The lower mold (2) and the upper mold (1) are fixedly connected by a plurality of elastic telescopic rods (24). The stamping adaptive mechanism includes two thickness detection components (3), two adaptive components (4), a local forming component (5), an elastic support component (6), and two mold cooling components (7). The two thickness detection components (3) are symmetrically arranged on both sides of the cavity (23) and fixed on the upper end face of the lower mold base (21). They are used to detect the thickness of the workpiece to be stamped and transmit the thickness signal before mold closing. The two adaptive components (4) cooperate with the two thickness detection components (3) respectively and are electrically linked with the thickness detection component (3), the elastic support component (6), and the mold cooling component (7) respectively. The elastic support component (6) is fixedly arranged in the main die (22) and is used to elastically buffer and support the workpiece during the stamping process. When the mold is opened, the workpiece is ejected and demolded. The local forming component (5) is fixedly arranged at the support end of the elastic support component (6). The two mold cooling components (7) are respectively arranged inside the main punch (12) and the main die (22) and are used to cool the mold in real time and maintain the mold working temperature stably.

2. The integrated lightweight stamped part for automobile body and its stamping method according to claim 1, characterized in that, The thickness detection component (3) includes a through groove (31) on the side wall of the main die (22), a cylindrical block (32) is slidably connected in the through groove (31), two concave grooves (33) are opened on the side wall of the main die (22), a convex slide bar (34) is slidably connected in each of the two concave grooves (33), a U-shaped frame (35) is fixedly connected between the side walls of the two convex slide bars (34), and a base plate (36) is fixedly connected to the bottom surface of the U-shaped frame (35). 6) Two No. 1 springs (37) are fixedly connected to the upper surface of the lower mold base (21). Two guide rods (38) are fixedly connected to the side wall of the cylindrical block (32). Both guide rods (38) are slidably connected to the side wall of the shaped frame (35). Two No. 2 springs (39) are fixedly connected between the cylindrical block (32) and the inner wall of the shaped frame (35). A slanted flat bottom detection block (310) is fixedly connected to the side wall of the cylindrical block (32) away from the shaped frame (35).

3. The integrated lightweight stamped part for automobile body and its stamping method according to claim 2, characterized in that, The main die (22) is fixedly mounted with a PLC controller (25) on its side wall. The adaptive component (4) includes a C-shaped mounting base (41) fixedly connected to the upper surface of the lower die base (21). A variable resistance rod (42) is fixedly mounted on the inner wall of the C-shaped mounting base (41). A conductive ring (43) is slidably sleeved on the variable resistance rod (42). A connecting plate (44) is fixedly connected to the side wall of the C-shaped frame (35). The side end of the connecting plate (44) is fixedly connected to the side wall of the conductive ring (43).

4. The integrated lightweight stamped part for automobile body and its stamping method according to claim 3, characterized in that, The partial forming component (5) includes a cylindrical cavity (51) opened in the main die (22). The inner bottom surface of the main die (22) is provided with a cylindrical groove (52). The cylindrical groove (52) is connected to the cylindrical cavity (51). A core column (53) is slidably connected in the cylindrical groove (52). A first circular plate (54) is slidably connected in the cylindrical cavity (51). The core column (53) is fixedly connected to the upper surface of the first circular plate (54). A rectangular groove (55) is opened in the inner bottom surface of the main die (22). A top ejector column (56) is fixedly connected to the top of the core column (53). The top ejector column (56) cooperates with the rectangular groove (55).

5. The integrated lightweight stamped part for automobile body and its stamping method according to claim 4, characterized in that, The elastic support assembly (6) includes a slide rod (61) fixedly connected to the bottom surface of the cylindrical cavity (51). The first circular plate (54), the core column (53) and the top column (56) are all slidably sleeved on the slide rod (61). The second circular plate (62) is slidably sleeved on the slide rod (61). The first circular plate (54) and the second circular plate (62) are fixedly connected to the third spring (63). The bottom surface of the cylindrical cavity (51) is fixedly equipped with two hydraulic cylinders (64). The output ends of the two hydraulic cylinders (64) are fixedly connected to the bottom surface of the second circular plate (62).

6. The integrated lightweight stamped part for automobile body and its stamping method according to claim 5, characterized in that, The mold cooling assembly (7) includes a serpentine cooling pipe (71) disposed in the main punch (12). The input end and output end of the serpentine cooling pipe (71) are respectively fixedly connected to an inlet pipe (72) and an outlet pipe (73). A solenoid valve (74) is fixedly installed on the inlet pipe (72).

7. The integrated lightweight stamped part for automobile body and its stamping method according to claim 2, characterized in that, The two springs (39) are respectively sleeved on the two guide rods (38), the two guide rods (38) are arranged in parallel, and the two base plates (36) are arranged in parallel with the lower mold base (21).

8. The integrated lightweight stamped part for automobile body and its stamping method according to claim 6, characterized in that, The conductive coil (43), the variable resistance rod (42), the hydraulic cylinder (64), and the solenoid valve (74) are all electrically connected to the PLC controller (25), and the circuit formed between the conductive coil (43), the variable resistance rod (42), the hydraulic cylinder (64), the solenoid valve (74), and the PLC controller (25) is electrically connected to an external power supply.

9. A stamping method for an integrally formed lightweight stamped part for an automobile body according to any one of claims 1-8, characterized in that, The specific method is as follows: S1. Pre-inspection of material loading: The lightweight sheet metal workpiece is placed above the cavity (23) of the main die (22). Before the die is closed, the workpiece edge is squeezed by the thickness detection component (3). The conductive ring (43) is driven to slide along the variable resistance rod (42) by the inclined flat bottom detection block (310) and the shaped frame (35). The workpiece thickness is converted into an electrical signal and transmitted to the PLC controller (25) to complete the thickness adaptive detection. S2. Parameter adaptive adjustment: The PLC controller (25) receives the thickness signal and adjusts the pressure of the hydraulic cylinder (64) of the elastic support component (6) in linkage, matching the stamping buffer force of the corresponding workpiece, and synchronously controlling the opening of the solenoid valve (74) of the mold cooling component (7), adjusting the flow rate of the coolant, and stabilizing the working temperature of the mold. S3, Integrated stamping: The upper die (1) moves down to close the die, the main punch (12) and the main die (22) work together to complete the integrated stamping of the workpiece, the rib surface (13) is formed to reinforce the ribs, the elastic support component (6) realizes the stamping buffer, and the local forming component (5) completes the local precise forming of the workpiece to avoid rigid damage. S4. Pressure holding and temperature control and demolding: During the mold holding stage, the mold cooling component (7) continuously controls the temperature to prevent the workpiece from springing back and deforming. After the pressure holding is completed, the upper mold part (1) opens the mold, the hydraulic cylinder (64) drives the ejector column (56) to move upward, automatically ejecting the formed stamped part, and then the mold is reset to complete a single stamping cycle.

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