Preparation method of automobile door ring, automobile door ring and automobile

Abstract

The invention discloses a preparation method of an automobile door ring, the automobile door ring and an automobile, and the preparation method of the automobile door ring comprises the following steps: sequentially welding an A column roof side rail reinforcing plate, an A column reinforcing plate, a threshold reinforcing plate, a B column reinforcing plate and a side wall upper reinforcing plate to form an annular plate blank; the annular plate blank is subjected to cold stamping forming, and the automobile door ring is obtained; wherein the A-pillar roof side rail reinforcing plate and the B-pillar reinforcing plate are prepared from hot forming blanks, and the A-pillar reinforcing plate, the doorsill reinforcing plate and the side wall upper reinforcing plate are prepared from cold forming blanks. According to the automobile door ring, the light weight requirement and the deformation energy absorption requirement can be met by using the cold blank and the hot blank in a combined mode, the door ring blank obtained through welding can be formed through cold stamping, a roller hearth heating furnace and a complex hot forming die with a water channel for cooling do not need to be additionally used, production line investment is saved, and good economic benefits are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts manufacturing, and in particular to a method for preparing an automobile door knocker, an automobile door knocker and an automobile. Background Art

[0002] Nowadays, with the increasingly serious environmental problems, vehicle emission regulations are becoming more and more stringent. In order to achieve the needs of energy conservation and emission reduction, the requirements for lightweighting in the vehicle manufacturing process are becoming higher and higher. While lightweighting the vehicle, it is also necessary to ensure the safety of the vehicle and meet various collision performance index requirements.

[0003] In order to achieve lightweight and ensure the safety of the entire vehicle, automobile door rings usually use one-piece laser-welded hot-formed door rings. During the preparation process of this type of door ring, it is first necessary to laser-weld multiple hot-formed blanks to obtain door ring blanks, and then hot-stamp the door ring blanks to obtain the finished door rings. In the process of hot stamping the automobile door ring, the door ring blank must first be heated, and then sent into a mold with a cooling system for stamping and cooling. A roller bottom heating furnace and a hot forming mold with water channel cooling are required, and the production line investment is relatively large. At the same time, after hot stamping, further softening treatment will be carried out for areas with higher deformation energy absorption requirements to improve the collapse energy absorption effect. The process is complex and the manufacturing cost is high. Summary of the invention

[0004] The embodiment of the present invention provides a method for preparing an automobile door knocker, an automobile door knocker and an automobile, so as to solve the problems of complex process and high manufacturing cost in the preparation process of the existing automobile door knocker.

[0005] An embodiment of the present invention provides a method for preparing an automobile door knocker, comprising:

[0006] The A-pillar upper side beam reinforcement plate, the A-pillar reinforcement plate, the door sill reinforcement plate, the B-pillar reinforcement plate and the side panel upper reinforcement plate are welded in sequence to form an annular slab;

[0007] Cold stamping the annular plate blank to obtain an automobile door ring;

[0008] Among them, the A-pillar upper side beam reinforcement plate and the B-pillar reinforcement plate are prepared from hot-formed blanks, and the A-pillar reinforcement plate, the door sill reinforcement plate and the side panel upper reinforcement plate are prepared from cold-formed blanks.

[0009] Preferably, the cold stamping of the annular plate blank to obtain the automobile door knocker comprises:

[0010] Cold stamping the annular plate blank to obtain a first door ring;

[0011] The hot-formed area in the first door ring is quenched to obtain an automobile door ring containing a martensitic structure.

[0012] Preferably, the thermoforming area is an area where at least one of the A-pillar upper side beam reinforcement plate and the B-pillar reinforcement plate is located;

[0013] The step of quenching the hot-formed area in the first door ring to obtain the automobile door ring containing a martensitic structure comprises:

[0014] Performing a heating treatment on the thermoforming area in the first door ring to obtain a measured temperature corresponding to the thermoforming area;

[0015] When the measured temperature reaches the preset temperature, the hot forming area is cooled to obtain an automobile door knocker containing a martensite structure.

[0016] Preferably, after obtaining the automobile door knocker containing martensite structure, the method for preparing the automobile door knocker further comprises:

[0017] When the hot-formed blank is coated steel, cutting the automobile door ring containing martensite structure;

[0018] When the hot-formed blank is non-coated steel, the automobile door ring containing martensite structure is cut and shot blasted.

[0019] Preferably, before the A-pillar upper beam reinforcement plate, the A-pillar reinforcement plate, the door sill reinforcement plate, the B-pillar reinforcement plate and the side panel upper reinforcement plate are sequentially welded to form an annular slab, the method for preparing the automobile door ring further comprises:

[0020] Conduct simulation analysis on automobile door knockers to determine the material selection data corresponding to the blanks;

[0021] Performing forming simulation analysis on the material selection data corresponding to the blank to determine the shape data and welding data corresponding to the blank;

[0022] Based on the shape data and welding data corresponding to the blank, the blank is blanked to obtain a target plate, which includes at least one of an A-pillar upper beam reinforcement plate, an A-pillar reinforcement plate, a door sill reinforcement plate, a B-pillar reinforcement plate and a side panel upper reinforcement plate.

[0023] Preferably, the simulation analysis of the automobile door knocker to determine the material selection data corresponding to the blank includes:

[0024] Conduct simulation analysis on the automobile door knocker to determine the first material selection data corresponding to the hot forming blank;

[0025] The forming simulation analysis is performed on the material selection data corresponding to the blank to determine the shape data and welding data corresponding to the blank, including:

[0026] Performing a forming simulation analysis on the first material selection data corresponding to the thermoforming blank to determine the first shape data and the first welding data corresponding to the thermoforming blank;

[0027] The blanking process is performed on the blank based on the shape data and welding data corresponding to the blank to obtain the target plate, including:

[0028] Based on the first shape data and the first welding data corresponding to the hot forming blank, the hot forming blank is subjected to blanking processing to obtain at least one of the A-pillar upper side beam reinforcement plate and the B-pillar reinforcement plate.

[0029] Preferably, the simulation analysis of the automobile door knocker to determine the material selection data corresponding to the blank includes:

[0030] Conduct simulation analysis on the automobile door knocker to determine the second material selection data corresponding to the cold-formed blank;

[0031] The forming simulation analysis is performed on the material selection data corresponding to the blank to determine the shape data and welding data corresponding to the blank, including:

[0032] Performing a forming simulation analysis on the second material selection data corresponding to the cold-formed blank to determine the second shape data and the second welding data corresponding to the cold-formed blank;

[0033] According to the shape data and welding data corresponding to the blank, the blank is blanked to obtain the target plate, including:

[0034] Based on the second shape data and the second welding data corresponding to the cold-formed blank, the cold-formed blank is subjected to blanking processing to obtain at least one of the A-pillar reinforcement plate, the rocker reinforcement plate and the side panel upper reinforcement plate.

[0035] The embodiment of the present invention further provides an automobile door ring, the automobile door ring comprising an A-pillar upper side beam reinforcement plate and a B-pillar reinforcement plate made of hot-formed blanks, and the A-pillar reinforcement plate, the door sill reinforcement plate and the side panel upper reinforcement plate made of cold-formed blanks;

[0036] The A-pillar upper beam reinforcement plate, the A-pillar reinforcement plate, the door sill reinforcement plate, the B-pillar reinforcement plate and the side panel upper reinforcement plate are welded in sequence to form a ring structure.

[0037] Preferably, the A-pillar upper side beam reinforcement plate and the B-pillar reinforcement plate include a martensitic structure formed by quenching.

[0038] Preferably, an electrophoresis hole is provided on the automobile door knocker.

[0039] Preferably, the thickness of the A-pillar upper beam reinforcement plate, the A-pillar reinforcement plate, the door sill reinforcement plate, the B-pillar reinforcement plate and the side panel upper reinforcement plate is 1.2-2.4 mm.

[0040] An embodiment of the present invention further provides a car, comprising any of the above-mentioned car door knockers.

[0041] The preparation method of the automobile door knocker, the automobile door knocker and the automobile provided by the embodiments of the present invention combine and weld a hot-formed blank with a cold-formed blank, and then cold-stamp the door knocker blank formed by welding into an integrated form. By combining the hot and cold blanks, it is possible to take into account both the lightweight requirements and the deformation energy absorption requirements, and the door knocker blank obtained by welding can also be formed by cold stamping. There is no need to additionally use a roller bottom heating furnace and a complex hot forming mold with water channel cooling, which saves production line investment and has good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0043] Figure 1 It is a schematic flow chart of a method for preparing an automobile door knocker in one embodiment of the present invention;

[0044] Figure 2 is another schematic flow chart of a method for preparing an automobile door knocker in one embodiment of the present invention;

[0045] Figure 3 is another schematic flow chart of a method for preparing an automobile door knocker in one embodiment of the present invention;

[0046] Figure 4 is another schematic flow chart of a method for preparing an automobile door knocker in one embodiment of the present invention;

[0047] Figure 5 is another schematic flow chart of a method for preparing an automobile door knocker in one embodiment of the present invention;

[0048] Figure 6 is another schematic flow chart of a method for preparing an automobile door knocker in one embodiment of the present invention;

[0049] Figure 7 is another schematic flow chart of a method for preparing an automobile door knocker in one embodiment of the present invention;

[0050] Figure 8 It is a schematic structural diagram of a car door knocker in one embodiment of the present invention.

[0051] In the figure: 1. A-pillar upper beam reinforcement plate; 2. A-pillar reinforcement plate; 3. Door sill reinforcement plate; 4. B-pillar reinforcement plate; 5. Side panel upper reinforcement plate. DETAILED DESCRIPTION

[0052] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0053] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] An embodiment of the present invention provides a method for preparing an automobile door knocker, comprising:

[0056] S101: welding the A-pillar upper beam reinforcement plate, the A-pillar reinforcement plate, the door sill reinforcement plate, the B-pillar reinforcement plate and the side panel upper reinforcement plate in sequence to form an annular slab;

[0057] S102: cold stamping the annular plate blank to obtain an automobile door ring;

[0058] Among them, the A-pillar upper beam reinforcement plate 1 and the B-pillar reinforcement plate 4 are prepared from hot-formed blanks, and the A-pillar reinforcement plate 2, the door sill reinforcement plate 3 and the side panel upper reinforcement plate 5 are prepared from cold-formed blanks.

[0059] Among them, the A-pillar upper side beam reinforcement plate 1, the A-pillar reinforcement plate 2, the door sill reinforcement plate 3, the B-pillar reinforcement plate 4 and the side panel upper reinforcement plate 5 are five different plates in the automobile side panel reinforcement structure. The A-pillar reinforcement plate 2 is located on the front pillar of the vehicle, the B-pillar reinforcement plate 4 is located on the center pillar of the vehicle, the door sill reinforcement plate 3 is located at the front door sill of the vehicle, the A-pillar upper side beam reinforcement plate 1 is located between the A-pillar reinforcement plate 2 and the B-pillar reinforcement plate 4, and the side panel upper reinforcement plate 5 connects the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4.

[0060] Among them, the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4 are preferably made of 1000MPa, 1500MPa or 2000MPa grade hot-formed blanks, which are lighter in weight at the same strength, and are beneficial to the lightweight of the automobile side reinforcement structure.

[0061] Among them, the A-pillar reinforcement plate 2, the door sill reinforcement plate 3 and the side upper reinforcement plate 5 are preferably made of high-strength cold-formed blanks such as HC420 / 780DP, HC550 / 980DP, HC550 / 980QP, HC820 / 1180DP, HC950 / 1180MS, which are conducive to collision collapse energy absorption, meet the buffer performance requirements, and do not require additional softening processes, which is helpful to improve the side collision and small-angle offset collision performance. In order to prevent the performance difference from being too large, the performance of the selected cold-formed blank is close to the cold performance of the hot-formed blank.

[0062] As an example, in step S101, the A-pillar upper side beam reinforcement plate 1, the A-pillar reinforcement plate 2, the door sill reinforcement plate 3, the B-pillar reinforcement plate 4 and the side panel upper reinforcement plate 5 can be laser welded in a counterclockwise or clockwise direction starting from the A-pillar upper side beam reinforcement plate 1 according to the distribution of each reinforcement plate in the automobile side panel reinforcement structure, and the A-pillar upper side beam reinforcement plate 1, the A-pillar reinforcement plate 2, the door sill reinforcement plate 3, the B-pillar reinforcement plate 4 and the side panel upper reinforcement plate 5 are sequentially connected to finally form an annular slab. In this example, the combination of hot-formed blanks and cold-formed blanks can give full play to the characteristics of different types of materials and have a good molding surface quality; the use of laser welding can make the overlap between the two slabs without overlapping, saving materials and further improving the lightweight effect.

[0063] As an example, in step S102, at room temperature, the welded annular plate blank is transferred to a mold for integrated cold stamping to obtain an automobile door ring. In this example, the annular plate blank formed after welding is subjected to integrated cold stamping, which can reduce the number of stamping times, and the cold forming method does not require the use of an additional roller bottom heating furnace and a complex hot forming mold with water channel cooling, which helps to save production line investment and reduce manufacturing costs.

[0064] In this embodiment, the hot-formed blank and the cold-formed blank are welded together, and then the door ring blank formed by welding is cold stamped into an integrated form. By combining the hot and cold blanks, the characteristics of different types of materials can be fully utilized, and both lightweight requirements and deformation energy absorption requirements can be taken into account. The door ring blank obtained by welding can also be formed by cold stamping, without the need for additional roller bottom heating furnaces and complex hot forming molds with water channel cooling, which saves production line investment, has good economic benefits, and can effectively reduce manufacturing costs.

[0065] In one embodiment, if Figure 2 As shown, step S102, i.e., cold stamping the annular plate blank to obtain the automobile door ring, comprises:

[0066] S201: cold stamping the annular plate blank to obtain a first door ring;

[0067] S202: performing quenching treatment on the hot-formed area in the first door ring to obtain an automobile door ring containing a martensitic structure.

[0068] Among them, the first door ring is a door ring obtained by cold stamping an annular plate blank.

[0069] As an example, in step S201, at room temperature, the welded annular slab is transferred to a mold for integrated cold stamping to obtain a first door ring. Specifically, according to the pre-designed number and position of electrophoresis holes, a specific stamping die can be used to complete the punching process of the annular slab during cold stamping, thereby improving the subsequent coating quality and ensuring the sealing and protection of the coating surface. Integrated cold stamping of the welded annular slab can reduce the number of stamping times, and the cold forming method does not require the use of additional roller bottom heating furnaces and complex hot forming molds with water channel cooling, which helps save production line investment and reduce manufacturing costs.

[0070] Among them, quenching is a heat treatment process. The quenching of steel is a heat treatment process in which the steel is heated to a critical temperature and kept at a temperature for a period of time to make it fully or partially austenitized, and then cooled at a cooling rate greater than the critical cooling rate to convert the austenite into martensite (or bainite). Austenite is a lamellar microstructure of steel. The austenite structure has good plasticity, low strength, and certain toughness. Martensite is the name of a structure of ferrous metal materials with high strength and hardness.

[0071] The hot forming area includes an area in the first door ring that is prepared from a hot forming blank, and specifically may be an area where at least one of the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4 is located.

[0072] As an example, in step S202, the hot forming area in the first door ring is quenched to obtain a car door ring with a higher strength containing a martensitic structure. In this example, when the B-pillar reinforcement plate 4 is a hot forming area, the B-pillar reinforcement plate 4 in the first door ring can be first heated by laser or electromagnetic induction, and after reaching the critical temperature, it is kept warm for a period of time to make the B-pillar reinforcement plate 4 fully or partially austenitized, and then sprayed with water at a cooling rate greater than the critical cooling rate (such as 30°C / S) to convert the austenite structure in the B-pillar reinforcement plate 4 into a martensite structure, so that the strength of the B-pillar reinforcement plate 4 is improved, and a car door ring with a higher strength containing a martensitic structure is obtained.

[0073] In this example, the hot forming area may be the area where the A-pillar upper side beam reinforcement plate 1 and / or the B-pillar reinforcement plate 4 are located, which requires higher strength material properties to meet corresponding collision requirements. The hot forming area is heated by laser or electromagnetic induction and rapidly cooled to obtain a martensitic structure, which can quickly improve the material strength of the hot forming area without the need for an additional roller bottom heating furnace, saving production space.

[0074] In one embodiment, the hot forming area is the area where at least one of the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4 is located. Figure 3 As shown, step S202, i.e., quenching the hot-formed area in the first door ring to obtain an automobile door ring containing a martensitic structure, comprises:

[0075] S301: performing a heating treatment on the thermoforming area in the first door ring to obtain a measured temperature corresponding to the thermoforming area;

[0076] S302: When the measured temperature reaches the preset temperature, the hot forming area is cooled to obtain an automobile door knocker containing a martensite structure.

[0077] Among them, the preset temperature is a pre-set temperature used to evaluate whether the cooling conditions are met, which can be determined based on the blank thickness and collision strength requirements of the hot forming area. For example, it can be determined based on the blank thickness and collision strength requirements of the A-pillar upper side beam reinforcement plate 1 and / or the B-pillar reinforcement plate 4.

[0078] As an example, in step S301, a heat treatment is performed from top to bottom on at least one of the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4 in the first door ring by laser or electromagnetic induction, and the measured temperature of the heat-formed area after being heated is measured in real time. In the actual heating treatment process, when the A-pillar upper side beam reinforcement plate 1 is heated, the A-pillar upper side beam reinforcement plate 1 in the first door ring can be heated from the connection between the A-pillar upper side beam reinforcement plate 1 and the side panel upper reinforcement plate 5, and the first measured temperature of the A-pillar upper side beam reinforcement plate 1 after being heated is measured in real time; when the B-pillar reinforcement plate 4 is heated, the B-pillar reinforcement plate 4 in the first door ring can be heated from the connection between the B-pillar reinforcement plate 4 and the side panel upper reinforcement plate 5, and the second measured temperature of the heat-formed area after being heated is measured in real time.

[0079] As an example, in step S302, when the measured temperature reaches the preset temperature, it can be determined that the heated hot forming area is partially / completely austenitized. At this time, the temperature of the heated hot forming area meets the cooling conditions, and the area needs to be sprayed with water to cool it rapidly at a cooling rate greater than the critical cooling rate, so that the austenite structure is completely / partially transformed into the martensite structure.

[0080] For example, when the measured temperature of the A-pillar upper side beam reinforcement plate 1 that has been heated reaches the first preset temperature (such as 870°C), and the blank structure at the A-pillar upper side beam reinforcement plate 1 is completely / partially austenitized, the A-pillar upper side beam reinforcement plate 1 is sprayed with water to cool it rapidly at a cooling rate greater than the first critical cooling rate (such as 30°C / S), and the austenite structure in the A-pillar upper side beam reinforcement plate 1 is completely / partially transformed into the martensite structure. The first preset temperature and the first critical cooling rate can be determined according to the blank thickness and collision strength requirements of the A-pillar upper side beam reinforcement plate 1.

[0081] For another example, when the measured temperature of the heated B-pillar reinforcement plate 4 reaches the second preset temperature (e.g., 870°C), and the blank structure at the B-pillar reinforcement plate 4 is completely / partially austenitized, the B-pillar reinforcement plate 4 is sprayed with water for cooling, so that the B-pillar reinforcement plate 4 is rapidly cooled at a cooling rate greater than the second critical cooling rate (e.g., 30°C / S), and the austenite structure in the B-pillar reinforcement plate 4 is completely / partially transformed into the martensite structure. The second preset temperature and the second critical cooling rate can be determined according to the blank thickness of the B-pillar reinforcement plate 4 and the collision strength requirements.

[0082] In this example, by heating the A-pillar upper side beam reinforcement plate 1 and / or the B-pillar reinforcement plate 4 by laser or electromagnetic induction and rapidly cooling them to obtain a martensitic structure, the material strength of the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4 can be quickly improved to meet the corresponding collision requirements without the need for an additional roller bottom heating furnace, thereby saving production space.

[0083] In one embodiment, if Figure 4 As shown, in step S202, i.e., after obtaining the automobile door knocker containing martensite structure, the method for preparing the automobile door knocker further includes:

[0084] S401: When the hot-formed blank is coated steel, the automobile door ring containing martensite structure is cut;

[0085] S402: When the hot-formed blank is non-coated steel, the automobile door ring containing martensite structure is cut and shot blasted.

[0086] The coated steel may be aluminum-silicon coated hot-formed steel coated with alloy elements such as Fe, Zn, Al, and Si.

[0087] As an example, when the hot-formed blanks at the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4 are selected as coated steel, after the hot-formed area is quenched to obtain a car door ring with a higher strength containing a martensitic structure, the car door ring is further cut to remove the excess material. When the hot-formed blanks at the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4 are non-coated steel, since the non-coated steel will have an oxide layer after quenching, which affects the subsequent painting, after the hot-formed area is quenched to obtain a car door ring with a higher strength containing a martensitic structure, the car door ring needs to be shot blasted to remove the oxide layer. Since shot blasting will have a certain impact on the dimensional accuracy of the car door ring, in order to ensure the accuracy of the electrophoresis hole opening, shot blasting can be performed after cutting.

[0088] In one embodiment, if Figure 5 As shown, in step S101, before sequentially welding the A-pillar upper side beam reinforcement plate, the A-pillar reinforcement plate, the door sill reinforcement plate, the B-pillar reinforcement plate and the side panel upper reinforcement plate to form an annular slab, the method for preparing the automobile door ring further includes:

[0089] S501: Perform simulation analysis on the automobile door knocker to determine the material selection data corresponding to the blank;

[0090] S502: Performing forming simulation analysis on the material selection data corresponding to the blank to determine the shape data and welding data corresponding to the blank;

[0091] S503: Based on the shape data and welding data corresponding to the blank, the blank is blanked to obtain a target plate, which includes at least one of an A-pillar upper beam reinforcement plate, an A-pillar reinforcement plate, a door sill reinforcement plate, a B-pillar reinforcement plate and a side panel upper reinforcement plate.

[0092] Among them, simulation analysis is CAE (Computer Aided Engineering) analysis, which uses computer-aided analysis to analyze the structural mechanical properties of complex projects and products, as well as optimize structural performance, to organically organize all aspects of engineering (production). Specifically, it can include static structural analysis, dynamic analysis, and can study linear and nonlinear problems, analyze structures (solids), fluids, and electromagnetics.

[0093] The material selection data includes but is not limited to data such as blank selection and blank thickness.

[0094] As an example, in step S501, simulation analysis is performed based on the entire process of automobile door ring preparation, collision energy absorption requirements, lightweight requirements, and raw material utilization, etc., to determine the material selection data corresponding to each part of the blank. For example, according to the simulation analysis results, it is determined that the A-pillar upper side beam reinforcement plate 1 is preferably made of a 1500+AS model hot-formed blank with a thickness of 1.5 mm, and the B-pillar reinforcement plate 4 is preferably made of a 1500+AS model hot-formed blank with a thickness of 1.6 mm.

[0095] The forming simulation analysis can also be a CAE analysis. The shape data includes the corresponding blanking shapes of the A-pillar upper side beam reinforcement plate 1, the A-pillar reinforcement plate 2, the door sill reinforcement plate 3, the B-pillar reinforcement plate 4, and the side panel upper reinforcement plate 5, and the blanking layout of the blanking shape on the blank sheet. The welding data includes the number of welds, the direction of the welds, and the position of the welds.

[0096] As an example, in step S502, based on the material selection data corresponding to the blank, the collision energy absorption requirements, the lightweight requirements, and the raw material utilization rate, a forming simulation analysis is performed to determine the shape data and welding data corresponding to the blank. For example, according to the forming simulation analysis, the blanking shape corresponding to the A-pillar upper side beam reinforcement plate 1 and the blanking layout of the blanking shape on the hot-formed blank corresponding to the A-pillar upper side beam reinforcement plate 1 are determined; the number of welds is determined to be 5.

[0097] The target plate is a plate obtained by blanking the selected blank.

[0098] As an example, in step S503, based on the acquired shape data and welding data, the selected blank is blanked to obtain a target plate, which may be at least one of the A-pillar upper side beam reinforcement plate 1, the A-pillar reinforcement plate 2, the door sill reinforcement plate 3, the B-pillar reinforcement plate 4, and the side panel upper reinforcement plate 5. For example, the hot-formed blank corresponding to the selected A-pillar upper side beam reinforcement plate 1 is blanked to obtain the A-pillar upper side beam reinforcement plate 1.

[0099] In this example, a simulation analysis is performed on the automobile door knocker to obtain data such as the selection and thickness of the blank. This can balance the collision energy absorption and lightweight requirements of the automobile door knocker, determine the feasibility of stamping each part, and reduce the number of mold debugging times. A forming simulation analysis is performed on the material selection data corresponding to the blank, which can optimize the blanking layout and weld layout and improve material utilization.

[0100] In one embodiment, if Figure 6 As shown, the preparation method of the automobile door knocker also includes:

[0101] S601: Perform simulation analysis on the automobile door knocker to determine first material selection data corresponding to the hot forming blank;

[0102] S602: Performing a forming simulation analysis on the first material selection data corresponding to the thermoforming blank to determine the first shape data and the first welding data corresponding to the thermoforming blank;

[0103] S603: Based on the first shape data and the first welding data corresponding to the hot-formed blank, the hot-formed blank is blanked to obtain at least one of the A-pillar upper side beam reinforcement plate and the B-pillar reinforcement plate.

[0104] Among them, step S601 is a specific implementation of step S501, step S602 is a specific implementation of step S502, and step S603 is a specific implementation of step S503.

[0105] As an example, in step S601, simulation analysis is performed based on the entire process of door ring preparation, collision energy absorption requirements, lightweight requirements, and raw material utilization, and the first material selection data corresponding to the hot-formed blank is determined according to the simulation analysis results. For example, according to the simulation analysis results, it is determined that the A-pillar upper side beam reinforcement plate 1 is preferably made of a 1500+AS hot-formed blank with a thickness of 1.5 mm, and the B-pillar reinforcement plate 4 is preferably made of a 1500+AS hot-formed blank with a thickness of 1.6 mm.

[0106] As an example, in step S602, based on the material selection data of the hot forming blank, the collision energy absorption requirements, the lightweight requirements and the raw material utilization rate, etc., a forming simulation analysis is performed to determine the first shape data and the first welding data corresponding to the hot forming blank. For example, according to the forming simulation analysis, the blanking shape corresponding to the A-pillar upper side beam reinforcement plate 1 and the blanking layout of the blanking shape on the hot forming blank corresponding to the A-pillar upper side beam reinforcement plate 1 are determined; in order to save material consumption and reduce the overlapped surface, it is determined that the number of welds is preferably 5.

[0107] As an example, in step S603, based on the acquired first shape data and first welding data, the selected hot-formed blank is blanked to obtain at least one of the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4, so as to obtain the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4 prepared from the hot-formed blank. For example, the hot-formed blank corresponding to the selected A-pillar upper side beam reinforcement plate 1 is blanked to obtain the A-pillar upper side beam reinforcement plate 1; the other hot-formed blank corresponding to the selected B-pillar reinforcement plate 4 is blanked to obtain the B-pillar reinforcement plate 4. In this example, the same hot-formed blank can be blanked to obtain the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4, or different hot-formed blanks can be blanked separately to obtain the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4, respectively.

[0108] In this example, a simulation analysis is performed on the automobile door ring, and data such as the selection and thickness of the hot-formed blanks corresponding to the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4 are preferably obtained, which can fully meet the material strength and lightweight requirements required for the automobile door ring, determine the feasibility of cold stamping of each part, and reduce the number of mold debugging times; a forming simulation analysis is performed on the material selection data corresponding to the hot-formed blanks, which can optimize the blanking layout and weld layout of the hot-formed blanks and improve material utilization.

[0109] In one embodiment, if Figure 7 As shown, the preparation method of the automobile door knocker also includes:

[0110] S701: Perform simulation analysis on the automobile door knocker to determine second material selection data corresponding to the cold-formed blank;

[0111] S702: Performing a forming simulation analysis on the second material selection data corresponding to the cold-formed blank to determine the second shape data and the second welding data corresponding to the cold-formed blank;

[0112] S703: Based on the second shape data and the second welding data corresponding to the cold-formed blank, the cold-formed blank is blanked to obtain at least one of the A-pillar reinforcement plate, the rocker reinforcement plate and the side panel upper reinforcement plate.

[0113] Among them, step S701 is a specific implementation of step S501, step S702 is a specific implementation of step S502, and step S703 is a specific implementation of step S503.

[0114] As an example, in step S701, simulation analysis is performed based on the entire process of door ring preparation, collision energy absorption requirements, lightweight requirements, and raw material utilization, and the second material selection data corresponding to the cold-formed blank is determined according to the simulation analysis results. For example, according to the simulation analysis results, it is determined that the A-pillar reinforcement plate 2 is preferably made of high-strength cold-formed blanks of HC420 / 780DP+ZF or HC340 / 590DP+ZF, with a blank thickness of 1.4mm; the door sill reinforcement plate 3 is preferably made of high-strength cold-formed blanks of HC420 / 780DP+ZF, with a blank thickness of 1.2mm; the side upper reinforcement plate 5 is preferably made of high-strength cold-formed blanks of HC420 / 780DP+ZF or HC340 / 590DP+ZF, with a blank thickness of 1.2mm.

[0115] As an example, in step S702, based on the material selection data of the hot-formed blank, the collision energy absorption requirements, the lightweight requirements, and the utilization rate of raw materials, a forming simulation analysis is performed to determine the second shape data and the second welding data corresponding to the cold-formed blank. For example, according to the forming simulation analysis, the blanking shape corresponding to the A-pillar reinforcement plate 2 and the blanking layout of the blanking shape on the cold-formed blank corresponding to the A-pillar reinforcement plate 2 are determined; the number of welds is preferably determined to be 5 to save material consumption and reduce overlapping surfaces.

[0116] As an example, in step S703, based on the acquired second shape data and second welding data, the selected cold-formed blank is blanked to obtain at least one of the A-pillar reinforcement plate 2, the rocker reinforcement plate 3, and the side panel upper reinforcement plate 5. For example, the cold-formed blank corresponding to the selected A-pillar reinforcement plate 2 is blanked to obtain the A-pillar reinforcement plate 2; and the other cold-formed blank corresponding to the selected rocker reinforcement plate 3 is blanked to obtain the rocker reinforcement plate 3. In this example, the same cold-formed blank can be blanked to obtain the A-pillar reinforcement plate 2, the rocker reinforcement plate 3, and the side panel upper reinforcement plate 5, or different cold-formed blanks can be blanked separately to obtain the A-pillar reinforcement plate 2, the rocker reinforcement plate 3, and the side panel upper reinforcement plate 5, respectively.

[0117] In this example, a simulation analysis is performed on the automobile door knocker, and data such as the selection and thickness of the cold-formed blanks corresponding to the A-pillar reinforcement plate 2, the door sill reinforcement plate 3 and the side panel upper reinforcement plate 5 are preferably obtained, which can fully meet the collision energy absorption requirements of the automobile door knocker, determine the feasibility of cold stamping of each part, and reduce the number of mold debugging times; a forming simulation analysis is performed on the material selection data corresponding to the cold-formed blank, which can optimize the blanking layout and weld layout of the cold-formed blank and improve material utilization.

[0118] An embodiment of the present invention also provides an automobile door ring, which includes an A-pillar upper side beam reinforcement plate 1 and a B-pillar reinforcement plate 4 made of hot-formed steel, and an A-pillar reinforcement plate 2, a door sill reinforcement plate 3 and a side panel upper reinforcement plate 5 made of cold-formed steel; the A-pillar upper side beam reinforcement plate 1, the A-pillar reinforcement plate 2, the door sill reinforcement plate 3, the B-pillar reinforcement plate 4 and the side panel upper reinforcement plate 5 are welded in sequence to form a ring structure.

[0119] As an example, the automobile door ring is obtained by cold stamping a ring-shaped plate blank. Figure 8 As shown, the annular plate blank includes an A-pillar upper side beam reinforcement plate 1 and a B-pillar reinforcement plate 4 made of hot-formed steel, and an A-pillar reinforcement plate 2, a door sill reinforcement plate 3, and a side panel upper reinforcement plate 5 made of cold-formed steel. The annular plate blank is formed by laser welding the A-pillar upper side beam reinforcement plate 1, the A-pillar reinforcement plate 2, the door sill reinforcement plate 3, the B-pillar reinforcement plate 4, and the side panel upper reinforcement plate 5 according to the distribution of each reinforcement plate in the automobile side panel reinforcement structure, starting from the A-pillar upper side beam reinforcement plate 1, in a counterclockwise or clockwise order.

[0120] In one embodiment, the A-pillar top rail reinforcement plate 1 and the B-pillar reinforcement plate 4 include a martensite structure formed by quenching.

[0121] As an example, martensite is the name of a structure of ferrous metal materials, which has high strength and hardness. The A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4 contain martensite structures. Specifically, the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4 can be heated to make the temperature of the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4 reach a critical temperature, and austenite structures are generated in the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4. Then, the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4 are cooled to convert the austenite structures in the A-pillar upper side beam reinforcement plate 1 and the B-pillar reinforcement plate 4 into martensite structures.

[0122] In one embodiment, an electrophoresis hole is provided on the automobile door knocker.

[0123] As an example, the car door knocker is also provided with electrophoretic holes, which are used to promote shrinkage during electrophoretic coating to remove air and volatile substances inside the electrophoretic paint, increase the density of the coating film and reduce the appearance of pores in the coating, ensure the sealing and protection of the coating surface, improve the coating quality, and make the surface smoother and more uniform. During the production process, the ring-shaped blank can be punched at the same time as the cold stamping molding according to the number and location of the electrophoretic holes designed in advance.

[0124] In one embodiment, the thickness of the A-pillar upper beam reinforcement plate 1, the A-pillar reinforcement plate 2, the door sill reinforcement plate 3, the B-pillar reinforcement plate 4 and the side panel upper reinforcement plate 5 is 1.2-2.4 mm.

[0125] As an example, the A-pillar upper side beam reinforcement plate 1, the A-pillar reinforcement plate 2, the door sill reinforcement plate 3, the B-pillar reinforcement plate 4 and the side panel upper reinforcement plate 5 are preferably made of 1.2-2.4mm thick hot-formed blanks. The selection of 1.2-2.4mm thick blanks can fully meet the strength requirements and shaping and bending energy absorption requirements of the vehicle side panel, while taking into account the lightweight effect of the vehicle. For example, the A-pillar upper side beam reinforcement plate 1 can be preferably made of 1500+AS model hot-formed blanks with a thickness of 1.5mm according to the specific simulation analysis situation, and the B-pillar reinforcement plate 4 can be preferably made of 1500+AS model hot-formed blanks with a thickness of 1.6mm according to the specific simulation analysis situation. In order to meet the requirements of collision energy absorption and plastic bending, so that each part of the automobile door ring produces an ideal collapse deformation during a collision and ensure the safety of the cabin to the greatest extent, the blank thickness and cold-formed blank selection of the A-pillar reinforcement plate 2, the door sill reinforcement plate 3 and the upper side reinforcement plate 5 can be differentiated in strength. For example, according to the specific simulation analysis results, the A-pillar reinforcement plate 2 can use a HC420 / 780DP+ZF model or a HC340 / 590DP+ZF model cold-formed blank with a blank thickness of 1.4 mm; the door sill reinforcement plate 3 can use a HC420 / 780DP+ZF model cold-formed blank with a blank thickness of 1.2 mm; the side upper reinforcement plate 5 can use a HC420 / 780DP+ZF model or a HC340 / 590DP+ZF model cold-formed blank with a blank thickness of 1.2 mm.

[0126] In one embodiment, the number of welds on the automobile door ring is 3-5.

[0127] As an example, the number of welds of the automobile door knocker can be 0-6, preferably 3-5, to save material usage and reduce overlap. Figure 8 As shown, there is a weld between the A-pillar upper side beam reinforcement plate 1 and the A-pillar reinforcement plate 2, between the A-pillar reinforcement plate 2 and the door sill reinforcement plate 3, between the door sill reinforcement plate 3 and the B-pillar reinforcement plate 4, between the B-pillar reinforcement plate 4 and the side panel upper reinforcement plate 5, and between the side panel upper reinforcement plate 5 and the A-pillar upper side beam reinforcement plate 1.

[0128] An embodiment of the present invention further provides a car, characterized in that it includes the car door knocker in any one of the above embodiments.

[0129] As an example, the door ring part of the car adopts the combination of hot-formed blanks and cold-formed blanks. The hot-formed blanks and the cold-formed blanks are laser welded, and then the welded door ring blank is cold-stamped into one-piece forming. By combining the use of hot and cold blanks, it is possible to take into account both lightweight requirements and deformation energy absorption requirements, and the door ring blank obtained by welding can also be formed by cold stamping. There is no need to use a roller bottom heating furnace and a complex hot forming mold with water channel cooling, which saves production line investment and has good economic benefits.

[0130] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for preparing a car door knocker, characterized in that: include: The A-pillar upper side beam reinforcement plate, the A-pillar reinforcement plate, the door sill reinforcement plate, the B-pillar reinforcement plate and the side panel upper reinforcement plate are welded in sequence to form an annular slab; Cold stamping the annular plate blank to obtain an automobile door ring; Among them, the A-pillar upper side beam reinforcement plate and the B-pillar reinforcement plate are prepared from hot-formed blanks, and the A-pillar reinforcement plate, the door sill reinforcement plate and the side panel upper reinforcement plate are prepared from cold-formed blanks.

2. The method for preparing a car door knocker according to claim 1, characterized in that: The method of cold stamping the annular plate blank to obtain the automobile door ring comprises: Cold stamping the annular plate blank to obtain a first door ring; The hot-formed area in the first door ring is quenched to obtain an automobile door ring containing a martensitic structure.

3. The method for preparing the automobile door knocker according to claim 2, characterized in that: The thermoforming area is an area where at least one of the A-pillar upper side beam reinforcement plate and the B-pillar reinforcement plate is located; The step of quenching the hot-formed area in the first door ring to obtain the automobile door ring containing a martensitic structure comprises: Performing a heating treatment on the thermoforming area in the first door ring to obtain a measured temperature corresponding to the thermoforming area; When the measured temperature reaches the preset temperature, the hot forming area is cooled to obtain an automobile door knocker containing a martensite structure.

4. The method for preparing a car door knocker according to claim 2, characterized in that: After obtaining the automobile door knocker containing martensite structure, the method for preparing the automobile door knocker further comprises: When the hot-formed blank is coated steel, cutting the automobile door ring containing martensite structure; When the hot-formed blank is non-coated steel, the automobile door ring containing martensite structure is cut and shot blasted.

5. The method for preparing a car door knocker according to claim 1, characterized in that: Before the A-pillar upper side beam reinforcement plate, the A-pillar reinforcement plate, the door sill reinforcement plate, the B-pillar reinforcement plate and the side panel upper reinforcement plate are sequentially welded to form an annular slab, the method for preparing the automobile door ring further comprises: Conduct simulation analysis on automobile door knockers to determine the material selection data corresponding to the blanks; Performing forming simulation analysis on the material selection data corresponding to the blank to determine the shape data and welding data corresponding to the blank; Based on the shape data and welding data corresponding to the blank, the blank is blanked to obtain a target plate, which includes at least one of an A-pillar upper beam reinforcement plate, an A-pillar reinforcement plate, a door sill reinforcement plate, a B-pillar reinforcement plate and a side panel upper reinforcement plate.

6. The method for preparing the automobile door knocker according to claim 5, characterized in that: The simulation analysis of the automobile door knocker to determine the material selection data corresponding to the blank includes: Conduct simulation analysis on the automobile door knocker to determine the first material selection data corresponding to the hot forming blank; The forming simulation analysis is performed on the material selection data corresponding to the blank to determine the shape data and welding data corresponding to the blank, including: Performing a forming simulation analysis on the first material selection data corresponding to the thermoforming blank to determine the first shape data and the first welding data corresponding to the thermoforming blank; The blanking process is performed on the blank based on the shape data and welding data corresponding to the blank to obtain the target plate, including: Based on the first shape data and the first welding data corresponding to the hot forming blank, the hot forming blank is subjected to blanking processing to obtain at least one of the A-pillar upper side beam reinforcement plate and the B-pillar reinforcement plate.

7. The method for preparing a car door knocker according to claim 5, characterized in that: The simulation analysis of the automobile door knocker to determine the material selection data corresponding to the blank includes: Conduct simulation analysis on the automobile door knocker to determine the second material selection data corresponding to the cold-formed blank; The forming simulation analysis is performed on the material selection data corresponding to the blank to determine the shape data and welding data corresponding to the blank, including: Performing a forming simulation analysis on the second material selection data corresponding to the cold-formed blank to determine the second shape data and the second welding data corresponding to the cold-formed blank; According to the shape data and welding data corresponding to the blank, the blank is blanked to obtain the target plate, including: Based on the second shape data and the second welding data corresponding to the cold-formed blank, the cold-formed blank is subjected to blanking processing to obtain at least one of the A-pillar reinforcement plate, the rocker reinforcement plate and the side panel upper reinforcement plate.

8. A car door knocker, characterized in that: The automobile door ring includes an A-pillar upper side beam reinforcement plate and a B-pillar reinforcement plate made of hot-formed blanks, and the A-pillar reinforcement plate, the door sill reinforcement plate and the side panel upper reinforcement plate made of cold-formed blanks; The A-pillar upper beam reinforcement plate, the A-pillar reinforcement plate, the door sill reinforcement plate, the B-pillar reinforcement plate and the side panel upper reinforcement plate are welded in sequence to form a ring structure.

9. The automobile door knocker according to claim 8, characterized in that: The A-pillar upper side beam reinforcement plate and the B-pillar reinforcement plate include a martensitic structure formed by quenching.

10. The automobile door knocker according to claim 8, characterized in that: The automobile door ring is provided with an electrophoresis hole.

11. The automobile door knocker according to claim 8, characterized in that: The thickness of the A-pillar upper beam reinforcement plate, the A-pillar reinforcement plate, the door sill reinforcement plate, the B-pillar reinforcement plate and the side panel upper reinforcement plate is 1.2-2.4 mm.

12. A car, characterized in that: The invention comprises the automobile door knocker as described in any one of claims 8 to 11.

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