Automobile composite door ring

Abstract

The utility model belongs to the technical field of automobile parts, and relates to an automobile composite door ring which comprises an A column material piece, a B column material piece, a B column lower section material piece, a threshold material piece and an H column material piece which are annularly connected together in sequence, and the H column material piece, the threshold material piece and the B column lower section material piece are in butt joint in sequence in a tailored blank laser welding mode. One end of the A column material piece is connected with the H column material piece in a lap joint spot welding mode, the other end of the A column material piece is connected with one end of the B column material piece in a lap joint spot welding mode, and the other end of the B column material piece is connected with the B column lower section material piece in a lap joint spot welding mode. Compared with a door ring formed by laser splicing, the automobile composite door ring has the advantages that the manufacturing cost can be saved, the weight of a product can be obviously reduced compared with a door ring in a full spot welding lap joint mode, and the welding technical difficulty of the last welding seam does not exist due to the fact that the spot welding lap joint connection mode is adopted for the last welding seam.

Description

Technical Field

[0001] The utility model relates to an automobile composite door knocker and belongs to the technical field of automobile parts. Background Art

[0002] In recent years, with the rapid development of the automobile industry, the requirements for automobile safety performance and lightweight have become increasingly stringent. In this context, the application of hot-formed high-strength steel plates in automobile manufacturing has gradually become more widespread. This material, with its excellent strength and toughness, provides a strong guarantee for the safety performance of automobiles, and also provides an effective solution for achieving the goal of lightweighting automobiles.

[0003] The spot welding connection method of loose parts is a traditional welding technology widely used in automobile manufacturing. It involves connecting multiple independent metal parts or components (called "loose parts") together by spot welding to form a complete structure. However, with the continuous advancement of automobile manufacturing technology, the requirements for body structure are also constantly increasing. The traditional spot welding connection method of loose parts no longer meets the requirements of safety performance or lightweight, and automobile body parts are gradually developing from the spot welding connection method of loose parts to the integrated direction. For example, taking the side of the automobile body in white as an example, it was mainly connected into one by spot welding by parts such as A-pillar, B-pillar, H-pillar, door sill, and lower section of B-pillar. The current technology is to connect the pre-molding sheets of the above parts into annular sheets by welding, and form a door ring part by one hot pressing, and it has been applied to more and more models.

[0004] The manufacturing of integrated door ring parts is currently mainly achieved through two welding connection technologies:

[0005] One is to weld multiple sheets together by laser so that their edges are adjacent to form a seam (such as Figure 3 As shown), a laser beam is then used to perform laser self-melting welding or wire welding along the seam, thereby finally forming an annular piece. The advantage of this method is that the product is light in weight and has a high material utilization rate, which can significantly reduce the overall weight of the car, thereby improving fuel economy. However, laser welding technology is relatively complex, with high manufacturing costs and large equipment investment. In addition, when the laser welding process welds annular pieces, the dimensional accuracy error of the piece itself, the welding gap error, and the positioning error may cause the width of the last seam to fluctuate, making it difficult to accurately splice according to the designed size, ultimately resulting in unstable quality of the last weld and a high scrap rate. Therefore, the laser welding method has very strict requirements on the quality of the piece edge line, flatness, welding gap, gap fluctuation, etc., which further increases the welding cost.

[0006] Another type of spot welding overlap is to overlap the edges of adjacent sheets (such as Figure 4As shown in the figure, these sheets are then connected into a complete annular sheet by spot welding. The welding cost of this method is relatively low, and there is no problem of unstable quality of the last weld. However, since a certain overlap space needs to be left between the sheets, the weight of the parts is relatively heavy and the material utilization rate is also low. In addition, this method has high requirements on the precision of the hot pressing mold, and the debugging difficulty of the mold is relatively large. Utility Model Content

[0007] The purpose of the utility model is to provide a new technical solution to improve or solve the technical problems existing in the prior art as described above.

[0008] The technical solution provided by the utility model is as follows: a composite door ring for an automobile, comprising an A-pillar sheet, a B-pillar sheet, a B-pillar lower section sheet, a door sill sheet and an H-pillar sheet which are connected in sequence in a ring shape, wherein the H-pillar sheet, the door sill sheet and the B-pillar lower section sheet are connected together in sequence by laser welding, one end of the A-pillar sheet is connected to the H-pillar sheet by overlapping spot welding, the other end of the A-pillar sheet is connected to one end of the B-pillar sheet by overlapping spot welding, and the other end of the B-pillar sheet is connected to the B-pillar lower section sheet by overlapping spot welding.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, it also includes an A-pillar patch plate and a B-pillar patch plate, and the A-pillar patch plate and the B-pillar patch plate are respectively welded to the A-pillar material sheet and the B-pillar material sheet by spot welding.

[0011] The beneficial effect of adopting the above further solution is that the overall structural stability of the door knocker is enhanced, the distribution of materials is optimized, and the door knocker is made more sturdy and durable.

[0012] Furthermore, the overlap widths between the A-pillar sheet, the B-pillar sheet, the B-pillar lower section sheet and the H-pillar sheet are 18 mm to 50 mm.

[0013] The beneficial effect of adopting the above further solution is that it not only ensures the overall strength of the door knocker, but also avoids material waste caused by excessive overlap.

[0014] Furthermore, the gap between the H-pillar sheet, the door sill sheet and the lower section of the B-pillar sheet is 0-0.3 mm.

[0015] The beneficial effect of adopting the above further solution is that the tight joint gap enhances the overall structural strength of the door knocker and improves its ability to resist impact and deformation.

[0016] Furthermore, when the gap between the H-pillar sheet, the door sill sheet and the lower section of the B-pillar sheet is less than 0.2 mm, the H-pillar sheet, the door sill sheet and the lower section of the B-pillar sheet are connected by laser self-melting welding; when the gap between the H-pillar sheet, the door sill sheet and the lower section of the B-pillar sheet is 0.2 mm-0.3 mm, the H-pillar sheet, the door sill sheet and the lower section of the B-pillar sheet are connected by laser wire welding.

[0017] The beneficial effect of adopting the above further scheme is that by selecting the appropriate welding method according to the size of the joint gap, we can not only ensure the manufacturing accuracy and quality of the automotive composite door ring, but also flexibly adjust the welding process according to specific circumstances to improve production efficiency.

[0018] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects: compared with the door ring formed entirely by laser splicing, the automobile composite door ring of the utility model can save manufacturing costs, and compared with the door ring with full spot welding overlap, it can significantly reduce the weight of the product, and the last weld adopts the spot welding overlap connection method, so there is no technical difficulty in welding the last weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 This is a schematic structural diagram of the automobile composite door knocker of the utility model;

[0021] Figure 2 It is a structural schematic diagram of welding the A-pillar patch plate and the B-pillar patch plate on the composite door ring of the automobile of the utility model;

[0022] Figure 3 It is a schematic structural diagram of the H-pillar sheet, the door sill sheet and the B-pillar lower sheet of the utility model, wherein the adjacent edges are joined together;

[0023] Figure 4 It is a schematic diagram of the structure in which the edges of adjacent sheets of the utility model are overlapped together;

[0024] In the figure, 1, A-pillar sheet; 2, B-pillar sheet; 3, B-pillar lower section sheet; 4, door sill sheet; 5, H-pillar sheet; 6, A-pillar patch plate; 7, B-pillar patch plate; D, joint gap; d, overlap width. DETAILED DESCRIPTION

[0025] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0026] like Figure 1 As shown, a composite door ring for an automobile comprises an A-pillar sheet 1, a B-pillar sheet 2, a B-pillar lower section sheet 3, a door sill sheet 4 and an H-pillar sheet 5 which are connected in sequence in a ring shape, wherein the H-pillar sheet 5, the door sill sheet 4 and the B-pillar lower section sheet 3 are connected together in sequence by laser welding, one end of the A-pillar sheet 1 is connected to the H-pillar sheet 5 by overlapping spot welding, the other end of the A-pillar sheet 1 is connected to one end of the B-pillar sheet 2 by overlapping spot welding, and the other end of the B-pillar sheet 2 is connected to the B-pillar lower section sheet 3 by overlapping spot welding.

[0027] like Figure 2 As shown, the automobile composite door ring also includes an A-pillar patch plate 6 and a B-pillar patch plate 7, and the A-pillar patch plate 6 and the B-pillar patch plate 7 are respectively welded to the A-pillar sheet 1 and the B-pillar sheet 2 by spot welding.

[0028] The overlapping width d between the A-pillar sheet 1 and the B-pillar sheet 2, the overlapping width d between the B-pillar sheet 2 and the B-pillar lower section sheet 3, and the overlapping width d between the A-pillar sheet 1 and the H-pillar sheet 5 are all in the range of 18mm-50mm.

[0029] The gap D between the H-pillar sheet 5 , the door sill sheet 4 and the B-pillar lower section sheet 3 is 0-0.3 mm.

[0030] When the gap D between the H-pillar sheet 5, the door sill sheet 4 and the B-pillar lower section sheet 3 is less than 0.2 mm, the H-pillar sheet 5, the door sill sheet 4 and the B-pillar lower section sheet 3 are connected by laser self-melting welding; when the gap D between the H-pillar sheet 5, the door sill sheet 4 and the B-pillar lower section sheet 3 is 0.2 mm-0.3 mm, the H-pillar sheet 5, the door sill sheet 4 and the B-pillar lower section sheet 3 are connected by laser wire filling welding.

[0031] The production method of the automobile composite door knocker of the utility model is as follows:

[0032] S1, the adjacent edges of the H-pillar sheet 5, the door sill sheet 4 and the B-pillar lower section sheet 3 are joined together and welded into a semi-closed sheet by laser welding;

[0033] S2, placing the semi-enclosed sheet, A-pillar sheet 1 and B-pillar sheet 2 on a spot welding fixture respectively, overlapping the edges of adjacent sheets together, and welding them into an annular sheet by spot welding;

[0034] S3, placing the A-pillar patch plate 6 and the B-pillar patch plate 7 on the annular sheet, and welding the A-pillar patch plate 6 and the B-pillar patch plate 7 to the annular sheet by spot welding to form an integrated door ring sheet;

[0035] S4, placing the integrated door ring sheet in a heating furnace for heating, using isothermal or gradient heating, the heating temperature range is 800° C.-970° C., and the heating time is 200s-450s;

[0036] S5, taking the integrated door ring sheet out of the heating furnace and placing it into a hot forming mold for stamping, and quenching it at a cooling rate of greater than or equal to 25° C. / , to obtain a hot stamping door ring;

[0037] S6, laser cutting: taking the hot stamping door ring out of the hot forming mold and removing the excess edge material by laser cutting.

[0038] After actual testing and statistical analysis, the average weight of the door knocker manufactured by the spot welding overlap method is about 19Kg, of which the total weight of the overlapped part is about 0.5Kg. This manufacturing method has a relatively large weight due to the presence of additional materials in the connecting part. In the pursuit of lightweight, energy saving and emission reduction, this data reflects the limitations of the spot welding overlap method in weight control. The cost of the door knocker manufactured by the laser welding method is mainly concentrated on high-precision laser equipment and fine processing technology. The average cost of the door knocker product manufactured by the laser welding method is about 300 yuan. The composite door knocker manufactured by the production process of the present invention has an average weight reduction of 18.7Kg for the annular sheet. Compared with the spot welding overlap method, the weight reduction effect is obvious, which is conducive to reducing overall energy consumption and improving utilization efficiency. The average cost is controlled within 285 yuan, which is not only lower than the laser welding method, but also ensures the quality and performance of the product. Moreover, a door knocker production line saves the company about 400,000 yuan in laser welding fixture costs, which has high market competitiveness.

[0039] Compared with door knockers formed entirely by laser splicing, the automobile composite door knocker of the utility model can save manufacturing costs, and compared with door knockers formed entirely by spot welding overlap, it can significantly reduce the weight of the product. Moreover, the last weld adopts the spot welding overlap connection method, so there is no technical difficulty in welding the last weld.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A composite door knocker for an automobile, comprising an A-pillar sheet (1), a B-pillar sheet (2), a B-pillar lower sheet (3), a door sill sheet (4) and an H-pillar sheet (5) connected in sequence in a ring shape, characterized in that: The H-pillar sheet (5), the door sill sheet (4) and the B-pillar lower section sheet (3) are sequentially butt-jointed together by laser welding, one end of the A-pillar sheet (1) is connected to the H-pillar sheet (5) by overlapping spot welding, the other end of the A-pillar sheet (1) is connected to one end of the B-pillar sheet (2) by overlapping spot welding, and the other end of the B-pillar sheet (2) is connected to the B-pillar lower section sheet (3) by overlapping spot welding.

2. The automobile composite door knocker according to claim 1, characterized in that: It also includes an A-pillar patch plate (6) and a B-pillar patch plate (7), wherein the A-pillar patch plate (6) and the B-pillar patch plate (7) are respectively welded to the A-pillar sheet (1) and the B-pillar sheet (2) by spot welding.

3. The automobile composite door knocker according to claim 1, characterized in that: The overlap width (d) between the A-pillar sheet (1), the B-pillar sheet (2), the B-pillar lower section sheet (3) and the H-pillar sheet (5) is 18 mm to 50 mm.

4. The automobile composite door knocker according to any one of claims 1 to 3, characterized in that: The gap (D) between the H-pillar sheet (5), the door sill sheet (4) and the B-pillar lower section sheet (3) is 0-0.3 mm.

5. The automobile composite door knocker according to claim 4, characterized in that: When the gap (D) between the H-pillar sheet (5), the door sill sheet (4) and the B-pillar lower section sheet (3) is less than 0.2 mm, the H-pillar sheet (5), the door sill sheet (4) and the B-pillar lower section sheet (3) are connected by laser self-melting welding; when the gap (D) between the H-pillar sheet (5), the door sill sheet (4) and the B-pillar lower section sheet (3) is 0.2 mm-0.3 mm, the H-pillar sheet (5), the door sill sheet (4) and the B-pillar lower section sheet (3) are connected by laser wire filling welding.

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