Door ring and vehicle

Abstract

The invention provides a door ring and a vehicle, and relates to the technical field of automobile parts. The door ring comprises a door ring body, the door ring body is formed by splicing, welding and thermally forming a plurality of structural parts, and the thermally formed door ring body comprises an A column reinforcing plate upper section, an A column reinforcing plate lower section, a doorsill structural section, a B column reinforcing plate lower section and a B column reinforcing plate upper section which correspond to the structural parts respectively and are connected end to end; the tensile strength of the door ring body at least on the upper section of the A column reinforcing plate and the lower section of the B column reinforcing plate is larger than or equal to 1800 Mpa. The structure performance requirement and the light weight requirement of the door ring can be considered, and the safety performance of the vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile parts, in particular to a door knocker and a vehicle. Background Art

[0002] At present, a door knocker generally includes a door knocker body and a patch plate. The door knocker body constitutes the basic frame of the door knocker. The patch plate is connected to some positions of the door knocker body. The door knocker body is strengthened by the patch plate to meet the structural performance requirements of the door knocker at various positions.

[0003] However, with the development of vehicle technology, the safety standards of vehicle side collisions are constantly improving, and the structural performance of vehicle door rings needs to be further improved. Summary of the invention

[0004] The present invention aims to solve the problem of how to improve the structural performance of a door ring of a vehicle in the related art to a certain extent.

[0005] In order to solve at least one aspect of the above-mentioned problems to at least a certain extent, in a first aspect, the present invention provides a door knocker, comprising a door knocker body, wherein the door knocker body is formed by hot forming after welding of a plurality of structural parts, and the door knocker body after hot forming comprises an upper section of an A-pillar reinforcement plate, a lower section of an A-pillar reinforcement plate, a door sill structure section, a lower section of a B-pillar reinforcement plate and an upper section of a B-pillar reinforcement plate, which respectively correspond to the plurality of structural parts and are connected end to end; wherein the tensile strength of the door knocker body at least at the upper section of the A-pillar reinforcement plate and the lower section of the B-pillar reinforcement plate is greater than or equal to 1800Mpa.

[0006] Optionally, the door knocker body has a tensile strength weakened area; the threshold structure section includes a first extension section and a second extension section; the first extension section is extended in the horizontal direction and forms at least a part of the threshold; the second extension section is extended in the vertical direction and connected to the lower section of the B-pillar reinforcement plate;

[0007] The tensile strength of the material used for the structural member corresponding to the threshold structural section among the plurality of structural members is configured to be the smallest, so that the door ring body after thermoforming forms the tensile strength weakened region in the threshold structural section.

[0008] Optionally, in the hot forming process of the door ring body, the dew point of the heating device is controlled so that the dew point of the protective gas in the heating device is lower than or equal to -10°C.

[0009] Optionally, the heating device has a water vapor removal unit, which is arranged on the supply path of the protective gas. In the hot forming process of the door ring body, the dew point of the heating device is controlled by the water vapor removal unit.

[0010] Optionally, the door knocker further comprises at least one reinforcement member;

[0011] Wherein, at least one of the reinforcement members is connected to the door ring body after being thermoformed after being formed;

[0012] And / or, wherein at least one of the reinforcement members is connected to the door ring body before thermoforming in the form of a lower sheet.

[0013] Optionally, at least one of the reinforcements comprises a composite reinforcement, the formed composite reinforcement is connected to the thermoformed door ring body, and the door ring body is provided with the composite reinforcement corresponding to at least a bent portion of the upper portion of the A-pillar reinforcement plate close to the upper end;

[0014] And / or, at least one of the reinforcement members comprises an A-pillar reinforcement plate support plate, the A-pillar reinforcement plate support plate is arranged corresponding to the upper portion of the A-pillar reinforcement plate and connected to the upper portion of the A-pillar reinforcement plate;

[0015] When at least one of the reinforcements includes the composite reinforcement and the A-pillar reinforcement plate support plate, the composite reinforcement, the A-pillar reinforcement plate support plate and the upper portion of the A-pillar reinforcement plate are sequentially distributed and connected.

[0016] Optionally, the composite material reinforcement comprises a frame, a connecting piece and a foam glue; the frame is provided with a plurality of the connecting pieces correspondingly, the connecting pieces are partially embedded in the frame and partially exposed to form a connecting portion, the foam glue is provided on the circumferential surface of the frame, and the composite material reinforcement is connected to the door knocker body through the connecting portion and the foam glue;

[0017] And / or, the door knocker body is formed with a receiving cavity for receiving the composite material reinforcement, and a positioning protrusion is provided on a surface of the composite material reinforcement opposite to the inner wall of the receiving cavity.

[0018] Optionally, at least one reinforcement member includes a B-pillar reinforcement plate support plate, and the formed B-pillar reinforcement plate support plate is connected to the hot-formed door ring body at the B-pillar position, and the B-pillar reinforcement plate support plate is made of a continuously variable cross-section rolled plate.

[0019] In the door knocker of the first aspect of the present invention, the door knocker body after thermoforming includes an A-pillar reinforcement plate upper section, an A-pillar reinforcement plate lower section, a door sill structure section, a B-pillar reinforcement plate lower section and a B-pillar reinforcement plate upper section connected end to end; wherein, the door knocker body has a tensile strength of at least 1800Mpa at the A-pillar reinforcement plate upper section and the B-pillar reinforcement plate lower section, which can ensure the structural performance of the A-pillar reinforcement plate upper section and the B-pillar reinforcement plate lower section and meet the corresponding collision safety requirements; and, the door knocker body is formed by thermoforming after welding a plurality of structural parts corresponding to the A-pillar reinforcement plate upper section, the A-pillar reinforcement plate lower section, the door sill structure section, the B-pillar reinforcement plate lower section and the B-pillar reinforcement plate upper section, respectively, and the materials and thicknesses of the plurality of structural parts can be selected according to actual needs, thereby meeting the differentiated requirements of the door knocker body for the structural performance at different positions, and the number of structural parts is small, the number of welds is small, and the welding efficiency can be ensured; in addition, the tensile strength of the door knocker body at the A-pillar reinforcement plate upper section and the B-pillar reinforcement plate lower section is relatively high, which is conducive to reducing the material thickness requirement. In general, the present invention can take into account both the structural performance requirements and the lightweight requirements of the door knocker, thereby improving the safety performance of the vehicle.

[0020] In a second aspect, the present invention provides a door knocker, comprising a door knocker body, wherein the door knocker body is integrally thermoformed from a material of a single grade and / or thickness; the tensile strength of the door knocker body after thermoforming is greater than or equal to 1800 MPa at least in the upper section of the A-pillar reinforcement plate and the lower section of the B-pillar reinforcement plate.

[0021] Optionally, the door knocker body adopts a hot forming soft zone process so that the door knocker body is formed with a tensile strength weakened area, and the door knocker body includes a first extension section and a second extension section; the first extension section is extended in a horizontal direction and forms at least a part of the door sill; the second extension section is extended in a vertical direction and forms at least a part of the B-pillar; the tensile strength weakened area at least covers a part of the first extension section connected to the second extension section and an end of the second extension section connected to the first extension section.

[0022] Optionally, in the hot forming process of the door ring body, the dew point of the heating device is controlled so that the dew point of the protective gas in the heating device is lower than or equal to -10°C.

[0023] Optionally, the heating device has a water vapor removal unit, which is arranged on the supply path of the protective gas. In the hot forming process of the door ring body, the dew point of the heating device is controlled by the water vapor removal unit.

[0024] Optionally, the door knocker further comprises at least one reinforcement member;

[0025] Wherein, at least one of the reinforcement members is connected to the door ring body after being thermoformed after being formed;

[0026] And / or, wherein at least one of the reinforcement members is connected to the door ring body before thermoforming in the form of a lower sheet.

[0027] Optionally, at least one of the reinforcements comprises a composite reinforcement, the formed composite reinforcement is connected to the thermoformed door ring body, and the door ring body is provided with the composite reinforcement corresponding to at least a bent portion of the upper portion of the A-pillar reinforcement plate close to the upper end;

[0028] And / or, at least one of the reinforcement members comprises an A-pillar reinforcement plate support plate, the A-pillar reinforcement plate support plate is arranged corresponding to the upper portion of the A-pillar reinforcement plate and connected to the upper portion of the A-pillar reinforcement plate;

[0029] When at least one of the reinforcements includes the composite reinforcement and the A-pillar reinforcement plate support plate, the composite reinforcement, the A-pillar reinforcement plate support plate and the upper portion of the A-pillar reinforcement plate are sequentially distributed and connected.

[0030] Optionally, the composite material reinforcement comprises a frame, a connecting piece and a foam glue; the frame is provided with a plurality of the connecting pieces correspondingly, the connecting pieces are partially embedded in the frame and partially exposed to form a connecting portion, the foam glue is provided on the circumferential surface of the frame, and the composite material reinforcement is connected to the door knocker body through the connecting portion and the foam glue;

[0031] And / or, the door knocker body is formed with a receiving cavity for receiving the composite material reinforcement, and a positioning protrusion is provided on a surface of the composite material reinforcement opposite to the inner wall of the receiving cavity.

[0032] Optionally, at least one reinforcement member includes a B-pillar reinforcement plate support plate, and the formed B-pillar reinforcement plate support plate is connected to the hot-formed door ring body at the B-pillar position, and the B-pillar reinforcement plate support plate is made of a continuously variable cross-section rolled plate.

[0033] In the door knocker of the second aspect of the present invention, the tensile strength of the door knocker body after thermoforming is greater than or equal to 1800Mpa at least in the upper section of the A-pillar reinforcement plate and the lower section of the B-pillar reinforcement plate, which can ensure the structural performance of the upper section of the A-pillar reinforcement plate and the lower section of the B-pillar reinforcement plate, and meet the corresponding collision safety requirements. On this basis, the thickness requirement of the material can be reduced, which is conducive to lightweight design; and the door knocker body is thermoformed as a whole from a material of a single grade and / or thickness. When manufacturing the door knocker body, the number of structural parts used in the door knocker body can be reduced as much as possible, and the weld requirements can be reduced, which is conducive to ensuring the overall structural performance of the door knocker body after thermoforming. In general, the present invention can take into account the structural performance requirements and lightweight requirements of the door knocker and improve the safety performance of the vehicle.

[0034] In a third aspect, the present invention provides a vehicle, comprising the door knocker as described in the first aspect or the second aspect. The vehicle has all the beneficial effects possessed by the door knocker, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the door ring body after multiple structural parts are welded and thermoformed in an embodiment of the present invention;

[0036] Figure 2 for Figure 1 The door ring body shown is connected with an A-pillar reinforcement plate support plate, a composite reinforcement member, a pillar reinforcement support plate, an A-pillar upper hinge reinforcement plate and an A-pillar lower hinge reinforcement plate;

[0037] Figure 3 It is a schematic structural diagram of a door knocker body after the door knocker body is hot-pressed from a material of a single grade and thickness in an embodiment of the present invention;

[0038] Figure 4 for Figure 3 The door ring body shown is connected with an A-pillar reinforcement plate support plate, a composite reinforcement member, a pillar reinforcement support plate, an A-pillar upper hinge reinforcement plate and an A-pillar lower hinge reinforcement plate;

[0039] Figure 5 It is a schematic diagram of a three-dimensional cross-sectional structure of a composite material reinforcement member in an embodiment of the present invention;

[0040] Figure 6 For Figure 2 The corresponding schematic diagram of the structure of the door knocker of the present invention;

[0041] Figure 7 for Figure 6 Schematic diagram of the three-dimensional structure at the AA section;

[0042] Figure 8 for Figure 6 Schematic diagram of the three-dimensional structure at the middle BB section;

[0043] Fig. 9 for Figure 6 Schematic diagram of the three-dimensional structure at the CC section;

[0044] Fig.10 It is a distribution diagram of the thinning rate control of the door ring body in an embodiment of the present invention.

[0045] Description of reference numerals:

[0046] 1-door knocker body; 11-upper section of A-pillar reinforcement plate; 111-third extension section; 112-fourth extension section; 113-fifth extension section; 12-lower section of A-pillar reinforcement plate; 121-sixth extension section; 122-seventh extension section; 13-sill structure section; 131-first extension section; 132-second extension section; 14-lower section of B-pillar reinforcement plate; 15-upper section of B-pillar reinforcement plate; 151-eighth extension section; 152-ninth extension section; 2-composite reinforcement member; 21-skeleton; 22-connecting piece; 221-connecting part; 23-foaming glue; 24-positioning hole; 25-positioning protrusion; 3-A-pillar reinforcement plate support plate; 31-first plate section; 32-second plate section; 33-third plate section; 4-B-pillar reinforcement plate support plate; 5-A-pillar upper hinge reinforcement plate; 6-A-pillar lower hinge reinforcement plate; SA-tensile strength weakened area. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0048] 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment", "some embodiments", "exemplarily" and "one embodiment" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or embodiment are included in at least one embodiment or embodiment of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or embodiment. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or embodiments in a suitable manner.

[0050] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0051] The Z axis in the accompanying drawings represents the vertical direction, that is, the up and down position, and the positive direction of the Z axis (that is, the direction of the arrow of the Z axis) represents the up, and the negative direction of the Z axis represents the down; the Y axis in the accompanying drawings represents the front and back position, and the positive direction of the Y axis (that is, the direction of the arrow of the Y axis) represents the front side, and the negative direction of the Y axis represents the back side; it should be noted that the aforementioned Z axis and Y axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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.

[0052] At present, a door knocker generally includes a door knocker body and a patch plate. The door knocker body constitutes the basic frame of the door knocker. The patch plate is connected to some positions of the door knocker body. The door knocker body is strengthened by the patch plate to meet the structural performance requirements of the door knocker at various positions.

[0053] However, with the development of vehicle technology, the safety standards of vehicle side collisions are constantly improving, and the structural performance of vehicle door rings is insufficient. For example, the tensile strength of the current door rings at collision locations such as the A-pillar is usually lower than 1300Mpa, and more patch plates and thicker materials are needed to make the door rings, which is not conducive to the lightweight of the vehicle.

[0054] like Figure 1 As shown, in the first aspect, an embodiment of the present invention provides a door knocker, comprising a door knocker body 1, which is formed by hot forming after welding of multiple structural parts, and the hot formed door knocker body 1 comprises an A-pillar reinforcement plate upper section 11, an A-pillar reinforcement plate lower section 12, a door sill structure section 13, a B-pillar reinforcement plate lower section 14 and a B-pillar reinforcement plate upper section 15, which respectively correspond to the multiple structural parts and are connected end to end; wherein, the tensile strength of the door knocker body 1 at least in the A-pillar reinforcement plate upper section 11 and the B-pillar reinforcement plate lower section 14 is greater than or equal to the first preset tensile strength.

[0055] The first preset tensile strength is greater than or equal to 1800 MPa. For example, the first preset tensile strength is 1800 MPa or 2000 MPa. In this specification, the first preset tensile strength is 1800 MPa as an example to illustrate the content of the present invention.

[0056] It should be understood that, unless otherwise specified, or when it cannot be inferred from the context, the description of tensile strength in this specification refers to the door knocker after thermoforming and will not be described separately later.

[0057] In this embodiment, specifically, the door knocker body 1 is formed by welding a plurality of structural parts and then hot forming. The door knocker body 1 after hot forming includes an A-pillar reinforcement plate upper section 11, an A-pillar reinforcement plate lower section 12, a door sill structure section 13, a B-pillar reinforcement plate lower section 14, and a B-pillar reinforcement plate upper section 15 connected end to end. The door knocker body 1 before hot forming has corresponding structural parts corresponding to the A-pillar reinforcement plate upper section 11, the A-pillar reinforcement plate lower section 12, the door sill structure section 13, the B-pillar reinforcement plate lower section 14, and the B-pillar reinforcement plate upper section 15. For example, the plurality of structural parts include: a structural part corresponding to the A-pillar reinforcement plate upper section 11, a structural part corresponding to the A-pillar reinforcement plate lower section 12, a structural part corresponding to the door sill structure section 13, a structural part corresponding to the B-pillar reinforcement plate lower section 14, and a structural part corresponding to the B-pillar reinforcement plate upper section 15.

[0058] In some scenarios, the five structural parts are welded together as a whole and then thermoformed to obtain the door knocker body 1. On the basis of meeting the relevant requirements of welding, the five structural parts can select materials and appropriate thicknesses as needed to meet the corresponding use requirements.

[0059] Of course, in some scenarios, after the above five structural parts are welded together into a whole, other structural parts such as some reinforcement plates will be welded and then hot-formed, which is not a limitation.

[0060] Thus, in this embodiment, the door knocker body 1 after hot forming includes an A-pillar reinforcement plate upper section 11, an A-pillar reinforcement plate lower section 12, a door sill structure section 13, a B-pillar reinforcement plate lower section 14 and a B-pillar reinforcement plate upper section 15 connected end to end; wherein, the door knocker body 1 has a tensile strength of at least 1800Mpa at the A-pillar reinforcement plate upper section 11 and the B-pillar reinforcement plate lower section 14, which can ensure the structural performance of the A-pillar reinforcement plate upper section 11 and the B-pillar reinforcement plate lower section 14 and meet the corresponding collision safety requirements; and the door knocker body 1 is composed of the A-pillar reinforcement plate upper section 11, the A-pillar reinforcement plate lower section 12, the door sill structure section 13, the B-pillar reinforcement plate lower section 14 and the B-pillar reinforcement plate upper section 15 connected end to end. The multiple structural parts corresponding to the lower section 12 of the pillar reinforcement plate, the door sill structural section 13, the lower section 14 of the B-pillar reinforcement plate and the upper section 15 of the B-pillar reinforcement plate are formed by welding and then hot forming. The materials and thicknesses of the multiple structural parts can be selected according to actual needs, so as to meet the differentiated requirements of the door ring body 1 for the structural performance at different positions, and the number of structural parts and welds is small, which can ensure the welding efficiency; in addition, the tensile strength of the door ring body 1 at the upper section 11 of the A-pillar reinforcement plate and the lower section 14 of the B-pillar reinforcement plate is relatively high, which is conducive to reducing the thickness requirements of the material. In general, the present invention can take into account the structural performance requirements and lightweight requirements of the door ring and improve the safety performance of the vehicle.

[0061] like Figure 1As shown, optionally, the door knocker body 1 has a tensile strength weakened area SA; the door knocker body 1 includes a first extension segment 131 and a second extension segment 132; the first extension segment 131 is extended in the horizontal direction and forms at least a part of the door sill; the second extension segment 132 is extended in the vertical direction and forms at least a part of the B-pillar; the tensile strength weakened area SA at least covers the part of the first extension segment 131 connected to the second extension segment 132 and one end of the second extension segment 132 connected to the first extension segment 131.

[0062] It should be understood in the art that, relative to the extension along the Z-axis direction, the first extension section 131 extends in the horizontal direction, which does not mean that the extension direction of the first extension section 131 must be a straight line, nor does it mean that the extension direction of the first extension section 131 must be parallel to the horizontal direction, and the first extension section 131 can have a small angle with the horizontal direction. The subsequent extension of the second extension section 132 and the like is similar to this, and will not be described separately one by one in the following.

[0063] It should be understood that the tensile strength of the door ring body 1 after thermoforming is relatively weak in the tensile strength weakened area SA, so that when a vehicle collides, the door ring body 1 can deform to a certain extent in the tensile strength weakened area SA to absorb and disperse the collision energy and protect the safety of passengers. In particular, in a severe side collision, the tensile strength weakened area SA has appropriate flexibility, which can provide a larger survival space for passengers and reduce the squeeze damage to passengers.

[0064] like Figure 1 As shown, further, the threshold structure segment 13 includes the above-mentioned first extension segment 131 and the second extension segment 132, and the tensile strength of the material used for the structural parts corresponding to the threshold structure segment 13 among the multiple structural parts is configured to be the minimum, so that the door ring body 1 after thermoforming forms a tensile strength weakened area SA in the threshold structure segment 13.

[0065] Specifically, when selecting the above five structural parts, the tensile strength of the material of the structural part corresponding to the threshold structural section 13 is configured to be the minimum, so that the door ring body 1 after thermoforming forms a tensile strength weakened area SA in the threshold structural section 13 .

[0066] Thus, when selecting the above five structural parts, on the basis of meeting the structural performance requirements, the door sill structural section 13 can be made of a material with relatively low tensile strength, or a thinner material, which is beneficial to the lightweight design of the vehicle and reduces material costs.

[0067] like Figure 1As shown, optionally, the A-pillar reinforcement plate upper section 11 includes a third extension section 111, a fourth extension section 112 and a fifth extension section 113 which are arranged in sequence, the third extension section 111 extends in the vertical direction and is connected to the A-pillar reinforcement plate lower section 12, the fifth extension section 113 extends in the horizontal direction and is connected to the B-pillar reinforcement plate upper section 15, the fourth extension section 112 constitutes the main part of the A-pillar reinforcement plate upper section 11, the fourth extension section 112 is inclined relative to the horizontal plane, the two ends of the fourth extension section 112 are respectively connected to the third extension section 111 and the fifth extension section 113, and a bending structure is formed at the two ends. In this way, it is not necessary to form a weld on the main part of the A-pillar reinforcement plate upper section 11, such as the fourth extension section 112, which is conducive to ensuring the structural performance of the A-pillar reinforcement plate upper section 11 and ensuring its collision safety.

[0068] like Figure 1 As shown, optionally, the lower section 12 of the A-pillar reinforcement plate includes a sixth extension section 121 and a seventh extension section 122, the sixth extension section 121 extends in the horizontal direction and is connected to the first extension section 131 of the rocker structure section 13, and the seventh extension section 122 extends in the vertical direction and is connected to the third extension section 111 of the upper section 11 of the A-pillar reinforcement plate. Exemplarily, the length of the sixth extension section 121 is less than the length of the first extension section 131, for example, the length of the portion of the first extension section 131 located in front of the second extension section 132 is N times the length of the sixth extension section 121, N is greater than or equal to 2, for example, N = 2, 5, N = 3. The length of the seventh extension section 122 is greater than the length of the first extension section 131, and the ratio of the two lengths is greater than 2.

[0069] like Figure 1 As shown, optionally, the B-pillar reinforcement plate upper section 15 includes an eighth extension section 151 and a ninth extension section 152; the eighth extension section 151 extends in the horizontal direction and is connected to the fifth extension section 113 of the A-pillar reinforcement plate upper section 11, and the ninth extension section 152 extends in the vertical direction and is connected to the B-pillar reinforcement plate lower section 14. Exemplarily, the length of the B-pillar reinforcement plate lower section 14 is greater than the length of the ninth extension section 152, for example, the ratio of the two is greater than 2, for example, the ratio of the two is greater than 3.

[0070] In the above embodiment, optionally, the door knocker further includes at least one reinforcement member; the reinforcement member is connected to the door knocker body 1, and can reinforce the door knocker body 1 to ensure the structural performance of the door knocker.

[0071] Optionally, at least one reinforcement member is connected to the door ring body 1 after thermoforming after forming; and / or, at least one reinforcement member is connected to the door ring body 1 before thermoforming in the form of a lower sheet.

[0072] Specifically, at least one reinforcement is connected to the thermoformed door knocker body 1 after being formed, which means that the reinforcement and the door knocker body 1 are connected by welding or other connection methods after being formed separately, so as to fix the position of the reinforcement on the door knocker body 1.

[0073] At least one reinforcement is connected to the door knocker body 1 before thermoforming in the form of a lower sheet, indicating that the reinforcement and the door knocker body 1 are connected in the form of a lower sheet and then the required door knocker body 1 and reinforcement are obtained through a thermoforming process, which will be exemplified in conjunction with specific embodiments later.

[0074] like Figure 2 , Figures 6 to 9 As shown, in this embodiment, the door ring is optionally provided with a plurality of reinforcement members, including one or more of the composite reinforcement member 2, the A-pillar reinforcement plate support plate 3, the B-pillar reinforcement plate support plate 4, the A-pillar upper hinge reinforcement plate and the A-pillar lower hinge reinforcement plate 6. Figure 2 As shown, it shows a situation in which multiple reinforcements include a composite reinforcement 2, an A-pillar reinforcement plate support plate 3, a B-pillar reinforcement plate support plate 4, an A-pillar upper hinge reinforcement plate 5 and an A-pillar lower hinge reinforcement plate 6, but it should be understood that the arrangement of the reinforcements is not limited to this.

[0075] Optionally, the formed composite reinforcement 2 is connected to the door ring body 1 after thermoforming.

[0076] It should be understood that the location of the composite reinforcement 2 can be determined according to actual needs, and it can be arranged at a location of the door ring body 1 that requires specific reinforcement as needed.

[0077] It should be understood that the composite reinforcement 2 can generally provide better mechanical properties, such as tensile strength, compressive strength and impact resistance, while reducing weight. An exemplary description will be given later.

[0078] like Figure 2 As shown, exemplarily, the door knocker body 1 is provided with a composite reinforcement 2 corresponding to at least the bent portion of the upper section 11 of the A-pillar reinforcement plate close to the upper end.

[0079] It should be understood that the bent portion of the upper section 11 of the A-pillar reinforcement plate near the upper end is a very critical part of the vehicle structure, and it is one of the main load-bearing parts of the vehicle side structure.

[0080] In this way, the bent portion is provided with a composite material reinforcement 2, which can improve the structural performance of the bent portion of the door ring on the A-pillar, improve the safety performance of the vehicle, and especially improve the safety of the vehicle in head-on collision and offset collision.

[0081] like Figure 5As shown, further, the composite material reinforcement 2 includes a skeleton 21, a connecting piece 22 and a foam glue 23; the skeleton 21 is correspondingly provided with a plurality of connecting pieces 22, the connecting pieces 22 are partially embedded in the skeleton 21 and partially exposed to form a connecting portion 221, and the foam glue 23 is arranged on the circumferential surface of the skeleton 21, and the composite material reinforcement 2 is connected to the door knocker body 1 through the connecting portion 221 and the foam glue 23.

[0082] Specifically, the frame 21 can be made of PA66 and glass fiber composite material, the connecting piece 22 is a metal piece, the connecting piece 22 and the frame 21 are formed into one piece by injection molding, and then connected to the door knocker body 1 through the connecting part 221, such as spot welding. Then, electrophoresis and foaming treatment are performed, and after the foaming treatment, the composite material reinforcement 2 is more firmly connected to the door knocker body 1. The frame 21 may include a shell and a mesh structure integrally arranged in the shell, which will not be described in detail here.

[0083] In this embodiment, the door knocker body 1, the thermoplastic composite material carrier (i.e., the skeleton 21) and the expandable adhesive (and the foaming glue 23) are integrated together, which can improve the local stiffness of the door knocker body 1 at the composite material reinforcement 2 without adding too much weight, thereby improving the vehicle's anti-top pressure performance and ensuring its safety.

[0084] Optionally, the door knocker body 1 is formed with a receiving cavity for receiving the composite material reinforcement member 2. In this way, the receiving cavity can be structurally reinforced by the composite material reinforcement member 2 to ensure its structural performance.

[0085] like Figure 7 As shown, optionally, the circumferential surface of the skeleton 21 of the composite reinforcement 2 is provided with positioning protrusions 25 .

[0086] Exemplarily, a positioning protrusion 25 is provided on the surface of the frame 21 opposite to the inner wall of the accommodating cavity.

[0087] In this way, when the composite reinforcement 2 is welded to the door knocker body 1, the positioning protrusion 25 can abut against the door knocker body 1, thereby ensuring that a gap is left between the frame 21 and the door knocker body 1, and the gap is used to reserve corresponding space for electrophoresis and foaming.

[0088] Optionally, a positioning hole 24 is provided on the frame 21 , and when the frame 21 is accommodated in the accommodation cavity, one end of the positioning hole 24 is exposed.

[0089] It should be understood that when the composite material reinforcement 2 is connected to the door knocker body 1, the composite material reinforcement 2 may be displaced. Therefore, the door knocker body 1 and the reset material reinforcement are positioned respectively by a positioning fixture. Specifically, the positioning column on the positioning fixture is positioned and connected with the positioning hole 24 on the frame 21.

[0090] For example, the number of positioning holes 24 is set to be multiple along the extension direction of the frame 21. For example, the number of positioning holes 24 is set to two to improve the positioning reliability and accuracy between the reset material reinforcement and the door ring body 1. It can be set according to actual needs. Electrophoresis holes can also be set on the frame 21.

[0091] It should be understood that when the door ring is used for the side panel of the vehicle, the side panel includes the door ring and may also include a sheet metal outer panel, a sheet metal inner panel, etc., and the portion of the circumferential surface of the composite reinforcement 2 exposed to the accommodating cavity may abut against the sheet metal inner panel through the positioning protrusion 25. No detailed description is given here.

[0092] like Figure 2 As shown, optionally, the A-pillar reinforcement plate support plate 3 is arranged corresponding to the A-pillar reinforcement plate upper section 11 and is connected to the A-pillar reinforcement plate upper section 11 .

[0093] It should be understood that the A-pillar reinforcement plate support plate 3 can be connected to the door ring body 1 after thermoforming after molding, or can be connected to the door ring body 1 before thermoforming in the form of a sheet before molding, and then hot-pressed as a whole. In this case, the A-pillar reinforcement plate support plate 3 is integrally fitted with the upper section 11 of the A-pillar reinforcement plate.

[0094] like Figure 2 As shown, it shows that the A-pillar reinforcement plate support plate 3 includes a first plate segment 31, a second plate segment 32 and a third plate segment 33. The first plate segment 31, the third plate segment 33 and the second plate segment 32 are distributed in sequence. The first plate segment 31 is arranged corresponding to the third extension segment 111 of the upper section 11 of the A-pillar reinforcement plate. In some cases, it can also be arranged corresponding to the sixth extension segment 121 of the lower section 12 of the A-pillar reinforcement plate. The second plate segment 32 is arranged corresponding to the connection area of ​​the eighth extension segment 151 and the ninth extension segment 152 of the upper section 15 of the B-pillar reinforcement plate.

[0095] In this way, the provision of the A-pillar reinforcement plate support plate 3 can effectively strengthen the upper section 11 of the A-pillar reinforcement plate, thereby ensuring the structural performance of the door ring at the upper section 11 of the A-pillar reinforcement plate.

[0096] like Figure 2 As shown, it shows that the door ring has both an A-pillar reinforcement plate support plate 3 and a composite material reinforcement 2. In this case, the A-pillar reinforcement plate support plate 3 can be fitted with the door ring body 1 (of course, the two can also be enclosed in some areas to form a reinforced cavity), and the connecting portion 221 of the composite material reinforcement 2 is fitted with the A-pillar reinforcement plate support plate 3, and the composite material reinforcement 2, the A-pillar reinforcement plate support plate 3 and the door ring body 1 are connected.

[0097] In this case, the A-pillar reinforcement plate support plate 3 and the door ring body 1 can be first welded in the form of a sheet and then thermoformed, which can ensure the reliability of the connection between the two and the fit between the two, with small errors, simple structure and strong practicality.

[0098] Optionally, the B-pillar reinforcement plate support plate 4 is connected to the door ring body 1 at the B-pillar position.

[0099] Similarly, in some cases, the B-pillar reinforcement plate support plate 4 and the door ring body 1 can be connected in the form of a lower sheet and then integrally thermoformed.

[0100] In some cases, the B-pillar reinforcement plate support plate 4 is formed and then connected to the door ring body 1 after thermoforming.

[0101] Exemplarily, the B-pillar reinforcement plate support plate 4 is made of a continuously variable cross-section rolled plate, which is spot-welded to the door ring body 1 .

[0102] Exemplarily, the upper end of the B-pillar reinforcement plate support plate 4 is connected to the A-pillar reinforcement plate support plate 3, which will not be described in detail here.

[0103] In this way, the B-pillar reinforcement plate support plate 4 is made of a continuously variable cross-section rolled plate, and the cross-sectional dimensions of each position of the B-pillar reinforcement plate support plate 4 can be specifically designed according to the structural performance requirements of each area of ​​the B-pillar, taking into account both the structural performance enhancement requirements and the lightweight design requirements of the B-pillar.

[0104] Of course, in other embodiments, the B-pillar reinforcement plate support plate 4 may also be made of a rolled plate with uniform thickness, which will not be described in detail here.

[0105] In the above embodiment, optionally, during the hot forming process of the door knocker body 1, the dew point of the heating device is controlled.

[0106] Exemplarily, the dew point of the heating device is controlled so that the dew point of the protective gas in the heating device is lower than or equal to -10°C.

[0107] Exemplarily, the dew point of the heating device is controlled so that the dew point of the protective gas in the heating device is lower than or equal to -15°C.

[0108] Exemplarily, the dew point of the heating device is controlled so that the dew point of the protective gas in the heating device is lower than or equal to -25°C.

[0109] Exemplarily, the heating device is a roller hearth furnace, which is a continuous heat treatment furnace mainly used for heating and heat treatment processes of metals, such as annealing, normalizing, quenching and tempering. In a roller hearth furnace, the workpiece is supported and driven by rollers and moves along the furnace to achieve uniform heating. In protective atmosphere heat treatment, a specific gas is usually filled inside the roller hearth furnace. Dew point control is usually carried out in the heating section. By adjusting the dew point of the protective gas in the furnace, a suitable heat treatment environment can be maintained to ensure the dryness of the atmosphere in the furnace and prevent water vapor from condensing on the surface of the workpiece, thereby avoiding defects such as oxidation and hydrogen embrittlement.

[0110] It should be understood that during the heat treatment process of steel, as the yield strength and compressive strength of the material increase, the risk of hydrogen embrittlement increases. Steel with a tensile strength below 1500Mpa has a lower risk of hydrogen embrittlement, while the risk of hydrogen embrittlement cracking of 1800Mpa steel is relatively high. Therefore, by controlling the dew point temperature in roller hearth furnace production to reduce the hydrogen content and the risk of hydrogen embrittlement cracking of 1800Mpa steel, its mechanical properties can be guaranteed.

[0111] It should be understood that the door knocker body 1 after thermoforming can also be subjected to a low-temperature tempering process. Through low-temperature tempering, internal stress can be reduced, thereby reducing the risk of deformation and cracking of parts.

[0112] Optionally, the heating device has a water vapor removal unit, and the water vapor removal unit is arranged on the supply path of the protective gas.

[0113] It should be understood that the water vapor removal unit can use one or more technologies selected from the group consisting of a cold dryer, an adsorption dryer, a micro-thermal adsorption dryer, and a membrane separation technology to remove water vapor from the protective gas, thereby reducing the water content in the protective gas.

[0114] In this embodiment, during the hot forming process of the door ring body 1, the water vapor removal unit can be used to control the dew point of the heating device to reduce the water vapor content. For example, the water vapor removal unit can be used to control the dew point of the heating device to make the dew point of the protective gas lower than or equal to -10°C.

[0115] Alternatively, if Fig.10 As shown, during the design stage, the thinning rate of the door knocker body 1 is controlled.

[0116] Specifically, the thinning rate of the stress concentration area is controlled within 11%, and the thinning rate of other areas is controlled within 13%.

[0117] Exemplarily, the thinning rate of the upper section 11 of the A-pillar reinforcement plate of the door knocker body 1 is controlled to be less than or equal to 7.5%, for example, the thinning rate of the upper section 11 of the A-pillar reinforcement plate is controlled to be between 7.3% and 7.5%.

[0118] Exemplarily, the thinning rate of the upper section 15 of the B-pillar reinforcement plate is controlled to be less than or equal to 7.5%, for example, the thinning rate of the upper section 15 of the B-pillar reinforcement plate is controlled to be between 7.3% and 7.5%.

[0119] Exemplarily, the thinning rate of the lower section 14 of the B-pillar reinforcement plate is controlled to be less than or equal to 10%.

[0120] Exemplarily, the thinning rate of the rocker structure segment 13 is controlled to be less than or equal to 13%.

[0121] Exemplarily, the thinning rate of the lower section of the A-pillar reinforcement plate gradually increases from top to bottom.

[0122] In this way, by controlling the thinning rate, the risk of local excessive thinning can be reduced, and the structural performance of the door knocker body 1 can be ensured.

[0123] Alternatively, if Fig.10 As shown, the fillet radius in the formed S1 area is greater than or equal to 5 times the material thickness.

[0124] Specifically, the circumferential profile of the S1 region is relatively smooth. The fillet radius of the forming is set to be greater than or equal to 5 times the material thickness, which can reduce the tensile stress at the bend during the stamping process, and can prevent the material from extending in the thickness direction beyond its elastic limit, thereby reducing the risk of cracks and improving the quality of the hot-formed door ring body 1.

[0125] Alternatively, if Fig.10 As shown, a receiving groove (ie corresponding to the above-mentioned receiving cavity) is formed by stamping during thermoforming of the door knocker body 1, the cross section of the receiving groove is U-shaped, and the side wall draft angle of the U-shaped part is greater than or equal to 3°.

[0126] This facilitates the hot forming of the door knocker body 1 and helps ensure the surface quality and dimensional accuracy of the door knocker body 1, thereby reducing the generation of defective products.

[0127] like Fig.10 As shown, further, a suitable rounded corner connection surface is designed in the S2 area. Specifically, the S area is the rounded corner transition area of ​​the door knocker body 1. It can be understood that the inner side of the ring formed by the door knocker body 1 is formed with a flange, and the flange is usually formed at the opening edge of the above-mentioned receiving groove. Compared with the S1 area, the width of the flange in the S2 area is larger, and the inner end of the flange in the S2 area is rounded, and the rounded corner connection surface is formed by the flange.

[0128] In this embodiment, on the one hand, the fillet of the fillet transition area can be made as large as possible, and on the other hand, the design of a suitable fillet connection surface can better absorb and disperse stress, reduce the tensile stress of the material during forming, and avoid cracks during the forming process.

[0129] In an embodiment of the present invention, exemplarily, the door knocker body 1 after hot pressing has a tensile strength greater than or equal to 1800 MPa at the upper section 11 of the A-pillar reinforcement plate, a tensile strength of 1000-1500 MPa at the lower section 12 of the A-pillar reinforcement plate, a tensile strength of 500-1000 MPa at the threshold structure section 13, a tensile strength greater than or equal to 1800 MPa at the lower section 14 of the B-pillar reinforcement plate, and a tensile strength greater than or equal to 1300 MPa at the upper section 15 of the B-pillar reinforcement plate.

[0130] Exemplarily, the structural member corresponding to the upper section 11 of the A-pillar reinforcement plate is made of CR1200 / 1800HS or CR1200 / 1800HS-AS, and has a thickness greater than 1.2 mm, such as a thickness of 1.2-2.0 mm, such as a thickness of 1.6-2.0 mm.

[0131] The structural member corresponding to the lower section 12 of the A-pillar reinforcement plate is made of CR950 / 1300HS or CR950 / 1300HS-AS, and has a thickness of 1.2-2.0 mm.

[0132] The structural member corresponding to the threshold structural section 13 is made of any one of CR370 / 550HS-AS, CR780 / 980HS-AS, CR370 / 550HS and CR780 / 980HS, and has a thickness of 1.2-1.8 mm.

[0133] The structural member corresponding to the lower section 14 of the B-pillar reinforcement plate is made of CR1200 / 1800HS or CR1200 / 1800HS-AS, and the thickness unit is 1.2-2.0 mm.

[0134] The upper section 15 of the B-pillar reinforcement plate is made of CR950 / 1300HS or CR950 / 1300HS-AS and has a thickness of 1.2-2.0 mm.

[0135] It should be understood that, without special considerations such as weakening considerations, and without considering factors such as cost, the tensile strength of the A-pillar reinforcement plate lower section 12 and the B-pillar reinforcement plate upper section 15 in the above parts can also be set to be greater than or equal to 1800Mpa. Specifically, the A-pillar reinforcement plate lower section 12 and the B-pillar reinforcement plate upper section 15 can also be made of CR1200 / 1800HS or CR1200 / 1800HS-AS.

[0136] It should be understood that without special considerations such as weakening considerations, and without considering factors such as cost, the thickness of some components in the above-mentioned parts can be designed to be thicker. For example, the thickness of the upper section 11 of the A-pillar reinforcement plate can be greater than 2.0 mm, for example, 2.6 mm.

[0137] It should be understood that the coated plates and the uncoated plates in the above parts cannot be mixed (either all coated plates or all uncoated plates), which will not be explained in detail here.

[0138] An embodiment of the present invention also provides a door knocker, comprising a door knocker body 1, which is integrally thermoformed from a material of a single grade and / or thickness; the thermoformed door knocker body 1 has a tensile strength greater than or equal to a first preset tensile strength at least in the upper section 11 of the A-pillar reinforcement plate and the lower section 14 of the B-pillar reinforcement plate.

[0139] The first preset tensile strength is greater than or equal to 1800 MPa. For example, the first preset tensile strength is 1800 MPa or 2000 MPa. In this specification, the first preset tensile strength is 1800 MPa as an example to illustrate the content of the present invention.

[0140] Different from the above-mentioned embodiment, in which the door knocker body 1 is formed by welding a plurality of structural parts and then hot-forming, and the plurality of structural parts can be made of materials of different grades and thicknesses, in this embodiment, the door knocker body 1 can be formed by a material of a single grade and a single thickness. In other words, without considering other factors, the door knocker body 1 of this embodiment can be cut in the form of a whole plate, and then hot-formed to obtain the door knocker body 1. It avoids welding a plurality of structural parts, reduces the number of welds, or even eliminates the need for welds.

[0141] For ease of understanding, in this embodiment, the door knocker body 1 after thermoforming is also defined as including the A-pillar reinforcement plate upper section 11, the A-pillar reinforcement plate lower section 12, the door sill structure section 13, the B-pillar reinforcement plate lower section 14 and the B-pillar reinforcement plate upper section 15 which are connected end to end. However, it should be understood that when the door knocker body 1 is thermoformed from the entire plate, there are no structural parts corresponding to the A-pillar reinforcement plate upper section 11, the A-pillar reinforcement plate lower section 12, the door sill structure section 13, the B-pillar reinforcement plate lower section 14 and the B-pillar reinforcement plate upper section 15, and there are no corresponding welds.

[0142] Thus, in this embodiment, the tensile strength of the door ring body 1 after thermoforming is greater than or equal to 1800Mpa at least in the upper section 11 of the A-pillar reinforcement plate and the lower section 14 of the B-pillar reinforcement plate, which can ensure the structural performance of the upper section 11 of the A-pillar reinforcement plate and the lower section 14 of the B-pillar reinforcement plate, and meet the corresponding collision safety requirements. On this basis, the material thickness requirement can be reduced, which is conducive to lightweight design; and the door ring body 1 is thermoformed as a whole from a material of a single grade and / or thickness. When manufacturing the door ring body 1, the number of structural parts used in the door ring body 1 can be reduced as much as possible, and the weld requirements can be reduced, which is conducive to ensuring the overall structural performance of the door ring body 1 after thermoforming. In general, the present invention can take into account the structural performance requirements and lightweight requirements of the door ring and improve the safety performance of the vehicle.

[0143] Furthermore, the door knocker body 1 adopts a hot forming soft zone process.

[0144] Specifically, in the thermoforming process, "soft zone" usually refers to the adjustment of local material strength achieved through mold design, that is, creating areas with different strength characteristics on the same part. This technology is achieved through the water cooling and electric heating system of the mold, so that one part of the part (soft zone) maintains a lower strength, while another part (hard zone) has a higher strength.

[0145] like Figure 3 As shown, specifically, the door knocker body 1 adopts a hot forming soft zone process so that the door knocker body 1 is formed with a tensile strength weakened area SA, and the door knocker body 1 includes a first extension section 131 and a second extension section 132; the first extension section 131 is extended in a horizontal direction and forms at least a part of the door sill; the second extension section 132 is extended in a vertical direction and forms at least a part of the B-pillar; the tensile strength weakened area SA at least covers a part of the first extension section 131 connected to the second extension section 132 and an end of the second extension section 132 connected to the first extension section 131.

[0146] The tensile strength of the tensile strength weakened area SA can be determined according to actual needs. In this embodiment, for example, the door knocker body 1 adopts the non-coated plate CR1200 / 1800HS with a thickness of 1.2mm-2.0mm and is thermoformed through the soft zone process, or the door knocker body 1 adopts the coated plate CR1200 / 1800HS-AS (coating thickness 75 / 75, 25 / 25) with a thickness of 1.2mm-2.0mm and is thermoformed through the soft zone process.

[0147] The tensile strength of the door ring body 1 after thermoforming at the upper section 11 of the A-pillar reinforcement plate and the lower section 14 of the B-pillar reinforcement plate is greater than or equal to 1800 MPa, and the tensile strength at the tensile strength weakened area SA may be 500 MPa-1000 MPa.

[0148] In this way, the hot-formed soft zone parts can significantly improve the mechanical properties such as tensile strength and yield strength of the parts that require high strength, so as to achieve the effect of being able to withstand greater impact force. At the same time, it can also make the parts that require low strength have lower tensile strength and yield strength, so as to achieve the effect of energy absorption and collapse during collision. The combination of the two methods can effectively improve the collision safety performance of the car and achieve lightweighting of the car. The same hot-formed part has different mechanical properties in different areas, and the performance of the parts in the whole vehicle collision test is optimized. Specifically, the door ring body 1 adopts the hot-formed soft zone process, which can not only meet the relatively high tensile strength requirements of the upper section 11 of the A-pillar reinforcement plate and the lower section 14 of the B-pillar reinforcement plate, but also meet the relatively low tensile strength requirements of the tensile strength weakened area SA and other positions. It has a simple structure and strong practicality.

[0149] It should be understood that, without violating the design concept of the present invention, similar to the previous embodiment, in this embodiment, Figure 4 As shown, the door ring can also be provided with reinforcements, such as composite reinforcements 2, A-pillar reinforcement plate support plates 3, B-pillar reinforcement plate support plates 4, A-pillar upper hinge reinforcement plates, A-pillar lower hinge reinforcement plates 6, etc. Dew point control and other technologies can also be used, which will not be described in detail here.

[0150] An embodiment of the present invention further provides a vehicle comprising the door knocker of the above embodiment.

[0151] Specifically, the vehicle includes a side panel, and the side panel includes a door knocker, a sheet metal inner panel, a sheet metal outer panel, etc. The vehicle has all the beneficial effects of the door knocker, which will not be described in detail here.

[0152] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A door knocker, characterized in that: The door knocker comprises a door knocker body (1), which is formed by welding a plurality of structural parts and then hot-forming. After hot-forming, the door knocker body (1) comprises an A-pillar reinforcement plate upper section (11), an A-pillar reinforcement plate lower section (12), a door sill structure section (13), a B-pillar reinforcement plate lower section (14) and a B-pillar reinforcement plate upper section (15), which correspond to the plurality of structural parts and are connected end to end. The tensile strength of the door knocker body (1) at least in the A-pillar reinforcement plate upper section (11) and the B-pillar reinforcement plate lower section (14) is greater than or equal to 1800 MPa.

2. The door knocker according to claim 1, characterized in that The door knocker body (1) has a tensile strength weakened area (SA); the threshold structure section (13) comprises a first extension section (131) and a second extension section (132); the first extension section (131) is extended in a horizontal direction and forms at least a part of the threshold; the second extension section (132) is extended in a vertical direction and is connected to the lower section (14) of the B-pillar reinforcement plate; The tensile strength of the material used for the structural member corresponding to the threshold structural section (13) among the plurality of structural members is configured to be the minimum, so that the door ring body (1) after thermoforming forms the tensile strength weakened area (SA) in the threshold structural section (13).

3. A door knocker, characterized in that: The door knocker comprises a door knocker body (1), wherein the door knocker body (1) is integrally thermoformed from a material of a single grade and / or thickness; the door knocker body (1) after thermoforming has a tensile strength greater than or equal to 1800 MPa at least in the upper section (11) of the A-pillar reinforcement plate and the lower section (14) of the B-pillar reinforcement plate.

4. The door knocker according to claim 3, characterized in that The door knocker body (1) adopts a hot forming soft zone process so that the door knocker body (1) is formed with a tensile strength weakened area (SA), and the door knocker body (1) comprises a first extension section (131) and a second extension section (132); the first extension section (131) is extended in a horizontal direction and forms at least a part of a door sill; the second extension section (132) is extended in a vertical direction and forms at least a part of a B-pillar; the tensile strength weakened area (SA) at least covers a part of the first extension section (131) connected to the second extension section (132) and an end of the second extension section (132) connected to the first extension section (131).

5. The door knocker according to any one of claims 1 to 4, characterized in that: In the hot forming process of the door knocker body (1), the dew point of the heating device is controlled so that the dew point of the protective gas in the heating device is lower than or equal to -10°C.

6. The door knocker according to claim 5, characterized in that The heating device has a water vapor removal unit, which is arranged on a supply path of the protective gas. In the hot forming process of the door ring body (1), the dew point of the heating device is controlled by the water vapor removal unit.

7. The door knocker according to any one of claims 1 to 4, characterized in that: The door knocker further includes at least one reinforcement member; wherein at least one of the reinforcement members is connected to the door ring body (1) after being thermoformed after being formed; And / or, wherein at least one of the reinforcement members is connected to the door ring body (1) before thermoforming in the form of a lower sheet.

8. The door knocker according to claim 7, characterized in that At least one of the reinforcements comprises a composite reinforcement (2), the composite reinforcement (2) after molding is connected to the door ring body (1) after thermoforming, and the door ring body (1) is provided with the composite reinforcement (2) corresponding to at least a bent portion of the upper section (11) of the A-pillar reinforcement plate close to the upper end; And / or, at least one of the reinforcement members comprises an A-pillar reinforcement plate support plate (3), the A-pillar reinforcement plate support plate (3) being arranged corresponding to the A-pillar reinforcement plate upper section (11) and connected to the A-pillar reinforcement plate upper section (11); When at least one of the reinforcements includes the composite reinforcement (2) and the A-pillar reinforcement plate support plate (3), the composite reinforcement (2), the A-pillar reinforcement plate support plate (3) and the A-pillar reinforcement plate upper section (11) are sequentially distributed and connected.

9. The door knocker according to claim 8, characterized in that The composite material reinforcement (2) comprises a frame (21), a connecting piece (22) and a foam glue (23); the frame (21) is provided with a plurality of the connecting pieces (22) correspondingly, the connecting pieces (22) are partially embedded in the frame (21) and partially exposed to form a connecting portion (221), the foam glue (23) is provided on the circumferential surface of the frame (21), and the composite material reinforcement (2) is connected to the door knocker body (1) via the connecting portion (221) and the foam glue (23); And / or, the door knocker body (1) is formed with a receiving cavity for receiving the composite material reinforcement (2), and a positioning protrusion (25) is provided on a surface of the composite material reinforcement (2) opposite to the inner wall of the receiving cavity.

10. A vehicle, characterized in that: Comprising the door knocker as claimed in any one of claims 1 to 9.

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