CN118478947A - B-pillar assembly, manufacturing method thereof and automobile - Google Patents

Abstract

The application relates to the technical field of automobile part manufacturing, and discloses a B-pillar assembly, a manufacturing method thereof and an automobile, wherein the B-pillar assembly comprises an outer plate and a reinforced inner plate, the reinforced inner plate is arranged on the inner side of the outer plate, the reinforced inner plate is fixedly connected with the outer plate through adhesive, the outer plate is a high-strength steel plate, the reinforced inner plate is formed by hot pressing a thermoplastic carbon fiber composite material plate, the thermoplastic carbon fiber composite material plate comprises a plurality of prepreg tape layers which are sequentially paved, each prepreg tape layer is formed by paving a plurality of prepreg tape cutting blocks at different paving angles, and in the thermoplastic carbon fiber composite material plate, the thickness of the position corresponding to a pit is thicker than that of other positions; the beneficial effects of the application are as follows: can guarantee sufficient intensity, toughness and lightweight effect, effectively solve the problem of stress concentration, and be convenient for make and assembly, can effectively improve production efficiency.

Description

B-pillar assembly, manufacturing method thereof and automobile

Technical Field

The application relates to the technical field of automobile part manufacturing, in particular to a B-pillar assembly, a manufacturing method thereof and an automobile.

Background

The B column assembly is a second column in the automobile body, is positioned between the front door and the rear door, and is an important structural member related to collision and the rigidity of the automobile body.

Currently, B-pillar assemblies are typically composed of an inner panel, an outer panel, and a reinforcing panel, all made of steel plates. With the development of lightweight designs, attempts have been made in the industry to introduce carbon fiber composite materials (CFRP, carbon Fiber Reinforced Polymer) into B-pillar assemblies, such as the one disclosed in the patent of CN104986226a, wherein the outer and inner panels of the B-pillar assembly comprise metal layers and carbon fiber composite layers, but the manufacturing and assembly efficiency is low and stress concentration is easy to occur due to the large number of components and the connection between different materials involved.

Disclosure of Invention

An object of the present application is to provide a B-pillar assembly which can ensure sufficient strength, toughness and lightweight effects, is convenient to manufacture and assemble, can effectively improve production efficiency, and can effectively solve the problem of stress concentration. Another object of the present application is to provide a method for manufacturing the B-pillar assembly. It is yet another object of the present application to provide an automobile.

The application aims at realizing the following technical scheme:

A B-pillar assembly, comprising:

The outer plate comprises an outer plate body and first side edges which are respectively arranged along the front edge and the rear edge of the outer plate body and are protruded towards the inner side, and the outer plate body is provided with a profiling; and

The reinforced inner plate comprises an inner plate body and second side edges which are respectively arranged along the front edge and the rear edge of the inner plate body and protrude towards the inner side, pits are formed in positions, corresponding to the profiling, of the inner plate body, the reinforced inner plate is arranged on the inner side of the outer plate body, the inner plate body is attached to the outer plate body, the pits are matched and spliced with the profiling, the second side edges are attached to the first side edges, and the reinforced inner plate and the outer plate are fixedly connected through adhesive;

The outer plate is a high-strength steel plate, the reinforced inner plate is formed by hot pressing a thermoplastic carbon fiber composite material plate, the thermoplastic carbon fiber composite material plate comprises a plurality of layers of prepreg tape layers which are sequentially paved, each prepreg tape layer is formed by paving a plurality of prepreg tape cutting blocks at different angles, and in the thermoplastic carbon fiber composite material plate, the thickness of the position corresponding to the pit is thicker than that of other positions.

In some embodiments of the present application, each of the prepreg tape layers has a reference direction, and an included angle between a laying angle of each of the prepreg tape cut pieces in the same prepreg tape layer and the reference direction is not greater than 30 °.

In some embodiments of the application, the prepreg tape cut is a PA 6-based unidirectional tape with a carbon fiber ratio of (50-60) w%.

In some embodiments of the present application, the outer plate body is provided with at least two profiling, and the inner plate body is provided with a plurality of pits corresponding to the profiling one by one;

The at least two profiling devices comprise a first profiling device and a second profiling device, wherein the first profiling device protrudes towards the inner side, the top end of the first profiling device is close to the top side of the outer plate body and extends downwards along the vertical direction, the second profiling device is adjacently arranged below the first profiling device, and the second profiling device protrudes towards the outer side and is in a sinking table shape.

In some embodiments of the present application, a third side edge protruding towards the inner side is provided along the upper edge of the inner plate body, and the third side edge connects the top ends of the two second side edges;

The recess provided in correspondence with the first profiling is defined as a first recess, which first profiling extends at least partly upwards from the top side of the first recess.

In some embodiments of the present application, a third die is further disposed on the outer plate body, the third die protrudes towards the outer side, the third die is disposed along the front edge or the rear edge of the outer plate body, one end of the third die is communicated with the bottom side of the second die, and the other end of the third die extends downwards to the bottom side of the outer plate body.

In some embodiments of the application, the bottom of the outer panel protrudes at least partially downward from the bottom side of the reinforced inner panel.

In some embodiments of the application, the outer plate is made of Nb-V high-strength steel.

In some embodiments of the application, the reinforced inner panel is inserted into the outer panel by an interference fit, and the second side edge is elastically abutted against the first side edge.

In some embodiments of the present application, the second side edge includes curved surfaces and/or flat surfaces connected by rounded corners in smooth transition, and the radius of each curved surface and the rounded corner is 7-10 mm.

A method of manufacturing a B-pillar assembly, comprising:

Forming an outer plate by stamping a high-strength steel plate;

Cutting Cheng Duokuai the prepreg tape into prepreg tape cutting blocks, and paving a plurality of prepreg tape cutting blocks at different angles to form a prepreg tape layer, wherein a thermoplastic carbon fiber composite material plate is formed after the multi-layer prepreg tape layer is paved;

hot-press molding a thermoplastic carbon fiber composite material plate into a reinforced inner plate;

and glue layers are arranged on the inner surface of the outer plate and the outer surface of the reinforced inner plate, and the reinforced inner plate is inserted into the outer plate to realize bonding connection between the outer plate and the reinforced inner plate.

In some embodiments of the present application, the outer surface of the reinforced inner plate is glued by immersing the outer plate in the structural adhesive;

And (3) glue coating is realized by dispensing glue or spraying glue-coated mucus on the inner surface of the outer plate.

An automobile comprising the B-pillar assembly.

Compared with the prior art, the B-pillar assembly, the manufacturing method and the automobile have the following technical effects:

1. due to the introduction of the carbon fiber composite material, the light weight effect can be realized;

2. Through the mutual synergistic effect of material selection and structure optimization of the outer plate and the reinforced inner plate, enough strength and toughness can be ensured, the intrusion quantity and intrusion speed of the B column can be effectively reduced, and the anti-collision performance can be improved;

3. Only set up the planking and strengthen the inner panel can, need not to set up too much part, and planking and strengthen the inner panel and assemble again after can shaping respectively, strengthen the inner panel and adopt the piecemeal unequal thickness to spread to cover, further improve mechanical properties, strengthen the inner panel after the shaping and link to each other with the planking bonding, make and assemble the simplification, can effectively improve production efficiency.

Drawings

The present application is described in further detail below in conjunction with the drawings and preferred embodiments, but it will be appreciated by those skilled in the art that these drawings are drawn for the purpose of illustrating the preferred embodiments only and thus should not be taken as limiting the scope of the application. Moreover, unless specifically indicated otherwise, the drawings are merely intended to conceptually illustrate the compositions or constructions of the described objects and may contain exaggerated representations, and the drawings are not necessarily drawn to scale.

FIG. 1 is a schematic illustration of a B-pillar assembly according to some embodiments of the application;

FIG. 2 is an exploded schematic view of a B-pillar assembly according to some embodiments of the present application;

FIG. 3 is a schematic structural view of an outer panel of a B-pillar assembly according to some embodiments of the present application;

FIG. 4 is a schematic structural view of a reinforced inner panel of a B-pillar assembly according to some embodiments of the present application;

FIG. 5 is a schematic comparison of a prepreg tape lay-up method according to some embodiments of the application and a prior art monolith lay-up;

FIG. 6 is a graph of the crushing amount of example 1 and comparative example 1;

Fig. 7 is a contact force curve of example 1 and comparative example 1.

In the figure, 10, an outer plate; 11. an outer plate body; 111. profiling; 1111. a first profiling; 1112. a second profiling; 1113. a third profiling; 12. a first side edge;

20. Reinforcing the inner panel; 21. an inner plate body; 211. pit; 2111. a first pit; 22. a second side edge; 23. and a third side edge.

Detailed Description

Preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely illustrative, exemplary, and should not be construed as limiting the scope of the application.

First, the top, bottom, upper, lower, inner, outer, etc. orientations referred to herein refer to the positional relationship with respect to the passenger compartment after the B-pillar assembly is mounted to the vehicle body; they are relative concepts and can thus be varied according to the different positions they are in and the different practical conditions. These and other orientations, therefore, are not to be considered limiting.

In the description of the present application, it should also be understood that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example, unless otherwise explicitly stated and defined; can be directly connected or indirectly connected through an intermediate medium.

It should be noted that the term "comprising" does not exclude other elements or steps and the "a" or "an" does not exclude a plurality.

Furthermore, it should also be noted that any individual feature described or implicit in the embodiments herein, or any individual feature shown or implicit in the drawings, can still be combined between these features (or their equivalents) to obtain other embodiments of the application not directly mentioned herein.

It should also be understood that the terms "first," "second," and the like are used herein to describe various information, but that such information should not be limited to these terms, which are used merely to distinguish one type of information from another. For example, a "first" message may also be referred to as a "second" message, and similarly, a "second" message may also be referred to as a "first" message, without departing from the scope of the application.

It should be noted that in different drawings, the same reference numerals indicate the same or substantially the same components.

Referring to fig. 1-4, an embodiment of the present application provides a B-pillar assembly comprising: the outer panel 10 and the reinforced inner panel 20. The planking 10 is high-strength steel sheet, strengthen the inner panel 20 and form through thermoplastic carbon fiber composite board hot pressing, strengthen the inboard of planking 10 to locate the inner panel 20, the planking 10 includes planking body 11 and along the front and back both sides of planking body 11 along setting up and towards the bellied first side edge 12 of inboard, strengthen the inner panel 20 and include the inner panel body 21 and along the front and back both sides of the inner panel body 21 along setting up and towards the bellied second side edge 22 of inboard, strengthen the inboard that the planking 10 was located to the inner panel 20, the inner panel body 21 laminating with planking body 11, the second side edge 22 laminating with first side edge 12, and adopt the viscose fixed continuous between strengthening the inner panel 20 and the planking 10.

Because of this, because optimize the self shape of planking 10 and strengthening inner panel 20, both have the cavity that opens towards the inboard, strengthen the inner panel 20 cooperation and locate the planking 10 inboard after, be formed with the cavity that opens towards the inboard on the B post assembly promptly, and planking 10 adopts high-strength steel sheet, strengthen the inner panel 20 and adopt carbon fiber composite material, and locate the inboard of planking 10 through the sticky fixation, can enough intensity, toughness and lightweight effect can be guaranteed, need respectively with carbon fiber composite material in the prior art on steel inner panel, planking, and need through inner panel, planking mutual welding, in order to construct the inner cavity of enclosing between the two, only need prepare respectively planking and strengthen the inner panel after, the rethread structural adhesive bond can accomplish the assembly, moreover, the steam generator is simple in structure, and the assembly is simplified, can adapt to the faster production of automobile trade better, and need not welding process, can effectively avoid setting up the welding position and the stress concentration problem that leads to through welding process.

In addition, because the reinforced inner plate 20 is formed by hot pressing a thermoplastic carbon fiber composite plate and is fixedly connected to the outer plate 10 through adhesive, compared with the prior art that a steel reinforced plate is welded to the outer plate 10, the manufacturing process of the reinforced inner plate 20 is not an original stamping process any more, and irregular shapes such as process holes required by original stamping and welding parts required by assembly can be subjected to smooth treatment, so that stress concentration can be effectively reduced; meanwhile, the bonding process can not damage the fiber tissue, and the problem of stress concentration in mechanical connection can be further avoided.

Specifically, a thermoplastic carbon fiber composite material is selected, and compared with a thermosetting carbon fiber composite material, brittle fracture is not easy to occur in the collision working condition of an automobile; meanwhile, as the heat-resistant and heat-resistant composite material is only prepared by a hot-press molding mode, compared with the RTM molding process of the thermosetting composite material, the heat-resistant and heat-resistant composite material is high in production efficiency.

In this embodiment, the outer plate 11 is provided with a profiling 111, the inner plate 21 is provided with a pit 211 at a position corresponding to the profiling 111, and the pit 211 is matched with the profiling 111 for insertion; the number, the positions and the shapes of the profiling 111 and the pits 211 can be set according to specific installation requirements, and meanwhile the profiling 111-level pits 211 can effectively buffer collision; in the present embodiment, since the reinforcement inner panel 20 and the outer panel 10 are fixed by bonding, the profiling 111 and the concave pit 211 can be positioned preliminarily in the bonding process, thereby improving the assembly efficiency and the assembly accuracy.

Specifically, the thermoplastic carbon fiber composite material plate comprises a plurality of layers of prepreg tape layers which are sequentially paved; further, in this embodiment, in order to meet the stress requirements at each position of the reinforced inner plate 20 and reduce the phenomena of wrinkling, breakage and the like caused by the laying process of the prepreg tape layers, each prepreg tape layer is laid in a block manner, that is, each prepreg tape layer is formed by laying a plurality of prepreg tape cutting blocks, a plurality of laying starting points are set when each prepreg tape layer is laid, each prepreg tape cutting block is laid at different laying angles, rather than one-time laying of the prepreg tape layer to the bottom at one angle, compared with the whole block laying, the disqualification rate of the laying can be reduced, and the mechanical property uniformity of the reinforced inner plate 20 is ensured; on the premise of block paving, the embodiment of the application also adopts unequal thickness paving, namely the layers of the prepreg tape cutting blocks paved at different positions in the thermoplastic carbon fiber composite material plate are different, and as the pits 211 are positioned at the positions with concentrated stress during collision, more layers of prepreg tape cutting blocks are paved at the pits 211, so that the thickness of the positions is thicker than that of other positions, and the fracture resistance of the integral structure can be effectively improved.

It should be noted that the number of prepreg tape cutting blocks in each prepreg tape layer should be controlled, so that each prepreg tape layer is prevented from being divided into too many blocks, and the prepreg tape cutting blocks are formed by cutting the prepreg tape along the fiber direction, so that the mechanical properties of the cut prepreg tape cutting blocks are not affected.

In this embodiment, since the split laying is adopted, a plurality of small laying machines can be adopted to simultaneously carry out the laying operation on the same prepreg tape layer, and compared with the case that one large laying machine is adopted to carry out the whole block laying, the laying effect can be improved, and meanwhile, the laying efficiency can be greatly improved.

In some embodiments, a reference direction is set in each prepreg tape layer, wherein one prepreg tape cutting block is paved along the reference direction, and the deviation angle between the paving direction of each other prepreg tape cutting block and the reference direction is not more than 30 degrees; the laying direction of the prepreg tape cutting blocks in the same prepreg tape layer is basically kept in the same direction as the reference direction, deflection can be carried out within 30 degrees, the stress requirements of all positions can be met, and meanwhile, the overall mechanical property requirements of all layers of prepreg tape layers after the laying is finished can be ensured.

Illustratively, in some embodiments the number of lay-up layers of the prepreg tape is 18, the lay-up sequence is [ +45/-45/0/90/0/+45/-45/0/90] s, i.e., the lay-up angles are: +45°, -45 °,0 °, 90 °,0 °, +45°, -45 °,0 °, 90 ° and repeating the two rounds according to the angle of the spreading. The laying angle of each prepreg tape actually refers to an angle in a reference direction of the prepreg tape, that is, the angle is set according to the reference direction of each prepreg tape: laying in the forms of 45 degrees, -45 degrees, 0 degrees, 90 degrees, 0 degrees, +45 degrees, -45 degrees, 0 degrees and 90 degrees; based on this structure, the rigidity and bending resistance of the reinforced inner panel 20 are optimized, and the mechanical properties are uniform.

In other alternative embodiments, the number of plies of the prepreg tape may be set to a multiple of 4, such as 4, 8, 12 plies, etc., with a ply sequence of 0/90/45/-45 s.

As shown in fig. 5, in the course of 0 ° lay-up, a schematic diagram is shown on the left side of the prepreg tape layer when the prepreg tape layer is laid up in a monolith, wherein the arrow indicates the lay-up direction and the area of defective lay-up is marked with a black frame; the right side shows a schematic diagram when the prepreg tape layer is paved by adopting the block unequal thickness, wherein the arrow points to the paving direction, the prepreg tape layer is divided into three blocks to be paved, the middle arrow points to the reference direction, and the black frame is used for marking the area with unqualified paving, so that the coverage unqualified rate of the block paving is obviously reduced compared with that of the whole block paving.

Illustratively, the prepreg tape cut is a unidirectional prepreg tape cut.

Preferably, in some embodiments, the prepreg tape cut uses PA6 (Polyamide 6, collectively referred to as polyamide 6) based unidirectional tape with a carbon fiber content of (50-60) w%.

In some embodiments, in order to improve the anti-collision performance, at least two profiling 111 are arranged on the outer plate 11, and correspondingly, a plurality of pits 211 corresponding to the profiling 111 one by one are arranged on the inner plate 21; for convenience of description, two of the press molds 111 are respectively defined as a first press mold 1111 and a second press mold 1112, the first press mold 1111 protrudes toward the inner side, the top end of the first press mold 1111 is disposed near the top side of the outer plate body 11 and extends downward in the vertical direction, the whole is in a long strip shape, the second press mold 1112 is adjacently disposed below the first press mold 1111 and can be used for mounting a seat belt, the second press mold 1112 protrudes toward the outer side and is in a sinking table shape, and the first press mold 1111 and the second press mold 1112 protrude toward different sides, respectively, so that collision force can be effectively absorbed, and thus effective buffering can be performed.

Further, in some preferred embodiments, the upper edge of the inner plate body 21 is provided with a third side edge 23 protruding toward the inside, and the third side edge 23 connects the top ends of the two second side edges 22; defining the concave pits 211 provided corresponding to the first concave pits 1111 as first concave pits 2111, the first concave pits 1111 extend at least partially upward from the top side of the first concave pits 2111, i.e., the top ends of the first concave pits 2111 are provided penetrating through the top ends of the reinforced inner plate 20, as shown in fig. 1, and the overall strength can be further improved.

In some embodiments, the outer plate 11 is further provided with a third profiling 1113, the third profiling 1113 protrudes towards the outer side, the third profiling 1113 is arranged along the front edge or the rear edge of the outer plate 11, one end of the third profiling 1113 is communicated with the bottom side of the second profiling 1112, and the other end of the third profiling 1113 extends downwards to the bottom side of the outer plate 11; a specific embodiment of the placement of the third profiling 1113 along the front edge of the outer panel 11 is exemplarily shown in fig. 2. Experiments prove that the third profiling 1113 can effectively support the outer plate 10, transfer collision force, increase deformation, avoid tearing in the collision process and prevent B column invasion.

Alternatively, the bottom of the reinforcement inner panel 20 does not entirely cover the bottom of the outer panel 10, i.e., the bottom of the outer panel 10 is at least partially provided protruding from the bottom side of the reinforcement inner panel 20.

Compared with the prior art that a whole reinforcing plate is required to cover the outer plate 10, or two or more reinforcing plates are adopted to respectively locally reinforce different parts of the outer plate 10, the embodiment can meet the overall strength requirement by only arranging one reinforcing inner plate 20, so that the assembly is simplified, and the production efficiency is greatly improved.

Specifically, the outer plate 10 in some embodiments is made of Nb-V high-strength steel. Namely, two kinds of micro alloys of Nb-V are added, so that the strength-plastic product of the high-strength steel can reach 14-18GPa, the minimum strength can reach 1480MPa, and the elongation rate can reach 8%; the Nb is mainly used for inhibiting the recrystallization of austenite, the V is added to mainly play a role in precipitation strengthening, and the V is expensive and has higher economic cost, so that the production cost can be reduced by replacing the V with the composite addition of the microalloy element under the same strength and plastic toughness level; therefore, the Nb-V composite microalloy high-strength steel is beneficial to reducing the production cost and improving the comprehensive performance of the high-strength steel.

Illustratively, the main composition of the Nb-V high-strength steel in the examples of the present application is shown with reference to table 1.

Table 1Nb-V high-strength steel main chemical composition (wt.%)

In order to enable the reinforcement inner panel 20 to be tightly fitted with the outer panel 10, the reinforcement inner panel 20 is inserted into the outer panel 10 by interference fit; specifically, when the reinforcing inner panel 20 is pressed into the outer panel 10, the second side edge 22 is elastically deformed, and the second side edge 22 elastically abuts against the first side edge 12, thereby achieving an interference fit.

In this embodiment, since the carbon fiber composite plate is used as the reinforced inner plate 20, the steel reinforced plate in the conventional technology is replaced, and the second side edge 22 is bonded and connected, and no welding position is required to be set on the second side edge 22, in this embodiment, the second side edge 22 is configured to be smooth, that is, the second side edge 22 is connected by a plurality of curved surfaces or planes through smooth transition of rounded corners, and the radii of each curved surface and each rounded corner are all 7-10 mm; because the curved surface and the transition fillet are smoother, the manufacturing of the die and the winding of the carbon fiber tows are facilitated, the problems of wrinkling, uneven spreading, tearing and the like in the spreading process are avoided, and the production efficiency can be further improved.

In order to test the mechanical properties of the B-pillar assembly of the present application, the specific example 1 and comparative example 1 were each subjected to a related experimental test.

The B-pillar assembly structure in the embodiment 1 is shown in figure 1, the number of the laying layers of the prepreg tape layers is 18, and the laying sequence is [ +45/-45/0/90/0/+45/-45/0/90] s; whereas comparative example 1 differs from example 1 only in that: the material of the reinforced inner plate 20 is replaced by a steel plate, welding positions are respectively arranged on two side edges of the reinforced inner plate 20, and the reinforced inner plate 20 is connected with the outer plate 10 by welding.

More specifically, the outer panel 10 in comparative example 1 and example 1 were the same in thickness, and were each 1.5 mm, the reinforcing inner panel 20 in example 1 was 4.5 mm (thickness of regular region, irregular region was adaptively thickened), and the reinforcing inner panel 20 in comparative example 1 was 1.5 mm.

First, the B-pillar assemblies of example 1 and comparative example 1 were weighed, respectively, and according to the weighing results, it was found that: the weight reduction ratio of example 1 to comparative example 1 was 47.18%, i.e., the weight reduction effect of example 1 was greatly improved.

The rigidity of the B-pillar assemblies of example 1 and comparative example 1 was then tested by the test methods of axial stretching, compression, lateral bending, and three-point bending, respectively, and the specific results are shown in table 2.

Table 2 results of stiffness test

Project	Comparative example 1	Example 1
			Axial tensile stiffness value (N/mm)	295.74	357.14
Axial compression stiffness value (N/mm)	295.74	374.53
			Lateral bending stiffness value (N/mm)	7.22	14.88
Three-point bending stiffness value (N/mm)	32.57	62.10

From Table 2, it can be seen that, according to the statics analysis, the rigidity of example 1 is much higher than that of comparative example 1.

In addition, the crushing amount and the collision contact force of the B-pillar assembly were respectively tested by adopting a drop hammer impact method, and specific results are shown in fig. 6 and 7.

As can be seen from fig. 6, the crushing amount of example 1 was 14.13 mm less than that of comparative example 1, and the bending resistance of example 1 was much higher than that of the steel sheet; as can be seen from fig. 7, in example 1, the contact force peak value is 19107.14N when the rigid drop hammer is pressed down to 2.5ms during the drop hammer impact, while in comparative example 1, the contact force peak value is 14784.90N when the rigid drop hammer is pressed down to 1.2ms, and the contact force peak value of example 1 and the drop hammer is smaller than 4322.24N than the contact force peak value of comparative example 1 and the drop hammer, i.e., the bending resistance of example 1 is much higher than that of comparative example 1.

Some embodiments of the present application also provide a method of manufacturing a B-pillar assembly, comprising the steps of:

S1, forming an outer plate 10 by stamping by adopting a high-strength steel plate;

S2, sequentially paving a plurality of layers of prepreg tape layers in a different thickness mode to prepare a thermoplastic carbon fiber composite material plate, firstly cutting Cheng Duokuai prepreg tape into prepreg tape cutting blocks when paving each layer of prepreg tape layer, setting a plurality of different paving starting points according to the shape and mechanical property requirements of each part, and respectively paving the plurality of prepreg tape cutting blocks at set positions and angles to ensure that the thermoplastic carbon fiber composite material plate is paved with more layers of prepreg tape cutting blocks at the positions of the pits 211 relative to other positions;

S3, hot-press molding the thermoplastic carbon fiber composite material plate into a reinforced inner plate 20, wherein in the hot-press molding process, the thermoplastic carbon fiber composite material plate after layering is heated and softened firstly, then is placed into a lower die, the die is closed, the plate is pressed and molded, cooling and solidification are carried out, and finally the plate is taken out from the die to be trimmed and cut into holes, so that a final product is obtained;

s4, glue layers are arranged on the inner surface of the outer plate 10 and the outer surface of the reinforced inner plate 20, the reinforced inner plate 20 is pressed into the outer plate 10, and the outer plate 10 and the reinforced inner plate 20 are bonded and connected.

Specifically, the specific assembly method between the reinforced inner panel 20 and the outer panel 10 is: all the matching surfaces of the outer plate 10 and the reinforced inner plate 20 are coated with glue, wherein the reinforced plate is soaked in the structural glue solution to obtain a glue layer, the outer plate is glued or sprayed with fine glue through the glue coating matching surface set manually or by a robot, and the reinforced inner plate is pressed into the outer plate to realize preliminary tight fit, so that the assembly is completed after the glue solution is solidified.

Some embodiments of the present application also provide an automobile comprising any of the above B-pillar assemblies; the B-pillar assembly has all the beneficial effects of the B-pillar assembly, and is not described herein.

In summary, the B-pillar assembly, the manufacturing method and the automobile thereof in the embodiment of the application can ensure enough strength, toughness and light weight effects, are convenient to manufacture and assemble, can effectively improve the production efficiency, and solve the problem of stress concentration.

The present specification discloses the present application with reference to the accompanying drawings and also enables one skilled in the art to practice the application, including making and using any devices or systems, using suitable materials, and using any incorporated methods. The scope of the application is defined by the claims and includes other examples that occur to those skilled in the art. Such other examples should be considered to be within the scope of the claimed subject matter as determined by the claimed subject matter, provided that such other examples include structural elements that are not literally different from the literal language of the claimed subject matter, or include equivalent structural elements with insubstantial differences from the literal language of the claimed subject matter.

Claims (13)

1. A B-pillar assembly, comprising:

The outer plate comprises an outer plate body and first side edges which are respectively arranged along the front edge and the rear edge of the outer plate body and are protruded towards the inner side, and the outer plate body is provided with a profiling; and

The reinforced inner plate comprises an inner plate body and second side edges which are respectively arranged along the front edge and the rear edge of the inner plate body and protrude towards the inner side, pits are formed in positions, corresponding to the profiling, of the inner plate body, the reinforced inner plate is arranged on the inner side of the outer plate body, the inner plate body is attached to the outer plate body, the pits are matched and spliced with the profiling, the second side edges are attached to the first side edges, and the reinforced inner plate and the outer plate are fixedly connected through adhesive;

the outer plate is a high-strength steel plate, the reinforced inner plate is a thermoplastic carbon fiber composite plate, the thermoplastic carbon fiber composite plate comprises a plurality of layers of prepreg tape layers which are sequentially paved, each prepreg tape layer is formed by paving a plurality of prepreg tape cutting blocks at different angles, and in the thermoplastic carbon fiber composite plate, the thickness of the position corresponding to the pit is thicker than that of other positions.

2. The B-pillar assembly of claim 1, wherein each of said prepreg tape layers has a reference direction, wherein an angle between a lay-up angle of each of said prepreg tape cut blocks in the same prepreg tape layer and said reference direction is not more than 30 °.

3. The B-pillar assembly of claim 1, wherein the prepreg tape cutout is a unidirectional tape.

4. The B-pillar assembly according to claim 1, wherein at least two profiling is arranged on the outer plate body, and a plurality of pits which are in one-to-one correspondence with the profiling are arranged on the inner plate body;

The at least two profiling devices comprise a first profiling device and a second profiling device, wherein the first profiling device protrudes towards the inner side, the top end of the first profiling device is close to the top side of the outer plate body and extends downwards along the vertical direction, the second profiling device is adjacently arranged below the first profiling device, and the second profiling device protrudes towards the outer side and is in a sinking table shape.

5. The B-pillar assembly of claim 4, wherein a third side edge protruding toward the inside is provided along the upper edge of the inner panel body, the third side edge connecting the top ends of both the second side edges;

The recess provided in correspondence with the first profiling is defined as a first recess, which first profiling extends at least partly upwards from the top side of the first recess.

6. The B-pillar assembly of claim 4, wherein a third die is further provided on the outer panel body, the third die is protruded toward the outer side, the third die is provided along the front edge or the rear edge of the outer panel body, one end of the third die is communicated with the bottom side of the second die, and the other end of the third die extends downward to the bottom side of the outer panel body.

7. The B-pillar assembly of claim 6, wherein a bottom portion of the outer panel at least partially projects downwardly from a bottom side of the reinforced inner panel.

8. The B-pillar assembly of claim 1, wherein said outer panel is of Nb-V high strength steel.

9. The B-pillar assembly of claim 1, wherein the reinforcing inner panel is inserted into the outer panel by an interference fit, the second side edge resiliently abutting the first side edge.

10. The B-pillar assembly of claim 1, wherein the second side edge includes curved surfaces and/or flat surfaces connected by a smooth transition of rounded corners, and the radius of each of the curved surfaces and the rounded corners is 7-10 mm.

11. The method of manufacturing a B-pillar assembly according to any one of claims 1-10, comprising:

Forming an outer plate by stamping a high-strength steel plate;

Cutting Cheng Duokuai the prepreg tape into prepreg tape cutting blocks, and paving a plurality of prepreg tape cutting blocks at different angles to form a prepreg tape layer, wherein a thermoplastic carbon fiber composite material plate is formed after the multi-layer prepreg tape layer is paved;

hot-press molding a thermoplastic carbon fiber composite material plate into a reinforced inner plate;

and glue layers are arranged on the inner surface of the outer plate and the outer surface of the reinforced inner plate, and the reinforced inner plate is inserted into the outer plate to realize bonding connection between the outer plate and the reinforced inner plate.

12. The method of manufacturing a B-pillar assembly according to claim 11, wherein the outer surface of the reinforcement inner panel is rubberized by dipping an outer panel in a structural adhesive;

And (3) glue coating is realized by dispensing glue or spraying glue-coated mucus on the inner surface of the outer plate.

13. An automobile comprising the B-pillar assembly of any one of claims 1-10.