CN-122009067-A - Multi-material composite automobile anti-collision Liang Qingliang structure

CN122009067ACN 122009067 ACN122009067 ACN 122009067ACN-122009067-A

Abstract

The invention discloses a multi-material composite automobile anti-collision Liang Qingliang structure, and belongs to the technical field of automobile anti-collision beams. The anti-collision beam comprises an anti-collision beam assembly and energy absorption boxes symmetrically fixed at two ends of the anti-collision beam assembly; one end, away from the anti-collision beam assembly, of the energy absorption box is provided with a mounting flange; the anti-collision beam assembly comprises an intermediate bearing framework layer, a front impact-resistant layer and a rear energy-absorbing buffer layer, wherein the front impact-resistant layer is fixed on the front surface of the intermediate bearing framework layer, the front impact-resistant layer is integrally provided with a flanging, and the flanging is fully coated on the outer edge of the intermediate bearing framework layer; the multi-material composite automobile anti-collision Liang Qingliang structure can realize grading function matching of front penetration resistance load dispersion and rear energy absorption buffer protection, and has light weight effect and collision safety performance.

Inventors

LU HONGPENG
SUN GUOQIANG
YAN BEN

Assignees

山西宇傲汽车部件有限公司

Dates

Publication Date: 20260512
Application Date: 20260320

Claims (9)

1. The multi-material composite automobile anti-collision Liang Qingliang structure comprises an anti-collision beam assembly and energy absorption boxes symmetrically fixed at two ends of the anti-collision beam assembly, wherein one end, far away from the anti-collision beam assembly, of each energy absorption box is provided with a mounting flange, and the anti-collision beam assembly is characterized by comprising: the middle bearing framework layer is of an integrally extruded aluminum alloy structure, and flange faces fixed with the energy absorption boxes are arranged at two ends of the middle bearing framework layer; the front impact-resistant layer is fixed on the front surface of the middle bearing framework layer, and is integrally provided with a flanging which is fully coated on the outer edge of the middle bearing framework layer; The rear energy absorption buffer layer is fixed on the rear surface of the middle bearing framework layer, and the edge of the rear energy absorption buffer layer is attached to the edge of the front impact resistant layer; the front impact resistant layer and the rear energy absorption buffer layer are both made of a strip-shaped melt through LFT-D on-line die pressing, The strip-shaped melt of the front impact-resistant layer comprises a first matrix, wherein a first hybrid fiber body is mixed in the first matrix, the total fiber mass fraction of the first hybrid fiber body is 45% -55%, the first hybrid fiber body comprises S-grade glass fibers and T700-grade carbon fibers, the mass ratio of the S-grade glass fibers is 85% -90%, the on-line cutting length of the fibers of the first hybrid fiber body is 20-25mm, and the average value of the retention length after molding is more than or equal to 12mm; The ribbon-shaped melt of the rear energy absorption buffer layer comprises a second matrix, wherein a second hybrid fiber body is mixed in the second matrix, the total fiber mass fraction of the second hybrid fiber body is 35% -45%, the second hybrid fiber body comprises high-modulus E glass fibers and T700-grade carbon fibers, the high-modulus E glass fibers account for 70% -78% in terms of the weight ratio, the on-line cutting length of the high-modulus E glass fibers is 18-25mm, the on-line cutting length of the T700-grade carbon fibers is 12-18mm, the average value of the retention length of the high-modulus E glass fibers is more than or equal to 11mm, and the average value of the retention length of the T700-grade carbon fibers is more than or equal to 9mm after molding.
2. The multi-material composite automobile crash-proof Liang Qingliang structure of claim 1, wherein the first substrate comprises a first bearing body formed by toughening modified polypropylene or low-viscosity toughening PA6, 10% -12% of maleic anhydride grafted polyolefin elastomer is added in the first bearing body, the second substrate comprises a second bearing body formed by toughening modified PA6 or PA66, 8% -10% of maleic anhydride grafted elastomer is added in the second bearing body, and the elastic modulus of the substrate is 2.5-3GPa.
3. The multi-material composite automobile anti-collision Liang Qingliang structure according to claim 1, wherein the middle bearing skeleton layer is a multi-cavity section bar formed by integrally extruding 6061-T6 or 7075-T6 aluminum alloy, a plurality of dovetail clamping grooves are prefabricated on the rear side surface of the multi-cavity section bar, dovetail tenons clamped with the dovetail clamping grooves are formed on the outer surface of the rear energy absorption buffer layer in a compression molding mode, an epoxy structural adhesive layer with the thickness of 0.2-0.3mm is arranged between the front impact resistant layer and the middle bearing skeleton layer, and an epoxy structural adhesive layer with the thickness of 0.15-0.3mm is arranged between the rear energy absorption buffer layer and the middle bearing skeleton layer.
4. The multi-material composite automobile anti-collision Liang Qingliang structure of claim 1, wherein the front impact-resistant layer is 1.5-2.5mm thick, the front impact-resistant layer is of an arc-shaped plate structure matched with the front face of the automobile body, the rear energy-absorbing buffer layer is 2.5-4mm thick, and the rear side of the rear energy-absorbing buffer layer is integrally formed with longitudinal reinforcing ribs.
5. The multi-material composite automobile anti-collision Liang Qingliang structure according to claim 1, wherein the energy-absorbing box comprises a metal crumple skeleton with induction crumple grooves, the inner surface of the metal crumple skeleton is filled with a porous energy-absorbing body in an interference mode, the outer portion of the metal crumple skeleton is coated and bonded with a fiber reinforced coating formed by LFT-D compression molding, the induction crumple grooves are distributed at equal intervals along the axial direction of the energy-absorbing box, and the groove depth is gradually increased from the front end to the rear end.
6. The multi-material composite automotive crash-proof Liang Qingliang structure of claim 1, wherein the front impact-resistant layer and the rear energy-absorbing buffer layer are disposed between the flange faces at opposite ends.
7. The multi-material composite automobile anti-collision Liang Qingliang structure according to claim 1 is characterized in that the front impact-resistant layer and the rear energy-absorbing buffer layer fully cover the middle bearing framework layer, a counter bore is formed in a flange hole of the front impact-resistant layer, which is opposite to the flange surface, the rear energy-absorbing buffer layer is opposite to the flange surface, a groove seat is formed in the rear energy-absorbing buffer layer, one end of the energy-absorbing box is embedded into the groove seat and is attached to the flange surface, the energy-absorbing box is fixed to the flange surface through bolts and nuts, and nuts of the bolts are arranged on the inner side of the counter bore.
8. The multi-material composite automobile anti-collision Liang Qingliang structure of claim 1, wherein a glass fiber insulating gasket is arranged between the energy absorption box and the flange surface.
9. The multi-material composite automotive crash-Liang Qingliang structure of claim 1 wherein said front impact-resistant layer is provided with a low-velocity crash-weakening groove outside the region of the crash box.

Description

Multi-material composite automobile anti-collision Liang Qingliang structure Technical Field The invention particularly relates to a multi-material composite automobile anti-collision Liang Qingliang structure, and belongs to the technical field of automobile anti-collision beams. Background The automobile anti-collision beam is a core component of a passive safety system of an automobile body and plays key roles of collision load conduction, energy absorption, protection of an automobile body longitudinal beam, passengers and a new energy automobile battery pack; with the rapid development of the new energy automobile industry, the dual requirements of the automobile body weight reduction and the collision safety protection are urgent, an existing anti-collision beam such as CN118753197B, a double anti-collision safety automobile anti-collision beam structure is disclosed, the anti-collision safety automobile anti-collision beam structure comprises two main anti-collision beams and auxiliary anti-collision beams which are distributed in parallel, connecting beams which are welded integrally are arranged on two sides of each auxiliary anti-collision beam, an energy absorption box is arranged outside each connecting beam, the structure improves the safety performance of an automobile through the double anti-collision structure of the main anti-collision beam and the auxiliary anti-collision beam, the main anti-collision beam can buffer and stretch in a certain range, the impact force during the collision of the automobile is greatly reduced, the stability of the main anti-collision beam is ensured, but the main anti-collision beam and the auxiliary anti-collision beam are of double mechanical structures, the whole quality is overweight, the existing anti-collision beam has the defects of low specific strength of single steel anti-collision beam, overlarge self weight, high cost of single aluminum alloy anti-collision beam, low impact toughness, easy occurrence of failure in low-speed collision, easy occurrence of maintenance, easy realization of a plurality of anti-collision, easy realization of a high possibility of a high-penetration effect, easy realization of a composite material of a front-collision layer and a composite material with a high-expansion layer of a steel layer, a high-expansion coefficient of the anti-collision layer, a high-corrosion effect, and a high-expansion layer, and a high-load-loss composite resistance layer, and a high-weight, and a high-quality composite material, and a special-quality anti-corrosion layer, high-expansion layer, and a high-quality, and, further, compared, there is a performance shortboard or cost redundancy. Disclosure of Invention In order to solve the problems, the invention provides a multi-material composite automobile anti-collision Liang Qingliang structure, which adopts a front impact-resistant layer and a rear energy-absorbing buffer layer to be fused with an intermediate framework, can realize grading function matching of front penetration-resistant dispersed load and rear energy-absorbing buffer protection, and has light weight effect and collision safety performance. The invention discloses a multi-material composite automobile anti-collision Liang Qingliang structure, which comprises an anti-collision beam assembly and energy absorption boxes symmetrically fixed at two ends of the anti-collision beam assembly, wherein one end of each energy absorption box, which is far away from the anti-collision beam assembly, is provided with a mounting flange, and the anti-collision beam assembly comprises: The middle bearing framework layer adopts a high-strength aluminum alloy material as a main bearing structure of an anti-collision beam, bears the transverse transmission and longitudinal bearing of collision force, and provides stable assembly reference and connection interface for the front impact-resistant layer and the rear energy-absorbing buffer layer; the front impact-resistant layer is fixed on the front surface of the middle bearing framework layer, and is integrally provided with a flanging which is fully coated on the outer edge of the middle bearing framework layer; The rear energy absorption buffer layer is fixed on the rear surface of the middle bearing framework layer, and the edge of the rear energy absorption buffer layer is attached to the edge of the front impact resistant layer; the front impact resistant layer and the rear energy absorption buffer layer are both made of a strip-shaped melt through LFT-D on-line die pressing, The ribbon-shaped melt of the front impact-resistant layer comprises a first matrix, wherein a first hybrid fiber body is mixed in the first matrix, the first hybrid fiber body adopts S-level glass fibers as a main phase, and T700-level carbon fibers as a hybrid fiber system of an auxiliary phase, specifically, the total fiber mass fraction of the first hybrid fiber body is 45% -55%, the first hybrid fiber body compris