Search

CN-121973851-A - Cold-pressed integrated rear auxiliary frame and manufacturing process thereof

CN121973851ACN 121973851 ACN121973851 ACN 121973851ACN-121973851-A

Abstract

The invention discloses a cold-press integrated rear auxiliary frame and a manufacturing process thereof, wherein a main body frame structure of the rear auxiliary frame comprises a U-shaped frame, a rear beam and a lower cross beam, wherein the U-shaped frame is formed by adopting a round pipe integrated cold press, the rear beam is a round straight pipe, welding deformation sources are reduced, the whole welding precision is improved, the structure is simpler than that of a traditional punching weldment, the positions of a sleeve pipe and a bracket structure which are sequentially installed can be mutually utilized and assisted in positioning, the available space of the bottom arrangement is more sufficient, compared with the preparation process of the traditional punching welding auxiliary frame, the manufacturing process of the auxiliary frame reduces the number of welding seams, improves the strength, the rigidity and the fatigue strength, reduces the development cost of a die, a tool and a fixture, reduces the production investment of products, improves the competitive power of enterprises, increases profits, the structural strength of the obtained rear auxiliary frame meets the requirement, and compared with the punching welding, the welding task amount is reduced by about 30 percent, and the weight is reduced by 10-15 percent.

Inventors

  • XIONG LEI
  • XIAO WEI
  • FENG QICHENG
  • LIAO YANG
  • LIU QI

Assignees

  • 东实(武汉)实业有限公司

Dates

Publication Date
20260505
Application Date
20251229

Claims (8)

  1. 1. The utility model provides a cold-pressed shape integral type back sub vehicle frame, a serial communication port, including the main body frame, the main body frame includes several font frame and back beam, several font frame includes upper horizontal portion, two side bend portions and extend respectively in every side bend portion outsides and be curved outer edge portion, the back beam welds between the middle part opposite sides of two outer edge portions, the main body frame adopts the pipe cold press shaping, side bend portion is protruding crooked setting towards the planar upside that main body frame was located, the back beam is the circular straight tube, the apex angle punishment welding that upper horizontal portion and every side bend portion were passed through has the front suspension installing support, the welding down beam between the downside that two side bend portions are close to outer edge portion, the welding back suspension installing support between down beam and the back beam, the side welding connecting rod installing support of side bend portion, the upper side welding suspension arm installing support of outer edge portion, the one end upside that is close to upper horizontal portion of side bend portion, outer edge portion has the sleeve pipe at one side that is close to the centre of a curve respectively, wherein, two sleeve upside welding that are close to side bend portion department has the sleeve pipe fixing base, the front suspension installing support, the both ends and the front suspension installing support of homonymy side bend portion of sleeve pipe respectively.
  2. 2. The cold-pressed integrated rear subframe as claimed in claim 1, wherein an arc-shaped groove matched with the sleeve is formed on one side of the outer edge part close to the bending center, and the arc-shaped groove is of a semicircular structure.
  3. 3. A process for manufacturing a cold-formed integral rear subframe as claimed in claim 2, comprising the steps of: s1, independently manufacturing a rectangular frame, a rear beam and two front suspension mounting brackets with required sizes; s2, welding the structure in the step S1 into a main body frame whole; s3, welding a sleeve on the main body frame, wherein a sleeve fixing seat is correspondingly arranged on the sleeve close to the upper transverse part, and window welding is carried out between the top of the sleeve fixing seat and the sleeve; s4, continuously welding a connecting rod mounting bracket and a suspension arm mounting bracket on the main body frame; And S5, welding a lower cross beam between the side bent parts, and then welding a rear suspension mounting bracket to obtain the cold-pressed integrated rear auxiliary frame.
  4. 4. A process for manufacturing a cold-pressed integrated rear subframe as claimed in claim 3, wherein in step S1, the zigzag frame is manufactured by: a1, cutting a straight tube; A2, preforming a U-shaped bent pipe; a3, preforming and bending the two ends of the bent pipe in the step A2 outwards to form a bent pipe in a shape of a Chinese character 'ji'; a4, cold press molding to obtain a rectangular frame; and A5, performing laser cutting on the rectangular frame to form an arc-shaped groove and a liquid leakage hole.
  5. 5. The process for manufacturing a cold-press formed integrated rear subframe according to claim 4, wherein in step A4, when cold-press forming is performed on the bent pipe in a figure-like shape, a tube blank of the bent pipe in a figure-like shape is first placed in a die cavity, pressurized gas is introduced into the tube blank, and the internal pressure is adjusted and the die is closed to realize in-die forming.
  6. 6. The process for manufacturing a cold-pressed integrated rear subframe according to claim 5, wherein in step A4, the method comprises the steps of: the method comprises the steps that T1, a sectional upper transverse part, a side bending part and an outer edge part of a corresponding U-shaped bent pipe are provided with a fixed supporting die and a movable supporting die, the fixed supporting die and the movable supporting die are used for keeping the forming positioning of a tube blank in the forming process during cold pressing, a first fixed supporting die is arranged in the middle of the upper transverse part, a first movable supporting die is arranged at the vertex angle of the upper transverse part and the vertex angle of the two side bending parts, a second fixed supporting die is arranged in the middle of the corresponding side bending part, one end, close to the side bending part, of the outer edge part is provided with a third fixed supporting die, a second movable supporting die is in sealing butt joint between the corresponding second fixed supporting die and the third fixed supporting die on the side bending part, a third movable supporting die is correspondingly arranged at the rest of the outer edge part, and a positioning label for laser scanning is arranged on the first fixed supporting die, the second fixed supporting die and the third fixed supporting die; T2, scanning all positioning labels by laser to serve as key positions of the rectangular frame, and fitting to generate a complete contour positioning coordinate group of the rectangular frame by combining the construction sizes of the rectangular frame in the fixed support die and the movable support die; T3, after the cold press mold is internally molded, opening a first movable supporting mold, a second movable supporting mold and a third movable supporting mold, and preparing for a welding process, wherein the first movable supporting mold corresponds to the mounting positions of the front suspension mounting bracket, the corresponding end sleeve, the sleeve fixing seat and the connecting rod mounting bracket, the second movable supporting mold corresponds to the mounting position of the lower cross beam, and the third movable supporting mold corresponds to the mounting positions of the rear beam, the suspension arm mounting bracket and the corresponding end sleeve and the cutting position of the arc groove; T4, scanning the exposed Chinese character 'ji' shaped frame by laser to obtain an actual contour positioning coordinate of the Chinese character 'ji' shaped frame, comparing the ideal contour positioning coordinate with the actual contour positioning coordinate, and determining whether the Chinese character 'ji' shaped frame is cold-pressed in place or not; and T5, performing welding operation at the position corresponding to the step T3, respectively scanning actual contour positioning coordinates of the rectangular frame at each welding stage, comparing the ideal contour positioning coordinates with the actual contour positioning coordinates, and determining whether the designed size is deformed or deviated outwards or not until a complete cold-pressed integrated rear auxiliary frame structure is formed.
  7. 7. The process for manufacturing a cold-formed integrated rear subframe of claim 6 wherein said third stationary support die is a ring-shaped support structure.
  8. 8. The process of claim 6, wherein the minimum length of each of the fixed support dies is L = L + [ pi ] R-S x D (D/t) ]/3, wherein S = 2 v, v is poisson' S ratio of the metal material used for the h-shaped frame, L is the total length of the h-shaped frame, R is the bending radius, D is the diameter of the circular tube, and t is the wall thickness of the circular tube.

Description

Cold-pressed integrated rear auxiliary frame and manufacturing process thereof Technical Field The invention relates to the technical field of integrated manufacturing of auxiliary frames of automobiles. More particularly, the present invention relates to a cold-formed integrated rear subframe and a process for manufacturing the same. Background The traditional automobile auxiliary frame is basically manufactured by splicing metal plates in a stamping and welding mode, and due to the consideration of chassis power arrangement, the traditional stamping and welding auxiliary frame is very difficult to arrange and is very limited in space, so that very high requirements are put forward on stamping part forming, and meanwhile due to the consideration of strength factors, the stamping and welding auxiliary frame is often matched with a welding reinforcing support and a reinforcing block, so that the design period and the production cost are increased, more dies, tools and clamps are required, a large amount of manpower and material resources are wasted, and meanwhile, the development trend of light-weight production of the whole automobile is not facilitated. In a specific structure, the auxiliary frame main body frame is formed by welding three inner high-pressure forming pipe beams and a straight pipe, during manufacturing, the clamp is adopted for positioning welding, the welding quantity is large, the thickness of the pipe beams is generally controlled to be 2-3mm, the integral deformation of the pipe beams can be caused by the welding thermal influence, the dimensional accuracy deviation is large, the risk of welding deformation exists, three sets of bent pipes and forming dies are required to be opened, the cost is high, the welding deformation is large, meanwhile, the joint surface of the joint of the pipe beams is poor, the welding difficulty is caused, the later welding seam is easy to crack, the gap is not large in a digital-analog view, but after the actual pipe beams are formed, the laser cutting of the irregular joint surface has a plurality of gaps, the actual connection is required to be subjected to joint filling connection by adopting a large number of welding seams, the joint risk is caused to the point with large actual stress, the joint surface of the inner high-pressure forming pipe beams is not necessarily completely attached to the digital-analog-digital joint, the joint gap is excessively large, and the joint stress area is small, and the joint strength of the whole frame is influenced. Disclosure of Invention It is an object of the present invention to solve at least the above problems and to provide at least the advantages to be described later. The invention also aims to provide a cold-pressed integrated rear auxiliary frame and a manufacturing process thereof, so as to solve the technical problems of complex manufacturing and transferring procedures and difficult guarantee of welding state of the rear auxiliary frame in the prior art. To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a cold-formed integrated rear subframe is provided, including a main body frame including a cross frame and a rear beam, the cross frame including an upper cross member, two side bends and outer edges respectively extending outside each side bend and having an arc shape, the rear beam being welded between opposite sides of the middle of the two outer edges, the main body frame being cold-formed by a round tube, the side bends being convexly curved toward an upper side of a plane in which the main body frame is located, the rear beam being a round straight tube, top corners of the upper cross member and each side bend transition being respectively welded with a front suspension mounting bracket, the two side bends being welded between the lower sides of the outer edges, the rear suspension mounting brackets being welded between the lower cross member and the rear beam, the side bends being welded with a connecting rod mounting bracket, the upper sides of the outer edges being welded with suspension arm mounting brackets, one end upper sides of the side bends being adjacent to the upper cross member, the outer edges being respectively welded with bushings, wherein the two bushing sides being disposed adjacent to the side bends are welded with the front suspension mounting brackets, respectively. Preferably, an arc-shaped groove matched with the sleeve is arranged on one side of the outer edge part, which is close to the bending center, and the arc-shaped groove is of a semicircular structure. On the other hand, the invention also provides a manufacturing process of the cold-press integrated rear auxiliary frame, which comprises the following steps of: s1, independently manufacturing a rectangular frame, a rear beam and two front suspension mounting brackets with required sizes; s2, welding the structure in the step S1