CN116020941A - Method for controlling rebound of lower section soft zone of B column - Google Patents

Method for controlling rebound of lower section soft zone of B column Download PDF

Info

Publication number
CN116020941A
CN116020941A CN202211455462.3A CN202211455462A CN116020941A CN 116020941 A CN116020941 A CN 116020941A CN 202211455462 A CN202211455462 A CN 202211455462A CN 116020941 A CN116020941 A CN 116020941A
Authority
CN
China
Prior art keywords
column
lower section
soft zone
rebound
hot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211455462.3A
Other languages
Chinese (zh)
Inventor
何建德
陈文�
王作孔
叶祖君
谭家爽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Liuzhou Baosteel Auto Parts Co ltd
Original Assignee
Liuzhou Baosteel Auto Parts Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Liuzhou Baosteel Auto Parts Co ltd filed Critical Liuzhou Baosteel Auto Parts Co ltd
Priority to CN202211455462.3A priority Critical patent/CN116020941A/en
Publication of CN116020941A publication Critical patent/CN116020941A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Body Structure For Vehicles (AREA)

Abstract

The invention discloses a method for controlling rebound of a soft zone at the lower section of a B column, wherein the B column is formed by welding a plurality of sections of materials and then hot-pressing, the tensile strength of the material at the upper section of the B column is larger than that of the material at the lower section of the B column, the lower section of the B column forms the soft zone, the rebound of the soft zone at the lower section of the B column is controlled by arranging rim charge at the edge of the B column, and a hot-pressing die is arranged at the hot-pressing position of the rim charge at the lower section of the B column to form a bent step by the rim charge. The invention can better control the rebound quantity of the soft zone and solve the problem of the dimensional accuracy of parts.

Description

Method for controlling rebound of lower section soft zone of B column
Technical Field
The invention relates to the technical field of automobile parts, in particular to a method for controlling rebound of a soft zone at the lower section of a B column.
Background
At present, with the continuous development of automobile industry technology, the requirements of automobile safety and light weight are also increasing. The B column is a main bearing structure of the side face of the automobile body, is connected with the top cover and the floor, plays an important role in supporting the whole passenger space and fixing the automobile door, is a main stress part in the side collision of the automobile, reasonably transmits the collision force to the whole automobile body through the B column, and ensures the enough safety space of the passenger cabin.
The strength is improved by adopting an ultra-high strength steel thermoforming process in the prior B column forming process, and the ultra-high strength steel thermoforming process can meet the strength requirement, but the part manufactured by the ultra-high strength steel thermoforming process is higher in strength, poorer in toughness, not provided with an energy absorption effect and cannot meet the five-star collision requirement. In order to meet the five-star collision standard of automobiles on the premise of light weight, a poor-strength butt welding thermoforming process is developed in recent years, namely, a B column is formed by hot-pressing after being butt welded by materials with different strengths, the lower section of the B column is made of materials with lower strength, the strength is smaller than that of the upper section, energy can be better absorbed, a soft region is formed, and the soft region formed by the butt welding thermoforming process is weak in strength and high in resilience, so that the requirement on the dimensional accuracy of parts cannot be met.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the rebound control method for the lower section soft zone of the B column can well control the rebound quantity of the soft zone and solve the problem of the dimensional accuracy of parts.
The technical scheme adopted by the invention is as follows: the method for controlling the rebound of the lower soft zone of the B column comprises the steps that the edge of the B column is provided with rim charge, and a hot-pressing die is arranged at the hot-pressing position of the rim charge at the lower section of the B column, so that the rim charge forms a bent step.
As the optimization of the technical scheme, the strength of the upper section material of the B column is 1300-1500MPa, and the strength of the lower section material is 550-750 MPa.
Compared with the prior art, the invention increases the forming drawing force, balances the drawing force of the end part of the B column, and simultaneously increases the steps in the forming process to ensure that the end part is uniformly attached to the die, and has uniform cooling and balanced internal stress. The invention solves the application of the material with low strength level on the B column, improves the collision performance of the part while realizing the light weight of the part, can well control the rebound quantity, and solves the problem of the dimensional accuracy of the part at the lower section of the B column.
Drawings
Fig. 1 is a schematic view of a blank of a B-pillar of the present invention.
FIG. 2 is a schematic diagram of a B-pillar finished product of the present invention.
Fig. 3 is a schematic diagram of the structure of the B-pillar and the mold of the present invention (before hot pressing).
Fig. 4 is a schematic diagram of a B-pillar and mold structure (after hot pressing) according to the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in figures 1-4, the invention provides a method for controlling rebound of a soft zone at the lower section of a B column, wherein the B column is formed by hot press molding after welding a plurality of sections of materials, the tensile strength of the upper section of the B column is greater than that of the lower section of the B column, the soft zone is formed at the lower section of the B column, the tensile strength of the upper section of the B column in the embodiment is 1300-1500MPa, and the tensile strength of the lower section of the B column is 550-750 MPa. The rebound control method of the lower section soft zone of the B column comprises the following steps: the edge of the B column is provided with rim charge with a certain width, and the hot pressing die is provided with a step for bending the rim charge at the hot pressing position of the rim charge at the lower section of the B column.
In the concrete implementation of the invention, the rim charge of the B column extends out of the B column by 200-500mm, the steps are arranged in the rim charge range of the side edge or (and) end part of the lower section of the B column, the steps on the lower die are concave steps relative to the hot-pressing surfaces of the upper die and the lower die, the steps on the upper die are convex steps, and when in hot pressing, the convex part of the upper die is pressed into the concave part of the lower die, so that the rim charge at the position is bent, namely, the two sides of the bent position are horizontal, and the bent position is vertical.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (2)

1. A method for controlling rebound of a lower section soft zone of a B column is characterized by comprising the following steps: the B column is formed by welding multiple sections of materials and then hot-pressing, the tensile strength of the upper section of the B column is greater than that of the lower section of the B column, a soft zone is formed at the lower section of the B column, and the rebound control method of the soft zone at the lower section of the B column is that the edge of the B column is provided with rim charge, and a hot-pressing die is arranged at the hot-pressing position of the rim charge at the lower section of the B column to enable the rim charge to form a bent step.
2. The B-pillar lower soft zone rebound control method of claim 1, wherein: the tensile strength of the upper section material of the B column is 1300-1500MPa, and the tensile strength of the lower section material is 550-750 MPa.
CN202211455462.3A 2022-11-21 2022-11-21 Method for controlling rebound of lower section soft zone of B column Pending CN116020941A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211455462.3A CN116020941A (en) 2022-11-21 2022-11-21 Method for controlling rebound of lower section soft zone of B column

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211455462.3A CN116020941A (en) 2022-11-21 2022-11-21 Method for controlling rebound of lower section soft zone of B column

Publications (1)

Publication Number Publication Date
CN116020941A true CN116020941A (en) 2023-04-28

Family

ID=86078479

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211455462.3A Pending CN116020941A (en) 2022-11-21 2022-11-21 Method for controlling rebound of lower section soft zone of B column

Country Status (1)

Country Link
CN (1) CN116020941A (en)

Similar Documents

Publication Publication Date Title
KR101863469B1 (en) Steel plate material, method for producing same and device for producing same, and method for producing press molded article using said steel plate material
JP5569661B2 (en) Manufacturing method and manufacturing apparatus of press-molded body
TWI510306B (en) Compression molding method and body parts
CN110446649B (en) Cap member and method for manufacturing same
JP5380890B2 (en) Press molding method and apparatus excellent in shape freezing property
JP6032374B2 (en) Method for producing press-molded body and press-molding apparatus
KR101472645B1 (en) Method for press-forming l-shaped components
KR101702795B1 (en) Production method for centre-pillar reinforcement
JP5728334B2 (en) Press-formed product for vehicle body having excellent collision performance and method for producing the same
KR102036062B1 (en) Press processing apparatus and press processing method
KR20170080681A (en) Manufacturing method and manufacturing device for press-molded article
JP2007326112A (en) Press forming method
CN104959442A (en) Production method of highly dimensionally accurate half shells
KR101579028B1 (en) Method for manufacturing closed-structure part and apparatus for the same
JP5137323B2 (en) Bumper reinforcing member manufacturing method
CN112077531A (en) Process method for manufacturing automobile parts through hot stamping forming
WO2018190320A1 (en) Press-molded article, structural member for automobiles that uses same, and production method for press-molded article
KR20180105212A (en) Panel-shaped molded articles, vehicle doors, and method of manufacturing panel-shaped molded articles
TWI642579B (en) Press-formed part for automobile body and manufacturing method thereof
JP6311853B1 (en) Hot stamp molded product, manufacturing method and manufacturing apparatus thereof
KR20170019758A (en) Ultra high-tensile steel panel and manufacturing method of the same
CN116020941A (en) Method for controlling rebound of lower section soft zone of B column
CN104554457A (en) B column on vehicle and manufacturing method
CN219360000U (en) High-efficient double-mold forming die for continuous carbon fiber reinforced thermoplastic composite material B column reinforcing plate
WO2021241025A1 (en) Press-forming mold and press-forming method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination