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Manufacturing method of vehicle frame longitudinal beam and vehicle frame longitudinal beam manufactured by same

A manufacturing method and technology of longitudinal beams, applied in the field of longitudinal beams, can solve the problems of low strength of longitudinal beams, increased processing difficulty, complicated production procedures, etc., and achieve the effect of improving strength and preventing tissue growth

Active Publication Date: 2011-11-23
DONGFENG MOTOR CORP HUBEI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and problems existing in the prior art that the strength of the longitudinal beam is less, the difficulty of processing is increased, and the production process is complicated, and a method of increasing the strength of the longitudinal beam is provided, which reduces the difficulty of processing and simplifies the production process. Method for manufacturing vehicle frame longitudinal beam in production process and vehicle frame longitudinal beam obtained therefrom

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: The frame used is: DFLK62T0 frame, single-layer longitudinal beam structure:

[0032] A method for manufacturing a vehicle frame longitudinal beam, comprising the following steps in sequence:

[0033] Material preparation steps: first uncoil the rolled girder plate material, and then longitudinally cut the girder plate to obtain the longitudinal beam blank;

[0034] Longeron forming step: forming and processing the above-mentioned longitudinal beam blank to obtain the formed longitudinal beam, this step includes channel beam forming operation and edge trimming operation;

[0035] Hole processing step: performing a hole processing operation on the above-mentioned formed stringer to obtain a formed stringer with holes;

[0036] Induction heat treatment strengthening step: first conduct induction heating on the above-mentioned formed longitudinal beam with holes, the frequency of induction heating is 20kHz, the heating rate is ≥20°C / s, and when it is heated ...

Embodiment 2

[0041] The content is the same as above, the difference is: the frequency of induction heating is 25kHz, the heating rate is ≥20°C / sec, and when heated to 1000°C, the dwell time is ≤30 seconds.

[0042] The volume ratio of undissolved ferrite and low carbon martensite in the finished longitudinal beam is 20%:80%, the tensile strength of the finished longitudinal beam is 1200MPa, and the yield strength is 1100MPa.

[0043] Frame lightweight effect: Compared with the double-layer beam structure frame using high-strength plate material, the dead weight is reduced by 143 kg.

Embodiment 3

[0045] The content is the same as above, the difference is: the frequency of induction heating is 23kHz, the heating rate is ≥20°C / s, and when it is heated to 988°C, it stays, and the dwelling time is ≤30 seconds.

[0046] The volume ratio of undissolved ferrite and low carbon martensite in the finished longitudinal beam is 25%:75%, the tensile strength of the finished longitudinal beam is 1175MPa, and the yield strength is 1075MPa.

[0047] Lightweight effect of the frame: Compared with the double-layer beam structure frame using high-strength plate material, the dead weight is reduced by 141 kg.

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Abstract

The invention discloses a manufacturing method of a vehicle frame longitudinal beam, and the method comprises a material preparation step, a longitudinal beam forming step, a perforation step, an induction heat treatment reinforcement step and subsequent steps. In the induction heat treatment reinforcement step, the strength of the longitudinal beam is increased by means of scan-type continuous heating and scan-type continuous water spray cooling. The vehicle frame longitudinal beam manufactured by the method is a dual-phase steel material which contains (by volume) 20-30% of non-molten ferrite and 70-80% of low-carbon martensite, and the tensile strength of the vehicle frame longitudinal beam is 1100 to 1300 MPa and the yield strength of the vehicle frame longitudinal beam is 1000 to 1200 MPa. By utilizing the design disclosed by the invention, the strength of the longitudinal beam is greatly increased and the production process is simplified; and besides, the production cost is reduced and the application range is enlarged.

Description

technical field [0001] The invention relates to a manufacturing process of a longitudinal beam, in particular to a method for manufacturing a longitudinal beam of a vehicle frame and a manufactured vehicle frame, and is particularly suitable for the manufacture of a longitudinal beam used in a single-layer longitudinal beam structure vehicle frame. Background technique [0002] At present, in order to further increase the carrying capacity of vehicles and reduce the weight of vehicles in the automobile manufacturing industry, high-strength steel plates are mainly used in the manufacture of vehicle frames, which are produced by steel factories through composition design, smelting and rolling control. The high-strength steel plate is directly used by the automobile longitudinal beam production plant to manufacture the vehicle frame. However, due to the limited strength of this kind of high-strength steel plate, the load-bearing capacity of the single-layer longitudinal beam fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C21D1/42B62D21/02
CPCY02P10/25
Inventor 赵俊平褚东宁李少华章新泽
Owner DONGFENG MOTOR CORP HUBEI
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