CN109735690A

CN109735690A - Stabiliser bar segmentally heating forms quenching technical

Info

Publication number: CN109735690A
Application number: CN201811580143.9A
Authority: CN
Inventors: 王立春; 刘风来; 万忠涛
Original assignee: TIANJIN CITY DAGANG AUTOMOBILE FITTING SPRING FACTORY
Current assignee: TIANJIN CITY DAGANG AUTOMOBILE FITTING SPRING FACTORY
Priority date: 2018-12-24
Filing date: 2018-12-24
Publication date: 2019-05-10

Abstract

The invention belongs to stabiliser bar manufacturing technology fields, quenching technical is formed more particularly, to a kind of stabiliser bar segmentally heating, it is by the whole heating method of the product that stabiliser bar segmentally heating, which forms quenching technology, become segmentally heating mode, it is heated just for stress concentrated position and bending part, can not only influence the thermoforming of product in this way, but also product standard requirement can be met with the metallographic structure of proof stress concentrated position, to the position of not emphasis, then the original materials behavior of product is kept.By the stabiliser bar that this method manufactures, the finished product structural state of bending part and stress concentration portion position is secondary troostite+sorbite, and remaining position is still ferrite state.

Description

Stabiliser bar segmentally heating forms quenching technical

Technical field

The invention belongs to stabiliser bar manufacturing technology fields, form quencher more particularly, to a kind of stabiliser bar segmentally heating Skill.

Background technique

Automobile stabilizer bar, also referred to as stabilizer bar are the important components in automobile chassis suspension system, play maintenance Vehicle balance prevents from rolling, and adjusting is appropriate effect.Raw material selected by the components are solid or hollow bar bullets Spring steel, main machining method are 1. fractures, and -- -- -- -- 7. throw for 5. tempering -- 6. correction -- for 4. quenchings for 3. moldings for 2. whole heating Ball -- 8. coating -- 9. is packed；Both at home and abroad in the same industry, generally to solid bar stabiliser bar product using first whole heating, then With the one-time formed method of Special forming machine, quenched after molding using the residual temperature of product itself, hardening media is generally water Or machine oil.As a heat-treatment part, important process are as follows: heating-quenching-tempering；When being heated to 850 DEG C of temperatures above When, the tissue morphology that product is put into hardening media to (oil or water) stabiliser bar product changes, i.e., from ferrite to time Fiery troostite+sorbite transformation.The toughness and intensity of material are improved, and can resist the torsional shear under stronger alternating load Stress, to improve the fatigue endurance service life.

It is often fixed unique at maximum stress concentration but when twisting in vehicle, original heat treatment Technique is carried out to entire rod piece, therefore for not answering very much the part of force request in the premise for guaranteeing original performance requirement greatly Under, segmentation difference is heat-treated, it is possible to reduce heat treatment process processing cost.

Summary of the invention

The present invention proposes a kind of assembled steel that corner post is removable for the problems in above-mentioned background technique of effective solution Structural construction composite module, specific technical solution are as follows；

A kind of stabiliser bar segmentally heating molding quenching technical, which is characterized in that be 55Cr3 to material, tensile strength exists The bar of segmentation is carried out descale vehicle pin, then used by the solid or hollow Cutting stick between 1400~1600 megapascal Heating equipment is contacted, the disconnected position of the straight line heated by two end in contact electrodes to needs is heated, and heating part is divided into two Section, every segment length general 150 to 200mm, heating time 30S, heating temperature are 900 DEG C ± 30 DEG C, then will be after heating Product is put into stabilizer bar forming machine, carries out bending after positioning, is quenched after bending using residual temperature, product hardening heat be >= 780 DEG C, the cool time is 30 minutes, and product is put into tempering furnace after taking-up, using 530 DEG C of ± 10 DEG C of tempering, is added in segmentation Hot spot obtains secondary troostite tissue, and other positions are then tempered sorbite tissues；

Compared with prior art, the invention has the advantage that: stabiliser bar segmentally heating molding quenching technology be should The whole heating method of product, becomes segmentally heating mode, is heated just for stress concentrated position and bending part, so both The thermoforming of product can not be influenced, and product standard requirement can be met with the metallographic structure of proof stress concentrated position, to not The position of emphasis then keeps the original materials behavior of product.By the stabiliser bar that this method manufactures, bending part and stress collection The finished product structural state at middle position is secondary troostite+sorbite, and remaining position is still ferrite state.It is tried by rack It is verified after testing, product can still keep higher fatigue life without being broken, but energy cost can reduce by 40% or more； The technique is had an advantage that in summary: 1. are heated just for stress concentration portion position and bending part, prominent stabiliser bar point The energy saving of section hot briquetting quenching technology；2. can protrude in the single integral product of stabiliser bar, there are two different tissue shapes State, i.e. ferrite and secondary troostite+sorbite subregion exist；3 stabiliser bar segmentally heating molding machine quenching technologies are to stabilization The fatigue life of bar does not influence, and fatigue life meets 200,000 requirements.

Detailed description of the invention

Fig. 1 is the stabiliser bar finished product structure schematic diagram after stage-hardening of the present invention；

1 is segmentally heating processing region (secondary troostite+sorbite)

Specific embodiment

In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawing with embodiment to this Invention is described in further detail；

Specific embodiment 1, the selection of material 55Cr3, tensile strength are solid or hollow between 1400~1600 megapascal Bar is cut off, and it is to be not required to when appearing on the scene using this raw material of 55Cr3 that general material, which is between 1300~1400, Carry out normalizing process；

Then the bar of segmentation is subjected to descale vehicle pin, then using contact heating equipment, passes through two end in contact electricity Extremely the disconnected position of straight line that needs heat is heated, heating part is divided into two sections, and every segment length general 150 to 200mm adds The hot time is 30S, and heating temperature is 900 DEG C ± 30 DEG C, and the product after heating is then put into stabilizer bar forming machine, is positioned laggard Row bending, is quenched after bending using residual temperature, and product hardening heat is >=780 DEG C, and the cool time is 30 minutes, will after taking-up Product is put into tempering furnace, using 530 DEG C of ± 10 DEG C of tempering, in segmentally heating position acquisition secondary troostite tissue, and other Position is then tempered sorbite tissue.Product is corrected after tempering, then carries out Shot Blasting, ball blast intensity is 0.3- 0.6A。

The characteristics of technique, is:

1. the energy saving of prominent stabiliser bar segmentally heating molding quenching technology, i.e., just for stress concentration portion position and bending part Position is heated, and energy consumption reduces by 40% or more；

2. in the prominent single integral product of stabiliser bar, there are two different structural states, i.e. ferrite and secondary troostite + sorbite subregion exists.

3. stabiliser bar segmentally heating molding machine quenching technology does not influence the fatigue life of stabiliser bar, fatigue life meets 200000 requirements.

The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered It is considered as the protection scope of invention.

Claims

1. a kind of stabiliser bar segmentally heating forms quenching technical, which is characterized in that be 55Cr3 to material, tensile strength is 1400 The bar of segmentation is carried out descale vehicle pin, then using contact by the solid or hollow Cutting stick between~1600 megapascal Heating equipment, the disconnected position of the straight line heated by two end in contact electrodes to needs are heated, and heating part is divided into two sections, often Segment length general 150 to 200mm, heating time 30S, heating temperature are 900 DEG C ± 30 DEG C, then put the product after heating Enter stabilizer bar forming machine, carry out bending after positioning, quenched after bending using residual temperature, product hardening heat is >=780 DEG C, is quenched The fiery time is 30 minutes, and product is put into tempering furnace after taking-up, using 530 DEG C of ± 10 DEG C of tempering, is obtained at segmentally heating position Secondary troostite tissue is obtained, and other positions are then tempered sorbite tissues.