CN102168167A - Process for quenching automobile steel plate spring by using PAG (Polyalkylene Glycol) water-soluble medium - Google Patents
Process for quenching automobile steel plate spring by using PAG (Polyalkylene Glycol) water-soluble medium Download PDFInfo
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Abstract
The invention relates to a process for quenching an automobile steel plate spring by using a PAG (Polyalkylene Glycol) water-soluble medium. The quenching process is mainly adopted, wherein the PAG medium concentration is 8-10%, the high temperature range of a steel plate spring quenching furnace is 900-980 DEG C, the low temperature range of the steel plate spring quenching furnace is 800-600 DEG C, the temperature of the PAG medium is 40-42 DEG C, the swinging time of a workpiece in the medium is controlled at 14-20 s. By means of the process, the quenching degree of the thick steel plate spring in quenching is greatly improved, a greater hardening depth is obtained, the thermal stress and the organization stress of the steel plate spring become minimum, and the fatigue life of a product stand reaches more than 160,000 times. The process enlarges the specification range of the steel plate spring, has low cost and no harm and is safe and reliable.
Description
Technical field
The present invention relates to a kind of automobile leaf spring and utilize PAG water-soluble quenching medium heat-treating process, belong to the metal heat treatmet technical field.
Background technology
The medium of traditional automobile leaf spring quench treatment generally all is to adopt mechanical quenching oil, the relative cooling rate of machinery quenching oil medium is lower, hardening capacity for the thick above automobile leaf spring of 16mm is lower, therefore select for use the automobile leaf spring specification limit just very little, and mechanical quenching oil easily causes chemical organic chain break because of high temperature after thermal treatment utilization for some time, it is uneven that the chemical ingredients instability causes automobile leaf spring to quench, form quenching stress, cause being out of shape defectives such as big, quenching oil cooling rate to utilization is difficult for detecting simultaneously, causes fire and having a strong impact on environment easily; Utilize the PAG water-soluble quenching medium that automobile leaf spring is quenched in the also existing research of China, this polymkeric substance of PAG is at room temperature infinitely water-soluble, the Sauerstoffatom of its molecular chain and water electrode easily form hydrogen bonded, rising along with solution liquid temperature, the aggravation of water molecules thermal vibration, the bonding force of hydrogen bond weakens gradually, when reaching the temperature of certain value, its hydrogen bond will come off simultaneously, and original polymkeric substance soluble in water precipitation from solution is come out, and forms the small droplets that is suspended in the solution, make original solution become muddy, polymkeric substance presents insoluble phase, on the contrary solution can restore to the original state, form limpid uniform solution once more.This process makes reversible fully, also is its contrary molten point.So the aqueous solution of PAG polymkeric substance has reversibility, invade when thermometal and to quench in hardening liquid, integument round the rich PAG polymkeric substance of metal, controlled the radiating rate of metallic surface, reach the quenching crack of control plate spring and the distortion of stress and workpiece, because its quench cooling rate of PAG water-soluble quenching medium is between mechanical quenching oil and water, cooling rate is adjustable.Therefore the relative raising of hardening capacity and the quenching stress of quenching for heavy in section plate spring has certain control.PAG water-soluble quenching medium proportioning is simple; easy detection; the utilization scope is wide; can control the stress deformation of workpiece; same automobile leaf spring through hardening performance reach 50mm thick about; and use this technology can guarantee the long-term steady quality of plate spring thermal treatment; also safety nuisance free aspect environment protection; but when this technology is carried out quench treatment; concentration to the PAG water-soluble medium; the time of oscillation of workpiece in medium; the technical parameter of the important keys such as temperature of workpiece turnover quenching furnance is not done systematic research and test; after the quenching; cause the workpiece cracking; or under special detector, observe; have various tiny cracks, greatly reduce the qualification rate of product and the work-ing life of product, thereby this technology fails to obtain promotion and application widely always.
The content of invention
The present invention relates to a kind of automobile leaf spring and utilize PAG water-soluble quenching medium heat-treating process, main purpose is to solve thick specification automobile leaf spring to improve hardening capacity greatly when quenching, guaranteeing to quench obtains maximum penetration of hardness, makes workpiece thermal stresses and structural stress minimum simultaneously.
Technical solution of the present invention is: the good characteristic that utilizes the PAG quenchant, obtain the quenching effect of excellent properties, the degree that stirs of the concentration of control PAG water-soluble quenching medium, the turnover temperature of plate spring, the time of oscillation in medium, medium and the temperature of medium solution are crucial.By testing continuously, testing, determine adopting the PAG concentration of medium is that 8-10%, plate spring quenching furnance temperature (high temperature section is that 900 ℃-980 ℃, low-temperature zone are 800 ℃-600 ℃), PAG medium temperature are that 40 ℃-42 ℃, workpiece time of oscillation in medium are controlled at and were that best quenching technology, the general maximum cold speed control system scope that adopts were Vmax=200 ℃/s～150 ℃/s in 14 seconds-20 seconds; Cooling rate span of control in the time of 300 ℃ in 40 ℃/s～20 ℃/s, the plate spring quenching structure changes and is more satisfactory during the stress control state.
According to above-mentioned clear and definite characteristics, described concentration of medium is controlled between 8% to 10%, is higher than 10% o'clock thin up in span of control, is lower than at 8% o'clock and adds PAG stoste; Till its concentration that detects PAG concentration of medium employing sugar amount refractometer arrives and stablizes and in span of control, if the PAG water-soluble quenching liquid workpiece of density unevenness easily causes the depth of hardening zone inequality and forms bigger quenching stress after quenching.
Described medium temperature is controlled at 40 ℃～42 ℃, adopts cooling-cycle device to control, and the supporting installation of cooling tower, circulating line and pump and quenching tank is set; Open cooling system when temperature is too high, temperature is crossed the low general mode of heating that adopts and is heated up.
The time of oscillation of described plate spring in medium solution is 14 seconds-20 seconds.
Described plate spring quenching temperature, determining according to the specification of process furnace that soaking time is organized plate spring and entered in the medium after the complete austenitizing quenches, the high temperature section temperature is 900 ℃～980 ℃ quick cooling, the low-temperature zone temperature is 800 ℃～600 ℃ slow cooling, promptly guaranteed the penetration of hardness of plate spring, simultaneously the minimum of its thermal stresses, quenching stress and structural stress.
Embodiment
With automobile rear spring (assembly behind the EQ140) treatment production process is that example describes:
Heat treatment technics requires:
Plate spring material: 60Si2Mn
Plate spring specification: 16*75
Plate spring hardness: HRC40.5～47
Plate spring metallographic structure: 1-5 level tempering troostite
Other technologies will be asked for an interview to GB/T19844-2005 " plate spring " standard and drawing requirement.
The treatment production processing step is as follows:
One, configuration of PAG water-soluble quenching medium and supporting use
1. dispose the PAG water-soluble quenching medium, concentration is controlled at 8-10%.
2. agitation cycle system that is equipped with in the unlatching quenching tank and cooling system stir the PAG water-soluble quenching medium, stir about 15 minutes or longer time, different positions extracts the dielectric sample that configures respectively in quenching tank, detect the concentration of different positions sample with sugar amount refractometer, until different positions quenchant concentration unanimity, its objective is the consistence that guarantees concentration of medium.Open cooling system and guarantee that quench media temperature is controlled at 40-42 ℃
Two, workpiece is prepared and is detected
1. to starting material 60Si2Mn, the chemical ingredients and the mechanical property of 16*75 spring flat steel are tested.
2. the concentration with sugar amount refractometer mensuration quenchant is 9%, and quench media temperature is controlled at 41 ℃
Three, workpiece quenches and detects
1. setting the heating-furnace bore temperature is that 960 ± 10 ℃ of corresponding workpiece temperatures are 920 ℃, and workpiece is gone into medium quenching after the heat tracing time abundance.
2. metallographic examination 60Si2Mn, the 16*75 plate spring back metallographic structure state that quenches is a quenched martensite, and whole cross section quenched martensite content is greater than more than 95%.
3. adopt the hardness staircase method to detect quenching workpiece durometer level and penetration of hardness, beat some Rockwell hardnesss up to kernel of section from quenching workpiece cross section every 2mm, its result meets the requirements between HRC59-HRC61.
4. agitation cycle system, cooling system are all the time in opened condition in quenching process, and its purpose guarantees the homogeneity that plate spring quenches.
Four, workpiece tempering and detection
1. set plate spring tempering temperature and time, tempering temperature is at 700 ± 10 ℃.
2. with 60Si2Mn, the 16*75 plate spring is put into the tempering stove insulation immediately and was carried out tempering in 1 hour 30 minutes.
3. the hardness of tempered rear spring and metallographic structure are: hardness HRC43-45; Metallographic structure is three grades of tempering troostites.
Five, steel plate spring assembly detects
It is as follows to require that according to GB/T19844-2005 " plate spring " standard and drawing the every index of plate spring is detected its result:
Mechanical property: qualified fully through above-mentioned thermal treatment process processor performance.
The stand fatigue test: by drawing standard-required product stand fatigue lifetime is 160,000 times, far surpasses 80,000 salable product standards.
Other every indexs all meet national standard and product drawing requirement.
Claims (5)
1. a technology of utilizing PAG water-soluble medium quench treatment automobile leaf spring mainly is that to adopt the PAG concentration of medium be the quenching technology that 40 ℃-42 ℃, workpiece time of oscillation in medium were controlled at 14 seconds-20 seconds for 8-10%, plate spring quenching furnance temperature (high temperature section is that 900 ℃-980 ℃, low-temperature zone are 800 ℃-600 ℃), PAG medium temperature.
2. 1 described as requested, it is characterized in that concentration of medium is controlled between 8% to 10%, be higher than 10% o'clock thin up in span of control, be lower than at 8% o'clock and add PAG stoste.
3. 1 described as requested, it is characterized in that medium temperature is controlled at 40 ℃～42 ℃, adopt cooling-cycle device to control, the supporting installation of cooling tower, circulating line and pump and quenching tank is set; Open cooling system when temperature is too high, temperature is crossed the low general mode of heating that adopts and is heated up.
4. 1 described as requested, it is characterized in that the time of oscillation of plate spring in medium solution is 14 seconds-20 seconds.
5. 1 described as requested, it is characterized in that the plate spring quenching temperature, determine according to the specification of process furnace that soaking time is organized plate spring and entered in the medium after the complete austenitizing and quench that the high temperature section temperature is 900 ℃～980 ℃ quick cooling, the low-temperature zone temperature is 800 ℃～600 ℃ slow cooling.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105183022A (en) * | 2015-10-10 | 2015-12-23 | 十堰双齐科技有限公司 | Method for controlling PAG water base quenchant field concentration |
| CN112795763A (en) * | 2020-11-02 | 2021-05-14 | 江苏大力神链传动有限公司 | Method for improving depth of hardening layer on surface of inner hole of 40Cr large roller |
Citations (2)
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| CN101134994A (en) * | 2007-10-08 | 2008-03-05 | 长春轨道客车股份有限公司 | Spring steel quenching medium water-based hardening liquid heat treating process |
| CN101429591A (en) * | 2008-11-11 | 2009-05-13 | 长沙胜通汽配科技发展有限公司 | Thermal treatment process for spring steel PAG water-soluble quenching medium for band spring of automotive vehicle |
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2010
- 2010-02-26 CN CN2010101143095A patent/CN102168167A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101134994A (en) * | 2007-10-08 | 2008-03-05 | 长春轨道客车股份有限公司 | Spring steel quenching medium water-based hardening liquid heat treating process |
| CN101429591A (en) * | 2008-11-11 | 2009-05-13 | 长沙胜通汽配科技发展有限公司 | Thermal treatment process for spring steel PAG water-soluble quenching medium for band spring of automotive vehicle |
Non-Patent Citations (3)
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| 庞树钦等: "PAG水溶性淬火介质282A在钢板弹簧热处理生产中的应用效果", 《金属热处理》, no. 6, 30 June 1994 (1994-06-30), pages 30 - 32 * |
| 范海同等: "PAG淬火介质在铁道钢轨改制板弹簧热处理中的应用", 《金属热处理》, no. 2, 28 February 1993 (1993-02-28) * |
| 马鸣图: "PAG类淬火介质对弹簧钢性能的影响", 《汽车工艺与材料》, no. 2, 28 February 1995 (1995-02-28), pages 13 - 16 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105183022A (en) * | 2015-10-10 | 2015-12-23 | 十堰双齐科技有限公司 | Method for controlling PAG water base quenchant field concentration |
| CN112795763A (en) * | 2020-11-02 | 2021-05-14 | 江苏大力神链传动有限公司 | Method for improving depth of hardening layer on surface of inner hole of 40Cr large roller |
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