CN104805257A - Spiral spring quenching heat treatment process adopting water-soluble quenching medium - Google Patents
Spiral spring quenching heat treatment process adopting water-soluble quenching medium Download PDFInfo
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- CN104805257A CN104805257A CN201510230176.0A CN201510230176A CN104805257A CN 104805257 A CN104805257 A CN 104805257A CN 201510230176 A CN201510230176 A CN 201510230176A CN 104805257 A CN104805257 A CN 104805257A
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Abstract
The invention discloses a spiral spring quenching heat treatment process adopting a water-soluble quenching medium. The spiral spring quenching heat treatment process comprises the following steps of placing a spiral spring in a resistance furnace and heating to 850DEG C to 900DEG C and keeping the temperature for 30 minutes; then taking out the spiral spring and placing the spiral spring into a PAG (Poly Alkylene Glycol) water-soluble quenching medium for performing quenching treatment; uniformly stirring in the quenching process and enabling the temperature to reduce to room temperature; taking out the spiral spring and placing the spiral spring into an isothermal furnace with the temperature of 440 to 480DEG C and keeping the isothermal state for 1.5 hours; finally, taking out the spiral spring and performing oil cooling to room temperature. According to the spiral spring quenching heat treatment process disclosed by the invention, by using the characteristic that the cooling speed of the PAG water-soluble quenching medium is higher, residual austenitic is reduced, the substructure of a martensitic structure is refined, the separation of carbide along the crystal boundary and the boundary of martensite lath is avoided, and the spiral spring obtains comprehensive mechanical properties superior to those obtained by a traditional oil quenching heat treatment process.
Description
Technical field
The present invention relates to the thermal treatment process that a kind of whisker quenches in water-soluble quenching medium, belong to spring steel technical field of heat treatment.
Background technology
60Si2CrVAT spring steel is as the special material of current China speed-increase train bogie whisker, and the improvement of its mechanical property is the emphasis of research always.This spring steel thermal treatment process normally adopts oil quenching-average tempering; in actual production process; adopt mechanical quenching oil as quenchant; because its cooling power is lower; spring usually can be made to occur " quenching not saturating ", and hardness is lower, the phenomenon of undercapacity; and often along with burning and a large amount of oil smoke of emerging, the problem of potential safety hazard and contaminate environment can be there is in its use procedure.
PAG water-soluble quenching medium develops the novel quenchant of a class faster at present, it has good hardening capacity and hardenability, and there is safety, clean, the advantage of environmental protection, in addition, the speed of cooling of PAG quenchant is between water and mechanical quenching oil, and its speed of cooling can be regulated by changing its concentration, the stress produced control again quenching while improving through hardening ability after, " shrend is ftractureed to make it overcome, oil quenching is not hard " shortcoming, therefore, PAG quenchant is also more and more general to be applied in the thermal treatment process that many important spare parts produce, particularly be applicable to general carbon steel, middle-low alloy steel etc.
The application of PAG quenchant in spring steel also has relevant report, as provided a kind of technique utilizing PAG water-soluble medium quench treatment automobile leaf spring in CN102168167A, this technique can improve hardening capacity and the fatigue lifetime of automobile leaf spring, but not mentioned to the influence research of the mechanical properties such as whisker intensity, plasticity and safe range of stress about PAG quenchant, also rarely have report in other relevant document.
Summary of the invention
The object of this invention is to provide a kind of whisker quenching heat treatment technique adopting water-soluble quenching medium, overcome the hardening capacity that in traditional oil quenching tempering process, oil quenching causes low, the shortcoming that hardness, intensity, plasticity and fatigue property are poor, avoids in oil quenching process simultaneously and occurs
Oil firing, emit the safety such as oil smoke and atmosphere polluting problem.
Technical scheme of the present invention is as follows:
The present invention is a kind of whisker quenching heat treatment technique adopting water-soluble quenching medium, it whisker is put into resistance furnace to be heated to 850 DEG C ~ 900 DEG C, soaking time is 30 minutes, then take out and put into PAG water-soluble quenching medium and carry out quench treatment, uniform stirring is carried out in quenching process, make its temperature be down to room temperature, then after being taken out, put into the constant-temperature oven isothermal 1.5h that temperature is 440 DEG C ~ 480 DEG C, finally taking-up with oil cooling to room temperature.The present invention utilizes PAG water-soluble quenching medium cooling rate feature faster, reduce paralympic, the refinement substructure of martensitic stucture, avoids the precipitation of carbide along crystal boundary and martensite lath border, makes this whisker obtain the comprehensive mechanical property better than traditional oil quenching thermal treatment process.
Further, described PAG water-soluble quenching medium concentration is 10% ~ 15%.If PAG concentration is too low, cooling rate is accelerated, and can increase quenching stress, the probability of whisker hardening crack also can strengthen; If PAG concentration is excessive, cooling rate reduces, and helical spring hardening capacity, hardenability decline, and the degree of refinement of martensite substructure also can reduce.PAG quenchant in this concentration range, had both overcome the risk ftractureed after whisker is quenched, and had obtained again more tiny martensite lath, make its mechanical property reach the best.When PAG water-soluble quenching medium concentration exceeds the concentration range of 10% ~ 15% in use procedure, coordinate the use of refractometer, add new PAG solution or add water carry out diluting to reach 12% ~ 13% PAG concentration range.PAG water-soluble quenching medium in use wants uniform stirring, and medium temperature controls within the scope of 15 DEG C ~ 25 DEG C.
The present invention's whisker steel used is 60Si2CrVAT, and its composition is C:0.56% ~ 0.64%, Si:1.4% ~ 1.8%, Cr:0.9% ~ 1.2%, V:0.1% ~ 0.2%, Mn:0.4% ~ 0.7%, P≤0.03%, S≤0.03%.
Technique effect of the present invention is: the present invention is by adopting certain density PAG as quenchant in 60Si2CrVAT whisker thermal treatment process, avoid the risk easily occurring cracking after causing this whisker to quench because cooling rate is too fast on the one hand, make use of again PAG water-soluble quenching medium cooling rate feature faster on the other hand, improve the speed of cooling of 60Si2CrVAT whisker in quenching process, thus minimizing residual austenite content, improve martensitic transformation amount, refinement martensite substructure, avoid the precipitation of carbide along crystal boundary and martensite lath border, this whisker is finally made to obtain than intensity better after traditional oils Q-tempering and plasticity, also improve safe range of stress significantly simultaneously.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment 1:
60Si2CrVAT spring steel is put into resistance furnace and is heated to 870 DEG C, soaking time is 30 minutes, then taken out, put into 5%PAG, 10%PAG, 13%PAG, 15%PAG, 20%PAG respectively and mechanical quenching oil carries out quench treatment, the temperature of quenchant is room temperature, and quenching process medium wants uniform stirring, then tempering 1.5h in the constant-temperature oven of 440 DEG C, finally adopts oil cooling to room temperature.
The performance test results after thermal treatment is as shown in the table:
Data as can be seen from table, adopt the quenching of PAG quenchant more can improve the hardness of spring steel, intensity and plasticity than traditional quenching oil quenching; In addition, after above-mentioned concentration PAG quenching, in this spring steel, do not occur quenching crack, the concentration range that the best determining PAG water-soluble quenching medium by test of many times uses is 10% ~ 15%.
Embodiment 2: adopt the thermal treatment process in embodiment one, quenchant changes 13%PAG and quenching oil into, spring steel after thermal treatment is processed into fatigue criterion sample respectively, then on protracted test machine, fatigue test is carried out, the safe range of stress σ-1 recorded after adopting the quenching of 13%PAG quenchant is 781.5MPa, and the safe range of stress σ-1 after traditional oil quenching is only 713.9MPa, show to adopt 13%PAG to replace traditional oil quenching can improve the fatigue property of this spring steel as quenchant.
Certainly, more than just embody rule example of the present invention, the technical scheme that the present invention also has other embodiment, all employings to be equal to replacement or equivalent transformation to be formed, all drops within protection domain of the presently claimed invention.
Claims (4)
1. one kind adopts the whisker quenching heat treatment technique of water-soluble quenching medium, it is characterized in that: whisker is put into resistance furnace and be heated to 850 DEG C ~ 900 DEG C, soaking time is 30 minutes, then take out and put into PAG water-soluble quenching medium and carry out quench treatment, uniform stirring is carried out in quenching process, make its temperature be down to room temperature, then after being taken out, put into the constant-temperature oven isothermal 1.5h that temperature is 440 DEG C ~ 480 DEG C, finally taking-up with oil cooling to room temperature.
2. the whisker quenching heat treatment technique of employing water-soluble quenching medium according to claim 1, is characterized in that: described PAG water-soluble quenching medium concentration is 10% ~ 15%.
3. the whisker quenching heat treatment technique of employing water-soluble quenching medium according to claim 2, it is characterized in that: when in use procedure, PAG water-soluble quenching medium concentration exceeds the concentration range of 12% ~ 13%, coordinate the use of refractometer, add new PAG solution or add water carry out diluting to reach 10% ~ 15% PAG concentration range.
4. the whisker quenching heat treatment technique of employing water-soluble quenching medium according to claim 1, is characterized in that: PAG water-soluble quenching medium in use wants uniform stirring, and medium temperature controls within the scope of 15 DEG C ~ 25 DEG C.
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| CN201510230176.0A CN104805257A (en) | 2015-05-08 | 2015-05-08 | Spiral spring quenching heat treatment process adopting water-soluble quenching medium |
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| CN201510230176.0A CN104805257A (en) | 2015-05-08 | 2015-05-08 | Spiral spring quenching heat treatment process adopting water-soluble quenching medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108118135A (en) * | 2017-12-19 | 2018-06-05 | 内蒙古北方重工业集团有限公司 | Prevent the method being deformed when spring quenches |
| CN114737039A (en) * | 2022-03-28 | 2022-07-12 | 嘉兴恒瑞金属科技股份有限公司 | Heat treatment process for reducing hardness difference of wind power bolt |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09170030A (en) * | 1995-12-19 | 1997-06-30 | Sumitomo Electric Ind Ltd | Spring steel wire and its production |
| 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 |
-
2015
- 2015-05-08 CN CN201510230176.0A patent/CN104805257A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09170030A (en) * | 1995-12-19 | 1997-06-30 | Sumitomo Electric Ind Ltd | Spring steel wire and its production |
| 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 (1)
| Title |
|---|
| 中国机械工程学会热处理学会编: "《热处理手册 第3卷 热处理设备和工辅材料》", 31 January 2008, 机械工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108118135A (en) * | 2017-12-19 | 2018-06-05 | 内蒙古北方重工业集团有限公司 | Prevent the method being deformed when spring quenches |
| CN114737039A (en) * | 2022-03-28 | 2022-07-12 | 嘉兴恒瑞金属科技股份有限公司 | Heat treatment process for reducing hardness difference of wind power bolt |
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Application publication date: 20150729 |