CN106854686B - A kind of shaping methods of ultrahigh-strength steel thin-wall shell quenching distortion - Google Patents
A kind of shaping methods of ultrahigh-strength steel thin-wall shell quenching distortion Download PDFInfo
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- CN106854686B CN106854686B CN201510892600.8A CN201510892600A CN106854686B CN 106854686 B CN106854686 B CN 106854686B CN 201510892600 A CN201510892600 A CN 201510892600A CN 106854686 B CN106854686 B CN 106854686B
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Abstract
The invention discloses a kind of shaping methods of ultrahigh-strength steel thin-wall shell quenching distortion, and its step are as follows: after shell quenching, shell length direction being divided into N sections, N+1 is waited partial cross-sections (two ends are essential)；Utilize the ovality of each equal part cross section upper housing of miking, the overproof section of mark ellipse degree, the long axis of mark ellipse, minor axis location；When shaping, maximum cross-section is being deformed by method installation shaping tooling first；The ovality in other sections is successively measured, and shaping tooling is successively installed at overproof section；Step 5: after repetition measurement shaping each cross-section ovality, guarantee consistent after each ellipticity and shaping；Shaping tooling is tempered together with tooling after the installation is completed, by shell；Shaping tooling is removed after tempering, measures each ellipticity；If each ellipticity terminates shaping within the scope of design objective, if still there is ellipticity overproof, secondary reshaping is carried out according to the method described above.
Description
Technical field
The present invention relates to Field of Heat-treatment, and in particular to a kind of shaping side of ultrahigh-strength steel thin-wall shell quenching distortion
Method.
Background technique
Ultra high strength alloy steel can be used for making burning chamber shell, and 30Cr3SiNiMoVA is in ultra high strength alloy steel
Typical a kind of, alloying element content is respectively as follows: C:0.28~0.34, Cr:2.80~3.20, Ni:0.80~1.20, Mn:
0.50~0.80, Si:0.90~1.20, Mo:0.60~0.80, V:0.05~0.15, P :≤0.02, S :≤0.02.The material
The mode that material relies primarily on quenching+tempering obtains intensity and toughness.
Quenching process must be heated to austenitizing temperature or more, then be rapidly cooled, make its obtain it is high-intensitive and
The lath martensite tissue of hardness.In quenching process as expanding with heat and contract with cold, caused by structural transformation thermal stress, structural stress, preceding
Procedure machining stress is overlapped mutually, and reaches the yield limit of metal, and part is plastically deformed；Hereafter, stress
Accumulation and release process alternately, so that part is bent and the deformation such as warpage.Meanwhile it expanding with heat and contract with cold and phase transformation
Under the action of uneven caused thermal stress and structural stress, part makes it may also happen that volume change (increasing or reducing)
The size of part changes.Especially in asymmetry small bore part (such as mandrel, transmission shaft and rod like parts), surface area it is big and
In the heat treatment process of the thin part of thickness (such as sleeve, disk class and blade), part deformation is the key that class in part manufacturing
Topic.
Due to its design feature, quenched distortion is even more serious, leads to following process, dress for big L/D ratio, thin-wall case
The common problem for leading to increase product development cycle, reduce qualification rate is had become with the problems such as difficulty.
Summary of the invention
In order to solve the above technical problems, the invention proposes a kind of shaping sides of ultrahigh-strength steel thin-wall shell quenching distortion
Method,
Easy to operate, effect is obvious.According to unimach material characteristic, the deformation rule of thin-wall case, outer hoop is designed
Formula special tooling determines general anti-deformation using the elastic-plastic deformation rule of such part；At unimach heat
Manage operational characteristic, when tempering, reaches shaping effect, and when discharging mechanical shaping shape generation stress, shell is effectively guaranteed
Dimensional stability
The specific steps of which are as follows:
Step 1: shell length direction is divided into N sections, N+1 is waited partial cross-sections after shell quenching (two ends are essential)；
Step 2: using the ovality of each equal part cross section upper housing of miking, the overproof section of mark ellipse degree,
The long axis of mark ellipse, minor axis location；
Step 3: deforming maximum cross-section by method installation Special shaping tooling first when shaping；
Step 4: successively measuring the ovality in other sections, and shaping tooling is successively installed at overproof section；Step
Five, after repetition measurement shaping each cross-section ovality, it is consistent after each ellipticity and shaping；Step 6: shaping tooling is pacified
After dress, shell is tempered together with tooling；
Step 7: removing shaping tooling after tempering, each ellipticity is measured；
Step 8: if each ellipticity terminates shaping within the scope of design objective, if still there is ellipticity super
Difference then carries out secondary reshaping according to the method described above；
Further, the unimach material trade mark that the shell uses is 30Cr3SiNiMoVA.
Further, the quantity shell length and structure determination of shell equal segments described in step 1, principle are when equal part is horizontal
Section must not be located at wall thickness change intersection, at non-straight line segment, at chamfering, exterior part lap-joint, generally no less than 3 equal parts
Cross section.
Further, shaping tooling described in step 3 is over-sleeved, and 1 set/2 is secondary.The shaping tooling installs principle are as follows:
Using the partial cross-sections reversible deformation such as over-sleeved Special shaping tooling makes, the A point of 1 set/2 secondary shaping toolings is placed at transverse, B
Point is placed at short axle, and using the biggish axis of deflection as measuring basis, reversible deformation numerical value is the 50% ~ 60% of original measurement numerical value, not
Size at this is pushed as diameter -1.0mm ~ 1.2mm after installation having a size of diameter+2mm at long axis before installation shaping tooling.
Further, under the premise of guaranteeing shell mechanical performance, temperature should increase 20 ± 10 DEG C when secondary reshaping is tempered.
The present invention has the advantages that according to the heat treatment process of 30Cr3SiNiMoVA ultrahigh-strength steel thin-wall shell and quenching
Deformation rule after fire has designed and manufactured for such material, the over-sleeved Special shaping tooling of structure, shaping methods, skill
Art principle is simple, easy to operate, qualification rate is high；It is tempered common progress after this method and quenching, without additional trimming, and is returning
The residual stress that mechanical shaping is eliminated at fiery temperature guarantees the dimensional stability of shell.
Detailed description of the invention
Fig. 1 is the shaping methods flow chart of ultrahigh-strength steel thin-wall shell quenching distortion；
Fig. 2 is that the partial cross-sections such as ultrahigh-strength steel thin-wall shell divide figure；
Fig. 3 is the shaping tooling design drawing of ultrahigh-strength steel thin-wall shell quenching distortion.
Specific embodiment
The present invention is to solve the problems, such as 30Cr3SiNiMoVA ultrahigh-strength steel thin-wall shell quenching distortion, by designing outer paddy
Formula special tooling, the elastic-plastic deformation rule after being quenched according to shell under deformation data, such material specific temperature, calculates room temperature
Under should make shell deformation preventing amount, and stablize shell ovality within the scope of design objective.The present invention passes through
Following steps are realized:
It gives an actual example below
Implement on 30Cr3SiNiMoVA thin-wall case, its diameter of the shell is about 300 ㎜, and length is 2780 ㎜, wall thickness
For 1.6 ㎜.Design objective is shell circularity≤2 ㎜ (ovality≤4 ㎜).The specific method is as follows:
Step 1: shell length direction is divided into three sections, four are waited partial cross-sections, and section must not be located at after shell quenching
At the non-straight line segment in both ends, as shown in Figure 2；
Step 2: using the ovality of each equal part cross section upper housing of miking, the overproof section of mark ellipse degree
1,2,4 section, the long axis of mark ellipse, minor axis location；Specific data are shown in Table 1:
1 30Cr3SiNiMoVA thin-wall case quenching distortion data of table
| Section | Section 1 | Section 2 | Section 3 | Section 4 |
| Long axis (㎜) | 300 ﹢ 4.75 | 300 ﹢ 3.27 | 300 ﹢ 1.96 | 300 ﹢ 4.93 |
| Short axle (㎜) | 300 ﹣ 2.48 | 300 ﹣ 2.26 | 300 ﹣ 1.87 | 300 ﹣ 1.98 |
| Ovality (㎜) | 7.23 | 5.53 | 3.83 | 6.91 |
Step 3: deforming at maximum section 1 by method installation Special shaping tooling first, that is, when shaping by tooling
At A point corresponding housing long axis, anti-deformation is respectively (section 1) long axis 300-2.8 ㎜, short axle 300+1.3 ㎜；
Step 4: successively measuring the ovality in other sections, 3 data of section are long axis 300+1.63 ㎜, short axle 300-
1.56 ㎜, it is not overproof.Section 2,4 data with quenching after it is unchanged, it is still overproof, respectively section 2, section 4 install shaping work
Dress.Contravariant graphic data is (section 2) long axis 300-1.9 ㎜, short axle 300+1.3 ㎜, (section 4) long axis 300-2.9 ㎜, short axle
300+1.1㎜；
Step 5: after repetition measurement shaping each cross-section ovality, consistent after each ellipticity and shaping, data are shown in
Table 2；
2 30Cr3SiNiMoVA thin-wall case contravariant graphic data of table
| Section | Section 1 | Section 2 | Section 3 | Section 4 |
| Long axis (㎜) | 300 ﹣ 2.8 | 300 ﹣ 1.9 | 300 ﹢ 1.63 | 300 ﹣ 2.9 |
| Short axle (㎜) | 300 ﹢ 1.3 | 300 ﹢ 1.3 | 300 ﹣ 1.56 | 300 ﹢ 1.1 |
Step 6: shaping tooling is after the installation is completed, shell is tempered together with tooling；
Step 7: removing shaping tooling after tempering, each ellipticity, the oval degree of each equal part cross section are measured
According to being shown in Table 2；
Data after 3 30Cr3SiNiMoVA thin-wall case shaping of table
| Section | Section 1 | Section 2 | Section 3 | Section 4 |
| Long axis (㎜) | 300 ﹢ 0.91 | 300 ﹢ 0.69 | 300 ﹢ 1.63 | 300 ﹢ 1.01 |
| Short axle (㎜) | 300 ﹣ 0.6 | 300 ﹣ 0.48 | 300 ﹣ 1.56 | 300 ﹣ 0.44 |
| Ovality (㎜) | 1.51 | 1.17 | 3.19 | 1.45 |
Step 8: each ellipticity is all satisfied the design objective of≤4 ㎜, terminate shaping.
Complete the shaping of the heat-treatment distortion of the shell.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.
Claims (3)
1. a kind of shaping methods of ultrahigh-strength steel thin-wall shell quenching distortion, which comprises the following steps:
Step 1: shell length direction is divided into N sections, N+1 is waited partial cross-sections, and two ends are essential after shell quenching；
The quantity shell length and structure determination of shell equal segments, principle are had a common boundary when equal part cross section must not be located at wall thickness change
Place, at non-straight line segment, at chamfering, exterior part lap-joint, no less than 3 equal part cross sections；
Step 2: using the ovality of each equal part cross section upper housing of miking, the overproof section of mark ellipse degree, label
Elliptical long axis, minor axis location；
Step 3: deforming maximum cross-section by method installation shaping tooling first when shaping；
Shaping tooling installs principle are as follows: the equal partial cross-sections reversible deformation using over-sleeved Special shaping tooling makes, by 1 set/2 pair shaping works
The A point of dress is placed at transverse, and B point is placed at short axle, and using the biggish axis of deflection as measuring basis, reversible deformation numerical value is original
Begin to measure the 50% ~ 60% of numerical value；
Step 4: successively measuring the ovality in other sections, and shaping tooling is successively installed at overproof section；
Step 5: after repetition measurement shaping each cross-section ovality, it is consistent after each ellipticity and shaping；
Step 6: shaping tooling is after the installation is completed, shell is tempered together with tooling；
Step 7: removing shaping tooling after tempering, each ellipticity is measured；
Step 8: if each ellipticity terminates shaping within the scope of design objective, if still there is ellipticity overproof,
Secondary reshaping is carried out according to the method described above；
Do not install before shaping tooling at long axis having a size of diameter+2mm, after installation by size at this push for diameter -1.0mm ~
1.2mm。
2. the shaping methods of ultrahigh-strength steel thin-wall shell quenching distortion as described in claim 1, which is characterized in that the shell
The unimach material trade mark that body uses is 30Cr3SiNiMoVA.
3. the shaping methods of ultrahigh-strength steel thin-wall shell quenching distortion as claimed in claim 1 or 2, which is characterized in that
Under the premise of guaranteeing shell mechanical performance, temperature should increase 20 ± 10 DEG C when secondary reshaping is tempered.
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| CN107904383A (en) * | 2017-11-17 | 2018-04-13 | 西安长峰机电研究所 | A kind of method for controlling heat treatment deformation of T250 steel thin-wall tube-shaped element |
| CN109945823B (en) * | 2019-04-17 | 2021-09-14 | 株洲齿轮有限责任公司 | Method for detecting deformation of steel part in machining process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03155415A (en) * | 1989-11-10 | 1991-07-03 | Kubota Corp | Correcting method of ellipse of tube |
| CN1752224A (en) * | 2005-05-13 | 2006-03-29 | 瓦房店轴承集团有限责任公司 | Method for heat treatment coning of bearing |
| CN101684519A (en) * | 2009-06-29 | 2010-03-31 | 洛阳Lyc轴承有限公司 | Method for improving heat treatment deformation of thin-wall light narrow series bearing ring |
| CN104745794A (en) * | 2015-03-31 | 2015-07-01 | 常州天山重工机械有限公司 | Thin-wall carburization gear ring salt-bath quenching circle checking technology |
-
2015
- 2015-12-08 CN CN201510892600.8A patent/CN106854686B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03155415A (en) * | 1989-11-10 | 1991-07-03 | Kubota Corp | Correcting method of ellipse of tube |
| CN1752224A (en) * | 2005-05-13 | 2006-03-29 | 瓦房店轴承集团有限责任公司 | Method for heat treatment coning of bearing |
| CN101684519A (en) * | 2009-06-29 | 2010-03-31 | 洛阳Lyc轴承有限公司 | Method for improving heat treatment deformation of thin-wall light narrow series bearing ring |
| CN104745794A (en) * | 2015-03-31 | 2015-07-01 | 常州天山重工机械有限公司 | Thin-wall carburization gear ring salt-bath quenching circle checking technology |
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