CN1140107A - Microstress high-strength cold-drawn steel section and mfg. method thereof - Google Patents
Microstress high-strength cold-drawn steel section and mfg. method thereof Download PDFInfo
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- CN1140107A CN1140107A CN 96104675 CN96104675A CN1140107A CN 1140107 A CN1140107 A CN 1140107A CN 96104675 CN96104675 CN 96104675 CN 96104675 A CN96104675 A CN 96104675A CN 1140107 A CN1140107 A CN 1140107A
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Abstract
A cold drawn microstress high-strength steel material having better mechanical performance, high size accuracy and very low residual stress is made up through the first and the second drawing, modification, natural ageing and the third drawing with three drawing dies. Said steel material is especially suitable for slender axle and strict parts.
Description
The invention belongs to the processing of shape, it relates to a kind of novel starting material and manufacture method thereof.
The steel that provided in existing mechanical workout have the two states of hot rolling and cold-drawn, crystal grain is thick and inhomogeneous in their metallographic structure, do not possess mechanical propertys such as higher rigidity, intensity, and have higher unrelieved stress on surface and inside, therefore must cause flexural deformation when on the cold-drawn blank, doing asymmetric and uneven cutting, just can make the workpiece of processing reach design requirements so in mechanical processing process, must cooperate with repeatedly thermal treatment.In addition, all there is bigger difficulty in the processing of part in addition for thin and long shafts in cutting and thermal treatment.Its key is that the unrelieved stress elimination in each procedure is unclean, distortion is just unavoidable, for axle class simple in structure part in addition, especially elongated axle class in addition part if there is the raw material supply of low-stress high-mechanical property and high dimensional accuracy then can be convenient to manufacturing and cut down finished cost.But know the precedent of the former material blank unavailability still of aforesaid low-stress or microstress, high-mechanical property, high dimensional accuracy through investigation.It is as follows to pick up the relevant patent that rope obtains through Patent Office of the People's Republic of China: 1. U.S.4047418 " the cold-drawn straightening combination machine of using for metal tube or metal bar ", it is that equipment is closed in cold-drawn and straightening, it then remakes one to secondary straightening through one to redraing with blank, the cold mould of drawing, the straightening roller of biasing; 2. clear 64-22412 " meta austenitic steel bar ferromagnetism hubbing ", it provides the equipment for hard magnetization material drawing processing, this equipment adopts two drawing die processing, to reduce the temperature rise that workpiece deformation causes, this material is the part in addition that is used for gauge sensor, in order to measuring, and demonstrate fork-like farm tool used in ancient China with numeral or scale in tensile, compressive, bending, the variation of magnetic flux when turning round; 3. clear 58-90317 " production method of nickel yittrium alloy line " provides nickel yittrium alloy line to be drawn into the general course of processing of silk after annealing, and the diameter of this nickel yttrium alloy wire is very little, uses as nichrome wire; 4. clear 63-176545 " STAINLESS STEEL WIRE ", what it was said is the drawing process of STAINLESS STEEL WIRE.More than four pieces of patents of picking up rope all relevant with the process of drawing, all do not relate to stress problem, all spoken of general annealing, these operations all are routine operations also, do not mention and use special thermal treatment means to make workpiece or starting material reach the purpose of special low-stress.
The purpose of this invention is to provide a kind of have high-mechanical property, high dimensional accuracy, starting material and working method thereof that its unrelieved stress is extremely low, it for axle class simple in structure in addition part particularly thin and long shafts other the processing of part create condition easily, can significantly reduce cost, and the manufacture method that it provides is simple, and the meaning of generally promoting is arranged.
By as above design, the microstress high-strength cold-drawn steel section that this programme provided has circle, square or hexagonal cross section, it is characterized in that it has humble stress and high-mechanical property, the surface residual stress of these steel is 5.8～25MPa, and the unrelieved stress of its shallow internal layer is 0～7.8MPa; Its hardness is HRc15～30 in its mechanical property, and its tensile strength is 620～1000N/mm
2, size and form accuracy are 6 grades.For realizing aforesaid cold drawn steel, its process for making comprises in annealing in the thermal treatment, the pickling and the cold-drawn of washing and section bar, it is characterized in that it adopts the operation of three road cold-drawns, before the cold essence in the 3rd road is pulled out, increase modifier treatment, after modifier treatment, be provided with the processing of natural aging.
The cold essence in the 3rd road in this programme is pulled out operation and is only finished the small essence amount of pulling out, and with three road cold-drawn mould non-stop runs.Natural aging before the cold essence in the 3rd road is pulled out operation is 20 to 30 days.
Adopt this programme can embody following superiority: the starting material of (1) this programme had increased modified operation before the 3rd road cold-drawn it can improve intensity, thinning microstructure also eliminates stress, before pulling out operation, the 3rd road essence increased natural aging, eliminate the unrelieved stress of a part again, it is very little to pull out the drawing surplus of finishing in the operation in the 3rd road essence, three drawing die non-stop runs have been adopted, therefore the surface starting material that mechanical property is good with inner unrelieved stress is minimum have been obtained, the result who detects through the expert proves that the starting material of this premium properties are preceding unprecedented, only on the numerical value of unrelieved stress, compare quite their 1/tens, not on an order of magnitude with general starting material; (2) use this starting material as the axle class in addition part particularly thin and long shafts in addition part use and can accomplish few processing or not have processing, can save and reduce cost man-hour; (3) because the unrelieved stress of this material is extremely low, therefore can guarantee the quality of workpiece, indeformable in the course of processing, and also can not be out of shape in the long term operation afterwards; (4) use this kind starting material to process some hardness and do not require that very high part in addition also can guarantee the processing quality that it is good, because it has much higher mechanical property than the starting material of hot rolling and cold-drawn state, it has certain rigidity, intensity, structure refinement, surface to have preferably dimensional precision and glossiness and extremely low unrelieved stress is arranged; (5) it is specially adapted to that a few thing environment is abominable, temperature variation is violent and the processing of part in addition of accuracy requirement strictness, as weapons, aircraft or space flight apparatus etc.; (6) this programme also can provide odd-shaped hexagonal steel and square steel except round steel is provided, and can adapt to the needs of many-sided mechanical workout.
Further specify the embodiment of this programme now.The high-intensity cold drawn steel of the microstress of this programme is to realize by following technological process.
1. the wire rod that will desire draw is earlier made anneal, keeps 8 hours down at 860 ℃;
2. annealed material is done pickling, neutralization, washing processing;
3. the first road drawing procedure is removed pimple;
4. anneal kept 8 hours down at 860 ℃;
5. pickling, neutralization, washing are handled;
6. the second road drawing procedure, staying essence to pull out surplus is to survive 8～10 times of surface size accuracy tolerance;
7. modifier treatment, at 850 ℃ of following oil coolings or cold quenching, 400 ℃ of tempering kept 5 hours;
8. natural aging treatment was placed 20～30 days;
9. the 3rd road drawing procedure, promptly essence is pulled out operation, with the non-stop run of three concentric cold-drawn moulds, reaches dimensional requirement.
The high-quality raw material that this programme provided has rounded section, also has square and sexangle special crosssection, and it has mechanical property preferably, and its tensile strength is 620～1000N/mm
2, hardness is HRc15～30.Main is that it has extremely low unrelieved stress, and its surperficial residual tension is 5.8～25MPa, is 1/5～1/10 of general cold-drawn starting material residual tension; The residual tension of its shallow internal layer is 0～7.8MPa, and only quite general cold-drawn is raw-material 1/50～1/80, therefore is not difficult to find out the raw-material high-quality grade of this kind.Had this kind fine starting material can be a class in addition part especially the making of the part in addition of thin and long shafts realize processing less or not having the convenience of processing, can raise the efficiency, reduce cost, improve processing quality.The other pieces of utilizing this kind steel to make also can obtain desirable and stable processing quality.The trial product of this programme is through using the examination proof: other part that the raw-material stable performance of this kind, these starting material are made is indeformable through life-time service.It is specially adapted to that working conditions is abominable, temperature variation is violent, quality and precision all require the making of part in addition of very strict machine.Therefore it is subjected to trier's welcome deeply.
Claims (4)
1. high-intensity cold drawn steel of microstress, it has circle, square or hexagonal cross section, it is characterized in that it has humble stress and high-mechanical property, the surface residual stress of these steel is 5.8～25MPa, and the unrelieved stress of its shallow internal layer is 0～7.8MPa; Its hardness is HRc15～30 in its mechanical property, and its tensile strength is 620～1000N/mm
2, size and form accuracy are 6 grades.
2. manufacture method that realizes the high-intensity cold drawn steel of microstress of claim 1, its technological process comprises in annealing in the thermal treatment, the pickling and the cold-drawn of washing and section bar, it is characterized in that it adopts the operation of three road cold-drawns, before the cold essence in the 3rd road is pulled out, increase modifier treatment, after modifier treatment, also be provided with the processing of natural aging.
3. according to the manufacture method of the described cold drawn steel of claim 2, it is characterized in that the cold essence in the 3rd road pulls out the essence amount of pulling out that operation is only finished trace, and with three road cold-drawn mould non-stop runs.
4. according to the manufacture method of the described cold drawn steel of claim 2, it is characterized in that the natural aging before the cold essence in the 3rd road is pulled out operation is 20 to 30 days.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96104675 CN1231306C (en) | 1996-04-18 | 1996-04-18 | Microstress high-strength cold-drawn steel section and mfg. method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96104675 CN1231306C (en) | 1996-04-18 | 1996-04-18 | Microstress high-strength cold-drawn steel section and mfg. method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1140107A true CN1140107A (en) | 1997-01-15 |
| CN1231306C CN1231306C (en) | 2005-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96104675 Expired - Fee Related CN1231306C (en) | 1996-04-18 | 1996-04-18 | Microstress high-strength cold-drawn steel section and mfg. method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN1231306C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102909227A (en) * | 2012-10-23 | 2013-02-06 | 赵建生 | Full-automatic drawing process of bright lines |
| CN106269938A (en) * | 2016-08-31 | 2017-01-04 | 湖北加恒实业有限公司 | A kind of processing method of cold-drawn piston rod |
| CN107497868A (en) * | 2017-09-01 | 2017-12-22 | 浙江毅美材料有限公司 | A kind of Hubbing method of steel wire |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102912251B (en) * | 2012-11-13 | 2014-07-30 | 河南龙成重型钢结构有限公司 | High strength microstress steel and production process thereof |
-
1996
- 1996-04-18 CN CN 96104675 patent/CN1231306C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102909227A (en) * | 2012-10-23 | 2013-02-06 | 赵建生 | Full-automatic drawing process of bright lines |
| CN106269938A (en) * | 2016-08-31 | 2017-01-04 | 湖北加恒实业有限公司 | A kind of processing method of cold-drawn piston rod |
| CN107497868A (en) * | 2017-09-01 | 2017-12-22 | 浙江毅美材料有限公司 | A kind of Hubbing method of steel wire |
| CN107497868B (en) * | 2017-09-01 | 2018-12-18 | 浙江毅美材料有限公司 | A kind of Hubbing method of steel wire |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1231306C (en) | 2005-12-14 |
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Granted publication date: 20051214 |