CN1026996C - Quench method for metal card clothing - Google Patents
Quench method for metal card clothing Download PDFInfo
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- CN1026996C CN1026996C CN93106917A CN93106917A CN1026996C CN 1026996 C CN1026996 C CN 1026996C CN 93106917 A CN93106917 A CN 93106917A CN 93106917 A CN93106917 A CN 93106917A CN 1026996 C CN1026996 C CN 1026996C
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Abstract
The present invention provides a quenching method capable of enhancing tooth tip hardness and hardness uniformity. The process flow of the method comprises uncoiling, annealing treatment, quenching, tempering and coiling, or the process flow of the method comprises uncoiling, tooth punching, quenching and coiling. The process flow is characterized in that a method of quenching for two times is adopted for quenching treatment; the quenching temperature in the first time is from 800 to 840DEG C, and air injection or water spraying cooling is adopted; the quenching temperature in the second time is from 820 to 860DEG C, and oil cooling or water cooling is adopted. The length of two fire nozzles for quenching is from 25 to 45mm, and the distance between the two fire nozzles is from 150 to 250mm.
Description
The invention belongs to the quenching method field of metal heat treatmet.The thermal treatment of main suitable metal card clothing.
In order to make metallic card clothing good effects such as branch comb can be arranged, must guarantee that then metallic card clothing has sharp, attrition resistant crown to fiber (cotton or chemical fibre).
In the prior art,, adopt the heat treating method of primary quenching usually, crown is carried out selective hardening, in the primary quenching method, the quenching technology of two kinds of different flow processs is arranged, that is: again in order to improve the hardness of metallic card clothing crown
1. uncoiling → softening annealing → quenching → tempering → batch.Wherein, quenching temperature is 880～900 ℃.As shown in Figure 1 (" textile equipment production handbook, middle volume, spinstry press, 229～241 pages).
2. uncoiling → towards tooth → quench → batch.Wherein quenching temperature is 860～880 ℃.(" external textile equipment ", textile industry press, 46～52 pages) as shown in Figure 2.
The primary quenching method existing questions of above-mentioned two different flow processs is that crown hardness value fluctuation is bigger, and the hardness value mean level (ML) is on the low side, and the metallographic microstructure of crown is easy to alligatoring, causes the metallic card clothing crown not wear-resisting, and work-ing life is lower.This is owing to underlying cause causes.
Its reason is: according to working conditions, require metallic card clothing to have hard crown and soft matrix.Because crown is tiny, makes and to adopt the method for local fast heating that crown is carried out quench treatment in the actual production.But because of the operation requirement before quenching, the metallographic microstructure of metallic card clothing crown is the Spheroidizing Annealing tissue before quenching, promptly on the ferrite matrix of low carbon content, and the nodularization thing of uniform distribution high carbon content.Original structure state before this quenching, be not suitable for the rapid heating quenching method, because the crown that rapid heating is quenched can only stop the extremely short time (according to prior art, be 0.1～0.3 second quenching heat-up time of metallic card clothing crown) in the high temperature austenite district.In the so of short duration time, globular carbide has little time fully dissolving and diffusion, cause the zone that in ferrite matrix, still has many high carbon contents, so that the carbon content of matrix is very inhomogeneous, be difficult to guarantee reach higher hardness value after crown quenches, and the harmony of hardness value between the crown.If for the dissolving of high carbon content carbide, quench heat-up time (promptly increasing nozzles length) or improve flame temperature and prolong, certainly will cause the alligatoring of crown metallographic structure again, crown is become fragile, this obviously is inadvisable.
Above-mentioned promptly is that existing metallic card clothing quenching method makes crown hardness low, and big major cause fluctuates.
The object of the present invention is to provide and a kind ofly can improve metallic card clothing crown hardness, and make the metallic card clothing quenching method of all even crown microstructure thinning of crown hardness.
In order to achieve the above object, the technical solution adopted in the present invention is: adopt twice quenching method that the metallic card clothing crown is handled; Simultaneously, reduce quenching temperature, shorten crown heat-up time; Realize twice quenching by on the quenching technology production line of metallic card clothing finished product, being provided with, reduce flame temperature to reduce the fuel of supplying with nozzles at a distance of two nozzles of certain distance.
The quenching first time and self-tempering subsequently by crown make the metallographic microstructure of crown change tempered martensite+sorbite+carbide+residual austenite tissue into.The solid solution and the diffusion of carbon when this tissue helps quenching heating have for the second time been created favourable condition for improving crown hardness, simultaneously, because increasing of phase interface and crystal boundary face, help the refinement of quenching structure, by quenching for the first time, obtained ideal Preparedness Directorate like this.Quench the second time subsequently, makes the metallic card clothing crown obtain comparatively ideal metallographic microstructure, and promptly tempered martensite+minor amount of carbide+residual austenite finally obtains the comparatively ideal result that high rigidity combines with close grain.
Two concrete technical process of twice quenching method of metallic card clothing of the present invention are as follows:
(seeing accompanying drawing 3)
2. uncoiling → towards tooth → quenching → second time first time quenching → oil cooling → batch (seeing accompanying drawing 4).
In technique scheme, quenching temperature is 800～840 ℃ for the first time; Quenching temperature is 820～860 ℃ for the second time; 700～750 ℃ of annealing temperatures before quenching, the tempering temperature after quenching for the second time is 200～250 ℃; Nozzles length is 25～45mm; Distance between first nozzles and second nozzles is 150～250mm.Its nozzles length has on average shortened 35mm than 50～80mm of prior art; Simultaneously, owing to reduced the flow of fuel and combustion-supporting gas, though increased nozzles, the fuel consumption of the primary quenching method of fuel consumption and former employing remains basically stable.
Compared with prior art, the present invention has improved the hardness of metallic card clothing crown and the refinement significantly metallographic microstructure of crown increases substantially its work-ing life.Table 1 and table 2 are respectively the shared percentage ratio of different microhardness values in the present invention and the prior art crown, and the shared percentage ratio of various rank martensites in the crown metallographic microstructure.(table 1,2 is seen the literary composition back)
The invention will be further described below by accompanying drawing.
Accompanying drawing 1, accompanying drawing 2 are the process flow diagram of prior art metallic card clothing primary quenching method.
Accompanying drawing 3, accompanying drawing 4 are the quenching method process flow diagram of metallic card clothing of the present invention.
Accompanying drawing 1 is to accompanying drawing 4, and 1 is uncoiling, and 2 is towards tooth, and 3 is annealing furnace, and 4 is first nozzles, and 5 are the cooling mouth, and 6 is second nozzles, and 7 is oil or watercooler, and 8 is tempering stove, and 9 for batching, and 10 is the metallic card clothing steel band.
Can find out in the prior art processes flow process, to have only nozzles from accompanying drawing 1, accompanying drawing 2, promptly only be primary quenching; Its nozzles length is 50～80mm.
Find out in the technical process of the present invention, two nozzles (4 and 6) are arranged from accompanying drawing 3, accompanying drawing 4, can realize twice quenching; Nozzles length is 25～45mm, and nozzles 4 are 150～250mm with the spacing of nozzles 6; Cooling mouth 5 is arranged, so that implement quench cooled after first nozzles 4.The quench cooled mode can adopt jet or water spray cooling crown for the first time, also can adopt naturally cooling; The type of cooling one of quenching is to adopt water-cooled for the second time, need carry out temper subsequently, the 2nd, adopt oil cooling, and need not to carry out temper.
From accompanying drawing 3 as can be known, in one of technical process of the present invention, anneal is arranged before quenching, its objective is that the base portion metallographic structure that makes through cold worked metallic card clothing such as flattening and cuttings is recovered, and reduce hardness, after quenching for the second time, temper is arranged, main effect is when eliminating owing to the employing shrend, if the internal stress that forms in the crown when adopting deep fat as heat-eliminating medium, can not carried out tempering after the quenching.
According to the technical process shown in the accompanying drawing 3, metallic card clothing quenching process of the present invention is as follows: the metallic card clothing roll coil of strip is after uncoiling (1), entering annealing furnace (3) anneals, subsequently through first nozzles (4), crown is through local fast heating, in the extremely short time (0.1～0.2 second), reach predetermined quenching temperature, then realize quench cooled by cooling mouth (5), metallic card clothing crown after the cooling carries out the second time through second nozzles (6) rapidly and quenches, quench for the second time and in oil cooler (7), carry out oil cooling, enter reeling machine after the oil cooling and batch (9), promptly finish whole process flow.
Embodiment
Adopting two class technical process of twice quenching method of the present invention, is the quench treatment that 0.6% carbon steel metallic card clothing carries out four lot numbers to carbon content.After the quenching, four batches of metallic card clothing have been carried out the crown hardness measurement.Parameters in the technical process is as shown in table 3, to survey hardness value as shown in table 4.(table 3,4 is seen the literary composition back)
The shared percentage ratio of different microhardness values in table 1 crown
Quenching method microhardness (Hv200)
More than 900 800～900 700～below 800 700
Prior art primary quenching/69% 20% 11%
Twice quenching of the present invention 36% 64% //
The shared percentage ratio of various rank martensites in the table 2 crown microstructure
The percentage ratio that all kinds of microstructures are shared
Quenching method bodkin shape horse than the bodkin shape than the superfine martensite of fine acicular (or
Family name's body martensite martensite cryptocrystalline martensite)
Prior art primary quenching 16% 68% 16%/
Twice quenching of the present invention/11% 78% 11%
Table 3 embodiment quenching processing technology parameter
Annealing quenching for the first time is Q-tempering nozzles length two nozzles metallic card clothing for the second time
Lot number metal needle temperature quenching temperature Cooling Quenching temperature type of cooling temperature mm spacing travelling speed
The cloth trade mark ℃ ℃ mode ℃ and the oil temperature ℃ the one the second mm m/min
1 JC4-B, 700 800 water sprays, 820 water-cooleds 200 30 45 200 16
2 JC4-B, 750 840 jet 860 oil coolings 50 ℃/25 40 150 16
Jet 840 oil coolings 60 ℃/30 45 250 6 in 3 JT67A/820
4 JT67A/800 water sprays, 850 oil coolings 55 ℃/30 35 250 6
Twice quenching rear tooth point of table 4 embodiment metallic card clothing hardness value
Hardness microhardness value Hv200
Apart from tooth top apart from the distance tooth top apart from mm
Lot number 0.1 0.3 base portions
1 927 927 185
2 918 918 198
3 891 866 202
4 866 841 207
Claims (3)
1, a kind of quenching method of metallic card clothing, technical process comprises uncoiling, anneal, quenching, tempering and batches; Or uncoiling, towards tooth, quench and batch, it is characterized in that: adopt quench treatment twice, quenching temperature is 800～840 ℃ for the first time, adopts jet or water spray cools off; Quenching temperature is 820～840 ℃ for the second time, adopts oil cooling, or adopts water-cooled and tempering subsequently.
2, quenching method according to claim 1 is characterized in that the length of two water nozzles being used to quench is 25～45mm.
3,, it is characterized in that the distance between first nozzles and second nozzles is 150～250mm according to claim 1 and 2 described quenching method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93106917A CN1026996C (en) | 1993-06-17 | 1993-06-17 | Quench method for metal card clothing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93106917A CN1026996C (en) | 1993-06-17 | 1993-06-17 | Quench method for metal card clothing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1078497A CN1078497A (en) | 1993-11-17 |
| CN1026996C true CN1026996C (en) | 1994-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93106917A Expired - Fee Related CN1026996C (en) | 1993-06-17 | 1993-06-17 | Quench method for metal card clothing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1026996C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296384A (en) * | 2011-07-22 | 2011-12-28 | 青岛新鲁锋王针布有限公司 | Production process of metallic clothing |
| CN102776333A (en) * | 2012-07-16 | 2012-11-14 | 张家港海锅重型锻件有限公司 | Process for manufacturing 20Mn2 steel forgings |
| CN103695827B (en) * | 2014-01-06 | 2016-11-02 | 钢铁研究总院 | A kind of method eliminating high-temperature alloy material high temperature hardening break |
| DE102014108822A1 (en) * | 2014-06-24 | 2016-01-07 | TRüTZSCHLER GMBH & CO. KG | Process for hardening a clothing wire for processing textile fibers and installation therefor |
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1993
- 1993-06-17 CN CN93106917A patent/CN1026996C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1078497A (en) | 1993-11-17 |
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