CN1104562A - Process for rolling white iron blades of ball thrower - Google Patents
Process for rolling white iron blades of ball thrower Download PDFInfo
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- CN1104562A CN1104562A CN 93121286 CN93121286A CN1104562A CN 1104562 A CN1104562 A CN 1104562A CN 93121286 CN93121286 CN 93121286 CN 93121286 A CN93121286 A CN 93121286A CN 1104562 A CN1104562 A CN 1104562A
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Abstract
The conticast white iron blade contains chemically C (2.1-3.0%), Si (<1.0%), Mn (0.8-1.5%), Cr (1.0%), Mo (0.3-0.8%), Cu (0.5-1.0%), P (<0.05%) and S(<0.05%). Its rolling temp. is 750-1100 deg.C and rolling deformation rate is < 70%. Its rolling process can fully break the carbides. It has compact structure, and the most strength, toughness and antiwear nature. Compared with cast blade, the rolled blade features higher impact toughness, hardness and antiwear nature.
Description
The invention belongs to metal rolled technical field
Shot-blasting machine is widely used in fields such as the cleaning, industrial derusting, surface peening of foundry goods, forging, weldment and riveting parts.In the parts of ramming head device, the most serious with the wearing and tearing of blade.Thereby the weak point of leaf longevity is the common problem that current domestic each factory runs into.
At present, the shot blast machine blade that uses is both at home and abroad cast with white cast-iron and is formed.Because the existence of hard phase carbide, white cast-iron has good wear resistance.But the carbide of ordinary white cast iron is nettedly to distribute along brilliant, has that toughness is low, the characteristics of easy brittle failure, has limited its use.Thereby the researcher attempts by the form of improving carbide and the obdurability that distributes the raising white cast-iron, to improve its wear resistence always both at home and abroad.At present, following several method is arranged:
High-alloying.Change the structure of carbide phase by adding high alloy, thereby reach the purpose of improving its distribution." Л н т e и н о e П р о и з в о д с т в о " № 2 in 1984, Е. В. Б о л д ы р e в.The chemical composition of high-chromium white cast iron is: 3.0～3.2%C, 0.7～0.9%Si, 0.4～0.6%Mn, 21～23%Cr, 0.1～0.2%V.Using maximum is high-chromium white cast iron.But because high alloy increases substantially cost.So the raising in the service life of high alloy white cast-iron does not demonstrate absolute advantage with respect to higher cost of alloy.At present, the service life of high-chromium white cast iron blade is on average between 200～300 hours.This kind material blade uses more abroad.
Adopt the method for rotten, heat treatment, low alloying to realize improving the purpose of distribution of carbides.Said method is widely used in China because cost is lower.But these methods can't obviously change distribution, the shape of carbide at present, substantially still net distribution.Therefore, toughness and wear resistence are still lower.Shot blast machine blade service life of this kind material is generally at 50～70 hours, preferably can reach about 150 hours through suitable alloying, rotten, heat treatment etc.
Casting white iron Blade Properties is removed and is subjected to the influence of organizational factor, also has a fatal weakness, is exactly the existence of various casting flaws.And these casting flaws are very easily brought out the germinating of crackle and are grown up, and the concentrated wear of aggravation blade makes eight blades of same ramming head lose dynamic balancing, and is retired in advance, greatly reduce the service life of blade.
The objective of the invention is to adopt the method for rolling white cast-iron to produce the white cast-iron blade, by rolling fragmentation the net carbide that distributes along crystal boundary, thereby improved the distribution of the form of carbide, then increased substantially impact flexibility, the wearability of white cast-iron, and service life.Therefore, available rolling white cast-iron replaces the high alloy white cast-iron, has reduced production cost widely.
The ordinary white cast iron that to the effect that adopts of the present invention, its composition: 2.1-3.0%C,＜1.0%Si, 0.8-1.5%Mn, 1.0%Cr, 0.3-0.8%Mo, 0.5-1.0%Cu,＜0.05%P,＜0.05%S.Adopting rolling white cast-iron blade is a kind of brand-new technology.Rolling temperature is 750～1100 ℃, and the rolling deformation rate is＜70%.The characteristics of this technology are that the improvement with the moulding process of blade and white cast-iron material organically combines.At first, adopt the method for high temperature rolling distortion, fundamentally change distribution of carbides and form, make net carbide fragmentation, the suspension that distributed along crystal boundary originally, the impact flexibility that has evenly distributed, increased substantially white cast-iron.
The present invention includes: the selection of white cast-iron chemical composition, the white cast-iron rolling mill practice determine the design of roll pass etc.Simultaneously, systematically studied the wear-resistant mechanism of rolling white cast-iron aspect theoretical.
The selection of chemical composition of the present invention, should guarantee that material has good rolling performance and utilizes waste heat to obtain martensite-bainite complex matrix tissue under air cooling or air-cooled condition, and evenly distribute enough massive carbides and secondary fine carbide, make mechanical performance, impact flexibility and wear resistence reach optimum value.C：2.1-3.0%、Si＜1.0%、Mn：0.8-1.5%、Cr：1.0%、Mo：0.30-0.80%、Cu：0.5-1.0%、P＜0.05%、S＜0.05%。
The blank of white cast-iron of the present invention adopts continuous cast method production to obtain.Big according to white cast-iron resistance of deformation in the operation of rolling, the characteristics that the ability of spreading is little, and the requirement of best distortion, design crystallizer size guarantees rolling blade dimensions precision.Casting parameters is: 850～1100 ℃ of casting temperature, casting speed 1.0-2.5m/min.
High temperature rolling performance, the normal temperature performance of determining to take all factors into consideration white cast-iron of rolling technological parameter of the present invention according to the deformation characteristics of white cast-iron, determine:
(1) rolling temperature: 750～1100 ℃ guarantee that rolling power consumption is low, and rolling leaf quality is stable.
(2) rolling deformation rate:＜70% guarantees that carbide is fully broken, has maximum intensity, toughness and wear resistence.
As cast condition white cast-iron of the present invention is rolling the preceding initial stage, and it is netted that carbide is, and thermoplasticity is relatively poor, should adopt little deflection.According to this characteristics design roll pass and rolling mill practice.Can select two roller four-pass closed types for use.Guarantee the dimensional accuracy of blade, simplified rolling mill practice.
850～1000 ℃ of the best rolling temperatures of white cast-iron of the present invention, best rolling deformation rate 50～60%.
The rolling white cast-iron blade technology of the present invention has the following advantages:
(1) is organized as massive carbide+acinous proeutectoid carbide, is distributed on the martensite-bainite matrix, have good obdurability.Its impact flexibility is 2.85～3.66 times of cast blade, and about the average HRc60 of hardness, wear resistence improves 3～5 times.
(2) rolling white cast-iron blade has the surface smoothness height, and various defectives greatly reduce, even tissue, densification, grain refinement.Wear weight loss is even, and ramming head keeps fine dynamic balancing, and prolong service life greatly.Installation operation proof, be 3～5 times in cast iron blade the service life of rolling white cast-iron blade.
(3) compare with cast blade, rolling white cast-iron blade dimensions precision height differs between each sheet and has only 2～3 grams.Have the production efficiency height, easily form automatic batch production, characteristics easy to install.
The present invention is by 500 tons of rolling blades of annual output, and commercial value is tentative identical with cast blade, 9000 yuan per ton of present price lattice.
Rolling the front vane cost is:
The pig iron, steel scrap are by 1800 yuan per ton
600 yuan in alloy blade per ton
780 yuan in power consumption blade per ton
133 yuan in depreciation of equipment blade per ton
It is 2319 yuan that labor management and other expense account for above-mentioned expense 70%
5630 yuan of rolling blade costs per ton
Benefit 9000-5670=3370 per ton unit
Year benefit 3370 * 500=1685000 unit
The present invention more than ten thousand tons, mostly adopts low chromium rare earth white cast-iron, by the method production of casting with the annual shot blast machine blade consumption of China at present.If all be that rolling white cast-iron blade replaces, a year benefit reaches 3,360 ten thousand yuan.And exceed 3～5 times of cast blades the service life of rolling white cast-iron blade.The social benefit of its generation also shows the following aspects except that direct economic benefit:
(1) raise labour productivity: the blade of Foundry Production adopts the method for hand moulding more, and production efficiency is lower, and percent defective is higher.Simultaneously, for keeping the dynamic balancing of ramming head, require every leaf weight difference less than 10 grams.Because the blade dimensions poor stability of Foundry Production, the weight of each blade differs bigger, has influenced production efficiency.And rolling white cast-iron blade adopts the method for continuous casting to produce blank (being permanent mold casting at present), through roll forming, and the production efficiency height.Simultaneously, because the dimensional accuracy height, the weight difference of each sheet has only several grams, has improved labor productivity.In addition, local heavy wear easily takes place in cast blade, needs workman's running check, replacing.And the densification of rolling white cast-iron leaf tissue, high tenacity, high-wearing feature, each pad wear is evenly weightless, and the situation that certain a slice lost efficacy in advance can not take place, and is easy to install, and has prevented frequent shutdown inspection and influences ordinary production.
(2) because be 3～5 times of cast blade the service life of rolling blade at least, has significantly energy-conservation, material-saving effect.
(3) improve workman's working condition: traditional blade production technology is to use sand casting, and working condition is relatively poor.Rolling white cast-iron blade production technology advanced person, workman's work situation improves, and has reduced environmental pollution, has prevented the incident anthraco-silicosis of foundry worker.
(4) white cast-iron is rolling as a brand-new production technology, and the successful Application in shot blast machine blade production provides a new thinking and method for the Strengthening and Toughening of white cast-iron.If this technology is generalized in the production of other white cast iron wear-resistant spare, will produce more obvious social benefit.
Claims (3)
1, rolling white cast-iron blade, the white cast-iron composition is 3.0%C, 0.7-0.8%Si, contain elements such as manganese, chromium, it is characterized in that containing 2.1～3.0%C,＜1.0%Si, 0.8～1.5%Mn, 1.0%Cr, 0.3～0.8%Mo, 0.5～1.0%Cu, P＜0.05%, the white cast-iron of S＜0.05%, available continuous casting is produced the white cast-iron strand, 750～1100 ℃ of rolling temperatures, rolling deformation rate≤80%.
2, according to the described rolling white cast-iron blade of claim 1., it is characterized in that best rolling temperature: 850～1000 ℃, best rolling deformation rate: 50～60%.
3, according to the described rolling white cast-iron blade of claim 1., it is characterized in that casting parameters, the casting temperature: 850～1100 ℃, casting speed: 1.0～2.5m/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93121286A CN1053398C (en) | 1993-12-30 | 1993-12-30 | Process for rolling white iron blades of ball thrower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93121286A CN1053398C (en) | 1993-12-30 | 1993-12-30 | Process for rolling white iron blades of ball thrower |
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| Publication Number | Publication Date |
|---|---|
| CN1104562A true CN1104562A (en) | 1995-07-05 |
| CN1053398C CN1053398C (en) | 2000-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN93121286A Expired - Fee Related CN1053398C (en) | 1993-12-30 | 1993-12-30 | Process for rolling white iron blades of ball thrower |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1751134B (en) * | 2003-02-12 | 2010-09-08 | 新日本制铁株式会社 | Cast iron billet excelling in workability and process for producing the same |
| US8302667B2 (en) | 2003-02-12 | 2012-11-06 | Nippon Steel Corporation | Cast iron semi-finished product excellent in workability and method of production of the same |
| CN106734898A (en) * | 2016-12-28 | 2017-05-31 | 成都航空职业技术学院 | The casting method of wear-resistant shot blast machine blade |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043754A (en) * | 1988-12-21 | 1990-07-11 | 机械制造工艺科学生产联合公司 | Spheroidal graphite cast iron |
| CN1020760C (en) * | 1991-04-01 | 1993-05-19 | 河北工学院 | High-strength low-alloy white cast-iron grinding ball and its manufacturing method |
-
1993
- 1993-12-30 CN CN93121286A patent/CN1053398C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1751134B (en) * | 2003-02-12 | 2010-09-08 | 新日本制铁株式会社 | Cast iron billet excelling in workability and process for producing the same |
| US8302667B2 (en) | 2003-02-12 | 2012-11-06 | Nippon Steel Corporation | Cast iron semi-finished product excellent in workability and method of production of the same |
| CN106734898A (en) * | 2016-12-28 | 2017-05-31 | 成都航空职业技术学院 | The casting method of wear-resistant shot blast machine blade |
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| Publication number | Publication date |
|---|---|
| CN1053398C (en) | 2000-06-14 |
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