CN1053398C - 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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- CN1053398C CN1053398C CN93121286A CN93121286A CN1053398C CN 1053398 C CN1053398 C CN 1053398C CN 93121286 A CN93121286 A CN 93121286A CN 93121286 A CN93121286 A CN 93121286A CN 1053398 C CN1053398 C CN 1053398C
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Abstract
The present invention belongs to the technical field of metal rolling. The present invention has the components of a white iron blade that 2.1 to 3.0 % of C, <1.0 % of Si, 0.8 to 1.5 % of Mn, 1.0 % of Cr, 0.3 to 0.8 % of Mo, 0.5 to 1.0 % of Cu, <0.05 % of P, and <0.05 % of S. The present invention can be used for continuously producing white cast iron casting blanks, the rolling temperature is from 750 to 1100 DEG, the rolling deformation rate is smaller than 70 %, the optimal rolling temperature is from 850 to 1000 DEG, and the optimum rolling deformation rate is from 50 to 60%. In the process of rolling, the present invention ensures that carbides have the advantages of sufficient crushing, compact tissues, high intensity, high toughness and high wear resistant properties. Compared with a cast blade, the present invention has the advantages that the impact toughness is improved by 1.85 to 3.66 times, the hardness averagely reaches HRC60, and the wear resistant properties are improved by 3 to 5 times. Besides, the present invention has the advantages of low cost, high productivity, long service life, etc.
Description
The invention belongs to metal rolled technical field.
Shot-blasting machine is widely used in the cleaning of foundry goods, forging, weldment and riveting parts, fields such as industrial derusting, surface peening.In the parts of ramming head device, the most serious with the wearing and tearing of blade.Thereby blade service life, weak point was 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, distributes but the carbide of ordinary white cast iron is that netted edge is brilliant, and it is low to have toughness, and easily the characteristics of brittle failure have 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 changes the structure of carbide phase by adding high alloy, thereby reaches the purpose of improving its distribution." Л и т e и н о e П р о н з в о д с т в о " № .2 in 1984, E.B. Б о л д ц 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, it 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, the concentrated wear of aggravation blade, make eight blades of same ramming head lose dynamic balancing, retired in advance, greatly reduce service life of blade.
The milling method that the purpose of this invention is to provide a kind of white iron shot blast machine blade, with impact flexibility, the wearability of raising white cast-iron, and service life, and reduced production cost.
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 the net carbide fragmentation, suspension, the even distribution that distributed along crystal boundary originally, increased substantially the impact flexibility of white cast-iron.
The present invention includes: the selection of white cast-iron chemical composition, the determining of white cast-iron rolling mill practice, the designs of roll pass etc. simultaneously, have systematically been 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: after casting warm 850-1100 ℃, and 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 ℃ guarantees 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 net deflection.According to this characteristics design roll pass and rolling mill practice.Can select two spoke four-pass closed types for use.Guarantee the dimensional accuracy of blade, simplified rolling mill practice.
Best rolling temperature 850-1100 ℃ 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 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, various defectives greatly reduce, even tissue, densification, grain refinement, wear weight loss is even, ramming head is protected and is treated fine dynamic balancing, prolong service life greatly, installation operation proof, and 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, has the production efficiency height, easily forms 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, it is big that the weight of each blade differs the school, 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, raises labour productivity.In addition; local heavy wear easily takes place, needs workman's running check, replacing in cast blade; and the densification of rolling white cast-iron leaf tissue, high tenacity, high-wearing feature; each pad wear is evenly weightless; the situation that certain a slice lost efficacy in advance can not take place; dawn is easy to install, and has prevented frequent shutdown inspection and influences ordinary production.
(2) since service life of rolling blade be 3～5 times of cast blade at least, have significantly energy-conservation, the material-saving effect.
(3) improve workman's working condition: traditional blade production technology is to use sand casting, working condition is relatively poor, rolling white cast-iron blade production technology advanced person, and workman's work situation improves, reduce environmental pollution, prevented the incident anthraco-silicosis of foundry worker.
Claims (2)
1. the milling method of a white iron shot blast machine blade is characterized in that white iron composition 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%, S＜0.05% adopts the method for continuous pouring to produce the white iron strand, and strand is heated to 750～1100 ℃, be rolled rolling deformation rate control＜70%.
2. according to the described white iron blade of claim 1 milling method, it is characterized in that best rolling temperature is 850～1000 ℃, the rolling deformation rate is controlled at 50～60%.
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1104562A CN1104562A (en) | 1995-07-05 |
| CN1053398C true CN1053398C (en) | 2000-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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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Families Citing this family (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 |
| JP4523776B2 (en) | 2003-02-12 | 2010-08-11 | 新日本製鐵株式会社 | Cast iron and manufacturing method thereof |
| 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 |
Citations (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 |
| CN1054801A (en) * | 1991-04-01 | 1991-09-25 | 河北工学院 | High-strength low-alloy white cast-iron grinding ball and manufacture method thereof |
-
1993
- 1993-12-30 CN CN93121286A patent/CN1053398C/en not_active Expired - Fee Related
Patent Citations (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 |
| CN1054801A (en) * | 1991-04-01 | 1991-09-25 | 河北工学院 | High-strength low-alloy white cast-iron grinding ball and manufacture method thereof |
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| Publication number | Publication date |
|---|---|
| CN1104562A (en) | 1995-07-05 |
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