CN86107631A - Roller of centrifugal composite vanadium titanium cast iron and casting method - Google Patents
Roller of centrifugal composite vanadium titanium cast iron and casting method Download PDFInfo
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- CN86107631A CN86107631A CN86107631.1A CN86107631A CN86107631A CN 86107631 A CN86107631 A CN 86107631A CN 86107631 A CN86107631 A CN 86107631A CN 86107631 A CN86107631 A CN 86107631A
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Abstract
The present invention is centrifugal compounding vanadium titanium cast iron roll and casting method.It is characterized in that body of roll working lining is a vanadium titanium chilled cast iron, core is a spheroidal graphite cast-iron.Composition coupling by adjusting two-layer molten iron during casting and composition and the tissue of controlling the mixed zone are handled in the stokehold of working lining molten iron become different is so that obtain reliable metallurgical binding in the casting process parameters scope of broad; Rotating speed when filling out core by control and temperature are removed being mingled with and oxide-film on the working lining inner surface.The present invention can utilize the vanadium titanium iron batching, does not need the specific alloy element, does not also need special observing and controlling means, and is easy and simple to handle, can guarantee composite quality, the yield rate height.
Description
The invention belongs to the centrifugally cast composite roll field, is the improvement of composite roll and casting method thereof.
Centrifugally cast composite roll is a kind of advanced person's a production technology.It is reported that the process of countries in the world employing at present is nothing more than three kinds: (1) flux protection and control cast parameter; (2) adopt special pouring type; (3) without flux, control cast parameter.The main feature of these methods is as follows:
1 flux protection and control cast parameter
This method Japan Patent (special permission communique clear 54-23851 number) and the existing introduction of BP (No. 1216766); mainly utilize the composite fluxing agent freezing point to hang down and in the operating temperature range of broadness, change little characteristic with viscosity; when centrifugal casting, make to form the uniform flux protection film of a layer thickness on the total inner surface of outer layer metal and prevent burning, guarantee the welding quality between double layer of metal.But work will increase cost and content of operation like this, and cast parameter mismate also can produce compound bad defective.
2 adopt special pouring type
This method United States Patent (USP) (No. 3754593) is existing to be introduced.It is at outer molten steel solidification after to a certain degree, stop operating, allow the layer of metal of inner surface ot-yet-hardened wander to the casting mold of bottom, to expose the composite quality that clean mating surface guarantees two-layer gold layer, then at inactive state cast core molten iron together with the pollutant on it.Though this method is feasible in theory, in practice,, and also exist difficulty in the operation because that the inertia of centrifuge will brake fast is very difficult.Because stall is too early, the set strength of outer shell is not enough, can cause the whole slump of shell.Stall is slow excessively, can cause the pollution layer of inner surface not wander down because of the shell endosexine lacks necessary flowability again.
3 without flux, control cast parameter
This method is by control cast parameter: outer pouring temperature; Fill out core blanking time; The temperature of outer inner surface when filling out core; Fill out the core pouring temperature; Rotating speed and pouring type etc. make mating surface be under the certain physical state (as starchiness) and fill out core, thereby the melting welding of two parts metal is got up.Though this method is fairly simple, also without flux, poor reliability.Because the prerequisite of this method is that two parts metal has suitable physical state when filling out core, and this state mainly guarantees by strict fusion temperature.Because outer molten iron of having poured into a mould and core molten iron to be cast are in separately the independently state of cooling, require to reach simultaneously required separately technological temperature, this fills out in the core selection on opportunity and to all existing the so far not fine as yet difficulty that overcomes on the thermometric of rotational shell inner surface no matter on Cooling Control.Often cross low and compound badly in practice, or cause chill depth not enough and transition region is wide, the defective of combined strength bination decline because of fusion temperature is too high because of fusion temperature.
More than the defective of three kinds of methods be that only to take measures from process aspect be that the metallurgical binding of double layer of metal is created necessary condition, the fluctuation range of technological parameter requires tighter, operation and detection difficult are so can not overcome lack of fusion and chill depth and width of transition zone problem out of control effectively.
In addition, the roll material aspect, at present multiselect does not still have a kind of vanadium titanium iron resource of only utilizing China's abundant with expensive scarce alloying elements such as nickel, chromium, molybdenums, without the vanadium-titanium cast iron roll of the super quality and competitive price of other specific alloy elements.
The object of the present invention is to provide a kind of composite roll of new material and to the improved a kind of casting method of above-mentioned the third roll centre spinning method, so that make full use of the vanadium titanium iron resource of China, save expensive scarce alloying element, relax the control of process parameters scope, simplify the operation, improve product percent of pass.
Vertical centrifugal casting composite roll provided by the present invention, body of roll working lining are vanadium titanium chilled cast iron, and core is a spheroidal graphite cast-iron.
The composition of working lining vanadium titanium chilled cast iron is: C3.2-3.9%, Si0.3-0.9%, Mn0.5-1.1%, P≤0.3%, S≤0.03%, V0.2-0.5%, Ti＜0.1%, Mg＜0.03%, RE0.02-0.04%; The composition of core spheroidal graphite cast-iron is: C3.0-3.7%, Si2.0-2.6%, Mn0.5-0.8%, P≤0.2%, S≤0.03%, Mg 〉=0.02%, RE0.02-0.04%.
Vertical centrifugal casting composite roll provided by the present invention, chill depth difference are in 5 millimeters, and thin thick characteristics under having.Thin down thick this feature is the good sign of double layer of metal fusion, differentiates that with it composite quality can save ultrasound examination.
The method of vertical centrifugal casting composite roll provided by the present invention is by the composition coupling of adjusting two-layer molten iron and the working lining molten iron is carried out the stokehold handle, composition and the tissue of controlling the mixed zone become different, to relax the control range of casting process parameters, obtain reliable metallurgical binding; Rotating speed when filling out core by control and temperature are removed being mingled with and oxide-film on the mating surface.
So-called composition coupling is meant that mainly the carbon equivalent of working lining and core molten iron is approaching as far as possible; Handle so-called stokehold to the working lining molten iron, is meant after molten iron is come out of the stove and handles with about 1% magnesium-rare earth or rare earth ferrosilicon alloy, its objective is that the molten iron that makes the mixed zone can all form spheroidal graphite cast-iron in the mixing ratio scope of broad, to guarantee combined strength bination.
Method provided by the present invention, its technological process is:
The main technologic parameters that will control in the technological process is as follows:
The pouring temperature of working lining molten iron is above 170-230 ℃ of an eutectic temperature (Tc);
Gravity coefficient value (G during cast
Outward) be 60～90;
The cast fixed thickness of working lining molten iron is constant, is generally 2 times of required chill depth mean value;
Chill depth is by finish control blanking time when filling out core of working lining cast, adjusts can obtain to pour into a mould thickness this blanking time and subtract 10 millimeters chills with the interior various degree of depth;
The working lining cast finishes and was generally 1～5 minute to the blanking time of filling out core;
The pouring temperature of core molten iron is above 80～150 ℃ of the eutectic temperature (Tc) of working lining molten iron, is about 1200～1280 ℃;
Gravity coefficient value (G when filling out core
Outward) be 40～70;
Mold wash is a carbon-base coating;
Mold temperature during cast is 70～120 ℃.
The present invention has following advantage:
1 has reliable metallurgical binding, has eliminated compound defective products basically, bond strength σ
b〉=290MN/m
2;
2 body surface hardness 〉=65Hs, chill is axial and radial stiffness is poor≤5Hs;
3 cast thickness are when constant, and the chill depth adjustable range is wide, and the roll chill depth is poor＜and 5 millimeters;
4 core intensity σ
b〉=340MN/m
2;
5 roll cutting processabilities are good;
6 do not need special installation and detection means, and easy and simple to handle being easy to controlled;
7 roll costs are lower, and wearability is good, and the life-span is higher more than 50% than low nickel chromium triangle well-established law roll.
Embodiment:
Dimension of roller: φ 270 * 600
The working lining molten iron melts with intermediate frequency furnace, core molten iron cupola melting.
Batching: the charge composition of working lining molten iron is a vanadium titanium iron 90%, steel scrap 10%, Mn
10.25%, Si
750.2%, FeP
10.9%; The charge composition of core molten iron is a vanadium titanium iron 44%, roll foundry return 56%, Mn
10.44%, Si
750.22%, FeP
10.33%.
Handle the stokehold: the working lining molten iron adds RMg7-81.0%, and the core molten iron adds RMg7-82.0%+Si
750.4%.
Alloying component: working lining vanadium titanium chilled cast iron is C3.74%, Si0.55%, Mn0.68%, P0.28%, S0.0206%, V0.45%, Ti0.067%, Mg trace, RE0.021%; Core spheroidal graphite cast-iron is C3.06%, Si2.40%, Mn0.632%, P0.180%, S0.0194%, Mg0.021%, RE0.026%.
Technological parameter:
80 ℃ of mold temperatures, coating are carbon-base coating.
1470 ℃ of working lining molten iron tapping temperatures.1330 ℃ of pouring temperatures, 700 rev/mins of centrifuge speeds, 200 kilograms of pouring molten iron weight.
The cast of working lining molten iron finished to 210 seconds blanking times of filling out core.
1400 ℃ of core molten iron tapping temperatures, 1240 ℃ of pouring temperatures, 600 rev/mins of centrifuge speeds, power consumption brake of cast later stage and teeming.
Roll quality:
Hardness of roll body 66Hs, roll neck hardness 48Hs, 30 millimeters of chill depth upper ends, 28 millimeters of lower ends.
Claims (6)
1, a kind of composite roll of vertical centrifugal casting is characterized in that body of roll working lining is a vanadium titanium chilled cast iron, and core is a spheroidal graphite cast-iron.
2, roll according to claim 1 is characterized in that the composition of working lining vanadium titanium chilled cast iron is: C3.2-3.9%, Si0.3-0.9%, Mn0.5-1.1%, P≤0.3%, S≤0.03%, V0.2-0.5%, Ti＜0.1%, Mg＜0.03%, RE0.02-0.04%, the composition of core spheroidal graphite cast-iron is: C3.0-3.7%, Si2.0-2.6%, Mn0.5-0.8%, P≤0.2%, S≤0.03%, Mg 〉=0.02%, RE0.02-0.04%.
3, according to claim 1,2 described rolls, it is characterized in that chill depth poor＜5 millimeters, and roll lower end chill depth is more shallow than the upper end.
4, a kind of method of vertical centrifugal casting composite roll is characterized in that:
(1) the composition matching relationship by adjusting two-layer molten iron and composition and the tissue of controlling the recombination region are handled in the stokehold of working lining molten iron become different so that can relax the control range of casting process parameters, simplifies the operation, and obtains reliable metallurgical binding again,
Rotating speed when (2) filling out core by control and temperature are removed being mingled with and oxide-film on the body of roll working lining inner surface.
5, method according to claim 4 is characterized in that the carbon equivalent of working lining and core molten iron is approaching, and the working lining molten iron is done the stokehold with magnesium-rare earth or rare earth ferrosilicon alloy and handled.
6, method according to claim 4 is characterized in that:
(1) pouring temperature of working lining molten iron is above 170-230 ℃ of an eutectic temperature (Tc), and Tc is determined by general calculating, the gravity coefficient value (G during cast
Outward) be 60-90,
(2) the cast fixed thickness of working lining molten iron is constant, be generally 2 times of chill depth mean value, chill depth is finished to control blanking time of filling out core by working lining cast, adjusts can obtain to pour into a mould thickness this blanking time and subtract 10 millimeters with interior various chill depths
(3) working lining is poured into a mould to finish and was generally 1～5 minute to the blanking time of filling out core,
(4) pouring temperature of core molten iron is above 80～150 ℃ of a working lining molten iron eutectic temperature (Tc), about 1200～1280 ℃.Gravity coefficient value (G when filling out core
Outward) be 40-70.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86107631 CN1006861B (en) | 1986-10-30 | 1986-10-30 | A roller of centrifugal composite vanadium titanium cast iron and its casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86107631 CN1006861B (en) | 1986-10-30 | 1986-10-30 | A roller of centrifugal composite vanadium titanium cast iron and its casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86107631A true CN86107631A (en) | 1988-05-11 |
| CN1006861B CN1006861B (en) | 1990-02-21 |
Family
ID=4803622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86107631 Expired CN1006861B (en) | 1986-10-30 | 1986-10-30 | A roller of centrifugal composite vanadium titanium cast iron and its casting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1006861B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1037281C (en) * | 1993-02-27 | 1998-02-04 | 鞍山钢铁公司 | Composite cast iron roller and its casting method |
| CN100393438C (en) * | 2003-12-01 | 2008-06-11 | Sms迪马格股份公司 | Reel driving device comprising driving rolls provided with a cast envelope |
| CN102847906A (en) * | 2012-09-29 | 2013-01-02 | 芜湖新兴铸管有限责任公司 | High-quality centrifugal casting method for steel pipe blank |
| CN103273042A (en) * | 2013-05-24 | 2013-09-04 | 成都工业学院 | Method of preparing vanadium-titanium cemented-carbide drilling bit |
| CN103691903A (en) * | 2013-12-30 | 2014-04-02 | 唐山联强冶金轧辊有限公司 | Manufacturing process for centrifugal casting of multi-element eutectic high-alloy rolls |
| CN106881451A (en) * | 2016-12-29 | 2017-06-23 | 中钢集团邢台机械轧辊有限公司 | Hard alloy follows closely the manufacture method of roll-in roller |
| CN110508786A (en) * | 2019-09-24 | 2019-11-29 | 济南市白象科技发展有限公司 | A kind of composite roller |
| CN111545727A (en) * | 2020-04-26 | 2020-08-18 | 鞍钢重型机械有限责任公司 | Manufacturing method of hot-rolled pickled plate roller |
-
1986
- 1986-10-30 CN CN 86107631 patent/CN1006861B/en not_active Expired
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1037281C (en) * | 1993-02-27 | 1998-02-04 | 鞍山钢铁公司 | Composite cast iron roller and its casting method |
| CN100393438C (en) * | 2003-12-01 | 2008-06-11 | Sms迪马格股份公司 | Reel driving device comprising driving rolls provided with a cast envelope |
| CN102847906A (en) * | 2012-09-29 | 2013-01-02 | 芜湖新兴铸管有限责任公司 | High-quality centrifugal casting method for steel pipe blank |
| CN102847906B (en) * | 2012-09-29 | 2014-06-11 | 芜湖新兴铸管有限责任公司 | High-quality centrifugal casting method for steel pipe blank |
| CN103273042A (en) * | 2013-05-24 | 2013-09-04 | 成都工业学院 | Method of preparing vanadium-titanium cemented-carbide drilling bit |
| CN103691903A (en) * | 2013-12-30 | 2014-04-02 | 唐山联强冶金轧辊有限公司 | Manufacturing process for centrifugal casting of multi-element eutectic high-alloy rolls |
| CN106881451A (en) * | 2016-12-29 | 2017-06-23 | 中钢集团邢台机械轧辊有限公司 | Hard alloy follows closely the manufacture method of roll-in roller |
| CN110508786A (en) * | 2019-09-24 | 2019-11-29 | 济南市白象科技发展有限公司 | A kind of composite roller |
| CN111545727A (en) * | 2020-04-26 | 2020-08-18 | 鞍钢重型机械有限责任公司 | Manufacturing method of hot-rolled pickled plate roller |
| CN111545727B (en) * | 2020-04-26 | 2021-10-19 | 鞍钢重型机械有限责任公司 | Manufacturing method of hot-rolled pickled plate roller |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1006861B (en) | 1990-02-21 |
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