CN102554129A - Roll casting process and pouring device adopted by same - Google Patents
Roll casting process and pouring device adopted by same Download PDFInfo
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- CN102554129A CN102554129A CN201110441759XA CN201110441759A CN102554129A CN 102554129 A CN102554129 A CN 102554129A CN 201110441759X A CN201110441759X A CN 201110441759XA CN 201110441759 A CN201110441759 A CN 201110441759A CN 102554129 A CN102554129 A CN 102554129A
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Abstract
The invention discloses a roll casting process and a pouring device adopted by the same. First, the pouring device is manufactured, and then a proper amount of casting powder is packed and placed in a roll sand box in a suspended mode from a feeder head box. Pouring is performed, qualified molten steel is poured into a sprue gate sand box through a pouring cup so that molten steel is contacted with casting powder to enable the casting powder to melt, and a casting powder layer is respectively formed between a bottom roll neck sand box and the cold type inner wall surface and the melten steel. When the molten steel is close to a top roll neck sand box, a certain amount of casting powder is supplied from the feeder head box until pouring of rolls is achieved. The bottom roll neck sand box and the cold type inner wall adopted by the roll casting process do not hang sand. The casting powder layer formed by casting powder is adopted to protect the sand box so that labor intensity of workers is lowered and production efficiency is improved. After the box is opened, by using the bottom roll neck sand box and cold type waste heat, the box can be directly closed for casting next roll so that the roll casting process saves energy and is environment-friendly. In addition, one sprue gate sand box can be used for casting a plurality of small-diameter rolls, molten steel consumption is reduced, and yield is improved.
Description
Technical field
The present invention relates to casting technology field, especially a kind of casting technique and used pouring device that is used for static production steel rolling roll.
Background technology
The static steel rolling roll of producing of roll factory mainly contains two kinds of methods at present: top pouring method and bottom pouring method.The advantage of top pouring method is that simple, molten steel is beneficial to consecutive solidification, and still, its greatest problem is that scouring force is big, washes out casting mold easily owing to directly pour from the rising head end; Molten steel inward somersault under impact force action in the casting mold, the bits of molten steel surface, sand are easy to be brought into roll inside, cause roll slag inclusion, burning into sand defective; This method of while, the allowance that roll leaves during technological design is big, has both increased energy waste, has strengthened the machined workload again, and dimension uses under the situation that the top pouring method is generally only short in roll length, quality requirement is not too high.During the cast of bottom pouring method, molten steel is tangentially to get into roll neck under the roll, cold mould, go up roll neck, rising head through cup, sprue, cross gate, and molten steel rises is steady; Roll quality is good, and no matter big roller, pony roll can be produced, still; This method need increase running gate system; Especially both waste material when many rolls of Baogang water cast, because temperature reduces, the roll quality of casting is affected to the later stage; In addition, this technology, the inwall of following roll neck, cold mould will be hung one deck molding sand, leans on workman's compacting by hand entirely, and labour intensity is big, and production efficiency is low; After roll was unpacked, sandbox wanted cool to room temperature could use, and dries in the shade one day in the workshop after the moulding, advanced drying oven again and heated 8 hours, could pour into a mould, and one could use after overlapping frock 4～5 day at least again.
Summary of the invention
The technical problem that the present invention will solve is: overcome the deficiency in the prior art; A kind of roll casting technique and used pouring device are provided,, reduce labour intensity to enhance productivity; Energy savings casts out the roll foundry goods with higher inherent quality and better machining property.
The technical solution adopted for the present invention to solve the technical problems is: a kind of roll casting technique has following steps:
A, making apparatus for pouring; The down gate sandbox that will have cup places on the chassis; The sprue of down gate sandbox is communicated with the cross gate on chassis, around the down gate sandbox roll sandbox is set all around, will descend the roll neck sandbox to be placed on the chassis earlier; The cross gate on chassis is communicated with the aperture that following roll neck sandbox bottom is positioned at roll centerline feeding molten steel; Then plane on cold mould and the following roll neck sandbox is connected, last roll neck sandbox bottom is connected on the cold mould on the plane, at last plane on rising head case and the last roll neck sandbox is connected;
B, with after an amount of covering slag packing, hang in the roll sandbox from the rising head case, covering slag is positioned at the nearly time roll neck sandbox upper end of cold mould;
C, qualified molten steel is poured in the down gate sandbox through cup, molten steel gets into behind the cross gate through roll neck sandbox bottom aperture down and gets into down in the roll neck sandbox;
D, molten steel contact with covering slag and make the covering slag fusing; The covering slag of fusing covers molten steel surface; Liquid steel level rises, and liquid covering slag flows to the side, touches down roll neck sandbox and cold type inner wall surface; Receive the Quench after coagulation, between the inner wall surface of descending roll neck sandbox and cold mould and molten steel, form the layer of protecting slag blanket respectively;
E, molten steel continue to rise, near on during the roll neck sandbox, replenish a certain amount of covering slag from the rising head case, until the cast of accomplishing roll.
Specifically, the consumption of said covering slag is calculated as 1.2～1.4Kg/m by the roll inner surface area
2
The fusing point of said covering slag is 1250 ℃～1500 ℃.
Poring rate during cast is 600Kg/min～1200Kg/min, can choose according to the roll material difference.
Roll sandbox temperature is 50 ℃～90 ℃ during cast, and same roll when pouring into a mould at every turn roll sandbox temperature deviation in 20 ℃.
The used pouring device of a kind of above-mentioned casting technique; Comprise down gate sandbox that has cup and the chassis that is positioned at down gate sandbox bottom, the sprue of down gate sandbox is communicated with the cross gate on chassis, is provided with the roll sandbox around the down gate sandbox on the said chassis; The roll sandbox comprises following roll neck sandbox, cold mould, goes up roll neck sandbox and rising head case; Following roll neck sandbox is arranged on the chassis, and the plane is connected on cold mould and the following roll neck sandbox, and last roll neck sandbox bottom is connected on the cold mould on the plane; The plane is connected on rising head case and the last roll neck sandbox, and the cross gate on chassis is communicated with the aperture that following roll neck sandbox bottom is positioned at the roll centerline.
Preferably, described roll sandbox is provided with four around the down gate sandbox.
For guaranteeing the molten steel final set, produce flawless roll, described rising head chamber interior wall is provided with jacket.
The invention has the beneficial effects as follows: adopt above casting technique and casting device to carry out the Foundry Production of roll, have following advantage: 1, production efficiency improves, and under the same frock quantity, can produce 10% roll more.2, labor strength reduces, and owing to cold mould, following roll neck sandbox are not hung sand, can reduce workman's 2/3 workload.3, energy-saving and environmental protection, originally casting mold all will be dried, and both wastes energy, and causes environmental pollution again, and the waste heat behind this method utilization cast roll guarantees the frock temperature, need not heat again.4, the roll inherent quality improves, and internal organizational structure is fine and close, has machining property preferably; Roll working lining columnar grain is flourishing, has improved the roll wearability.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is the sectional structure sketch map of apparatus for pouring according to the invention.
Fig. 2 is the plan structure sketch map of apparatus for pouring according to the invention.
Fig. 3 is covering slag according to the invention placement location sketch map before cast.
The specific embodiment
Combine accompanying drawing and preferred embodiment that the present invention is further described now.These accompanying drawings are the sketch map of simplification, basic structure of the present invention only is described in a schematic way, so it only show the formation relevant with the present invention.
A kind of roll casting technique has following steps:
A, making apparatus for pouring; Like Fig. 1, shown in Figure 2, the down gate sandbox 1 that will have cup 8 places on the chassis 2, and the sprue 11 of down gate sandbox 1 is communicated with the cross gate 21 on chassis 2; Around down gate sandbox 1 four roll sandboxes are set all around; To descend roll neck sandbox 3 to be placed on the chassis 2 earlier, the cross gate 21 that makes chassis 2 and following roll neck sandbox 3 bottoms are positioned at the aperture 31 that the roll centerline feeds molten steel and are communicated with, and then plane on cold mould 4 and the following roll neck sandbox 3 are connected; Last roll neck sandbox 5 bottoms are connected on the cold mould 4 on the plane, at last plane on rising head case 6 and the last roll neck sandbox 5 are connected;
B, with after an amount of covering slag packing, hang in the roll sandbox from rising head case 6, covering slag is positioned at 4 near times roll neck sandbox 3 upper ends of cold mould, and is as shown in Figure 3.
C, qualified molten steel is poured in the down gate sandbox 1 through cup 8, molten steel gets into cross gate 21 backs and gets into down in the roll neck sandbox through roll neck sandbox 3 bottom apertures 31 down;
D, molten steel contact with covering slag and make the covering slag fusing; The covering slag of fusing covers molten steel surface; Liquid steel level rises, and liquid covering slag flows to the side, touches down roll neck sandbox 3 and cold mould 4 inner wall surface; Receive the Quench after coagulation, between the inner wall surface of descending roll neck sandbox 3 and cold mould 4 and molten steel, form the layer of protecting slag blanket respectively;
E, molten steel continue to rise, near on during roll neck sandbox 5, replenish a certain amount of covering slags from rising head case 6, until the cast of accomplishing roll.
The action principle of covering slag described in the said process is: when molten steel gets into roll neck sandbox 3, melt covering slag, covering slag swims in above the molten steel, and the protection molten steel does not contact with air, prevents molten steel oxidation.When liquid steel level rises, because molten steel is from getting into along the roll centerline direction, around the center liquid level is higher than; Around covering slag flowed to, liquid covering slag touched down roll neck sandbox 3 and cold mould 4 internal faces, receives Quench; Solidify rapidly, thereby between molten steel and above-mentioned inwall, form solid-state protection slag blanket, roll neck sandbox 3 and cold mould 4 do not receive molten steel scouring under the protection; After unpacking, the protection slag blanket is broken, and roller surface is very smooth.
Because the roll of producing varies, thereby the fusing point of covering slag is different, the too low covering slag of fusing point runs into cold type inner wall and can not solidify, and does not have protective effect, and fusing point is too high, can not melt, and does not also have protective effect.Can select reasonable fusing point covering slag according to material, the size of roll be to be related to the key that produce qualified roll, and the fusing point of comparatively ideal covering slag is 1250 ℃～1500 ℃.
The covering slag consumption is to guarantee one of key point that casts out by the high-quality roll, varies in size according to roll, confirms rational covering slag consumption, has lacked not have protective effect, and many several wastes also can cause casting flaws such as slag inclusion.General consumption is calculated as 1.2～1.4Kg/m by the roll inner surface area
2Preferable.
The control of the temperature of roll sandbox also is a key point during cast, and the suitable temperature of roll sandbox guarantees to produce qualified roll when having only the cast of confirming.Roll sandbox temperature is controlled between 50 ℃～90 ℃ during comparatively ideal cast, the roll capping that diameter is less, and the roll that diameter is bigger takes off limit, and the roll sandbox temperature deviation of same roll when at every turn pouring into a mould should be in 20 ℃.
Also have, cast out high-quality roll, poring rate control also is one of key point, and poring rate is too fast; Covering slag can not form uniform protection slag blanket, does not have protective effect, and poring rate is too slow, and the covering slag layer thickness of formation is little; Also do not have protective effect, generally speaking poring rate and roll material also have relation, and the poring rate that unlike material requires is different; Usually with the phosphorus content of steel as selecting foundation, when containing 0.5%C, poring rate is 1200kg/min; When containing 1.0%C, poring rate is 1000kg/min; When containing 1.5%C, poring rate is 800kg/min; When containing 2.0%C, poring rate is 600kg/min, and from finding out, phosphorus content is high more, and poring rate is just slow more.
Like Fig. 1, the used pouring device of a kind of above-mentioned casting technique shown in Figure 2, comprise that the upper end has the down gate sandbox 1 and the chassis 2 that is positioned at down gate sandbox 1 bottom of cup 8, is provided with four roll sandboxes around down gate sandbox 1 on the said chassis 2; This roll sandbox comprises following roll neck sandbox 3, cold mould 4, goes up roll neck sandbox 5 and rising head case 6; Wherein, down gate sandbox 1: the sprue 11 that inside has refractory brick tube to form, chassis 2: have the cross gate of laying with refractory brick tube 21; Following roll neck sandbox 3: hot investment casting one-tenth and roll require approaching interior hole shape; To reduce allowance, cold mould 4: for forming the mould of roll barrel part, last roll neck sandbox 5: the inner die cavity of forming by self-hardening sand; Rising head case 6: inwall is provided with jacket 7, guarantees the roll consecutive solidification.Described sprue 11 is communicated with described cross gate 21.
Described roll neck sandbox 3 down is arranged on the chassis 2; The plane is connected on cold mould 4 and the following roll neck sandbox 3; Last roll neck sandbox 5 bottoms are connected on the cold mould 4 on the plane; The plane is connected on rising head case 6 and the last roll neck sandbox 5, and the cross gate 21 on chassis 2 is communicated with the aperture 31 that following roll neck sandbox 3 bottoms are positioned at the roll centerline, in guaranteeing that molten steel gets into down roll neck sandbox 3 along the roll centerline direction of being cast.
Above-mentioned cold mould 4 and down roll neck sandbox 3 wall thickness confirm: wall thickness is too big or too little, not only influences roll quality, also can influence the sandbox life-span, generally confirms the cold mould 4 and the wall thickness of roll neck sandbox 3 down by following formula, to guarantee to produce qualified roll.
Cold mould cross-sectional area/roll cross-sectional area=1.25～1.50
I.e. (D
2-d
2)/d
2=1.25～1.50
D＝(1.5～1.58)d
Here D: cold mould outside diameter d: cold mould internal diameter, approximate roll blank external diameter.
The course of work of the present invention is following: qualified molten steel pours in the down gate sandbox 1 through cup 8; Get into cross gate 21 then, through in the roll neck sandbox 3 under roll neck sandbox 3 bottom apertures 31 get into down, the covering slag of some is arranged in the sandbox again; After molten steel gets into following roll neck sandbox 3; Melt covering slag, the nature of glass covering slag of fusing covers molten steel surface, and the protection molten steel is not oxidized.Simultaneously, liquid steel level rises, and liquid covering slag flows to the side, touches down roll neck sandbox 3 or cold mould 4 internal faces; Receive Quench, solidify very soon, between above-mentioned internal face and molten steel, form the vitreous protection slag blanket of one deck, this protection slag blanket can prolong the service life of sandbox (cold mould); Also can make roller surface bright and clean, after unpacking, vitreous protection slag blanket is broken naturally; Roller surface is bright and clean, tool wear when having reduced machined, molten steel rises on during roll neck sandbox 5; Because there is molding sand inside, guarantee that the top roll neck portion of roll is slower than body of roll partial coagulation, be beneficial to feeding; Rising head case 6 inwalls are provided with jacket 7, guarantee the molten steel final set, produce flawless roll.
Used following roll neck sandbox 3, cold mould 4 inwalls of the present invention are not hung sand; Protection slag blanket with covering slag forms is protected sandbox; Alleviated labor strength, improved production efficiency, the waste heat that the back of unpacking utilizes roll neck sandbox 3, cold mould 4 down directly the mould assembling casting next prop up roll; Both energy savings was protected environment again.Particularly when producing little roll, can use a down gate sandbox 1 casting multi-branch roll, reduce molten steel consumption, improve recovery rate.
The foregoing description only is explanation technical conceive of the present invention and characteristics; Its purpose is to let the personage that is familiar with this technology can understand content of the present invention and implements; Can not limit protection scope of the present invention with this; All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed in protection scope of the present invention.
Claims (8)
1. roll casting technique; It is characterized in that: have following steps: a, making apparatus for pouring; The down gate sandbox (1) that will have cup (8) places on the chassis (2); The sprue (11) of down gate sandbox (1) is communicated with the cross gate (21) of chassis (2), around down gate sandbox (1) the roll sandbox is set all around, will descend roll neck sandbox (3) to be placed on the chassis (2) earlier; The cross gate (21) of chassis (2) is communicated with the aperture (31) that following roll neck sandbox (3) bottom is positioned at roll centerline feeding molten steel; Then cold mould (4) and following roll neck sandbox (3) are gone up the plane and be connected, last roll neck sandbox (5) bottom is connected cold mould (4) and goes up on the plane, at last rising head case (6) and last roll neck sandbox (5) is gone up the plane and is connected; B, with after an amount of covering slag packing, hang in the roll sandbox from rising head case (6), covering slag is positioned at nearly time roll neck sandbox (3) upper end of cold mould (4); C, qualified molten steel is poured in the down gate sandbox (1) through cup (8), molten steel gets into cross gate (11) back and gets into down in the roll neck sandbox (3) through roll neck sandbox (3) bottom aperture (31) down; D, molten steel contact with covering slag and make the covering slag fusing; The covering slag of fusing covers molten steel surface; Liquid steel level rises, and liquid covering slag flows to the side, touches down roll neck sandbox (3) and cold mould (4) inner wall surface; Receive the Quench after coagulation, between the inner wall surface of descending roll neck sandbox (3) and cold mould (4) and molten steel, form the layer of protecting slag blanket respectively; E, molten steel continue to rise, near on during roll neck sandbox (5), replenish a certain amount of covering slag from rising head case (6), until the cast of accomplishing roll.
2. according to the said roll casting technique of claim 1, it is characterized in that: the consumption of said covering slag is calculated as 1.2～1.4Kg/m by the roll inner surface area
2
3. according to the said roll casting technique of claim 1, it is characterized in that: the fusing point of said covering slag is 1250 ℃～1500 ℃.
4. according to the said roll casting technique of claim 1, it is characterized in that: the poring rate during cast is 600Kg/min～1200Kg/min.
5. according to the said roll casting technique of claim 1, it is characterized in that: roll sandbox temperature is 50 ℃～90 ℃ during cast, and same roll when pouring into a mould at every turn roll sandbox temperature deviation in 20 ℃.
6. pouring device that is used for the said casting technique of claim 1; Comprise the down gate sandbox (1) that has cup (8) and be positioned at the chassis (2) of down gate sandbox (1) bottom; The sprue (11) of down gate sandbox (1) is communicated with the cross gate (21) of chassis (2); It is characterized in that: said chassis (2) are last to be provided with the roll sandbox around down gate sandbox (1), and the roll sandbox comprises roll neck sandbox (3), cold mould (4), last roll neck sandbox (5) and rising head case (6) down, and following roll neck sandbox (3) is arranged on the chassis (2); Cold mould (4) goes up the plane with following roll neck sandbox (3) and is connected; Last roll neck sandbox (5) bottom is connected to cold mould (4) and goes up on the plane, and rising head case (6) is gone up the plane with last roll neck sandbox (5) and is connected, and the cross gate (21) of chassis (2) is communicated with the aperture (31) that following roll neck sandbox (3) bottom is positioned at the roll centerline.
7. pouring device according to claim 6 is characterized in that: described roll sandbox is provided with four around down gate sandbox (1).
8. pouring device according to claim 6 is characterized in that: described rising head case (6) inwall is provided with jacket (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110441759XA CN102554129A (en) | 2011-12-26 | 2011-12-26 | Roll casting process and pouring device adopted by same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110441759XA CN102554129A (en) | 2011-12-26 | 2011-12-26 | Roll casting process and pouring device adopted by same |
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| CN102554129A true CN102554129A (en) | 2012-07-11 |
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| CN201110441759XA Pending CN102554129A (en) | 2011-12-26 | 2011-12-26 | Roll casting process and pouring device adopted by same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974765A (en) * | 2012-11-27 | 2013-03-20 | 北京交通大学 | Casting mould without riser of roller blank and casting method thereof |
| CN103302250A (en) * | 2013-06-25 | 2013-09-18 | 常州凯达重工科技有限公司 | Edging roll mould and process for producing edging roll by adopting edging roll mould |
| CN110904380A (en) * | 2019-12-04 | 2020-03-24 | 河北津西钢铁集团重工科技有限公司 | High-hardness nodular cast iron roller sheet and casting method thereof |
| CN112108613A (en) * | 2019-06-20 | 2020-12-22 | 常州凯达重工科技有限公司 | Design method of roller static pouring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974765A (en) * | 2012-11-27 | 2013-03-20 | 北京交通大学 | Casting mould without riser of roller blank and casting method thereof |
| CN102974765B (en) * | 2012-11-27 | 2014-09-03 | 北京交通大学 | Casting mould without riser of roller blank and casting method thereof |
| CN103302250A (en) * | 2013-06-25 | 2013-09-18 | 常州凯达重工科技有限公司 | Edging roll mould and process for producing edging roll by adopting edging roll mould |
| CN103302250B (en) * | 2013-06-25 | 2015-07-01 | 常州凯达重工科技有限公司 | Edging roll mould and process for producing edging roll by adopting edging roll mould |
| CN112108613A (en) * | 2019-06-20 | 2020-12-22 | 常州凯达重工科技有限公司 | Design method of roller static pouring device |
| CN110904380A (en) * | 2019-12-04 | 2020-03-24 | 河北津西钢铁集团重工科技有限公司 | High-hardness nodular cast iron roller sheet and casting method thereof |
| CN110904380B (en) * | 2019-12-04 | 2021-06-08 | 河北津西钢铁集团重工科技有限公司 | High-hardness nodular cast iron roller sheet and casting method thereof |
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Application publication date: 20120711 |