CN102847942B - Spray forming pouring method - Google Patents
Spray forming pouring method Download PDFInfo
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- CN102847942B CN102847942B CN201110180637.XA CN201110180637A CN102847942B CN 102847942 B CN102847942 B CN 102847942B CN 201110180637 A CN201110180637 A CN 201110180637A CN 102847942 B CN102847942 B CN 102847942B
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Abstract
The invention discloses a spray forming pouring method. A pouring pipe is arranged in a tundish and is provided with taper; the lower part of the pouring pipe is inserted into a drainage pipe; the pouring pipe is a refractory material piece; high-temperature molten steel is injected into the tundish and flows to the drainage pipe along the bottom of an inner cavity of the tundish; because the pouring pipe is inserted above the drainage pipe, the molten steel is accumulated in a cavity between the pouring pipe and the drainage pipe; initial stream of the molten steel is accumulated in the cavity and is preheated in the drainage pipe, and the initial molten steel is subjected to temperature compensation through the subsequent molten steel, so that the overall temperature of the molten steel is raised, the molten steel is accumulated, and the impact strength in the injection process is relieved; and therefore, steel slag generated by turbulence flow is mixed inside the tundish and upwards floats, after the liquid level height of the accumulated molten steel exceeds the pouring pipe, the molten steel uniformly flows into the pouring pipe through an orifice above the pouring pipe, is drained to the drainage pipe from the pouring pipe, and finally flows out of the drainage pipe.
Description
Technical field
The present invention relates to reaction-injection moulding field, particularly a kind of reaction-injection moulding method for pouring.
Background technology
Reaction-injection moulding is the new technology that a kind of method that adopts rapid solidification is prepared special material, and this technology is with the dual characteristics of nearly end form processing and semi-solid processing.The reaction-injection moulding the earliest Singer of Shi You Britain is taught and is proposed in the seventies, its principle is, with atomizer inner high voltage inert gas, the aluminium alloy stream flowing out through catheter in tundish is atomized into tiny molten drop, molten drop flies and by cooling gradually under the effect of high velocity air, before solidifying not yet completely, these molten drops deposited on the effigurate depositor of tool, by changing molten drop jet and the relative position of depositor and the forms of motion of depositor, can be coiled the difform semi-finished product blanks such as (post), pipe (ring), plate (band).
At present, in process of production, the technological process of reaction-injection moulding is: prepare mother metal, mother metal is placed in to smelting furnace; Open smelting furnace and the pre-thermoelectric generator of tundish; Until mother metal in smelting furnace all after fusing, thermometric sampling; Reach target temperature hypsokinesis peritectic furnace and pour molten steel into tundish; Molten steel in the tundish catheter of flowing through, is atomized in outlet; The molten steel drop that atomization forms splashes in rapid solidification on depositor; The continuous rotation of depositor makes to solidify drop accumulation and forms ingot blank.
In this operating process, it is a very important step that the opening of molten steel watered, if casting process is too fast or the degree of superheat is too small, the initial flow thigh temperature drop that very easily makes to pour into a mould molten steel is too fast and solidify catheter is inner.
The situation that solidification of molten steel obstruction catheter occurs generally has:
(1), in the sampling of molten steel thermometric and the initial process of injecting, often with splash, if the film of splash or drop fall into catheter position, thereby can solidify immediately, stop up catheter under suitable condition;
(2) another situation be exactly cast molten steel initial flow thigh amount less than normal, and the initial temperature of tundish preheating only has 1000 ℃ of left and right, now the preheat temperature of catheter is lower, initial flow thigh arrives in the process of catheter through tundish bottom like this, and temperature drop is very fast, meanwhile, the diameter of catheter is very little, only have several millimeters, and the resistance to material thermal conductivity adopting is very good, is very easy to make initial molten steel heat radiation too fast and occur in catheter and solidify;
(3) in addition, smelting furnace, in the process of fusing mother metal, inevitably can be entrained with field trash and scum silica frost in molten steel, if at when cast large-sized scum silica frost and field trash while preferentially entering catheter, be easy to occur to stop up the situation of catheter.
Summary of the invention
The object of the present invention is to provide a kind of reaction-injection moulding method for pouring, can effectively avoid the appearance of above-mentioned three kinds of fortuitous events, effectively improve reaction-injection moulding efficiency and can stablize molten steel initial flow thigh in cast moment, improve initial flow thigh temperature, further can utilize molten steel to carry out preheating to catheter, thereby reduce the generation that molten steel stops up catheter phenomenon, improve reaction-injection moulding efficiency.
For achieving the above object, technical scheme of the present invention is:
A reaction-injection moulding method for pouring is set up one and is opened depositing in tundish, and this opens depositing with tapering, and catheter is inserted in its underpart, and opening depositing is the part of resistance to material, high-temperature molten steel is flowed through to catheter along tundish intracavity bottom after injecting tundish, owing to opening depositing, insert catheter top, molten steel is accumulated in opening depositing and catheter and inlay the cavity of formation, molten steel initial flow thigh is accumulated catheter is carried out to preheating in cavity, follow-up molten steel carries out temperature-compensating to initial molten steel, make molten steel bulk temperature increase, molten steel has slowed down the impact strength of beam process in accumulation, make the slag volume that turbulent flow produces be mixed in the inner floating that occurs of tundish, when surpassing, opens after depositing the accumulation liquid level of molten steel, molten steel diffuses in to opening depositing inside uniformly by opening the top mouth of pipe surrounding of depositing, then from opening depositing, be guided to catheter, finally in catheter, flow out.
In opening the process of watering, superheat of liquid steel is: 50～80 ℃; Tundish preheat temperature: 800～1000 ℃; Open depositing preheat temperature: 300～700 ℃; Catheter preheat temperature: 100～300 ℃; Molten steel flow: 0.5～15kg/min.
The described depositing top internal diameter of opening is 10～70mm; Opening depositing bottom internal diameter is 10～50mm.
The described length of opening in depositing insertion catheter is 8～60mm; Opening depositing upper port is 3～50mm apart from the distance of tundish intracavity bottom.
The difference of the inventive method and traditional continuous casting method for pouring is:
First method for pouring of the present invention can improve its initial temperature for opening the catheter of depositing bottom, reduces catheter suffered thermal shock in opening the process of watering, thereby reduces the cracking rate of catheter, reduces the probability of bleed-out and nozzle scaling loss.
In method for pouring of the present invention, open depositing and be fixed on all the time in tundish, can effectively improve the temperature of initial molten steel stream thigh, avoid molten steel to solidify in catheter.
In method for pouring of the present invention, opening depositing is the part of resistance to material, and paper material in unconventional continuous casting, fusing can not occur and stops up catheter.
The major advantage of method for pouring of the present invention is:
1) can improve the temperature that enters catheter molten steel initial flow thigh.Compare direct beam molten steel to the method for catheter inside, described in the method, feature avoids occurring the molten steel initial flow thigh of low temperature, but molten steel initial flow thigh is accumulated above catheter, temperature-compensating by follow-up molten steel to initial molten steel, improved the temperature of whole molten steel, the pre-heat effect of simultaneously splitting depositing and catheter due to molten steel is dispelled the heat still less molten steel in the process of depositing and catheter of flowing through out.
2) can improve the preheat temperature of catheter.By the indirect heat transfer of tundish, the temperature of catheter can reach 100～350 ℃, and in the methods of the invention because accumulation molten steel heats catheter inwall in cavity, make after the accumulation of heat fully of catheter significantly to heat up, the temperature of catheter can reach more than 500 ℃.
3) can avoid thermometric and open and water the obstruction that initial stage molten steel splash is carried out falling into catheter.Owing to opening depositing, be embedded in catheter top, make to have formed buffering cavity above catheter, the molten steel drop of splash will fall among this cavity at first, and can directly not enter in catheter.
4), after cast is stable, can avoid occurring the mixed volume of slag phenomenon.The molten steel flow that is arranged so that of opening depositing changes, and the initial stage is turbulent flow, has formed the rising of stable liquid level after setting up liquid level above catheter, is conducive to the floating of scum silica frost, in casting process, can realize scum silica frost is left to last cast.
5) avoid occurring eccentric cast.Owing to opening the setting of depositing, make molten steel initial flow thigh flowing directly into catheter, not form eccentric cast, molten steel must just can flow into catheter along rear over opening the upper of depositing, owing to opening depositing, present certain taper, so molten steel stream covers out depositing along rear even inflow catheter from surrounding.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of one embodiment of the invention.
The specific embodiment
Referring to Fig. 1, embodiments of the invention 1.
The parameter following (lower same) of opening depositing:
A: molten steel initial flow thigh accumulation liquid level; B: insert after catheter, open the distance of depositing distance from bottom tundish intracavity bottom; D: open depositing bottom internal diameter; C: open depositing top internal diameter.
In the present embodiment, A:5mm, B:28mm, C:35mm, D:15mm.
The initial characteristic of molten steel and cast environment are controlled as follows:
Superheat of liquid steel is: 60 ℃; Tundish preheat temperature: 900 ℃; Open depositing preheat temperature: 500 ℃; Catheter preheat temperature: 200 ℃; Molten steel flow: 0.5～5kg/min.
Melted molten steel is poured into tundish 1 with the flow of 3kg/min, after 30 seconds, now the interior liquid level of tundish 1 reaches 2.5mm, reduces flow to 0.5kg/min, continue cast after 20 seconds, now the accumulation liquid level of tundish 1 interior molten steel reaches after 5mm, improves flow to 5kg/min, makes to accumulate molten steel and from opening depositing 2 surroundings, flows into fast, by catheter 3, flow out, the about 50s of this time remaining, after cast is stable, according to flow, 4kg is poured into end.
Embodiment 2
In the present embodiment, the parameter of opening depositing is as follows: A:10mm, B:29mm, C:38mm, D:18mm.
The initial characteristic of molten steel and cast environment are controlled as follows:
Superheat of liquid steel is: 70 ℃; Tundish preheat temperature: 950 ℃; Open depositing preheat temperature: 600 ℃; Catheter preheat temperature: 230 ℃; Molten steel flow: 1～8kg/min;
Melted molten steel is poured into tundish with the flow of 5kg/min, after 35 seconds, now in tundish, liquid level reaches 5mm, reduces flow to 1kg/min, continue cast after 25 seconds, now in tundish, the accumulation liquid level of molten steel reaches after 10mm, improves flow to 8kg/min, makes to accumulate molten steel and from opening depositing surrounding, flows into fast, by catheter, flow out, the about 50s of this time remaining, after cast is stable, according to flow, 3.5kg is poured into end.
Embodiment 3
In the present embodiment, the parameter of opening depositing is as follows: A:15mm, B:30mm, C:40mm, D:20mm.
The initial characteristic of molten steel and cast environment are controlled as follows:
Superheat of liquid steel is: 80 ℃; Tundish preheat temperature: 1000 ℃; Open depositing preheat temperature: 700 ℃; Catheter preheat temperature: 260 ℃; Molten steel flow: 2～10kg/min.
Melted molten steel is poured into tundish with the flow of 6kg/min, after 20 seconds, now in tundish, liquid level reaches 7.5mm, reduces flow to 2kg/min, continue cast after 30 seconds, now in tundish, the accumulation liquid level of molten steel reaches after 15mm, improves flow to 10kg/min, makes to accumulate molten steel and from opening depositing surrounding, flows into fast, by catheter, flow out, the about 35s of this time remaining, after cast is stable, according to flow, 3.8kg is poured into end.
Reaction-injection moulding is the preparation method of the 3rd metalloid material that grows up after and powder metallurgy process metallurgical continue casting.Spray forming technology is a kind of advanced material technology of preparing, and domestic and international many research institutions and enterprise drop into a large amount of human and material resources and research and develop this new technology, and obtain remarkable progress.Open that to water be the key link of whole spray deposition processing, the method can effectively improve the initial flow thigh temperature of molten steel, simultaneously can also preheating catheter, and steady flow, reduces the slag inclusion of opening the process of watering and stops up.
Claims (5)
1. a reaction-injection moulding method for pouring is set up one and is opened depositing in tundish, and this opens depositing with tapering, and catheter is inserted in its underpart, and opening depositing is the part of resistance to material, high-temperature molten steel is flowed through to catheter along tundish intracavity bottom after injecting tundish, owing to opening depositing, insert catheter top, molten steel is accumulated in opening depositing and catheter and inlay the cavity of formation, molten steel initial flow thigh is accumulated catheter is carried out to preheating in cavity, follow-up molten steel carries out temperature-compensating to initial molten steel, make molten steel bulk temperature increase, molten steel has slowed down the impact strength of beam process in accumulation, make the slag volume that turbulent flow produces be mixed in the inner floating that occurs of tundish, when surpassing, opens after depositing the accumulation liquid level of molten steel, molten steel diffuses in to opening depositing inside uniformly by opening the top mouth of pipe surrounding of depositing, then from opening depositing, be guided to catheter, finally in catheter, flow out.
2. reaction-injection moulding method for pouring as claimed in claim 1, is characterized in that, in opening the process of watering, superheat of liquid steel is: 50～80 ℃; Tundish preheat temperature: 800～1000 ℃; Open depositing preheat temperature: 300～700 ℃; Catheter preheat temperature: 100～300 ℃; Molten steel flow: 0.5～15kg/min.
3. reaction-injection moulding method for pouring as claimed in claim 1 or 2, is characterized in that, the described depositing top internal diameter of opening is 10～70mm; Opening depositing bottom internal diameter is 10～50mm.
4. reaction-injection moulding method for pouring as claimed in claim 1 or 2, is characterized in that, the described length of opening in depositing insertion catheter is 8～60mm; Opening depositing upper port is 3～50mm apart from the distance of tundish intracavity bottom.
5. reaction-injection moulding method for pouring as claimed in claim 3, is characterized in that, the described length of opening in depositing insertion catheter is 8～60mm; Opening depositing upper port is 3～50mm apart from the distance of tundish intracavity bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110180637.XA CN102847942B (en) | 2011-06-29 | 2011-06-29 | Spray forming pouring method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110180637.XA CN102847942B (en) | 2011-06-29 | 2011-06-29 | Spray forming pouring method |
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| CN102847942A CN102847942A (en) | 2013-01-02 |
| CN102847942B true CN102847942B (en) | 2014-10-29 |
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| CN112676773A (en) * | 2020-12-07 | 2021-04-20 | 天工爱和特钢有限公司 | Manufacturing process of powder metallurgy tundish nozzle flange free of steel sticking |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2048836A1 (en) * | 1990-10-22 | 1992-04-23 | Thomas F. Sawyer | Low flow rate nozzle and spray forming process |
| JP2684946B2 (en) * | 1993-01-12 | 1997-12-03 | 住友金属工業株式会社 | Tundish slag outflow prevention method |
| CN2579568Y (en) * | 2002-11-22 | 2003-10-15 | 中国科学院金属研究所 | Gas atomizing device for limiting scanning |
| CN101381790A (en) * | 2008-10-23 | 2009-03-11 | 衡阳华菱连轧管有限公司 | Method for horizontal continuous casting 10Cr9Mo1VNbN ferrite heat-resistant steel to tube round blank through electric stove smelting |
| CN101934370A (en) * | 2009-06-29 | 2011-01-05 | 宝山钢铁股份有限公司 | Process for preparing extra-thick or composite pipe blank by injection moulding and device thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56154269A (en) * | 1980-04-28 | 1981-11-28 | Kawasaki Steel Corp | Nozzle for pouring molten steel |
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2011
- 2011-06-29 CN CN201110180637.XA patent/CN102847942B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2048836A1 (en) * | 1990-10-22 | 1992-04-23 | Thomas F. Sawyer | Low flow rate nozzle and spray forming process |
| JP2684946B2 (en) * | 1993-01-12 | 1997-12-03 | 住友金属工業株式会社 | Tundish slag outflow prevention method |
| CN2579568Y (en) * | 2002-11-22 | 2003-10-15 | 中国科学院金属研究所 | Gas atomizing device for limiting scanning |
| CN101381790A (en) * | 2008-10-23 | 2009-03-11 | 衡阳华菱连轧管有限公司 | Method for horizontal continuous casting 10Cr9Mo1VNbN ferrite heat-resistant steel to tube round blank through electric stove smelting |
| CN101934370A (en) * | 2009-06-29 | 2011-01-05 | 宝山钢铁股份有限公司 | Process for preparing extra-thick or composite pipe blank by injection moulding and device thereof |
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