CN102350485A - Device and process for repairing shrinkage holes during steel billet casting through intermediate-frequency electric heating - Google Patents
Device and process for repairing shrinkage holes during steel billet casting through intermediate-frequency electric heating Download PDFInfo
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- CN102350485A CN102350485A CN2011102926650A CN201110292665A CN102350485A CN 102350485 A CN102350485 A CN 102350485A CN 2011102926650 A CN2011102926650 A CN 2011102926650A CN 201110292665 A CN201110292665 A CN 201110292665A CN 102350485 A CN102350485 A CN 102350485A
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Abstract
The invention discloses a device and a process for repairing shrinkage holes during steel billet casting through intermediate-frequency electric heating, and the device and the process are used for shrinkage repairing during steel billet casting. In the device, a casting feeder head is formed on the upper part of a steel mould, an intermediate-frequency induction heating power distribution cabinet is connected with an induction heating coil, cooling fluid inside the induction heating coil is communicated with a cooling source, and the induction heating coil is sleeved outside the feeder head, wherein the feeder head is formed by pressing a mixture of quartz sand and sodium silicate; and the process comprises the steps of: casting by controlling the temperature of a furnace to be 1500-1600 DEG C, sleeving the induction heating coil into the feeder head timely after molten steel is fully filled, continuing heating, maintaining the temperature within 1500-1600 DEG C for 8-10min, gradually reducing the current, and reducing the temperature of the molten steel in the feeder head at the rate of 100-120 DEG C per minute till the molten steel is solidified. According to the device and the process disclosed by the invention, the cooling speed of the feeder head can be effectively reduced, the time for isolating the motel steel from the outside can be prolonged, so that slag and gases in the molten steel can be removed timely to the outside, thus, the shrinkage holes, slag holes and gas holes of a steel billet can be completely eliminated, an optimal crystallization state can be reached, the shrinkage rate of the feeder head is reduced, and the product qualified rate can be greatly increased.
Description
Technical field
The present invention relates to the steel embryo and smelt the placing field, is the device in the big shaped steel embryo casting of a kind of intermediate frequency electrical heating feeding hole specifically, and installs the process in feeding hole with this.
Background technology
In the smelting casting process of the existing particularly big-and-middle shaped steel embryo of steel embryo, normally will melt molten molten steel and flow in the steel mold cavity through rising head earlier, after cooling and demolding, form the steel embryo again.Molten steel in steel mold cavity in the condensation process volume can take place three times and shrink; Promptly for the first time be that alloy liquid is called liquid the contraction from the temperature that pouring temperature is cooled to begin to solidify; For the second time being to be cooled to the temperature that molten metal all solidifies from the temperature that begins to solidify to be called solidification shrinkage, is to be called Solid State Contraction from the temperature cool to room temperature that all solidifies for the third time; And the contraction of molten steel size is relevant with steel embryo size, every reduction by 100 degree of molten steel, and volume all shrinks 0.78-1.2%, so pouring temperature is high more, and liquid contraction is big more.Alloying element in the molten steel is different in addition, and shrinkage factor is also different, and is big more like manganese, sulfur content, shrinks also greatly more, like carbon, silicone content height, shrinks little.Owing to the reason of expanding with heat and contract with cold; After molten steel gets into die cavity; Molten metal rapid heat dissipation near the type wall; Cooling velocity is then solidified to the punching block center soon one by one; The steel embryo is in cooling procedure; Can obtain replenishing of the liquid metal in the rising head in the casting ladle during general liquid the contraction, the contraction in this stage is little to the influence of steel idioplasm amount.Solid State Contraction is also little to formation shrinkage cavity, shrinkage defect influence.If but when solidification shrinkage, can not get replenishing timely, will be inner like temperature the highest center formation shrinkage cavity and shrinkage defect in the steel embryonic center, cause the inferior percent defective of steel embryo to reach more than 30%.The place that shrinkage cavity, shrinkage defect produce in the steel embryo is to occur in steel embryonic center position, because the heat radiation of these local molten metals is the slowest, and final set and form defective; Another place is the rising head lower portion, because cooling velocity is fast here, steel embryo internal gas, slag can not get getting rid of, and molten metal is isolated from the outside, and has really solidified the rising head top, forms defective at last, has reduced the feeding efficiency of rising head.Shrinkage cavity, shrinkage defect mostly occur inner at the steel embryo, and very similar, endanger all very big.So high inferior percent defective is not only wasted a large amount of resources and the energy; Also have a strong impact on the business efficiency of enterprise; Being to perplex the bottleneck that steel embryo manufacturing enterprise further increases economic efficiency for a long time, also is that people want to solve and unsolved a great problem for a long time.
Be to solve steel embryo shrinkage cavity and shrinkage defect, manufacturing industry mainly taked to increase rising head diameter and height in the past, and changed the exothermic riser exothermic material and replenish method damaged in the die cavity, but DeGrain.Its reason is: rising head is in the die cavity the top, wall thickness, and cooling rate is fast, and crystallization rate makes gas, the impurity at punching block center can not get discharging greater than die cavity center crystallization rate; And rising head liquid is limit because of being subjected to extraneous factor, and bright emitting is exposed to air set, impels riser metal liquid to be isolated from the outside, and has reduced the contraction efficient of rising head, causes all to have shrinkage cavity and shrinkage porosite phenomenon in most of steel embryo, and product percent of pass is very low.
Summary of the invention
For overcoming the deficiency of prior art, goal of the invention of the present invention is to provide a kind of intermediate frequency electrical heating steel embryo casting feeding aperture apparatus and technology, to avoid forming the purpose of shrinkage cavity and shrinkage defect in the smelting casting process that is implemented in big-and-middle shaped steel embryo fully.
For realizing above-mentioned purpose; Casting pressing port is equipped with on the top of punching block of the present invention; It is characterized in that: the Frequency Induction Heating power distribution cabinet is connected with induction heating circle through capacitor; Cooling fluid in the induction heating circle communicates with cooling source; Induction heating circle is sleeved on outside the casting pressing port, and said casting pressing port is for mixing the composite structured of bubble flower alkali compacting with 30 orders-50 order quartz sand;
Described intermediate frequency electrical heating steel embryo casting feeding hole technology is characterized in that:
(a) earlier be that 1500 ℃-1600 ℃ molten steel pours in the steel mold cavity from rising head, and make molten steel (4) go up liquid level to rising head upper end temperature;
(b) induction heating circle is linked on the rising head outer wall, and heating makes in the rising head liquid steel temperature remain 1500 ℃-1600 ℃, 8-10 minute, molten steel all replenishes and gets in the steel mold cavity to the rising head again;
(c) make molten steel cooling in the rising head by the speed of 100 ℃-120 ℃ of per minute coolings then, up to solidifying;
(d) finally demould obtains not having the steel embryo of shrinkage cavity and shrinkage defect.
The rising head that the rising head that the present invention owing to be provided with on steel model top is mixed and made into by quartz sand and bubble flower alkali and cast gate are unified; And outfit Medium Frequency Induction Heating Furnace; Make the induction heating circle and the rising head outer wall fit of Medium Frequency Induction Heating Furnace; Thereby when the molten steel that with temperature is 1500 ℃-1600 ℃ pours in the steel mold cavity and waters full rising head; In time induction heating circle is enclosed within on the outer wall of rising head; Heating makes the interior liquid steel temperature of rising head remain 1500 ℃-1600 ℃; The molten steel that is in liquid condition is so slowly constantly mended in the steel mold cavity; About 8-10 minute; Molten steel all replenishes and gets in the steel mold cavity in the rising head; Progressively reduce electric current then; Make of the speed cooling of the interior liquid steel temperature of rising head by 100 ℃-120 ℃ of per minutes; Up to solidifying; Played slow feeding effect by this method; Make the slag in the molten steel; Gas discharges if having time; Make the shrinkage cavity of steel embryo; Cinder hole; Pore is able to thorough solution; Make the steel embryo by perlitic transformation to cementite; Austenite; Reach best crystalline state, make product percent of pass reach 100%.
The present invention compared with prior art; Can effectively reduce the cooling velocity of casting pressing port; Prolonging molten steel is isolated from the outside the time; Slag, gas in the molten steel are in time outwards got rid of; The shrinkage cavity of steel embryo, cinder hole, pore are able to thorough solution, make the steel embryo by perlitic transformation to cementite, austenite, reach best crystalline state; Reduced the contraction efficient of rising head, product percent of pass is greatly improved.
Description of drawings
Accompanying drawing is a structural representation sketch of the present invention.
The specific embodiment
Shown in accompanying drawing; Casting pressing port 2 is equipped with on the top of punching block 5; Frequency Induction Heating power distribution cabinet 1 is connected with induction heating circle 3 through capacitor; Frequency Induction Heating power distribution cabinet 1 provides heating power supply for induction heating circle 3; Frequency Induction Heating power distribution cabinet 1 adopts the Medium Frequency Induction Heating Furnace control of 160KW; Cooling fluid in the induction heating circle 3 communicates with cooling source 6; Through advance, return water system reduces the temperature in the induction heating circle 3, casting pressing port 2 is for mixing composite structured that bubble flower alkali suppresses with 30 orders, 40 orders or 50 purpose quartz sands.
Control for Kiln Temperature is begun casting between 1500 ℃-1600 ℃; After molten steel is filled with; Molten steel 4 at casting pressing port 2 is under the liquid condition situation; Induction heating circle 3 is inserted in casting pressing port 2 continues heating; Temperature remains on 1500 ℃-1600 ℃; Make molten steel in 8-10 minute, be in liquid condition; Slowly add to the die cavity center of punching block 5; To the last replenish and finish; Make the slag in its molten steel 4; Gas is in time outwards got rid of; Progressively reduce electric current then, make the speed cooling of the interior liquid steel temperature of rising head by 100 ℃-120 ℃ of per minutes, the molten steel 4 of steel rising head 2 slowly solidifies; Until crystallization at 2 one-tenth solids of casting pressing port; Make the shrinkage cavity of steel embryo; Cinder hole; Pore is able to thorough solution, make the steel embryo by perlitic transformation to cementite; Austenite reaches best crystalline state.Played effective feeding effect through this process.
Claims (3)
1. an intermediate frequency electrical heating steel embryo is cast the feeding aperture apparatus; Casting pressing port (2) is equipped with on the top of punching block (5); It is characterized in that: Frequency Induction Heating power distribution cabinet (1) is connected with induction heating circle (3) through capacitor; Cooling fluid in the induction heating circle (3) communicates with cooling source (6), and induction heating circle (3) is sleeved on outside the casting pressing port (2).
2. intermediate frequency electrical heating steel embryo casting feeding aperture apparatus according to claim 1 is characterized in that: said casting pressing port (2) is for mixing the composite structured of bubble flower alkali compacting with 30 orders-50 order quartz sand.
3. the described intermediate frequency electrical heating of claim 1 a steel embryo is cast feeding hole technology, it is characterized in that: press following process feeding hole:
(a) earlier be that 1500 ℃-1600 ℃ molten steel pours in punching block (5) die cavity from rising head (2), and make molten steel (4) go up liquid level to rising head (2) upper end temperature;
(b) again induction heating circle (3) is linked on rising head (2) outer wall, and heating makes interior the molten steel of rising head (2) (4) temperature remain 1500 ℃-1600 ℃, 8-10 minute, to all additional entering punching block (5) of interior the molten steel of rising head (2) (4) die cavities;
(c) by the speed of 100 ℃-120 ℃ of per minute coolings interior the molten steel of rising head (2) (4) is lowered the temperature then, up to solidifying;
(d) finally demould obtains not having the steel embryo of shrinkage cavity and shrinkage defect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102926650A CN102350485A (en) | 2011-10-05 | 2011-10-05 | Device and process for repairing shrinkage holes during steel billet casting through intermediate-frequency electric heating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102926650A CN102350485A (en) | 2011-10-05 | 2011-10-05 | Device and process for repairing shrinkage holes during steel billet casting through intermediate-frequency electric heating |
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| CN102350485A true CN102350485A (en) | 2012-02-15 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521718A (en) * | 2013-09-23 | 2014-01-22 | 唐山联强冶金轧辊有限公司 | Medium and large casting roller ramming mould heating and feeding method and device |
| WO2014177052A1 (en) * | 2013-05-03 | 2014-11-06 | 燕山大学 | Induction heating and electromagnetic stirring device for riser head of steel ingot |
| CN106734932A (en) * | 2016-12-30 | 2017-05-31 | 大连船用推进器有限公司 | Large-scale marine propeller casts rising head induction heating apparatus |
| CN114147181A (en) * | 2021-10-21 | 2022-03-08 | 浙江林家昌隆阀门铸造有限公司 | Double-furnace casting method |
-
2011
- 2011-10-05 CN CN2011102926650A patent/CN102350485A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014177052A1 (en) * | 2013-05-03 | 2014-11-06 | 燕山大学 | Induction heating and electromagnetic stirring device for riser head of steel ingot |
| CN103521718A (en) * | 2013-09-23 | 2014-01-22 | 唐山联强冶金轧辊有限公司 | Medium and large casting roller ramming mould heating and feeding method and device |
| CN103521718B (en) * | 2013-09-23 | 2015-04-01 | 唐山联强冶金轧辊有限公司 | Medium and large casting roller ramming mould heating and feeding method and device |
| CN106734932A (en) * | 2016-12-30 | 2017-05-31 | 大连船用推进器有限公司 | Large-scale marine propeller casts rising head induction heating apparatus |
| CN114147181A (en) * | 2021-10-21 | 2022-03-08 | 浙江林家昌隆阀门铸造有限公司 | Double-furnace casting method |
| CN114147181B (en) * | 2021-10-21 | 2023-12-29 | 浙江林家昌隆阀门铸造有限公司 | Double-furnace casting method |
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Application publication date: 20120215 |