CN101185966B - Large-scale steel casting production technology and slowly cooling device thereof - Google Patents
Large-scale steel casting production technology and slowly cooling device thereof Download PDFInfo
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- CN101185966B CN101185966B CN2007102033828A CN200710203382A CN101185966B CN 101185966 B CN101185966 B CN 101185966B CN 2007102033828 A CN2007102033828 A CN 2007102033828A CN 200710203382 A CN200710203382 A CN 200710203382A CN 101185966 B CN101185966 B CN 101185966B
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- 238000005266 casting Methods 0.000 title claims abstract description 58
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 10
- 239000010959 steel Substances 0.000 title claims abstract description 10
- 238000005516 engineering process Methods 0.000 title claims description 15
- 238000001816 cooling Methods 0.000 title abstract description 17
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 238000000137 annealing Methods 0.000 claims description 21
- 238000010583 slow cooling Methods 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000011534 incubation Methods 0.000 claims description 3
- 229910001208 Crucible steel Inorganic materials 0.000 abstract description 9
- 244000035744 Hura crepitans Species 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 6
- 239000004576 sand Substances 0.000 abstract description 6
- 229910000851 Alloy steel Inorganic materials 0.000 abstract description 4
- 229910000975 Carbon steel Inorganic materials 0.000 abstract description 2
- 239000010962 carbon steel Substances 0.000 abstract description 2
- 238000004321 preservation Methods 0.000 abstract 3
- 239000007788 liquid Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000009933 burial Methods 0.000 description 5
- 241000196324 Embryophyta Species 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 101150054854 POU1F1 gene Proteins 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007528 sand casting Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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Abstract
The invention discloses a big-size cast steel part manufacturing process, relating to the casting field of big-size cast steel part. The process includes the following steps: forming, casting, heat preservation, shaking-out, shaking and cleaning. In the heat preservation process, when the temperature of cast steel piece (7) is cooled to 750 to 850 DEG C and the shaking out is carried out, and then gradual cooling is carried out; the cast steel piece (7) is put into a pre-heated gradual-cooling device to be cooled to be under 300 DEG C with temperature-falling speed of 10 to 20 DEG C per hour, and then latter procedures such as the shaking, etc. are done. The invention also discloses one gradual cooling device used for the process. The gradual device is made of heat preservation materials and forms sealed space around the cast steel piece (7). The invention largely shortens the time which the cast steel part spends in occupying sand box, accessories and ground pits, etc., and can guarantee the quality and enhance the production efficiency of the big-size cast steel part. The invention is mainly applied to big-size cast steel pieces with more than 10-ton steel liquid used for resin-sand forming such as carbon steel, low-alloy steel and high-alloy steel, etc.
Description
Technical field
The present invention relates to the sand casting field, the shake out technology of especially a kind of molten steel amount after the carbon steel more than 10 tons, low-alloy steel, the cast of high-alloy steel class large-scale steel-casting.
Background technology
At present, traditional cast steel production technology may further comprise the steps: moulding, cast, insulation, shake out, knockout, cleaning.Wherein steel-casting shake out technology is after must in sand mold, slowly being as cold as low-temperature condition after the steel-casting cast, is generally carrying out shake out about 300 ℃ even under the lower temperature, promptly in sandbox, is incubated slow cooling, to prevent problems such as steel-casting cracks, distortion.Adopt resin sand technology, with sandbox, melt pit, when the cored-up mould mode is produced steel-casting, because the cooling velocity of steel-casting in the resin sand sand mold is slower; Temperature drop is generally 1～10 ℃/h, cause steel-casting from cast, be incubated can shake out this section period very long, large-scale steel-casting particularly; Its shake out time will be longer; This will reduce moulding with sandbox, attach, the turnover utilization rate of melt pit, prolong the holding time in steel-casting cast, insulation place, directly reduce production efficiency.
Summary of the invention
Cause the not high problem of production efficiency in order to overcome existing large-scale steel-casting cast back because of insulation slow cooling overlong time in sand mold, technical problem to be solved by this invention provides a kind of large-scale steel casting production technology and the annealing device thereof that can when guaranteeing castability, boost productivity.
The technical solution adopted for the present invention to solve the technical problems is: large-scale steel casting production technology; May further comprise the steps: moulding, cast, insulation, shake out, knockout, cleaning; In incubation step when the steel-casting temperature is cooled to 750～850 ℃ shake out; Carry out the slow cooling step then: steel-casting is put into the annealing device that is preheating to 500～600 ℃ and be cooled to below 300 ℃, change subsequent handlings such as knockout again over to the temperature drop speed of 10～20 ℃/h.
The present invention also provides a kind of annealing device that is used for large-scale steel casting production technology of the present invention, and annealing device is processed by insulation material, but and at the peripheral confined space that forms of steel-casting.
The invention has the beneficial effects as follows: after the steel-casting cast; Utilize resin sand to be heated and be prone to defeated and dispersed characteristic; When steel-casting still is in the condition of high temperature, just accomplish the shake out operation of steel-casting, and the steel-casting that still is in the condition of high temperature behind the shake out is placed implementation control cooling in the insulation annealing device of setting up, shifted to an earlier date the shake out time of foundry goods; The holding time that reduced sandbox, cast melt pit, attaches etc., thus casting production efficiency improved.Use technology of the present invention, can shorten the time 60～80% of large-scale steel-casting,, also can shorten the time 30～50% of large-scale steel-casting simultaneously, and can guarantee the steel-casting quality from being poured into knockout because the cooling of steel-casting is accelerated from being poured into shake out.
Description of drawings
Fig. 1 is a process chart of the present invention,
Fig. 2 is a burial pit cutaway view of the present invention.
Be labeled as among the figure, the 1-burial pit, the 2-heating plant, the 3-air inlet, the 4-return air inlet, the 5-temperature measuring equipment, the 6-base, the 7-steel-casting, 8-hangs handle, the 9-removable cover.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is further specified.
Large-scale steel casting production technology of the present invention; May further comprise the steps: moulding, cast, insulation, shake out, knockout, cleaning; In incubation step when steel-casting 7 temperature are cooled to 750～850 ℃ shake out; Carry out the slow cooling step then: steel-casting 7 is put into the annealing device that is preheating to 500～600 ℃ and be cooled to below 300 ℃, change subsequent handlings such as knockout again over to the temperature drop speed of 10～20 ℃/h.
As shown in Figure 1; Large-scale steel-casting hot shake-out technology of the present invention; In existing processes, having set up the slow cooling step, is 750～850 ℃ also promptly during 800 ℃ of left and right sides in the steel-casting temperature, promptly steel-casting 7 is implemented the shake outs operation; And the steel-casting behind the shake out 7 is transported in the annealing device of preheating immediately, be cooled to below 300 ℃ with the speed of 10～20 ℃/h.For the steel-casting 7 of different steel grades, its shakeout temperature should be done suitably adjustment according to the initial temperature of its actual generation structural transformation.
The preheat temperature of said annealing device before steel-casting 7 is put into is 500～600 ℃, and steel-casting 7 can not cracked because of sharply cooling off when getting into this device.
Behind hot shake-out, in time transport steel-casting 7 quickly and easily for convenient, during the steel-casting moulding, on steel-casting 7, be provided with and hang 8.
The present invention also provides the annealing device that is used for large-scale steel-casting hot shake-out technology of the present invention, and annealing device is processed by insulation material, but and at the steel-casting 7 peripheral confined spaces that form.In annealing device, be provided with base 6, steel-casting 7 is placed on the base, this base 6 can be steelframe, refractory brick, soft layer of sand etc.
Annealing device is used for the 7 control cooling velocities of the steel-casting behind the shake out, makes steel-casting 7 can under the condition of evenly cooling, accomplish structural transformation and shrinks with cooling, avoids cracking, to guarantee castability.Owing to shifted to an earlier date the shake out time of foundry goods, the holding time that reduced sandbox, cast melt pit, attaches etc., thus improve casting production efficiency.
According to the place layout in producing and the shape of steel-casting 7, this annealing device can adopt the slow cooling cover that can move, and perhaps adopts the burial pit 1 of fixed position.Further be, the annealing device of burial pit 1 form is provided with removable cover 9, conveniently puts into steel-casting 7 and prevents excessive heat radiation.As build special-purpose leer, also can reach the effect of slow cooling, but cost is higher.
Can be provided with heating plant 2, one in the above-mentioned annealing device, make things convenient for preheating, the 2nd, be used for cooling control when needed, to realize at the uniform velocity cooling to the steel-casting 7 of having relatively high expectations.Described heating plant 2 can adopt forms such as burner, air-heater.
In order suitably to strengthen cooling velocity when needed, make the each several part evenly cooling as far as possible of steel-casting 7, be provided with regulatable ventilation unit in the annealing device.As shown in Figure 2, ventilation unit can adopt forms such as air blast, from air inlet 3 air intakes that are arranged on the annealing device bottom, from return air inlet 4 return air that are arranged on annealing device top foundry goods is lowered the temperature.If have the burial pit of removable cover 9, also can suitably open removable cover 9, produce the gap in order to cooling, the heat exchange that ventilates as required, thereby the cooling velocity of regulating steel-casting 7.
Temperature-fall period for the ease of monitoring steel-casting 7 is provided with temperature measuring equipment 5 in the annealing device.Described temperature measuring equipment 5 can adopt thermocouple equitemperature sensor.
Claims (1)
1. large-scale steel casting production technology; May further comprise the steps: moulding, cast, insulation, shake out, knockout, cleaning; It is characterized in that: in incubation step when steel-casting (7) temperature is cooled to 750～850 ℃ shake out; Carry out the slow cooling step then: steel-casting (7) is put into the annealing device that is preheating to 500～600 ℃ and be cooled to below 300 ℃, change subsequent handlings such as knockout again over to the temperature drop speed of 10～20 ℃/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007102033828A CN101185966B (en) | 2007-12-25 | 2007-12-25 | Large-scale steel casting production technology and slowly cooling device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007102033828A CN101185966B (en) | 2007-12-25 | 2007-12-25 | Large-scale steel casting production technology and slowly cooling device thereof |
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| Publication Number | Publication Date |
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| CN101185966A CN101185966A (en) | 2008-05-28 |
| CN101185966B true CN101185966B (en) | 2012-07-04 |
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| CN2007102033828A Active CN101185966B (en) | 2007-12-25 | 2007-12-25 | Large-scale steel casting production technology and slowly cooling device thereof |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102211179B (en) * | 2010-04-09 | 2013-01-02 | 中国科学院金属研究所 | High-temperature shakeout process applied to large-size martensitic stainless steel cast |
| CN103667642A (en) * | 2012-09-14 | 2014-03-26 | 宝钢不锈钢有限公司 | Slab burial pit with adjustable cooling speed |
| CN103008626B (en) * | 2013-01-17 | 2015-08-12 | 中国科学院金属研究所 | For the method for the high temperate zone liquid core shake out of large extra thick plate blank |
| CN103128268B (en) * | 2013-01-17 | 2015-10-14 | 中国科学院金属研究所 | For the method for low temperature shake out in large extra thick plate blank |
| CN103920856A (en) * | 2014-04-29 | 2014-07-16 | 东兰音乐铜鼓文化传播有限责任公司 | Bronze drum directly molded by virtue of resin sand casting and method for molding bronze drum |
| CN104162650A (en) * | 2014-07-28 | 2014-11-26 | 洛阳王力重型机械有限公司 | Retarded cooling chamber special for hot casting |
| CN104308129B (en) * | 2014-09-30 | 2016-05-11 | 共享铸钢有限公司 | A kind of complex structure large-scale steel-casting hot shake-out annealing device and casting technique |
| CN108707733B (en) * | 2018-05-29 | 2019-11-19 | 辽宁福鞍重工股份有限公司 | A kind of process shortening the large-scale steel-casting production cycle |
| CN115468666A (en) * | 2022-07-27 | 2022-12-13 | 芜湖新兴铸管有限责任公司 | Slow cooling pit temperature monitoring system |
| CN115608967A (en) * | 2022-10-25 | 2023-01-17 | 共享铸钢有限公司 | A kind of anti-cracking production method of volute |
| CN116372104B (en) * | 2023-05-27 | 2025-04-08 | 襄阳金耐特机械股份有限公司 | A method for manufacturing cast steel by suppressing casting hot cracks |
| CN121649374B (en) * | 2026-02-05 | 2026-04-17 | 中国机械总院集团沈阳铸造研究所有限公司 | A multi-chamber vacuum casting method and apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2209679Y (en) * | 1993-01-21 | 1995-10-11 | 凌发荣 | Slow-cooling energy-saving apparatus |
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- 2007-12-25 CN CN2007102033828A patent/CN101185966B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2209679Y (en) * | 1993-01-21 | 1995-10-11 | 凌发荣 | Slow-cooling energy-saving apparatus |
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Effective date of registration: 20180320 Address after: 618013 Deyang Pearl River West Road, Sichuan, No. 460 Patentee after: Double (Deyang) heavy equipment Co., Ltd. Address before: 618013 Deyang Pearl River West Road, Sichuan, No. 460 Patentee before: Erzhong Group (Deyang) Heavy Equipment Co., Ltd. |
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