阅读说明：本技术 多密封气道内缸铸件的整铸方法 (The block cast method of more sealing air flue inner casing casting ) 是由 马斌 李永新 冯周荣 郭小利 李昆 于 2019-09-26 设计创作，主要内容包括：本发明属于铸钢件铸造技术领域,特别涉及一种多密封气道内缸铸件的整铸方法,所述内缸铸件包括多条密封气道,所述整铸方法包括如下过程：采用整体铸造工艺,将内缸铸件主体和气道半环铸造一体形成密封气道；内缸铸件的内腔结构由吊胎砂芯和若干气道砂芯组芯形成；每一所述气道砂芯中间设置冷却管一；根据内缸铸件的热节分布,设置冒口和补贴。本发明提供的整铸方法,将多个气道半环与主体缸体整体铸造成型,通过冒口、补贴、冷铁和防粘砂工艺的共同使用,生产出符合质量要求的整体内缸铸件。(The invention belongs to casting steel casting technical fields, in particular to a kind of block cast method of more sealing air flue inner casing casting, the inner casing casting includes a plurality of sealing air flue, the block cast method comprises the following processes: using integral casting process, inner casing casting body and the casting integrated formation of air flue semi-ring are sealed air flue；The inner-cavity structure of inner casing casting is formed by cope down sand core and several air flue sand core group cores；Cooling tube one is set among each air flue sand core；It is distributed according to the thermal center of inner casing casting, riser and subsidy is set.Multiple air flue semi-rings and main body cylinder body integral casting forming by being used in conjunction with for riser, subsidy, chill and Sand sticking-resistant technique, are produced the whole inner casing casting to conform to quality requirements by block cast method provided by the invention.)

1. a kind of block cast method of more sealing air flue inner casing casting, the inner casing casting includes a plurality of sealing air flue, and feature exists In the block cast method of more sealing air flue inner casing casting comprises the following processes:

Using integral casting process, inner casing casting body and the casting integrated formation of air flue semi-ring are sealed into air flue；

The inner-cavity structure of inner casing casting is formed by cope down sand core and several air flue sand core group cores；It is set among each air flue sand core Set cooling tube one；It is distributed according to the thermal center of inner casing casting, riser and subsidy is set.

2. the block cast method of more sealing air flue inner casing casting according to claim 1, which is characterized in that the inner casing casting Each thermal center vertical top the subsidy is set, described subsidize is arranged far from the air flue, and the top correspondence of the subsidy is set Set the riser.

3. the block cast method of more sealing air flue inner casing casting according to claim 2, which is characterized in that the two of the subsidy Insulating brick is arranged in side.

4. the block cast method of more sealing air flue inner casing casting according to claim 3, which is characterized in that the adjacent subsidy Between the air flue surface wall thickness minimum at be arranged feeding subregion chill.

5. the block cast method of more sealing air flue inner casing casting according to claim 4, which is characterized in that in the feeding point Cooling tube two is respectively set in the two sides of area's chill.

6. the block cast method of more sealing air flue inner casing casting according to claim 1, which is characterized in that each air flue Two cooling tubes one are at least set among sand core.

7. the block cast method of more sealing air flue inner casing casting according to claim 6, which is characterized in that the cooling tube one Sectional area be the air flue sand core sectional area 10%~30%.

Technical field

The invention belongs to casting steel casting technical field, in particular to a kind of block cast side of more sealing air flue inner casing casting Method.

Background technique

Inner casing casting structure on ultra supercritical steam turbine unit is complicated, which includes a variety of songs Facial canal mouth, multiple closed airways, and nozzle is tiny, air flue is more compared with narrow ditribution, wall ratio changes greatly, while casting quality requirement It is high, it is desirable that high temperature resistant, high pressure, anticorrosion, shock resistance, Requirements of Nondestructive Testing are stringent, it is desirable that cannot to have slag inclusion, shrinkage porosite, crackle Etc. casting flaws.At present since inner casing casting air flue is relatively narrow, in order to avoid scab, the finishing of air flue is facilitated to handle, using inner casing Casting body is cast respectively with multiple air flue semi-rings, then multiple air flue semi-rings is welded as a whole to be formed with inner casing casting body Air flue；This casting method welding process and quality are difficult to control, and complex procedures, process-cycle are long.

Summary of the invention

It, then will be more object of the present invention is to be cast respectively for inner casing casting body in the prior art with multiple air flue semi-rings A air flue semi-ring and inner casing casting body be welded as a whole to be formed the casting method of air flue there are the problem of, one kind is provided and is sealed more The block cast method of air flue inner casing casting, by multiple air flue semi-rings and main body cylinder body integral casting forming, by riser, subsidy, cold Being used in conjunction with for iron and Sand sticking-resistant technique, produces the whole inner casing casting to conform to quality requirements.

The object of the present invention is achieved like this:

A kind of block cast method of more sealing air flue inner casing casting, the inner casing casting includes a plurality of sealing air flue, described whole Casting method comprises the following processes: using integral casting process, inner casing casting body and the casting integrated formation of air flue semi-ring are sealed Air flue；The inner-cavity structure of inner casing casting is formed by cope down sand core and several air flue sand core group cores；Among each air flue sand core Cooling tube one is set；It is distributed according to the thermal center of inner casing casting, riser and subsidy is set.

As a further solution of the present invention, the subsidy, institute is arranged in the vertical top of each thermal center of the inner casing casting It states subsidy to be arranged far from the air flue, the subsidy can be reduced in this way, heat affecting is crossed to the air flue sand core；The subsidy Top be correspondingly arranged the riser；The riser prevents process of setting from generating shrinkage porosite and shrinkage cavity defect for solidifying feeding.

As a further solution of the present invention, the subsidy is subsidized using wall, and the riser uses wall riser.

As a further solution of the present invention, insulating brick is arranged in the two sides of the subsidy, can reduce the subsidy in this way Thickness.

As a further solution of the present invention, it is set at the surface wall thickness minimum of the air flue between the adjacent subsidy Set feeding subregion chill；The region of the adjacent subsidy feeding can be made to form end region in advance in this way, and in the feeding Chill is added on subregion chill, the heat storage capacity of the feeding subregion chill can be enhanced in this way, reinforces chill between air flue Sand mold forms chilling action, reduces air flue scab tendency.

As a further solution of the present invention, cooling tube two is respectively set in the two sides of the feeding subregion chill.

As a further solution of the present invention, two cooling tubes one are at least set among each air flue sand core.

As a further solution of the present invention, the sectional area of the cooling tube one is the sectional area of the air flue sand core 10%~30%, the cooling tube one is 50mm~100mm apart from air flue sand core surface sand layer thickness, prevents molten steel direct Cooling tube one is touched, while needing to guarantee cooling effect as close as possible to cast(ing) surface.

As a further solution of the present invention, after being poured, each cooling tube one and each cooling are given The independent conveying cooling medium of pipe two, the cooling medium can select compressed air or water or liquid according to the heat dispersal situations of sand core Nitrogen.

In the block cast method of more sealing air flue inner casing casting of the invention, by the way that multiple air flue semi-rings and main body cylinder body are whole Body casting and forming, solves in the prior art that inner casing casting body is cast respectively with multiple air flue semi-rings, then by multiple air flues Semi-ring and inner casing casting body are welded as a whole to form all problems existing for the casting method of air flue；Simultaneously according to inner casing casting Thermal center distribution, riser and subsidy and chill are rationally set, and avoid the scheme of air flue using subsidy and riser, reduce entirety Wall riser and wall subsidy cross heat affecting to closed airway when casting；Technical solution of the present invention is further to cope down sand core With several air flue sand cores by setting more types of cooling such as feeding subregion chill and cooling tube, plays the role of common Quench, drop The scab tendency of low closed airway.

Detailed description of the invention

Attached drawing 1 is the schematic diagram of inner casing casting structure of the present invention；

Attached drawing 2 is inner casing cast casting process schematic representation of the present invention；

In figure: 10- inner casing casting body；11- air flue semi-ring；12- air flue；13- thermal center 1；14- thermal center two；15- heat Section three；16- riser one；17- riser two；18- riser three；19- subsidy one；20- subsidy two；21- subsidy three；22- feeding subregion Chill；23- cooling tube one；24- cooling tube two.

Specific embodiment

In order to which technical problems, technical solutions and advantages to be solved are more clearly understood, tie below Attached drawing of the invention is closed, a technical solution of invention is further described in detail.

In the present invention unless specifically defined or limited otherwise, term shall be understood in a broad sense, for the common of this field For technical staff, the concrete meaning of term in the present invention can be understood as the case may be.

A kind of block cast method of more sealing air flue inner casing casting, inner casing casting includes a plurality of sealing air flue, refers to attached drawing 1, shown in 2, block cast method is comprised the following processes: using integral casting process, inner casing casting body 10 and air flue semi-ring 11 are cast Make integrally formed sealing air flue 12；The inner-cavity structure of inner casing casting 10 is formed by cope down sand core and 12 sand core group core of several air flues； Cooling tube 1 is set among each 12 sand core of air flue；It is distributed according to the thermal center of inner casing casting, riser and subsidy is set.

Specifically, the thermal center of inner casing casting includes thermal center 1, thermal center 2 14 and thermal center 3 15；Thermal center 1, thermal center two 14 and thermal center 3 15 it is vertical top be correspondingly arranged subsidy 1, subsidy 2 20 and subsidy 3 21；Subsidize one 19,2 20 and of subsidy It subsidizes 3 21 to be arranged far from air flue 12, it is possible to reduce subsidize and cross heat affecting to neighbouring 12 sand core of air flue；Subsidize one 19, subsidy 2 20 are correspondingly arranged riser 1, riser 2 17 and riser 3 18, subsidy 1, subsidy 2 20 with the vertical top for subsidizing 3 21 It is all made of wall subsidy with subsidy 3 21, riser 1, riser 2 17 and riser 3 18 are all made of wall riser, can mend in this way Division dissipates independent thermal center.In order to reduce subsidy 1, subsidy 2 20 and the thickness for subsidizing 3 21, in subsidy 1, subsidy two 20 are respectively set insulating brick with the two sides for subsidizing 3 21.

Feeding subregion chill 22 is respectively set between subsidy 1 and subsidy 2 20, subsidy 2 20 and subsidy 3 21, and Chill is added on feeding subregion chill 22, enhances the heat storage capacity of feeding subregion chill 22；The two of feeding subregion chill 22 Cooling tube 2 24 is respectively set in side, and can improve play chilling action, prevent scab the defects of generation in this way.

It is cooling to be situated between to each cooling tube 1 and the independent conveying cooling medium of each cooling tube 2 24 after being poured Matter can select compressed air or water or liquid nitrogen, can take away air flue 12 by heat exchange in this way according to the heat dispersal situations of sand core Heat in sand core reduces the scab tendency of closed airway 12.

Wherein, two cooling tubes 1 are at least set among each 12 sand core of air flue, and the sectional area of cooling tube 1 is gas The 10%~30% of the sectional area of 12 sand core of road, cooling tube 1 apart from 12 sand core surface sand layer thickness of air flue be 50mm~ 100mm prevents molten steel from directly contacting cooling tube 1, while needing to guarantee cooling effect as close as possible to cast(ing) surface.

The foregoing is only a preferred embodiment of the present invention, is not limited to invent, although referring to aforementioned implementation Invention is explained in detail for example, for those skilled in the art, still can be to foregoing embodiments Documented technical solution is modified or equivalent replacement of some of the technical features, all in spirit of the invention Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.