CN106607559A - Sand-mold molding method for water turbine blade - Google Patents
Sand-mold molding method for water turbine blade Download PDFInfo
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- CN106607559A CN106607559A CN201510692156.5A CN201510692156A CN106607559A CN 106607559 A CN106607559 A CN 106607559A CN 201510692156 A CN201510692156 A CN 201510692156A CN 106607559 A CN106607559 A CN 106607559A
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Abstract
A sand-mold molding method for a water turbine blade includes the following steps of model manufacturing, molding with the model, box closing and box erecting. By means of the sand-mold molding method for the water turbine blade, the sand consumption can be lowered, the production cost can be reduced, and the molding production cycle can be shortened.
Description
Technical field
The present invention relates to casting technology field, the sand mold formative method of more particularly to a kind of turbine blade.
Background technology
As the hydraulic turbine develops to high efficiency, maximization direction, China develops and builds some large and medium-sized power stations in succession.Global Foundry Market economic situation is bad, dog-eat-dog, in the environment of foundry goods profit margin is increasingly compressed, customer is shorter and shorter to the delivery cycle for requiring.This requires that Foundry Works, while production cost is reduced, lifts casting quality, and process time of doing over again caused by reducing size, quality problems shortens the castings production cycle.
Blade of large-sized water turbine molded line is complicated, difference of height is big, and sand casting generally using the method for cored-up mould, is defined by the positive and negative pressure surface of blade and makes two core boxes.Production procedure is for " coremaking --- organizes core --- vertical core --- moulding ", concretely：The core in positive and negative face is made first, then two cores are grouped together, while carrying out a conjunction, then vertical core using elongated bolt, finally place sandbox laying running gate system, cocurrent sand molding.For overall size more than 1500 × 1500 × 800mm, there is following deficiency more than the moulding of the turbine blade of 5t in casting weight to the method：First, the positive and negative pressure surface of blade to be directed to makes core box, and as core box size and constructive difficulty are big, manufacturing cost is higher；Secondly, core assembly process sand using amount is big, and foundry goods pressure case temperature fall time is long；Again, core process complexity is organized, precision is difficult to control to, and is also easy to produce fash after cast between core, and casting dimension deviation is big.In addition, the formative method production procedure of above-mentioned prior art is complicated, long the production cycle.
The content of the invention
In view of this, it is necessary to which a kind of sand mold formative method for reducing sand using amount and production cost and shortening the turbine blade of moulding production cycle is provided.
A kind of sand mold formative method of turbine blade, comprises the steps：
Modelling：The blade physical model corresponding with turbine blade is made, with the contoured surface that Blade roughcast is formed using blade physical model in moulding；According to the contour line of turbine blade, framework tire plate is made, to support and locating blades physical model using framework tire plate；According to the shape of framework tire plate, profile-followed core print is made in framework tire plate surrounding, to utilize profile-followed core print to form the core print of sand mold；According to the shape of profile-followed core print, make the gap plate of same shape, thickness for 1 ~ 1.5mm, and gap plate is corresponding with the shape of profile-followed core print side and upper surface, formed between the sand mold for cooperating certain gap to give by gap plate, and then ensure the smooth of mould assembling；
Using model moulding：Framework tire plate and profile-followed core print are placed on build platform, alignment pin is installed in the region contacted with blade physical model in framework tire plate, with by positioning the blade physical model that finger setting is placed；After placing the first sandbox, lay running gate system and carry out the quicksand moulding of the first sandbox；After the first sand mold hardening of the first sandbox, the first sandbox is overturn so that framework tire plate, profile-followed core print, blade physical model, the exposed face of sand mold are located above build platform, remove and gap plate is set on framework tire plate and profile-followed core print, and corresponding with profile-followed core print gap on the first sand mold；After arbor being set in the gap corresponding with framework tire plate on the first sand mold and insulating powder being brushed on the exposed face of the first sand mold, then carry out quicksand moulding on the first sand mold, to obtain the second sand mold；After the hardening of the second sand mold, the second sand mold and the gap plate on the first sand mold and blade physical model shape are taken away.
Mould assembling and vertical case：Swabbing is carried out to the first sand mold and the second sand mold, to prevent scab, the mould assembling after qualified is operated and founds case.
By using the formative method of the present invention, following effect has been reached：
1. only full pattern leaf model and passive frame-type tire plate need to be made by die joint of the suction surface of blade before blade shape construction production, the usage amount of timber is reduced, while Mold Making difficulty is significantly reduced.Mold Making expense is compared with the scheme for making core box and reduces 25% or so.
2. when blade shape construction is produced, sandbox volume is many compared with reducing during cored-up mould, while together laying during running gate system moulding, is not required to additionally increase sandbox, and sand using amount reduces obvious, while can also add sand lump etc. during moulding, can further reduce sand using amount；Blade roughcast sand using amount declines 45% compared with using sand using amount during conventional method moulding；Meanwhile, the foundry goods pressure case time is effectively shortened, shortens the castings production cycle.In actual production, the pressure case cycle averagely reduces 6 days.
3. the size quality of effective control Blade roughcast, the measuring and calculating of Jing scenes, the dimension overproof class problem for existing, more conventional formative method reduce 28% or so, and process cycle have dropped 20% or so.
Specific embodiment
The present invention provides a kind of sand mold formative method of turbine blade, by making the blade physical model corresponding with turbine blade, then blade physical model is placed in sandbox carries out drift sand moulding, after finally take out blade physical model, sand mold cavity of the gap that blade physical model is stayed in sand mold as casting turbine blade.The sand mold formative method of the turbine blade, comprises the steps：
Step S300, modelling：The blade physical model corresponding with turbine blade is made, with the contoured surface that Blade roughcast is formed using blade physical model in moulding；According to the contour line of turbine blade, framework tire plate is made, to support and locating blades physical model using framework tire plate；According to the shape of framework tire plate, make profile-followed core print in framework tire plate surrounding, to utilize profile-followed core print to form the core print of sand mold, wherein, it is ensured that profile-followed core print is smooth, and reduces cambered surface, while enough gradients will be had, it is ensured that type of having unpacked it is smooth；According to the shape of profile-followed core print, make the gap plate of same shape, thickness for 1 ~ 1.5mm, and gap plate is corresponding with the shape of profile-followed core print side and upper surface, formed between the sand mold for cooperating certain gap to give by gap plate, and then ensure the smooth of mould assembling.
Step S301, using model moulding：Framework tire plate and profile-followed core print are placed on build platform, alignment pin is installed in the region contacted with blade physical model in framework tire plate, with by positioning the blade physical model that finger setting is placed；After placing the first sandbox, lay running gate system and carry out the quicksand moulding of the first sandbox；After the first sand mold hardening of the first sandbox, the first sandbox is overturn so that framework tire plate, profile-followed core print, blade physical model, the exposed face of sand mold are located above build platform, remove and gap plate is set on framework tire plate and profile-followed core print, and corresponding with profile-followed core print gap on the first sand mold；After arbor being set in the gap corresponding with framework tire plate on the first sand mold and insulating powder being brushed on the exposed face of the first sand mold, then carry out quicksand moulding on the first sand mold, to obtain the second sand mold；After the hardening of the second sand mold, the second sand mold and the gap plate on the first sand mold and blade physical model shape are taken away.
Step S302, mould assembling and vertical case：Swabbing is carried out to the first sand mold and the second sand mold, scab is prevented, the mould assembling after qualified is operated and founds case.Step S302 is specially：The swabbing on the first sand mold, the second sand mold；After second sand mold is placed on the first sand mold, the resin sand that a layer thickness is 40 ~ 60mm is flowed at the back side of the second sand mold, ensure that the back side of the second sand mold is concordant with sandbox upper surface, simultaneously can be in close contact with base plate, then, scrape it is smooth after resin sand on place base plate, base plate must cover the back side of the second sand mold, the length and width degree of base plate ensures to be close to the outline length and width degree of sandbox or equal, reuses " U " type card and base plate is coupled together with sandbox, finally founds case.In the present invention, the first sandbox being previously mentioned, according to the needs in actual production, the first sandbox can be nowel or top box.
By using the formative method of the present invention, following effect has been reached：
1. only full pattern leaf model and passive frame-type tire plate need to be made by die joint of the suction surface of blade before blade shape construction production, the usage amount of timber is reduced, while Mold Making difficulty is significantly reduced.Mold Making expense is compared with the scheme for making core box and reduces 25% or so.
2. when blade shape construction is produced, sandbox volume is many compared with reducing during cored-up mould, while together laying during running gate system moulding, is not required to additionally increase sandbox, and sand using amount reduces obvious, while can also add sand lump etc. during moulding, can further reduce sand using amount；Blade roughcast sand using amount declines 45% compared with using sand using amount during conventional method moulding；Meanwhile, the foundry goods pressure case time is effectively shortened, shortens the castings production cycle.In actual production, the pressure case cycle averagely reduces 6 days.
3. the size quality of effective control Blade roughcast, the measuring and calculating of Jing scenes, the dimension overproof class problem for existing, more conventional formative method reduce 28% or so, and process cycle have dropped 20% or so.
Claims (3)
1. a kind of sand mold formative method of turbine blade, comprises the steps：
Modelling：The blade physical model corresponding with turbine blade is made, with the contoured surface that Blade roughcast is formed using blade physical model in moulding；According to the contour line of turbine blade, framework tire plate is made, to support and locating blades physical model using framework tire plate；According to the shape of framework tire plate, profile-followed core print is made in framework tire plate surrounding, to utilize profile-followed core print to form the core print of sand mold；According to the shape of profile-followed core print, make the gap plate of same shape, thickness for 1 ~ 1.5mm, and gap plate is corresponding with the shape of profile-followed core print side and upper surface, formed between the sand mold for cooperating certain gap to give by gap plate, and then ensure the smooth of mould assembling；
Using model moulding：Framework tire plate and profile-followed core print are placed on build platform, alignment pin is installed in the region contacted with blade physical model in framework tire plate, with by positioning the blade physical model that finger setting is placed；After placing the first sandbox, lay running gate system and carry out the quicksand moulding of the first sandbox；After the first sand mold hardening of the first sandbox, the first sandbox is overturn so that framework tire plate, profile-followed core print, blade physical model, the exposed face of sand mold are located above build platform, remove and gap plate is set on framework tire plate and profile-followed core print, and corresponding with profile-followed core print gap on the first sand mold；After arbor being set in the gap corresponding with framework tire plate on the first sand mold and insulating powder being brushed on the exposed face of the first sand mold, then carry out quicksand moulding on the first sand mold, to obtain the second sand mold；After the hardening of the second sand mold, the second sand mold and the gap plate on the first sand mold and blade physical model shape are taken away；
Mould assembling and vertical case：Swabbing is carried out to the first sand mold and the second sand mold, to prevent scab, the mould assembling after qualified is operated and founds case.
2. the sand mold formative method of turbine blade according to claim 1, it is characterised in that：" carrying out swabbing to the first sand mold and the second sand mold, to prevent scab, the mould assembling after qualified is operated and founds case " is specially：The swabbing on the first sand mold, the second sand mold；After second sand mold is placed on the first sand mold, the resin sand that a layer thickness is 40 ~ 60mm is flowed at the back side of the second sand mold, ensure that the back side of the second sand mold is concordant with sandbox upper surface, simultaneously can be in close contact with base plate, then, scrape it is smooth after resin sand on place base plate, base plate must cover the back side of the second sand mold, the length and width degree of base plate ensures to be close to the outline length and width degree of sandbox or equal, reuses " U " type card and base plate is coupled together with sandbox, finally founds case.
3. the sand mold formative method of turbine blade according to claim 1, it is characterised in that：First sandbox is nowel.
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| CN201510692156.5A CN106607559B (en) | 2015-10-23 | 2015-10-23 | The sand mold formative method of turbine blade |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107598100A (en) * | 2017-09-11 | 2018-01-19 | 芜湖市云峰铸造有限责任公司 | A kind of Automobile flywheel casting technique and its device |
| CN113500165A (en) * | 2021-07-13 | 2021-10-15 | 烟台恒邦合金材料有限公司 | Method for producing impeller blade mould by using gypsum matrix |
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| CN104942236A (en) * | 2015-05-14 | 2015-09-30 | 辽宁福鞍重工股份有限公司 | Molding method for vertical pouring production of blade without sand box |
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| US3830279A (en) * | 1969-05-28 | 1974-08-20 | Alusuisse | Method and apparatus for forming sand molds |
| US4791975A (en) * | 1987-03-19 | 1988-12-20 | Cmi International, Inc. | Process of flaskless sand casting |
| CN101015851A (en) * | 2007-03-12 | 2007-08-15 | 哈尔滨电机厂有限责任公司 | Technique for casting turbine blade |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107598100A (en) * | 2017-09-11 | 2018-01-19 | 芜湖市云峰铸造有限责任公司 | A kind of Automobile flywheel casting technique and its device |
| CN113500165A (en) * | 2021-07-13 | 2021-10-15 | 烟台恒邦合金材料有限公司 | Method for producing impeller blade mould by using gypsum matrix |
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| CN106607559B (en) | 2018-09-18 |
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