CN104959535B - Tubular Si Taili machine parts'precise casting and molding method - Google Patents
Tubular Si Taili machine parts'precise casting and molding method Download PDFInfo
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Abstract
The invention discloses a kind of tubular Si Taili machine parts'precise casting and molding method, comprise the following steps: 1). according to the design shape of tubular Si Taili part, manufacture the most suitable ceramic shell mould in fusible pattern mode；2). ceramic shell mould is preheated under conditions of temperature is 900～1200 DEG C and is incubated 1～5 hour, it is ensured that the homogeneous temperature at each position of ceramic shell mould；After stellite ingot casting is melted under conditions of 1400～1500 DEG C, it is cast in preheated ceramic shell mould, is frozen into foundry goods；3). cleaning formwork；After barrel structure castings is incubated 1～4 hour under conditions of 1000～1200 DEG C, Quenching Treatment, air cooling after then barrel structure castings being incubated 3～6 hours under conditions of 870～980 DEG C.It to be realized with a low cost the production molding of standardization, mass, has considerable economic benefit and social benefit to tubular Si Taili part, reliable and practical.
Description
Technical field
The present invention relates to precision casting technology, specifically a kind of tubular Si Taili machine parts'precise casting and molding method.
Background technology
Steam turbine valve parts requires that its sealing surface has certain hardness, to ensure wearability, extends part service life.
Wearing layer molding currently for steam turbine valve parts sealing surface mainly has two ways.One; it is to use plasma spray welding technology at valve parts surface overlaying stellite layer; on the sealing surface of steam turbine valve parts, the wearing layer of stellite is formed with this; this technique needs the different diameter of bores according to valve parts; design and produce high performance series Hole plasma welding rifle, and it requires harshness, complex procedures to operator's technology and surrounding; yield rate is the lowest, it is impossible to realize standardization, scale molding.Its two, be to use casting method for centrifugal to prepare overall Si Taili neck bush, then by after integral lining and overcoat elastic conjunction, end face soldering and sealing so that it is reach to seal, wear-resisting effect；This technology only has only a few producer to possess production capacity, thus the steam turbine valve parts of institute's molding is expensive.
In sum, steam turbine valve parts as the tubular Si Taili part of tubular Si Taili part, especially thin-walled, carries out single standardization molding currently without a kind of reasonable, effective, economic method to it with Si Taili wearing layer.
Summary of the invention
The goal of the invention of the present invention is: for Si Taili wearing layer existence demand on industrial equipment part, and the deficiency of existing forming technique, independent research one tubular Si Taili machine parts'precise casting and molding method,
The technical solution adopted in the present invention is, a kind of tubular Si Taili machine parts'precise casting and molding method, comprises the following steps:
1). according to the design shape of tubular Si Taili part, manufacture the most suitable ceramic shell mould in fusible pattern mode；
2). ceramic shell mould is preheated under conditions of temperature is 900～1200 DEG C and is incubated 1～5 hour, it is ensured that the homogeneous temperature at each position of ceramic shell mould；After stellite ingot casting is melted under conditions of 1400～1500 DEG C, it is cast in preheated ceramic shell mould, is frozen into foundry goods；
3). cleaning formwork；After barrel structure castings is incubated 1～4 hour under conditions of 1000～1200 DEG C, Quenching Treatment, air cooling after then barrel structure castings being incubated 3～6 hours under conditions of 870～980 DEG C.
Further, described ceramic shell mould takes shape in the running gate system of pottery；Described running gate system includes cup and running channel, described cup communicates with running channel, described running channel is provided with at least one ceramic shell mould, described ceramic shell mould mainly internal layer formwork and outer layer formwork by annular configuration forms, and forms the annular space die cavity of coupling tube shape component design shape between inside and outside layer formwork.
Further, described running channel is mainly made up of cross gate integrally and ingate, and the end face of described cross gate is used for arranging cup, and the internal diameter of described ingate is unanimously to the internal diameter of annular space die cavity, and the external diameter of ingate is more than the external diameter of annular space die cavity.
Described internal layer formwork is tubular structure, and internal layer formwork and outer layer formwork arrange molding with concentric circular fashion.
Preferably, on the outer wall of described ceramic shell mould in the way of the most sequentially, it is provided with the heat-insulation layer that heat insulating ability is incremented by.Described stellite liquation is remelting liquation.Further, described stellite liquation is for taking charge of the most vertical 6# alloy molten solution.
The cooling medium of described Quenching Treatment is water.
The forming method of the running gate system of above-mentioned pottery, comprises the following steps:
1.. according to design shape and the quantity to be poured into a mould of tubular Si Taili part, prepare correspondence, the die cavity wax-pattern of tubular structure, and prepare cup wax-pattern and running channel wax-pattern；
2.. the cup wax-pattern prepared is combined on running channel wax-pattern by upper and lower order is corresponding with die cavity wax-pattern, forms wax tree with this；
3.. on step wax tree 2., in the way of mucilage drenches sand, make ceramic case, through dewaxing and the running gate system of roasting forming ceramic.
Further, described running channel wax-pattern offering the circular hole of Cavity wax-pattern, the diameter matches of this circular hole is in the external diameter of die cavity wax-pattern.
Preferably, on the ceramic shell mould outer wall of step 3. institute's molding in the way of the most sequentially, it is provided with the heat-insulation layer that heat insulating ability is incremented by.
The invention has the beneficial effects as follows: the present invention has been reliably achieved the standardization molding of tubular Si Taili part, molding low cost with Investment casting technology, and forming operation is easy, and yield rate is high；The even tissue of the tubular Si Taili part of institute of the present invention molding, substantially without rarefaction defect, it is possible to effectively meets the technology requirement of industrial equipment part；The present invention can realize the production molding of scale, mass to tubular Si Taili part, has considerable economic benefit and social benefit, reliable and practical.
Accompanying drawing explanation
The present invention is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is a kind of section of structure of running gate system formwork of the present invention.
Fig. 2 is the wax tree structural representation of running gate system shown in molding Fig. 1.
Fig. 3 is the top view of Fig. 2.
Code name implication in figure: 1 cup；2 cross gates；3 ingates；4 annular space die cavities；5 internal layer formworks；6 outer layer formworks；7 cup wax-patterns；8 running channel wax-patterns；9 die cavity wax-patterns.
Detailed description of the invention
Embodiment 1
The present invention is the precision casting molding method of tubular Si Taili part, and it comprises the following steps:
1). according to the design shape of tubular Si Taili part, manufacture the most suitable ceramic shell mould in fusible pattern mode.
Concrete (shown in Figure 1), the ceramic shell mould of the present invention takes shape in the running gate system of pottery, and this running gate system includes 1, running channel of a cup and two ceramic ring casement chamber formworks.
Wherein, cup 1 takes shape in the top of running channel, is preferably located at the end face central authorities of running channel.Cup 1 leads to the interior Kongxiang of running channel.Running channel is mainly made up of cross gate 2 integrally and ingate 3；Ingate 3 is two, they with the circular two ends taking shape in cross gate 2 at.What the profile size of whole running channel should be able to ensure that two ceramic shell moulds is arranged in juxtaposition space.
Each ceramic shell mould mainly internal layer formwork 5 and outer layer formwork 6 by annular configuration forms, internal layer formwork 5 is tubular structure, internal layer formwork 5 and outer layer formwork 6 arrange molding with concentric circular fashion, form the annular space die cavity 4 of coupling tube shape component design shape between inside and outside layer formwork.Two ceramic shell mould correspondences respectively are molded at the ingate 3 at running channel two ends.The top of the internal layer formwork 5 of ceramic shell mould extends to the end face at ingate 3, and the top of outer layer formwork 6 extends only to the bottom surface at ingate 3, and ingate 3 should communicate with the annular space die cavity 4 of corresponding ceramic shell mould.Based on above-mentioned and aforementioned injection system structure, the internal diameter of each ingate 3 should be unanimously to the internal diameter of the annular space die cavity 4 of correspondence, the external diameter of ingate 3 should be greater than the external diameter of annular space die cavity 4, ensure that the axiality of institute's mould casting the most well, prevents the deformation of foundry goods to greatest extent.
See Fig. 2 and Fig. 3, the forming method of above-mentioned pottery running gate system, comprise the following steps:
1.. according to design shape (including structure and overall size etc.) and product quantity (the i.e. tubular Si Taili number of parts of the wanted molding of this batch to be poured into a mould of tubular Si Taili part, the present embodiment is two), prepare correspondence, the die cavity wax-pattern 9 of tubular structure, this die cavity wax-pattern 9 be coupling tubular Si Taili Element Design shape tubular structure wax-pattern, i.e. die cavity wax-pattern 9 be by wax injector according to tubular Si Taili part design shape suppress form；And by wax injector compacting cup wax-pattern 7 and running channel wax-pattern 8, this running channel wax-pattern 8 is the two ends strip wax-patterns respectively in arc-shaped, offers the circular hole concentric with end arc-shaped at the two ends of running channel wax-pattern 8 respectively, and aforementioned circular hole is used for connecting die cavity wax-pattern 9；The press temperature of aforementioned wax injector be usually 60～70 DEG C, pressing pressure be usually 0.8～1.5MPa；
2.. the cup wax-pattern 7 prepared is welded and combines the end face central authorities at running channel wax-pattern 8, at the circular hole at the corresponding two ends being welded on running channel wax-pattern 8 respectively, the top of two die cavity wax-patterns 9, make the circular hole arranged concentric that die cavity wax-pattern 9 is corresponding with on running channel wax-pattern 8；Wax tree is formed with this；
3.. on step wax tree 2., in the way of mucilage drenches sand, make ceramic case, concrete, the end face (the highest end face of the most whole wax tree) removing cup wax-pattern 7 drenches outside sand process without carrying out mucilage, the all surface of whole wax tree all carries out mucilage and drenches sand process, after the mucilage on wax tree drenches sand molding, by aforementioned wax tree through dewaxing and calcination process, must have the ceramic running gate system of cavity.
2). the running gate system of said structure and the molding of method institute is placed in resistance furnace, preheats under conditions of temperature is 900 DEG C and be incubated 5 hours, ensureing the homogeneous temperature at each position of running gate system with this.
During running gate system preheats, the ingot casting taking charge of the most vertical 6# alloy is carried out remelting fusing, until it fully melts under conditions of temperature is 1500 DEG C.
After running gate system is preheated, it is drawn off resistance furnace；Being cast in running gate system by the remelting liquation of stellite, concrete, stellite liquation enters running channel from the cup 1 of running gate system, then is dispersed in the annular space die cavity 4 of ceramic shell mould by running channel, and alloy molten solution from top to bottom fills annular space die cavity 4 again；Alloy molten solution in running gate system is frozen into foundry goods.
3). after the casting solidification in running gate system, the formwork of running gate system is carried out cleaning and removes, and the arrangement from foundry goods tree of the barrel structure castings in institute's mould casting is scaled off, form tubular Si Taili foundry goods monomer.
Then each tubular Si Taili foundry goods monomer of institute's molding is carried out heat treatment.Concrete, tubular Si Taili foundry goods is placed in heat-treatment furnace, under conditions of temperature is 1000 DEG C, after being incubated 3 hours, Quenching Treatment, cooling medium is water, then air cooling after tubular Si Taili foundry goods being incubated 6 hours under conditions of 870 DEG C, obtains the Si Taili part of tubular.
Embodiment 2
The present invention is the precision casting molding method of tubular Si Taili part, and it comprises the following steps:
1). according to the design shape of tubular Si Taili part, manufacture the most suitable ceramic shell mould in fusible pattern mode.
Concrete, the ceramic shell mould of the present invention takes shape in the running gate system of pottery, and this running gate system includes a cup, a running channel and three ceramic ring casement chamber formworks.
Wherein, cup takes shape in the top of running channel, is preferably located at the end face central authorities of running channel.Cup leads to the interior Kongxiang of running channel.Running channel is people's shape structure, and this running channel is mainly made up of cross gate integrally and ingate；Ingate is three, they with circular three ends taking shape in herringbone cross gate at.The profile size of whole running channel should be able to ensure that the triangle arrangement space of three ceramic shell moulds.
Each ceramic shell mould mainly internal layer formwork and outer layer formwork by annular configuration forms, and internal layer formwork is tubular structure, and internal layer formwork and outer layer formwork arrange molding with concentric circular fashion, forms the annular space die cavity of coupling tube shape component design shape between inside and outside layer formwork.Three ceramic shell mould correspondences respectively are molded at the ingate of running channel three end.The top of the internal layer formwork of ceramic shell mould extends to the end face at ingate, and the top of outer layer formwork extends only to the bottom surface at ingate, and ingate should communicate with the annular space die cavity of corresponding ceramic shell mould.Based on above-mentioned and aforementioned injection system structure, the internal diameter of each ingate should be unanimously to the internal diameter of the annular space die cavity of correspondence, the external diameter of ingate should be greater than the external diameter of annular space die cavity, ensure that the axiality of institute's mould casting the most well, prevents the deformation of foundry goods to greatest extent.
The forming method of the running gate system of above-mentioned pottery, comprises the following steps:
1.. according to design shape (including structure and overall size etc.) and quantity (the i.e. tubular Si Taili number of parts of the wanted molding of this batch of product to be poured into a mould of tubular Si Taili part, the present embodiment is three), prepare correspondence, the die cavity wax-pattern of tubular structure, this die cavity wax-pattern be coupling tubular Si Taili Element Design shape tubular structure wax-pattern, i.e. die cavity wax-pattern be by wax injector according to tubular Si Taili part design shape suppress form；And by wax injector compacting cup wax-pattern and running channel wax-pattern, this running channel wax-pattern is three ends herringbone wax-patterns respectively in arc-shaped, offers the circular hole concentric with end arc-shaped at three ends of running channel wax-pattern respectively, and aforementioned circular hole is used for connecting die cavity wax-pattern；The press temperature of aforementioned wax injector be usually 60～70 DEG C, pressing pressure be usually 0.8～1.5MPa；
2.. the end face central authorities at running channel wax-pattern are combined in the cup wax-pattern welding prepared, is welded on corresponding respectively for the top of three die cavity wax-patterns at the circular hole of three ends of running channel wax-pattern, makes the circular hole arranged concentric that die cavity wax-pattern is corresponding with on running channel wax-pattern；Wax tree is formed with this；
3.. on step wax tree 2., in the way of mucilage drenches sand, make ceramic case, concrete, the end face (the highest end face of the most whole wax tree) removing cup wax-pattern drenches outside sand process without carrying out mucilage, the all surface of whole wax tree all carries out mucilage and drenches sand process, after the mucilage on wax tree drenches sand molding, by aforementioned wax tree through dewaxing and calcination process, must have the ceramic running gate system of cavity.
2). the running gate system of said structure and the molding of method institute is placed in resistance furnace, preheats under conditions of temperature is 1100 DEG C and be incubated 4 hours, ensureing the homogeneous temperature at each position of running gate system with this.
During running gate system preheats, the ingot casting taking charge of the most vertical 6# alloy is carried out remelting, until it fully melts under conditions of temperature is 1450 DEG C.
After running gate system is preheated, it is drawn off resistance furnace；Being cast in running gate system by the remelting liquation of stellite, concrete, stellite liquation enters running channel from the cup of running gate system, then is dispersed into the annulus type intracavity of ceramic shell mould by running channel, and alloy molten solution from top to bottom fills annular space die cavity again；Alloy molten solution in running gate system is frozen into foundry goods.
3). after the casting solidification in running gate system, the formwork of running gate system is carried out cleaning and removes, and the arrangement from foundry goods tree of the barrel structure castings in institute's mould casting is got off, form tubular Si Taili foundry goods monomer.
Then each tubular Si Taili foundry goods monomer of institute's molding is carried out heat treatment.Concrete, tubular Si Taili foundry goods is placed in heat-treatment furnace, under conditions of temperature is 1100 DEG C, after being incubated 2 hours, Quenching Treatment, cooling medium is water, then air cooling after tubular Si Taili foundry goods being incubated 4 hours under conditions of 920 DEG C, obtains the Si Taili part of tubular.
Embodiment 3
The present invention is the precision casting molding method of tubular Si Taili part, and it comprises the following steps:
1). according to the design shape of tubular Si Taili part, manufacture the most suitable ceramic shell mould in fusible pattern mode.
Concrete, the ceramic shell mould of the present invention takes shape in the running gate system of pottery, and this running gate system includes a cup, a running channel and four ceramic ring casement chamber formworks.
Wherein, cup takes shape in the top of running channel, is preferably located at the end face central authorities of running channel.Cup leads to the interior Kongxiang of running channel.Running channel is crosswise structure, and this running channel is mainly made up of cross gate integrally and ingate；Ingate is four, they with circular four ends taking shape in cross gate at.The profile size of whole running channel should be able to ensure that the corner arrangement space of four ceramic shell moulds.
Each ceramic shell mould mainly internal layer formwork and outer layer formwork by annular configuration forms, and internal layer formwork is tubular structure, and internal layer formwork and outer layer formwork arrange molding with concentric circular fashion, forms the annular space die cavity of coupling tube shape component design shape between inside and outside layer formwork.Four ceramic shell mould correspondences respectively are molded at the ingate of running channel four end.The top of the internal layer formwork of ceramic shell mould extends to the end face at ingate, and the top of outer layer formwork extends only to the bottom surface at ingate, and ingate should communicate with the annular space die cavity of corresponding ceramic shell mould.Based on above-mentioned and aforementioned injection system structure, the internal diameter of each ingate should be unanimously to the internal diameter of the annular space die cavity of correspondence, the external diameter of ingate should be greater than the external diameter of annular space die cavity, ensure that the axiality of institute's mould casting the most well, and prevents the deformation of foundry goods to greatest extent.
The forming method of the running gate system of above-mentioned pottery, comprises the following steps:
1.. according to design shape (including structure and overall size etc.) and quantity (the i.e. tubular Si Taili number of parts of the wanted molding of this batch of product to be poured into a mould of tubular Si Taili part, the present embodiment is four), prepare correspondence, the die cavity wax-pattern of tubular structure, this die cavity wax-pattern be coupling tubular Si Taili Element Design shape tubular structure wax-pattern, i.e. die cavity wax-pattern be by wax injector according to tubular Si Taili part design shape suppress form；And by wax injector compacting cup wax-pattern and running channel wax-pattern, this running channel wax-pattern is four ends cross wax-patterns respectively in arc-shaped, offers the circular hole concentric with end arc-shaped at four ends of running channel wax-pattern respectively, and aforementioned circular hole is used for connecting die cavity wax-pattern；The press temperature of aforementioned wax injector be usually 60～70 DEG C, pressing pressure be usually 0.8～1.5MPa；
2.. the end face central authorities at running channel wax-pattern are combined in the cup wax-pattern welding prepared, is welded on corresponding respectively for the top of four die cavity wax-patterns at the circular hole of four ends of running channel wax-pattern, makes the circular hole arranged concentric that die cavity wax-pattern is corresponding with on running channel wax-pattern；Wax tree is formed with this；
3.. on step wax tree 2., in the way of mucilage drenches sand, make ceramic case, concrete, the end face (the highest end face of the most whole wax tree) removing cup wax-pattern drenches outside sand process without carrying out mucilage, the all surface of whole wax tree all carries out mucilage and drenches sand process, after the mucilage on wax tree drenches sand molding, then by aforementioned wax tree through dewaxing and calcination process, must have the ceramic running gate system of cavity.
2). the running gate system of said structure and the molding of method institute is placed in resistance furnace, preheats under conditions of temperature is 1200 DEG C and be incubated 2.5 hours, ensureing the homogeneous temperature at each position of running gate system with this.
During running gate system preheats, the ingot casting taking charge of the most vertical 6# alloy is carried out remelting, until it fully melts under conditions of temperature is 1500 DEG C.
After running gate system is preheated, it is drawn off resistance furnace；Being cast in running gate system by the remelting liquation of stellite, concrete, stellite liquation enters running channel from the cup of running gate system, then is dispersed into the annulus type intracavity of ceramic shell mould by running channel, and alloy molten solution from top to bottom fills annular space die cavity again；Alloy molten solution in running gate system is frozen into foundry goods.
3). after the casting solidification in running gate system, the formwork of running gate system is carried out cleaning and removes, and the arrangement from foundry goods tree of the barrel structure castings in institute's mould casting is got off, form tubular Si Taili foundry goods monomer.
Then each tubular Si Taili foundry goods monomer of institute's molding is carried out heat treatment.Concrete, tubular Si Taili foundry goods is placed in heat-treatment furnace, under conditions of temperature is 1200 DEG C, after being incubated 1 hour, Quenching Treatment, cooling medium is water, then air cooling after tubular Si Taili foundry goods being incubated 5 hours under conditions of 980 DEG C, obtains the Si Taili part of tubular.
Need described herein, in above three embodiment, if the axial height of ceramic ring casement chamber formwork is more than 15cm, need ceramic shell mould is carried out isothermal holding.Concrete, length (more than 15cm) according to institute's forming ceramic annular space die cavity formwork, the outer wall of ceramic shell mould arranges the heat-insulation layer that heat-insulating property changes in gradient, this heat-insulating property should be arranged on ceramic shell mould in the way of the most sequentially, the i.e. outer wall bottom at ceramic shell mould arranges the heat-insulation layer that heat insulating ability is weaker, the heat-insulation layer that heat insulating ability is higher is set in the middle part of the outer wall of ceramic shell mould, on the outer wall top of ceramic shell mould, the heat-insulation layer that heat insulating ability is some higher is set, heat-insulating property between each heat-insulation layer is arranged with the graded of gradual change as far as possible.This heat-insulating property set on ceramic shell mould outer wall, in realizing good solidification sequence in heat-insulation layer the most sequentially, beneficially ceramic shell mould, eliminates the rarefaction defect of cast-internal.
If the axial height of ceramic shell mould is in the range of 15cm, it is not necessary to the heat-insulation layer of graded is set on ceramic shell mould outer wall.
Various embodiments above only in order to the present invention to be described, is not intended to limit.Although the present invention being described in detail with reference to the various embodiments described above, it will be understood by those within the art that: the concrete technical scheme in the various embodiments described above still can be modified by it, or wherein portion of techniques feature is carried out equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of technical solution of the present invention.
Claims (8)
1. a tubular Si Taili machine parts'precise casting and molding method, comprises the following steps:
1). according to the design shape of tubular Si Taili part, manufacture the most suitable ceramic shell mould in fusible pattern mode；
2). ceramic shell mould is preheated under conditions of temperature is 900～1200 DEG C and is incubated 1～5 hour, it is ensured that the homogeneous temperature at each position of ceramic shell mould；After stellite ingot casting is melted under conditions of 1400～1500 DEG C, it is cast in preheated ceramic shell mould, is frozen into foundry goods；
3). cleaning formwork；After barrel structure castings is incubated 1～4 hour under conditions of 1000～1200 DEG C, Quenching Treatment, air cooling after then barrel structure castings being incubated 3～6 hours under conditions of 870～980 DEG C.
Tubular Si Taili machine parts'precise casting and molding method the most according to claim 1, it is characterised in that: described ceramic shell mould takes shape in the running gate system of pottery；Described running gate system includes cup (1) and running channel, described cup (1) communicates with running channel, described running channel is provided with at least one ceramic shell mould, described ceramic shell mould mainly internal layer formwork (5) and outer layer formwork (6) by annular configuration forms, and forms the annular space die cavity (4) of coupling tube shape component design shape between inside and outside layer formwork.
Tubular Si Taili machine parts'precise casting and molding method the most according to claim 2, it is characterized in that: described running channel is mainly made up of cross gate (2) integrally and ingate (3), the end face of described cross gate (2) is used for arranging cup (1), the internal diameter of described ingate (3) is unanimously to the internal diameter of annular space die cavity (4), and the external diameter of ingate (3) is more than the external diameter of annular space die cavity (4).
Tubular Si Taili machine parts'precise casting and molding method the most according to claim 2, it is characterised in that: described internal layer formwork (5) is tubular structure, and internal layer formwork (5) and outer layer formwork (6) arrange molding with concentric circular fashion.
Tubular Si Taili machine parts'precise casting and molding method the most according to claim 1 or claim 2, it is characterised in that: on the outer wall of described ceramic shell mould in the way of the most sequentially, it is provided with the heat-insulation layer that heat insulating ability is incremented by.
Tubular Si Taili machine parts'precise casting and molding method the most according to claim 1, it is characterised in that: described stellite liquation is remelting liquation.
7. according to tubular Si Taili machine parts'precise casting and molding method described in claim 1 or 6, it is characterised in that: described stellite liquation is for taking charge of the most vertical 6# alloy molten solution.
Tubular Si Taili machine parts'precise casting and molding method the most according to claim 1, it is characterised in that: the cooling medium of described Quenching Treatment is water.
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| WO1990001384A1 (en) * | 1988-08-02 | 1990-02-22 | Astec Developments Limited | Investment casting process |
| CN101480696A (en) * | 2008-01-11 | 2009-07-15 | 中国科学院金属研究所 | Method for preparing high-temperature alloy thin-section casting |
| CN102019353A (en) * | 2010-12-17 | 2011-04-20 | 西安西工大超晶科技发展有限责任公司 | Precision casting molding method for complex thin-walled member |
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