CN104826995A - Vertical ceramic mold shell and molding method thereof - Google Patents
Vertical ceramic mold shell and molding method thereof Download PDFInfo
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- CN104826995A CN104826995A CN201510269563.5A CN201510269563A CN104826995A CN 104826995 A CN104826995 A CN 104826995A CN 201510269563 A CN201510269563 A CN 201510269563A CN 104826995 A CN104826995 A CN 104826995A
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Abstract
The invention discloses a vertical ceramic mold shell and a molding method thereof. The ceramic mold shell is used for molding monocrystal blades and is erected above a base plate via a bottom crystal selector; a combined joint structure is formed between the base plate and the crystal selector, and a plurality of support columns are arranged between the base plate and the ceramic mold shell and are arranged around the outer periphery of the crystal selector. The vertical ceramic mold shell molding method comprises the following steps: respectively manufacturing the ceramic mold shell with the crystal selector, the ceramic base plate with the joint and a plurality of ceramic support columns; combining the crystal selector of the ceramic mold shell to the joint of the base plate, and bonding the combined part with refractory mortar; arranging the support columns between the base plate at the outer periphery of the crystal selector and the ceramic mold shell in a surrounding way, and bonding the bottom ends of the support columns with the base plate as well as the top ends of the support columns with the ceramic mold shell by using refractory mortar. The vertical ceramic mold shell is supported reliably, stably and firmly on the base plate, and the whole support structure is simple and compact.
Description
Technical field
The present invention relates to the formwork forming technique of accurate founding, the vertical ceramic shell mould that specifically a kind of single crystal blade is shaping, and the forming method of this ceramic shell mould.
Background technology
In order to improve the operating temperature of high-temperature alloy turbine blade, equiax crystal blade is progressively developed into directed column crystal blade and oriented monocrystalline blade by people, wherein oriented monocrystalline blade by raise working temperatures 80 ~ 100 DEG C.
Single crystal blade shaping is mainly realized by spiral crystal selector set bottom ceramic shell mould, and the polycrystal that namely will be entered in ceramic shell mould by spiral crystal selector is produced optionally to grow the monocrystalline realized in ceramic shell mould.
Visible, the shaping of single crystal blade needs the ceramic shell mould relying on band spiral crystal selector.The moulding process of this kind of ceramic shell mould is generally: formed blades wax-pattern (top of blade wax mould have cup wax-pattern, bottom have seeding section wax-pattern) selects brilliant wax-pattern and chassis wax-pattern, electric heating welding cutter is adopted blade wax mould to be combined in the top selecting brilliant wax-pattern, by the central authorities selecting brilliant wax-pattern to be combined in chassis wax-pattern, form wax tree with this; Wax tree is immersed in plastic refractory, make the surface of wax tree apply one deck plastic refractory, in the process, rotate wax tree, to guarantee all angles of wax tree or to need each face of coating can apply slurry uniformly; Adopt and drench sand machine by sand pouring on the wax tree being coated with plastic refractory, the structure that formation plastic refractory and sand are inlayed, reciprocal with this after drying, until form the multi-layer ceramics formwork of required thickness; Must have the ceramic shell mould finished product of cavity finally by operations such as dewaxing, roastings, this ceramic shell mould finished product is used for pouring into a mould single crystal blade in directional solidification processes.
In the forming process of above-mentioned ceramic shell mould, can clearly know: blade wax mould is combined on the wax-pattern of chassis by the brilliant wax-pattern of the screw selecting of variable-diameter structure, this that is, this body structure of crystal selector that the diameter at the thinnest position of whole wax tree only has 6 ~ 10mm(to design determines).But, on wax tree during coating refractory slurry, need to rotate wax tree, to guarantee the uniformity that plastic refractory applies from all angles.In this rotary course of wax tree, because of structural strength problem, very easily tremble, even rupture in the thinnest position of wax tree, thus formation crackle that can be corresponding on the ceramic shell mould of final molding.
We clearly know: in the monocrystalline moulding process of directional solidification, the geometry integrality of growth to ceramic shell mould of monocrystal is extremely responsive, if there is the defects such as crackle in ceramic shell mould, stray crystal will be induced to produce, finally make wanted shaping single crystal product article to meet technical requirement and to scrap.
In sum, the shaping existing ceramic shell mould of single crystal blade such as easily to crack at the incomplete property defect, thus in the monocrystalline moulding process that technical requirement is higher, easy induction stray crystal forming core and growth, finally will affect end product quality and the qualification rate of shaping single crystal blade, reliable, poor practicability.
Summary of the invention
Goal of the invention of the present invention is: for the particularity of directional solidification monocrystalline moulding process and the deficiency of above-mentioned existing ceramic shell mould technology, there is provided a kind of shaping easily and convenient, technical difficulty is little, Forming Quality is reliable, simple and compact structure, can be formed on chassis reliably and the vertical ceramic shell mould of stable support ceramic shell mould, and this ceramic shell mould forming method.
The technical solution adopted in the present invention is: a kind of vertical ceramic shell mould, it is shaping that described ceramic shell mould is used for single crystal blade, this ceramic shell mould is erected at above chassis by the crystal selector of bottom, for to combine connected structure between described chassis and crystal selector, and between chassis and ceramic shell mould, being provided with many support columns, these support columns are around being arranged in crystal selector periphery.
Described support column is arranged in the centroclinal mode in upper end.
Above-mentioned vertical ceramic shell mould forming method, comprises the following steps:
1). the blade shape according to design makes blade wax mould and selects brilliant wax-pattern; Make chassis and support column, described chassis central authorities are provided with adapter that is protruding, hollow, and described support column is many;
2). by blade wax mould and select brilliant wax-pattern combine, the mode that the wax tree formed drenches sand with mucilage makes ceramic shell mould, through dewaxing and roasting forming ceramic formwork;
3). the chassis in step 1) is set level, by step 2) in the crystal selector of ceramic shell mould be combined on the adapter on chassis, combination place adopts refractory wass bonding;
4). by the support column prepared in step 1) around between the chassis being arranged in crystal selector periphery and ceramic shell mould, and adopt refractory wass by bonding with chassis for the bottom of support column, top is bonding with ceramic shell mould.
The top of described blade wax mould has cup wax-pattern, bottom has seeding section wax-pattern.
Or above-mentioned vertical ceramic shell mould forming method, comprises the following steps:
1). make blade wax mould according to the blade shape of design, select brilliant wax-pattern, chassis wax-pattern, support wax-pattern and adapter wax-pattern; Described support wax-pattern is many;
2). by blade wax mould and select brilliant wax-pattern to combine, the mode that the wax tree formed drenches sand with mucilage makes ceramic shell mould, through dewaxing and roasting forming ceramic formwork; Chassis wax-pattern, adapter wax-pattern and support wax-pattern are combined, described adapter wax-pattern is located at chassis wax-pattern central authorities, described support wax-pattern is around the periphery being arranged in adapter wax-pattern and support the top of wax-pattern higher than adapter wax-pattern, the chassis that the mode that the wax tree formed drenches sand with mucilage is made into one, adapter and support column;
3). by step 2) in chassis set level, by step 2) in the crystal selector of ceramic shell mould be combined on the adapter on chassis, combination place adopts refractory wass bonding and adopts refractory wass by bonding with ceramic shell mould for the top of support column.
The top of described blade wax mould has cup wax-pattern, bottom has seeding section wax-pattern.
The invention has the beneficial effects as follows:
1. ceramic shell mould of the present invention (blade formwork) is connected in a joint manner with chassis, thus make ceramic shell mould and chassis can divide body formed, this effectively prevent in global formation process, and because of wax tree structural strength, two ends are overweight and problem that is that cause wax tree waist to damage (even rupture) occurs not, in other words, and then make the shaping more light, convenient of whole ceramic shell mould, reliable and efficiently reduce the shaping technical difficulty of ceramic shell mould, reliable in quality, the qualification rate of institute's forming ceramic formwork are high, effectively can meet the technical requirement of directional solidification monocrystalline moulding process;
2. many support columns set between the bottom of ceramic shell mould of the present invention (blade formwork) and chassis, reliable, stable support is formed on chassis to the ceramic shell mould erect, this supporting construction not only can not affect the forming operation of ceramic shell mould, and impulsive force and the static pressure of alloy melt cast can be born, effectively prevent the fracture of ceramic shell mould and spilling of melt, and then ensure that single crystal blade carrying out smoothly in shell processed, cast and process of setting; Whole supporting construction is simple and compact, can be formed reliably and stable support ceramic shell mould on chassis; Meanwhile, this supporting construction effectively prevent the obstruction of the radiant heat transfer to ceramic shell mould middle and upper part, and make it not affect the crystal growth condition of directional solidification blade portions, reliability is high, practical.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Fig. 1 is a kind of structural representation of ceramic shell mould of the present invention.
Fig. 2 is the schematic diagram of the concrete forming step 1 of ceramic shell mould shown in Fig. 1.
Fig. 3 is the schematic diagram of the concrete forming step 2 of ceramic shell mould shown in Fig. 1.
Fig. 4 is the schematic diagram of the concrete forming step 3 of ceramic shell mould shown in Fig. 1.
Fig. 5 is the schematic diagram of the concrete forming step 4 of ceramic shell mould shown in Fig. 1.
Fig. 6 is the schematic diagram of the concrete forming step 5 of ceramic shell mould shown in Fig. 1.
Fig. 7 is the another kind of structural representation of ceramic shell mould of the present invention.
Fig. 8 is the schematic diagram of the concrete forming step 1 of ceramic shell mould shown in Fig. 7.
Fig. 9 is the schematic diagram of the concrete forming step 2 of ceramic shell mould shown in Fig. 7.
Figure 10 is the schematic diagram of the concrete forming step 3 of ceramic shell mould shown in Fig. 7.
Figure 11 is the schematic diagram of the concrete forming step 4 of ceramic shell mould shown in Fig. 7.
Figure 12 is the schematic diagram of the concrete forming step 5 of ceramic shell mould shown in Fig. 7.
Code name implication in figure: 1-chassis; 2-crystal selector; 3-ceramic shell mould; 4-support column; 5-adapter; 6-cup wax-pattern; 7-blade wax mould; 8-seeding section wax-pattern; 9-select brilliant wax-pattern; 10-chassis wax-pattern; 11-support wax-pattern; 12-adapter wax-pattern.
Detailed description of the invention
embodiment 1
Shown in Figure 1, a kind of vertical ceramic shell mould, this ceramic shell mould is used for the moulding by casting of single crystal blade, especially large-scale single crystal blade in directional solidification processes.Foregoing ceramic formwork 3 has the blade die cavity of corresponding design blade shape, be provided with crystal selector 2 in the bottom of ceramic shell mould 3, ceramic shell mould 3 and crystal selector 2 are formed in one structure.Foregoing ceramic formwork 3 is erected at above chassis 1 by the crystal selector 2 of bottom, concrete, the central authorities on chassis 1 are provided with adapter 5 that is protruding, hollow, be the connected structure of bonding combination between the adapter 5 on chassis 1 and the die cavity of crystal selector 2, namely chassis 1 and ceramic shell mould 3 are a point body formed combining structure.In order to the setting ensureing that ceramic shell mould 3 can be reliable, stable on chassis 1, between chassis 1 and the bottom of ceramic shell mould 3, be provided with the many concrete quantity of support column 4(require depending on supporting), these support columns 4 around the periphery being arranged in crystal selector 2, the bottom combination bonding with chassis 1 of every root support column 4, top and bonding combination bottom ceramic shell mould 3.The mode that aforementioned every root support column 4 tilts with upper end centripetal (referring to the axle center that ceramic shell mould 3 is erect) is peripheral around being arranged in crystal selector 2, every root support column 4 is generally 40 ~ 90 ° (when for 90 ° at the One On The Chassis angle of inclination, support column 4 is erect), such as 40 °, 55 ° or 70 ° etc.
The thickness on above-mentioned chassis 1 is generally 5 ~ 10mm.Above-mentioned every root support column 4 typically have a diameter from 5 ~ 30mm.This kind of value, is conducive to the radiant heat transfer in directional solidification processes.
The forming method of above-mentioned vertical ceramic shell mould mainly comprises the following steps:
1). adopt wax injector, the blade shape according to design makes blade wax mould 7 and selects brilliant wax-pattern 9, and wherein, the top of blade wax mould 7 has cup wax-pattern 6, bottom has seeding section wax-pattern 8; Make chassis 1(and such as adopt pressure core machine press ceramic chassis) and support column 4, in the present embodiment, chassis 1 and support column 4 are respectively forming process of ceramics, wherein, the central authorities on chassis 1 are provided with hollow described in adapter 5(that is protruding, hollow and refer to that the bottom surface on chassis 1 is through hole to adapter 5 end face), the external diameter that the hollow diameters of this adapter 5 is corresponding, coupling selects the die cavity portion casing forming of brilliant wax-pattern 9, support column 4 is many, and the length of every root support column 4 is greater than the height selecting brilliant wax-pattern 9; This step is shown in Figure 2;
2). adopt electric welding cutter, cup wax-pattern 6 is welded on the top of blade wax mould 7, seeding section wax-pattern 8 is welded on the bottom of blade wax mould 7, again by whole blade wax mould 7(with cup wax-pattern 6 and seeding section wax-pattern 8) and select brilliant wax-pattern 9 to combine, concrete, the bottom welding of the seeding section wax-pattern 8 of blade wax mould 7 is combined in and selects the spiral reducing column top of brilliant wax-pattern 9 (the two specifically combines angle and requires depending on the growth of monocrystalline), shown in Figure 3; The wax tree of aforementioned formation makes ceramic shell mould in the mode of mucilage pouring sand, shown in Figure 4; The mixture of wax tree and ceramic shell mould is processed through techniques such as dewaxing and roastings, the ceramic shell mould 3 of blade die cavity must be had eventually, shown in Figure 5;
3). the chassis 1 in step 1) is set level, the crystal selector 2 of ceramic shell mould in step 23 is sleeved on the adapter 5 on chassis 1, concrete, by the die cavity combined set of crystal selector 2 bottom ceramic shell mould 3 on the adapter 5 on chassis 1, namely adapter 5 embeds the die cavity of crystal selector 2, adopt refractory cement by bonding for the combination joining place between crystal selector 2 and adapter 5, sealing again, shown in Figure 5;
4). by the support column 4 prepared in step 1) around between the chassis 1 being arranged in crystal selector 2 periphery and ceramic shell mould 3, and adopt refractory cement by bonding with chassis 1 for the bottom of every root support column 4, top is bonding with bottom ceramic shell mould 3.
The vertical ceramic shell mould of monocrystalline moulding by casting in directional solidification processes is obtained eventually with this, shown in Figure 1.
embodiment 2
Shown in Figure 7, a kind of vertical ceramic shell mould, this ceramic shell mould is used for the moulding by casting of single crystal blade, especially large-scale single crystal blade in directional solidification processes.Foregoing ceramic formwork 3 has the blade die cavity of corresponding design blade shape, be provided with crystal selector 2 in the bottom of ceramic shell mould 3, ceramic shell mould 3 and crystal selector 2 are formed in one structure.Foregoing ceramic formwork 3 is erected at above chassis 1 by the crystal selector 2 of bottom, concrete, the central authorities on chassis 1 are provided with adapter 5 that is protruding, hollow, be the connected structure of bonding combination between the adapter 5 on chassis 1 and the die cavity of crystal selector 2, namely chassis 1 and ceramic shell mould 3 are a point body formed combining structure.In order to the setting ensureing that ceramic shell mould 3 can be reliable, stable on chassis 1, between chassis 1 and the bottom of ceramic shell mould 3, be provided with the many concrete quantity of support column 4(require depending on supporting), these support columns 4 are around the periphery being arranged in crystal selector 2, the bottom of every root support column 4 is formed in one with chassis 1, top and bonding combination bottom ceramic shell mould 3, as can be seen here, chassis 1, adapter 5 and support column 4 are formed in one structure.The mode that every root support column 4 of shaping vertical ceramic shell mould tilts with upper end centripetal (referring to the axle center that ceramic shell mould 3 is erect) is peripheral around being arranged in crystal selector 2, every root support column 4 is generally 40 ~ 90 ° (when for 90 ° at the One On The Chassis angle of inclination, support column 4 is erect), such as 40 °, 55 ° or 70 ° etc.
The thickness on above-mentioned chassis 1 is generally 5 ~ 10mm.Above-mentioned every root support column 4 typically have a diameter from 5 ~ 30mm.This kind of value, is conducive to the radiant heat transfer in directional solidification processes.
The forming method of above-mentioned vertical ceramic shell mould mainly comprises the following steps:
1). adopt wax injector, make blade wax mould 7 according to the blade shape of design, select brilliant wax-pattern 9, chassis wax-pattern 10, support wax-pattern 11 and adapter wax-pattern 12, wherein, the top of blade wax mould 7 has cup wax-pattern 6, bottom has seeding section wax-pattern 8, the diameter that the diameter of this adapter wax-pattern 12 is corresponding, coupling selects brilliant wax-pattern 9, support wax-pattern 11 and be many, the length that every root supports wax-pattern 11 is greater than the height selecting brilliant wax-pattern 9; This step is shown in Figure 8;
2). adopt electric welding cutter, cup wax-pattern 6 is welded on the top of blade wax mould 7, seeding section wax-pattern 8 is welded on the bottom of blade wax mould 7, again by whole blade wax mould 7(with cup wax-pattern 6 and seeding section wax-pattern 8) and select brilliant wax-pattern 9 to combine, concrete, the bottom welding of the seeding section wax-pattern 8 of blade wax mould 7 is combined in and selects the spiral reducing column top of brilliant wax-pattern 9 (the two specifically combines angle and requires depending on the growth of monocrystalline), shown in Figure 9, the wax tree (blade wax tree) of aforementioned formation makes ceramic shell mould in the mode of mucilage pouring sand, shown in Figure 10, the mixture of wax tree and ceramic shell mould is processed through techniques such as dewaxing and roastings, the ceramic shell mould 3 of blade die cavity must be had eventually, shown in Figure 11,
Adopt electric welding cutter, adapter wax-pattern 12 is welded on the central authorities of chassis wax-pattern 10, the periphery that wax-pattern 11 is welded on adapter wax-pattern 12 is supported by many, these are made to support wax-pattern 11 around adapter wax-pattern 12, and every root supports the top of wax-pattern 11 higher than adapter wax-pattern 12, concrete every root supports the tilt layout of wax-pattern 11 on chassis wax-pattern 10, should in conjunction with pre-designed consideration, guarantee that the shaping chassis 1 of institute can effectively can combine with institute forming ceramic formwork 3, with this by chassis wax-pattern 10, support wax-pattern 11 and adapter wax-pattern 12 are combined, shown in Figure 9, the chassis 1 that the mode that the wax tree (chassis wax tree) of aforementioned formation drenches sand with mucilage is made into one, adapter 5 and support column 4, concrete, plastic refractory and fire-resistant sand should be arranged on the end face of chassis wax-pattern 10, the circumference (end face is not arranged) of adapter wax-pattern 12, support the whole profile of wax-pattern 11, with this shaping the One On The Chassis adapter 5 hollow structure that is axially extending bore, shown in Figure 10, the mixture of aforementioned wax tree (chassis wax tree) and ceramic shell mould (ceramic shell mould on the wax tree of chassis) is processed through techniques such as dewaxing and roastings, obtain the chassis 1 of one eventually, adapter 5 and support column 4, shown in Figure 11,
3). by step 2) in chassis 1 set level, the crystal selector 2 of ceramic shell mould in step 23 is sleeved on the adapter 5 on chassis 1, concrete, by the die cavity combined set of crystal selector 2 bottom ceramic shell mould 3 on the adapter 5 on chassis 1, namely adapter 5 embeds the die cavity of crystal selector 2, adopt refractory cement by bonding for the combination joining place between crystal selector 2 and adapter 5, sealing again, shown in Figure 12; After the crystal selector 2 of ceramic shell mould 3 and the One On The Chassis adapter 5 are combined, the One On The Chassis support column 4 top is just in time corresponding or be connected in the bottom outer wall of ceramic shell mould 3, adopts refractory cement that the top of support column 4 is bonding with ceramic shell mould 3.
The vertical ceramic shell mould of monocrystalline moulding by casting in directional solidification processes is obtained eventually with this, shown in Figure 7.
Each embodiment is only in order to illustrate the present invention above, is not intended to limit.Although with reference to the various embodiments described above to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the concrete technical scheme in the various embodiments described above, or carries out equivalent replacement to wherein portion of techniques feature; 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 (6)
1. a vertical ceramic shell mould, it is shaping that described ceramic shell mould is used for single crystal blade, this ceramic shell mould (3) is erected at top, chassis (1) by the crystal selector (2) of bottom, it is characterized in that: for combine connected structure between described chassis (1) and crystal selector (2), and being provided with many support columns (4) between chassis (1) and ceramic shell mould (3), these support columns (4) are peripheral around being arranged in crystal selector (2).
2. vertical ceramic shell mould according to claim 1, is characterized in that: described support column (4) is arranged in the centroclinal mode in upper end.
3. a vertical ceramic shell mould forming method described in claim 1 or 2, comprises the following steps:
1). the blade shape according to design makes blade wax mould (7) and selects brilliant wax-pattern (9); Make chassis (1) and support column (4), described chassis (1) central authorities are provided with adapter (5) that is protruding, hollow, and described support column (4) is many;
2). by blade wax mould (7) with select brilliant wax-pattern (9) to combine, the mode that the wax tree formed drenches sand with mucilage makes ceramic shell mould, through dewaxing and roasting forming ceramic formwork (3);
3). the chassis (1) in step 1) is set level, by step 2) in the crystal selector (2) of ceramic shell mould (3) be combined on the adapter (5) of chassis (1), combination place adopts refractory wass bonding;
4). by the support column prepared in step 1) (4) around being arranged between the peripheral chassis (1) of crystal selector (2) and ceramic shell mould (3), and adopt that refractory wass is bonding with chassis (1) by the bottom of support column (4), top is bonding with ceramic shell mould (3).
4. vertical ceramic shell mould forming method according to claim 3, is characterized in that: the top of described blade wax mould (7) has cup wax-pattern (6), bottom has seeding section wax-pattern (8).
5. a vertical ceramic shell mould forming method described in claim 1 or 2, comprises the following steps:
1). make blade wax mould (7) according to the blade shape of design, select brilliant wax-pattern (9), chassis wax-pattern (10), support wax-pattern (11) and adapter wax-pattern (12); Described support wax-pattern (11) is many;
2). by blade wax mould (7) with select brilliant wax-pattern (9) to combine, the mode that the wax tree formed drenches sand with mucilage makes ceramic shell mould, through dewaxing and roasting forming ceramic formwork (3); Chassis wax-pattern (10), adapter wax-pattern (12) and support wax-pattern (11) are combined, described adapter wax-pattern (12) is located at chassis wax-pattern (10) central authorities, described support wax-pattern (11) around be arranged in the periphery of adapter wax-pattern (12) and the top supporting wax-pattern (11) higher than adapter wax-pattern (12), the wax tree formed drenches chassis (1) that the mode of sand is made into one, adapter (5) and support column (4) with mucilage;
3). by step 2) in chassis (1) set level, by step 2) in the crystal selector (2) of ceramic shell mould (3) be combined on the adapter (5) of chassis (1), combination place adopts refractory wass bonding and adopts refractory wass that the top of support column (4) is bonding with ceramic shell mould (3).
6. vertical ceramic shell mould forming method according to claim 5, is characterized in that: the top of described blade wax mould (7) has cup wax-pattern (6), bottom has seeding section wax-pattern (8).
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| CN107574472A (en) * | 2017-10-31 | 2018-01-12 | 泰州市金鹰精密铸造有限公司 | A kind of improved high-efficiency Z-type crystal selector |
| CN107574473A (en) * | 2017-10-31 | 2018-01-12 | 泰州市金鹰精密铸造有限公司 | A kind of Z-type crystal selector |
| CN109940131A (en) * | 2019-03-26 | 2019-06-28 | 中国科学院金属研究所 | A method of reducing the formation of single crystal super alloy blade tenon internal defect defect |
| CN110405146A (en) * | 2019-08-30 | 2019-11-05 | 中国航发动力股份有限公司 | A kind of device and method for reinforcing crystal selector formwork |
| CN110560665A (en) * | 2019-09-24 | 2019-12-13 | 天锜精密机械(昆山)有限公司 | Stable upper suction shell mold for casting |
| CN111299511A (en) * | 2020-04-03 | 2020-06-19 | 北航（四川）西部国际创新港科技有限公司 | Preparation method of single crystal high-temperature alloy thin-wall casting |
| CN114658411A (en) * | 2022-03-17 | 2022-06-24 | 中国石油大学(华东) | Device and method for evaluating integrity of shaft after high-pressure oil and gas well pipe column is blocked |
| EP4180147A1 (en) * | 2021-11-12 | 2023-05-17 | General Electric Company | Method and apparatus for supporting wax pattern during investment casting |
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| CN110560665A (en) * | 2019-09-24 | 2019-12-13 | 天锜精密机械(昆山)有限公司 | Stable upper suction shell mold for casting |
| CN110560665B (en) * | 2019-09-24 | 2021-06-15 | 天锜精密机械(昆山)有限公司 | Stable upper suction shell mold for casting |
| CN111299511A (en) * | 2020-04-03 | 2020-06-19 | 北航（四川）西部国际创新港科技有限公司 | Preparation method of single crystal high-temperature alloy thin-wall casting |
| CN111299511B (en) * | 2020-04-03 | 2021-02-09 | 北航（四川）西部国际创新港科技有限公司 | Preparation method of single crystal high-temperature alloy thin-wall casting |
| EP4180147A1 (en) * | 2021-11-12 | 2023-05-17 | General Electric Company | Method and apparatus for supporting wax pattern during investment casting |
| US11738386B2 (en) | 2021-11-12 | 2023-08-29 | General Electric Company | Apparatus for supporting wax pattern during investment casting |
| CN114658411A (en) * | 2022-03-17 | 2022-06-24 | 中国石油大学(华东) | Device and method for evaluating integrity of shaft after high-pressure oil and gas well pipe column is blocked |
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Application publication date: 20150812 |