CN103861999A - Method for improving bottom deformation of multi-cavity ceramic die shell in directional solidification process - Google Patents
Method for improving bottom deformation of multi-cavity ceramic die shell in directional solidification process Download PDFInfo
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- CN103861999A CN103861999A CN201410115644.5A CN201410115644A CN103861999A CN 103861999 A CN103861999 A CN 103861999A CN 201410115644 A CN201410115644 A CN 201410115644A CN 103861999 A CN103861999 A CN 103861999A
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Abstract
The invention discloses a method for improving bottom deformation of a multi-cavity ceramic die shell in a directional solidification process. The method comprises the following steps: 1, respectively manufacturing a plurality of casting wax dies according to designed shapes of castings, manufacturing a wax die base disc which is used for supporting the casting wax dies and provided with a convex disc at the top, arranging a centre strut on the convex disc, annually distributing the casting wax dies in a reserved space in the wax die base disc by taking the center strut as a center, and connecting the casting wax dies to a common pouring gate in the top of the center strut through respective cross gates; 2, manufacturing the ceramic die shell by using the assembled wax dies according to a precision casting method to form the multi-cavity ceramic die shell with a concave platform on the bottom surface; and 3, placing the multi-cavity ceramic die shell in a vacuum directional solidification furnace and closely contacting the annular bottom surface of the ceramic die shell with the surface of a water cooling disc. By forming an allowably-deformable concave cavity in the bottom of the multi-cavity ceramic die shell, the annular bottom surface corresponding to a pouring cavity in the multi-cavity ceramic die shell is closely contacted with the water cooling disc, thereby avoiding a series of problems caused by the pouring missing condition.
Description
Technical field
The present invention relates to directional solidification technique, specifically a kind of method of improving cavity ceramic shell mould deformation of bottom in directional solidification processes.
Background technology
Directional solidification refers to sets up the thermograde of specific direction, a kind of casting technique that molten alloy is solidified along the direction contrary with hot-fluid crystalline orientation as requested in fired mold precision casting type shell, in directional solidification processes, forming die shell-the ceramic shell mould of foundry goods is placed on to formation temperature gradient on the vacuum oriented aqueous cold plate solidifying in stove, make to pour into molten alloy in ceramic shell mould along with the thermograde of specific direction is carried out directional solidification, thereby obtain the foundry goods that requires crystallization.
In actual production process, in order to enhance productivity, conventionally can adopt the formwork of a multi-cavity mold to carry out casting pouring, adopt the ceramic shell mould of multiple die cavities to carry out the casting pouring of identical or different shape (being generally same shape) simultaneously.The moulding decomposition process of this cavity ceramic shell mould is shown in Figure 1, make respectively multiple casting wax moulds 1 according to the foundry goods shape of design, and the wax-pattern chassis 3 that makes these casting wax moulds 1 of support, centered by the centre strut 2 of these casting wax moulds 1 on wax-pattern chassis 3, hoop is arranged in the end face outer rim place on wax-pattern chassis 3, these casting wax moulds 1 connect common cast gate 9 by cross gate 10 separately, and centre strut 2 upper ends on wax-pattern chassis 3 extend to cast gate 9 places (as shown in Figure 1a); By this tree-like wax-pattern is made to ceramic shell mould 4, form cavity ceramic shell mould 4, these die cavity 6 same die bodys of enjoying (as shown in Fig. 1 b and Fig. 1 c).Because the die body chassis diameter of cavity ceramic shell mould 4 is conventionally very large, and there is very big difference in the structure at the centre on chassis and outer rim position, in directional solidification processes, be placed on cavity ceramic shell mould 4 on aqueous cold plate 5 because of after being heated in sintering and warm, can there is relative deformation phenomenon in its bottom outer rim, concrete deformation is, the thick abundant centre strut 2 of cavity ceramic shell mould 4 is to lower convexity, press closer aqueous cold plate 5, the bottom outer rim of cavity ceramic shell mould 4 is upturned, thereby miniature pyramidal structure has been formed on the bottom that makes cavity ceramic shell mould 4, become out-of-flatness (as shown in Fig. 1 c), this out-of-flatness is exposed die cavity 6 bottom openings at cavity ceramic shell mould 4 outer rim places, aqueous cold plate 5 cannot carry out shutoff to it, thereby cause the high temperature alloy of melting along with " watering Lou phenomenon " occurs the opening of die cavity 6 bottoms, it has not only caused the raw-material waste of casting pouring, affect production efficiency, and more seriously, water the high temperature alloy spilling and can damage the vacuum oriented stove that solidifies involving great expense, cause huge economic loss.
For above-mentioned technical problem, the measure of generally taking in industry is at present, by the cavity ceramic shell mould of moulding pack into vacuum oriented solidify stove before, milled processed is carried out in centre to its bottom, not only labor strength is large for this, operating efficiency is low, and area, the degree of depth and the flatness of grinding depend on that workman's subjective experience judges, lacks scientific and reasonable solution to a great extent.
Summary of the invention
The object of the invention is to: the particularity of applying in directional solidification processes for above-mentioned cavity ceramic shell mould, with and the deformation of bottom problem that exists in directional solidification processes, a kind of simple, reliable and practical, method of effectively improving cavity ceramic shell mould deformation of bottom in directional solidification processes is provided.
The technical solution used in the present invention is that a kind of method of improving cavity ceramic shell mould deformation of bottom in directional solidification processes, comprises following order step:
1). make respectively multiple casting wax moulds according to the foundry goods shape of design, and the wax-pattern chassis that makes these casting wax moulds of support, the end face core on this wax-pattern chassis be the protruding dish that raises up, outer rim annulus part for the casting wax mould of arranging, protruding dish is provided with the centre strut of upwards holding up; By multiple casting wax moulds, centered by pillar, hoop is arranged in the annulus part on wax-pattern chassis, and the common cast gate on cross gate connection centre strut top is separately passed through at these casting wax mould tops;
2). the wax-pattern of assembling by step 1) is made ceramic shell mould according to the method for hot investment casting, drench and in sand process, the bottom on wax-pattern chassis and side are carried out peace and quiet at sticky oar, through dewaxing and roasting, form cavity ceramic shell mould, bottom center's part of this cavity ceramic shell mould is indent platform; The centre strut cavity of cavity ceramic shell mould is stopped up from top, and while preventing from pouring into a mould, molten metal enters;
3). cavity ceramic shell mould is placed on to vacuum oriented solidifying in stove, makes annular bottom surface and the vacuum oriented aqueous cold plate surface close contact solidifying in stove of ceramic shell mould.
Protruding dish on described wax-pattern chassis is highly 0.5～5mm.
Protruding dish outer rim on described wax-pattern chassis and the nearest spacing >=10mm of casting wax mould bottom surface.
Step 2) in the annular bottom surface of cavity ceramic shell mould of moulding carry out milled processed, until reach and the vacuum oriented formation state that solidifies aqueous cold plate surface close contact in stove.
The invention has the beneficial effects as follows: above-mentioned simple method forms the indent die cavity that allows distortion by the bottom at cavity ceramic shell mould, the annular bottom surface that exchanges on cavity ceramic shell mould corresponding cast die cavity for and aqueous cold plate are reliably, closely contact, thereby the series of problems of effectively avoiding " watering Lou phenomenon " to bring, the production cost of enterprise is effectively controlled, significantly improve the productivity effect of enterprise, practical.
Brief description of the drawings
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Fig. 1 is the moulding decomposition process schematic diagram of existing cavity ceramic shell mould.
Fig. 2 is moulding decomposition process schematic diagram of the present invention.
Detailed description of the invention
Referring to Fig. 2: the present invention is the method for improving cavity ceramic shell mould deformation of bottom in directional solidification processes, the indent die cavity that allows distortion is formed on the bottom that the method is based on cavity ceramic shell mould, exchanges on cavity ceramic shell mould the mentality of designing that the annular bottom surface of corresponding cast die cavity reliably, closely contacts with the vacuum oriented aqueous cold plate end face that solidifies stove for and proposes.The present invention specifically comprises following order step:
1). make respectively multiple casting wax moulds 1 according to the foundry goods shape of design, and the wax-pattern chassis 3 that makes these casting wax moulds 1 of support, this wax-pattern chassis 3 is circular discs, be provided with the circular protruding dish 7 raising up at the end face core on wax-pattern chassis 3, this protruding dish 7 is the mode moulding with mold pressing or stickup wax disk(-sc), protruding dish 7 is 0.5～5mm in the height of projection scope of wax-pattern chassis 3 end faces, for example 0.9mm, 2mm, 2.7mm or 4mm etc., require the end face annulus part (being position between protruding dish 7 outer rims and the edge on wax-pattern chassis 3) on wax-pattern chassis 3 to reserve the space of the casting wax mould 1 of arranging, arrange on wax-pattern chassis 3 for the ease of casting wax mould 1, and the structural strength of raising subsequent forming ceramic shell mould 4, be provided with the centre strut 2 of upwards holding up at the center of protruding dish 7 end faces, it is cast gate wax-pattern that the top of center stand column 2 is provided with cast gate 9(with bonding way), by multiple casting wax moulds 1 centered by centre strut 2, hoop is arranged in the headspace on wax-pattern chassis 3, concrete arrangement mode is selected bonding way conventionally, these casting wax moulds 1 are erect on wax-pattern chassis 3, casting wax mould 1 pitch density on wax-pattern chassis 3 is distributed according to the reasonable quantity of arranging, preferably require casting wax mould 1 hoop on wax-pattern chassis 3 evenly to arrange, the top of these casting wax moulds 1 is running channel wax-pattern by cross gate 10(separately) be connected to the common cast gate 9 at centre strut 2 tops, on subsequent forming ceramic shell mould 4, can realize like this cast of all die cavities by a cast gate, for the ease of ceramic shell mould moulding follow-up on wax-pattern and guarantee the formwork thickness of forming ceramic formwork bottom, nearest spacing >=the 10mm of casting wax mould 1 bottom surface that requires protruding dish 7 outer rims on wax-pattern chassis 3 and arrange, for example 12mm, 15mm etc. (this step is as shown in Figure 2 a),
2). with the wax-pattern (being centre strut 2, casting wax mould 1, cross gate 10, cast gate 9 etc.) of step 1) assembling, make ceramic shell mould 4 according to the method for hot investment casting (sticky oar drenches the operations such as sand), drench and in sand process, the bottom on wax-pattern chassis 3 and side are carried out peace and quiet at sticky oar, require circumferential side wall and the bottom surface on wax-pattern chassis 3 to keep clean, be that the circumferential side wall on wax-pattern chassis 3 and bottom surface are in complete naked state, so that dewax and form smooth formwork bottom surface, alleviate the difficulty (this step as shown in Figure 2 b) of follow-up milled processed; By ceramic shell mould being dewaxed, is burnt residual wax processing, the final cavity ceramic shell mould 4 with multiple interior skies that forms, bottom center's part of this cavity ceramic shell mould 4 has the indent platform (being indent die cavity 8) of coupling wax-pattern chassis 3 epirelief dish 7 height, and the bottom surface of cavity ceramic shell mould 4 has formed annular bottom surface; To the annular bottom surface of this cavity ceramic shell mould 4 milled processed a little, can reach with vacuum oriented and solidify that 5 surfaces of aqueous cold plate in stove are reliable, the formation state of close contact, this milled processed is compared the milled processed of traditional whole bottom surface, milling area and thickness reduce, position to be ground is easy to confirm, not only workman's labour intensity significantly alleviates, and the flatness of ceramic shell mould bottom surface is easy to ensure; The centre strut cavity (wax-pattern dissolves rear formation) of cavity ceramic shell mould 4 is stopped up from top, and while preventing from pouring into a mould, molten metal enters:
3). cavity ceramic shell mould 4 is placed on to vacuum oriented solidifying in stove, making annular bottom surface and the vacuum oriented aqueous cold plate 5(solidifying in stove of cavity ceramic shell mould 4 is water-cooled copper dish) surface is reliably, closely contact, by aqueous cold plate 5 by the 6 bottom opening shutoff of the die cavity at cavity ceramic shell mould 4 outer rim places, even if the bottom of cavity ceramic shell mould 4 is at sintering, distortion after being heated in warm, the predeformation indent die cavity 8 that its bottom forms has abundant stroke space protruding under centre strut part, thereby annular bottom surface and the aqueous cold plate 5 of guaranteeing corresponding cast die cavity 6 on cavity ceramic shell mould 4 are reliable, closely contact (this step as shown in Figure 2 c).
Claims (4)
1. improve a method for cavity ceramic shell mould deformation of bottom in directional solidification processes, comprise following order step:
1). make respectively multiple casting wax moulds according to the foundry goods shape of design, and the wax-pattern chassis that makes these casting wax moulds of support, the end face core on this wax-pattern chassis be the protruding dish that raises up, outer rim annulus part for the casting wax mould of arranging, protruding dish is provided with the centre strut of upwards holding up; By multiple casting wax moulds, centered by pillar, hoop is arranged in the annulus part on wax-pattern chassis, and the common cast gate on cross gate connection centre strut top is separately passed through at these casting wax mould tops;
2). the wax-pattern of assembling by step 1) is made ceramic shell mould according to the method for hot investment casting, drench and in sand process, the bottom on wax-pattern chassis and side are carried out peace and quiet at sticky oar, through dewaxing and roasting, form cavity ceramic shell mould, bottom center's part of this cavity ceramic shell mould is indent platform; The centre strut cavity of cavity ceramic shell mould is stopped up from top, and while preventing from pouring into a mould, molten metal enters;
3). cavity ceramic shell mould is placed on to vacuum oriented solidifying in stove, makes annular bottom surface and the vacuum oriented aqueous cold plate surface close contact solidifying in stove of ceramic shell mould.
2. the method for improving according to claim 1 cavity ceramic shell mould deformation of bottom in directional solidification processes, is characterized in that: the protruding dish on described wax-pattern chassis is highly 0.5～5mm.
3. according to the method for improving cavity ceramic shell mould deformation of bottom in directional solidification processes described in claim 1 or 2, it is characterized in that: the protruding dish outer rim on described wax-pattern chassis and the nearest spacing >=10mm of casting wax mould bottom surface.
4. improve according to claim 1 the method for cavity ceramic shell mould deformation of bottom in directional solidification processes, it is characterized in that: step 2) in the annular bottom surface of cavity ceramic shell mould of moulding carry out milled processed, until reach and the vacuum oriented formation state that solidifies aqueous cold plate surface close contact in stove.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104289674A (en) * | 2014-10-24 | 2015-01-21 | 东方电气集团东方汽轮机有限公司 | Precision casting method for column crystal guide vanes of gas turbine |
| CN104368764A (en) * | 2014-11-14 | 2015-02-25 | 西北工业大学 | Process bar of precision casting single-crystal turbine blade model |
| CN104399894A (en) * | 2014-12-15 | 2015-03-11 | 东方电气集团东方汽轮机有限公司 | Wax tree structure applied to formation of high-temperature alloy single-crystal guide vane |
| CN104826995A (en) * | 2015-05-25 | 2015-08-12 | 东方电气集团东方汽轮机有限公司 | Vertical ceramic mold shell and molding method thereof |
| CN105081220A (en) * | 2015-09-25 | 2015-11-25 | 东方电气集团东方汽轮机有限公司 | Multi-cavity ceramic die shell and forming method of ceramic die shell |
| CN105382197A (en) * | 2015-11-27 | 2016-03-09 | 株洲中航动力精密铸造有限公司 | Anti-deformation embedded block and forming method for mold case with flat bottom plate |
| CN105798230A (en) * | 2016-04-26 | 2016-07-27 | 东方电气集团东方汽轮机有限公司 | Wax mould module for casting gas turbine blades and assembling method thereof |
| CN106513634A (en) * | 2016-12-16 | 2017-03-22 | 上海华培动力科技有限公司 | Wax mold structure for high-temperature resisting alloy vacuum suction casting |
| CN107877807A (en) * | 2017-11-10 | 2018-04-06 | 中国航发动力股份有限公司 | A kind of directional solidification casting crystallization chassis manufacture method |
| CN108057851A (en) * | 2017-12-25 | 2018-05-22 | 霍山县忠福机电科技有限公司 | A kind of new casting method and device |
| CN110293216A (en) * | 2019-07-04 | 2019-10-01 | 深圳市万泽中南研究院有限公司 | It is a kind of for improve orientation or single crystal casting quality transition disc and consolidation furnace |
| CN112157223A (en) * | 2020-09-25 | 2021-01-01 | 深圳市万泽中南研究院有限公司 | Directional solidification casting method and pouring system |
| CN113305283A (en) * | 2021-05-25 | 2021-08-27 | 西北工业大学 | High-flux preparation method of metal part |
| CN113926988A (en) * | 2021-09-09 | 2022-01-14 | 中国航发南方工业有限公司 | Bottom plate wax mold structure and forming method of directional solidification shell bottom plate |
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| CN104289674A (en) * | 2014-10-24 | 2015-01-21 | 东方电气集团东方汽轮机有限公司 | Precision casting method for column crystal guide vanes of gas turbine |
| CN104368764A (en) * | 2014-11-14 | 2015-02-25 | 西北工业大学 | Process bar of precision casting single-crystal turbine blade model |
| CN104368764B (en) * | 2014-11-14 | 2016-07-06 | 西北工业大学 | Hot investment casting single crystal turbine blade model process bar |
| CN104399894A (en) * | 2014-12-15 | 2015-03-11 | 东方电气集团东方汽轮机有限公司 | Wax tree structure applied to formation of high-temperature alloy single-crystal guide vane |
| CN104826995A (en) * | 2015-05-25 | 2015-08-12 | 东方电气集团东方汽轮机有限公司 | Vertical ceramic mold shell and molding method thereof |
| CN105081220B (en) * | 2015-09-25 | 2018-06-26 | 东方电气集团东方汽轮机有限公司 | Cavity ceramic shell mould and the ceramic shell mould forming method |
| CN105081220A (en) * | 2015-09-25 | 2015-11-25 | 东方电气集团东方汽轮机有限公司 | Multi-cavity ceramic die shell and forming method of ceramic die shell |
| CN105382197A (en) * | 2015-11-27 | 2016-03-09 | 株洲中航动力精密铸造有限公司 | Anti-deformation embedded block and forming method for mold case with flat bottom plate |
| CN105798230A (en) * | 2016-04-26 | 2016-07-27 | 东方电气集团东方汽轮机有限公司 | Wax mould module for casting gas turbine blades and assembling method thereof |
| CN106513634A (en) * | 2016-12-16 | 2017-03-22 | 上海华培动力科技有限公司 | Wax mold structure for high-temperature resisting alloy vacuum suction casting |
| CN107877807A (en) * | 2017-11-10 | 2018-04-06 | 中国航发动力股份有限公司 | A kind of directional solidification casting crystallization chassis manufacture method |
| CN108057851A (en) * | 2017-12-25 | 2018-05-22 | 霍山县忠福机电科技有限公司 | A kind of new casting method and device |
| CN110293216A (en) * | 2019-07-04 | 2019-10-01 | 深圳市万泽中南研究院有限公司 | It is a kind of for improve orientation or single crystal casting quality transition disc and consolidation furnace |
| CN110293216B (en) * | 2019-07-04 | 2021-05-25 | 深圳市万泽中南研究院有限公司 | Transition disc for improving quality of directional or single crystal casting and solidification furnace |
| CN112157223A (en) * | 2020-09-25 | 2021-01-01 | 深圳市万泽中南研究院有限公司 | Directional solidification casting method and pouring system |
| CN113305283A (en) * | 2021-05-25 | 2021-08-27 | 西北工业大学 | High-flux preparation method of metal part |
| CN113926988A (en) * | 2021-09-09 | 2022-01-14 | 中国航发南方工业有限公司 | Bottom plate wax mold structure and forming method of directional solidification shell bottom plate |
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