CN104399887A - Precision casting method of back cover of spiral supercharging diffuser - Google Patents

Precision casting method of back cover of spiral supercharging diffuser Download PDF

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Publication number
CN104399887A
CN104399887A CN201410621707.4A CN201410621707A CN104399887A CN 104399887 A CN104399887 A CN 104399887A CN 201410621707 A CN201410621707 A CN 201410621707A CN 104399887 A CN104399887 A CN 104399887A
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China
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wax
casting
diffuser
cold
rising head
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CN201410621707.4A
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CN104399887B (en
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范修谦
郝红枫
袁建强
李雪兴
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Baoding Sail Precision Machinery Technology Co., Ltd.
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BAODING FENGFAN PRECISION CASTING Co Ltd
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Abstract

The invention discloses a precision casting method of the back cover of a spiral supercharging diffuser. The casting method comprises steps of wax member preparation, assembling, slurry dipping and shell manufacturing, de-waxing, burning, casting, shell breaking, and cleaning. In the wax member preparation step, a cold wax core is manufactured through a cold wax core mould, then the cold wax core is allowed to stand still, and after the standing time is longer than four hours, the cold wax core is placed into a diffuser back cover mould to assemble a wax member. In the assembling step, the assembled wax member is trimmed and then adhered, and a casting system with a cast gate, a runner, and a sink head is combined with the wax member. In the slurry dipping and shell manufacturing step, after the wax member and the casting system are combined to form an assembled member, slurry is painted on the periphery of the assembled member. The tendencies of shrinkage hole and shrinkage porosity in the casting are reduced by the provided method, and the qualified rate of the casting is improved therefor.

Description

A kind of casting method of spiral boosting diffuser bonnet
Technical field
The present invention relates to a kind of casting method of parts of diffuser, especially a kind of casting method being applicable to diffuser bonnet, belongs to precision casting process technical field.
Background technology
The material of U-shaped super-pressure spiral boosting diffuser is generally austenite cast stainless steel, is that U-shaped multiple coil supercharging diffusion tipping joins a key component in Welding Structure, the large plane of rear cover casting and diffuser body erection welding.Require after Product jointing that operating pressure is greater than 3000Psi, because the wall thickness of rear cover casting is greater than 50mm, manufacture in hot investment casting in the process of wax part, easily deform owing to shrinking wax part, cause casting dimension overproof, cause the casting dimension accuracy of form and position defective, meanwhile, due to casting section thickness, easily there is shrinkage porosite in the centre of foundry goods, produce shrinkage cavity at cast gate place, affect the welding procedure of foundry goods, the technical requirement making product not reach operating pressure to be greater than 3000Psi.
Summary of the invention
The object of the present invention is to provide a kind of casting method of spiral boosting diffuser bonnet, reduce the size shape position error of foundry goods, reduce processing capacity, improve the castability in erection welding face, preventing cast-internal from occurring there is shrinkage cavity in shrinkage porosite and casting head of casting position, improves the qualification rate of product.
Problem of the present invention realizes with following technical proposals:
A casting method for spiral boosting diffuser bonnet, it comprises making wax part, group number successively, is stained with slurry shell processed, dewaxing, roasting, cast, broken shell and cleanup step;
In described making wax part step, first manufacture cold wax core by cold wax core model, afterwards cold wax core is left standstill, after being greater than four hours when left, cold wax core being put in the mould of diffuser bonnet and being assembled into wax part;
In described group of number step, bond after the wax part assembled is repaired, afterwards the running gate system and wax part that comprise cast gate, running channel and rising head are combined;
Described being stained with is starched in shell step processed, after wax part and running gate system are combined into assembly, at the periphery of assembly coating slurry;
In described calcination steps, sintering temperature is 1100-1150 DEG C, and roasting time is 45-50min;
In described cast step, pouring temperature is 1550-1560 DEG C.
The casting method of above-mentioned spiral boosting diffuser bonnet, described wax part profile corresponding with diffuser rear cover casting profile, wax part comprises two cold wax cores and two cold wax cores is wrapped up the shell be integrated, the cross section of described cold wax core is semi-circular shape, one end of cold wax core is small end face, the other end of cold wax core is large end face, the external diameter of semicircular ring is increased to large end face by small end face, at the curved wall of cold wax core, small end face and large end face are all vertically installed with multiple conical wax thorn, on the curved wall of the cold wax core near large end face, circumferentially uniform radial direction runs through and arranges three circular holes, arbitrary craspedodrome sidewall of cold wax core vertically arranges the positioning table of a rectangular structure.
The casting method of above-mentioned spiral boosting diffuser bonnet, described running gate system comprises cast gate, running channel and rising head, described rising head is vertically set on the small end face of wax part, and described running channel is erected at the top of rising head, and described cast gate is vertically set on the middle part of the end face of running channel.
The further improvement of the casting method of above-mentioned spiral boosting diffuser bonnet is, described rising head arranges two, is arranged symmetrically on the small end face of wax part.
The casting method of a kind of spiral boosting diffuser bonnet according to claim 4, the shape of cross section of described rising head is annular, and the ratio between the external diameter of rising head top annulus and the centre bore of diffuser rear cover casting is 4:5; Ratio between the height K of rising head and diffuser rear cover casting gross thickness H is 3:5.
The casting method of above-mentioned spiral boosting diffuser bonnet, at the top of rising head erection running channel, the cross section of running channel is rectangle, and the width of running channel is corresponding with the external diameter of rising head top annulus; The height of running channel is the gross thickness H sum of riser height K and diffuser rear cover casting.
The further improvement of the casting method of above-mentioned spiral boosting diffuser bonnet is, described in be stained with slurry shell step processed in, apply six layers of slurry successively in assembly periphery.
The further improvement of the casting method of above-mentioned spiral boosting diffuser bonnet is, described six layers of slurry comprise connect layer by layer five layers of backing layer in surface layer that inner side and assembly outer wall contact and outside, the slurry of described surface layer is the mixture of zircon sand, zirconium powder, and the slurry of described backing layer is Mo Laisha, does not carry out the mixture of powder.
Beneficial effect of the present invention is:
The invention solves the size accuracy of form and position offset issue of diffuser rear cover casting, decrease processing capacity, reduce cost, improve the castability in erection welding face simultaneously, prevent foundry goods centre from occurring shrinkage defect, prevent casting head of casting position from occurring shrinkage cavity, reduce the trend producing shrinkage cavity and porosity etc. and occur, improve the qualification rate of foundry goods.
Wax part is assembled by two cold wax cores and shell, reduces wax part generation depressed deformation, meets size and the processing request of foundry goods, improve the precision of foundry goods.
The design of running gate system decreases super large thick-walled parts casting flaw, improves the welding usability of diffuser bonnet and the performance of bearing high pressure of postwelding.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is the structural representation of cold wax core of the present invention;
Fig. 2 is the side view of Fig. 1;
Fig. 3 is the K direction view of Fig. 1;
Fig. 4 is the structural representation of wax part of the present invention;
Fig. 5 is the A-A sectional view of Fig. 4;
Fig. 6 is after group number step completes, the combining structure schematic diagram of wax part and running gate system;
Fig. 7 is the isometric views of Fig. 6.
In figure, each list of reference numerals is: 1, wax part, 11, wax thorn, 12, circular hole, 13, positioning table, 2, rising head, 3, running channel, 4, cast gate.
Detailed description of the invention
A casting method for spiral boosting diffuser bonnet, it comprises making wax part, group number successively, is stained with slurry shell processed, dewaxing, roasting, cast, broken shell and cleanup step.
In described making wax part step, first cold wax core is manufactured by cold wax core model, the structure of described cold wax core is referring to Fig. 1-Fig. 3, the cross section of cold wax core is semi-circular shape, one end of cold wax core is small end face, the other end of cold wax core is large end face, the external diameter of semicircular ring is increased to large end face by small end face, at the curved wall of cold wax core, small end face and large end face are all vertically installed with multiple conical wax thorn 11, on the curved wall of the cold wax core near large end face, circumferentially uniform radial direction runs through and arranges three circular holes 12, arbitrary craspedodrome sidewall of cold wax core vertically arranges the positioning table 13 of a rectangular structure.
Afterwards cold wax core is left standstill, after being greater than four hours when left, cold wax core being put in the mould of diffuser bonnet and being assembled into wax part 1.The structure of described wax part 1 is referring to Fig. 4 and Fig. 5, and wax part 1 profile corresponding with diffuser rear cover casting profile, wax part 1 comprises cold wax core and shell.Described cold wax core has two, and two cold wax cores cooperatively interact, and is supported on another craspedodrome sidewall of the other side respectively by respective positioning table 13, makes cross section form a complete annulus.Described shell is coated on the periphery of two cold wax cores, and be integrated by two cold wax core parcels, the described wax thorn conical top of 11 overlaps with the outer surface of shell.Only at the new wax of one deck that the outer layer covers of wax part is very thin when ensureing that final wax part is shaped, decrease the contraction of wax part, the wax part avoiding the contraction of wax part to produce is uneven, prevents the last position of wax part from caving in, controls the dimensional accuracy of wax part.
In described group of number step, after first being repaired by the wax part assembled, bonding firmly; Wax part 1 and running gate system are combined afterwards, the structure of the assembly combined as shown in Figure 6 and Figure 7.Described running gate system comprises cast gate 4, running channel 3 and rising head 2, and described rising head 2 is vertically set on the small end face of wax part 1, and described rising head 2 arranges two, is arranged symmetrically on the small end face of wax part 1.The shape of cross section of rising head 2 is one section of annular, and the ratio between the external diameter of rising head top annulus and the centre bore of diffuser rear cover casting is 4:5; Ratio between the height K of rising head 2 and diffuser rear cover casting gross thickness H is 3:5.Described running channel 3 is erected at the top of rising head 2, and the cross section of running channel 3 is rectangle, and the width of running channel is corresponding with the external diameter of rising head top annulus; The height of running channel is the gross thickness H sum of riser height K and diffuser rear cover casting.Described cast gate 4 is vertically set on the middle part of the end face of running channel 3, carries out pouring operation for convenience, and described cast gate is the tablet with cup.
After group number step completes, carry out degreasing to the assembly that wax part and running gate system are combined into, in described skimming processes, ZF301 degreasing agent selected by degreasing agent, and degreasing time is 12-18s.
Described being stained with is starched in shell step processed, after degreasing completes, at assembly periphery coating slurry, is ensure casting quality, applies six layers of slurry in the periphery of assembly successively.Described six layers of slurry comprise one deck surface layer and five layers of backing layer, described surface layer be positioned at inner side, contact with assembly outer wall, described backing layer is positioned at the outside of surface layer, five layers of backing layer connect layer by layer.The slurry of described surface layer is the mixture of zircon sand, zirconium powder, and wherein the viscosity of mixture is 48-52s; The granularity of mixture is 80-120 order.The slurry of described backing layer is Mo Laisha, does not carry out the mixture of powder, and wherein the viscosity of mixture is 14-16s; The granularity of mixture is 30-60 order.
After being stained with slurry shell processed completing, first put into steam dewaxing stove dewax being stained with the assembly after slurry, the pressure that dewaxes in stove is adjusted to 0.6-0.8MPa.Roasting is carried out after having dewaxed.In described calcination steps, sintering temperature is 1100-1150 DEG C, and roasting time is 45-50min.
After roasting, pour into a mould melted molten steel.In described cast step, pouring molten steel temperature is 1550-1560 DEG C.
After foundry goods cooling forming, carry out broken shell and the cleanup step of postorder.After broken shell, adopt chain sling to carry out a Shot Blasting, the ball blast time is 15-30min, and the shot granularity selected is 0.4mm.Cut afterwards, grind cast gate, cast gate residual quantity is for being not more than 0.5mm.Carry out secondary Shot Blasting afterwards, the ball blast time is 20-40min, and the shot granularity selected is 0.4mm.
After secondary ball blast completes, to test finishing to foundry goods, after the foundry goods repaired is heat-treated on request, carry out third time Shot Blasting, the ball blast time is 30-40min, and the shot granularity selected is 0.4mm.Check further foundry goods afterwards, warehousing after passing is preserved or is carried out postorder mechanical processing steps.

Claims (8)

1. a casting method for spiral boosting diffuser bonnet, is characterized in that, it comprises making wax part, group number successively, is stained with slurry shell processed, dewaxing, roasting, cast, broken shell and cleanup step;
In described making wax part step, first manufacture cold wax core by cold wax core model, afterwards cold wax core is left standstill, after being greater than four hours when left, cold wax core being put in the mould of diffuser bonnet and being assembled into wax part (1);
In described group of number step, bond after the wax part assembled is repaired, afterwards the running gate system and wax part (1) that comprise cast gate (4), running channel (3) and rising head (2) are combined;
Described being stained with is starched in shell step processed, after wax part and running gate system are combined into assembly, at the periphery of assembly coating slurry;
In described calcination steps, sintering temperature is 1100-1150 DEG C, and roasting time is 45-50min;
In described cast step, pouring temperature is 1550-1560 DEG C.
2. the casting method of a kind of spiral boosting diffuser bonnet according to claim 1, it is characterized in that, described wax part (1) profile corresponding with diffuser rear cover casting profile, wax part (1) comprises two cold wax cores and two cold wax cores is wrapped up the shell be integrated, the cross section of described cold wax core is semi-circular shape, one end of cold wax core is small end face, the other end of cold wax core is large end face, the external diameter of semicircular ring is increased to large end face by small end face, at the curved wall of cold wax core, small end face and large end face are all vertically installed with multiple conical wax thorn (11), on the curved wall of the cold wax core near large end face, circumferentially uniform radial direction runs through and arranges three circular holes (12), arbitrary craspedodrome sidewall of cold wax core vertically arranges the positioning table (13) of a rectangular structure.
3. the casting method of a kind of spiral boosting diffuser bonnet according to any one of claim 1 or 2, it is characterized in that, described running gate system comprises cast gate (4), running channel (3) and rising head (2), described rising head (2) is vertically set on the small end face of wax part (1), described running channel (3) is erected at the top of rising head (2), and described cast gate (4) is vertically set on the middle part of the end face of running channel (3).
4. the casting method of a kind of spiral boosting diffuser bonnet according to claim 3, it is characterized in that, described rising head (2) arranges two, is arranged symmetrically on the small end face of wax part (1).
5. the casting method of a kind of spiral boosting diffuser bonnet according to claim 4, it is characterized in that, the shape of cross section of described rising head (2) is annular, and the ratio between the external diameter of rising head top annulus and the centre bore of diffuser rear cover casting is 4:5; Ratio between the height K of rising head and diffuser rear cover casting gross thickness H is 3:5.
6. the casting method of a kind of spiral boosting diffuser bonnet according to claim 5, it is characterized in that, on the top of rising head (2) erection running channel (3), the cross section of running channel (3) is rectangle, and the width of running channel is corresponding with the external diameter of rising head top annulus; The height of running channel is the gross thickness H sum of riser height K and diffuser rear cover casting.
7. the casting method of a kind of spiral boosting diffuser bonnet according to claim 1, is characterized in that, described in be stained with slurry shell step processed in, apply six layers of slurry successively in assembly periphery.
8. the casting method of a kind of spiral boosting diffuser bonnet according to claim 7, it is characterized in that, described six layers of slurry comprise connect layer by layer five layers of backing layer in surface layer that inner side and assembly outer wall contact and outside, the slurry of described surface layer is the mixture of zircon sand, zirconium powder, and the slurry of described backing layer is Mo Laisha, does not carry out the mixture of powder.
CN201410621707.4A 2014-11-07 2014-11-07 Precision casting method of back cover of spiral supercharging diffuser Active CN104399887B (en)

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CN104999037A (en) * 2015-08-21 2015-10-28 东方电气集团东方汽轮机有限公司 Concreting system for thin-walled cylindrical part and precision casting formation method
CN104999034A (en) * 2015-07-16 2015-10-28 西安航空动力股份有限公司 Casting method of large allowance-free pressure expander precise casting piece
CN108672658A (en) * 2018-05-25 2018-10-19 保定风帆精密铸造制品有限公司 A kind of thrust power water inlet end pieces precision casting process method peculiar to vessel
CN108907083A (en) * 2018-09-13 2018-11-30 襄阳市立强机械有限公司 Lead-acid accumulator is crushed special chain carrier bar investment casting method

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104999034A (en) * 2015-07-16 2015-10-28 西安航空动力股份有限公司 Casting method of large allowance-free pressure expander precise casting piece
CN104999034B (en) * 2015-07-16 2017-04-19 西安航空动力股份有限公司 Casting method of large allowance-free pressure expander precise casting piece
CN104999037A (en) * 2015-08-21 2015-10-28 东方电气集团东方汽轮机有限公司 Concreting system for thin-walled cylindrical part and precision casting formation method
CN104999037B (en) * 2015-08-21 2017-12-19 东方电气集团东方汽轮机有限公司 A kind of running gate system and its precision casting molding method for thin-walled tubular piece
CN108672658A (en) * 2018-05-25 2018-10-19 保定风帆精密铸造制品有限公司 A kind of thrust power water inlet end pieces precision casting process method peculiar to vessel
CN108907083A (en) * 2018-09-13 2018-11-30 襄阳市立强机械有限公司 Lead-acid accumulator is crushed special chain carrier bar investment casting method
CN108907083B (en) * 2018-09-13 2020-02-14 襄阳市立强机械有限公司 Investment casting method for chain plate special for crushing waste lead-acid storage battery

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