CN104475682B - A kind of heat resisting cast steel thin-walled turbine case investment pattern precision casting method based on combination type wax-pattern - Google Patents
A kind of heat resisting cast steel thin-walled turbine case investment pattern precision casting method based on combination type wax-pattern Download PDFInfo
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- CN104475682B CN104475682B CN201410788451.6A CN201410788451A CN104475682B CN 104475682 B CN104475682 B CN 104475682B CN 201410788451 A CN201410788451 A CN 201410788451A CN 104475682 B CN104475682 B CN 104475682B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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Abstract
The invention discloses a kind of heat resisting cast steel thin-walled turbine case investment pattern precision casting method based on combination type wax-pattern, belong to casting technology field.In described method, turbine case uses heat resisting cast steel material, low-temperature wax 3D is used to print turbine case wax-pattern, middle temperature wax melt extrudes molding cast rising head wax-pattern, bonding wax will both reliable bonding formation combination type wax-patterns, combination type wax-pattern investment pattern precision casting technical process includes: wax-pattern processed, combine wax-pattern, shell processed, fusible pattern dewaxing, roasting mold shell, alloy melting and cast, shake shell and the clear shell of ball blast etc..The present invention effectively raises turbine case shaping investment pattern efficiency, reduces cost；Ensure turbine case runner casting accuracy；Improve the mold-filling capacity of heat resisting cast steel, it is achieved the casting thin-wall of turbine case, wall thickness can be thinned to 3mm, it is achieved light-weighted purpose, meets aero-engine supercharger demand.
Description
Technical field
The present invention relates to aviation piston engine turbocharging technology field, be specifically related to the one of turbocharger based on combination type
The heat resisting cast steel thin-walled turbine case investment pattern precision casting technique of wax-pattern, is equally applicable to automobile turbocharger, and especially car turbine increases
Depressor technical field.
Background technology
Turbocharger is arranged on waste pipe, turbine case is directly connected with exhaustor, is in high temperature, high pressure
Under duty, especially on aviation piston engine and SI Engine electromotor, waste gas row's temperature up to 950 DEG C～1050 DEG C,
Row temperature higher than Diesel engine 850 DEG C is high, and conventional silicon-molybdenum ductile iron turbine case can not meet its performance requirement,
And austenitic heat resistant cast steel has good thermostability, fatigue durability, corrosion resistance, can fully adapt to turbine case hot operation ring
Border；Meanwhile, the use of austenitic heat resistant cast steel increases product comprehensive mechanical property, and then can reduce part wall thickness, reaches boat
The empty light-weighted requirement of supercharger, is advantageously implemented the purpose of automotive light weight technology；It addition, also can carry during electromotor uses
In the service life of high blower, reduce maintenance and the expense of assembling.Therefore austenitic heat resistant cast steel has become production high performance turbine
The preferred material of shell.
But due to austenitic heat resistant cast steel poor fluidity, pouring temperature is higher, the oxidation of easy air-breathing and scab, and turbine case knot
The factors such as structure Special complex so that austenitic heat resistant cast steel exists bigger technology difficulty in applying of turbine case, permanent mold casting,
The suitability of the Special Processes of Metal Castings method such as compression casting and sand casting is poor, and the turbine volute wall of casting is the thickest, the most about 5mm,
It is difficult to meet the requirement that aviation gasoline engine quality is light and thermal inertia is low；Meanwhile, thin wall complex structure part is difficult to cast molding,
It is easily generated defects such as owing casting, cold shut, misrun.
Summary of the invention
The technical problem to be solved is for aviation piston engine turbocharger, Truck Gasoline Engine by Turbocharging device
The casting technique of a kind of light-weighted heat resisting cast steel thin-walled turbine case is provided, uses the investment pattern precision casting forming method of combination type wax-pattern,
Reach thinning wall thickness, it is to avoid the purpose of casting flaw.
The heat resisting cast steel thin-walled turbine case investment pattern precision casting method based on combination type wax-pattern that the present invention provides, comprises the following steps:
A, manufacture turbine case wax-pattern.Selecting low-temperature wax CP200 as turbine case expendable pattern material, stand except water processes, 3D prints
Molding turbine case wax-pattern.
B, compacting cast rising head wax-pattern.Use softening point 76 DEG C, content of ashes≤0.03% (weight/mass percentage composition), fusing point 85 DEG C
A62 middle temperature mould material, stand except water process, melt extrude molding cast rising head wax-pattern.
C, combination wax-pattern.Use bonding wax by the turbine case wax-pattern in step a and the cast bonding combination of rising head wax-pattern in step b.
D, Ludox bonding agent shell.Technical process for coating, stucco and be dried.Powder and Ludox mix by a certain percentage
Make coating, including investment precoat, transition zone coating and backing layer coating.Surface layer uses investment precoat, and molten metal contacts,
Should not react with molten metal, it is ensured that shell inner surface quality, and use 70 mesh zircon sands as surface layer stucco；Two layers
Use transition zone coating, use 30～60 mesh gangue stuccos；Backing layer coating ensures the high and low temperature intensity of shell, it is ensured that
Foundry goods is indeformable and dimensional accuracy, and stucco is 16～24 mesh gangues；Finally complete slurry seal.
E, fusible pattern dewax.
F, roasting mold shell.
G, alloy melting and cast.Intermediate frequency vacuum induction melting austenitic heat resistant cast steel, and use vacuum casting process.
H, shake shell and the clear shell of ball blast.
In described step d, the powder of investment precoat and transition zone coating is 325 mesh zirconium English powder, containing as follows in described zirconium English powder
The component of weight/mass percentage composition: ZrO2Content >=65%, Fe2O3Content≤0.1%, TiO2Content≤0.5%, P2O5Content≤
0.1%, Al2O3Content≤0.3%, SiO2Content < 33%；Density is 4.6～4.78g/cm3；Refractoriness > 1500 DEG C；Hardness 7.5
Mohs' hardness；The coefficient of expansion: 4.6 × 10-3(l/℃)。
In described step d, powder and the Ludox mixed proportion of investment precoat are 3.7:1.
In described step d, powder and the Ludox mixed proportion of transition zone coating are 2.0:1.
In described step d, the powder of backing layer coating is the colliery powder of 270～320 mesh, and refractoriness is more than 1450 DEG C.
In described step d, powder and the Ludox mixed proportion of backing layer coating are 1.4:1.
In described step d, Ludox component content is mainly SiO2: 30～31% (weight/mass percentage composition), Na2O≤0.3% (matter
Amount percentage composition)；Density (25 DEG C): 1.195～1.215g/cm3；Viscosity (20 DEG C)≤7.0Pa.S × 10-1；PH value 8.5～10.0；
Mean diameter 10～20nm；Outward appearance: milky is translucent；Stable phase: 1 year.
In described step f, sintering temperature is 1100 DEG C, and temperature retention time is not less than 1h.
In described step g, smelting temperature 1590 ± 10 DEG C.
In described step g, cast vacuum is less than 100Pa, pouring temperature 1510 ± 10 DEG C.
It is an advantage of the current invention that:
(1) 3D prints the application of advanced manufacturing technology, it is not necessary to design turbine case casted die mould, effectively raises turbine case wax
Mold forming efficiency, reduces manufacturing cost.
(2) combination type wax-pattern, uses low-temperature wax 3D to print turbine case wax-pattern, it is ensured that turbine case runner casting accuracy；Middle temperature wax
Melt extrude molding cast rising head wax-pattern, reduce manufacturing cost；Reliably combine bonding by bonding wax, there is good manufacturability.
(3) vacuum casting process process overcomes the problem of heat resisting cast steel poor fluidity, improves the mold-filling capacity of heat resisting cast steel,
Realizing the casting thin-wall of turbine case, wall thickness can be thinned to 3mm, it is achieved light-weighted purpose, meets aero-engine supercharger need
Ask.Reduce the defect such as pore, slag inclusion simultaneously, the product yield of product can be significantly improved.
(4) investment pattern precision casting casting dimension accuracy is high, and locally moulding is complicated, die cavity is narrow and small and is difficult to the problem cast to solve turbine case,
The austenitic heat resistant cast steel turbine case produced has good mechanical property, thermal fatigue property and antioxygenic property, meets 1050 DEG C
Hot environment reliable operation sexual demand.
Accompanying drawing explanation
Fig. 1 is the process method flow chart of the present invention.
Fig. 2 is embodiment 1 turbine case wax-pattern and cast rising head wax-pattern combination schematic diagram.
Fig. 3 is embodiment 2 turbine case contour structures schematic diagram.
In figure:
1-integral turbine shell wax-pattern；2-pours into a mould rising head wax-pattern；3-turbine case wax-pattern and cast rising head wax-pattern bonding plane；On 4-turbine case
Half-shell；5-turbine case lower half shell；6-seam.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Embodiment 1:
Of the present invention for heat resisting cast steel thin-walled turbine case solid investment casting structure as in figure 2 it is shown, its process combine
Fig. 1, comprises the following steps:
A, selection low-temperature wax CP200, as turbine case expendable pattern material, stand except water processes, and use 3D printing technique molding entirety
Turbine case wax-pattern 1.
B, employing softening point 76 DEG C, ash weight/mass percentage composition≤0.03%, the A62 middle temperature mould material that fusing point is 85 DEG C, standing is removed
Water processes, and melt extrudes molding cast rising head wax-pattern 2.
C, combination wax-pattern: use bonding wax by the integral turbine shell wax-pattern 1 in step a and the cast rising head wax-pattern 2 in step b
Bonding combination at bonding plane 3, bonding wax temperature controls in the range of 160 ± 10 DEG C.
D, Ludox bonding agent shell.Technical process for coating, stucco and be dried, investment precoat is 325 mesh zirconium English powder, adopts
With 70 mesh zircon sands as surface layer stucco；Two layers still use investment precoat 325 mesh zirconium English powder, 30～60 mesh gangue stuccos；
The colliery powder of backing layer coating 270～320 mesh, 16～24 mesh gangue stuccos；Finally complete slurry seal.
E, electric heating dewaxing kettle carry out fusible pattern dewaxing.
F, roasting mold shell at 1100 DEG C, the time is not less than 1h, burning-off remnants wax material, moisture and volatile matter thereof.
G, 1590 ± 10 DEG C of melting austenitic heat resistant cast steels of intermediate frequency vaccum sensitive stove, use the gravity-assist pouring under vacuum, vacuum
Less than 100Pa, pouring temperature 1510 ± 10 DEG C.
H, shake shell and the clear shell of ball blast.
Embodiment 2:
Turbine case profile for casting of the present invention is as it is shown on figure 3, its heat resisting cast steel thin-walled full form casting process method bag
Include following steps:
A, selection low-temperature wax CP200, as turbine case expendable pattern material, stand except water processes, use 3D printing technique molding turbine
Shell upper half shell 4 wax-pattern.
B, employing softening point 76 DEG C, ash weight/mass percentage composition≤0.03%, the A62 middle temperature mould material that fusing point is 85 DEG C, standing is removed
Water processes, and melt extrudes molding cast rising head wax-pattern 2.
C, use bonding wax by turbine case upper half shell 4 wax-pattern in step a and the cast bonding combination of rising head wax-pattern in step b,
Bonding wax temperature controls in the range of 160 ± 10 DEG C.
D, selection low-temperature wax CP200, as turbine case expendable pattern material, stand except water processes, use 3D printing technique molding turbine
Shell lower half shell 5 wax-pattern.
E, employing softening point 76 DEG C, ash weight/mass percentage composition≤0.03%, 162 middle temperature mould material of fusing point 85 DEG C, standing is removed
Water processes, and melt extrudes molding cast rising head wax-pattern 2.
F, use bonding wax by turbine case lower half shell 5 wax-pattern in step d and the bonding combination of cast rising head wax-pattern 2 in step e,
Bonding wax temperature controls in the range of 160 ± 10 DEG C.
G, Ludox bonding agent carry out turbine case upper half shell 4 and turbine case lower half shell 5 shell processed respectively.Technical process for coating,
Stucco is with dry, and investment precoat is 325 mesh zirconium English powder, uses 70 mesh zircon sands as surface layer stucco；Two layers still use face
Coating 325 mesh zirconium English powder, 30～60 mesh gangue stuccos；The colliery powder of backing layer coating 270～320 mesh, 16～24 mesh
Gangue stucco；Finally complete slurry seal.
H, the formwork of turbine case upper half shell 4 and turbine case lower half shell 5 use electric heating dewaxing kettle carry out fusible pattern dewaxing.
I, roasting turbine case upper half shell 4 and the formwork of turbine case lower half shell 5 at 1100 DEG C, the time is not less than 1h, and burning-off is remaining
Wax material, moisture and volatile matter thereof.
J, 1590 ± 10 DEG C of melting austenitic heat resistant cast steels of intermediate frequency vaccum sensitive stove, use the gravity-assist pouring method under vacuum respectively
Cast turbine case upper half shell 4 and turbine case lower half shell 5, vacuum is less than 100Pa, pouring temperature 1510 ± 10 DEG C.
K, shake shell and the clear shell of ball blast to the turbine case upper half shell 4 being poured and turbine case lower half shell 5.
Turbine case upper half shell 4 and turbine case lower half shell 5 are welded at seam 6 and are combined into turbine box by l, employing argon arc welding, it is desirable to
Firm, and butt welded seam carries out leak check.
Claims (8)
1. a heat resisting cast steel thin-walled turbine case investment pattern precision casting method based on combination type wax-pattern, it is characterised in that: described method include with
Lower step:
A, manufacture turbine case wax-pattern: select low-temperature wax CP200 as turbine case expendable pattern material, stand except water processes, molding wax-pattern；
B, compacting cast rising head wax-pattern: use softening point 76 DEG C, ash weight/mass percentage composition≤0.03%, the A62 that fusing point is 85 DEG C
Middle temperature mould material, stands except water processes, and melt extrudes molding cast rising head wax-pattern；
C, combination wax-pattern: use bonding wax by the turbine case wax-pattern in step a and the cast bonding combination of rising head wax-pattern in step b；
D, Ludox bonding agent shell: technical process for coating, stucco and be dried；Powder and Ludox are mixed in proportion to be made
Coating, including investment precoat, transition zone coating and backing layer coating；Surface layer uses investment precoat, and molten metal contacts, no
Should react with molten metal, and use 70 mesh zircon sands as surface layer stucco；Two layers use transition zone coating, use
30～60 mesh gangue stuccos；Backing layer coating ensures the high and low temperature intensity of shell, and stucco is 16～24 mesh gangues；?
After complete slurry seal；
E, fusible pattern dewax；
F, roasting mold shell；
G, alloy melting and cast: intermediate frequency vacuum induction melting austenitic heat resistant cast steel, and use vacuum casting process；
H, shake shell and the clear shell of ball blast.
A kind of heat resisting cast steel thin-walled turbine case investment pattern precision casting method based on combination type wax-pattern, its feature exists
In: turbine case wax-pattern uses 3D to print advanced forming technique.
A kind of heat resisting cast steel thin-walled turbine case investment pattern precision casting method based on combination type wax-pattern, its feature exists
In: in described step d, the powder of investment precoat and transition zone coating is 325 mesh zirconium English powder, containing following matter in described zirconium English powder
The component of amount percentage composition: ZrO2Content >=65%, Fe2O3Content≤0.1%, TiO2Content≤0.5%, P2O5Content≤0.1%,
Al2O3Content≤0.3%, SiO2Content < 33%；Density is 4.6～4.78g/cm3；Refractoriness > 1500 DEG C；Hardness 7.5 Mohs
Hardness；The coefficient of expansion: 46 × 10-3(l/℃)；The powder of investment precoat and Ludox mixed proportion are 3.7:1；Transition zone coating
Powder and Ludox mixed proportion are 2.0:1.
A kind of heat resisting cast steel thin-walled turbine case investment pattern precision casting method based on combination type wax-pattern, its feature exists
In: in described step d, the powder of backing layer coating is the colliery powder of 270～320 mesh, and refractoriness is more than 1450 DEG C；Backing layer coating
Powder and Ludox mixed proportion be 1.4:1.
A kind of heat resisting cast steel thin-walled turbine case investment pattern precision casting method based on combination type wax-pattern, its feature exists
In: in described step d, the weight/mass percentage composition of Ludox composition includes SiO2: 30～31%, Na2O≤0.3%；Room temperature density
1.195～1.215g/cm3；Viscosity≤7.0Pa.S × 10-1；PH value 8.5～10.0；Mean diameter 10～20nm；Outward appearance: milky
Translucent；Stable phase: 1 year.
A kind of heat resisting cast steel thin-walled turbine case investment pattern precision casting method based on combination type wax-pattern, its feature exists
In: in described step f, sintering temperature is 1100 DEG C, and temperature retention time is not less than 1h.
A kind of heat resisting cast steel thin-walled turbine case investment pattern precision casting method based on combination type wax-pattern, its feature exists
In: in described step g, smelting temperature 1590 ± 10 DEG C.
A kind of heat resisting cast steel thin-walled turbine case investment pattern precision casting method based on combination type wax-pattern, its feature exists
In: in described step g, cast vacuum is less than 100Pa, pouring temperature 1510 ± 10 DEG C.
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