CN110042326A - A kind of centrifugal casting agitator arm and method - Google Patents
A kind of centrifugal casting agitator arm and method Download PDFInfo
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- CN110042326A CN110042326A CN201910424109.0A CN201910424109A CN110042326A CN 110042326 A CN110042326 A CN 110042326A CN 201910424109 A CN201910424109 A CN 201910424109A CN 110042326 A CN110042326 A CN 110042326A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
- B22D13/101—Moulds
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
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- Mechanical Engineering (AREA)
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Abstract
The invention discloses a kind of centrifugal casting agitator arm and methods, belong to impeller production technical field.The chemical component of the wheel piece of impeller contains C:2.3~3.0%, Si according to quality :≤1.0%, Mn:0.5~1.0%, Cr:17~23%, Mo:0.3~0.8%, P :≤0.035%, S :≤0.06%, Ni:0~1.5%, Co:0~1.0%, Cu:0~2.0%, remainder are Fe and inevitable impurity；The chemical component of the wheel hub contains C:0.3~0.4%, Si:0.6~0.9%, Mn:0.9~1.2%, Cr:1.8~2.2%, Mo:0.3~0.8%, P according to quality :≤0.035%, S :≤0.035%, Ni:1.6~2.0%, Co:0.3~0.8%, and remainder is Fe and inevitable impurity.
Description
Technical field
The invention belongs to impeller production technical fields, more specifically to a kind of centrifugal casting agitator arm and method.
Background technique
Agitator arm composition: being mainly made of wheel hub and wheel piece, is that the high-speed stirred of powder stirring machinery mixes component.Its
Working principle: it is using the method for welding or monoblock cast that wheel hub and wheel piece combination is integral, it is assemblied in the high speed of Mixing Machine
In rotation axis, rotates with the axis to stir extruding mixing powder (such as cement, clinker material, lime, refractory material), be mainly used for
Brickmaking mechanical and machinery of paving the way etc..The diameter of agitator arm in 500~800mm, the quality of wheel hub account for impeller gross mass 80~
81%, the quality for taking turns piece accounts for the 19~20% of impeller gross mass.
The manufacturing method of China's agitator arm includes following methods at present: 1) using point integral expression method, i.e., passed through by steel plate
Oxyacetylene metal-cutting and become annulus (along annular radii direction cutting disconnect semiclosed annulus), annulus is placed in furnace burn it is red after be placed on pressure
It is suppressed into a blade in particular manufacturing craft on power machine, several blades are covered and are welded on a cylindrical body.Such as: patent
Number: JP54006854, date of declaration 1979-01-19；The patent No.: US6443040, date of declaration 2002-19-03, two patents its
Essence is substantially the same, is entwined on a cylinder with strip (or steel plate).
2) casting method with the vanishing pattern is that paraffin similar with agitator arm shape or bubbles model bonding are combined into model
Cluster is embedded in vibration molding in drystone sand, is poured under negative pressure, model is made to gasify after brushing fireproof coating and drying, molten metal
Body occupies modal position, and the novel casting method of agitator arm is formed after solidification is cooling.Such as: Chinese Patent Application No.
201810922353.5, the patent document in publication date on December 7th, 2018 discloses a kind of high abrasion Integral-type screw conveyer
The manufacturing method of blade, (1) processing are used for the molding die of each section of helical blade；(2) foam mold of each section of helical blade is prepared
Sample；(3) Foam Pattern of integral screw blade is prepared；(4) the integral foam apperance containing running gate system and riser is prepared；(5) right
It is poured integral foam apperance surface and carries out refractory coating processing；(6) melt iron；(7) lost foam casting mould casting；(8) it casts
Part isothermal holding, obtains based on lower bainite and the spheroidal graphite cast-iron containing austenite；(9) finishing of castings is handled.
3) extrinsion pressing, such as: Chinese Patent Application No. 201220378248.8, publication date on January 30th, 2013
Patent document discloses a kind of helical blade forming frock, including upper mold and lower die, the lower end surface of upper mold and the upper surface of lower die
On be both provided with curved surface identical with helical blade curvature, and the contact surface of upper mold and lower die mutually coincide.Pass through molding die
Direct blanking is through multiple press process formed blades.
4) centre spinning, such as: Chinese Patent Application No. 201310490727.8, publication date on January 22nd, 2014
Patent document, discloses a kind of casting method of blade, and step includes mold design, mold manufacture, raw material melting, blanking standard
Standby, centrifugal casting, cooling for the first time, second of molding, second of cooling, trimming and sandblasting, hot isostatic pressing etc.,
For another example, Chinese Patent Application No. 201210074370.0, the patent document in publication date on July 18th, 2012 are open
A kind of centrifugal casting method of aluminum alloy impeller, Step 1: prepare impeller wax-pattern；Step 2: wax-pattern preheats；Step 3: work
Tool processing；Step 4: carrying out melting: step 4 one, melting Al7Si aluminium ingot to the alloy that impeller is selected；Step 4 two is added
Al-5Ti intermediate alloy melting；Pure Mg block melting is added in step 4 three；The melting of Al-10Sr intermediate alloy is added in step 4 four:
Al-10Sr intermediate alloy is added in graphite crucible, finally by graphite crucible melt stirring 1~remove after five minutes
Gas refining；Step 5: centrifugal casting, above-mentioned alloy molten solution is made to fill type, solidification under the influence of centrifugal force, setting time is 3~
It 15 minutes, finally demoulds, clear up casting.
For these existing manufacturing methods, it can be used to manufacture agitator arm, but manufacture obtained agitator arm
Material it is consistent, meet take turns piece wearability under the premise of, the intensity of wheel hub is poor；Under the premise of meeting wheel hub intensity, wheel
The wear-resisting property of piece is poor, and the service life of two kinds of structures is unable to satisfy the requirement used, and therefore, urgent need will develop a kind of system
Make the agitator arm that wearability is good, intensity is high.
Summary of the invention
1. to solve the problems, such as
It is poor for existing agitator arm wear-resisting property, intensity is not high, causes the problem that service life is short, the present invention provides one
Kind centrifugal casting agitator arm, by using the mode of centrifugal casting, so that wheel piece has very high wear-resisting property, wheel hub has
Very high intensity extends the service life of agitator arm.
It is a further object of the present invention to provide a kind of methods of centrifugal casting agitator arm, so that the combination of wheel piece and wheel hub
Intensity is good, under the premise of guaranteeing wearability and intensity, extends the service life of agitator arm.
2. technical solution
To solve the above-mentioned problems, the technical solution adopted in the present invention is as follows:
A kind of centrifugal casting agitator arm of the invention, including wheel hub and wheel piece, the wheel piece helical ring are located on wheel hub,
Wherein the chemical component of the wheel piece contains C:2.3~3.0%, Si according to quality :≤1.0%, Mn:0.5~1.0%, Cr:17
~23%, Mo:0.3~0.8%, P :≤0.035%, S :≤0.06%, Ni:0~1.5%, Co:0~1.0%, Cu:0~
2.0%, remainder is Fe and inevitable impurity；The chemical component of the wheel hub contains C:0.3~0.4%, Si according to quality:
0.6~0.9%, Mn:0.9~1.2%, Cr:1.8~2.2%, Mo:0.3~0.8%, P :≤0.035%, S :≤0.035%,
Ni:1.6~2.0%, Co:0.3~0.8%, remainder are Fe and inevitable impurity.
In a kind of possible embodiment of the present invention, the joining place of the wheel hub and wheel piece is formed with a transition zone,
The thickness h of transition zone is 0.1mm~0.2mm.
In a kind of possible embodiment of the present invention, the chemical component of the wheel piece according to quality contain C:2.3~
3.0%, Si :≤1.0%, Mn:0.5~1.0%, Cr:17~22%, Mo:0.3~0.8%, P :≤0.035%, S :≤
0.06%, Ni:0~1.5%, Co:0~1.0%, Cu:0~2.0%, remainder are Fe and inevitable impurity.
In a kind of possible embodiment of the present invention, the chemical component of the wheel piece according to quality contain C:2.3~
3.0%, Si :≤1.0%, Mn:0.5~1.0%, Cr:22~23%, Mo:0.3~0.8%, P :≤0.035%, S :≤
0.06%, Ni:0~1.5%, Co:0~1.0%, Cu:0~2.0%, remainder are Fe and inevitable impurity.
In a kind of possible embodiment of the present invention, the chemical component of the wheel piece also contain according to quality W:0.1~
1.0%, Nb:0.1~1.5%, Ti:0.1~3.0%, in Zr:0.1~3.0% any one or it is two or more.
In a kind of possible embodiment of the present invention, the chemical component of the wheel hub also contain according to quality W:0.1~
1.0%, Nb:0.1~1.0%, in Zr:0.1~0.9% any one or it is two or more.
In a kind of possible embodiment of the present invention, the thickness h of the transition zone meets following formula: h=[G wheel hub
(Mn)+G wheel hub (Cr)]/[G takes turns piece (Mn)+G wheel piece (Cr)], wherein G takes turns piece (Mn), G wheel piece (Cr) respectively indicates wheel piece chemistry
The mass fraction of Mn and Cr in component, G wheel hub (Mn), G wheel hub (Cr) respectively indicate the quality of Mn and Cr in wheel hub chemical constituent
Score, thickness unit are mm.
The present invention also provides a kind of methods of above-mentioned centrifugal casting agitator arm, comprising the following specific steps
S101, production casting mold: production agitator arm centrifugal rotation casting mold, centrifugal rotation casting mold includes left template and right mould
Plate fastens left template and right mould plate, forms forming cavity, and the shape of forming cavity is consistent with agitator arm outer profile, reserves and receives
Contracting amount is 2~3mm, and dimensional accuracy is ± 0.02mm；
S102, alloy melting
1) the first graphite crucible, melting wheel piece alloy at a temperature of 1550-1600 DEG C, by the melt in graphite crucible are selected
Stirring 1~carry out refinery by de-gassing after five minutes forms wheel piece alloy molten solution；
2) the second graphite crucible, melting wheel hub alloy at a temperature of 1550-1650 DEG C, by the melt in graphite crucible are selected
Stirring 3~carry out refinery by de-gassing after five minutes, forms wheel hub alloy melt；
S103, centrifugal casting: horizontal centrifuge is used, centrifugal rotation casting mold is placed on horizontal centrifuge, is first made above-mentioned
Wheel piece alloy molten solution fills type under the influence of centrifugal force, and then close linking, makes above-mentioned wheel hub alloy melt in the work of centrifugal force
With lower charging type, setting time is 8~15 minutes, finally demoulds, clears up casting.
In a kind of possible embodiment of the present invention, in step s 103, from casting is started to any moment in 5 seconds
It rises, implements continuous promptly increase centrifugal rotation casting mold revolving speed, the acceleration of centrifugal rotation casting mold rotation is 0.2~0.4m/s2,
It is the 35%~40% of the wheel piece alloy molten solution molten metal gross weight for needing to cast that piece alloy molten solution to be taken turns, which is cast to, centrifugal rotation casting
The acceleration of type rotation is 0.1~0.2m/s2。
In a kind of possible embodiment of the present invention, in step s 103, when the wheel hub alloy melt is cast, immediately
Centrifugal rotation casting mold revolving speed is continuously reduced, the acceleration of centrifugal rotation casting mold rotation is -0.01~-0.05m/s2, until casting
Part solidifies completely.
In a kind of possible embodiment of the present invention, in step s 103, the wheel piece alloy molten solution casting rate
15kg/min≤v≤20kg/min；The wheel hub alloy melt casting rate 12kg/min≤v≤18kg/min.
In a kind of possible embodiment of the present invention, in step s 103, the wheel piece alloy molten solution and wheel hub alloy
Pressure value when melt is cast is 200~400Pa.
In a kind of possible embodiment of the present invention, in step s 103, the wheel hub alloy melt cast temperature is
1450-1550℃。
In a kind of possible embodiment of the present invention, deposits when making to take turns piece alloy molten solution and be set in centrifugal rotation casting mold
Inner wall on when, the average surface temperature of slab is 0.95T to 0.98T, and wherein T (DEG C) is to take turns the solidification of piece alloy to start temperature
Degree.
3. beneficial effect
Compared with the prior art, the invention has the benefit that
(1) molten metal of the invention can form the Free Surface of agitator arm in casting mold, can not have to type core in this way
Spiral casting can be cast out, greatly simplify casting technique, productivity is high, at low cost；；
(2) present invention due to the effect of centrifugal force, improves feeding condition, gas and nonmetal inclusion are also easy to from liquid
It is discharged in metal, therefore the tissue of centrifugal casting is finer and close, shrinkage cavity (shrinkage porosite), stomata, the defects of being mingled with less, mechanical property
It is good；
(3) present invention eliminates or greatlys save the metal consumption in terms of running gate system and riser, and metal utilization is high.
Detailed description of the invention
Technical solution of the present invention is described in further detail below with reference to drawings and examples, but should
Know, these attached drawings are designed for task of explanation, therefore not as the restriction of the scope of the invention.In addition, except non-specifically
It points out, these attached drawings are meant only to conceptually illustrate structure construction described herein, without to be drawn to scale.
Fig. 1 is the structural schematic diagram of agitator arm of the present invention；
Fig. 2 is the side view of Fig. 1；
Fig. 3 is the centrifugal casting schematic diagram of 1 agitator arm of the embodiment of the present invention；
Fig. 4 is the centrifugal casting partial sectional view of 1 agitator arm of the embodiment of the present invention；
Fig. 5 is the apocarpy figure of 1 agitator arm of the embodiment of the present invention；
Fig. 6 is the transition zone schematic diagram of 1 agitator arm of the embodiment of the present invention.
Description of symbols in figure:
100, piece is taken turns；200, wheel hub；300, transition zone.
Specific embodiment
Hereafter to the detailed description of exemplary embodiment of the present invention with reference to attached drawing, which forms one of description
Point, it has been shown as example enforceable exemplary embodiment of the invention in the figure.Although these exemplary embodiment quilts
Sufficiently describe in detail so that those skilled in the art can implement the present invention, it is to be understood that can realize other embodiments and
Can without departing from the spirit and scope of the present invention to the present invention various changes can be made.Hereafter to the embodiment of the present invention
More detailed description is not limited to required the scope of the present invention, and just to be illustrated and do not limit pair
The description of the features of the present invention and feature to propose to execute best mode of the invention, and is sufficient to make those skilled in the art
It can implement the present invention.Therefore, the scope of the invention is only defined by the appended claims.
Hereafter detailed description of the present invention and example embodiment are more fully understood in combination with attached drawing, wherein of the invention
Element and feature are identified by appended drawing reference.
As shown in Figures 1 to 6, Fig. 1 and Fig. 2 is the structural schematic diagram of agitator arm, centrifugal casting paddle of the invention
Wheel, including wheel hub 200 and wheel piece 100,100 helical ring of wheel piece are located on wheel hub 200.Wheel piece 100 is contacted with material, therefore
Preferable wear-resisting property and higher intensity are needed, and wheel hub 200 is used as force transferring part, under large torque effect, has height
Intensity, the image of off-axis can be effectively reduced.
Wherein it is described wheel piece 100 chemical component contain C:2.3~3.0%, Si according to quality :≤1.0%, Mn:0.5~
1.0%, Cr:17~23%, Mo:0.3~0.8%, P :≤0.035%, S :≤0.06%, Ni:0~1.5%, Co:0~
1.0%, Cu:0~2.0%, remainder are Fe and inevitable impurity.
Further, it is described wheel piece 100 chemical component also contain according to quality W:0.1~1.0%, Nb:0.1~1.5%,
In Ti:0.1~3.0%, Zr:0.1~3.0% any one or it is two or more.
C mainly in conjunction with the alloying elements such as Mo, Mn, Cr, be improved by forming MC carbide wearability it is necessary at
Point.C not in conjunction with alloy is mainly solid-solution in matrix or pole and is imperceptibly precipitated, by matrix strengthening.MC carbon when C is less than 2.3%
The amount of compound is insufficient, cannot obtain enough wearabilities.On the other hand, when C is more than 3%, carbide is excessive, agitator arm
Heat-resisting cracking deteriorates.
Si works in the molten metal as deoxidier, when Si% be more than 1.0% hour wheel piece, 100 surface be easy embrittlement,
To influence wearability.
Mn have the function of it is fixed using the deoxidation of molten metal and impurity i.e. S as MnS, but when Mn is less than 0.3%, these
Effect is insufficient；On the other hand, it is easy to produce retained austenite when Mn is more than 0.8%, cannot steadily maintains hardness, thus
Wearability is easy to deteriorate.
Cr member prime system is to form carbide, and then improvement wheel 100 wearability of piece, with reinforcing matrix and the resistance to cracking of improvement
Property, on the other hand it, is very strong air chill element that then its content, which has to 17% or more, if more than 23%, solidifying
Containing the crystallization for interfering graphite during Gu.Preferably, Cr:17~22% or Cr:22~23%.
With forming M6C、M2The effect of the crystalline carbons compound such as C, and be dissolved in the base, bring hardenability raising and
Therefore the raising of tempering hardness contains 0.3% or more.But if Mo amount increase, as in agitator arm of the present invention most
The amount of the MC of hard carbon compound is reduced, thus, it is not preferred, therefore, is limited to 0.8% thereon.
Co is the effective element of reinforcing for matrix, good containing 0.1% or more effect.On the other hand, if being more than
5.0%, then toughness declines.
W is same as Mo, and the M of hard is generated in conjunction with C6C、M2C class carbide and solid solution in the base, strengthen matrix group
It knits, therefore is effectively, to have containing 0.1% or more for improving wear resistance.On the other hand, if more than 1.0%, M6C class
Carbide increases, therefore resistance to superficial roughness deterioration, is not preferred.
Nb, Ti, Zr generate MC class carbide in conjunction with C.When forming wheel piece 100 with centrifugal casting method, Nb, Ti, Zr tool
There is the effect for the segregation at least mitigating MC class carbide.
The chemical component of the wheel hub 200 according to quality contain C:0.3~0.4%, Si:0.6~0.9%, Mn:0.9~
1.2%, Cr:1.8~2.2%, Mo:0.3~0.8%, P :≤0.035%, S :≤0.035%, Ni:1.6~2.0%, Co:
0.3~0.8%, remainder is Fe and inevitable impurity.The carbon content of wheel hub 200 is less, has more iron, therefore, wheel
Hub 200 has high torque resistant intensity.
Further, the chemical component of the wheel hub 200 also contain according to quality W:0.1~1.0%, Nb:0.1~
1.0%, any one in Zr:0.1~0.9% or two or more.The addition of these elements can refine the interior of wheel hub 200
Portion's crystal grain, to improve bond strength.
As shown in fig. 6, the joining place of the wheel hub 200 and wheel piece 100 is formed with a transition zone 300, transition zone 300
Thickness h is 0.1mm~0.2mm.Preferably, under the influence of centrifugal force, when 200 alloy molten solution of wheel hub is cast, wheel piece 100 is closed
Golden melt ot-yet-hardened can have the phenomenon that infiltration between the two, show the transition zone 300 by lot of experimental data
Thickness h meets following formula: h=[G wheel hub (Mn)+G wheel hub (Cr)]/[G takes turns piece (Mn)+G wheel piece (Cr)], wherein G takes turns piece
(Mn), G takes turns the mass fraction that piece (Cr) respectively indicates Mn and Cr in wheel 100 chemical constituent of piece, G wheel hub (Mn), G wheel hub (Cr) point
Not Biao Shi in 200 chemical constituent of wheel hub Mn and Cr mass fraction, thickness unit is mm, brings above-mentioned numerical value into, h is max=
The min=0.1125mm of 0.1943mm, h.
Inventor analyzes possible reason, takes turns piece 100 and wheel hub 200 and is cast using different alloys, is guaranteeing two
Under the premise of person's bond strength, wheel piece 100 is consistent with the shrinking percentage of wheel hub 200, and the junction of the two is tightly combined, and will not be produced
Raw crackle, it is more preferable compared to the intensity of welding.
Embodiment 1
The method of the centrifugal casting agitator arm of the present embodiment, comprising the following specific steps
S101, production mold: production agitator arm centrifugal rotation mold, centrifugal rotation mold includes left template and right mould plate
(mold of the structure of the part and the prior art can be identical structure, but be not intended as emphasis of the invention), by left mould
Plate and right mould plate fasten, and form forming cavity, and the shape of forming cavity is consistent with agitator arm outer profile, and reserving shrinkage is 3mm,
Dimensional accuracy is ± 0.02mm；
S102, alloy melting
1) select the first graphite crucible, 100 alloy of melting wheel piece at a temperature of 1600 DEG C, wheel 100 alloy of piece chemistry at
Divide such as table 1, the melt stirring in graphite crucible is subjected to refinery by de-gassing after five minutes, forms wheel 100 alloy molten solution of piece；
2) select the second graphite crucible, 200 alloy of melting wheel hub at a temperature of 1550 DEG C, 200 alloy of wheel hub chemistry at
Divide such as table 2, the melt stirring in graphite crucible carries out refinery by de-gassing after five minutes, forms 200 alloy molten solution of wheel hub；
S103, centrifugal casting: using horizontal centrifuge, centrifugal rotation mold be placed on horizontal centrifuge, necessary here
Using horizontal centrifuge, it is mainly due to alloy solution under the effect of gravity, is easy to segregation phenomena occur, to cause
The occurrence of consistency of casting is poor, compares, and horizontal centrifuge can be to avoid this first makes above-mentioned 100 alloy molten solution of wheel piece
Type is filled under the influence of centrifugal force, then close linking, makes above-mentioned 200 alloy molten solution of wheel hub fill type under the influence of centrifugal force,
Setting time is 8 minutes, specifically, wheel 100 alloy molten solution of piece is cast at 1600 DEG C, is set using the alloy casting of the prior art
It is standby, for example, the centrifugal casting machine of the Wuxi sincere company of new Shye, when wheel 100 alloy molten solution of piece is cast to agitator arm gross mass 80%
When, stop casting, 200 alloy molten solution of wheel hub of switching casting immediately is cast at 1550 DEG C and (added to the alloy solution of melting
Heat is to 1550 DEG C), by above-mentioned smelting temperature it is found that the smelting temperature of wheel piece 100 and the smelting temperature of wheel hub 200 differ at least
300-350 DEG C, under centrifuge working condition, in the present embodiment, wheel T=1590 DEG C of setting temperature of 100 alloy of piece, when making
Wheel 100 alloy molten solution of piece is when deposit and being set on the inner wall of centrifugal rotation mold, the average surface temperature of slab for 0.95T extremely
0.98T, the i.e. average surface temperature of slab are 1510 DEG C to 1558 DEG C, and the temperature of 200 alloy solution of wheel hub is at 1550 DEG C, with wheel
The surface temperature of 100 slab of piece is almost the same, under the same conditions, so that wheel piece 100 is suitable with the shrinking percentage of wheel hub 200, keeps away
The joining place for exempting from wheel piece 100 and wheel hub 200 generates thermal stress, reduces a possibility that cracking, while improving the bond strength of the two；
It finally demoulds, clear up casting.
In step s 103, from starting casting to any moment in 5 seconds, implement continuously promptly to increase centrifugal rotation
Mold revolving speed, the acceleration of centrifugal rotation mold rotation are 0.4m/s2, 100 alloy molten solution of piece to be taken turns is cast to need to cast
Wheel 100 alloy molten solution molten metal gross weight of piece 40%, centrifugal rotation mold rotation acceleration be 0.2m/s2.Actually make
With in the process, due to wheel piece 100 Edge Distance center farther out, a biggish acceleration is provided early period, so that mould
The revolving speed of tool reaches setting speed as soon as possible, and revolving speed is at least 800r/min, maximum (top) speed 1500r/min, takes turns 100 alloy of piece
Melt under the action of the centrifugal force, is placed in the luminal border of mold, forms the marginal portion of wheel piece 100.
In step s 103, when 200 alloy molten solution of wheel hub is cast, centrifugal rotation mold is continuously reduced immediately and is turned
Speed, the acceleration of centrifugal rotation mold rotation are -0.05m/s2, until casting solidifies completely.Wheel is filled in entire forming cavity
100 alloy molten solution of piece, and under the influence of centrifugal force, the centre bit of wheel hub 200 is emptied and is stayed, is closed when starting casting wheel hub 200
When golden melt, if still keeping high speed rotation, then will lead to 200 alloy molten solution of wheel hub by got rid of to wheel piece 100 type chamber, in this way
The intensity and wear-resisting property that may cause wheel piece 100 decline to a great extent, and are unfavorable for the use of agitator arm.
In step s 103, the 100 alloy molten solution casting rate 15kg/min of wheel piece；200 alloy molten solution of wheel hub
Casting rate 18kg/min.
In step s 103, it is described wheel 100 alloy molten solution of piece and 200 alloy molten solution of wheel hub cast when pressure value be
400Pa.Vacuum pressure value when control casting can avoid generating face crack to avoid the oxidation of alloy molten solution.
The chemical component such as table 1 of specific wheel piece.
The chemical component of the wheel piece of table 1
The chemical component such as table 2 of specific wheel hub.
The chemical component of 2 wheel hub of table
The thickness h of the transition zone 300 meets following formula: h=[G wheel hub (Mn)+G wheel hub (Cr)]/[G wheel piece (Mn)+
G takes turns piece (Cr)]=(1.2+1.8)/(0.5+23)=0.1277mm.
Embodiment 2
The method of the centrifugal casting agitator arm of the present embodiment, specific steps and embodiment 1 are almost the same, and difference exists
In:
It is 2mm that S101, agitator arm centrifugal rotation mold, which reserve shrinkage, and dimensional accuracy is ± 0.02mm；
S102, alloy melting
1) select the first graphite crucible, 100 alloy of melting wheel piece at a temperature of 1560 DEG C, wheel 100 alloy of piece chemistry at
Divide such as table 1, refinery by de-gassing is carried out after the melt in graphite crucible is stirred 3 minutes, forms wheel 100 alloy molten solution of piece；
2) select the second graphite crucible, 200 alloy of melting wheel hub at a temperature of 1600 DEG C, 200 alloy of wheel hub chemistry at
Refinery by de-gassing is carried out after dividing such as table 2, the melt in graphite crucible to stir 3 minutes, forms 200 alloy molten solution of wheel hub；
S103, centrifugal casting: using horizontal centrifuge, centrifugal rotation mold be placed on horizontal centrifuge, when wheel piece 100
When alloy molten solution is cast to agitator arm gross mass 80%, stop casting, 200 alloy molten solution of wheel hub of switching casting immediately,
It casts (alloy solution of melting is carried out being heated to 1500 DEG C) at 1500 DEG C, in the present embodiment, takes turns the solidification of 100 alloy of piece
T=1545 DEG C of temperature, when making wheel 100 alloy molten solution of piece deposit and be set on the inner wall of centrifugal rotation mold, slab is put down
Equal surface temperature is 0.95T to 0.98T, i.e., the average surface temperature of slab is 1467 DEG C to 1514 DEG C, 200 alloy solution of wheel hub
Temperature at 1500 DEG C, it is almost the same with the surface temperature of wheel 100 slab of piece, under the same conditions, so that wheel piece 100 and wheel hub
A possibility that 200 shrinking percentage is suitable, avoids the joining place of wheel piece 100 and wheel hub 200 from generating thermal stress, reduces cracking, simultaneously
Improve the bond strength of the two；It finally demoulds, clear up casting.
In step s 103, from starting casting to any moment in 5 seconds, implement continuously promptly to increase centrifugal rotation
Mold revolving speed, the acceleration of centrifugal rotation mold rotation are 0.3m/s2, 100 alloy molten solution of piece to be taken turns is cast to need to cast
Wheel 100 alloy molten solution molten metal gross weight of piece 40%, centrifugal rotation mold rotation acceleration be 0.1m/s2。
In step s 103, when 200 alloy molten solution of wheel hub is cast, centrifugal rotation mold is continuously reduced immediately and is turned
Speed, the acceleration of centrifugal rotation mold rotation are -0.01m/s2, until casting solidifies completely.Wheel is filled in entire forming cavity
100 alloy molten solution of piece, and under the influence of centrifugal force, the centre bit of wheel hub 200 is emptied and is stayed, is closed when starting casting wheel hub 200
When golden melt, if still keeping high speed rotation, then will lead to 200 alloy molten solution of wheel hub by got rid of to wheel piece 100 type chamber, in this way
The intensity and wear-resisting property that may cause wheel piece 100 decline to a great extent, and are unfavorable for the use of agitator arm.
In step s 103, the 100 alloy molten solution casting rate 20kg/min of wheel piece；200 alloy molten solution of wheel hub
Casting rate 15kg/min.
In step s 103, it is described wheel 100 alloy molten solution of piece and 200 alloy molten solution of wheel hub cast when pressure value be
200Pa.Vacuum pressure value when control casting can avoid generating face crack to avoid the oxidation of alloy molten solution.
The thickness h of the transition zone 300 meets following formula: h=[G wheel hub (Mn)+G wheel hub (Cr)]/[G wheel piece (Mn)+
G takes turns piece (Cr)]=(1+2)/(1+20)=0.1429mm.
Embodiment 3
The method of the centrifugal casting agitator arm of the present embodiment, specific steps and embodiment 1 are almost the same, and difference exists
In:
It is 2.5mm that S101, agitator arm centrifugal rotation mold, which reserve shrinkage, and dimensional accuracy is ± 0.02mm；
S102, alloy melting
1) select the first graphite crucible, 100 alloy of melting wheel piece at a temperature of 1580 DEG C, wheel 100 alloy of piece chemistry at
Divide such as table 1, refinery by de-gassing is carried out after the melt in graphite crucible is stirred 1 minute, forms wheel 100 alloy molten solution of piece；
2) select the second graphite crucible, 200 alloy of melting wheel hub at a temperature of 1560 DEG C, 200 alloy of wheel hub chemistry at
Refinery by de-gassing is carried out after dividing such as table 2, the melt in graphite crucible to stir 3 minutes, forms 200 alloy molten solution of wheel hub；
S103, centrifugal casting: using horizontal centrifuge, centrifugal rotation mold be placed on horizontal centrifuge, when wheel piece 100
When alloy molten solution is cast to agitator arm gross mass 80%, stop casting, 200 alloy molten solution of wheel hub of switching casting immediately,
It casts (alloy solution of melting is carried out being heated to 1520 DEG C) at 1520 DEG C, in the present embodiment, takes turns the solidification of 100 alloy of piece
T=1570 DEG C of temperature, when making wheel 100 alloy molten solution of piece deposit and be set on the inner wall of centrifugal rotation mold, slab is put down
Equal surface temperature is 0.95T to 0.98T, i.e., the average surface temperature of slab is 1491 DEG C to 1538 DEG C, 200 alloy solution of wheel hub
Temperature at 1520 DEG C, it is almost the same with the surface temperature of wheel 100 slab of piece, under the same conditions, so that wheel piece 100 and wheel hub
A possibility that 200 shrinking percentage is suitable, avoids the joining place of wheel piece 100 and wheel hub 200 from generating thermal stress, reduces cracking, simultaneously
Improve the bond strength of the two；It finally demoulds, clear up casting.
In step s 103, from starting casting to any moment in 5 seconds, implement continuously promptly to increase centrifugal rotation
Mold revolving speed, the acceleration of centrifugal rotation mold rotation are 0.3m/s2, 100 alloy molten solution of piece to be taken turns is cast to need to cast
Wheel 100 alloy molten solution molten metal gross weight of piece 40%, centrifugal rotation mold rotation acceleration be 0.2m/s2。
In step s 103, when 200 alloy molten solution of wheel hub is cast, centrifugal rotation mold is continuously reduced immediately and is turned
Speed, the acceleration of centrifugal rotation mold rotation are -0.04m/s2, until casting solidifies completely.Wheel is filled in entire forming cavity
100 alloy molten solution of piece, and under the influence of centrifugal force, the centre bit of wheel hub 200 is emptied and is stayed, is closed when starting casting wheel hub 200
When golden melt, if still keeping high speed rotation, then will lead to 200 alloy molten solution of wheel hub by got rid of to wheel piece 100 type chamber, in this way
The intensity and wear-resisting property that may cause wheel piece 100 decline to a great extent, and are unfavorable for the use of agitator arm.
In step s 103, the 100 alloy molten solution casting rate 18kg/min of wheel piece；200 alloy molten solution of wheel hub
Casting rate 12kg/min.
In step s 103, it is described wheel 100 alloy molten solution of piece and 200 alloy molten solution of wheel hub cast when pressure value be
250Pa.Vacuum pressure value when control casting can avoid generating face crack to avoid the oxidation of alloy molten solution.
The thickness h of the transition zone 300 meets following formula: h=[G wheel hub (Mn)+G wheel hub (Cr)]/[G wheel piece (Mn)+
G takes turns piece (Cr)]=(0.9+2.2)/(0.8+21)=0.1422mm.
Embodiment 4
The method of the centrifugal casting agitator arm of the present embodiment, specific steps and embodiment 1 are almost the same, and difference exists
In:
It is 2.5mm that S101, agitator arm centrifugal rotation mold, which reserve shrinkage, and dimensional accuracy is ± 0.02mm；
S102, alloy melting
1) select the first graphite crucible, 100 alloy of melting wheel piece at a temperature of 1560 DEG C, wheel 100 alloy of piece chemistry at
Divide such as table 1, refinery by de-gassing is carried out after the melt in graphite crucible is stirred 4 minutes, forms wheel 100 alloy molten solution of piece；
2) select the second graphite crucible, 200 alloy of melting wheel hub at a temperature of 1650 DEG C, 200 alloy of wheel hub chemistry at
Refinery by de-gassing is carried out after dividing such as table 2, the melt in graphite crucible to stir 4 minutes, forms 200 alloy molten solution of wheel hub；
S103, centrifugal casting: using horizontal centrifuge, centrifugal rotation mold be placed on horizontal centrifuge, when wheel piece 100
When alloy molten solution is cast to agitator arm gross mass 80%, stop casting, 200 alloy molten solution of wheel hub of switching casting immediately,
It casts (alloy solution of melting is carried out being heated to 1510 DEG C) at 1510 DEG C, in the present embodiment, takes turns the solidification of 100 alloy of piece
T=1550 DEG C of temperature, when making wheel 100 alloy molten solution of piece deposit and be set on the inner wall of centrifugal rotation mold, slab is put down
Equal surface temperature is 0.95T to 0.98T, i.e., the average surface temperature of slab is 1472 DEG C to 1519 DEG C, 200 alloy solution of wheel hub
Temperature at 1510 DEG C, it is almost the same with the surface temperature of wheel 100 slab of piece, under the same conditions, so that wheel piece 100 and wheel hub
A possibility that 200 shrinking percentage is suitable, avoids the joining place of wheel piece 100 and wheel hub 200 from generating thermal stress, reduces cracking, simultaneously
Improve the bond strength of the two；It finally demoulds, clear up casting.
In step s 103, from starting casting to any moment in 5 seconds, implement continuously promptly to increase centrifugal rotation
Mold revolving speed, the acceleration of centrifugal rotation mold rotation are 0.4m/s2, 100 alloy molten solution of piece to be taken turns is cast to need to cast
Wheel 100 alloy molten solution molten metal gross weight of piece 40%, centrifugal rotation mold rotation acceleration be 0.1m/s2。
In step s 103, when 200 alloy molten solution of wheel hub is cast, centrifugal rotation mold is continuously reduced immediately and is turned
Speed, the acceleration of centrifugal rotation mold rotation are -0.05m/s2, until casting solidifies completely.Wheel is filled in entire forming cavity
100 alloy molten solution of piece, and under the influence of centrifugal force, the centre bit of wheel hub 200 is emptied and is stayed, is closed when starting casting wheel hub 200
When golden melt, if still keeping high speed rotation, then will lead to 200 alloy molten solution of wheel hub by got rid of to wheel piece 100 type chamber, in this way
The intensity and wear-resisting property that may cause wheel piece 100 decline to a great extent, and are unfavorable for the use of agitator arm.
In step s 103, the 100 alloy molten solution casting rate 16kg/min of wheel piece；200 alloy molten solution of wheel hub
Casting rate 15kg/min.
In step s 103, it is described wheel 100 alloy molten solution of piece and 200 alloy molten solution of wheel hub cast when pressure value be
300Pa.Vacuum pressure value when control casting can avoid generating face crack to avoid the oxidation of alloy molten solution.
The thickness h of the transition zone 300 meets following formula: h=[G wheel hub (Mn)+G wheel hub (Cr)]/[G wheel piece (Mn)+
G takes turns piece (Cr)]=(1.1+2.0)/(0.6+17)=0.1761mm.
Embodiment 5
The method of the centrifugal casting agitator arm of the present embodiment, specific steps and embodiment 1 are almost the same, and difference exists
In:
S101, agitator arm centrifugal rotation mold reserve shrinkage 3mm；
S102, alloy melting
1) select the first graphite crucible, 100 alloy of melting wheel piece at a temperature of 1600 DEG C, wheel 100 alloy of piece chemistry at
Divide such as table 1, refinery by de-gassing is carried out after the melt in graphite crucible is stirred 3 minutes, forms wheel 100 alloy molten solution of piece；
2) select the second graphite crucible, 200 alloy of melting wheel hub at a temperature of 1580 DEG C, 200 alloy of wheel hub chemistry at
Refinery by de-gassing is carried out after dividing such as table 2, the melt in graphite crucible to stir 3 minutes, forms 200 alloy molten solution of wheel hub；
S103, centrifugal casting: using horizontal centrifuge, centrifugal rotation mold be placed on horizontal centrifuge, when wheel piece 100
When alloy molten solution is cast to agitator arm gross mass 80%, stop casting, 200 alloy molten solution of wheel hub of switching casting immediately,
It casts (alloy solution of melting is carried out being heated to 1540 DEG C) at 1540 DEG C, in the present embodiment, takes turns the solidification of 100 alloy of piece
T=1590 DEG C of temperature, when making wheel 100 alloy molten solution of piece deposit and be set on the inner wall of centrifugal rotation mold, slab is put down
Equal surface temperature is 0.95T to 0.98T, i.e., the average surface temperature of slab is 1510 DEG C to 1558 DEG C, 200 alloy solution of wheel hub
Temperature at 1540 DEG C, it is almost the same with the surface temperature of wheel 100 slab of piece, under the same conditions, so that wheel piece 100 and wheel hub
A possibility that 200 shrinking percentage is suitable, avoids the joining place of wheel piece 100 and wheel hub 200 from generating thermal stress, reduces cracking, simultaneously
Improve the bond strength of the two；It finally demoulds, clear up casting.
In step s 103, from starting casting to any moment in 5 seconds, implement continuously promptly to increase centrifugal rotation
Mold revolving speed, the acceleration of centrifugal rotation mold rotation are 0.3m/s2, 100 alloy molten solution of piece to be taken turns is cast to need to cast
Wheel 100 alloy molten solution molten metal gross weight of piece 40%, centrifugal rotation mold rotation acceleration be 0.1m/s2。
In step s 103, when 200 alloy molten solution of wheel hub is cast, centrifugal rotation mold is continuously reduced immediately and is turned
Speed, the acceleration of centrifugal rotation mold rotation are -0.03m/s2, until casting solidifies completely.Wheel is filled in entire forming cavity
100 alloy molten solution of piece, and under the influence of centrifugal force, the centre bit of wheel hub 200 is emptied and is stayed, is closed when starting casting wheel hub 200
When golden melt, if still keeping high speed rotation, then will lead to 200 alloy molten solution of wheel hub by got rid of to wheel piece 100 type chamber, in this way
The intensity and wear-resisting property that may cause wheel piece 100 decline to a great extent, and are unfavorable for the use of agitator arm.
In step s 103, the 100 alloy molten solution casting rate 15kg/min of wheel piece；200 alloy molten solution of wheel hub
Casting rate 18kg/min.
In step s 103, it is described wheel 100 alloy molten solution of piece and 200 alloy molten solution of wheel hub cast when pressure value be
350Pa.Vacuum pressure value when control casting can avoid generating face crack to avoid the oxidation of alloy molten solution.
The thickness h of the transition zone 300 meets following formula: h=[G wheel hub (Mn)+G wheel hub (Cr)]/[G wheel piece (Mn)+
G takes turns piece (Cr)]=(1.2+1.9)/(0.8+18)=0.1649mm.
Embodiment 6
The method of the centrifugal casting agitator arm of the present embodiment, specific steps and embodiment 1 are almost the same, and difference exists
In:
S101, agitator arm centrifugal rotation mold reserve shrinkage 2mm；
S102, alloy melting
1) select the first graphite crucible, 100 alloy of melting wheel piece at a temperature of 1580 DEG C, wheel 100 alloy of piece chemistry at
Divide such as table 1, refinery by de-gassing is carried out after the melt in graphite crucible is stirred 1 minute, forms wheel 100 alloy molten solution of piece；
2) select the second graphite crucible, 200 alloy of melting wheel hub at a temperature of 1640 DEG C, 200 alloy of wheel hub chemistry at
Refinery by de-gassing is carried out after dividing such as table 2, the melt in graphite crucible to stir 3 minutes, forms 200 alloy molten solution of wheel hub；
S103, centrifugal casting: using horizontal centrifuge, centrifugal rotation mold be placed on horizontal centrifuge, when wheel piece 100
When alloy molten solution is cast to agitator arm gross mass 80%, stop casting, 200 alloy molten solution of wheel hub of switching casting immediately,
It casts (alloy solution of melting is carried out being heated to 1520 DEG C) at 1520 DEG C, in the present embodiment, takes turns the solidification of 100 alloy of piece
T=1570 DEG C of temperature, when making wheel 100 alloy molten solution of piece deposit and be set on the inner wall of centrifugal rotation mold, slab is put down
Equal surface temperature is 0.95T to 0.98T, i.e., the average surface temperature of slab is 1491 DEG C to 1538 DEG C, 200 alloy solution of wheel hub
Temperature at 1520 DEG C, it is almost the same with the surface temperature of wheel 100 slab of piece, under the same conditions, so that wheel piece 100 and wheel hub
A possibility that 200 shrinking percentage is suitable, avoids the joining place of wheel piece 100 and wheel hub 200 from generating thermal stress, reduces cracking, simultaneously
Improve the bond strength of the two；It finally demoulds, clear up casting.
In step s 103, from starting casting to any moment in 5 seconds, implement continuously promptly to increase centrifugal rotation
Mold revolving speed, the acceleration of centrifugal rotation mold rotation are 0.3m/s2, 100 alloy molten solution of piece to be taken turns is cast to need to cast
Wheel 100 alloy molten solution molten metal gross weight of piece 40%, centrifugal rotation mold rotation acceleration be 0.2m/s2。
In step s 103, when 200 alloy molten solution of wheel hub is cast, centrifugal rotation mold is continuously reduced immediately and is turned
Speed, the acceleration of centrifugal rotation mold rotation are -0.04m/s2, until casting solidifies completely.Wheel is filled in entire forming cavity
100 alloy molten solution of piece, and under the influence of centrifugal force, the centre bit of wheel hub 200 is emptied and is stayed, is closed when starting casting wheel hub 200
When golden melt, if still keeping high speed rotation, then will lead to 200 alloy molten solution of wheel hub by got rid of to wheel piece 100 type chamber, in this way
The intensity and wear-resisting property that may cause wheel piece 100 decline to a great extent, and are unfavorable for the use of agitator arm.
In step s 103, the 100 alloy molten solution casting rate 18kg/min of wheel piece；200 alloy molten solution of wheel hub
Casting rate 12kg/min.
In step s 103, it is described wheel 100 alloy molten solution of piece and 200 alloy molten solution of wheel hub cast when pressure value be
250Pa.Vacuum pressure value when control casting can avoid generating face crack to avoid the oxidation of alloy molten solution.
The thickness h of the transition zone 300 meets following formula: h=[G wheel hub (Mn)+G wheel hub (Cr)]/[G wheel piece (Mn)+
G takes turns piece (Cr)]=(0.9+1.8)/(0.5+20)=0.1317mm.
Embodiment 7
The method of the centrifugal casting agitator arm of the present embodiment, specific steps and embodiment 1 are almost the same, and difference exists
In:
It is 2mm that S101, agitator arm centrifugal rotation mold, which reserve shrinkage, and dimensional accuracy is ± 0.02mm；
S102, alloy melting
1) select the first graphite crucible, 100 alloy of melting wheel piece at a temperature of 1560 DEG C, wheel 100 alloy of piece chemistry at
Divide such as table 1, refinery by de-gassing is carried out after the melt in graphite crucible is stirred 4 minutes, forms wheel 100 alloy molten solution of piece；
2) select the second graphite crucible, 200 alloy of melting wheel hub at a temperature of 1620 DEG C, 200 alloy of wheel hub chemistry at
Refinery by de-gassing is carried out after dividing such as table 2, the melt in graphite crucible to stir 3 minutes, forms 200 alloy molten solution of wheel hub；
S103, centrifugal casting: using horizontal centrifuge, centrifugal rotation mold be placed on horizontal centrifuge, when wheel piece 100
When alloy molten solution is cast to agitator arm gross mass 80%, stop casting, 200 alloy molten solution of wheel hub of switching casting immediately,
It casts (alloy solution of melting is carried out being heated to 1510 DEG C) at 1510 DEG C, in the present embodiment, takes turns the solidification of 100 alloy of piece
T=1550 DEG C of temperature, when making wheel 100 alloy molten solution of piece deposit and be set on the inner wall of centrifugal rotation mold, slab is put down
Equal surface temperature is 0.95T to 0.98T, i.e., the average surface temperature of slab is 1472 DEG C to 1519 DEG C, 200 alloy solution of wheel hub
Temperature at 1510 DEG C, it is almost the same with the surface temperature of wheel 100 slab of piece, under the same conditions, so that wheel piece 100 and wheel hub
A possibility that 200 shrinking percentage is suitable, avoids the joining place of wheel piece 100 and wheel hub 200 from generating thermal stress, reduces cracking, simultaneously
Improve the bond strength of the two；It finally demoulds, clear up casting.
In step s 103, from starting casting to any moment in 5 seconds, implement continuously promptly to increase centrifugal rotation
Mold revolving speed, the acceleration of centrifugal rotation mold rotation are 0.25m/s2, 100 alloy molten solution of piece to be taken turns is cast to need to cast
Wheel 100 alloy molten solution molten metal gross weight of piece 40%, centrifugal rotation mold rotation acceleration be 0.1m/s2。
In step s 103, when 200 alloy molten solution of wheel hub is cast, centrifugal rotation mold is continuously reduced immediately and is turned
Speed, the acceleration of centrifugal rotation mold rotation are -0.025m/s2, until casting solidifies completely.Wheel is filled in entire forming cavity
100 alloy molten solution of piece, and under the influence of centrifugal force, the centre bit of wheel hub 200 is emptied and is stayed, is closed when starting casting wheel hub 200
When golden melt, if still keeping high speed rotation, then will lead to 200 alloy molten solution of wheel hub by got rid of to wheel piece 100 type chamber, in this way
The intensity and wear-resisting property that may cause wheel piece 100 decline to a great extent, and are unfavorable for the use of agitator arm.
In step s 103, the 100 alloy molten solution casting rate 18kg/min of wheel piece；200 alloy molten solution of wheel hub
Casting rate 15kg/min.
In step s 103, it is described wheel 100 alloy molten solution of piece and 200 alloy molten solution of wheel hub cast when pressure value be
280Pa.Vacuum pressure value when control casting can avoid generating face crack to avoid the oxidation of alloy molten solution.
The thickness h of the transition zone 300 meets following formula: h=[G wheel hub (Mn)+G wheel hub (Cr)]/[G wheel piece (Mn)+
G takes turns piece (Cr)]=(0.9+2.1)/(0.8+22)=0.1315mm.
Embodiment 8
The method of the centrifugal casting agitator arm of the present embodiment, specific steps and embodiment 1 are almost the same, and difference exists
In:
S101, agitator arm centrifugal rotation mold reserve shrinkage；
S102, alloy melting
1) select the first graphite crucible, 100 alloy of melting wheel piece at a temperature of 1600 DEG C, wheel 100 alloy of piece chemistry at
Divide such as table 1, refinery by de-gassing is carried out after the melt in graphite crucible is stirred 3 minutes, forms wheel 100 alloy molten solution of piece；
2) select the second graphite crucible, 200 alloy of melting wheel hub at a temperature of 1590 DEG C, 200 alloy of wheel hub chemistry at
Divide such as table 2, the melt stirring in graphite crucible carries out refinery by de-gassing after five minutes, forms 200 alloy molten solution of wheel hub；
S103, centrifugal casting: using horizontal centrifuge, centrifugal rotation mold be placed on horizontal centrifuge, when wheel piece 100
When alloy molten solution is cast to agitator arm gross mass 80%, stop casting, 200 alloy molten solution of wheel hub of switching casting immediately,
It casts (alloy solution of melting is carried out being heated to 1550 DEG C) at 1550 DEG C, by above-mentioned smelting temperature it is found that taking turns piece 100
The smelting temperature of smelting temperature and wheel hub 200 differs at least 300-350 DEG C, under centrifuge working condition, in the present embodiment,
T=1590 DEG C of setting temperature of 100 alloy of piece is taken turns, deposits when making to take turns 100 alloy molten solution of piece and is set in centrifugal rotation mold
When on inner wall, the average surface temperature of slab is 0.95T to 0.98T, i.e., the average surface temperature of slab is 1510 DEG C to 1558
DEG C, the temperature of 200 alloy solution of wheel hub is almost the same with the surface temperature of wheel 100 slab of piece at 1550 DEG C, in the same terms
Under, so that wheel piece 100 is suitable with the shrinking percentage of wheel hub 200, avoids the joining place of wheel piece 100 and wheel hub 200 from generating thermal stress, subtract
A possibility that cracking less, while improving the bond strength of the two；It finally demoulds, clear up casting.
In step s 103, from starting casting to any moment in 5 seconds, implement continuously promptly to increase centrifugal rotation
Mold revolving speed, the acceleration of centrifugal rotation mold rotation are 0.4m/s2, 100 alloy molten solution of piece to be taken turns is cast to need to cast
Wheel 100 alloy molten solution molten metal gross weight of piece 40%, centrifugal rotation mold rotation acceleration be 0.15m/s2。
In step s 103, when 200 alloy molten solution of wheel hub is cast, centrifugal rotation mold is continuously reduced immediately and is turned
Speed, the acceleration of centrifugal rotation mold rotation are -0.045m/s2, until casting solidifies completely.Wheel is filled in entire forming cavity
100 alloy molten solution of piece, and under the influence of centrifugal force, the centre bit of wheel hub 200 is emptied and is stayed, is closed when starting casting wheel hub 200
When golden melt, if still keeping high speed rotation, then will lead to 200 alloy molten solution of wheel hub by got rid of to wheel piece 100 type chamber, in this way
The intensity and wear-resisting property that may cause wheel piece 100 decline to a great extent, and are unfavorable for the use of agitator arm.
In step s 103, the 100 alloy molten solution casting rate 16kg/min of wheel piece；200 alloy molten solution of wheel hub
Casting rate 15kg/min.
In step s 103, it is described wheel 100 alloy molten solution of piece and 200 alloy molten solution of wheel hub cast when pressure value be
400Pa.Vacuum pressure value when control casting can avoid generating face crack to avoid the oxidation of alloy molten solution.
The thickness h of the transition zone 300 meets following formula: h=[G wheel hub (Mn)+G wheel hub (Cr)]/[G wheel piece (Mn)+
G takes turns piece (Cr)]=(1.2+2.2)/(1+17)=0.1889mm.
The obtained agitator arm of 1-8 of the embodiment of the present invention is tested for the property, performance indicator is as follows:
| Take turns sheet hardness/HRC | Wheel hub hardness/HRC | |
| Embodiment 1 | 62 | 38 |
| Embodiment 2 | 64 | 40 |
| Embodiment 3 | 65 | 42 |
| Embodiment 4 | 63 | 39 |
| Embodiment 5 | 60 | 40 |
| Embodiment 6 | 62 | 40 |
| Embodiment 7 | 61 | 39 |
| Embodiment 8 | 63 | 41 |
Claims (14)
1. a kind of centrifugal casting agitator arm, including wheel hub (200) and wheel piece (100), wheel piece (100) helical ring are located at wheel
On hub (200), which is characterized in that wherein the chemical component of wheel piece (100) contains C:2.3~3.0%, Si according to quality:
≤ 1.0%, Mn:0.5~1.0%, Cr:17~23%, Mo:0.3~0.8%, P :≤0.035%, S :≤0.06%, Ni:0~
1.5%, Co:0~1.0%, Cu:0~2.0%, remainder are Fe and inevitable impurity；The wheel hub (200) chemistry at
Point according to quality contain C:0.3~0.4%, Si:0.6~0.9%, Mn:0.9~1.2%, Cr:1.8~2.2%, Mo:0.3~
0.8%, P :≤0.035%, S :≤0.035%, Ni:1.6~2.0%, Co:0.3~0.8%, remainder is for Fe and unavoidably
Impurity.
2. centrifugal casting agitator arm according to claim 1, which is characterized in that the wheel hub (200) and wheel piece (100)
Joining place be formed with a transition zone (300), the thickness h of transition zone (300) is 0.1mm~0.2mm.
3. centrifugal casting agitator arm according to claim 1 or 2, which is characterized in that it is described wheel piece (100) chemistry at
Contain C:2.3~3.0%, Si point according to quality :≤1.0%, Mn:0.5~1.0%, Cr:17~22%, Mo:0.3~
0.8%, P :≤0.035%, S :≤0.06%, Ni:0~1.5%, Co:0~1.0%, Cu:0~2.0%, remainder is for Fe and not
Evitable impurity.
4. centrifugal casting agitator arm according to claim 1 or 2, which is characterized in that it is described wheel piece (100) chemistry at
Contain C:2.3~3.0%, Si point according to quality :≤1.0%, Mn:0.5~1.0%, Cr:22~23%, Mo:0.3~
0.8%, P :≤0.035%, S :≤0.06%, Ni:0~1.5%, Co:0~1.0%, Cu:0~2.0%, remainder is for Fe and not
Evitable impurity.
5. centrifugal casting agitator arm according to claim 1, which is characterized in that the chemical component of wheel piece (100)
According to quality also containing any in W:0.1~1.0%, Nb:0.1~1.5%, Ti:0.1~3.0%, Zr:0.1~3.0%
It is one or more kinds of.
6. centrifugal casting agitator arm according to claim 1, which is characterized in that the chemical component of the wheel hub (200)
According to quality also containing in W:0.1~1.0%, Nb:0.1~1.0%, Zr:0.1~0.9% any one or it is two or more.
7. centrifugal casting agitator arm according to claim 6, which is characterized in that the thickness h of the transition zone (300) is full
Sufficient following formula: h=[G wheel hub (Mn)+G wheel hub (Cr)]/[G takes turns piece (Mn)+G wheel piece (Cr)].
8. a kind of method of the centrifugal casting agitator arm as described in any one of claim 1 to 7, which is characterized in that including following
Specific steps:
S101, production casting mold: production agitator arm centrifugal rotation casting mold, centrifugal rotation casting mold include left template and right mould plate, are incited somebody to action
Left template and right mould plate fasten, and form forming cavity, and the shape of forming cavity is consistent with agitator arm outer profile, reserve shrinkage；
S102, alloy melting
1) the first graphite crucible is selected, melting wheel piece (100) alloy at a temperature of 1550-1600 DEG C will be molten in graphite crucible
Liquid stirring 1~carry out refinery by de-gassing after five minutes forms wheel piece (100) alloy molten solution；
2) the second graphite crucible is selected, melting wheel hub (200) alloy at a temperature of 1550-1650 DEG C will be molten in graphite crucible
Liquid stirring 3~carry out refinery by de-gassing after five minutes, forms wheel hub (200) alloy molten solution；
S103, centrifugal casting: horizontal centrifuge is used, centrifugal rotation casting mold is placed on horizontal centrifuge, above-mentioned wheel piece is first made
(100) alloy molten solution fills type under the influence of centrifugal force, and then close linking, is being centrifuged above-mentioned wheel hub (200) alloy molten solution
Type is filled under the action of power, setting time is 8~15 minutes, finally demoulds, clears up casting.
9. the method for centrifugal casting agitator arm according to claim 8, which is characterized in that in step s 103, from opening
Casting begin to any moment in 5 seconds, implements continuously promptly to increase centrifugal rotation casting mold revolving speed, the rotation of centrifugal rotation casting mold
Acceleration be 0.2~0.4m/s2, piece (100) alloy molten solution to be taken turns is cast to need wheel piece (100) alloy molten solution for casting
The 35%~40% of molten metal gross weight, the acceleration of centrifugal rotation casting mold rotation are 0.1~0.2m/s2。
10. the method for centrifugal casting agitator arm according to claim 8, which is characterized in that in step s 103, described
When wheel hub (200) alloy molten solution is cast, centrifugal rotation casting mold revolving speed, the acceleration of centrifugal rotation casting mold rotation are continuously reduced immediately
Degree is -0.01~-0.05m/s2, until casting solidifies completely.
11. the method for centrifugal casting agitator arm according to claim 8, which is characterized in that in step s 103, described
Take turns piece (100) alloy molten solution casting rate 15kg/min≤v≤20kg/min；Wheel hub (200) the alloy molten solution casting rate
12kg/min≤v≤18kg/min。
12. the method for centrifugal casting agitator arm according to claim 8, which is characterized in that in step s 103, described
Pressure value when taking turns piece (100) alloy molten solution and the casting of wheel hub (200) alloy molten solution is 200~400Pa.
13. the method for centrifugal casting agitator arm according to claim 8, which is characterized in that in step s 103, described
Wheel hub (200) alloy molten solution cast temperature is 1450-1550 DEG C.
14. the method for centrifugal casting agitator arm according to claim 8, which is characterized in that when make take turns piece (100) alloy
When melt deposits and is set on the inner wall of centrifugal rotation casting mold, the average surface temperature of slab is 0.95T to 0.98T, wherein T
(DEG C) is the solidification start temperature for taking turns piece (100) alloy.
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