CN108149154A - High-voltage motor highly stressed rotor forging shaft and heat treatment processing method - Google Patents
High-voltage motor highly stressed rotor forging shaft and heat treatment processing method Download PDFInfo
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- CN108149154A CN108149154A CN201711251074.2A CN201711251074A CN108149154A CN 108149154 A CN108149154 A CN 108149154A CN 201711251074 A CN201711251074 A CN 201711251074A CN 108149154 A CN108149154 A CN 108149154A
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
-
- 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
-
- 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
-
- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
Abstract
The present invention relates to one kind under the premise of high-voltage motor rotor axis root diameter is up to 1040mm, the high-voltage motor highly stressed rotor axis processing method of high-pressure unit armature spindle running stability requirement, armature spindle processing disclosure satisfy that：A. bearing guard circularity requires to control in 0.006mm, lathe in machining, center rest support idler wheel tooling is improved to the plane bracket watt of babbit material, friction mode is changed to sliding friction by rolling friction；After process is transferred to grinding machine fine grinding, when after mill amount is milled to 0.3mm, ageing treatment 1 week is stood, dimensioned is in place as required；B. highest bearing guard region is required in axis, that is flatness 0.012mm, verticality is relative to bearing rib 0.012mm, when bearing shell surface roughness is below 0.63, using the integrally joint processing of plane, end face, controlled using grinding wheel registration, plane of grinding wheel is trimmed to the fritter contact surface of back taper using boart boart flywheel knife, bearing shell plane is ground with feeding mode in processing, ensures that flatness is controlled in 0.008mm, degree control is in 0.005mm；C. armature spindle large cylindrical surface amounts to 144 threaded holes with chamfering, is processed and formed at one time technology using composite drill, pre-determined bit bores chamfering, bores the completion of one step of thread Pilot hole.
Description
Technical field
The present invention relates to one kind under the premise of high-voltage motor rotor axis root diameter is up to 1040mm, high-pressure unit disclosure satisfy that
The high-voltage motor highly stressed rotor axis processing method of armature spindle running stability requirement, belongs to high-voltage electricity arbor manufacturing field.
Background technology
With the continuous construction of current global ocean economy, shipping industry is kept on improving, and traditional low voltage motor is
The demand of not competent ship electric power, and gradually replaced by high pressure and super-pressure motor, the high-end manufacture of high-voltage motor is
Gradually embody its importance.Domestic at present for large high-voltage motor manufacture, there are still technical bottlenecks, whole when such as running at high speed
The stability of body motor, the compatibility between internal each key components and parts etc., is both needed to further research and analyse.Armature spindle is high-voltage electricity
The most crucial component part of machine, quality good or not directly affect the runs of whole motor, such high-strength large-scale turns at present
There is only the bottlenecks in material for sub- axis processing, and by import, and difficulty of processing is very big, it is desirable that the requirement of bearing guard circularity needs
It controls in 0.006mm, requiring highest bearing guard region in axis, (flatness 0.012mm, verticality is relative to bearing rib
0.012mm, bearing shell surface roughness 0.63 hereinafter, ensure flatness control in 0.008mm, degree control in 0.005mm, and
And the disposable completion armature spindle large cylindrical surface of needs amounts to 144 threaded holes with chamfering and hole position position degree is accurate.
Invention content
Purpose of design：At home on the basis of material, according to the technical parameter of high-voltage motor, design a kind of high-voltage motor and turn
Under the premise of sub- axis root diameter reaches 1040mm, it disclosure satisfy that the high-voltage motor of high-pressure unit armature spindle running stability requirement is high
Intensity rotor shaft processing method.
Designing scheme：In order to realize above-mentioned purpose of design.1st, high-voltage motor is set with highly stressed rotor forging shaft optimizing components
Meter：The mechanical performance of material is determined by its metallographic structure, and metallographic structure and the chemical composition of material and heat treatment side
Formula is closely related.So suitable chemical composition is selected to have extremely main function to the research and development of the application.According to rotor axis of electric
Intensity, impact flexibility requirement it is high, the features such as size is big, the material that quenching degree will be selected good when selecting material, and in institute
In some structure steel materials, chrome-nickel-molybdenum steel just has this feature.Following table is the chemical composition standard of two kinds of common chrome-nickel-molybdenum steels.
The chemical composition of 34CrNiMo6 and 40CrNiMoA
From the point of view of the service condition of both materials, the impact property of 34CrNiMo6 is fine, but tensile strength is not
Foot, 40CrNiMoA is then on the contrary, the therefore effect between the application combination each element and the characteristics of both materials, by multiple
Repetition test, detection, optimization, which is selected, disclosure satisfy that purpose of design material of the present invention：C：0.30-0.36%；Si：0.17-
0.37%；Mn:0.25-0.50%；P, S≤0.020%；Cr:1.30-1.60%；Mo；0.20-0.35%；Ni；1.30-
1.60%.Furthermore, it is contemplated that the diameter of armature spindle is very big, coarse-grain phenomenon is susceptible in production, so addition 0.04-0.10%
Vanadium carry out crystal grain thinning.2nd, the chrome-nickel-molybdenum steel steel ingot after optimized, since material C r, the Ni content is higher, the hot-working plastic of steel
Property and thermal conductivity of material it is relatively poor, conventional production technology can not ensure its product inherent high quality requirement.Therefore, it needs
It is several by the selection of material ingot shape, Heating Steel Ingots requirement, the optimization of forging deformation technique and forging beginning, the control of final forging temperature
The control of a link is realized.First in the selection of the ingot shape of material, to ensure that forging has sufficiently large forging deformation amount,
The selected Ingot Type of forging process for fuel production is necessary for the asthenic steel ingot that material section ratio of height to diameter is more than 2；Secondly, steel ingot
Heating must use heat stepwise, ensure that the inside and outside portion of steel ingot is heated evenly and interior tissue complete austenitizing；Again, turn
Sub- forging shaft is because axle body section of diameter is larger, and to ensure that it has forging ratio, forging process uses the upsetting pull twice of tablet heavy reduction
Deformation novel technique, eliminate as cast condition that may be present segregation and rarefaction defect, forming process inside steel ingot and use small pressure
Amount is quick to pull out forging technology to ensure the forging roundness of forging；Finally, the entire forging process of rotor forging shaft is divided to two fire
Secondary completion, initial forging temperature are controlled at 1230 DEG C；Finishing before the final forming of forging, after temperature naturally cools to 850 DEG C
The phenomenon that forging, avoiding blank crystal grain excessive forges final finishing temperature not less than 800 DEG C.3rd, heat treatment after forging：Blank forging
After, bond material self character designs a kind of novel thermal process technique, which includes the first heat treatment
Technique and second heat treatment (quenched) technique, so as to which tradition be replaced to expand hydrogen technology (attached drawing 4).The novel thermal process technique
Theoretical foundation：After material itself is optimized, the content of Cr, Ni, Mo are relatively higher, and material in itself increases the sensibility that white point generates
Add, product rejection probability improves, this is needed by being heat-treated science control；Material thermal conductivity itself and plasticity are poor, through pressing greatly
After lower amount upsetting pull, forging stress is very big, if Direct Air-Cooled after forging, if internal stress natrual ageing discharges, can make surface that may go out
Crack defect etc. caused by existing forging stress；During product modifier treatment, to reach the requirement of inside and outside high intensity, when quenching is necessary
First carry out the quenching technical of water quenching, rear oil cooling, it is ensured that surface zero defect generates during quenching, it is necessary to possess before quenching stable
Structural state.(1) novel first heat treatment is compared compared with traditional handicraft, is had the following advantages：A. first empty stove adds the first heat-treatment furnace
Heat is to 650 DEG C of heat preservations, and after blank forging, about 800 DEG C of workpiece temperature, directly shove charge heat preservation after standing is air-cooled to 650 DEG C can
The drawbacks of avoiding making internal-external temperature difference excessive due to material poor thermal conductivity itself makes workpiece inside and outside temperature consistent, ensures that tissue is equal
Even property；B.650 after a DEG C heat preservation 6h eliminates forging stress, 300 DEG C are furnace-cooled to the rate of≤35 DEG C/h, 300 DEG C of heat preservation 6h make Austria
Family name's body fully changes, after with the temperature of≤80 DEG C/h be warming up to 880 DEG C, and keep the temperature 8h, make interior tissue complete austenitizing, it is brilliant
Boundary rearranges, and makes even tissue careful；C. 650 DEG C are warming up to after being furnace-cooled to after 300 DEG C heat preservation again, keeps the temperature 15h, then with
≤ 30 DEG C/h is furnace-cooled to≤100 DEG C and comes out of the stove air-cooled, substantially eliminates internal hydrogen that may be present, final structural state is stable
Ferrite+pearlitic structrure.
The optimization of (2) second heat treatments (modifier treatment)：A. heat stepwise guarantee is heated evenly, steady based on the first heat treatment
On the basis of determining tissue, using water quenching and oil-cooling technique, 250 DEG C of x6h heat preservations are first carried out before tempering, to obtain geneva as much as possible
Body tissue；B. being furnace-cooled to after 300 DEG C with≤30 DEG C/h after being tempered comes out of the stove air-cooled, avoids the generation of temper brittleness, makes production
Product can have stable tough while having high intensity low residual stress.
Technical solution：A kind of high-voltage motor highly stressed rotor axis processing method, (1) armature spindle material production quality percentage
Number：
C 0.30-0.36%, Si0.17-0.37%, Mn0.25-0.50%, P and S≤0.020%, Cr1.30-
1.60%th, Mo0.20-0.35%, Ni 1.30-1.60%, V0.04-0.10%；
(2) heat treatment after forging and quenched：A. heat treatment after forging：After forging process for fuel, first stand and be air-cooled to forging surface
For in 650 DEG C of annealing furnace to be expected, 6 hours are kept the temperature at 650 DEG C, the stress generated when being forged with eliminating, then be less than 35 DEG C/
The cooling rate of h is cooled to 300 DEG C, and keeps the temperature 6 hours at 300 DEG C, and the austenite structure of forging is made fully to change；300 DEG C of heat preservations terminate
880 DEG C are heated to be not more than the speed of 80 DEG C/h afterwards, and keep the temperature 8 hours, make after inside workpiece complete austenitizing with little
300 DEG C are furnace-cooled in the cooling velocity of 35 DEG C/h and keeps the temperature 6 hours, and austenite structure is made fully to be changed into ferrite and pearly-lustre
Body；Again be not more than the speed of 80 DEG C/h be heated to 650 DEG C and keep the temperature 15 hours, carry out tempering expand hydrogen processing, finally with little
In the cooling velocity of 30 DEG C/h be furnace-cooled to less than 100 DEG C come out of the stove it is air-cooled；B. modifier treatment：Heat stepwise guarantee is heated evenly, base
On the basis of the first heat treatment stabilizing tissue, using water quenching and oil-cooling technique, 250 DEG C of x6h heat preservations are first carried out before tempering, to obtain
Martensitic structure as much as possible；650 DEG C of heat preservation 5h are due to workpiece internal-external temperature difference mistake when heating in order to prevent during Quench heating
It is big that workpiece deformation is caused even to crack, using oil cooling 140 minutes again of water cooling 40 minutes during quenching, 250 DEG C of heat preservations after quenching：
(3) armature spindle is processed：A. bearing guard circularity requires to control in 0.006mm, lathe in machining, by centre frame
Back-up roller wheel tooling is improved to the plane bracket watt of babbit material, and friction mode is changed to sliding friction by rolling friction；Work
After sequence is transferred to grinding machine fine grinding, when after mill amount is milled to 0.3mm, ageing treatment is stood after 1 week, and dimensioned is in place as required；b.
Highest bearing guard region is required in axis, i.e. flatness 0.012mm, for verticality relative to bearing rib 0.012mm, bearing shell end face is thick
When rugosity is below 0.63, using the integrally joint processing of plane, end face, is controlled using grinding wheel registration, use skive
Plane of grinding wheel is trimmed to the fritter contact surface of back taper by knife, is ground bearing shell plane with feeding mode in processing, is ensured flatness
It controls in 0.008mm, degree control is in 0.005mm；C. armature spindle large cylindrical surface amounts to 144 threaded holes with chamfering,
Technology is processed and formed at one time using composite drill, pre-determined bit bores chamfering, bores the completion of one step of thread Pilot hole.
The present invention is compared with background technology, first, the reproduction that high-voltage motor rotor axis is realized with home made materials is had developed,
The all technical of its rotor axis of electric has reached design requirement, and the mechanical performance of rotor axis of electric is detected through third party,
Performance complies fully with design requirement, i.e. yield strength Re >=600MPa；800~900MPa of tensile strength Rm；Elongation percentage A >=
16.0%；Contraction percentage of area Z >=55.0%；Notched bar impact strength AKv >=32J (20 DEG C)；Second is that the ultrasonic examination warp of armature spindle
ABS classification societies are detected, and pass through the certification of LiaoABSChuan Jian societies；Third, high precision machining, it is ensured that when running at high speed, integrated motor
Stability.
Description of the drawings
Fig. 1 is the structure diagram of high-voltage motor highly stressed rotor axis.
Fig. 2 is high-voltage motor highly stressed rotor forging shaft heat treatment after forging process schematic representation.
Fig. 3 is schematic diagram after high-voltage motor highly stressed rotor forging shaft is quenched.
Fig. 4 is forging steel ingot heating process schematic diagram.
Fig. 5 is existing expansion hydrogen process schematic representation.
Specific embodiment
Embodiment 1：With reference to attached drawing 1-5.A kind of high-voltage motor highly stressed rotor axis processing method, (1) armature spindle material
Production quality percentage：C 0.30-0.36%, Si0.17-0.37%, Mn0.25-0.50%, P and S≤0.020%,
Cr1.30-1.60%, Mo0.20-0.35%, Ni 1.30-1.60%, V0.04-0.10%；
(2) heat treatment after forging and quenched：
A. heat treatment after forging：After forging process for fuel, the annealing furnace to be expected for being air-cooled to that forging surface is 650 DEG C is first stood
In, 6 hours are kept the temperature at 650 DEG C, then the stress that generates when being forged with eliminating is cooled to 300 DEG C to be less than the cooling rate of 35 DEG C/h, and
6 hours are kept the temperature at 300 DEG C, the austenite structure of forging is made fully to change；To be not more than the speed of 80 DEG C/h after 300 DEG C of heat preservations
Degree is heated to 880 DEG C, and keeps the temperature 8 hours, makes after inside workpiece complete austenitizing to be not more than the cooling velocity stove of 35 DEG C/h
It is cooled to 300 DEG C and keeps the temperature 6 hours, austenite structure is made fully to be changed into ferrite and pearlite；Again to be not more than 80 DEG C/h's
Speed is heated to 650 DEG C and keeps the temperature 15 hours, carries out tempering and expands hydrogen processing, finally to be not more than the cooling velocity furnace cooling of 30 DEG C/h
It comes out of the stove to less than 100 DEG C air-cooled；
B. modifier treatment：Heat stepwise guarantee is heated evenly, on the basis of the first heat treatment stabilizing tissue, using water
It quenches oil cooling technique, 250 DEG C of x6h is first carried out before tempering and are kept the temperature, to obtain martensitic structure as much as possible；650 during Quench heating
DEG C heat preservation 5h is that workpiece deformation is caused even to crack when heating in order to prevent since workpiece internal-external temperature difference is excessive, and water is used during quenching
Cold 40 minutes oil cooling 140 minutes again, 250 DEG C of heat preservations after quenching：
(3) armature spindle is processed：
A. bearing guard circularity requires to control in 0.006mm, lathe in machining, and center rest support idler wheel tooling is changed
Into the plane bracket watt for babbit material, friction mode is changed to sliding friction by rolling friction；Process is transferred to grinding machine fine grinding
Afterwards, when after mill amount is milled to 0.3mm, ageing treatment is stood after 1 week, and dimensioned is in place as required；
B. require highest bearing guard region in axis, i.e. flatness 0.012mm, verticality relative to bearing rib 0.012mm,
When bearing shell surface roughness is below 0.63, using the integrally joint processing of plane, end face, is controlled, used using grinding wheel registration
Plane of grinding wheel is trimmed to the fritter contact surface of back taper by boart boart flywheel knife, and bearing shell plane is ground with feeding mode in processing,
Ensure that flatness is controlled in 0.008mm, degree control is in 0.005mm；
C. armature spindle large cylindrical surface amounts to 144 threaded holes with chamfering, and technology is processed and formed at one time using composite drill,
Pre-determined bit bores chamfering, bores the completion of one step of thread Pilot hole.
Yield strength Re >=600MPa；800~900MPa of tensile strength Rm；Elongation percentage A >=16.0%；Contraction percentage of area Z
>=55.0%；Notched bar impact strength AKv >=32J (20 DEG C).
1st, it forges：Forging process has extremely important influence to product inherent quality.First, from the selection of ingot shape, it is
Ensure there are enough forging deformation amounts, selected the 30T steel ingots of asthenic；In order to mitigate shadow of the segregation in raw material to product
It rings, the appropriate extension of the high-temperature holding time in Heating Process of Ingots is extended to 12 hours for 8 hours by conventional.Heater
Skill such as Fig. 4.
2nd, the heat treatment after forging：The purpose of heat treatment after forging mainly changes the metallographic structure of forging, obtains equal
Even pearlite and ferritic structure is prepared to be quenched.Secondly, the internal stress and hardness for reduction forging is machining
It prepares.Since the nickel element content of the material is higher, white-spot defects are easily generated, forging is caused to scrap, therefore expand protium
It is also the free-revving engine after forging.After forging process for fuel, first stand be air-cooled to forging surface be 650 DEG C treat material annealing
In stove, 6 hours are kept the temperature at 650 DEG C, then the stress generated when being forged with eliminating is cooled to 300 DEG C to be less than the cooling rate of 35 DEG C/h,
And 6 hours are kept the temperature at 300 DEG C, the austenite structure of forging is made fully to change；To be not more than 80 DEG C/h's after 300 DEG C of heat preservations
Speed is heated to 880 DEG C, and keeps the temperature 8 hours, makes after inside workpiece complete austenitizing to be not more than the cooling velocity of 35 DEG C/h
It is furnace-cooled to 300 DEG C and keeps the temperature 6 hours, austenite structure is made fully to be changed into ferrite and pearlite；Again to be not more than 80 DEG C/h
Speed be heated to 650 DEG C and keep the temperature 15 hours, carry out tempering and expand hydrogen processing, finally to be not more than the cooling velocity stove of 30 DEG C/h
Be cooled to less than 100 DEG C come out of the stove it is air-cooled.Fig. 3 is the process curve figure of heat treatment after forging.
3rd, modifier treatment：The purpose of modulation treatment is to improve its comprehensive mechanical property.Fig. 4 is rotor forging shaft
Modulating treatment process figure：650 DEG C of heat preservation 5h are to be caused when heating in order to prevent since workpiece internal-external temperature difference is excessive during Quench heating
Workpiece deformation is even cracked.Using oil cooling 140 minutes again of water cooling 40 minutes during quenching.Purpose is to improve the through hardening layer depth of workpiece
Degree improves the mechanical performance of workpiece.250 DEG C of heat preservations after quenching, it is therefore an objective to austenite be made fully to change, reduced as far as possible remaining difficult to understand
Family name's body content, to improve armature spindle dimensional stability.And furnace cooling is the residual stress in order to reduce armature spindle after being tempered, and prevents essence
It is deformed in process.
4th, the finishing of rotor axis of electric：
It, will since bearing guard circularity requires that in 0.006mm, lathe in machining (unilateral surplus 0.6mm surpluses) need to be controlled
Center rest support idler wheel tooling is improved to the plane bracket watt of babbit material, and friction mode is changed to slide and be rubbed by rolling friction
It wipes, on the one hand increases centre frame load-bearing, while ensure that the precision higher of the centre bore in fine grinding；Process is transferred to grinding machine essence
After mill, because workpiece intensity itself is higher, cutting stress is larger, after mill amount is milled to 0.3mm, stands ageing treatment after 1 week, by will
Seek dimensioned in place；
Requiring highest bearing guard region in axis, (flatness 0.012mm, verticality is relative to bearing rib 0.012mm, bearing shell
Below surface roughness 0.63), using plane, end face integrally joint processing technology technique, avoid repeated clamping, positioning caused by
Error, grinding wheel registration control, specific purpose tool correct plane of grinding wheel degree, ensure flatness control in 0.008mm, verticality
Control is in 0.005mm；
Armature spindle large cylindrical surface amounts to 144 threaded holes with chamfering, and traditional handicraft is：First centre drill pre-determined bit, fiber crops
Flower bores pre- hole, chamfer drill processing chamfering, and fluted drill bores thread Pilot hole, last tapping, tedious process, inefficiency, and pole
It is error-prone.On this basis, technology is processed and formed at one time using NEW TYPE OF COMPOSITE brill, pre-determined bit bores chamfering, bores one step of thread Pilot hole
It completes.Traditional handicraft, which processes each screw hole, need to take 15 minutes, can be controlled in 2 minutes and complete after improvement, and efficiency improves, and hole
Position position degree is accurate.
It is to be understood that：Although above-described embodiment contrasts to the mentality of designing of the present invention, detailed word is retouched
It states, but these word descriptions, only the simple text of mentality of designing of the present invention is described rather than to mentality of designing of the present invention
Limitation, any combination, increase or modification without departing from mentality of designing of the present invention each fallen in protection scope of the present invention.
Claims (2)
1. a kind of high-voltage motor highly stressed rotor axis processing method, it is characterized in that：
(1) armature spindle material production quality percentage：
C 0.30-0.36%, Si0.17-0.37%, Mn0.25-0.50%, P and S≤0.020%, Cr1.30-1.60%,
Mo0.20-0.35%, Ni1.30-1.60%, V0.04-0.10%；
(2) heat treatment after forging and quenched：
A. heat treatment after forging：After forging process for fuel, first stand and be air-cooled in the annealing furnace to be expected that forging surface is 650 DEG C,
650 DEG C keep the temperature 6 hours, then the stress generated when being forged with eliminating is cooled to 300 DEG C, and 300 to be less than the cooling rate of 35 DEG C/h
DEG C heat preservation 6 hours, the austenite structure of forging is made fully to change；Added after 300 DEG C of heat preservations with being not more than the speed of 80 DEG C/h
Heat keeps the temperature 8 hours to 880 DEG C, is furnace-cooled to after making inside workpiece complete austenitizing with being not more than the cooling velocity of 35 DEG C/h
300 DEG C and keep the temperature 6 hours, austenite structure is made fully to be changed into ferrite and pearlite；Again to be not more than the speed of 80 DEG C/h
It is heated to 650 DEG C and keeps the temperature 15 hours, carry out tempering and expand hydrogen processing, be finally furnace-cooled to being not more than the cooling velocity of 30 DEG C/h
Less than 100 DEG C come out of the stove it is air-cooled；
B. modifier treatment：Heat stepwise guarantee is heated evenly, on the basis of the first heat treatment stabilizing tissue, using water quenching oil
Cold technique first carries out 250 DEG C of x6h heat preservations, to obtain martensitic structure as much as possible before tempering；650 DEG C of guarantors during Quench heating
Warm 5h is that workpiece deformation is caused even to crack when heating in order to prevent since workpiece internal-external temperature difference is excessive, and water cooling 40 is used during quenching
Minute oil cooling 140 minutes again, 250 DEG C of heat preservations after quenching：
(3) armature spindle is processed：
A. bearing guard circularity requires to control in 0.006mm, lathe in machining, and center rest support idler wheel tooling is improved to
The plane bracket watt of babbit material, friction mode are changed to sliding friction by rolling friction；After process is transferred to grinding machine fine grinding, when
After mill amount is milled to 0.3mm, ageing treatment after 1 week is stood, dimensioned is in place as required；
B. highest bearing guard region is required in axis, i.e. flatness 0.012mm, verticality is relative to bearing rib 0.012mm, bearing shell
When surface roughness is below 0.63, using the integrally joint processing of plane, end face, is controlled using grinding wheel registration, use Buddha's warrior attendant
Plane of grinding wheel is trimmed to the fritter contact surface of back taper by stone sand flywheel knife, is ground bearing shell plane with feeding mode in processing, is ensured
Flatness is controlled in 0.008mm, and degree control is in 0.005mm；
C. armature spindle large cylindrical surface amounts to 144 threaded holes with chamfering, and technology is processed and formed at one time using composite drill, makes a reservation for
Position bores chamfering, bores the completion of one step of thread Pilot hole.
2. high-voltage motor according to claim 1 highly stressed rotor forging shaft, it is characterized in that：Yield strength Re >=
600MPa；800~900MPa of tensile strength Rm；Elongation percentage A >=16.0%；Contraction percentage of area Z >=55.0%；Notched bar impact strength
AKv≥32J(20℃)。
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| CN112122893A (en) * | 2020-01-10 | 2020-12-25 | 宝鼎科技股份有限公司 | Finish machining method for electric bounce rotor shaft |
| CN114193094A (en) * | 2021-12-08 | 2022-03-18 | 江苏特贝尔精密机械科技有限公司 | Machining process of ultrahigh precision main shaft |
| CN114990316A (en) * | 2022-06-20 | 2022-09-02 | 重庆长征重工有限责任公司 | Heat treatment method for main shaft of wind generating set |
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| CN114990316A (en) * | 2022-06-20 | 2022-09-02 | 重庆长征重工有限责任公司 | Heat treatment method for main shaft of wind generating set |
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