CN104454525B - Preparation method of high-nodularity nodular cast iron rotor of central air-conditioner screw compressor - Google Patents

Preparation method of high-nodularity nodular cast iron rotor of central air-conditioner screw compressor Download PDF

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CN104454525B
CN104454525B CN201410764876.3A CN201410764876A CN104454525B CN 104454525 B CN104454525 B CN 104454525B CN 201410764876 A CN201410764876 A CN 201410764876A CN 104454525 B CN104454525 B CN 104454525B
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rotor
iron
stove
preparation
spheroidal graphite
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CN104454525A (en
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王振生
杨双双
彭真
宋力
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Hunan University of Science and Technology
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Hunan University of Science and Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F04C18/165—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type having more than two rotary pistons with parallel axes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/10—Making spheroidal graphite cast-iron
    • 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
    • C21D5/00—Heat treatments of cast-iron
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/082—Details specially related to intermeshing engagement type pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/40—Heat treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/20—Rotors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

The invention discloses a preparation method of a high-nodularity nodular cast iron rotor of a central air-conditioner screw compressor. The preparation method comprises the following steps: (1) preparing materials; (2) smelting; (3) nodulizing and breeding; (4) casting; (5) annealing; (6) heating and keeping the temperature; (7) austenitizing; (8) normalizing; and (9) tempering. The preparation method disclosed by the invention is simple in process and easy to implement; a nodular cast iron rotor material prepared by the preparation method is larger than 600MPa in minimum tensile strength, larger than 370MPa in minimum yield strength, higher than 4% in minimum elongation rate and 180HB to 270HB in Brinell hardness; the hardness difference of any rotor is not larger than 30HB; the nodular cast iron rotor is good in various mechanical properties, can satisfy the requirements of machining, is free from deformation after being machined and is suitable for preparing a compressor rotor of a wet type screw compressor of a central air conditioner.

Description

The preparation method of the central air-conditioning helical-lobe compressor spheroidal graphite cast-iron rotor of high Oxygen potential
Technical field
The present invention relates to a kind of preparation method of spheroidal graphite cast-iron rotor, particularly to a kind of central air-conditioning wet type screw compression The preparation method of the spheroidal graphite cast-iron rotor of the high Oxygen potential of machine.
Background technology
The wet screw compressor of central air-conditioning is made up of a pair of parallel, intermeshing yin, yang screw rod.Spray in working chamber Enter lubricating oil or other liquid thereby to cool down by compressed gas, improve sealing, and Castor Oil yin, yang rotor and bearing, realize certainly Body is driven, then is removed and obtain higher quality the oil in compressed air or other liquid impurity by high-precision filter Compressed gas.Wet screw compressor has structure simply it is easy to safeguard, reliable and stable, also commonly uses in air force engineering.
In wet screw compressor, it is crucial that a pair intermeshing rotor, the flank of tooth of rotor and rotor axis hang down Face directly section line is referred to as molded lines of rotor.Molded lines of rotor has significant impact to the performance of compressor, such as UNITED OSD forth generation type Line improves nearly 5% than third generation molded line efficiency, and the measurement index of molded lines of rotor is mainly contact line, reveals triangle, closing Volume, between cog area.
At present, the medium carbon steel of widely used forging or medium carbon low alloy steel prepare rotor.However, there is preparation in forged steel rotor Complex process, stock utilization are low, the shortcoming of high cost, and after processing the flank of tooth changeableness of rotor and make yin, yang two rotor Collide in rotation process, noise and vibration occur.
How to prepare inexpensive, indeformable, low noise, high damping energy rotor, the key becoming helical-lobe compressor is asked Topic.Spheroidal graphite cast-iron has the excellent mechanical performances being equal to medium carbon steel or medium carbon low alloy steel phase, spherical due to existing in tissue Graphite, in rotor operation process, graphite absorbs lubricating oil or other liquid, when rotor lubrication is bad, can separate out lubrication Oily or other liquid, play the effect of anti-dry friction, and graphite can also play the effect of antifriction as natural kollag. In addition, the organizational structure that graphite is constituted with ferrum can be with absorbing.Thus, central air-conditioning wet type screw compression is prepared using spheroidal graphite cast-iron The rotor of machine has feasibility.
Content of the invention
In order to solve above-mentioned technical problem, the present invention provides a kind of central air-conditioning screw rod pressure of the high Oxygen potential of process is simple The preparation method of contracting machine spheroidal graphite cast-iron rotor, using the spheroidal graphite cast-iron rotor each side good mechanical properties of this method preparation, energy Meet the needs of machining, and indeformable after machining.
The technical scheme that the present invention solves the above problems is：A kind of central air-conditioning helical-lobe compressor spheroidal graphite casting of high Oxygen potential The preparation method of ferrum rotor, comprises the following steps：
1) dispensing：Weigh following component by percentage to the quality：The pig iron 55～60%, foundry return 10～15%, steel scrap 23～26%, ferromanganese 0.50～0.60%；99% bronze medal 0.20～0.40%, nodulizer 1.2～1.5%, silicon iron inoculator 1.00 ～1.50%, long-acting rare earth inovulant 0.90～1.10%；
2) smelt：The above-mentioned pig iron, foundry return, steel scrap are first put into fusing in stove, molten iron temperature reaches 1420～1450 DEG C Put into ferromanganese afterwards, ferromanganese adds perlite slag making 2 times after putting into 2～3 minutes, scratches clean slag, control molten iron temperature be 1380～ 1420 DEG C of molten iron dischargings, the cast iron melting time is less than 2 hours；
3) nodularization+breed：The long-acting rare earth inovulant of nodulizer+75# silicon iron inoculator+0.4～0.6% is placed in ladle bottom Portion side, and prevent molten iron from directly washing away with sheet metal covering, the molten iron injection come out of the stove does not have the ladle bottom one of inovulant Side, copper is also placed in ladle bottom with molten iron fusing of coming out of the stove, and whole water outlet, process time controlled within 5 minutes；
4) pour into a mould：Poured into a mould within 90 seconds with 0.5% long-acting rare earth inovulant current-following inoculation, time control during casting molten iron Finish, casting covers rising head to slow down foundry goods rate of cooling with combustion adjuvant after finishing；Rotor Shake-out Time is not less than 12 hours；
5) anneal：The rotor casting being poured is put into annealing furnace, is warming up to 550～600 DEG C, insulation 0.5～1 is little When, programming rate is 20～40 DEG C/min, then is warming up to 860～900 DEG C, is incubated 3～4 hours, and programming rate is 10～20 DEG C/min, cool to 100～150 DEG C with the furnace and come out of the stove；
6) rotor casting after processing is put into the frock that bottom is plane, be then placed in heating furnace, heat up with stove, rise Warm 20～40 DEG C/min of speed, is warming up to 550 DEG C～600 DEG C, is incubated 0.5～1 hour；
7) austenitizing：Heating in-furnace temperature is warming up to 860 DEG C～900 DEG C from 550 DEG C～600 DEG C, and programming rate is 10 ～20 DEG C/min, it is incubated 2～4 hours；
8) normalizing：Rotor is come out of the stove, and is cooled to room temperature in atmosphere；
9) it is tempered：After normalizing, spheroidal graphite cast-iron rotor is immediately placed in well formula tempering furnace and is tempered 3～6 hours, temperature 500～550 DEG C, it is tempered 1 time.
In the preparation method of central air-conditioning helical-lobe compressor spheroidal graphite cast-iron rotor of above-mentioned high Oxygen potential, described step 1) In, the pig iron is the new pig iron of Q10, and ferromanganese is 65# ferromanganese, and silicon iron inoculator is 75# silicon iron inoculator.
In the preparation method of central air-conditioning helical-lobe compressor spheroidal graphite cast-iron rotor of above-mentioned high Oxygen potential, described step 4) in Poured into a mould using bottom gating, rotor casting is upright, rising head adopts A type rising head.
The beneficial effects of the present invention is：The preparation method process is simple of the present invention, it is easily achieved, using this preparation method The spheroidal graphite cast-iron rotor matrix of preparation is organized as：Pearlite >=50%, remaining is ferrite, iron phosphide eutectic+cementite≤2%, its Section nodulizing grade is better than 3 grades, spheroidal graphite cast-iron internal rotor flawless, shrinkage cavity, cold shut, sand holes, slag blister, shrinkage porosite, shrinkage cavity, cast The defects such as deficiency；Radial ultrasonic wave inspection can meet spheroidal graphite cast-iron rotor arbitrary section defective area and be not more than 20cm2Will Ask；Minimum tensile strength σ of spheroidal graphite cast-iron rotor materialbBetter than 600MPa, SMYS σ0.2Better than 370MPa, minimum Elongation percentage δ5Better than 4%, Brinell hardness 180～270HB, the difference of hardness of either rotor is not more than 30HB；This spheroidal graphite cast-iron rotor Each side good mechanical properties, can meet the needs of machining, and machine after indeformable it is adaptable to prepare central hollow damping The compressor drum of formula helical-lobe compressor.
Specific embodiment
With reference to embodiment, the present invention is further illustrated.
Embodiment 1：
The present embodiment module is large-scale spheroidal graphite cast-iron rotor, 216 millimeters of maximum gauge, 131 kilograms of finished weight.
1) dispensing：Weigh following component by percentage to the quality：The new pig iron of Q10 55%, foundry return 15%, steel scrap 26%, 65# ferromanganese 0.50%；99% bronze medal 0.20%, nodulizer 1.20%, 75# silicon iron inoculator 1.00%, long-acting rare earth breeds Agent 1.10%.
2) smelt：The above-mentioned pig iron, foundry return, steel scrap are first put into fusing in stove, molten iron temperature reaches 1420 DEG C of input manganese Ferrum, ferromanganese adds perlite slag making 2 times after putting into 2 minutes, scratches clean slag, and control molten iron temperature is 1380 DEG C of molten iron dischargings, and molten iron melts The refining time is less than 2 hours.
3) nodularization+breed：The long-acting rare earth inovulant of nodulizer+75# silicon iron inoculator+0.6% is placed in ladle bottom one Side, and prevent molten iron from directly washing away with sheet metal covering, the molten iron injection come out of the stove does not have the ladle bottom side of inovulant, copper It is also placed in ladle bottom with molten iron fusing of coming out of the stove, whole water outlet, process time controlled within 5 minutes.
4) pour into a mould：Using bottom gating, rotor casting is upright, and rising head adopts A type rising head；During casting molten iron 0.5% long-acting rare earth inovulant current-following inoculation, time control was poured within 90 seconds, and casting is covered with combustion adjuvant after finishing Rising head is to slow down foundry goods rate of cooling；Rotor Shake-out Time is not less than 12 hours.
5) anneal：The rotor casting being poured is put into annealing furnace, is warming up to 600 DEG C, be incubated 1 hour, programming rate For 20 DEG C/min, then it is warming up to 900 DEG C, is incubated 4 hours, programming rate is 10 DEG C/min, cools to 100 DEG C with the furnace and comes out of the stove.
6) rotor casting after processing is put into the frock that bottom is plane, be then placed in heating furnace, heat up with stove, rise Warm 20 DEG C/min of speed, is warming up to 600 DEG C, is incubated 1 hour.
7) austenitizing：Heating in-furnace temperature rises to 900 DEG C from 600 DEG C, and programming rate is 10 DEG C/min, is incubated 4 hours.
8) normalizing：Rotor is come out of the stove, and is cooled to room temperature in atmosphere.
9) it is tempered：After normalizing, spheroidal graphite cast-iron rotor is immediately placed in well formula tempering furnace and is tempered 6 hours, temperature 500 DEG C, it is tempered 1 time.
It is better than 3 grades through the whole spheroidal graphite cast-iron rotor section nodulizing grade of above-mentioned process, spheroidal graphite cast-iron internal rotor is no The defects such as crackle, shrinkage cavity, cold shut, sand holes, slag blister, shrinkage porosite, shrinkage cavity, underpriming.Radial ultrasonic wave inspection can meet spheroidal graphite casting Ferrum rotor arbitrary section defective area is not more than 20cm2Requirement.The tensile strength sigma of spheroidal graphite cast-iron rotor materialbFor 621MPa, SMYS σ0.2For 392MPa, elongation percentage δ5For 4.5%, Brinell hardness 235～258HB, either rotor Difference of hardness is not more than 30HB.Spheroidal graphite cast-iron rotor matrix is organized as：Pearlite >=50%, remaining is ferrite, iron phosphide eutectic+carburizing Body≤2%.
Embodiment 2
The present embodiment module is medium-sized spheroidal graphite cast-iron rotor, 181 millimeters of maximum gauge, 78 kilograms of finished weight.
1) dispensing：Weigh following component by percentage to the quality：The new pig iron of Q10 60%, foundry return 10%, steel scrap 25%, 65# ferromanganese 0.60%；99% bronze medal 0.40%, nodulizer 1.5%, 75# silicon iron inoculator 1.5%, long-acting rare earth inovulant 1.0%.
2) smelt：The above-mentioned pig iron, foundry return, steel scrap are first put into fusing in stove, molten iron temperature reaches 1450 DEG C of input manganese Ferrum, ferromanganese adds perlite slag making 2 times after putting into 3 minutes, scratches clean slag, and control molten iron temperature is 1420 DEG C of molten iron dischargings, and molten iron melts The refining time is less than 2 hours.
3) nodularization+breed：The long-acting rare earth inovulant of nodulizer+75# silicon iron inoculator+0.5% is placed in ladle bottom one Side, and prevent molten iron from directly washing away with sheet metal covering, the molten iron injection come out of the stove does not have the ladle bottom side of inovulant, copper It is also placed in ladle bottom with molten iron fusing of coming out of the stove, whole water outlet, process time controlled within 5 minutes.
4) pour into a mould：Using bottom gating, rotor casting is upright, and rising head adopts A type rising head；During casting molten iron 0.5% long-acting rare earth inovulant current-following inoculation, time control was poured within 90 seconds, and casting is covered with combustion adjuvant after finishing Rising head is to slow down foundry goods rate of cooling；Rotor Shake-out Time is not less than 12 hours.
5) anneal：The rotor casting being poured is put into annealing furnace, is warming up to 580 DEG C, be incubated 0.5 hour, heat up speed Spend for 30 DEG C/min, then be warming up to 880 DEG C, be incubated 3.5 hours, programming rate is 15 DEG C/min, cools to 120 DEG C with the furnace and goes out Stove.
6) rotor after processing is put into the frock that bottom is plane, be then placed in heating furnace, heat up with stove, heat up speed 30 DEG C/min of degree, is warming up to 580 DEG C, is incubated 0.75 hour.
7) austenitizing：Heating in-furnace temperature rises to 880 DEG C from 580 DEG C, and programming rate is 15 DEG C/min, is incubated 3 hours.
8) normalizing：Rotor is come out of the stove, and is cooled to room temperature in atmosphere.
9) it is tempered：After normalizing, spheroidal graphite cast-iron rotor is immediately placed in well formula tempering furnace and is tempered 5 hours, temperature 520 DEG C, it is tempered 1 time.
It is better than 3 grades through the whole spheroidal graphite cast-iron rotor section nodulizing grade of above-mentioned process, spheroidal graphite cast-iron internal rotor is no The defects such as crackle, shrinkage cavity, cold shut, sand holes, slag blister, shrinkage porosite, shrinkage cavity, underpriming.Radial ultrasonic wave inspection can meet spheroidal graphite casting Ferrum rotor arbitrary section defective area is not more than 20cm2Requirement.The tensile strength sigma of spheroidal graphite cast-iron rotor materialbFor 638MPa, SMYS σ0.2For 407MPa, elongation percentage δ5For 5.2%, Brinell hardness 232～259HB, either rotor Difference of hardness is not more than 30HB.Spheroidal graphite cast-iron rotor matrix is organized as：Pearlite >=50%, remaining is ferrite, iron phosphide eutectic+carburizing Body≤2%.
Embodiment 3
The present embodiment module is small-sized spheroidal graphite cast-iron rotor, 120 millimeters of maximum gauge, 48 kilograms of finished weight.
1) dispensing：Weigh following component by percentage to the quality：The new pig iron of Q10 58.5%, foundry return 14%, steel scrap 23%, 65# ferromanganese 0.55%；99% bronze medal 0.30%, nodulizer 1.45%, 75# silicon iron inoculator 1.3%, long-acting rare earth breeds Agent 0.9%.
2) smelt：The above-mentioned pig iron, foundry return, steel scrap are first put into fusing in stove, molten iron temperature reaches 1440 DEG C of input manganese Ferrum, ferromanganese adds perlite slag making 2 times after putting into 2.5 minutes, scratches clean slag, and control molten iron temperature is 1400 DEG C of molten iron dischargings, molten iron Smelting time is less than 2 hours.
3) nodularization+breed：The long-acting rare earth inovulant of nodulizer+75# silicon iron inoculator+0.4% is placed in ladle bottom one Side, and prevent molten iron from directly washing away with sheet metal covering, the molten iron injection come out of the stove does not have the ladle bottom side of inovulant, copper It is also placed in ladle bottom with molten iron fusing of coming out of the stove, whole water outlet, process time controlled within 5 minutes.
4) pour into a mould：Using bottom gating, rotor casting is upright, and rising head adopts A type rising head；During casting molten iron 0.5% long-acting rare earth inovulant current-following inoculation, time control was poured within 90 seconds, and casting is covered with combustion adjuvant after finishing Rising head is to slow down foundry goods rate of cooling；Rotor Shake-out Time is not less than 12 hours.
5) anneal：The rotor casting being poured is put into annealing furnace, is warming up to 550 DEG C, be incubated 0.75 hour, heat up speed Spend for 40 DEG C/min, then be warming up to 860 DEG C, be incubated 3 hours, programming rate is 20 DEG C/min, cools to 150 DEG C with the furnace and goes out Stove.
6) rotor after processing is put into the frock that bottom is plane, be then placed in heating furnace, heat up with stove, heat up speed 40 DEG C/min of degree, is warming up to 550 DEG C, is incubated 0.5 hour.
7) austenitizing：Heating in-furnace temperature rises to 860 DEG C from 550 DEG C, and programming rate is 20 DEG C/min, is incubated 2 hours.
8) normalizing：Rotor is come out of the stove, and is cooled to room temperature in atmosphere.
9) it is tempered：After normalizing, spheroidal graphite cast-iron rotor is immediately placed in well formula tempering furnace and is tempered 3 hours, temperature 550 DEG C, it is tempered 1 time.
It is better than 3 grades through the whole spheroidal graphite cast-iron rotor section nodulizing grade of above-mentioned process, spheroidal graphite cast-iron internal rotor is no The defects such as crackle, shrinkage cavity, cold shut, sand holes, slag blister, shrinkage porosite, shrinkage cavity, underpriming.Radial ultrasonic wave inspection can meet spheroidal graphite casting Ferrum rotor arbitrary section defective area is not more than 20cm2Requirement.The tensile strength sigma of spheroidal graphite cast-iron rotor materialbFor 642MPa, SMYS σ0.2For 415MPa, elongation percentage δ5For 5.6%, Brinell hardness 239～256HB, either rotor Difference of hardness is not more than 30HB.Spheroidal graphite cast-iron rotor matrix is organized as：Pearlite >=50%, remaining is ferrite, iron phosphide eutectic+carburizing Body≤2%.

Claims (3)

1. a kind of preparation method of the central air-conditioning helical-lobe compressor spheroidal graphite cast-iron rotor of high Oxygen potential, comprises the following steps：
1）Dispensing：Weigh following component by percentage to the quality：The pig iron 55 ~ 60 %, foundry return 10 ~ 15 %, steel scrap 23 ~ 26 %, ferromanganese 0.50 ~ 0.60 %；99 % copper 0.20 ~ 0.40 %, nodulizer 1.2 ~ 1.5 %, silicon iron inoculator 1.00 ~ 1.50%, long-acting rare earth inovulant 0.90 ~ 1.10%；
2) smelt：The above-mentioned pig iron, foundry return, steel scrap are first put into fusing in stove, molten iron temperature puts into after reaching 1420 ~ 1450 DEG C Ferromanganese, ferromanganese adds perlite slag making 2 times after putting into 2 ~ 3 minutes, scratches clean slag, controls molten iron temperature to tap a blast furnace for 1380 ~ 1420 DEG C Water, the cast iron melting time is less than 2 hours；
3）Nodularization+breed：The long-acting rare earth inovulant of nodulizer+75# silicon iron inoculator+0.4 ~ 0.6% is placed in ladle bottom one Side, and prevent molten iron from directly washing away with sheet metal covering, the molten iron injection come out of the stove does not have the ladle bottom side of inovulant, copper It is also placed in ladle bottom with molten iron fusing of coming out of the stove, whole water outlet, process time controlled within 5 minutes；
4）Cast：It is poured within 90 seconds with 0.5% long-acting rare earth inovulant current-following inoculation, time control during casting molten iron, Casting covers rising head to slow down foundry goods rate of cooling with combustion adjuvant after finishing；Rotor Shake-out Time is not less than 12 hours；
5）Annealing：The rotor casting being poured is put into annealing furnace, is warming up to 550 ~ 600 DEG C, be incubated 0.5 ~ 1 hour, heat up Speed is 20 ~ 40 DEG C/min, then is warming up to 860 ~ 900 DEG C, is incubated 3 ~ 4 hours, and programming rate is 10 ~ 20 DEG C/min, with stove It is cooled to 100 ~ 150 DEG C to come out of the stove；
6）Rotor casting after processing is put into the frock that bottom is plane, is then placed in heating furnace, heat up with stove, heat up speed 20 ~ 40 DEG C/min of degree, is warming up to 550 DEG C ~ 600 DEG C, is incubated 0.5 ~ 1 hour；
7）Austenitizing：Heating in-furnace temperature be warming up to 860 DEG C ~ 900 DEG C from 550 DEG C ~ 600 DEG C, programming rate be 10 ~ 20 DEG C/ Min, is incubated 2 ~ 4 hours；
8）Normalizing：Rotor is come out of the stove, and is cooled to room temperature in atmosphere；
9）Tempering：After normalizing, spheroidal graphite cast-iron rotor is immediately placed in well formula tempering furnace and is tempered 3 ~ 6 hours, temperature 500 ~ 550 DEG C, it is tempered 1 time.
2. the preparation method of the central air-conditioning helical-lobe compressor spheroidal graphite cast-iron rotor of high Oxygen potential as claimed in claim 1, its It is characterised by：Described step 1）In, the pig iron is the new pig iron of Q10, and ferromanganese is 65# ferromanganese, and silicon iron inoculator breeds for 75# ferrosilicon Agent.
3. the preparation method of the central air-conditioning helical-lobe compressor spheroidal graphite cast-iron rotor of high Oxygen potential as claimed in claim 1, its It is characterised by：Described step 4）Middle poured into a mould using bottom gating, rotor casting is upright, and rising head adopts A type rising head.
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