US20140255238A1 - Rotor of vane pump and method of manufacturing rotor - Google Patents

Rotor of vane pump and method of manufacturing rotor Download PDF

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Publication number
US20140255238A1
US20140255238A1 US14/200,541 US201414200541A US2014255238A1 US 20140255238 A1 US20140255238 A1 US 20140255238A1 US 201414200541 A US201414200541 A US 201414200541A US 2014255238 A1 US2014255238 A1 US 2014255238A1
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United States
Prior art keywords
approximately
rotor
iron
product
molten metal
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Abandoned
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US14/200,541
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English (en)
Inventor
Jaebong PARK
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LG Electronics Inc
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LG Electronics Inc
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Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PARK, Jaebong
Publication of US20140255238A1 publication Critical patent/US20140255238A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D25/00—Special casting characterised by the nature of the product
    • B22D25/06—Special casting characterised by the nature of the product by its physical properties
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/04—Cast-iron alloys containing spheroidal graphite
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons
    • 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
    • F04C2230/20—Manufacture essentially without removing material
    • F04C2230/21—Manufacture essentially without removing material by casting
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0436—Iron
    • F05C2201/0439—Cast iron

Definitions

  • a rotor of a vane pump and a method of manufacturing a rotor are disclosed herein.
  • a power steering pump to supply oil pressure may be used.
  • Various types of pumps may be utilized as a power steering pump, and in general, a vane pump having high efficiency, small volume, and weight, and generating less vibrations is utilized.
  • FIG. 1 is a schematic cross-sectional view of a related art vane pump.
  • the vane pump may include a body 1 and a pump cartridge 3 installed in the body 1 .
  • the pump cartridge 3 may include a rotor 31 rotatably installed within the body 1 , and a cam ring 30 , in which the rotor 31 may be installed.
  • a plurality of slots may be formed in the rotor 31 , and a vane 32 may be slidably installed within each of the plurality of slots.
  • the vane 32 may be pressurized toward an inner wall of the cam ring 30 , thus preventing leakage between an end portion of the vane 32 and an inner wall surface of the cam ring 30 .
  • the rotor 31 may be coupled to a rotational shaft 50 rotated by a driving force from an engine, so that the rotor 31 may be rotated together with a driving of the engine.
  • the vane 32 may also be rotated together to force-feed a fluid within a space defined by outer surfaces of the vane 32 , cam ring 30 , and rotor 31 .
  • cam rings have been manufactured through a heat treatment, such as carburizing and quenching, for example, by using low-alloy steel, such as 20CrMo, Cr12MoV, for example.
  • a heat treatment such as carburizing and quenching
  • low-alloy steel such as 20CrMo, Cr12MoV
  • this manufacturing method involves complicated processing, and as bar-shaped continuous casting should be severed and processed, large amounts of material may be consumed and a process time lengthened.
  • a carburizing and quenching treatment consumes a large amount of raw material. Further, after quenching, dimensions of a component may be significantly changed, making it difficult to manufacture a cam ring.
  • FIG. 1 is a schematic cross-sectional view of a related art vane pump
  • FIG. 2 is a photograph illustrating structure of a rotor according to an embodiment.
  • a vane pump according to an embodiment will be described in detail with reference to the accompanying drawings.
  • the embodiments are directed to a material of a rotor included in a vane pump, rather than being related to a configuration thereof, and thus, embodiments are not limited by a configuration of a rotor.
  • the vane pump will be described based on the configuration illustrated in FIG. 1 .
  • cast iron has high hardness and excellent abrasion resistance and machinability, but has low tensile strength and strong brittleness, so cast iron is rarely used as a material of a member exposed to a high pressure atmosphere.
  • the rotor of a vane pump as mentioned above slides upon being tightly attached with a lateral surface portion of the vane, and thus, the rotor is required to have high abrasion resistance, relative to the related art.
  • nodular graphite cast iron having an austenite structure obtained by precipitating spheroidal graphite may be utilized as a material of the rotor.
  • the content of pig iron is approximately 20 ⁇ 70% by weight ratio. Or, the content of pig iron may be approximately 30 ⁇ 60%. Or, the content of pig iron may be approximately 40 ⁇ 50%.
  • Pig iron a type of iron immediately produced from iron ore, may contain impurities, such as sulfur, and phosphor, for example, besides approximately 2.2% to 7% (approximately 2.5% to 4.5% in most cases) of carbon (C). Due to brittleness, pig iron may not be rolled or forged. However, as pig iron has a low melting point, pig iron may be appropriate to be utilized as a raw material of casting.
  • scraps namely, fragments, for example, produced while steel is machined has characteristics identical to those of the base material.
  • steel wastes remaining after steel is utilized in construction sites or various structures and ends its life retain ductility and toughness of the original steel.
  • steel wastes may be mixed with pig iron during a casing process to improve characteristics of the pig iron.
  • the content of iron (Fe) may be approximately 0.1 ⁇ 0.4% by weight ratio. Or, the content of iron may be approximately 0.15 ⁇ 0.35%. Or, the content of iron may be approximately 0.25 ⁇ 0.35%.
  • copper (Cu) may be added in an amount of approximately 0.2% to 0.5%.
  • Copper (Cu) is an element thickening and shortening graphite in shape, reducing D and E type undercooled graphite, and accelerating A type flake graphite.
  • copper (Cu) may positively serve to improve a shape of graphite and hamper graphitizing and reduce a chilled tendency of cast iron during a eutectoiding process.
  • copper (Cu) may improve a carbide distribution, form pearlites, and subdivide the structure.
  • copper (Cu) may subdivide pearlites by reducing a distance between pearlites, while acceleration formation of pearlites.
  • copper (Cu) fluidity of molten metal may enhance castability and lower residual stress.
  • copper (Cu) may densify the structure and enhance tensile strength and hardness of cast iron more or less.
  • Copper (Cu) may be added in an amount of approximately 0.2 ⁇ 0.5% by weight ratio. Or, the content of copper may be approximately 0.3 ⁇ 0.5% by weight ratio. Or, the content of copper may be approximately 0.3 ⁇ 0.4% by weight ratio.
  • the foregoing pig iron, scraps, steel wastes, copper, and iron (Fe) may be selected in appropriate ratios to prepare a raw material, and the raw material may be put into a middle frequency induction furnace and heated to be melted, and subsequently smelted. At this time, the crude liquid molten metal may be taken out at a temperature ranging from approximately 1500° C. to 1550° C.
  • a nodularizer to nodularize graphite and an inoculant may be inoculated to the crude liquid molten metal smelted in the smelting process.
  • magnesium (Mg), calcium (Ca), and rare earth resources (RE), known to accelerate nodularization of graphite may be used as the nodularizer.
  • a nodularizer having components such as Mg: approximately 5.5-6.5%, Si: approximately 44-48%, Ca: approixmately 0.5-2.5%, AL ⁇ approximately 1.5%, RE: approximately 0.8-1.5%, MgO ⁇ approximately 0.7% may be used.
  • FeSiMg6RE1 may be added in an amount of approximately 1.0 ⁇ 1.2% of a mass of the crude liquid molten metal.
  • inoculation generates a large amount of graphite nucleus to accelerate graphitizing, and makes a distribution of graphite uniform, and helps to increase strength.
  • a barium silicon iron alloy FeSi72Ba2
  • the content of inoculant may be approximately 0.4 ⁇ 0.8% of the mass of the crude liquid molten metal.
  • the inoculated molten metal may be injected into a mold manufactured in advance to have a cavity having a desired shape. Casting may be performed using a green sand mold, and a temperature of the molten metal during the injection process may be controlled to range from approximately 1380 ⁇ 1420° C. Stream inoculation may be performed simultaneously when the molten metal is injected into the mold, and here, an injection may be a sulfur oxygen injection, and the content may be approximately 0.05 ⁇ 0.2% of the mass of the crude liquid molten metal. The molten metal injected into the mold may be cooled to obtain a nodular cast iron rotor.
  • the rotor semi-product obtained in the casting process may be first cleaned to remove sand and an oxide layer attached to a surface thereof, and machined to have an intended shape.
  • Isothermal hardening may be performed on the machined rotor semi-product.
  • the isothermal hardening may be performed to austenitize the matrix structure.
  • the machined rotor semi-product having a pearlite matrix structure may be heated by using an electrical resistance furnace capable of controlling an air temperature to reach approximately 890 ⁇ 950° C., maintained for approximately 60 ⁇ 90 minutes, and put into a nitrate solution having a temperature ranging from approximately 280 ⁇ 340° C., maintained for approximately 1 ⁇ 3 hours, taken out, and cooled to reach approximately room temperature in the air.
  • an electrical resistance furnace capable of controlling an air temperature to reach approximately 890 ⁇ 950° C., maintained for approximately 60 ⁇ 90 minutes, and put into a nitrate solution having a temperature ranging from approximately 280 ⁇ 340° C., maintained for approximately 1 ⁇ 3 hours, taken out, and cooled to reach approximately room temperature in the air.
  • a pearlite matrix of the rotor semi-product may be transformed into an au
  • a solution in which KNO 3 and NaNO 3 are mixed in a weight ratio of approximately 1:1 may be used as the nitrate solution.
  • Concentration of the nitrate solution and concentration of KNO 3 and NaNO 3 constituting the nitrate solution are not particularly limited.
  • the nitrate solution, as a quenching medium, is advantageous, compared with general quenching oil. Advantages of the nitrate solution are as follows.
  • the rotor of the nodular graphite cast iron of carbide obtained through the heat treatment may be fine-ground and polished to have a final shape and required surface quality.
  • the crude liquid molten metal of nodular graphite cast iron taken out of the furnace was spheroidized and inoculated, and rare earth resource silicon iron magnesium alloy (FeSiMg6RE1) was added as a nodularizer in an amount of approximately 1.0% of the mass of the crude liquid molten metal, and barium silicon iron (FeSi72Ba2) was added as an inoculant in an amount of approximately 0.5% of the mass of the crude liquid molten metal
  • the spheroidized and inoculated molten metal were injected into a green sand mold manufactured in advance. After a temperature thereof was controlled to approximately 1390° C., the molten metal was cooled to obtain a nodular cast iron rotor containing spheroidal graphite, ferrite, and pearlite.
  • the nodular cast iron rotor was processed to have a rotor shape, heated to reach approximately 900° C. by using a furnace capable of continuously heating, maintained for approximately 60 minutes, and quickly put into a nitrate solution having a temperature of approximately 300° C. for approximately two hours. Thereafter, the nodular cast iron rotor was taken out and cooled to reach approximately room temperature to obtain austenite nodular graphite cast iron rotor.
  • the rotor semi-product was heated to reach approximately 920° C., maintained for approximately 70 minutes, and put into a nitrate solution having a temperature of approximately 290° C. for approximately two hours. Thereafter, the rotor semi-product was cooled to reach approximately room temperature and fine-ground and polished.
  • the rotor semi-product was heated to reach approximately 915° C., maintained for approximately 70 minutes, and put into a nitrate solution having a temperature of approximately 290° C. for two hours. Thereafter, the rotor semi-product was cooled to reach approximately room temperature and fine-ground and polished.
  • the rotor semi-product was heated to reach approximately 905° C., maintained for approximately 90 minutes, and put into a nitrate solution having a temperature of approximately 320° C. for approximately two hours. Thereafter, the rotor semi-product was cooled to reach approximately room temperature and fine-ground and polished.
  • FIG. 2 is a photograph illustrating internal structure of Embodiment 1. Referring to FIG. 2 , it can be seen that Embodiment 1 is comprised of austenite and spheroidal graphite.
  • Embodiments disclosed herein provide a rotor of a vane pump having excellent abrasion resistance and impact resistance and easily manufactured. Embodiments disclosed herein further provide a method for manufacturing a rotor of a vane pump. Embodiments disclosed herein provide a rotor of a vane pump, that may include a plurality of radially formed slots and having a disk shape, being formed of a material including approximately 20% to 70% of pig iron, approximately 0.2% to 0.5% of copper (Cu), and approximately 0.1% to 0.4% of iron (Fe) by weight ratio, and scraps and steel wastes for the remainder, and formed of a nodular graphite cast iron including precipitated spheroidal graphite and having an austenite structure.
  • a rotor of a vane pump may include a plurality of radially formed slots and having a disk shape, being formed of a material including approximately 20% to 70% of pig iron, approximately 0.2% to 0.5% of copper (Cu), and approximately 0.1% to 0.4% of iron
  • Scraps refer to fragments, for example, produced during mechanical working, and steel waste refers to steel discarded after being used.
  • the rotor of a vane pump may be formed of the nodular graphite cast iron to have sufficient strength and abrasion resistance, and as scraps and steel wastes may be used, manufacturing costs may be reduced.
  • the weight ratio of the steel wastes may be equal to or smaller than that of the scraps, and more specifically, a weight ratio between the scraps and the steel wastes may be approximately 1:1 to 5:1 by weight ratio.
  • Embodiments disclosed herein provide a method for manufacturing a rotor of a vane pump that may include mixing raw materials including approximately 20% to 70% of pig iron, approximately 0.2% to 0.5% of copper (Cu), and approximately 0.1% to 0.4% of iron (Fe), and scraps and steel wastes for the remainder and smelting the crude liquid molten metal; applying a nodularizer and an inoculant to the smelted crude liquid molten metal; a casting operation of injecting the molten metal into a mold to obtain a rotor semi-product; machining the rotor semi-product to have a predetermined shape; and isothermal-hardening the machined rotor semi-product.
  • the crude liquid molten metal may be taken out at a temperature ranging from approximately 1500° C. to 1550° C.
  • a silicon-iron-magnesium alloy (FeSiMg6RE1), a rare earth element, may be applied as the nodularizer in an amount of approximately 1.0% to 1.2% of a mass of the crude liquid molten metal.
  • the isothermal-hardening may include heating the rotor semi-product to reach a temperature ranging from approximately 890° C. to 950° C. and maintaining the heated rotor semi-product for approximately 60 minutes to 90 minutes; applying the rotor semi-product to a liquid having a temperature ranging from approximately 280° C. to 340° C. and maintaining the rotor semi-product in the liquid for approximately one to three hours; and cooling the rotor semi-product to reach approximately room temperature in the atmosphere.
  • the liquid may be a nitrate solution obtained by mixing KNO 3 and NaNO 3 in a ratio of approximately 1:1.
  • the method may further include grinding the hardening-completed rotor semi-product to have a final shape.
  • nodular graphite cast iron including precipitated spheroidal graphite and having an austenite structure may be used.
  • the austenite structure has high impact resistance and abrasion resistance, and due to work hardening, surface hardness may be further enhanced during a production process.
  • abrasion resistance may be further enhanced.
  • scraps or steel wastes may be used, without using a rare earth element or a high-priced material, manufacturing costs may be considerably reduced.
  • any reference in this specification to “one embodiment,” “an embodiment,” “example embodiment,” etc. means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention.
  • the appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Rotary Pumps (AREA)
US14/200,541 2013-03-08 2014-03-07 Rotor of vane pump and method of manufacturing rotor Abandoned US20140255238A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2013-0025242 2013-03-08
KR1020130025242A KR102105458B1 (ko) 2013-03-08 2013-03-08 베인 펌프용 로터 및 그 제조방법

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KR (1) KR102105458B1 (ko)
CN (1) CN104032204A (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112387978A (zh) * 2020-10-21 2021-02-23 西安斯瑞先进铜合金科技有限公司 一种刹车片用CuFe合金粉末的制备方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109182663A (zh) * 2018-08-14 2019-01-11 浙江钜丰冲压科技有限公司 一种耐磨损转子的制备方法

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Publication number Priority date Publication date Assignee Title
US4619713A (en) 1983-02-25 1986-10-28 Hitachi Metals, Ltd. Method of producing nodular graphite cast iron
JPH06322475A (ja) * 1993-05-13 1994-11-22 Hitachi Metals Ltd 排気系部品及びその製造方法
JP5012231B2 (ja) 2007-06-08 2012-08-29 Ｊｆｅスチール株式会社 耐摩耗性に優れた高強度球状黒鉛鋳鉄品
KR101020174B1 (ko) 2010-08-11 2011-03-07 (주) 동방주물 내식성이 뛰어난 오스테나이트 구상흑연주철
CN102069695A (zh) * 2011-01-26 2011-05-25 西峡县金鑫特种铸钢有限公司 奥氏体球墨铸铁后板簧支架的铸造方法
CN102218504A (zh) * 2011-05-18 2011-10-19 大连新重集团有限公司 一种砂型铸造等温淬火球墨铸铁载重汽车前轴的制造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112387978A (zh) * 2020-10-21 2021-02-23 西安斯瑞先进铜合金科技有限公司 一种刹车片用CuFe合金粉末的制备方法

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KR102105458B1 (ko) 2020-04-28
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