CN112743079A - Double-clutch transmission mechanical oil pump stator and preparation method thereof - Google Patents

Double-clutch transmission mechanical oil pump stator and preparation method thereof Download PDF

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Publication number
CN112743079A
CN112743079A CN201911048984.XA CN201911048984A CN112743079A CN 112743079 A CN112743079 A CN 112743079A CN 201911048984 A CN201911048984 A CN 201911048984A CN 112743079 A CN112743079 A CN 112743079A
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stator
percent
double
oil pump
mechanical oil
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施昌旭
夏敏
石小荣
戴定中
刘桦
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Jiangsu Zhizao New Material Co ltd
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Jiangsu Zhizao New Material Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/1003—Use of special medium during sintering, e.g. sintering aid
    • B22F3/1007—Atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/11—Making porous workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F3/26—Impregnating
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
    • F16H57/0436—Pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/247—Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/248—Thermal after-treatment

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Abstract

The invention provides a mechanical oil pump stator of a double-clutch transmission, which comprises the following components in percentage by mass: cr: 1.7 to 1.9 percent; ni: 1.9-2.1%; c: 0.54 to 0.66 percent; special lubricant: 0.4% -0.5%; the balance being Fe and unavoidable impurities. The invention also provides a preparation method of the mechanical oil pump stator of the double-clutch transmission, which comprises the following steps: mixing materials; warm die pressing; sintering, hardening and tempering; coarse grinding and fine grinding of the double end faces; grinding a central inner hole curve; carrying out planar wet brushing and deburring; ultrasonic cleaning and inspecting; vacuum oil immersion and telecentric separation; and (6) packaging. The stator prepared according to the components meets the technical requirements of the double-clutch gearbox mechanical oil pump on assembly, use precision, strength and the like, and fills the blank of the high-precision, high-strength and high-wear-resistance powder metallurgy mechanical oil pump stator. The preparation method adopts the combination of warm die pressing and sintering hardening processes and the matching of a new material and the processes of double-end-face coarse grinding, fine grinding and high-precision inner hole curve grinding to produce the mechanical oil pump stator of the double-clutch transmission with high performance, high precision and low cost.

Description

Double-clutch transmission mechanical oil pump stator and preparation method thereof
Technical Field
The invention mainly relates to the technical field of powder metallurgy automobile parts, in particular to a mechanical oil pump stator of a double-clutch transmission and a powder metallurgy preparation method thereof.
Background
Along with the continuous development and improvement of automobile technology, the comfort requirement of drivers and passengers on automobiles is higher and higher, and the gear shifting comfort directly influences the comfort requirement of the whole automobile for a gearbox. The double-clutch automatic transmission is not provided with a hydraulic torque converter of a traditional automatic transmission, is one of mechanical automatic transmissions and is provided with two power output shafts, one power output shaft is connected with one clutch, one power output shaft controls 1, 3, 5 and 7 gears, the other power output shaft controls 2, 4 and 6 reverse gears, and in the whole gear shifting process, when one group of gears outputs power, the other group of gears is ready to always keep one group of gears outputting power, so that the interruption of power transmission can not occur, the gear shifting process is faster, and the speed is increased more rapidly. Because the double-clutch automatic gearbox has no power interruption in the torque transmission process, the gear shifting comfort is improved, the fuel consumption of an automobile is greatly reduced, and the double-clutch automatic gearbox represents the development direction of the automatic gearbox.
The mechanical oil pump is driven by a gear directly connected with the double clutches, and has the main functions of providing automatic gearbox lubricating oil for the two clutches, providing automatic gearbox lubricating oil for cooling the clutches, providing automatic gearbox lubricating oil for a hydraulic switching system and providing automatic gearbox lubricating oil for lubricating a gear pair and a shaft. The mechanical oil pump is mainly composed of a stator, a rotor, blades and the like, when the mechanical oil pump works, the blades cling to the inner surface of the stator under the action of centrifugal force and root pressure oil to generate sliding and rolling compound motion, and the stator is required to have higher hardness, wear resistance and machining precision. The stator is a high-precision and high-strength core part of the mechanical oil pump of the double-clutch transmission.
The traditional mechanical oil pump stator is finished by adopting a billet through a machining process, the machining process needs about 20 working procedures, and the mechanical oil pump stator is low in material utilization rate, low in production efficiency and high in cost. Meanwhile, the inner surface of the stator produced by the traditional billet machine has poor rolling pressure resistance and high noise, and the inner hole surface of the stator is extremely easy to be roughened when the blades rotate at high speed, so that the performance and the service life of the mechanical oil pump are influenced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the production of the mechanical oil pump stator of the double-clutch transmission not only has the functions of high hardness, abrasion resistance, self lubrication, low noise and high precision, meets the use requirement, but also can greatly improve the production efficiency and reduce the production cost
In order to solve the technical problems, the invention is realized by the following technical scheme:
the mechanical oil pump stator of the double-clutch transmission is characterized in that the stator components are configured according to the mass percentage: cr: 1.7 to 1.9 percent; ni: 1.9-2.1%; c: 0.54 to 0.66 percent; special lubricant: 0.4% -0.5%; the balance being Fe and unavoidable impurities.
Furthermore, the stator comprises a stator base body, wherein the center of the stator base body is provided with an inner hole with a special-shaped curved surface, and the peripheral edge of the stator base body is respectively provided with a waist-shaped oil outlet hole, a flat positioning pin hole and a circular positioning pin hole.
The invention also provides a preparation method of the mechanical oil pump stator of the double-clutch transmission, which comprises the following steps:
the method comprises the following steps: designing raw material composition and mixing: mixing the materials according to the mass percentage of the components;
step two: warm die pressing: putting the prepared powder metallurgy raw material into a forming machine, putting a cylindrical heating rod and a thermocouple into a female die, and heating the die to 93 +/-5 ℃;
step three: sintering, hardening and tempering: placing the formed green body into a high-temperature continuous sintering furnace, sintering in an oxygen-free environment, then carrying out air cooling quenching at a cooling speed of 2.5-5 ℃/S to obtain a sintered stator, and tempering the sintered hardened stator in air at 180 +/-5 ℃ for 60min to recover stress;
step four: coarse grinding and fine grinding of the double end faces;
step five: grinding a central inner hole curve;
step six: carrying out planar wet brushing and deburring;
step seven: ultrasonic cleaning and inspecting;
step eight: vacuum oil immersion and telecentric separation;
step nine: and (6) packaging.
Furthermore, in the second step, the forming density of the whole green body obtained by warm die pressing after forming and before sintering is more than or equal to 7.2g/cm3, the joints of all parts of the green body have no cracks, and burrs are automatically brushed after the green body is demoulded.
Further, in the third step, the high-temperature continuous sintering furnace adopts a mesh-belt type sintering hardening furnace, the sintering temperature is 1120 ℃ +/-10 ℃, the sintering atmosphere is N2: H2 which is 90: 10, and the sintering time is 30-45 min; the oxygen-free environment adopts hydrogen H2As protective gas, the air cooling adopts nitrogen N2As a cooling medium.
Preferably, the powder metallurgy comprises the following components in percentage by mass: cr: 1.7 percent; ni: 2.1 percent; c: 0.54%, special lubricant: 0.4 percent; the balance being Fe and unavoidable impurities.
Preferably, the powder metallurgy comprises the following components in percentage by mass: cr: 1.9 percent; ni: 1.9 percent; c: 0.66 percent; special lubricant: 0.5 percent; the balance being Fe and unavoidable impurities.
Preferably, the powder metallurgy comprises the following components in percentage by mass: cr: 1.8 percent; ni: 2.0 percent; c: 0.60 percent; special lubricant: 0.45 percent; the balance being Fe and unavoidable impurities.
The invention has the beneficial effects that:
according to the double-clutch transmission mechanical oil pump stator, various parameters meet the technical requirements of assembling, using precision, strength and the like of the double-clutch transmission mechanical oil pump, and the blank of the high-precision, high-strength and high-wear-resistance powder metallurgy mechanical oil pump stator is filled. The invention discloses a preparation method of a mechanical oil pump stator of a double-clutch transmission, which comprises the following steps: the mechanical oil pump stator of the double-clutch transmission with high performance, high precision and low cost is produced by combining warm die pressing and sintering hardening processes and matching with a new material and a double-end-face coarse grinding, fine grinding and high-precision inner hole curve grinding process.
(1) The self-lubricating function of the powder metallurgy pores enhances the wear resistance of the oil pump stator. Because the powder metallurgy product matrix has certain pores, the vacuum oil immersion and the telecentric separation enable the stator to be subjected to oil infiltration treatment under vacuum negative pressure, and lubricating oil can quickly, uniformly and thoroughly penetrate into each fine pore and gap of the powder metallurgy stator and has a smooth surface. When the mechanical oil pump works, the temperature of the inner hole wall of the stator is raised due to the friction between the blades and the inner hole of the stator, the lubricating oil seeps out of the inner diameter of the stator, and a continuous oil film is formed on the inner surface of the stator; when the blades stop rotating, the stator is cooled, the pores recover, and the lubricating oil is sucked back to the pores, so that the self-lubricating function is realized.
(2) The method is characterized in that pure nickel with unstable price and high price is replaced by chromium with stable price, a small amount of pre-alloyed powder of nickel or molybdenum is added as a sintering hardening raw material, and a special lubricant 0 is selected.4 to 0.5 percent, and the product is molded by warm die to have the density of more than or equal to 7.2g/cm3The cost of the material is reduced by more than 20 percent under the same condition compared with the commonly used D32 material (the components of which are, by mass, 0.5 to 0.8 percent of C, 1.5 to 2.5 percent of Cu, 3.5 to 4.5 percent of Ni, 1.2 to 1.6 percent of Mo, the balance of Fe and the balance of impurities of less than 2 percent). The mechanical property of the product is achieved by adopting one-step production operation of a sintering hardening process, the deformation of the product is small, the subsequent improvement of hardness and strength through heat treatment is avoided, the influence of the heat treatment deformation on the verticality of the positioning hole by 0.017mm is avoided, the requirement of correcting the position degree through shaping is avoided, the production cost is greatly reduced, and the quality stability of the product is improved.
(3) The mechanical oil pump stator with high performance, high precision and low cost is produced by a high-precision plane grinding and special-shaped curve grinding process, and a warm die pressing and sintering hardening process is adopted, so that the heat treatment is omitted, the product deformation is reduced, and the product precision and the quality stability are improved. On the premise of ensuring the mechanical performance, the wear resistance of the stator and the service life of the mechanical oil pump of the double-clutch transmission are greatly improved.
Drawings
FIG. 1 is a front view of an inner hub of a hybrid transmission clutch for an automobile in accordance with the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
wherein: 1. a stator base; 2. an inner hole of the special-shaped curved surface; 3. a kidney-shaped oil outlet; 4. a flat positioning pin hole; 5. and a circular positioning pin hole.
Detailed Description
The preferred mechanisms and methods of motion realization of the present invention are further described below in conjunction with the figures and the detailed description.
As shown in fig. 1 and 2, the double-clutch transmission mechanical oil pump stator comprises a stator base body 1, wherein the center of the stator base body 1 is provided with a special-shaped curved surface inner hole 2, and the peripheral edge of the stator base body 1 is respectively provided with 2 kidney-shaped oil outlet holes 3, 1 flat positioning pin hole 4 and 1 circular positioning pin hole 5.
The stator base body center dysmorphism curved surface hole 2, the blade of the mechanical oil pump pastes the surface motion of stator and forms the volume change of oil, the mechanical oil pump is pumped, discharged oil mainly leans on this curved surface; the two kidney-shaped oil outlet holes 3 are used for guiding oil at the front cover of the mechanical oil pump to an oil outlet so as to reduce the internal flow rate of the stator; a flat positioning pin hole 4 and a round positioning pin hole 5 for installation.
The stator of the mechanical oil pump of the double-clutch transmission is a powder metallurgy product, and the powder metallurgy comprises the following components in percentage by mass: 1.7 to 1.9 percent; ni: 1.9-2.1%; c: 0.54 to 0.66 percent; 0.4 to 0.5 percent of special lubricant; the balance being Fe and unavoidable impurities.
Cr adopted by the invention is a cheap alloying element, is environment-friendly, and can endow steel with excellent hardenability. Therefore, it is widely used as an alloying element for structural steels. Although the advantages are significant, in the powder metallurgy industry, sintering atmospheres with very low oxygen partial pressures are required due to the high affinity of Cr and oxygen. The uniformity of the chemical composition and the microstructure of the Cr alloy steel can obtain the highest mechanical use performance by selecting proper sintering process conditions and selecting accurate Cr content and cooling rate, and the formed uniform microstructure is easily positioned between the whole bainite and the whole martensite by selecting proper production process conditions. The present invention replaces expensive and unstable pure nickel and molybdenum with inexpensive and stable Cr, and only a small amount of nickel powder is added during the production of the pre-alloyed material. And a special lubricant is matched, so that the pressing performance of the raw materials can be improved, and the pressing density of a formed product is improved.
A powder metallurgy preparation method for a stator of a mechanical oil pump of a double-clutch transmission comprises the following steps:
(1) mixing materials: designing raw material composition and mixing: mixing the materials according to the mass percentage of the components;
(2) warm die pressing: putting the prepared powder metallurgy raw material into a forming machine, putting a cylindrical heating rod and a thermocouple into a female die, and heating the die to 93 +/-5 ℃;
(3) sintering, hardening and tempering: placing the formed green body into a high-temperature continuous sintering furnace, sintering in an oxygen-free environment, then carrying out air cooling quenching at a cooling speed of 2.5-5 ℃/S to obtain a sintered stator, and tempering the sintered hardened stator in air at 180 +/-5 ℃ for 60min to recover stress;
(4) coarse grinding and fine grinding of double end faces: the stator is subjected to double-end-face coarse grinding and double-end-face fine grinding in sequence, so that the requirements on height, parallelism, flatness, roughness and the like are met;
(5) grinding a central inner hole curve: carrying out inner curve grinding on the special-shaped center hole of the stator to ensure the requirements of roughness, profile tolerance and the like;
(6) carrying out plane wet brushing and deburring: carrying out plane wet brush deburring on the stator;
(7) vacuum oil immersion and telecentric separation: by adopting the vacuum oil immersion and telecentric separation process, the stator is subjected to oil infiltration treatment under vacuum negative pressure, and the lubricating oil can quickly, uniformly and thoroughly infiltrate into each fine pore and gap of the powder metallurgy stator and has a smooth surface;
(8) ultrasonic cleaning and inspecting;
(9) and (6) packaging.
The overall density of the mechanical oil pump stator of the double-clutch transmission prepared by the preparation method reaches 7.2g/cm3(ii) a Surface hardness 300HV 5; height 10.30 +0.004mm, the parallelism of the end face is 0.004mm, and the planeness is 0.005 mm; irregular curved surface inner hole 2: the roughness is Ra0.2mm, and the profile tolerance is 0.04 mm; the positioning round hole phi 4 +/-0.015 mm and the positioning flat hole 4 +/-0.015 mm are arranged, and the verticality of the two holes to the large plane is 0.017 mm.
The preparation method adopts vacuum oil immersion and telecentric separation process. Because the powder metallurgy product matrix has certain pores, the stator is subjected to oil infiltration treatment under vacuum negative pressure, and the lubricating oil can quickly, uniformly and completely infiltrate into each fine pore and each gap of the powder metallurgy stator and has a smooth surface. When the mechanical oil pump works, the temperature of the inner hole wall of the stator is raised due to the friction between the blades and the inner hole of the stator, the lubricating oil seeps out of the inner diameter of the stator, and a continuous oil film is formed on the inner surface of the stator; when the machine stops rotating, the stator is cooled, the pore recovers, and the lubricating oil is sucked back to the pore, so that the self-lubricating function is realized.
Example 1
A preparation method of a mechanical oil pump stator of a double-clutch transmission comprises the following steps:
(1) mixing materials: designing raw material composition and mixing materials, and uniformly mixing the following raw materials in percentage by mass: cr: 1.7 percent; ni: 2.1 percent; c: 0.54 percent; 0.4 percent of special lubricant; the balance being Fe and unavoidable impurities.
(2) Warm die pressing: putting the prepared powder metallurgy raw material into a forming machine, putting a cylindrical heating rod and a thermocouple into a female die, heating the die to 93 +/-5 ℃, and forming the powder metallurgy raw material with the forming density of 7.25g/cm3And the joint of each part of the green body has no crack. And automatically brushing burrs after demolding the green body.
(3) Sintering and hardening, wherein a mesh belt type sintering and hardening furnace is adopted for sintering, the sintering temperature is 1120 ℃, and the temperature is N2∶H2Sintering for 40min in a sintering atmosphere of 90: 10, and adopting hydrogen H in an oxygen-free environment2As a shielding gas. Specifically, the air cooling adopts nitrogen N2As a cooling medium, the cooling rate was about 3.5 ℃/S and the hardness was 350HV 5.
(4) Tempering: the sinter hardened stator was tempered in air at 180 ℃. + -. 5 ℃ for 60min to recover the stress.
(5) Grinding: the height of 10.3 is ensured by coarse grinding and fine grinding of the double end faces0 +0.004mm, the parallelism of the end face is 0.004mm, and the planeness is 0.005 mm; the central hole is processed by an inner curve mill, so that the profile tolerance is ensured to be 0.04mm, and the roughness is ensured to be Ra0.2mm.
(6) And (5) deburring by using a planar wet brush.
(7) And (4) ultrasonic cleaning.
(8) Vacuum oil immersion and telecentric separation: the stator is subjected to oil infiltration treatment under vacuum negative pressure, and the lubricating oil can quickly, uniformly and thoroughly infiltrate into each fine pore and gap of the powder metallurgy stator and has a smooth surface.
(9) And (7) inspecting, packaging and warehousing.
Example 2
A preparation method of a mechanical oil pump stator of a double-clutch transmission comprises the following steps:
(1) mixing materials: designing raw material composition and mixing materials, and uniformly mixing the following raw materials in percentage by mass: cr: 1.9 percent; ni: 1.9 percent; c: 0.66 percent; 0.5 percent of special lubricant; the balance being Fe and unavoidable impurities.
(2) Warm die pressing: putting the prepared powder metallurgy raw material into a forming machine, putting a cylindrical heating rod and a thermocouple into a female die, heating the die to 93 +/-5 ℃, and forming the powder metallurgy raw material with the forming density of 7.30g/cm3And the joint of each part of the green body has no crack. And automatically brushing burrs after demolding the green body.
(3) Sintering and hardening, wherein a mesh belt type sintering and hardening furnace is adopted for sintering, the sintering temperature is 1110 ℃, and the sintering temperature is N2∶H2Sintering for 40min in a sintering atmosphere of 90: 10, and adopting hydrogen H in an oxygen-free environment2As a shielding gas. Specifically, the air cooling adopts nitrogen N2As a cooling medium, the cooling rate was about 2.5 ℃/S, and the hardness was 363HV 5.
(4) Tempering: the sinter hardened stator was tempered in air at 180 ℃. + -. 5 ℃ for 60min to recover the stress.
(5) Grinding: the height of 10.3 is ensured by coarse grinding and fine grinding of the double end faces0 +0.004mm, the parallelism of the end face is 0.004mm, and the planeness is 0.005 mm; the central hole is processed by an inner curve mill, so that the profile tolerance is ensured to be 0.04mm, and the roughness is ensured to be Ra0.2mm.
(6) And (5) deburring by using a planar wet brush.
(7) And (4) ultrasonic cleaning.
(8) Vacuum oil immersion and telecentric separation: the stator is subjected to oil infiltration treatment under vacuum negative pressure, and the lubricating oil can quickly, uniformly and thoroughly infiltrate into each fine pore and gap of the powder metallurgy stator and has a smooth surface.
(9) And (7) inspecting, packaging and warehousing.
Example 3
A preparation method of a mechanical oil pump stator of a double-clutch transmission comprises the following steps:
(1) mixing materials: designing raw material composition and mixing materials, and uniformly mixing the following raw materials in percentage by mass: cr: 1.8 percent; ni: 2.0 percent; c: 0.60 percent; 0.45 percent of special lubricant; the balance being Fe and unavoidable impurities.
(2) Warm die pressing: putting the prepared powder metallurgy raw material into a forming machine, putting a cylindrical heating rod and a thermocouple into a female die, heating the die to 93 +/-5 ℃, and forming the powder metallurgy raw material with the forming density of 7.20g/cm3And the joint of each part of the green body has no crack. And automatically brushing burrs after demolding the green body.
(3) Sintering and hardening, wherein a mesh belt type sintering and hardening furnace is adopted for sintering, the sintering temperature is 1130 ℃, and the sintering temperature is N2∶H2Sintering for 40min in a sintering atmosphere of 90: 10, and adopting hydrogen H in an oxygen-free environment2As a shielding gas. Specifically, the air cooling adopts nitrogen N2As a cooling medium, the cooling rate was about 3.0 ℃/S. Hardness 357HV 5.
(4) Tempering: tempering the sintered and hardened stator in air at 180 +/-5 ℃ for 60min to recover the stress;
(5) grinding: the height of 10.3 is ensured by coarse grinding and fine grinding of the double end faces0 +0.004mm, the parallelism of the end face is 0.004mm, and the planeness is 0.005 mm; the central hole is processed by an inner curve mill, so that the profile tolerance is ensured to be 0.04mm, and the roughness is ensured to be Ra0.2mm.
(6) And (5) deburring by using a planar wet brush.
(7) And (4) ultrasonic cleaning.
(8) Vacuum oil immersion and telecentric separation: the stator is subjected to oil infiltration treatment under vacuum negative pressure, and the lubricating oil can quickly, uniformly and thoroughly infiltrate into each fine pore and gap of the powder metallurgy stator and has a smooth surface.
(9) And (7) inspecting, packaging and warehousing.
Finally, it should be noted that: although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (8)

1. The mechanical oil pump stator of the double-clutch transmission is characterized in that the stator components are configured according to the mass percentage: cr:
1.7 to 1.9 percent; ni: 1.9-2.1%; c: 0.54 to 0.66 percent; special lubricant: 0.4% -0.5%; the balance being Fe and unavoidable impurities.
2. The stator of the mechanical oil pump of the double-clutch gearbox as claimed in claim 1, wherein the stator comprises a stator base body, the center of the stator base body is provided with a special-shaped curved surface inner hole, and the peripheral edge of the stator base body is respectively provided with a kidney-shaped oil outlet hole, a flat positioning pin hole and a circular positioning pin hole.
3. A method for preparing a stator of a mechanical oil pump of a dual clutch transmission according to claim 1 or 2, characterized by comprising the following steps:
the method comprises the following steps: designing raw material composition and mixing: mixing the materials according to the mass percentage of the components;
step two: warm die pressing: putting the prepared powder metallurgy raw material into a forming machine, putting a cylindrical heating rod and a thermocouple into a female die, and heating the die to 93 +/-5 ℃;
step three: sintering, hardening and tempering: placing the formed green body into a high-temperature continuous sintering furnace, sintering in an oxygen-free environment, then carrying out air cooling quenching at a cooling speed of 2.5-5 ℃/S to obtain a sintered stator, and tempering the sintered hardened stator in air at 180 +/-5 ℃ for 60min to recover stress;
step four: coarse grinding and fine grinding of the double end faces;
step five: grinding a central inner hole curve;
step six: carrying out planar wet brushing and deburring;
step seven: ultrasonic cleaning and inspection
Step eight: vacuum oil immersion and telecentric separation
Step nine: and (6) packaging.
4. A dual clutch transmission mechanical oil pump stator as claimed in claim 3The preparation method is characterized in that in the second step, the forming density of the whole green compact obtained by warm die pressing after forming and before sintering is more than or equal to 7.2g/cm3And the joints of all parts of the green body have no cracks, and burrs are automatically brushed after the green body is demoulded.
5. The method for preparing the stator of the mechanical oil pump of the double-clutch transmission gear box according to the claim 4, wherein in the third step, the high-temperature continuous sintering furnace adopts a mesh belt type sintering hardening furnace, the sintering temperature is 1120 ℃ +/-10 ℃, and the sintering atmosphere is N2∶H2The ratio of the raw materials to the raw materials is 90: 10, and the sintering time is 30-45 min; the oxygen-free environment adopts hydrogen H2As protective gas, the air cooling adopts nitrogen N2As a cooling medium.
6. The preparation method of the stator of the mechanical oil pump of the double-clutch gearbox according to claim 5, wherein the mass percentages of the powder metallurgy components are as follows: cr: 1.7 percent; ni: 2.1 percent; c: 0.54%, special lubricant: 0.4 percent; the balance being Fe and unavoidable impurities.
7. The preparation method of the stator of the mechanical oil pump of the double-clutch gearbox according to claim 6, wherein the mass percentages of the powder metallurgy components are as follows: cr: 1.9 percent; ni: 1.9 percent; c: 0.66 percent; special lubricant: 0.5 percent; the balance being Fe and unavoidable impurities.
8. The preparation method of the stator of the mechanical oil pump of the double-clutch gearbox according to claim 6, wherein the mass percentages of the powder metallurgy components are as follows: cr: 1.8 percent; ni: 2.0 percent; c: 0.60 percent; special lubricant: 0.45 percent; the balance being Fe and unavoidable impurities.
CN201911048984.XA 2019-10-30 2019-10-30 Double-clutch transmission mechanical oil pump stator and preparation method thereof Pending CN112743079A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1297389A (en) * 1999-04-16 2001-05-30 日商优尼希雅杰克斯股份有限公司 Metallic powder molding material and its re-compression molded body and sintered body obtained from re-compression molded body and production methods thereof
CN102000825A (en) * 2009-09-02 2011-04-06 东睦新材料集团股份有限公司 Method for manufacturing driving gear of motorcycle clutch
JP2015187307A (en) * 2015-05-25 2015-10-29 株式会社ダイヤメット Sintered bearing for motor type fuel pump excellent in corrosion resistance, wear resistance and fitness
CN105234405A (en) * 2015-10-14 2016-01-13 东睦新材料集团股份有限公司 Preparation method for iron-based powder metallurgy part with compact surface
CN207750230U (en) * 2017-12-06 2018-08-21 江苏智造新材有限公司 A kind of motor turning blade pump stator
CN109702207A (en) * 2018-12-28 2019-05-03 江苏智造新材有限公司 Engine blade formula becomes displacement oil pump rotor and its method for preparing powder metallurgy
CN109852897A (en) * 2018-12-28 2019-06-07 江苏智造新材有限公司 A kind of method for preparing powder metallurgy of double clutch large torque automatic gear-box synchromesh gear hubs
CN109869311A (en) * 2017-12-05 2019-06-11 江苏智造新材有限公司 A kind of motor turning blade pump stator and preparation method thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1297389A (en) * 1999-04-16 2001-05-30 日商优尼希雅杰克斯股份有限公司 Metallic powder molding material and its re-compression molded body and sintered body obtained from re-compression molded body and production methods thereof
CN102000825A (en) * 2009-09-02 2011-04-06 东睦新材料集团股份有限公司 Method for manufacturing driving gear of motorcycle clutch
JP2015187307A (en) * 2015-05-25 2015-10-29 株式会社ダイヤメット Sintered bearing for motor type fuel pump excellent in corrosion resistance, wear resistance and fitness
CN105234405A (en) * 2015-10-14 2016-01-13 东睦新材料集团股份有限公司 Preparation method for iron-based powder metallurgy part with compact surface
CN109869311A (en) * 2017-12-05 2019-06-11 江苏智造新材有限公司 A kind of motor turning blade pump stator and preparation method thereof
CN207750230U (en) * 2017-12-06 2018-08-21 江苏智造新材有限公司 A kind of motor turning blade pump stator
CN109702207A (en) * 2018-12-28 2019-05-03 江苏智造新材有限公司 Engine blade formula becomes displacement oil pump rotor and its method for preparing powder metallurgy
CN109852897A (en) * 2018-12-28 2019-06-07 江苏智造新材有限公司 A kind of method for preparing powder metallurgy of double clutch large torque automatic gear-box synchromesh gear hubs

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Application publication date: 20210504