CN112522632A - Powder metallurgy wear-resistant stator and production process thereof - Google Patents

Powder metallurgy wear-resistant stator and production process thereof Download PDF

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Publication number
CN112522632A
CN112522632A CN202011427250.5A CN202011427250A CN112522632A CN 112522632 A CN112522632 A CN 112522632A CN 202011427250 A CN202011427250 A CN 202011427250A CN 112522632 A CN112522632 A CN 112522632A
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China
Prior art keywords
percent
stator
production process
wear
powder metallurgy
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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CN202011427250.5A
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Chinese (zh)
Inventor
霍东成
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzhou Netshape Composite Materials Co Ltd
Original Assignee
Suzhou Netshape Composite Materials Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Priority to CN202011427250.5A priority Critical patent/CN112522632A/en
Publication of CN112522632A publication Critical patent/CN112522632A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • 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
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • 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
    • F04C2230/22—Manufacture essentially without removing material by sintering
    • 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

Abstract

The invention discloses a powder metallurgy wear-resistant stator and a production process thereof, wherein the stator is prepared from the following raw materials in percentage by mass: 1.83 to 2.18 percent of Ni, 0.76 to 0.97 percent of Mo, 0.61 to 0.86 percent of C and the balance of Fe. The stator produced by the production process can meet the requirements of commercial vehicles on high wear resistance and high strength of the steering pump stator; the production process saves the production cost, improves the material utilization rate, reduces the product weight and meets the requirement of light weight development of automobiles; the stator has high bending strength and wear resistance. Therefore, the powder metallurgy wear-resistant stator prepared by the production process has higher performance.

Description

Powder metallurgy wear-resistant stator and production process thereof
Technical Field
The invention belongs to the technical field of powder metallurgy, and particularly relates to a powder metallurgy wear-resistant stator and a production process thereof.
Background
The steering pump stators of the existing powder metallurgy mass production process are all steering pump stators of passenger cars with relatively lower requirements, and the steering pump stators of commercial cars with higher requirements on working conditions and harsher environment are all produced by a forging process; however, the wear resistance and strength of the commercial vehicle steering pump stator produced by the existing powder metallurgy process cannot meet the use requirements.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a powder metallurgy wear-resistant stator and a production process thereof, and by adopting the powder metallurgy process, the production cost of the existing steering pump stator of a commercial vehicle is reduced; meanwhile, the material utilization rate is improved, the product weight is reduced, and the development requirement of light weight of the automobile is met.
In order to achieve the purpose, the invention provides the following technical scheme:
the powder metallurgy wear-resistant stator is prepared from the following raw materials in percentage by mass: 1.83 to 2.18 percent of Ni, 0.76 to 0.97 percent of Mo, 0.61 to 0.86 percent of C and the balance of Fe.
Further, the powder metallurgy wear-resistant stator is prepared from the following raw materials in percentage by mass: 1.85 to 2.12 percent of Ni, 0.78 to 0.93 percent of Mo, 0.67 to 0.83 percent of C and the balance of Fe.
The production process of the wear-resistant stator comprises the following steps:
(1) shaping of
Heating the middle mold for mold warming, pressing the raw material powder prepared according to the requirement into a green body with certain strength under the pressure of 600-800 MPa;
(2) sintering
Sintering the formed green body into a part with the strength of 400-600MPa by using a mesh-belt type sintering furnace;
(3) thermal treatment
Carburizing and austenitizing at 850-860 ℃, quenching by using quenching oil, and finally tempering to improve the strength of the part to over 1000 MPa;
(4) immersion oil
Immersing the whole part in anti-rust oil for 5min to form an oil film on the surface of the product, thereby achieving the anti-rust effect;
(5) package (I)
And packaging according to production requirements to prevent collision damage caused in the transportation process.
Further, the heating temperature of the middle mold in the step (1) is 70 ℃.
Further, the maximum sintering temperature of the step (2) is 1121 ℃.
Has the advantages that: the invention provides a powder metallurgy wear-resistant stator and a production process thereof, and compared with the prior art, the powder metallurgy wear-resistant stator has the following advantages:
1. the stator produced by the production process can meet the requirements of commercial vehicles on high wear resistance and high strength of the steering pump stator;
2. compared with the traditional forging process, the stator produced by adopting the production process saves the cost by about 30 percent, improves the material utilization rate, reduces the product weight and meets the requirement of light weight development of automobiles;
3. the stator produced by the production process has the bending strength of more than or equal to 1800MPa, is not broken after 100 ten thousand times of impact tests under 16MPa, and has the wear resistance test wear loss of less than 0.02mm in 415 hours.
Therefore, the powder metallurgy wear-resistant stator prepared by the production process has higher performance.
Detailed Description
The present invention is further described below with reference to specific examples, which are only exemplary and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
Example 1
The powder metallurgy wear-resistant stator is prepared from the following raw materials in percentage by mass: 1.83% of Ni, 0.76% of Mo, 0.61% of C and the balance of Fe.
The production process of the wear-resistant stator comprises the following steps:
(1) shaping of
Heating the middle die to 70 ℃, pressing the raw material powder prepared according to the requirement into a green body with certain strength under the pressure of 600-800 MPa;
(2) sintering
Sintering by using a mesh belt type sintering furnace, wherein the highest sintering temperature is 1121 ℃, and sintering the formed green body into a part with the strength of 400-;
(3) thermal treatment
Carburizing and austenitizing at 850-860 ℃, quenching by using quenching oil, and finally tempering to improve the strength of the part to over 1000 MPa;
(4) immersion oil
Immersing the whole part in anti-rust oil for 5min to form an oil film on the surface of the product, thereby achieving the anti-rust effect;
(5) package (I)
And packaging according to production requirements to prevent collision damage caused in the transportation process.
Example 2
The powder metallurgy wear-resistant stator is prepared from the following raw materials in percentage by mass: 1.95% of Ni, 0.82% of Mo, 0.69% of C and the balance of Fe.
The production process of the wear-resistant stator comprises the following steps:
(1) shaping of
Heating the middle die to 70 ℃, pressing the raw material powder prepared according to the requirement into a green body with certain strength under the pressure of 600-800 MPa;
(2) sintering
Sintering by using a mesh belt type sintering furnace, wherein the highest sintering temperature is 1121 ℃, and sintering the formed green body into a part with the strength of 400-;
(3) thermal treatment
Carburizing and austenitizing at 850-860 ℃, quenching by using quenching oil, and finally tempering to improve the strength of the part to over 1000 MPa;
(4) immersion oil
Immersing the whole part in anti-rust oil for 5min to form an oil film on the surface of the product, thereby achieving the anti-rust effect;
(5) package (I)
And packaging according to production requirements to prevent collision damage caused in the transportation process.
Example 3
The powder metallurgy wear-resistant stator is prepared from the following raw materials in percentage by mass: 2.01% of Ni, 0.88% of Mo, 0.78% of C and the balance of Fe.
The production process of the wear-resistant stator comprises the following steps:
(1) shaping of
Heating the middle die to 70 ℃, pressing the raw material powder prepared according to the requirement into a green body with certain strength under the pressure of 600-800 MPa;
(2) sintering
Sintering by using a mesh belt type sintering furnace, wherein the highest sintering temperature is 1121 ℃, and sintering the formed green body into a part with the strength of 400-;
(3) thermal treatment
Carburizing and austenitizing at 850-860 ℃, quenching by using quenching oil, and finally tempering to improve the strength of the part to over 1000 MPa;
(4) immersion oil
Immersing the whole part in anti-rust oil for 5min to form an oil film on the surface of the product, thereby achieving the anti-rust effect;
(5) package (I)
And packaging according to production requirements to prevent collision damage caused in the transportation process.
Example 4
The powder metallurgy wear-resistant stator is prepared from the following raw materials in percentage by mass: 2.18% of Ni, 0.97% of Mo, 0.86% of C and the balance of Fe.
The production process of the wear-resistant stator comprises the following steps:
(1) shaping of
Heating the middle die to 70 ℃, pressing the raw material powder prepared according to the requirement into a green body with certain strength under the pressure of 600-800 MPa;
(2) sintering
Sintering by using a mesh belt type sintering furnace, wherein the highest sintering temperature is 1121 ℃, and sintering the formed green body into a part with the strength of 400-;
(3) thermal treatment
Carburizing and austenitizing at 850-860 ℃, quenching by using quenching oil, and finally tempering to improve the strength of the part to over 1000 MPa;
(4) immersion oil
Immersing the whole part in anti-rust oil for 5min to form an oil film on the surface of the product, thereby achieving the anti-rust effect;
(5) package (I)
And packaging according to production requirements to prevent collision damage caused in the transportation process.
The bending strength of the stator prepared by the above examples 1-4 reaches above 1800MPa, the stator can not crack for more than 100 ten thousand times in the impact test under 16MPa, and the wear resistance in the 415-hour wear resistance test is less than 0.02.
Comparative example 1
The stator produced by using the materials of 0.8 percent of C, 2 percent of Cu, 0.5 percent of Mo, 1.7 percent of Ni and the balance of Fe is tempered after sintering and hardening, the bending strength of the product is only 1200-1300MPa, and the impact test can be carried out for 20 ten thousand times under 12 MPa.
Comparative example 2
The stators made of the same materials as in examples 1 to 4 were used without heat treatment, and were cracked when the test pressure reached 9.8MPa in the product test, and the performance and durability tests were not performed.
Fe. The addition of Mo and Ni elements greatly enhances the hardenability of the product, so that the product is more wear-resistant; mo element is added in a prealloying mode, so that the overall hardness and strength of a product matrix are improved; ni is added in a mixing mode, so that a small amount of nickel-rich austenite is arranged in the product, and the impact resistance of the product is increased;
the warm die technology is used for molding and pressing, the middle die is heated and controlled at 70 +/-3 ℃, and the pressability of the powder is improved, so that the green density is improved, and the wear resistance of the product is finally improved;
the heat treatment surface carburization temperature is 855 +/-5 ℃, the carburization carbon potential is 0.98 percent, and the wear resistance of the surface of the product and certain toughness of the core part are ensured.

Claims (5)

1. The powder metallurgy wear-resistant stator is characterized by being prepared from the following raw materials in percentage by mass: 1.83 to 2.18 percent of Ni, 0.76 to 0.97 percent of Mo, 0.61 to 0.86 percent of C and the balance of Fe.
2. The powder metallurgy wear-resistant stator according to claim 1, is prepared from the following raw materials in percentage by mass: 1.85 to 2.12 percent of Ni, 0.78 to 0.93 percent of Mo, 0.67 to 0.83 percent of C and the balance of Fe.
3. A process for producing a wear resistant stator according to claim 1 or 2, comprising the steps of:
(1) shaping of
Heating the middle mold for mold warming, pressing the raw material powder prepared according to the requirement into a green body with certain strength under the pressure of 600-800 MPa;
(2) sintering
Sintering the formed green body into a part with the strength of 400-600MPa by using a mesh-belt type sintering furnace;
(3) thermal treatment
Carburizing and austenitizing at 850-860 ℃, quenching by using quenching oil, and finally tempering to improve the strength of the part to over 1000 MPa;
(4) immersion oil
Immersing the whole part in anti-rust oil for 5min to form an oil film on the surface of the product, thereby achieving the anti-rust effect;
(5) package (I)
And packaging according to production requirements to prevent collision damage caused in the transportation process.
4. The production process according to claim 3, wherein the heating temperature of the middle mold in the step (1) is 70 ℃.
5. The production process according to claim 3, wherein the maximum sintering temperature of the step (2) is 1121 ℃.
CN202011427250.5A 2020-12-09 2020-12-09 Powder metallurgy wear-resistant stator and production process thereof Pending CN112522632A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011427250.5A CN112522632A (en) 2020-12-09 2020-12-09 Powder metallurgy wear-resistant stator and production process thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011427250.5A CN112522632A (en) 2020-12-09 2020-12-09 Powder metallurgy wear-resistant stator and production process thereof

Publications (1)

Publication Number Publication Date
CN112522632A true CN112522632A (en) 2021-03-19

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Application publication date: 20210319