CN111004895A - Preparation method of high-purity M50 bearing steel ferrule blank - Google Patents
Preparation method of high-purity M50 bearing steel ferrule blank Download PDFInfo
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- CN111004895A CN111004895A CN201911412525.5A CN201911412525A CN111004895A CN 111004895 A CN111004895 A CN 111004895A CN 201911412525 A CN201911412525 A CN 201911412525A CN 111004895 A CN111004895 A CN 111004895A
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- Prior art keywords
- bearing steel
- forging
- purity
- preparation
- blank
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
- B21H1/12—Making articles shaped as bodies of revolution rings of restricted axial length rings for ball or roller bearings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/04—Making machine elements ball-races or sliding bearing races
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Rolling Contact Bearings (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a preparation process of a high-purity M50 bearing steel ferrule blank, aiming at providing a preparation method of a high-purity M50 bearing steel ferrule blank, which can improve the purity of M50 bearing steel, improve the microstructure of the bearing steel, refine carbide particles in the bearing steel, improve the mechanical property and prolong the service life of the bearing steel, and comprises the following steps: preparing bearing steel; heat treatment; free forging; punching; controlling surface decarburization; controlling cracks; controlling a forging flow line; rolling; a preparation process of a high-purity M50 bearing steel ferrule blank subjected to post-forging heat treatment.
Description
Technical Field
The invention relates to a forging method of a bearing ring forge piece, in particular to a preparation method of a high-purity M50 bearing steel sleeve blank.
Background
The bearing ring is an annular part of a centripetal rolling bearing with one or more raceways, but the metal flow line of the process forging prepared by the bearing ring forging method in the prior art is disordered and irregular, carbide particles with large volume and different forms exist, fractured holes exist in the center of the carbide, and microcracks exist between the periphery of the carbide and a matrix.
Therefore, the above problems should be solved in the process of preparing the bearing steel ferrule.
Disclosure of Invention
Aiming at the existing problems, the invention provides a preparation method of a high-purity M50 bearing steel ferrule blank, which comprises the following steps,
(1) preparing bearing steel, wherein the bearing steel comprises basic components of M50 bearing steel and strong carbide;
(2) carrying out heat treatment on the raw material, heating the raw material to 800-;
(3) forging, in which surface decarburization control, crack control and forging flow line control are carried out on the surface of a workpiece in the forging process;
(4) and (4) annealing, forging, annealing the workpiece, heating the workpiece to 800-.
The invention is further improved in that: the strong carbon compounds include V strong carbides and Mo strong carbides.
The invention is further improved in that: in the forging step, the striking force of the forging blank is 750kg, the blank making mode is an open type, namely, the free end is beaten and the end face is blindly punched, the other face shadow is punched and reamed, turned and reamed and is in open width, the rolling and reaming mode adopts a vertical ring rolling machine for rolling and reaming, the rolling pressure is 15MPa, the reaming speed is 1.8-2.0 m/min, and the rotating speed of a rolling wheel is 81 rpm.
The invention is further improved in that: in the forging step, the temperature of the workpiece is not lower than 983 degrees in the whole forging process.
The invention is further improved in that: in the forging step, the whole forging processing process is carried out under a protective atmosphere so as to control the contents of oxygen elements and hydrogen elements in the bearing steel.
The invention is further improved in that: in the annealing step, an annealing box is adopted for annealing, and during annealing, the annealing box is sealed by mixing charcoal scraps and cast iron scraps in proportion and then adding the mixture into a hot sealing groove.
The invention is further improved in that: an infrared thermometer is installed on the vertical ring rolling mill to monitor the forge piece in real time, and the environment temperature for processing the ring-shaped piece is guaranteed to be higher than 950 ℃ during ring rolling processing.
The invention has the beneficial effects that: the preparation method of the high-purity M50 bearing steel ferrule blank can improve the purity of M50 bearing steel, improve the microstructure of the bearing steel, refine carbide particles in the bearing steel, improve the mechanical property and prolong the service life of the bearing steel ferrule blank.
Drawings
FIG. 1 is a schematic view of a heat treatment heating curve;
fig. 2 is a schematic view of an annealing heating curve.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
A preparation method of a high-purity M50 bearing steel ferrule blank specifically comprises the following steps,
(1) preparing bearing steel, wherein the bearing steel comprises basic components of M50 bearing steel, and strong carbide of V and strong carbide of Mo;
(2) the raw material was heat treated before forging, and the heating profile was as shown in FIG. 1. Processing the raw material to 816 ℃, preserving heat for 3.5h, then heating to 1033 ℃, and preserving heat for 3.5 h;
(3) forging, in which surface decarburization control, crack control and forging flow line control are carried out on the surface of a workpiece in the forging process;
(4) and (3) annealing and forging, annealing the workpiece, heating the workpiece to 871 ℃ according to a heating curve shown in figure 2, keeping the temperature for a certain time according to the size of the workpiece, and then slowly cooling to room temperature.
In the preparation method of the high-purity M50 bearing steel ferrule blank provided by the embodiment, on the premise that basic components of M50 bearing steel are not changed, a raw material with a low content of V, Mo strong carbide forming elements is selected, so that the formation of large-particle carbides is fundamentally reduced, in the forging process, the content of harmful metal elements such As Ti, Ca, As, Sn, Sb, Pb and the like in the bearing steel is controlled, in the forging step, the striking force of a forging blank is 750kg, the blank making mode is open, namely free end cake making and end face blind punching, the other face shadow punching, overturning hole expanding and flat width are controlled, in the rolling and expanding mode, a vertical ring rolling machine is adopted for rolling and expanding, one-step forming is carried out, the rolling pressure is 15MPa, the hole expanding speed is 1.8-2.0M/min, the rolling wheel rotating speed is 81rpm, in the forging step, the temperature of a workpiece is not lower than 983 ℃ in the whole forging process, and the whole forging process is carried out under the protection, so as to control the contents of oxygen element and hydrogen element in the bearing steel. In the annealing step, an annealing box is adopted for annealing, and during annealing, the annealing box is sealed by mixing charcoal scraps and cast iron scraps in proportion and then adding the mixture into a hot sealing groove. An infrared thermometer is installed on the vertical ring rolling mill to monitor the forge piece in real time, and the environment temperature for processing the ring-shaped piece is guaranteed to be higher than 950 ℃ during ring rolling processing.
The beneficial effect of this embodiment is: according to the preparation method of the high-purity M50 bearing steel ferrule blank, the purity of the M50 bearing steel can be improved, the microstructure of the bearing steel is improved, carbide particles in the bearing steel are refined, the mechanical property of the bearing steel is improved, and the service life of the bearing steel ferrule is prolonged.
The above-described embodiments are merely illustrative of the present invention and are not intended to limit the present invention. The invention may be embodied in other forms not specifically described herein. All technical solutions formed by adopting equivalent substitution or transformation belong to the protection scope claimed by the invention.
Claims (7)
1. A preparation method of a high-purity M50 bearing steel ferrule blank is characterized by comprising the following steps: the method specifically comprises the following steps of,
(1) preparing bearing steel, wherein the bearing steel comprises basic components of M50 bearing steel and strong carbide;
(2) carrying out heat treatment on the raw material, heating the raw material to 800-;
(3) forging, in which surface decarburization control, crack control and forging flow line control are carried out on the surface of a workpiece in the forging process;
(4) and (4) annealing, forging, annealing the workpiece, heating the workpiece to 800-.
2. The preparation method of the high-purity M50 bearing steel ferrule blank as claimed in claim 1, is characterized in that: the strong carbon compounds include V strong carbides and Mo strong carbides.
3. The preparation method of the high-purity M50 bearing steel ferrule blank as claimed in claim 1, is characterized in that: in the forging step, the striking force of the forging blank is 750kg, the blank making mode is an open type, namely, the free end is beaten and the end face is blindly punched, the other face shadow is punched and reamed, turned and reamed and is in open width, the rolling and reaming mode adopts a vertical ring rolling machine for rolling and reaming, the rolling pressure is 15MPa, the reaming speed is 1.8-2.0 m/min, and the rotating speed of a rolling wheel is 81 rpm.
4. The preparation method of the high-purity M50 bearing steel ferrule blank as claimed in claim 1, is characterized in that: in the forging step, the temperature of the workpiece is not lower than 983 degrees in the whole forging process.
5. The preparation method of the high-purity M50 bearing steel ferrule blank as claimed in claim 1, is characterized in that: in the forging step, the whole forging processing process is carried out under a protective atmosphere so as to control the contents of oxygen elements and hydrogen elements in the bearing steel.
6. The preparation method of the high-purity M50 bearing steel ferrule blank as claimed in claim 1, is characterized in that: in the step of returning goods, an annealing box is adopted for annealing, and during annealing, the annealing box is sealed by adding the mixed charcoal scraps and cast iron scraps into a hot sealing groove.
7. The preparation method of the high-purity M50 bearing steel ferrule blank as claimed in claim 3, is characterized in that: an infrared thermometer is installed on the vertical ring rolling mill to monitor the forge piece in real time, and the environment temperature for processing the ring-shaped piece is guaranteed to be higher than 950 ℃ during ring rolling processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911412525.5A CN111004895A (en) | 2019-12-31 | 2019-12-31 | Preparation method of high-purity M50 bearing steel ferrule blank |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911412525.5A CN111004895A (en) | 2019-12-31 | 2019-12-31 | Preparation method of high-purity M50 bearing steel ferrule blank |
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| CN111004895A true CN111004895A (en) | 2020-04-14 |
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| CN201911412525.5A Pending CN111004895A (en) | 2019-12-31 | 2019-12-31 | Preparation method of high-purity M50 bearing steel ferrule blank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114871695A (en) * | 2022-04-24 | 2022-08-09 | 中国科学院金属研究所 | M50 steel bearing ring, preparation method thereof and bearing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106002096A (en) * | 2016-06-08 | 2016-10-12 | 中航工业哈尔滨轴承有限公司 | One-time fire forging method for M50 steel bearing ring forge piece |
| CN106001379A (en) * | 2016-05-23 | 2016-10-12 | 辽宁银捷装备科技股份有限公司 | Forging process for bearing rings made of M50 steel |
-
2019
- 2019-12-31 CN CN201911412525.5A patent/CN111004895A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106001379A (en) * | 2016-05-23 | 2016-10-12 | 辽宁银捷装备科技股份有限公司 | Forging process for bearing rings made of M50 steel |
| CN106002096A (en) * | 2016-06-08 | 2016-10-12 | 中航工业哈尔滨轴承有限公司 | One-time fire forging method for M50 steel bearing ring forge piece |
Non-Patent Citations (2)
| Title |
|---|
| 《锻件质量分析》编写组: "《锻件质量分析》", 31 January 1983, 机械工业出版社 * |
| 刘仁: "M50 钢热变形行为及其微观组织研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114871695A (en) * | 2022-04-24 | 2022-08-09 | 中国科学院金属研究所 | M50 steel bearing ring, preparation method thereof and bearing |
| CN114871695B (en) * | 2022-04-24 | 2024-02-09 | 中国科学院金属研究所 | M50 steel bearing ring, preparation method thereof and bearing |
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Application publication date: 20200414 |