CN112522481A - Control method of net-shaped carbide of hot-rolled bearing steel - Google Patents
Control method of net-shaped carbide of hot-rolled bearing steel Download PDFInfo
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- CN112522481A CN112522481A CN202011271906.9A CN202011271906A CN112522481A CN 112522481 A CN112522481 A CN 112522481A CN 202011271906 A CN202011271906 A CN 202011271906A CN 112522481 A CN112522481 A CN 112522481A
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- bearing steel
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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
- C21D1/28—Normalising
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention is suitable for the technical field of bearing steel treatment, and provides a control method of net-shaped carbide of hot-rolled bearing steel, which comprises the following steps: step S100: carrying out hot rolling treatment on the bearing steel rolled piece; step S200: establishing a circulating water curtain cooling line; step S300: collecting the temperature of a bearing steel rolled piece before entering a water curtain; step S400: adjusting the water flow in the water curtain and the moving speed of the rolled piece on the roller way; step S500: collecting the temperature of a bearing steel rolled piece when the bearing steel rolled piece is discharged from a water curtain; corresponding experimental data are obtained through a plurality of experiments, wherein the influence on the cooling speed of the bearing steel rolled piece is realized through the difference between the water yield and the roller way running speed, so that the comparative experimental data are formed, and when subsequent bearing steel is rolled, the water yield and the roller way running speed can be adjusted according to the requirement and the experiment, the accurate control on the cooling of the bearing steel is realized, and the occurrence of reticular carbide caused by the improper control of the cooling speed is avoided.
Description
Technical Field
The invention belongs to the technical field of bearing steel treatment, and particularly relates to a control method of steel-mesh carbide of a hot-rolled bearing.
Background
Bearing steel is the steel used to make balls, rollers and bearing rings. Bearing steels have high and uniform hardness and wear resistance, as well as a high elastic limit. The requirements on the uniformity of chemical components of bearing steel, the content and distribution of non-metallic inclusions, the distribution of carbides and the like are all very strict, and the steel is one of the most strict steel types in all steel production. In 1976 the international organization for standardization ISO incorporated some common bearing steel numbers into international standards, which classified bearing steels as: the steel grade of the bearing steel is 17 in four types, namely full-quenched bearing steel, surface-hardened bearing steel, stainless bearing steel, high-temperature bearing steel and the like.
In the cooling process of the bearing steel after rolling, because the cooling speed of the bearing steel rolled piece is improperly controlled, excessive carbides in the bearing steel rolled piece are precipitated on grain boundaries to form network carbides, and the network carbides appear to prolong the service life of the prepared bearing.
Disclosure of Invention
The invention provides a control method of net-shaped carbide of hot-rolled bearing steel, which aims to solve the problem that in the cooling process of the bearing steel after rolling, because the cooling speed of a bearing steel rolled piece is improperly controlled, excessive carbide in the bearing steel rolled piece precipitates network carbide formed on grain boundaries, and the service life of the prepared bearing can be prolonged due to the occurrence of the net-shaped carbide.
The invention is realized in such a way that a control method of the net-shaped carbide of the hot-rolled bearing steel comprises the following steps:
step S100: carrying out hot rolling treatment on the bearing steel rolled piece;
step S200: establishing a circulating water curtain cooling line;
step S300: collecting the temperature of a bearing steel rolled piece before entering a water curtain;
step S400: adjusting the water flow in the water curtain and the moving speed of the rolled piece on the roller way;
step S500: collecting the temperature of a bearing steel rolled piece when the bearing steel rolled piece is discharged from a water curtain;
step S600: comparing the temperature, the roller table moving speed and the water flow numerical value before and after the rolled piece is cooled, and forming experimental data;
step S700: and carrying out accurate cooling speed control on the bearing steel rolled piece according to the acquired experimental data.
Preferably, the circulating water curtain in step S200 is provided with a water circulating system for cooling water after use.
Preferably, the circulating water curtain is composed of a plurality of water spray pipes and is sequentially arranged along the direction of the roller way.
Preferably, the step S200 further includes dividing the water curtain cooling line into zones, where the number of the water spray lights in each zone is the same, and the water temperature in each zone is different.
Preferably, in the step S100, the heat treatment is normalizing and high-temperature tempering of the bearing steel rolled piece.
Preferably, in step S700, different types of rolled piece cooling are adapted according to different cooling rates and different temperatures of the cooled rolled piece.
Preferably, the step S600 further includes data acquisition of the cooling speed of the rolling stock.
Compared with the prior art, the invention has the beneficial effects that: according to the control method of the net-shaped carbide of the hot-rolled bearing steel, the water curtain cooling line is established before the bearing steel is rolled, the experimental method is utilized to collect the water yield in the water curtain cooling line, the roller way running speed and other data, and the corresponding experimental data are obtained through a plurality of experiments, wherein the influence on the cooling speed of the bearing steel rolled piece is caused by the difference between the water yield and the roller way running speed, so that the comparative experimental data are formed, and when the subsequent bearing steel is rolled, the adjustment can be carried out according to the water yield and the roller way running speed of the experimental data, so that the accurate control of the cooling of the bearing steel is realized, and the net-shaped carbide caused by the improper control of the cooling speed is avoided.
Drawings
FIG. 1 is a schematic diagram of the process steps of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the present invention provides a technical solution: a control method of hot-rolled bearing steel reticular carbide comprises the following steps:
step S100: carrying out hot rolling treatment on the bearing steel rolled piece;
step S200: establishing a circulating water curtain cooling line;
step S300: collecting the temperature of a bearing steel rolled piece before entering a water curtain;
step S400: adjusting the water flow in the water curtain and the moving speed of the rolled piece on the roller way;
step S500: collecting the temperature of a bearing steel rolled piece when the bearing steel rolled piece is discharged from a water curtain;
step S600: comparing the temperature, the roller table moving speed and the water flow numerical value before and after the rolled piece is cooled, and forming experimental data;
step S700: and carrying out accurate cooling speed control on the bearing steel rolled piece according to the acquired experimental data.
In the embodiment, in the using process, firstly, the bearing steel rolled piece needs to be thermally treated, then, the thermally treated rolled piece needs to be cooled, before cooling, a water curtain cooling line needs to be established, a water curtain cooling box consists of a plurality of water discharge pipes, the water discharge pipes are sequentially arranged along the extension direction of a roller way, when the bearing steel rolled piece passes through the roller way and is cooled by a water curtain, temperature data acquisition needs to be carried out before the rolled piece enters the water curtain, then, when the rolled piece enters the water curtain, a worker can adjust the running speed of the roller way, simultaneously, the water discharge amount of the water discharge pipes is continuously adjusted, simultaneously, data corresponding to continuous adjustment is acquired, then, after the rolled piece passes through the roller way and is cooled by the water curtain, the cooled temperature can be acquired, and simultaneously, the cooling time of the rolled piece is calculated, collecting data such as temperature before and after the bearing steel rolled piece is cooled, roller way operation speed, water yield of a water discharge pipe, cooling time and the like, concentrating the collected data, forming laboratory data, obtaining roller way operation speed suitable for cooling the rolled piece and water yield data of the water discharge pipe after multiple data collection and experiments, adjusting the water yield of a water curtain and the roller way operation speed according to the experimental data when formal bearing steel rolled piece preparation is carried out, adjusting different roller way speeds and water yields to realize different cooling speed adjustment of the bearing steel rolled piece, arranging a plurality of different areas on a water curtain cooling line, independently connecting the water discharge pipe in each area with a cooling pool, and further accelerating the cooling speed of the bearing steel rolled piece when the bearing steel rolled piece is conveyed to all low-temperature areas through the roller way rapidly due to different temperatures in each cooling pool, and then the cooling speed of the bearing steel rolled piece can be further adjusted, the accurate control of the cooling speed is realized, and the appearance of reticular carbide is avoided.
Further, the circulating water curtain in step S200 is provided with a water circulating system for cooling the used water.
In the present embodiment, after the water in the water curtain falls from the drain pipe and cools the rolled material, the water flows into the water circulation system, and is filtered and the like, and then is injected into the water tank again for recycling.
Furthermore, the circulating water curtain is composed of a plurality of water spray pipes which are sequentially arranged along the direction of the roller way.
In the embodiment, in the use process, the water curtain line is formed by arranging the plurality of water spray pipes, and when the rolled piece passes through the water curtain in the transportation of the roller way, the rolled piece can be cooled by water.
Further, step S200 includes dividing the water curtain cooling line into zones, where the number of water spray lights in each zone is the same, and the water temperature in each zone is different.
In this embodiment, because be provided with a plurality of different regions on the water curtain cooling line, the equal independent connection of drain pipe in every region has the cooling bath, and the temperature in every cooling bath is different, transports bearing steel rolled piece through the roll table fast all when under the low temperature region, alright further accelerate bearing steel rolled piece's cooling rate.
Further, in step S100, the heat treatment is normalizing and high-temperature tempering of the bearing steel rolled piece.
In the embodiment, the rolled piece is heated to be 30-50 ℃ above the critical temperature, is cooled in static air after being kept warm for a proper time, is then heated to be a certain temperature below the critical temperature, is kept warm for a certain time, is then cooled, and has good comprehensive mechanical properties (certain strength, hardness, plasticity and toughness) after being tempered at high temperature.
Further, in step S700, different types of rolled piece cooling are adapted according to the difference in cooling rate and the difference in temperature of the cooled rolled piece.
In this embodiment, the setting of utilization experimental data, alright cool off different kinds of rolled pieces to can be more accurate according to experimental data control the cooling rate, avoid the precipitation of carbide.
Further, step S600 includes data acquisition of the cooling speed of the rolling stock.
In the embodiment, in the using process, after the rolled piece is cooled by the water curtain through the roller way, the cooled temperature can be collected, meanwhile, the time for cooling the rolled piece is calculated, and collected data such as the temperature before and after the bearing steel rolled piece is cooled, the running speed of the roller way, the water yield of the drain pipe, the cooling time and the like are concentrated to form laboratory data.
Before cooling, a water curtain cooling line needs to be established, a water curtain cooling box consists of a plurality of drain pipes, the drain pipes are sequentially arranged along the extension direction of a roller way, when a bearing steel rolled piece is cooled by the roller way through the water curtain, temperature data acquisition needs to be carried out before the rolled piece enters the water curtain, then when the rolled piece enters the water curtain, a worker can adjust the operation speed of the roller way, meanwhile, the water discharge amount of the drain pipes is continuously adjusted, corresponding data during continuous adjustment are acquired, then, after the rolled piece is cooled by the roller way through the water curtain, the temperature after cooling can be acquired, the time for cooling the rolled piece is simultaneously calculated, and the acquired data of the temperature before and after the bearing steel rolled piece is cooled, the operation speed of the roller way, the water discharge amount of the drain pipes, the cooling time and the like are concentrated to form laboratory data, after a plurality of times of data acquisition and experiments, the running speed of the roller way suitable for cooling the rolled piece and the water yield data of the water discharge pipe can be obtained, when the formal bearing steel rolled piece is prepared, the water yield in the water curtain and the running speed of the roller way can be adjusted according to experimental data, and different roller way speeds and water amounts are adjusted, so that different cooling speeds of the bearing steel rolled piece can be adjusted, secondly, a plurality of different areas are arranged on the water curtain cooling line, the drain pipe in each area is independently connected with a cooling pool, and the temperature in each cooling pool is different, when the bearing steel rolled piece is quickly conveyed to a region with low temperature through the roller way, the cooling speed of the bearing steel rolled piece can be further accelerated, and then the cooling speed of the bearing steel rolled piece can be further adjusted, the accurate control of the cooling speed is realized, and the appearance of reticular carbide is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A control method of net carbide of hot-rolled bearing steel is characterized in that: the method comprises the following steps:
step S100: carrying out hot rolling treatment on the bearing steel rolled piece;
step S200: establishing a circulating water curtain cooling line;
step S300: collecting the temperature of a bearing steel rolled piece before entering a water curtain;
step S400: adjusting the water flow in the water curtain and the moving speed of the rolled piece on the roller way;
step S500: collecting the temperature of a bearing steel rolled piece when the bearing steel rolled piece is discharged from a water curtain;
step S600: comparing the temperature, the roller table moving speed and the water flow numerical value before and after the rolled piece is cooled, and forming experimental data;
step S700: and carrying out accurate cooling speed control on the bearing steel rolled piece according to the acquired experimental data.
2. The method for controlling the net-like carbide of hot-rolled bearing steel according to claim 1, wherein: the circulating water curtain in the step S200 is provided with a water circulating system for cooling water after use.
3. The method for controlling the net-like carbide of hot-rolled bearing steel according to claim 1, wherein: the circulating water curtain is composed of a plurality of water spray pipes and is sequentially arranged along the direction of the roller way.
4. The method for controlling the net-like carbide of hot-rolled bearing steel according to claim 1, wherein: in the step S200, the method further includes dividing regions on the water curtain cooling line, where the number of the water spray lights in each region is the same, and the water temperature in each region is different.
5. The method for controlling the net-like carbide of hot-rolled bearing steel according to claim 1, wherein: in the step S100, the heat treatment is normalizing and high-temperature tempering of the bearing steel rolled piece.
6. The method for controlling the net-like carbide of hot-rolled bearing steel according to claim 1, wherein: in the step S700, different types of rolled piece cooling are adapted according to different cooling speeds and different temperatures of the cooled rolled piece.
7. The method for controlling the net-like carbide of hot-rolled bearing steel according to claim 1, wherein: in the step S600, data acquisition of the cooling speed of the rolled piece is further included.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011271906.9A CN112522481A (en) | 2020-11-13 | 2020-11-13 | Control method of net-shaped carbide of hot-rolled bearing steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011271906.9A CN112522481A (en) | 2020-11-13 | 2020-11-13 | Control method of net-shaped carbide of hot-rolled bearing steel |
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| CN112522481A true CN112522481A (en) | 2021-03-19 |
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| CN202011271906.9A Pending CN112522481A (en) | 2020-11-13 | 2020-11-13 | Control method of net-shaped carbide of hot-rolled bearing steel |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102034284A (en) * | 2010-09-28 | 2011-04-27 | 魏卿轩 | Device for recording real-time controlled cooling temperature curve graph of steel on controlled cooling line after hot rolling |
| CN202181323U (en) * | 2011-06-30 | 2012-04-04 | 浙江健力股份有限公司 | Cooling control device after hot-rolling and punching of GCr15 bearing steel tube blank |
| CN105499285A (en) * | 2015-12-31 | 2016-04-20 | 柳州钢铁股份有限公司 | Automatic atomization spray cooling temperature controlling device |
| CN105817487A (en) * | 2016-03-16 | 2016-08-03 | 山东钢铁股份有限公司 | Control method for bearing steel bar network carbide and device for implementing method |
| CN106086353A (en) * | 2016-08-29 | 2016-11-09 | 湖北新冶钢有限公司 | Control the milling method that big cross section GCr15 bearing steel net carbide separates out |
| CN106636591A (en) * | 2015-11-03 | 2017-05-10 | 北京京诚瑞信长材工程技术有限公司 | Rolling and cooling control method of large-specification high-carbon chromium bearing steel |
-
2020
- 2020-11-13 CN CN202011271906.9A patent/CN112522481A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102034284A (en) * | 2010-09-28 | 2011-04-27 | 魏卿轩 | Device for recording real-time controlled cooling temperature curve graph of steel on controlled cooling line after hot rolling |
| CN202181323U (en) * | 2011-06-30 | 2012-04-04 | 浙江健力股份有限公司 | Cooling control device after hot-rolling and punching of GCr15 bearing steel tube blank |
| CN106636591A (en) * | 2015-11-03 | 2017-05-10 | 北京京诚瑞信长材工程技术有限公司 | Rolling and cooling control method of large-specification high-carbon chromium bearing steel |
| CN105499285A (en) * | 2015-12-31 | 2016-04-20 | 柳州钢铁股份有限公司 | Automatic atomization spray cooling temperature controlling device |
| CN105817487A (en) * | 2016-03-16 | 2016-08-03 | 山东钢铁股份有限公司 | Control method for bearing steel bar network carbide and device for implementing method |
| CN106086353A (en) * | 2016-08-29 | 2016-11-09 | 湖北新冶钢有限公司 | Control the milling method that big cross section GCr15 bearing steel net carbide separates out |
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