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CN-121992285-A - Hot-rolled cutting bearing ring sleeve processing technology

CN121992285ACN 121992285 ACN121992285 ACN 121992285ACN-121992285-A

Abstract

The invention belongs to the technical field of alloy products. The invention provides a hot-rolled cutting bearing sleeve processing technology which comprises the steps of S1, adding 95.3-95.8 parts of pure iron, 1.5-1.6 parts of chromium strips and 0.48-0.52 part of carbon blocks into a vacuum induction furnace according to parts by weight, vacuumizing to be less than or equal to 1Pa, flushing argon gas for melting, S2, adding 0.45-0.5 part of carbon blocks into the furnace after melting, vacuumizing, carrying out carbon deoxidation, controlling the vacuum degree to be 13-18Pa, carrying out carbon deoxidation for 30-35min, and introducing argon gas again, S3, sequentially adding 0.04-0.045 part of aluminum blocks, 0.5-0.6 part of silicon blocks and 0.8-0.85 part of manganese blocks into the furnace, reaching 1500-1540 ℃, then adding 0.015-0.016 part of rare earth cerium, 0.011-0.013 part of vanadium-doped titanium dioxide and 0.03-0.035 part of lanthanum-boron composite powder, casting after forging and heat preservation, carrying out heat preservation treatment, and rolling to obtain a bearing, namely a steel, a cutting bearing and a round bar. The invention improves the mechanical property of the high-carbon chromium bearing steel by improving the content of rare earth cerium, and simultaneously further improves the hardenability of the high-carbon chromium bearing steel.

Inventors

  • YANG MINGXUE
  • LI YANG
  • Chai Mengtao

Assignees

  • 河南申轴冷辗科技有限公司

Dates

Publication Date
20260508
Application Date
20260309

Claims (9)

  1. 1. The hot-rolled cutting bearing ring sleeve processing technology is characterized by comprising the following steps of: s1, adding 95.3-95.8 parts of pure iron, 1.5-1.6 parts of chromium strips and 0.48-0.52 parts of carbon blocks into a vacuum induction furnace according to parts by weight, vacuumizing until the pressure is less than or equal to 1Pa, and charging argon gas for melting; s2, after melting, adding 0.45-0.5 part of carbon block into a vacuum induction furnace, vacuumizing, performing carbon deoxidation, controlling the vacuum degree at 13-18Pa, and introducing argon again for 30-35 min; S3, sequentially adding 0.04-0.045 part of aluminum block, 0.5-0.6 part of silicon block and 0.8-0.85 part of manganese block into a vacuum induction furnace, wherein the temperature reaches 1500-1540 ℃, then adding 0.015-0.016 part of rare earth cerium, 0.011-0.013 part of vanadium-doped titanium dioxide and 0.03-0.035 part of lanthanum-boron composite powder, preserving heat for 3-5min, pouring, and sequentially forging and heat treating to obtain a bearing steel round bar material; and S4, sequentially performing heating, perforating, rolling and hot cutting procedures on the round bearing steel rod material obtained in the step S3 to obtain the hot-rolled cut bearing sleeve.
  2. 2. The hot rolled cutting bearing ring sleeve processing technology according to claim 1, wherein the preparation method of the vanadium-doped titanium dioxide is as follows: A1, mixing 0.54g of cetyl trimethyl ammonium bromide, 52-55mL of absolute ethyl alcohol and 10-12mL of deionized water, adding 10-10.5mL of tetra-n-butyl titanate, 0.9-1mL of acetylacetone and 0.1g of ammonium metavanadate, and stirring at room temperature to obtain a solution I; A2, mixing 10.5-11.5mL of absolute ethyl alcohol and 0.6-0.7mL of deionized water, and dripping concentrated nitric acid to adjust the pH to 3+/-0.05 to obtain a solution II; a3, adding the solution II obtained in the step A2 into the solution I obtained in the step A1 under stirring, continuously stirring to obtain sol, aging after the sol is gelled, and roasting to obtain the product.
  3. 3. The hot rolled cutting bearing ring sleeve processing technology according to claim 2, wherein in A3, the specific operation of aging is that the hot rolled cutting bearing ring sleeve is aged for 9.5-11 hours at room temperature and then aged for 9.5-11 hours at 65+/-2 ℃.
  4. 4. The hot-rolled cut bearing ring sleeve processing technology according to claim 2, wherein in A3, the roasting temperature is 450+/-10 ℃ and the roasting time is 3-3.2h.
  5. 5. The hot rolled cut bearing ring sleeve processing technology according to claim 1, wherein the lanthanum-boron composite powder comprises lanthanum powder and boron powder, and the mass ratio of the lanthanum powder to the boron powder is 2:1.
  6. 6. The hot rolled cutting bearing ring sleeve processing technology according to claim 1 or 5, wherein the lanthanum-boron composite powder is prepared by mixing lanthanum powder and boron powder, ball-milling and dispersing in an absolute ethyl alcohol dispersion medium for 5-6h, and then vacuum drying.
  7. 7. The hot-rolled cutting bearing ring sleeve processing technology according to claim 6, wherein the washing is specifically performed at a drying temperature of 60+/-2 ℃ for 9-12 hours.
  8. 8. The hot rolled cut bearing race processing process according to claim 1, characterized in that in S3, the forging start temperature is 1150-1200 ℃ and the final forging temperature is 850±10 ℃.
  9. 9. The hot cut bearing race process of claim 1 wherein in S3, the heat treatment comprises annealing and quenching.

Description

Hot-rolled cutting bearing ring sleeve processing technology Technical Field The invention belongs to the technical field of alloy products, and particularly relates to a hot-rolled cutting bearing ring sleeve processing technology. Background The bearing is used as the most basic and important part, and is called as a high-end equipment joint. The device has quite full use in the fields of important equipment (such as machine tools and cars) and emerging industries (such as wind power generation and high-speed rail cars). The bearing ring is an annular part of a centripetal rolling bearing with one or more raceways, and high-carbon chromium bearing steel is generally adopted for producing the bearing ring. The rare earth elements are added to refine the steel structure, so that irregular large-size inclusions are changed into small-size regular-shape rare earth inclusions, the rare earth inclusions are distributed uniformly, the possibility of crack sources is greatly reduced, and further, the tensile strength is improved. In a certain range, the mechanical property (tensile strength) of the prepared high-carbon chromium bearing steel is continuously improved along with the increase of the addition amount/content of the rare earth. However, if the rare earth cerium content is excessively high, certain segregation occurs at grain boundaries, which adversely affects carbon atom diffusion, and the occurrence probability of cementite is reduced, resulting in a decrease in hardenability (depth of hardening layer/end quenching curve) of steel. Disclosure of Invention Aiming at the problems, the invention provides a hot-rolled cutting bearing ring sleeve processing technology, which improves the mechanical property (tensile strength) of the high-carbon chromium bearing steel and further improves the hardenability of the high-carbon chromium bearing steel by improving the content of rare earth cerium. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a hot-rolled cutting bearing ring sleeve processing technology comprises the following steps: S1, adding 95.3-95.8 parts of pure iron, 1.5-1.6 parts of chromium strips and 0.48-0.52 part of carbon blocks into a vacuum induction furnace according to parts by weight, starting a vacuum pump, vacuumizing the vacuum induction furnace, switching on a power supply, flushing 50KPa argon into the vacuum induction furnace, and starting a melting stage; s2, after melting, adding 0.45-0.5 part of carbon block into the vacuum induction furnace again, vacuumizing, performing carbon deoxidation, controlling the vacuum degree at 15-18Pa, performing carbon deoxidation for 30-35min, and introducing argon gas at 10KPa again; S3, sequentially adding 0.04-0.045 part of aluminum block, 0.5-0.6 part of silicon block and 0.8-0.85 part of manganese block into the vacuum induction furnace of S2, measuring the temperature after 3-5min, adjusting the power to enable the temperature to reach 1500-1540 ℃, adding 0.015-0.016 part of rare earth cerium, 0.011-0.013 part of vanadium-doped titanium dioxide and 0.03-0.035 part of lanthanum-boron composite powder, pouring after heat preservation for 3-5min, and sequentially forging and heat treating to obtain the round bar material of the bearing steel; and S4, sequentially carrying out the procedures of heating, perforating, rolling and hot cutting on the round bearing steel bar material obtained in the step S3, and obtaining the hot-rolled cut bearing sleeve. Further, the preparation method of the vanadium-doped titanium dioxide comprises the following steps: A1, mixing 0.54g of cetyl trimethyl ammonium bromide, 52-55mL of absolute ethyl alcohol and 10-12mL of deionized water, adding 10-10.5mL of tetra-n-butyl titanate, 0.9-1mL of acetylacetone and 0.1g of ammonium metavanadate, and stirring at room temperature for 1h to obtain a solution I; A2, mixing 10.5-11.5mL of absolute ethyl alcohol and 0.6-0.7mL of deionized water, and dripping concentrated nitric acid to adjust the pH to 3+/-0.05 to obtain a solution II; A3, adding the solution II obtained by the A2 into the solution I obtained by the magnetically stirred A1 at the speed of 0.05-0.1mL/s, continuously stirring for 4 hours to obtain transparent stable sol, aging after the sample is gelled, and roasting to obtain the vanadium-doped titanium dioxide. Further, in A3, the specific operation of aging is that the mixture is aged for 9.5 to 11 hours at room temperature, and then the mixture is heated to 65+/-2 ℃ to continue aging for 9.5 to 11 hours. Further, in A3, the roasting temperature is 450+/-10 ℃ and the roasting time is 3-3.2h. Further, the lanthanum-boron composite powder comprises lanthanum powder and boron powder, and the mass ratio of the lanthanum powder to the boron powder is 2:1. Further, the preparation method of the lanthanum-boron composite powder comprises the steps of mixing lanthanum powder and boron powder, ball-milling and disper