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A high-end bearing steel material for machine tool bearing rings and its manufacturing method

A bearing ring and manufacturing method technology, applied in the field of special steel smelting and forging, can solve the problems of carbide segregation and unsatisfactory performance of steel materials, and achieve the effect of improving carbide level, uniform carbide distribution, and not easy to deform and crack.

Active Publication Date: 2020-12-18
建龙北满特殊钢有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the carbides in the steel material for bearing rings are segregated and distributed in a network shape, the performance of the steel material cannot meet the requirements of high-end CNC machine tools, the present invention provides a high-end bearing steel material for machine tool bearing rings and its manufacturing method

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  • A high-end bearing steel material for machine tool bearing rings and its manufacturing method
  • A high-end bearing steel material for machine tool bearing rings and its manufacturing method

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Embodiment 1

[0045] This embodiment provides a high-end bearing steel material for machine tool bearing rings, the chemical components contained include C: 0.93-0.98%, Si: 0.15-0.35%, Mn: 0.25-0.45%, Cr: 1.45~1.60%, Ni: 0.05~0.10%, Mo: 0.02~0.08%, Al: 0.015~0.035%, Cu: 0.06~0.10%, P≤0.010%, S≤0.008%, Nb: 0.010~0.045%, Y≤0.020%, Ce≤0.010%, Ti≤0.0015%, O≤0.0020%, As≤0.040%, Sn≤0.030%, Sb≤0.0050%, Pb≤0.0020%, and Si+Mn+Cr≥2.0%, The rest is Fe and unavoidable impurities.

[0046] Carbon is an important element that affects the performance of steel, and is one of the important elements to ensure that bearing steel can have sufficient hardenability, hardness and wear resistance. The carbon strengthening effect is very high, the carbon content in the steel increases, the yield point and tensile strength increase, but the toughness is significantly reduced. In order to improve the safety and reliability of the bearing steel, and consider controlling the carbon segregation of the steel ingot to im...

Embodiment 2

[0056] This embodiment provides a method for manufacturing high-end bearing steel materials for bearing rings of machine tools. The manufacturing method includes electric furnace→LF refining and VD process→die casting→hot delivery / cover cooling→heating and rolling→slow cooling→ball annealing;

[0057] In the electric furnace process:

[0058] Load pig iron, molten iron or steel material into the electric furnace, release the oxidized slag when the molten steel temperature is ≥1580°C and the C content is ≥0.30%, and start tapping the electric furnace. Slag, aluminum ingots, alloys and lime;

[0059] In the LF refining and VD process:

[0060] After the molten steel reaches the refining position, the temperature is raised to 1550°C, and ferrosilicon and new composite slag are added to form slag. After the slag is melted, diffusion deoxidizer is added in batches for slagging. When the slag reaches the refining slag system, that is, CaO 46-55% , SiO 2 ≤7%, Al 2 o 3 32~38%, M...

Embodiment 3

[0068] The difference between this embodiment and Embodiment 2 is only that in the electric furnace process of the manufacturing method of the high-end bearing steel material for the bearing ring of the machine tool in the present embodiment:

[0069] Put pig iron, molten iron or iron and steel material into the electric furnace according to the weight ratio of 4:6, and the iron and steel material uses non-Ti-containing steel group materials; when the molten steel temperature is ≥ 1580 °C and the C content is ≥ 0.30%, the oxidation slag is released, and start Electric furnace tapping, the amount of steel remaining in the electric furnace is more than 7 tons during the tapping process, to prevent the oxidation slag from being carried out during the tapping process, if the oxidation slag is brought in during the tapping process, the FeO, P in the oxidation slag 2 o 5 、TiO 2 It will be reduced to P and Ti during the refining process, resulting in the return of phosphorus and tit...

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Abstract

The invention relates to a high-end bearing steel material for a machine tool bearing ring and a manufacturing method of the high-end bearing steel material for the machine tool bearing ring, and belongs to the technical field of special steel smelting forging. The high-end bearing steel material aims to solve the problem that the performance of the steel material cannot meet the requirement of a high-end numerical control machine tool due to the fact that the carbide inside the steel material for the bearing ring is segregated and distributed in a mesh mode, the steel material is caused not to meet the requirement of the high-end numerical control machine tool, the invention provides the high-end bearing steel material for the machine tool bearing ring and the manufacturing method of the high-end bearing steel material for the machine tool bearing ring, and comprises the following steps of electric furnace, LF refining and VD process, die casting, hot charging / cover cooling, heating rolling, slow cooling, and spheroidizing annealing. According to the steel material and the method, Ni, Mo and rare earth element are added on the basis of existing bearing steel, the content of Al and Cu is strictly controlled, and a good mechanical property index is provided for the steel material; the carbide in the manufacturing process is effectively diffused, the carbide level of the steel material is improved, the steel material for the bearing ring of the machine tool has a high elastic limit, tensile strength, contact fatigue strength and wear resistance, and can effectively reduce the phenomena of fatigue peeling, blocking and the like.

Description

technical field [0001] The invention belongs to the technical field of special steel smelting and forging, and in particular relates to a high-end bearing steel material for machine tool bearing rings and a manufacturing method thereof. Background technique [0002] With the rapid development of numerical control technology, the technology of machine tool industry is also developing rapidly. Among them, high-speed machining can effectively improve the machining efficiency of machine tools and shorten the machining cycle of workpieces. This requires the machine tool spindle and its related components to meet the needs of high-speed machining. At present, the spindle bearings of CNC machine tools are basically limited to four structural types: angular contact ball bearings, cylindrical roller bearings, two-way thrust angular contact ball bearings and tapered roller bearings. [0003] The bearing ring is a ring-shaped part of a radial rolling bearing with one or several racew...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/06C22C38/42C22C38/48C21C5/52C21C7/06C21C7/10C21D8/00C21D1/32
CPCC21C5/52C21C7/06C21C7/10C21D1/32C21D8/005C21D2211/005C21D2211/009C22C38/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48Y02P10/20
Inventor 熊洪进陈列董贵文李彬王强马忠存陈迦杉杨平
Owner 建龙北满特殊钢有限责任公司
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