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Forging knowledge of high carbon steel (bearing steel forging)

Forging knowledge of high carbon (C) steel (bearing steel forging) Abstract: A new method for weft tension testing of looms based on virtual instrument (appliance) Preparation of ZnO nanofilm (thin and soft transparent sheet by electrophoresis) ) Research machinery manufacturing enterprises should enhance the strain capacity of high-speed machining center structure (Structure) features and advantages Thyristor soft starter will gradually replace the traditional auto-coupling compensator China's machine tool industry will become bigger and stronger with scientific and technological content Is the key UG system management CNC machining typical question and answer machine tool model introduction Power analyzer application Major technology (Technology) equipment localization strategy (strategy) mode analysis The basic requirements of CNC machine tool maintenance (wéi xiu) _ tools and spare parts requirements K920 Welding machine fixed small welding rail construction method Zhejiang Province: Mechanical and electrical products import and export "uneven heat and cold" shape and position of unspecified tolerance CNC machine tool fault (fault) diagnosis and maintenance Several examples of machine tool spindle deflection analysis method involute interpolation Discussion on related issues Shanghai maglev special CNC machine tools in Shenyang machine tools to build CNC programming general steps knowledge temperature hardness bearing low temperature avoid water or oil medium processing (processing) more than the bearing is called rolling bearing has compressive strength fatigue limit hardness high wear resistance certain toughness The hardenability of sulfur and phosphorus is very strictly controlled. A high-grade high-quality steel with a specific gravity of 7.81. Bearing forging temperature. Initial forging temperature and final satin temperature. Forging removal of surface defects Try to avoid entering the brittle zone and pre-heat treatment for spheroidization (annealing process).
The full name of bearing steel is rolling bearing steel, which has high compressive strength and fatigue limit, high hardness, high wear resistance and certain toughness, good hardenability, and extremely controlled sulfur and phosphorus. It is a kind of high-grade high-quality steel, which can be used as cold-worked tool steel. Specific gravity: 7.81
(1) Forging temperature of bearing steel
(1) Initial forging temperature: 1150 (1120) and final satin temperature: 850 (800) degrees.
(2) Remove surface defects before forging, and try to heat quickly after preheating.
(3) During warm processing, the blue brittle area of 200~400 degrees should be avoided. When hot working, avoid entering the high temperature brittle zone (greater than 1250). Should try to avoid entering the hot crisp zone (800 ~ 950 degrees).
(2) Heat treatment after forging
(1) After forging --- pre-heat treatment (spheroidization (annealing process) annealing) --- final heat treatment (quenching + low temperature tempering)
(2) Purpose of spheroidizing annealing: reduce hardness, facilitate processing, and prepare for quenching. When the single-row tapered roller bearing selects the bearing according to the size of the load, compared with the point contact of the ball bearing, the main elements in the roller bearing are in line contact, which is easy to bear the load, and the deformation after loading is also small. Tapered roller bearings are a type of rolling bearing and are widely used in modern machinery. It relies on rolling contact between the main elements to support the rotating parts. Roller bearings are now mostly standardized. Roller bearings have the advantages of small torque required for starting, high rotation accuracy, and convenient selection.
Spheroidizing annealing process (process): Heating to 750 ~ 770 degrees, holding for a certain period of time, and cooling slowly to below 600 degrees in air.
(3) Quenching + low temperature tempering and hardness table of various bearing steels
Steel grade quenching temperature and quenching medium (substance that plays a decisive role) Low temperature tempering hardness (Hardness) HRCGCr6 800~820 water or oil 150~170 62~64GCr9 800~830 water or oil 150~170 62~64GCr9SiMn 810~820 water Or oil 150~160 62~64GCr15 820~846 oil 150~160 62~64 GCr15SiMn 800~840 oil 150~170 62~64
(3) Quenching and quenching medium
(1) Quenching color (experience) White is the hardest and brittle, yellow is hard and tough, and blue is soft and tough.
(2) Quenching medium (substance that plays a decisive role) A water: the general temperature should not exceed 40 degrees, and there should be no impurities such as oil and soap. Aqueous solution of B salt and alkali: add 5~10% salt or alkali to the water. The cooling rate of the salt solution is ten times that of water, and the hardness is high and uniform, but the tissue stress is large and has a certain rust effect. The temperature is less than 60 degrees. Alkaline solution (caustic sodium aqueous solution) is highly corrosive and has a small range of application. C oil: including engine oil, spindle oil, transformer oil, diesel oil, etc. Deformation and cracking can be reduced. Not suitable for carbon (C) steel. Oil temperature: 60 ~ 80 degrees, the highest does not exceed 100 ~ 120 degrees.
(4) Tempering temperature (temperature)
The bearing steel is tempered at low temperature. Tapered roller bearings are a type of rolling bearing and are widely used in modern machinery. It relies on rolling contact between the main elements to support the rotating parts. Roller bearings are now mostly standardized. Roller bearings have the advantages of small torque required for starting, high rotation accuracy, and convenient selection. Temperature: 150~250 degrees. Under the premise of maintaining high hardness and high wear resistance, internal stress and brittleness can be reduced to avoid cracking or premature failure during use. Hardness HRC: 58~~64

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