Method for producing preform for rolling bearing

In the present invention, a preform for a rolling bearing is produced by forging a steel material, which is formed of a high-carbon chromium bearing steel that contains 0.7-1.2 mass % of carbon and 0.8-1.8 mass % of chromium, into a prescribed shape while heating the steel material at a forging temp...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KASHIWAGI SHINICHIROU, NEISHI YUTAKA, YANO TAKEFUMI, SAITOU TOSHIKAZU, UEKITA HIROKI, HIRANO TETSUROU
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ALLOYS BEARINGS BLASTING CHEMISTRY ELEMENTS OR CRANKSHAFT MECHANISMS ENGINEERING ELEMENTS AND UNITS FERROUS OR NON-FERROUS ALLOYS FLEXIBLE SHAFTS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES,RIVETS, BOLTS OR WHEELS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL ENGINEERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PUNCHING METAL ROTARY BODIES OTHER THAN GEARING ELEMENTS SHAFTS THERMAL INSULATION IN GENERAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS
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Beschreibung
Zusammenfassung:	In the present invention, a preform for a rolling bearing is produced by forging a steel material, which is formed of a high-carbon chromium bearing steel that contains 0.7-1.2 mass % of carbon and 0.8-1.8 mass % of chromium, into a prescribed shape while heating the steel material at a forging temperature that falls within the range of (Ae1 point +25 C) to (Ae1 point +105 C), cooling the steel material to a temperature that is not higher than the Ae1 point, heating the obtained forged steel material at a soaking temperature that falls within the range of (Ae1 point +25 C) to (Ae1 point +85 C), holding the forged steel material at this temperature for a period of 0.5 hours or longer, and then annealing by cooling the forged steel material to a temperature of 700 DEG C or lower at a cooling rate of 0.30 C/s or less. 本发明采用如下的方法制造滚动轴承的粗型材：对于由含有0.7～1.2质量％的碳、0.8～1.8质量％的铬的高碳铬轴承钢构成的钢材，边加热至(Ae点+25℃)～(Ae点+105℃)的范围内的锻造温度边锻造成规定形状，然后冷却至Ae点以下的温度，进而将所得到的锻件加热至(Ae点+25℃)～(Ae点+85℃)的范围内的均热温度，并保持0.5小时以上，然后以0.30℃/s以下的冷却速度冷却至700℃以