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 Wysłany: Pon 11:52, 10 Sty 2011 Temat postu: ugg italia Composite centrifugal casting of high s |
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Composite centrifugal casting of high speed steel roll ring
Thermal treatment process is 830 ~ 880C × 3 ~ 4h, furnace cooling to 720 ~ 760C. Insulation 2 ~ 4h,[link widoczny dla zalogowanych], oven-ling to 500C, cooled baked. Hardness after annealing roll collar 22O ~ 250 (H】 j). Has good machining properties. Because of high speed steel contains more alloying elements, the quenching temperature is usually above the l150C, high speed steel composite roll ring, if used more than l150c quenching temperature, the inner ball of iron organization will be significantly coarsening affect the safety of composite roll ring use. Therefore, high speed steel composite roll ring frequency induction hardened by heating the surface hardening process, carried out in the vertical quenching machine, in order to make heating and cooling uniformity, roll ring to l5 ~ 25r/rain speed of rotation, speed sensor is 1. O ~ 2.0mm / s. The jurisdiction of a large ring contact stress at work. If the rational distribution of residual stress. Can improve the contact roller ring fatigue strength and service life. Preheat quenching can improve the residual stress distribution. Preheating before quenching induced by preheating. Experiments show. Department of preheating temperature increased heart, not only the hardened layer of residual compressive stress increases. At the same time so that the magnitude of tensile stress in the transition zone greatly reduced. Help to improve the service life of roll ring. Quenching to stabilize the organization and eliminate stress. To be carried out after quenching and tempering roll ring, tempering furnace in the box resistance to 45kW. Tempering process is: 52O ~ 560c × 3 ~ 4h × 2 times. 3 high speed steel composite roll rings performance and application of ultrasonic flaw detection using high-speed steel composite inner and outer layers of the composite effect of roll, the results show that the composite roll ring with inner and outer well, with no stratification layer,[link widoczny dla zalogowanych], slag, porosity and other casting defects . Roll ring also tested the surface hardness, the results shown in Table 2, also with the high chromium cast iron roll collar hardness are compared. Shows the hardness of high speed steel roll ring ring than the high rollers of high chromium cast iron,[link widoczny dla zalogowanych], hardness uniformity is better than high-chromium cast iron roll ring. Also working with the roll ring and the same with the heat treatment furnace casting Y-test block, and with the cutting machine processed 10mm × 10miD. × 55mm samples tested toughness,[link widoczny dla zalogowanych], high-speed steel roll ring shows the impact toughness of high chromium cast iron roll ring is more than 2 times. Table 2 The mechanical properties of roller ring complex sets of high speed steel 64365564g63965.064I64g16116.8 contrast Table2Comparativemechanicalpropertiesforrollcollar 61.059262860.7613610787.0574 high-speed steel high chrome cast iron composite roll rings of wire rod mill in a steel rack on the middle of the industrial test results show that , high speed steel composite roll ring safe and reliable service life than high chrome cast iron roll ring more than 5 times. High-speed steel composite roll ring. Can significantly improve the rate of mill operations, reduce labor intensity and improve the quality of roll surface of the material. Significant economic benefits, it is widely used. 4 Conclusion (1) with high-speed steel for the outer layer of iron alloys for the inner layer, using centrifugal casting method to produce complex high-speed steel composite roll ring,[link widoczny dla zalogowanych], the inner and outer layers are linked closely together, with no stratification layer, slag, porosity and other casting defects appear. (2) high-speed steel by the RE-Mg-Ti compound modification treatment. Dense, eutectic carbide was refined. And isolation was broken mesh-like distribution. (3) high-speed steel composite roll ring by induction heat treatment, the outer layer significantly increased the hardness, has little influence on the inner layer. (4) high-speed steel composite roll ring safe and reliable for industrial production, service life than high chrome cast iron roll ring more than 5 times. Can significantly improve the rate of mill operations, reduce labor intensity, with good economic efficiency. References 1 Fu Zhang light. Jin-Hai Liu, Yin Tiger ashamed of foreign high-speed steel roll Recovering progress of the study. Casting, 1990 (2) 44 ~ 472IchlnoK · KataokaY, KosekiT. DevelopmentofCentrifugalCastRollwithHighWearResisfarceforFinishingStands0fHotStripMiIlK ... sa \Editor: Liu Wei) 33
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