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试验用钢和试验方法一、钢材: 根据锥柄钻头的服役条件,要求钻头具有足够的红硬性和足够的机械性能。钼系高速钢起源于德国,用18-4-1钢。随着工业的发展,大量的钼系高速钢钻头可用于生产,但这类钢比18-4-1钢的过热倾向大。二、试验方法: 1.φ13.5锥柄钻头和冲击、扭转试棒的热处理工艺:820～850℃予热,予热时间为淬火加热时间的两倍,然后按表2方案加热;从中选择较合适的温度和时间。分级加热温度600℃保温1分钟。560℃回火保温60分钟,回火三次。2.切削试验:被切削材料为45钢,厚20毫米,硬度HB190～200。钻床切削速度35米/分,进刀量0.28毫米/转,转速825转/分。用5%(重量百分比)
Test steel and test methods First, the steel: According to the taper shank drill service conditions require drill bit has sufficient red hardness and sufficient mechanical properties. Molybdenum-based high-speed steel originated in Germany, with 18-4-1 steel. With the development of industry, a large number of high-speed molybdenum steel drill bit can be used for production, but this type of steel than the 18-4-1 steel overheating tendency. Second, the test method: 1.φ13.5 taper shank drill and impact, torsion test bar heat treatment process: 820 ~ 850 ℃ preheating, preheating time for the quenching time twice, then table 2 program heating; choose from More suitable temperature and time. Grading heating temperature 600 ℃ insulation 1 minute. Tempering at 560 ℃ for 60 minutes, tempering three times. 2. Cutting test: the material being cut 45 steel, 20 mm thick, hardness HB190 ~ 200. Drilling speed of 35 m / min, the amount of feed 0.28 mm / rev, speed 825 rev / min. With 5% (by weight)