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粗车工件如前,使用同样车床。刀具材料与热处理切削部份的材料是高速钢。为节省材料起见,这种高速钢制成刀片25×20×15公厘,焊在刀桿上。刀桿材料是st 70.11,如〔图十二〕所示。高速钢的化学成份为: 炭…0.7％,铸...18.5％,铬…4.0％, 钼…0.8％,钴…10％,钒…1.35％。刀桿连同悍在它上面的刀片,放在炉中加热到1200°至1250℃,并在油中或用压缩空气淬火。随后的配火在大约590℃的盐池中进行。刀具的切削角度与形状如[图十二]所示。这样的刀具如要保持60分钟的寿命,切削时发生的温度不容许超过540℃。这种高温,比之使用炭素工具钢刀具,容许有显著提高的经济切削速度。在这方向所进行的寿命试验,是以磨耗宽度B=1.0公
Rough workpiece as before, using the same lathe. Cutting tool materials and heat treatment of the material is high-speed steel. To save material, this high-speed steel blade made of 25 × 20 × 15 mm, welded to the arbor. Tool bar material is st 70.11, as shown in Figure twelve. The chemical composition of high-speed steel is: 0.7% of carbon, 18.5% of cast, 4.0% of chromium, 0.8% of molybdenum, 10% of cobalt, and 1.35% of vanadium. Arbor together with a blade on top of it is heated in a furnace to 1200 ° to 1250 ° C and quenched in oil or compressed air. Subsequent fires were performed in a salt pond at about 590 ° C. Cutting angle and shape of the tool is shown in [Figure 12]. Such a tool to maintain 60 minutes of life, cutting temperature does not allow more than 540 ℃. This high temperature, compared to the use of carbon tool steel cutting tools, allows a significant increase in economic cutting speed. The life test carried out in this direction is based on the wear width B = 1.0