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我厂有一零件(如图1),材料为30CrMnSi,热处理HRC32～34,孔径7.6+0.016,光洁度▽7,钻孔时的长径比140。我们研究后采取了钻、铰、研磨等工序,加工质量达到图纸要求。钻孔零件先粗车外圆、热处理、半精车外圆,再钻孔,孔径为6.75mm。(1)钻孔:采用单刃外排屑深孔钻(如图2),主切削刃28°, 刃宽1.70mm(略大于1/4钻孔直径); 副切削刃24°,刃宽1.67mm。为了使工件充分冷却用,排屑顺利,在主、副切削刃的另一侧,D/4直径处,需磨出一个5°的台阶。(2)冷却液:采用20号机油80％,柴油20％(气温低时加入少量煤油),供油压力为35kgf/cm~2。提高供油压力,可增强钻杆的刚性,同时排屑也顺利。(3)切削用量:n=900rpm,s=0.01～0.015mm/r。
I plant a part (Figure 1), the material is 30CrMnSi, heat treatment HRC32 ~ 34, aperture 7.6 +0.016, finish ▽ 7, the aspect ratio when drilling 140. After the study, we adopted the drilling, hinge, grinding and other processes, processing quality to meet the requirements of the drawings. Drilling parts first rough outer cylindrical, heat treatment, semi-fine car cylindrical, and then drilling, bore 6.75mm. (1) Drilling: The use of single-blade outer hole deep hole drilling (Figure 2), the main cutting edge 28 °, blade width 1.70mm (slightly larger than 1/4 drilling diameter); Deputy cutting edge 24 °, width 1.67mm. In order to allow the workpiece to be sufficiently cooled, chip evacuation is smooth, with a 5 ° step on the other side of the main and minor cutting edges, D / 4 diameter. (2) Coolant: Use 20% oil 80%, diesel 20% (low temperature when adding a small amount of kerosene), oil pressure 35kgf / cm ~ 2. Raise the oil pressure, can enhance the rigidity of the drill pipe, while the chip is also smooth. (3) Cutting amount: n = 900 rpm, s = 0.01 to 0.015 mm / r.