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我厂生产一种材料为40铬镍钼的零件形状如图1所示。调质处理后材料的机械性能是: 极限强度σ_6=110公斤/毫米~2;延伸率δ=12%;断面收缩率Ψ=55%;硬度H_B=290～331。零件上有较深的孔,要求尺寸精度达φ25~(+0.28),表面光洁度达▽▽▽7。以前采用高速钢铰刀加工,存在着以下缺点:1.为了使刀齿有足够的强度和切削时保持平稳,铰刀刀齿多、容屑槽小(见图2)。由于零件材料韧性大,切屑呈带状,又因孔深、余量大(t=0.5),排屑就困难,容易把已加工表面挤
I plant a material for the 40 chrome nickel molybdenum parts shape shown in Figure 1. The mechanical properties of quenched and tempered materials are: ultimate strength σ_6 = 110 kg / mm2; elongation δ = 12%; reduction in area Ψ = 55%; hardness H_B = 290 to 331. Parts have deeper holes, requiring dimensional accuracy of φ25 ~ (+0.28), surface finish of ▽ ▽ ▽ 7. In the past, the use of high-speed steel reamers, there are the following disadvantages: 1. In order to make the teeth have enough strength and cutting remain stable, Reamer number of teeth, chip small groove (see Figure 2). As part of the material toughness, the ribbon was banded, but also because of the deep hole, the remaining large (t = 0.5), chip removal difficult, easy to squeeze the processed surface