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我厂在加工φ45塑料挤出机螺杆的φ14.5×1250mm通孔(见图1)时,原来采用接长麻花钻从两端钻入接通,两端钻孔的偏差达1～5mm。现采用φ14.5mm深孔钻能一次钻通,孔的直线度以及对外圆的同轴度都能满足工艺要求。全长走偏量(实测10件)最大为0.25mm,两者的效果对比如下表所示。一、φ14.5mm深孔钻几何参数 (1)深孔钻结构(见图2)。φ14.5mm深孔钻采用单刃内排屑BTA结构。切削刃磨成折线状,使切屑分成三条宽度各为3mm左右的小切屑,能顺利排屑。
I plant processing φ45 plastic extruder screw φ14.5 × 1250mm through-hole (see Figure 1), the original use of long twist drilled drill from both ends connected to both ends of the hole deviation of 1 ~ 5mm. Now using φ14.5mm deep hole drilling can be a drilling, hole straightness and the coaxiality of the outer circle to meet the technical requirements. The total amount of deviation (measured 10) 0.25mm, the effect of the two contrast as shown in the table below. A, φ14.5mm deep hole geometry parameters (1) deep hole drilling structure (see Figure 2). φ14.5mm deep hole drilling using single-blade chip BTA structure. Cutting edge grinding into a polygonal line, so that the chip is divided into three widths of about 3mm each of the small chip, can successfully chip.