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在橡皮上钻孔,可采用切削部分具有锯齿形状的特制管状钻头。钻头材料用y8碳素工具钢;外径等于待钻孔的直径;钻头切削部分做成45°的锯齿,齿距等于齿深。钻头的锯齿用圆片角度铣刀铣通,因此,所得到的齿数是偶数。钻头的齿深与齿距(3～5公厘)的选择跟待加工橡皮的厚度及钻头直径有关。当钻头齿数Z=18,直径为φ20公厘时(如图1)、齿距跟齿深根据下式算出。
Drill holes in the rubber, the use of cutting part of the serrated shape of the special tubular drill. Drill material y8 carbon tool steel; diameter equal to the diameter of the hole to be drilled; bit cutting part made of 45 ° serrations, tooth pitch is equal to the tooth depth. The serration of the bit is milled with a disc angle milling cutter, so the resulting number of teeth is even. Drill tooth depth and pitch (3 ~ 5 mm) choice with the thickness of the rubber to be processed and drill diameter. When the drill bit number Z = 18, the diameter of φ20 mm (Figure 1), pitch with the teeth deep according to the following formula.