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图中所示为沟形经过改进的钻头。据西德一家公司报导,这种钻头的性能比直径在13毫米以下的普通沟形钻头要好。据称,用这种钻头加工出的孔。精度较高,钻头的刚性亦较好,由于钻沟的容屑空间大,允许一次钻到与沟长相等的深度。勿需退出钻头进行切屑的清理。这种由整体磨制而成的钻头,整个长度上的钻心厚度不变,螺旋角为40°,刃带比普通钻头窄,钻头角为118°。
The figure shows a modified drill bit. According to a West German company, the performance of this bit is better than a normal grooved bit with a diameter of 13 mm or less. Allegedly, with this drill bit hole. High precision, bit rigidity is also better, due to the drilling ditches of the chip space, allowing a drill to a depth equal to the groove length. Do not need to exit the drill bit for chip cleaning. The drill bit, which is made from a single piece of material, has a constant thickness over the entire length with a helix angle of 40 °. The land strip is narrower than an ordinary drill and has a drill bit angle of 118 °.