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本文介绍的麻花钻有两大优点:免除去毛刺的工序和具有自行定心的性能。还有钻削速度较高和寿命较长等优点。Gidding & Lewis-Bickford Machine 公司发展了一种综合螺旋钻尖和Racon 钻尖两者优点的新型钻尖。这种称作Bickford 钻尖的主要进步在于钻尖的工艺上。其主要优点包括:具有自行定心的性能和免除了去毛刺工序、也能采用较快的钻削速度和获得较长的刀具寿命。钻削问题金属切削工业中的大量因素导致发展了这种新型钻尖。这些因素包括:要求提高钻削生产率、延长刀具寿命、数控加工的广泛采用和提高现代化自动钻尖磨床的性能。由于螺旋钻尖和Racon 钻尖已能较好地满足上述要求,所以在许多钻削工序中已取代了普通钻尖。普通钻尖的直线横刃不能起到定心作用,因此常要求先使用中心钻。此外,普通钻头常常会在钻穿时产生毛刺。螺旋钻尖螺旋钻尖的S 形横刃起到修光和定心作用。此种钻尖钻出的孔径与钻头的直径极为接近,甚至常能免除或
Twist drill introduced in this article has two major advantages: to remove the deburring process and have self-centering performance. There are high drilling speed and longer life and other advantages. Gidding & Lewis-Bickford Machine Corporation has developed a new type of drill tip that combines the best of both auger and Racon tips. This major improvement, called the Bickford tip, is the technique of the tip. Its main advantages include: self-centering performance and eliminating deburring processes, faster drilling speeds and longer tool life. Drilling Problems A number of factors in the metal cutting industry led to the development of this new type of drill tip. These include: Increasing drilling productivity, extending tool life, widespread adoption of CNC machining, and improving the performance of modern automated tip grinding machines. As the auger tip and Racon tip have been able to meet the above requirements, they have replaced the normal drill tip in many drilling operations. Ordinary drill tip linear chisel can not play the role of centering, so often require the use of center drill. In addition, common drills often produce burrs when drilling. S-shaped chisel edge of auger tip Helix and centering. The diameter of such a drill tip is very close to the diameter of the drill bit and can often be eliminated or eliminated