Twist drill bits are generally made of high-speed steel for Fried Dough Twists drills; A deep hole drill usually refers to a tool that processes holes with a depth to aperture ratio greater than 6. Commonly used include gun drills, BTA deep hole drills, jet drills, DF deep hole drills, etc; The reaming drill has 3-4 teeth, which are used to expand existing holes and improve machining accuracy and smoothness. Spot facers have a large number of cutting teeth, which are used to process the hole end into the desired shape using the forming method. They are used to process various countersunk head screws' countersunk head holes or to flatten the outer end face of the holes. Drilling is used for drilling holes of shaft workpieces. It is essentially a combination of Fried Dough Twists drills with small spiral angles and spot drills, so it is also called composite drills. The center of the hollow drill rod is a hollow drill bit, mainly used for drilling and coring. Considering the dimensional accuracy requirements of drilling processing, generally speaking, the smaller the processed aperture, the smaller the tolerance. Therefore, it is generally used for hole machining with low precision requirements, or for completing hole precision machining by replacing boring blades. Pay attention to the toughness of the drill bit, which is also a guarantee that some manufacturers can provide. During this process, manufacturers can achieve good results through a series of good material ratios and production processes. Considering the stability of the machining machine tool, which is crucial for the safe service life and drilling accuracy of the drill bit, it is necessary to carefully inspect the working status of the machine tool spindle, fixture, and accessories. In addition, the stability of the drill bit itself should also be considered. For example, overall hard alloy drill bits have good rigidity, thus achieving high machining accuracy. However, the structural stability of hard alloy indexable blade drills is poor and prone to deviation.
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