快速钻的主要特点是加工效率高、无需中心钻打引导孔、可更换刀片、刚性好、特殊应用广泛、表面粗糙度值小、可转位刀具、节省时间和成本。

快速钻也叫U钻，是一种内冷钻头，排削好，效率很高，可以连续钻孔。加工效率一般是麻花钻的2-3倍，可直接在工件上加工，无需中心钻打引导孔。刀体前端装有可更换的刀片，降低了使用的成本。U钻的刚性非常好，可以采用很高的进给率，而且U钻的加工直径要比普通钻头大的多，最大能达到D50-60MM，当然U钻由于装刀片的特性不可能做太小，D10mm以下的U钻少见。U钻还有一些特殊应用，比如倾斜平面钻削，交叉孔系钻削，半孔钻削和偏心孔钻削。具体内容如下                            

1.    U钻可以在倾斜角小于30°的表面上打孔，而无需降低切削参数。U钻的切削参数降低30%后，可实现断续切削，如加工相交孔、相贯孔、相穿孔。

2.    U钻可实现多阶梯孔的钻削，并能镗孔、倒角、偏心钻孔。U钻钻削时钻屑多为短碎屑，并可利用其内冷系统进行安全排屑，无需清理刀具上的切屑，有利于产品的加工连续性，缩短加工时间，提高效率。

3.    在标准长径比条件下，使用U钻打孔时无需退屑。用U钻加工出的孔表面粗糙度值小，公差范围小，可替代部分镗刀的工作。

4.    U钻为可转位刀具，刀片磨损后无需刃磨，更换较为方便，且成本低廉。使用U钻技术不但能减少钻削工具，且因U钻采用的是头部镶硬质合金刀片方式，其切削寿命为普通钻头的十几倍，同时，刀片上有四个切削刃，刀片磨损时可随时更换切削，新的切削节省了大量磨削和更换刀具时间，能平均提高工效6-7倍。

Ba Dao Sharing - The features and advantages of rapid drilling

The main features of rapid drilling are high processing efficiency, no need for center drilling to drill guide holes, replaceable inserts, good rigidity, wide range of special applications, small surface roughness value, indexable tools, and time and cost savings.

The fast drill, also known as the U-drill, is an internally cooled drill bit with good cutting performance and high efficiency, capable of continuous drilling. The processing efficiency is generally 2 to 3 times that of twist drills, and it can be directly processed on the workpiece without the need for a center drill to drill guide holes. The front end of the knife body is equipped with replaceable blades, which reduces the cost of use. The rigidity of U-drills is excellent, allowing for a very high feed rate. Moreover, the processing diameter of U-drills is much larger than that of ordinary drill bits, with the maximum reaching D50-60MM. Of course, due to the characteristic of installing inserts, U-drills cannot be made too small, and U-drills with a diameter of D10mm or less are rare. U-drills also have some special applications, such as inclined plane drilling, cross hole system drilling, half hole drilling and eccentric hole drilling. The specific content is as follows

The U-drill can drill holes on surfaces with an inclination Angle of less than 30° without reducing the cutting parameters. After the cutting parameters of the U-drill are reduced by 30%, intermittent cutting can be achieved, such as processing intersecting holes, intersection holes and phase holes.

2. U-drills can perform multi-step hole drilling and are also capable of boring, chamfering, and eccentric drilling. When a U-drill is in operation, the drill chips are mostly short chips. Its internal cooling system can be used for safe chip removal, eliminating the need to clean the chips on the tool. This is conducive to the continuity of product processing, shortens processing time and improves efficiency.

3. Under the standard length-to-diameter ratio conditions, there is no need for chip removal when using a U-drill to drill holes. The surface roughness value of the holes processed by U-drills is small, and the tolerance range is small, which can replace part of the work of boring tools.

4. U-drills are indexable tools. When the blades wear out, they do not need to be ground, making replacement relatively convenient and cost-effective. The application of U-drill technology not only reduces the number of drilling tools, but also, due to the U-drill's use of a hard alloy insert at the head, its cutting life is several times that of a common drill bit. Moreover, the insert has four cutting edges, and when the insert wears out, the cutting can be replaced at any time. The new cutting saves a lot of grinding and tool replacement time, and can increase work efficiency by an average of 6 to 7 times.

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