Hollow drill bits, as the name implies, are drill bits without a core, called the name according to the structure of the cutting tool. As a cutting tool, people have used twist drills for more than 100 years. Since the core portion of the twist drill has a completely negative cutting angle and the cutting resistance is large, the cutting force of the twist drill is 50%-60% due to the drill core. Coupled with the steel factor, the twist drill can't be done very much. Machining larger and deeper holes requires step-by-step expansion from the drill hole until the reaming size is reached. The advent of the hollow drill bit expands the cutting range of the drill bit. It can process large holes and deep holes with relatively small power. It can also make the size of the hollow drill bit very large, using only the best or the best on the cutting edge. Steel not only reduces the cost of processing, but also makes it possible to process processes that were previously considered impossible. Henan Blue Sword Tools Technology Co., Ltd. has been working hard to study the technical problems of large hole deep hole processing. It not only designed and developed small-sized high-speed tool steel hollow drill bits and formed a large-scale production capacity on steel structural parts and steel plates. It has played a big role in the railway. In addition, it has also developed large-size high-speed steel and hard alloy hollow drill bits. Some people also call it a nesting bit or a core bit according to the role of the bit. Our technicians started the hollow drill bit from 1985. There were many detours in the middle, and many failures were made. After the forced chipping measures were taken in 1989, the development was successful. Since the equipment of the domestic use unit is not matched, there has been no mass production. In 1998, some units succeeded in copying foreign drilling machines, and we matched them and gradually increased the number of production. In addition to the production of hollow drill bits for use on dedicated drills, large-size hollow drill bits are also used on general-purpose machines, and some are called nesting knives. Small-sized hollow drill bits are generally made of high-speed tool steel, which is roughly in the range of φ16-φ50. The high-speed tool steels we use are M2, M35 and high performance, which are adapted to different cutting environments. Above φ50, we advocate the use of hard alloy materials. There are two types of hard alloys, welded and machine-clamped. We recommend that the large-size hollow drill bits use the carbide machine clamp to index the insert type. It is beneficial to reduce production costs, save raw materials, improve work efficiency, and give full play to the superior cutting performance of cemented carbide inserts. Hollow drill bits have many unique advantages, especially when the drilling size is large and the depth is long, the superior performance can be fully exerted, which can greatly provide work efficiency. This is a common twist drill and The general cutting tools can not replace, large-size carbide machine clamp indexable insert type hollow drill bit will also play a big role in power generation, transmission, boiler and defense construction.
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