It has always been believed that drilling must be carried out at a lower feed rate and cutting speed. This view was once correct under the processing conditions of ordinary drills. Today, with the advent of carbide drills, the concept of drilling has also changed. In fact, by correctly selecting the right carbide drill bit, drilling productivity can be greatly improved, and the cost of processing per hole can be reduced.
Basic types of carbide drills
Cemented carbide drills are divided into four basic types: solid carbide drills, cemented carbide indexable insert drills, welded cemented carbide drills and replaceable cemented carbide crown drills.
1. Solid carbide drills:
Solid carbide drills are suitable for use in advanced machining centers. This kind of drill is made of fine-grained cemented carbide material. In order to prolong the service life, it has also been coated. The specially designed geometric edge shape enables the drill to have a self-centering function and has good chipping when drilling most workpiece materials. Control and chip removal performance. The self-centering function and strictly controlled manufacturing accuracy of the drill can ensure the drilling quality of the hole, and no subsequent finishing is required after drilling.
2. Carbide indexable insert drill bit:
The drill bit with cemented carbide indexable insert has a wide processing aperture range, and the processing depth ranges from 2D to 5D (D is the aperture), which can be applied to lathes and other rotary processing machine tools.
3. Welded cemented carbide drill bit:
Welded cemented carbide drill bit is made by firmly welding a cemented carbide tooth crown on a steel drill body. This kind of drill bit adopts self-centering geometric edge type with low cutting force. It can achieve good chip control for most workpiece materials. The processed hole has good surface finish, high dimensional accuracy and positioning accuracy, and there is no need for follow-up precision. Processing. The drill bit adopts internal cooling method and can be used in machining centers, CNC lathes or other high rigidity, high speed machine tools.
4. Replaceable carbide crown bit:
Replaceable carbide crown bit is a new generation of drilling tools developed in recent years. It is composed of a steel drill body and a replaceable solid carbide crown. Compared with welded carbide drills, its machining accuracy is comparable, but because the crown can be replaced, the processing cost can be reduced. Improve drilling productivity. This kind of drill can obtain precise aperture size increment and has a self-centering function, so the aperture machining accuracy is very high.
Post time: Aug-12-2021