In terms of parts processing, the proportion of hole processing is still very high, and the development trend of high-efficiency and high-precision hole machining has also attracted much attention. Recently, due to the rapid development of hole processing technology and products, the use of coated carbide tools such as coated carbide drills and reamers has increased significantly.

The shape of the cutting edge of the coated carbide drill has been optimized to improve its processing properties. For example, in the apex angle of the drill bit, the grinding of the chisel edge, and the use of a straight shank (same diameter as the end mill shank) have been thoroughly considered.

The use of reamer for hole finishing, threaded end mill for threaded hole machining, etc., also towards the development of processing speed and precision, so that tool products and processing methods are diversified.

This article will introduce the latest developments in hole processing technology.

High speed, high precision drilling

In the past, the drilling process mainly used high-speed steel drill bits, and the drilling technology has not changed much.

However, with the increasing use of coated carbide drills, there has been a trend of high-speed drilling and high-precision drilling, and technologies such as dry cutting and semi-dry cutting have been introduced in consideration of environmental protection requirements. The new development of hole processing is mainly as follows: 1 coated carbide drill can be processed at a cutting speed of more than 60m/min, realizing a high-speed drilling that can process one hole in an average of only a few seconds; Drilling high-hardness steel drill bit, making high-hardness steel with drilling about 60HRC become a reality; 3 dry and semi-dry drilling deep hole with depth of about 20 times of drill bit has been processed; 4 drill bit The R-shaped design of the outer cutting edge can effectively prevent burrs from being generated at the exit and entrance of the hole, and can improve the surface roughness of the inner wall of the hole.

The shape of the cutting edge of the drill increases the third flank of the planar shape, making the chisel portion thin, reducing the axial force during drilling.

Although the goal of reducing the cutting force on the cutting edge portion is consistent, the shape of the cutting edge of different manufacturers has its own characteristics, showing a diversified trend.

On the other hand, for the case of less drilling such as mold parts, the pursuit of reasonable hole machining, in addition to the use of special tools for hole machining such as drills, also used end mills, according to spiral or ring The cutting method is used for milling, which reduces the number of tools required to machine different sizes of holes.

Micro hole cutting technology with increasing attention

In the fields of electronics (including digital home appliances, digital cameras and other related fields), medicine, etc., for many products that are expected to be developed worldwide, it is required to achieve high precision and high precision in micro-hole processing on their micro-structures. effectiveness. Recently, a small high-speed machining center capable of high-speed and high-precision machining of micro-holes has appeared, and the trend of miniaturization of drill bits has been intensified.

On the other hand, micro-hole processing technology has been involved in the fields of cutting, discharging, laser, electron beam, and stamping, so it is necessary to select the most appropriate processing method. Among these processing methods, the processing method that can be well adapted to changes in the number of products, the hole processing mode, and the machining accuracy is still cutting, and now it is also the most widely used.

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