BTA brazed carbide type D16-D65mm

Before the 1960s, deep hole processing technology was mainly used in national defense and military production. Since the 1980s, with the continuous advancement of science and technology and the continuous development of processing and manufacturing, the application of deep hole processing technology has become more and more extensive. Almost all processing and manufacturing industries have been popularized. However, advanced deep hole processing tools have been monopolized by foreign countries.

In order to overcome this technical difficulty, Chuangheng has been trying and improving for many years, striving to create high-quality deep hole drills. BTA deep hole drill is a drill specially used for processing deep holes that we have successfully developed through years of hard work. The length-to-diameter ratio reaches 50 times the diameter. It is mainly used in mechanical processing and manufacturing, such as petrochemical, boiler vessels, and nuclear power tube sheets. And other fields, and stainless steel tube sheet is the representative of difficult processing in the field of tube sheet, today I will share with you a processing case of stainless steel tube sheet.

Difficulties in deep hole processing

01Deep hole drilling tool has a slender shank, poor rigidity, difficult chip removal, and high requirements for chip forming.

02Since the tool cuts inside the hole, cutting conditions and tool wear cannot be observed.

03When drilling, the drill bit is prone to "deviation", resulting in the axis of the drilled hole being skewed or the diameter of the hole being enlarged or not rounded.

1. Structure introduction

BTA deep hole drill, it is a typical structure of internal chip removal deep hole drill, it is improved on the basis of single edge internal chip removal deep hole drill, it is composed of cutter body and blade, the thread on the shank of the cutter body and the The positioning diameter is responsible for connecting and fixing the tool holder, and the cutting blade and guide block at the tool body are responsible for cutting and guiding.

2. The principle of chip removal

KBD BTA deep hole drilling adopts the method of hydraulic internal chip removal. Its cutting edge is double-sided staggered teeth. The chips are cut from both sides. With the assistance of high-pressure cooling oil, they enter the drill pipe through the double-sided chip removal channel and are discharged. Outside the hole, it reduces the difficulty of chip removal and improves the drilling stability of the tool.


1. Continuous drilling, no need to retract the tool midway to remove chips, improving production efficiency.

2. The pore size is stable, and the general pore forming precision is H9 level.

3. The hole wall roughness of standard steel can reach Ra3.2-1.6, and that of non-ferrous metal can reach Ra1.6-0.4.

4. Good shape tolerance, hole roundness and axis parallelism

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