In recent years, whether at home or abroad, the button bit is developing rapidly because it has more obvious advantages compared to other rock bits. Some technical engineers even believe that the combination of a button bit and a hydraulic rock drilling rig can be regarded as the best support for current rock drilling technology. What exactly is a button bit? What categories does it have? How to choose the button bit? Today we share these with you.
The button bit is made up of a tungsten carbide button inlaid on the drill bit body. Compared with the flake drill bit, the button bit has a free button distribution. According to the drilling hole dia and the rock breaking load, the number and position of the edge and middle button can be reasonably determined, and the drill bit head diameter is not limited. And because it is multi-point crushing, the rock-breaking efficiency is higher. It can not only effectively eliminate the blind area of rock-breaking, but also avoid the repeated crushing of cuttings. In addition, because the abrasion of the alloy column is higher than that of the flake drill bit, its service life is longer and the regrinding workload is small, which shows a higher value under the operating conditions of mechanized rock drilling rigs and deep hole mining. It is precisely because of these advantages of the button bit, that its application in the construction site will be more and more.
According to the connection form of the button bit with the drill rod, it can be divided into three types: taper button bit, threaded button bit, and down-the-hole drill bit.
The tapered button bit is a kind of rock drilling tool which is inlaid with cemented carbide on the drill body and is suitable for the taper of the drill bit body and the drill rod. According to the button fixing process, the products are divided into hot insert process tapered bits and cold pressing process button bits. Products are widely used in mining, tunneling, anchoring engineering, quarrying, and other industries.
The threaded button bit is a kind of rock drilling tool that is connected with the threaded drill rod through the drill bit thread to realize the transmission of the impact power and rotational torque of the rock drill to break the rock. It is often used with the hydraulic drilling rig. It is mainly used in underground mining, open-pit mining, and blast furnace opening in steel mills and other fields.
The DTH drill bit is connected to the DTH impactor through splines. The trousers are made of high-quality alloy steel that has undergone strict heat treatment, which has good hardness, wear resistance, and impacts resistance. The tungsten carbide buttons are installed at the head of the drill bit through cold or hot insert. Usually, this kind of drill bit is used combining with the submersible impactor to drill rock. According to the shape classification, the DTH drill bits can be divided into the flat face, drop center, and semi-dome.
Through the understanding of the button bit, we can initially see that the button bit classified by the connection form is suitable for application scenarios. So, how do we choose the right button bit for different rock formation conditions?
As for there are many classification methods for button bits and we prefer the one that choosing a button bit according to the type of carbide buttons, I will share it with you through the carbide buttons type form.
|Carbide Buttons Type||Application||Advantage||Apply to rock|
|Hemisphere Button||Universal Carbide||Good abrasion resistance||Very suitable for hard rock;
Applicable to corroded strata
|Semi-Ballistic Button||Universal Carbide||Button entry speed is fast||Very suitable for medium hard rock; Suitable for moderately corrosive rock strata|
|Conical Insert||Mostly used for small diameter bit||Button entry speed is fast||Applicable to non-corrosive rock strata|
Notice:Generally, the more edge button, the better overall performance, especially in hard rock conditions.
As we all know, the drill bit is an indispensable tool in the field of rock drilling. When facing drill bit types including button bits, we should choose the drill bit according to the construction situation. Although the button bit is used more and more widely, it is more complicated than other drill bits. Enterprises want to improve economic efficiency and operational efficiency, in addition to choosing the correct drill bit, the most important thing is to choose a supplier that can provide excellent quality product, because the drill bit quality directly affects the construction progress. In addition, when the drill bit is used for some time, it may appear different failures. At this time, do not replace the drill bit immediately. You must judge and deal with the failure state of the drill bit. For this, you can refer to the article “15 kinds of Methods to solve the failure of button bits”. After all, only extending the tool’s service life can bring more benefits to the business.