Choosing the right drill crown is crucial to the efficiency of the drilling process, and thus to achieving the desired goals. In this article, we will take a closer look at the selection of drill crowns, analyzing different types of rock masses and their properties.

Types of rock masses and their influence on the choice of drill crown

Rock formations are all kinds of rock formations formed as a result of geological processes. There are several basic types of rock masses, which differ in hardness, cohesion, or structure, among other things. Among the most important are sedimentary rock masses (sandstone, limestone), metamorphic rock masses (gneisses, schists) and magmatic rock masses (granites, basalts).

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-The hardness of the rock mass has a significant impact on the choice of drill crown. The harder the rock, the greater the need for a corona with higher wear resistance. For softer rock masses, such as sandstone or limestone, coroners of lower hardness can be used, saving costs. 

- The cohesion of the rock mass also affects the choice of drilling equipment. For rock masses with high cohesion, such as granite or basalt, the coring equipment must have adequate compressive and tensile strength. Otherwise, it may be damaged during drilling. 

- The structure of the rock mass is no less important. Rock formations with complex structures, such as shale or gneiss, require the use of high-precision lace and the ability to traverse a variety of rock layers.

Key parameters of drill crowns worth paying attention to

Drill crowns vary in terms of their material, shape and type of teeth. The material of a drill crown is crucial to its durability and performance. Crowns made of high-speed steel (HSS) work well for drilling in soft rock formations. Carbide crowns, on the other hand, are recommended for drilling in hard rock formations.

The shape of a drill crown affects its ability to traverse a variety of rock layers. Crowns with a conical shape are good for drilling in rock masses with high cohesion. Cylindrical-shaped crowns, on the other hand, are suitable for drilling in rock masses with less cohesion. The type of teeth of a drill crown, in turn, is important for its performance and durability. Rectangular teeth are suitable for drilling in soft rock masses. Trapezoidal teeth, on the other hand, work well for drilling in hard rock.