The secrets to efficient drilling often lie in the details!

DTH drill bits, with their superior efficiency and reliability, play an indispensable role in mining, quarrying, and water conservancy projects. However, to maximize the potential of DTH drill bits, choosing the right head design is crucial. There are three main types of head designs for DTH drill bits: concave, flat face, and convex.

1. Flat Face Design

The flat face DTH drill bit has a smooth, continuous end surface. Due to its simple design, it is the most durable type of DTH bit and is considered a universal bit that can be used under all rock conditions. It is best suited for fractured or very hard, as well as highly abrasive rock formations. However, due to its flat head, compared to the concave DTH drill bits, its drilling speed and hole straightness are lower. Thus, this drill bit is also suitable for drilling holes where high straightness is not required in medium-hard and soft rocks.

Typical rock types: Granite, Hard Limestone, Basalt

2.  Concave Design

The concave face drill bit features a slight conical depression on its end face. The conical surface provides good stability and efficient chip removal during drilling, ensuring straightness, particularly in deep hole drilling , it can improve hole alignment as a result of the inverted pilot. It is suitable for medium hard to hard formations, less abrasive, and fractured rock conditions.

Typical rock types: Granite, Basalt

3. Convex Design

The primary purpose of the convex face design of DTH drill bits is to enhance drilling efficiency. Suitable for soft to medium hard rock formations, as well as non-abrasive rock types, this design allows for a good combination of high drilling efficiency and long service life in these rock types.

Typical rock types: Limestone, Hard Limestone, Shale, Granite, Basalt

Each head design of DTH drill bits has its unique advantages and suitable applications. In selecting the appropriate head design, factors such as geological conditions, operational requirements, drill bit materials need to be considered comprehensively. By making scientific and reasonable selections and designs, the efficiency and precision of drilling operations can be significantly improved, reducing operating costs!

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