A rock drill shank adapter, also known as a drilling tool adapter or drill rod adapter, is a component used in rock drilling equipment to connect the rock drill bit or hammer to the drill rod. It serves as an intermediary piece that facilitates the transmission of impact energy from the drilling equipment to the rock surface.
Whether it is in the selection of materials or the production process, we are all to improve the service life of the Hex Shank Adapter.
During rock drilling operations, the Hex Shank Adapter, which is the last section of the drill tool, will inevitably experience a bending moment. Additionally, a tensile stress wave will be generated inside the Hex Shank Adapter as a result of the shock compression wave's reflection at the free end and the change in section. Impact corrosion fatigue fracture of the Hex Shank Adapter is brought on by the alternating action of impact compression and tensile stress, as well as the corrosion of mineral water. The primary issue impacting the shank's service life is the shank adapter fracture, thus we may start by increasing the impact fatigue strength at the shank adapter's notch. The next two actions can be taken.
Ensure the sealing ring groove's circular arc transition and the thread portion's recess have been machined to a high standard.
The sealing ring groove of the inner hole and the recess of the threaded part are where the Hex Shank Adapter fractures most frequently. The poor machining quality of the arc transition is the primary cause of the issues in these two pieces. Therefore, the machining quality of these delicate components should be properly confirmed first to increase the shank adapter's resistance to impact fatigue fracture.
The high-grade impact bending fatigue strength of the Hex Shank Adapter material is guaranteed by an effective carburizing heat treatment technique.
The Hex Shank Adapter's fatigue resistance can be increased during machining by guaranteeing the quality of the arc transition and lowering the stress concentration. Localized stress concentration is unavoidable nonetheless. Because of this, learning how to increase the material's inherent notch impact bending fatigue strength becomes crucial for enhancing the Hex Shank Adapter's fatigue resistance.
Of course, improving the service life of the Hex Shank Adapter is not only solved from the failure mode of Hex Shank Adapter fracture but there are other forms of shank adapter failure. To extend the service life of the Hex Shank Adapter, it is also crucial to recognize and address these failure mechanisms.
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Type: Atlas Copco, Epiroc, Furukawa, Ingersoll, Montabert, Sandvik-Tamrock
