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US 2026/0063006 A1Published application
End piece of drill pipe, drill pipe assembly and method
AssigneeSandvik Mining and Construction Tools AB
InventorsVitthal CHAVAN, Yagiz AZIZOGLU
Life of this patent
Estimating the term…
Abstract
An end piece, a drill pipe assembly and method is provided. The drill pipe assembly is for rotary drilling and DTH drilling and includes a drill pipe provided with end pieces at its opposite ends. For the mounting of the end pieces a shrink fit and welding is implemented. For improving the shrink fit, the contact surfaces between the components are tapered.
Claims12
An end piece of a drill pipe for a rotary or DTH drilling rig, the end piece comprising:
- an elongated tubular piece:
- having an outer surface and an inner surface;
- a first end provided with a first coupling means including threaded surfaces arranged for thread mounting with other drill components;
- and
- an opposite second end provided with second coupling means arranged for coupling the end piece to the drill pipe by means of a shrink fit, wherein the second coupling means include a radial outwardly facing first contact surface extending a first axial distance from the second end towards the first end, and wherein the first contact surface has a tapered configuration.
2 more elements
A method of forming a drill pipe assembly to be used in a rock drilling rig, wherein the method comprises:
- mounting end pieces to opposite ends of a tubular drill pipe;
- providing first ends of the end pieces with first coupling means comprising thread surfaces for thread mounting;
- providing opposite second ends of the end pieces with truncated cones wherein radial outer surfaces of the truncated cones form first contact surfaces;
- forming socket parts to both ends of the drill pipe for receiving the truncated cones and being provided with second contact surfaces;
- heating the ends of the drill pipe at the socket parts to expand diameters of the second contact surfaces by means of thermal expansion;
- pushing the truncated cones inside the thermally expanded socket parts;
- allowing the heated socket parts to cool and shrink whereby shrink fits are formed between the first and second contact surfaces;
- securing the mountings between the drill pipe and the end pieces by welding;
- and
- providing the mating first and second connecting surfaces with tapered shapes.
7 more elements
Dependencies are inferred from the claim text.