A pick used for drilling into sand and gravel soil layer and its preparation method

Abstract

The invention provides a pick for drilling into sandy soil layers and a preparation method thereof. The pick includes a cemented carbide head and a substrate, and a nickel-based self-fluxing alloy coating is prepared on the surface of the substrate. The surface of the substrate under the alloy coating is prepared with at least one of the stripe texture types including cross stripes, horizontal stripes and vertical stripes, the middle part of the alloy coating is raised, and the surface layer of the alloy coating contains solid lubricant. The invention specially designs the pick from the perspectives of substrate surface structure, coating structure and lubricant introduction. The preparation process is simple, and it has excellent wear resistance and toughness. It is suitable for drilling in sandy soil layers with relatively low hardness. A longer service life of the pick can be achieved.

Description

technical field [0001] The invention relates to a geological drilling equipment tool and a preparation method thereof, in particular to a pick used for drilling into sandy soil layers and a preparation method thereof. Background technique [0002] Picks are widely used in geological drilling tools. The pick generally includes two parts of a hard alloy head and a matrix. The cemented carbide head is used to break the rock and soil layer, and the role of the matrix is ​​to fix the cemented carbide head. During the drilling process, the matrix will cause wear due to contact and friction with the rock and soil layer. The matrix usually adopts quenched and tempered 42CrMo and other materials with good toughness. In order to ensure that the cemented carbide head is always fixed in the matrix, the wear problem of the matrix must be solved. When drilling in hard rock formations, high-grade cemented carbide heads are usually selected, and the surface of the substrate should also be...

AI Technical Summary

Problems solved by technology

Although the theory of tribology has proved that lubrication has a better effect on reducing wear, surfacing welding is often limited by the electrode material and electrode size, and it is difficult to control cost and process, so it is difficult to introduce lubrication

On the other hand, when surfacing electrodes, there will be gullies and undulations between adjacent electrodes, and then the contact area between the electrodes and the sand layer will increase, which is prone to abrasive wear, and the high roughness surface of the electrodes will also interact with the The sandstone in the sandstone coating increases the friction, causing partial wear to a certain extent, and there may also be abnormal and Unfavorable phenomena, and even cracking or peeling of the weld layer may occur, which is not conducive to the effective drilling of the pick

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