Manufacturing Requirements for Large Diameter DTH Drill Bits
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Large-diameter drilling is increasingly used in industries and industries, such as construction of water conservancy and hydropower projects, construction pile foundations, machine well engineering, mining, and oil extraction. The insert drill bit realizes low-broken rock formation through pneumatic or hydraulic DTH hammer, and adopts positive circulation or reverse circulation slag discharge. It is widely recognized by the market for its high efficiency and low cost.
The diameter of large-diameter drills is generally greater than 300mm, more 500, 800, 1000mm, and some even range from 1500 to 3000. The depth of large-diameter boreholes varies depending on the application, and the rock formations encountered are also very different, and the requirements are very strict in most cases. The cost of large-diameter deep-hole DTH drills is very expensive. Therefore, preventing early failure and ensuring the service life of the drills are the primary quality control objectives for the production of such drills, and the material selection and heat treatment process are particularly important.
The harsh working environment puts forward extremely high requirements on the hardness, strength, toughness, impact resistance, wear resistance, fatigue resistance, etc. of the drill body. Considering the performance requirements of each part, it can be considered that the material selection of the drill body should meet the following requirements Several requirements:
①The surface hardness is required to be high to enhance the wear resistance, and the toughness of the core is good to enhance the impact resistance. In order to avoid brittle fracture and fatigue fracture, the material must have good fracture toughness, fatigue strength and fracture strength.
②It has high hardenability. In order to meet the different performance requirements of each part of the drill body, it is beneficial to improve the indicated yield strength, improve the fastening force of the tooth hole to the alloy teeth, and also improve the yield strength and toughness of the core.
③It can have certain anti-corrosion ability when encountering Yance gas and liquid downhole.
④ Under a certain high temperature, the structure and hardness of the material are highly stable, and it is not easy to soften and deform.
⑤Good process performance, such as good forging performance, heat treatment performance, etc.
⑥High metallurgical quality, good organizational uniformity and high purity.
