The drill rod should undergo annealing treatment before use.
The surface finish of the drill rod should reach Ra0.8 μ m。
The straightness tolerance of the drill rod should be within 0.2mm/m.
The length error of the drill rod shall not exceed 1mm, and the total length curvature shall not exceed 0.2mm/m.
The inner diameter tolerance of the drill rod should be within 0.1mm, and the surface roughness should be Ra0.4.
The hardness of the drill rod should be above HRC60.
The bending degree of the drill rod per meter shall not exceed 0.4mm, and the joint offset shall not exceed 0.1mm.
The tensile strength of the joint shall not be less than 100N/mm2, and the residual elongation shall not be less than 1%.
The surface of the drill rod should be free of oxidation, corrosion, burrs, and cracks.
The maintenance method of the drill rod: remove the surface oxide layer, wipe it clean and apply medium speed light wax, slowly screw in the tap, keep it coaxial, and then idle the tap for 2-3 minutes. At the same time, prevent swinging, sliding, and jamming, avoid collision with the grinding tool, ensure normal lubrication and easy operation, and strictly prohibit falling or being impacted.