Some factors drill bits working conditions

PDC drill extremely harsh working conditions , not only in the work under enormous pressure , but also to withstand the impact of alternating composite role of various forces cause friction in the cutting process is intense, as the matrix PDC drill not only to strong mechanical GUSHI carbide saw blades  properties, but also by a good thermal shock resistance and corrosion resistance. Pants body material, precision machining, heat treatment , welding , etc. after grinding becomes very important , which requires pants body material to high quality carbon steel, processed into pants body to make the appropriate heat treatment, ie after quenching low-temperature tempering , the hardness of the surface after the heat-treated pants between 40 ~ 42HRC, tempered martensite .
Separating the main reason underpinning the diamond layer and WC diamond coating layer is less mature and stable technology , poor adhesion of the diamond and the substrate , resulting in premature lapse diamond film was peeled from the WC denture base layer , greatly reducing the life of  GUSHI circular blades the drill bit and cutting . Process measures progress / Substrate Adhesion : purification surface roughening treatment to remove the carbide tool during the manufacturing process inevitably remain in the substrate surface contaminants, adsorption , oxides , to alter the surface of the substrate microstructure ; addition to the lower surface of the adhesion strength of WC particles , to increase the contact area of ​​the reaction gas sources and the substrate , the substrate surface to increase the surface energy , the progress of the diamond substrate on heterogeneous nucleation density , thereby enhancing the film / substrate adhesion. Commonly used methods are: chemical cleaning , mechanical mosaic powder , liquid ultrasonic treatment. PDC thermal residual stress is the main cause of its non- normal failure , reduce internal thermal GUSHI carbide drill bits  residual stresses PDC PDC is progressive performance most effective way , through the use of non-planar gradient transition connection technology and technology that can increase the PCD layer and hard carbide and the contact area of ​​the stress relaxation due to the physical performance parameters of the difference in thermal expansion coefficients of the two materials , the elastic modulus of the resulting concentrate . Only take the form of specific structures and transitional justice to be graded in order to effectively reduce the thermal residual stress PDC , its ability to impact fracture gaining the upper hand , the progress of its yield and lifetime. The internal stress of the diamond powder and titanium powder sintered layer , the DLC film , a tungsten / diamond gradient composition layer method , the film is preferably eliminated due to lattice mismatch with the base plate , the difference in coefficient of thermal expansion caused by : applying an intermediate layer .