Steel Tooth Roller Cone Drill Bit Tooth Surface To Strengthen The Material And Strengthening Process

The material used to strengthen the surface of steel tooth roller cone bit is main the grain found hard alloy, few diamdnd is used. The joint intension of diamond with base object is too low and the graphitization of diamond happens in the course of welding ,which deduces that manufacture technics of diamond adopts the technology of applying and the low fusion point braze or powder metallurgy sinter.The hard alloy ablates so seriouely that wear resisting does not develop .In this disquisition,aimed at the environment, many test and theoretics analysis is made on the samples which make of 20Ni4Mo that is used to make body of the steel tooth roller cone bit. The main characteristics of the reseach in this disquisition are as follows:1. The high grade artificial diamond with the lowest magnetism is picked up to strengthen the surface of steel tooth roller cone bit; Milled the research of beforehand treatment of the alloy on diamond welding; the heating method and the technology of the diamond surface metallization; research on heat insulator of diamond welding.2. The optimization of sphericity hard alloy which wear resisting is better than granulate hard alloy; with appropriate heat insulator and developing repair welding welding rod, no burning loss repair welding of the sphericity hard alloy is turned into reality.3. Adopted O2C2H2 repair welding technology that may control welding aura and the cost is low, high temperture welding of diamond or hard alloy is turned into reality.4. Composite welding technology with diamond and sphericity hard alloy makes the excellent compositive capability of diamond and sphericity hard alloy bring into uses.5. Through a great deal of metallograph and SEM and all kinds of property tests, it is testiyied that the joint of the diamond, hard alloy welding alloy and base steel is metallurgical so that it is steadly enough.6. The graphitization and the changes of capability of diamond and the ablation of hard alloy is availably avoided at the welding temperature.The research on the salt bath infiltered titanium, metallization in vacuum of diamind, heat insulator of welding and composite welding technology is the innovation in this disquisition. The key technology of welding hard alloy and diamond is found out. Composite welding technology makes use of the excellent compositive capability of two kinds of super-hard material and an effective new way to strengthen the surface of the steel tooth roller cone bit is set up.