摘要:
A method and apparatus for treating a cutter ring adapted to be used in tunnel boring operations; forming an initial cutter ring and heat treating the cutter ring prior to a laser client process; applying an alloy to the surface of the cutter ring adjacent to cutting elements by a laser cladding process whereby the cutting elements have insufficient heat transfer from the laser cutting process to reduce their hardness properties.
摘要:
In a rock bit, roller cutter body having plural hard metal inserts; the body is formed of an age-hardenable superalloy having dimensional stability through hardening enabling pre-drilling of the insert-receiving holes prior to hardening the body, and method therefor.
摘要:
THIS APPLICATION IS CONCENTRATED WITH PROCESSES FOR PRODUCING NOVEL STEEL WHICH, IN ITS FINISHED FORM, IS AT LEAST 80% AUSTENITIC AND IN PREFERRED EMBODIMENTS IS SUBSTANTIALLY FULLY AUSTENITIC, BUT YET HAS AT LEAST THE HARDNESS AND STRENGTH OF HIGH CARBON MARTENSITIC STEELS. THE HARDNESS OF THE STEEL PLUS ITS TEMPER-RESISTANCE (DUE TO THE FACT THAT IT IS AUSTENITIC) MAKES IT ESPECIALLY USEFUL FOR MAKING CUTTING EDGES, E.G. KNIVES AND ESPECIALLY RAZOR BLADES HAVING IMPROVED TEMPER-RESISTANCE. THE STEEL IS MADE BY (A) HEATING A STEEL COMPRISING FROM ABOUT 7 TO ABOUT 30% MANGANESE AND ABOUT 0.6 TO ABOUT 1.;% CARBON TO AT LEAST THE AUSTENIZING TEMPERATURE TO MAKE IT FULLY AUSTENITIC AND TO DISSOLVE SUFFICIENT CARBIDES SO AS TO DEPRESS THE "MS" TEMPERATURE SUFFICIENTLY BELOW ROOM TEMPERATURE THAT THE STEEL WILL REMAIN MAINLY IN THE AUSTENITIC FORM, E.G. AT LEAST 80% AUSTENITIC, WHEN IT IS BOTH COOLED, PREFERABLY BY QUENCHING, TO ROOM TEMPERATURE AND SUBSEQUENTLY COLD-WORKED; (B) COLD-WORKING THE STEEL AND (C) THEREAFTER AGE-HARDENING THE STEEL. IN A PREFERRED PROCESS FOR MAKING RAZOR BLADES FROM SUCH STEELS, THE CUTTING EDGE IS FORMED BETWEEN THE COLD-WORKING STEP AND THE AGEING STEP.
摘要:
Spherical graphite cast iron utilized to prepare a lapping tool is manufactured by casting a molten composition into a mold cavity, and by chilling one side of the resulting casting thereby causing unidirectional solidification, the one side being used as the operating surface of the lapping tool. The molten composition consists of 3.0-3.8 wt. % of carbon, 2.0-2.9 wt. % of silicon, 0.3-0.9 wt. % of manganese, less than 0.05 wt. % of phosphorus, less than 0.03 wt. % of sulfur, 0.2-1.0 wt. % of nickel, 0-0.8 wt. % of copper, 0.05-0.5 wt. % of molybdenum, 0.03-0.09 wt. % of magnesium and the balance of iron. The lapping tool made of this casting has a percentage of sphericity of higher than 80%, graphite particle diameter of less than 100 microns, a density of graphite particles of larger than 70/mm.sup.2, and a Vickers hardness of larger than 200.
摘要:
A cone blank for a rotary cone rock bit is forged, rough machined, carburized and heat-treated, followed by the formation of insert holes therein. Inserts are then pressed into the insert holes. The finished cone is subsequently sprayed with hardfacing cladding material in powdered form. The powder is thereafter densified and fused with a laser source to give a hard, erosion-resistant clad layer on the outer surface, including in the immediate vicinity of the inserts.