METHOD FOR MANUFACTURING PARTS OF COMPLEX SHAPE BY HYBRID CASTING-ADDITIVE METHOD

摘要

FIELD: mechanical engineering. ;SUBSTANCE: method relates to mechanical engineering and engine construction and can be used for the manufacture of parts of complex spatial shape from hard-to-process metals and alloys. A method for manufacturing parts of complex shape by a hybrid casting-additive method, including selective laser surfacing using heat-resistant nickel powders, according to the invention is characterized by the fact that initially the linear dimensions of the workpiece of the part are set with an allowance for the value of its thermal deformation, then the workpiece of the part is made by selective powder laser surfacing using a control program, a shell blank with green powder inside is obtained, which is covered with a layer of gasified material by dipping into a bath with a coating thickness exceeding the value of thermal deformation, the coated workpiece is processed after cooling on a high-precision machine with numerical control to the size and required surface roughness of the finished part, the resulting workpiece is covered with a heat-resistant ceramic suspension 6-8 mm thick by dipping 8-9 times into the bath, the suspension layer is dried by an air-ammonia method at a temperature of 20-25°C at a humidity of 60-70%, then the blank with a ceramic coating is calcined at a temperature of 950-1000°C for at least 4 hours, after which the blank in a ceramic form is placed in an induction melting complex, the green powder is melted at a temperature of 1200-1440°C for at least 4 hours, a part with the specified dimensions is obtained, which is cooled in air for 3-4 hours and freed from the ceramic coating. ;EFFECT: invention achieves ensuring accuracy and quality of the obtained parts of a complex spatial shape made of heat-resistant materials, reducing production costs during manufacturing. ;1 cl, 3 dwg