The grinding of the inner surface of the nozzle has also been developed from reaming and manual grinding to electrical grinding. Electric grinding has the comprehensive performance of electrochemical machining and mechanical grinding. The tool cathode is made of metal sintered with abrasives (such as copper and graphite). Processing, on the one hand
The tool rotates, on the one hand, the electrolyte passes through the annular gap between the tool and the inner cavity of the part. Cutting efficiency and surface quality can be controlled by adjusting the power supply voltage.
Advanced welding technologies, namely high temperature vacuum brazing and high energy density electron beam welding, are widely used in combustion chamber cartridges, flame tubes, nozzles, fuel pipelines and other components. Resistance welding has been gradually reduced, and argon arc welding has been relegated to auxiliary status.
Diffusion welding is to place multiple layers of plates in the furnace, heat and pressure after positioning, so that the thin sheets (the same material as the laminates) spread to both sides and connect into a whole.
Advanced surface grinding equipment, that is, a single disk surface grinding machine instead of manual or vibration grinding methods, can obtain high finish, accuracy and labor saving, surface roughness '0.100~0.012.
The main characteristics of the surface mechanical grinder are: the grinding disc is driven by the motor through the pulley rotation, there are several circular correction rings on the disc, the parts and the dividing disc are placed in each positive ring, and the counterweight or hydraulic pressure is added to the machined parts. The correction ring is driven by the friction of the grinding disc and rotates around its own axis; On the one hand, the parts rotate with the disk, on the other hand, forming a complex motion trajectory and obtaining a high finish and accuracy:
Other process installation: Although the nozzle parts are small, but the processing surface is many, the shape and position tolerance requirements are high, and the previous multi-hexagonal machining lathe processing. At present, the CNC machining center can better meet the requirements, the tool library capacity is large, and the tool can be automatically changed according to the program, automatically repaired and sharpened, and automatically detected. One loading card can be boring, milling, reaming, tapping, bevel, ring, cone and other processing processes. The error caused by multiple positioning can be reduced, and the tooling can be reduced, eliminating the template, drill clamp and forming tool. In order to meet the nozzle processing, many units at home and abroad have specially designed and manufactured specialized semi-automatic small processing equipment, such as the end grinding of parts, the inner cone grinding, the inlet tangential channel drilling in the sprayer, and the tangential channel grooving in the vortex.
It is worth explaining that the above advanced processing technology and equipment should be tried to meet the requirements of large volume nozzle production units; For industries with high nozzle quality requirements (such as aviation and ground gas turbines, internal combustion engines, liquid rocket engine production plants or their supporting nozzle professional production plants), it is also necessary to meet the c for those units with less production capacity and slightly lower nozzle quality requirements, the necessary fixture, forming tool, grinding equipment, heat treatment and surface treatment equipment, small processing machine tools and other equipment It is indispensable.