PRODUCT CATEGORIES

Vacuum Heat Treatment Furnace

Vacuum Sintering Furnace

Vacuum Brazing Furnace

Vacuum heat treatment of machine parts

The structure of modern aircraft is complex and there are many kinds of parts, so it is difficult to use traditional heat treatment methods for processing. In order to control the weight of the aircraft, a notable feature of aircraft parts is the thin-walled design. On the other hand, the large-scale aircraft also makes the part structure tend to be large-scale, and many super-large parts appear, so thermal deformation has become a prominent contradiction.

Vacuum heat treatment has the advantages of high quality, low energy consumption, no pollution (or less pollution), and can effectively prevent workpiece defects, improve surface roughness, and reduce friction factor. Vacuum heating is carried out in the form of radiation, the heating is slow, the furnace temperature is uniform, the product deformation is small, and it also has dehydrogenation effect, which is conducive to improving the quality of heat-treated parts.

Except for some small aircraft and helicopters, the main force-bearing structural parts of the landing gear of the aircraft, such as the outer cylinder of the main body pillar, the piston rod, the outer cylinder of the front body pillar, the piston rod, the diagonal brace, the upper and lower anti-torque arms, and the large shaft of the wheel , fastening bolts, etc. These components are manufactured using a vacuum heat treatment process. The materials currently used are basically 300M, 30CrMnSiNi2A, 4340M, 35NCD16, S99, 4330M, 30CrMnSiA, 45, 50CrV steel and TC4 titanium alloy.

Taking 30CrMnSiNi2A material as an example, it shows the advantages of vacuum heat treatment:

The vacuum heat treatment of 30CrMnSiNi2A steel is mainly for the heat treatment of key parts such as the main pillar outer cylinder and piston rod. Technical requirements: the strength is (1700 ± 100) MPa. The vacuum heat treatment process is: preheating at 600°C, vacuum degree 13.3-1.33Pa; austenitization at 900°C, vacuum degree 1.33-1.33×10=Pa; oil quenching, tempering at 300°C.

In the heat treatment practice of 30CrMnSiNi2A steel for many years, the strength and hardness of vacuum oil quenching are higher than that of air furnace oil quenching. A similar situation is also found in the heat treatment practice of 4Cr13 steel and 30CrMnSiA steel. In the vacuum heat treatment, the quenching oil is fully degassed, and the entire quenching process is carried out in a vacuum state. The moment the parts are quenched into the oil, the quenching oil can fully contact with all surfaces of the parts, and the quenching performance of the parts can be fully exerted. In the air furnace oil quenching, the moment the parts are quenched into the oil, the oxygen dissolved in the oil will react with the quenching oil on the surface of the parts to generate CO2 gas. At the high temperature stage of quenching, the entire surface of the parts is almost surrounded by a CO2 gas film, reducing the The cooling capacity of the oil fails to give full play to the quenching performance of the parts.

In addition to the above examples, in 300M, 30CrMnSiNi2A, 4340M, 35NCD16, 35CD4, S99, 4330M, 30CrMnSi, 45, 50CrV and other steels, TC4, BTA3-1, TC6 and other titanium alloys, lCr18Ni9Ti, 2Cr13, 3Cr13, 4Cr13, GCr15, Cr12MoV, Vacuum annealing of precipitation hardening stainless steel such as 17-7PH and WD350 silicon steel sheet, vacuum quenching of 12CrNi3 steel carburized parts, vacuum annealing of 1J79 iron chips, vacuum brazing of aluminum alloy, various types of landing gear outer cylinders, piston rods, and large wheels In terms of rework of key parts such as shafts, vacuum heat treatment has exerted its own advantages, and it is an important heat treatment technology in the aviation field.

Vacuum furnace equipment selection: When performing heat treatment, equipment selection is extremely important. The VOGQ vacuum oil quenching furnace produced by SIMUWU is the perfect choice for this type of processing. High technical level, good heating uniformity, high temperature control precision, convenient processing, full PLC control, convenient and fast advantages.