This article relates to the field of aero-engine vacuum brazing technology, and more specifically, to a thermal calibration process of vacuum brazed parts. First, check the inner diameter size of the vacuum-brazed parts, process the calibration fixture, clean the parts and the calibration fixture, Then bake the parts, and coaxially install the parts on the outer periphery of the calibration fixture while it is hot. Use a vacuum brazing furnace to perform thermal cycling on the parts. Since the linear expansion coefficient of the calibration fixture is larger than the parts, use a vacuum brazing furnace to perform thermal cycling on the parts. During thermal cycle, the expansion degree of the calibration fixture is greater than the expansion degree of the parts. The calibration fixture spreads the parts in the radial direction, increasing the radial size of the parts, ensuring that the vacuum brazed parts meet the size requirements, and solving the problem of radial size shrinkage of the parts. The issue of scrapping.
A thermal calibration process for vacuum brazed parts, which is characterized by including the following steps:
1: Measure the inner diameter of the part (1); /
2: Select raw materials with a linear expansion coefficient greater than that of the part (1), process the calibration fixture (2) according to the inner diameter of the part (1), bake the part (1), and coaxially interfer the part (1) while it is hot. Installed on the outer periphery of the calibration fixture (2);
3: Control the temperature in the vacuum brazing furnace to be below the solidus line of the solder used in part (1), and use the vacuum brazing furnace to perform a thermal cycle on part (1); /nS4: After cooling part (1), Remove the part (1), check the size of the part (1), and complete the hot calibration of the part (1).