Method for reconstructing temperature field of 1000MW supercritical turbo rotor groove face

Abstract

The invention relates to a method for reconstructing the temperature field of a 1000MW supercritical turbo rotor groove face, belonging to the technical field of mechanical cutting. The method comprises the following steps of: with a plurality of discrete points on a fir-shaped milling cutter profile line as detection points, obtaining the equivalent cutting speed, the equivalent cutting thickness and the equivalent feeding speed for a standard cutting test by using a standard integral-type cylindrical milling cutter; obtaining finite element modeling temperatures of the detection points by adopting an infinitesimal modeling method; performing a standard cutting test, measuring the cutting temperature by adopting a semi-artificial thermocouple method and modifying the equivalent two-dimensional orthogonal cutting finite element model by using the measured temperature values; and simulating other discrete points by using the modified simulation model to fit to obtain the temperature field distribution of the 1000MW supercritical turbo rotor groove face. By processing the complex profile of a groove, reasonably selecting the cutting tool, timely replacing the tools and regulating the cutting parameter, the invention ensures the production quality and improves the production efficiency.

Description

technical field [0001] The invention relates to a method in the technical field of mechanical cutting, in particular to a method for reconstructing the temperature field of the groove surface of a rotor wheel of a 1000MW supercritical steam turbine. Background technique [0002] The rotor groove is the part connecting the main shaft of the steam turbine rotor and the blades. During the start-up and shutdown of the steam turbine, it not only bears the alternating thermal stress caused by the temperature difference in the steam turbine room, but also bears the alternating tensile and compressive stresses of the blades on the groove surface. effect. The harsh working environment puts forward high requirements on the wheel groove material. Correspondingly, the rotor wheel groove material has poor machinability, which is mainly characterized by high cutting force, high cutting temperature, severe tool wear and low machined surface quality. At the same time, the working environme...

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Problems solved by technology

[0004] It is very difficult to measure the machining temperature of the wheel groove online. In the production site, the operator usually judges whether the tool is excessively worn or whether the cutting temperature has risen sharply through noise, sparks and other phenomena during the machining process, and then reacts accordingly. This response is hysteresis

Relatively speaking, it is easier to quantitatively measure cutting temperature in basic experiments than online detection, but the measurement of cutting temperature is easily disturbed by experimental conditions and external environment, and the measurement process is complicated and the stability is poor. Therefore, it is important to predict cutting temperature theoretically. significance

[0005] After searching the existing literature, no public reports have been found on the reconstruction method of the temperature field of the rotor groove surface of the 1000MW supercritical steam turbine.

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