Hot forging technology for wind power flange

Abstract

The invention discloses a hot forging technology for a wind power flange. The hot forging technology comprises the following steps of heating and then upsetting a continuous casting billet, and punching an upset forging piece and flattening the end face of the upset forging piece to complete a hot forging process; the upsetting process comprises the following steps that (1) the continuous castingbillet is directly upset to a height H1 which is equal to H0 / (1.6-2.1); H1 is the height after direct upsetting, and H0 is the height before upsetting; (2) rotary upsetting is carried out on the directly upset forging piece by using a flat anvil with a diameter of 500-700 mm; the rotary angle when the anvil enters is 90 degrees; and (3) after the rotary upsetting is carried out until the reductionis delta H / 2+ / -20 mm, the forging piece is turned over 180 degrees, and the rotary upsetting is carried out again by using the flat anvil with the diameter of 500-700 mm until the required size of afinished product is reached, and the delta H is the total reduction by the rotary upsetting. In the upsetting process of the hot forging technology, the force per unit area is increased, so that the three-dimensional compressive stress range of the whole section is expanded, and the compactness and uniformity of the structure of the forging piece can be effectively improved; and the mechanical properties of the product can be effectively improved, the qualified rate of flaw detection can be increased, and the overall quality level of the forging piece can be improved.

Description

technical field [0001] The invention relates to a forging process, in particular to a hot forging process of a wind power flange. Background technique [0002] Forging is a processing method that uses forging machinery to apply pressure to metal blanks to cause plastic deformation to obtain forgings with certain mechanical properties, certain shapes and sizes. Forging can eliminate defects such as as-cast porosity produced in the metal smelting process, optimize the microstructure, and at the same time preserve the complete metal flow line. [0003] Wind energy, as a clean and renewable energy source, has attracted more and more attention from various countries. Wind energy works through air flow, which contains huge energy. Therefore, wind power generation has attracted more and more attention. The wind power flange is used to connect the tower and the hub, the structural part between the hub and the blade, and is one of the important parts of the wind turbine. Since wind...

AI Technical Summary

Problems solved by technology

Because this kind of upsetting method cannot effectively forge the porosity and shrinkage cavity in the as-cast state, it will cause the structure of the wind turbine flange to be not dense and uneven; when testing the mechanical properties (tensile test and impact test), it is easy to In the weak part of the tissue, it will lose stability first, resulting in relatively low mechanical properties, and even the problem of inconsistent performance.

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