5 usinagem de fresamento de eixo do impulsor da turbina

Turbine impellers with complex shapes need to be machined with a 5-axis milling machine to be able to machine every corner of its geometry.
In a modern design system, the geometry that needs to be processed is designed by the CAD system, and then converted into the tool trajectory in the CAM system. The output result is converted into the movement of each of the 5 axes of the milling machine through a post-processing program. For turbomachinery impellers, it is necessary to consider dedicated CAM software. In terms of technology, impeller processing is mainly composed of the following 5 distinct operations:

1, the flow path between the rough machining blades
2, milling the hub part
3. Milling round inlet and outlet edges
4. Finishing the surface of the impeller blade with a small amount of cutting
5. Variable radius fillet processing of the root of the impeller blade

5 fresagem do eixo do impulsor da turbina

Special attention should be paid to areas on the surface of the impeller blades that cannot be reached by the tool. Because at this time it is easy to cause interference between the cutter and the adjacent blades.
Antes de adotar centros de usinagem CNC de 5 eixos, a maioria dos fabricantes de turbomáquinas usava máquinas-ferramentas de 3 ou 4 eixos para processar impulsores, e a maioria deles usava usinagem de ponto. Aquilo é, cada ponto na superfície da lâmina é processado em um ponto pela ponta da ferramenta. Quando a ferramenta se move ao longo da superfície da lâmina, deixará alguns buracos ou cantos afiados residuais, e a altura desses buracos ou cantos agudos depende das habilidades de programação. O processamento de pontos também é um método viável, mas este método tem algumas desvantagens inevitáveis:

1. The surface of the impeller blade is not smooth, leaving some small grooves. These small grooves must be parallel to the flow direction (Veja a figura 1).
2. For blades with severe curvatures, due to the close spatial distance of the impeller blades, it is difficult to avoid interference with adjacent blades during processing.
3. If you want to reduce the influence of the groove on the flow field, a long processing time is required. Em outras palavras, the tool must move many times around the impeller blades.