5 asfreesbewerking van turbinewaaier

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 asfrezen van turbinewaaier

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.
Voordat we 5-assige CNC-bewerkingscentra adopteerden, De meeste fabrikanten van turbomachines gebruikten werktuigmachines met 3 of 4 assen om waaiers te verwerken, en de meesten van hen gebruikten puntbewerking. Dat is, elk punt op het bladoppervlak wordt door de gereedschapspunt tot een punt verwerkt. Wanneer het gereedschap langs het oppervlak van het mes beweegt, er zullen wat putjes of resterende scherpe hoeken achterblijven, en de hoogte van deze putten of scherpe hoeken hangt af van de programmeervaardigheden. Puntverwerking is ook een haalbare methode, maar deze methode heeft enkele onvermijdelijke nadelen:

1. The surface of the impeller blade is not smooth, leaving some small grooves. These small grooves must be parallel to the flow direction (zie figuur 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. In other words, the tool must move many times around the impeller blades.