Turning and quality assurance process for thermally sprayed turbomachine linings
AssigneeMTU Aero Engines AG
InventorWolf-Dieter Feist
Life of this patent
Estimating the term…
Abstract
A rotational machining and quality assurance method for thermally extruded linings of turbomachinery are provided. First, a harder top coating is removed by turning, then the lining is finish-turned to size. During the finish-turning, defined turning parameters are maintained and a cutting force characteristic is quantitatively detected and stored. The force characteristic is compared with predetermined limit values, and, depending on the result of the comparison, the lining is approved for use or is produced again.
Claims20
A turning and quality assurance process for thermally sprayed, rotationally symmetrical grazing and running-in linings of turbomachines, comprising:
- removing a top coating, which is harder in relation to a nominal lining consistency, by turning,
- finish-turning to size the lining still having excess material,
- predetermining turning parameters during the finish turning, said turning parameters including geometry of a cutting tool cutting tip, rotational cutting speed of the cutting tool, axial cutting tool feed and radial recessing depth/infeed of the cutting tool,
- maintaining a plurality of said predetermined parameters constant during the finish-turning,
- quantitatively detecting a characteristic proportional to a cutting force during the final turning,
- recording graphically or storing said characteristic in a data system,
- comparing the force characteristic with predetermined limit values, and
- depending on a result of the comparison, approving the lining for use, or removing again and producing again with altered spraying parameters.
A method of making a thermally sprayed lining of a turbomachine, comprising:
- removing a top coating of the lining by turning,
- finish-turning the lining to a predetermined size,
- predetermining turning parameters during the finish turning, said turning parameters including geometry of a cutting tool cutting tip, rotational cutting speed of the cutting tool, axial cutting tool feed and radial recessing depth/infeed of the cutting tool,
- maintaining a plurality of said predetermined parameters constant during the finish-turning,
- quantitatively detecting a characteristic of a cutting force or a force proportional thereto during the finish turning,
- recording graphically or storing said characteristic,
- comparing the characteristic with predetermined limit values, and
- approving the lining for use based on a result of the comparing of the characteristics with the limit values.
Dependencies are inferred from the claim text.