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Surface processing method for matchable, conforming to fluid tech.

A fluid technology, matching technology for use in the field of surface processing for matching fluid technology

Inactive Publication Date: 2008-02-06
MTU AERO ENGINES GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method, which provides a special form of "repair", is also suitable for rotor units with integral blades, but only for repairs at the blade tips

Method used

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  • Surface processing method for matchable, conforming to fluid tech.
  • Surface processing method for matchable, conforming to fluid tech.
  • Surface processing method for matchable, conforming to fluid tech.

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0029] A partial hub 4 and partial blades 7 can be seen from the rotor unit 1 with integral blades in FIG. 1 . The blades 7 are preferably fastened by linear friction welding to a raised projection of the hub 4 and have a radially inward bottom end with a thickening 11 for steering and force transmission. Landing region 14 is marked with hatching. It is clearly shown by the intentionally exaggerated illustration that the blades 7 are fastened with geometrical tolerances. For example, the blades exhibit not only a lateral offset to the right with respect to the hub 4 but also an angular error, ie a rightward deviation from the radial inclination.

[0030] Figure 1 shows the possible situations in the range of new parts processing and repairing, where the combination of letters and numbers on the left side of the blade is related to the repairing status, while the combination on the right side is related to the processing of new parts.

[0031] The surfaces of the blades 7 sho...

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PUM

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Abstract

A method for producing matched surfaces on rotor units with integral blades comprising a hub and at least one blade ring, by removing by machine after integral joining with component overmeasure in the area of the joining zone, whereby at least one actual surface is acquired by measuring method, and a surface matching it, is produced. Acquisition by measuring method and production take place on a process machine in one clamping of the rotor unit. The desired surface of each processing area is provided in the form of stored data. Starting from at least one measured actual surface, a matched surface is produced beyond the joining zone, with the surface everywhere adjoining the actual surface and / or a so-called repair surface of which there is at least one, without any kinks or steps at a specifiable minimum curvature. As far as is possible, the surface itself corresponds to a mathematically continuous spatial surface comprising a locally and / or direction-dependent variably-specifiable minimum curvature, whereby approximation to the desired profile takes precedence over approximation to the desired position.

Description

technical field [0001] The invention relates to a method for producing a suitable fluidic surface on a rotor unit with integral blades. Background technique [0002] The blades of the rotor unit with integral blades are rationally and seamlessly connected to the hub, for example, by welding, forging, brazing or bonding. In general, such rotor units have advantages and are therefore increasingly being used in advanced turbomachinery designs. This is primarily concerned with the replacement of the positively connected turbine blade fastenings (for example with fir-leaf or dovetail-shaped fastenings) that are generally customary in rotors through which the flow is substantially axial. As has already been recognized, both blade fastening / blade installation and blade repair / blade replacement are more expensive and difficult for rotor units with integral blades than for form-connected designs. Therefore, it is necessary to improve or study new processing and repair methods, amon...

Claims

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Application Information

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IPC IPC(8): B23P13/02B23P15/04F01D5/14B23C3/18B23H9/10B23P6/00B23P15/00F01D5/00F02C7/00
CPCF05D2250/29F01D5/005B23P6/002F05B2250/19B23P13/02B23P15/006F05D2250/19F05B2250/29
Inventor P·梅青格R·斯特尔策R·海默尔G·穆沙尔A·格莱泽尔
Owner MTU AERO ENGINES GMBH