US 2020/0208529 A1Published application

Method for machining free-form surface on elongated material

AssigneeMitsubishi Hitachi Power Systems, Ltd.

InventorsTakuya NAKANISHI, Nobuo SHIMIZU, Haruhiko ASAKA, Kazuya MATANO

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Abstract

After a free-form surface is machined on an elongated material 1 with a projection 3 and a blade root 4 held, the holding of the projection 3 is released to release strain generated during machining. Upon release of the holding, the entire elongated material 1 deforms, and the projection 3 moves from a holding position A to a strain-released position B. A re-holding position C obtained by correcting the position B by the deformation amount of the elongated material 1 due to the weight of the elongated material 1 is determined, and the projection 3 is held again at the re-holding position C for further machining the free-form surface on the elongated material 1.

Claims10

Dependent claims

A method for machining a free-form surface on an elongated material having a first end region and a second end region with respect to a longitudinal direction, the method comprising:

a step of holding the first end region and the second end region;
a first machining step of machining the free-form surface on the elongated material with the first end region and the second end region held;
a step of releasing holding of the first end region;
a step of determining a re-holding position obtained by correcting a position of the first end region after the holding of the first end region is released by a deformation amount of the elongated material due to a weight of the elongated material;
a step of holding the first end region again at the re-holding position;
and
a second machining step of further machining the free-form surface on the elongated material after holding the first end region again.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/616,687Filed 27 Jun 2018
Priority: JP 2017-12665128 Jun 2017
Published: 2 Jul 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification25 codes

F01D 5/147
Form or construction: construction, i.e. structural features, e.g. of weight-saving hollow blades
B23P 15/02
Making specific metal objects by operations not covered by a single other subclass or a group in this subclass: turbine or like blades from one piece
B24C 1/10
Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods: for compacting…
F01D 25/285
Supporting or mounting arrangements, e.g. for turbine casing: temporary support structures, e.g. for testing, assembling, installing, repairing;…