US 2014/0154470 A1Published application

Machining method

AssigneeROLLS-ROYCE plc

InventorsWee Kin TEO, Tao Pey YUEN, Lai Chow YIN, Lim Tao MING, Sathyan SUBBIAH

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Abstract

A method of machining an article. The method includes: scanning the article to determine an initial surface profile; determining a cross sectional area removed from the article by a material removal tool in a material removal pass under controlled conditions; using the cross sectional area to determine one or more material removal tool contact angles for at least one material removal pass by the material removal tool under the controlled conditions required to conform the initial surface profile to a nominal surface profile; and machining the article to conform the initial surface profile to the nominal surface profile.

Claims16

Dependent claims

A method of machining an article to conform the article to a nominal surface profile, the method comprising:

scanning the article to be machined to determine an initial surface profile;
using a material removal rate model to determine a cross sectional area removed from the article by a material removal tool in a material removal pass under controlled conditions;
using the determined cross sectional area to determine one or more material removal tool contact angles relative to a surface of the article for at least one material removal pass by the material removal tool under the controlled conditions required to conform the initial surface profile to a the nominal surface profile;
and
performing one or more material removal passes by the material removal tool at the one or more contact angles under the controlled conditions to conform the initial surface profile to the nominal surface profile.

2 more elements

A method according to claim I, wherein the step of determining the material removal tool contact angle for each respective material removal pass comprises a contact angle search algorithm, the contact angle search algorithm comprising the steps of:

defining one or more test contact angles of the material removal tool relative to the surface profile of the article;
comparing each test contact angle to a surface profile to determine a respective cutting profile for each test contact angle;
comparing the respective cutting profile to the surface profile to determine a respective simulated cross sectional area removed by the respective cutting profile for each test angle;
using the material removal rate model to determine a cross sectional area which would be removed by the material removal tool from the article at the respective contact angle;
comparing each simulated cross sectional area to the cross sectional area determined by the material removal rate model;
and
selecting one or more test contact angles which provide a simulated cross sectional area which substantially matches the cross sectional area determined by the material removal rate model area.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/091,951Filed 27 Nov 2013
Priority: GB 1221749.34 Dec 2012
Published: 5 Jun 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G05B 19/182
Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to…
G05B 19/401
Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to…
G05B 19/4099
Characterised by using design data to control NC machines, e.g. CAD/CAM: surface or curve machining, making three-dimensional [3D] objects, e.g.…
G05B 2219/45147
Nc applications: machining blade, airfoil

Family

No related US applications are recorded in the indexed filing history.

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