US 9,175,719 B2Granted

Method and device for determining center hole of crankshaft

AssigneeKomatsu Ntc Ltd.

InventorAkihiro Yoshimoto

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Abstract

A method of determining a center hole of a material crankshaft, which is obtained through molding with first and second molds, includes: obtaining first shape data of a first portion of the material crankshaft molded by the first mold and second shape data of a second portion of the material crankshaft molded by the second mold; comparing the first and second shape data respectively with first and second designed data corresponding to the first and second molds, respectively, for computing a misalignment amount of each of the first and second portions due to misalignment between the first and second molds; adjusting, based on the misalignment amount, data corresponding to the misalignment amount to reproduce actual shape data; and determining, based on the actual shape data, a position of the center hole in the material crankshaft such that a rotation balance of the material crankshaft is within a predetermined range.

Claims10

Dependent claims

A method of determining a center hole of a material crankshaft that is obtained through molding with a first mold and a second mold, the method comprising using a computer and a shape measuring machine to:

obtain first shape data of a first portion of the material crankshaft molded by the first mold by measuring the first portion;
obtain second shape data of a second portion of the material crankshaft molded by the second mold by measuring the second portion;
compute a first misalignment amount of the first portion due to a misalignment between the first and second molds by comparing the first shape data with first designed data corresponding to the first mold;
compute a second misalignment amount of the second portion due to the misalignment between the first and second molds by comparing the second shape data with second designed data corresponding to the second mold;
obtain first revised designed data based on the computed first misalignment amount;
obtain second revised designed data based on the computed second misalignment amount;
adjust, based on the misalignment amount, data corresponding to the misalignment amount so as to reproduce actual shape data;
and
determine, based on the actual shape data, a position of the center hole in the material crankshaft such that a rotation balance of the material crankshaft is within a predetermined range.

6 more elements

A device adapted to determine a position of a center hole of a material crankshaft that is obtained through molding with a first mold and a second mold, the device comprising:

a shape measuring machine configured to detect shape data of the material crankshaft;
and
a computer, the computer including
a shape data obtaining section configured to obtain first shape data of a first portion of the material crankshaft molded by the first mold by measuring the first portion, and obtain second shape data of a second portion of the material crankshaft molded by the second mold by measuring the second portion;
a misalignment amount computing section configured to compare the first and second shape data respectively with first and second designed data corresponding to the first and second molds, respectively, to compute a first misalignment amount of the first portion and a second misalignment amount of the second portion due to misalignment between the first mold and the second mold, and to obtain first revised designed data and second revised designed data based on the first and second misalignment amounts;
an actual shape data reproducing section configured to adjust, based on the misalignment amount, data corresponding to the misalignment amount so as to reproduce actual shape data;
and
a center hole determining section configured to determine, based on the actual shape data, the position of the center hole in the material crankshaft such that a rotation balance of the material crankshaft is within a predetermined range.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/993,860Filed 25 Jun 2009
Priority: JP 2008-19580730 Jul 2008
Published: US 2011/0071806 A124 Mar 2011
Granted: 3 Nov 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

F16C 3/08
Crankshafts: made in one piece
G01M 1/10
Testing static or dynamic balance of machines or structures: determining the moment of inertia
G01M 1/24
By oscillating or rotating the body to be tested: performing balancing on elastic shafts, e.g. for crankshafts
G05B 19/401
Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to…