Method for estimating thermal displacement in a machine tool

Details Method for estimating thermal displacement in a machine tool Method for estimating thermal displacement in a machine tool

1998-08-18

2000-02-01

Bennett, G. Bradley

Thermal measuring and testing

Thermal testing of a nonthermal quantity

Expansion or contraction characteristics

374 56, 364474, G01N 2500, G01N 2186, G06F 1900

Patent

active

060195061

ABSTRACT:
A method for estimating the thermal displacement of a rotatable component of a machine tool is provided which includes the steps of: (A) generating a signal representative of the temperature of at least one rotatable component of a machine tool, the component being rotatable having a variable rotational speed and a variable temperature; (B) converting the signal representative of the temperature into a numerical value; and (C) estimating the thermal displacement of the rotatable component based on the numerical value using an operational expression. In this method, the operational expression includes a coefficient which is a function (f(n)) that changes with time or the number(n) of compensation operations performed, with the function (f(n)) determined by a relational expression T(N)) relating the time constant (T .delta.) of the thermal displacement and the rotational speed (N) of the rotatable component. In according to this method, the relational expression (TN)) is obtained by experiment and held in a storage device prior to implementation of the process of estimation.

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patent: 5779405 (1998-07-01), Aiso et al.
patent: 5895181 (1999-04-01), Ito et al.

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