US 10,245,697 B2Granted

Method for controlling temperature adjustment system of machine

AssigneeOkuma Corporation

InventorsEisuke Sogabe, Seiei Yamamoto

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Abstract

A method for controlling a temperature adjustment system of a machine tool is provided. With the method, a temperature rise value ΔTk of a main spindle device after stopping of rotation of a main spindle is obtained by using a reference temperature measured by a machine body temperature sensor mounted in a portion other than the main spindle device of a machine tool to calculate an estimated temperature yk. Therefore, as compared to a conventional method based only on a temperature of a cooling medium, supply of the cooling medium by a cooling device can be stopped or an operation of the cooling device can be switched from a first mode to a second mode without deteriorating machining accuracy in the main spindle device, thereby efficiently reducing power consumption.

Claims15

Dependent claims

A method for controlling a temperature adjustment system of a machine tool, the temperature adjustment system including:

a medium supply and collection device for supplying, a medium having a temperature to be adjusted, to a structural member of the machine tool, and collecting, the medium having a temperature to be adjusted, from the structural member;
and a temperature adjusting device for adjusting a temperature of the medium having a temperature to be adjusted, the method comprising:
a first step of
measuring a structural-member temperature that is a temperature near a first portion in the structural member, after stopping of a machining operation that causes temperature change of the medium having a temperature to be adjusted, the first portion contributing to the temperature change of the medium having a temperature to be adjusted and being deformed due to the temperature change of the medium having a temperature to be adjusted,
measuring a reference temperature that is a temperature of a second portion, in the machine tool, which is not involved in the temperature change of the medium having a temperature to be adjusted, and which is not deformed due to the temperature change of the medium having a temperature to be adjusted, and
obtaining a temperature change value based on the structural-member temperature and the reference temperature;
a second step of obtaining an estimated temperature of the first portion based on the temperature change value;
and
a third step of determining, based on the estimated temperature, whether or not at least one of an operation of the temperature adjusting device and an operation of the medium supply and collection device is stopped, or whether or not at least one of an operation of the temperature adjusting device and an operation of the medium supply and collection device is switched from a first mode representing a normal operation to a second mode in which power consumption is less than that in the first mode,
wherein, in the second step, the estimated temperature is obtained by using:
the temperature change value;
and a coefficient that is previously obtained such that a time response is the same between the estimated temperature and temperature change of the first portion.

9 more elements

A method for controlling the temperature adjustment system of a machine tool, the temperature adjustment system including:

a medium supply and collection device for supplying, a medium having a temperature to be adjusted, to a structural member of the machine tool, and collecting, the medium having a temperature to be adjusted, from the structural member;
and a temperature adjusting device for adjusting a temperature of the medium having a temperature to be adjusted, the method comprising:
a first step of
measuring a structural-member temperature that is a temperature near a first portion in the structural member, after stopping of a machining operation that causes temperature change of the medium having a temperature to be adjusted, the first portion contributing to the temperature change of the medium having a temperature to be adjusted and being deformed due to the temperature change of the medium having a temperature to be adjusted,
measuring a reference temperature that is a temperature of a second portion, in the machine tool, which is not involved in the temperature change of the medium having a temperature to be adjusted, and which is not deformed due to the temperature change of the medium having a temperature to be adjusted, and
obtaining a temperature change value based on the structural-member temperature and the reference temperature;
a second step of obtaining an estimated temperature of the first portion based on the temperature change value;
and
a third step of determining, based on the estimated temperature, whether or not at least one of an operation of the temperature adjusting device and an operation of the medium supply and collection device is stopped, or whether or not at least one of an operation of the temperature adjusting device and an operation of the medium supply and collection device is switched from a first mode representing a normal operation to a second mode in which power consumption is less than that in the first mode,
wherein, in the third step, the estimated temperature and a predetermined estimated temperature threshold value are compared with each other, and whether or not at least one of an operation of the temperature adjusting device and an operation of the medium supply and collection device is stopped, or whether or not at least one of an operation of the temperature adjusting device and an operation of the medium supply and collection device is switched from the first mode to the second mode, is determined based on a comparison result,
a preprocessing step of
measuring the structural-member temperature and the reference temperature before a machining operation that causes temperature change of the medium having a temperature to be adjusted,
obtaining a temperature change value based on the structural-member temperature and the reference temperature,
obtaining the estimated temperature of the first portion based on the temperature change value,
obtaining a rate of change of the estimated temperature,
comparing the rate of change of the estimated temperature with a predetermined rate-of-change threshold value, and
updating the estimated temperature threshold value according to a comparison result.

14 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/881,483Filed 13 Oct 2015
Priority: JP 2014-22053329 Oct 2014
Published: US 2016/0121445 A15 May 2016
Granted: 2 Apr 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B23Q 11/127
For cooling only: for cooling motors or spindles
G05B 19/18
Electric: numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as…
G05B 2219/34306
Director, elements to supervisory: power down, energy saving
Y02P 70/10
Climate change mitigation technologies in the production process for final industrial or consumer products: greenhouse gas [GHG] capture, material…

Family

US 2016/0121445 A1Pre-grant publication · published 5 May 2016
US 10,245,697 B2This patent

From the US filing history. Foreign family members aren’t listed.

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