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Numeric control device of machine tool

A numerical control device and machine tool technology, applied in computer control, program control, general control system, etc., can solve problems such as increased cutting load vibration, difficulty in detecting abnormality of the spindle or spindle motor, etc.

Inactive Publication Date: 2009-01-28
FANUC LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in the vibration monitoring of the spindle or spindle motor of a machine tool, there is a problem that it is difficult to detect an abnormality of the spindle or the spindle motor itself because the vibration caused by the cutting load increases when a load is applied to the spindle during cutting.

Method used

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  • Numeric control device of machine tool
  • Numeric control device of machine tool

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Embodiment Construction

[0018] FIG. 1 is a diagram showing the configuration of a numerical controller 10 of the present invention. The numerical controller 10 has a first storage unit 12 , a calculation unit 14 , a determination unit 16 , and an output unit 18 . The first storage unit 12 stores vibration data output from a vibration sensor 22 mounted on a spindle of a schematically shown machine tool or a spindle motor 20 as main vibration data 26 associated with an operation mode 24 for detecting abnormality of the spindle. The specific operation method is a program shown below, which lists a plurality of combinations of the rotation speed of the operating spindle and the operation time at the rotation speed, and is stored in the first storage unit 12 of the numerical controller 10 .

[0019] Program example

[0020] 1: Forward rotation command

[0021] 2: 1500min -1 ,30 seconds

[0022] 3: 3000min -1 ,30 seconds

[0023] 4: 6000min -1 ,30 seconds

[0024] 5: 9000min -1 ,30 seconds

[002...

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Abstract

A numeric control device with a simple structure of a machine tool, capable of detecting a defect of a spindle or a spindle motor of the machine tool and automatically informing an operator of the defect, is provided. A numeric control device has a first storing part, a calculating part and a judging part. The first storing part stores master vibration data of the spindle or the spindle motor, the master vibration data being prepared by associating data of the vibration outputted from a vibration sensor arranged on the spindle or the spindle motor with an operation pattern for detecting the defect of the spindle or the spindle motor. When a difference value between the master vibration data and newly obtained data exceeds a predetermined reference value, the judging part determines that the new data is abnormal.

Description

technical field [0001] The present invention relates to a numerical control device of a machine tool, and more particularly to a numerical control device having an abnormality detection function of a spindle of a machine tool or a spindle motor. Background technique [0002] When an abnormality occurs in a rotating part such as a bearing in the spindle or spindle motor of a machine tool, it often takes a long time to replace it. As a result, the machine tool or the production line composed of the machine tool stops for a long time, and the manufacturer suffers a huge loss. Therefore, attempts have been made to detect abnormalities in rotating parts in advance by installing a vibration sensor or the like in a spindle or a spindle motor of a machine tool to monitor vibration. [0003] In specification US2003-0103827A1 a shaft is disclosed which has the following units: a data detection unit which detects the temperature or vibration of the shaft, a data storage unit which stor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/4065
CPCB23Q17/12G05B2219/37226G05B2219/50197G05B2219/37391G05B19/406G05B2219/37435G05B2219/34465
Inventor 桝谷道吉村一贵中泽康之
Owner FANUC LTD
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