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A method for judging tool change

A tool and cutting force technology, applied in the field of tool change judgment, can solve the problems of poor model reliability and economy, and achieve high economic results

Active Publication Date: 2021-06-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
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Problems solved by technology

[0003] However, the existing patents on tool monitoring rely on objective experimental data, which leads to poor reliability and economy of the trained model

Method used

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  • A method for judging tool change

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] The judging method for tool change of the present invention comprises the following steps:

[0023] Step 1: NC simulation, obtain the cutting geometric parameters, and substitute them into the empirical formula log(F c / b)=log(k c1，1 )+(1-m c ) × logh, to obtain the time-domain cutting force data during the calculation process, and to generate computer simulation training samples based on this;

[0024] Step 2: Reduce the dimension of the sample, train the support vector machine classification model with Gaussian kernel, set the sensor to collect the cutting force signal in real time and compare it with the model. When the relative error is greater than 20%, it is judged that the tool needs to be changed.

[0025] Among them, the specific method of step 1 is as follows:

[0026] (1). Numerical control simulation: Take Vericut software as an example, set the ...

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Abstract

The invention discloses a tool change judging method, which belongs to the technical field of tool state monitoring in mechanical manufacturing. The wear of the tool in the actual production process will have a great impact on the processing quality of the workpiece, and the traditional tool monitoring is inefficient. The cutting force directly reflects the working state of the tool, and the research on related calculation methods is relatively mature. By simulating the tool geometry and using the revised cutting force empirical formula to calculate, the cutting force samples are obtained; the samples are put into the machine learning framework, and the training results can be applied to actual processing. This method can be widely used in various cutting processes, and it is of great significance to promote the intelligentization of manufacturing industry.

Description

Technical field: [0001] The invention relates to a tool change judgment method, which belongs to the technical field of machine tool monitoring. Background technique: [0002] With the increasing requirements for manufacturing automation and intelligence under Industry 4.0, the demand for automatic tool monitoring technology is also gradually increasing, and a certain number of related patents have been obtained. Patent of Huazhong University of Science and Technology, "A Method for Recognition of Tool Wear State in CNC Machine Tool Cutting Processing", which measures multi-physical quantities under tool wear state, performs wavelet packet decomposition and feature extraction on samples, and substitutes them into generalized hidden Markov initial model training ;Patent of Huazhong University of Science and Technology, "A Method for Monitoring Tool Breakage in CNC Machine Tool Milling", which monitors the three-phase current signal of the spindle motor online, performs singul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B17/02
CPCG05B17/02
Inventor 杨吟飞李亮徐涛何宁赵威郝秀清赵国龙
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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