On-line monitoring method of tool wear and damage based on spindle drive current and working steps

Abstract

The invention discloses an on-line monitoring method for tool wear and damage based on spindle drive current and working steps. By realizing communication with a numerical control system to obtain processing step information, and simultaneously monitoring the spindle drive current and load, based on the difference in cutting torque between normal tools and worn and damaged tools Analyze and statistic the principle of quality control, by drawing the control chart of the average current / load required for each process step, reasonably formulate the control line of the control chart, determine the wear status of the tools used in each process step, and formulate the rules for tool replacement or tool sharpening. According to the fact that the instantaneous spindle current or the instantaneous load in each working step deviates from the change rule of the instantaneous current / load in the normal processing, it is judged that the tool is damaged, and an alarm signal is sent to notify the CNC system of an emergency stop to avoid serious consequences of damage to the workpiece and the machine tool . On the one hand, the method can reduce the rejection rate of parts and the failure rate of machine tools, on the other hand, it can also maximize the service life of the cutting tool and reduce the cost of using the cutting tool in the factory.

Description

Technical field [0001] The present invention relates to a method and apparatus for monitoring a state of abrasion damage to CNC machine tool tool, and more particularly to a tool wear damage line monitoring method based on CNC machine spindle driving current and workpiece machining step information, which is a CNC machine tool state monitoring technology. Background technique [0002] With the continuous development of intelligent manufacturing technology, the automation of manufacturing system is getting higher and higher, and the production process tends to be unattended, especially during the actual production process, the tool is frequently worn in the cutting process. The wear damage of the tool is the most common phenomenon in the machining and manufacturing process. The light can cause the workpiece to scrap, and the heavy consequences are caused by the cutter and spindle damage. Conventional tool wear detection has a direct measurement method and an indirect measurement m...

AI Technical Summary

Problems solved by technology

The direct measurement method is used to measure the appearance and geometric dimensions of the blade, but it needs to be stopped for detection and takes up public hours. According to industrial statistics, the resulting downtime accounts for about 20% to 30% of the total downtime of the machine tool; the indirect measurement method mostly uses the installation of sensors. Monitor the characteristic signal, but the installation and use of the sensor will affect the normal processing and even need to change the structure of the machine tool, mostly used to verify the theoretical research

Scholars at home and abroad have made remarkable achievements in the field of on-line monitoring of tool wear, but there are still some problems in the actual production process. Poor applicability of factors

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