New power monitoring and protection device will improve machine tool automation

The new power monitoring and protection device to realize the automatic monitoring of tool wear is an indispensable part of perfecting machine tool automation and realizing unmanned.

During the cutting process, the tool will wear due to mechanical friction and thermal effects. If the wear is small, the geometry of the tool will be changed, and the tool edge will burn out or even collapse. When it is worn to a certain extent, it must be reground, otherwise it will affect the dimensional accuracy and surface roughness of the workpiece, reduce the quality of the product, and even scrap. For tools that can still be cut, if the grinding is too frequent, the productivity of the machine tool is lowered, the consumption of the tool material is intensified, the labor productivity is lowered, and the production cost is increased. To this end, the machine tool operator must constantly monitor the wear of the tool during the cutting process, and timely change the knife and sharpen the knife to overcome the above drawbacks. This is very demanding for a person who is supervised by many automated machine tools.

At present, the manual monitoring of tool wear is far from being able to adapt to the increasing requirements of automated machine tools and automation. The automatic monitoring of tool wear is an indispensable part of perfecting machine tool automation and unmanned. A lot of experimental research has been carried out abroad, and Japan, Germany, the United States, the United Kingdom, the Netherlands and other countries have applied the automatic monitoring technology of tool wear to actual production.

It is reported that there are dozens of methods for directly and indirectly detecting tool wear during processing. Currently, a new type of power monitoring and protection device--computer power is widely used.

The power monitoring device operates on the principle of power detection of an electric motor. That is, when the machine tool cuts, as the tool wears, the load of the machine spindle motor and its current, the phase angle between the voltage and the current will change, resulting in power change. Using this change rule, the dynamic online automatic monitoring of the cutter wear and break can be realized. When the power changes to a certain value, the automatic detection and monitoring device sends an alarm signal, the tool holder automatically exits, and the machine tool automatically stops running, and the operator can change the knife, sharpen the knife and eliminate the fault in time.