Plastic Injection Mold is an assembly of parts containing within it an impression into which plastic material is injected and cooled. It's the impression which gives the moulding its form. The impression may, therefore, be defined as that part of the mould which imparts shape to the moulding.
The impression is formed by two mould members:
Cavity and core plates: This is illustrated for a simple container, the basic mould, in this case, consists of two plates. Into one plate is sunk the cavity which shapes the outside form of the moulding and is therefore known as the cavity plate.
Similarly, the core which projects from the core plate forms the inside shape of the moulding. When the mould is closed, the two plates come together forming a space between the cavity and core which is the impression.
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Currently, manual monitoring of tool wear has been far from adapting to the increasing demands of automated machine tools and automation. Automatic monitoring of tool wear is an essential part of improving machine automation and achieving unattended operation. Abroad has conducted a large number of experimental studies. Japan, Germany, the United States, the United Kingdom, the Netherlands and other countries have applied automatic tool cutting wear monitoring technology 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, a computer power monitor, is widely used.
The power monitoring device works on the principle of power detection of an electric motor. That is, when the machine tool performs cutting, as the tool wears, the load and current of the spindle motor of the machine tool, the phase angle between the voltage and the current will change, and the power will change. Using this change rule, the dynamic online automatic monitoring of the broken tool can be realized. When the power is changed to a certain value (that is, the tool is worn to the extent that it should be reground), the automatic detection monitoring device will send an alarm signal, the tool post will automatically exit, the machine tool will automatically stop running, and the operator can promptly change the tool, sharpen the tool, and troubleshoot. .
Power monitor application in machine tools
In the cutting process, due to mechanical friction and thermal effects, the tool will wear out, and this wear will cause the tool geometry to be changed, and the tool edge will burn or even collapse. When worn to a certain degree, it must be reground, otherwise it will affect the dimensional accuracy and surface roughness of the workpiece, reduce the product quality, and even scrap. For cutting tools that are still able to cut, if the sharpening is too frequent, the productivity of the machine tool is reduced, the consumption of tool materials is increased, the productivity of labor is reduced, and the production cost is increased. For this reason, the machine operator must constantly monitor the wear of the tool during the cutting process and change the tool and sharpen the tool in order to overcome the above drawbacks. This is very demanding for a person who is looking after the operation of multiple automated machine tools.