Determination of tool life in woodworking
With the increase of cutting length, the cutting force increases, and the change of normal component is greater than that of horizontal component, so the change of normal component is an important index to evaluate the tool wear.
If the tool is worn, then the plastic deformation or damage state occurs near the cutting edge, there will be different acoustic emission, which can be monitored by measuring the acoustic emission signal during the cutting process. From the change of the signal, the tool wear can be checked online. As the amount of tool wear increases, AE signals with larger amplitudes decrease gradually.
The relationship between cutting speed (V) and tool life (T) is shown in the following formula, VTn=C, where n and C are constants.
This formula is called the tool life equation, n is the cutting speed on the tool life degree of the index value, when n is greater than 1, in the tool life range, high-speed cutting can make the cutting length increase, that is to say, in the same cutting dosage, the faster the cutting speed the smaller the wear. When n is between 0 and 1, in the range of tool life, high-speed cutting can shorten the cutting length, the greater the C value, the easier the cutting process, and the better the material is cut. During drilling, n is 0.69-3.1 and C is 1.6x102-3.6x109. This tool life equation is based on the same amount of wear, and assumes that the machining accuracy has no effect on the tool life, only for the tool material and the processing nature itself to obtain, that is, if the same amount of wear is achieved, regardless of the processing accuracy, it is assumed that the tool has reached the service life.
The above through tool wear and the resulting various phenomena, as well as the relationship between the phenomena to determine the service life of the tool, in addition, according to the machining surface quality, the grinding cost of the tool, the tool grinding time and other economic factors can also be used to measure the service life of the tool, in production practice, Sometimes the service life of the tool is also measured by the processing time and processing amount.
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