Abstract
Modifying the piercing punch profile may have a positive effect on the belt perforation process. Using the proper shape of the tool may reduce the perforation force and improve the quality of the holes. However, complex geometry of the punch can also cause an adverse stress distribution, which leads to a faster tool wear. In the presented paper, several different piercing punch profiles were tested using FEM analyses in ABAQUS and the obtained stress distributions along its cutting edges were analyzed. For the selected group of the piercing punches, the influence of variable geometrical features (a radius of rounding, an angle of chamfering or a depth of the bowl) on the stress distribution were also shown. Based on the results, it is possible to predict how modifying the punch profile will affect the shortening of the tool life, compared to the basic flat-end cylindrical piercing punch. The following research can be useful in the design process of the punching tools used for vacuum conveyor belts perforation.
Highlights
Due to the variety of the construction, and as a result the mechanical properties of the polymer composite belts, which are subject to the perforation process (Fig. 1), it is very difficult to design the universal tool for each type of belt [1,2,3]
The presented research proved that concave profiles of piercing punches should be considered as a possible effective tool for composite belt punching
The stress distribution analyses showed that the spherical bowl punches may be characterized by a longer tool life since they have a more advantageous stress distribution, which means that despite slightly higher peak perforation force they are still considered as an effective punch profile for polymer composite belts
Summary
Due to the variety of the construction, and as a result the mechanical properties of the polymer composite belts, which are subject to the perforation process (Fig. 1), it is very difficult to design the universal tool for each type of belt [1,2,3]. By combining it with proper process parameters, it should greatly improve the manufacturing process and yield both economic and technical benefits. This is why the presented research is important for both the industrial and scientific approach to the subject. The paper ends with a short summary in which the main conclusions are stated
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