In the pole piece slitting process, the quality of the slitting disc blade directly affects pole piece slitting performance. The slitting machine needs to run for a long time, so it is necessary for the slitting blade to have good mechanical properties, such as hardness, manufacturing technology, and wear resistance. Disc cutter has a certain life span during continuous operation, and cutter life needs to be managed in the cutting process. Generally, the main failure mode of pole piece disc cutter is tool wear, which includes:
(1) Fatigue failure
Pole piece slitting disc cutter has lateral pressure. Upper and lower cutters overlap each other on side of the cutting edge. During the continuous slitting process, stress on the cutting edge is large and concentrated. Due to frequent extrusion, shearing, friction, and cyclic crossover, The effect of the variable mechanical load are prone to fatigue micro-cracks in the cutting edge area, and then under the action of cyclic stress, it will expand along the side of the disc cutter to center. When crack grows to a certain extent, stress reaches the strength limit of tool material It will cause local micro-breakage of the cutting edge of the tool.
(2) Adhesive wear
Adhesives with squeezing marks can also be found in the wear area of the tool. These adhesives are formed by sticking pole piece debris on the tool. This is because the side of the disc cutter is in contact with the pole piece cutting surface, and there is a large contact pressure, so that part of the cutting material is cold welded to the side of the disc cutter. These bonding layers continuously fall off during the cyclic slitting process and then re-form. The fall-off process may cause the hard phase of the tool to fall off, and aggravate the wear process. This situation is easiest to form when slitting aluminum foil. Due to the low melting point of aluminum, cutting chips and the side of the tool stick together to cause tool wear and shorten life.
(3) Abrasive wear
Although the hardness of cutting chips and pole pieces is lower than the hardness of the tool, they often contain some extremely high hardness tiny hardpoints, which can engrave grooves on the tool surface, which is abrasive wear.
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