In pole piece slitting process, quality of slitting disc blade directly affects pole piece slitting performance. Slitting machine needs to run for a long time, so it is necessary for 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 cutting process. Generally, 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 cutting edge. During continuous slitting process, stress on cutting edge is large and concentrated. Due to frequent extrusion, shearing, friction and cyclic crossover The effect of variable mechanical load is prone to fatigue micro-cracks in cutting edge area, and then under action of cyclic stress, it will expand along the side of disc cutter to center. When crack grows to a certain extent, stress reaches strength limit of tool material It will cause local micro-breakage of cutting edge of tool.
(2) Adhesive wear
Adhesives with squeezing marks can also be found in wear area of tool. These adhesives are formed by sticking of pole piece debris on tool. This is because the side of disc cutter is in contact with pole piece cutting surface, and there is a large contact pressure, so that part of cutting material is cold welded to side of disc cutter. These bonding layers continuously fall off during cyclic slitting process and then re-form. The fall off process may cause hard phase of tool to fall off, and aggravate wear process. This situation is easiest to form when slitting aluminum foil. Due to low melting point of aluminum, cutting chips and side of 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 tool, they often contain some extremely high hardness tiny hard points, which can engrave grooves on tool surface, which is abrasive wear.
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