Abstract
Cobalt-rich crusts cutting method of cutter with water jet is proposed to reduce cutter impact load. Finite element model of cutter cutting cobalt-rich crusts with water jet was established and surface initial crack forming conditions of cobalt-rich crusts were simulated. Simulation results show when water jet pressure is less than compressive strength of cobalt-rich crusts and water jet action point is not overlap with cutter action point, water jet can't reduce the minimum cutting force of cutter, which is used to form initial crack. When water jet action point is overlap with cutter action point, water jet can reduce the minimum cutting force effectively. When water jet pressure is greater than cobalt-rich crusts compressive strength, water jet can generate initial crack on cobalt-rich crusts surface alone. Experiments of cutter cutting cobalt-rich crusts simulation material with water jet were carried out. Experimental results show when water jet action point is not overlap with cutter action point, water jet can't reduce the maximum impact load of cutter, but it can reduce the root mean square of impact load. When water jet action point is overlap with cutter action point, water jet can reduce the maximum impact load dramatic and the root mean square of impact load is decreased accordingly. http://dx.doi.org/10.5755/j01.mech.17.4.580
Highlights
As land mineral resources are exhausting, many countries are paying attention to deep sea resources development and utilization
When water jet action point is overlap with cutter action point, Maximum equivalent stress (MES) of cobaltrich crusts is increased compared with cutter cutting alone, which shows using of water jet can increase cutter cutting performance obviously in the current conditions
When water jet pressure is less than simulation materials compressive strength and water jet action point is not overlap with cutter action point, maximum impact load of cutter during cutting simulation materials is almost the same compared with cutter cutting simulation materials alone, root mean square of impact load is decreased by 10%
Summary
As land mineral resources are exhausting, many countries are paying attention to deep sea resources development and utilization. In order to improve cutting efficiency, cobalt-rich crusts vibration cutting method is proposed. In this method, an eccentric mechanism is amounted in spiral drum. Impact load and vibration of spiral drum are inevitable when cutter cutting deep sea cobalt-rich crusts. Method of cutter cutting cobalt-rich crusts with water jet is proposed in this paper to improve the safety of mining system and to decrease impact load of cutter. In this method, high pressure water jet is used to assist cutter cutting cobalt-rich crusts. In order to obtain the working mechanism of water jet assists cutter cutting cobalt-rich crusts and the action law of water jet parameters and its cutting performance, the process of cutter cutting cobalt-rich crusts with water jet was studied with simulation calculation and experiment test[8, 9]
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