The Wear Resistant Research Of Cutter Suction Dredge

Practice shows that, the dredger cutter’s main failure mode is abrasive wear,reamer cutter fracture in river dredging process. The failure of dredgercutter severely decreases the work efficiency of the dredger, leading to theemergence of losing a large number of materials. Dredger cutter is mainly bearinggravel wear, impact of sediment. At present, the domestic reamer cutter enjoys poorwear resistance, short service life, frequent replacement, restricts the development ofdredging industry.In my paper, systematic analysis of the factors affecting wear type. Accordingto the wear of cutter, wear regularity and working conditions，I put forward twokinds of experimental scheme. First, manufacturing a composite reamer, which canmeet the hard surface and tough inside, used in poor working condition environment.Next, manufacturing a HLC type cutter which meet the soil layer of soft conditions.First of all, develop a new cutter component to improve the wear resistance,hardness and toughness by changing the composition of the reamer (known as HLCreamer). In order to analyze the performance of the material, we should draw up aheat treatment process for materials. Choose seven temperature intervals forquenching to ensure the best quenching temperature range, they are820℃,840℃,860℃,880℃,900℃,920℃,940℃900℃,920℃and940℃. For temperingtemperatures, we choose five temperature numbers for experiment to get the besttempering interval, they are150℃,180℃,210℃,240℃and270℃. We choose fourtempering temperatures in the impact test, they are240℃,300℃,350℃and400℃.We can get the best experimental data from the analysis of experimental results. Thenewly developed HLC cutter gets the highest hardness at the quenching temperaturebetween880℃and900℃. In order to get the further number of the quenchingtemperature, we choose quenching temperature890℃for a set of experiments. Atthis temperature, the material’s hardness valve is51.2HRC, getting the maximumhardness. So we choose890℃as the best quenching temperature. The besttempering temperature is240℃, at this temperature, the material’s hardness value is50.8HRC higher than the standard sample cutter4.3HRC. In the heat treatment of 890℃(quenching temperature)+240℃(tempering temperature), the material get thebest hardness, wear-resistance and impact energy. The metallographic structure ofmaterial shows that: material’s tempering temperature at240℃, the organization ofthe material is best, it’s composed of martensite and a small amount of residualaustenite microstructure, material’s structure is evenly distributed. The material’smainly impact fracture is dimple and cleavage step, enjoying good impact toughness.Furthermore, I would make a very high strength and toughness material atthe heart of cutter tooth department, spraying a high performance wear resistancematerial on the surface. The main components of spray welding powder areNi60A+25%WC and Ni60A+35%WC. In the process of spray welding experiment,we can deposit a layer of wear-resistant in the cutter surface, which can increase thehard phase particles, wear resistance of the surface and enjoy good toughness(known as composite reamer).In this way, it can be used better at poor workingconditions. Both comparisons, integral cutter teeth with better prospects fordevelopment.