Design The Tool For Rough Machining The Large Hydrogenated Cylindrical Shell And Researching On Its Cutting Performance

The characteristics of the heavy-duty cutting are that both the size and the weight of the parts are large (up to several hundred tons), as a result, the diameter of gyration of the large scale vertical lathe is about 10 meters. Compared with ordinary cutting, there are characteristics of difficult being clamped, big cutting depth, slow cutting speed and slow feed rate in the heavy cutting process. Therefore, the processing cycle of heavy cutting is long, tool life is short and the frequency of changing tool is fast.First, the problems appearing in heavy cutting process are introduced in the paper, and the significance of researching the heavy-duty turning tool is explained. And then the research status at home and abroad is summarized, and the main work of this article is also introduced.Second, the machinability of the material of the hydrogenated cylindrical shell which is 2.25Cr-1Mo-0.25V steel is researched in this article. Through the comparing cutting experiment, the cutting force, cutting temperature and the difficult and easy level of the chips'being broken which are among 2.25Cr-1Mo-0.25V steel, 45 steel and 1Cr18Ni9Ti stainless steel under the same cutting conditions are compared. According to the results, both the design idea of the new-style turning tool and the principle should be followed are put forward.Third, both the type and the performance of tool materials are introduced and analyzed. By analyzing and researching their performance and the chemical compatibility, physics compatibility and mechanics compatibility between the tool materials and shell material, the matrix material of turning tool is optimized.Fourth, on the basis of determining the tool's matrix material, the structural parameter of the heavy-duty turning tool was calculated and designed, and the tool size, shape of cutting edge and cutter angle and so on were included. Then whole design scheme of new-type heavy-duty turning tool was determined finally.Lastly, in order to verify the correctness and feasibility of the design, the cutting performance, tool life and the degree of damage of the new-type and original turning tools were compared in cutting experiment. And the optimal cutting parameters were summarized.