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本文研究蠕墨铸铁铣削加工的工艺技术,分析了切削参数对切屑形貌特征的影响规律,建立了基于切削参数的铣削力、粗糙度的线性回归经验公式,对比分析了铣削加工蠕墨铸铁(RU380)、灰口铸铁(HT300)、球墨铸铁(QT500)刀具的失效形式和失效机理,并给出了铣削加工蠕墨铸铁的推荐切削条件。结果表明:蠕墨铸铁铣削加工的切屑为较规则的螺旋管状,切屑颜色接近被加工材料初始色,且几乎不随切削参数变化而改变;高的切削速度和小的进给量能有效改善切屑背面褶皱和层积现象;切削深度对铣削力的影响最为显著,进给量的变化对粗糙度的影响相对明显,采用常规切削参数均能获得良好的粗糙度;蠕墨铸铁铣削刀具的失效机理为粘结磨损、氧化磨损和扩散磨损,并在其相互影响下导致刀具磨损失效,基本未出现崩缺等异常现象;水冷条件下铣削蠕墨铸铁,刀具寿命较低,且失效形式为崩缺失效,不利于安全生产及发挥刀具性能。
In this paper, the technology of vermicular cast iron milling is studied. The influence of cutting parameters on the morphology of the chip is analyzed. The empirical formula of linear regression of milling force and roughness based on cutting parameters is established. RU380), gray cast iron (HT300) and ductile iron (QT500), and gave the recommended cutting conditions for compacted vermicular cast iron. The results show that the chips of vermicular graphite cast iron are regular spiral pipe and the color of the chips is close to the initial color of the material to be processed, and almost does not change with the cutting parameters; high cutting speed and small feed can effectively improve the chip back Wrinkle and stratification. The effect of cutting depth on milling force is the most significant. The influence of feed variation on roughness is relatively obvious, and the roughness can be obtained by conventional cutting parameters. The failure mechanism of vermicular cast iron milling cutter is Bonding wear, oxidation wear and diffusion wear, and under the influence of each other, it leads to tool wear failure, and basically does not appear collapse and other anomalies; vermicular graphite iron milling under water cooling, the tool life is low, and the failure form collapse collapse , Is not conducive to safe production and play tool performance.