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Effect of deep cryogenic treatment on tool life of multilayer coated carbide inserts by shoulder milling of EN8 steel
Journal of the Brazilian Society of Mechanical Sciences and Engineering ( IF 2.2 ) Pub Date : 2021-07-10 , DOI: 10.1007/s40430-021-03100-7
R. Mahendran 1 , P. Rajkumar 1 , L. Nirmal Raj 1 , S. Karthikeyan 1 , L. Rajeshkumar 2
Affiliation  

High-strength materials are hard to machine with ordinary tools and necessitates tool inserts of high strength and hardness to machine them. One of the methods to improve the physical properties of an insert material is cryogenic treatment which involves the treating of materials at low temperatures. In the current experiments, two multilayer carbide tool inserts WS40PM and F40M were analyzed by cryogenically treating them. Three class of cutting tool inserts were taken for comparison: untreated, cryogenically treated and cryogenically treated and tempered (CTT). The microstructural changes were observed through scanning electron microscopy, and the change in microstructure of all classes of tool inserts was compared and contrasted. Hardness of the tool inserts was measured using Vickers microhardness tester, and the variation of crystallite size in tool inserts was examined through X-ray diffraction studies. Rate of tool wear (through flank wear) was observed by performing shoulder milling operation on the mild steel EN8 grade steel at constant velocity in a CNC vertical machining center using treated and untreated tool inserts. The results showcased the increase in insert hardness, microstructure and tool life of treated tools when compared with untreated tool inserts. Highest hardness was achieved for CTT tool inserts and was found to be 1142 HV for WS40PM and 1483 for F40M inserts, respectively. From the flank wear studies, F40M inserts experienced a wear of 203 µm and WS40PM inserts experienced 269 µm upon machining EN8 grade steel.



中文翻译:

深冷处理对EN8钢方肩铣多层涂层硬质合金刀片刀具寿命的影响

高强度材料很难用普通刀具加工,需要高强度和硬度的刀具刀片才能加工。改善插入材料物理性能的方法之一是低温处理,它涉及在低温下处理材料。在当前的实验中,通过低温处理对两种多层硬质合金刀具刀片 WS40PM 和 F40M 进行了分析。将三类切削刀具刀片用于比较:未处理、低温处理和低温处理和回火 (CTT)。通过扫描电镜观察显微组织变化,对比对比各类刀具刀片的显微组织变化。使用维氏显微硬度计测量工具刀片的硬度,并且通过 X 射线衍射研究检查了刀具刀片中微晶尺寸的变化。通过在 CNC 立式加工中心使用经处理和未经处理的刀具刀片以恒定速度对低碳钢 EN8 级钢进行方肩铣削操作,观察刀具磨损率(通过后刀面磨损)。结果表明,与未经处理的刀具刀片相比,经过处理的刀具的刀片硬度、微观结构和刀具寿命都有所增加。CTT 刀具刀片的硬度最高,WS40PM 刀片硬度分别为 1142 HV,F40M 刀片硬度为 1483。根据后刀面磨损研究,F40M 刀片在加工 EN8 级钢时磨损 203 µm,WS40PM 刀片磨损 269 µm。通过在 CNC 立式加工中心使用经处理和未经处理的刀具刀片以恒定速度对低碳钢 EN8 级钢进行方肩铣削操作,观察刀具磨损率(通过后刀面磨损)。结果表明,与未经处理的刀具刀片相比,经过处理的刀具的刀片硬度、微观结构和刀具寿命都有所增加。CTT 刀具刀片的硬度最高,WS40PM 刀片硬度分别为 1142 HV,F40M 刀片硬度为 1483。根据后刀面磨损研究,F40M 刀片在加工 EN8 级钢时磨损 203 µm,WS40PM 刀片磨损 269 µm。通过在 CNC 立式加工中心使用经处理和未经处理的刀具刀片以恒定速度对低碳钢 EN8 级钢进行方肩铣削操作,观察刀具磨损率(通过后刀面磨损)。结果表明,与未经处理的刀具刀片相比,经过处理的刀具的刀片硬度、微观结构和刀具寿命都有所增加。CTT 刀具刀片的硬度最高,WS40PM 刀片硬度分别为 1142 HV,F40M 刀片硬度为 1483。根据后刀面磨损研究,F40M 刀片在加工 EN8 级钢时磨损 203 µm,WS40PM 刀片磨损 269 µm。结果表明,与未经处理的刀具刀片相比,经过处理的刀具的刀片硬度、微观结构和刀具寿命都有所增加。CTT 刀具刀片的硬度最高,WS40PM 刀片硬度分别为 1142 HV,F40M 刀片硬度为 1483。根据后刀面磨损研究,F40M 刀片在加工 EN8 级钢时磨损 203 µm,WS40PM 刀片磨损 269 µm。结果表明,与未经处理的刀具刀片相比,经过处理的刀具的刀片硬度、微观结构和刀具寿命都有所增加。CTT 刀具刀片的硬度最高,WS40PM 刀片硬度分别为 1142 HV,F40M 刀片硬度为 1483。根据后刀面磨损研究,F40M 刀片在加工 EN8 级钢时磨损 203 µm,WS40PM 刀片磨损 269 µm。

更新日期:2021-07-12
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