کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7176871 1466738 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cryogenic machining of porous tungsten for enhanced surface integrity
ترجمه فارسی عنوان
ماشینکاری کریوژنیک از تنگستن متخلخل برای بهبود یکپارچگی سطح
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
چکیده انگلیسی
Cryogenic machining of porous tungsten is being developed as an alternative sustainable process to current industry practice of machining plastic infiltrated workpieces. Eliminating the use of plastic infiltrant is contingent on the ability to control as-machined surface properties of porous tungsten. To this end, the influence of various machining parameters and cooling conditions on machining mechanisms, particularly as a function of cutting temperature, is explored. By employing modified polycrystalline diamond cutting tools, high speed cryogenic machining of porous tungsten by ductile shear was achieved. Cutting speeds of up to 400 m/min are possible with this novel approach, and very low surface roughness of Ra ≈ 0.4 μm is realized, at the expense of surface porosity. At low cutting speeds, rake angle has a key impact on surface morphology, with more negative rake angles increasing the amount of brittle fracture occurring on the machined surface and thereby increasing surface porosity. An excellent mix of open surface porosity and low surface roughness may be achieved at low cutting speeds of 20 m/min when a sharp edged cutting tool with a rake angle of −5° is used. Using a separate set of machining parameters for rough and finish machining may offer an optimum approach to realize economical cryogenic machining of porous tungsten.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Materials Processing Technology - Volume 229, March 2016, Pages 614-621
نویسندگان
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