دراسة تأثير الشكل الهندسي لمقدمة بريمة الثقب العميق على خواص الثقوب المنتجة

عباس, تحسين فاضل; التورنجي, محمد جواد; يحيى, منام اكرم

doi:10.30684/etj.26.7.15

	دراسة تأثير الشكل الهندسي لمقدمة بريمة الثقب العميق على خواص الثقوب المنتجة
Engineering and Technology Journal
Article 1, Volume 26, Issue 7, 2008, Pages 313-323 PDF (185.88 K)
DOI: 10.30684/etj.26.7.15
Authors
تحسين فاضل عباس; محمد جواد التورنجي; منام اكرم يحيى
Abstract
The term deep hole originally reffered to hole depth over (5* diameter) Deep hole drilling is a collective name for method for machining both short and deep holes. In deep hole drilling cutting fluid supply and chip transport play an important role in machining of hole depths of more than (100*diameter). The cutting tip geometry has a significant effect on a drills performance and on the quality of the machined holes by effecting on chips shape and thickness, distribution of the cutting forces, and on the flow of the cutting fluid at the cutting edge. The gun drill is normally divided in three parts: 1.Drill tip 2. Shank. 3. Driver. Depending on the application, the most common tool tip material is C2 carbide, which is one of the harder grades. This paper deals with expermental effect of gundrill tip geometry on the following properties of the hole: Hole straightness , Error shape in roundness , Dimension tolerance and Surface roughness. According to improvements of gun drill tip geometry in this work, the deep drilled holes properties are significantly improved with the following results : Hole straightness ( 7 μm) , Error shape in roundness ( 5 μm) , Dimension tolerance ( 7 μm) and Surface roughness ( Ra 1.2 μm).

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