منابع مشابه
Resharpening of the twist drill bits
To get a good performance from a drill bit the sharpening must be done correctly, this means that all the angles and the lengths of the edges must be exactly as established and will not occur during the grinding edge of the material structural modifications. To execute the correct sharpening are therefore required special equipment and dedicated grinding machines. The geometric elements to cons...
متن کاملEffect of eccentricity of twist drill and candle stick drill on delamination in drilling composite materials
Drilling is the most frequently employed operation of secondary machining for fiber-reinforced materials owing to the need for structure joining. Delamination is one of the serious concerns during drilling. Practical experience shows that an eccentric twist drill or an eccentric candle stick drill can degrade the quality of the fiber reinforced material. Comprehensive delamination models for th...
متن کاملSimulation-based twist drill design and geometry optimization
Designing a high-performance twist drill is difficult due to the complex relationship between drill geometry and numerous and conflicting design goals. Earlier approaches of computer-aided twist drill design are limited to only few design aspects. This article presents a new holistic method of using computing power for twist drill design and optimization. A complete drill geometry model is used...
متن کاملComputerized Tomography and C-scan for Measuring Drilling-Induced Delamination in Composite Material Using Twist Drill and Core Drill
Delamination is one of the most concern defects in drilling of composite material. Delamination depends on the factors such as feed rate, tool geometry and wear. The mechanics of drilling composite materials has been examined along with the quality of the hole and the effect of tool design parameters. The capacity of computerized tomography (CT) showing sample cross-section in a nondestructive ...
متن کاملTranexamic Acid for Treatment of Residual Subdural Hematoma After Bedside Twist-Drill Evacuation.
BACKGROUND Management of nonemergent, nonacute subdural hematomas (SDHs) ranges from observation to burr-hole evacuation or craniotomy, but recurrence rates are high. We evaluated the safety and efficacy of tranexamic acid (TXA) for the treatment of residual SDHs after bedside twist-drill evacuation. METHODS We performed a retrospective analysis of a prospectively maintained database from Nov...
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ژورنال
عنوان ژورنال: Manufacturing Technology
سال: 2012
ISSN: 1213-2489,1213-2489
DOI: 10.21062/ujep/x.2012/a/1213-2489/mt/12/2/281