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Dimensioning
Published in Ken Morling, Stéphane Danjou, Geometric and Engineering Drawing, 2022
A chamfer is a bevelled edge, usually added to two adjacent faces to avoid sharp edges. They are used, for example, to ensure the function of two mating parts, to avoid injuries and to prevent damage to the part. As a rule, a chamfer is created at an angle of 45°. However, other angles might be necessary for specific applications. When dimensioning a chamfer, the length of the offset and the angle shall be provided. As long as the angle is 45°, the presentation can be simplified according Figure 7.19 (a). When drawing space is limited or the value for the offset is very small, the dimension can be given with a leader line as shown in Figure 7.19 (b). Whenever the angle is unequal 45°, the chamfer shall be conventionally dimensioned, i.e. indicating the angle and separately the offset or alternatively the chamfer diameter (compare Figure 7.19 (c)).
Cutting Tools
Published in David A. Stephenson, John S. Agapiou, Metal Cutting Theory and Practice, 2018
David A. Stephenson, John S. Agapiou
Generally, a reamer has a chamfer at the outer corner of the cutting edges to guide it into the hole. The chamfer angle, shown in Figure 4.78, is complementary to the lead angle used in turning and milling tools. A standard chamfer of 45° is used for most applications. However, a chamfers between 30° and 45° can be used for steel, while chamfers up to 20° are used for cast iron and aluminum. When the reamer is being used as a boring tool (with a fixed holder), a large initial chamfer angle followed by a secondary angle smaller than 20° is used so that the tool acts as an end cutting tool (as shown in Figure 4.82), which further improves hole size and surface finish by a scraping action. A reamer with a 45° or smaller primary chamfer will not completely correct hole location and straightness errors. Higher chamfer angles result in reduced tool life when cutting ferrous materials, especially for interrupted cuts, due to rapid tool corner wear and a higher susceptibility to corner chipping. The chamfer angle also affects the rake angle. Left-hand reamers are often designed with a 30° chamfer, which results in a positive rake angle. The length of the secondary chamfer is very critical to the tool performance; it can generate chatter when it is too long depending on its relief angle, the workpiece material, and part-fixture stiffness. The chamfer width along the cutting edge should be larger than the depth of cut. Smaller secondary and primary chamfer angles and longer secondary lengths result in better surface finish.
Features
Published in Godfrey C. Onwubolu, Introduction to SOLIDWORKS, 2017
A chamfer is a slanted surface that is added to the corner of a part. Chamfers are usually manufactured at 45°, but any other angle may be used. There are usually three ways of defining a chamfer: (1) an angle and a distance (2.5 × 45°), (2) by two distances (2.5 × 2.5), or (3) by a vertex, as shown in Figures 3.49 through 3.51.
Simulations for MHD mixed convection in a partially heated lid-driven chamfered enclosure
Published in Numerical Heat Transfer, Part A: Applications, 2023
Bisma Akram, Naeem Ullah, Sohail Nadeem, Sayed M. Eldin
The present study involves the mixed convection flow in a chamfered square-shaped adiabatic cavity with a moveable lid. It is assumed that the bottom horizontal boundary is partially at high while the upper horizontal edge is at low temperature. Further, it is also considered the implication of inclined Lorentz forces on flow field and thermal profiles. A numerical solution is performed by utilizing the Galerkin finite element algorithm. Results for different parameters via streamlines, isotherms, and line graphs are observed. Such physical model has not yet been addressed, and we are confident that our results will be applicable to wide range of engineering and industrial applications. Particularly in areas where chamfered enclosures are designed to optimize the flow of coolant or fluid around heat-generating components. The chamfered edges help to direct and improve the flow, enhancing heat transfer and cooling efficiency. The chamfered design minimize flow resistance and turbulence, resulting in improved thermal management This design feature effectively mitigates the formation of hotspots, ensuring optimal performance and reliability of electronic devices. The combination of chamfered enclosures and inclined magnetic fields offers valuable applications in advanced manufacturing processes like additive manufacturing or metal casting. By controlling the fluid flow and heat transfer, this approach can enhance material solidification, reduce defects, and improve overall product quality. The article is put together in the following sections and subsections.