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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)).
Machinability of Materials
Published in David A. Stephenson, John S. Agapiou, Metal Cutting Theory and Practice, 2018
David A. Stephenson, John S. Agapiou
Gray iron can be machined using coated or uncoated carbides, alumina and silicon nitride ceramics, or PCBN tooling [131–133]. It can also be finished turned using cermets. Coated carbides can be used for turning and milling at speeds up to 150 m/min Flood coolants are normally used with carbide tooling to reduce dust dispersal. Tool life on the order of 1000 or 2000 parts can be achieved with carbide tooling. Silicon nitride tooling is used in turning, milling, and boring at speeds between 800 and 1300 m/min. Hot pressed silicon nitride tools are used without coolants to prevent tool failures due to thermal shock. Chamfered edge preparations are normally used to prevent tool chipping, especially in interrupted operations. Tool life between 2,000 and 10,000 parts can be achieved with silicon nitride tooling. Depths of cut should be greater than the thickness of the cast layer; when this is not possible, alumina-based ceramic tooling should be used for enhanced wear resistance. PCBN tooling is used especially in milling and finish boring at speeds similar to those for silicon nitride. Coolants are often used to prevent dust dispersal and thermal expansion of the workpiece but is not required for acceptable tool life. Tool life of over 10,000 parts (often up to 50,000 parts) can be achieved with PCBN tooling. Negative rake cutting geometries are used for turning, boring, and milling operations with all these tool materials. Gray iron can be drilled using HSS, HSS-Co, or carbide drills. For HSS drills, the cutting speed is usually kept below 25 m/min to provide adequate tool life (>1000 parts). Micrograin carbide drills with through the tool coolant can be used to improve drill life (often to greater than 30,000 parts at a cutting speed of 80 m/min) and drilled hole quality [134–136].
Geometric Construction Tools
Published in Godfrey C. Onwubolu, Introduction to SOLIDWORKS, 2017
The Chamfer tool is used to create a chamfer in a model. Generally, a chamfer of 45° is common, but other angles could be used. Let us illustrate chamfering by considering an object having all sides horizontal or vertical. A chamfer is needed between the vertical and horizontal lines to the right of the object at an angle of 45° (see Figure 2.16).
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.
On the improvement in process performance of ceramic inserts during hard turning in MQL environment
Published in Materials and Manufacturing Processes, 2022
Namit Singh Bhadoria, Gaurav Bartarya
Round bars of EN31 steel (Dia. 30 mm), hardened to 60 ± 2 HRC, were used as test pieces. A Sialon based a chamfered and honed edge ceramic insert (Make: Seco, type: CNGN120408S-01020, CS100) was used with a compatible tool holder (Seco make, type- CCLNR2525M12). A chamfered and hone edge provides stability to the cutting process by making the tool mechanically strong.[2] Experiments were conducted on a well-kept rigid conventional Lathe (Make: Kirlosker, Model-1550), for the same machining length and with a fresh cutting edge each time.
A surface cracks detection method for nuclear fuel pellets using an improved fully convolutional network
Published in Journal of Nuclear Science and Technology, 2022
Xiaoqiang Liu, Wenbin Peng, Bin Zhang, Xinmiao Wang, Xiaofang Zhang, Wenjie Zhang, Yanjie Miao, Ge Wu, Chaoying Zhang
The fuel pellet is a tiny cylinder with a central hole, and is gray-black with a rough surface. The outer diameter is about 5.5 mm, and the height is about 8.5 mm. A chamfer is located at the junction of the end surface and the cylindrical surface. The width of the chamfer on the cylindrical surface is about 0.3 mm, and the angle is about 30°. A photograph and diagram with labeled dimensions are shown in Figure 1(a,b), respectively.