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A grommet is a ring or edge strip inserted into a hole through thin material, typically a sheet of textile fabric, sheet metal or composite of carbon fiber, wood or honeycomb. Grommets are generally flared or collared on each side to keep them in place, and are often made of metal, plastic, or rubber. They may be used to prevent tearing or ...
Curling is a sheet metal forming process used to form the edges into a hollow ring. Curling can be performed to eliminate sharp edges and increase the moment of inertia near the curled end. [1] Other parts are curled to perform their primary function, such as door hinges.
Hemming and seaming are two similar metalworking processes in which a sheet metal edge is rolled over onto itself. Hemming is the process in which the edge is rolled flush to itself, while a seam joins the edges of two materials. [1] Hems are commonly used to reinforce an edge, hide burrs and rough edges, and improve appearance. [1]
Metal burr extending beyond the edge of the cut piece, view on the cut face (top) and from the bottom (bottom) A burr is a raised edge or small piece of material that remains attached to a workpiece after a modification process. [1] It is usually an unwanted piece of material and is removed with a deburring tool in a process called deburring.
A sharp edge, strength, and durability are ideal, but a sharp edge is not very strong or durable, so blades for metal work tend to be square-edged rather than knife-edged. Typical workpiece materials include aluminum, brass, bronze, and mild steel because of their outstanding shearability ratings.
In classical antiquity, Greek scabbards often had ornamental metal fittings, characteristic of the Iron Age. [5] The Roman army used scabbards to a great extent with short baldrics, carrying their swords quite high up. [6] Japanese blades typically have their sharp cutting edge protected by a wooden scabbard called a saya. [7]
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