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Itec 240 Test 2 Notes
Terms in this set (92)
Surface cracking, due to oxidation and shrinkage stresses, which shows as repetitive mounding of an asphalt surface in a pattern resembling the hide of an alligator.
A small, semi-finished piece of metal that is rectangular, circular, or square in shape.
_____ are similar to billets except the cross-sectional area is greater than 36 sq in (230 cm2). _______ are usually further processed via rotary piercing, structural shape rolling and profile rolling.
a metal forming process in which metal stock is passed through one or more pairs of rolls to reduce the thickness and to make the thickness when the temperature of the metal is below its recrystallization temperature.
feature where rolls are thicker at its center than at its edges, due to roll bending.
a very thin sheet of metal, usually made by hammering or rolling a piece of metal.
Unit of thickness of a metal sheet or wire.
a metal forming process in which metal stock is passed through one or more pairs of rolls to reduce the thickness and to make the thickness uniform when the temperature of the metal is above recrystallization temperature.
A steel ______ is a facility which produces steel products from recycled scrap metal.
metal with a thickness greater than 6mm.
a metal forming process in which metal stock is passed through one or more pairs of rolls to reduce the thickness and to make the thickness uniform.
Factories that roll metal.
piece of metal that results from rolling.
a length of metal that is rectangular in cross-section. It is created directly from continuous casting or indirectly by rolling an ingot.
a metal rolling process used extensively in manufacturing industry to produce screws, bolts, and other fasteners.
Closed die forging
is the forming of complex-shaped parts from a metal semi-product between two engraved tools (dies) by hammering or pressing with a press.
_____ is a form of precision stamping in which a workpiece is subjected to a sufficiently high stress to induce plastic flow on the surface of the material.
is excess material attached to a molded, forged, or cast product, which must usually be removed. This is typically caused by leakage of the material between the two surfaces of a mold (beginning along the parting line) or between the base material and the mold (in the case of overmolding).
a manufacturing process involving the shaping of metal using localized compressive forces.
a process which incorporates the extruding and upsetting processes.
Open die forging
a manufacturing process involving the shaping of metal using localized compressive forces. Forging is often classified according to the temperature at which it is performed: "cold", "warm", or "hot" forging.
a forging process in which the dimensions of an item are altered using dies into which the item is forced.
a deformation process in which a billet is compressed between two dies in a press or a hammer.
extruded by welding chamber method
a form of internal cracking that results from a state of hydrostatic tensile stress at the centerline in the deformation zone in the die.
a process used to create objects of a fixed cross-sectional profile. A material is pushed or drawn through a die of the desired cross-section. is done at room temperature or near room temperature. The advantages of this over hot extrusion are the lack of oxidation, higher strength due to cold working, closer tolerances, good surface finish, and fast extrusion speeds if the material is subject to hot shortness.
a process used to create objects of a fixed cross-sectional profile. A material is pushed or drawn through a die of the desired cross-section.
defects that occur in the extrusion process that include surface cracking, pipe, internal cracking, surface lines.
A flow pattern that draws the surface oxides and impurities to the center of the product. Such a pattern is often caused by high friction or cooling of the outer regions of the billet.
a die having several openings for the extrusion of separate parts of an object later formed by the welding or fusing together of these parts.
The distinction between wire and ____ is somewhat arbitrary with WIRE being relatively smaller in cross-section.
A method of forming on the press brake in which two separate hems are formed together to form one part.
die where the melt stream is distributed around the mandrel by a cone which is supported by a ring of spokes.
metal drawn out into the form of a thin flexible thread or rod.
The __________ is the length of the arc of the neutral line between the tangent points of a bend in any material.
a manufacturing process that produces a V-shape, U-shape, or channel shape along a straight axis in ductile materials, most commonly sheet metal.
The tool in a drawing die that holds down the outer rim of the metal sheet as it is drawn into the die cavity.
a metalworking process to form the rough shape of a sheet metal workpiece.
deformation of metal wherein a raised edge forms on a metal part which has been machined.
distance between punch and die
A type of die that has the die block (matrix) mounted on a punch plate with perforators in the upper die with the inner punch mounted in the lower die set. An inverted type of blanking die that punches upwards, leaving the part sitting on the lower punch (after being shed from the upper matrix on the press return stroke) instead of blanking the part through. A__________ allows the cutting of internal and external part features on a single press stroke.
the process of taking burrs off of parts that have been machined by means of grinding or sanding.
a sheet metal forming process in which a sheet metal blank is radially drawn into a forming die by the mechanical action of a punch.
a metalworking process which uses tensile forces to stretch metal.
refers to the creation of an impression of some kind of design, decoration, lettering or pattern on another surface like paper, cloth, metal and even leather, to make a relief.
is the act of swiping sheet metal in a direction contrary to its previous position.
a sheet metal process where the edge is rolled over onto itself.
natural or man-made structures that have the geometry of a honeycomb to allow the minimization of the amount of used material to reach minimal weight and minimal material cost.
the process of efficiently manufacturing parts from flat raw material.
A shearing operation that cuts overlapping holes in sheet metal. _____ is used to create curved, non-linear cuts.
a machine tool for bending sheet and plate material, most commonly sheet metal.
A die containing a series of stations that perform one press operation after another in series. A _________ gradually forms a part as it moves through the die, and the last operation separates the part.
containers that are too difficult to draw it takes a second drawing.
also known as die cutting, is a process which cuts stock without the formation of chips or the use of burning or melting.
a shearing operation that cuts a large roll of material into narrower rolls. There are two types of slitting: log slitting and rewind slitting. In log slitting the roll of material is treated as a whole (the 'log') and one or more slices are taken from it without an unrolling/re-reeling process. In rewind slitting the web is unwound and run through the machine, passing through knives or lasers, before being rewound on one or more shafts to form narrower rolls.
action that occurs due to residual stress where a part wants to get back to its starting form before being bended or machined.
transfers sheet metal in a linier or circular path.
the process used commercially to produce the largest tonnage of metal powders.
mixing powders and powder-metallurgy processing. Increases physical and mechanical properties.
_________is generally performed at room temperature, and the elevated-temperature process of sintering is usually conducted at atmospheric pressure.
a result in mixing or mass transport, without requiring bulk motion.
utilizes either aqueous solutions or fused salts.
the weak metal part created after compacting in powder metallurgy. Sintering strengthens the ______ by fusing the blended materials.
The ability of an adhesive to be handled before it has completely cured. _________ allows a part to continue moving through the assembly line while the adhesive cures.
simply filling the holes, cracks and crevices within porous materials.
a process whereby a slug of a lower-melting point metal is placed against the sintered part and then the assembly is heated to a temperature sufficient to melt the slug.
a manufacturing process for producing parts by injecting material into a mold.
the process of blending fine powdered materials, pressing them into a desired shape or form (compacting), and then heating the compressed material in a controlled atmosphere to bond the material (sintering).
includes a variety of sheet-metal forming manufacturing processes, such as punching using amachine press or stamping press, blanking, embossing, bending, flanging, and coining.
a method for creating objects from powders, including metal and ceramic powders.
process by which the air pressure then pushes the plastic out to match the mold. Once the plastic has cooled and hardened the mold opens up and the part is ejected.
heating a part of an elevated temperature in a controlled environment, a process similar to the sintering employed in powder metallurgy.
a sheet of glass made by floating molten glass on a bed of molten metal, typically tin, although lead and various low melting point alloys were used in the past.
is a type of safety glass that holds together when shattered. In the event of breaking, it is held in place by an interlayer, typically of polyvinyl butyral (PVB), between its two or more layers of glass.
a suspension of colloidal ceramic particles in an immiscible liquid.
a technique for the mass-production of pottery, especially for shapes not easily made on a wheel. A liquid clay body slip(usually mixed in a blunger) is poured into plaster molds and allowed to form a layer, the cast, on the inside cavity of the mould.
a type of safety glass processed by controlled thermal or chemical treatments to increase its strength compared with normal glass. Tempering puts the outer surfaces into compression and the inner surfaces into tension. Such stresses cause the glass, when broken, to crumble into small granular chunks instead of splintering into jagged shards. The granular chunks are less likely to cause injury.
modified extrusion and molding process.
makes a shape and pour material to create the product
material is placed between 2 mold and pressure is applied to produce the product. Generally into a log like shape
component is coated in a layer of plastic.
constitutes the larger volume of plastic and turning it into powdering, pellet, and granulates.
Extrusion blow molding
Pressurizing the mold to move the materials to the outside of the mold
the resin and fibers are combined at the tie of curing to develop a composite structure
brushed materials are shaped and molded by a roller
combination of compression and transfer molding
sharp tubular piece.
small balls of plastic used in molding process
addition to powders liquid polymers used in rotational molding. pvc
fiber reinforced plastics pre-impregnated with resins
long parts with various uniform cross-sections are made continuously to reinforce plastics.
Vacuum bag molding
prepregs are laid in a mold are laid in a mold for the desired shape and laid over with a plastic bag to create a vacuum.
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