IME 341 Manufacturing Engineering Review: Homework Sets 5-12

Comprehensive vocabulary flashcards covering metal forming (extrusion, drawing), powder metallurgy, ceramics, glass, polymers, composites, traditional machining operations, tooling mechanics, and abrasive processes based on IME 341 Homework Sets 5 through 12.

Extrusion (of Metals)

A metal forming process that pushes metal by forcing it through a shaped die opening to produce a part with a fixed or constant cross section.

Indirect Extrusion

An extrusion process that utilizes a hollow ram and die opening to force metal through in the opposite direction of the ram movement, reducing friction and yielding higher speeds, improved surface quality, and a consistent grain structure.

Hydrostatic Extrusion

A metal forming process that applies hydraulic fluid pressure to force a billet through a die, achieving uniform deformation.

Impact Extrusion

The fastest extrusion process, utilizing a punch force to rapidly shape metal into specific hollow forms such as cans and tubes.

Wire Drawing

A bulk deformation forming process that reduces the cross-sectional diameter of a wire while increasing its length by pulling it through a die.

Deep Drawing

A sheet metal forming process in which sheet metal is radially drawn into a forming die cavity; it is classified as 'deep' when the depth of the part exceeds its diameter.

Powder Metallurgy (PM)

A manufacturing process that turns metal into small particles, compacts the powder into a rigid die under extreme pressure, and heats it below its melting point to bind the particles together.

Sintering

A thermal process that heats compacted metal powder to a temperature just below its melting point, causing the particles to fuse and bond together.

Green Part

A compacted powder metallurgy component prior to sintering that has taken its shape but possesses relatively low mechanical strength.

Roll Densification

A mechanical compression process applied to sintered parts to eliminate surface porosity, thereby enhancing the component's ability to resist fatigue and endure contact stresses.

Ceramic

An inorganic, non-metallic, heat-resistant crystalline material engineered for functional industrial applications.

Glass

An inorganic, non-crystalline (amorphous) transparent solid with a disordered atomic structure produced by heating silica sand until it completely melts.

Ceramic Slip Casting

A ceramic forming technique in which a liquid clay suspension (slip) is poured into a porous plaster mold, allowing liquid to absorb while a solid layer forms.

Glass Transition Temperature ($T_g$)

The temperature range at which an amorphous glass material transitions from a rigid, brittle state into a softer, flexible, and significantly lower-viscosity superplastic state.

Thermoplastic Polymer

A class of polymers that melt when exposed to heat and solidify upon cooling, allowing them to be repeatedly remelted and reshaped.

Thermosetting Polymer

A category of polymers that cure through irreversible chemical bonding, producing a rigid cross-linked network that cannot be remelted without thermal degradation.

Elastomer

A polymeric material characterized by high flexibility and the capability to undergo large amounts of reversible elastic deformation under applied loads.

Hand Layup

A low-cost composites manufacturing technique that involves manually positioning reinforcement fabrics into an open mold and applying liquid resin.

Rotational Molding

A polymer processing method where powdered plastic resin inside a hollow mold is heated while rotating biaxially, coating the interior walls to produce hollow articles upon cooling.

Blow Molding

A manufacturing method where heated thermoplastic is inflated inside a mold cavity via compressed air to form hollow components such as bottles and fuel tanks.

Compression Molding

A molding process wherein a preheated charge of polymer is placed directly into an open, heated mold cavity, closed with an upper plug, and compressed to fully fill the cavity.

Thermoforming

A polymer manufacturing process that utilizes heat, vacuum, and pressure to form a flat thermoplastic sheet over the contours of a mold cavity.

Pultrusion

A continuous composite manufacturing technique where fibers are pulled through a resin bath and a heated die to form parts with a straight, constant cross section.

Filament Winding

A process for manufacturing hollow composite structures by winding resin-impregnated continuous fibers under tension onto a rotating mandrel.

Resin Transfer Molding (RTM)

A composite processing method wherein liquid resin mixed with a catalyst is injected into a closed mold containing a dry or semi-dry fiber preform.

Machining Operation

A subtractive manufacturing process that removes excess material in the form of chips from a workpiece to produce desired geometries, close tolerances, or refined surface finishes.

Turning

A machining operation carried out on a lathe where the workpiece rotates against a stationary single-point cutting tool feeding parallel to the rotation axis.

Boring

A machining operation used to enlarge and refine the internal diameter of a hole that has previously been drilled or cast.

Milling

A machining process that utilizes a rotating multipoint cutting tool moved relative to a workpiece to remove material.

Broaching

A machining process employing a long, toothed cutting tool that moves linearly against the workpiece to generate non-circular holes, slots, notches, or keyways in a single pass.

Reaming

A sizing and finishing operation that slightly enlarges a pre-existing hole to attain accurate dimensions and an improved surface finish.

Tapping

A hole-finishing operation that cuts internal screw threads into an existing cylindrical hole using a hard, fluted tool called a tap.

Chip Thickness Ratio

The ratio between the uncut chip thickness prior to machining ($t_0$) and the chip thickness measured after separation from the workpiece ($t_c$).

Rake Angle

The angle formed by the cutting tool's rake face relative to a plane perpendicular to the cutting direction, controlling chip flow and cutting forces.

Feed Rate

The speed at which the cutting tool advances along or into the workpiece, typically expressed as distance per revolution in turning and boring.

Taper Turning

A lathe machining operation in which the cutting tool moves at an angle to the rotational axis to produce a continuous, gradual change in diameter.

Profiling (Contour Turning)

A lathe turning process where the single-point tool traverses a non-linear, contoured path to produce complex profiles, diameters, or grooves.

Knurling

A lathe operation where hardened rollers press or cut a pattern of straight, angled, or cross-hatched textured lines onto a cylindrical surface for enhanced grip or aesthetics.

Gun Drilling

A specialized drilling operation using a long, slender, single-flute drill equipped with high-pressure internal coolant delivery to produce deep, straight, and precise holes.

Peripheral Milling

A milling operation where the axis of tool rotation is parallel to the machined surface, and cutting occurs primarily along the peripheral teeth of the cutter.

Face Milling

A milling method where the axis of the cutter is mounted perpendicular to the workpiece surface, machining predominantly with the face teeth of the tool.

End Milling

A versatile milling process using a cylindrical cutter possessing active cutting edges on both its periphery and flat tip to create shoulders, slots, and contoured cavities.

Built-up Edge (BUE)

An accumulation of workpiece material that welds or adheres to the cutting tool's rake face and tip as a result of high pressure, high cutting temperatures, and chemical affinity.

Chatter

Uncontrolled relative vibrations occurring between the cutting tool and the workpiece during machining, producing visible wave marks and poor surface finishes.

Gear Hobbing

A continuous gear-cutting process that uses a rotating, screw-shaped threaded cutter (hob) to generate gear teeth or sprockets into rotating cylindrical blanks.

Grinding

An abrasive machining operation utilizing a bonded abrasive wheel as a multipoint cutting tool, where individual abrasive grains shear microscopic chips from the surface.

Superabrasives

A class of exceptionally hard and wear-resistant abrasive materials, primarily comprising synthetic diamond and cubic boron nitride (CBN).

Grit Size

A standard numerical designation indicating the size of abrasive particles, determined by the screen mesh size per linear or square inch; higher grit numbers denote finer abrasive grains.

Specific Energy (in Grinding)

The total mechanical energy expended to cut and remove a unit volume of metal during a grinding operation.

Wheel Dressing

The maintenance process of conditioning a grinding wheel to fracture and remove dulled or loaded abrasive grains, restoring sharpness, trueness, and cutting capacity.

Traverse Grinding

A grinding technique where the workpiece reciprocates or feeds longitudinally along its length past the face of the grinding wheel.

Plunge Grinding

A grinding method in which the grinding wheel feeds radially into the cylindrical or flat workpiece without longitudinal traverse movement.

Creep Feed Grinding

An abrasive grinding method that utilizes extremely slow traverse feed rates combined with exceptionally deep depths of cut to achieve high material removal rates in difficult-to-machine alloys.

Centerless Grinding

An external cylindrical grinding method where the workpiece rests on a work rest blade between a grinding wheel and a regulating wheel rotating in the same direction at different speeds without mechanical centers.

Ultrasonic Machining (USM)

A non-thermal, non-conventional subtractive process that removes material from hard and brittle workpieces through high-frequency, low-amplitude tool oscillations in the presence of an abrasive slurry.

Honing

An internal abrasive sizing and finishing operation that utilizes bonded abrasive sticks mounted in an expanding mandrel to generate precise bore geometries and a cross-hatched surface pattern.

Lapping

A precision surface-finishing process where two surfaces are rubbed together using a loose abrasive slurry between them to produce ultra-smooth, flat, or contoured surfaces.