Manufacturing Technology and Advanced Production Processes

Comprehensive flashcards defining key terminology, advanced machining concepts, casting parameters, and manufacturing technology principles covered in the lecture notes.

Process Planning

The systematic determination of the methods and sequence by which a component is manufactured, translating part design requirements into detailed manufacturing instructions based on analysis of materials, machine tools, operations, and cutting conditions.

Group Technology (GT)

A manufacturing philosophy that groups parts and machine tools based on geometric shapes, sizes, and operational similarities to reduce lead times, minimize material handling, and improve production output.

Part Family

A collection of individual parts that share similarities in geometric shape, dimensions, and manufacturing operation sequences.

Production Flow Analysis (PFA)

A group technology analysis method that determines part families and machine groupings by analyzing the sequence of operations and routing sheets during fabrication.

Hybrid Coding

A classification and coding scheme used in group technology that integrates both monocodes (hierarchical codes) and polycodes (attribute codes) into mixed codes.

Industrial Robot

A reprogrammable, multifunctional manipulator designed to move materials, parts, tools, or specialized devices through variable programmed motions to perform diverse tasks.

Basic Elements of an Industrial Robot

The essential functional assemblies of a robotic system, including the mechanical structure (manipulator arm), the on-board control regulating unit, and the power drive unit.

Bit

The primary abbreviation for a binary unit, representing the smallest elementary unit of digital information in computer and numerical control systems.

G00 Code

A standard preparatory Part Programming G-code designating rapid, point-to-point non-cutting positioning mode of machine tool axes.

Automatic Tool Changer (ATC)

A motorized CNC subsystem that stores and automatically transfers cutting tools between a tool storage magazine and the machine spindle during machining cycles.

Fixed Zero

A permanent origin reference location on a CNC machine table, typically situated at the left-hand lower corner of the worktable.

Faraday's Law

The electrochemical relationship governing electrochemical machining (ECM), stating that the mass of metal dissolved at the anode is directly proportional to the electrical charge passed through the electrolyte.

Electrochemical Machining (ECM)

An advanced non-contact machining process where workpiece material is removed atom-by-atom via anodic dissolution into a flowing electrolytic solution, producing negligible tool wear regardless of workpiece hardness.

Brine Solution

An aqueous sodium chloride solution utilized as the electrically conductive electrolyte medium in electrochemical machining processes.

Ultrasonic Machining (USM)

A mechanical non-thermal machining process utilizing high-frequency acoustic wave vibrations and abrasive slurry bombardment to erode brittle and hard workpieces.

Piezoelectric Effect

The physical mechanism utilized by ultrasonic transducers to convert high-frequency electrical alternating current into high-frequency mechanical longitudinal vibrations.

Boron Carbide (in USM)

A hard abrasive material that provides the maximum metal removal rate when ultrasonically machining tungsten carbide workpieces.

Transducer (in USM)

A device positioned within an ultrasonic machining tool head that converts incoming high-frequency electrical impulses into mechanical vibrations.

Abrasive Jet Machining (AJM)

A material removal process where fine abrasive particles are entrained in high-velocity gas or air and directed through a nozzle to erode target workpieces via micro-chipping.

Investment Casting

A precision casting method utilizing an expendable wax pattern coated in refractory slurry to produce complex components with close dimensional tolerances and smooth surface finishes.

Sand Slinger

A foundry machine that throws moulding sand rapidly into a flask using a high-speed rotating impeller, producing sand moulds with uniform packing density.

Honeycombing (Sponginess)

A casting defect characterized by the presence of numerous small gas cavities or voids clustered in close proximity within the body of a solidified casting.

Drossing

The chemical formation and accumulation of metal oxides and impurities floating as scum on the surface of molten metal in foundry practice.

Cold Shuts

A casting defect appearing as a discontinuity or line of unfused metal, occurring when two opposing molten metal streams meet at temperatures too low to properly coalesce.

Hot Tears

Internal or external ragged fractures in a casting caused by tensile stress build-up and mechanical restraint preventing natural volumetric shrinkage during solidification.

Radiography

A non-destructive volumetric testing technique using penetrating X-rays or gamma rays to reveal hidden internal casting flaws such as cracks, porosity, and hot tears.

Dye Penetrant Test

A non-destructive testing method that relies on capillary action to locate open surface and near-surface cracks in non-porous and non-magnetic materials.

Pattern Maker's Scale

A specialized measuring ruler graduated proportionally larger than standard dimensions to automatically account for pattern shrinkage allowances of cooling alloys.

Core Print

An added projection on a pattern that leaves a seating recess in the sand mould to support, orient, and secure a core in place.

Core

A preformed sand or refractory insert placed inside a mould cavity to produce internal cavities, hollow passages, or recesses in a final casting.

Loose Piece Pattern

A multipart pattern containing removable segments, utilized when overhangs or undercuts prevent direct withdrawal of a single-piece pattern from the sand mould without tearing the walls.

Red Pattern Marking

The standardized pattern color code indicating surfaces that are to be machined post-casting.

Drag

The lower or bottommost section of a split sand moulding flask.

Cope

The upper or topmost half of a split sand moulding flask.

Cheek

The intermediate or central section positioned between the cope and drag in a three-part moulding flask assembly.

Chaplets

Small metal supports placed between a mould wall and core to prevent sagging or displacement of the core caused by the buoyant force of incoming molten metal.

Chills

High thermal conductivity metallic inserts placed along mould walls to accelerate localized cooling rates and promote directional solidification.

Loam Sand

A high-plasticity moulding mixture composed of approximately $50\%$ clay and $18\%$ moisture blended into a mortar-like paste used for sweep-moulding large cylindrical castings.

Dilatometer

A laboratory testing device used in foundry sand control to measure thermal expansion and determine the hot strength of moulding sand at elevated temperatures.

Sprue

The vertical channel or down-conduit through which molten metal is poured to travel from the pouring basin into the runner and mould cavity.

Gate (Ingate)

The restricted opening through which liquid metal is directed from the runner channel into the casting cavity at a controlled, uniform rate.

Parting Sand

A non-adhesive, clay-free sand dusted over pattern surfaces and mould parting planes to prevent green sand from adhering to the patterns or opposing mould halves.

Centrifugal Casting

A casting method where molten metal is poured into a rapidly rotating cylindrical mould, relying on centrifugal force to create hollow cylindrical components without the use of cores.

Hot Chamber Die Casting

A high-pressure die casting process where the melting crucible is an integral part of the machine, restricted to casting low-melting-point non-ferrous alloys such as zinc, tin, and lead.

Cold Chamber Die Casting

A high-pressure die casting method where molten metal is separately ladled into an unheated shot sleeve before hydraulic injection, designed for casting higher-melting-point alloys like aluminum and brass.

Gear Hobbing

A continuous gear generation process employing a worm-like cutting tool (hob) that continuously rotates synchronously with the gear blank, cutting multiple teeth faster than conventional form milling.

Stub Tooth

A gear tooth profile characterized by a shorter addendum than standard gear teeth, providing increased beam strength capable of withstanding heavy shock and vibration loads.

Flank (Gear Tooth)

The working tooth surface area located radially between the pitch circle and the dedendum (root) circle.

Press Working

A cold chipless manufacturing process where thin sheet metal is cut, sheared, bent, or deformed using matched punch and die sets mounted in a mechanical or hydraulic press.

Blanking

A press working shearing operation where a complete closed-contour piece is punched out of sheet stock, in which the sheared piece constitutes the desired finished workpiece.