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Cards in this deck (46)
- 1do not use a sharp cutting tool in the conventional sense Developed since World War IInon traditional processes
- 2typical form of mechanical action is erosion of work material by a high velocity stream of abrasives or fluidmechanical nontraditional machining
- 3– thermal energy usually applied to small portion of work surface, causing that portion to be fused and/or vaporizedthermal nontraditional machining
- 4chemical etchants selectively remove material from portions of workpart, while other portions are protected by a maskchemical nontraditional machining
- 5Uses high pressure, high velocity stream of water directed at work surface for cuttingwater jet cutting
- 6Used to cut narrow slits in flat stock such as plastic, textiles, composites, floor tile, carpet, leather,cardboard and fish fillets not suitable for brittle materialsWJC applications
- 7advantages of WJC-no crushing/burning work
-minimum material loss
-easy tautomation - 8during wjc, abrasives have to be used. these abrasives are usually___________aluminum oxide, silicone dioxide, and garnet (a silicate material)
- 9High velocity stream of gas containing small abrasive particlesabrasive jet machining (AJM)
- 10AJM Applicationsdeburring, trimming and deflashing, cleaning, and polishing
- 11Material is removed by fusion or vaporization Physical and metallurgical damage to the new work surface In some cases, resulting finish is so poor that subsequent processing is requiredthermal energy processes
- 12EDM-conventional thermal energy process
-electric discharge machining - 13two main EDM Processesram/die sinker
-wire - 14EDM layout
- 15widely used themal process that requires dielectric fluid, which creates a path for each discharge as fluid becomes ionized in the gapEDM operation
- 16what are not factors in EDMHardness and strength
- 17Tooling for many mechanical processes:molds and dies
- 18Special form of EDM uses small diameter wire as electrode to cut a narrow kerf in work
- 19in wire edm, the work is fed _____ past wire along cutting path, like a _________ operation. and _______ is used for motion control.slowly
bandsaw
CNC - 20Definition of kerf and overcut in electric discharge wire cutting photo
- 21a few wire EDM applications arestamping die components
lathe form tools
extrusion dies
flat templates - 22PAC is _____ and it uses _______ at _________ to cut metal by meltingPlasma arc cutting
plasma stream
very high temperatures - 23plasma arc cutting diagram
- 24plasma is ____________. temps for plasma are _______ to _________.a superheated, electrically ionized gas
18000 to 25000 F - 25most applications of PAC involve___________. It can be operated by ______ or _________.cutting of flat metals sheets and plates
hand-held torch or automated by CNC - 26OFC stands for ____________ and is aka ___________. In this process, the torch delivers a mixture of _______ and ______ and directs_____ to cutting region.Oxyfuel Cutting Processes
flame cutting
oxygen and fuel gas
a stream of oxygen - 27in OFC, the primary mechanism of material removal is ______________chemical reaction of oxygen with base metal
OXIDATION - 28OFC Fuels the highest flame temperature would be-acetylene
6300 F
Others: MAPP, Propylene and Propane - 29manual examples of OFC applications include _________. Doing this by machine, the advantages areRepair Work, cutting scrap metal, trimming risers from sand castings
faster speeds and greater accuracies - 30CHM stands for _______ and is material removal through contact with a strong _________chemical etchant
- 31Applications of Chemical milling include _________. this is applicable to ____________ where substantial amounts of metal are ___________. The method used here is known as the ___________.removing metal from aircraft wings for weight reduction
large parts
cut and peel maskant method - 32first step in chemical machining is to _______. Then you ________ which is applied to surfaces not to be _______. step 3 is _______ where the part is immersed into etchant that ____________. Last step is ________ where the masking is _________.clean the part
apply the maskant; etched
Etching; attacks those portions of work not masked
Demasking; removed - 33three methods of masking includecut and peel
photographic resist
screen resist - 34cut and peel method summarizedyou apply the maskant like a paint and to remove it you cut it and peel it off
- 35factors to consider when selecting an etchantwork material, deptch and rate of material removal, and the surface finish requirements
also match the maskant requirements - 36material removal rate in CHM is in ______ and can be between _________ and __________.mm/min or in/min
0008 and 002 in/min - 37etching occurs _______ and _______ under the maskant. -undercut in CHM photodownward and sideways
- 38LAST TWO SLIDES ON NONTRADITIONAL POWERPOINTSJJKS
- 39chemical milling, sequence of processinglast 2 slides of ekmfkeqm
- 40powders are compressed into desired shape to produce green compactpressing
- 41green compacts are heated to bond the particles into a hard, rigid masssintering
- 42PM parts can be mass produced to _________ or __________, eliminating or reducing the need for subsequent machiningnear shape or net shape
- 43this process wastes little materialPM
- 44PM can produce porous metals by choosing the level of ________ for themPorosity
- 45reasons why pm is important-certain alloys cant be produced other ways
good compared to others processes considering dimensional control - 46—
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- Flashcards on Untitled, created by Katarina Kentera on 05/03/2020.
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- Katarina Kentera
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