- Fine blanking
Fine blanking is a fully automated precision
metalworkingprocess. It is a form of precision metal stamping in which extremely tight tolerances can be held, and usually additional machining steps can be avoided post-production. Materials that can be fine blanked include carbon steels, alloy and stainless steels, as well as soft non ferrousalloys like aluminum, brassor copper.
Fine blanking presses are similar to other metal stamping presses, but they have a few critical additional parts. A typical compound fine blanking press includes a hardened die punch (male), the hardened blanking die (female), and a guide plate of similar shape/size to the blanking die. The guide plate is the first applied to the material, impinging the material with a sharp protrusion or "stinger" around the perimeter of the die opening. Next a counter pressure is applied opposite the punch, and finally the die punch forces the material through the die opening. Since the guide plate holds the material so tightly, and since the counter pressure is applied, the material is cut in a manner more like
extrusionthan typical punching. Mechanical properties of the cut benefit similarly with a hardened layer at the cut edge from the cold workingof the part [cite news | first= | last= | coauthors= | title=Fineblanking 101, Partech | date= 2004-09-20| publisher= | url =http://www.partechfineblanking.com/fineblanking101.htm | work = | pages = | accessdate = 2008-04-18 | language = ] . Because the material is so tightly held and controlled in this setup, part flatness remains very true, distortion is nearly eliminated, and edge burr is minimal. Clearances between the die and punch are generally around 1% of the cut material thickness, which typically varies between .5-13mm [cite book | last = Kalpakjian | first = Serope | authorlink = | coauthors = Schmid, Steven R. | title = Manufacturing Engineering and Technology | publisher = Pearson Prentice Hall | date = 2006 | location = Upper Saddle River, NJ | pages = 429 | url = | doi = | id = | isbn = 0-13-148965-8 ] . Currently parts as thick as 19mm can be cut using fine blanking [ cite web|url=http://www.fineblanking.org/overview/history.html |title=Fineblanking |accessdate=2008-04-18 |last=Precision Resource ] . Tolerances between ±.0003"-.002" are possible based on material thickness & tensile strength, and part layout [ cite web|url=http://www.mpi-int.com/guidelines.pdf |title=guidelines |accessdate=2008-04-18 |last=MPI International, Inc. |format=PDF ] .
With standard compound fine blanking processes, multiple parts can often be completed in a single operation. Parts can be pierced, partially pierced, offset (up to 75•),
embossed, or coined, often in a single operation [cite book | last = Bralla | first = James G. | authorlink = | coauthors = | title = Design for Manufacturability Handbook | publisher = McGraw-Hill | date = 1999 | location = New York, New York | pages =3.47-3.48 | url = | doi = | id = | isbn = 0-07-007139-X ] . Some combinations may require progressive fine blanking operations, in which multiple operations are performed at the same pressing station however.
*excellent dimensional control, accuracy, and repeatability through a production run.
*excellent part flatness is retained.
*straight, superior finished edges to other metal stamping processes.
*smaller holes possible relative to thickness of material [ cite web|url=http://www.fineblanking.org/overview/benefits.html |title=Fineblanking |accessdate=2008-04-18 |last=Precision Resource ] .
*little need to machine details.
*multiple features can be added simultaneously in 1 operation [ cite web|url=http://www.fineblanking.org/overview/benefits.html |title=Fineblanking |accessdate=2008-04-18 |last=Precision Resource ] .
*more economical for large production runs than traditional operations when additional machining cost and time are factored in (between 1000-20000 parts minimum, depending on secondary machining operations [cite book | last = Bralla | first = James G. | authorlink = | coauthors = | title = Design for Manufacturability Handbook | publisher = McGraw-Hill | date = 1999 | location = New York, New York | pages = 3.49-3.50 | url = | doi = | id = | isbn = 0-07-007139-X ] ).
Wikimedia Foundation. 2010.
Look at other dictionaries:
Blanking and piercing — Blanking versus piercing Blanking and piercing are shearing processes in which a punch and die are used to modify webs. The tooling and processes are the same between the two, only the terminology is different: in blanking the punched out piece… … Wikipedia
Blanking (metalworking) — Blanking is a shearing process where a punch and die are used to create a blank from sheet metal or a plate. The process and machinery are usually the same as that used in piercing, except that the piece being punched out in the piercing process… … Wikipedia
Photo chemical machining — Photochemical machining (PCM) is a method of fabricating metal components using reactive etchants to corrosively oxidize selected areas of metal. Also known as photo etching or chemical etching, this process emerged in the 1960s as an offshoot of … Wikipedia
Die (manufacturing) — For the thread cutting tool, see Tap and die. A die is a specialized tool used in manufacturing industries to cut or shape material using a press. Like molds, dies are generally customized to the item they are used to create. Products made with… … Wikipedia
Overscan — is extra image area around the four edges of a video image that may not be seen reliably by the viewer. It exists because television sets in the 1930s through 1970s were highly variable in how the video image was framed within the cathode ray… … Wikipedia
machine tool — machine tooled, adj. a power operated machine, as a lathe, used for general cutting and shaping of metal and other substances. [1860 65] * * * Stationary, power driven machine used to cut, shape, or form materials such as metal and wood. Machine… … Universalium
ANTIC — This article refers to the display chip. For the football manager, see Radomir Antić. For the magazine, see Antic (magazine). ANTIC ( Alpha Numeric Television Interface Circuit or Alpha Numeric Television Interface Controller ) is an early video… … Wikipedia
Tool steel — Iron alloy phases Ferrite (α iron, δ iron) Austenite (γ iron) Pearlite (88% ferrite, 12% cementite) … Wikipedia
Station identification — (sometimes called a sounder or stinger ) is the practice of any type of radio or television station or network identifying itself, typically with a call sign or brand name. Over the air transmitters may be required to identify themselves… … Wikipedia
Italian Wikipedia — Screenshot … Wikipedia