Roll forming

Roll forming

Roll forming, also spelled rollforming, is a continuous bending operation in which a long strip of metal (typically coiled steel) is passed through consecutive sets of rolls, or stands, each performing only an incremental part of the bend, until the desired cross-section profile is obtained. Roll forming is ideal for producing parts with long lengths or in large quantities.

Variation

A variety of cross-section profiles can be produced, but each profile requires a carefully crafted set of roll tools. Design of the rolls starts with a flower pattern, which is the sequence of profile cross-sections, one for each stand of rolls. The roll contours are then derived from the profile contours. Because of the high cost of the roll sets, simulation is often used to validate the designed rolls and optimize the forming process to minimize the number of stands and material stresses in the final product.Roll forming machines are now being produced so that for similar products such as stud and track profiles, a new set of profile rolls is not required. This is achieved by the mill being split along its centre line and the web,flange and ear sizes are set using a control panel which moves the mill rafts centrally to increase or decrease the aforementioned features.

Roll forming lines can be set up with multiple configurations to punch and cut off parts in a continuous operation. For cutting a part to length, the lines can be set up to use a pre-cut die where a single blank runs through the roll mill, or a post-cut die where the profile is cutoff after the roll forming process. Features may be added in a hole, notch, embossment, or shear form by punching in a roll forming line. These part features can be done in a pre-punch application (before roll forming starts), in a mid-line punching application (in the middle of a roll forming line/process) or a post punching application (after roll forming is done). Some roll forming lines incorporate only one of the above punch or cutoff applications others incorporate some or all of the applications in one line.

ee also

*Sheet metal

External links

* [http://www.hillengr.com/The%20Fabricator%20Rotary%20Article.pdf Rotary Punching Revisited for Roll Forming and Stand Alone appications]
* [http://www.hillengr.com/modernmetals_article_version%202.pdf High Speed Servo Rotary Punching Applications]
* [http://www.hillengr.com/notching%20and%20piercing%20tube_a%20review%20of%20tooling%20and%20fabrication%20methods.pdf Notching and Piercing Tubes a Review of Tooling and Fabrication methods]
* [http://www.roll-design.com/en/a-crf-predicting.pdf Analysis of roll formed tube] .
* [http://www.ubeco.com/files/QuManRFDes.pdf Quality Management in Rollform Design] .
* [http://www.oehppos.ru/roll_forming_terms_glossary.htm Pictorial roll forming glossary in four languages: English, Russian, French, and German]


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Look at other dictionaries:

  • Roll forming — Roll forming. См. Профилировка металла. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • roll forming — Смотри формообразующая накатка …   Энциклопедический словарь по металлургии

  • roll forming line — Смотри профилегибочный агрегат …   Энциклопедический словарь по металлургии

  • roll-forming line — Смотри профилегибочный стан …   Энциклопедический словарь по металлургии

  • roll-forming machine — ˈ ̷ ̷ˌ ̷ ̷ ̷ ̷ noun : a machine that shapes sheet metal to a desired curve by means of rollers …   Useful english dictionary

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  • roll — rollable, adj. /rohl/, v.i. 1. to move along a surface by revolving or turning over and over, as a ball or a wheel. 2. to move or be moved on wheels, as a vehicle or its occupants. 3. to flow or advance in a stream or with an undulating motion,… …   Universalium

  • roll — /roʊl / (say rohl) verb (i) 1. to move along a surface by turning over and over, as a ball or a wheel. 2. to move or be moved on wheels, as a vehicle or its occupants. 3. to move onwards or advance in a stream or with an undulating motion, as… …  

  • roll — [[t]roʊl[/t]] v. i. 1) to move along a surface by turning over and over 2) to move or be moved on wheels 3) to flow or advance with an undulating motion, as waves 4) to extend in undulations, as land 5) to elapse, as time 6) to move as in a cycle …   From formal English to slang

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