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← Versie 16 sinds 2017-03-10 14:54:53 ⇥
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| Verwijderingen worden op deze manier gemarkeerd. | Toevoegingen worden op deze manier gemarkeerd. |
| Regel 1: | Regel 1: |
| STATUS: DRAFT This standard defines a universal way to describe a shapes. <<TableOfContents()>> = Summary = This standard describes a way to specify basic shapes of sections, together with their dimensions. A code is build with blocks. {{{ [Shape block][Details block][Units block][Geometry block]}}} * Shape block: This is one charater for the main shape * Abbreviations: H Hexagonal, C Circular, S Square, R Rectangular or... * Letters of letter shapes sections: I, U, L, T, O, Z (O is omega shape). * Details block: Zero or more characters constraining the shape. They are only added if required. Order is alphanumerical. * D Diverging thickness, width of one or more wall endings diverge (i.e. are not parallel, ending in radius), typical for warm rolled products. * E Equal width and height and or equal legs * H Hollow sections * F Flanges extra * R Round edges * S Flange has a slope * X or Y Section is cut over x- or y-axis * Units block: Zero or one character, zero for metric in mm and "I" for imperial in inches. * Geometry block: All dimensions needed to constrain a section * The logical order is: First Width and height, then thickness in same order, radii and angles. * Angles can be degrees or ratios like "7/50". * Dimensions are nominal. * See the table with drawings, where dimensions have an order number. * The list separator is an asterisks "*" = Intend = The intend is to offer a way to classify industry standard profiles, not limited to steel, based on shape only. The reasons for using this standard can be: * Shapes are described not depending on manufacturing characteristics such as "warm rolling". * Shapes are described not depending on function characteristics such as "beam". * Shapes are described not depending on material characteristics such as "steel". * The names are better suited for use in automation applications. * Naming is based on visible appearance like "Square" and "Rounded", seeking a compromise between habitual naming, being practical and being complete enough to achieve global coverage. * By defining a shape, followed by parameters for geometry, a global unique designation is created. = Naming = A shape is defined by a concatenated string, consisting of two parts: * Shape defining parameters like R for Rectangular bar. * Geometry defining parameters 30*5 for width and height in mm. Following this example, the designation is: {{{ R30*5}}} == String of shape defining parameters == The name is one or a combination of characters. * The first character is the main shape. Examples: "T-profile" and "Rectangular" * Subsequent characters are only designated if not corresponding to the expected default shape and or add extra shape complexity. This works like a sieve. The longer the code, the more complexity. === First character, main shape === The first character determines the basic shape. {{attachment:basic_profiles.svg|basic_profiles.svg|title=""}} The first row contains abbreviations: ||'''H''' ||Hexagonal || ||'''C''' ||Circular || ||'''S''' ||Square || ||'''R''' ||Rectangular || The second row is more obvious, the letter represents the shape. O stands for omega. === Following characters, additional shape characteristics === The sieve consist of characteristics that are additional to the main shape. So what is standard, what is expected is not specified. Deviations are marked with a character. From top to bottom: ||'''Char.''' ||'''Standard, to be expected''' ||'''Deviation''' ||'''Examples''' ||'''Remarks''' || ||'''D''' ||1: Parallel thickness ||Diverging thickness ||ID, TD ||This is typical for warm rolled and extruded products where internal radii change the thickness or when flanges end in a radius instead of ending straight. || ||'''E''' ||Width does not equal height and or not equal legs ||Equal width and height and or equal legs ||LE, TE, ZE ||For Squares and Rectangles an E is not applicable. For Z-profiles only equality of legs is meant. || ||'''F''' ||No extra flanges ||Extra flanges ||UF || || ||'''H''' ||Solid ||Hollow ||CH, RH ||CH is a pipe. || ||'''R''' ||Sharp edges ||Round edges ||LR, UR ||Typical products with one or more bending radii. || ||'''S''' ||2: Parallel thickness ||Flange is a slope ||IDS, UDS ||Also typical for some warm rolled products. || ||'''X''' or '''Y''' ||Whole shape ||Shape is cut over length ||IDSX, UDY ||X is horizontal cutting, Y is vertical, based on orientation in the table with examples and dimensions and as discussed under "orientation".|| ||'''I''' ||Metric dimensions in millimetres and angles in degrees ||Imperial dimensions in inches ||RHRI, IDI ||If the last character of the shape defining string is I, then the parameters that follow are in inches. || == String of geometry defining parameters == The following table shows the implementation of what is above. {{attachment:dimensions_shapes.svg}} === Orientation === Shapes are positioned as illustrated. The series H, C, S and R as drawn. The letter series as written. So a H-beam (like HEB) is a variant of the family of I-shapes and is drawn as an I. ||'''Abr.'''||'''Meaning'''|| ||'''IP'''||Insertion Point (most logical snap point for CAD)|| ||'''W'''||Width, a horizontal dimension.|| ||'''H'''||Height, a vertical dimension.|| ||'''T'''||Thickness of material.|| ||'''R'''||Radius.|| ||'''A'''||Angle in degrees|| |
