STATUS: DRAFT
This standard defines a universal way to describe a shapes.
Inhoud
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".
- 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.
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 |
H |
Solid |
Hollow |
CH, RH |
CH is a pipe. |
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. |
S |
2: Parallel thickness |
Flange is a slope |
IDS, UDS |
Also typical for some warm rolled products. |
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 |
|
R |
Sharp edges |
Round edges |
LR, UR |
Typical products with one or more bending radii. |
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 |
Imperial dimensions in inches |
RHRI, IDI |
If the last character of the shape defining string is I, then the parameter that follow are in inches and or degrees. |
String of geometry defining parameters
The following table shows the implementation of what is above. dimensions_shapes.svg
