FROM COMPOSITION AND MATERIALS, LIMITATIONS, SIZES AND STANDARD APPLICATION ... AND MORE.
COMPOSITION MATERIALS. Most architectural metals can be stretchformed, including aluminum alloys, steel, copper, stainless steel, galvanized and certain brasses and bronzes. Aluminum extrusions are the most commonly stretchformed materials. Extruded cross sections include tubes, open back glazing sections, brake shapes, angles and channels. Also shapes with legs in, out, up or down are formable with few exceptions. Shapes may be stretchformed the easy way or the hard way.
COMMERCIAL LIMITATIONS. Materials to be stretchformed should not be notched or drilled prior to forming. Some poured-in-place thermal barriers are not suitable for stretchforming due to brittleness. Use only ductile composition type materials. Paint materials should be of a flexible composition type materials. Paint materials should be of a flexible composition similar to a flouropolymer coating (polyvinylidine PVF2), such as Kynar 500 or silicone polyester (50% silicone). The suitability of anodized materials for stretchforming depends on coating quality and severity of radius. Some discoloration may be apparent in tight radius forms.
Aluminum extrusions, should be available in mill finish if possible, and tempered to a T-1 through T-4 softness. After curving of metal, Techniform can increase temper to a structural hardness of T-5 or T-6 as required.
SIZES. Techniform, is capable of forming any length up to a maximum of 45 feet. Up to 12 inches of extra material length will be required at each end for grip.
APPLICATION STANDARDS. Contact Techniform for standards which may apply. due to the precise and consistent nature of stretchforming, normal architectural fabrication standards and tolerances are maintained or exceeded.
TECHNICAL DATA. This method of forming utilizes stretch presses which can form many sections not possible on conventional roll formers. A common 1-3/4" x 4-1/2" open back channel can be curved the hard way or the easy way. Removal of return flanges and similar modifications are not required by stretchforming. For example, severity of bend radius is a limitation; a 1-3/4" x 4-1/2" open back channel can be formed the easy way to a radius of 6 inches, whereas the hard way is limited to a 9 inch side radius as the tightest and smallest radius. These examples are at the limits of forming capabilities and would likely require finishing after forming, if a finish is specified.
INSTALLATION. Techniform furnishes fabrication services, but does not install the finished product.
AVAILABILITY. Typical material forming turn around time is two weeks or less from receipt of client's materials, purchase order and forming instructions. At our process facility, production times can be confirmed at time of price quotation.
COST. Due to the nature of stretchforming, each project is quoted individually. Order and pricing information is available from Techniform by telephone, usually on the same day.
INSPECTION.
- Approval to MIL-45208
- Complete inspection department per aerospace requirements (including Surface Plates, Gages, Blocks, etc.)
- Numerous prime aircrafters' approvals - both facilities
FACILITY.
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