| 摘要 |
A unitary frame structure is disclosed as well as a method of manufacturing the same. The unitary frame structure typically includes a first beam, a second beam adjoining the first rib, and a cross member adjoining the first rib and the second beam. Significantly, each of the first beam, second beam, and cross beams have a Z shaped cross-sectional structure formed by a first flange that is adjacent a substantially vertical portion further shaped with a second flange adjacent an opposite end of the first flange. This Z cross section is formed by machining a unitary pallet in a first vertical direction to form the first lip, flipping the pallet and then machining in a substantially vertical portion in the opposite second vertical direction to form the second flange on an opposite side of the substantially vertical web section only. Placed periodically along the rib sections are stiffening elements formed during the machining operation. The stiffening elements are formed to resist bending in a principle bending direction along the Z section. The stiffening element typically has a substantially flat plane that is skewed to the vertical portions thereby connecting one of the lips to the adjacent vertical portion. These stiffening elements are typically placed back-to-back on adjacent sides on the same area.
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