초록 ▼

A mold component for forming a member consisting of a nondevelopable surface, such a member being an airfoil such as a wing or the like, is provided with an interior cavity in the shape of a developable surface which approximates the nondevelopable surface. In forming the mold cavity, points of equa

A mold component for forming a member consisting of a nondevelopable surface, such a member being an airfoil such as a wing or the like, is provided with an interior cavity in the shape of a developable surface which approximates the nondevelopable surface. In forming the mold cavity, points of equal tangential inclination on the non-developable surface are joined by straight lines and then the areas between the straight lines are formed as flat planar surfaces, thereby to form a developable surface which is an approximation of the nondevelopable surface. A flat planar development is then formed from this developable surface and bends are made therein at the straight lines in order to form thereby the mold cavity. A substantial number of said bends extend non-parallel to each other and none of the bends intersect.

대표청구항 ▼

A method for forming a molded component consisting of a developable surface which approximates a nondevelopable surface comprising the steps of: determining a nondevelopable surface to be approximated by a mold component and forming on an identical nondevelopable surface points having equal tangenti

A method for forming a molded component consisting of a developable surface which approximates a nondevelopable surface comprising the steps of: determining a nondevelopable surface to be approximated by a mold component and forming on an identical nondevelopable surface points having equal tangential slopes at profile lines remote from each other; connecting said profile points of equal tangential slopes on said nondevelopable surface with nonintersecting straight lines; forming planar surface areas successively between each of said straight lines thereby to convert said nondevelopable surface into a developable surface; forming from said developable surface thus formed a flat development having said straight lines thereon; bending said flat development along each of said straight lines with a bending angle defined by the corresponding intersecting angle of said planar surface areas existing prior to formation of said flat development in order thereby to form a mold member defining a mold cavity having an inner surface identical with said developable surface; and utilizing said mold member to form a molded component.