Vehicle door frame structure and method of producing vehicle door frame
In a vehicle door frame structure including a sheet-metal member of a vehicle door frame, the sheet-metal member formed by a metal sheet includes a folded edge at an edge of the metal sheet, wherein an end of the folded edge is in noncontact with a remaining part of the metal sheet. The folded edge has an inclined shape which is inclined to increase a distance between the folded edge and the remaining part of the metal sheet in a direction from a bend of the folded edge to a free end of the folded edge.
1. A vehicle door frame structure including a sheet-metal member of a vehicle door frame, said sheet-metal member formed by a metal sheet comprising:
a folded edge at an edge of said metal sheet,
wherein an end of said folded edge is in noncontact with a remaining part of said metal sheet, and
wherein said folded edge has an inclined shape which is inclined to increase a distance between said folded edge and said remaining part of said metal sheet in a direction from a bend of said folded edge to a free end of said folded edge.
2. The vehicle door frame structure according to claim 1 , wherein said sheet-metal member comprises a vertical pillar sash of a door sash of said vehicle door frame, and
wherein said folded edge is formed at a vertical edge of a design portion of said vertical pillar sash on a vehicle exterior side thereof.
3. The vehicle door frame structure according to claim 1 , wherein a waterproof agent is applied between said end of said folded edge and said remaining part of said metal sheet.
4. The vehicle door frame structure according to claim 1 , wherein an opening angle of said folded edge relative to said remaining part of said metal sheet is less than 25 degrees.
5. The vehicle door frame structure according to claim 1 , wherein a width of said metal sheet varies progressively.
6. The vehicle door frame structure according to claim 1 , wherein said metal sheet is press-worked to form said sheet-metal member, together with said folded edge.
7. A method of producing a vehicle door frame including a sheet-metal member, which is formed by a metal sheet in which a folded edge is formed at an edge of said metal sheet, said method comprising:
down-flanging said edge of said metal sheet to form a bent edge, and
partially hemming said bent edge of said metal sheet,
wherein said partially hemming of said bent edge of said metal sheet is performed in a single operation so that said folded edge is angled relative to a remaining part of said metal sheet so that a distance between said folded edge and said remaining part of said metal sheet increases with respect to a direction from a bend of said folded edge to a free end of said folded edge.