Vehicle frame for work vehicle and method for manufacturing same

A vehicle frame for work vehicle comprising a cabin frame, the cabin frame including:

• a pair of side frames defining opposing entrances to the work vehicle, wherein each said side frame is formed with a single one-piece pipe material which has an irregular shape defining a pair of recesses formed on opposite sides thereof and extending along an entire length between a first end and a second end of the pipe material, with the first end connected to the second end such that a tangential direction extending along a region of the first end coincides with a tangential direction extending along a region of the second end;
• a plurality of cross members connecting the side frames;
• right and left doors provided in the respective entrances;
• and
• a front panel;
• a roof panel;
• a rear panel;
• wherein one of the recesses is an outside facing recess of each of the side frames and the other of the recesses is an inside facing recess of each of the side frames;
• wherein each of the right and left doors and the front panel and the rear panel are formed with a transparent material having a curved surface;
• and
• wherein each of the side frames is bent three-dimensionally such that each of the right and left doors is received in the outside facing recess to engage an outside inner periphery edge of the associated side frame along the entire periphery thereof, and such that the front panel, the roof panel, and the rear panel are received in the inside facing recess to engage an inner side perimeter edge of each of the side frames, the inner side perimeter edge defining a front receiving surface receiving the front panel, a roof receiving surface receiving the roof panel, and a rear receiving surface receiving the rear panel.