JP2007118087A5 - - Google Patents

Claims (20)

In the manufacturing method of a finished product structure that has a side surface portion and a bottom surface portion, and is manufactured based on an intermediate molded product that includes a curved surface portion at the end of the bottom surface portion,
  Completing to manufacture the structure by applying an external force in a direction in which the curvature of the curved surface portion is reduced with respect to the curved surface portion while restricting the side surface portion of the intermediate molded product from opening outward. Manufacturing method of product structure. The method for manufacturing a finished product structure according to claim 1, wherein the intermediate molded product has a joint, and the joint is brought into close contact by a springback force. The finished product structure according to claim 2, wherein an angle formed between the side surface portion and the bottom surface portion of the intermediate molded product is larger than an angle formed between the side surface portion and the bottom surface portion of the finished product structure. Manufacturing method. The method for manufacturing a finished product structure according to any one of claims 1 to 3, wherein the intermediate molded product is formed with an engaging projection at a portion having the joint. 2. The method for manufacturing a finished product structure according to claim 1, wherein a pipe body is manufactured as the finished product structure. The method of manufacturing a finished product structure according to claim 5, wherein the curved surface portion has a protruding shape. A method for manufacturing a structure having a joint, wherein the joint is brought into close contact by a springback force. In a finished product structure having a side surface portion and a bottom surface portion and manufactured based on an intermediate molded product having a curved surface portion at the end of the bottom surface portion,
  A finished product structure manufactured by applying an external force to the curved surface portion in a direction in which the curvature is reduced while restricting the side surface portion of the (intermediate) molded product from opening outward. The finished product structure according to claim 8, wherein the intermediate molded product has a joint, and the joint is in close contact by a springback force. 10. The finished product structure according to claim 9, wherein an angle formed between the side surface portion and the bottom surface portion of the intermediate molded product is larger than an angle formed between the side surface portion and the bottom surface portion of the finished product structure. . The finished product structure according to any one of claims 8 to 10, wherein the intermediate molded product has an engaging projection formed in a portion having the joint. 9. The finished product structure according to claim 8, wherein the finished product structure is a pipe body. The finished product structure according to claim 8, wherein the curved surface portion has a protruding shape. The finished product structure according to claim 9, wherein the seam is in close contact by a springback force. The support member which has a structure of any one of Claims 8 thru | or 14. A frame structure having the support member according to claim 15. An image forming apparatus having the frame structure according to claim 16. In order to form a pipe body having a seam made of a rectangular metal plate and having a circular closed cross section, the metal plate is curved so that the seam of the metal plate is in a non-contact state and the pair thereof. A direction in which the curvature of the convex curved surface portion is reduced while forming a curved intermediate molded product that extends long in the direction in which the sides extend and has a convex curved surface portion outward, and then maintains a lateral force. By deforming the curved intermediate molded product by applying an external force to the pipe, a pipe body in which the seam is in close contact is formed on the basis of a springback force that causes the convex curved surface portion to return to its original shape. Body manufacturing method. A manufacturing method for manufacturing a pipe body having a rectangular metal plate as a raw material and having a plurality of constituent wall portions and a seam and having a closed cross section having a square shape,
  A first processing step of forming a seam constituting wall part to which the seam belongs by raising at least one of the pair of side parts of the metal plate along a direction in which the side extends;
  The remaining configuration wall portion other than the seam configuration wall portion is formed, and the seam is in a non-contact state, and one configuration wall portion of the remaining configuration wall portions and an adjacent surface configuration adjacent to the one configuration wall portion A second processing step for forming an intermediate molded product having an angle formed with a wall portion larger than an angle when the pipe body is completed;
  A third processing step of applying an external force to the adjacent surface constituting wall portion to form a convex curved surface portion bulging outwardly in the one constituting wall portion and closely contacting a seam of the seam constituting wall portion;
  In a state where the pressure applied to the side surface configuration wall portion is maintained, an external force is applied to the one configuration wall portion to deform the convex curved surface portion into a flat shape so that the one configuration wall portion returns to the original convex curved surface shape. A fourth processing step of forming a pipe body in which the pair of sides are in close contact with each other based on a springback force to be applied;
The manufacturing method of the pipe body characterized by including. A bottom-surface-constituting wall portion, a pair of side-surface-constituting wall portions adjacent to the bottom-surface-constituting wall portion, and a top-surface-constituting wall portion to which a seam belongs opposite to the bottom-surface-constituting wall portion, A pipe body which is formed as a raw material, the seam is brought into close contact based on a springback force, and each of the constituent wall portions extends in the longitudinal direction.