Spinning forming method

Abstract

A spinning forming method is a method of forming a formation target region of a plate into a tapered shape by using a processing tool while rotating the plate. The processing tool is moved from an inside edge of the formation target region to an outside edge of the formation target region while being pressed against the plate. The plate is rotated in a state where a position of the processing tool is fixed at the outside edge.

1 . A spinning forming method of forming a formation target region of a plate into a tapered shape by using a processing tool while rotating the plate, the spinning forming method comprising:
 moving the processing tool from an inside edge of the formation target region to an outside edge of the formation target region while pressing the processing tool against the plate; and   rotating the plate in a state where a position of the processing tool is fixed at the outside edge.   
     
     
         2 . The spinning forming method according to  claim 1 , wherein the pressing of the processing tool against the plate is performed while locally heating a portion of the plate, the portion being located on a same circumference as a portion of the plate against which portion the processing tool is pressed. 
     
     
         3 . The spinning forming method according to  claim 1 , wherein:
 the processing tool is a forming roller having a trapezoidal cross section that decreases in diameter in a direction away from a rotation axis of the plate; and   the pressing of the forming roller against the plate is performed in a state where a large-diameter portion of the forming roller is in point contact with the plate, and the forming roller is kept in such a posture that an angle between a side surface of the forming roller and a plane orthogonal to the rotation axis of the plate is not less than 1° and not more than 30°.   
     
     
         4 . The spinning forming method according to  claim 1 , wherein the pressing of the processing tool against the plate is performed in a state where a portion of the plate against which portion the processing tool is pressed is floating. 
     
     
         5 . A spinning forming method of forming a formation target region of a plate into a tapered shape by using a processing tool while rotating the plate, the spinning forming method comprising:
 moving the processing tool from an inside edge of the formation target region to an outside edge of the formation target region while pressing the processing tool against the plate; and   reducing an axial sending speed and radial traveling speed of the processing tool when the processing tool is located in a vicinity of the outside edge.   
     
     
         6 . The spinning forming method according to  claim 5 , wherein the pressing of the processing tool against the plate is performed while locally heating a portion of the plate, the portion being located on a same circumference as a portion of the plate against which portion the processing tool is pressed. 
     
     
         7 . The spinning forming method according to  claim 5 , wherein:
 the processing tool is a forming roller having a trapezoidal cross section that decreases in diameter in a direction away from a rotation axis of the plate; and   the pressing of the forming roller against the plate is performed in a state where a large-diameter portion of the forming roller is in point contact with the plate, and the forming roller is kept in such a posture that an angle between a side surface of the forming roller and a plane orthogonal to the rotation axis of the plate is not less than 1° and not more than 30°.   
     
     
         8 . The spinning forming method according to  claim 5 , wherein the pressing of the processing tool against the plate is performed in a state where a portion of the plate against which portion the processing tool is pressed is floating. 
     
     
         9 . The spinning forming method according to  claim 2 , wherein:
 the processing tool is a forming roller having a trapezoidal cross section that decreases in diameter in a direction away from a rotation axis of the plate; and   the pressing of the forming roller against the plate is performed in a state where a large-diameter portion of the forming roller is in point contact with the plate, and the forming roller is kept in such a posture that an angle between a side surface of the forming roller and a plane orthogonal to the rotation axis of the plate is not less than 1° and not more than 30°.   
     
     
         10 . The spinning forming method according to  claim 2 , wherein the pressing of the processing tool against the plate is performed in a state where a portion of the plate against which portion the processing tool is pressed is floating. 
     
     
         11 . The spinning forming method according to  claim 3 , wherein the pressing of the processing tool against the plate is performed in a state where a portion of the plate against which portion the processing tool is pressed is floating. 
     
     
         12 . The spinning forming method according to  claim 9 , wherein the pressing of the processing tool against the plate is performed in a state where a portion of the plate against which portion the processing tool is pressed is floating. 
     
     
         13 . The spinning forming method according to  claim 6 , wherein:
 the processing tool is a forming roller having a trapezoidal cross section that decreases in diameter in a direction away from a rotation axis of the plate; and   the pressing of the forming roller against the plate is performed in a state where a large-diameter portion of the forming roller is in point contact with the plate, and the forming roller is kept in such a posture that an angle between a side surface of the forming roller and a plane orthogonal to the rotation axis of the plate is not less than 1° and not more than 30°.   
     
     
         14 . The spinning forming method according to  claim 6 , wherein the pressing of the processing tool against the plate is performed in a state where a portion of the plate against which portion the processing tool is pressed is floating. 
     
     
         15 . The spinning forming method according to  claim 7 , wherein the pressing of the processing tool against the plate is performed in a state where a portion of the plate against which portion the processing tool is pressed is floating. 
     
     
         16 . The spinning forming method according to  claim 13 , wherein the pressing of the processing tool against the plate is performed in a state where a portion of the plate against which portion the processing tool is pressed is floating.