Numerical-simulation method for rotary metal forming, recording medium and program

A computer-readable recording medium recorded with a computer program for making a computer function as a fixed axis of rotation time conversion section by performing the steps of:

• dividing, into a plurality of finite elements, a predetermined model zone between two imaginary cutting planes intersecting with a circumferential direction in a rotary formed body rotated about an axis of rotation;
• setting velocity boundary conditions of said imaginary cutting planes for said predetermined model zone by a function, wherein an angular velocity for rotation about said axis of rotation of said rotary formed body is variable and the velocity boundary conditions are set so as to model plastic deformation of said rotary formed body in the circumferential direction;
• and
• analyzing, by a finite element method, a forming process that continuously produces plastic deformation by localized contact with said rotary formed body,
• the recording medium further comprising a program for making said computer function as a boundary condition conversion section for, in a case where said axis of rotation is displaced with an addition of an increase in diameter of said rotary formed body in said forming process, setting said velocity boundary conditions equal to a function having three variables, including (1) a rate of increase of the diameter of said rotary formed body, (2) said angular velocity for rotation about said axis of rotation of said rotary formed body, and (3) a correction value for traverse velocity of said axis of rotation.

A system for numerical-simulation of rotary metal forming, comprising:

• a first device configured to divide, into a plurality of finite elements, a predetermined model zone between two imaginary cutting planes intersecting with a circumferential direction in a rotary formed body rotated about an axis of rotation;
• a second device configured to set velocity boundary conditions of said imaginary cutting planes for said predetermined model zone by a function, wherein an angular velocity for rotation about said axis of rotation of said rotary formed body is variable and the velocity boundary conditions are set so as to model plastic deformation of said rotary formed body in the circumferential direction;
• and
• a third device configured to analyze, by a finite element method, a forming process that continuously produces plastic deformation by localized contact with said rotary formed body,
• wherein in a case where said axis of rotation is displaced with an addition of an increase in diameter of said rotary formed body in said forming process, said second device is configured to set said velocity boundary conditions equal to a function having three variables, including (1) a rate of increase of the diameter of said rotary formed body, (2) said angular velocity for rotation about said axis of rotation of said rotary formed body, and (3) a correction value for traverse velocity of said axis of rotation.