Press system and method of controlling the same

A press system comprising:

• a press portion;
• and
• a controller configured to control the press portion,
• the controller including
• a speed pattern generator configured to generate a plurality of speed patterns of a slide of the press portion based on an upper limit of a speed of the press portion, a lower limit of a speed of the press portion, and a number of divisions of a forming stroke and positions of division of the forming stroke,
• an evaluation input unit configured to input evaluation of quality of each of a plurality of formed products formed by the press portion in accordance with the plurality of speed patterns, and
• an optimum speed pattern setting unit configured to set an optimum speed pattern based on a plurality of evaluations of the quality input by the evaluation input unit,
• the optimum speed pattern setting unit including
• a response surface generator configured to create from evaluation value data based on the plurality of speed patterns and the plurality of evaluations of the quality, by using as an objective function, the evaluation value data with the speed pattern being defined as a design variable, a response surface of the objective function, and
• an optimization calculator configured to find an optimum solution of the objective function of the response surface by optimization.

A method of controlling a press apparatus including a press portion, the method comprising:

• generating a plurality of load patterns for a cushion pad based on an upper limit load, a lower limit load, and a plurality of positions of division of a forming stroke, each load pattern corresponding to a die cushion load applied by the press portion;
• inputting evaluation of quality of each of a plurality of formed products formed by the press portion in accordance with a plurality of generated load patterns;
• and
• setting an optimum load pattern based on a plurality of input evaluations of the quality,
• the setting an optimum load pattern including
• creating from evaluation value data based on the plurality of load patterns and the plurality of evaluations of the quality, by using as an objective function, the evaluation value data with the load pattern being defined as a design variable, a response surface of the objective function, and
• performing optimization calculation to find an optimum solution of the objective function of the response surface by optimization.

A method of controlling a press apparatus including a press portion, the method comprising:

• generating a plurality of speed patterns of a slide of the press portion based on an upper limit of a speed of the press portion, a lower limit of a speed of the press portion, and a number of divisions of a forming stroke and positions of division of the forming stroke;
• inputting evaluation of quality of each of a plurality of formed products formed by the press portion in accordance with a plurality of generated speed patterns;
• and
• setting an optimum speed pattern based on a plurality of input evaluations of the quality,
• the setting an optimum speed pattern including
• creating from evaluation value data based on the plurality of speed patterns and the plurality of evaluations of the quality, by using as an objective function, the evaluation value data with the speed pattern being defined as a design variable, a response surface of the objective function, and
• performing optimization calculation to find an optimum solution of the objective function of the response surface by optimization.