Method, device, and program of evaluating peripheral shape of press formed part, and method of manufacturing press formed part

A device for evaluating a peripheral shape of a press formed part by comparing a peripheral shape of an actual press formed part obtained by actually press forming a blank using a tool of press forming with a peripheral shape of a press formed part analysis model obtained by elastoplastic mechanical analysis in a process of press forming the actual press formed part and evaluating each of the peripheral shapes, the device comprising:

• an actual press formed part peripheral shape acquisition unit configured to generate a press formed part workpiece shape model from three-dimensional surface profile measurement data acquired by measuring a surface profile of the actual press formed part after die release of the actual press formed part and springback thereof, to perform mechanical analysis in a process of sandwiching the press formed part workpiece shape model up to a forming bottom dead center by a model of the tool of press forming of the tool of press forming, to acquire a press formed part workpiece bottom dead center shape model at the forming bottom dead center, and to acquire a peripheral shape of the obtained press formed part workpiece bottom dead center shape model as the peripheral shape of the actual press formed part;
• a press formed part analysis model peripheral shape acquisition unit configured to acquire the press formed part analysis model at the forming bottom dead center by performing elastoplastic mechanical analysis in a process of press forming a blank model of the blank using the model of the tool of press forming over a single process or a plurality of processes, and to acquire the peripheral shape of the obtained press formed part analysis model;
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• a peripheral shape comparison/evaluation unit configured to compare the peripheral shape of the actual press formed part acquired by the actual press formed part peripheral shape acquisition unit with the peripheral shape of the press formed part analysis model acquired by the press formed part analysis model peripheral shape acquisition unit and evaluate each of the peripheral shapes.

A non-transitory computer-readable recording medium on which an executable program for evaluating a peripheral shape of a press formed part by comparing a peripheral shape of an actual press formed part obtained by actually press forming a blank using a tool of press forming with a peripheral shape of a press formed part analysis model obtained by elastoplastic mechanical analysis in a process of press forming the actual press formed part and evaluating each of the peripheral shapes, the program causing a processor of a computer to execute:

• an actual press formed part peripheral shape acquisition step of generating a press formed part workpiece shape model from three-dimensional surface profile measurement data acquired by measuring a surface profile of the actual press formed part after die release of the actual press formed part and springback thereof, performing mechanical analysis in a process of sandwiching the press formed part workpiece shape model up to a forming bottom dead center by a model of the tool of press forming of the tool of press forming, acquiring a press formed part workpiece bottom dead center shape model at the forming bottom dead center, and acquiring a peripheral shape of the obtained press formed part workpiece bottom dead center shape model as the peripheral shape of the actual press formed part;
• a press formed part analysis model peripheral shape acquisition step of obtaining the press formed part analysis model at the forming bottom dead center by performing elastoplastic mechanical analysis in a process of press forming a blank model of the blank using the model of the tool of press forming over a single process or a plurality of processes, and acquiring the peripheral shape of the obtained press formed part analysis model;
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• a peripheral shape comparison/evaluation step of comparing the peripheral shape of the actual press formed part acquired in the actual press formed part peripheral shape acquisition step with the peripheral shape of the press formed part analysis model acquired in the press formed part analysis model peripheral shape acquisition step and evaluating each of the peripheral shapes.