Abstract: A workpiece quality determination system for determining the quality of a workpiece based on a stripe pattern projected on a surface of the workpiece includes an observation angle setter that sets an observation angle at which the projected stripe pattern on the workpiece is observed, a stripe projection angle setter that sets the stripe projection angle of the projected stripe pattern at the set observation angle, a reference stripe pattern creator that creates a reference stripe pattern from the projected stripe pattern at the set stripe projection angle, and a quality determinator that calculates a difference between the projected stripe pattern and the reference stripe pattern at the stripe projection angle to determine the quality based on the difference.

Abstract: There is provided a die device capable of reliably releasing a workpiece from a die even when the workpiece has an undercut, and conveying the workpiece to a next process. A die device including: a lower die; and a lifter that lifts a pressed workpiece from the lower die, the lower die having an undercut region which is a portion that interferes with the workpiece when the workpiece is moved along a press direction, the lifter including: a vacuum cup that comes into contact with the workpiece; a rod part having a distal end provided with the vacuum cup; and a linear drive servomotor for causing the rod part to advance/retreat in an axial direction, and further including a rotary drive servomotor that turns the lifter in a direction orthogonal to the axial direction, wherein the lifter moves the workpiece by combining both movement along the press direction and movement in a direction inclined to the press direction.

Abstract: A die is produced based on die model data. The produced die is corrected. The corrected die is three-dimensionally measured by a measuring tool to produce measured three-dimensional die data. A polygonal surface represented by the measured three-dimensional die data and a model surface represented by the die model data are compared with each other. The polygonal surface is brought into proximity to the model surface, and the absolute values of the distances between a plurality of pairs of measuring points on the polygonal surface and corresponding points on the model surface are calculated. The die model data are corrected based on the absolute values of the distances.

Abstract: A die fabricated based on reference model data is corrected, and the corrected die is measured with a measuring instrument to provide three-dimensional measured die data. Noise areas in the three-dimensional measured die data are identified and removed using a computer. The three-dimensional measured die data and the model data are placed in proximity to each other, and a stacking and deforming process is performed in order to project a model surface represented by the model data onto a measured data surface represented by the three-dimensional measured die data. The stacking and deforming process is performed only within a range of the model surface that corresponds to an area in which the die is corrected. Portions of the three-dimensional measured die data from which noise areas have been removed are complemented by the model data.

Abstract: A die is produced based on die model data. The produced die is corrected. The corrected die is three-dimensionally measured by a measuring tool to produce measured three-dimensional die data. A polygonal surface represented by the measured three-dimensional die data and a model surface represented by the die model data are compared with each other. The polygonal surface is brought into proximity to the model surface, and the absolute values of the distances between a plurality of pairs of measuring points on the polygonal surface and corresponding points on the model surface are calculated. The die model data are corrected based on the absolute values of the distances.