Patent ID: 6917905

Claim:
A mold design system for designing a mold for use in molding a product, comprising: two-dimensional projection means for producing two-dimensional projection data by projecting edges of a product shape represented by three-dimensional graphic data onto a plane perpendicular to a mold opening direction; and parting line determination means for sequentially determining, out of candidate edges contiguous to a determined parting line, a candidate edge forming a largest interior angle with said determined parting line at a contact point therewith on said two-dimensional projection data, as a parting line of said mold for molding said product shape, wherein when said candidate edge forming said largest interior angle intersects with another candidate edge an even number of times, said candidate edge is set as said parting line, and when said candidate edge forming said largest interior angle intersects with said other candidate edge an odd number of times, said other candidate edge is set as said parting line.