US 6,618,643 B2 · Injection mold design system and injection mold design method

Abstract

An injection mold design method for correcting a profile of a product to be fabricated into a releasable profile from a mold to design an injection mold based on a corrected product shape, utilizing a storage device for storing information of the product shape and mold profile, a display device for displaying the product shape or the mold profile on a screen based on the information read from the storage device, an input device for inputting designation information necessary for correction of the product shape or the mold profile, and a controlling device for unloading information of lines or planes being obstructive to correction of the product shape and the mold profile in the storage device in response to the designation information input by the input device. The method comprises removing lines or planes from the screen, and replotting the lines or the planes on the screen in terms of the information of lines or planes unloaded into the storage device after the correction operation of the product shape of the mold profile is completed.

Claims20

Dependent claims

An injection mold design method for correcting a profile of a product to be fabricated into a releasable profile from a mold comprising:

(a) calculating a normal vector on a plane of a product shape and a reference vector in a mold opening direction;
(b) detecting a normal vector having the opposite direction to that of the reference vector so as to detect undercut portion;
and
(c) after the step (b), forming a split borderline for a slide structure of the mold.

1 more element

An injection mold design method for correcting a profile of a product to be fabricated into a releasable profile from a mold comprising:

(a) designating a plane element of the product;
(b) calculating a shrinkage vector of a resin whose surface defines the plane element where the vector is defined when the resin shrinks;
(c) multiplying a norm of the shrinkage vector and an area of the plane element together to obtain a shrinkage force;
(d) calculating a sticking strength of the product to the mold by multiplying the shrinkage force and a certain coefficient;
and
(e) judging whether an ejector force of an ejector pin is greater than the sticking strength of the product.

3 more elements

Dependencies are inferred from the claim text.

Injection mold design system and injection mold design method

Life of this patent

Injection mold design system and injection mold design method

Life of this patent

Abstract

Claims20