Anti-warping design method for resin molded article, recording medium, and anti-warping design device for resin molded article

Patent metadata

Field	Value
Publication number	US-11651124-B2
Application number	US-201916292828-A
Country	US
Kind code	B2
Filing date	Mar 5, 2019
Priority date	Sep 6, 2016
Publication date	May 16, 2023
Grant date	May 16, 2023

Abstract

An anti-warping design method for designing a resin molded article on a programmed computer includes dividing the molded article into a plurality of small elements, calculating sensitivity values for at least part of the elements with respect to warpage of the molded article, and displaying a distribution of the sensitivity values.

First claim

What is claimed is:

1. An anti-warping design method for designing a resin molded article on a programmed computer, the method comprising:
dividing a model of the molded article into a plurality of small elements each having nodes which are vertexes thereof;
calculating sensitivity values for at least part of the elements with respect to warpage of the molded article; and
displaying a distribution of the sensitivity values,
the calculating of the sensitivity values including calculating, for each of the at least part of the elements, sensitivity of influence exerted on warpage at an evaluated position of the modeled article by shrinkage of the element, as the sensitivity value of the element, the sensitivity of influence being warpage amount of a predetermined node of a predetermined element at the evaluated position in a predetermined direction.

2. The anti-warping design method according to claim 1 , further comprising
inputting the evaluated position and the predetermined direction for evaluating the warpage of the molded article.

3. The anti-warping design method according to claim 2 , wherein
the calculating of the sensitivity values is performed using an adjoint variable method.

4. A non-transitory computer-readable recording medium storing a program causing a computer to execute the anti-warping design method according to claim 3 .

5. An anti-warping design device for a resin molded article, the anti-warping design device comprising:
a processor configured to execute the anti-warping design method according to claim 3 .

6. A non-transitory computer-readable recording medium storing a program causing a computer to execute the anti-warping design method according to claim 2 .

7. An anti-warping design device for a resin molded article, the anti-warping design device comprising:
a processor configured to execute the anti-warping design method according to claim 2 .

8. The anti-warping design method according to claim 1 , further comprising
analyzing the warpage of the molded article by resin molding CAE (Computer-Aided Engineering).

9. The anti-warping design method according to claim 8 , wherein
the calculating of the sensitivity values is performed using an adjoint variable method.

10. A non-transitory computer-readable recording medium storing a program causing a computer to execute the anti-warping design method according to claim 9 .

11. An anti-warping design device for a resin molded article, the anti-warping design device comprising:
a processor configured to execute the anti-warping design method according to claim 9 .

12. A non-transitory computer-readable recording medium storing a program causing a computer to execute the anti-warping design method according to claim 8 .

13. An anti-warping design device for a resin molded article, the anti-warping design device comprising:
a processor configured to execute the anti-warping design method according to claim 8 .

14. The anti-warping design method according to claim 1 , wherein
the calculating of the sensitivity values is performed using an adjoint variable method.

15. A non-transitory computer-readable recording medium storing a program causing a computer to execute the anti-warping design method according to claim 14 .

16. An anti-warping design device for a resin molded article, the anti-warping design device comprising:
a processor configured to execute the anti-warping design method according to claim 14 .

17. A non-transitory computer-readable recording medium storing a program causing a computer to execute the anti-warping design method according to claim 1 .

18. An anti-warping design device for a resin molded article, the anti-warping design device comprising:
a processor configured to execute the anti-warping design method according to claim 1 .

19. The anti-warping design method according to claim 1 , wherein
the calculating of the sensitivity values includes performing, for each of the at least part of the elements, thermal shrinkage analysis considering only the shrinkage of the element with the shrinkage of other elements at zero.

20. The anti-warping design method according to claim 1 , wherein
the calculating of the sensitivity values includes calculating, for each of the at least part of the elements, inner product of a first vector and a second vector,
the first vector being obtained by arranging first displacement amount data in X, Y, and Z directions of each node of the predetermined element at the evaluated position, the first displacement amount data being obtained by performing thermal shrinkage analysis considering all the elements,
the second vector being obtained by arranging second displacement amount data in X, Y, and Z directions of each node of the predetermined element at the evaluated position, the second displacement amount data being obtained by performing the thermal shrinkage analysis considering only the shrinkage of the element with the shrinkage of other elements at zero.

Assignees

• Toray Eng Co Ltd

Inventors

• Nakano Ryo
• Yamakawa Koshiro
• Hyakusai Akira
• Igarashi Shun

Classifications

• G06F30/00

  Computer-aided design [CAD] · CPC title

• B29C45/768

  Detecting defective moulding conditions (B29C45/84 takes precedence) · CPC title

• B29C45/76

  Measuring, controlling or regulating {(measuring in general G01; controlling or regulating in general G05)} · CPC title

• B29C45/7693

  using rheological models of the material in the mould, e.g. finite elements method · CPC title

• G06F30/20

  Design optimisation, verification or simulation (optimisation, verification or simulation of circuit designs G06F30/30) · CPC title