Construction of conformal cooling channels for injection mold designs

Patent metadata

Field	Value
Publication number	US-12109735-B2
Application number	US-202118681341-A
Country	US
Kind code	B2
Filing date	Aug 27, 2021
Priority date	Aug 27, 2021
Publication date	Oct 8, 2024
Grant date	Oct 8, 2024

Abstract

A computing system may include a design access engine configured to access an injection mold design and a channel construction engine configured to construct conformal cooling channels for the injection mold design. The channel construction engine may do so by extracting a cooling surface of the injection mold design, generating a central offset surface with a same shape as the cooling surface, projecting cooling lines on to the central offset surface, detecting sharp portions of the projected cooling lines, smoothing the detected sharp portions of the projected cooling lines, and generating the conformal cooling channels using the smoothed cooling lines along the central offset surface as a center line for the conformal cooling channels.

First claim

The invention claimed is:

1. A method comprising:
by a computing system:
accessing an injection mold design;
constructing conformal cooling channels for the injection mold design, including by:
extracting a cooling surface of the injection mold design, wherein the cooling surface corresponds to specified portions of the injection mold design to be cooled through the conformal cooling channels;
generating a central offset surface positioned at a central offset distance from the cooling surface;
projecting cooling lines on to the central offset surface;
detecting sharp portions of the projected cooling lines based on sharpness criteria;
smoothing the detected sharp portions of the projected cooling lines to form smoothed cooling lines; and
generating the conformal cooling channels using the smoothed cooling lines along the central offset surface as a center line for the conformal cooling channels; and

providing the injection mold design that includes the constructed conformal cooling channels for physical manufacture to physically manufacture the injection mold design through an additive manufacturing process.

2. The method of claim 1 , further comprising determining the central offset distance as a sum of a minimum distance specified between the cooling surface and the conformal cooling channels and a radius value of the conformal cooling channels.

3. The method of claim 1 , further comprising validating the conformal cooling channels constructed for the injection mold design, including by:
generating a validation offset surface positioned at a validation offset distance from the cooling surface; and
determining a design violation for the conformal cooling channels has occurred responsive to a determination that any portion of the conformal cooling channels extends past the validation offset surface towards the cooling surface.

4. The method of claim 3 , wherein the validation offset distance is a minimum distance specified between the cooling surface and the conformal cooling channels.

5. The method of claim 1 , wherein the sharpness criteria comprise a curvature threshold, and
comprising detecting the sharp portions of the projected cooling lines as curve portions of the projected cooling lines with a curvature value that exceeds the curvature threshold.

6. The method of claim 1 , comprising detecting the sharp portions of the projected cooling lines as curve portions of the projected cooling lines with a curvature that is less than a radius value of the conformal cooling channels.

7. The method of claim 1 , comprising smoothing the detected sharp portions of the projected cooling lines through a spline-based smoothing process.

8. A system comprising:
a processor; and
a non-transitory machine-readable medium comprising instructions that, when executed by the processor, cause a computing system to:
construct conformal cooling channels for the injection mold design, including by:
extracting a cooling surface of the injection mold design, wherein the cooling surface corresponds to specified portions of the injection mold design to be cooled through the conformal cooling channels;
generating a central offset surface positioned at a central offset distance from the cooling surface;
projecting cooling lines on to the central offset surface;

detecting sharp portions of the projected cooling lines based on sharpness criteria;
smoothing the detected sharp portions of the projected cooling lines to form smoothed cooling lines; and
generating the conformal cooling channels using the smoothed cooling lines along the central offset surface as a center line for the conformal cooling channels; and

provide the injection mold design that includes the constructed conformal cooling channels for physical manufacture to physically manufacture the injection mold design through an additive manufacturing process.

9. The system of claim 8 , wherein the channel construction engine is further configured to the instructions, when executed, cause the computing system further to determine the central offset distance as a sum of a minimum distance specified between the cooling surface and the conformal cooling channels and a radius value of the conformal cooling channels.

10. The system of claim 8 , wherein the channel construction engine is further configured to the instructions, when executed, cause the computing system further to validate the conformal cooling channels constructed for the injection mold design, including by:
generating a validation offset surface positioned at a validation offset distance from the cooling surface; and
determining a design violation for the conformal cooling channels has occurred responsive to a determination that any portion of the conformal cooling channels extends past the validation offset surface towards the cooling surface.

11. The system of claim 10 , wherein the validation offset distance is a minimum distance specified between the cooling surface and the conformal cooling channels.

12. The system of claim 8 , wherein the sharpness criteria comprise a curvature threshold, and
wherein the channel construction engine is configured to the instructions, when executed, cause the computing system further to detect the sharp portions of the projected cooling lines as curve portions of the projected cooling lines with a curvature value that exceeds the curvature threshold.

13. The system of claim 8 , wherein the channel construction engine is configured to the instructions, when executed, cause the computing system further to detect the sharp portions of the projected cooling lines as curve portions of the projected cooling lines with a curvature that is less than a radius value of the conformal cooling channels.

14. The system of claim 8 , wherein the channel construction engine is configured to the instructions, when executed, cause the computing system further to smooth the detected sharp portions of the projected cooling lines through a spline-based smoothing process.

15. A non-transitory machine-readable medium comprising instructions that, when executed by a processor, cause a computing system to:
access an injection mold design;
construct conformal cooling channels for the injection mold design, including by:
extracting a cooling surface of the injection mold design, wherein the cooling surface corresponds to specified portions of the injection mold design to be cooled through the conformal cooling channels;
generating a central offset surface positioned at a central offset distance from the cooling surface;
projecting cooling lines on to the central offset surface;
detecting sharp portions of the projected cooling lines based on sharpness criteria;
smoothing the detected sharp portions of the projected cooling lines to form smoothed cooling lines; and
generating the conformal cooling channels using the smoothed cooling lines along the central offset surface as a center line for the conformal cooling channels; and

provide the injection mold design that includes the constructed conformal cooling channels for physical manufacture to physically manufacture the injection mold design through an additive manufacturing process.

16. The non-transitory machine-readable medium of claim 15 , wherein the instructions, when executed, cause the computing system to determine the central offset distance as a sum of a minimum distance specified between the cooling surface and the conformal cooling channels- and a radius value of the conformal cooling channels.

17. The non-transitory machine-readable medium of claim 15 , wherein t

Assignees

• Siemens Ind Software Inc

Inventors

• Li Zhi
• Wang Liwen
• Chong Chee-Keong
• Zhou Shunshun

Classifications

• B29C45/7312

  Construction of heating or cooling fluid flow channels · CPC title

• B29C64/386

  Data acquisition or data processing for additive manufacturing · CPC title

• B33Y80/00

  Products made by additive manufacturing · CPC title

• B33Y50/00

  Data acquisition or data processing for additive manufacturing · CPC title

• B29L2031/757

  Moulds, cores, dies · CPC title