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Method and Apparatus for the Control of Injection Molding

Summary

Injection molding relies on the correct identification for the timing of the transfer from injection velocity control to packing pressure control with a production of a quality article. Problems with the criteria used in current procedures include: leakage of melt and variations in melt temperature caused by melt density (for volume-based criteria); increase in tooling costs, introduce undesirable marks on surface of molded parts, and so on (for pressure-based criteria). In both cases, the operator has to be very skilled in interpreting and drawing relationships between injection velocity, melt temperature, materials and mold geometry, in order to understand the molding conditions. Changes in molding conditions require reconsideration of the predetermined threshold, and so involves extensive trial and error process.

The new apparatus and method applies fuzzy inference technique to injection molding, and by means of nozzle pressure or cavity pressure data collected, automatically determine a suitable time for transfer from injection velocity control to packing pressure control. This therefore avoids most of the above-mentioned problems.

Technology Benefits

1. Precise/Accurate
2. Automated
3. Easy to operate
4. Versatile (can perform as a module or in standalone condition)
5. Avoid undesirable marks on the molded parts
6. Cost-effective
7. Time saving

Technology Application

- A module attached to injection molding control systems
- A standalone injection molding control system

Supplementary Information

Patent Number: US6309571B2
Application Number: US199831834A
Inventor: Gao, Furong | Zhao, Chunhua
Priority Date: 27 Feb 1998
Priority Number: US6309571B2
Application Date: 27 Feb 1998
Publication Date: 30 Oct 2001
IPC Current: B29C004546 | B29C004577
US Class: 2640401 | 2640405 | 2643281 | 425145 | 425149 | 700050 | 700203
Assignee Applicant: The Hong Kong University of Science & Technology | Moog Japan Ltd.
Title: Method and apparatus for the control of injection molding
Usefulness: Method and apparatus for the control of injection molding
Summary: In the control of an injection molding system.
Novelty: Control of the time of transfer from injection velocity to packing pressure control in injection molding

Industry

Chemical/Material

Sub Group

Chemical/Material Application

Application Date

27 Feb 1998

Application No.

US 09/031834

Patent Information

US 6309571

ID No.

TTC.PA.058

Country/Region

Hong Kong

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