Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1992-07-24
1994-01-04
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
2643281, 425135, 425140, 364476, B29C 4576
Patent
active
052757684
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an injection molding condition setting method, more particularly, to a method for setting optimum molding conditions by utilizing an expert system.
BACKGROUND ART
In general, a set of optimum molding conditions for manufacturing conforming articles are set by the method of trial and error before mass-producing molded articles. More specifically, one or more molding conditions are modified depending on the type and degree of a molding defect of the molded articles occurred in a molding cycle tried under provisional molding conditions, and the molding cycle is executed repeatedly until the optimum molding conditions are obtained. However, a number of molding conditions are concerned in the molding cycle which is composed of a series of processes such as injection, dwell, metering, etc. Besides, the molding conditions interact with one another. Thus, setting the optimum molding conditions requires much time and labor, as well as skill.
These problems may be solved by constructing a conventional expert system, such as a troubleshooting system, which is comparable to an expert in problem solving capability. It is difficult, however, to put the expert system to practical use, and correction or modification of the system in practical use is a laborious work. Moreover, in some cases the system requires reconstruction. Having these problems on application, the expert system cannot be easily utilized for injection molding.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a method capable of setting optimum molding conditions quickly and easily by utilizing an expert system, as well as facilitating the use of the expert system.
In order to achieve the above object, an injection molding condition setting method according to the present invention comprises: (a) previously constructing an expert system including a knowledge base set by giving weight to a molding defect countermeasure for each combination of a first parameter group associated with molding cycles and a second parameter group associated with molding defects, (b) automatically detecting the remainder of the first parameter group in a molding cycle while trying the molding cycle under a set of molding conditions corresponding to a part of the first parameter group and set in advance, (c) examining a molded article obtained by the tried molding cycle and manually inputting the second parameter group associated with the molded article, (d) automatically modifying at least one molding condition in accordance with a molding defect countermeasure selected by the expert system on the basis of the first parameter group, of which the part is set in advance and the remainder is automatically detected, and the manually inputted second parameter group, and executing the molding cycle under the set of modified molding conditions, and (e) automatically modifying the weight of the molding defect countermeasure selected in the process (d), in accordance with the first and second parameter groups associated with the molding cycle executed under the unmodified molding conditions and the first and second parameter groups associated with the molding cycle executed under the modified molding conditions.
Preferably, the knowledge base includes a state table, containing a plurality of sets of predetermined combinations of the first and second parameter groups, and a weight table in which the molding defect countermeasure for each combination of the first and second parameter groups is set with a weight. Further, the knowledge base includes a state evaluation reference for specifying one of the plurality of sets of predetermined combinations stored in the state table which is nearest to the combination of the first and second parameter groups associated with the tried molding cycle, a countermeasure decision reference for selecting one of the plurality of molding defect countermeasures stored in the weight table which corresponds to the specified combination, and a weight modification reference fo
Inaba Yoshiharu
Kamiguchi Masao
Taira Takayuki
Watanabe Hiroshi
Fanuc Ltd.
Heitbrink Jill L.
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