Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1992-04-20
1993-09-21
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
2643281, 425136, 425168, 364476, B29C 4576
Patent
active
052466434
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for automatically properly discriminating maintenance timing for injection molding machines.
2. Description of the Related Art
An injection molding machine includes expendable parts, such as an injection screw, heating cylinder, mold, etc. When the properties of the expendable parts gradually worsen due to wear, corrosion, etc., the mold may be insufficiently loaded with a resin, or the dwell pressure applied to the mold at the time of mold clamping may be lowered, so that normal molding operation is hindered. Conventionally, therefore, the injection molding machine is disassembled, for example, to replace an expendable part or parts whose performance is worsened, in case of defective molding. If maintenance of the various expendable parts is carried out after detecting the defective molding, however, production of a large number of defectives cannot be avoided. Moreover, a considerable number of expendable parts are subject to deterioration in case of defective molding, and besides, the relationships between the type of defective molding and the types of the expendable parts affected by the defective molding are complicated, so that much labor is entailed by, for example, operation for specifying the expendable parts which require a counterplan to be considered.
Generally, in order to avoid such an awkward situation, the injection molding machine is periodically disassembled, and its expendable parts are subjected to maintenance and inspection. Since the degrees of deterioration of the expendable parts vary depending on the molding conditions, however, it is difficult to determine the timing for the maintenance and inspection properly. The disassembling operation may possibly damage the injection molding machine. If the maintenance operation is repeated too often, therefore, the injection molding machine is liable to be damaged, or labor is wasted, so that the operating efficiency of the injection molding machine lowers.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a method in which maintenance timing for injection molding machines can be automatically properly discriminated without disassembling the injection molding machines.
In order to achieve the above object, a discrimination method for maintenance timing for an injection molding machine according to the present invention comprises steps of: (a) storing in a storage unit, on a time-series basis, a plurality of sets of up-to-date monitor data values, associated individually with molding cycles for the injection molding machine, including expendable parts of a plurality of types, each set composed of respective values of monitor data of a plurality of types individually cyclically detected; (b) automatically cyclically discriminating respective transition trends of the monitor data of the individual types by discriminating, based on the plurality of monitor data values for the individual types cyclically read out on a time-series basis from the storage unit; (c) automatically cyclically determining whether or not a predetermined deterioration level is reached by at least one type of associated expendable part, by the discriminating of the transition trends; and (d) issuing a warning when it is concluded that the predetermined deterioration level is reached by the at least one type of associated expendable part.
According to the present invention, as described above, the respective transition trends of the monitor data of the individual types are discriminated on the basis of the plurality of monitor data values for the individual types read out on a time-series basis from the storage unit, which stores a plurality of sets of up-to-date monitor data, associated with the molding cycles and each set composed of the monitor data of the plurality of types. The warning is issued when it is concluded, based on the result of this discrimination, that the predetermined deterioration level is reached by the associated expendable part
REFERENCES:
patent: 3779731 (1973-12-01), Pollock et al.
patent: 4481589 (1984-11-01), McGowan et al.
patent: 4740148 (1988-04-01), Fujita et al.
Inaba Yoshiharu
Kamiguchi Masao
Neko Noriaki
Saito Osamu
Fanuc Ltd
Heitbrink Jill L.
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