Plastic article or earthenware shaping or treating: apparatus – Female mold and means to shape parison directly by internal... – With means to sever product
Patent
1995-01-27
1996-09-03
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Female mold and means to shape parison directly by internal...
With means to sever product
425531, 425534, 425535, 425806, B29C 4950
Patent
active
055518613
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a quick change mold tooling arrangement for blow molding apparatus used for producing hollow plastic articles.
BACKGROUND ART
It is known that in any industrial sector there is the need for production lines which are characterized by a high degree of flexibility so that they can be retooled rapidly in order to adjust production runs to the variable demands and conditions of the market, both as to the quantity and the type of the items being produced.
Such a need is deeply felt in the art of machines for producing hollow plastic items that contemplate the replacement of molds, where molding particularly blow molding, takes place, so as to allow the changing of shape and/or structure of the produced items using only one blow molding machine.
Known blow molding machines for producing hollow plastic articles include at least one mold having a mold cavity with the shape of the article to be produced, the mold being adapted to be opened and closed. The mold is opened to receive a preform or parison and then closed. After the mold has been closed, compressed air is introduced into the parison contained within the mold through a compressed air feed inlet and a corresponding feed nozzle to carry out the blowing of the parison which is expanded and conformed to the inner wall of the mold cavity to acquire the desired shape. The blow molding machine includes at least one nest or dolly, divided in two sections, that holds the article after being blown and when it has been released by the mold. The machine further includes trim tooling for removing the flash from the article. Also, the machine includes several feed lines for supplying cooling water to the mold and lines for supplying compressed air to the nozzles.
The following operations are required to change the mold and associated accessories: disassemble the group of dollies; disassemble the trim tooling; disconnect the cooling lines of the water cooling system for the molds; disassemble the molds; disconnect the compressed air lines; disassemble the air feed nozzles; reassemble the new tooling; adjust the center distance between the mold and the nest or dolly in the new tooling; adjust the position of the trim tooling in the new tooling; and align the axis of the air feed nozzles with that of the compressed air inlets in the new mold.
It is evident that such a large number of operations requires time and numerous different tools, that is in contrast with the necessity of a rather flexible machine.
Moreover, because it is also necessary to employ specially trained personnel, particularly as far as making adjustments is concerned, the operative costs of such a working station are very high, especially when compared with the relatively low price of the finished item.
DISCLOSURE OF THE INVENTION
The object of the invention is to eliminate the above-mentioned inconveniences and to simplify the assembly and the disassembly associated with the replacement of the molds and associated tooling in a blow molding machine for producing hollow plastic articles.
This result is achieved by the invention, by providing a modular tooling assembly which includes a mold, a nest or dolly, and trim tooling for the removal of the flash, wherein the mold, the nest and the trim tooling are assembled to two parallel opposing plates, which are adapted to be moved apart, which make up the modular assembly that facilitates mold replacement, and wherein the blowing nozzles are mounted on a removable self-bearing support.
Essentially, the advantages are represented by the very easy and fast replacement of molds and associated tooling due to the fact that the number of operations and adjustment to be carried out is drastically reduced; to the fact that such a replacement can be also performed by nonspecialized personnel, resulting in significant reduction in the operative costs of the working station; and by the fact that automation of the mold replacement is possible especially in the case of machine for high capacity production.
These and other
REFERENCES:
patent: 3583031 (1971-06-01), Kader et al.
patent: 3659998 (1972-05-01), Saffron
patent: 4552526 (1985-11-01), Hafele
Chiesa Richard L.
Hoover Universal Inc.
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