Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Patent
1986-04-01
1988-06-28
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to heat or cool
2643288, 26432814, 425549, 425572, 425588, B29C 4574
Patent
active
047535920
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus for producing plastic parts formed of thermoplastics, duroplastics and/or elastomers by the injection molding or reaction injection molding technique. The apparatus has one or a plurality of locking units of the horizontal or vertical design for receiving one or a plurality of molds arranged on one plane, and an associated injection unit for successively injecting the molds, in which each half of a mold is arranged on a mold-clamping plate with one of said plates being movably arranged in each case.
2. Description of the Prior Art
Devices are known in which several locking units are associated with the injection unit which is displaceable on one plane, or in which the injection unit is arranged stationary and the locking units are displaceable on one plane.
The molding of the molded parts requires cooling periods as a result of the nature of the molding process. Therefore, also multi-station devices are used in the manufacture of large series. Such multi-station devices are suitable for producing plastic parts with small or medium dimensions, but less suitable for the manufacture of larger parts. The use of mobile production plants for the manufacture of large molded parts is uneconomical. For producing one single large molded parts in large numbers, several individual devices are required, which require extensive equipment, much setup space and much energy.
With the devices of the known type, the full mold-clamping or mold-closing forces are required for injecting each individual mold of the molds disposed on one plane, i.e., the full forces rated for the technique. This means that high energy-intensive mold-clamping forces may be required depending on whether the high-pressure or low-pressure technique is employed.
SUMMARY OF THE INVENTION
The object of the present invention is to economically mass-produce high-quality plastic parts from thermoplastics, duroplastics (thermosetting plastics) and elastomers, in particular flat molded parts with large surfaces and thin walls of high quality by injection or reaction injection molding with a minimum of equipment, setup space and energy requirements.
A solution to this problem is a prerequisite for the use of new high-quality plastics for new fields of application. This includes, among other things, the use of high-quality chemical materials with a custom-made profile of properties for exterior and interior parts in automobile body construction. The advantages connected therewith with respect to weight savings, freedom from corrosion and improved function as well as unlimited design possibilities particularly for injection-molded auto body parts are highly significant for future auto body construction. In the future, the subassemblies of parts or components, which, until now, have been welded together from a number of individual sheet metal parts, will be combined from a much lesser number of individual parts to form an assembly or unit of plastic parts. High-quality plastic auto body parts open up entirely new possibilities. The improvements in function connected with the use of high-quality chemical materials, furthermore, will significantly help to satisfy the stricter requirements with respect to vehicle safety and economy.
Plastic auto body parts are supporting and grid-type parts with large surface area and volume, as well as exterior and interior linings which, in most cases, have a flat shape. Said parts have to be economically produced in great numbers with a narrow width of manufacturing tolerances and excellent quality.
According to the invention, said problem is solved with the help of a multi-station locking unit comprised of one or a plurality of 2-stage locking units of the horizontal and/or vertical type of design, whereby each 2-stage locking unit has two mold stages, with two movable mold-clamping plates and one fixed mold-clamping plate being associated with each mold stage, said movable mold-clamping plates being movable horizontally or v
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