Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1987-08-19
1989-08-08
Garrett, Robert E.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
291574, 29558, 100 93P, B23P 1526
Patent
active
048540269
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a process for the production of a press platen heatable by a fluid medium for platen presses used in making chip board, fiber board, laminated board and the like.
More particularly the invention relates to a method wherein a multitude of heating channels, running parallel to each other, are drilled in one direction in a steel plate and these heating channels are connected to collecting and/or return channels running transversely to the heating channels, according to a predetermined flow pattern for the fluid medium, and wherein deflection elements are inserted in the return channels and plugs are inserted frontally in the heating channels.
BACKGROUND OF THE INVENTION
In platen presses heatable press platens are commonly used. The platen press can be a cycle press or a continuous press. The fluid medium can be for instance steam, water or oil. Depending on the conditions which prevail during the production of chip board, fiber board, laminated board and the like, the fluid medium can also cause cooling.
Collecting channels define those channels which supply the fluid medium to the heating channels or evacuate the fluid medium therefrom.
The return channels define those connecting a plurality of heating channels, for instance in a meander-like manner, with the aid of inserted deflecting elements. In practice a great variety of flow patterns can be created. Sometimes, depending on the thickness of the platen, the channels are arranged on several levels.
In the generically known process as currently practiced, the heating channels are drilled first, and after the return channels or the collecting channels are traced, for instance by arranging particular components, the deflection elements are also inserted and are set against the steel platen. This is cumbersome.
However, it is also known to make bores in the steel plates already provided with heating channels, which will constitute the return or collecting channels. This creates difficulties, because the drills for the collecting channels or return channels are easily destroyed and/or deflected, as a result of their passage through the already open heating channels. In fact, in the modern fabrication, in order to obtain such bores, it is necessary to work with deep-hole drilling tools and corresponding drilling machines, whereby the drillings have to be removed from the cutting zone with considerable amounts of a lubrication medium.
When, during the boring of a collecting or return channel, the drill passes through an already-drilled heating channel, the lubrication medium can be discharged and the drill can have a dry run until it is destroyed and/or can be deflected. The circumstances are similar when the collecting or return channels are drilled first. Besides, it requires extraordinary efforts to insert the deflecting elements in the return channels made by this method.
OBJECT OF THE INVENTION
It is the object of the invention to provide an improved method of making a platen having the heating and other channels and free of the aforedescribed drawback so that the various bores can be easily made, without the danger that the drilling process will be disturbed because the drill has to pass through an already-made open bore. At the same time, the insertion of the deflecting components should be facilitated. It is selfunderstood that preferably deep-hole drilling tools and corresponding drilling machines are to be used for this operation, and that with a single machine, without interruption of the fabrication process, the heating channels as well as the collecting or return channels must be made.
SUMMARY OF THE INVENTION
The invention provides that the return channels or the collecting channels be drilled first.
Into the return channels or collecting channels prefitted cores are then inserted.
Thereafter the heating channels are drilled, thereby perforating the cores inserted in the return or collecting channels.
Then the drilled cores are extracted and, outside the steel plate, the cores assig
REFERENCES:
patent: 1790114 (1931-01-01), Schranz
patent: 1929824 (1933-10-01), Polley
patent: 3176387 (1965-04-01), Argueso
Averdick Gunter
Sandten Herbert
Dubno Herbert
G. Siempelkamp GmbH & Co.
Garrett Robert E.
Price Carl D.
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