Device for producing cross-finned pipes

Details Device for producing cross-finned pipes Device for producing cross-finned pipes

1999-06-29

2000-11-21

Pyon, Harold

Plastic article or earthenware shaping or treating: apparatus

Sets of press couples comprising registering female mold...

4253261, 425336, 425384, 425388, 425392, 425396, B29C 4900

Patent

active

061494216

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention concerns an apparatus for the production of transversely ribbed tubes, with mold jaw halves which bear against each other along a common mold section with front faces, and form a mould passage.
An apparatus of that kind is known for example from German published specification (DE-AS) No 20 65 048. Along the common mold section, that apparatus has a stationary base plate which is provided with holes for the passage of a cooling agent through cooling passages provided in the mold jaw halves, and with vacuum holes which are in flow communication along the common mold section with vacuum passage which are provided jointly with the cooling passages in the mold jaw halves. The mold jaw halves are also guided along guide devices which are not described in greater detail.
A similar apparatus for the production of transversely ribbed tubes is known from EP 0 065 729 A1.
An apparatus of the kind set forth in the opening part of this specification is also known for example from German laid-open application (DE-OS) No 27 53 297 or U.S. Pat. No. 3,981,663.
The object of the present invention is to provide an apparatus of the kind discussed above, in which the mold jaw halves are of relatively low weight and are cooled in the optimum fashion, while insuring precise guidance for the mold jaw halves.


SUMMARY OF THE INVENTION

In accordance with the invention, in an apparatus of the kind discussed above, that object is attained in that each mold jaw half is connected at a first surface to a support element guided along a first linear guide device and at a second surface which is opposite to the first surface it is connected to a guide and slide element which is guided along a second linear guide device which is parallel to the first linear guide device, that the support element and the guide and slide element comprise the same material, that the associated mold jaw half comprises a material of relatively specific weight which has a high coefficient of expansion and a high coefficient of thermal conduction, and that the longitudinal extent of the mold jaw halves and the support elements and the guide and slide elements in the direction of the mold section are adapted to each other, with adaptation to the coefficient of expansion of the material of the mould jaw halves and the coefficient of expansion of the material for the support elements and the guide and slide elements, in such a way that the longitudinal dimensions of the mold jaw halves, the support elements and the guide and slide elements are equal at the operating temperature of the mold jaw halves.
In the apparatus according to the invention the first and the second surfaces of the mold jaw halves are preferably oriented horizontally and the front faces are oriented perpendicularly. The guide and slide elements are desirably fixed to the support elements. That fixing can be effected for example by screw connections. The mold jaw halves are preferably connected to the support elements by means of quick-action clamping devices so that it is possible in a simple manner, without involving a great deal of time, to replace existing mold jaw halves by other mold jaw halves in order to use the apparatus to produce transversely ribbed tubes of given dimensions.
The first linear guide device and the second linear guide device which is disposed in parallel relationship to the first linear guide device and along which the support elements of the mold jaw halves are linearly movably guided afford a good guidance action for the mold jaw halves, and that has a positive effect on the speed of forward movement of the mold jaw halves. A relatively high speed of forward movement of the mold jaw halves can also be achieved in particular if each mold jaw half has a cooling passage for a cooling agent, and if the first linear guide device has an elongate central cooling agent circulation portion which is in fluid communication through the associated support element with the cooling passage of the respective mold jaw half and, laterally there

REFERENCES:
patent: 3981663 (1976-09-01), Lupke
patent: 4492551 (1985-01-01), Hegler et al.
patent: 5257924 (1993-11-01), Dickhut et al.

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