DE1224258B - Cooling device in the mandrel of metal-processing cable jacketing presses - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

B 21 c

German class: 7b-ll / 80

Number: 1 224 258

File number: S 79908 I b / 7 b

Filing date: June 14, 1962

Opening day: September 8, 1966

For sheathing cable cores with metal, such as lead and especially aluminum, by means of a Extrusion press it is known, in the hollow Preßdornverschraubung a coolant such. B. water, to arrange through-flow cooling pipe, which extends into the pressing mandrel resting on the mandrel screw connection is enough to protect the heat-sensitive cable core passed through the cooling tube against harmful warming to protect. In general, the cooling tube consists of an inner and an outer tube, in the space between which the coolant is guided. Are advantageous between the interior and the Outer tube has two longitudinal or helical webs arranged around the coolant back and forth in the cavities formed by the webs to the press mandrel.

A well-known proposal provides for a hollow conical press mandrel, the end of the cooling tube Kegeüg to train and the cooling tube against the press mandrel and against the mandrel screw connection Application of spacing organs to be separated by a layer of air. The real lead the cable core takes place in this arrangement through the hot press mandrel.

A cable jacketing press is also known, in which a double-walled press through which the coolant flows Cooling tube is provided, which also has one end in the conical part of the press mandrel extends in, but rests directly on the press mandrel. The cooling pipe takes over in this Arrangement together with the hot press mandrel to guide the cable core. The disadvantage here is that the press mandrel and thus the press material heat is withdrawn and that also the hot tip of the Press mandrel comes into direct contact with the heat-sensitive cable core.

Furthermore, a cable sheathing press is known in which the cooling pipe carrying the coolant consists of three coaxial tubes, of which the inner one has an intermediate piece is screwed to the press mandrel. This intermediate piece also serves to hold a guide the cable core provided massive guide sleeve, which at the same time in direct metallic Is in contact with the hot press mandrel. As a result, there are also harmful effects of heat in this press on the cable core during the sheathing process is not excluded. Since also that middle tube of the cooling tube ends freely in the press mandrel, the coolant comes between the inner and the middle tube to the press mandrel and between the middle and outer tubes from Cooling device in the mandrel of metalworking cable jacketing presses

Applicant:

Siemens-Schuckertwerke Aktiengesellschaft,

Berlin and Erlangen,

Erlangen, Werner-von-Siemens-Str. 50

Named as inventor:

Walter Thele,

Bernd Schiewe, Berlin

Press mandrel is returned, with the hot press mandrel in direct contact, so that this and heat is withdrawn from the material to be pressed.

Finally, a press for sheathing cables is known in which the press mandrel protruding end of a cooling tube is fully walled and at a distance from the press mandrel is held. However, this known arrangement does not provide proper centering or guidance of the Cable core during the sheathing process.

The difficulties mentioned, which occur in the known cable jacketing presses when guiding the cable core in the vicinity of the press mandrel are overcome by the invention. the The invention is based on a cable jacketing press, in the pressing mandrel a cooling device is arranged is made up of a double-walled one arranged with a gap to the inner wall of the mandrel holder There is a cooling pipe for the passage of the cable core and in which the cooling pipe from the coolant up to the conical, closed one in the tip of the mandrel and leading to the cable core End part is traversed into it. According to the invention, the cooling device has a hollow cylindrical, single-walled extension on the conical end part of the cooling tube, which extends to the end of the mandrel tip extends and bears a heat insulating layer covering the conical end part on the outside. This is achieved that the cable core is properly guided into the tip of the press mandrel without the cable core damaged by the hot press mandrel or by the material to be pressed or the press mandrel and thus heat is withdrawn from the material to be pressed by the coolant.

609 659/135

I 224

The use of fiberglass fabric tapes coated with silicone rubber has proven to be expedient proven for the heat-resistant insulating layer. For the purpose of sealing the cooling mandrel against the pressing, mandrel, the conical part of the cooling tube is pressed sealingly against the hollow conical mandrel. For this a special clamping device is used. The hollow cylindrical part pushed into the hollow press mandrel including the heat-resistant insulating layer is dimensioned so that it is attached to the inner bore of the press dome is present.

The invention provides several advantages in the sheathing of oil cable cores, namely On the one hand, thermal protection is achieved between the press mandrel and the cable core up to the mandrel tip, and on the other hand it is avoided that during the evacuation of the cable core feed pipe inclusive the cavity between the cooling pipe and the cable core as well as the outer air jacket formation space through the cavity between the cooling tube and the mandrel screw connection to the Pressing tools flow and that then through 'the cable core feed pipe to the Pressing tools introduced oil can penetrate into said cavity.

An exemplary embodiment of the invention is shown in the drawing.

In a known manner, the mandrel screw 11 is screwed into the press body 10, which the in the mandrel holder 12 holds the mandrel 13 inserted in the prescribed position. Is on the base ring 14 the die 15 on. The press material introduced into the receiver, not shown, preferably Aluminum bolt, is passed through the press chamber 16 and the gap between the press mandrel and die pressed at a distance around the cable core 17 to form the jacket 18. When processing things that are difficult to compress Material, such as aluminum, becomes the parts of the extrusion press which are in contact with the press material strongly heated. The heat-sensitive cable core is very special due to the high temperature of the cathedral 13 endangered. For this reason there is a mandrel screw connection including press dome Cooling tube 19 used, which consists of the double-walled hollow cylindrical part 20, the double-walled conical Part 21 and the single-walled hollow cylindrical part 22 consists. The cooling tube is inserted so that a cavity 23 is formed opposite the cable core 17 and a cavity 24 is formed opposite the hollow mandrel 13 will. The space inside the double-walled cooling pipe 19 is divided by two in the circumferential direction longitudinal, diametrically opposed webs 25 divided into two longitudinal spaces, so that the through the coolant introduced into the pipe socket 26 flows into the one longitudinal space as far as the conical part 21, reverses there and flows off again through the other longitudinal space and the pipe socket 27. To at the same time harmful heating of the cable core by the hot press mandrel 13 and harmful cooling To avoid the dome 13 through the coolant, the cooling tube 19 is with its hollow cylindrical Part 22 extended to the Domspitze 13 ', which is not traversed by the coolant and against the dome 13 is thermally insulated by the heat-resistant insulating layer 28. ,

.In order to coat oil cable cores on the one hand, an evacuation and, on the other hand, an impregnation or filling of the cable core and the cavity 23 including the shell formation space

To achieve 29 with oil, in addition to the hollow cylindrical part 22, the conical part 21 of the cooling tube 19 with a heat-resistant insulating layer

30 provided, and it is also the conical part 21 of the Kühlronres against the internally designed hollow cone Press dome 13 pressed vacuum-tight by means of a special clamping device. The jig is through the brackets 31 screwed onto the press mandrel screw connection 11, through the Ring 32 welded to the cooling tube and formed by clamping screws 33. The hollow cylindrical one Part 22 of the cooling tube 19 including the heat-resistant insulating layer 28 lies on the inner bore of the cathedral 13 as close as possible. In this way it is achieved that when evacuating no cold Outside air can flow through the cavity 24 to the pressing tools and no oil when soaking enters through the cavity 23 into the space between the dome 13 and the hollow cylindrical part 22. Different of the example shown, the double-walled hollow cylindrical part 20 can also be in the hazardous area be provided with a heat-insulating insulating layer.

The sheath, which is pressed at a distance around the cable core, is z. B. by means of a drawing nozzle or a creasing or corrugating device, brought to bear.

Claims (2)

Patent claims: 1. Cooling device in the mandrel of metalworking cable jacketing presses, consisting from a double-walled one arranged with a gap to the inner wall of the mandrel holder Cooling pipe for the passage of the cable core, which runs from the coolant into a conical, in the mandrel tip adjacent and the cable core leading closed end part flowed through is, characterized by a hollow cylindrical single-walled extension (22) on the conical end part (21) of the Kühkohres (20), the extends to the end of the mandrel tip and on the outside a thermal insulation layer that also covers the conical end part (28.30) carries. 2. Cooling device according to claim 1, characterized in that the heat insulating layer (28, 30) consists of fiberglass fabric tapes coated with silicone rubber. Considered publications:
German utility model No. 1744 015,
1718 965;
French patent specification No. 958 288. 1 sheet of drawings 609 659/135 8.66 © Bundesdruckerei Berlin