DE1139089B - Sensor for metal extrusion - Google Patents

Description

GERMAN

PATENT OFFICE

H 34699 Ib / 7b

REGISTRATION DATE: NOVEMBER 3, 1958

NOTICE THE REGISTRATION ANDOUTPUTE EDITORIAL: NOVEMBER 8, 1962

It is known that the tangential, radial and possibly axial stresses, which in the case of a one-piece transducer on the inner bore wall a very cause high, radially outwardly decreasing stress, through multi-layer, shrunk Design of the transducer to be distributed over the individual layers so that the most stressed inner layer Relieved due to the shrinkage pressures, the less stressed outer layer, however, more to carry is used. The more complete the material utilization, the more perfect it is Bushes are provided.

With these transducers, the individual bushings are already in a cold state under shrinkage tension into each other. For the operation of such transducers, it has been proposed to use thermal protection to do without more or less to the outside, so that the transducer jacket remains cooler and on grand higher strength is more resilient.

The high-temperature strength of the steels currently available drops a lot at higher operating temperatures steeply down. The invention is based on the task of increasing the resilience of the transducer jacket and to be adjusted as precisely as possible in their height, in order to avoid any loss of operational safety in the material cross-section to save.

Accordingly, there is a temperature gradient occurring in a pick-up in the operating state of the or the in the usual way controllably heated, under shrinkage tension bushes for Scope of the transducer jacket the invention is that the sleeve or sleeves only in the operating state of the transducer are under shrinkage tension and this to the same desired extent due to the temperature gradient of the heated one or more Bushes to the circumference of the adjustable cooled by a cooling device is achieved transducer jacket.

The operating state is that in which the sensor for the introduction of the warm blocks of which or the cans is heated to operating temperature.

According to an older, not previously known proposal, among other things, the transducer jacket interspersed with heating rods surrounded by a cooling device. However, this does not serve to bring about just one in the operating state, the existing shrink-fit bushing, but has the sole purpose of preventing the effects of heat to prevent the centered storage of the pick-up unit.

The invention achieves that the relevant tangential tensile stresses are no longer present Sensor for metal extrusion

Applicant:

Hydraulics GmbH,
Duisburg, Mülheimer Str. 72

Dipl.-Ing. Albert Hertl, Duisburg,
has been named as the inventor

drop steeply from the inside to the outside, but have about the same size or a rise to the outside exhibit. Since the strength also increases towards the outside, there is thus a better utilization of the material achieved. The thickness of the transducer can therefore be less, which also saves space and costs will. The shrinkage stresses that occur can be compared to transducers with existing ones in the cold state Bushing shrink fit under changing operating conditions and different temperatures be kept relatively safely under control.

It is also particularly advantageous that the bushings can be easily replaced is because, in the cold state of the transducer, these are without a press fit in one another or in the transducer shell lie. This avoids the difficulties and potential for errors that occur in spite of the skill of specialists can occur. The invention thus meets the endeavor that Frequently required replacement of the inner sleeves, be it for reasons of changing the press program, be it due to wear and tear that has occurred quickly and without the risk of damage.

If, for example, the operating temperature of the inner liner is 550 ° C., then according to the invention the transducer jacket is heated to an average jacket temperature of about 250 ° C. Then the intermediate sleeve inserted cold, with enough play, and by heating it to its mean operating temperature of about 500 ° C is brought so that they are in the receiving hole of the transducer jacket Has shrink fit. Then the cold inner liner, which also results in play, is inserted into the intermediate liner introduced and heated to their operating temperature of 550 ° C.

209 680/12O

In order to maintain this shrink fit between the individual pieces created before the start of pressing Bushings of the transducer during the duration of the pressing operation is depending on the heat absorption or -delivery of the press block by continuing or interrupting the heating process the temperature of the Inner sleeve kept at the required height and by regulating the cooling device in the jacket this is cooled in such a way that the selected temperature difference is maintained.

The temperature monitoring and control, in spite of the predetermined temperature difference during operation to maintain the heat absorption or release of the press block, with known devices done automatically.

To remove the shrink fit between the inner liner and intermediate liner or jacket, around the To be able to easily remove and replace the inner liner, it is sufficient when the transducer has cooled down wait for the temperature to equalize between the inner sleeve and the jacket.

Claims (8)

PATENT CLAIMS: 1. Transducer for metal extrusions with a temperature gradient occurring in the operating state from the controllably heated, shrink- wrapped bushes to the circumference of the transducer jacket, characterized in that the bushes or bushes are only under shrinkage stress in the operational state of the transducer and this remains constant is achieved by the temperature gradient from the heated bushing (s) to the circumference of the transducer jacket, which is controllably cooled by a cooling device. 2. A method for producing the operating state according to claim 1 for a three-part Sensor with an internal operating temperature of 550 ° C, characterized in that the Sensor jacket preheated to an average jacket temperature of approx. 250 ° C, the intermediate sleeve inserted cold and heated to an average operating temperature of around 500 ° C brought in, then inserted the cold inner sleeve and brought it to its operating temperature of 550 ° C is brought. Considered publications: German Patent No. 928,641; "Metallwirtschaft" XXII, No. 30 to 32 of September 20, 1943, p. 445; "Archiv für Metallkunde" FT 1, January 1949, pp. 23 to 27; "Metal", 8th year, December 1954, issue 23/24, pp. 923 to 929. Legacy Patents Considered:
German patent no. I 051771. ® 20 »680/129 10.62