DE733705C - Mandrel for continuous casting of metallic hollow blocks - Google Patents

Description

Mandrel for continuous casting of metallic hollow blocks In the known Proposals for the production of pipes or hollow blocks by continuous casting The continuous casting process is used to create the cavity of the molten cast and cast material that is steadily solidified uses a mandrel. If you use one fixed metallic mandrel, the solidifying melt shrinks onto the mandrel which is then usually damaged as the solidified strand moves on and consequently becomes unusable after a relatively short period of time. It is still known, a mandrel made of a refractory mass for continuous casting of tubes or hollow blocks and the cavity for the feed of the cast material to "use; that from the cavity through side openings into a through; the mandrel and the annulus that gives it its original, cooled shape flow out can.

The use of ceramic masses as well as carbon or graphite as a material for the mandrel has the advantage that the liquid metal Thorn surface not wetted. On the other hand, however, these masses have the disadvantage a low mechanical resistance, which is why one formed from them The thorn will soon tear off.

But since the continuous pouring requires devices that ensure the longest possible operation without any disturbance, comes the Design of the mandrel for the production of hollow blocks in the continuous casting process as well as the selection of the material for the mandrel is of particular importance. Of the Mandrel according to the invention is characterized by a long service life as well as by this from that a steady, trouble-free pouring is made possible with it. This is in achieved essentially in that the mandrel consists of a metallic core with a made of refractory mass or coal shell. Under the terms Refractories or coal boiled such materials as a whole to understand who, like the well-known ceramic masses, but also graphitized carbon or graphite. are not wetted by molten metals and iri iron and valley hut beings for similar purposes. are tried and tested.

Other features and advantages of the invention apply from the following Description in the reference to the accompanying drawing an embodiment is explained.

The mandrel shown in the drawing consists of an iron core i, the one with a tubular jacket expediently made from a graphitized carbon rod -2 is surrounded. It is advantageous that the wall thickness of the coal bottom #, according to because the lower end of the conically tapered mandrel -2 increases somewhat. At its lower At the end of the jacket a is supported by a plate 3, which is secured by a screw .M is connected to the iron core i.

The carbon element a can be drawn smoothly onto the iron core i3. However, it is more advantageous to use elevations in appropriate recesses of the iron core i to anchor, for example by helical elevations that engage in corresponding thread-like turns of the iron core, which is shown in the figure is not shown further. It is useful that the corridors of the iron core Because of the greater thermal expansion of carbon or graphite, kept somewhat larger - ,, verden than the thread-like elevations of the mantle to prevent the latter from tearing prevent.

In the upper part of the iron mandrel core is a recess for a Crucible-like vessel 5 is provided. This vessel can be made from any suitable Material consist, in the present case it is made of a graphitized carbon tube manufactured.

Above the pear-shaped space 6 of the bar-like vessel, a protruding bead 7 creates a constriction 8 which offers a free ring cross-section for the rising liquid metal 9 because the inflow pipe passes through it. Behind the constriction 8, the annular space ii widens again considerably, whereby it is achieved that the flow rate of the supplied metal decreases significantly.

In the side walls of the vessel 5 there are four openings 12, through which the liquid metal is advantageously pierced through carbon rings i3 and through corresponding openings provided in the carbon dumbbell through into the actual one Casting mold or ingot occurs. . @ n point of drainage of the liquid. Pouring poison through the side openings 1: can also be modified accordingly the outflow of the cast material takes place via overflow edges, which is shown in the figure itself is not shown.

Claims (1)

PATENT CLAIMS: i. Mandrel for the continuous casting of metallic hollow blocks into an annular cavity formed by the mandrel and the cooled mold surrounding it, characterized in that it consists of a metallic core (i) with a jacket (2) made of refractory or carbon. a. Mandrel according to claim i, characterized denotes Ge, that the core (i) of the mandrel consists of iron or steel. 3. mandrel according to claim i and a, dadurchgekennzeiclinet, (let the wall thickness of the jacket (-a) is increased to your lower end of the mandrel. Mandrel according to claim i to 3, characterized in that the jacket (2) through its inside provided elevations is anchored in corresponding, advantageously somewhat larger sized recesses of the core _ (i). 5. Mandrel according to claims i to q, characterized in that in its upper part a crucible vessel intended for receiving the liquid metal (5 ) is provided, from which the metal flows through lateral openings (12) or overflow edges into the casting mold Reduction of the flow velocity in front of the overflow edge or the lateral openings (12) 7. Mandrel according to Claim 5 and 6, characterized in that in front of the enlarged space (ii) of the crucible-like vessel A cross-section constriction (8) is provided. B. mandrel according to claim 5 to;, characterized in that an approximately pear-shaped space (6) is provided in front of the constriction (8) of the crucible-like vessel (5), into which a feed pipe (io) protrudes for the liquid metal.