DE2212575B2 - METHOD AND DEVICE FOR THE PRODUCTION OF CAST IRON WITH BALL GRAPHITE - Google Patents

Description

2. The method according to claim 1, characterized in that the difficulty arises that under the indicates that the effect of heat from the protective layer protrudes from the protective layer Body through a refractory bake with the stopper rod tends so that the GeMaterial encased stopper against the liquid driving that there is when lifting the stopper rod Iron shielded and the treatment partially carried away or destroyed by the protective layer Lifting of the plug is initiated. and therefore the actual contact area

3. Device for carrying out Cs method 30 between melt and magnesium not reliable rens according to claim 2, characterized in that it can graze in a predetermined manner.

that the plug (23) on its underside is also the complete covering of the ma-

Has recess (27), which is made of the magnesium-containing chamber at the bottom of the pan Protective layer (26) protruding part of the body by means of a plate filled by a stopper bar g pers (24). 35 known (British patent 713,469). In this

4. Device for carrying out the procedure. The size of the contact surface is not freely selectable according to claim 2, characterized in bcr, but by the dimensions of the chamber that in the plug (39) a mechanical or ma- determined. In addition, the sealing of the magnetic table, detachable retaining device for the siums in relation to the melt by a movable one Body (34) is arranged. 40 Plate quite insecure, so that there is a risk that

z. B. as a result of a broken point on the edge of the chamber or one trapped under the plate

Foreign body starts the reaction prematurely. at

Use of a protective layer made of calcium carbide

45 was in Swiss patent specification 500 284

also suggested through a porous plug

The present invention relates to a method of gas under pressure from the outside of the ladle and to initiate a device for melt treatment of and thereby the protective layer from below To break cast iron for the production of cast iron with cow. Furthermore, it's not a new one gel graphite, in which the contact between 50 protective layer of calcium carbide from the outside means To destroy melt and metallic magnesium or a rod ("Gießerei" 56 (1969) p. Magnesium alloy with a protective layer of 419). The destruction of the protective layer of calcium granular calcium carbide and one during a carbide by mechanical or pressure means Prevented a predetermined time effective coverage results in a precisely to be determined in advance will. 55 Time of initiation of the reaction or the

It is from the German Auslegeschrift 1262 313 act, but can lead to undesirable under-known, magnesium or magnesium alloys in different ways in the course of the reaction because of the a bulge in the bottom of a ladle with treatment introductory cross section of the opening a protective layer of granular inoculum and in the protective layer there are large variations between one another Cover made of steel chips or pieces of steel 60 lies.

to cover. The implementation between magnesium The present invention aims not

and the liquid cast iron is delayed when only initiating the reaction via a pre-fill the pan until the cover is correct time to delay, but also the size and protective layer by the liquid iron on the interface between the liquid iron is dissolved and access to the magnesium can take place 65 and the magnesium alloy depending on the requirements. Choosing the delay time until the rulings occur and being able to reliably adhere to it, action between the liquid iron and the Ma- The task described above is carried out according to the

In this method, magnesium cannot exactly solve a present invention through the combination

3 ⁴

The following molten iron 10, which is liquid in processes of the type mentioned at the outset, is at the pouring point 7 known measures: to be filled in so that the protective layer 6 is not destroyed

a) for the cover a body made of iron is used ^mr ^ _Arbeitswe j _se the treatment of cast iron or an iron alloy is used in the. ^ _{followc,. de} . _The magnesium or the magnitude predetermined time through the filled fluid <.;' _urn ieeieruneen (for example, magnesium silicon

_n ^s j8 ^e leg irons melts,. _or MagneLm ferrosilicon) is used in the

b) the Abdeckkorper is cylindrical or prismatic filled ₇ in the bottom of the ladle. 1 In this table and "-rd into the protective layer, inserting this through- _we 3 ^ _e r grains 4 in the shape of a cylinder, e · ^; ibed. _{1O sets} . The protective layer 6 is expediently

The essence of the invention is thus applied in such a way that its top is in one plane choice of the appropriate procedural measures and with the top of the body 4 lies. According to the their combination in the aforementioned sense. This basic idea of the present invention is the is achieved through that on the one hand the contact surface treatment by simply filling in liquid carried out in a simple manner by choosing the dimensions 15 iron at the pouring point 7. Through Bedes Cover body varies and on the other hand, measurement of the body and the protective layer and can be determined in advance and adhered to, the actuation of the plug 3 success. the definition by the protective layer when melting de. From - the delay time, i.e. the period of time from the cover body no mechanical stress from the beginning of the filling until the onset of the reaction, learns. so by using the plug, its underside

In order to set the delay time even more precisely, the body is completely covered, the

to be able to, it is advisable to increase the protection time until the onset of the reaction,

layer protruding through a body with there only by lifting the stopper by means of the par-

refractory material encased stoppers e

to cover liquid iron and treatment begins by 25 melting and after a predeterminedii

Initiate digging of the plug. Time with which magnesium comes into contact.

A device for carrying out the method F i g. 2 shows a second embodiment in which

rens for the production of cast iron with spheroidal graphite, the ladle 1 at its bottom a partition

consists of a pouring ladle, the bottom of which has at least 22, which on one side of this

at least one recess in which the partition wall for loading a recess for filling in the material

The necessary amount of magnesium or magnesium or magnesium alloy 5 is produced.

Magnesium alloy takes place. Expediently, the body 4 is in this way in the magnesium or

wisely, when using such a casting, its alloy is placed in that the upper part

pan with a raisable and lowerable, protruding on all sides through the body 4 over the protective layer 6,

refractory material encased stopper on the stopper 35 The stopper 3 from the stopper core 8 and refractory casing

a recess is provided on its underside, clothing 3 can be lifted through the parallel guide 9

which protrude from the protective layer ben or are lowered. The plug 3 points to its

Part of the body can accommodate; This creates a recess 27 on the underside, which is large

the body opposite the molten iron is initially enough to protrude beyond the protective layer.

also shielded. 40 lowering part of the body4. In Fig. 2

The drawings show exemplary embodiments, with 7 the pouring point for the molten iron 10

Device for carrying out the method, and denotes,

although: F i g. 3 shows a section from FIG. 2 with one

F i g. 1 shows a section through a first execution retaining device for the body 4. The retaining device

shape, the device can be operated mechanically or magnetically

2 shows a section through a second embodiment. The embodiment of FIG. 3

rungsform, shows a magnetic retaining device with

Fig. 3 shows a detail from Fig. 2, the lower a magnet 36, which by a ceramic

Representing part of the stopper. Protective wall 35 against influences of the molten iron

In Fig. 1, a ladle is denoted by 1, 50 is protected. A rod 38 can be used in well-known or in a known manner, the magnet 36 is brought into action in the ground Has nete recess 2. The ladle 1 is to be rendered ineffective. The whole clinging to one Stopper 3, which consists of a stop device, is arranged inside the stopper 3 fenkern 8 with ceramic, refractory cladding and serves to the body 4 after its insertion consists. The stopper 3 is to be held on a parallel guide in the recess 27, up to FIG tion 9 attached. In Fig. 1 is the metallic magnet F i g. 2 the filling of magnesium 5 and protective sodium or the magnesium alloy is denoted by 5. Layer 6 are finished. Before taking off the stop-one Protective layer 6 made of granular calcium carbide fens 3, the magnet 36 is covered by the rod 38 the magnesium or its alloy. Made the answerless.

1 sheet of drawings

Claims (1)

1 2 are held because various influences, such as claims: z. B. temperature of the liquid cast iron, thickness of the protective layer and temperature of the ladle, the 1. Process «- to influence the melt treatment of casting delay time. The strong swan iron for the production of cast iron with a 5 kende delay time is an orderly one graphite, in which the contact between the melting plant is also disadvantageous because the Ma-Schmelze and metallic magnesium or magnesium output is subject to strong fluctuations, a magnesium alloy by a protection. Furthermore, it is state of the art in a method layer of granular calcium carbide and of the aforementioned kind for the covering an effective for a predetermined time in a compact body made of steel or cast iron Cover is prevented from being used in the form of a plate or hood marked (indicates by combining the following at see laid-open specification 1433 538); also here According to the above generic term, the delay time can be derived from the above known measures: Do not adhere to the reasons precisely enough. a) a body made of ^{15 is used for the cover It was} _u ^{with the} ^ ™ Nahrungsmittel * !? ^Patentsch J ^ft iron or an iron alloy used, ⁵ P ⁰² ** ^auth suggested the magnesium or the in the predetermined time by the a «« Jf. Magnesium alloy with a protective filled liquid cast iron melts, ^Schlcht · z. B calcium carbide, and one of these protective , .j.,. ..?. ... .. , 'layer-penetrating, refractory stopper rod b) the Abdeckkorper is used in a cylindrical or _{ao first} cover and after a predetermined prismatic shape, and pull in _{time the refractory} stopper rod for the protective layer, this by putting, _{the melt} eingebet- _{the contact with the} magnesium in ^tet · at a predetermined time enable.