DE1950987B2 - Method and device for the production of castings from alloys of metals and gases - Google Patents

Description

3. The method according to claim 1 or 2, characterized in that to solve this problem, the Erfingekmarks conveyed, that immediately after the filling 3 ° a process according to the patent application the casting mold with the melt the connection worked with the space for the melt different gases, one of which is common and the overpressure of the gaseous medium relative to the alloying process is inert and the other to be active suddenly in the space for the casting mold in relation to the metal The active gas is located is increased. 35 in the gas mixture above the melt in relative

4. Device for carrying out the process- low concentration before. Since the solubility of the gas in the melt depends on its partial pressure, containing two separate, hermetically sealed chambers, according to the invention, saturation can be achieved, one of which is a container at relatively low pressure. In the ter with the molten metal and the other the 4 ° chamber for the casting mold, on the other hand, is the partial casting mold. contains, characterized in that pressure of the active gas substantially higher, so that to each de _t chambers (2, S) respectively avoided gesonder- withdrawal of the gas from the solidifying Gießlinter pressure gas container (8, 9) gene for the respective gas- can be. Since the other compo-shaped medium is connected. component of the gas mixture compared to the alloying

5. Apparatus according to claim 4, characterized by +5 process is inert, the total pressure of the gas can be characterized that the container with the metal mixture in spite of the desired different melt (1) above the chamber (5) for the casting partial pressure of the active gas in both chambers Form (4) arranged and hold the feed pipe (3) from the same value.

The bottom of the melting vessel goes out and with The invention is described in the following

a stopper (18) can be closed. 50 writing of preferred embodiments of a

Casting device explained in more detail with reference to the drawings; in the drawings shows

F i g. 1 a device in which the melt is poured into the casting mold under the action of gas pressure promotes, and

The invention relates to a method and a fig. 2 a device in which the melt unVorrichtung for the production of castings from lead alloying the effect of gravity into the casting mold of metals and gases, which is enough.

Melt and the casting mold in separated before casting- In a hermetically sealed and heat-isot, There is a hermetically sealed space in each case, an unlated or heated chamber 2 ter the overpressure of the gaseous medium held container for the melt 1. It is supplied by a will. tube 3 connected to a mold 4, which in turn It is known that some gases in the form of a fe- in another hermetically sealed Kamsten Solution or as a chemically bound compomer5 is arranged. To open or Unterbrenente in the structure of metals, their properties of connection between the two chambers can influence favorably. A typical boilers 2, S are a valve 6 and 6 in the feed pipe 3 play for this is nitrogen, which is provided in a number of LE a locking member 7, which in a known manner Alloys based on iron-based structures can be improved with.

950 987

^ • - ,, a Pnrm onset of crystallization of the

In two containers 8 and 9 are each filled with the _partial pressure of the acter pressure gas mixtures differing concentration melt ^νο1 ^ ^ίΕ " ^ω \ ^ _the gas that has already been dissolved from i over the casting i tive gas duration hi

The pressure of gas mixtures differed in concentration from the gas _that had already been dissolved

ions from a gas that is inert towards the casting process. Duration _. ^ ₂₆ nj _c h _{t more} hr emwei-

and an active gas. Fin circulation re-crystallize lOen ^ - _{By balancing the}

10 dit Rii d G 5 chen and remains m in o ^ _{FÜU d}

and an active gas. Fin circulation re-the crystallize 10 _{By balancing the}

Generation system 10 is used to purify the gases, 5 surfaces and remains m in o ^ _{m after the FÜUung of} which are returned from the chambers 2.5 for the melt or the pressure in the J * ioen ^ _{melt via the Zj} _ casting mold, as well the <i ^D "" E. _& melt return of the gases to containers 8 and 9 is used as return _form . nienge and pressure of the gas streams through VEN and the blocking "s _{of the gk & vm gas}

tile η to 17 controlled. Ristalli- "If the experience dictate" ^r _{End of K}

The process proceeds as follows: When in the chamber 5 afterwards ms ζ

closed locking member 7 and open valve 6 sation are increased. ^ of _{the form 4}

is by opening the valve 12, the chamber 2 with The removal of the Ui ^ ^ ^^^ _g

the melt 1 with the gas mixture from the container takes place after the a * u _circulation . _Regeneri be eter8, with the treated melt sol), _eitet _RF by the ^ν ^ ^ω "? 15 _and back to the Begefüllt. It is desirable that the feed ^back of the insurance system 10 S ^e f ^liei gas mixture through the melt by means of a holder 9 has been fed *. Casting _{mold and}

Tube 11 or a porous wall in the bottom of Em After renewed ^e ^ j £ _{tandes the} AnTiegels occurs slowly proceeds, so that restoration of the em ^ S repeat

good mixing of the gas with the melt ge * o situation! it is possible den_Gieövo g S ^ _Mre - _{m is} guaranteed. At the same time, the valve during r ianzen ^ time w u * _melt χ _not 13 of the chamber S with the casting mold 4 the gas of the chamber 2 of the container ^ rur ^^

mixed supplied from the container 9. Exchanged in this case. Only the printing ^ _{the process step preparatory to casting} are the prints in the varies, so the W ™haben * . Accordingly

two chambers 2 and 5 the same size, so that by "5 form respectively ™ ^ ^e ° * _{s of the} gas from the opening of the locking _O rgans7 not promote enters the Venn% ™ ** g? fg ^ the Metail melt is caused . Chamber 2 only after ™ mg

By shutting the valve 6 and increasing the melt from the ^ container in aku ^

Pressure in the chamber 2, the melt by the apparatus of J ¹ 1 _but | _finds

the feed pipe 3 is pressed into the casting mold 4, which fills _{30 basic elements such as the nacn r ^, melt.} If the concentration of the active gas is ^ώ ^ ™. ^ ¹ ₄ % Τ ^ ΐ £ of the melt in the container 9 or in the chamber 5 and in the above the casting mold J- "? ™ plug mechanism casting mold 4 is considerably higher than that in the container with ^^^ J ^ S ^ aSo of the container 8 and in the chamber 2, it is not possible that mus 18 ge ^^! ^ is possible and to open the metal melt during the short duration 35 days ^ ^r _h J "2? ^ / 5?" to Bodea this bedes filling the mold considerably with gas and closing an outlet in the enriched. In contrast, this takes place immediately after the holder is used.

1 sheet of drawings

Claims (2)

1 2 or creates new properties. On the other hand, it is known that metals in the liquid state can dissolve significant amounts of gas while 1. Process for the production of castings this ability in the solid state is considerably lower made of alloys of metals and gases, where 5 is. This peculiarity leads to the UieJJen that the melt and the casting mold in the gases dissolved in the molten metal prior to casting, Hermetically sealed spaces are each rigid in the form of bubbles and micropores divorce under the overpressure of a gaseous. Medium are held, thereby gaining From the German Auslegeschnft 1 1/8 y / 9 and indicates that the gaseous medium io similar from French patent 1,495,475 In the space for the melt a gas mixture are known processes in which the casting process is used, which consists of a pressure of the fur, which is kept constant compared to the pressure of the fur Alloying process inert and a gas used against the alloy is carried out. the metal active, partly in the melt soluble and as a constituent in the composition 15 the above-mentioned difficulty that when solidifying Settlement of the alloy consists of existing gas, the castings the solubility of the gas in the calci- that sinks as a gaseous medium in the space for tend melt and the gas during this the casting mold eliminates at least the aforementioned active solidification process and casting defects Gas is used and that causes the concentration. If you wanted this excretion of the gas of the active gas in the space for the casting mold 20 from the cooling melt would have to prevent is kept at a higher value than in which the casting following the actual casting Space for the melt. Process exposed to an even higher gas pressure 2. The method according to claim 1, thereby becoming what is practical in the industrial foundry indicates that in is not possible as a gaseous medium. the space for the casting mold is also a gas 25 The invention is based on the object mixed is used, the occurrence of micropores or bubbles from the active gas and a setting of castings made of alloys from Metalerten compared to the alloying process Gas exists. ien and gases to be avoided.