Method and mould shooter for producing mould parts, such as casting cores, for casting moulds used to cast metal melt

Abstract

The invention relates to a method for the manufacture of mould parts, in particular of casting cores, for casting moulds for the casting of molten metal heats, wherein, in a shoot-moulding machine ( 1 ), with the aid of filling elements, such as shooting nozzles ( 8 ) and a shooting hood ( 6 ), material mould (F) containing an inorganic binding agent is filled into a cavity ( 12 ) of a mould tool ( 10 ) which determines the shape of the mould part (K) which is to be manufactured, wherein, heat is supplied to the mould material (F) filled into the mould tool ( 10 ), over a hardening period, in order for the mould material (F) to solidify due to the extraction of moisture, and wherein, during the hardening period, at least the filling elements ( 6,8 ) of the shoot-moulding machine ( 1 ), which contains mould material (F), and which are in a stand-by position during this hardening period, and are heated concomitantly by the radiant heat emitted by the mould tool ( 10 ), are kept at a moisture content level which prevents the solidifying of the mould material (F). In this way, mould parts for casting moulds can be manufactured reliably and with reduced defect incidence from a mould material containing an inorganic binding agent.

1 - 20 . canceled.  
     
     
         21 . A method for the manufacture of mould parts, in particular of casting cores, for casting moulds for the casting of molten metal, 
 wherein in a shoot-moulding machine a with the aid of filling elements, such as shooting nozzles and shooting hood mould material containing an inorganic binding agent is filled, into a cavity of a mould tool which determines the shape of the mould part which is to be manufactured,    wherein heat is supplied to the mould material filled into the mould tool over a hardening period, in order for the mould material to solidify due to the extraction of moisture, and    wherein, during the hardening period, at least the filling elements of the shoot-moulding machine which contains mould material, and which are in a stand-by position during this hardening period, and are heated concomitantly by the radiant heat emitted by the mould tool, are kept at a moisture content level which prevents the solidifying of the mould material, wherein at least one of the filling elements heated concomitantly is subjected during the hardening period at least temporarily to a moist atmosphere.    
     
     
         22 . The method according to  claim 21 , wherein the atmosphere is formed by moist air.  
     
     
         23 . The method according to  claim 21 , wherein the atmosphere contains a sufficient quantity of moisture to form condensation at the filling elements heated concomitantly by the heat from the mould tool.  
     
     
         24 . The method according to  claim 21 , wherein the filling elements heated concomitantly are the shooting hood and/or the shooting cylinder, into the interior of which the moist atmosphere is introduced.  
     
     
         25 . The method according to  claim 21 , wherein during the hardening period, at least temporary, at least one of the filling elements heated concomitantly is cooled.  
     
     
         26 . The method according to  claim 25 , wherein the filling element heated concomitantly is cooled to a temperature at which moisture condenses on it or in it.  
     
     
         27 . The method according to  claim 21 , wherein during the hardening period, at least temporary, at least one of the filling elements heated concomitantly is brought into contact with a moisture carrier.  
     
     
         28 . The method according to  claim 27 , wherein the moisture carrier is an absorbent material soaked with a liquid, in particular water.  
     
     
         29 . The method according to  claim 25 , wherein the filling element heated concomitantly is at least one shooting nozzle.  
     
     
         30 . The method according to  claim 21 , wherein in the course of the hardening time the cavity of the mould tool is flowed through at least temporary by a hot gas, which is delivered dry and extracted loaded with moisture.  
     
     
         31 . The method according to  claim 30 , wherein the gas is delivered via the shooting opening of the mould tool, provided for the introduction of the at least one shooting nozzle and is led away via the venting openings of the mould tool.  
     
     
         32 . The method according to  claim 30 , wherein the gas is air.  
     
     
         33 . A shoot-moulding machine for the manufacture of mould parts, in particular of casting cores for casting moulds for the casting of molten metal heats 
 with a mould tool having a cavity which determines the shape of the mould part which is to be manufactured,    with a heating device for heating the mould tool,    with filling elements for the introduction of mould material into the mould tool, wherein the mould tool can be moved relative to the filling elements and/or the filling elements can be moved relative to the mould tool out of a filling position in which they are arranged closely adjacent to one another for the filling of the mould tool, into a stand-by position in which they are positioned distant from one another, and    with a moistening device, which, with the filling elements located in the stand-by position, keeps those filling elements moist which contain mould sand and lie in the radiation range of the heat emitted by the mould tool, wherein the moistening device is connected to a gas supply, which delivers a moist gas to the moistening device.    
     
     
         34 . The shoot-moulding machine according to  claim 33 , wherein the moistening device comprises a moisture carrierwhich, with the filling elements in the stand-by position, is in contact with at least one of these filling elements.  
     
     
         35 . The shoot-moulding machine according to  claim 34 , wherein the moisture carrier is formed by an absorbent material soaked with a liquid, in particular water.  
     
     
         36 . The shoot-moulding machine according to  claim 33 , wherein at least one of the filling elements is equipped with a cooling device, which, with the filling element in the stand-by position, cools this filling element.  
     
     
         37 . The shoot-moulding machine according to  claim 33 , wherein a dry gas supply is provided, which can be coupled to the mould tool, which, with the filling elements in the stand-by position, conducts a dry gas through the mould material present in the cavity of the mould tool.  
     
     
         38 . A shoot-moulding machine designed in accordance with  claim 33  for the performance of the method according to claim  1