Method for Producing at least One Component and Open-Loop and/or Closed-Loop Control Device

Abstract

The disclosure relates to a method for producing at least one, in particular metal, component, preferably a cylinder head, a nozzle body for a high-pressure injection pump, a component of a diesel injection engine, or a throttle disk, by means of low-pressure carbonitriding in at least one treatment chamber, which preferably can be evacuated, and an open-loop and/or closed-loop control device, which enables the setting of a specified ratio between a carbon concentration and a nitrogen concentration in a surface layer of the at least one component. In at least one treatment phase, a carbon-providing gas and a nitrogen-providing gas are simultaneously introduced into the treatment chamber. Based on a specified ratio between a carbon concentration and a nitrogen concentration to be absorbed by the at least one component in a surface layer of the component, a target value for the temperature and/or the pressure to be set in the treatment chamber is determined and is set in the treatment chamber for a specified time.

1 . A method for producing at least one metallic component in at least one treatment chamber, the method comprising:
 introducing, in at least one treatment phase, a carbon-emitting gas and a nitrogen-emitting gas simultaneously into the at least one treatment chamber   determining, in the at least one treatment phase, a target value for at least one of a temperature and a pressure to be set in the at least one treatment chamber, the target value depending on a specified ratio between a carbon concentration and a nitrogen concentration to be taken up by the at least one metallic component in an outer layer of the at least one metallic component; and   adjusting, in the at least one treatment phase, the target value in the at least one treatment chamber for a specified time.   
     
     
         2 . The method as claimed in  claim 1 , wherein the carbon-emitting gas is a first gas and the nitrogen-emitting gas is the first gas. 
     
     
         3 . The method as claimed in  claim 2 , wherein the first gas is an amine compound. 
     
     
         4 . The method as claimed in  claim 2 , wherein the first gas emits carbon and nitrogen in a ratio of less than or equal to three. 
     
     
         5 . The method as claimed in  claim 1 , wherein a ratio between a volumetric flow of the carbon-emitting gas introduced into the at least one treatment chamber and a volumetric flow of the nitrogen-emitting gas introduced into the at least one treatment chamber is less than three. 
     
     
         6 . The method as claimed in  claim 1 , further comprising:
 measuring the at least one of the temperature and the pressure in the at least one treatment chamber; and   correcting the at least one of the temperature and the pressure to match the target value.   
     
     
         7 . The method as claimed in  claim 1 , further comprising:
 activating a heating device in the treatment chamber to adjust the temperature to match the target value for the temperature the activating comprising:
 increasing the temperature of the heating device in response to the temperature being less than the target value for the temperature; and 
 decreasing the temperature of the heating device in response to the temperature being greater than the target value for the temperature. 
   
     
     
         8 . The method as claimed in  claim 1 , further comprising:
 setting a volumetric flow discharged from the at least one treatment chamber to adjust the pressure to match the target value for the pressure, the setting comprising:
 decreasing the volumetric flow in response to the pressure being less than the target value for the pressure; and 
 increasing the volumetric flow in response to the pressure being greater than the target value for the pressure. 
   
     
     
         9 . The method as claimed in  claim 1 , further comprising:
 changing the target value for the temperature in the treatment chamber at least once.   
     
     
         10 . The method as claimed in  claim 1 , further comprising:
 at least one of heating up the temperature and cooling down the temperature; and   equalizing the temperature after the at least one of the heating up and cooling down.   
     
     
         11 . The method as claimed in  claim 1 , further comprising:
 changing the target value for the pressure in the treatment chamber at least once.   
     
     
         12 . The method as claimed in  claim 1 , wherein the target value for the pressure in the treatment chamber is less than or equal to 100 millibar. 
     
     
         13 . The method as claimed in  claim 1 , wherein the target value for the temperature is between 650 degrees Celsius and 1050 degrees Celsius. 
     
     
         14 . The method as claimed in  claim 1 , wherein a plurality of treatment phases are performed, the plurality of treatment phases each being respectively separated from one another by a diffusion phase. 
     
     
         15 . The method as claimed in  claim 14 , wherein a specified ratio between a carbon concentration and a nitrogen concentration to be taken up by the at least one metallic component in an outer layer of the at least one metallic component is different in at least two of the plurality of treatment phases, depending on a specified carbon and nitrogen depth profile in the outer layer of the at least one metallic component. 
     
     
         16 . At least one of an open-loop control device and a closed loop control device for producing at least one metallic component in at least one treatment chamber, comprising:
 a controller configured to:
 introduce, in at least on treatment phase, a carbon-emitting gas and a nitrogen-emitting gas simultaneously into the treatment chamber; 
 determine, in at least one treatment phase, a target value for at least one of a temperature and a pressure in the at least one treatment chamber, the target value depending on a specified ratio between a carbon concentration and a nitrogen concentration to be taken up by the at least one metallic component in an outer layer of the at least one metallic component; and 
 adjust, in at least one treatment phase, the target value in the at least one treatment chamber for a specified time. 
   
     
     
         17 . The method as claimed in  claim 1 , wherein the at least one metallic component is at least one of a cylinder head, a nozzle body for a injection pump, a component of a diesel injection engine and a throttle plate. 
     
     
         18 . The method as claimed in  claim 3 , wherein the amine compound is at least one of an aliphatic monoamine, as primary, secondary and tertiary compounds, an aliphatic diamine, and a mixture of an aliphatic monoamine and an aliphatic diamine. 
     
     
         19 . The method as claimed in  claim 12 , wherein the target value for the pressure in the treatment chamber is between 2 millibar and 30 millibar. 
     
     
         20 . The method as claimed in  claim 13 , wherein the target value for the temperature is between 650 degrees Celsius and 960 degrees Celsius.