Exposing substance, exposing method, and exposing device

Abstract

The invention relates to an uncovering compound for uncovering surfaces of materials with pronounced Si crystals, in particular of cylinder bearing surfaces made from aluminum materials with pronounced Si primary crystals. The uncovering compound according to the invention preferably includes very fine uncovering material, particularly preferably comprising silicon carbide grains with a grain size in the range from 4 μm to 0.1 μm and/or ceramic fibers comprising Al 2 O 3 , which is embedded in a visco-elastic plastic carrier compound. The invention also describes a process and a corresponding apparatus in which the uncovering compound according to the invention is used.

1 - 24 . (canceled)  
   
   
       25 . An uncovering compound, adapted in particular for uncovering cylinder bearing surfaces made from material with pronounced Si primary crystals, including: 
 a visco-elastic plastic carrier compound and an uncovering material which is embedded in the visco-elastic plastic carrier compound,    wherein the uncovering compound contains organic admixtures of cellulose, preferably of wood and/or sisal fibers, forming up to 60% by volume of the uncovering compound.    
   
   
       26 . The uncovering compound as claimed in  claim 25 , wherein the uncovering material consists of silicon carbide grains with a grain size in the range from 4 μm to 0.1 μm.  
   
   
       27 . The uncovering compound as claimed in  claim 25 , wherein the uncovering material consists of ceramic fibers.  
   
   
       28 . The uncovering compound as claimed in  claim 27 , wherein the ceramic fibers consist of Al 2 O 3 .  
   
   
       29 . The uncovering compound as claimed in  claim 25 , wherein the uncovering material consists of silicon carbide grains and ceramic fibers.  
   
   
       30 . The uncovering compound as claimed in  claim 25 , wherein the uncovering compound contains organic binders forming up to 40% by volume of the uncovering compound.  
   
   
       31 . The uncovering compound as claimed in  claim 25 , wherein the uncovering compound contains admixtures of starch flours forming up to 20% by volume of the uncovering compound.  
   
   
       32 . The uncovering compound as claimed in  claim 25 , wherein the uncovering compound contains admixtures of natural animal and/or vegetable fats forming up to 40% by volume of the uncovering compound.  
   
   
       33 . The uncovering compound as claimed in  claim 25 , wherein the uncovering compound contains admixtures of resins forming up to 20% by volume of the uncovering compound.  
   
   
       34 . A process for surface-machining a workpiece, in particular for uncovering cylinder bearing surfaces made from material with pronounced Si primary crystals, using uncovering compound, in particular for uncovering cylinder bearing surfaces made from material with pronounced Si primary crystals, including: 
 a visco-elastic plastic carrier compound and an uncovering material which is embedded in the visco-elastic plastic carrier compound,    wherein the uncovering compound contains organic admixtures of cellulose, preferably of wood and/or sisal fibers, forming up to 60% by volume of the uncovering compound, said process comprising the following steps:    roughing of the workpiece,    precision-turning of the workpiece,    uncovering using an uncovering compound which includes a visco-elastic plastic carrier compound and an uncovering material that is embedded in the visco-elastic plastic carrier compound, and which contains organic admixtures of cellulose, preferably of wood and/or sisal fibers, forming up to 60% by volume of the uncovering compound.    
   
   
       35 . The process as claimed in  claim 34 , wherein the uncovering step is divided into at least two or more uncovering steps using different uncovering compounds.  
   
   
       36 . The process as claimed in  claim 34 , wherein a recycling step is provided, in which case, after the uncovering has been carried out, the constituents of the uncovering compound(s) are separated, preferably cellulose constituents, fats and lightweight floating constituents and the heavier uncovering material are separated, by aqueous treatment of the used uncovering compound(s) by adding sodium hydroxide solution thereto and by settling and screening.  
   
   
       37 . An apparatus for surface-machining, in particular for uncovering cylinder bearing surfaces made from material with pronounced Si primary crystals, for, wherein the apparatus includes: 
 a spindle,    at least one rotating uncovering mandrel,    at least one storage chamber holding uncovering compound including a visco-elastic plastic carrier compound and an uncovering material which is embedded in the visco-elastic plastic carrier compound, the uncovering compound containing organic admixtures of cellulose, preferably of wood and/or sisal fibers, forming up to 60% by volume of the uncovering compound,    controllable elastic flat slides which can be matched to the contour of the workpiece to be machined, at least one helical swirl stage for supplying the uncovering compound,    a circulation system having a pump unit for delivering the uncovering compound from the at least one storage chamber into the at least one rotating uncovering mandrel, and having at least one return passage in the at least one uncovering mandrel for returning a used uncovering compound, and having at least one collection vessel for collecting the returned used uncovering compound.    
   
   
       38 . The apparatus as claimed in  claim 37 , wherein the apparatus includes a hollow cylinder which is integrated in the circulation system and can be controlled in such a way that it presses the uncovering compound, which is located between the hollow cylinder and that surface of a workpiece to be machined which is to be uncovered, onto that surface of the workpiece to be machined which is to be uncovered, in particular the inner wall of a cylinder, with a controllable prestressing pressure, the hollow cylinder having at least one further return passage for returning the used uncovering compound.  
   
   
       39 . The apparatus as claimed in  claim 37 , wherein the uncovering compound can be guided along a predetermined machining direction for the workpiece, in particular along the longitudinal direction of a cylinder bore of a cylinder to be machined, preferably through chambers in the at least one rotating uncovering mandrel.  
   
   
       40 . The apparatus as claimed in  claim 37 , wherein the apparatus includes a magazine feed system, it being possible for the uncovering compound to be held in tablet form in the at least one storage chamber and/or for the used uncovering compound to be ejected by an automated ejector system.  
   
   
       41 . The apparatus as claimed in claims  37 , wherein, if the apparatus is used to machine a cylinder, a center rest can be placed onto a cylinder opening before the at least one rotating uncovering mandrel is introduced into the cylinder.  
   
   
       42 . The apparatus as claimed in  claim 37 , wherein, if the material to be removed is aluminum, it can be used to achieve a material-removal volume of at least 0.1 cm 3  for an uncovering depth in the range from 0.15 μm to 0.8 μm.  
   
   
       43 . The apparatus as claimed in  claim 37 , wherein the apparatus has a ratio of a holding volume for the uncovering compound in the at least one rotating uncovering mandrel to a material-removal volume of material to be uncovered in the range from 1:20 to 1:100, preferably of 1:50.  
   
   
       44 . The apparatus as claimed in  claim 37 , wherein, as seen in the direction of movement of the at least one rotating uncovering mandrel, there is a separating membrane arranged in front of the uncovering mandrel for sealing off the workpiece from overflowing uncovering compound, it being possible for this overflowing uncovering compound to be returned.  
   
   
       45 . The apparatus as claimed in  claim 37 , wherein the apparatus can at least partially be set in micro-oscillation.  
   
   
       46 . The apparatus as claimed in  claim 37 , wherein the apparatus also includes a float device, a settling device and a screening device for recycling the uncovering compound.