Fluid abrasive machining method and apparatus thereof

Abstract

In a fluid abrasive machining method for abrasively machining a fine pore on a work ( 5 ) to be machined by supplying a slurry ( 7 ) which is an abrasive machining fluid from a supplying device ( 2 ) to the work to be machined comprising steps of: supplying the slurry to the work to be machined from the supplying device; measuring a first pressure (P 1 ) upstream in a discharge side of the supplying device; measuring a second pressure (P 2 ) downstream of a measuring point of the first pressure (P 1 ) and at an upstream side of the work to be machined; calculating a pressure difference (dp) between the first pressure and the second pressure; and terminating a machining operation when the pressure difference dp reaches a specific value. A fluid abrasive machining apparatus ( 100 ) which can perform the above-mentioned fluid abrasive machining method is provided.

1 . A fluid abrasive machining method for abrasively machining a fine pore on a work to be machined by supplying a slurry, which is an abrasive machining fluid, from a supplying device to the work to be machined comprising steps of: 
 supplying the slurry to the work to be machined from the supplying device;    measuring a first pressure upstream in a discharge side of the supplying device;    measuring a second pressure downstream of a measuring point of the first pressure and at an upstream side of the work to be machined;    calculating a pressure difference between the first pressure and the second pressure; and    terminating a machining operation when the pressure difference reaches a specific value.    
   
   
       2 . The fluid abrasive machining method as set forth in  claim 1 , wherein a control is performed so that the first pressure is always maintained at substantially constant during a fluid abrasive machining operation.  
   
   
       3 . The fluid abrasive machining method as set forth in  claim 1 , wherein a control is performed so that the second pressure is always maintained at substantially constant during a fluid abrasive machining operation.  
   
   
       4 . The fluid abrasive machining method as set forth in  claim 1 , wherein an object to be machined work is a fine pore of a fuel injector for a diesel engine.  
   
   
       5 . A fluid abrasive machining apparatus for abrasively machining a fine pore on a work to be machined by supplying a slurry, which is an abrasive machining fluid, to the work to be machined comprising: 
 a supplying device for supplying the slurry;    a measuring means for measuring a pressure difference between a first pressure at an upstream in a discharge side of the supplying device and a second pressure at a downstream of a measuring point of the first pressure and at an upstream side of the work to be machined; and    a terminating means for terminating a machining operation when the pressure difference reaches a specific pressure difference value.    
   
   
       6 . The fluid abrasive machining apparatus as set forth in  claim 5 , further comprising: 
 a first pressure sensor for measuring the first pressure; and    a second pressure sensor for measuring the second pressure.    
   
   
       7 . The fluid abrasive machining apparatus as set forth in  claim 5 , wherein the work to be machined is a fuel injector for a diesel engine.