High pressure abrasive-liquid jet

Abstract

An abrasive-liquid jet cutting head comprising at least one mixing stage; a first mixing chamber arranged to accept a coherent high pressure liquid from an orifice and flow of accelerated abrasive particles from an abrasive feed tube and produce a pressurized slurry-like flow that enters a nozzle; wherein a nozzle to orifice ratio is in a range of about 1.2:1 to 2.49:1 wherein nozzle opening size to orifice opening size is 1.2 to 2.49 times larger in size.

1 . A abrasive-liquid jet cutting head comprising: 
 an orifice aligned to a nozzle;    at least one mixing stage;    a first mixing chamber arranged to accept a coherent high pressure liquid from said orifice and flow of accelerated abrasive particles from an abrasive feed tube and deliver said liquid and said abrasive into an inlet of said nozzle;    an abrasive liquid jet produced by said nozzle wherein a nozzle to orifice ratio is established in a range of 1.2:1 to 2.49:1 wherein nozzle opening size to orifice opening size is 1.2 to 2.49 times larger in size.    
   
   
       2 . An abrasive-liquid jet cutting head according to  claim 1  with liquid operating parameters at 0.1 gpm to 10 gpm at high pressures of 10,000 psi to 150,000 psi, and abrasive feed rates of 0.05 lb/min to 5 lb/min.  
   
   
       3 . An abrasive-liquid jet cutting head according to  claim 1  wherein said abrasive particles have a specific gravity of 4.0 and higher.  
   
   
       4 . An abrasive-liquid jet cutting head according to  claim 3  to wherein said abrasive particles metallic elements taken from a group consisting of metals, alloys, steel, metal oxides, and metallic carbides.  
   
   
       5 . An abrasive-liquid jet cutting head according to  claim 1  using an orifice with a coefficient of discharge between 85% to 99.99%.  
   
   
       6 . An abrasive-liquid jet cutting head according to  claim 1  using an orifice with a coefficient of discharge between 60% to 85%.  
   
   
       7 . An abrasive-liquid jet cutting head according to  claim 1  having a solid body for said cutting head is manufactured using injection molding and sintering techniques.  
   
   
       8 . An abrasive-liquid jet cutting head according to  claim 7  where the materials used for injection molding are hard ceramic materials, including oxides and nitrides, or hard carbide materials.  
   
   
       9 . A method for producing a high velocity abrasive liquid jet utilizing a cutting head with an orifice aligned to a nozzle with a defined nozzle to orifice ratio of 1.2:1 to 2.49:1, being that the nozzle is 1.2 to 2.49 times larger in size than the orifice.