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About Abrasive water jet

• How Water jet Cutters Work

Water jet cutting works by forcing a large volume of water through a small orifice in the nozzle .The constant volume of water traveling through a reduced area causes the particles to accelerate .This accelerated stream leaving the nozzle impacts the material to be cut. The extreme pressure of the accelerated water particles contacts a small area of the work piece. In this small area the work piece develops small cracks due to stream impact. The water jet washes away the material that "erodes" from the surface of the work piece. The crack caused by the water jet impact is now exposed to the water jet the extreme pressure and impact of particles in the following stream cause the small crack to propagate until the material is cut through.
 
10 Reasons to Choose Abrasive Water Jet Machine


Long regarded as a tool for trained experts, abrasive jets have changed dramatically in the last few years. New technologies have made it possible for just about any machine or fabricating shop to purchase and profitably operate a precision abrasive jet cutting system, with little or no prior experience.
 

•     Wide Range of Materials

     
The Water-Jet can work with a wide variety of materials, ranging from metals to non metal such as ceramics, composites, glass-even marble and granite.
       

•     Quality Finish     

The finish provided by the water Jet Machine is a smooth sandblasted finish. No rough edges, burrs or jagged ends.
       

•     No Heat in Machining Process

 Because the abrasive jet uses water and abrasive, the material is not heated up significantly during the cutting process. This makes the Water Jet Machine ideal for materials that are affected or deformed by heat, such as titanium.
       

•     Environment friendly

The Water Jet Machine uses water and garnet to cut. Garnet is an inert gemstone, which can be disposed of in the municipal waste stream. No toxic fumes are produced during machining.
       

•     No tool changing

You don't need to change cutting tools with the Water Jet Machining. One nozzle is used to machine all the different types of materials and shapes, saving time and the expense of multiple cutting tools.
       

•     Minimal burr

Using the abrasive jet, there is little or no burr in most materials.
       

•     Quick to program

The Water Jet Machine comes complete with a comprehensive CAD program (called Layout). You can draw parts from scratch in Layout, or import standard   files created in other programs.
       

•     Fast set-up and programming

'Make' is the other main program provided as part of the DARDI Jet Machine.'Make' takes the tool path created by Layout and calculates the exact position and cutting speed of the nozzle at a resolution of over 2,000 points per inch (800 points/cm).

•     Complement Existing Tools, Used for either Primary or Secondary Operations

 The Water Jet Machine can also work with your other machine tools to take advantage of the unique capabilities of each. An example of this is roughing out nested parts on the water jet to maximize material usage, and then performing final machining on a mill or machining center.

Advantage of waterjet cutting over lASER cutting
     

•     Can cut many materials LASER cannot
•     Gives the same or better tolerances/accuracy
•     Can cut thicker materials
•     Makes uniformity of material less important

   
    Advantage of waterjet cutting over EDM cutting
     

•     Is much faster.
•     Is able to cut wider range of materials.
•     Makes uniformity of material less important.
•     Does not heat the surface.
•     Creates no heat – affected zone.

   
    Advantage of waterjet cutting over Plasma Cutting
     

•     Produces a nicer edge finish.
•     Does not heat the part.
•     Is more precise.

   
    Advantages of waterjet cutting over flame cutting
     

•     Produces a nicer edge finish.
•     Does not heat the part.
•     Is more precise.

    Advantage of waterjet cutting over Milling Cutting
     

•     Needs no tool.
•     Can machine brittle, pre-hardened and difficult materials.
•     Can produce more parts out of same material.

   
    Advantage of waterjet cutting over Punch Press Cutting
     

•     Is better on thick materials.
•     Is better on brittle materials.
•     Is better on hardened materials.

Why abrasive water jet?
     

•     No heat process
•     No structural deformation
•     No burrs
•     No melting
•     No micro cracks
•     No gas fumes
•     No dripping slag
•     No frayed edges
•     No cutting oil
•     No chips
•     Material savings
•     Sharp corners / bevels
•     No cutting tools
•     Wide range of material can cut
•     Minimum fixture required
•     Eliminate secondary process

   
 How much thick material abrasive water jet cutting machine can cut?
     
This can range anywhere from a 0.1 mm up to 300mm thick. It varies with the softness or hardness of the material being cut. Hard materials are normally cut up to 150mm thick. This does not mean Stainless Steel or stone with a higher thickness cannot be cut with a waterjet. It all depends on the purpose for which cutting is done (i.e. prototype, production, etc.), system’s operating conditions, HP Pump capacity and on the desired cut finish. It also depends on how long you are ready to wait for nozzle travel, as and when thickness increases, cutting speed decreases. For all materials, adjustments can usually be made to produce required results and if needed higher capacity pump is used. Following list shows possibilities of cutting different material:


What points should we consider for selecting a model?
     

•     Application details
•     Material to be cut
•     Size of Material
•     Thickness of Material

   
How much Positional Accuracy can Waterjet give?
      Our machine can give ≥ ± o.1mm positional accuracy.
   
 How much shall be the kerf width? Is there any special arrangement for saving material?

It is ≥ 1mm. Our software has Nesting feature so material saving is possible by part in part cutting, close nesting, common cut, etc.