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rther shaped by the aviation automotive and oil industries aircraft manufacturers such as boeing developed seals for hydraulically boosted control systems in the 1940s 14 while automotive designers followed similar research for hydraulic suspension systems 15 higher pressures in hydraulic systems in the oil industry also led to the development of advanced seals and packing to prevent leaks 16 these advances in seal technology plus the rise of plastics in the post war years led to the development of the first reliable high pressure pump the invention of marlex by robert banks and john paul hogan of the phillips petroleum company required a catalyst to be injected into the polyethylene 17 mccartney manufacturing company in baxter springs kansas began manufacturing these high pressure pumps in 1960 for the polyethylene industry 18 flow industries in kent washington set the groundwork for commercial viability of waterjets with john olsen s development of the high pressure fluid intensifier in 1973 19 a design that was further refined in 1976 20 flow industries then combined the high pressure pump research with their waterjet nozzle research and brought waterjet cutting into the manufacturing world citation needed abrasive waterjet edit the evolution of the abrasive waterjet nozzle while cutting with water is possible for soft materials adding an abrasive turned the water jet into a modern machining tool for all materials this began in 1935 when the idea of adding an abrasive to the water stream was developed by elmo smith for liquid abrasive blasting 21 smith s design was further refined by leslie tirrell of the hydroblast corporation in 1937 resulting in a nozzle design that created a mix of high pressure water and abrasive for the purpose of wet blasting 22 today there are two different types of abrasive waterjets abrasive water suspension jet awsj cutting edit the abrasive water suspension jet awsj often called slurry jet or water abrasive suspension was jet is a specific type of abrasive water jet which is used for waterjet cutting in contrast to the abrasive water injector jet awij the abrasive water suspension jet awsj 23 is characterised by the fact that the mixing of abrasive and water takes place before the nozzle this has the effect that in contrast to awij the jet consists of only two components the water and the abrasive since there are only 2 components water and abrasive in the awsj the acceleration of the abrasive grains by the water takes place with a significantly increased efficiency compared to the awij 24 the abrasive grains become faster with the wass than with the wais for the same hydraulic power of the system therefore comparatively deeper or faster cuts can be made with the awsj awsj cutting in contrast to the awij cutting process described below can also be used for mobile cutting applications and cutting underwater in addition to machining demanding materials 25 26 23 examples include bomb disposal 27 as well as the dismantling of offshore installations 28 or the dismantling of reactor pressure vessel installations in nuclear power plants 29 abrasive water injector jet awij cutting edit this section needs more citations please help improve this section by adding citations to reliable sources unsourced material may be challenged and removed may 2023 learn how and when to remove this message the awij 30 is generated by a water jet that passes through a mixing chamber a cavity after exiting the water nozzle and enters a focusing tube at the exit of the mixing chamber the interaction of the water jet in the mixing chamber with the air inside creates negative pressure the water jet entrains air particles this negative pressure is used for the pneumatic transport of the abrasive into the chamber the abrasive is led to a lateral opening bore of the mixing chamber by means of a hose after contact with the abrasive material in the mixing chamber with the water jet the individual abrasive grains are accelerated and entrained in the direction of the focusing tube the air used as a carrier medium for transporting the abrasive into the mixing chamber also becomes part of the awij which now consists of three components water abrasive air in the focusing tube which is should be optimised in its length for this purpose the abrasive is further accelerated energy transfer from the water to the abrasive grain and the awij ideally leaves the focusing tube at the maximum possible abrasive grain speed waterjet control edit as waterjet cutting moved into traditional manufacturing shops controlling the cutter reliably and accurately was essential early waterjet cutting systems adapted traditional systems such as mechanical pantographs citation needed and cnc systems 31 based on john parsons 1952 nc milling machine and running g code 32 challenges inherent to waterjet technology revealed the inadequacies of traditional g code citation needed the accuracy depends on varying the speed of the nozzle as it approaches corners and details 33 a major breakthrough came in the early 90s when john olsen developed systems to precisely position the waterjet nozzle while accurately specifying the speed at every point along the path and using common pcs as a controller 34 large water jet abrasive cutting machine operation edit all waterjets follow the same principle of using high pressure water focused into a beam by a nozzle most machines accomplish this by first running the water through a high pressure pump there are two types of pumps used to create this high pressure an intensifier pump and a direct drive or crankshaft pump a direct drive pump works much like a car engine forcing water through high pressure tubing using plungers attached to a crankshaft an intensifier pump creates pressure by using hydraulic oil to move a piston forcing the water through a tiny hole 35 36 the water then travels along the high pressure tubing to the nozzle of the waterjet in the nozzle the water is focused into a thin beam by a jewel orifice by reducing the diameter of the waterjet the velocity of the resultant jet is increased significantly this beam of water is ejected from the nozzle cutting through the material by spraying it with the jet of speed in the order of mach 3 around 2 500 ft s 760 m s 37 the process is the same for abrasive waterjets until the water reaches the cutting head here abrasives such as garnet and aluminium oxide are fed into a mixing chamber via an abrasive inlet the abrasive mixes with the water in the mixing chamber and is then forced out through a focussing tube at high pressure 38 39 benefits edit an important benefit of the water jet is the ability to cut material without interfering with its inherent structure as there is no heat affected zone haz minimizing the effects of heat allows metals to be cut without warping affecting tempers or changing intrinsic properties 40 sharp corners bevels pierce holes and shapes with minimal inner radii are all possible 41 water jet cutters are also capable of producing intricate cuts in material with specialized software and 3 d machining heads complex shapes can be produced 42 the kerf or width of the cut can be adjusted by swapping parts in the nozzle as well as changing the type and size of the abrasive typical abrasive cuts have a kerf in the range of 0 04 to 0 05 in 1 0 1 3 mm but can be as narrow as 0 02 inches 0 51 mm non abrasive cuts are normally 0 007 to 0 013 in 0 18 0 33 mm but can be as small as 0 003 inches 0 076 mm which is approximately that of a human hair these small jets can permit small details in a wide range of applications water jets are capable of attaining accuracy down to 0 005 inches 0 13 mm and repeatability down to 0 001 inches 0 025 mm 42 due to its relatively narrow kerf water jet cutting can reduce the amount of scrap material produced by allowing uncut parts to be nested more closely together than traditional cutting methods water jets use approximately 0 5 to 1 us gal 1 9 3 8 l per minute depending on the cutting head s orifice size and the water can be recycled using a closed loop system waste water usually is clean enough to filter and dispose of down a drain the garnet abrasive is a non toxic material that can be mostly recycled for repeated use otherwise it can usually be disposed of in a landfill water jets also produce fewer airborne dust particles smoke fumes and contaminants 42 reducing operator exposure to hazardous materials 43 meatcutting using waterjet technology eliminates the risk of cross contamination since the contact medium is discarded citation needed versatility edit a water jet cutting a metal tool because the nature of the cutting stream can be easily modified the water jet can be used in nearly every industry there are many different materials that the water jet can cut some of them have unique characteristics that require special attention when cutting materials commonly cut with a water jet include textiles rubber foam plastics leather composites stone tile glass metals food paper and much more 44 most ceramics can also be cut on an abrasive water jet as long as the material is softer than the abrasive being used between 7 5 and 8 5 on the mohs scale 45 examples of materials that cannot be cut with a water jet are tempered glass and diamonds 43 water jets are capable of cutting up to 6 in 150 mm of metals and 18 in 460 mm of most materials 46 though in specialized coal mining applications 47 water jets are capable of cutting up to 100 ft 30 m using a 1 in 25 mm nozzle 48 specially designed water jet cutters are commonly used to remove excess bitumen from road surfaces that have become the subject of binder flushing flushing is a natural occurrence caused during hot weather where the aggregate becomes level with the bituminous binder layer creating a hazardously smooth road surface during wet weather citation needed availability edit commercial water jet cutting systems are available from manufacturers all over the world in a range of sizes and with water pumps capable of a range of pressures typical water jet cutting machines have a working envelope as small as a few square feet or up to hundreds of square feet ultra high pressure water pumps are available from as low as 40 000 psi 280 mpa up to 100 000 psi 690 mpa 42 there has also been a growth in small desktop sized machines that operate at pressures under 10kpsi process edit there are six main process characteristics of water jet cutting uses a high velocity stream of ultra high pressure water 30 000 90 000 psi 210 620 mpa which is produced by a high pressure pump with possible abrasive particles suspended in the stream is used for machining a large array of materials including heat sensitive delicate or very hard materials produces no heat damage to the workpiece surface or edges nozzles are typically made of tungsten carbide 49 produces a taper of less than 1 on most cuts which can be reduced or eliminated entirely by slowing down the cut process or tilting the jet 50 distance of the nozzle from the workpiece affects the size of the kerf and the removal rate of material typical distance is 125 in 3 2 mm temperature is not much of a factor because the water used also acts as a coolant edge quality edit edge quality for water jet cut parts is defined with the quality numbers q1 through q5 lower numbers indicate rougher edge finish higher numbers are smoother for thin materials the difference in cutting speed for q1 could be as much as 3 times faster than the speed for q5 for thicker materials q1 could be 6 times faster than q5 for example 4 inches 100 mm thick aluminium q5 would be 0 72 in min 18 mm min and q1 would be 4 2 in min 110 mm min 5 8 times faster 51 multi axis cutting edit main article multiaxis machining this section needs more citations please help improve this section by adding citations to reliable sources unsourced material may be challenged and removed may 2023 learn how and when to remove this message in 1987 ingersoll rand waterjet systems offered a 5 axis pure water waterjet cutting system called the robotic waterjet system the system was an overhead gantry design similar in overall size to the hs 1000 with recent advances when in control and motion technology 5 axis water jet cutting abrasive and pure has become a reality where the normal axes on a water jet are named y back forth x left right and z up down a 5 axis system will typically add an a axis angle from perpendicular and c axis rotation around the z axis depending on the cutting head the maximum cutting angle for the a axis can be anywhere from 55 60 or in some cases even 90 degrees from vertical as such 5 axis cutting opens up a wide range of applications that can be machined on a water jet cutting machine a 5 axis cutting head can be used to cut 4 axis parts where the bottom surface geometries are shifted a certain amount to produce the appropriate angle and the z axis remains at one height this can be useful for applications like weld preparation where a bevel angle needs to be cut on all sides of a part that will later be welded or for taper compensation purposes where the kerf angle is transferred to the waste material thus eliminating the taper commonly found on water jet cut parts a 5 axis head can cut parts where the z axis is also moving along with all the other axes this full 5 axis cutting could be used for cutting contours on various surfaces of formed parts because of the angles that can be cut part programs may need to have additional cuts to free the part from the sheet attempting to slide a complex part at a severe angle from a plate can be difficult without appropriate relief cuts see also edit cryojet laser cutting plasma cutting electrical discharge machining digital modeling and fabrication references edit about waterjets archived from the original on 26 february 2010 retrieved 13 february 2010 guidorzi elia 3 february 2022 waterjet cutting history origins of the waterjet cutter techniwaterjet retrieved 17 february 2022 fourness charles a et al paper metering cutting and reeling filed 22 may 1933 and issued 2 july 1935 johnson carl olof method for cutting up plastic and semi plastic masses filed 13 march 1956 and issued 14 april 1959 schwacha billie g liquid cutting of hard metals filed 13 october 1958 and issued 23 may 1961 jenkins dennis r tony r landis valkyrie north american s mach 3 superbomber specialty press 2004 p 108 rice phillip k process for cutting and working solid materials filed 26 october 1962 and issued 19 october 1965 leach s j and g l walker the application of high speed liquid jets to cutting philosophical transactions of the royal society of london series a mathematical and physical sciences vol 260 no 1110 28 july 1966 pp 295 310 franz norman c high velocity liquid jet filed 31 may 1968 and issued 18 august 1970 chadwick ray f chadwick michael c kurko and joseph a corriveau nozzle for producing fluid cutting jet filed 1 march 1971 and issu...