پاورپوینت کامل Water jet Cutting 57 اسلاید در PowerPoint

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پاورپوینت کامل Water jet Cutting 57 اسلاید در PowerPoint

اسلاید ۴: Thickness and Kerf WJ can cut materials ranging from 10 stainless steel to 0.010 acrylics. Stacking of very thin materials to increase productivity is possible. Kerf ranges from 0.020 to 0.050.

اسلاید ۵: Taper and Edge Finish Taper and edge finish are directly related to cut speed. The greater the speed, the more taper and the coarser the edge finish. For a finer edge finish, use a finer abrasive.

اسلاید ۶: HistoryDr. Franz in 1950’s first studied UHP water cutting for forestry and wood cutting (pure WJ)1979 Dr. Mohamed Hashish added abrasive particles to increase cutting force and ability to cut hard materials including steel, glass and concrete (abrasive WJ)First commercial use was in automotive industry to cut glass in 1983Soon after, adopted by aerospace industry for cutting high-strength materials like Inconel, stainless steel and titanium as well as composites like carbon fiber

اسلاید ۷: Types of Water jet cutting1. Pure Waterjet cutting: Waterjet cutting uses only a pressurized stream of water to cut through material.2. Abrasive Waterjets cutting:An abrasive waterjet entrainment system mixes the abrasive with the waterjet in a mixing chamber just after the nozzle. In most systems being built today, a venturi effect is utilized to pull the abrasive into the waterjet. The abrasive pa rticles are accelerated into the stream and then with the stream out the orifice.

اسلاید ۸: Pure WJ CuttingPure cuts soft materials – corrugated cardboard, disposable diapers, tissue papers, automotive interiorsVery thin stream (0.004-0.010 dia)Extremely detailed geometryVery little material loss due to cuttingCan cut thick, soft, light materials like fiberglass insulation up to 24” thick or thin, fragile materialsVery low cutting forces and simple fixturingWater jet erodes work at kerf line into small particles

اسلاید ۹: Pure WJ Cutting cont.Water inlet pressure between 20k-60k psiForced through hole in jewel 0.007-0.020” diaSapphires, Rubies with 50-100 hour lifeDiamond with 800-2,000 hour life, but they are pricey

اسلاید ۱۰: Abrasive WJ CuttingUsed to cut much harder materialsWater is not used directly to cut material as in Pure, instead water is used to accelerate abrasive particles which do the cutting80-mesh garnet (sandpaper) is typically used though 50 and 120-mesh is also usedStandoff distance between mixing tube and workpart is typically 0.010-0.200 – important to keep to a minimum to keep a good surface finish

اسلاید ۱۱: Abrasive WJ Cutting cont.Evolution of mixing tube technologyStandard Tungsten Carbide lasts 4-6 hours (not used much anymore)Premium Composite Carbide lasts 100-150 hoursConsumables include water, abrasive, orifice and mixing tube

اسلاید ۱۲: Creation of the abrasive water jet stream

اسلاید ۱۳: ۱ – Water pressurized at 50,000 psi or greater enters the cutting head at relatively slow speed. 2 – The water is forced through an orifice that has a small diameter orifice, anywhere from 0.004 to 0.045 depending upon the application. These orifices are made of extremely hard material, such as diamond, sapphire or ruby. This step converts the water stream from a high pressure stream to a high velocity stream. At this point the water is moving in excess of 2200 miles per hour (3657 kilometers per hour).

اسلاید ۱۴: ۳ – The high velocity of the jet creates a Venturi effect, or vacuum, in the mixing chamber located immediately beneath the orifice. Abrasive, typically garnet is metered from a mini-hopper through a plastic tube down to the cutting head and is sucked into the water jet stream in the mixing chamber.4 – The abrasive is fully mixed in the water jet stream and is accelerated to approximately the speed of the water jet stream. This step does steal some energy from the water jet stream, slowing it down slightly.

اسلاید ۱۵: ۵ – The abrasive water jet stream exits the mixing tube with extreme speed and power. The abrasive erodes the material to be cut. The process is referred to as abrasive water jet cutting because it is the abrasive that is actually doing the cutting. The waters role is simply to give speed and power to the abrasive. In pure water jet cutting, used for soft materials like foam and food, the force of the water jet stream alone is enough to cut the material and abrasive is not required.

اسلاید ۱۶: Types of pumps Intensifier: Intensifier pumps use the concept of pressure intensification to generate the desired water pressure.If you apply pressure to one side of a cylinder and the other side of the cylinder is half area, the pressure on the other side will be doubled. Generally with intensifier pumps there is a 20 times difference between the large surface area (where the oil pressure is applied) and the small surface area (where the water pressure is generated).

اسلاید ۱۷:

اسلاید ۱۸: The pressurization process in intensifier pumps1. Oil is forced into the right half of the hydraulic cylinder.2. The piston-plunger assembly moves to the left. Oil is displaced out of the left half of the hydraulic cylinder and the water in the left high pressure cylinder is pressurized

اسلاید ۱۹: ۳. The plunger moves to the left4. Once pressure has begun to build, the high pressure water is forced out of the intensifier through the center of the check valve.5