A waterjet is a machine that uses high-pressure water to cut. The technology first emerged in the United States. It was used in the aerospace and military industries. After continuous technical improvements, waterjet cutting has greatly improved cutting speed and cutting thickness by mixing high-pressure water with garnet sand, diamond sand, and other abrasives to aid the cutting process.
Waterjets are widely used for ceramics, stone, glass, metal, composite materials, and in many other industries. Some technologically advanced companies have perfected 3-axis and 4-axis waterjets, and 5-axis waterjets are also maturing. Waterjet cutting has a number of advantages and disadvantages compared to other cutting methods.
Advantages of Waterjet Machining
- Unlike other machining methods, because the cutting is done with water and abrasive, no high heat is generated during machining. This effect is very ideal for heat-sensitive materials. For example, titanium. There is a heat-affected zone near the cutting area with other methods, but the heat generated during cutting is immediately carried away by the high-speed waterjet flow, so it produces no harmful substances and has no thermal effect on the material.
- There’s no restriction on cutting direction. Various cutting shapes can be completed.
- This process is also environmentally friendly. Waterjet cutting produces no harmful gases or liquids.
- The cut edges produced using this process are clean because they involve no heat.
- This process doesn’t reduce the material’s weldability.
- It can cut complex shapes.
- It can cut heterogeneous materials.
- The same machine can complete both drilling and cutting functions in one pass, which can reduce machining time and cutting cost. There’s no need to change the cutting machine unit; a single nozzle can process different types of materials and shapes, saving both cost and time.
Cutting Pressure
Industrial waterjet systems operate at ultra-high pressures of 3000-6000 bar, depending on the material.
Abrasive Additive
Abrasive particles such as garnet are typically added to the water to cut hard materials like metal or stone.
Not Heat-Affected
Since waterjet cutting is a completely cold process, no heat-related deformation or hardness change occurs in the material.
Disadvantages of Waterjet Machining
- A certain amount of water vapor can form in the surrounding area, which could damage sensitive equipment.
- Cutting time is longer compared to traditional cutting systems. In some applications, compared to laser cutting, plasma arc cutting, wire EDM, and other methods, it has drawbacks such as low feed rate and weaker machining precision.
- Cutting very thick materials with this process won’t be easy. High-strength composite materials and high-hardness materials such as hard rock can’t be cut with pure waterjet, while abrasive waterjet leads to problems such as nozzle wear and high cutting cost.
- Initial cost is high. The equipment cost of a high-pressure waterjet is higher than that of other cutting methods.
- In the cutting process, there are many parameters that affect cutting quality, and the conditions are complex.
- The nozzle wears out quickly.
- It’s not ideal for machining soft materials and elastic materials.
Related Questions
Since cutting is done with water and abrasive, no high heat is generated during the process. This allows materials that are easily affected by heat, such as titanium, to be cut without losing their shape or properties.
Pure water alone can cut soft materials, but it’s not sufficient for hard materials like metal. When abrasives such as garnet sand are added, cutting power and speed increase significantly.
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