What should be paid attention to when cutting with high-pressure water jet?

Because waterjet cutting is widely used and easy to operate, manufacturers realize that in fact, the cutting capacity of water jet is unlimited. Processing workshops of all sizes realize that the use of ultra-high pressure water jet brings higher efficiency and productivity. Water jet has become a machine tool equipment in many processing workshops. Because the sanding water knife technology was first invented by ferro in the 1980s, the technology has rapidly entered continuous research and development.


What makes water jet technology so popular? The water jet requires a few auxiliary operations. It can produce mesh parts without heating area, thermal deformation or mechanical deformation caused by other cutting methods. It can process narrow gaps and make better use of raw materials, because multiple parts can be tightly nested together. In fact, the water jet can cut any material and keep the incision smooth and flat. Together, these advantages have resulted in significant cost savings for each part in industry, which is traditionally defined by hourly cost.


Water jet cutting offers many advantages to various manufacturers. Key points include:

1.Unparalleled versatility

The water jet can be used for many purposes. No matter what shape, size or material, easy-to-use software can provide valuable multiple uses for your business.


2.Capacity expansion

No matter what business you are engaged in - automobile, aviation, stone and tile, tools and molds, manufacturing or processing workshop, you can cut up to 8 inches of metal, stone, plastic, composite, glass, ceramic or rubber without regional heating, and the edge quality is very good.


3.Improve the existing technology

The current trend is to add water knives to the equipment processing workshop as a supplement to other cutting technologies, such as EDM, laser, milling machine and plasma processing. While each workshop has its own requirements for cutting projects, most people find that the water knife is very helpful to improve its productivity and profit.

When forced through small openings to raise water pressure to 60000 PSI, it cuts all kinds of soft materials, such as food, paper, baby diapers, rubber and foam. When a small amount of abrasive, such as pomegranate sand, is sandwiched into the water jet, it can cut any hard material, such as steel, compound, stone and glass.

Through observation, it is found that the change of any parameter in the process of water jet cutting will more or less affect the stability of the balance gap, and even for the same batch of processed workpieces, the balance gap will affect the dimensional consistency between them, that is, the cutting accuracy of water jet cutting.


Practice has proved that under the premise of determining the material structure, the surface roughness of water jet machining will actually be affected by many factors. Due to the small gap and high current density processing, all kinds of metallographic structures can be dissolved evenly, so a small surface roughness value can be obtained.


Secondly, proper electrolyte flow rate and uniform flow field design can also promote water jet machining to obtain smaller surface roughness. At the same time, the temperature of electrolyte should be controlled in an appropriate range. Practice has proved that when the temperature is low, the passivation is serious, which makes the anode surface dissolve unevenly and increases the surface roughness value.


In addition, the electrolyte suitable for the workpiece material should be selected as far as possible, so as to reduce the surface roughness value. For example, when machining titanium alloy with water jet, using NaCl electrolyte and adding NaF, NaBr and other additives can prevent orange peel like bright spots on the surface and reduce the surface roughness of titanium alloy.


In addition, a large number of experiments show that the impact times of water to a certain point on the cutting depth is similar to the impact time of water jet material on the cutting depth. In the internal cutting of a cutting groove, the first few cuts play a major role. At this time, the number of cuts has a significant impact on the cutting depth.


Compared with other cutting methods, high-pressure water jet cutting has more advantages. The more remarkable ones are high cutting precision, simple operation, low cutting cost, wide cutting range, etc. it has so many advantages because of the effect produced by the cooperation of various high-pressure water jet accessories.


High pressure water jet cutting is good, but it also needs to be taken care of and standardized in use. First, pay attention to the thickness of the cutting material. When cutting, select the appropriate cutting head according to the thickness of the material to be cut. When the material thickness is less than 2.5, use medium or large cutting head, and the cutting output is not high. Therefore, more cutting heads should be prepared and reasonably selected according to the material.


In the process of high-pressure water jet cutting, if there is a gap between the material and the material, the rapid water jet from the water jet nozzle will diverge between the air gaps, resulting in the rough surface of the cutting material, which will affect the cutting effect. Therefore, when cutting, keep the materials flat and stacked together.


When cutting some special materials with high-pressure water jet, you can choose underwater cutting operation, which can reduce the atomization on the material surface during water jet cutting. Due to the reduced visibility during underwater cutting, it can be used with the electronic monitor of high-pressure water knife accessories, which can improve the cutting accuracy.


If the cutting material is glass, stone and other composite materials, it is necessary to change the cutting rate by controlling the increase or decrease of water pressure. Otherwise, greater pressure may lead to material damage. In addition, it should be noted that the water used by the high-pressure water jet needs to be filtered first to filter out the impurities in the water, so as to prevent the impurities from wearing the nozzle, affecting the cutting effect and reducing the service life.