Basic knowledge of waterjet abrasive

Abrasive has a significant effect on the performance of high-pressure water jets, especially in the abrasive water jet cutting, the choice of abrasive directly affects the cutting speed and the cutting surface quality. Many types of abrasives theoretically. According to sources can be divided into natural abrasive and artificial abrasive. Natural abrasive is made by minerals in nature crushing and screening, it is usually easier to impurities, but the cost is cheap; the second is artificial abrasive smelting by chemical methods, high purity, good performance, but the manufacturing process is complicated and expensive.

Garnet's chemical name: aluminum (calcium) silicate, to zhongtiao mountains garnet ore as raw materials, with the modern craft sticks refined, products high self-sharpening, grinding efficiency, sand consumption is low, wear parts good finish. The abrasive shell-shaped fracture, moderate hardness, good toughness, sharp corners, can be in continuous grinding new edges and side edges formed in the classification, make it better than other abrasive grinding, which has high hardness, specific gravity, chemical properties stable and unique self-sharpening of advantages, later also widely used in water jet cutting, therefore, also known as water jet sand. Natural almandine garnet because of its unique physical characteristics, high hardness, moderate cutting ability, no free silicon to become the best and most economical high-pressure water jet cutting medium.

According to the research, it is indicated that the water jet cutting any material has an optimum abrasive particle size, that is the same jet pressure and flow, can get the maximum cutting depth at a certain size, and increase or decrease the size, cutting depth are reduced accordingly. And for different hardness of the abrasive, for cutting different materials, the effect of different. For brittle materials, plastic materials and soft materials, the requirements of the abrasive are also different. For the same kind of abrasive, the same kind of cutting material, different water pressure and sand flow, the effect of cutting is also very great. Cutting process, water pressure and sand flow also has an optimal state.

Currently, the water jet grade garnet sand mainly 60 mesh, 80 mesh and 120 mesh, the basic is natural gravel screening process. The main origin of India, China, the United States, Australia and other regions, the domestic mainly concentrated in Hebei Xingtai and Lianyungang East China Sea area. In the price, the higher price of imported garnet sand, and lower price of domestic sand, quality is also very good.

Source: http://www.waterjetnozzles.com Abrasive Waterjet Nozzles.

How to choose abrasive for waterjet cutting machine

Although waterjet equipment is the use of ultra-high pressure technology to ordinary tap water pressure to the high pressure (usually 250--400Mpa), then ejected through a very fine diameter gem orifice, forming speed of about 800-1000m/s high-speed jet, commonly known as water arrows. For cutting material, but with pure water energy, can cut soft base materials. Waterjet cutting ability ia related to the abrasive, and if you want to cut hard materials, you need to add the right amount of abrasive in water. Specifically how to choose abrasive and Here simple explain. Let's look at how to select waterjet cutting abrasive.

To be able to cut hard materials, it is necessary to add abrasive in the high-pressure water. The abrasive effect is used to improve the cutting performance. Enlarge particles, there are a lot of edges on it, it is these edges like a sharp blade driven by high-pressure water continuously toward the workpiece form a strong cutting force. The sand used was blunt their edges, and thus loses its cutting ability, so for used abrasive no longer recycling.

In order to make the cutting section of the workpiece relatively smooth, uniform, requires the abrasive flow is good and can be continuous, uniform supply, so the sand particle size have more stringent requirements, too large particles have poor mobility, and easy to plug the pipe; too small particles, cutting ability reduced. When the abrasive contains larger size debris will lead to poor abrasive flow, thereby reducing the cutting ability; when the abrasive contains tiny particles of dust, the dust will be assembled and attached to the pipe wall, especially pipeline bend, thus impeding the flow of abrasive, cutting capacity will be reduced. For these reasons, the abrasive used in the waterjet cutting shall be strictly filtration screening, screening at least twice, once to remove large particles and debris, once to remove very small particles of debris. In the use of water jet cutting machine according to the needs to choose different abrasives, which will help improve cutting efficiency.

The quality of the waterjet sand is critical

Waterjet can cut very hard things, which the role of waterjet sand contributed, its quality plays a key role.

Waterjet sand is used for water jet cutting, a high-pressure water jet abrasive, its quality and cutting speed, cutting effects are inseparable, so learn how to identify good or bad quality waterjet sand is critical. If the waterjet sand quality is poor, due to the rough process, impurities or large particles exist in the products. If long-term use will not only damage the cutting machine's nozzle, but also reduce the cutting precision, and often replace the damaged nozzle is an additional cost, the cost of production will increase.

To distinguish the quality of waterjet sand, first hand rub can try to determine the hardness, and then stirred into the water, by observing the water dust and ineffective fine-grained content to judge the merits of products.

In fact, if you can try it, you will all understand. Because the good quality water sand will not cause plug phenomena in the waterjet cutting process; and cutting speed displayed on a cutting machine is relatively fast; additional cutting effect is more ideal, not only good accuracy but also cutting surface straight and smooth.

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