High-pressure water jet cutting technology

Waterjet Features

In addition to water cutting, other cutting methods will be limited by material varieties, can not be any material for any curve of the one-time cutting process; cutting, high-speed flow of water jets will immediately take away the heat generated, and does not produce harmful substances, the material is no thermal effect that is, the cold cutting, cutting does not require secondary processing or easy to secondary processing, with safety, environmental protection features, faster, more efficient, to achieve the Any curve of the cutting process, convenient and flexible, wide range of uses; water cutting is the current applicability of better mature cutting process.

Waterjet Classification

In the case of Gaza: water cutting is divided into two types: sand-free cutting and Gaza cutting.

By equipment: divided into large water cutting and small water cutting.

These are classified as high and low pressure types, usually on the basis of a threshold, above which they are classified as high pressure, below which they are classified as low pressure, and above which they are classified as ultra-high pressure.

In terms of technical principle: it is divided into pre-mixing and post-mixing.

In terms of mechanical structure: divided into cantilever type and gantry type.

From the classification point of view of safety cutting: can be divided into safety cutting category and non-safety cutting category, the difference between the two is mainly reflected in the water pressure of this element above, the next to say is that the low-pressure water cutting can be used in special industries such as: hazardous chemical, petroleum, coal, hazardous materials handling and so on many aspects. After a large number of experiments, people found that when the water pressure exceeds a certain threshold, even if only pure water will lead to some sensitive chemicals to detonate the situation, and sandy water cutting because the water contains abrasive sand, the potential energy of the sand as well as the impact of collision with the object, the energy generated by the same will trigger the emergence of special chemicals unstable after a large number of experiments as well as demonstration, and ultimately arrived at its threshold About 237.6MPa]. After a lot of experiments and arguments, the threshold value is about 237.6MPa. Therefore, in the water cutting industry, for these water cutting, it is mainly used in the machining industry.

Products

Waterjet is a new technology and new products, it belongs to mechanical products, unlike electronic products that have a strong sense of technical mystery and sense of technology, so it has not been valued by the media, until 2011, the water jet expert Ji Xinguang creatively find another way to make the waterjet miniaturisation, safety, which allows the waterjet to change the situation can not be used in the field of danger. Because of its groundbreaking thinking and influence in the industry, CCTV's science and education programme made a report on it, with a 60-minute interview in 2011 and a detailed introduction to waterjet knowledge.2 Because the ratings became the top-rated domestic science and education programme in terms of ratings, CCTV rearranged the programme in 2012 and broadcast it many times in prime time. Ji Xinguang's Water as a Knife3 was featured in a 30-minute special report for CCTV's Life of Science and Technology programme at a later stage.

Cutting Comparison

Comparison with laser cutting

Laser cutting equipment investment is not small, mostly used for thin steel plate, part of the non-metallic material cutting, cutting speed, high precision, however, laser cutting will cause arc marks and thermal effects at the kerf, in addition to some materials such as aluminium, copper and other non-ferrous metals, alloys, laser cutting is not ideal, especially for the thicker metal plate cutting, cutting surface is not good, or even difficult to cut, people carry out research on the high-power laser generator, aimed at solving the problem of thick steel plate cutting, but the investment in equipment investment, maintenance and operation consumption and other cost investment is quite high. Aimed at solving the problem of thick steel cutting, equipment investment, maintenance and operation consumption and other cost investment is quite high. Water cutting, the investment scale is small, the operation cost is very low, can cut a wide range of materials, with high efficiency, and operation and maintenance are convenient.

Comparison with plasma cutting

Plasma cutting has obvious thermal effects, its accuracy is at a low level, the cut surface is not easy to carry out secondary processing again. Water cutting belongs to the category of cold cutting, there is no thermal deformation, the cutting surface quality performance is good degree, basically no need to go back to the implementation of the secondary processing plant, if there is such a need that is also very easy to go to the secondary processing.

water jet machine

Wire EDM is more accurate than waterjet cutting in metal processing, but it is extremely slow, and sometimes it is necessary to use other methods for piercing and threading before cutting, and the size of the cut is very limited. Waterjet cutting, on the other hand, is capable of punching and cutting any material, with fast cutting speeds and a wide range of processing sizes to choose from.