Waterjet cutting

2017.06.21

There are a lot of talking what are the differences, advantages and disadvantages of different cutting technologies. Unfortunately, even sales managers of manufacturers companies do not have all the information and try to offer for the potential customer the machine he doesn’t need.

Waterjet is the technology to cut the materials with the water flow (for very soft materials) or water with the sand (which is normally common for the most applications). For waterjet possibilities there are no any differences with the materials – it could cut mostly all from plastic and resin till the hard metals.

Normally the use of waterjet cutting machine for classic sheet metal fabrication is very low. There are some applications and industries where you can’t work without the waterjet, for example to cut granite for indoor use. What are the main advantages? The first and important for some industries like aerospace that waterjet cutting doesn’t affect any material heating and change of the structure even for cutting edge. So this is the main difference between laser and plasma cutting. Second is the big thickness of materials with the clean and precise cutting edge. Imagine what does it mean to cut 50-100 mm thickness with the plasma and how big will be the burrs after melted metal. Moreover because of the technology there are no limits for metals, like, for example the situation with CO2 laser cutting when the degree of reflection for non-ferrous alloys is very high.

Not the main but important – with waterjet you can cut several sheets to put as the package. For sure as for the thickness of cutting you should consult with the manufacturer but sometimes it is the possibility to make the speed boost for the production. Moreover lots of waterjet cutting machines offer the swiveled cutting which means the cutting of tilted head for desired degrees.

Disadvantages? The main one is the speed because the waterjet cutting is incredibly slow. For this reason waterjet can’t be the competitive solution for thin materials and standard sheet metal fabrication workshop. If you do not have any special applications there are no reasons to study waterjet technology because it is for other things. Moreover you should consider about the maintenance because, for example, waterjet is very sensitive for water quality so you should be prepared for special installations to use it.

Offline software and tools

2017.06.20

Why you need any additional software, pay money for it if you have the same in your CNC control? The answer is simple enough – besides operator there could be other people who need to work with bending technology. All manufacturers of CNC machines normally have the software as offline package to install at different place for preparation of programs for the machine. It could be necessary first of all for engineers to develop and project the part and to leave to the operator the standard work to control the machine. For small companies engineer and the operator could be the same person but if there is the engineers department usually there are different people with different work tasks. Moreover on the market there are independent software manufacturers to offer independent software packages for the most common machinery. For example, for press brake market there are around 5 manufacturers to sell the software with nearly the same possibilities.

At first as we said the software is great to offer the programs preparation outside of the machine. At second software can increase the possibilities of the machine as well, for example to make 3D simulation of press brake bending if it is CNC control only with 2D visualization possibilities. Or to perform auto-nesting (optimization of parts position on the sheet metal to reduce the percentage of waste part) for CNC cutting machine – laser, plasma or waterjet. At third somebody could require some separate functions, for example to go to the tool library to verify the availability of necessary tooling for the new order.

It is also clear that outside of operator and engineer there are other staff to check the production flow, machine status control and availability of production for the order. Even sales manager should know how to calculate, for example tonnage for the press brake in production to understand if it will be enough to perform the order. Sure thing in future with the grow of Industry 4.0 of these questions will be fully integrated – customer will get the information about the machine, if the tooling is necessary the order will automatically go to the purchase department and software will allow to run immediate production of possible and the drawing doesn’t need the intervention of the engineer. But today all the actions are separated and to realize them all in the most convenient way – is the task for software to present all necessary functions for necessary departments. Today mostly offline software is the engineering software to make the program but it is sure that tomorrow the winner of the competition will be the manufacturer who will implement inside more and more necessary management and production flow functionality.