11 Water Jet Cutting Skills You Should Know

1. Cutting thick materials

When cutting materials with thickness less than 2.5, the output of medium (50HP) or large (60 to 80HP) cutting heads is not high.

If necessary, a small parameter combination (25HP) can be used and multi head cutting can be considered to improve production.

2. Air gap is encountered during cutting

Avoid cutting air gap greater than 0.5mm.

The nozzle tends to diverge in the air gap, so the surface will be rough when cutting low layers.

When stacking and cutting, keep the sheets neatly stacked together.

3. Smaller abrasive mesh

A smaller number of abrasive meshes (120 mesh or less) will reduce the speed slightly, but can produce a smoother surface (compared with 80 or 50 mesh).

4. Production cost is calculated per inch

Production costs are calculated per inch rather than per hour.

The cost per hour of running a sanding water knife is not very important.

Most importantly, how many parts can you produce in a given time period.

Some users mistakenly believe that the operation cost can be minimized by reducing the injection flow rate.

Although Abrasives account for two-thirds of the operating cost of sanding water knives, you must produce parts quickly to offset the consumption of recurrent expenses (labor, facilities, rental expenses).

Use all horsepower and the highest sanding jet rate to speed up the cutting speed as much as possible.

5. Increase or decrease the water pressure through the controller

If you regularly cut composite materials, glass and stone, ensure that the system has the ability to increase or decrease the water pressure through the controller.

At the same time, you should also study vacuum assisted technology or other technologies to improve the success rate of puncture fragile or laminated materials.

6. Control system specially designed for process

The control system specially designed for the process is usually more efficient and easier to use than the general multi process control.

7. Automatic loading and unloading

Most machines do not use automatic up and down technology, such as shuttles.

Only when material handling accounts for a significant proportion of the production cost of parts can automatic landing be considered.

90% of the sanding water knives are loaded and unloaded manually, or with the help of simple crown block, boom crane or forklift.

8. Ordinary tap water

The water knife system uses ordinary tap water. 90% of users of pure water and sand water knives only require that the water be softened before entering the supercharger through the pump inlet filter.

Reverse osmosis (RO) and deionization technologies are used to purify water into “unsaturated” water.

This water easily absorbs ions from the surrounding environment, such as metals in pumps and high-pressure lead pipes.

Reverse osmosis and deionization technology can greatly prolong the service life of the nozzle, but also cause expensive damage to the supercharger and high-pressure pipe.

Although the nozzle is cheap, the loss of high-pressure cylinder, check valve and end cover will be much greater than the benefit of prolonging the service life of the nozzle.

9. Underwater cutting

Underwater cutting can reduce the surface or upper edge atomization caused by sanding water knife cutting process.

Underwater cutting can greatly reduce the noise during cutting and make the working environment cleaner and orderly.

The only disadvantage is that the operator cannot see the spray cutting clearly during the cutting process.

If the operator opposes underwater cutting, electronic performance monitor can be considered.

These monitors will detect the peak deviation of cutting performance and stop the machine before parts are damaged.

10. Different abrasive mesh

If you plan to use different mesh sizes of abrasives for different jobs, consider adding a small (100 pounds) or large (500 to 2000 pounds) sand bucket.

If the sand bucket is not prepared for the number of meshes used regularly, it may lead to shutdown and make your production very cumbersome.

11. Reserved reclaiming port

The reserved reclaiming opening can prove the effectiveness and convenience of cutting materials with a cutting thickness of less than 8mm.

Although the reclaim opening usually requires you to carry out secondary treatment to grind off these extraction points, the use of reserved reclaim opening can make the treatment of materials faster – slicing and cutting parts are still integrated for easy unloading.

The harder the material is, the smaller the reserved reclaiming opening should be.

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