Diamond drills are tools with extraordinary performance, capable of working in the toughest building materials. However, their effectiveness is inseparable from one key factor: temperature. During drilling, huge amounts of heat are generated, which can irreparably damage the diamond segment and shorten tool life. Therefore appropriatecooling of diamond drillsis not an option, but an absolute necessity. In this article, we will explain why temperature control is so important, compare the most popular cooling methods and give a hint on how to choose a technique for a particular task to make work efficient, safe and economical.

Why is cooling diamond drills important?

The primary cooling task is to drain the excess heat that arises from friction of the diamond segment by the machined material. Diamond drills consist of grains of synthetic diamond embedded in metal binders. Too high temperature, exceeding several hundred degrees Celsius, leads to degradation of both components. Firstly, diamond graphite can occur, which means the loss of their hardness and cutting properties. Second, the metal matrix that holds the diamonds softens, causing them to fall out prematurely. The result is the phenomenon of "glassing" drill, which stops cutting and begins to slide on the surface. Proper cooling prevents these problems, and in addition in the case of wet methods, effectively eliminates dust, which significantly improves safety and comfort of operation.

Wet drilling vs. dry drilling: comparison of methods

The choice of cooling method depends on the type of drill, machined material and operating conditions. Two basic techniques are wet and dry drilling, and each has its own specific applications, advantages and disadvantages. The decision to choose one is fundamental to the efficiency and viability of the tool.

Wet technology is considered the most effective and recommended method.Wet drilling with diamond drillconsists of continuously supplying water or special cooling directly into the cutting zone. The liquid not only cools the segments, but also flushes the material and dust out of the hole, reducing friction and preventing the tool from wedged. In turndry drilling with a diamond drillis used in situations where the use of water is impossible or inappropriate. Drills designed for dry operation have a special design, e.g. laser welded segments and a body with holes to facilitate heat removal. Some are filled with wax, which melts under the influence of temperature, ensuring cooling and lubrication.

Comparison of key characteristics of both methods:

• Productivity:Wet drilling is much faster and allows for continuous work, even in very hard materials like reinforced concrete. Dry work requires air cooling breaks.
• Tool life:Water cooling dramatically prolongs the life of the drill compared to dry work.
• Universality:The wet method is effective in every material. The dry method is limited to less demanding applications and shorter holes.
• Purity of work:Wet work eliminates dust, which is crucial for operator health and clean environment. Dry work generates large amounts of dust, requiring suction systems.
• Requirements:Wet technology requires access to water and generates sludge that needs to be removed. Dry technology is simpler logistically, but requires more attention from the operator.

What are the best cooling fluids?

Although in most cases ordinary, clean water is sufficient and the most popular coolant, specialist preparations are also available on the market. The choice of appropriate means can further increase the efficiency of work and protect the tool and machine. Suitablediamond drill cooling liquidmay offer advantages beyond the direct discharge of heat.

Water or special cooling concentrate?

Specialist cooling fluids are most often water dilution concentrates that form emulsion or solution. Their main advantage is to improve lubricant properties, which reduces friction between the drill and the material. As a result, the drilling process is smoother and the drill or drill load is smaller. In addition, many of these fluids contain corrosion inhibitors that protect both the drill and metal parts of the machine from rusting. The use of professional coolers is especially recommended during intensive operation, drilling of large diameter holes and for expensive drills and machines where the cost of protection is negligible compared to potential losses due to failure or rapid wear.

Cooling technique according to material

The efficiency of cooling depends not only on the chosen method, but also on its correct application, adapted to the specificity of the workpiece. Different materials generate different amounts of heat and dust, which requires an individual approach.

Gres and hard ceramic tiles:It's very hard and fragile. Drilling in them generates high temperature on a small surface, which threatens to break the plate. Wet drilling is definitely recommended here. Special slides with suction cup and water tank can be used, which provide a constant supply of coolant exactly where drilling takes place. Circular drilling helps to better distribute water and remove waste.

Concrete and reinforced concrete:They are characterized by large abrasiveness and a heterogeneous structure (presence of reinforcement). Drilling in these materials, especially crowns with larger diameters, is practically possible only in wet. Continuous water flow is crucial for cooling segments and leaching large amounts of sludge. The dry drilling attempt in the reinforced concrete leads to the rapid destruction of the drill.

Natural stone (granite, marble):Like ggres, it is hard and sensitive to thermal shock. It requires constant and abundant cooling with water to avoid microfracture and discoloration of material caused by overheating.

Bricks, hollows, soft materials:In the case of short holes in less demanding materials, dry drilling with suitable drills is permitted. However, it is important to remember to make regular breaks every several seconds, withdrawing the drill from the hole so that it can cool off in the air.

Effect of cooling on drill life

The direct link between cooling and tool durability is undisputed. Any overheating of the diamond segment causes irreversible losses in its cutting potential. Proper and consistent cooling is the most important maintenance operation an operator can perform while working with a diamond drill. The investment in a suitable cooling system, whether simple sprinkler or integrated system in the drill, is repeatedly turned into a longer life of tools.

Maintaining optimal operating temperature protects diamonds from burning and metal binder from loss of hardness. As a result, the drill retains its aggressiveness and cutting speed for a much longer time. This means less downtime, lower costs associated with buying new tools and ultimately – higher profitability of the work done. Remember, even the most expensive diamond drill, used without proper cooling, can be destroyed in just a few dozen seconds.