Concrete drilling diamond crowns

Diamond or winning crown drill – the only way out for masters, which decades previously needed a massive burden of the same diameter, sometimes weighing not one tet kilograms. The drilling crown-boring cross section of the working part of 10 cm made drilling in a not quite comfortable position or at high height significantly faster, efficient.

Features and scope of application

Diamond crowning drill is used in places where the use of standard high-speed steel or even a winned alloy is significantly complicated by the presence of clay brick, high-strength reinforced concrete for reinforced foundations and inter-storey floors of buildings. It helps the wizard in the case when a reinforcement grid is present in concrete products with rods of more centimeter thickness.

Crown – a composite tool that includes a hollow cylinder with a cut end, on the edge of which a layer of diamond or to win.

In the center there is a setting drill (drill on concrete), which is removable. Such a bur (short length) is easy to purchase in any construction store. But there are crowns with a beamy brown, the breakdown of which will complicate the cutting of the hole in a strictly specified place.

The main design is a piece of pipe and the base of the central bora – are made of high-strength tool steel. Wins and / or diamond is only on cutting (penetrating) edges. The car from the whole piece of victorious or diamond would cost ten times more expensive than existing analogues.

Concrete reduced strength from which the non-accumulative nonsense partitions are made between the rooms of the same apartment, can be drilled and a winning alloy. Natural stone (granite, basalt) in unstressed mode still crushes and cuts precisely diamond drill, the same applies to an impaired glass. Any brick is processed in shock mode by the winning crown – in this case, the purchase of diamond (the same in diameter) is unnecessarily the road.

Exception of all these rules – tempered glass, which though the diamond tip is crushed, but at the slightest attempt to process the material immediately crumbles into a small crumbling with dull edges.

Scope of the use of winning and diamond crowns – gasket of electrical and electronic communications, water supply lines, heating, hot water supply and sewage.

A typical example is any apartment building: without a diamond crown of the sewage pipe (diameter up to 15 cm) on all floors, where the toilets are located over the other, do not hold.

Scope of crowns – drills and perforators of any power, manual drilling mechanisms. Holes, in addition to through (for laying engineering communications), also be worked out in a non-cut version: recesses for mortise outlets, switches and fuse machines, counters, embedded sensors and other. Overhead (non-mortise) electrical appliances of crown drilling in the wall will not require.

The drilling of foam and gas blocks, wooden walls, composite, plastic partitions and overlaps is performed by simple rapid steel crowns. They do not need a diamond spraying nor a winning tip.

Types of crowns for drilling

Crowns for drilling differ in the scatter of diameter values. It defines their specific purpose in each application area.

  • 14-28 mm – differ in step in 2 mm. It is 14, 16, 18, 20, 22, 24, 26 and 28 mm. Rare exceptions include values, for example, 25 mm. Diamond crowns with a small value – up to 28 mm – used for drilling holes for chemical anchors. The latter are used to build the overpass carrying supports of large-sized machine tools and other heavy structures. Chemical anchor attachments suggest the presence of a drilling crown, more at least 4 mm than the heel itself. In case of non-compliance with this requirement, the chemical anchor will not provide an appropriate margin of safety.

  • 32-182 mm. The step is 1 cm, but the number ends with a number 2. Exception – sizes 36, 47, 57, 67, 77 and 127 mm. The size (diameter) of the working part of this drill has a “round” value, for example, 30, 40, 50 mm. In this case, “extra” 2 mm – one on each side – extension from the side of 1 mm. Without a single-dimmeter spraying, which is a diamond layer, the crown would not perform its functions. For example, 110 mm on fact are 112-y – taking into account the high-strength cutting layer.

  • Crowns of increased diameter – 20-100 cm – do not possess a single pattern in the scattering of values. The diameter step can be equal to 25, and 30 mm. Typical dimensions – 200, 225, 250, 270, 300 millimeters. Larger – 500, 600, 700 mm and further. In special cases, individual sizes are applied, for example, 690 mm.

    In addition to diamonds, it is used by carbide (entirely) crowns. This allows you to translate the perforator to the rotary bipper mode, which makes it possible to split the layer of concrete, under which it lies a longer layer with reinforcement. Nozzle of such a crown at elevated loads quickly (prematurely) wear out.

    Crowns often failing at the most inopportune moment require the most durable alloys in their composition.

    For example, The work part has a gentle look, and the SDS shank is suitable for most of the models of domestic and Japanese perforators used in everyday life. Such a solution – an option to quickly break through the concrete partition in the apartment for a small diameter, but these products are not distinguished by an increased service resource. Due to the high impact effect, the quality of drilling significantly suffers.

    Drilling methods

    Depending on the characteristics of the wall or overlap, a dry or wet cutting of the material is used from which the partition is made. There are rules and recommendations that give the opportunity to get a long time from the tool used by the time (and the total rolling depth of the working holes) of the work resource.


    Drilling (punching) “dry” applies in places where it is impossible to organize a temporary channel of water supply. The crown should be located very precisely at the site of drilling: the slightest offset during her work will lead to the tool. Shank and clamping cartridge must be lubricated. Lubrication will exclude excessive shock friction leading to the wear of the shank.

    Dry drilling is used on objects, indoors, where equipment is extremely sensitive to moisture, and it cannot be turned off and move it, as the production process will interrupt.


    The essence of this method is as follows: a constant flow of water is supplied to the working area to cool the crown drill heating from friction. Water pumps under pressure in one or more terrestrial atmosphere – but so that the splashes from the excessive overestimated pressure do not interfere with the work of the master, did not fall on the perforator, because of which the worker would get a blow to the current. Stopping water supply will result in rapid evaporation, throwing out the fluid available in the working area – the crown will overheat and fail.

    Types of fastening nozzles

    The lowest method is soldering. Cutting tooth or fragment manually applied to a silver substrate. The attack gives the holding effort to 12 Newtons when working. With the slightest overheating, the silver layer is melted, and the fragment falls off. Comes complete with water collector and manual water supercharger. So, for a crown of 12-32 mm per minute required to 1 l of water. Crowns up to a meter in diameter require up to 12 liters of water every minute. The dependence of water supply from the size of the crown is nonlinear.

    Welding with a laser puts the production process of drilling crowns on the flow. Fragments are perfectly smoothly, with an indentation uniform from the center of the working area.

    Power on the gap – up to 40 n / m. As a driving force – special machines, worthy of a lot, and therefore, the crowns themselves are also silence.

    Diamond layer spraying most common. It is obtained and an attack, and in the sintering. Such products break through tiles, tiles, porcelain stoneware and ceramics. Sold with a set – a specific range of working diameter corresponds to a specific set.

    Restoration of crown

    Repair crowns – a consequence of its wear, for example, when drilling steels. Worn cutting face is not subject to further use. But diamond crowns restore it is possible. First, determine the cause of the wear of the product – for this, the crown is checked for horizontal vibration. With regular wear, new diamond particles are attacked by placed old. Buying a new crown is noticeably more expensive than the restoration of the former (perhaps 5 times on one product). The need for recovery is solved by a master. The restoration of the diamond crown is made according to the following scheme:

    • The working area of ​​the crown is cleaned from worn diamond particles and residues of the packed at the point of construction materials;
    • With small horizontal beats, the carrier part of the crown is diagnosed;
    • In the case of total wear of some part of the supporting structure, it is cut, the remaining (shortened) section is cleaned in a new place to apply diamond particles.

    After attacking the new diamond abrasive, the crown is checked to the tensile strength, then color.

    Too shortened working part is not subject to restoration. Worn diamond enclosures of extension are not amenable – they are changed to new.

    Frequent errors

    First of all, the master (working) complies with safety equipment. It uses overalls, not creating threats to waters of fabrics on the crown. And rough, covered with a diamond layer, the surface can capture the matter from which the protective suit sews. Requires protective gloves, respirator and glasses, fully and tightly closing the upper part of the face.

    The most typical errors when working are as follows.

    1. Destruction or separation of the cutting teeth happens predominantly due to dry drilling or jams of the crown (jamming of the reinforcement rod).
    2. Abrasion of the nozzle in the zone of the fragment of the fragment – its sign is the changed color of the alloy. Cause – drilling without water, overheating crowns, too fast rotation of the product at work point. For example, with frequent and long work on porcelain book or steel, the crown over time is fascinated and from exceeding effort and overheating.
    3. The fragment, tilted inward, is formed when trying to bypass the standard diameter of the hole, cutting startup, sides of the armature.
    4. An element that has fallen out, speaks of too fast launch, greater than the number of cutting fragments, exceeding the necessary drive power during seerred fragments.
    5. Cracks and fears on the product itself indicate an invalid burden on the crown, including lateral exposures, horizontal beats (ravines) of the entire product. The consequence of the latter is uneven abrasion of crowns, including wear walls of the nozzle.
    6. Dents on the crown say that the product arched “egg”, it became oval. The reason is the jams of crowns, strong blows on it.

    Any other changes in the shape of the hull – a consequence of excessive wear due to excess of load.

    What does the diamond drilling of concrete look like, look next.

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