CUTMETALL News Archive

Eisfeld/Bamberg, 22 January 2013. Waste, paper or wood – the possibilities of cutting crowns are manifold and are by no means exhausted with the aforementioned three areas. The bottom line is that the life-time, good cutting results and the economic efficiency of industrial knives count.

Plant operators want to rely on good qualities and save with every use – on machines downtime diameter failures and knife changes, on current through well-cutting industrial knives and on expenditure for new cutting crowns.

For installations that use a multitude of cutting crowns through their input material, the operator must be able to rely on consistent qualities and designs of his cutting crowns. It requires industrial knives that are identical in material composition, structure and hardness, and above all the quality, and are also readily available as serial products.

But there are numerous suppliers of these small machine knives on the market, whose quality level cannot be seen at first sight. Which manufacturer is the right one? Which cutting crown do I need exactly? Which material and hardness is the right one for my cutting crown? Basic questions for a good cutting crown and questions to decide – about the quality of the output material and the company's success.

As one of the leading German manufacturers of industrial knives, CutMetall GmbH offers a comprehensive portfolio of cutting crowns – in a wide variety of sizes and geometries, with various drilling holes and a variety of materials, From tool steel to very specific carbide

But what exactly are cutting crowns and how are they used?

In many recycling plants, many of these small metal blocks are screwed together in several rows. The appearance is rather small and inconspicuous, but the appearance is deceptive – with its four cutting edges, these industrial knives are able to crush a lot of input material.

Cutting crowns, which are also called concave knives or diamond knives, can be used in a wide variety of industrial areas. Depending on the size of the plant, ten, in large shredders, can be screwed up to 400 cutting crowns on knife holders and cut the most different materials in the plant operation. Due to their specific square shape, concave knives have four instead of the usual two cutting edges. This doubled cutting surface makes it possible to rotate concave knives after rounding a cutting side, which means that input materials are chopped longer and the life of the knives is increased.

Also in the shredding system, cutting crowns can be adapted to the respective requirements and can therefore be used flexibly. The most commonly used checker knives are mounted on the moving rotor, which is the rotor blade. With the help of a special knife holder, however, they can also be used as a fixed stator unit.

Diverse in size, material and hardness – easy to handle
The type and texture of cutting crowns is very variable and diverse-they can be very small from their dimensions, but also be manufactured in large versions. The product portfolio of the CutMetall components GmbH includes cutting crowns with an edge length from 17 millimeters up to diamond knives with a dimension of up to 145 millimeters.

Due to the very different loads that cutting crowns are exposed to, these industrial knives can be made of different materials. For example, standard cutting crowns are made of tempered steel, but under certain conditions and with very abrasive materials, they are also useful in the carbide version or can be armored. In order to determine the correct material for the cutting crown, analyses of the input and the determination of the abrasive properties of this material are constant. The experienced team of CutMetall Components GmbH advises customers on this in detail and, with the help of various tests, manufactures the appropriate industrial knives for individual challenges.
In addition to the knife size and the material used, the hardness levels of the cutting crowns can also be adapted to the individual application conditions. Whether a knife with 55 HRC (hardness test according to Rockwell) or 62 HRC cuts, is located on the material to the shredded material. 

These requirements are also crucial in the choice of geometry shape. Thus there are flat cutting crowns, which are also called cutting plates, as well as inserts, concave knives and knives with various cuts. In addition, concave knives can be manufactured with different sized drill holes and thus adapted to the respective plant shape.
With only one drill hole for screwing, cutting crowns are extremely easy to handle – they are quickly attached to the knife sled and changed as quickly.