Vitrified bond (V)
Vitrified bond systems have largely prevailed in precision grinding. A major advantage of vitrified bonding is the controllable porosity. The appropriate microstructure is selected depending upon the size of the contact zone between the work piece and the grinding wheel.
Generally speaking, the larger the contact zone, the more open and porous the grinding wheel needs to be. Highly porous grinding wheels are in particularl needed for productive deep and creep-feed grinding processes to transport the cutting fluid directly into the contact zone and to optimally remove the generated grinding chips and heat. A product of this group is for example the successful KREBS MULTO grinding wheels.
CBN and diamond
Top high-precision grinding of hard iron and steel alloys or hard and brittle materials, the best removal rates and the longest service life are still provided by the hardest materials in the world: CBN and diamond.
Cubic boron nitride, CBN for short, is particularly suited to difficult to machine or high-alloyed hardened steels with a hardness of 54 HRC or more such as high-speed steel, tool or chrome steel, nickel-based alloys, powder metallurgy steels or white cast iron.
Resinoid bond (B/BF)
The resinoid bond is a bond type well tailored to the grinding task. In resinoid bonds, resins are used as binders, into which fillers are mixed in addition to the abrasive grains. Resinoid-bonded grinding wheels are characterised by having a good cutting performance and cool grinding. Compared with vitrified bonds, resinoid bonds are known as soft, fast and cool grinding bonds. They have a very wide range of applications.
Depending upon the application, the bonds can be used for either dry or wet grinding. Based on the production methods and the low curing temperatures, grinding tools with resinoid bond are usually the least expensive among the different bond systems. Due to the low curing temperature, they can easily be used for all types of abrasives.
Gear grinding
Gears are among the most important mechanical elements in the construction of transmissions, vehicles and machinery. The requirements placed on these products in terms of power transmission or running smoothness continue to rise steadily.
Grinding is therefore one of the most important methods for meeting these high demands. For this purpose, KREBS & RIEDEL provides proven grinding tools for virtually all types of machines.
Super-hardened, ceramic-bonded disc grinding wheels
KREBS & RIEDEL produces modern disc grinding wheels with an outer diameter of 400 to 1200 mm, made of diamond and CBN with ceramic bonding, to efficiently create flat surfaces of high quality and tolerance for a multitude of different materials.
Our range includes grinding tools with various segmentation and pelletising properties for single-disc machines and double-disc machines with or without planetary kinematics. The tools are made exclusively with ceramic bonding. This bond system allows the production of very easy cutting and porous surface structures in comparison to other bond systems. This makes it possible to achieve a considerable increase in productivity with better cost-effectiveness in most cases. This bond has proven to deliver excellent performance especially in the processing of a wide range of different ceramics, cast materials, sintered metals, tempered steels and carbide products.
Cutting and rough grinding applications
Cut-off wheels are the most widely used tool for removal of risers and runners. Depending on the application, stationary cut-off machines or swing frame cutters are used. They easily cut sanded or mineralised castings. High-alloy work pieces such as exhaust manifolds and turbine blades can be economically machined with cut-off wheels.
For this purpose, KREBS & RIEDEL provides powerful cut-off wheels, reinforced with glass fibre offering maximum safety. Depending on the application, we provides straight discs or discs with a depressed centre.
Automotive
Whereas in the past the trend was more towards naturally aspirated engines with high-rev concepts, in recent years there has been a shift towards downsizing – small engines with turbocharging. Increasingly stringent requirements in terms of fuel consumption and exhaust emissions make modern engine construction a challenge at all levels.
Lightweight construction, reduction of friction and low CO2 emissions have top priority. In order to achieve these requirements, the highest demands are placed on production. As a result, the already tight specifications regarding shape and position tolerances as well as surface qualities are usually narrowed down even further.
KREBS & RIEDEL offers solutions for many applications. Just ask us!
Bearing rings
Rolling bearings serve to support and guide moving components. These mainly include axles and shafts. They are used in gearboxes, pumps, conveying elements, motors etc. Depending on the type of application, different basic forms are used, including ball, barrel and tapered bearings.
From handling technology to heavy mechanical engineering, the most diverse systems are used. Whether conventional or dressable superhard abrasives. KREBS & RIEDEL has been offering economical solutions for grinding for years.
