KMD Premium Wear-Resistant Long-Life Roller Chains
KMD Premium Wear-Resistant Long-Life Roller Chains
At the end of 2017 Koptchev & Sons Ltd. launched a new series under its registered trademark “KMD chain” Long-life roller chains PREMIUM
KMD Premium are special-design chains whose parameters guarantee higher wear resistance and longer life. They are designed for heavy-duty operating conditions – high loads, continuous operation, heavy dust, production requiring the least possible chain replacement, etc. Of course PREMIUM can also be used in normal and medium-heavy operating conditions, where they simply make maintenance easier, as they last 2 to 3 times longer than normal chains without replacement. They are available as simplex, duplex and triplex chains to European standard DIN 8187 and American standard DIN 8188.
The main advantages of the new series PREMIUM are:
Seamless bushes and rollers – until now this combination was available only in chains from the very high price range! It ensures that when the chain is running, the stress on its working surface is distributed absolutely evenly over the bearing parts instead of being concentrated in certain areas. This means much slower wear and therefore a considerably longer service life!
standard chain with a split bush
KMD Premium with a solid seamless bush
The side plates are taller in the middle. This helps distribute the working load better, reduces vibration and greatly increases fatigue resistance, considerably extending the life of the chain.
1. standard chain
2. KMD PREMIUM with a wide plate
Four-point riveting instead of the standard two-point, for greater strength!
Special mechanical shot-peening of the plate holes. This is where the pins contact the plates, and this treatment ensures perfectly round holes and the best possible riveting. As a result the chain life increases considerably.
Every chain is pre-loaded to 30–50% of the breaking load, which prevents initial stretching after installation and possible stretching during operation.
The individual chain components are sand-blasted, which improves the internal microstructure, reduces stress and increases the breaking load.
Unlike liquid lubricant, which evaporates quickly as the chain heats up, grease melts slowly and keeps lubricating the chain. Better and longer lubrication of the chain components means less wear and a longer life.
KMD Premium chains have a very small twist angle – max. 7 degrees per 3 m, with freely rotating components.
Every chain is marked KMD on the plates – for better traceability and identification.
The chains KMD Premium are considerably lower priced than other chains with seamless bushes and waisted plates. All chains come with an inspection certificate according to EN 10204-3.1
The chains of the new series PREMIUM were tested at the independent accredited laboratory Multitest in Varna, and the test results prove:
Higher breaking load than the DIN nominal value No elongation under a load of 50% of the working load Surface hardness HRC, measured at three points on each component – pin, bush, roller, inner and outer plate – meets the requirements and is uniform on each component Case hardening HV1, measured 0.25 mm below the surface in three zones of each component – pin, bush, roller, inner and outer plate – meets the requirements and is uniform on each component