industrial roller chain drive is a meshing drive with intermediate flexible parts, with gear drive and belt drive characteristics. Compared with the gear transmission, the manufacturing and installation precision of industrial roller chain transmission is lower; compared with the friction type belt transmission, the average transmission ratio of industrial roller chain transmission is accurate, and the transmission efficiency is slightly higher.

1. The main disadvantages of industrial roller chain drive.

It cannot keep the instantaneous transmission ratio constant and is noisy when working; it is easy to jump teeth after wear and tear.

2. Common failure modes of industrial roller chains.

(1) Normal wear.

Normal wear and tear usually occur in the weight-bearing area of the pin bushing. With wear, the chain gradually elongates. The wear rate of the chain is greatly influenced by lubrication. After proper lubrication, the load-bearing surface of the pin and bushing will look shiny and smooth.

(2) Excessive wear.

Excessive wear is insufficient lubrication if the load-bearing surface is discolored (brownish-red oxide). Micro-movement corrosion has begun, and the resulting abrasive oxides will greatly increase the wear rate.

(3) Abnormal wear.

Insufficient lubrication or excessive working speed will cause wear or metal particles to come off the load-bearing surface. The pin and sleeve mating surfaces are welded together and then break off as they bend over the sprocket.

(4) Fracture of the side plate.

This failure occurs when the ultimate tensile strength of the industrial roller chain is exceeded (when the chain is subjected to a one-time load greater than its capacity to withstand).

(5) Pin fracture.

Pin fracture may also be the result of tensile failure. When an industrial roller chain breaks due to vibration or overload, all its components will be affected, even though the unbroken part may sound loud.

(6) Fatigue failure of side plates.

Fatigue failure is caused by repeated cyclic loading exceeding the limit or rating of industrial roller chains. Overload and its frequency of occurrence are the factors that determine fatigue. Overloads can be continuous or intermittent (impulse loads).

(7) Sleeve fatigue failure.

Be sure to check the sprocket for worn gears or tooth root build-up. Fatigue manifests as circumferential cracking near the sleeve attachment plate or along the sleeve length. Both types of cracks may also be present in the same bushing. Do not attempt to repair the chain if bushing cracks are evident. Determine and repair the cause of the failure, then replace the entire industrial roller chain.

(8) industrial roller chain stress corrosion.

This type of failure may be caused by operation in acidic or alkaline media or environments. Carbon steel and some grades of stainless steel will suffer stress corrosion cracking when exposed to corrosive environments. In addition, carbon steel chains exposed to wet environments can also cause rusting and stress corrosion cracking.

3. industrial roller chain failure analysis means.

Generally speaking, when the industrial roller chain fails, we can make a preliminary inspection with the naked eye and make a prediction. We can observe the fracture shape, material organization defect, fracture grain size, and stress corrosion for fracture failure. We can also observe the precipitation of carbon or corrosion medium particles along the grain boundary. Metal section analysis can include internal and external tissue types that can be easily distinguished, the distribution of hardened layers, etc. In addition, we can do mechanical bench testing, mass spectrometry, and energy spectrometry to study the chemical composition of industrial roller chains.

The above is the failure analysis of the industrial roller chain. If you need more detailed information, welcome to contact us!