What is a fracture split connecting rod?
Fracture split steel connecting rod has been developed for new passenger diesel engines for its advantages in cost saving and better performance. The splitting type of steel con rod is made of high carbon micro-alloyed steel with no additional heat treatment after hot forging.
How do they make fractured connecting rods?
The fracture apparatus consists of a two-piece cylinder (split along the desired fracture plane), fitting closely into the rod’s big-end bore. It is pierced for a wedge. The wedge carries a striker cap, against which a falling weight impacts to rapidly strain the rod cap, resulting in fracture.
How are con rods made?
There are two manufacturing processes used to make high performance connecting rods today: forging and billet. Both processes have unique pros and cons, and both produce a very strong finished product when quality manufacturing processes and materials are used.
What is a rod cap?
A rod cap is the removable section of a two-piece connecting rod that provides a bearing surface for the crankpin journal. The rod cap is attached to the connecting rod with two cap screws for installation and removal from the crankshaft.
What is the primary advantage of a cracked connecting rod?
Cracking doesn’t have any disadvantages but it does have one major advantage: it ensures that the connecting rod shank and the bearing cap fit precisely.
What is connecting rod bearing?
Connecting rod bearings provide rotating motion of the crank pin within the. connecting rod, which transmits cycling loads applied to the piston. Connecting rod bearings are mounted in the Big end of the connecting rod. A bearing consists of two parts (commonly interchangeable).
What are the benefits of a crack fractured connecting rod?
Why are connecting rods forged?
The strength of forged steel connecting rod is higher than powder metallurgy rod. Due to this the engine compression ratio increased. As a result, high strength of forged connecting rod became more satisfactory. This forging method could meet both the strict requirements of weight and size tolerance.
What are con rods made of?
A connecting rod with a tension load is made of forged steel, cast steel, or fabricated steel. Rods with a compression loading are cast nodular steel or aluminum alloy.
Are connecting rods forged or cast?
Connecting rods are typed by the process used to manufacture the rods. The process of making forged connecting rods constitutes forcing the grain of the selected material, such as a steel alloy, in the specified shape of the rod.
What causes rod bearing failure?
Lack of lubrication is the number one cause of rod bearing failure. The root cause of the issue could be anything from a low oil level to a faulty oil pump. Clogged oiling passages can also lead to isolated bearing failures.
What is connecting rod fracture splitting technology?
Connecting rod fracture splitting is a novel connecting rod big end separation precision machining technology. It has become one of the critical technologies in engine production in developed countries.
What is fracture splitting method?
The fracture splitting method is an innovative processing technique in the field of the automobile engine connecting rod (con/rod) manufacturing. Compared with traditional method, the technique has remarkable advantages. It can decrease manufacturing procedures, reduce equipment and tools investment and save energy.
How does a fracture apparatus work?
The fracture apparatus consists of a two-piece cylinder (split along the desired fracture plane), fitting closely into the rod’s big-end bore. It is pierced for a wedge. The wedge carries a striker cap, against which a falling weight impacts to rapidly strain the rod cap, resulting in fracture.
How does crack propagation state affect fracture surface defects?
Three-dimensional crack propagation state is described, and the stress and deformation of the crack tip are analyzed. The essence of the fracture surface defects, such as drop-dregs, steps, and crack bifurcations, are mainly due to the change of the crack path and structure during crack propagation.