What is hydraulic tensioning?

What is hydraulic tensioning?

A hydraulic bolt tensioning tool provides a quick and easy method for tightening large diameter bolts to high and accurate pre-loads. Unlike conventional methods it does not use torque and does not require any forceful turning of the nut or bolt, like impact wrenches, flogging spanners or hydraulic torque wrenches.

What is the difference between torquing and tensioning?

“Torque” is simply a measurement of the twisting force required to spin the nut up along the threads of a bolt, whereas “Tension” is the stretch or elongation of a bolt that provides the clamping force of a joint. This is the most common form of providing load to a bolt.

Why bolt tensioning is required?

The objective of tensioning is to stretch the bolt, or stud, to a predetermined load, by using force to elongate the shank. Very little turning force is required. It is necessary to have some extra thread above the nut, which is used to attach the pulling cylinder, which is removed after completion.

How does a hydraulic torque wrench work?

The hydraulic torque wrench works by using the power generated by the hydraulic pressure. Its function is mainly to adjust the tightness of the bolt, thereby promoting the smooth development of the production work and helping people to reduce the burden.

How does a stud tensioner work?

In bolt tensioning, the bolt is preloaded, stretching it before the nut is tightened. The tensioner is clamped to the bolt’s threads and pushes against the flange in the surface being bolted. This provides a very consistent amount of stretch to the bolt, ensuring clamping force.

Can you reuse bolts that have been torqued?

Mechanically, bolts may be reused provided the bolt never exceeded its yield point: a simple enough definition, but one that is more complicated than it may appear. This is because it is nearly impossible to verify if a bolt has ever been tensioned past the yield point.

What is tensioning bolt?

What is Bolt Tensioning. Tensioning is the direct axial stretching of the bolt to achieve preload. Inaccuracies created through friction are eliminated. Massive mechanical effort to create torque is replaced with simple hydraulic pressure. A uniform load can be applied by tensioning multiple studs simultaneously.

How do hydraulic tensioners work?

A hydraulic tensioner system consists of a hydraulic actuator in combination with a tensioner pulley. High dynamic belt loads are controlled by hydraulic damping. This damping is created when engine loads force the piston rod to move inwards displacing the oil in the cylinder.

What happens if you overtorque a bolt?

One of the most damaging ways to do that is by over-tightening, or over torquing the fastener. This can result in stripping screws, snapping screw heads and damaging pre-tapped threading.

How does a hydraulic impact wrench work?

An impact wrench has an electric or air motor that applies a sudden, intense twisting motion to the recalcitrant lug nut, usually in short bursts (every five seconds or so). The continuous short, strong bursts of force trying to twist on the fastener are what eventually bring some movement (loosening or tightening).