Abstract
To solve problems associated with the processing of PC steel bars, such as continuous cutting, fracture oil, and low sizing precision, an online sizing cutting scheme using an oscillating follower ...
Highlights
Steel bars are widely used in pre-stressed concrete components, such as high strength pre-stressed concrete pipe piles, centrifugal poles, viaduct piers, and railway sleepers
One end of the oscillating follower is designed with a cutter, and the cutting of the PC steel bars is realized through an up-and-down swinging motion
A single-dwell-modified sine curve is chosen as the motion law of the oscillating follower
Summary
Steel bars are widely used in pre-stressed concrete components, such as high strength pre-stressed concrete pipe piles, centrifugal poles, viaduct piers, and railway sleepers. With the improvement of automaticity, new technical requirements for the shearing machining of PC steel bars, including high accuracy of sizing cutting and reliability of online work performance,[1] have been proposed, and the defining factor of the shear mechanism design is the repetition accuracy of the shear action. An online sizing cutting scheme of oscillating follower cam for PC steel bars was proposed based on mechanical electro-hydraulic technology. The cutting mechanism of an oscillating follower cam relies on impact shear introduced via a periodic system of ‘‘start and stop,’’ starting from when the steel bars move to the setting length. To meet the technical requirements of the production line and realize the online sizing cutting of PC steel bars, the plate type of the conjugate cam mechanism with roller follower is applied. The pressure angle equations of the principal and deputy cam can be deduced and are shown in equations (8) and (9), respectively
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