Patent ID: 7549312
Filing Date: 2009-06-23
Classification: B21D,Y10T

Abstract:
1. A concentric machining device for a roller comprising: a movable upper base providing an upper mold inside; a stationary lower base providing a lower mold inside opposite to the upper base; a first and a second movable mold seats with the first mold seat being disposed near a lateral side of the lower base and the second mold seat being disposed near another lateral side of the lower base, and the two mold seats being arranged opposite to each other; a first and a second slide rods being disposed between the lower base and the first mold seat and between the lower base and the second mold seat such that the mold seats are capable of sliding along the slide rods and are maintained in a concentric axial line during the machining of roller; a first hydraulic cylinder being attached to the rear side of the first mold seat for moving the first mold seat; a second hydraulic cylinder being attached to the rear side of the second mold seat for moving the second mold seat; a third hydraulic cylinder being disposed on and connected to the upper base for moving the upper base; a fourth hydraulic cylinder being disposed at the rear side of the second hydraulic cylinder; wherein, each of the mold seats has a forming mold inside, the forming mold has a fitting hole with an enlarged conical opening at the front side thereof, a locating shaft is received in the forming mold of the first mold seat and penetrates the fitting hole thereof and the first cylinder member, a clamping shaft is received in the forming mold of the second mold seat and penetrates the fitting hole thereof and the second hydraulic cylinder to connect with the fourth hydraulic cylinder; whereby, the roller is placed on the lower base with an end thereof keeping contact with the locating shaft and another end thereof being pressed with the clamping shaft, which is subjected to a pushing force from the fourth hydraulic cylinder, the roller is held by the upper base, which is moved by the third hydraulic cylinder, and both ends of the roller is machined by the forming molds at the same time to provide a squeezed and shrunk shapes once the mold seats are actuated to move forward by the first and second cylinders.