Hobbing machine classification
The hobbing machine is divided into two types according to the layout: vertical and horizontal. Large and medium hobbing machines are mostly vertical, small hobbing machines and hobbing machines dedicated to machining long shaft gears are horizontal. The vertical gear hobbing machine is divided into two types: table movement and column movement. When the vertical gear hobbing machine is working, the hob is mounted on the hob spindle, and the main motor is driven to rotate. The tool holder can move vertically along the column guide rail, and can also adjust an angle around the horizontal axis. The workpiece is mounted on the workbench and is rotated by the indexing worm gear pair to form a forming motion together with the motion of the hob. When the helical gear is rolled, the differential mechanism causes the workpiece to perform a corresponding additional rotation. The table (or column) can be moved along the bed to accommodate different workpiece diameters and radial feeds. The tool holder of some hobbing machines can also be moved in the direction of the axis of the hob to machine the worm gear by tangential feeding. The large hobbing machine also has a single-tooth indexing mechanism, a finger-milling tool holder and a differential reversing mechanism for machining the herringbone gear.