A gear hobbing machine is a gear processing machine that uses a hob to process straight, helical, and herringbone cylindrical gears, as well as worm gears, according to the generation method.
A gear processing machine tool for machining straight, helical, and herringbone cylindrical gears, as well as worm gears, using a hob according to the generative method. This machine tool can also process various special tooth shaped workpieces such as splines and sprockets when using specially designed hobs. The machining accuracy of general gear hobbing machines is 7-6 levels, while gear hobbing machines are 4-3 levels. The maximum machining diameter is 15 meters.
Gear hobbing machines are divided into two types according to layout: vertical and horizontal. Large and medium-sized gear hobbing machines are mostly vertical, while small gear hobbing machines and gear hobbing machines specifically designed for processing long shaft gears are both horizontal. Vertical gear hobbing machines are divided into two types: worktable movement and column movement. When working on a vertical gear hobbing machine, the hob is installed on the hob spindle and driven by the main motor for rotational motion. The tool holder can move straight along the column guide rolling and can also adjust an angle around the horizontal axis. The workpiece is installed on the workbench and rotated by the indexing worm gear pair, forming a generative motion along with the motion of the hob. When rolling helical gears, the differential organization causes the workpiece to undergo corresponding additional rotation. The worktable can move along the bed to accommodate different workpiece diameters and radial feed. Some gear hobbing machines also have a tool holder that can move along the axis of the hob to facilitate the use of tangential feed method for machining worm gears. The large gear hobbing machine also has a single tooth indexing organization, a finger shaped milling cutter holder, and a differential reversing organization for processing herringbone gears.
