Method and automatic machine for machining a gear wheel
AssigneeGE Avio S.r.l.
InventorsSalvatore Milletari, Rinaldo Siccardi
Life of this patent
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Abstract
The axis of rotation of a gear wheel subjected to thermal treatment and comprising at least one intermediate crown wheel and a pair of lateral tubular hubs arranged on opposite sides of the crown wheel is restored automatically by coupling a first of the hubs to a head rotating about a fixed axis of own rotation axis, displacing the other hub in a direction transverse to the fixed axis until both of the hubs and the crown wheel are brought into positions substantially sharing the fixed axis and providing on each of the hubs a respective centring surface sharing the fixed axis without uncoupling the first hub from the rotating head and keeping the gear wheel in a vertical and angularly fixed position.
Claims16
A method for machining a gear wheel comprising at least one outer crown wheel, a first hub and a second hub opposed to each other and projecting in cantilever fashion from opposite axial sides of said crown wheel, the method comprising the steps of:
- coupling said first hub to a motor-driven rotating head having an own fixed vertical axis of rotation;
- displacing said second hub in a direction transverse to said fixed axis;
- bringing said hubs into a position substantially sharing said fixed axis;
- and machining the hubs, providing on each of said hubs a respective inner centring surface sharing said fixed axis;
- the steps of bringing said hubs into a position substantially sharing said fixed axis and of machining the hubs themselves to obtain said inner centring surfaces are obtained without uncoupling said first hub from said motor-driven rotating head.
An automatic machine for machining a gear wheel, comprising at least one outer crown wheel, a first hub, and a second hub opposed to each other and projecting in cantilever fashion from opposite axial sides of said crown wheel, the machine comprising a motor-driven rotating head having an own fixed vertical axis of rotation and comprising motor-driven retention means and controllable-retention means, the machine further comprising motor-driven movement means for displacing said second hub in a direction transverse to said fixed vertical axis to bring it into a position substantially sharing said fixed vertical axis, a first motor-driven tool head and a second motor-driven tool head that are mutually independent for obtaining on the first and on second hubs, respectively, a respective inner centring surface sharing said fixed vertical axis, a plurality of position sensors, which co-operate with respective surfaces of the gear wheel for detecting the deviation of the surfaces themselves from said fixed vertical axis and are designed to issue respective electrical position signals, and a control unit for processing the electrical signals issued by said position sensors and issuing signals for controlling said motor-driven heads, said sensors, and said motor-driven retention and movement means, as a function of the signals issued by said position sensors.
Dependencies are inferred from the claim text.