In the use of milling machine for processing, we often encounter milling hexagonal, gear, spline and engraved line and so on. At this time, the workpiece after each milling or - slot, you need to turn an angle, and then milling the second side, the second slot and so on. This work is called dividing. Dividing head is based on processing needs, the workpiece in the horizontal, vertical and tilt the location of the organization. One of the most common is the universal dividing head.
1. The use of the dividing head
Lift table mill machine is equipped with a variety of accessories, used to expand the scope of technology, including universal dividing head is a commonly used accessories. The machined workpieces are mounted on the top or chuck of the universal indexing head spindle and can be operated as follows:
①the workpiece around the axis of a certain degree of rotation to complete the equal or unequal circle indexing work. Such as processing square head, hexagonal head, gear, sprocket and unequal knife reamer and so on.
②through the replacement gear, by the dividing head drive the workpiece continuous rotation, and milling machine table with the vertical feed movement, can be processed spiral groove, helical gear and Archimedes spiral cam.
③holding the workpiece with a chuck, so that the workpiece axis relative to the milling machine table tilted a required angle, for processing and the workpiece axis intersect a certain angle of the groove or plane.
2.The construction of the universal dividing head
The following to FW125 universal dividing head as an example, indicating the structure and adjustment method of the automatic universal milling machine dividing head. In the figure, the dividing head spindle 2 is mounted in the drum-shaped casing 4, which is supported on both sides by a journal on both sides and rotatable about its axis so that the spindle is adjusted to a desired angle within a range of 95°above the horizontal line The The front end of the dividing head has a taper hole for the installation of the top 1, with a bit of a pyramid on the outside for the installation of a three-jaw chuck. Turn the dividing handle K, the transmission ratio u = 1/40 worm gear pair, driven by the dividing head spindle to the desired dividing position.The number of revolutions of the dividing handle K at the indexing is determined by the number of holes in the perforations of the dividing plate 7 by the latch J. These holes are distributed on the concentric circles with equal number of holes on the end of the dividing disc. FW125 indexing head with three sub-dial, for the selection of sub-degree, each sub-plate has 8 holes, the number of holes per hole were:
the first 16、24、30、36、41、47、57、59
the second 23、25、28、33、39、43、51、61
the third 22、27、29、31、37、49、53、63