The gear with no undercut chevron shape has the advantages of compact transmission arrangement and high machining precision, and must be processed on special machine tools, such as German SHNO12 type and British 30DH type herringbone gear shaping machine. The machining machine has a relatively high rigidity and a high movement precision of the transmission chain, so that a high machining accuracy can be obtained. Since it is a rack-shaped tool (the tool motion error value is reduced and the relative error is reduced), the machining is simple and easy to maintain the accuracy, so that the gear tooth profile error generated by the tool can be well controlled.
During the processing of the gear, the tool reciprocates in the tooth direction, so that the flank direction of the tooth surface coincides with the direction of the contact line, so that the tooth direction caused by the tooth shape error and the tooth direction error can be reduced during the running and working of the gear. The load distribution is uneven, and the tooth surface contact rate is improved. However, due to the limitation of the length of the cutting tool, the cutting motion of the magnetic powder clutch is not continuous but periodic, so it affects the accuracy of the base of the cut gear.
Another most common method of machining a herringbone gear is the undercut hobbing. This method does not require a dedicated processing machine, and has the advantages of low cost and high production efficiency. Since the sipe needs to be left behind, when the total width of the gear is limited, the tooth width of the participating work is reduced, and the gear carrying capacity is reduced.
There are over-slotted herringbone gears that are machined on ordinary hobbing machines. The main factors affecting the accuracy of gear machining are the accuracy of the hob, the adjustment of the tool and the blank. In general, the gear tooth profile error caused by the hob manufacturing error is difficult to control, and the base section error and the tooth direction error can be better controlled by careful adjustment of the tool, the blank and the machine tool. However, since the hobbing direction is different from the tooth direction (angular gear), the flank direction of the tooth surface is inconsistent with the direction of the contact line. Therefore, the hobbing processing method is not conducive to improving the tooth surface contact rate, and the error is during running and working. Not easy to eliminate.
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