Analysis of the processing principle of power skiving and the advantages of power skiving

Power skiving principle

Power skiving adopts the cutting method of hobbing and gear shaping to process internal and external cylindrical gears. In the process of gear cutting, the gear cutting tool is equivalent to both a hob and a gear shaping cutter. The tool rotates continuously, combining hobbing and shaping movements to cut the teeth.

When performing strong tooth scraping, the tool has an axis intersecting angle relative to the workpiece, and rotates around its own axis with the workpiece to form a generating motion, and at the same time, the tool travels along the axial direction of the workpiece to cut out the full length of the workpiece.The shape of the tool is very similar to that of a gear shaper.When the workpiece is a straight tooth, the tool should be a horn tooth; when the workpiece is a horn tooth, the tool is generally made of a straight tooth.When machining an involute tooth shape, no matter whether the tool is a straight tooth or a scallop tooth, the tooth shape in the end section is all involute.

The theoretical cutting edge shape of the tool should be manufactured according to the contact line on the tooth surface of the tool when the tool is engaged with the workpiece.Therefore, when the tool is a straight tooth, the cutting edge is involute on the end plane of the tool; when the tool is a scallop tooth, the cutting edge is the intersection of the involute helical surface and the hyperboloid of revolution.When machining gears, the cutting edge of the tool is at the contact line position during the meshing process. When the tool is blunt, it is sharpened according to its front.

Advantages of Power Skiving

Compared with gear-shaping processing, the production efficiency of internal meshing gears is 4~4.2 times higher than that of gear-shaping processing; and the machining accuracy, gear-shaping is DIN 8 grade, and strong tooth-shaping is DIN 7 grade. For this reason, if the same In the case of machining accuracy, the potential production efficiency of strong tooth scraping can be 6 to 8 times that of tooth shaping, so strong tooth scraping is an extremely economical processing technology that is expected to replace tooth shaping. Can be more than 4~8 times higher; machining accuracy can reach DIN 7 grade or higher, and tooth surface roughness is Rz 4; the tool cost for machining a workpiece is the same or lower; the machine takes less floor space; single-piece machining cost Decreased significantly.

Although strong gear skiving has many advantages over gear shaping, strong gear skiving cannot completely replace gear shaping at present. Tooth machining.