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发表于 2023-2-1 10:50
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Worm Gear Generation and their Manufacturing Tools
The question will be answered considering the different possibilities in profile form, kind of mesh, and type of tools. Figure 1 contains the general nomenclature used to define the geometry parameters.
Worm gear drives can be separated in three categories:
Case A. Crossed helical worm gear drives
Case B. Cylindrical worm gear drives
Case C. Double-enveloping worm gear drives
Cylindrical worm gear drives “B” are the most common form. Their tooth profiles of the worms depend on the manufacturing method. The different profile forms according to DIN 3975 are:
ZI:
Tooth profile in face section is an involute; manufactured, for example, by hobbing,like a cylindrical pinion. The hob for the worm gear manufacturing is a “duplicate” of the worm (however serrated and considering clearance and backlash).
ZA:
Profile is a trapezoid in an axial section; manufactured, for example, by turning.
ZN:
Profile is a trapezoid in a normal section; manufactured, for example, by turning with cutting blade tilted to lead angle of worm.
ZK:
Profile with crowning. Tool is disk cutter with trapezoidal profile, which is tilted to lead angle of worm. Profile crown generated depending on disk cutter diameter.
ZH:
Disk cutter with convex cutting edges, causing hollow flank profiles in axial section on worm teeth. Disk cutter axis is parallel to worm axis (not tilted like ZK).
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