Forming method for milling threads of variable tooth worms

US7044691B2 · kind B2 · utility

Assignee

• Tsubaki Emerson Gear (Tianjin) Co., Ltd. · CN

Inventors

• Yaxiong Zhang · Beijing, CN
• Lin Qi · Hunan, CN

Key dates

• Filing date: May 19, 2003
• Grant date: May 16, 2006
• Expiry date: Nov 8, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T409/107473
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A forming method for milling teeth of variable tooth worms (VTW) with the following features: on a multi-axis simultaneously-working CNC machine-tool a moving coordinate system {σ1(φ1)[O1;{right arrow over (i)}1(φ1),{right arrow over (j)}1(φ1),{right arrow over (k)}1 (φ1)]} is correlated to the worm blank of the VTW worms, whereon the worm blank of the VTW worms rotates around {right arrow over (k)}1(φ1)-axis at angular speed |{right arrow over (ω)}1|; another moving coordinate system {σ2(φ2)[O2; {right arrow over (i)}2(φ2), {right arrow over (j)}2(φ2), {right arrow over (k)}2(φ2)]} is correlated to the milling cutter, whereon the milling-cutter rotates around {right arrow over (k)}2(φ2)-axis at angular speed |{right arrow over (ω)}2|, |{right arrow over (ω)}1|/|{right arrow over (ω)}2|=i12 and i12 is a constant; the feed motion of the milling cutter comprises the radial shift along {right arrow over (i)}2(o2)-axis and the peripheral shift around {right arrow over (k)}2(φ2)-axis; the equations of the cutting edge of the milling cutter are given as belowx=uy2=rb−v sin βz2=v cos β.