Planar Double Enveloping Hob: A Breakthrough in Precision Manufacturing
Classification： Blog
Release time：2025-10-21
Planar Double Enveloping Hob: A Breakthrough in Precision Manufacturing
China has achieved a significant leap in planar double enveloping hob technology, transitioning from import dependence to independent innovation. Supported by the national "High-end CNC Machine Tools and Basic Manufacturing Equipment" science and technology project, domestic enterprises have successfully developed 800mm ultra-large hobs, breaking the technical monopoly of German companies with a price only one-third of imported products. In 2023, a leading tool manufacturing company reported a 65% year-on-year growth in export volume of such products, which are now sold to manufacturing powerhouses like Germany and Japan.
The core advantage lies in its innovative "double enveloping" design: the first enveloping forms the basic tooth profile by grinding the tool along the theoretical tooth surface trajectory; the second enveloping simulates the meshing process of worm and worm gear to correct tooth surface curvature, ensuring line contact characteristics during transmission. This design enables automatic compensation of tooth profile errors during processing, resulting in a worm tooth surface smoothness of Ra0.8μm, far exceeding the Ra3.2μm of ordinary hobs.
In industrial manufacturing, transmission components machined using planar double-enveloping hobbing have been widely adopted in CNC machine tools, delivering high-precision, high-rigidity power transmission for metalworking. Within the rubber and plastics industry, their stable torque output reduces equipment failure rates by 40% in tire molding vulcanizing machines. In the energy and power sector, this hobbing technology enables upgrades to thermal power generation equipment. Within boiler coal feeder transmission systems, it withstands continuous heavy-duty operation, extending mean time between failures. Wind turbine yaw systems incorporating its machined worm gears enhance wind direction adjustment precision, boosting wind energy capture efficiency. In transportation, port cranes utilizing this technology reduce heavy-load positioning errors to 2mm, boosting loading/unloading efficiency. Ship steering gear systems achieve precise control of turning angles through its transmission components, maintaining 98% reliability even in harsh sea conditions to ensure navigational safety.
In summary, the planar quadratic enveloping hob, through its innovative dual-enveloping design, not only overcomes the limitations of traditional machining techniques but also demonstrates outstanding performance in critical sectors such as industrial manufacturing, energy and power, and transportation. It provides core support for achieving precision and efficiency in high-end equipment, driving the quality upgrade and industrial transformation of China's equipment manufacturing industry.
keyword： Planar Double Enveloping Hob