Hydrostatic worm gear and rack systems (often referred to as hydrostatic worm rack drives) are high-precision linear motion systems used primarily in large-scale, heavy-duty machine tools. Unlike traditional mechanical systems where metal teeth touch, these systems use a pressurized oil film to separate components, virtually eliminating friction and wear. Working Principle & Design The system consists of a worm (threaded screw) and a rack (internally threaded or toothed member). The "hydrostatic" element comes from specialized oil pockets integrated into the teeth of the worm or the rack. Oil Film Separation: High-pressure oil is pumped into these pockets, creating a consistent thin film (hydrostatic bearing) between the worm threads and rack teeth. This ensures there is no metal-to-metal contact during operation. Constant Mesh: The worm rotates against the rack, and the pressurized oil transmits the force, converting rotational motion into smooth, high-torque linear motion. Axial Control: The axial position of the worm is often fixed by additional hydrostatic thrust bearings to handle high axial loads without backlash. Key Advantages Extreme Precision: Because the oil film dampens vibrations and compensates for minor geometric errors, these drives offer exceptional positioning accuracy over long distances (often >10 meters) . Zero Wear: No physical contact means the components do not wear down over time, maintaining "as-new" precision for decades. High Rigidity: The oil film provides high dynamic and static stiffness, which is critical for maintaining accuracy under heavy cutting loads. Smooth Motion: They eliminate "stick-slip" effects common in mechanical drives, allowing for extremely smooth movement even at very low speeds. Major Applications These systems are reserved for high-end industrial machinery where standard rack and pinion or ball screws lack sufficient load capacity or accuracy. Machine Tools: Used in the X-axes of large portal milling machines, boring mills, and grinding machines (e.g., travel lengths exceeding 14,000 mm).

Process:

1. Milling Process * It is the most basic worm rack processing technology, divided into two types: disc milling cutter milling and finger milling cutter milling. 2. Shaping Process * Using a gear shaper cutter to process the worm rack tooth profile by the generating method, which can process straight-tooth and helical-tooth worm racks. 3. Hobbing Process * Using a special worm rack hob, continuous cutting according to the generating principle, it is one of the processes with the highest efficiency and precision at present. 4. Grinding Process

Applications

Tianjin Haorongshengye gears can be used on Precision cutting machines.Lathes machine, Milling machines, Grinders machine, Automated mechanical systems, Automated warehousing systems.