Hydraulic holder is a widely used tool holder, distinct from traditional tool holder systems with its unique clamping method. Tightening requires only one locking screw. When the bolt is tightened, it pushes the piston seal block to generate hydraulic oil pressure inside the tool holder. This pressure is evenly transmitted from the circumferential direction to the steel expansion sleeve, which then clamps the tool. This article will introduce the working principle and safe operation of the hydraulic holder.
The principle of the hydraulic holder uses two concentric pneumatic shafts to seal both ends, forming a cylindrical cavity. This cavity is filled with hydraulic oil, which is pressurized. This pressure is equally transmitted to every part of the oil chamber. The outer wall of these two concentric cylinders is relatively thin. Under pressure, it expands outward.
Based on this deformation of the thin wall, the clamping of the internal hole and the external diameter can be achieved. The thin wall uniformly withstands the oil pressure, thus achieving high clamping precision for both the inner hole and the outer diameter. The hydraulic holder was developed based on this principle and has been successfully applied to CNC machining manufacturing.
Using this tool clamping system allows the system's radial runout error and repeat positioning accuracy to be controlled within 3μm. Due to the high-pressure oil in the tool holder, when the tool is clamped, the internal oil chamber structure and the high-pressure oil significantly increase the structural damping, effectively preventing vibration of the tool and the machine spindle. Practical applications have shown that using this clamping system can not only improve machining accuracy and quality but also can exponentially increase the tool's life during cutting processing.
Additionally, this type of tool holder features maintenance-free functionality and dirt resistance, and is easy to use and safely clamps the tool.
Hydraulic holders must be operated strictly according to the operating procedures to ensure the safety of personnel and equipment. Firstly, operators need to understand the working principle and structural characteristics of the hydraulic holder, mastering its operation methods and precautions. Secondly, operators must follow operational procedures correctly to avoid accidents caused by operational mistakes and improper handling.
Furthermore, operators need to wear relevant protective gear while operating the hydraulic holder to prevent injuries from mechanical impact, hydraulic oil splash, and other unforeseen events. Additionally, if the hydraulic holder malfunctions or exhibits anomalies, operators should promptly take emergency measures to stop the equipment, and notify relevant maintenance personnel for handling, ensuring the safety of both equipment and personnel.
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