







Tool magazine screws are pivotal fasteners integral to CNC machine tools, machining centers, and automated tool changing equipment. They work diligently to secure various tool magazine components, including tool heads, holders, drive modules, and sensors. The performance of these screws directly influences the stability, precision in tool changing, and the longevity of the equipment. Delve into the intricate details presented below, covering functional positioning, structural classification, technical parameters, selection criteria, and solutions to common issues for a comprehensive understanding.
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The essential role of the knife magazine screw
1. Mechanical connection and fixation
-The disc/chain type tool magazine is securely fastened to the machine tool body, drive motor, and tool holder among other components. This ensures that the magazine's structure remains steadfast, free from looseness or misalignment during high-speed rotations or tool exchanges.
Example: The motor mounting screws of the knife magazine must effectively handle the instant torque during motor start-up, preventing any vibration-induced displacement of the motor.
2. Position accuracy assurance
High-precision thread matching (e.g., tolerance level 6g/6H) is employed to maintain the positional accuracy of tool magazine components (such as tool holder mounting holes and sensor brackets) within a precision range of ≤± 0.02mm, thus facilitating impeccable alignment between the tool holder and spindle during tool swaps.
Data: High-precision tool magazine screws boast a coaxiality error of ≤ 0.01mm, mitigating the risk of tool holder eccentricity due to tool change impact.
3. Resilience against fatigue and longevity
• They endure the dynamic load induced by the frequent start and stop cycles of the tool magazine (capable of 20-60 tool changes per minute), thereby averting thread fatigue and possible failure.
Case: A notable brand of machining center encountered thread slippage in their tool magazine screws within 3 months, attributed to the absence of high-strength grades.
4. Environmental resilience
Designed to withstand corrosion from industrial atmospheres, including cutting fluids, cooling oils, and metal debris, these screws prevent breakage or jamming from rust.
• Testing: Surpassing a 72-hour salt spray test with no signs of corrosion, ensuring steadfast reliability even in humid conditions.
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