As a high-precision transmission component, double end threaded rod are widely used in machine tools, automation equipment, precision instruments, and other fields. Their operational stability directly affects the processing accuracy and production efficiency of the equipment. During long-term use, due to factors such as operating conditions, installation accuracy, and maintenance, double end threaded rod are prone to various malfunctions.
I. Reduced transmission accuracy (large positioning error, excessive backlash)
Causes of failure:
- Wear of the double threaded rod and nut, resulting in excessive clearance;
- Bending and deformation of the double threaded rod, causing axis misalignment;
- Damaged or loose support bearings;
- Insufficient lubrication leading to accelerated wear of the double threaded rod.
Solutions:
- Adjust the preload of the double end threaded bar (e.g., by adding or removing shims, or using a pre-tensioning nut); replace the double end threaded bar if wear is severe;
- Straighten the double end threaded bar; if straightening is not possible, replace it with a compatible model;
- Replace damaged bearings, re-tighten the bearing housing, and ensure the installation accuracy of the double end threaded bar;
- Regularly apply appropriate grease/oil to the double end threaded bar (select high-temperature, anti-wear type based on working conditions), clean the lubrication channels, and ensure sufficient lubrication of the threaded surface.
II. Stuttering and Abnormal Noise During Operation (Uneven movement, accompanied by metallic friction sound/vibration)
Causes of failure:
- Foreign objects entering the double threaded bar and nut assembly (metal chips, dust, impurities);
- Poor lubrication, dry friction on the double threaded bar threads;
- Deviation in parallelism between the double threaded bar and the guide rail, resulting in uneven force during operation;
- Uneven mounting surface of the double threaded bar nut seat or bearing seat.
Solutions:
- Disassemble and clean the double threaded bar and nut assembly, remove foreign objects, and replace the sealing ring if necessary (to prevent further entry of impurities and protect the double threaded bar transmission assembly);
- Replenish the lubricant, check if the lubrication system is blocked, and ensure even oil/grease supply to the double threaded bar;
- Re-calibrate the parallelism between the double threaded bar and the guide rail, adjust the mounting reference surface to ensure balanced force during the operation of the double threaded bar;
- Grind and correct the mounting surface to ensure that the flatness error is within the allowable range, and tighten the double threaded bar connecting bolts.
II. Stuttering and Abnormal Noise During Operation (Uneven movement, accompanied by metallic friction sound/vibration)
Causes of failure:
- Foreign objects entering the double end threaded rod and nut assembly (metal chips, dust, impurities);
- Poor lubrication, dry friction on the double end threaded rod;
- Deviation in parallelism between the double end threaded rod and the guide rail, resulting in uneven force during operation;
- Uneven mounting surface of the double end threaded rod seat or bearing seat.
Solutions:
- Disassemble and clean the double end threaded rod assembly, remove foreign objects, and replace the sealing ring if necessary (to prevent further entry of impurities and protect the double end threaded rod transmission assembly);
- Replenish the lubricant, check if the lubrication system is blocked, and ensure even oil/grease supply to the double end threaded rod;
- Re-calibrate the parallelism between the double end threaded rod and the guide rail, adjust the mounting reference surface to ensure balanced force during the operation of the double end threaded rod;
- Grind and correct the mounting surface to ensure that the flatness error is within the allowable range, and tighten the double end threaded rod connecting bolts.
III. Ball Screw Corrosion (Surface Rust and Pitting)
Causes of Failure:
- Humid working environment or presence of corrosive media (such as acids, alkalis, or salt spray) corroding the surface of the ball screw;
- The ball screw was not treated with rust prevention or the anti-corrosion coating is damaged;
- Failure to clean the ball screw promptly after shutdown, resulting in residual moisture/impurities causing corrosion.
Solutions for Ball Screw Corrosion:
- For slight corrosion: Polish with fine sandpaper and apply anti-rust oil/grease to the ball screw; for severe corrosion (pitting depth exceeding the standard), the ball screw needs to be replaced;
- Improve the working environment (e.g., install protective covers, dehumidification equipment), and select corrosion-resistant ball screws made of stainless steel or with chrome plating/nitriding treatment;
- Clean the ball screw surface promptly after shutdown, apply anti-rust lubricant, and perform daily maintenance.
IV. Ball Screw Nut Overheating (Abnormal temperature rise during operation)
Causes of failure:
- Excessive preload on the ball screw nut, increasing operating resistance;
- Insufficient lubrication or incorrect lubricant selection (e.g., using high-temperature grease in low-temperature environments, or using grease with unsuitable viscosity), leading to increased friction during ball screw operation;
- During high-speed operation, the ball screw rotation speed exceeds the rated value, generating excessive frictional heat;
- Poor heat dissipation (e.g., enclosed space without cooling devices, excessively high ambient temperature), preventing timely dissipation of heat generated during ball screw operation.
Solutions:
- Appropriately reduce the preload on the ball screw nut, ensuring adjustment within the required accuracy range;
- Replace with a suitable lubricant to ensure proper lubrication of the ball screw and reduce friction-generated heat;
- Reduce the ball screw operating speed to within the rated range, or select a ball screw model with a higher rated speed;
- Install cooling fans or cooling jackets, optimize ventilation in the installation space, and improve the heat dissipation efficiency of the ball screw.
V. double end threaded rod Fracture (Most commonly occurs at the shaft shoulder and thread root)
Causes of Failure:
- Load exceeds the rated load of the double end threaded rod (impact load, overload operation);
- Material defects or improper heat treatment of the double end threaded rod, resulting in insufficient strength;
- Stress concentration during installation (e.g., excessively small fillet radius at the shaft shoulder of the double end threaded rod, poor thread machining accuracy);
- Long-term high-frequency vibration leading to fatigue fracture of the double end threaded rod.
double end threaded rod Solutions:
- Replace the double end threaded rod with one that meets the load requirements (select a higher strength material, increase the diameter), and avoid overload operation;
- Choose double end threaded rod from reputable manufacturers to ensure material and heat treatment quality, thus preventing fracture risks from the source;
- Optimize the structure of the double end threaded rod (increase the fillet radius), improve thread machining accuracy, and reduce stress concentration;
- Reduce vibration sources, install damping devices, regularly inspect the fatigue status of the double end threaded rod, and replace aging components promptly.
Note: Regular inspection and maintenance of the double end threaded rod, and strict adherence to installation and usage specifications according to working conditions, can effectively reduce the failure rate and extend the service life of the double end threaded rod. If you have any questions about troubleshooting and resolving failures, it is recommended to contact a professional double end threaded rod manufacturer or technician to avoid secondary damage caused by improper operation.
Post time: Jan-09-2026