What Are The Common Faults, Wear Causes And Maintenance Methods of Trapezoidal Lead Screws?

The common faults, wear causes and maintenance methods of trapezoidal screw drives are as follows:

1. Common faults

Unstable transmission: manifested as unstable movement, shaking or jamming, which may be caused by wear, increased clearance or installation deviation.

Reduced positioning accuracy: repeated positioning errors exceed the tolerance range, affecting the equipment's accuracy, often due to excessive axial clearance or insufficient preload.

Noise and vibration: abnormal noise or obvious vibration during operation, mostly caused by poor lubrication, sudden load change or resonance.

Stuck or poor movement: difficulty in screw rotation, large local resistance, possibly due to foreign objects entering, screw bending or malfunction of the mating components.

High temperature rise: abnormal increase in surface temperature, accompanied by lubricant coking, usually caused by excessive preload, high-speed operation or poor heat dissipation.

2. Wear causes

Insufficient lubrication: lack of regular lubrication or improper selection of lubricants, resulting in increased friction and accelerated wear.

Excessive load: exceeding the rated load of the screw, causing excessive pressure on the threads and triggering wear or deformation.

Installation deviation: misalignment between the screw and the nut, guide rail, or unstable installation, leading to concentrated local stress and accelerated wear.

Foreign object intrusion: dust, chips, etc. entering the thread gap, scratching the thread surface and reducing transmission efficiency.

Material issues: insufficient hardness of the screw or nut material, improper heat treatment, resulting in poor wear resistance and easy wear.

Impact load: collision or impact during installation or operation, causing thread damage or deformation.

3. Maintenance methods

Regular lubrication: add calcium-based grease or special lubricants every 1-3 months, ensuring uniform coverage of the threads.

Cleaning and maintenance: clean the screw surface with kerosene or special cleaners regularly, removing dust, oil stains and foreign objects, and install a dust cover or scraper.

Check installation: use a micrometer to calibrate the parallelism between the screw and the guide rail, ensuring installation accuracy, and check if the coupling and bearing seat are loose.

Adjust preload: adjust the preload through a double nut structure or spacers to eliminate axial clearance and restore transmission accuracy.

Monitor load and temperature: avoid overloading operation, install temperature sensors or current sensors to monitor load and temperature rise in real time.

Regular replacement of worn parts: check the diameter of the screw, the inner diameter of the nut and the clearance of the bearing every half a year to one year. Replace when the wear exceeds the tolerance range.

Environmental protection: in dusty, humid or corrosive environments, use stainless steel or chrome-plated screws, and install a fully enclosed protective cover. Through regular maintenance and correct operation, the service life of trapezoidal screw drives can be effectively extended, ensuring transmission accuracy and stability.

Feel free to contact us for more information!