How to avoid the friction of linear guide
The friction of linear guide mainly originates from the contact between rolling body and raceway, the intrusion of pollutants and installation stress, etc. Through targeted measures can significantly reduce the coefficient of friction, reduce wear and energy consumption.
First, optimize the lubrication system
match the lubrication medium: according to the working conditions to choose grease or lubricant. Low-speed heavy-duty scenarios with high viscosity grease, the formation of a thick film to reduce direct metal contact; high-speed scenarios with low-viscosity lubricant or oil-air lubrication, reduce the mixing resistance. Lubrication media containing solid lubricants (e.g. molybdenum disulfide) can maintain lubrication in extreme environments. Control lubrication quantity and period: A single lubrication quantity is appropriate to cover the contact area between the rolling element and the raceway, as excessive quantity will result in increased resistance. Regular replenishment according to the operating time (usually 500-1000 hours), to avoid grease aging or drying out friction increased.
Second, improve the structure and materials
Optimization of contact parameters: rolling body and raceway contact angle adjusted according to the type of load, to ensure that the stress is uniformly distributed; raceway radius of curvature is set to 52% -53% of the diameter of the rolling body to increase the contact area to reduce the unit pressure, reduce friction and wear.
Choose low-friction materials: rolling body using ceramics (such as silicon nitride), its coefficient of friction is 20% -30% lower than steel; guideway surface chrome plating or spray diamond-like coating (DLC), reduce surface roughness, reduce friction resistance.
Section. Precise installation and calibration
Control of installation accuracy: ensure that the parallelism error between the guide rail and the installation base surface is ≤0.01mm/m, to avoid friction due to tilting resulting in off-loading of the rolling body. The slider and table connection adopts floating structure to offset the additional torque generated by the installation error.
Reasonable preload: Eliminate the gap by preloading, preload 10%-15% of the rated load, to avoid the impact of friction in reverse motion, but to prevent the preload is too large to cause friction resistance rise.
Fourth, isolate the pollutants
Add protection device: adopt telescopic shield, chip scraper or sealing ring to intercept the dust, cutting fluid and other impurities. The lip of the chip scraper fits tightly with the guide rail, which can remove the tiny particles attached to the surface and avoid the friction of abrasive particles. Keeping the environment clean: In scenes such as optical instruments and semiconductor equipment, a clean room environment (dust concentration ≤ 0.1μm/m³) is used to reduce the chance of pollutant intrusion.
Five. Operation status monitoring
Dynamic parameter tracking
Monitor the real-time current change of the drive motor with the help of current sensor (current is positively correlated with running resistance), or record the speed fluctuation of the slider movement through displacement sensor. When the current exceeds 15% of the reference value and the speed fluctuation exceeds ±5%, it triggers the early warning mechanism, prompting the inspection of the grease condition (whether it is dry or emulsified) or whether there is any foreign matter attached to the surface of the guide rail, so as to prevent the friction from increasing continuously.
Periodic Maintenance Plan
Formulate the maintenance cycle according to the mileage (e.g., every 500km) or time (e.g., every 800 hours), dismantle the end cover of the slider, use special cleaning agent (e.g., isopropyl alcohol) to rinse the internal raceway and rolling body, remove the abrasive debris (particles with a particle size of ≥ 10μm will cause the coefficient of friction to increase by 40%), and then evenly apply new grease (e.g., isopropyl alcohol), and then leave it to dry. After drying, evenly apply new grease (filling amount 1/3 of the internal space of the slider) to restore the low friction state of the rolling contact surfaces. Through the combination of dynamic monitoring and regular maintenance, the coefficient of friction can be stabilized in the range of 0.001-0.0025, which extends the service life of the guideway by more than 60% compared with the unmonitored condition, and at the same time, reduces the probability of equipment downtime due to friction abnormalities.
Contact Us
📞 Phone: +86-8613116375959
📧 E-mail: 741097243@qq.com
🌐 Official website: https://www.automation-js.com/
