Maintenance points of the linear guide
First, daily cleaning and pollutant protection
Surface cleaning frequency
daily before running with a dust-free cloth or soft brush to remove dust, metal shavings, oil and other pollutants on the surface of the guide rail and the grooves of the slider, to avoid wear and tear of the raceway by foreign objects.
Example: Linear guideways in machining centers that accumulate iron filings may cause the slider to jam or lose accuracy.
Protective device inspection
Regularly check whether the dust cover and chip scraper plate (such as labyrinth seal and rubber strip) are broken, and replace the aging parts in time to prevent the intrusion of cutting fluid and cutting dust.
Second, the core points of lubrication management
Lubrication method and period
| Application scenarios | Type of lubrication | cycle | Precautions |
| Normal working conditions (light load / low speed) | Lithium grease (NLGI 2) | Every 100-200 hours of operation | Use a grease gun to evenly apply to the inside of the rails, raceways and sliders |
| High-speed / heavy-duty service | Lubricating oil (ISO VG 32-68) | Every 50-100 hours of operation | Automatic oil supply system (e.g. grease nipple dripping) |
| Clean Environment (Semiconductor/Medical) | Food grade grease or white oil | 1 time per week | Avoid contamination of the product with ordinary greases |
Lubricant quantity control
Excessive lubrication is easy to adsorb dust, and too little will increase the wear and tear; it is recommended to calculate according to the size of the slider: apply about 0.5-1g of grease for every 100mm length of the guideway.
Precision Calibration and Gap Adjustment
Straightness and Parallelism Detection
The straightness of the guideway is detected monthly with a percentage meter (allowable deviation ≤ 0.05mm/1000mm), if it exceeds, it needs to be calibrated by adjusting the mounting bolts (tightened in diagonal order) or shims.
When multiple guide rails are parallel, calibrate the parallelism with laser interferometer (deviation ≤ 0.03mm/1000mm) to avoid jamming of the slider operation.
Preload and clearance check
Push the slider manually to feel whether the resistance is even: if too loose (large clearance), replace the worn ball/roller; if too tight, the preload may be too large, resulting in heat generation, and the slider preload needs to be adjusted (some models can be adjusted by the eccentric sleeve).
Wear monitoring of key components
Judgment of ball/roller wear
Disassemble the slider and observe the surface of the ball: if there are pits, rust stains, or glossiness decreases, it is necessary to replace the slider assembly as a whole; if there are scratches on the guideway (depth>0.1mm), it is necessary to grind and repair or replace the guideway.
Five, special working conditions to cope with the strategy of
high-temperature environment
over 80 ° C to use high-temperature grease (such as molybdenum disulfide grease), and increase the cooling device (fan or water-cooled plate), to avoid thermal deformation of the guide.
Corrosive environments
Choose stainless steel rails (e.g. SUS304) or hard chrome plated coatings, wipe with a neutral cleaner and apply anti-corrosion oil after each use.
Vacuum / dust-free environment
Use self-lubricating guide rail (built-in solid lubricant), prohibit the use of ordinary grease to avoid volatile contamination; regularly clean the surface with dust-free alcohol.
Six, maintenance records and failure warning
Establish maintenance ledger
to record the time and parameters of each cleaning, lubrication and calibration (e.g., grease type, bolt torque), so that it is easy to trace the cause of abnormality.
Abnormal phenomenon processing
found the following conditions immediately shut down for maintenance:
abnormal noise during operation (possible ball breakage);
slide temperature is too high (> 60 ℃, may be insufficient lubrication or preload force is too large);
movement accuracy suddenly decreased (deviation > 0.1mm).
Seven, to extend the life of the advanced recommendations
Spare guide storage: not installed guide should be coated with anti-rust oil, wrapped in moisture-proof paper, stored vertically to avoid deformation;
Preventive Replacement: According to the length of operation (such as 8 hours a day, the proposed 3-5 years to replace) or trip (cumulative operation after 1000km) in advance to replace wearing parts, reduce the risk of sudden failure.
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