Dual-axis linear guides are a type of roller linear guide. Unlike ball bearing linear guides where the balls directly contact the guide surface, dual-axis linear guides mount the balls inside small, sealed rollers, with the contact occurring between the small rollers and the guide surface. Currently, dual-axis linear guides are increasingly widely used across various industries, playing a crucial role in the development of automation. So, what are the most prominent features of dual-axis linear guides?
I. The dual-axis linear guide uses aluminum profiles as the main material.
Most linear guides on the market are made of iron because they are wear-resistant, have a high load-bearing capacity, and are not easily deformed. However, their disadvantages are heavy weight and poor corrosion resistance. Dual-axis linear guides, on the other hand, use aluminum profiles as their main material. Their advantages are that they overcome the disadvantages of iron guides—lightweight and corrosion-resistant—while their disadvantages are also the advantages of iron guides: weaker load-bearing capacity and susceptibility to wear and deformation. However, the slider of a dual-axis linear guide does not directly contact the aluminum profile guide, thus effectively avoiding the disadvantage of aluminum's softness.
II. Dual-axis linear guide rails using U-shaped roller bearings
The U-shaped rollers used in dual-axis linear guides are made of bearing steel with a surface hardening treatment, achieving a hardness of 62HRC and extremely high wear resistance. The balls are installed inside the rollers, filled with high-quality grease and sealed, allowing the rollers to be maintenance-free for their entire lifespan. The rollers also feature a U-shaped groove design that perfectly integrates with the cylindrical steel shaft of the dual-axis linear guide. The advantages of using U-shaped rollers are threefold: first, the balls are sealed, preventing contact with external air and dust, allowing use in dusty and debris-rich environments; second, no lubricating oil needs to be added during use, achieving maintenance-free operation and saving on maintenance and upkeep costs; and third, during operation, the rollers have line contact with the cylindrical steel shaft, resulting in a low coefficient of friction and strong heat dissipation, making high-speed operation feasible.
3. The dual-axis linear guide uses high-hardness steel shafts.
In a dual-axis linear guide, the rollers within the slider contact the steel shafts during operation. These steel shafts are embedded inside or outside the guide rail on both sides, hence the name "dual-axis linear guide." Don't underestimate these two steel shafts; like the rollers, they undergo surface hardening to a hardness of 62 HRC. This ensures that direct contact between the rollers and the guide rail is avoided during operation, compensating for the relatively soft and easily worn nature of aluminum profiles. Furthermore, the surface-hardened rollers and steel shafts are more wear-resistant, resulting in a longer service life.
In summary, the use of aluminum profiles, roller bearings, and steel shafts in dual-axis linear guides overcomes the disadvantages of iron linear guides, such as heavy weight, susceptibility to corrosion, and harsh operating environments. It combines the advantages of iron guides with the inherent advantages of aluminum profiles. Of course, load is unavoidable with dual-axis linear guides; therefore, if the load is within 50KG, dual-axis linear guides can be considered.
