drylin® is a product range of maintenance-free and lubrication-free linear bearings available in four different type series. In addition the range is complemented by complete linear units with spindle drive or toothed belt. The main benefits in addition to zero maintenance and lubrication are strength and resistance to external influences such as dirt, moisture, chemicals, heat and impact.
Lubrication-free and dirt-repellent
drylin® linear bearing systems are designed for running dry. Your applications are thus protected against contamination through grease and oils. This works well in coarse dirt or even sand. Particles are repelled from the contact surface by the movement itself. Here the front of the sliders works like a wiper. The contact surface remains clean.
Comparison of noise development
Quiet operation is due to the difference between rolling and sliding. There are no loud collisions between a hard steel ball and the shaft or rail. The sliding movement has very low noise so that only the low sliding noise can be heard.
The avoidance of lubricants brings decisive advantages. This makes its use possible with coarse dirt, dust and sand. Dirt and dust particles are pushed away from the contact surface by the movement itself and do not stick due to lubricant. This way materials are spared, downtimes are reduced and costs are saved.
Lubrication-free and clean
Use in wood chips
Extreme application conditions in the offshore industry
The low moisture absorption of iglidur® J, J200 and X permits even underwater applications. The application of stainless steel or anodised aluminium shafts provide for a corrosion-resistant guide system. Anodised aluminium is resistant to chemically neutral substances in the range pH 2 to 7. For special applications separate tests are recommended for coated aluminium sample parts for that specific application.
dryline® linear technology brings even more advantages, which also reduce maintenance and downtime and thus save valuable time and, above all, costs.
Instead of balls (left): lubrication-free plastic glides (right)
drylin® linear bearings operate on sliding pads unlike the traditional recirculating ball bearing systems. This gives a larger contact surface resulting in lower surface pressure. This leads to advantages which include:
The use of non-hardened shafts
Even non-metallic counter partners can be used
To be eaten away is completely impossible
Filling machine, Krones AG, Rosenheim
iglidur® J is resistant to weak acids, diluted alkalis as well as to fuels and all kinds of lubricants. The intensive cleaning of machines with standard commercial cleaning agents, even in the food sector, is therefore not a problem for the guides. For applications in environments with aggressive chemicals, the use of the drylin® R bearings equipped with iglidur® X liners is recommended. The resistance of linear bearing systems is equally dependent on the shaft or rail material. As a chemically resistant partner, a high-alloyed stainless steel is offered, for instance high grade steel (1.4112), or alternatively the use of soft VA steels (e.g. 1.4571).
The large surface area of drylin® linear plain bearings, when compared to traditional ball bearings, means that under a given load the bearing pressure is greatly reduced. This allows soft shaft materials to be used, including hard anodised aluminium, which in turn gives additional benefits in friction and wear rate values. Also VA stainless steel shafts can be used when chemical resistance is required. Of course, standard linear hardened shafts can also be used with drylin® linear bearings.
The line up of guide rails (joining) poses no challenge for drylin® linear guides. The guide rails are slightly chamfered, aligned and simply placed behind each other. The groove resulting from the joint can be passed over by the sliding element without problems. With the drylin® linear plain bearings, a ball or roller cannot get stuck. In this way stroke lengths of more than 20 meters can be implemented. Assembly is simplified by the distinctive joint marking provided at the factory.
High speeds and accelerations drylin® linear plain bearings do without rollers and balls. This makes the bearing independent of the mass inertia of this body and can be used with high speeds up to 10 m/s and accelerations up to 100 G. drylin® linear bearings are therefore especially suitable for applications with light loads, where the speeds should be increased. The use of hard-anodised aluminium as a friction partner lowers the operating temperature in the bearing due to the high thermal conductivity of aluminium. Thus the operation can be carried out with a high frequency even at very short stroke lengths. The maximum average surface speed results from the load on the bearings. With decreasing surface load, higher speeds can be achieved. More important than the maximum speed reached is the average speed over a period of time, because this has the most influence on the heating of the bearing system. In cases with breaks between the individual cycles, the maximum average surface speed is critical, which is achieved during a period of 10 to 30 minutes.
The iglidur® X material in heavy-duty use under high temperatures in foundries
Sliding elements made from iglidur® J and J200 can be used in the temperature range between -40 and +90°C. Plain bearings with higher precision classes can have alternative temperature ranges, please refer to the respective product page. In applications with aluminium shafts and/or rails, distinctly higher loads and speeds can be attained due to the excellent thermal conductivity. Sliding elements made from iglidur® X can be used in the range of –100°C to +250°C.
Hard anodised surfaces are characterised by good wear properties, high chemical resistance and a high degree of hardness. It is a technical and not a decorative surface. Colour alteration and slight cracking may occur, but do not influence the resistance, the corrosion behaviour or the bearing properties. Cutting surfaces and machined surfaces are uncoated.