Norglide Bearings Installation Brochure

"U"75% Lager-nennbreiteFaseDma"U""X""Z""U""U"45¡R ca. R 5 ca. R 10 ca. R 5 ca. R 10< 3,5 + 0,005— 0,005flflfl — 0,1— 0,1RR 1,51,51,5The process described below is somewhat idealized, but includes the most impor-tant steps for installing NORGLIDE¤ bearings into a housing. Whether and in whichorder the individual steps have to be made de-pends on the material type, theapplication and the technical feasibility and should be discussed with our applicati-on engineers.How to insert the bearing into the housing. Using an installation mandrel,guide the bearing or, in the case of bearings installed with a press fit, press in thebearing. By the aid of sizing, increase the bearingÕs inside diameter and form backthe lead-in, if existing. Then form the second flange using the flanging mandrels.Pressing in 1. Sizing and2. SizingPre-flanging Final flangingDetail "U" Detail "X" Detail "Z"R= Material thickness + 0,5R= Material thickness + 0,75Saint-Gobain Performance PlasticsInstallation of NORGLIDE¤ bearingsDesign of toolsInstallation mandrel¥ The diameter Dma should be at least as big as the bearingÕs flange diameter.¥ If needed, half of the pressing-in path has to be supported externally with two shell halves.¥ The transition from guide pin to vertical shaping surface should be sharp-edged.¥ The guide pin length should be equal to at least 75 % of the bearingÕs length.The guide pin should not deform or straighten the bearing lead-in.¥ Detail U shows a correctly dimensioned radius that avoids damage to the bea-ring surface.¥ The diameter of the guide pin should be at least 0.05 mm less than the smallestinside diameter of the installed bearing. The pin must not press the bearing into the housing.Sizing mandrel¥ The sizing mandrel should be suspended on a self-centering device to center it-self.¥ The guide pin should be dimensioned similarly to that of the installation man-drel. Additional tapering may ease lead-in. All transitions should be designed with radii as shown in Detail U.¥ The length of the effective sizing range should not exceed 3.5 mm so that it can work as a forming tool. The radii on the transitions should be as shown in detail X. To prevent damage to the bearing, the sizing mandrel should be hardened andpolished, particularly in the active sizing range.¥ The diameters of detail X are determined as described under ÒDesign of Sizing PinsÒ (page 22).Flanging mandrel¥ Usually flanging is done in two steps: 1st step: 45¡; 2nd step: 90¡. In isolated casesthe 2nd flange can be formed in one step.¥ The guide pin length should be at least as long as the bearingÕs nominal length to avoid deformation of inside diameter.¥ Additional tapering may ease lead-in. All transitions should be designed with radii as shown in Detail U.¥ The transition from guide pin to forming area should be designed with a radius.For the 45¡ flanging mandrel it should be ÒR = material thickness + 0.75 mmÒ; forthe 90¡ flanging mandrel ÒR = material thickness + 0.5 mmÒ. These values are recommended for housings with chamfered or rounded edges. With sharp-edgedhousings, the radii have to be defined.¥ To prevent damage to the bearing, all forming areas should be hardened and polished.¥ To prevent delamination of the flange, avoid inserting the 45… flanging mandrel too deep.¥ Bearings without press fit in the housing have to be used with suitable back-up systems.Saint-Gobain Performance Plastics