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BEARING INDUSTRY L Bearing balls and rollers A Company within the SWAROVSKI Group

BEARING RINGS TYPICAL GRINDING APPLICATIONS Face grinding. inner- and outer rings Centerless grinding, Race grinding. outer rings outer rings BEARING TYPES Ball bearing Angular contact bearing Taper roller bearing Cylindrical roller bearing Spherical roller bearing Trust bearing Special types: - Large size bearings

BEARING BALLS AND ROLLERS TYPICAL GRINDING APPLICATIONS Ball grinding Centerless grinding. cylindrical and taper rollers Centerless grinding. spherical rollers Face grinding. cylindrical and spherical rollers Face grinding. taper rollers Face grinding taper rollers cylindrical and taper rollers spherical rollers BALL AND ROLLER TYPES Taper roller Spherical roller Cylindrical roller

FAcE GRINDING of inner- and ouTer rings After hardening, inner- and outer rings have to be ground parallel to the final dimension and quality. machine This is usually done in a double disc grinding machine, which offers a very efficient way to produce good quality and high output. The rings are either feed in one or more passes by a rotary or straight feeding device or by the plunge grinding principle. Rotary through-feed Plunge grinding For special requirements, also face lapping machines are used, which are mostly equipped with vitrified bonded CBN wheels. Straight through-feed Double...

CENTERLESS GRINDING □ F OUTER RINGS AND SHAFTS This is the following Operation after the face grinding for outer rings. The ovality and wave from the hardening process has to be reduced to low tolerances by this Centerless through-feed grinders can do this in a very efficient way. For profiled water pump shafts and large rings, centerless plunge grinders are also used. Control wheel Grinding wheel Through-feed grinding of rings Specials: wheel set with combination of vitrified and resin bonds Plunge grinding of bearing shafts Specials: sintered A/O vitrified bonded for high demands on...

RACE GRINDING □ F INNER- AND OUTER RINGS According to the bearing type, the race ways have different profiles, which are usually pre-shaped by turning. The race grinding Operation has to meet the quality requirements specified for roundness, wave, form- and dimensional tolerances. External- and internal grinders, the rings are usually supported by shoes and driven by a magnetic chuck or pressure plate. Different infeed Steps (roughing, finishing and spark out) are used for grinding. Inner ring ball track Inner ring track and rib Outer ring ball track Outer ring fiange Inner ring race and...

RACE GRINDING CBN vitrified bonded for steel materials - Diamond vitrified bonded for ceramic materials - Elastic bonded wheels for fine surface finish GRINDING TOOLS Grinding wheel type 1LB Special design: - All different types of profiles Grinding of spherical outer rings Outer ring flange grinding (CRB) _ Sulphur impregnation for longer dressing cycles - CBN resin bonded for steel materials L Diamond resin bonded for ceramic materials GRINDING TOOLS

BORE GRINDING The bore grinding Operation is done in the same way for most bearing types. The bore has to be ground concentric and perfectly straight to the profile of the inner ring track. Internal grinder, the rings are usually supported by shoes and driven by a magnetic chuck or pressure plate. Different infeed Steps (roughing, finishing and spark out) are used with small oscillation. Bore grinding Bore grinding of inner rings Diamond resin bonded for ceramic materials Sulphur impregnation for longer dressing cycles GRINDING TOOLS Grinding wheel type 1 Special design: r- Type 5 with...

□ F INNER- AND OUTER RINGS The superfinishing is the final Operation for bearing races. All qualities like roundness, wave, form and surface finish have to meet low tolerances. Superfinishing machines, the rings are usually supported and driven by steel rolls. It can be done with one or more stations and Steps (roughing and finishing). The stone oscillates across the race. Outer ring ball track Inner ring ball track Outer ring taper roller track r- Paraffin or sulphur impregnation for higher material removal rates GRINDING TOOLS Superfinishing stone type 54SCH Special design: r With profile...

BALL GRINDING The high forces applied in the machine require extremely hard grinding wheels, which are made in a special production technology. This regards both, the vitrified and the resin bonded wheels. Ball grinding is done in specially designed machines with horizontal or vertical axis. The balls are ground between a grooved plate and the grinding wheel. The stationary grooved plate is made of cast steel in different hardness according to the application. It has a section cut out of it; this is where the balls enter and exit the grooves.The grinding wheel spins, while the balls travel...

CENTERLESS GRINDING This is the next step after the face grinding for cylindrical- and spherical rollers (the first step fortaper rollers). The ovality and wave from the hardening process has to be reduced to low tolerances by this process. Centerless through-feed grinders are used for cylindrical and taper rollers. Taper rollers are transported by a profiled steel drum as control wheel. For spherical rollers, centerless plunge grinders are used. Through-feed grinding of cylindrical rollers Plunge grinding. spherical rollers Through-feed grinding. taper rollers r- CBN vitrified and resin...

FACE GRINDING The face grinding is the first Operation after hardening. The rollers are ground parallel to the final dimension and quality. This is usually done in a double disc grinder in mostly one pass. For larger rollers or small series, grinders with cup wheels or grinding rings are used. Double disc grinding, cylindrical or spherical rollers Double disc face grinding of cylindrical and spherical rollers r- Vitrified bonded wheels L- CBN vitrified and resin bonded

FAcE GRINDING of Taper rollers The face grinding is done after the centerless grinding. machine Specially made machinery is used. The grinding tool is a cup wheel, grinding ring or a profiled external grinding wheel. Grinding with cup wheel, taper rollers Grinding with profiled external grinding wheel, taper rollers face grinding of taper rollers Product Benefits A/O resin bonded high output, good surface quality W D Specials: Multiple layer wheels for roughing and finishing D W H D D T H T T T D D grinding Tools T cup wheel type 5ST Special design: Modler type wheel with two layers...