Technical Information

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1 Technical Information TI No. WL 80-9 E November 2000 Rolling earings FAG Heating Rings Uncomplicated devices for extracting cylindrical roller bearing inner rings

2 Application escription Handling Application FAG heating rings are suitable for dismounting the lipless inner rings of cylindrical roller bearings and needle roller bearings and for inner rings with a fixed lip. The heating rings are ideal for the occasional extraction of small and medium-size bearing rings (bore diameters ranging from 50 to 200 mm). epending on the ring size, the heating process takes 5 to 30 seconds. escription FAG heating rings are slotted rings that are made of a light metal alloy. Their bore diameters and widths must correspond to those of the inner rings to be extracted. Several slots in the circumference of the heating ring reduce its rigidity and thus enable a close fit on the bearing ring. Heatinsulated handles make handling of the rings easier. ue to the good heat-conducting properties of the heating ring the bearing ring quickly takes on the temperature required for extraction (80 to 120 C). The specific heat of the light metal alloy is twice the specific heat of steel, entailing due to the good thermal conductivity of the alloy - only a minor temperature loss with major heat emission. Since the alloy s coefficient of thermal expansion is twice as high as that of steel, the contact between inner ring and heating ring is improved, and the transmission of heat is intensified when the heating ring cools down and the inner ring is heated. Handling The heating ring is heated to 200 to 300 C by means of an electric heating plate. The temperature at the bore must be checked constantly. The bore diameter design ensures that the heating ring sits on the bearing ring with a slight interference fit at 200 to 300 C. The heating ring must be pushed onto the bearing ring (wearing heat-insulated gloves) and clamped by means of the handles. To improve the exchange of heat, the inner ring raceway may be coated with silicone oil before pushing on the heating ring. The clamped heating ring has to be rotated to check if the interference fit of the bearing ring has been eliminated; then the heating ring can be withdrawn from the shaft together with the bearing ring. The extracted inner ring must be removed from the heating ring immediately to prevent it from being excessively heated. Problems may arise with fretting corrosion or cold weldings in the inner ring seat. In such cases the temperature difference 20 C C C 1 FAG

3 Handling Comparison with other extraction tools Programme Information for an Offer Manufacture Accessories Examples of How to Order between bearing ring and shaft generated by the heating ring may not suffice to extract the bearing ring, and the inner ring must be heated by means of an annular burner (see FAG Publ. No. WL Mounting and ismounting of Rolling earings ). Frequent use of the heating ring may affect its roundness so that the exchange of heat is reduced to such an extent that the inner ring cannot be extracted. Two or more bearing rings shrunk onto the shaft side by side cannot be dismounted simultaneously with one heating ring. The bearing rings must be heated one by one and extracted separately. Comparison with Other Extraction Tools We recommend to use the heating rings for cases where a small number of cylindrical roller bearing inner rings with bore diameters up to ca. 200 mm have to be dismounted infrequently. For this particular application, the low purchase price of the heating rings yields real savings. With larger bearing rings, the heating ring-related expenditure gets relatively high. For these cases an annular burner (see Publ. No. WL ) is more cost-efficient. If fast dismounting is required, we recommend to use induction heating for rings with bore diameters of 100 mm and larger. Small bearing rings with bore diameters of up to about 100 mm are usually dismounted by means of mechanical extraction tools (see also TI No. WL 80-48). Programme, Information for an Offer The dimensional tables in this TI list FAG heating rings for the commonly used cylindrical roller bearing inner rings with bore diameters ranging from 50 to 200 mm. On request we also supply heating rings in other dimensions. To prepare an offer we need the following information: earing code or dimensions of the inner rings Shaft fits rawing of the mounting location Approximate number of parts to be extracted per day Manufacture In some cases, customers want to manufacture the heating rings themselves. We recommend to make the heating rings of a heat-resistant aluminium alloy, e.g. AlCuMgPbF38 (material no. WST ). The dimensions of the heating rings for commonly used cylindrical roller bearing inner rings are indicated in this TI. The bore of the heating ring is machined to a Z10 fit corresponding to the inner ring raceway diameter. The handles should be made of round bar steel, with a diameter of 8 to 16 mm and a length of 150 to 200 mm, depending on the ring size. The handles must be heat-insulated. The number of slots in the circumference is determined by the outside diameter of the heating ring. We recommend: up to 200 mm 4 slots from 200 to 300 mm 6 slots over 300 mm 10 slots The depth of the slots should be at least 2/3 of the ring cross section. Recommended FAG Accessories Electric heating plate Order designation: HEIZPLATTE2 Temperature measuring instrument Order designation: TEMP.MG Gloves Order designation: HANSCHUH2 Examples of How to Order FAG Heating Rings AWR NU312E (for inner ring of a cylindrical roller bearing NU312E) AWR NJ2317E (for inner ring of a cylindrical roller bearing NJ2317E) Heating rings for special bearings are also suffixed with the bearing code, i.e. with a number beginning with 5 or 8. AWR (for inner ring of an FAG cylindrical roller bearing ) FAG 2

4 Tables 3 FAG

5 FAG Heating Rings x F Z10 bn L Number of slots, see page 2 for NU earing Heating ring bore Code imensions F d 1 n b n L x mm FAG mm 50 AWR NU210E AWR NJ210E AWR NU2210E AWR NJ2210E AWR NU310E AWR NJ310E AWR NU2310E AWR NJ2310E AWR NU AWR NJ AWR NU211E AWR NJ211E AWR NU2211E AWR NJ2211E AWR NU311E AWR NJ311E AWR NU2311E AWR NJ2311E AWR NU AWR NJ AWR NU212E AWR NJ212E AWR NU2212E AWR NJ2212E AWR NU312E AWR NJ312E AWR NU2312E AWR NJ2312E AWR NU AWR NJ AWR NU213E AWR NJ213E AWR NU2213E AWR NJ2213E AWR NU313E AWR NJ313E AWR NU2313E AWR NJ2313E AWR NU AWR NJ FAG 4

6 FAG Heating Rings n x F Z10 d 1 bn L Number of slots, see page 2 for NJ earing Heating ring bore Code imensions F d 1 n b n L x mm FAG mm 70 AWR NU214E AWR NJ214E AWR NU2214E AWR NJ2214E AWR NU314E AWR NJ314E AWR NU2314E AWR NJ2314E AWR NU AWR NJ AWR NU215E AWR NJ215E AWR NU2215E AWR NJ2215E AWR NU315E AWR NJ315E AWR NU2315E AWR NJ2315E AWR NU AWR NJ AWR NU216E AWR NJ216E AWR NU2216E AWR NJ2216E AWR NU316E AWR NJ316E AWR NU2316E AWR NJ2316E AWR NU AWR NJ AWR NU217E AWR NJ217E AWR NU2217E AWR NJ2217E AWR NU317E AWR NJ317E AWR NU2317E AWR NJ2317E AWR NU AWR NJ FAG

7 FAG Heating Rings x F Z10 bn L Number of slots, see page 2 for NU earing Heating ring bore Code imensions F d 1 n b n L x mm FAG mm 90 AWR NU218E AWR NJ218E AWR NU2218E AWR NJ2218E AWR NU318E AWR NJ318E AWR NU2318E AWR NJ2318E AWR NU AWR NJ AWR NU219E AWR NJ219E AWR NU2219E AWR NJ2219E AWR NU319E AWR NJ319E AWR NU2319E AWR NJ2319E AWR NU220E AWR NJ220E AWR NU2220E AWR NJ2220E AWR NU320E AWR NJ320E AWR NU2320E AWR NJ2320E AWR NU221E AWR NJ221E AWR NU321E AWR NJ321E AWR NU222E AWR NJ222E AWR NU2222E AWR NJ2222E AWR NU322E AWR NJ322E AWR NU2322E AWR NJ2322E FAG 6

8 FAG Heating Rings n x F Z10 d 1 bn L Number of slots, see page 2 for NJ earing Heating ring bore Code imensions F d 1 n b n L x mm FAG mm 120 AWR NU224E AWR NJ224E AWR NU2224E AWR NJ2224E AWR NU324E AWR NJ324E AWR NU2324E AWR NJ2324E AWR NU226E AWR NJ226E AWR NU2226E AWR NJ2226E AWR NU326E AWR NJ326E AWR NU2326E AWR NJ2326E AWR NU228E AWR NJ228E AWR NU2228E AWR NJ2228E AWR NU328E AWR NJ328E AWR NU2328E AWR NJ2328E AWR NU230E AWR NJ230E AWR NU2230E AWR NJ2230E AWR NU330E AWR NJ330E AWR NU2330E AWR NJ2330E AWR NU232E AWR NJ232E AWR NU2232E AWR NJ2232E AWR NU332E AWR NJ332E AWR NU2332E AWR NJ2332E FAG

9 FAG Heating Rings n x F Z10 F Z10 d 1 bn L Number of slots, see page 2 for NU for NJ earing Heating ring bore Code imensions F d 1 n b n L x mm FAG mm 170 AWR NU234E AWR NJ234E AWR NU2234E AWR NJ2234E AWR NU334E AWR NJ334E AWR NU2334EX AWR NJ2334EX AWR NU236E AWR NJ236E AWR NU2236E AWR NJ2236E AWR NU336E AWR NJ336E AWR NU2336EX AWR NJ2336EX AWR NU238E AWR NJ238E AWR NU2238E AWR NJ2238E AWR NU338E AWR NU2338EX AWR NJ2338EX AWR NU240E AWR NJ240E AWR NU2240E AWR NJ2240E AWR NU340E AWR NJ340E AWR NU2340EX AWR NJ2340EX FAG 8

10 FAG OEM und Handel AG A Company of the FAG Kugelfischer Group P.O. ox Schweinfurt Georg-Schäfer-Straße Schweinfurt Tel Fax FAG Heating Rings Every care has been taken to ensure the correctness of the information contained in this publication buo liability can be accepted for any errors or omissions. We reserve the right to make changes in the interest of technical progress. by FAG 2000 This publication or parts thereof may not be reproduced without our permission. TI No. WL 80-9 E/99/11/00 Printed in Germany by Weppert GmbH & Co. KG, Schweinfurt

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