October 30, 2007 © SKF Group Slide 1

Dismounting of Bearings

Presented to ELS/CNB

Presented by Mihir Kashyap

29/07/2011

October 30, 2007 © SKF Group Slide 3

Dismounting of Bearings Using heat

1

October 30, 2007 © SKF Group Slide 4

Heaters for (dis)mounting of cylindrical roller bearings

• Aluminum rings TMBR:

• Non-adjustable EAZ induction heater:

• Adjustable EAZ induction heater:

October 30, 2007 © SKF Group Slide 5

2Fixed induction heaters EAZ series

October 30, 2007 © SKF Group Slide 6

Quick roll changes with bearing removal in 3 minutes

 In light section mills and wire rod mills, four-row cylindrical roller bearings are usually used to take up the roll separating forces. The inner rings of these bearings are mounted with an interference fit on the roll necks. Because of the rapid wear, heavy loads and severe contamination the rolls must be frequently replaced. This inevitably involves dismounting the inner rings and remounting them onto new rolls.

 

                                                                     

                                   

October 30, 2007 © SKF Group Slide 7

Three minutes are enough

Using the EAZ, inner rings are heated evenly while the roll neck remains cold. The ring, together with the induction heater, can be easily withdrawn from the neck. Even with relatively large rings this complete operation takes not more than two to three minutes.The induction heater also serves as a mounting tool. Therefore pushing the ring onto the neck virtually becomes a trouble-free project. 

•Reduced time to remove bearings

•Only one person is required

•Increased production time

•Available in different voltage versions

•Bearings can be reused

 

                                                                     

                                   

October 30, 2007 © SKF Group Slide 8

Voltage classificationEach heater is available in three different voltage versions as follows:LV Low 190 to 230VMV Medium 400 to 480VHV High 500 to 575VPlease add the corresponding class as a suffix to the designation when ordering (e.g. EAZ 166 HV).  

 

                                                                     

                                   

Control cabinets

SS 250A 230V, 50Hz, 250A

SS 250B 400V, 50Hz , 250A

SS 250C 460V, 60Hz, 250A

SS 350A 230V, 50Hz, 350A

SS 350B 400V, 50Hz, 350A

SS 350C 460V, 60Hz, 350A

A special control cabinet suitable for handling two heaters at the same time is also available.•SSD 350A230V, 50Hz, 250A (2x)•SSD 350B400V, 50Hz, 250A (2x)•SSD 350C460V, 60Hz, 250A (2x)

October 30, 2007 © SKF Group Slide 9

3Adjustable induction heaters EAZ series

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For frequent dismounting of cylindrical roller bearings

 The adjustable induction heaters EAZ 80/130 and EAZ 130/170 are used for frequent dismounting of cylindrical bearing inner rings.Where inner rings are removed infrequently, aluminium heating rings, TMBR series, are also available.For larger cylindrical inner rings normally found in steel mill applications, SKF can supply special EAZ induction heaters. 

•Covers most cylindrical bearings 65 to 130 mm (2.5 to 5.1 in) bore diameter

•Wide range of power supplies 1 year warranty

•Avoids shaft and bearing inner ring damage

•Fast and reliable bearing removal

•Up to n6 interference fit

 

                                                                     

                                   

October 30, 2007 © SKF Group Slide 11

Ordering details  Power supply CurrentEAZ 80/130A 2 x 230V/50Hz 45 AEAZ 80/130B 2 x 400V/50Hz 25 AEAZ 80/130C 2 x 460V/60Hz 25 AEAZ 80/130D 2 x 415V/50Hz 25 AEAZ 130/170A 2 x 230V/50Hz 60 AEAZ 130/170B 2 x 400V/50Hz 45 AEAZ 130/170D 3 x 230V/50Hz 43 AEAZ 130/170E 3 x 400V/50Hz 32 AEAZ 130/170F 3 x 460V/60Hz 23 AEAZ 130/170G 3 x 420V/60Hz 30 AEAZ 130/170H 3 x 415V/50Hz 30 A

Selection table for bearings NU

EAZ 80/130 EAZ 130/170

213 – 221222 – 228

313 – 320321 – 326

412 – 418419 – 424

1014 – 1022 1024 – 1030

2213 – 2220 2222 – 2228

2313 – 2320 2322 – 2326

All E-types included.

Selection table for bearings NJ-NUPEAZ 80/130 EAZ 130/170213 – 220 222 – 228313 – 319 321 – 324412 – 417 419 – 4221014 – 1022 1024 – 10302213 – 2220 2222 – 22282313 – 2319 2322 – 2324All E-types included.

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Technical data  

EAZ 80/130 EAZ 130/170

Connection 5 m 16 ft 5 m 16 ft

Cable Length

Dimensions

A 285 mm11.2 in 335 mm13.2 in

B 115 mm4.5 in 120 mm4.7 in  C 555 mm21.8 in 630 mm24.8 in  D 305 ... 360 mm 335 ... 380 mm 12.0 ... 14.1 in 13.2 ... 15.0 in  a 134 mm5.3 in 180 mm7.1 in  b 50 mm2.0 in 50 mm2.0 in 

c 35 mm1.4 in 30 mm1.2 in  d 80 ... 132 mm 130 ... 172 mm

3.1... 5.2 in 5.1 ... 6.8 in Weight  28 kg 62 lb 35 kg 77 lb 

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4Aluminum heating rings TMBR series

October 30, 2007 © SKF Group Slide 14

For regular dismounting of cylindrical roller bearings

 The aluminum heating rings are designed for dismounting inner rings of cylindrical roller bearings.

They are available for all bearing sizes of the NU, NJ and NUP series, these are bearings without flanges or with only one flange on the inner ring.

The rings are available as standard for the following bearing sizes:

1. 204 to 252,

2. 304 to 340,

3. 406 to 430. 

• Simple and easy-to-use

• Avoids shaft and bearing inner ring damage

 

                                                                     

                                   

October 30, 2007 © SKF Group Slide 15

Thank You