Document zq4yDmqZZXKp62xMNxqzvaB7

CUTLER-HAMMER, INC. BUL. 505-506 A.I.S.E. BRAKE WHEELS & LININGS 1 July 10, 1968 NOTICE Certain of the Information contained in this report is the exclusive property of Cutler-Hammer, Incorporated. It is given in confidence and is not to be disclosed to others without express consent of Cutler-Hammer, Incorporated. CfW&- | PLAINTIFFS EXHIBIT * oo J WV-21082 MATERIAL SPECIFICATIONS I. WHEELS 72-46-03 Ductile Iron 72.000 Psi Minimum Tensile strength 46.000 Psi Minimum yield strength 3% elongation in 2" Hardness 192-235 Brinell maximum (3000 Kg Load) Heat treatment - normalized and tempered to required hardness 2. LININGS Folded and compressed impregnated asbestos -"Asbestos yarn with soft non-ferrous wire core, woven into cloth, filled with heat resisting compound, stacked, and finished with pressure and heat. Working face is to be ground." Min. coefficient of friction = .3 Maximum rubbing speed ** 7500 FPM Maximum pressure =* 75 Psi Min. Life - 500,000 foot pounds required to wear .001 cu. inch, when applied intermittently at 60 Psi against a steel wheel with face hardened to Rockwell C40 Min. and operating at 160C and at 3000 FPM rubbing speed. The following manufacturer's types have been found to meet the above specification: Johns-Manville #600 Raybestos - Manhatten #G1000 'Asbestos Mfg. Co. #8266 WHY DUCTILE IRON? 1) Ductile Iron combines the excellent frictional characteristics of cast iron with the high strength of steel, while minimumizing the un desirable properties of both. 2) Ductile iron wheels are not prone to "patch weld" as are steel wheels and can with stand higher temperatures before patch welding will occur. Patch welding i-s a term used to de scribe the condition which occurs when a wheel begins to score and particles of wheel material become imbedded in the friction lining. This imbedded material increases .scoring - and heating - of the wheel so that finally the instantaneous temperatures become so high that the particles weld together into the lining. 3) If a surface crack does develop, ductile iron's molecular structure resists propagation of the crack, in contrast to cast iron and steel, in which, once formed, a crack will continue to enlarge. WHY FOLDED AND COMPRESSED LININGS? 1) This lining material exhibits a constant coefficient of friction over the entire temperature range, and does not "fade" as some other materials do. 2) In over 3 years of testing under varing conditions, this material exhibited the best wear character istics of all the various lining materials avail able. Other lining materials will provide longer life, but only at the expense of rapid wheel wear. FIELD-PROVEN COMBINATION The ductile iron wheels and folded and compressed linings have been proven in over 12 years of steel mill service. Previous designs used cast iron, cast steel and hardened steel, with much less satisfactory performance records.