Tender for De-Shelling and Re-Shelling and shelling after machining of Mill rollers.

De-Shelling & Re-Shelling of Mills rollers (Conventional type)

De-Shelling & Re-Shelling of Mills rollers (Semi Couch Type) Size 825 x 1525 mm Material should be coarse grain cast Iron having hardness 180 to 210 BHN. Confirming to IS 11201-1985 As per below given material Composition:- i) Carbon 3.2% to 3.6% ii) Magneese 1% to 1.5% iii) Silicon 1.2% to 2.2% iv) Phasphorous 0.5% Maximum. v) Sulphur 0.15% Maximum. Duly machined and grooved as per drg No. The checking of crcak/ defect of shaft has to done with Ultrasonic testing of the shaft before casting of each roller and same ultrasonic test report of the shaft has also to be sent to Palwal Sugar Mill. Note:-1. C.I material composition test report should be sent with roller. 2.Guarantee for any casting/ manufacturing defect would be one crushing season after fitted in headstock or 18months from date of receipt of roller in Palwal Mill. Note:-1. C.I material composition test report should be sent with roller. 2.Guarantee for any casting/ manufacturing defect would be one crushing season after fitted in headstock or 18 months from date of receipt of roller in Palwal Mill.

Supply of Mill roller consisting of complete machined shaft with shrink fitted C.I shell i.e. complete in all aspects for our mill house with following specifications:- Size of Shaft-OD-445 mm x Length-3550 mm As per Drg No. 187/93 Forged steel shaft Material= 40C8 Tensile strength, 58 kg/mm² Elongnation-16 to 33% Forged Reduction % to 1/3% Hardness 150 to 165 ΒΗΝ. Chemical Composition:- i) Carbon -0.256 to 0.35% ii) Magnessia-0.61 to 1.00% iii)Silcon -0.35 to 0.5% iv) Phosphorous 0.25% Maximum v)Sulphur -0.25% Max. Along with material test certificate and Ultrasonic test report is required. Confirming to JS 1570-1979. Specification of shrink fitted C.I Shell- OD=825 MM. Length = 1525 MM Material should be coarse grain cast Iron having hardness 180 to 210 BHN. Confirming to IS 11201-1985 duly machined and grooved. The crack defects of shaft are to be checked by ultrasonic test of each shaft before casting of C.I Shell and also to be send to the Palwal Sugar Mill. Ultrasonic test report guarantee for any Mfg. defect will be one crushing season. As per given below material composition of cast Iron shell:- Carbon:- 3.2% to 3.6% Magnesia:- 1% to 1.5% Silicon:-1.2% to 2.2% Phosphorous:- 0.5% Maximum Sulphur:- 0.5% Max. Note:- Material composition test report will be provided by the party & guarantee for any Manufacturing defect will be one full crushing season.