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Step-down shafts forging


Technolit Int. forges step-down shafts.

The maximum size of a step-down shaft is the same as that of a single-diameter shaft or an axle, i.e. up to 400 mm (15.748 in) in diameter, up to 3000 mm (118.11 in) of height and 1500 kg (3306.9 lbs) of weight.

Step-down shafts forging  Technolit Int.

Steel grades used in the forging of the step-down shafts are equal to the steels used for the single-diameter shafts and axles, to wit: 45, 20, 35, 40, 40, 402, 42, 121810 and others.

The cutting of the blanks is the initial stage of the forging. The blanks are cut either by a BAND SAW or a FLAME cutter depending on the intensity of the equipment use. Technolit Int. operates two types of band saws: MYT-1 (for the processing of blanks of the maximum diameter 400 mm (15.748 in)) and MYT-2 (for the processing of blanks of the maximum diameter (23.622 in)).

The temperature of step-down shaft forging depends on the blank steel grade. For example, the steel grade 20 is heated to 1200 +50 C (2192 -122 F). The forging temperature for the blanks of this steel grade ranges from 1250 -50 C to 750 +50 C (2282 -122 F to 1382 +122 F).

The forging of parts is carried out, depending on a blank weight, by a steam-air hammer with the weight of the falling part of 1, 2 or 3 metric tons (0.9842, 1.9684, 2.9526 long tons or 2204.6, 4409.2, 6613.8 lbs).

The forging (of the step-down shaft) is a time-consuming process since the part has a complex configuration; the craftsman needs to ensure accuracy and trim the required length and get the desired diameter.

Heat treatment of a step-down shaft is the pre-finishing stage of forging. Depending on the steel grade NORMALIZING or ANNEALING shall be applied for the heat treatment.

The turnaround time depends on the amount of blanks to be manufactured (forged) and the specification complexity.

At the final stage the Quality Control Department accepts the works completed. All blanks are subject to allowances according to GOST 8479-70.



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