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In the whole forming process of shaft forgings, only by applying the new forging technology theory and technical optimization and combination, can the deformation mechanism of each stage get the best coordination. The gist of it is:
At each moment of forging deformation, the internal tensile stress should be avoided or reduced, and the occurrence of two-direction tensile stress should be eliminated.
Give priority to in order to break the casting organization in deformation stage, can use cone plate forging thick add new FM forging method (both with anvil width ratio of W/H control blank deformation zone center axial tensile stress, and the materials blank width ratio B/H control center does not appear on the transverse tensile stress, deformation area with ordinary flat anvil forging method at the same time with big platform) or LZ forging method (and wide material ratio B/H and the anvil width ratio of W/H control the internal quality of forgings flat anvil long pull process) long.
In the deformation stage where the internal pores are mainly welded, it should be completed in one drawing. New FM forging method or LZ forging method can be used for drawing, and JTS method can be added in the middle. Roughing deformation of plate after JTS compaction is not allowed.
LZ forging method should be selected to check the length drawing method. If the width ratio of the anvil W/H is small enough to meet the requirements, the new FM forging method should be selected. Whether the LZ forging method is chosen or the new FM forging method is applied, the reasonable matching of the anvil width ratio W/H, the material width ratio B/H and the reduction rate △H/H should be strictly controlled. JTS forging process can be used in forging process of 300MW and above.
In the main deformation stage of blank heating, the initial forging temperature should reach 1250 ~ 1270℃, and ensure enough holding time, in order to facilitate segregation diffusion, to ensure the temperature uniformity of bad material.
The blank with square section is changed into a blank with round section, which is allowed to be compressed into eight sides by flat anvil. The rest of the forming process should be completed by 120° or 135° upper and lower V-shaped anvil.
High temperature stop forging or low temperature stop forging process can be used to eliminate mixed crystal.
Henan Shuangzhi has rich forging experience, the products are exported to Vietnam, Indonesia, Russia and other countries, if you need shaft forging, you are welcome to contact us.
