Manufacturing method of slender shaft type rotor forge piece
A technology for rotor forgings and manufacturing methods, which is applied in the field of manufacturing slender shaft rotor forgings, can solve the problems of ultrasonic flaw detection, low pass rate of mechanical performance, strength uniformity index, etc., achieve light forging cracks and folding damage, and good surface quality , to ensure the effect of uniformity
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Embodiment 1
[0040] This embodiment provides a method for manufacturing a slender shaft rotor forging, such as Figure 1 to Figure 7 As shown, the method includes the following steps:
[0041] Step 1. In the first fire, the steel ingot 1 is pre-drawn by KD method and the nozzle end is cut to press the jaws;
[0042] In step 1, after the KD method is pre-drawn, the blanking method of directly pressing the forging jaw at the nozzle end 2 of the steel ingot can effectively control the cutting amount of the nozzle end 2 of the steel ingot. It can prevent the nozzle end blank with poor metallurgical quality from participating in deformation or entering the forging body, ensuring the purity of the forging blank body, and effectively improving the pass rate of forging ultrasonic flaw detection.
[0043] Step 2, during the second firing, the steel ingot 1 blank in step 1 is subjected to upsetting and KD method elongation treatment;
[0044] Step 3. During the third fire, the billet is drawn and ...
Embodiment 2
[0059] In this embodiment, a 600MW condenser rotor forging is used. The shaft diameter of the condenser rotor forging is 1400mm, the total length is 15000mm, and the forging weighs 118t. The forging method of the slender shaft rotor forging provided in Example 1 is adopted. The method includes the following step:
[0060] Step 1, the first firing: Carry out the KD method pre-drawing of the steel ingot 1, the pre-drawing forging ratio is 1.6, and the reduction rate of each anvil is ≥ 20%; 10% of the weight of the ingot body, L / D=2.3 after blanking, cut off the entire riser and nozzle end to discard.
[0061] Step 2, the second firing: the overall upsetting of the billet, the upsetting ratio is 2.2; the KD method is used to elongate, the elongated forging ratio is 4, and the reduction rate of each anvil is ≥ 20%; after the KD method is elongated, the surface of the forging is thoroughly cleaned crack.
[0062] Step 3, the third firing: the finished product is drawn out from th...
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