Deep hole finish machining method of motor casing of nuclear main pump

Abstract

The invention discloses a deep hole finish machining method of a motor casing of a nuclear main pump. A deep hole finish machining tool of the motor casing of the nuclear main pump is adopted for finish machining of a deep hole of the motor casing of the nuclear main pump such that the internal diameter Phi of the deep hole reaches 1050H7mm and deep depth reaches 2770-25-35. The deep hole finish machining method comprises following steps of: step 1, installing the deep hole finish machining tool; step 2, installing a motor casing workpiece; step 3, craving a groove out of an end surface of an inner hole of the workpiece; step 4, running; step 5, performing semi-fine boring operation, step 6, performing primary precision boring; step 7, performing secondary precision boring; and step 8, honing. The deep hole finish machining method of the motor casing of the nuclear main pump is capable of machining the deep hole of the motor casing of the nuclear main pump in accord with the precision requirement.

Description

technical field [0001] The invention relates to a processing tool, in particular to a deep hole finishing method for a nuclear power main pump motor casing. Background technique [0002] The motor casing of the nuclear power main pump is the main part of the reactor coolant main pump CAP1400 of the national science and technology major project CAP1400 advanced pressurized water reactor nuclear power project. The structure of the motor housing is as follows figure 1 As shown, its technical indicators are as follows: [0003] 1. The total length of the motor housing is 3584mm, and the radial runout of φ1050H7×2770±0.5 in the coaxial hole system and φ1400H7 and φ870H7 of the counterbore at both ends is ≤0.1mm; [0004] 2. Counterbore at both ends φ1400H7, φ870H7 end surface beating ≤ 0.05mm. [0005] For the above-mentioned technical indicators, due to the large diameter and deep depth (2776mm) of the main hole (φ1050H7), and the strict requirements on its radial runout and ...

AI Technical Summary

Problems solved by technology

[0005] For the above-mentioned technical indicators, due to the large diameter and deep depth (2776mm) of the main hole (φ1050H7), and the strict requirements on its radial runout and end face runout, it is difficult to ensure the size no matter whether it is processed on a horizontal lathe or a vertical lathe. Accuracy and shape accuracy, so the existing technology can not manufacture motor casing products that meet the above technical indicators

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