Machining technology for ultra-long large-diameter thin-wall steel pipe

Abstract

The invention discloses a machining technology of an ultra-long large-diameter thin-wall steel pipe. The technology comprises a steel pipe blank outer circle machining step and an inner hole machining step, and further comprises the previous steps that S1, the center of a blank is roughly determined; S2, a reference for measurement is machined; S3, accurate measurement is performed; S4, the reference is corrected; S5, a machining technology reference is manufactured; and S6, data are retested to ensure that the reference is correct. According to the technology, three-dimensional scanning and a traditional technology are combined, a blank model is constructed through three-dimensional scanning to be matched with a target model, the center of the blank and the machining reference are accurately positioned at a time, the steel pipe blank is further supported by arranging a tool clamp at the machining reference, the strength of the ultra-long steel pipe is improved, the problem that the machining precision is affected due to deflection generated by gravity in the length direction of the steel pipe is solved, and the machining technology reference is effectively transferred when different machine tools alternately work.

Description

technical field [0001] The invention relates to the technical field of metal pipe processing, in particular to a machining process for ultra-long-diameter thin-walled steel pipes. Background technique [0002] With the rapid development of my country's heavy equipment manufacturing industry, all kinds of large-diameter thin-walled steel pipes using forged blanks are more and more widely used, the demand continues to rise, and the quality requirements and machining difficulty of products are also constantly increasing. [0003] like figure 1 As shown, the current new requirement is super long diameter thin wall steel pipe structure, delivery size inner diameter φ1076mm, outer diameter φ1166mm, total length nearly 9000mm, wall thickness only 45mm, inner and outer circle coaxiality and cylindricity tolerance 0.04mm, end face The verticality is 0.025mm, and the part needs to be finished and delivered. From the analysis of mechanical processing technology, there are many manufa...

AI Technical Summary

Problems solved by technology

[0004] 1. It is not easy to accurately measure the blank

Because the billet is made by steel ingot forging, the wall thickness is difficult to control and the margin is uneven. It is difficult to accurately determine the center of the part with the traditional method of scribing and measuring the wall thickness, and it is easy to form a local shortage, and there is a risk of scrapping

[0005] 2. Difficulty in clamping

The part has a large diameter, thin wall, and poor overall rigidity. The clamping force should not be too large during processing and clamping, otherwise it will cause deformation and affect accuracy; the clamping force is too small and cannot be clamped tightly, and the safety is poor; the total length of the blank exceeds 9 meters. In the length direction, there will be problems such as deflection due to gravity, which will affect the processing accuracy

[0006] 3. It is difficult to process long and deep holes

[0007] 4. Difficulties in determining and transferring processing technology benchmarks

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