Austenitic stainless steel thin-walled pipe machining method

Abstract

The invention relates to the field of machining, in particular to an austenitic stainless steel thin-walled pipe machining method. The method comprises the following steps: rough turning, including turning excircles and step end surfaces with machining allowances 2 mm, and erecting a central frame at a right end; clamping, including machining a left end screw hole, which is matched with a left end choke plug, in a workpiece; heat treatment and aging treatment, wherein a right end choke plug rather than the left end choke plug needs to be demounted during aging heat treatment; and semi-fine turning, including clamping the excircle of the left end choke plug with a four-jaw chuck, supporting a right end inner hole with a four-jaw chuck tool on a tailstock with alignment within 0.05 mm, dismounting the four-jaw chuck tool of the tail stock, turning the right end inner hole with an allowance 0.4-0.5 mm, propping the tail stock, dismounting the central frame, and turning all the excircles and end surfaces, with the excircles remaining machining allowances 0.4-0.5 mm; heat treatment and aging treatment; secondary semi-fine turning; fine milling; fine turning; and grinding. The method is simple in machining process, facilitates manufacturing, can ensure the machining quality and dimensional precision of the workpiece, reduces the machining difficulty and the production cost and improves the machining efficiency.

Description

technical field [0001] The invention relates to the field of mechanical processing, in particular to a processing method for an austenitic stainless steel thin-walled tube. Background technique [0002] The key component of a certain product is the eyepiece lens housing. Its processing quality will directly affect the performance of the entire product. Therefore, the requirements for it are very strict. Its material is austenitic stainless steel, which is welded by 3 pieces. , the length of the weld seam is about 2m, the overall size, the wall thickness is 4mm-l5mm, and there are more than 20 optical windows and electrical windows, which require uniform wall thickness and stable size. The coaxiality of the inner and outer circles is required to be within 0.02mm, and there are double grooves on the inner and outer walls of the right end. The parallelism of the upper and lower concave surfaces is required to be within 0.02mm. The outer casing is often deformed during and aft...

AI Technical Summary

Problems solved by technology

The outer shell is often deformed during and after processing, the size is unstable, and the inner hole is prone to inverted trumpet phenomenon

In particular, the deformation during and after finishing reduces the accuracy of the outer shell, which fails to meet the design requirements and seriously affects the processing quality of the workpiece.

Combining many years of technological experience and theoretical knowledge, I believe that the main reason for the deformation of the outer shell is that the wall thickness of the outer shell is too thin, the rigidity is too poor, there are welding stress, cutting stress, clamping deformation and twisting deformation in the process, especially the precision Distortion and deformation during processing have a great impact on the processing quality of thin-walled tube shells