Structure for ensuring requirement for high coaxiality of large-diameter precision pipe body workpiece and method

Abstract

The invention discloses a structure for ensuring the requirement for high coaxiality of a large-diameter precision pipe body workpiece and a method. The structure includes an adjustable center supportand a center frame, the adjustable center support includes a support body, a center support body, a support rod, support blocks and the like, and the support blocks are arranged on the center frame with the included angle being 120 degrees. The adjustable center support can realize the requirement of clamping of the pipe body workpiece in jacking and clamping manners, clearance-free fit with an inner hole of the workpiece can be achieved, and the clamping accuracy is improved; as for the support blocks, radial size adjustment can be realized, so that the use range of the tool is widened, andthe manufacturing quantity and cost are reduced; a workpiece thickness wall measuring method is used for calibrating and adjusting the clamped workpiece, the coaxiality of the axis of the inner hole of the workpiece and the main axis of a machine tool before finish turning is achieved, and the design requirement for high coaxiality with the inner hole when the sizes of all parts of an outer circleare subjected to finish turning is met; and the characteristics of a Babbitt alloy material are used, the machine tool accessory center frame is modified, the centering accuracy can be effectively improved, system errors caused by original center frame bearing gaps are eliminated, and the processing accuracy requirement is ensured.

Description

technical field [0001] The invention belongs to the field of mechanical manufacturing and processing, and in particular relates to a structure and a method for ensuring high coaxiality requirements of large-diameter precision pipe workpieces. Background technique [0002] see figure 1 As shown, the main hole A size of the existing large-diameter high-precision pipe body workpiece is ￠600H8, the roughness is ≤0.8, the straightness is ≤0.1mm, the hole depth ranges from 4000mm to 8000mm, and the outer shoulder circle c and the inner shoulder of the butt joint of the pipe body The coaxiality between hole B and main hole A is ≤0.03mm, the coaxiality between connecting thread a at both ends and main hole A is ≤0.06mm, and the coaxiality between pipe outer circle b and main hole A is ≤0.06mm. The technical difficulty of manufacturing is to ensure the high coaxiality requirements of the outer circle, the threads at both ends, the shoulder hole / shoulder circle and the main hole A. ...

AI Technical Summary

Problems solved by technology

[0003] In view of this, the purpose of the present invention is to provide a processing method that guarantees high coaxiality requirements for large-diameter precision tubular workpieces, so as to solve the deficiencies in the prior art

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