Floating boring head for processing inner surface of bent tube billets

Abstract

The invention discloses a floating boring head for processing inner surface of bent tube billets, wherein one end of a boring bar connector is connected with a boring bar while the other end thereof is flexibly connected with a universal connection block; the other end of the universal connection block is connected with a support shaft; a guide mould is installed on the support shaft through a bearing; a boring cutter mechanism comprises a cutterhead and a boring cutter; the other end of the support shaft is fixedly connected with the cutterhead; and two boring cutters are symmetrically fixed by the central line on the cutterhead. In the floating boring head, as the other end of the boring rod connector is flexibly connected with the universal connection block, the guide mould can vertically and transversely move relative to the boring bar in the tube billet and adapts curvature of the tube billets effectively; moreover, the guide mould and the boring cutter mechanism are in a rigid connection manner; thus, the guide mould can transfer the curvature of the tube billets to the boring cutters well so as to ensure wall thickness uniformity of the processed tube billets, realize high processing efficiency, wide processing range, and small equipment upgrading investment and not influence the processing performance of the original boring lathe after transformations.

Description

technical field [0001] The invention belongs to the field of machining, in particular to a floating boring head for machining the inner surface of a curved tube blank. Background technique [0002] When the centrifugally cast tube blank is heat treated before machining, due to the influence of technology and objective factors, the tube blank has different degrees of bending, which causes great difficulties to the machining process, and the wall thickness of the tube blank after machining Uniformity has a great influence on the subsequent process - hot rolling. Therefore, how to solve the processing of curved tube blanks is very critical in the process of centrifugal casting + hot rolling to produce seamless steel pipes. [0003] The traditional method is to use a deep hole boring machine to process the inner hole of the slender tube blank, which has been widely used in the machining industry. The boring head and the boring bar are rigidly connected. During the processing, th...

AI Technical Summary

Problems solved by technology

The bending degree of the tube billet processed by the floating grinder should not be too large, and the processing efficiency is low, but the processed surface quality is good; the internal shot blasting work efficiency is high, and the tube billet bending degree is high, but for the tube billet with a diameter of less than 300mm Difficulty; internal sandblasting can treat the inner surface of small-diameter curved tube blanks, but this method is inefficient and the treatment effect is poor

[0005] There are also special methods for the processing of curved tube billets by transforming the power transmission system and workpiece clamping method of deep-hole boring machines, but this method has disadvantages such as large investment in transformation and narrow processing range of special boring machines (only curved tube billets can be processed). Therefore, the overall cost performance is lower

[0006] To sum up, none of the above-mentioned processing methods can effectively solve the machining problem of curved tube blanks.

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