Pipe mold manufacturing process adopting continuous-casting blank to forge and roll rough blank periodically

Abstract

The invention relates to a pipe mold manufacturing process adopting a continuous-casting blank to forge and roll a rough blank periodically, belonging to the technical field of pipe mold manufacture. The manufacturing process comprises the process steps of: smelting of the continuous casting blank in a blast furnace, reinspecting, blanking, heating in a ring-shaped furnace, mannesmann piercing, periodically rolling a pipe, straightening, detecting flaws with magnetic powder, cutting the head and the tail, roughly processing, boring, carrying out ultrasonic flaw detection, thermally treating, sampling and reinspecting, finish processing, carrying out surface strengthening treatment, inspecting, spraying and printing, weighing and warehousing. The pipe mold manufacturing process has the advantages that the continuous casting blank replaces the mold casting blank adopted by the existing process, the characteristics that the yield is high, the cost is low, the energy consumption is less, the structure property is stable and the like are fully exerted, and the cost is reduced in the two aspects of the process and raw materials; in addition, the forging and rolling of a Pilger type rolling machine and the structure characteristics of a classic T-shaped pipe mold are effectively combined, the condition that the pipe mold blank forged and rolled by the process periodically has the performance close to the forged blank of the traditional pipe mold is guaranteed, and the Pilger head which needs to be cut in rolling is fully utilized simultaneously, so that the production efficiency is improved greatly.

Description

Technical field [0001] The invention belongs to the technical field of tube mold manufacturing, and in particular provides a tube mold manufacturing process that uses continuous casting blanks to periodically forge and roll blanks. Background technique [0002] At present, the cold-mold centrifugal casting pipe technology has been very mature, coupled with its fast production pace and high efficiency, basically all medium and small-sized spherical mold casting pipes use this technology. In the production of spheroidal cast pipes by centrifugal casting, the most critical component is the centrifugal nodular cast iron pipe mold. [0003] The centrifugal ductile iron pipe mould (material grade 21CrMo10) is a mould for casting ductile iron pipes, and is a large thermal tooling for producing ductile iron pipes on a centrifugal pipe casting machine. In production, the tube mold is always under severe working conditions, that is, in the state of high-speed rotation, the outer surface is ...

AI Technical Summary

Problems solved by technology

[0008] (1) Existing pipe molds mostly use die-cast blanks, which not only have high process costs and complex processes, but also have low utilization rates of mold-cast blank materials, and the material consumption rate is generally 30-40%, which greatly increases the cost of pipe mold manufacturing

[0009] (2) The existing pipe mold manufacturing adopts deep hole processing technology. Although the nesting process is used in the manufacture of large-diameter pipe molds to improve the utilization rate of raw materials, overall, there is still a large amount of machining consumption. The loss rate of raw materials due to the existing deep hole processing technology is 5% to 10%.

[0010] (3) In the existing pipe mold manufacturing, the socket end of the pipe mold is not easy to form, and additional processes such as thickening and pipe expansion are required to complete the manufacture of the horn-shaped socket end of the pipe mold, which makes the existing pipe mold manufacturing process complicated. , long manufacturing cycle and other issues

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