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 pipe mold manufacturing, and in particular provides a pipe mold manufacturing process using continuous casting slabs forging and rolling blanks periodically. Background technique [0002] At present, the centrifugal casting pipe technology of cold mold method has been very mature. In addition, its production rhythm is fast and the efficiency is high. Basically, all medium and small-sized spherical mold casting pipes adopt this technology. In the production of spherical mold cast pipes by centrifugal casting method, the most critical part is the centrifugal ductile iron pipe mold. [0003] The centrifugal ductile iron pipe mold (raw material grade is 21CrMo10) is a mold for casting ductile iron pipes and a large-scale thermal tooling for producing ductile iron pipes on a centrifugal pipe casting machine. During production, the pipe mold is always under harsh working conditions, that is, in a state of high...

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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