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A pipe mold manufacturing method using large diameter reduction of steel ingot to form blank

A manufacturing method and technology of large diameter reduction, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of limited product specification coverage, complex production process, long manufacturing cycle, etc., to achieve coverage advantages, The effect of simple process and short manufacturing cycle

Active Publication Date: 2016-10-12
HENGYANG VALIN STEEL TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, and provide a pipe mold manufacturing method using a large diameter reduction of steel ingots to form blanks, so as to solve the complex production process, long manufacturing cycle and low yield in the prior art. , product specification coverage is not wide and other deficiencies

Method used

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  • A pipe mold manufacturing method using large diameter reduction of steel ingot to form blank
  • A pipe mold manufacturing method using large diameter reduction of steel ingot to form blank
  • A pipe mold manufacturing method using large diameter reduction of steel ingot to form blank

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Effect test

Embodiment 1

[0032] A DN 300 pipe mold manufacturing method using large diameter reduction of steel ingots to form blanks, including ingot smelting, steel ingot re-inspection, ring furnace heating, hydraulic punching, large diameter reduction piercing, periodic pipe rolling, manual initial inspection, straightening , Rough machining, ultrasonic flaw detection, heat treatment, physical and chemical inspection, finishing, magnetic particle flaw detection, manual re-inspection, packaging and storage;

[0033] Steel ingot smelting: Considering the special working environment of the cast pipe mold, the quality of the steel ingot is the basis. The material of the steel ingot is 21CrMo10, and the content of phosphorus, sulfur, nitrogen, hydrogen and oxygen is strictly controlled, of which the content of phosphorus is less than 0.008%, and the content of sulfur is less than 0.004 %, the nitrogen content is less than 100ppm, the hydrogen content is less than 2 ppm, and the oxygen content is less tha...

Embodiment 2

[0050] A DN 600 pipe mold manufacturing method using large-diameter reduction of steel ingots to form blanks, including ingot smelting, steel ingot re-inspection, ring furnace heating, hydraulic punching, large-diameter reduction piercing, periodic pipe rolling, manual initial inspection, and straightening , Rough machining, ultrasonic flaw detection, heat treatment, physical and chemical inspection, finishing, magnetic particle flaw detection, manual re-inspection, packaging and storage;

[0051] When the steel ingot is re-inspected, the diameter D of the circumscribed circle of edge 2 on the outer periphery of the steel ingot body 1 is 970 mm, and the diameter D of the circumscribed circle of the steel ingot is 40 mm larger than the diameter d of the inscribed circle of edge 2, that is, D=d+40 mm, and the number of ribs 2 is 18 sides, the taper range is 1.8 °, the minimum compression ratio u (rolling ratio) of the pipe mold is 3.0 (socket end);

[0052] When heating the ring...

Embodiment 3

[0060] A DN 1200 pipe mold manufacturing method using large diameter reduction of steel ingots to form blanks, including steel ingot smelting, steel ingot re-inspection, ring furnace heating, hydraulic punching, large diameter reduction piercing, periodic pipe rolling, manual initial inspection, straightening , Rough machining, ultrasonic flaw detection, heat treatment, physical and chemical inspection, finishing, magnetic particle flaw detection, manual re-inspection, packaging and storage;

[0061] When the steel ingot is re-inspected, the diameter D of the circumscribed circle of edge 2 on the outer periphery of the steel ingot body 1 is 1650 mm, and the diameter D of the circumscribed circle of the steel ingot is 40 mm larger than the diameter d of the inscribed circle of edge 2, that is, D=d+40 mm, and the number of ribs 2 is 18 sides, the taper range is 1.9°, the minimum compression ratio u (rolling ratio) of the pipe mold is 3.3 (socket end);

[0062] When heating the r...

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Abstract

A method for manufacturing a pipe mold using large diameter reduction of steel ingots to form blanks, including steel ingot smelting, steel ingot re-inspection, ring furnace heating, hydraulic punching, large diameter reduction piercing, periodic pipe rolling, manual initial inspection, straightening, roughing Processing, ultrasonic flaw detection, heat treatment, qualified physical and chemical inspection, finishing, magnetic particle flaw detection, manual re-inspection, packaging and warehousing. The plug (7) is obliquely rolled and pierced with a large diameter reduction to obtain the capillary 8, and the outer diameter of the capillary 8 after diameter reduction and perforation is 10mm larger than the outer diameter of the socket end of the pipe mold. The invention combines technologies such as hydraulic punching, tapered roller large-diameter reduction piercing, periodic pipe rolling mill forging and rolling, etc., not only can ensure that the pipe mold blank as a whole has a performance similar to that of forgings, but also can make full use of what should be cut off during rolling. The advanced pilger head greatly improves the utilization rate of raw materials, reduces the manufacturing cost of pipe molds by nearly 40%, and has high production efficiency, basically realizing the full coverage of pipe mold specifications.

Description

technical field [0001] The invention relates to the technical field of pipe mold manufacturing, in particular to a pipe mold manufacturing method using large diameter reduction of steel ingots to form blanks. Background technique [0002] At present, the use of centrifugal casting technology to produce ductile iron pipes has the advantages of fast production rhythm and high efficiency, and has extremely broad development prospects. The pipe mold is a large key part of the cast iron pipe on the centrifugal pouring machine, and the use environment is extremely harsh. When the pipe mold is rotating at high speed, molten iron is deposited on the inner wall of the pipe mold due to centrifugal action during pouring, so that the temperature of the inner wall of the pipe mold rises sharply, while the outer surface is cooled by circulating water to reduce the temperature. Because the pipe mold has been subjected to combined working conditions such as alternating thermal stress, tens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/06B21D26/035B21B21/00B21B37/00
Inventor 李阳华肖松良龙功名陈绍林邓丕安冉旭张戟张敏
Owner HENGYANG VALIN STEEL TUBE