Method for confirming size of hollow casting blank for extrusion moulding of large-caliber thick-walled tube
A technology for extrusion forming and determining methods, which is applied in the directions of casting molds, casting mold components, casting molding equipment, etc. Efficiency, dimensionally unique, the effect of meeting the demands of high-quality performance
Inactive Publication Date: 2015-07-22
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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However, the size of the blank used in the above forming method is currently based on the size of the given large-diameter thick-walled steel pipe, the extrusion ratio is selected according to experience, and the required volume is determined strictly based on the principle of constant volume before and after extrusion deformation. The size of the blank, the disadvantage is that the design cycle is long, and it will cause unreasonable extrusion deformation of the steel pipe forging billet or casting billet
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[0012] Such as figure 1 , 2 As shown, the dimensions of large-diameter thick-walled pipe forgings are set as follows: outer diameter D = 1.32m, inner diameter d = 0.92m, wall thickness B = 0.2m, and axial length H = 12.0m.
[0013] ① Determine the extrusion ratio λ according to the formula (1):
[0014] λ=3.89+44.5B-21.6B 2 (1)
[0015] Substitute B=0.2m into the above formula to get λ=12.
[0016] ②Extrusion and deformation relation of steel pipe d 0 =d and extrusion ratio definition Obtain the outer diameter of the hollow billet D 0 =3.405m, inner diameter d 0 =0.92m;
[0017] ③ According to the geometric relationship D of the hollow billet size 0 = d 0 +2B 0 And the principle that the volume of the blank before extrusion is equal to the volume of the large-diameter thick-walled pipe forging after extrusion, that is Obtain the hollow billet wall thickness B respectively 0 =1.242m, height H 0 = 1.0 m.
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Abstract
The invention discloses a method for confirming the size of hollow casting blank for extrusion moulding of a large-caliber thick-walled tube, and belongs to the field of machining design for large-caliber thick-walled seamless steel pipes. The method is characterized by comprising the following steps: (1) confirming the extrusion ratio lambda according to the outer diameter D, the inner diameter d, the wall thickness B and the axial length H of a large caliber thick-walled tube forge piece; (2) obtaining the outer diameter D0 and the inner diameter d0 of the hollow casting blank according to the steel pipe extrusion deformation relationship that d0 is equal to d as well as the extrusion ratio definition shown in the description; (3) respectively obtaining the wall thickness B0 and the height H0 of the hollow casting blank according to the hollow casting blank size geometrical relationship that D0 equals to the sum of d0 and 2B0 as well as the principle that the size of a to-be-extruded blank is equal to that of an extruded large caliber thick-walled tube forge piece. The method has the advantages that the only size of the hollow blank can be quickly and precisely confirmed, so that the design efficiency is improved and the production period is shortened; the extrusion deformation amount in the length direction is reasonably distributed, so that the structure property and the quality of a product section are guaranteed.
Description
technical field [0001] The invention belongs to the field of processing and forming design of large-diameter thick-walled seamless steel pipes, and in particular relates to a method for determining the size of a large-diameter thick-walled pipe extrusion-forming hollow billet. Background technique [0002] At present, the common production method of large-diameter thick-walled seamless steel pipes used in supercritical, ultra-supercritical thermal power nuclear power units and petrochemical industries is the extrusion forming process. Application number: 201310025199.9, titled "Method for producing large-diameter thick-walled seamless steel pipes by casting-extrusion composite forming" directly extrudes the hollow billets produced by smelting and casting, which is different from the previous extrusion forming process based on forging billets (smelting-casting Compared with steel ingot-removing head-heating-upsetting-punching-heating-extrusion), it has the advantages of savin...
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IPC IPC(8): B21C23/08B22C9/24
Inventor 秦芳诚李永堂齐会萍付建华
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY