Extrusion molding method of nickel based alloy sphere for valve
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A nickel-based alloy, extrusion forming technology, applied in valve devices and other directions, can solve problems such as mixed crystals, product scrap, cracking, etc., and achieve the effects of ensuring continuity, less machining time, and high material utilization.
Inactive Publication Date: 2016-09-28
22MCC GRP PRECISION FORGING
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Problems solved by technology
The existing high-temperature alloy sphere manufacturing process is formed by free forging, die forging, and multi-fire forging. During the forging process, cracking and mixed crystals often occur, resulting in product scrapping
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Embodiment 1
[0027] Embodiment 1: a sphere whose material is Inconel625 and whose specification is DN80.
[0028] (1) Through computer numerical simulation technology, the technical parameters of a spherical extrusion made of Inconel625 and DN80 are determined as follows:
[0029] Table 1 Extrusion Technical Parameters
[0030] model Billet diameter Forging weight Initial forging temperature Final forging temperature DN80 Φ90mm 6.5 kg 1180 ℃ ≥800 ℃
[0032] (3) Preheat the billet to 100°C first, then apply lubricant and adhesive on the surface of the billet, add a soft cover, and then heat the billet to 1180°C±20°C;
[0033] (4) The mold is installed in place, and the preheating temperature reaches above 400°C;
[0034] (5) Adopt 4000T multifunctional metal extrusion machine, set the extrusion program, adopt pressure control for the upper die, and adopt d...
Embodiment 2
[0041] Embodiment 2: a sphere whose material is Incoloy825 and whose specification is DN200.
[0042] (1) The technical parameters of a spherical extrusion made of Incoloy825 and DN200 are determined by computer numerical simulation technology as follows:
[0043] Table 2 Extrusion Technical Parameters
[0044] model Billet diameter Forging weight Initial forging temperature Final forging temperature DN200 Φ200mm 130kg 1200 ℃ ≥800 ℃
[0046] (3) Preheat the billet to 100°C first, then apply lubricant and adhesive on the surface of the billet, add a soft cover, and then heat the billet to 1180°C±20°C;
[0047] (4) The mold is installed in place, and the preheating temperature reaches above 400°C;
[0048] (5) Adopt a 12000T multi-functional metal extrusion machine, set the extrusion program, adopt pressure control for the upper die, and adopt ...
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Abstract
The invention relates to an extrusion molding method of a nickel based alloy sphere for a valve. The extrusion molding method comprises the steps that technological parameters are determined through computer numerical simulation; a blank is firstly preheated and then continues to be heated to the forging temperature; a program is set through extrusion equipment; running is carried out for extrusion; pressure maintaining is carried out after mold combining of molds is completed, and a puncher pin carries out extrusion to a set position; the molds and the puncher pin reset, and the sphere blank is demolded; and blank air cooling, heat treatment and machining are carried out. The extrusion molding method has the beneficial effects that one-time heating extrusion molding is achieved, and a nickel based alloy is prevented from cracking and alloy element impoverishment in the forging process; metal flow line continuity is guaranteed, and corrosion resisting performance is improved; in the extrusion molding process, deformation of materials is large, extremely sufficient recrystallization is carried out in the deformation process, grains are refined, and the phenomena of coarse grains and mixed grains happening in the free forging process and the mold forging process are avoided; and the material utilization rate is high, machining work hours are few, and the production efficiency can be effectively improved.
Description
technical field [0001] The invention relates to the technical field of valve body processing, in particular to an extrusion forming method of a nickel-based alloy sphere for a valve. Background technique [0002] Nickel-based alloy is an alloy with both thermal stability and thermal strength, and is mainly used in hot-end equipment such as aviation and aerospace. With the development of science and technology, superalloys, especially nickel-based alloys, are more and more widely used in electric power, petroleum and petrochemical industries. [0003] The ball valve is the most widely used valve at present, and the ball is the key component of the ball valve. With the vigorous development of supercritical, ultra-supercritical thermal power and nuclear power, more stringent requirements are put forward for the corrosion resistance and high temperature resistance of the valve itself, especially the ball. Ordinary heat-resistant steel, such as F91, F92 and stainless steel, suc...
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