Double-disk flange and through-wall flange spheroidal graphite cast iron straight pipe integral casting technology
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A ductile iron and flange technology, applied in the direction of casting mold, casting mold composition, casting molding equipment, etc., can solve the problems of difficult casting of flanged pipe, unable to meet market demand, uneven pipe wall thickness, etc. The qualified rate of molding, the improvement of the qualified rate of primary hydraulic pressure, and the effect of user satisfaction
Active Publication Date: 2017-05-24
LIAONING EVER FOUNDRY CO LTD
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Problems solved by technology
Among them, the main problems of ordinary sand casting are uneven wall thickness and bending deformation; the main problems of lost foam casting are slag inclusion, many pores, and high water leakage rate in hydraulic test.
In particular, it should be pointed out that the smaller the pi
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[0052] The model cluster is prepared by a core shooter; the mixed phenolic resin sand is injected into the cavity of the outer mold and the core mold respectively, blown with triethylamine to solidify and form, and is ready for use after demoulding. The outer mold part includes: 1 outer mold of the upper flange, 4 outer molds of the transition section, and 1 outer mold of the upper flange. The core includes: 1 upper section core, 4 transition section cores, 1 lower section core, and 5 core connecting sleeves.
[0053] (3) Combined model clusters...
Embodiment 2
[0066] Casting PN10, length 2.5 meters, DN100 disc insert with wall-through flange straight pipe, the wall-through flange is 1 meter away from the single disc flange, the method is:
[0067] (1) Mold preparation
[0068] A. Preparation of external molds; prepare DN100, external molds for the socket of the lower section, external molds for transition sections, external molds for PN10 upper section flanges, and external molds for through-wall flanges.
[0071] The model cluster is prepared by a core shooter; the mixed phenolic resin sand is injected into the cavity of the outer mold and the core mold respectively, blown with triethylamine to solidify and form, and is ready for use after demoulding. Among them, the outer mold part includes: 1 section of the outer mold of the upper flange, with a len...
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Abstract
The invention discloses a double-disk flange and through-wall flange spheroidal graphite cast iron straight pipe integral casting technology. A lower section flange outer die, a through-wall flange section outer die, a transitional section outer die, an upper section flange outer die, a steel pipe framework, a transitional section core, a parting surface locating table, a through-wall flange, a screw rod and the like are involved; the screw rod is arranged on a lower pressing plate and fixed at the lower part of the lower pressing plate through a nut; a lower section core, a core connection sleeve and the through-wall flange are arranged on the lower pressing plate; the through-wall flange section outer die is arranged on the lower section flange outer die; the transitional section outer die and the upper section flange outer die are arranged on the through-wall flange section outer die; an ingate is arranged at the right middle part of the lower section core; the transitional section core and the parting surface locating table are arranged at the right part of the lower section core. According to the double-disk flange and through-wall flange spheroidal graphite cast iron straight pipe integral casting technology, by horizontal parting and vertical stepped negative pressure pouring, the molding qualification rate is increased, and the quality is more reliable; pressure casting enables an alloy structure to be more compact, so that the environmental protection is facilitated, dust can be all recycled, and environmental-friendly casting is really realized; the technology is applied to the technical field of integral casting of metals.
Description
technical field [0001] The present invention relates to a double-disc flange and through-wall flange nodular cast iron straight pipe integral casting technology in the technical field of metal integral casting technology, in particular to a ductile iron double-disk through-wall flange straight pipe with DN100-DN200×3 meters or more Integral casting. Background technique [0002] At present, most of the ductile iron double-flange straight pipes and wall-penetrating double-coil pipes used for pressure bearing are manufactured by welding. Due to the limitation of cast iron welding materials, the welding parts are all "heterogeneous" welds. Due to the different materials of the weld and the substrate, and the interference of the heat-affected zone of the weld, it is difficult for the mechanical properties of the welded flange to meet the standard requirements. According to ISO2531; 2009 international standard and GB / T13295-2013 national standard, the minimum tensile strength of...
Claims
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Application Information
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