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Flange with neck

A kind of flange, consistent technology, applied in flange connection, pipe/pipe joint/pipe fittings, through components, etc., can solve the problems of unguaranteed air tightness, quality cannot be guaranteed, reliability requirements are not high, etc. Achieve high productivity, fewer processes, and high material utilization

Inactive Publication Date: 2003-03-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first method is the method of plate processing, that is, the rolled plate is blanked and machined into a flange; at the same time, the plate is machined and machined, the coiled plate is welded into a cylindrical shape, and the flange neck is formed after shaping; The blue plate and the flange neck are welded together, and the finished product is machined as a whole; the disadvantage of this method is that the material utilization rate is low, the process is many, the process is complicated, and the cycle is long. In addition, the product has two welds, and the airtightness is not good enough. Guaranteed, poor reliability
The second method is the forging method, that is, the process route of casting, ring rolling and turning machine to add the flange neck. This method has no weld seam, the air tightness can be reliably guaranteed, and the mechanical properties of the product are good. The quality is stable and reliable, but this method requires a large investment in equipment, and only those factories with strong equipment and technical capabilities can adopt it. It is only suitable for the production of standard flanges with large market demand, and the material utilization rate is only 50%.
The third method is the casting method, that is, the neck flange is directly manufactured by casting method. Although the manufacturing cost of this method is low, the quality cannot be guaranteed, and the material required for some flanges is forged alloy. Suitable for casting, this method is powerless, so the flange cast by this method is mainly used in occasions with low pipeline pressure and low reliability requirements, such as gray cast iron and ductile iron flanges, etc., which are widely used in water supply and drainage projects

Method used

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  • Flange with neck

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Embodiment

[0015] LF 2R High neck flange, smelting alloy according to GB3193-82 standard, pouring at 700±15°C, mold temperature 250±50°C, mold closing time, pressure gradually rising time is not more than 5 seconds, when reaching 25MPa, hold pressure for 1 minute and 30 seconds Up to 2 minutes, open the touch, and eject the workpiece. In order to make the workpiece easy to come out, the lubricant can be sprayed in the inner cavity of the mold. The material of the flange is a deformed alloy, which is not suitable for casting. The performance of the flange prepared by the method of this embodiment reaches σ D ≥187Mpa, δ≥24%, good welding performance.

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Abstract

The present invention relates to a pipe connecting piece flange. In order to raise utilization rate of material and ensure product quality said invention provides a flange with neck, and it is characterized by that said flange is made up by adopting extrusion casting method, it has no welded seam, its texture possesses continuous streamline structure characteristics, and its streamline form is identical to the member form in alignment.

Description

Technical field: [0001] The invention relates to a flange of a pipe connector, and in particular provides a flange with a neck obtained by extrusion casting. Background technique: [0002] Flange is an indispensable part in pipeline connection, with a wide range of applications and a large market demand. Among them, the neck flange is a relatively complicated variety of flanges. At present, domestic enterprises specializing in the production of flanges mainly use the following three methods for production. The first method is the method of plate processing, that is, the rolled plate is blanked and machined into a flange; at the same time, the plate is machined and machined, the coiled plate is welded into a cylindrical shape, and the flange neck is formed after shaping; The blue plate and the flange neck are welded together, and the finished product is machined as a whole; the disadvantage of this method is that the material utilization rate is low, the process is many, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/02F16L23/00
Inventor 阎德胜胡宛平杨奇雄
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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