Flange with neck and its preparing method

Abstract

The present invention relates to a LF 2R High-neck flange, obtained by extrusion casting, has no weld seam, and its microstructure presents a continuous streamlined structural feature, and its streamlined shape is consistent with the direction of the flange shape; a preparation method of a LF2R high-neck flange of the present invention , the metal liquid crystallizes and solidifies under the pressure in the mold casting cavity composed of the upper pressure head, the female mold (5), the mold core (4) and the ejector pin (9); the extrusion casting process is: pouring at 700±15°C , The mold temperature is 250±50°C. When the mold is closed, the pressure gradually rises for no more than 5 seconds. When it reaches 25MPa, the pressure is kept for 1 minute 30 seconds to 2 minutes. The necked flange casting of the present invention has few internal defects, compact structure and high mechanical properties. The squeeze casting process has strong applicability, wide range of material selection, simple process, good stability, high casting quality, and easy casting. Implement automation.

Description

Technical field:

[0001] The invention relates to a pipe connector flange, and in particular provides a necked flange obtained by a squeeze casting method and a preparation method thereof. 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...

Examples

Embodiment

[0021] 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.

Technical field:

[0001] The invention relates to a pipe connector flange, and in particular provides a necked flange obtained by a squeeze casting method and a preparation method thereof. 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...

Examples

Embodiment

[0021] 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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