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Preparation machining method of large-diameter pipe material and special-shaped pipe fitting

A technology for special-shaped pipe fittings and large-diameter pipes is applied in the field of preparation and processing of large-diameter pipes and special-shaped pipe fittings. Defects such as spinning cracks, good product structure uniformity, fine and uniform structure

Active Publication Date: 2014-06-11
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using plate coil welding + spinning forming method to prepare and process large-diameter pipes and special-shaped pipe fittings has the advantages of low cost, but the existence of welds reduces its comprehensive performance and the quality of products is poor; The uniformity is poor, and there are casting defects such as pores, inclusions, and shrinkage cavities; when forging and rolling rings are difficult to deform materials such as nickel-based alloys, the deformation temperature is difficult to accurately control, and mixed crystal structures are prone to appear in the tube blank; low plastic discontinuities Reinforced metal composite materials are easy to crack when forging and rolling rings; hard-to-deform materials such as nickel-based alloys have high deformation resistance, and it is difficult to process large-diameter spinning tube blanks by cross-rolling perforation and traditional extrusion methods

Method used

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  • Preparation machining method of large-diameter pipe material and special-shaped pipe fitting
  • Preparation machining method of large-diameter pipe material and special-shaped pipe fitting
  • Preparation machining method of large-diameter pipe material and special-shaped pipe fitting

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The processing object is Inconel718 alloy pipe. After the Inconel718 alloy forging rod is blanked, it is punched and machined to prefabricate a hollow billet with an outer diameter of Ф300 mm and an inner diameter of 120 mm, and then carries out isothermal composite extrusion. The extrusion ratio is 1 mm / s, the extrusion ratio is 3.4, and the extrusion temperature is 1050 °C. After machining, the outer diameter of the spinning tube blank is Ф295 mm, and the wall thickness is 12 mm. A three-wheel powerful spinning machine is used for thinning and spinning. The thinning rate of the first pass is 18%, and the thinning rate of subsequent passes is 25%. The feed ratio of the first two passes of the finished product is 0.7 mm / r. The feed ratio of other passes is 1.8 mm / r, the deformation of solution treatment is 70%, the solution temperature is 1065 ℃, and it is kept at this temperature for 2 h, and then water quenched. The finished pipe adopts the standard heat treatment sys...

Embodiment 2

[0042] The processing object is GH4698 alloy special-shaped pipe fittings. After the GH4698 alloy forging rod is blanked, it is punched and machined to prefabricate a hollow blank with an outer diameter of Ф260 mm and an inner diameter of 120 mm. A hollow billet was prefabricated with a normal carbon steel ladle with a wall thickness of 10 mm, and then hot-die composite extrusion was carried out at an extrusion speed of 1.5 mm / s, an extrusion ratio of 2.7, an extrusion temperature of 1220 °C, and an extrusion die temperature of to 950°C. After machining, the outer diameter of the spinning tube blank is Ф256 mm and the wall thickness is 10 mm. Three-wheel powerful spinning machine is used for thinning and powerful spinning, the wall reduction rate of the first pass is 21%, the subsequent pass thinning rate is 27%, the feed ratio is 1.5 mm / r, and the deformation of solution heat treatment It is 65%, the solid solution temperature is 1100 ℃, it is kept at this temperature for 1 ...

Embodiment 3

[0044] The processing object is Monel400 alloy special-shaped pipe fittings. After the Monel400 forging rod is blanked, it is punched and machined to prefabricate a hollow billet with an outer diameter of 420 mm and an inner diameter of 180 mm, and then isothermal composite extrusion. The extrusion ratio is 0.5 mm / s, the extrusion ratio is 4.5, and the extrusion temperature is 980 °C. After machining, the outer diameter of the spinning tube blank is Ф410 mm and the wall thickness is 12 mm. A three-wheel powerful spinning machine was used for thinning spinning, the thinning rate of the first pass was 20%, the subsequent pass was 25%, and the feed ratio was 2 mm / r. The annealing deformation is 70%, the annealing temperature is 900 ℃, and the temperature is kept at this temperature for 1.5 h. After heat treatment, the semi-finished pipe has an outer diameter of 396 mm and a wall thickness of 4 mm. The heat-treated pipe is subjected to three times of strong spinning to bring out ...

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Abstract

The invention belongs to the technical field of metal machining, and particularly relates to a preparation machining method of a large-diameter pipe material and a special-shaped pipe fitting. The preparation machining method comprises the following steps of prefabricating a hollow blank by punching, carrying out isothermy or hot mould combined extrusion on the hollow blank, machining the inner and outer surfaces of an extruding tube blank, and carrying out multi-pass cold or hot power cone spinning on the machined tube blank; carrying out intermediate heat treatment (which can be annealing or solution treatment) on a semi-finished pipe material product; repeatedly and alternately carrying out multi-pass power cone spinning and the intermediate heat treatment, and carrying out power spinning on the finished pipe material product; carrying out multi-pass composite spinning forming on the semi-finished pipe material product after heat treatment so as to obtain the special-shaped pipe fitting; and carrying out acid pickling and cleaning on the obtained pipe fitting and special-shaped pipe fitting and then carrying out thermal treatment on the finished product. The preparation machining method of the large-diameter pipe material and the special-shaped pipe fitting provided by the invention has the advantages that the large-diameter pipe material and the special-shaped pipe fitting are prepared and machined, the product organization is uniform, the combination property is high, the forming is effort-saving, the additional value is high, and a product has good popularization and application prospect and definite economic benefits and social benefits.

Description

technical field [0001] The invention belongs to the technical field of metal processing, in particular to a method for preparing and processing large-diameter pipes and special-shaped pipe fittings. Background technique [0002] Difficult-to-deform materials such as nickel-based alloys, titanium alloys, zirconium alloys, and discontinuous-reinforced metal-matrix composites have excellent performance and have excellent and unique performance. Therefore, they are used in many military technologies such as aviation, aerospace, weapons, ships, and nuclear industries. It is widely used in the field and is the material basis of modern weapons and equipment. Difficult-to-deform material pipes and special-shaped pipe fittings are widely used in aviation, aerospace, petroleum, chemical, electric power, nuclear energy and other industrial fields. The preparation and processing methods of large-diameter pipes and special-shaped pipe fittings mainly include: casting spinning tube blank...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06B21C31/00
Inventor 郭胜利
Owner GRIMAT ENG INST CO LTD
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