Machining method of high-precision and large-diameter ultralong and ultrathin shell

A processing method and large-diameter technology, applied in the field of metal processing, can solve the problems of dimensional accuracy or surface quality that cannot meet the application requirements, and achieve the effects of low cost, uniform and small structure, and labor-saving forming

Active Publication Date: 2015-12-23
有研金属复材技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pipes formed only by extrusion cannot meet the application requirements regardless of dimensional accuracy or surface quality.

Method used

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  • Machining method of high-precision and large-diameter ultralong and ultrathin shell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A 6061 aluminum alloy bar with a diameter of 400mm was formed by reverse extrusion at an extrusion temperature of 460°C, an extrusion speed of 5mm / s, and an extrusion ratio of 2 to 5 to obtain a thick-walled aluminum alloy with a wall thickness of 25mm and a linear segment length of 200mm case. After machining, a spinning blank with an outer diameter of 300mm and a wall thickness of 20mm is obtained.

[0036] Use multi-turn and multi-pass strong forward spinning to complete the subsequent processing. The total thinning rate per turn is 80%, the first-pass thinning rate is 30%, the feed ratio is 1.3, and the second-pass thinning rate is 25. %, the feed ratio is 2, the third pass thinning rate is 25%-30%, and the feed ratio is 1.

[0037] After spinning, the material is discharged, and the intermediate annealing is carried out. The annealing temperature is 420℃ and the heat preservation is 2.5h. The shell after the intermediate annealing is pickled, and then the arc part of ...

Embodiment 2

[0039] The SiC / Al-based composite bar with a diameter of 300mm is formed by reverse extrusion, the extrusion temperature is 480℃, the extrusion speed is 0.1mm / s, and the extrusion ratio is 3.5 to obtain a thick wall with a wall thickness of 20mm and a straight line length of 200mm. Aluminum-based composite shell. After machining, a spinning blank with an outer diameter of 300mm and a wall thickness of 15mm is obtained.

[0040] Use multi-pass strong positive heating spinning to complete subsequent processing, spinning temperature 250-430℃, total thinning rate 60%, first-pass thinning rate 25-30%, feed ratio 0.8, second-pass The thinning rate is 20-25%, the feed ratio is 1.6, the third pass is 20%-30%, the feed ratio is 1.6, the fourth pass is 20-30%, and the feed ratio is 0.8.

[0041] After spinning and unloading, the finished pipe is heated at 530°C for solution treatment, kept for 60min, and then artificially aged at 160°C for 9h. Pickling the finished pipe after heat treatmen...

Embodiment 3

[0043] A pure aluminum bar with a diameter of 1000mm was reverse-extrused, at an extrusion temperature of 420°C, an extrusion speed of 8mm / s, and an extrusion ratio of 10, to obtain a thick-walled aluminum alloy shell with a wall thickness of 120mm and a straight section length of 1000mm. After machining, a spinning blank with an outer diameter of 990mm and a wall thickness of 90mm is obtained.

[0044] Use multi-turn and multi-pass strong forward spinning to complete subsequent processing. The total thinning rate for each turn is 75%, the first-pass thinning rate is 30-40%, the feed ratio is 1.3, and the second-pass thinning The rate is 25-30%, the feed ratio is 2.2, the third pass thinning rate is 25%-30%, and the feed ratio is 1.5.

[0045] After spinning and unloading, the solid solution treatment temperature of the finished pipe is 490℃, the heat preservation is 60min, and the artificial aging at 150℃ is 13h. Pickling the finished pipe after heat treatment, and then performin...

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Abstract

The invention relates to a machining method of a high-precision and large-diameter ultralong and ultrathin shell. The machining method comprises the following steps: (1) a rod is machined to a think-wall shell through a reverse extruding mode; (2) a spun blank having a size accordant with design requirements is obtained through machining; (3) a large-diameter ultralong and ultrathin aluminum alloy/aluminum base composite shell linear section part is obtained through multi-spinning travel and multipass strong spinning; (4) the annealing or solution treatment is performed for the shell linear section part in the step (3); (5) the acid washing is performed; (6) an arc part at the end part of the shell is machined with high precision; and (7) the whole inner and outer surfaces of the shell are polished to obtain a large-diameter ultralong and ultrathin aluminum alloy/aluminum base composite shell with high size precision and excellent performance. The large-diameter ultralong and ultrathin aluminum alloy/aluminum base composite shell, machined by the method, is higher in size precision, uniform and small in structure, excellent in comprehensive performance, high in material utilization rate, simple in tool and labor-saved in formation.

Description

Technical field [0001] The invention belongs to the technical field of metal processing, and particularly relates to a processing method of a high-precision large-diameter, ultra-long and ultra-thin shell. Background technique [0002] High-precision, large-diameter, ultra-long and ultra-thin aluminum alloy shells have a broad application prospect in the field of automotive lightweight. High-precision, large-diameter, ultra-long, and ultra-thin aluminum alloy shells are difficult to control deformation, optimize wall thickness, and process accuracy due to their complex structure, large size, long length, and thin wall. The biggest difference between thin-walled parts and thick-walled parts is the instability of deformation. The process parameters for preparing thick-walled parts cannot be applied to thin-walled parts. It is often difficult to prepare large-diameter aluminum alloy thin-wall shells by extrusion-stretching method due to the limitations of extrusion and stretching e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 邬小萍
Owner 有研金属复材技术有限公司
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