CN103273274A

CN103273274A - Forming method for magnesium alloy boards

Info

Publication number: CN103273274A
Application number: CN2013102282239A
Authority: CN
Inventors: 张治民; 王强; 张星; 杨勇彪; 孟模
Original assignee: North University of China
Current assignee: North University of China
Priority date: 2013-06-07
Filing date: 2013-06-07
Publication date: 2013-09-04
Anticipated expiration: 2033-06-07
Also published as: CN103273274B

Abstract

The invention relates to a forming method for magnesium alloy boards. The forming method comprises blanking, blank producing, heating, hot rolling or further comprises cold rolling, acid picking, finish rolling, finished product shear rolling and follow-up treatment. The forming method is characterized in that before the hot rolling process, processes of extruding a pre-prepared magnesium alloy blank into a tubular blank of a set diameter and wall thickness and producing the flattened tubular blank into a hot-rolled slab are included, the diameter of the tubular blank is determined by the required width of the subsequently flattened hot-rolled slab, the thickness of the tubular blank is determined by the thicknesses of required boards and a preset hot rolling deformation, the hot rolling direction is perpendicular to the flow direction of extrusion metal, namely, the hot-rolled slab is fed to a hot mill in a direction perpendicular to the flow direction of the extrusion metal. According to the forming method, the rolling formability and the yield of magnesium alloys are improved, boards of various dimensions and provided with superior mechanical properties and good secondary formability can be obtained, and urgent and difficult problems of forming of the magnesium alloy boards are solved.

Description

A kind of magnesium alloy plate manufacturing process

Technical field

The present invention relates to magnesium alloy and be processed into the section bar technology, belong to light metal material advanced manufacturing technology category, be specially a kind of manufacturing process of magnesium alloy plate, be mainly used in the production of magnesium alloy plate.

Background technology

Magnesium alloy has been widely used in many aspects in military and civilian field in recent years as a kind of novel light metal Material Used, is known as the most promising lightweight material in the industry.Sheet material is the most popular section bar of metal, and with the form of magnesium alloy plate as the intermediate products supply, will greatly simplify the production procedure of magnesium alloy materials deep processing, thereby reduce production costs, enlarge range of application.

At present, the production of magnesium alloy plate mainly is to adopt milling method, and the magnesium alloy plate rolling mode of Application and Development mainly contains: synchronously rolling, asymmetrical rolling, Asymmetric Rolling, equal channel angular rolling, double roller continuous casting tandem rolling, build long-pending ply rolling etc.The blank of rolling usefulness can be strand, extruded stock or forging stock.

The strand of rolling usefulness is that slab ingot semicontinuous or continuous casting forms through sawing, the face of milling.But because magnesium is close-packed hexagonal structure, plasticity is lower, rolling processing difficulties, and the control of technological parameters such as rolling temperature, deflection is strict, and the single deflection is little, and rolling pass is many.The volumetric heat capacity of magnesium alloy is less in addition, heat up and radiating and cooling all than comparatively fast, in plastic deformation temperature decline very fast, and inhomogeneous, take place easily that the limit is split and crackle, the product lumber recovery is low.Continuous casting and rolling saved sawing, mill operation such as face, effectively utilized heat energy, and problem is difficult to solve but rolling pass is many, lumber recovery is low etc.

The extruded stock of rolling usefulness is the slab that ingot casting or casting rod form through extruding, and forging stock is the slab that ingot casting or casting rod form through forging, with direct rolling the comparing of strand, extruded stock or forging stock through a plastic deformation, its roll forming is improved, but the sheet material anisotropic problem still is difficult to solve, and because the size of extruded stock or forging stock is restricted the sheet material fabric width.

Therefore, improve magnesium alloy rolling formability and lumber recovery, can obtain various sizes, good mechanical performance, sheet material that secondary forming is good has become the rolling urgent need of existing magnesium alloy plate and insoluble problem.

Summary of the invention

The objective of the invention is the deficiency that comprehensive the above prior art exists, prior art is done further improvement, propose a kind of improving the quality and lumber recovery, the magnesium alloy plate manufacturing process that reduces production costs.

For achieving the above object, technical scheme of the present invention is:

A kind of magnesium alloy plate manufacturing process comprises operation: blanking---base---heating---hot rolling, or also comprise operation: cold rolling---pickling---finish rolling---finished product is cut and rolled---subsequent treatment; It is characterized in that: before described hot-rolled process, also have previously prepared magnesium alloy blank extrusion molding is set diameter, set the tubular base of wall thickness, and after flattening, made the operation of hot rolling slab by tubular base; Tubular base diameter is determined that by the required width of hot rolling slab of follow-up flattening the thickness of tubular base is determined by required sheet metal thickness and default hot rolling deformation amount; Described rolling direction is namely sent the hot rolling slab in hot-rolling mill perpendicular to the flow direction of extrusion metal perpendicular to the flow direction of extrusion metal.

The tubular base of distinguish that described tubular base is extrusion molding, or the tubular base of distinguish that is cut into along the extruded tube radial saw again after the tubular base extrusion modling.

Described subsequent treatment comprises annealing, japanning, solidifies operations such as processing, inspection, packing, and actual requirement is selected to carry out according to sheet material, and is concrete identical with pair rolling subsequent treatment operation.

A kind of magnesium alloy plate manufacturing process of the present invention compared with the prior art, it is as follows to have substantive technical characterstic and a remarkable result:

(1) simplifies operation and technical process, increased the passage rolling reduction, reduced rolling pass, reduced production cost;

(2) can obtain the large-sized plates material, board quality is good, and good mechanical performance has reduced anisotropy, has improved the sheet material secondary workability;

(3) roll forming improves, and has reduced the control of process parameters requirement, has improved the sheet material lumber recovery.

In a word, improve the magnesium alloy rolling formability, to obtain various sizes, good mechanical performance, sheet material that secondary forming is good, improve lumber recovery, reduce production costs, core is to have solved the rolling urgent need of magnesium alloy plate and insoluble problem.

Description of drawings

Fig. 1 is magnesium alloy plate forming technology schematic diagram.

The specific embodiment

Be elaborated with regard to the specific embodiment below in conjunction with accompanying drawing

Shown in Figure 1, magnesium alloy plate forming technology flow chart of the present invention.A kind of magnesium alloy plate manufacturing process comprises following several concrete operation:

1,---base---------the tubular base of extruding distinguish is cut and is rolled in heating by flattening---hot rolling---finished product to comprise operation: blanking;

2,---------the tubular base of extruding distinguish---flattens---hot rolling---cold rolling---pickling---finish rolling---finished product is cut and rolled---subsequent treatment to base in heating to comprise operation: blanking.

3,------------sawing---flattens---hot rolling---finished product is cut and rolled---subsequent treatment to base to push tubular base in heating to comprise operation: blanking.

4,------------sawing---flattens------pickling---finish rolling---finished product is cut and rolled---subsequent treatment that hot rolling is cold rolling to base to push tubular base in heating to comprise operation: blanking.

Described extruding is previously prepared magnesium alloy blank to be squeezed into the extruded tube of setting diameter, setting wall thickness, and forms the tubular base of distinguish after the axial sawing of extruded tube; Wherein: the tubular base of distinguish also can directly push and form.

The distinguish number of the tubular base of described distinguish is determined that by the required width of slab of the tubular base diameter of setting, follow-up flattening the thickness of the tubular base of distinguish is determined by required sheet metal thickness, default rolling reduction.

Described flattening is the tubular base of distinguish to be flattened make slab, and as rolling blank; Rolling is hot rolling, cold rolling and finish rolling, by the hot rolling of different passages, cold rolling and finish rolling, the slab that flattens is rolled into the sheet material of desired thickness, and wherein cold rolling, finish rolling is required to determine whether to adopt by sheet material.

Its rolling direction is namely sent the hot rolling slab in hot-rolling mill perpendicular to the flow direction of extrusion metal perpendicular to the flow direction of extrusion metal in described hot rolling, the cold rolling and finish rolling.

Subsequent treatment comprises annealing, japanning, solidifies operations such as processing, inspection, packing, and actual requirement is selected to carry out according to sheet material, and is concrete identical with pair rolling subsequent treatment operation.

Use example:

The one-tenth of AZ31 magnesium alloy plate, sheet material specification 1000 * 800 * 2.

1, blanking

Choose through the AZ31 alloy of the Ф of Surface Machining 340mm casting rod, the bar of sawing Ф 340 * 300mm carries out removing surface as blank to blank, and institute on the blank is jagged, greasy dirt, magnesium chips and other foul are removed.

2, base

The bar of Ф 340 * 300mm, after 410 ℃ * 18h homogenising was handled, jumping-up was compressed to external diameter Ф 500mm under homogenization temperature, then towards Ф 300mm hole, makes the hollow blank of Ф 500 * Ф 300 * 400mm.

3, push tubular base

The hollow blank of preparation is squeezed into the 2 lobe pipes of external diameter Ф 500mm, internal diameter Ф 460mm, 380 ℃ of blank temperatures, 320 ℃ of mold temperatures.

4, sawing

Along distinguish pipe (namely perpendicular to the direction of extrusion) sawing length 800mm radially.

5, flatten

Every lobe pipe is flattened, make 800 * 730 * 20 slab.

6, hot rolling

Rolling direction is perpendicular to the direction of extrusion (namely send perpendicular to the direction of extrusion and send slab to), 300～420 ℃ of rolling temperatures, every time reduction ratio 10～30%, mill speed 10～30m/min.

7, cold rolling

About percentage pass reduction 5%, pickling, finish rolling, finished product cut that operation such as to roll identical with pair rolling.

8, subsequent treatment

Subsequent treatment comprises annealing, japanning, solidifies operations such as processing, inspection, packing.For the AZ31 magnesium alloy plate, adopted 200 ℃, 1h annealing process, improve plasticity to eliminate work hardening, be beneficial to the secondary operations moulding.Other subsequent treatment operation is determined according to actual conditions and demand, and is concrete identical with the pair rolling postprocessing working procedures.

Above present embodiment just further specifies of the present invention, rather than any restriction that the present invention is made.

Claims

1. magnesium alloy plate manufacturing process comprises operation: blanking---base---heating---hot rolling, or also comprise operation: cold rolling---pickling---finish rolling---finished product is cut and rolled---subsequent treatment; It is characterized in that: before described hot-rolled process, also have previously prepared magnesium alloy blank extrusion molding is set diameter, set the tubular base of wall thickness, and after flattening, made the operation of hot rolling slab by tubular base; Tubular base diameter is determined that by the required width of hot rolling slab of follow-up flattening the thickness of tubular base is determined by required sheet metal thickness and default hot rolling deformation amount; Described rolling direction is namely sent the hot rolling slab in hot-rolling mill perpendicular to the flow direction of extrusion metal perpendicular to the flow direction of extrusion metal.

2. a kind of magnesium alloy plate manufacturing process according to claim 1 is characterized in that: the tubular base of distinguish that described tubular base is extrusion molding.

3. a kind of magnesium alloy plate manufacturing process according to claim 1 is characterized in that: the tubular base of distinguish that is cut into along the extruded tube radial saw again behind the described tubular base extrusion molding.