CN101648210A - Processing method for rolling magnesium alloy plate with low temperature, high speed and large processing amount - Google Patents

Abstract

The invention relates to a processing method for rolling magnesium alloy plates with low temperature, high speed and large processing amount, which is on the basis of the traditional medium plate hotrolling production technology, wherein the traditional medium plate hot rolling production technology includes he steps as follow: ingot casting (billet flattening), face milling (edge milling), flawdetection, uniformization processing, heating, hot rolling, straightening, saw cutting, surface processing, detection and oiling package slab ingot heating. The processing method for rolling magnesiumalloy plates with low temperature, high speed and large processing amount is characterized by adopting a method for controlling rolling temperature, rolling speed (in particular final rolling temperature and speed), the rolling reduction of each pass, the passes between 8 and 10 and the interval time and the cooling speed of pass deformation aiming at the hot rolling technology in the technologyto control the grain size of the magnesium alloy hot rolling plates so as to enhance the comprehensive mechanical property, also design and optimize the deformed magnesium alloy medium plate production technology again and regenerate the technology process.

Description

The processing method of the big processing capacity rolling deformation of low-temperature and high-speed magnesium alloy plate

Technical field:

The present invention relates to non-ferrous metal processing, relate to the process of the big processing capacity rolling deformation of a kind of low-temperature and high-speed magnesium alloy cut deal material.

Background technology:

Magnesium alloy has advantages such as density is low, specific strength is high, damping capacity is good, the electromagnetic shielding ability is strong, has great application prospect aspect the structural member in fields such as space flight and aviation, the vehicles, telecommunications, is described as " metal material of 21 century ".But owing to adopt the processes passage of the magnesium alloy cut deal of traditional hot roll process production generally to reach more than 13, ingot casting heating and rolling temperature are higher, wrought magnesium alloy sheet material comprehensive mechanical performance is relatively poor, and production capacity is low, greatly limited promoting the use of of wrought magnesium alloy hot rolled plate, so the research of high-performance magnesium-alloy rolled plate has in recent years become one of heat subject both at home and abroad with being applied in.

Summary of the invention:

Be directed to above-mentioned situation, the present invention heats a hot rolling at the slab ingot of traditional ingot casting (slab) → mill face (milling the limit) → flaw detection → homogenising processing → heating → hot rolling → aligning → sawing → surface treatment → detection → oiling packing and produces on the technology basis of cut deal, be characterized in adopting the controlled rolling temperature at the hot rolling technology in the technology, mill speed (especially finishing temperature and speed) and every time drafts, passage is controlled between 8～10, the blanking time between each passage distortion and the method for cooling velocity, the grain size of controlling the magnesium alloy hot rolled plate reaches the purpose that improves its comprehensive mechanical property, wrought magnesium alloy Heavy Plate Production technology has been carried out redesign and optimized, realized that its technological process reproduces.

For achieving the above object, the present invention adopts following technical scheme:

1, ingot casting is prepared: ingot casting is milled face and mills limit, flaw detection and homogenising processing: heating-up temperature: 400～450 ℃, and heat time heating time: 22～24h.

2, ingot casting heating: heating-up temperature: 420～450 ℃, heat time heating time: 7～8h.

3, hot rolling: comprising: start rolling temperature, rolling pass, pass reduction, mill speed and finishing temperature are selected; Wherein:

Start rolling temperature: 350～420 ℃ (traditional start rolling temperature is 420～480 ℃);

Rolling pass: be controlled at 7～10;

Pass reduction: factors such as the bite condition of previous three passes consideration slab ingot, cast sturcture adopt less pass reduction, pony-roughing pass adopts higher pass reduction 30～42% (the maximum pass reduction of traditional handicraft is no more than 28%), and the last pass working modulus is controlled at 16～25%;

Mill speed: mill speed is controlled between 0～3m/s, previous three passes adopts lower mill speed, can adopt higher mill speed according to rolled piece temperature and pass reduction in the operation of rolling, finish to gauge speed is guaranteeing to adopt higher temperature under the condition that required finishing temperature and rolled piece do not split as far as possible;

Finishing temperature: be controlled at (traditional finishing temperature is positioned at 350～420 ℃) between 280～350 ℃.

4, aligning: utilize the waste heat that rolls the back material to align, temperature is not less than 150 ℃.The aligning number of times is not higher than 3 times as far as possible.

5, sawing: carry out sawing according to product specification at normal temperatures.

6, surface treatment: can adopt physics or chemical method to carry out surface treatment.

7, detect: mechanical performance detects.

8, oiling packing: finished product is carried out oiling packing warehouse-in.

Beneficial effect:

Technical solution of the present invention is by adopting the working modulus that strengthens pony-roughing pass in hot rolling, realize low-temperature and high-speed rolling deformation magnesium alloy plate, compare with traditional handicraft, significantly reduced rolling pass, reduced cost, improved production capacity 25% or more, raising alloy comprehensive mechanical performance; The mechanical performance of rolling wrought magnesium alloy sheet material can reach: Rm=260～300Mpa, Rp _0.2=170～205MPa, Rp _-0.2=85～105, A=18～23%.

Adopt the specific embodiment to further specify below:

Embodiment 1:

In conjunction with trade mark AZ41M, the hot rolled plate production of product specification 13mm * 1000mm * 2000mm is that example describes.

Its concrete production method is as follows:

1, ingot casting is prepared: to ingot casting (specification: 200mm * 800mm) mill face and mill the limit (165mm * 760mm), flaw detection and homogenising are handled: heating-up temperature: 400 ℃, heat time heating time: 22h;

2, ingot casting heating: heating-up temperature: 450 ℃, heat time heating time: 8h;

3, hot rolling: start rolling temperature: 350 ℃, mill speed is controlled between 0～3m/s, and rolling parameter sees the following form:

Rolling pass	Ingoing ga(u)ge/mm	Outgoing gauge/mm	Drafts/mm	Pass reduction/%	Mill speed/m/s	Rolling temperature/℃
							??1	??165	??147	??18	??10.91	??0.5
??2	??147	??125	??22	??14.97
							??3	??125	??100	??25	??20.00
??4	??100	??72	??28	??28.00
							??5	??72	??50	??22	??30.56
??6	??50	??34	??16	??32.00
							??7	??34	??24	??10	??29.41
??8	??24	??17	??7	??29.17
							??9	??17	??13	??4	??23.53	??2	Control is temperature 280 eventually

4, aligning: utilize the waste heat that rolls the back material to align, temperature is not less than 150 ℃.Aligning number of times 3 times;

5, sawing: carry out sawing according to product specification 1000mm * 2000mm at normal temperatures;

6, surface treatment: adopt the method for physics sanding to carry out surface treatment;

7, detect: mechanical performance reaches Rm=298Mpa, Rp _0.2=203MPa, A=20%;

8, oiling packing: finished product is carried out oiling packing warehouse-in.

Embodiment 2:

In conjunction with trade mark AZ41M, the hot rolled plate production of product specification 28mm * 750mm * 2500mm is that example describes: its concrete production method is as follows:

1, ingot casting is prepared: to ingot casting (specification: 200mm * 800mm) mill face, mill the limit (165mm * 760mm), flaw detection and homogenising are handled: heating-up temperature: 450 ℃, heat time heating time 24h;

2, ingot casting heating: 420 ℃ of temperature, heating 7h;

3, hot rolling: start rolling temperature: 420 ℃, mill speed is controlled between 0～3m/s, and rolling parameter sees the following form:

Rolling pass	Ingoing ga(u)ge/mm	Outgoing gauge/mm	Drafts/mm	Pass reduction/%	Mill speed/m/s	Rolling temperature/℃
							??1	??165	??147	??18	??10.91
??2	??147	??125	??22	??14.97
							??3	??125	??98	??27	??21.60
??4	??98	??68	??30	??30.61
							??5	??68	??47	??21	??30.88
??6	??47	??34	??13	??27.66
							??7	??34	??28	??6	??17.65		Finishing temperature 350

4, aligning: utilize the waste heat that rolls the back material to align, temperature is not less than 150 ℃.Aligning number of times 2 times;

5, sawing: carry out sawing according to product specification 750mm * 2500mm at normal temperatures;

6, surface treatment: adopt the method for physics sanding to carry out surface treatment;

7, detect: mechanical performance reaches Rm=292Mpa, Rp _0.2=200MPa, Rp _-0.2=102, A=23%;

8, oiling packing: finished product is carried out oiling packing warehouse-in.

Embodiment 3:

In conjunction with trade mark AZ31B, the hot rolled plate production of product specification 10mm * 750mm * 2000mm is that example describes: its concrete production method is as follows:

Ingot casting is prepared, ingot casting heats as mentioned above;

Hot rolling: start rolling temperature, mill speed as mentioned above, rolling parameter sees the following form:

Rolling pass	Ingoing ga(u)ge/mm	Outgoing gauge/mm	Drafts/mm	Pass reduction/%	Mill speed/m/s	Rolling temperature/℃
							??1	??165	??147	??18	??10.91
??2	??147	??128	??19	??12.93
							??3	??128	??105	??23	??17.97
??4	??105	??80	??25	??23.81
							??5	??80	??47	??33	??41.25
??6	??47	??32	??15	??31.91
							??7	??32	??22	??10	??31.25
??8	??22	??16	??6	??27.27
							??9	??16	??12	??4	??25.00
??10	??12	??10	??2	??16.67		Finishing temperature 290

Aligning, sawing, surface treatment, oiling are packed as mentioned above;

Detect: mechanical performance reaches Rm=265Mpa, Rp _0.2=174MPa, A=20%.

Claims (1)

1; The processing method of the big processing capacity rolling deformation of low-temperature and high-speed magnesium alloy plate, its process using: ingot casting, mill face and mill limit, flaw detection, homogenising processing, heating, hot rolling, aligning, sawing, surface treatment, detection, oiling packaging step; It is characterized in that: the hot rolling technology step, its selection comprises:

I, start rolling temperature: be controlled between 350～420 ℃;

II, rolling pass: be controlled between 7～10;

III, pass reduction: factors such as the bite condition of previous three passes consideration slab ingot, cast sturcture adopt less pass reduction, pony-roughing pass adopts higher pass reduction to be controlled between 30～42%, and the last pass working modulus is controlled between 16～25%;

IV, mill speed: mill speed is controlled between 0～3m/s, previous three passes adopts lower mill speed, can adopt higher mill speed according to rolled piece temperature and pass reduction in the operation of rolling, finish to gauge speed is guaranteeing to adopt higher speed under the condition that required finishing temperature and rolled piece do not split as far as possible;

V, finishing temperature: be controlled between 280～350 ℃.