CN1109587C

CN1109587C - Tandem rolling technology and equipment of semi-solid metal material

Info

Publication number: CN1109587C
Application number: CN00105808A
Authority: CN
Inventors: 康永林; 胡林; 宋仁伯; 杨雄飞; 毛卫民
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 2000-04-07
Filing date: 2000-04-07
Publication date: 2003-05-28
Anticipated expiration: 2020-04-07
Also published as: CN1317378A

Abstract

The present invention provides a tandem rolling technology and equipment for semi-solid metal materials, and multiple rolling mills are provided according to needs. Metal semisolid pulp electromagnetically stirred is conveyed in a diversion pipe, and then, the semisolid pulp directly enters a rolling area from the upper parts of rolling mills in the vertical direction. In the rolling area, the rolling mills are arranged into three sections comprising a vertical section, a fan-shaped section and a horizontal section, which enables the pulp to be continuously rolled through multiple rolling mills. The equipment designed by the technology is mainly composed of multiple two-roller rolling mills, a guiding device, a cooling device, etc., and a pulp stirrer and the rolling mills are arranged vertically up and down. The present invention can achieve the propose that the semisolid metal can be stably controlled to be continuously rolled, and the size range and varieties of products are enlarged. The present invention has the advantages of low production cost, simple equipment structure and convenient maintenance and operation.

Description

Semi-solid metal continuous rolling process and equipment

Technical field: it is rolling to the invention belongs to semi-solid metal, particularly the continuous rolling of semi-solid steel materials.

Background technology: the roll forming of semi-solid metal is a technology of new development over nearly 20 years, because it is rolling that this technology can reach nearly end form, enhance productivity, enlarge product scope, therefore have wide industrial foundation and potentiality, but this progressive forming process, existing certain difficulty aspect the conveying of semi solid slurry, influenced it and used, made the semi-solid rolling shaping of metal material mainly concentrate on low melting material aspects such as aluminium alloy, magnesium alloy, metal, copper alloy.Although being the research of high-temperature steel iron material semi-solid rolling, the research of low melting material semi-solid rolling established certain basis, because ferrous materials exists (1) solidus and liquidus temperature interval less; (2) two-phase section temperature height, semi solid slurry is difficult to prepare continuously and stably; (3) ratio of the temperature of slurry, solid phase and distribution are difficult to accurate control; (4) slurry is carried and the insulation difficulty at high temperature; (5) forming temperature height, the high-temperature behavior of tool materials is difficult to problems such as assurance, and makes semi-solid rolling more difficult.According to Proceedings of The 3rdInternational Coference on Processing of Semi-Solid Alloys and Composites and Proceedings of The 4 ^ThRelevant bibliographical informations such as International Conference on Processing of Semi-SolidAlloys and Composites, Japan since the nineties, the U.S., state such as Britain and Korea S has carried out a large amount of research to the semi-solid rolling of ferrous materials, its rolling mill practice is that semi-solid blank is heated to the semi-molten state, carry out the rolling of monolithic blank, if solid rate too high (more than 70%) during heating, its distortion is basic identical with hot rolling, if solid rate lower (below 70%), then the liquid-solid phase distortion is wayward, makes the operation of rolling and unstable product quality.They test the milling train that is adopted and are generally single chassis, and the material that rolls of examination is mainly low-melting-point metal and stainless steels such as aluminium alloy, and rolling product is a thin plate, and not only the size range of product is little, and product is single.

Summary of the invention: the objective of the invention is to, overcome above-mentioned semi-solid blank energy consumption high and heating blank solid rate and the operation of rolling and the unstable product quality problem of heating rolling again, propose a kind ofly semi-solid metal slurry is directly sent into mill roll-gap to realize the direct continuous rolling of slurry, carry and multimachine frame rolling realization stablizing controlled rolling process and rolled piece quality by the semi solid slurry solid rate is stable, and device structure is simple, and maintenance operation is convenient.

In this rolling mill practice, obtain even tissue, metal semi-solid slurry that crystal grain is tiny by electromagnetic agitation or electromagnetism and the compound stirring of vibration, semi solid slurry through the slurry mozzle directly vertically, be delivered to the first rolling mill porch from milling train top, and enter the roll forming of rolling deformation district by guide and guards.Semi solid slurry enters following frame while cooling off and continues rolling deformation behind the first rolling mill rolling deformation.Milling train is arranged to three sections of vertical sections, fan-shaped section, horizontal segment, makes slurry carry out continuous rolling by the multimachine frame.

Adopt the designed equipment of this technology mainly to form by many duo mills, guide plate 3 and hollow roll 4, slurry mixer and slurry mozzle 2 adopt upper and lower being arranged vertically with milling train, four columns constitute rack framework 8, rack framework 8 is the overall architectures of laying two or many rolling mills, every rolling mill by be connected rack framework 8 on inboard one section about two rectangular slabs 13 support.The roll of first rolling mill is a hollow roll 4, and 10, the second each later rolling mill rolls of water spray cooling water pipe are housed in inside is solid roller 5.

The present invention has adopted the less mozzle of size, it is few that slurry is dispelled the heat in course of conveying, flow resistance is little, at high temperature resistance of deformation is little owing to semi-solid metal again, even tissue, crystal grain is tiny, no dendrite and segregation, rely on the gravity of self vertically to enter rolling district, rolling so can realize smoothly nipping with large deformation, realize stablizing controlled rolling, remarkable shortened process, produce the difficult property of producing of some present hot rollings and the product of special shape, reduced to produce consuming and cost thus, improved production efficiency and enlarged product scope.

Description of drawings

Fig. 1 is a semisolid continuous rolling process flow chart

1 semi solid slurry

2 slurry mozzles

3 guide plates

4 hollow rolls

5 solid rollers

Fig. 2 is a semisolid equipment for continuously rolling structure diagram

6 depress spiro rods

7 balancing springs

8 rack frameworks

9 bearing block memorial archways

10 cooling water pipes

11 pressure heads

12 bearing blocks

13 rectangular slabs

Fig. 3 is the microstructure of electromagnetic agitation semisolid 60Si2Mn.

Fig. 4 is the microstructure of routine casting 60Si2Mn.

Fig. 5 be semisolid 60Si2Mn at 1400 ℃, e=0.4, under the condition of ε=0.5 distortion after tissue.

Fig. 6 be routine casting 605i2Mn at 1400 ℃, e=0.4, under the condition of ε=0.5 distortion after tissue.

Fig. 7 is that 60Si2Mn semisolid and routine casting material are at solid-liquid two-phase section trus stress-strain curve (T=1420 ℃, e=0.5)

The specific embodiment:

Through the 60Si2Mn semi solid slurry after stirring, flow into the milling train of vertical placement with agitator by slurry mozzle 2 and guide plate 3, utilize the manual or electronic adjusting gap values between rollers of depressing, promote the size that pressure head 11 changes roll gap by depress spiro rod 6, when semi solid slurry 1 enters first rolling mill, semi solid slurry solidifies substantially, but temperature is very high, the rolling deformation drag is low, therefore require the thermal conductivity of roll good, adopt hollow roll 4, hollow roll is by the cooling of spraying water of the cooling water pipe 10 of inside, when the bigger cooling velocity of needs, the mode that can also adopt inside and outside cooling to carry out is simultaneously controlled the temperature of rolled piece and roll.When rolled piece entered second rolling mill, because cooling, rolled piece major part solidified, and temperature is near hot-rolled state, and resistance of deformation increases, and therefore each later rolling mill of second rolling mill adopts solid roller 5 to carry out continuous rolling.

60Si2Mn semisolid tandem rolling is compared with the technology of routine casting, has following characteristics:

1, the microstructure of electromagnetic agitation semi-solid blank and routine casting 60Si2Mn compares, the refinement of smart grain, even tissue.

From Fig. 3 and Fig. 4 as can be seen, the dendrite of routine casting material is very flourishing, and through tiny, the even tissue of semi-solid blank crystal grain of electromagnetic agitation.Fig. 5 and Fig. 6 show, when solid-liquid two-phase region is out of shape, and the even tissue after the semi-solid blank distortion, and organizing of routine casting is extremely inhomogeneous, also have a large amount of pine-tree structures.

2,60Si2Mn semi-solid blank and routine casting material compare in solid-liquid two-phase section resistance of deformation, and resistance of deformation is little.

As can be seen from Figure 7, when solid-liquid two-phase region was out of shape, the semi-solid blank resistance of deformation was significantly less than the resistance of deformation of routine casting blank.

Claims

1, a kind of semi-solid metal continuous rolling process, it is characterized in that, the metal semi-solid slurry that even tissue, the crystal grain that the compound stirring of electromagnetic agitation or electromagnetism and vibration obtains is tiny passes through the slurry mozzle directly vertically, be delivered to the first rolling mill porch from milling train top, and enter the rolling deformation district by guide plate, semi solid slurry is behind the first rolling mill rolling deformation, enter following frame while cooling off and continue rolling deformation, milling train is arranged to three sections of vertical sections, fan-shaped section, horizontal segment, and slurry carries out continuous rolling by the multimachine frame.

2, a kind of semi-solid metal equipment for continuously rolling, it is characterized in that, equipment for continuously rolling mainly is made up of many duo mills, guide plate (3), wherein the roll of first rolling mill is a hollow roll, slurry mixer and slurry mozzle (2) adopt upper and lower being arranged vertically with milling train, four columns constitute rack frameworks (8), and rack framework (8) is the overall architecture of laying two or many rolling mills, every rolling mill by be connected on inboard one section of the rack framework (8) about two rectangular slabs (13) support.

3, semi-solid metal equipment for continuously rolling according to claim 2 is characterized in that, water spray cooling water pipe (10) is housed in the inside of the first built on stilts heart roll (4), and second each later rolling mill roll is solid roller (5).