CN101474633A

CN101474633A - Tandem rolling equipment with different roller diameters for magnesium alloy thin coiled stock

Info

Publication number: CN101474633A
Application number: CNA2009100770871A
Authority: CN
Inventors: 蔡庆伍; 孟强; 胡水平; 魏松波
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 2009-01-20
Filing date: 2009-01-20
Publication date: 2009-07-08
Anticipated expiration: 2029-01-20
Also published as: CN101474633B

Abstract

The invention relates to thin magnesium alloy strip coil continuous rolling equipment with different roller diameters. The equipment is realized by the method comprising designing and manufacturing a rolling system consisting of four rollers with reducing roller diameters and two frames; a roller gap is formed between the two rollers with similar roller diameters in the system, and the four rollers press the rolled piece three times during a continuous rolling process. Meanwhile, temperature compensating devices are arranged above and below a rolling mill to provide a constant-temperature rolling space. Furthermore, the temperature compensating device is arranged between crimpers on two sides of the rolling mill, the crimper in a rolling inlet direction and an inlet of the rolling mill, thus the rolled piece is in the constant-temperature space during the whole rolling process, then is taken into the crimper with a heating device and subject to thermal treatment after being rolled. The rollers with the different roller diameters cause stress on an upper surface and a lower surface of a strip material to be asymmetrical and cause a rolled piece to produce shear strain during the rolling process, thus reducing texture of a base surface of a plate strip, refining crystal grains and improving stamping property thereof. In conclusion, the system combines the advantages of constant temperature control, rolling with different roller diameters, continuous rolling and the like, which greatly improves production efficiency of the magnesium alloy plate strip rolling, appearance of products and stamping property of the products.

Description

A kind of tandem rolling equipment with different roller diameters for magnesium alloy thin coiled stock

Technical field

It is rolling to the present invention relates to magnesium alloy thin coiled stock, also can be used for the rolling of other difficult deformable metal roll coil of strip.

Background technology

Magnesium alloy is the lightest in numerous structural metallic materials that people use, it also has high specific strength and specific stiffness, advantages of favorable electromagnetic shielding effect, good good, advantages such as damping shock absorption is good, easy recovery of machinability, heat conduction, in industries such as automobile, electronics, Aero-Space, communication, household electrical appliances for many years applicating history has been arranged, be described as 21 century green metal engineering material, have very wide application prospect.The gross reserves of magnesium is abundant on the earth, and China is one of the abundantest country of magnesium resource in the world, and this develops magnesium for us and magnesium alloy provides good condition.

The crystal of most of magnesium alloys all is a close-packed hexagonal structure, can only realize distortion by basal slip and the conical surface are twin when temperature is lower than 498K, and therefore, magnesium alloy plasticity when temperature is low is poor, and is easy to generate stress and concentrates and make the product cracking.Magnesium alloy plate and belt production at present mainly adopts the single chassis multi-pass rolling, need reheat between passage, and production efficiency is low, unstable product quality.Two surface stresses of magnesium alloy plate and belt are identical during pair rolling, roll the back and produce very strong basal plane texture, and the basal plane texture intensity can strengthen along with the increase of deformation extent.The strong basis plane texture can produce very adverse influence to the post forming of magnesium alloy plate and belt, and therefore, the control of strip texture has great importance, and how to weaken basal plane texture effectively and realizes that high efficiency production is the important topic of magnesium alloy research field.

Summary of the invention

The present invention is difficult to realize high efficiency constant temperature continuous rolling in order to solve magnesium alloy, the strong difficult point of pair rolling product basal plane texture in the operation of rolling.

Principle of the present invention is by selecting the different rolls in many rollers footpath for use, make magnesium alloy board by roll gap the time, and two surfaces are subjected to different stress and produce inhomogeneous deformation, thereby weaken the basal plane texture intensity that rolls the back strip.Existingly studies confirm that in a large number asymmetrical rolling can reduce draught pressure and energy consumption significantly, reduce rolling pass and rolling process, can obviously improve milling train and roll thin ability and can improve template again, improve precision.Therefore, the present invention utilizes the characteristics of asymmetrical rolling, can significantly improve magnesium alloy board production efficiency, surface quality of products, suppresses magnesium alloy board basal plane texture intensity, thereby improves its properties for follow.

The present invention mainly comprises the roll in four different rollers footpaths, and two frames and the frame attemperator of both sides are up and down formed.The arrangement mode of roll is: roll 1, roll 2 is vertically arranged, roll 2, roll 3 is horizontal, roll 3, roll 4 is vertically arranged, and roll 1, roll 2, roll 3, roll 4 rollers footpath reduces successively, roll 1, depressing by the screwdown gear that is located on the roll 1 between the roll 2 regulated, roll 2, depressing by the screwdown gear that is located at roll 3 right sides between the roll 3 regulated, roll 3, depressing by the device that is located at roll 4 belows between the roll 4 regulated, roll 1, roll 2, roll 3 is in the L type frame 5 of an integral body, the roll 3 that frame 6 connects in roll 4 and the frame 5 becomes complete rolling system; Summit, upright frame right side, the horizontal frames upside of L type frame 5 have set up temperature compensation means between the summit, between the summit, lower-left of L type frame summit, 5 lower left corner and vertical frame 6 of arranging same temperature compensation means is set also, above-mentioned stream oriented device makes rolled piece and roll cross the space that intermediate range is in a Controllable Temperature rolling, reload temperature compensation arrangement between the crimping machine of milling train both sides, the crimping machine of going into to roll direction enter the mouth to milling train.In the whole operation of rolling, band all is in by within 12,13,14 temperature compensation means that constitute, and is rolling to realize constant temperature.

Another technical scheme of the present invention is that any in above-mentioned roll (1), roll (2), roll (3) and the roll (4) drives more than 2 or 2, four rolls can be designed to drive, realize that reducing is rolling synchronously, also can be by motor speed is controlled, realize asymmetrical rolling, can also adopt adjacent two rolls to use different compound mode such as same motor-driven to realize the rolling of different modes, to reach the needs of control product tissue and performance.

Description of drawings

Fig. 1 is used to have the rolling tandem rolling equipment with different roller diameters for magnesium alloy thin coiled stock schematic diagram of constant temperature.

The specific embodiment

Embodiment 1:

As shown in Figure 1,1,2,3,4 is roll, and 5,6 is frame, and 7,8,9 is screwdown gear, and 10 is bearing, and 11 is jewel, and 12,13,14 is temperature compensation means, and 15 is crimping machine, and 16 is band, and 17 is roll balance gear.Depressing by the screwdown gear 7 that is located on the roll 1 between roll 1, the roll 2 regulated, depressing by the screwdown gear 8 that is located at roll 3 right sides between roll 2, the roll 3 regulated, depressing by the screwdown gear 9 that is located at roll 4 belows between roll 3, the roll 4 regulated, and four rolls and two frames are formed complete reducing four roller continuous-rollings.

Adopt in the operation of rolling of a motor-driven roll 2, roll 3, after band heats in the crimping machine 13 that has temperature compensation means, process is by 14 keeping warmth spaces that constitute, between 1,2 rolls, nip, because No. 2 roll diameter of roller are less than No. 1, band is with downsagging when shutting out, it is rolling to continue to enter 2,3 roll gap, No. 3 roll diameter of roller are less than No. 2, therefore, stick up when band shuts out to 3, No. 4 roller gaps, finally between 3,4 rolls, finish the whole operation of rolling, enter the crimping machine that has temperature compensation means and continue insulation.In addition, temperature compensation means 12 is installed, can also compensates the temperature loss of roll, thereby guarantee stable, continuous rolling of milling train for band provides a constant temperature space in the operation of rolling in the milling train above and below.

Embodiment 2:

Adopt 2 motors, one motor-driven roll 1, roll 2, another motor-driven roll 3, roll 4, needs according to actual rolling mill practice, regulate motor speed, the rotational line speed that makes roll 3 is with the linear velocity of certain ratio less than roll 2, in this operation of rolling, band is in having the crimping machine of temperature compensation means after (among the figure 13) heating, through by 14 keeping warmth spaces that constitute, 1, nip between 2 rolls, the linear velocity of No. 2 rolls and diameter are all less than No. 1 roll, therefore, when shutting out, band, continues to enter 2 with downsagging, 3 roll gap are rolling, the linear velocity of No. 3 rolls and diameter are all less than No. 2 rolls, when shutting out, band sticks up to 3, No. 4 roller gaps are finally 3, finish the whole operation of rolling between 4 rolls, enter the crimping machine that has temperature compensation means and continue insulation.The temperature control of this rolling deformation process is identical with embodiment 1.

Embodiment 3:

Adopt a motor-driven roll 1, roll 3, after band heats in the crimping machine 13 that has temperature compensation means, through keeping warmth space 14, between 1,2 rolls, to nip, No. 2 roller diameters are less than No. 1 roll, when band shuts out with downsagging, it is rolling to continue to enter 2,3 roll gap, and No. 3 roller diameters stick up when band shuts out to 3, No. 4 roller gaps less than No. 2 rolls, finally between 3,4 rolls, finish the whole operation of rolling, enter the crimping machine that has temperature compensation means and continue insulation.

Claims

1, a kind of tandem rolling equipment with different roller diameters for magnesium alloy thin coiled stock, comprise roll, frame, screwdown gear, it is characterized in that: roll (1), roll (2) is vertically arranged, roll (2), roll (3) is horizontal, roll (3), roll (4) roller is vertically arranged, and roll (1), roll (2), roll (3), roll (4) roller footpath reduces successively, roll (1), depressing by the screwdown gear that is located on the roll (1) between the roll (2) regulated, roll (2), depressing by the screwdown gear that is located at roll (3) right side between the roll (3) regulated, roll (3), depressing by the device that is located at roll (4) below between the roll (4) regulated, roll (1), roll (2), roll (3) is in the L type frame (5) of an integral body, frame (6) is vertically arranged, connect the roll (3) in roll (4) and the frame (5), become complete rolling system; Summit, upright frame right side, the horizontal frames upside of L type frame (5) set up temperature compensation means between the summit, also set up same temperature compensation means between the summit, lower-left of L type frame (5) summit, the lower left corner and vertical frame (6) of arranging, make the operation of rolling be in the space of a Controllable Temperature, the crimping machine of milling train both sides, go into to roll the crimping machine of direction to reload temperature compensation arrangement between the milling train inlet.

2, a kind of tandem rolling equipment with different roller diameters for magnesium alloy thin coiled stock according to claim 1 is characterized in that: any driving more than 2 or 2 in described roll (1), roll (2), roll (3) and the roll (4).