CN105290108A - Magnesium alloy sheet strip coupling and deformation combined rolling system and rolling method thereof - Google Patents

Abstract

The invention relates to a magnesium alloy sheet strip coupled deformation combined rolling system and method thereof. The present invention mainly solves the technical problems of strong mechanical anisotropy of rolled magnesium alloy thin strips, serious defects of plate shape and edge cracks, low yield of finished product and low production efficiency of the equal-diameter angle rolling method existing in the traditional rolling process . The technical solution of the present invention is: a magnesium alloy sheet strip coupling deformation combined rolling system, which consists of two uncoiling-coilers, two five-roller shear bending large deformation adjustable devices, and two three-roller straightening machines , two pinch roll devices and a six-roll reversible rolling mill, the uncoiler-coiler, the five-roll shear bending large deformation adjustable device, the three-roll straightening machine and the pinch roll device are arranged in sequence in the six-roll reversible rolling mill The front and rear sides realize reciprocating rolling of magnesium alloy thin strips. The rolling method of the rolling system is as follows: the uncoiled magnesium alloy coils are sequentially rolled back and forth through the above-mentioned equipment until the final product rolling is stopped.

Description

A magnesium alloy thin strip coupled deformation combined rolling system and rolling method thereof

technical field

The invention relates to a magnesium alloy sheet strip coupled deformation combined rolling system and a rolling method thereof, belonging to a magnesium alloy sheet rolling equipment and a rolling method thereof.

Background technique

The traditional rolling production methods of magnesium alloy strips are mostly multi-pass continuous rolling or single-stand reciprocating rolling. Reciprocating rolling can greatly improve production efficiency. However, full longitudinal rolling results in strong mechanical anisotropy of the rolled magnesium strip, which makes subsequent deep processing difficult. Existing scholars have developed a method of equal-angle rolling, which is a method that can achieve continuous shear deformation. The rolling method can change the grain orientation of the magnesium alloy sheet from the basal orientation to the non-basal orientation, thereby providing more slip systems for the magnesium alloy and greatly improving its plastic deformation ability. The mechanical anisotropy of the magnesium plate after equal diameter rolling has been significantly improved. However, due to the rapid heat dissipation of the magnesium alloy, it needs to be returned to the furnace for reheating after each pass of rolling. At the same time, due to the special process of the equal-diameter angle, continuous rolling or reversible reciprocating rolling cannot be realized, which greatly restricts the production efficiency of the equal-diameter angle rolling. In addition, the sliding friction resistance of the mold during the shear deformation of the magnesium plate will lead to instability, wrinkling and crack defects. The magnesium plate is subjected to one-way bending of the mold, resulting in uneven distribution of residual stress on the magnesium plate after rolling, and it is easy to appear. Shaped waves and other defects.

Contents of the invention

The purpose of the present invention is to solve the problems of the traditional rolling process, such as strong mechanical anisotropy of the rolled magnesium alloy thin strip, serious shape and edge crack defects, low yield and low production efficiency in the equal-diameter rolling method. The problem is to provide a combined rolling system and rolling method of a magnesium alloy sheet strip coupled with deformation.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A magnesium alloy sheet strip coupled deformation combined rolling system, which consists of two uncoiler-coilers, two five-roll shear bending large deformation adjustable devices, two three-roll levelers, and two pinch roll devices It consists of a six-roll reversible rolling mill, the first uncoiler-coiler, the first five-roll shear bending large deformation adjustable device, the first three-roll straightening machine and the first pinch roll device are set in sequence In front of the six-high reversing rolling mill, the second pinch roll device, the second three-roll straightening machine, the second five-roll shear bending large deformation adjustable device and the second uncoiling-coiler are arranged in sequence. The rear side of the six-high reversing rolling mill realizes reciprocating rolling of magnesium alloy thin strips.

The two uncoiling-coilers, two five-roll shear bending large deformation adjustable devices, two three-roll levelers, two pinch roll devices and six-roll reversing mills are all equipped with temperature heating and temperature detection device.

A rolling method using the above-mentioned magnesium alloy sheet strip coupling deformation combined rolling system, which first uncoils the magnesium alloy strip coil preheated by the bell furnace through the first uncoiler-coiler, and the uncoiled magnesium alloy The alloy coils are pre-deformed before rolling through the first five-roller shearing and bending large-deformation adjustable device in the thickness direction of the plate, and the pre-deformed magnesium alloy coils enter the first three-roller straightening machine for straightening and straightening. The straightened magnesium alloy coil enters the six-high reversing rolling mill through the first pinch roll device for rolling, and the rolled magnesium alloy strip is sent to the second three-roll leveler through the second pinch roll device Perform re-straightening before crimping, then enter the second five-roller shear bending large deformation adjustable device for re-deformation after rolling, and finally enter the second uncoiler-coiler for coiling, when the first uncoiler - When the coil diameter detection device of the coiler detects the last 2 coils remaining, the equipment of the whole line stops and starts to run in reverse, and carries out the reverse rolling of the magnesium alloy coil until the finished product rolling is finally completed and stopped.

The five-roll shear bending large deformation adjustable device is composed of a two-roll pre-deformation unit that can move up and down and a fixed tower-shaped three-roll re-deformation unit, and the angle of the shear bending deformation can be adjusted by moving the two-roll pre-deformation unit up and down θ, θ ranges from 90° to 120°.

Because the present invention adopts the above-mentioned technical scheme, it solves the problems of strong mechanical anisotropy of the rolled magnesium alloy sheet strip, serious plate shape and edge crack defects, low yield and the existence of the equal-diameter angle rolling method in the existing rolling process. Technical problems of low production efficiency. Therefore, compared with background technology, advantage and progress that the present invention has are:

1) The five-roll shear bending large deformation adjustable device arranged before and after the rolling mill applies rolling pre-deformation and re-deformation to the plate. This coupling deformation method can effectively induce shear deformation, tensile twinning and dynamic recrystallization nucleation in the sheet, which is beneficial to control the microstructure and texture structure of the magnesium alloy, so as to weaken the basal texture, refine the grain, and reduce anisotropy. and plate waves, and crack defects.

2) The shear deformation is applied by the rotation of the tower-shaped three-roller re-deformation unit (rolling friction between the plate rolls), which effectively overcomes the instability of thin plate rolling caused by the sliding friction between the plate rolls at the deformed die of equal-diameter angular rolling , wrinkling and cracking defects.

3) The tower-shaped three-roller re-deformation unit adopts a multi-roller combination tower-shaped roller structure, which solves the structural problem that its rigidity and strength are low and cannot be supported by bearings.

4) The five-roll shear bending large deformation adjustable device effectively overcomes the micro-crack defects on the plate surface, grain refinement, texture type transformation and base surface weaving caused by the current asynchronous rolling of magnesium alloy plates due to inappropriate roll speed ratio matching. Insufficient structural weakening and other issues.

5) The present invention has both the high production efficiency of reversible rolling and the advantages of improving the anisotropy of the magnesium plate by equal-diameter rolling and overcomes the shortcomings of the two processes. The unification of reversible reciprocating rolling and equal angle rolling is realized, and the performance and production efficiency of the rolled magnesium plate are greatly improved.

Description of drawings

Fig. 1 is the structural representation of device of the present invention;

Fig. 2 is a structural principle diagram of the five-roll shear bending large deformation adjustable device of the present invention.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

As shown in Fig. 1 and Fig. 2, a kind of magnesium alloy sheet strip coupling deformation combined rolling system in the present embodiment, it is made up of two uncoiling-coilers 1,9, two five-roller shear bending large deformation can Adjusting device 2, 8, two three-roll straightening machines 3, 7, two pinch roll devices 4, 6 and six-roll reversing mill 5, the first uncoiling-coiler 1, the first five-roll shear Cutting and bending large deformation adjustable device 2, the first three-roll leveler 3 and the first pinch roll device 4 are sequentially arranged in front of the six-roll reversing mill 5, the second pinch roll device 6, the second A three-roll straightening machine 7, a second five-roll shear bending large deformation adjustable device 8 and a second uncoiler-coiler 9 are sequentially arranged behind the six-roll reversing mill 5 to realize reciprocating rolling of magnesium alloys Thin strip.

The two uncoiling-coilers 1, 9, two five-roll shear bending large deformation adjustable devices 2, 8, two three-roll straightening machines 3, 7, two pinch roll devices 4, 6 and The six-high reversing rolling mill 5 is equipped with temperature heating and temperature detection devices.

A rolling method using the above-mentioned magnesium alloy sheet strip coupled deformation combined rolling system, which first uncoils the magnesium alloy strip coil preheated by the bell-type heating furnace through the first uncoiling-coiler 1, and the uncoiled Magnesium alloy coils pass through the first five-roller shear bending large deformation adjustable device 2 to apply pre-deformation to the thickness direction of the plate before rolling, and the pre-deformed magnesium alloy coils enter the first three-roller straightening machine 3 for straightening Straightening, the straightened magnesium alloy coil enters the six-high reversing rolling mill 5 through the first pinch roll device 4 for rolling, and the rolled magnesium alloy strip is sent into the second pinch roll device 6 through the second pinch roll device 6 The first three-roller straightening machine 7 performs re-straightening before crimping, and then enters the second five-roller shear bending large deformation adjustable device 8 for re-deformation after rolling, and finally enters the second uncoiling-coiler 9 Coiling, when the first uncoiler-coiler coil diameter detection device detects the last 2 laps remaining, the entire line of equipment stops and starts to run in reverse to carry out reverse rolling of magnesium alloy coils until the final rolling of the finished product is completed. stop.

The above-mentioned five-roll shear bending large deformation adjustable devices 2 and 8 are composed of a two-roll pre-deformation unit that can move up and down and a fixed tower-shaped three-roll re-deformation unit, and the shear bending deformation can be adjusted by moving the two-roll pre-deformation unit up and down The angle θ, θ ranges from 90 to 120°.

Claims (5)

1. a magnesium alloy thin plate and band Coupling Deformation combination rolling system, it is characterized in that: it is by two uncoiling-coiling machines, two five roller shear-bow large deformation adjustable apparatus, two three-roll unbenders, two pinch roll apparatus and six roll reversing rollers composition, First uncoiling-coiling machine, First five roller shear-bow large deformation adjustable apparatus, First three-roll unbender and First pinch roll apparatus are sequentially arranged on the front of six roll reversing rollers, second pinch roll apparatus, second three-roll unbender, second five roller shear-bow large deformation adjustable apparatus and second uncoiling-coiling machine are sequentially arranged on the back of six roll reversing rollers, realize reciprocal rolling magnesium alloy thin plate and band.

2. magnesium alloy thin plate and band Coupling Deformation combination rolling system according to claim 1, is characterized in that: described two uncoiling-coiling machines, two five roller shear-bow large deformation adjustable apparatus, two three-roll unbenders, two pinch roll apparatus and six roll reversing rollers are all provided with heating temperatures and temperature-detecting device.

3. magnesium alloy thin plate and band Coupling Deformation combination rolling system according to claim 1 and 2, it is characterized in that: described five roller shear-bow large deformation adjustable apparatus are made up of two roller predeformation unit moving up and down and fixing turriform three roller redeformation unit, by the angle θ moving up and down adjustment shear-bow distortion of two roller predeformation unit, the scope of θ is 90 ~ 120 °.

4. one kind uses the milling method of the magnesium alloy thin plate and band Coupling Deformation combination rolling system described in claim 1, it is characterized in that: first by First uncoiling-coiling machine, the magnesium alloy strip coil after bell type heating furnace preheating is opened, magnesium alloy strip coil after uncoiling applies the predeformation before rolling by First five roller shear-bow large deformation adjustable apparatus to sheet metal thickness direction, the magnesium alloy strip coil of predeformation enters First three-roll unbender and aligns, magnesium alloy strip coil after aligning enters six roll reversing rollers via First pinch roll apparatus and is rolled, magnesium alloy strip after rolling is sent into second three-roll unbender via second pinch roll apparatus and is carried out curling front aligning again, enter afterwards second five roller shear-bow large deformation adjustable apparatus be rolled after redeformation, finally enter second uncoiling-coiling machine to batch, when First uncoiling-coiling machine tape coil diameter detection device detects that residue last 2 is enclosed, equipment stops completely, start antiport, carry out the reverse rolling of magnesium alloy strip coil, shut down until finally complete finished product rolling.

5. milling method according to claim 4, it is characterized in that: described five roller shear-bow large deformation adjustable apparatus are made up of two roller predeformation unit moving up and down and fixing turriform three roller redeformation unit, by the angle θ moving up and down adjustment shear-bow distortion of two roller predeformation unit, the scope of θ is 90 ~ 120 °.