KR101187247B1 - Rolling method for aluminium alloy sheet - Google Patents

Rolling method for aluminium alloy sheet Download PDF

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KR101187247B1
KR101187247B1 KR20100033541A KR20100033541A KR101187247B1 KR 101187247 B1 KR101187247 B1 KR 101187247B1 KR 20100033541 A KR20100033541 A KR 20100033541A KR 20100033541 A KR20100033541 A KR 20100033541A KR 101187247 B1 KR101187247 B1 KR 101187247B1
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South Korea
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aluminum alloy
roller
rolling
cross
rollers
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KR20100033541A
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Korean (ko)
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KR20110114101A (en
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이광진
전재열
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한국생산기술연구원
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  • Mechanical Engineering (AREA)
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Abstract

The present invention relates to a method for rolling an aluminum alloy sheet, comprising: a material retraction step of introducing an aluminum alloy material between an upper cross roller and a lower cross roller of a cross rolling mill provided with a plurality of upper cross rollers and a lower cross roller; It comprises a cross rolling step of rolling while passing through the upper cross roller and the lower cross roller, the upper cross roller and the lower cross roller is installed so that each center line cross each other, and inclined at a predetermined inclination angle to the normal line of the entry direction of the aluminum alloy material. Is installed.
In the aluminum alloy sheet rolling method according to the present invention, the aluminum alloy material is rolled by using rollers intersecting each other, so that not only the grains are refined in the aluminum alloy, but also β-fiber and random texture are formed to form an aluminum alloy sheet having excellent moldability. There is an advantage to manufacture.

Description

Rolling method for aluminum alloy sheet

The present invention relates to an aluminum alloy sheet rolling method, and more particularly, to an aluminum alloy sheet rolling method for rolling by passing an aluminum alloy material between the upper roller and the lower roller to cross each other.

In general, aluminum alloys have a weight of about one third of steel, but have an advantage of being superior to steel or having more excellent mechanical properties, depending on the addition of various alloying elements. Due to the above advantages, aluminum alloys are rapidly increasing their use in aircraft and automobile industries, which are expected to improve fuel efficiency through weight reduction.

 In particular, in today's automobiles, the design and development of parts are performed at the same time. In addition to shortening the assembly time and cost reduction, a plurality of unit parts are assembled into one assembly, that is, a module unit, and each assembly is finally combined. It is made in a modular way, the aluminum of the chassis module, which is very important for the ride comfort and safety of the vehicle among the various modules constituting the vehicle, and heavy weight is essential for light weight of the vehicle.

As an aluminum alloy used to reduce the weight of automobiles, an alloy of 6xxx series is mainly used. The 6xxx alloy has excellent extrudability, has age hardenability, good toughness and is suitable for deep processing.

However, aluminum alloys have a problem in that they are not suitable for use in automobile parts requiring excellent strength and formability due to their low strength and formability compared to steel.

An object of the present invention is to provide an aluminum alloy sheet rolling method for manufacturing an aluminum alloy sheet having excellent moldability by rolling an aluminum alloy sheet using cross rollers.

Aluminum alloy sheet rolling method according to the present invention for achieving the above object is a material for introducing an aluminum alloy material between the upper cross roller and the lower cross roller of the cross rolling mill provided with at least one upper cross roller and the lower cross roller. A pulling-in step and a cross-rolling step in which the aluminum alloy material is rolled while passing through the upper cross roller and the lower cross roller,

The upper cross rollers and the lower cross rollers are installed so that each center line crosses each other, and are inclined at a predetermined inclination angle at a normal line in the inflow direction of the aluminum alloy material.

In addition, a plurality of upper parallel rollers and lower parallel rollers are provided, wherein the upper parallel rollers and the lower parallel rollers have the cross-rolling step between the upper parallel rollers and the lower parallel rollers of the parallel rolling mill installed such that their respective center lines are parallel to each other. It is preferable to further include a parallel rolling step of pulling and rolling the finished aluminum alloy material.

According to another embodiment of the present invention, an aluminum alloy sheet rolling method includes at least one first roller unit and an upper parallel roller and a lower parallel roller, each center line of which is installed so that the center lines are parallel to each other so as to roll the aluminum alloy material. At least one second roller unit provided with an upper cross roller and a lower cross roller installed to intersect with each other is provided, and the first and second roller units are provided in the combined rolling mill alternately installed along the conveying direction of the aluminum alloy material. A material inlet step of introducing an aluminum alloy material, and a complex rolling step in which the aluminum alloy material is rolled while passing through the first and second roller units,

The upper cross rollers and the lower cross rollers are installed to be inclined at a predetermined inclination angle at a normal line in the inflow direction of the aluminum alloy material.

In the aluminum alloy sheet rolling method according to the present invention, the aluminum alloy material is rolled by using rollers intersecting each other, so that not only the grains are refined in the aluminum alloy, but also β-fiber and random texture are formed to form an aluminum alloy sheet having excellent moldability. There is an advantage to manufacture.

1 is a perspective view of a cross rolling mill according to the present invention,
2 is a microstructure photograph of an aluminum alloy sheet rolled by conventional parallel rollers at a reduction ratio of 25%,
3 is a microstructure photograph of an aluminum alloy sheet rolled by conventional parallel rollers at a reduction ratio of 35%,
4 is a microstructure photograph of an aluminum alloy sheet rolled by conventional parallel rollers at a reduction ratio of 60%,
5 is a microstructure photograph of an aluminum alloy sheet rolled by a cross rolling mill according to the present invention at a reduction ratio of 25%,
6 is a microstructure photograph of an aluminum alloy sheet rolled by a cross rolling mill according to the present invention at a reduction ratio of 35%,
7 is a microstructure photograph of an aluminum alloy sheet rolled by a cross rolling mill according to the present invention at a reduction ratio of 60%,
8 is an Orientation Distribustion Function (ODF) of an aluminum alloy sheet rolled by a rolling mill provided with parallel rollers,
9 is an Orientation Distribustion Function (ODF) of a sheet of aluminum alloy rolled by a rolling mill provided with intersecting rollers,
10 is a graph showing the plastic deformation ratio of the aluminum alloy sheet processed by the rolling mill provided with rollers intersecting with the rolling roller provided with parallel rollers according to the reduction ratio of 25%, 35%, 60%,
11 is a perspective view of a cross rolling mill according to another embodiment of the present invention,
12 is a perspective view of a cross rolling mill according to another embodiment of the present invention,
13 is a perspective view of a parallel rolling mill according to the present invention,
14 is a perspective view of a combined rolling mill according to another embodiment of the present invention.

Hereinafter, an aluminum alloy sheet rolling method according to the present invention with reference to the accompanying drawings in more detail as follows.

The aluminum alloy sheet rolling method according to the present invention includes a material introduction step and cross rolling step.

In the material introduction step, the aluminum alloy material in which elements other than aluminum are added to aluminum is introduced into a cross rolling mill provided with a plurality of upper cross rollers and a lower cross roller.

The aluminum alloy material is preferably cast in the form of slab (slab) by adding silicon, copper or manganese to aluminum.

The operator inserts the slab type aluminum alloy material between the upper cross roller and the lower cross roller.

1, the above-mentioned cross mill 20 is shown.

Referring to the drawings, the cross rolling mill 20 includes an upper cross roller 21 and a lower cross roller 22 installed so that the center lines cross each other.

The upper cross roller 21 and the lower cross roller 22 are installed at positions spaced apart from each other with respect to the vertical direction, and are inclined at a predetermined inclination angle 23 based on a normal line in the inflow direction of the aluminum alloy material 11. .

At this time, the inclination angle 23 is preferably an angle of 2.5 ° or more and 10 ° or less.

The upper cross roller 21 and the lower cross roller 22 prevent the thickness difference between the edge and the center portion of the aluminum alloy material 11 due to the crossed upper cross roller 21 and the lower cross roller 22. It is preferable that the radius is formed to decrease from both ends to the center so as to be possible.

In the rolling step, the aluminum alloy material 11 introduced into the rolling mill is rolled while passing between the plurality of upper cross rollers 21 and the lower cross rollers 22. At this time, the rolling reduction rate and rolling temperature of the rolling mill is preferably 60%, room temperature to 400 ℃ or less.

The aluminum alloy material 11 rolled by the upper cross roller 21 and the lower cross roller 22 whose center lines cross each other is compared with the aluminum alloy material 11 which has passed through a rolling mill in which the center lines are parallel to each other. Further deformation occurs in the direction orthogonal to the conveying direction of the raw material 11, and the grains are refined.

2 to 7 discloses a microstructure of an aluminum alloy sheet material processed by a rolling mill provided with rollers intersecting with a rolling mill provided with parallel rollers according to respective rolling reduction rates of the rolling mill.

2 to 4 are microstructure photographs of aluminum alloy sheets rolled at 20%, 35%, and 60% reduction ratios in rolling mills provided with conventional parallel rollers, and FIGS. 5 and 7 are 5 °. On a rolling mill provided with rollers having an inclination angle 23 and intersected with each other, microstructure photographs of aluminum alloy sheets rolled at 20%, 35%, and 60% reduction ratios, respectively.

At this time, the aluminum alloy material is preferably 1wt% silicon, 0.5wt% copper, 0.1wt% manganese, 0.5wt% magnesium, the rest is a 6xxx series aluminum alloy made of aluminum.

Rolling was performed in the same condition except for the inclination angle 23 and the reduction ratio of the roller during each rolling. After the rolling, the annealing temperature and time were all progressed in the same manner, and then the microstructure was observed.

As can be seen from the drawing, in the case of the aluminum alloy sheet roll-molded by rollers having an inclination angle 23 of 5 ° and intersecting with each other, the microstructure of the aluminum alloy sheet in which the grain size of the microstructure was processed by general rolling It was relatively smaller than the grains of.

As the size of the grains of the microstructure is smaller, the elongation of the aluminum alloy sheet is improved, and thus, when rolling is performed by rollers intersecting with each other, the workability of the aluminum alloy sheet may be improved.

In addition, it can be seen that the grain size of the rolled aluminum alloy plate microstructure decreases as the reduction ratio increases through FIGS. 2 to 7.

8 is an orientation distribution function (ODF) of an aluminum alloy sheet rolled by a rolling mill provided with parallel rollers, and FIG. 9 is a sheet of aluminum alloy rolled by a rolling mill provided with intersecting rollers. Azimuth distribution function.

Referring to the drawings, it can be seen that β-fiber and random texture are formed in the aluminum alloy sheet rolled by the crossed rollers compared to the aluminum alloy sheet rolled by the parallel rollers.

Thus, as the aluminum alloy sheet has β-fiber and random texture, the tensile strength and elongation increase, so that the workability of the aluminum alloy sheet can be improved when rolling by the crossed rollers.

10 and Table 1 show the graphs and tables for the plastic strain ratio of the aluminum alloy sheet processed by the rolling mill provided with rollers intersecting with the rolling mill provided with parallel rollers according to the reduction ratio of 25%, 35%, 60%. Each is disclosed.

25% 35% 60% Comparative example 0.662 0.662 0.671 Example 0.970 0.869 0.974

The comparative example is an aluminum alloy sheet rolled by a rolling mill provided with conventional parallel rollers according to 25%, 35%, 60% reduction rate, the embodiment is 25%, 35%, 60% reduction ratio, 5 It is an aluminum alloy sheet material roll-molded by rollers which cross each other with the inclination angle 23 of degrees.

The plastic strain ratio (R) is obtained by a tensile test as a measure of the anisotropy of a metal sheet and is determined by the ratio of the plastic strain in the width direction to the plastic strain in the thickness direction of the tensile test piece.

Since most rolled plates have planar anisotropy in which plasticity changes even in a direction parallel to the plane, R values are measured and averaged in various directions, and are generally 0 °, 45 °, and 90 ° with the rolling direction It is common to use R values measured by tensioning, that is, average values of R 0 , R 45 , and R 90 , and R, and are obtained through the following relational formula.

R = (R 0 + 2R 45 + R 90 ) / 4

Therefore, the large plastic strain ratio means that the resistance to thickness reduction during tension is large and the deep draw moldability is improved.

9 and Table 1, the plastic strain ratio of the aluminum alloy sheet rolled by a rolling mill provided with crossed rollers is larger than the plastic strain ratio of the aluminum alloy sheet rolled by a rolling mill provided with conventional parallel rollers. You can check it.

Therefore, it can be seen that when the aluminum alloy material is roll-molded with crossed rollers, the formability of the aluminum alloy plate is improved.

On the other hand, the cross-roller 20 has a plurality of roller units provided with the upper cross roller 21 and the lower cross roller 22 as mentioned above, as shown in Figure 11 a plurality of pull in the aluminum alloy material (11) It may be arranged sequentially along the direction.

At this time, the separation distance between the outer circumferential surfaces of the upper cross roller 21 and the lower cross roller 22 which are opposed to each other is installed so as to become smaller toward the rear toward the entry direction of the aluminum alloy material 11, the upper cross roller installed in the rear 21 and the lower cross roller 22 is preferably installed so that the separation distance corresponds to the thickness of the aluminum alloy plate to be produced.

In addition, the cross rolling mill 20, as shown in Figure 12, the upper cross roller 21 and the lower cross roller 22 of the roller units adjacent to each other in the opposite direction to the normal of the inlet direction of the aluminum alloy material. It may be installed inclined.

On the other hand, the aluminum alloy sheet rolling method according to the present invention is the aluminum alloy after the cross-rolling step between the upper parallel roller and the lower parallel roller of the parallel rolling mill provided with a plurality of upper parallel rollers and lower parallel rollers each center line is installed side by side It further includes a parallel rolling step of introducing and rolling the sheet material.

13 shows the above-mentioned parallel rolling mill 30 in detail.

Elements having the same functions as those in the previous drawings are denoted by the same reference numerals.

Referring to the drawings, in the parallel rolling mill 30, a plurality of upper parallel rollers 31 and lower parallel rollers 32 are arranged along the inlet direction of the aluminum alloy material 11.

At this time, the separation distance between the outer circumferential surfaces of the upper parallel roller 31 and the lower parallel roller 32 are installed to be smaller toward the rear with respect to the pulling direction of the aluminum alloy material 11, the upper parallel roller installed at the rear 31 and the lower parallel roller 32 is preferably installed so that the separation distance corresponds to the thickness of the aluminum alloy plate to be manufactured.

The aluminum alloy material 11 rolled by the cross rolling machine 20 is again rolled by the parallel rolling mill 30 installed at the rear.

On the other hand, the aluminum alloy sheet rolling method according to another embodiment of the present invention includes a material introduction step and the composite rolling step.

In the material introduction step, an element other than aluminum is added to aluminum to introduce the aluminum alloy material 11 into the composite rolling mill provided with at least one first and second roller units.

The aluminum alloy material 11 is preferably cast in slab form by adding magnesium, silicon, copper, manganese or zirconium to aluminum.

The worker introduces a slab-shaped aluminum alloy material 11 between the upper cross roller and the lower cross roller.

In Fig. 14, the above-mentioned combined rolling mill 40 is shown.

Referring to the drawings, the combined rolling mill 40 has at least one first roller unit 41 provided with an upper parallel roller 43 and an upper parallel roller 44 installed so that each center line is parallel with each other so that each center line crosses each other. At least one second roller unit 42 provided with the installed upper cross roller 45 and the lower cross roller 46 is provided.

The upper cross roller 45 and the lower cross roller 46 are installed at positions spaced apart from each other with respect to the vertical direction, and are installed to be inclined at a predetermined inclination angle based on the normal line in the inflow direction of the aluminum alloy material 11.

The said inclination angle is an angle of 2.5 degrees or more and 10 degrees or less, More preferably, it is 5 degrees.

The upper cross roller 45 and the lower cross roller 46 prevent the thickness difference between the edge and the center portion of the aluminum alloy material 11 due to the intersecting upper cross roller 45 and the lower cross roller 46. It is preferable that the radius is formed to decrease from both ends to the center so as to be possible.

At this time, the first and second roller units 41 and 42 are alternately installed along the inflow direction of the aluminum alloy material 11 so as to parallel-roll and cross-roll the aluminum alloy material 11 introduced into the rolling mill. It is preferable to be.

The separation distance between the mutually opposite outer peripheral surfaces of the upper parallel roller 43 and the upper parallel roller 44 and the mutually opposite outer peripheral surfaces of the upper crossing roller 45 and the lower crossing roller 46 are aluminum alloy materials 11 It is installed to be smaller toward the rear toward the pulling direction of the), the rear cross-mounted upper cross-roller 45 and the lower cross-roller 46 or the upper parallel roller 43 and the upper parallel roller 44 is the separation distance It is preferable to be installed so as to correspond to the thickness of the aluminum alloy sheet to be manufactured.

The composite rolling step 500 is a step in which the aluminum alloy material 11 introduced into the rolling mill is rolled through the first and second roller units 41 and 42. At this time, the rolling reduction rate and rolling temperature of the rolling mill is preferably 60%, room temperature to 400 ℃ or less.

In the aluminum alloy sheet rolling method configured as described above, the aluminum alloy material 11 is rolled by alternately passing rollers that cross each other and rollers that cross each other, thereby making it possible to refine the grain size of the aluminum alloy plate.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art.

Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

11: alloy material
20: cross rolling mill
21: upper cross roller
22: lower cross roller
23: tilt angle
30: parallel rolling mill
31: Upper parallel roller
32: Lower parallel roller
40: combined rolling mill
41: first roller unit
42: second roller unit

Claims (3)

A material introduction step of introducing the aluminum alloy material into a cross rolling mill having a plurality of roller units provided with an upper cross roller and a lower cross roller installed to cross each center line so as to roll the aluminum alloy material;
And a cross rolling step in which the aluminum alloy material is rolled while passing through the upper cross roller and the lower cross roller.
The upper cross roller and the lower cross roller are installed to be inclined with respect to the normal line in the inflow direction of the aluminum alloy material,
The roller units are arranged sequentially along the inlet direction of the aluminum alloy material, the upper cross rollers and the lower cross rollers of the adjacent roller units are installed to be inclined in opposite directions with respect to the normal of the inlet direction of the aluminum alloy material. Aluminum alloy sheet rolling method characterized in that.
The method of claim 1,
A plurality of upper parallel rollers and lower parallel rollers are provided, wherein the upper parallel rollers and the lower parallel rollers have finished the cross-rolling step between the upper parallel rollers and the lower parallel rollers of the parallel rolling mills, each center line of which is parallel to each other. Parallel rolling step of introducing and rolling the aluminum alloy material; aluminum alloy sheet rolling method further comprising. delete
KR20100033541A 2010-04-12 2010-04-12 Rolling method for aluminium alloy sheet KR101187247B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101581815B1 (en) 2015-06-18 2016-01-04 성훈엔지니어링(주) Aluminum manufacturing method by screw roller

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102597203B1 (en) 2022-08-25 2023-11-02 (주)알루텍 coiling equipment of aluminium plates
KR102605792B1 (en) 2022-08-25 2023-11-29 (주)알루텍 manufacturing method of aluminium 5052 plates

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1029010A (en) 1996-07-18 1998-02-03 Kawasaki Steel Corp Method for controlling plate thickness in width direction of plate material
JP2000061519A (en) 1998-08-21 2000-02-29 Kawasaki Steel Corp Method for rolling metal plate
JP2004237351A (en) * 2003-02-10 2004-08-26 Mitsubishi Heavy Ind Ltd Rolling method for band material and rolling apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1029010A (en) 1996-07-18 1998-02-03 Kawasaki Steel Corp Method for controlling plate thickness in width direction of plate material
JP2000061519A (en) 1998-08-21 2000-02-29 Kawasaki Steel Corp Method for rolling metal plate
JP2004237351A (en) * 2003-02-10 2004-08-26 Mitsubishi Heavy Ind Ltd Rolling method for band material and rolling apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101581815B1 (en) 2015-06-18 2016-01-04 성훈엔지니어링(주) Aluminum manufacturing method by screw roller

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