CN1415438A - Mfg. method of magnesium alloyed plate for hot rolling and hot rolling method of magnesium alloyed plate - Google Patents
Mfg. method of magnesium alloyed plate for hot rolling and hot rolling method of magnesium alloyed plate Download PDFInfo
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- CN1415438A CN1415438A CN02142584A CN02142584A CN1415438A CN 1415438 A CN1415438 A CN 1415438A CN 02142584 A CN02142584 A CN 02142584A CN 02142584 A CN02142584 A CN 02142584A CN 1415438 A CN1415438 A CN 1415438A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/002—Castings of light metals
- B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
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Abstract
A method of hot-rolling magnesium alloy comprises discharging a magnesium alloy molten fluid at a temperature range which is 50 to 150 DEG C higher than the melting point of the magnesium alloy; casting the magnesium alloy molten fluid at a temperature range which is 30 to 130 DEG C higher than the melting point of the magnesium alloy to obtain a plate-like ingot with a plate thickness of 50 to 300 cm; applying a lateral rolling on the plate-like ingot for 1 to 15% extension in the thickness direction; and applying a hot-rolling in the thickness direction of the plate.
Description
Hu Ye...
The present invention relates to a substrate containing Mg metal as Al, Zn and other additional elements magnesium alloy hot rolling
Method for producing magnesium alloy hot rolling method.
...
The present invention relates to a substrate containing Mg metal as Al, Zn and other additional elements magnesium alloy hot rolling
Method for producing magnesium alloy hot rolling method.
...
Since magnesium alloys in practical use the lightest weight and has excellent stiffness and weight ratio of the intensity ratio
, It is often used as an electronic instrument housing. Conventionally, as a magnesium alloy for casting box
The method of the plate body, such as the use of the magnesium alloy hot extrusion molding, and then the molded sheet for hot rolling
Methods. However, in this method, since the hot extrusion molding extrusion pressure is limited, so the obtained
The unit weight of the plate is restricted. I.e., the length can not be made thin, and that the width of the sheet is also affected by
To greatly constrained, not supply large width of the products.
Since magnesium alloys in practical use the lightest weight and has excellent stiffness and weight ratio of the intensity ratio
, It is often used as an electronic instrument housing. Conventionally, as a magnesium alloy for casting box
The method of the plate body, such as the use of the magnesium alloy hot extrusion molding, and then the molded sheet for hot rolling
Methods. However, in this method, since the hot extrusion molding extrusion pressure is limited, so the obtained
The unit weight of the plate is restricted. I.e., the length can not be made thin, and that the width of the sheet is also affected by
To greatly constrained, not supply large width of the products....
As described above, such as magnesium alloys, low melting point alloy, so far no effective
Manufacturing method can be directly used for manufacture of good quality within the hot rolling large boards.
SUMMARY OF THE INVENTION
In view of the above situation, the present invention is to provide a hot rolling method for producing a magnesium alloy sheet and
Magnesium alloy hot rolling method, this method does not by extrusion molding, there is no need to go through forging can produce
Hot-rolled plate can, therefore, not necessary to use hot forging equipment, the hot rolling machine can be made within the capacity, in
Costs within an allowable range, to expand the length and width of the sheet.
To achieve this object, the present inventors have conducted repeated studies, found that by a specific casting conditions may
Avoid bad casting, thus found to get good productivity, good quality large internal ingot method
. Also found that by using the cast block, then do after forging step, can be directly rolled,
Through horizontal rolling, even in the rolling no cracks can be obtained a good hot-rolled coil. According to
These findings, the present invention has the following structure.
(1) hot rolling method for manufacturing a magnesium alloy sheet, the method is to obtain a magnesium alloy cast thickness of 50 to
300mm ingot flat type, the method is characterized in that the melting point than that of the magnesium alloy 50 ℃ ~ 150
℃ temperature range of baked to make the baked molten magnesium alloy, magnesium alloy than the melting point of 30 ℃ ~ 130
℃ temperature range of casting magnesium alloy casting of the melt.
(1) hot rolling method for manufacturing a magnesium alloy sheet, the method is to obtain a magnesium alloy cast thickness of 50 to
300mm ingot flat type, the method is characterized in that the melting point than that of the magnesium alloy 50 ℃ ~ 150
℃ temperature range of baked to make the baked molten magnesium alloy, magnesium alloy than the melting point of 30 ℃ ~ 130
℃ temperature range of casting magnesium alloy casting of the melt....
(1) hot rolling method for manufacturing a magnesium alloy sheet, the method is to obtain a magnesium alloy cast thickness of 50 to
300mm ingot flat type, the method is characterized in that the melting point than that of the magnesium alloy 50 ℃ ~ 150
℃ temperature range of baked to make the baked molten magnesium alloy, magnesium alloy than the melting point of 30 ℃ ~ 130
℃ temperature range of casting magnesium alloy casting of the melt....-4t
2+2.98×10
-4t+23.6 (1)
t: thickness of the flat ingot (mm).
(3) further defines (1) or (2) A hot-described method for producing a magnesium alloy sheet, mold temperature of 50
℃ ~ 250 ℃.
(4) further defines ((3) A hot-described method for producing a magnesium alloy sheet, the mold temperature was 180 ℃
~ 220 ℃.
(5) further defines (1) to (4) according to any one of the hot rolling method for producing a magnesium alloy sheet, pouring Tao
Speed is 200 ~ 3000cm3/sec。
(5) further defines (1) to (4) according to any one of the hot rolling method for producing a magnesium alloy sheet, pouring Tao
Speed is 200 ~ 3000cm...
(5) further defines (1) to (4) according to any one of the hot rolling method for producing a magnesium alloy sheet, pouring Tao
Speed is 200 ~ 3000cm...
(8) further defining (7) hot rolling method described, the hot rolling step at 180 ℃ ~ 440 ℃ temperature range
Enclosed within.
(9) further defines (6) to (8) described in any one of hot rolling method, the hot rolling process by a plurality of
Rolling said hot-rolled thin plate of magnesium alloy to achieve the desired thickness of the channel of each rolling reduction ratio of 25%
50% range, and, when the total reduction ratio exceeds 60%, reheating.
(10) further defining (6) to (8) described in any one of hot rolling method, the hot rolling step is performed by a plurality of
Rolling said hot-rolled thin plate of magnesium alloy to achieve the desired thickness to 300 ℃ ~ 440 ℃ preheating temperature
Degree on the magnesium alloy sheet for hot preheated after each roll pass the thinning rate was controlled at 25% to 50%
Within the range of hot rolling, and, when the total reduction ratio exceeds 60%, at 230 ℃ ~ 440 ℃ range
Reheating.
(11) further defining (6) to (8) described in any one of hot rolling method, the hot rolling step is performed by a plurality of
Rolling said hot-rolled thin plate of magnesium alloy to achieve the desired thickness to 300 ℃ ~ 440 ℃ preheating temperature
Degree on the magnesium alloy sheet for hot preheated after each roll pass the thinning rate was controlled at 25% to 50%
Within the hot, and when the temperature dropped prior to rolling below 300 ℃ at 230 ℃ ~ 440
℃ range reheating.
(12) Magnesium alloy hot rolling method, the method is characterized in that the magnesium alloy casting with a thickness of 50
~ 300mm flat type ingot step, and not directly through forging the ingot to a hot rolling step of
(13) further defining (12) for hot described method for producing a magnesium alloy sheet, in the magnesium alloy casting
Resulting in a thickness of 50 ~ 300mm flat type cast block step, the melting point than that of the magnesium alloy 50 ℃ ~ 150
℃ temperature range of baked to make the baked molten magnesium alloy, magnesium alloy than the melting point of 30 ℃ ~ 130
℃ temperature range of casting magnesium alloy casting of the melt.
(14) further defining (12) or (13) described in hot rolling method for producing a magnesium alloy sheet, when the magnesium
Kim cast to a thickness of 50 ~ 300mm flat type cast block step, the thickness of the plate-type ingot,
The mold thickness is set to satisfy the following formula (1), mold thickness,
(14) further defining (12) or (13) described in hot rolling method for producing a magnesium alloy sheet, when the magnesium
Kim cast to a thickness of 50 ~ 300mm flat type cast block step, the thickness of the plate-type ingot,
The mold thickness is set to satisfy the following formula (1), mold thickness,...-4t
2+2.98×10
-4t+23.6 (1)
(14) further defining (12) or (13) described in hot rolling method for producing a magnesium alloy sheet, when the magnesium
Kim cast to a thickness of 50 ~ 300mm flat type cast block step, the thickness of the plate-type ingot,
The mold thickness is set to satisfy the following formula (1), mold thickness,...
(15) further defining (12) to (14) according to any one of the hot rolling method for producing a magnesium alloy sheet, cast
Temperature of 50 ℃ ~ 250 ℃.
...
(15) further defining (12) to (14) according to any one of the hot rolling method for producing a magnesium alloy sheet, cast
Temperature of 50 ℃ ~ 250 ℃.
...
(17) further defining (12) to (16) described in any one of hot rolling method for producing a magnesium alloy sheet,
Casting speed is 200 ~ 3000cm3/sec。
(18) further defining (12) to (17) described in any one of the magnesium alloy hot rolling method, flat cast
Block without a step of hot forging and hot rolling with the magnesium alloy sheet rolled along the width direction for 1 ~
15% of the lateral rolling step, and along the thickness direction after the step of hot rolling.
(19) further defining (12) to (18) described in any one of the magnesium alloy hot rolling method, the hot rolling step
- A recrystallization temperature of the eutectic temperature within the range.
(20) further defining (12) to (19) described in any one of the magnesium alloy hot rolling method, the hot rolling step
At 180 ℃ ~ 440 ℃ temperature range.
(21) further defining (12) to (20) described in any one of the magnesium alloy hot rolling method of hot rolling work
Channel sequence by a plurality of rolling hot-rolled thin plate of magnesium alloy to achieve the desired thickness, each rolling channel becomes
Thin rate of 25% to 50%, when the total reduction ratio exceeds 60%, reheating.
(22) further defining (12) to (21) described in any one of the magnesium alloy hot rolling method of hot rolling work
Channel sequence by a plurality of rolling hot-rolled thin plate of magnesium alloy to achieve the desired thickness, at 300 ℃ ~ 440
℃ preheat temperature of the magnesium alloy hot-rolled plate preheated after the reduction ratio per one pass control
25% to 50% range for hot rolling, when the total reduction ratio exceeds 60%, at 230 ℃ ~ 440 ℃ of
Reheating temperature range.
(22) further defining (12) to (21) described in any one of the magnesium alloy hot rolling method of hot rolling work
Channel sequence by a plurality of rolling hot-rolled thin plate of magnesium alloy to achieve the desired thickness, at 300 ℃ ~ 440
℃ preheat temperature of the magnesium alloy hot-rolled plate preheated after the reduction ratio per one pass control
25% to 50% range for hot rolling, when the total reduction ratio exceeds 60%, at 230 ℃ ~ 440 ℃ of
Reheating temperature range....
Although in the present invention, the melting point of the object due to the magnesium alloy and alloy composition vary, but generally
About 650 ℃. Because of this low melting point alloy solidification temperature and the mold temperature, the temperature difference is small, because
Here, if the casting conditions are not ideal, it will cause the casting solidification solidification segregation or rupture, resulting in gas
Body composition mold release material release or firing caused by poor casting surface. In the present invention, the casting
Forming conditions, should control the tapping temperature, the mold thickness, in order to avoid undesirable desired casting.
The present invention can be obtained by casting magnesium alloy sheet thickness of 50 ~ 300mm plate-type ingot. Magnesium alloy
Containing Al, Zr, Zn and other additional elements stretch magnesium alloy (ASTM specification AZ, ZK line, etc.). If the
Thickness below the lower limit, it is difficult to control the thickness of the associated mold solidification time, so it is difficult to melt
Float and remove the impurity inclusions. On the other hand, the thickness is higher than the upper limit, rolled higher costs. So
So ingot thickness 50 ~ 300mm is ideal. Casting mold according to the shape of the block width can be arbitrarily set
. In obtaining such cast block, before casting the tapping temperature to melting point than that of the magnesium alloy 50 ℃ ~ 150
℃. If the oven temperature is below the lower limit, the casting temperature of the melt at the beginning near the freezing point close to the casting
Made before the end began to solidify. If the oven temperature is higher than the upper limit temperature, not only to the casting temperature of the cooling
A long time, but will increase the added ingredients such as evaporation and fire hazard. Because of these reasons,
Will be released until the temperature set in the above temperature range. Although the casting temperature is set at a high melting point than that of the magnesium alloy
30 ℃, but not higher than the melting point of the alloy 130 ℃. Below the lower limit, it will cause bad casting. Other
On the one hand, higher than the upper limit, the lack of a suitable solidification rate. Therefore, the casting temperature should be set at the
Above range.
...
The present invention can be obtained by casting magnesium alloy sheet thickness of 50 ~ 300mm plate-type ingot. Magnesium alloy
Containing Al, Zr, Zn and other additional elements stretch magnesium alloy (ASTM specification AZ, ZK line, etc.). If the
Thickness below the lower limit, it is difficult to control the thickness of the associated mold solidification time, so it is difficult to melt
Float and remove the impurity inclusions. On the other hand, the thickness is higher than the upper limit, rolled higher costs. So
So ingot thickness 50 ~ 300mm is ideal. Casting mold according to the shape of the block width can be arbitrarily set
. In obtaining such cast block, before casting the tapping temperature to melting point than that of the magnesium alloy 50 ℃ ~ 150
℃. If the oven temperature is below the lower limit, the casting temperature of the melt at the beginning near the freezing point close to the casting
Made before the end began to solidify. If the oven temperature is higher than the upper limit temperature, not only to the casting temperature of the cooling
A long time, but will increase the added ingredients such as evaporation and fire hazard. Because of these reasons,
Will be released until the temperature set in the above temperature range. Although the casting temperature is set at a high melting point than that of the magnesium alloy
30 ℃, but not higher than the melting point of the alloy 130 ℃. Below the lower limit, it will cause bad casting. Other
On the one hand, higher than the upper limit, the lack of a suitable solidification rate. Therefore, the casting temperature should be set at the
Above range.
...
Mold thickness (mm) ≥ 1.85 × 10-4t
2+2.98×10
-4t+23.6 (1)
t: flat ingot thickness (mm)
According to the thickness of flat ingot by the formula (1) to set the lower limit specified mold thickness following reasons.
The present inventors have carefully researched and found that coagulation time preferably 2 to 30 minutes, clotting time below the lower
Limit, floating slag melt can not be fully removed, more than the upper limit, the plates will produce coarse particles
Tablets. The solidification time can be controlled by adjusting the thickness of the mold. Through the experiment, the present inventors have also found that
, Can obtain good mold thickness coagulation time between the thickness of the casting block in Figure 1 and Equation (1) below
Relationship. If the mold thickness is less than the formula (1) the lower limit, it will be caused due to insufficient cooling rate cause
The coarse crystal grains, the temperature rise resulting from the mold release material burnt and cause poor casting surface. If
Mold thickness than the lower limit, even if the value is much higher than that of the thickness, it will not affect the present invention described above for the
With the results.
...
According to the thickness of flat ingot by the formula (1) to set the lower limit specified mold thickness following reasons.
The present inventors have carefully researched and found that coagulation time preferably 2 to 30 minutes, clotting time below the lower
Limit, floating slag melt can not be fully removed, more than the upper limit, the plates will produce coarse particles
Tablets. The solidification time can be controlled by adjusting the thickness of the mold. Through the experiment, the present inventors have also found that
, Can obtain good mold thickness coagulation time between the thickness of the casting block in Figure 1 and Equation (1) below
Relationship. If the mold thickness is less than the formula (1) the lower limit, it will be caused due to insufficient cooling rate cause
The coarse crystal grains, the temperature rise resulting from the mold release material burnt and cause poor casting surface. If
Mold thickness than the lower limit, even if the value is much higher than that of the thickness, it will not affect the present invention described above for the
With the results.
...
Casting speed and casting weight related, but if the casting speed is too slow will cause segregation during solidification, fast
Not the whole surface will appear undesirable situation should therefore be 200 ~ 3000cm3/ sec range. In actual operation
As in, as the goal with a homogeneous plate, the cast time within 2 minutes.
Then, in the present invention, hot forging and hot rolling without. The present inventors confirmed that the plate was heated to
180 ℃ case after hot rolling, the web breakage occurs, in addition, the heat was heated to 450 ℃
Rolling conditions, will produce undesirable tissue caused by heating. Therefore, considering the heating of the rupture, should
The recrystallization temperature of the magnesium alloy eutectic point or more to the range below the hot-rolled without forging,
Preferably 180 ℃ ~ 440 ℃ temperature range for three hours or more homogenization treatment. If less than this
Temperature range, the productivity will be reduced, if higher than this temperature range, then there may be segregation. In
If homogenizing treatment, in order to prevent rupture of the hot rolling, hot rolling along the thickness direction in the previous step
Now, the width direction of the plate 1 to 15% of the lateral rolling. If the rolling rate exceeds the upper limit, you can not
By broadening expected to reach the final rolling rolling increments. If below the lower limit, you can not play to prevent rupture
Results.
...
The so-called hot-rolled, specifically, a plurality of rolling road through the use of magnesium alloy hot-rolled thin plate to achieve the Greek
Desired thickness to 300 ℃ ~ 440 ℃ preheating temperature of the hot-rolled with a magnesium alloy sheet preheating, each roll
Thinning rate control channel in a 25% to 50% range, when the total reduction ratio exceeds 60%, at 230 ℃ ~ 440
℃ range is reheated before or when the rolling temperature is lower than 300 ℃ below, at 230 ℃ ~
Within the range of 440 ℃ reheating. After reheating, use the remaining rolling road (per one pass thinning rate
25% to 50%), to obtain the desired thickness of hot-rolled coil. If thinning rate per one pass below the lower limit
25%, it will not be continuous rolling by crimping, if above the upper limit 50%, the material has a fracture can be
Energy. If the temperature is lower than before rolling 300 ℃, then there is the risk of material fracture. As a condition of re-heating
, The heat treatment temperature is 230 ℃ ~ 440 ℃ preferably a eutectic temperature below the upper limit, and must be recrystallized
Temperature, preferably in the range of 400 ℃ ~ 430 ℃. If the preheating temperature, and then a heat treatment temperature exceeds the
Eutectic temperature heat treatment, will result in undesirable tissue, thereby seriously damaging the processing quality.
...
In practice, in order to carry out the hot rolling step and the intermediate reheating in a different line feed
OK, according to the following program implementation. Since magnesium alloy hot-rolled plate temperature below 300 ℃ or total rolling
Rate is increased, the rolling material will increase the risk of rupture, so that the magnesium alloy sheet should be sent from a rolling mill
Furnace. Reheating the purpose obtained by recrystallization first processed to form a plastic deformation, so add
Heating temperature must be over a recrystallization temperature. If the only purpose of recrystallization, the temperature as high as possible
The most effective short degrees. For example, when the heating temperature may be 440 ℃, and then another heating
Material structure is intended to regulate, in a short period of time then is heated to rolling temperature of the material must (
For example, 300 ℃ above), the material is sent to the rolling line rolling step implementation.
...
In practice, in order to carry out the hot rolling step and the intermediate reheating in a different line feed
OK, according to the following program implementation. Since magnesium alloy hot-rolled plate temperature below 300 ℃ or total rolling
Rate is increased, the rolling material will increase the risk of rupture, so that the magnesium alloy sheet should be sent from a rolling mill
Furnace. Reheating the purpose obtained by recrystallization first processed to form a plastic deformation, so add
Heating temperature must be over a recrystallization temperature. If the only purpose of recrystallization, the temperature as high as possible
The most effective short degrees. For example, when the heating temperature may be 440 ℃, and then another heating
Material structure is intended to regulate, in a short period of time then is heated to rolling temperature of the material must (
For example, 300 ℃ above), the material is sent to the rolling line rolling step implementation.
...
BRIEF DESCRIPTION
Figure 1 shows a flat plate to obtain excellent thickness between the thickness and the mold.
Figure 2 shows the shape of the mold, (2A) is a front view, (2B) is a plan view.
Figure 3 shows a mold plate to obtain excellent temperature between the casting temperature.
Specific embodiments
[Example 1]
Using equivalent AZ21 magnesium alloy sheet (thickness 86mm, width 400mm, length 1500mm) Example
By the formula (1) obtained by the thickness of the mold 1, the use of a soft steel plate thickness of 25mm, according to Figure 2 is set
Installed, the guide surface 400mm × 1500mm can be removed. The inner surface of the mold, the painting of the silicic acid
Mg as the main release agent, dried, heated with a burner to about 200 ℃.
By the formula (1) obtained by the thickness of the mold 1, the use of a soft steel plate thickness of 25mm, according to Figure 2 is set
Installed, the guide surface 400mm × 1500mm can be removed. The inner surface of the mold, the painting of the silicic acid
Mg as the main release agent, dried, heated with a burner to about 200 ℃....3By the formula (1) obtained by the thickness of the mold 1, the use of a soft steel plate thickness of 25mm, according to Figure 2 is set
Installed, the guide surface 400mm × 1500mm can be removed. The inner surface of the mold, the painting of the silicic acid
Mg as the main release agent, dried, heated with a burner to about 200 ℃....
After complete solidification of the ingot surface treatment (66mm thickness, 400mm in width, 1200mm length), with
For hot rolling.
After complete solidification of the ingot surface treatment (66mm thickness, 400mm in width, 1200mm length), with
For hot rolling....
After complete solidification of the ingot surface treatment (66mm thickness, 400mm in width, 1200mm length), with
For hot rolling....
[Comparative Example 1] selected ingot thickness failure patients
The 20mm thick ingot as in Example 1 except that the hot rolling, the rolling direction at right angles generated
Micro-joints, and anchored rupture. The reason is because the thickness of the ingot is not enough, the mixed melt
Caused by insufficient quality float inherent defects.
[Comparative Example 2] A mold thickness selected failure patients
To a thickness of the ingot 80mm, thickness of the mold of Example 1 is 10mm to do the experiment. There is a cooling speed
Degree and mold cooling capacity shortage, resulting in a coarse particles, causing adverse casting surface. Need
The flat surface of the ingot grinding number of 10mm, in addition, hot cracking appeared.
To a thickness of the ingot 80mm, thickness of the mold of Example 1 is 10mm to do the experiment. There is a cooling speed
Degree and mold cooling capacity shortage, resulting in a coarse particles, causing adverse casting surface. Need
The flat surface of the ingot grinding number of 10mm, in addition, hot cracking appeared....
To a thickness of the ingot 80mm, thickness of the mold of Example 1 is 10mm to do the experiment. There is a cooling speed
Degree and mold cooling capacity shortage, resulting in a coarse particles, causing adverse casting surface. Need
The flat surface of the ingot grinding number of 10mm, in addition, hot cracking appeared....
Example 1 and Comparative Examples 1 to 3, production conditions and the results obtained are recorded in Table 1.
Table 1 Conditions for producing magnesium alloy sheet 1 and the results
| Items | Example 1 | Comparative Example 1 | Comparative Example 2 | Comparative Example 3 | |||
| Flat Specification (mm) | Thickness | 86 | 20 | 80 | 86 | ||
| Thickness... | 400 | 400 | 400 | 400 | |||
| Thickness... | 1500 | 1500 | 1500 | 1500 | |||
| Mold thickness (mm) | 25 | 25 | 10 | 25 | |||
| Mold preheating temperature (℃) | 200 | 220 | 200 | 180 | |||
| Baked Temperature (℃) | 720 | 730 | 720 | 740 | |||
| Casting temperature (℃) | 690 | 700 | 690 | 705 | |||
| Casting Speed (cm3/sec) | 900 | 200 | 900 | 900 | |||
| Homogenization heat treatment conditions (℃, hr) | 430、3 | 430、3 | 430、3 | 430、3 | |||
| Roll System Article Item | Width reduction rate (%) | 7.5 | 7.2 | 7.3 | 0 | ||
| Rolling Views | 7 | 2 | 4 | 7 | |||
| Reduction ratio per one pass (%) | 28～35 | 25～30 | 25～40 | 28～40 | |||
| Reheating before rolling rate (%) | 48 | - | - | 48 | |||
| Re-heating conditions (℃, hr) | 430、3 | - | - | 430、3 | |||
| Final thickness (mm) | 4.0 | 9.8 | 16.5 | 4.0 | |||
| Result | Good casting surface | ○ | × | × | ○ | ||
| There is no thick The crystal grains | ○ | ○ | × | ○ | |||
| There is no fracture | ○ | × | × | × | |||
| Remark | Casting surface Good, rolling The system out without Edge Crack Good volume Timber. | Produce casting Poor surface Case, In the rolling two rolling Road of material Rupture. | As solidification Speed substandard Fitness, so In the hot rolling 4 Road generated when Rupture. | Although made good Flat, but No width Rolling, thus producing Raw edge cracks. | |||
[Example 2]
Using the equivalent of AZ21 magnesium alloy sheet (thickness 170mm, width 600mm, length 1500mm) the implementation of the
Case.
By the equation (1) calculates the thickness of the mold 1, the use of a soft steel plate thickness of 30mm, according to the shape of Figure 2
The assembly, so that the surface of 600mm × 1500mm can be removed. The inside of the mold, blotted out by
Magnesium silicate as the main mold release agent, after drying, heated with a burner to about 200 ℃.
170mm × 1500mm casting surface with the upper surface of the casting. Magnesium alloy by burning stove
Melting to 660 ℃ for refining, degassing. Baked before heating to 720 ℃, injected into the ladle 2,
To 690 ℃ for casting. Casting speed of 1100cm3/ sec, until completely solidified after casting time of 6 minutes
.
After complete solidification of the ingot surface treatment (66mm thickness, 400mm in width, 1200mm length), with
For hot rolling.
After casting the plate in an inert protective gas is set to 430 ℃ for 4 hours homogenization treatment,
Immediately after the width from 580mm to 534mm rolling (8%), then every one pass of 25 to 50%
Hot rolling, the thickness changes from 150mm 47mm, after reheating (set at 430 ℃, in an inert protective
Gas is heated for 4 hours) and immediately each roll pass 25 to 50% of the hot-rolled, the thickness changes from 47mm
8.0mm.
Tablet was prepared by the above process and rolled coil, in obtaining flat ingot found no internal
Department of existence more than a few mm in diameter, coarse particles. In addition, the organization after rolling, it did not happen because of
Coarse particles cause cracks in the width direction of the edge is no edge cracking phenomenon. So you can
Confirmed that using this method can achieve good rolling effect.
[Comparative Example 4] casting mold preheat temperature and the failure temperature is selected in Example 1
Example 2 using the same mold, with the mold temperature was 140 ℃, the casting temperature is 650 ℃ for
Experiments, the melt in the casting process begins to solidify, there casting surface of the casting such as wrinkles bad situation
. For the ingot to obtain a flat surface grinding surface defects, and then to hot rolling. Hot rolling,
Appeared in the rolling direction of the ingot plate of rectangular defects inherent cracks.
Example 2 using the same mold, with the mold temperature was 140 ℃, the casting temperature is 650 ℃ for
Experiments, the melt in the casting process begins to solidify, there casting surface of the casting such as wrinkles bad situation
. For the ingot to obtain a flat surface grinding surface defects, and then to hot rolling. Hot rolling,
Appeared in the rolling direction of the ingot plate of rectangular defects inherent cracks....
Example 2 using the same mold, with the mold temperature was 140 ℃, the casting temperature is 650 ℃ for
Experiments, the melt in the casting process begins to solidify, there casting surface of the casting such as wrinkles bad situation
. For the ingot to obtain a flat surface grinding surface defects, and then to hot rolling. Hot rolling,
Appeared in the rolling direction of the ingot plate of rectangular defects inherent cracks....
[Comparative Example 6] A casting mold preheat temperature and the failure temperature is selected in Example 3
...
[Comparative Example 6] A casting mold preheat temperature and the failure temperature is selected in Example 3
...
Example 2 and Comparative Examples 4 to 6 of the production conditions and the results recorded in Table 2.
Table 2 the production conditions of magnesium alloy sheet 2 and the results
| Items | Example 2 | Comparative Example 4 | Comparative Example 5 | Comparative Example 6 | |||
| Flat Specification (mm) | Thickness | 170 | 170 | 170 | 170 | ||
| Width | 600 | 600 | 600 | 600 | |||
| Width... | 1500 | 1500 | 1500 | 1500 | |||
| Width... | 30 | 30 | 30 | 30 | |||
| Mold preheating temperature (℃) | 200 | 140 | 275 | 275 | |||
| Baked Temperature (℃) | 720 | 720 | 720 | 780 | |||
| Baked Temperature (℃)... | 690 | 650 | 700 | 750 | |||
| Baked Temperature (℃)...3/sec) | 1100 | 1100 | 1100 | 1100 | |||
| Homogenization heat treatment conditions (℃, hr) | 430、4 | 430、4 | 430、4 | 430、4 | |||
| Roll System Article Item | Width reduction rate (%) | 8.1 | 9.2 | 7.3 | 8.3 | ||
| Rolling Views | 15 | 15 | 15 | 6 | |||
| Reduction ratio per one pass (%) | 25～50 | 25～50 | 25～50 | 25～50 | |||
| Reheating before rolling rate (%) | 58 | 57 | 58 | - | |||
| Reheating strip (℃, hr) | 430、4 | 430、4 | 430、4 | - | |||
| Final thickness (mm) | 3.0 | 3.0 | 3.0 | 5.0 | |||
| Result | Good casting surface | ○ | × | × | × | ||
| No coarse crystal grains | ○ | ○ | ○ | × | |||
| There is no fracture | ○ | × | × | × | |||
| Remark | Casting surface Good, rolling The system out without | Since casting Conditions do not apply Together, so | Since casting Conditions do not apply Together, so | Since casting Conditions do not apply Together, so... | |||
| Since casting Conditions do not apply Together, so... | Generated due to casting Making wrinkles Lack of formation Subsidence caused by Rupture. ... | Generated due to casting Making wrinkles Lack of formation Subsidence caused by Rupture. ... | Coarse crystalline particles Dahua site in the When rolling six rolling road Cause material break Crack. |
Using the present invention, after the hot forging step may not be directly subjected to hot rolling, for example, can be manufactured over 200
Kg of magnesium alloy large membrane.
Claims (23)
1 magnesium alloy rolled sheet manufacturing method of the magnesium alloy is cast to obtain a thickness of 50 to
300mm flat type cast block, characterized in that the magnesium alloy melting point than that of 50 ℃ ~ 150 ℃
The tapping temperature range so that the magnesium alloy melt of baked in melting point than that of the magnesium alloy 30 ℃ ~ 130
℃ temperature range of casting magnesium alloy casting of the melt.
(2) as claimed in claim 1, wherein the hot rolling method for producing a magnesium alloy sheet, further characterized in that for
Thickness of flat ingot, the mold thickness is set to satisfy the following formula (1), mold thickness,
(2) as claimed in claim 1, wherein the hot rolling method for producing a magnesium alloy sheet, further characterized in that for
Thickness of flat ingot, the mold thickness is set to satisfy the following formula (1), mold thickness,...-4t
2+2.98×10
-4t+23.6 (1)
(2) as claimed in claim 1, wherein the hot rolling method for producing a magnesium alloy sheet, further characterized in that for
Thickness of flat ingot, the mold thickness is set to satisfy the following formula (1), mold thickness,...
3 as claimed in claim 1, wherein the hot rolling method for producing a magnesium alloy sheet, further characterized in that the mold
Temperature is 50 ℃ ~ 250 ℃.
4 as claimed in claim 3, wherein the hot rolling method for producing a magnesium alloy sheet, further characterized in that the mold
Temperature of 180 ℃ ~ 220 ℃.
5 as claimed in claim 1, wherein the hot rolling method for producing a magnesium alloy sheet, further characterized in that the pouring Tao
Speed is 200 ~ 3000cm3/sec。
6 magnesium alloy hot rolling method comprising the hot-rolled plate along with the magnesium alloy sheet width
Direction of from 1 to 15% of the lateral rolling step, and after the step of hot rolling in the thickness direction
A step.
6 magnesium alloy hot rolling method comprising the hot-rolled plate along with the magnesium alloy sheet width
Direction of from 1 to 15% of the lateral rolling step, and after the step of hot rolling in the thickness direction
A step....
6 magnesium alloy hot rolling method comprising the hot-rolled plate along with the magnesium alloy sheet width
Direction of from 1 to 15% of the lateral rolling step, and after the step of hot rolling in the thickness direction
A step....
(10) as claimed in claim 6, wherein the hot rolling method, further characterized in that a plurality of rolling by hot rolling step
Said hot-rolled thin plate of magnesium alloy to achieve the desired thickness of the reduction ratio per one pass of 25%
50% range, and, when the total reduction ratio exceeds 60%, reheating.
(10) as claimed in claim 6, wherein the hot rolling method, further characterized in that a plurality of rolling by hot rolling step
Said hot-rolled thin plate of magnesium alloy to achieve the desired thickness of the reduction ratio per one pass of 25%
50% range, and, when the total reduction ratio exceeds 60%, reheating....
As claimed in claim 6, wherein the hot rolling method, further characterized in that the hot rolling step is performed by a plurality of
Rolling said hot-rolled thin plate of magnesium alloy to achieve the desired thickness to 300 ℃ ~ 440 ℃ preheating temperature
Degree on the magnesium alloy sheet for hot preheated after each roll pass the thinning rate was controlled at 25% to 50%
Hot rolling within the range, and when the temperature dropped prior to rolling below 300 ℃ at 230 ℃ ~ 440
℃ range reheating.
12 magnesium alloy hot rolling method comprising the magnesium alloy casting to a thickness of 50 ~
Flat ingot of 300mm step, and not directly through forging the ingot to a hot rolling step.
13 as claimed in claim 12, wherein the hot rolling method for producing a magnesium alloy sheet, further characterized in that
The magnesium alloy casting to a thickness of 50 ~ 300mm flat type cast block step, the melting point than that of the magnesium alloy
High 50 ℃ ~ 150 ℃ temperature range of baked to make the baked molten magnesium alloy, magnesium alloy than the melting
High point 30 ℃ ~ 130 ℃ temperature range of casting magnesium alloy casting of the melt.
14 as claimed in claim 12, wherein the hot rolling method for producing a magnesium alloy sheet, further characterized in that
The magnesium alloy casting to a thickness of 50 ~ 300mm flat type cast block step, the plate-type cast block
Thickness, thickness of the mold is set to satisfy the following formula (1) of the mold thickness,
Mold thickness (mm) ≥ 1.85 × 10-4t
2+2.98×10
-4t+23.6 (1)
t: plate thickness (mm).
15 as claimed in claim 12, wherein the hot rolling method for producing a magnesium alloy sheet, further characterized in that the casting
Temperature of 50 ℃ ~ 250 ℃.
16 as claimed in claim 15, wherein the hot rolling method for producing a magnesium alloy sheet, further characterized in that the casting
Temperature of 180 ℃ ~ 220 ℃.
16 as claimed in claim 15, wherein the hot rolling method for producing a magnesium alloy sheet, further characterized in that the casting
Temperature of 180 ℃ ~ 220 ℃....3/sec。
16 as claimed in claim 15, wherein the hot rolling method for producing a magnesium alloy sheet, further characterized in that the casting
Temperature of 180 ℃ ~ 220 ℃....
19 as claimed in claim 12, wherein the magnesium alloy hot rolling method, further characterized in that the hot rolling step in the
- A recrystallization temperature of the eutectic temperature range.
20 as claimed in claim 12, wherein the magnesium alloy hot rolling method, further characterized in that the hot rolling step in the
180 ℃ ~ 440 ℃ temperature range.
20 as claimed in claim 12, wherein the magnesium alloy hot rolling method, further characterized in that the hot rolling step in the
180 ℃ ~ 440 ℃ temperature range....
20 as claimed in claim 12, wherein the magnesium alloy hot rolling method, further characterized in that the hot rolling step in the
180 ℃ ~ 440 ℃ temperature range....
23 as claimed in claim 12, wherein the magnesium alloy hot rolling method, further characterized in that the hot rolling step
Path through a plurality of rolling of magnesium alloy hot-rolled thin plate so as to achieve the desired thickness, at 300 ℃ ~ 440 ℃
The preheating temperature of magnesium alloy hot-rolled plate preheated after the reduction ratio per one pass control
25% to 50% range for hot rolling, and, when the rolling temperature to 300 ℃ prior below, the
230 ℃ ~ 440 ℃ range reheating.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001322109 | 2001-10-19 | ||
| JP2001322109A JP3657217B2 (en) | 2001-10-19 | 2001-10-19 | Method for producing magnesium alloy slab for hot rolling and method for hot rolling magnesium alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1415438A true CN1415438A (en) | 2003-05-07 |
| CN1261242C CN1261242C (en) | 2006-06-28 |
Family
ID=19139207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021425841A Expired - Lifetime CN1261242C (en) | 2001-10-19 | 2002-08-19 | Mfg. method of magnesium alloyed plate for hot rolling and hot rolling method of magnesium alloyed plate |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP3657217B2 (en) |
| KR (1) | KR100582802B1 (en) |
| CN (1) | CN1261242C (en) |
| HK (1) | HK1055408A1 (en) |
| TW (1) | TW533100B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102416405A (en) * | 2011-09-29 | 2012-04-18 | 西部钛业有限责任公司 | Method for processing magnesium alloy wide-width medium-thick plate |
| CN103272852A (en) * | 2013-04-30 | 2013-09-04 | 中色科技股份有限公司 | Technology for rolling wide magnesium alloy plate and strip |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100671196B1 (en) * | 2005-04-02 | 2007-01-25 | 주식회사 지알로이테크놀로지 | Manufacturing method of particle-distributed wrought magnesium alloys and wrought magnesium alloys thereby |
| JP4296158B2 (en) * | 2005-03-15 | 2009-07-15 | 株式会社日本製鋼所 | Method for producing Mg alloy |
| JP5467294B2 (en) * | 2008-06-05 | 2014-04-09 | 独立行政法人産業技術総合研究所 | Easy-formable magnesium alloy sheet and method for producing the same |
| KR101481909B1 (en) | 2013-08-08 | 2015-01-13 | 주식회사 포스코 | Manufacturing method of magnesium alloy |
| CN103658173B (en) * | 2013-12-13 | 2016-01-06 | 内蒙古科技大学 | A kind of method based on billet production different performance magnesium alloy plate |
| US10370745B2 (en) * | 2014-08-01 | 2019-08-06 | The Boeing Company | Magnesium-zinc-manganese-tin-yttrium alloy and method for making the same |
| CN105463354A (en) * | 2016-01-22 | 2016-04-06 | 重庆大学 | Method for improving strength of magnesium alloy plate through pre-stretching and low-temperature annealing technology |
| CN108787780A (en) * | 2017-04-26 | 2018-11-13 | 中国宝武钢铁集团有限公司 | The production line of even volume production magnesium alloy board volume squeezes in a kind of company |
| CN109465310A (en) * | 2018-12-26 | 2019-03-15 | 西南铝业（集团）有限责任公司 | A kind of high-magnesium aluminum alloy ultra-thick plate and its control technique |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2648731B2 (en) * | 1992-03-23 | 1997-09-03 | 新日本製鐵株式会社 | Hot rolling method of Cu-added high Mg aluminum alloy |
| JPH10216806A (en) * | 1997-02-04 | 1998-08-18 | Nippon Steel Corp | Method for hot-rolling al-mg base alloy |
| JP3398050B2 (en) * | 1998-05-27 | 2003-04-21 | 大平洋金属株式会社 | Method for producing hot rolled sheet of high Ni alloy |
| JP4278256B2 (en) * | 2000-01-06 | 2009-06-10 | 日本金属株式会社 | Warm plastic working method |
-
2001
- 2001-10-19 JP JP2001322109A patent/JP3657217B2/en not_active Expired - Lifetime
-
2002
- 2002-08-09 TW TW091117932A patent/TW533100B/en not_active IP Right Cessation
- 2002-08-17 KR KR1020020048700A patent/KR100582802B1/en active IP Right Grant
- 2002-08-19 CN CNB021425841A patent/CN1261242C/en not_active Expired - Lifetime
-
2003
- 2003-10-23 HK HK03107652A patent/HK1055408A1/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102416405A (en) * | 2011-09-29 | 2012-04-18 | 西部钛业有限责任公司 | Method for processing magnesium alloy wide-width medium-thick plate |
| CN103272852A (en) * | 2013-04-30 | 2013-09-04 | 中色科技股份有限公司 | Technology for rolling wide magnesium alloy plate and strip |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1261242C (en) | 2006-06-28 |
| TW533100B (en) | 2003-05-21 |
| JP2003126943A (en) | 2003-05-08 |
| HK1055408A1 (en) | 2004-01-09 |
| KR20030032830A (en) | 2003-04-26 |
| JP3657217B2 (en) | 2005-06-08 |
| KR100582802B1 (en) | 2006-05-23 |
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