TW533100B - Method of preparing a magnesium alloy slab for hot-rolling and method of hot-rolling magnesium alloy - Google Patents

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

V. Description of the invention 0) Yuan Lingzhi is about the manufacturing method of magnesium metal-based and containing aluminum, rhenium, etc. added rolled square, gold, and ingots, and the thermal alloy of magnesium alloy 3 gold series practical alloys Since it is the lightest and more heavy-weight than the tongue Θ, jin has gradually been adopted as the frame of electronic equipment. In the past, a method for manufacturing a plate-like material for producing a magnesium alloy frame body by M has been extended. Can:] Hot-extrusion molding, and then the molding material is heated to a pressure of 7 times. In this method, when the hot-extrusion molding is performed, because the extrusion pressure is a bit, the board can be obtained. The unit weight of the material is also 2 thin. That is to say, the production of long thin plates is impossible, and even more so. ' On the other hand, there is a large limitation on the width, so it is not possible to supply a large width. Forging i: = You have to make a cast by casting, and this ingot is heated). Hot rolling (refer to JP-A-Sho 35-6602): Organization: = 2 The reason for hot forging after casting, is cast, so ^ = Wang Wang has coarse crystals with a diameter of several millimeters in the structure ^ ^ The process of destroying the cast structure is indispensable before hot rolling. It will increase ^. ,, and, because hot forging equipment is needed, the manufacturing cost uί = 上 呪 明, for low melting alloys such as magnesium alloys, to At present, the == good manufacturing method can produce large thick blocks that can be directly supplied to the sintering process and have good internal quality. ▲ The purpose is to provide a method and a method of manufacturing magnesium alloy thick blocks for hot rolling. & The hot-rolling method of gold does not require extrusion or molding

> Description of the invention (2) After hot-forging, you can use hot-forging equipment as a hot-rolling maker. The hot-rolling machine must be within the range of production cost and the board can be expanded. In order to achieve the foregoing object, the present invention has a length sub-width. As a result, it was found that under specific casting conditions, the following research was conducted: Therefore, the dog can obtain good productivity and poor internal ab production. What's more, by using the aforementioned casting screw, no; warp = just 1 It can directly implement hot rolling; at the same time, 1 forging process and rolling can be obtained without cracking at the end of the rolling: good; the house is structured as follows: · It is formed by rolling and has (1) a hot rolling Manufacture of magnesium alloy thick block Magnesium alloy is obtained to obtain a plate thickness of 50 ~ 300 mm. The block type is cast at a temperature higher than the melting point of the aforementioned magnesium alloy by 5 (rc ~ 15 [: middle, inner: the town alloy melt) Bake it out; cast the molten material even higher than the casting temperature range of 30 0130 C. Magnesium castings are poured (2)-a block of magnesium alloy thick block for hot rolling In the method of the pattern prayer key, the method is set to the thickness of the thick block type ingot that can meet the following (丨,; degree relative Γ template (1; mm ... 23. T: thick block type ingot thickness (mm) 3} Magnesium gold for hot rolling according to (1) or (2) above 533100

5. Description of the invention (3) The manufacturing method of the block, wherein the mold temperature is 50 ° C ~ 25 0 ° C. (4) The method for producing a magnesium alloy thick block for hot rolling according to the above (3), wherein the mold temperature is 180. 〇 22 0 ° C. & (5) The method for producing a magnesium alloy thick block for hot rolling according to (1) to (4) above, wherein the casting speed is 200 to 3000 cm3 / sec. (6) A method for hot-rolled rolling of ballast alloys, including the following steps: · Rolling the widthwise% rolling of the ball-alloy thick block for hot-rolling; and after the foregoing steps, hot-rolling in the thickness direction of the plate ... 1) The thermal rolling method of the magnesium alloy described in the above Ib), wherein the thermal rolling process is performed within a strict recrystallization temperature range of the recrystallization of the magnesium alloy for thermal rolling. 2. The daily hot-rolling method of the magnesium alloy described in (8) above (?), In the pot, the hot-rolling process is carried out at a temperature range of 18 (TC ~ 440 t). 6) ~ (8) Magnesium alloy described in the following process: U in the 'hot room f rolling process will be used to roll the ball alloy for hot room rolling equalizing channels to reduce the thickness to achieve the desired The thickness is reduced by 60%; the rate is controlled at 25% to 5%, and the total thickness reduction rate is reheated. The intermediate pressure is described in any one of (6) to (8) above. The method of magnesium alloy of magnesium alloy, in which the hot rolling process will release the gate of the gate, and the majority of the ghost bismuth refers to 你 ii, the calender rolling of the magnesium alloy with a thickness of 30 μ When pressing B to reduce the thickness to achieve the desired thickness, the ballast alloy block used for hot rolling is preheated within the preheating temperature range of C, preheating, and the thickness reduction rate of the secondary rolling is implemented after preheating. Controlled at 25% j 533100 V. Description of the invention (4)% of thermal rolling, and

~ 440. (: The reheating is performed within the temperature range, at 230 ° C (11) The rolling method between (6) to (8) φ weights described above, Fuzhong, Qimenyu from the magnesium alloy heat described in the above item After the block has been rolled, the hot-rolled magnesium alloy is thickened by 7 double k double rolling in order to reduce the thickness to reach 30 (KC ~ 44.). 〇〇r ^ In addition, the temperature immediately before rolling has not been lowered to the temperature of 230. 〇 ~ 440 ° C temperature range. · () Ball rolling alloy hot rolling method, including the following steps:: _Gold is made each time to obtain a thick block type spare key with a plate thickness of 50 ~ 300 mm and the hot-rolled rolling of the aforementioned cast key without hot-forging 0 ^ (1 3) (1 2) The method of manufacturing the magnesium alloy thick block for hot rolling according to the & method, wherein the magnesium alloy is cast to obtain a plate thickness of 50 ~ 300 mm thick block type turn key, The melting temperature of the magnesium alloy is 50 C ^ 1 5 Π ° p ^-^ higher than the melting point of the foregoing magnesium alloy. The point is even higher than 30. 0 130 ° C casting temperature range to melt the town alloy, physical strength Π to wash cast. (14) Magnesium alloy thick block for hot rolling according to the above (12) or (13) A manufacturing method in which a magnesium alloy is cast to obtain a plate thickness of ~ 300 mm thick ingot ^ ingot. The thickness of the mold is set relative to: The thickness of the $ f-type ingot can satisfy the following (1) formula .

~ Slab thickness (mm) y.85 X 10-to + 2.98 X 10-H 23 ·

Page 7 533100

t: Thickness of thick block type ingot (mm) (15) The method for producing a magnesium alloy thick block for hot rolling according to any one of (12) to (14), wherein the mold temperature is 50%. . 〇 ~ 2 ° C. (16) The method for producing a magnesium alloy thick block for hot rolling according to the above (15), wherein the mold temperature is 180 to 220 ° C. (Π) The method for producing a ballast alloy block for hot rolling according to any one of (12) to (16) above, wherein the casting speed is 2000 to 3000 cm3 / sec. (18) The hot-rolling method of the magnesium alloy according to any one of (12) to (17), wherein the step of applying hot-rolling to the ingot without hot-forging includes the following steps: The magnesium alloy thick block for hot rolling is subjected to a lateral rolling of 15% with respect to the width direction; and after the foregoing steps, the hot rolling is performed for the plate thickness direction. (19) The hot rolling method of the magnesium alloy according to any one of the above (12) to (18), wherein the hot rolling process is performed within a range from a recrystallization temperature to a eutectic temperature of the magnesium alloy for hot rolling. . (20) The hot-rolling method of the magnesium alloy according to any one of (12) to (19) above, wherein the hot-rolling process is performed in a temperature range of 80 to 44 °. (21) The method for hot rolling of the magnesium alloy according to any one of (12) to (20) above, wherein the hot rolling rolling step rolls the alloy thick block for hot rolling through a plurality of passes to reduce its thickness. To achieve the desired thickness ^

Page 8 533100 V. Description of the invention ⑹ Moreover, when the total thickness reduction rate is controlled to be 25% to 50%, and the thickness reduction rate exceeds 60%, reheating is performed. (22) Any of the hot rolling methods described in (12) to (21) above, wherein the thick block of the town alloy described in the hot rolling item is repeatedly used to reduce the thickness by J to: J extension When the town alloy is within the preheating temperature range of 300 ° C to 440 / C, the block is preheated, and preheating is performed once, and the pressing is performed once.

The rolling thickness of ~~ is controlled, and the thickness reduction rate of the following ^ is controlled at 25U 1440 C. Λ When the thickness reduction rate exceeds 60%, it is 230

^ The reheating is performed inside the dish target. U inter-pressure ("3 party V, j mentioned ~ ~ (21) any of the ballast alloys described in the item-rolling method, rolling method, # 中 'The hot inter-rolling process will = .nf) 0r ,, n〇r, When the thickness is reduced to achieve the desired thickness, the hot rolling is used for pre-heating within the pre-heating temperature range of 440 C. In advance, you can reduce the thickness reduction rate for p U m ^ and moxibustion thick mass%. Controlled within 25% ~ 50 300. / Technical ^, and when the temperature immediately before calendering has not been reduced to C, it is 230. (: Reheating is performed within a temperature range of ~ 440 t. The melting point of the magnesium alloy as the object of this and Mingzhong will change due to the alloy composition. Yes, take a value around 650 t. Because of this low melting point, The difference between the solidification temperature and the mold temperature is small, so if the casting conditions are wrong, solidification segregation or solidification cracking will occur during casting, or the casting meat will be defective due to the release of 3 components or the burning of the mold release. In the present invention, the casting conditions are controlled by the baking temperature, the casting temperature, and the thickness of the mold plate to avoid possible casting defects. In the present invention, the magnesium alloy is cast to obtain a plate thickness of 50 to 300 mm.

533100, description of the invention (7) 廑 thick block type ingot β-magnesium alloy system makes Ling contain the addition of aluminum, zirconium, :: Yuan American Institute of Experimental Materials Table division. In addition, when the plate thickness exceeds the upper limit, the hot rolling ::::: For some reasons, the thickness of the ingot is set to 50 ~ 300 mm. The width of the ingot can be arbitrarily set by the shape of the mold When obtaining this type of ingot, set the out-of-bath temperature immediately before the prayer to a temperature range that is more than the Mwot of the magnesium alloy. Out-of-bath temperature is lower than the lower limit temperature: The melt temperature is already close to the freezing point at the beginning of casting. Nearby, the solidification has begun before the completion of the process. The temperature outside the oven is higher than the upper limit temperature. ^^ Not only does the cooling time reach the casting temperature, but also the danger of X = Yu! Or fire. For these reasons: the temperature Range. Although the casting temperature is set to be higher than 30. (: the above temperature, but also: the melting point of the two gold points is 190. ^ 疋 is more than the town alloy: a temperature of 130 C or more. When the temperature is lower than the lower limit, and when the combined conductivity is higher than the upper limit, it is difficult to obtain a proper coagulation speed ... Some reasons' Set the washing temperature to the aforementioned temperature range formula 1Γ) The thickness of the mold can full The following mold plate thickness (mm) -1 · 85 10-4t2 + 2 23 · 6 ···· (1) two 98 Χ 10-Η + t X: the thickness of an ingot block type (mm)

Page 10 533100

The reason for setting the lower limit for the thick sound of thick block ingots is as follows. The thickness of the casting template of this article is based on the formula (η). The best solidification time is 2 ~ 30. The result of the research is determined. The slag on the melt becomes intolerable. The curing time is too low. At the lower limit, when floating, it will cause the knot height in the thick block to exceed the upper limit.

It has been found through experiments that in order to obtain a good second and: the relationship between the thickness of the inventor of the present invention as shown in Figure 1 and the formula (1) at time t, the thickness of the casting template and the lower limit of the ingot plate (1), will occur due to AA. Do not. g The thickness of the casting template is lower than the formula. In addition, the combustion of the release material leads to B ^ ^ /. The thickness of the template must be greater than the lower limit value, and the thickness of the transport layer must be thicker than the lower limit value, which will not affect the foregoing functions and effects of the present invention. The pre-heating of the mold is used to prevent poor casting. The temperature of the mold is 5 01 ~ 250 ° (: about the best, most preferably within the range of 18 0. 2 0 2 1. The mold / orphan degree is lower than the lower limit. "The cooling rate at the interface between the mold and the melt will be difficult to control", which will easily cause casting defects. In addition, when the mold temperature exceeds the upper limit, an appropriate cooling rate cannot be obtained. The washing speed is determined by the casting weight, but, If it is too slow, solidification segregation will occur, and if it is too fast, it will cause failure due to disordered melt flow; and it will be implemented within the range of 200 ~ 300 00 cm3 / sec. In actual operation, focus on the homogenization of thick blocks. Within 2 minutes. Next, in the present invention, the hot-rolling is performed without hot-forging. The inventor of the present invention confirmed that the hot-rolling was performed after heating to 180 ° C.

Page 11 533100 V. Description of the invention (9)

When the coil breaks at time A, the structure will be generated because of heating: 2:50, and then the hot-rolled rolling is carried out to implement the hot-rolled rolling, which must be considered ^ large *, I will not go through the hot-forged gold again. Above the crystallization temperature; = heating "cracking" is preferably in the temperature range of 180.044. ((Temperature range VV:,: :), preferably in the risk of segregation. Above this temperature range, the I am afraid that the 1 3 / 〇 branch is pressed. When pressed, until the final rolling, width = stomach R sheep asks the upper limit, no: go to prevent the end = spread. When the rolling rate is lower than the next few rolling: After the magnesium alloy thick block for rolling is passed through the block, the preheating temperature is 300t ~ 44 (rc " when the thickness of the town alloy for hot rolling is 25% ~ 50%. "Preheating" makes a re-force within the rolling reduction temperature range. If the thickness exceeds 60%, it will be at 23 (rc ~ 44 ° and not lower than 30 ...), at 23 ... ~ I: 2 Pressed: The degree is heated, and then reheated carefully, and then add 25% ~ 50% within the target range of the C service target, and get = 丨 the number of rolling lanes of the new # (a rolling reduction thickness Rolling coils with hot-rolled thickness of the desired thickness of I #. One roll; when the lower limit is 25%, continuous operation cannot be performed because of curling: When the rate of roll-reduction is higher than that of the upper gate, the material may be broken. Reheating When n; i "30 0 ° C, the material has the upper limit of breaking eutectic temperature:" Temperature 2, C ~ 440. "," If, again, the recrystallization temperature,

533100, Description of Invention (IQ) ^ The processing temperature is preferably paste. C ~ 43 () t :. During preheating, if the heat treatment temperature exceeds the eutectic temperature, re-heating will cause poor structure and impair processability. If it is processed, it will be known in practice by the Department of Repetitive Delays. The thickness of the reheating alloys implemented in different production lines is described below. In the hot rolling, The danger of magnesium T will increase. Therefore, the magnesium alloy machine should be used above. Ϊ = ϊ 'If the heating temperature must be higher than the recrystallization temperature for the purpose of realization, it is also possible to use high temperature and short time as much as possible. Efficiency. At this time, the heating temperature is, for example, 44 °. (: The other is the adjustment of the structure W '. In this case, the material temperature necessary for heating to the pressure delay time in a relatively short time (for example, more than 300t) 'The material is then conveyed to the calendering line to enter the calendering process. ^ With the present invention, hot-rolling can be performed without going through the hot-forging process, and a large-scale coil of magnesium alloy, for example, exceeding 200 kg can be produced. Implementation type] (First example) This example uses a magnesium alloy thick block equivalent to AZ21 (thickness 86 mm; width 400 mm; length 150 mm). The plate thickness of the first mold is given by the formula (1) Obtained using 2 5 Mild steel plate 'into a second shape of FIG. Shall enable the construction 4〇 X1 5 mm square square square

Page 13 533100 V. Description of the invention (11) Take out i f on one side. A mold release agent mainly composed of magnesium silicate was coated on the cast surface, and after drying, it was heated to about 2000 t with a burner.

i. The casting system was performed with a surface of 86 mm XI 50 mm as an upper surface. The magnesium alloy was melted in a burner heating furnace at 66 °. ^ Implement refining and degassing. Immediately before being released from the oven, it was heated to 72 ° ^ to make it overheated. ^ After being released from the oven to the second ladle, casting was performed at 690 ° C. The casting speed is set to 900 cm / sec. The time from casting to solidification is 6 minutes. After solidification, the surface of the ingot is processed (thickness 66 mm; width \ 00 mm; length 120 mm) Centimeters) to provide hot rolling. The thick block after casting k is protected by an inert gas, and a homogenization heat treatment is performed at a set temperature of 4 300 ° C for 3 hours. After the aforementioned homogenization heat treatment, the thick block having a width of 400 mm is laterally rolled to 37 mm. Two times of hot rolling, each with a rolling rate of 28%, so that the thickness of the plate is from 66 mm to 48 mm to 3 5 mils, and then heated (under the protection of an inert gas, the temperature is set at 4 3 〇π to implement 3 After 5 hours of heating), 5 hot-time grindings were carried out immediately and the rolling rate of each pass was 35%, so that the thickness of the plate was from 35 mm to 22.5 mm — 14.5 mm — 95 mm — 6.2 mm — 4.0 mm. Centimeters.

With the thick ingot obtained by the above steps, no coarse grains exceeding a diameter of several millimeters were found inside. Also, in the rolled coil, cracks due to coarse Ba particles occurred, and end cracks did not occur at the lateral ends. Therefore, it can be read that good rolling can be obtained by this method. (The first comparative example) The failure example of the thickness selection of the cast key plate is 2 in the same manner as in the first example. The millimeter thick prayer key is provided for inter-rail rolling. However, disk fatigue occurs. ",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, s, and ,,,,,,,,,,,,,,,,,,,,,,,, and, and in whom, they may be fine may be perpendicular to the direction of rolling,

S33l〇〇

V. Description of the invention (12) Some fine cracks are broken as a starting point. ~ Dissolve the thin turtle The thickness of the spiral plate caused by the floating of the intermediary fluid is too thin, which is the main cause of cracking. The internal defect is caused by the failure of the above-mentioned micro (second comparative example) casting template thickness selection example. "The ^^ must be polished away from the surface by several tens of millimeters, and breakage may occur during hot rolling." 3rd comparative example) Failure example of hot rolling. Under the conditions of the first embodiment, the hot rolling was directly performed on the cast key without lateral rolling. However, in the third rolling delay, about 30 mm occurred. The end is cracked. The manufacturing conditions and the results obtained in the first example and the first to third comparative examples are recorded in Table 1. [Table 1] The first manufacturing conditions and results of the magnesium alloy coil

Page 15 533100 V. Description of the invention (13) Item 1st treasure example 1st comparative example 2nd comparative example 3rd comparative example Thick block specification (mm) Thickness 86 20 80 86 Width 400 400 430 400 Length 1500 1500 1500 1500 鐯 template thickness (mm) 25 25 10 25 pound mold preheating temperature (r :) 200 220 200 180 baking temperature rc] 720 730 720 740 pouring temperature (r) 690 700 690 705 pounding speed (cm3 / s 〕 900 200 900 900 Homogenization heat treatment conditions (r :, hours) 430, 3 430, 3 430, 3 430, 3 Centrifugation conditions Width-wise percentage elongation (^) 7.5 7.2 7.3 0 Number of extensions 7 2 4 7 One calendar Delay rate [called] 28-35 25-30 25-40 28-40 delay rate before reheating (called) position-vomiting reheating conditions (r, small 畤) 430 > 3… — 430, 3 Final right pan thickness (mm) 4.0 9.8 16.5 4.0 Good results. Meat XX 〇 No coarsened crystal grains 〇X 〇 No cracks XXX Remarks Can be rolled out with good duo meat and no cracks Coiled material. Poor fleshing occurs, and the material breaks during the second rolling. Due to the improper solidification speed, the crystal grains in the year of production are coarsened, and cracks occur at the fourth time delay. Although a good nugget can be made, end cracks have occurred before the transverse rolling is performed. Example) This example uses a magnesium alloy thick block equivalent to AZ21 (thickness 170 mm; width 600 mm; length 150 mm). The plate thickness of the first mold is obtained by formula (1) It is necessary to use a 30 mm soft steel plate to form the shape shown in Figure 2. The construction must be able to be taken out from a single side of 600 mm X 1 500 mm. A release agent mainly composed of gasified magnesium will be used. Coated on the inner surface of this mold, dried, and then heated to about 200 ° C with a burner. The casting system uses the surface of 170 mm X 1 500 mm as the upper surface for casting.

Page 16 533100 V. Description of Invention (14). The 'magnesium alloy' is melted in a burner heating furnace, and refining and degassing are performed at 660 t. Immediately before the furnace is heated to 720 t: it is superheated, then it is discharged to the second ladle, and casting is performed at 690. The casting speed was set to 1 100 cm3 / sec. The time from casting to solidification was 6 minutes. After the solidification is completed, the surface of the ingot is processed (thickness 66 mm; width 400 mm ^ 1; length 12 000 mm) to provide hot rolling.

The thick block after prayer is protected by an inert gas, and a homogenization heat treatment is performed for 4 hours at a set temperature of 430 ° C. After the aforementioned homogenization heat treatment, the thick block with a width of 58 mm is laterally rolled to 534. Millimeter (8%), each rolling between 25 to 50% of the hot rolling, so that the thickness of the plate from 150 mm-mm 'reheating (under the protection of inert gas, at a set temperature of 43 0 ° C real hours Immediately after heating), a hot rolling calender L of 25 to 50% per rolling was carried out to reduce the plate thickness from 47 mm to 8 mm. According to the above steps, thick blocks and rolled coils were made. However, the obtained prayer-free key 'did not find any coarse crystal grains with diameters exceeding several millimeters. Also, in the microstructure after the intermediate rolling, no cracks due to coarse grains occurred at the lateral ends, and no end cracks occurred. Therefore, good rolling can be obtained by this method.

Failure ^ Comparative Example 4) The first preselected temperature of the mold preheating temperature and casting temperature was used. The same mold as in the second example was used, and the experiment was performed at a mold temperature of 4 ° and a casting degree of 650 c. In the middle of casting, the molten metal began to solidify, and f-melting = wrinkles, etc., caused poor casting. The surface defects of the obtained thick ingot were ground and then subjected to hot rolling. Delay in thermal pressure, self-existence

Page 17 Chuan ιυο V. Description of the invention (15) Defects in thick ingots (The fifth comparative example has cracks perpendicular to the rolling direction. Failure examples include the preheating temperature and the second use of washing ~ temperature selection. It is similar to the second embodiment. The casting temperature is 700. (: to f wire 杳 杈 绮 to mold / dish degree 275 C, pouring leads to poor quality of the cast meat such as welding, etc .. Because the solidification speed after casting is not appropriate, so After surface grinding, add the surface defects of the obtained thick ingot, and you will lose 1 ^ 4 cracks perpendicular to the rolling direction., "Comparative example of failure example) The preheating temperature of the mold and the third selected casting temperature Cast-Ϊ? Use 50 and Γth i2 Ϊ Example phase @ 之 模, the experiment was carried out at a mold temperature of 275 ° C, casting fox degree 750 C. Because the solidification speed after casting is not appropriate, resulting in coarsening of crystal grains. The ingot of the ingot is delayed under hot pressure, and cracks occur and break. The manufacturing conditions and results obtained in the second embodiment and the fourth to sixth comparative examples are recorded in Table 2. [Table 2] Town Alloy Coil Second production condition and result

18th stomach 533100 V. Description of the invention (16) 1 I 2nd example 4th comparative example 5th comparative example 6th comparative example Block size (mm) Degree 170 170 170 170 Width 600 600 600 600 Length 1500 1 pass 1300 1500 mold thickness [mm] 30 30 30 30 mold preheating temperature (=) 200 140 275 275 baking temperature rc] 720 720 720 720 pouring temperature (r :) 690 65Q 700 750 (Cm3 / sec) 1100 1100 1100 1100 Homogeneity Heat treatment conditions CC, hours) 430, 4 430, 4 430, 4 430, 4 Calendaring conditions Width rolling ratio [called] 8.1 9.2 7.3 8.3 Number of rolling 15 15 15 6 Extension rate at one time 膣 2 ^ -50 25-50 25-50 25-50 Elongation before reheating (coffee) 58 57 58 — Reheating conditions (t :, hours) 430, 4 430, 4 430, 4 — Final right ore (mm) 3.0 3.0 3.0 5.0 Good results cast meat 〇XXX No coarsened crystal grains 〇〇X No cracks 0 XXX Remarks can be extended to have good meat and no cracks at the ends Good coiled material. Because the conditions for construction are not appropriate, it is guided by fluid wrinkles. The defect caused is the starting point, and cracks are generated. Because the rule is not appropriate, the cracks are caused by the defects caused by firing, etc. Because the control conditions are not appropriate, the crystal grain coarsening part is in the 6th time. Delay, material breaks.

[Industrial possibilities]

According to the present invention, it is possible to carry out hot-rolling without going through the hot-forging process, and it is possible to produce, for example, a large-sized magnesium alloy coil exceeding 200 kg.

Page 19 533100 Brief description of the drawings Figure 1 shows the relationship between the thickness of the thick plate and the thickness of the mold plate which can obtain good thick blocks. Figure 2 shows the shape of the mold; Figure 2A is a front view; Figure 2B is a top view. Fig. 3 is a graph showing the relationship between the mold temperature and the casting temperature at which a good slab can be obtained. Schematic label description

Page 20

Claims (1)

? Magic ¥) 〇, amendment i Case No. 91117932 VI. Application; Scope-~ ^ §--tiL 1 · A method for hot-rolling magnesium alloy with a thickness of 'gold to obtain a plate thickness of 50 ~', Y The magnesium alloy is characterized by a 300-mm thick ingot-type ingot, in which the melting point is higher than the melting point of the town alloy by 5. Within this range, the melting temperature of the magnesium alloy melt is increased by ~ 50 ° C, and the washing and casting temperature household furnace with a temperature of 30 ° C ~ 130 t is higher than the melting point of the magnesium alloy. Within the dry area of the plate, add the alloy alloy melt 2. If the scope of the patent application is No. 1 J, you :, +, > Manufacturing method of the above block, in which the hot-rolled magnesium alloy is used for thickening In the method of core% die thickness relative to thick block and continuous di method, it is assumed that the thickness of ingot of formula 1 can satisfy the following (jade) thickness per plate (common @ \ 4 Λ + 23. 6 .... ⑴ -1. 85 X l〇-4t2 + 2. 98 X l〇-4t 3 t: Thickness of thick block type ingot (mm) Manufacture of block; /, special / middle range / 1 item 4. 4.Shenzhi direct brake # ， ~ Mold temperature is 50t ~ 25 ° C. Manufacturing method of the block \ 1 ^^ The magnesium alloy for hot rolling described in item 3 is thick. (Manufacturing method of TC 〇 block \ Special ^ Liwei Magnesium alloy for hot rolling as described in item 1 6. Thickness of a kind of drying, casting speed is 20 0 ~ 300 0 cm3 / s. For hot rolling, use 0 ^ The method of gold intercalating hot rolling includes the following steps: transverse rolling; and "the thickness of the gold nugget is 1 to 15% with respect to the width direction", and the method of hot rolling is performed on the plate thickness direction. F33_a on page 23; i. Λ. Amendment signing order ': r ...' Qian91117932 VI. Application for the scope of benefits, each of the 7 patents, and the patent scope of the magnesium alloy according to item 6 of the hot rolling method, in which the 'hot rolling process It is implemented in the range of hot-rolled gold temperature to eutectic temperature. ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-,,-,,,,,,,,,,,,,,,,,,,-,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the temperature range of 180 ° C to 44 ° C (9 ° C), such as the private law of the People's Republic of China in the sixth scope of the application for patents, in which Ding Guang is dissatisfied with the hot rolling method of magnesium alloys, The thickness of the gold nuggets has passed for a long time; :: = ,, one or two methods, in which the heat transfer of the town alloy described in the item ^ $ n6 is performed, so that i is reduced to achieve the gold nuggets passing …, The rolling is performed once after preheating ^ @ f is used for pre-rolling, and the thick block is used for pre-rolling, and the temperature is controlled in the temperature range of 25% to 50%; When the rate exceeds 6, the time is "at 23." The method of paving method described in item 6 of the patent scope of the method is to extend the track gate μ of the town alloy. Among them, the hot rolling process Jiang Yu is hot again. Between calendering ~ "4 ... When the preheating temperature 围 the thickness of the inner drought is expected, and _, and the temperature just before calendering has not dropped by two; two; page 24 Edge 1 91117 Muscle? When applying for patent range correction, reheating is performed within the temperature range of 230 V to V —, C. 1 ^ · A method for manufacturing a magnesium alloy thick block for hot-rolling, including the following steps: "将 Town alloy; iL ,,, f ^ Λ ^ ^ kk to obtain a plate thickness of 50 to 300 mm Block-type ingots, and 1 $ pairs of front slags are not forged in hot room, but hot rolled. • The magnesium alloy for hot rolling as described in item 12 of the scope of patent application II. Fork: Manufacturing method, wherein the ballast alloy is cast to obtain a plate-thickness, ingot-type thick block type ingot, The magnesium alloy melt is baked in a temperature range of 50 C ~ j 50 C which is higher than the melting point of the foregoing magnesium alloy. The washing is performed at a temperature 30 ° C ~ 130 ° C higher than the melting point of the magnesium alloy. Within the range of the casting temperature, the magnesium alloy is melted from t to the complex to be cast. 1 4 · The method for manufacturing magnesium alloy thick block for hot rolling as described in item 12 of the patent scope of Shenying, wherein the magnesium alloy is cast to obtain a plate thickness of 50 300 μm thick ingot The process is to set the thickness of the mold relative to the thickness of the thick block f ingot to meet the following (1) formula: Turntable thickness (mm)-1.85 X 10,2 + 2.98 X 10-H + 2 3 · 6 ··· · ( 1) t: Thickness of thick block type ingot (mm) 1 5 · The manufacturing method of magnesium alloy thick block for hot rolling as described in item 12 of the patent application scope, in #, the mold temperature is 50 ° C ~ 250. . . 16 · The manufacturing method of the magnesium alloy thick block for hot rolling according to item 15 of the scope of the patent application, wherein the mold temperature is 18 ° C ~ 22IKC. 17 · Magnesium alloy for hot rolling as described in item 12 of the scope of patent application Page 25 533100 Match No. 2 ^ 117932 — ^ Date 倐 Sixth, the scope of patent application Manufacture method of thick block ′ Among them, the washing and casting speed is 2000 ~ 3 0 0 0 c m3 / sec. 18. The method for manufacturing a magnesium alloy thick block for hot rolling as described in item 12 of the scope of patent application, wherein the step of applying hot rolling to the ingot without hot forging includes the following steps: The magnesium alloy thick block for hot rolling is subjected to a transverse rolling of 1 to 15% with respect to the width direction; and after the foregoing steps, the hot rolling is performed on the plate thickness direction. 19. The method for manufacturing a thick block of magnesium alloy for hot rolling as described in item 12 of the scope of application for a patent, wherein the hot rolling process is carried out within a range of recrystallization temperature to eutectic temperature of the magnesium alloy for hot rolling. 2 · The method for manufacturing a magnesium alloy thick block for hot rolling as described in item 12 of the scope of the patent application, wherein the hot rolling process is performed at 180 ° C ~ 440. (: Implemented within the temperature range. 21. The method for manufacturing a thick block of magnesium for hot rolling as described in item 12 of the scope of patent application, wherein the hot rolling rolling process passes the majority of the hot rolled magnesium for thick rolling. When rolling to reduce the thickness to achieve the desired thickness °, the thickness reduction rate of the secondary rolling is controlled at 25% to 50%, "; when the thickness exceeds 60%, reheating is implemented. A ^ Correction of magnesium alloy for hot rolling as described in item 12 of the scope of the patent application 4 = H manufacturing method 'wherein the hot rolling process uses the town name of hot rolling as the name of the town', "Han ghost rolling through many channels to reduce Thickness to achieve the desired gold thickness ί 〇 ° c ~ 440 ° c In the preheating temperature range, the hot rolling is combined with m Λ pre-Λ, and after the preheating, the thickness reduction rate of the secondary rolling is controlled. ", And rolling, and when the total thickness reduction rate exceeds 60%, Page 26 Case No. 91117932 said Amendment VI. Patent application range 230 ° C Reheating was performed within a temperature range of 440 ° C. 2 3 · The method for manufacturing a magnesium alloy thick block for hot rolling as described in item 12 of the scope of the patent application, wherein the hot rolling rolling step rolls the magnesium alloy thick block for hot rolling through a plurality of passes to reduce it. When it is thick enough to reach the desired thickness, the magnesium alloy thick block for hot rolling is preheated in the preheating temperature range of 300 ° C ~ 440 t. After the preheating, the thickness reduction rate of the rolling is controlled to 2 5% ~ 50% hot rolling, and when the temperature immediately before rolling has not been reduced to 30 ° C, reheating is performed within the temperature range of 230 ° C ~ 440 ° C. Page 27