Water-cooled cast roller and cast rolling method for wide magnesium alloy cast plate strip

Abstract

The invention provides a water-cooled cast roller and a cast rolling method for a wide magnesium alloy cast plate strip, and belongs to the technical field of metal material production. By means of the structural design that the annular water channels are arranged on the periphery of the roller body section, the roller core water inlet holes and the roller core water return holes are formed in the roller core, and every two annular water channels are provided with one independent circulation system and the independent circulation systems, it can be guaranteed that cooling water evenly enters each annular water channel from at least three positions on the circumference, the cooling uniformity is high, and the service life of the roller is prolonged. Cooling is more efficient and rapid, the device can meet the production requirement of magnesium alloy cast plate strips with the width larger than 1200 mm, the cast rolling production process of the magnesium alloy with the width larger than 1200 mm is more stable, and the plate erecting process is easier.

Description

Technical Field

[0001] The present invention relates to the technical field of metal material production, and more specifically, to a water-cooled casting and rolling roll and a method for casting and rolling wide-width magnesium alloy cast plates and strips. Background Art

[0002] Magnesium alloys have the characteristics of low density, high specific strength and specific stiffness, good damping performance, excellent electromagnetic shielding performance, radiation resistance, etc. Therefore, magnesium alloys have important application values and broad application prospects in the fields of automobiles, electronics, electrical appliances, aerospace, national defense and military industries, transportation, etc.

[0003] The new energy vehicle industry is developing rapidly. New energy vehicles are very sensitive to the overall weight. Therefore, the demand for magnesium alloy materials is also increasing day by day. Magnesium alloy plate and strip products can be mainly applied to the "four doors and two covers" of automobiles, covering parts, seat back panels, notebook casings, etc., and have very good application prospects and markets. The continuous casting and rolling production of magnesium alloy coil plates is a high-end and efficient technology for the production of magnesium alloy plate and strip products at present. The key component that determines the forming of the vertical plate and stable production in magnesium alloy casting and rolling is the casting and rolling roll. The cooling and forming of the magnesium alloy melt and rolling are inseparable from the casting and rolling roll, especially for the casting and rolling of wide-width magnesium alloys.

[0004] At present, the wide-width magnesium alloy casting and rolling equipment is still relatively backward, and the market is mainly based on narrow-band casting and rolling production. Most of the magnesium alloy casting and rolling production lines are narrow-band production lines of about 600 mm. There is a lack of casting and rolling rolls specifically for the production of wide-width magnesium alloy casting and rolling, which is not suitable for the production of wide-width magnesium alloy cast plates and strips above 1200 mm. Moreover, there are problems such as the uniformity in the width direction of the magnesium alloy plate and strip and the high efficiency of cooling not meeting the production requirements of wide-width magnesium alloys. Summary of the Invention

[0005] In view of the above problems, the purpose of the present invention is to provide a water-cooled casting and rolling roll and a method for casting and rolling wide-width magnesium alloy cast plates and strips to solve the problems in the prior art that there is a lack of a water-cooled casting and rolling roll suitable for a wide-width magnesium alloy cast plate and strip production line above 1200 mm, and the existing magnesium alloy casting and rolling equipment is mainly based on narrow-band casting and rolling production, and there are problems such as the uniformity in the width direction of the magnesium alloy plate and strip and the high efficiency of cooling not meeting the production requirements of wide-width magnesium alloys when used for the production of wide-width magnesium alloys.

[0006] The water-cooled casting and rolling roll provided by the present invention includes a roll core, a water-cooled rotary joint and a roll core rotary mounting mechanism; wherein,

[0007] The roll core includes a roll body section, roll neck sections arranged at both ends of the roll body section, and a roll core water inlet hole and a roll core water return hole arranged inside the roll core along the length direction of the roll core;

[0008] An annular water channel is arranged on the outer periphery of the roll body section, and partitions are arranged between adjacent annular water channels; an independent circulation system is arranged for every two annular water channels; the independent circulation system includes at least three annular water channel return holes arranged on the partition between two annular water channels and at least three annular water channel inlet holes evenly distributed on the circumference of each annular water channel corresponding to the annular water channel return holes; the annular water channel return holes are connected to the roll core return holes; the annular water channel inlet holes are connected to the roll core inlet holes;

[0009] The water-cooled rotary joint is arranged at the end of the roll core, and a water inlet channel connected to the water inlet of the roll core inlet hole and a water return channel connected to the water return port of the roll core return hole are arranged inside the water-cooled rotary joint; the water-cooled rotary joint is connected with a workshop water-cooled circulation pipeline;

[0010] The roll core rotary mounting mechanism is arranged on the roll neck section.

[0011] In addition, a preferred solution is that the number of the roll core return holes is one and is arranged in the middle of the roll core; the numbers of the roll core inlet holes and the annular water channel inlet holes are both three; on the same annular water channel, each annular water channel inlet hole is correspondingly connected to one roll core inlet hole; the three roll core inlet holes are evenly distributed on the outer periphery of the roll core return hole.

[0012] In addition, a preferred solution is that on the circumferential side of the roll body of the roll core, the included angle between the annular water channel inlet hole and the annular water channel return hole is 60°.

[0013] In addition, a preferred solution is that a roll sleeve is sleeved on the outer periphery of the roll body section; the roll sleeve and the roll body section are in interference fit.

[0014] In addition, a preferred solution is that a casting roll sealing cover is arranged at the ends of the roll body section and the roll sleeve; a sealing structure is arranged between the casting roll sealing cover, the roll body section and the roll sleeve.

[0015] In addition, a preferred solution is that the sealing structure is a heat-resistant double-lip sealing form structure.

[0016] In addition, a preferred solution is that a WC-Co gradient transition layer is arranged on the outer side of the roll core.

[0017] In addition, a preferred solution is that the roll core rotary mounting mechanism includes a tapered roller bearing sleeved on the roll neck section, a bearing housing arranged outside the tapered roller bearing and bearing housing end covers arranged at both ends of the bearing housing; a positioning retaining ring is arranged between the outer end of the roll neck section and the bearing housing end cover.

[0018] In addition, preferably, the number of the tapered roller bearings is at least four rows.

[0019] The wide-width magnesium alloy cast plate strip casting and rolling method provided by the present invention uses the water-cooled casting and rolling roll as described above to cast and roll the magnesium alloy material to obtain the magnesium alloy cast plate strip.

[0020] As can be seen from the above technical solutions, for the water-cooled casting and rolling roll and the wide-width magnesium alloy cast plate strip casting and rolling method provided by the present invention, by arranging an annular water channel on the outer circumference of the roll body section, arranging a roll core water inlet hole and a roll core water return hole inside the roll core, and arranging an independent circulation system for every two annular water channels, and the independent circulation system includes at least three annular water channel water return holes arranged on the partition between the two annular water channels and at least three annular water channel water inlet holes evenly distributed on the circumference of each annular water channel corresponding to the annular water channel water return holes, the annular water channel water return hole is connected to the roll core water return hole; the annular water channel water inlet hole is connected to the roll core water inlet hole, which can ensure that each annular water channel uniformly enters the cooling water at least from three places on the circumference, so that the cooling uniformity is high, and the cooling is more efficient and rapid, and it can meet the production requirements of wide-width magnesium alloy cast plate strips above 1200 mm, making the wide-width magnesium alloy casting and rolling production process more stable and the standing plate process easier. The present invention has the advantages of reasonable cooling water flow distribution, high cooling efficiency, good cooling uniformity, being able to withstand large rolling forces, high plate shape control quality, long service life, etc.

[0021] To achieve the above and related purposes, one or more aspects of the present invention include the features that will be described in detail later. The following description and the accompanying drawings illustrate certain exemplary aspects of the present invention in detail. However, these aspects only indicate some of the various ways in which the principles of the present invention can be used. In addition, the present invention aims to include all these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By referring to the following content of the description in conjunction with the drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more obvious and easier to understand.

[0023] Figure 1 is a schematic structural diagram of a water-cooled casting and rolling roll according to an embodiment of the present invention;

[0024] Figure 2 is a schematic structural diagram of a roll core according to an embodiment of the present invention;

[0025] Figure 3 is a structural design diagram of the roll core water inlet and return holes and the annular water channel water inlet and return holes according to an embodiment of the present invention;

[0026] Figure 4 is another structural design diagram of the roll core water inlet and return holes and the annular water channel water inlet and return holes according to an embodiment of the present invention;

[0027] Figure 5 Another structural design diagram of the water inlet and outlet holes of the roll core and the water inlet and outlet holes of the annular water channel according to an embodiment of the present invention;

[0028] Figure 6 Structural diagram of the annular water channel according to an embodiment of the present invention;

[0029] Figure 7 Structural layout diagram of the annular water channel return hole and the annular water channel in the roll body section according to an embodiment of the present invention;

[0030] Figure 8 Structural layout diagram of the annular water channel inlet hole and the annular water channel in the roll body section according to an embodiment of the present invention;

[0031] Figure 9 Structural design diagram of the sealing structure and the stainless steel covering layer of the roll core according to an embodiment of the present invention;

[0032] Figure 10 Flow field simulation diagram of the annular water channel of the water-cooled casting roll according to an embodiment of the present invention;

[0033] Figure 11 Simulation diagram of the rolling process of the water-cooled casting roll according to an embodiment of the present invention.

[0034] In the drawings, 1 - roll core, 11 - roll body section, 12 - roll neck section, 13 - roll core water inlet hole, 14 - roll core water return hole, 15 - annular water channel, 16 - partition, 17 - annular water channel inlet hole, 18 - annular water channel return hole, 2 - water-cooled rotary joint, 31 - tapered roller bearing, 32 - bearing seat, 33 - bearing seat end cover, 34 - positioning retaining ring, 35 - fixed round nut, 4 - roll sleeve, 5 - casting roll sealing cover, 6 - sealing structure, 7 - stainless steel covering layer, 8 - WC-Co gradient transition layer.

[0035] In all the drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed implementation manners

[0036] In view of the foregoing, in the prior art, there is a lack of a water-cooled casting roll applicable to a wide-width magnesium alloy casting strip production line of more than 1200 mm. The existing magnesium alloy casting equipment is mainly for narrow-strip casting production, and there are problems such as the uniformity in the width direction of the magnesium alloy strip and the high efficiency of cooling cannot meet the production requirements of wide-width magnesium alloy when used for producing wide-width magnesium alloy. A water-cooled casting roll and a casting method for wide-width magnesium alloy casting strip are proposed.

[0037] The following will describe in detail the specific embodiments of the present invention with reference to the drawings.

[0038] In order to illustrate the water-cooled casting roll and the casting method for wide-width magnesium alloy casting strip provided by the present invention,Figure 1 Shows the structure of a water-cooled casting and rolling roll according to an embodiment of the present invention; Figure 2 Shows the structure of a roll core according to an embodiment of the present invention; Figure 3 Shows the structural design of the roll core inlet and return water holes and the annular water channel inlet and return water holes according to an embodiment of the present invention; Figure 4 Shows another structural design of the roll core inlet and return water holes and the annular water channel inlet and return water holes according to an embodiment of the present invention; Figure 5 Shows another structural design of the roll core inlet and return water holes and the annular water channel inlet and return water holes according to an embodiment of the present invention; Figure 6 Shows the annular water channel structure according to an embodiment of the present invention; Figure 7 Shows the structural arrangement of the annular water channel return water holes and the annular water channel in the roll body section according to an embodiment of the present invention; Figure 8 Shows the structural arrangement of the annular water channel inlet water holes and the annular water channel in the roll body section according to an embodiment of the present invention; Figure 9 Shows the structural design of the sealing structure and the stainless steel covering layer of the roll core according to an embodiment of the present invention; Figure 10 Shows the flow field simulation of the annular water channel of the water-cooled casting and rolling roll according to an embodiment of the present invention; Figure 11 Shows the simulation of the rolling process of the water-cooled casting and rolling roll according to an embodiment of the present invention.

[0039] As Figures 1 to 11 Collectively shown, the water-cooled casting and rolling roll provided by the present invention mainly includes a roll core 1, a water-cooled rotary joint 2, and a roll core rotary mounting mechanism; wherein,

[0040] The roll core 1 includes a roll body section 11, roll neck sections 12 provided at both ends of the roll body section 11, and a roll core inlet water hole 13 and a roll core return water hole 14 provided inside the roll core 1 along the length direction of the roll core 1;

[0041] An annular water channel 15 is provided on the outer periphery of the roll body section 11, and a partition 16 is provided between adjacent annular water channels 15; an independent circulation system is provided for every two annular water channels 15; the independent circulation system includes at least three annular water channel return water holes 18 provided on the partition 16 between the two annular water channels 15 and at least three annular water channel inlet water holes 17 evenly distributed on the circumference of each annular water channel 15 corresponding to the annular water channel return water holes 18; the annular water channel return water holes 18 are connected to the roll core return water holes 14; the annular water channel inlet water holes 17 are connected to the roll core inlet water holes 13;

[0042] The water-cooled rotary joint 2 is provided at the end of the roll core 1, and an inlet water channel connected to the water inlet of the roll core inlet water hole 13 and a return water channel connected to the water return port of the roll core return water hole 14 are provided inside the water-cooled rotary joint 2; the water-cooled rotary joint 2 is connected to a workshop water-cooled circulation pipeline;

[0043] The roll core rotary mounting mechanism is provided on the roll neck section 12.

[0044] Specifically, the water-cooled rotary joint 2 is connected to the workshop water-cooling circulation pipeline, and the cooling water circulates into the roll core 1. The water-cooled rotary joint 2 can ensure the stable rotation of the connection part with the roll core 1 when the water-cooled casting roll rotates, and the connection part with the cooling circulation pipeline is fixed. The water-cooled rotary joint 2 preferably adopts a dynamic pressure balance interface design and is connected to the end water inlet of the roll core 1 to optimize the water flow stability during rotation and reduce the turbulence loss. The water-cooled rotary joint 1 is preferably but not limited to being connected to the end of the roll core 1 by bolts.

[0045] The annular water channels 15 are evenly arranged on the roll body section 11, and the distance between each annular water channel 15 is the same. The roll core water inlet hole 13 and the roll core water return hole 14 are connected to the annular water channel 15 through the annular water channel water inlet hole 17 and the annular water channel water return hole 18 to form a complete cooling water path.

[0046] The number of the annular water channels 15 is several.

[0047] By arranging the annular water channels 15 on the outer periphery of the roll body section 11, arranging the roll core water inlet hole 13 and the roll core water return hole 14 inside the roll core 1, and setting up an independent circulation system for every two annular water channels 15, and the independent circulation system includes at least three annular water channel water return holes 18 arranged on the partition 16 between the two annular water channels 15 and at least three annular water channel water inlet holes 17 evenly distributed on the circumference of each annular water channel 15 corresponding to the annular water channel water return hole 18. The annular water channel water return hole 18 is connected to the roll core water return hole 14; the annular water channel water inlet hole 17 is connected to the roll core water inlet hole 13, which can ensure that each annular water channel 15 uniformly enters the cooling water from at least three places on the circumference, so that the cooling uniformity is high, and the cooling is more efficient and rapid, and it can meet the production requirements of magnesium alloy casting plates with a width of more than 1200 mm, making the production process of wide-width magnesium alloy casting and rolling more stable and the standing plate process easier.

[0048] As a preferred solution of the present invention, the number of the roll core water return holes 14 is one and is arranged in the middle of the roll core 1; the numbers of the roll core water inlet holes 13 and the annular water channel water inlet holes 17 are both three; on the same annular water channel, each annular water channel water inlet hole 17 is correspondingly connected to a roll core water inlet hole 13; the three roll core water inlet holes 13 are evenly distributed on the outer periphery of the roll core water return hole 14.

[0049] Specifically, as Figures 3 to 5 shown, a roll core water return hole 14 is arranged along the length direction at the inner center position of the roll core 1, three roll core water inlet holes 13 are evenly arranged on the outer periphery of the roll core water return hole 14, three annular water channel water inlet holes 17 are evenly arranged on the roll body section 11, and each annular water channel water inlet hole 17 is correspondingly connected to a roll core water inlet hole 13, so as to divide the annular water channel 15 into three cooling water inlet points to make the cooling more uniform.

[0050] It should be noted that: the number of the return water holes 14 of the roll core, the water inlet holes 13 of the roll core, the water inlet holes 17 of the annular water channel, and the return water holes 18 of the annular water channel can be set according to actual needs, and the present invention does not make special limitations on this.

[0051] The size selection of the water inlet holes 13 of the roll core and the return water holes 14 of the roll core can be calculated according to the following formula:

[0052] Q = [q1(t1 - t2) + q2(t2 - t3) + q3]m;

[0053] Wherein, Q is the total heat to be taken away per unit time, m is the casting and rolling output, t1 is the melt temperature, t2 is the melting point of the magnesium alloy, t3 is the temperature of the solid magnesium alloy strip blank, q1 is the specific heat capacity of the melt, q2 is the specific heat capacity of the solid state, and q3 is the latent heat of fusion;

[0054]

[0055] Among them, Q 水 is the cooling water flow rate, t4 is the outlet temperature of the casting and rolling roll, t5 is the inlet temperature of the casting and rolling roll, and q 水 is the specific heat capacity of the cooling water;

[0056]

[0057] Among them, d w is the water hole size (the water inlet hole 13 of the roll core or the return water hole 14 of the roll core), V is the water flow velocity, and n is the number of water holes (the water inlet hole 13 of the roll core or the return water hole 14 of the roll core). That is, the sizes of the water inlet holes 13 of the roll core and the return water holes 14 of the roll core can both be calculated according to this formula. Among them, V can be determined by experience value, and whether it is reasonable can be finally verified through simulation. n is also temporarily determined by itself, and then the sizes of the inlet and outlet water holes are calculated.

[0058] As a preferred embodiment of the present invention, on the circumferential side of the roll body of the roll core 1, the included angle between the water inlet hole 17 of the annular water channel and the return water hole 18 of the annular water channel is 60°.

[0059] Specifically, as Figures 3 to 5 shown, the arrangement of the water inlet holes 13 of the roll core and the return water holes 14 of the roll core on the end face of the roll core 1 is three holes for water inlet and one hole for water return. The water inlet holes 17 of the annular water channel and the return water holes 18 of the annular water channel are spaced 60° on the circumference of the roll body section 11, so as to achieve that the overall temperature difference of the wide-width magnesium alloy sheet is ≤ 10°C. The arrangement modes of the water inlet holes 17 of the annular water channel and the return water holes 18 of the annular water channel in the roll core 1 mainly include Figure 3 , Figure 4 , Figure 5There are three. There are three annular water channel inlet holes 17 distributed on each annular water channel 15, and there are three annular water channel return holes 18 distributed at the partition 16 between every two annular water channels 15. Every two annular water channels 15 form a small circulating water path to improve the cooling efficiency and reduce the water temperature difference between the inlet and outlet of the casting and rolling roll.

[0060] It should be noted that: the internal flow direction of the roll core 1 includes but is not limited to Figures 3 to 5 The three schemes shown. The casting and rolling roll and the internal cooling system are designed for the production of magnesium alloy casting and rolling with a width of more than 1200 mm, so as to ensure higher cooling efficiency and cooling uniformity under a wide width and meet the working condition requirements of higher rolling force in the production of wide-width magnesium alloy casting and rolling.

[0061] As a preferred embodiment of the present invention, a roll sleeve 4 is sleeved on the outer periphery of the roll body section 11; the roll sleeve 4 is in interference fit with the roll body section 11.

[0062] As a preferred embodiment of the present invention, a casting and rolling roll sealing cover 5 is provided at the ends of the roll body section 11 and the roll sleeve 4; a sealing structure 6 is provided between the casting and rolling roll sealing cover 5, the roll body section 11 and the roll sleeve 4.

[0063] As a preferred embodiment of the present invention, the seal is a heat-resistant double-lip seal form structure; the sealing structure 6 is made of silicone rubber.

[0064] Specifically, the sealing structure 6 preferably adopts a uniquely designed double-lip seal form to ensure the stability of the water system of the casting and rolling roll during operation. The sealing material of the sealing structure 6 selects a material with high heat resistance, such as silicone rubber, but is not limited to silicone rubber. The casting and rolling roll sealing cover 5 fixes the sealing structure 6 between the roll core 1 and the roll sleeve 4.

[0065] As a preferred embodiment of the present invention, a stainless steel covering layer 7 is welded by embedding on the outer side of the roll body section 11; the thickness of the stainless steel covering layer 7 is greater than the depth of the annular water channel 15.

[0066] As a preferred embodiment of the present invention, a WC-Co gradient transition layer 8 is provided on the outer side of the roll core 1.

[0067] Specifically, the roll body section 11 is preferably designed to form a stainless steel covering layer 7 with a certain thickness by welding 3Cr13 stainless steel powder by embedding, and a WC-Co gradient transition layer 8 is sprayed by plasma on the outermost side of the roll core 1 to balance the heat transfer efficiency and reduce the interfacial stress caused by the thermal expansion difference between the roll core 1 and the roll sleeve 4, thereby improving the strength and service life of the casting and rolling roll.

[0068] As a preferred embodiment of the present invention, the roll core rotation mounting mechanism includes tapered roller bearings 31 sleeved on the roll neck section 12, a bearing housing 32 disposed outside the tapered roller bearings 31, and bearing housing end covers 33 disposed at both ends of the bearing housing 32; a positioning retaining ring 34 is provided between the outer end of the roll neck section 12 and the bearing housing end cover 33.

[0069] As a preferred embodiment of the present invention, the number of tapered roller bearings 31 is at least four rows.

[0070] Specifically, at least four rows of tapered roller bearings 31, a bearing housing 32, bearing housing end covers 33, a positioning retaining ring 34, and a fixing round nut 35 are mounted on the roll neck section 12. The at least four rows of tapered roller bearings 31 and the bearing housing 32 transfer the rolling force during the casting and rolling process to the casting and rolling mill housing, making the operation more stable, extending the service life, ensuring the consistency of the products produced by casting and rolling, and achieving better shaping.

[0071] It should be noted that: the type of the tapered roller bearings 31 is not limited to tapered roller bearings; the number of the tapered roller bearings 31 is preferably but not limited to at least four rows, and can be one row, two rows, three rows, four rows, five rows, six rows, etc., and the present invention does not make special limitations thereto.

[0072] After the cooling water channel design of the roll core 1 of the present invention is completed, finite element simulation is carried out on it. The results show that the overall flow field velocity is mainly between 1.2 - 3.2 m / s, which meets the requirements of the cooling field design. There is no local dead zone in the flow field during the wide-width magnesium alloy casting and rolling production process, and it has good effects, as Figure 10 shown.

[0073] After the design of the cooling casting and rolling roll is completed, finite element simulation of the casting and rolling process is carried out on it. The temperature change of the magnesium alloy melt in the casting and rolling area is stable, and the temperature at the casting and rolling outlet is mainly 580 - 727 K, which meets the requirements of the outlet strip temperature for magnesium alloy casting and rolling production. It can be proved that the design of the casting and rolling roll cooling system for 1200 mm wide-width magnesium alloy casting and rolling production of the present invention meets the requirements. As Figure 11 shown.

[0074] The wide-width magnesium alloy casting and rolling method provided by the present invention uses the water-cooled casting and rolling roll provided by the present invention as described above to cast and roll the magnesium alloy material to obtain a wide-width magnesium alloy casting and rolling strip.

[0075] As can be seen from the above specific embodiments, the water-cooled casting roll and the casting and rolling method for wide-width magnesium alloy casting strip provided by the present invention are characterized in that an annular water channel is arranged on the outer periphery of the roll body section, a roll core water inlet hole and a roll core water return hole are arranged inside the roll core, and an independent circulation system is arranged for every two annular water channels. The independent circulation system includes at least three annular water channel water return holes arranged on the partition between the two annular water channels and at least three annular water channel water inlet holes evenly distributed on the circumference of each annular water channel corresponding to the annular water channel water return holes. The annular water channel water return holes are connected to the roll core water return hole; the annular water channel water inlet holes are connected to the roll core water inlet hole, which can ensure that each annular water channel evenly enters cooling water from at least three places on the circumference, so that the cooling uniformity is high, and the cooling is more efficient and rapid. It can meet the production requirements of wide-width magnesium alloy casting strips over 1200 mm, making the production process of wide-width magnesium alloy casting and rolling more stable and the standing plate process easier. The present invention has the advantages of reasonable cooling water flow distribution, high cooling efficiency, good cooling uniformity, being able to withstand large rolling forces, high plate shape control quality, and long service life.

[0076] As described above by way of example with reference to the accompanying drawings, the water-cooled casting roll and the casting and rolling method for wide-width magnesium alloy casting strip according to the present invention are presented. However, those skilled in the art should understand that various improvements can be made to the above-mentioned water-cooled casting roll and the casting and rolling method for wide-width magnesium alloy casting strip of the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the appended claims.

Claims

1. A water-cooled casting and rolling roll, characterized in that, It includes a roll core, a water-cooled rotary joint, and a roll core rotary mounting mechanism; wherein, the roll core includes a roll body section, roll neck sections provided at both ends of the roll body section, and a roll core water inlet hole and a roll core water return hole provided inside the roll core along the length direction of the roll core; an annular water channel is provided on the outer periphery of the roll body section, and partitions are provided between adjacent annular water channels; each two annular water channels form an independent circulation system; the independent circulation system includes at least three annular water channel water return holes provided on the partition between two annular water channels and at least three annular water channel water inlet holes evenly distributed on the circumference of each annular water channel corresponding to the annular water channel water return holes; the annular water channel water return holes are connected to the roll core water return holes; the annular water channel water inlet holes are connected to the roll core water inlet holes; the water-cooled rotary joint is provided at the end of the roll core, and a water inlet channel connected to the water inlet of the roll core water inlet hole and a water return channel connected to the water return port of the roll core water return hole are provided inside the water-cooled rotary joint; the water-cooled rotary joint is connected to a workshop water-cooling circulation pipeline; the roll core rotary mounting mechanism is provided on the roll neck section.

2. The water-cooled casting roll according to claim 1, wherein the number of the roll core water return holes is one and is provided in the middle of the roll core; the numbers of the roll core water inlet holes and the annular water channel water inlet holes are both three; on the same annular water channel, each annular water channel water inlet hole is correspondingly connected to one of the roll core water inlet holes; the three roll core water inlet holes are evenly distributed on the outer periphery of the roll core water return hole.

3. The water-cooled casting roll according to claim 1, wherein on the circumferential side of the roll body of the roll core, the included angle between the annular water channel water inlet hole and the annular water channel water return hole is 60°.

4. The water-cooled casting roll according to claim 1, wherein a roll sleeve is sleeved on the outer periphery of the roll body section; the roll sleeve and the roll body section are in interference fit.

5. The water-cooled casting roll according to claim 4, wherein a casting roll seal cover is provided at the ends of the roll body section and the roll sleeve; a sealing structure is provided between the casting roll seal cover, the roll body section, and the roll sleeve.

6. The water-cooled casting roll according to claim 5, wherein the sealing structure is a heat-resistant double-lip seal form structure.

7. The water-cooled casting roll according to claim 1, wherein a WC-Co gradient transition layer is provided on the outer side of the roll core.

8. The water-cooled casting roll according to claim 1, wherein the roll core rotary mounting mechanism includes a tapered roller bearing sleeved on the roll neck section, a bearing housing provided outside the tapered roller bearing, and bearing housing end covers provided at both ends of the bearing housing; a positioning retaining ring is provided between the outer end of the roll neck section and the bearing housing end cover.

9. The water-cooled casting roll according to claim 8, wherein the number of the tapered roller bearings is at least four rows.

10. A method for continuous casting and rolling of wide magnesium alloy cast plates, characterized in that, The water-cooled casting roll according to any one of claims 1-9 is used for casting and rolling a magnesium alloy material to obtain a wide-width magnesium alloy cast plate strip.

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