CN108500238A - A kind of production method based on electroslag remelting bimetallic composite roll - Google Patents

Abstract

The invention discloses a production method of a double-metal composite roll based on electroslag remelting, and belongs to the technical field of electroslag remelting. The present invention includes an eccentric crystallizer, a bottom water tank and a metal consumable electrode; the eccentric crystallizer includes an upper crystallizer and a lower crystallizer, the diameter of the lower crystallizer is smaller than the diameter of the upper crystallizer, and the lower crystallizer is arranged on The lower part of the upper crystallizer, and the axes of the upper crystallizer and the lower crystallizer are not on the same straight line; the metal consumable electrode is arranged on the upper part of the upper crystallizer, and the bottom water tank is arranged on the lower part of the lower crystallizer, The metal consumable electrode and the bottom water tank are respectively connected with the two poles of the power supply. Through the eccentric design of the electroslag remelting crystallizer, the present invention realizes the production of bimetallic composite rolls in which the working surface material is uniformly coated on the surface of the roll core and firmly welded, and the working surface material can be flexibly adjusted, the production is efficient, and the product The quality is superior.

Description

A production method based on electroslag remelting bimetal composite roll

technical field

The invention belongs to the technical field of electroslag remelting, and more specifically relates to a production method of bimetal composite rolls based on electroslag remelting.

Background technique

The consumption of wear-resistant parts in metallurgy, mining and other industries is very large, and many parts fail due to wear. If the wear-resistant parts such as rolls, jaw plates, and hammer heads are made of high-hardness materials as a whole, it will not only increase the production cost, but also increase the difficulty of machining the non-working surface. For this reason, bimetallic composite materials came into being, that is, the working surface is made of high hardness, good wear resistance, and relatively expensive materials, while the non-working surface is made of high toughness or good processing performance and relatively cheap materials, so that both Economical, reasonable and safe.

The most typical and widely used bimetallic composite materials are metallurgical rolls, which are the main large-scale tools for rolling steel. The outer material of the roll and the roll core are made of different materials, which can not only meet the requirements of the rolling mill for wear resistance and thermal fatigue resistance of the roll body, but also ensure the strength and toughness of the core and roll neck, and more importantly, greatly reduce The manufacturing cost of the roll is reduced. Taking high-speed steel rolls as an example, if the rolls are made of integral high-speed steel materials, the cost is expensive; if bimetal composite rolls are used, that is, the roll core is made of low-priced low-alloy steel, and the roll body is made of high-speed steel, the cost will be greatly reduced.

After retrieval, the name of the invention is: a liquid electroslag roll composite device (application number: 201120453174.5, application date: 2011.11.16), the device includes: a water-cooled crystallizer, the water-cooled crystallizer has a A channel with an inner diameter equivalent to the outer diameter of the preset composite layer; the upper part of the crystallizer is also provided with a device for pouring pre-melted molten metal into the gap between the water-cooled crystallizer and the roll to be composited inserted into the channel and intermediate holding furnace for slag liquid. This application is by setting the water-cooled crystallizer and the intermediate holding furnace that pours molten metal liquid and slag liquid into the gap between the water-cooled crystallizer and the roll to be compounded, so that the roll can be directly compounded, but the device produced The welding effect between the roll body material and the roll core material may not be ideal, and the molten metal is likely to be mixed during the pouring process, which affects the quality of the working surface.

It is also proposed to use electroslag remelting to produce rolls. Due to the use of electroslag remelting technology, the surface of the roll core is always in high-temperature slag, so there will be a thin layer of melting on the surface. Due to the protection of high-temperature slag , the molten layer is isolated from the air to ensure its purity; at the same time, the outer metal is slowly melted under the action of high-temperature slag, and then effectively welded to the surface of the roller core, thereby ensuring that the bimetal composite interface has good metallurgical quality, but At present, in the field of roll production, especially in the field of cold rolls, the main roll is the whole roll, that is, through the process of electroslag remelting and re-forging, the production and use costs are relatively high.

Therefore, through the method of electroslag remelting, a bimetal composite roll is developed, and its application in the field of cold rolling can not only greatly reduce the production cost of cold rolls, but also has important significance for the development of electroslag technology.

Contents of the invention

1. The technical problem to be solved by the invention

The purpose of the present invention is to overcome the problem that the existing bimetallic composite roll production technology cannot efficiently produce high-quality bimetallic composite rolls, and provides a production method based on electroslag remelting bimetallic composite rolls, through electroslag remelting crystallization The eccentric design of the device realizes the production of bimetallic composite rolls in which the working surface material is evenly coated on the surface of the roll core and firmly welded, and the working surface material can be adjusted flexibly, with high production efficiency and superior product quality.

2. Technical solution

In order to achieve the above object, the technical scheme provided by the invention is:

A kind of production method based on electroslag remelting bimetal composite roll of the present invention, the steps of method are:

Step 1. Place the inner metal

The metal consumable electrode is placed above the smelting side of the upper crystallizer, the roll core is placed in the lower mold as the inner layer metal of the composite roll, and the bottom water tank supports the roll core at the bottom of the lower mold;

Step 2. Electroslag remelting

The heavy slag is melted and poured into the eccentric crystallizer to form a slag pool, and one end of the metal consumable electrode is inserted into the slag pool, and the metal consumable electrode is electrically connected with the bottom water tank to form an electrical circuit; the metal consumable electrode is melted, Enter the molten pool after refining;

Step 3. Outer layer metal solidification and welding

The molten metal in the molten pool is cooled and solidified and welded to the surface of the roll core to form the inner layer metal of the composite roll to obtain a bimetallic composite roll.

Preferably, the eccentric crystallizer includes an upper crystallizer and a lower crystallizer, the diameter of the lower crystallizer is smaller than the diameter of the upper crystallizer, the lower crystallizer is arranged at the lower part of the upper crystallizer, and the upper crystallizer and the lower crystallizer The axes are not on the same straight line.

Preferably, the inner diameter of the lower crystallizer is D, the thickness of the working surface of the production roll is h, and the diameter of the roll core is d, where d=D-2h.

Preferably, an electromagnetic stirring coil is provided outside the upper mold, and the electromagnetic stirring coil is used to stir the molten metal in the upper mold.

Preferably, the metal consumable electrode is melted into molten metal and enters the slag pool, and then is distributed in the slag pool above the opening side through the diversion function of the diversion dam.

Preferably, a vibrating mechanism is provided at the upper end of the lower crystallizer, and the vibrating mechanism is used to vibrate the molten metal during the solidification process.

Preferably, the diameter of the upper crystallizer is R, the diameter of the lower crystallizer is r, and R≥2r.

Preferably, the angle between the upstream surface of the diversion dam and the bottom end surface is α=30°-45°, and the angle between the backflow surface of the diversion dam and the bottom end surface is β=60°-80°.

Preferably, the diameter of the upper mold is R, the distance from the axis of the metal consumable electrode to the center of the upper mold is D1, 1/2R>D1≥1/4R; the distance from the axis of the lower mold to the center of the upper mold is D2 , 1/2R>D2≥1/4R.

3. Beneficial effect

Compared with the prior art, the technical solution provided by the invention has the following beneficial effects:

(1) A kind of production method based on electroslag remelting bimetal composite roll of the present invention, in this electroslag remelting device, crystallizer is eccentric type crystallizer, is divided into upper crystallizer and lower crystallizer, the lower crystallizer The diameter is smaller than the diameter of the upper crystallizer, the lower crystallizer is arranged at the lower part of the upper crystallizer, and the axes of the upper crystallizer and the lower crystallizer are not on the same straight line, and the side wall of the lower crystallizer is in line with the opening side of the upper crystallizer The side wall is tangent. While ensuring the uniform coating and firm welding of the roll working surface material on the roll core surface, this arrangement can make the metal consumable electrode not affected by the position and size of the roll core during the smelting process. The thickness of the working surface of the roll can be adjusted arbitrarily, and in addition, it is only necessary in the production process.

(2) A kind of production method based on electroslag remelting bimetal composite roll of the present invention, the periphery of eccentric crystallizer is provided with electromagnetic stirring coil, and the range of setting of electromagnetic stirring coil is from lower crystallizer upper end region to upper mold top, so that The metal consumable electrode is stirred in the slag pool of the upper crystallizer during the remelting process, which promotes the uniform temperature of the slag pool, and at the same time promotes the material of the working surface of the roll to be more uniformly coated on the surface of the roll core.

(3) A kind of production method based on the electroslag remelting bimetallic composite roll of the present invention, the periphery of the eccentric crystallizer is provided with electromagnetic stirring coils, and the setting range of the electromagnetic stirring coils is from the upper end area of the lower crystallizer to the top of the upper crystallizer, and the lower Electromagnetic stirring is used at the upper end of the crystallizer to speed up the flow of molten metal in this area, prevent it, and at the same time refine the grains of the molten pool and improve the solidification quality of the working surface of the roll.

(4) A kind of production method based on electroslag remelting double-metal composite roll of the present invention, in the upper crystallizer, diversion dam is set along the side edge of the opening, and the metal near the metal consumable electrode can be removed by the diversion dam. The liquid diverts to a distance, speeds up the coating of the roll core away from the metal consumable electrode surface, and promotes the roll working surface material to be more uniformly coated on the roll core surface.

(5) A production method based on electroslag remelting bimetal composite rolls of the present invention is provided with a vibrating mechanism outside the upper end of the lower crystallizer to refine the crystal grains of the molten pool through vibrations and strengthen the quality of the working surface of the rolls.

Description of drawings

Fig. 1 is a step diagram of a production method based on electroslag remelting bimetal composite roll of the present invention;

Fig. 2 is the structural representation of a kind of eccentric type production bimetal composite roll electroslag remelting device in the present invention;

Fig. 3 is the plan view of a kind of eccentric type production bimetal composite roll electroslag remelting device among the present invention;

Fig. 4 is a schematic structural diagram of the use process of an electroslag remelting device for eccentric production of bimetallic composite rolls in the present invention;

Fig. 5 is a top view of the use process of an eccentric type electroslag remelting device for producing bimetallic composite rolls in the present invention;

Fig. 6 is a schematic diagram of an enlarged structure of a diversion dam section of an eccentric electroslag remelting device for producing bimetallic composite rolls in the present invention.

Fig. 7 is the structural representation of embodiment 3;

Fig. 8 is the structural representation of embodiment 4;

FIG. 9 is a schematic structural view of Embodiment 5.

Explanation of the labels in the schematic diagram:

110, upper crystallizer; 111, diversion dam; 1112, drainage groove; 111A, upstream surface; 111B, backflow surface; 112, opening side; 113, melting side; 120, lower crystallizer; 121, vibration mechanism ;

200, electromagnetic stirring coil; 210, lower stirring coil;

300. Bottom water tank;

400, transformer;

510, metal consumable electrode; 520, roller core; 530, slag pool; 540, molten pool.

Detailed ways

The following detailed description and example embodiments of the invention may be better understood when taken in conjunction with the accompanying drawings, in which elements and features of the invention are identified by reference numerals.

Example 1

Referring to Fig. 2, Fig. 3, Fig. 4 and Fig. 5, an electroslag remelting device for rapid production of bimetallic composite rolls in this embodiment includes an eccentric mold, a bottom water tank 300 and a metal consumable electrode 510; This eccentric crystallizer comprises upper crystallizer 110 and lower crystallizer 120, and upper crystallizer 110 and lower crystallizer 120 axis centers are not on the same straight line, and lower crystallizer 120 is arranged on the bottom of upper crystallizer 110; Upper crystallizer 110 The bottom of the bottom includes an opening side 112 and a smelting side 113, the bottom of the opening side 112 is connected to the lower crystallizer 120, and the shape of the opening side 112 matches the upper port surface of the lower crystallizer 120; the bottom surface of the upper crystallizer 110 except the opening side 112, other areas are On the smelting side 113, a metal consumable electrode 510 is arranged vertically above the smelting side 113; when in use, a roll core 520 is set along the axis of the lower crystallizer 120, and the roll core 520 is the inner metal material of the metal composite roll.

During the electroslag remelting smelting process, if the distance between the metal consumable electrode 510 and the roll core 520 is too small, the high temperature near the metal consumable electrode 510 will cause the roll core 520 to melt excessively, which will affect the working surface material of the lower roll. The welding of the roll core 520 affects the firmness of the welding of the roll face material and the roll core 520. In order to avoid this situation, the diameter of the roll core 520 is limited in the prior art, so that the thickness of the roll face is limited during the production process. . However, in this embodiment, since the axes of the upper crystallizer 110 and the lower mold 120 are not on the same straight line, the axis of the metal consumable electrode 510 and the axis of the roller core 520 are not on a straight line, and the metal self-consumable electrode 510 is not on a straight line. The consumption electrode 510 does not touch the roller core 520, and the diameter of the upper crystallizer 110 is Φ, and the diameter of the lower crystallizer 120 is Selected in this example The distance from the axis of the metal consumable electrode 510 to the center of the upper crystallizer 110 is D1, 1/2Φ>D1≥1/4Φ, the preferred embodiment is D1=1/4Φ, the axis of the lower crystallizer 120 to the center of the upper mold 110 The distance is D2, 1/2Φ>D2≥1/4Φ, and D2=1/4Φ is preferred in this embodiment. And the side wall of the lower crystallizer 120 is tangent to the side wall of the opening side 112 of the upper crystallizer 110. Through this arrangement, the distance between the metal consumable electrode 510 and the roller core 520 is increased, so that the metal consumable electrode 510 is The smelting process is not affected by the position and size of the roll core 520, the placement of the roll core 520 with different diameters will not touch the metal consumable electrode 510 and affect the melting of the metal consumable electrode 510, so the thickness of the roll working surface It can be adjusted arbitrarily by changing the diameter of the roll core 520. The inner diameter of the lower crystallizer 120 is D, the thickness of the working surface of the production roll is h, and the diameter of the roll core 520 is d, and d=D-2h; this placement method improves the quality of the production roll. During the electroslag remelting process, the temperature at the contact point between the metal consumable electrode 510 and the slag pool 530 is relatively high, and the distance between the metal consumable electrode 510 and the axis line of the roller core 520 is relatively far, which can prevent the slag pool 530 from being opposed to the roller core 520. The excessive melting of the surface affects the welding of the lower roll working surface material and the roll core 520, so that the roll working surface material and the roll core 520 are firmly welded to ensure the quality of the roll.

The eccentric crystallizer periphery of the present embodiment is provided with electromagnetic stirring coil 200, and the frequency of electromagnetic stirring coil 200 is 2-10Hz in the present embodiment, preferred 5Hz of the present embodiment, and the range of action of electromagnetic stirring coil 200 is upper crystallizer 110 Inside the slag pool 530. In the slag pool 530 of the upper crystallizer 110, through the stirring action of the electromagnetic stirring coil 200, the molten metal formed by the remelting of the metal consumable electrode 510 in the slag pool 530 is stirred, so that the molten metal in the slag pool 530 Uniform distribution promotes that the material on the working surface of the roll can be more evenly coated on the surface of the roll core 520 .

In the upper crystallizer 110 of this embodiment, the side of the opening side 112 close to the metal consumable electrode 510 is provided with a diversion dam 111, and the diversion dam 111 is arc-shaped. In this embodiment, the diversion dam The center of the dam 111 is on a straight line between the axis of the metal consumable electrode 510 and the axis of the lower crystallizer 120, the arc length of the diversion dam 111 is 1/4 of the circumference where it is located, and the height of the diversion dam 111 is the lower crystallizer 1/4 of the inner diameter of the device 120.

The metal consumable electrode 510 remelts the molten metal in the slag pool 530 and spreads downward toward the roller core 520 in the crystallizer 120. The diversion function of the flow barrier dam 111, a part of the molten metal flows along the arc direction of the diversion barrier dam 111 to both sides of the diversion barrier dam 111, so that the molten metal flows further away, and the roll core 520 is accelerated away from the metal consumable electrode 510 The coating of the working layer of the face roll promotes the material of the working face of the roll to be more uniformly coated on the surface of the roll core 520 .

The upper end of the lower crystallizer 120 of the present embodiment is provided with a vibrating mechanism 121 outside. The scope of action of the vibrating mechanism 121 is the molten pool 540 position. After the pool 540 is solidified, the internal crystals begin to nucleate and grow up. The vibrating mechanism 121 knocks and vibrates, and the vibration wave is introduced into the molten pool 540. Part of the growing crystal tissue is broken after being vibrated to produce more nucleation cores. Form a crystal structure with better performance.

The bottom water tank 300 of this embodiment is arranged below the lower crystallizer 120, and is connected with the roller core 520. In this embodiment, the material of the bottom water tank 300 is copper, and the roller core 520 moves downward, and the bottom water tank 300 is connected with the metal consumable electrode 510. To the power supply, the power supply in this embodiment is an AC power supply, which is transformed by the transformer 400, and the bottom water tank 300 and the metal self-consumable electrode 510 form an electric circuit.

Example 2

As shown in Figure 6, this embodiment is basically the same as Embodiment 1, the difference is that in this embodiment, the angle between the upstream surface 111A of the diversion dam 111 and the bottom end surface is α=45°, and the reverse flow surface of the diversion dam 111 is The angle between 111B and the bottom surface is β=70°, and the height of diversion dam 111 is 1/4 of the distance from the bottom surface of upper crystallizer 110 to the bottom surface of metal consumable electrode 510. When the molten metal hits diversion dam 111, A part of the molten metal that has not been drained directly crosses the top of the diversion dam 111, and the top of the diversion dam 111 in the cross-sectional direction is arc-shaped, and the molten metal is easier to cross the top of the diversion dam 111; The angle α between the bottom end surface is smaller than the angle β between the backflow surface 111B and the bottom end surface of the diversion dam 111. When the molten metal flows in the direction of the upstream surface 111A, it is easier to pass due to the small slope. If the molten metal flows in the direction of the backflow surface 111B When flowing, due to the large slope, the resistance is relatively large, and it is difficult to flow through. Therefore, this setting can prevent the backflow of molten metal to a certain extent, so that the molten metal can gather as much as possible on the opening side 112 of the upper crystallizer 110, and promote the rolling of the rolls. The even distribution of molten metal on the opening side 112 of the working surface improves the coating speed of molten metal and improves the production efficiency of rolls.

Example 3

As shown in Figure 7, this embodiment is basically the same as Embodiment 1, the difference lies in: a kind of electroslag remelting device for rapid production of bimetallic composite rolls in this embodiment, a lower stirring coil 210 is arranged below the electromagnetic stirring coil 200 The lower stirring coil 210 is also a coil used for electromagnetic stirring. The stirring action range of the lower stirring coil 210 includes the molten pool 540 and the surrounding area above the molten pool 540. The temperature in the adjacent area above the molten pool 540 is relatively low, and the temperature of the molten metal in this area is difficult to control. , it is easy to solidify and cause the interruption of the smelting process. After the stirring action of the lower stirring coil 210, the interactive flow of the molten metal in this area and the molten metal with a higher temperature above is promoted, and the temperature drop in this area is alleviated; under the stirring action of the lower stirring coil 210, the melting The flow in the pool 540 breaks the columnar crystals being produced to generate more nucleation cores, thereby promoting the conversion of columnar crystals to equiaxed crystals. Improve the quality of the roll face.

Example 4

As shown in FIG. 8 , this embodiment is basically the same as Embodiment 1, except that in this embodiment, the upstream surface 111A of the diversion dam 111 is arranged toward the flow direction of the molten metal. Under the action of the electromagnetic stirring coil 200, the molten metal in the slag pool 530 moves centripetally in a spiral shape, rotates and stirs, and after the molten metal hits the upstream surface 111A of the diversion dam 111, part of the molten metal crystallizes upward due to the diversion effect The movement of the edge of the device 110 increases the probability of the molten metal moving to the opening side 112, and promotes the accumulation and uniformity of the molten metal at the opening side 112.

Example 5

Referring to Fig. 9, this embodiment is basically the same as Embodiment 1, the difference is that in this embodiment, an electroslag remelting device for rapid production of bimetallic composite rolls, the diversion dam 111 is provided with a drainage groove 1112, and this embodiment The height of the bottom of the middle drainage groove 1112 is 1/2 of that of the diversion dam 111 . Part of the molten metal diverted to both sides of the diversion dam 111 by the diversion dam 111 can be directly diverted into the opening side 112 through the diversion groove 1112 to promote the accumulation and uniformity of the molten metal at the opening side 112 .

In the method for producing bimetallic composite rolls using the above-mentioned electroslag remelting device of the present invention, the roll core 520 is inserted into the lower crystallizer 120, the roll core 520 is used as the inner layer metal of the composite roll, and the metal consumable electrode 510 is The bottom is inserted into the upper crystallizer 110, and the metal consumable electrode 510 is melted and welded to the surface welded to the roll core 520 to obtain a bimetal composite roll.

The specific implementation steps of embodiment 1, 2 and 3 are:

Step 1. Equipment installation

The metal consumable electrode 510 is arranged above the smelting side 113 of the upper crystallizer 110, the roller core 520 is placed in the lower crystallizer 120, the bottom water tank 300 supports the roller core 520 at the bottom of the lower crystallizer 120, and the bottom water tank 300 and the metal consumable power The poles 510 are electrically connected to form an electrical circuit;

Step 2. Electroslag remelting

After melting the heavy slag, pour it into the eccentric mold to form a slag pool 530, insert one end of the metal consumable electrode 510 into the slag pool 530, and the metal consumable electrode 510 is melted to form molten metal evenly distributed in the upper mold 110 In the slag pool 530 above the opening side 112, evenly fall into the molten pool 540;

Step 3. Roll welding and solidification

The molten metal in the molten pool 540 is cooled and solidified, welded to the surface of the roll core 520, and the bottom water tank 300 is continuously pulled to draw ingots to obtain finished rolls.

The present invention has been described in detail above with reference to specific exemplary embodiments. However, it should be understood that various modifications and changes can be made without departing from the scope of the present invention as defined in the appended claims. The detailed description and drawings are to be regarded as illustrative only and not restrictive, and any such modifications and variations, if any, are intended to fall within the scope of the invention as described herein. In addition, the background art is intended to illustrate the research and development status and significance of the present technology, and is not intended to limit the present invention or the application and the application field of the present invention.

The present invention has been described in detail above with reference to specific exemplary embodiments. However, it should be understood that various modifications and changes can be made without departing from the scope of the present invention as defined in the appended claims. The detailed description and drawings are to be regarded as illustrative only and not restrictive, and any such modifications and variations, if any, are intended to fall within the scope of the invention as described herein. In addition, the background art is intended to illustrate the research and development status and significance of the present technology, and is not intended to limit the present invention or the application and the application field of the present invention.

Claims (9)

1. a kind of production method based on electroslag remelting bimetallic composite roll, it is characterised in that：The step of the method is：

Step 1: placing inner layer metal

Metal consumable electrode (510) is set to above upper crystallizer (110) melting side (113), roller core (520) placement is placed in down Inner layer metal in crystallizer (120) as composite roll, bottom water case (300) is in lower crystallizer (120) bottom supported roller core (520)；

Step 2: electroslag remelting

Slag bath (530) is formed in eccentric crystallizer by being poured into after remelting slag fusing, and one end of metal consumable electrode (510) is inserted Enter in slag bath (530), metal consumable electrode (510) is electrically connected to form electrical circuit with bottom water case (300)；Metal consumable electrode (510) it melts, enter molten bath (540) after refining；

Step 3: outer layer metal solidifies soldering

Molten metal cooled and solidified in molten bath (540) and the surface for being welded in roller core (520) form the inner layer metal of composite roll, Obtain bimetallic composite roll.

2. a kind of production method based on electroslag remelting bimetallic composite roll according to claim 1, it is characterised in that： The centering type crystallizer includes upper crystallizer (110) and lower crystallizer (120), and the diameter of lower crystallizer (120) is less than upper The diameter of crystallizer (110), lower crystallizer (120) are set to the lower part of crystallizer (110), and upper crystallizer (110) and under Crystallizer (120) axle center is not arranged on the same straight line.

3. according to a kind of production method based on electroslag remelting bimetallic composite roll described in claim 1, it is characterised in that：Under The internal diameter of crystallizer (120) is D, and production rolling face thickness is h, a diameter of d, d=D-2h of roller core (520).

4. a kind of production method based on electroslag remelting bimetallic composite roll according to claim 1, it is characterised in that： It is provided with electromagnetic stirrer coil (200) on the outside of upper crystallizer (110), which is used for upper crystallizer (110) molten metal in is stirred.

5. a kind of production method based on electroslag remelting bimetallic composite roll according to claim 1, it is characterised in that： Metal consumable electrode (510) is molten into after molten metal enters slag bath (530) and is distributed in out by water conservancy diversion dam (111) guide functions Above mouth side (112) in slag bath (530).

6. a kind of production method based on electroslag remelting bimetallic composite roll according to claim 1, it is characterised in that： The upper end of the lower crystallizer (120) is equipped with vibrating mechanism (121), which is used for during vibration clotting Molten metal.

7. a kind of production method based on electroslag remelting bimetallic composite roll according to claim 1, it is characterised in that： A diameter of R of upper crystallizer (110), a diameter of r, R >=2r of lower crystallizer (120).

8. a kind of production method based on electroslag remelting bimetallic composite roll according to claim 7, it is characterised in that： Water conservancy diversion dam (111) fluoran stream surface (111A) and -45 ° of bottom face angle α=30 °, water conservancy diversion dam (111) lee side (111B) and bottom - 80 ° of end face angle β=60 °.

9. according to a kind of production method based on electroslag remelting bimetallic composite roll of claim 1-8 any one of them, It is characterized in that：A diameter of R of upper crystallizer (110), metal consumable electrode (510) axle center to upper crystallizer (110) circle center distance For D1,1/2R ＞ D1 >=1/4R；Lower crystallizer (120) axle center to upper crystallizer (110) circle center distance be D2, D2 >=1/ 1/2R ＞ 4R。