CN220880452U - Dabber supporting base for reconstructed steel ingot - Google Patents

Abstract

The utility model relates to a mandrel supporting base for a reconstructed steel ingot, and belongs to the technical field of molten steel ingot casting. The support base comprises a transverse plate, a thin plate and a plurality of vertical plates, wherein the transverse plate is arranged in parallel with the thin plate, the transverse plate is positioned above the thin plate, the transverse plate and the thin plate are fixedly connected to the vertical plates respectively, and the vertical plates are uniformly distributed along the peripheral surface of the transverse plate. Under the action of the mandrel supporting base, the mandrel in the reconstructed steel ingot and the external melt are metallurgically and mechanically combined, no cracking is generated in the forging process, and the defects of element segregation, loose shrinkage cavity, nonmetallic inclusion aggregation and the like in the steel ingot are relieved.

Description

Dabber supporting base for reconstructed steel ingot

Technical Field

The utility model relates to the technical field of molten steel ingot casting, in particular to a mandrel supporting base for a reconstructed steel ingot.

Background

The forge piece is the basis for developing industries such as electric power, ships, metallurgy, machinery and the like, and is a precondition of advanced equipment manufacturing industry. In general, the forging is formed by freely forging steel ingots, and along with the continuous progress of industry, the forging is continuously developed towards the large-size direction, and the specification of the steel ingots for the forging is gradually increased.

However, as the specification of the steel ingot becomes larger, defects such as element segregation, loose shrinkage cavity, nonmetallic inclusion aggregation and the like in the steel ingot are more prominent, and the defects are mainly concentrated in the core part of the steel ingot, so that the qualification rate of the forging is greatly reduced, the waste of materials, energy sources and the like is caused, and the production cost is increased.

In order to alleviate the defects of element segregation, loose shrinkage cavity, nonmetallic inclusion aggregation and the like in the steel ingot, a prefabricated mandrel is mainly adopted at present, and then a high-temperature external melt is used for wrapping the mandrel to prepare the reconstructed steel ingot. However, the problem of cracking caused by incomplete solid-liquid fusion or severe interface oxidation in the forging process of the obtained reconstructed steel ingot causes the rejection of the reconstructed steel ingot and wastes resources.

Therefore, a preparation method is needed to ensure that the mandrel in the reconstructed steel ingot and the outer melt are metallurgically bonded, and cracking is not generated in the forging process.

Disclosure of utility model

In view of the above analysis, the present utility model aims to provide a mandrel support base for a reconstructed ingot, so that the mandrel in the reconstructed ingot and an external melt are metallurgically bonded, and no cracking is generated in the forging process.

In one aspect, the utility model provides a mandrel support base for a reconstructed steel ingot, which comprises a transverse plate, a thin plate and a plurality of vertical plates, wherein the transverse plate is arranged in parallel with the thin plate, the transverse plate is positioned above the thin plate, the transverse plate and the thin plate are fixedly connected to the vertical plates respectively, and the vertical plates are uniformly distributed along the peripheral surface of the transverse plate.

Further, the support base is integrally formed.

Further, the support base connects the standing plate, the transverse plate and the thin plate by welding.

Further, the transverse plate is a disc, a first through hole is formed in the center of the transverse plate, and a plurality of second through holes are uniformly formed around the first through hole.

Further, the cross plate is composed of a plurality of identical sector blocks concentric, the number of sector blocks being equal to the number of the vertical plates.

Further, the fan-shaped block is composed of a first block, a second block and a third block which are sequentially connected from the center of a circle along the radial direction, the second block is located between the first block and the third block, the thicknesses of the first block and the third block are equal, and the thickness of the second block is larger than that of the first block or the third block.

Further, a second through hole is formed in the second block.

Further, the vertical plate is rectangular, a plurality of third through holes are formed in the vertical plate, a positioning block is fixedly connected to the upper end of the vertical plate, the positioning block has a certain inclination angle, and the inclination angle is matched with the lower end of the mandrel.

Further, the side wall of the vertical plate is of a wavy structure, and an upper groove and a lower groove are formed in the upper end and the lower end of the vertical plate.

Further, the thicknesses of the vertical plate and the transverse plate are 20-80mm; the thickness of the thin plate is 3-8mm.

Compared with the prior art, the utility model has at least one of the following beneficial effects:

1. The support base comprises a transverse plate, a thin plate and a plurality of vertical plates, wherein the transverse plate and the thin plate are arranged in parallel, the transverse plate and the thin plate are fixedly connected to the vertical plates respectively, and the vertical plates are uniformly distributed along the peripheral surface of the transverse plate. On the one hand, the support base plays a supporting role on the mandrel, on the other hand, through the structural design of the support base, the solid-liquid fusion effect and the interface bonding strength are improved, tearing along the bonding interface in the forging process is prevented, oxidation is reduced when the support base contacts with air at high temperature, a large amount of oxide inclusions are wrapped in the forging, the quality of the forging is reduced, and even the forging is directly caused to be scrapped.

2. According to the utility model, the wavy structure and the upper and lower grooves are arranged on the vertical plate, so that the contact area of the external melt and the vertical plate is increased, and the bonding strength of the external melt and the supporting base is further increased. The material of the support base and the mandrel can be homogenous.

In the utility model, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the utility model, like reference numerals being used to refer to like parts throughout the several views.

FIG. 1 is a schematic view of a support base;

FIG. 2 is a schematic view of a circular cross plate;

FIG. 3 is a schematic view of a sector diaphragm;

FIG. 4 is a schematic view of a modular sector diaphragm;

FIG. 5 is a schematic view of a riser;

FIG. 6 is a schematic view of a riser with a card slot;

FIG. 7 is a schematic view of a fan-shaped thin block;

FIG. 8 is a schematic diagram of a metallurgical auxiliary assembly;

FIG. 9 is a schematic illustration of a mandrel;

FIG. 10 is a schematic view of a steel flow collection sleeve through-shaft cross-section;

FIG. 11 is a schematic diagram of a mandrel suspension hoisting scheme of comparative application example 2;

In the figure, 1, a pouring chassis; 2. ingot mould; 3. insulating riser; 4. a support base; 41. a cross plate; 42. a vertical plate; 43. a thin plate; 44. a positioning block; 45. an upper groove; 46. a lower groove; 47. a clamping groove; 5. a mandrel; 6. a steel flow collection sleeve; 7. a first through hole; 71. a second through hole; 72. a third through hole; 73. a fourth through hole; 81. a first block; 82. a second block; 83. and a third block.

Detailed Description

The following detailed description of preferred embodiments of the utility model is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the utility model, are used to explain the principles of the utility model and are not intended to limit the scope of the utility model.

With the development of industry, the forging and the steel ingot for the forging also show great normalization. The defects of segregation, loose shrinkage cavity, non-metallic inclusion aggregation and the like of the internal elements of the steel ingot with larger weight are more prominent, and particularly the core of the steel ingot.

In order to improve the defects of the core part of the steel ingot, the research direction of reconstructing the steel ingot is proposed, and then the prefabricated core shaft is firstly prefabricated, and then the prefabricated core shaft is wrapped by using a high-temperature external melt. Placing a pouring chassis on the horizontal ground, placing a supporting base in the center of the pouring chassis, placing a mandrel on the supporting base, and placing an ingot mould on the pouring chassis; and pouring the outer melt into the ingot mould, and cooling to obtain the reconstructed steel ingot.

However, when the existing support base is used for preparing the reconstructed steel ingot, the obtained reconstructed steel ingot is cracked in the forging process, the existing support base is a hollow cylinder, and a plurality of grooves are formed in the upper opening and the lower opening of the chaplet.

Therefore, the utility model provides a mandrel support base for a reconstructed steel ingot, which comprises a transverse plate, a thin plate and a plurality of vertical plates, wherein the transverse plate is arranged in parallel with the thin plate, the transverse plate is positioned above the thin plate, the transverse plate and the thin plate are fixedly connected to the vertical plates respectively, and the vertical plates are uniformly distributed along the peripheral surface of the transverse plate.

Compared with the prior art, the utility model adopts the supporting base to support the mandrel, so that the defects of element segregation, loose shrinkage cavity, nonmetallic inclusion aggregation and the like in the steel ingot can be effectively improved; and through the structural design to supporting the base, improve solid-liquid fusion effect and interface bonding strength for dabber and outer fuse-element reach metallurgical bonding and mechanical bond, prevent to tear along the interface in the forging process, and reduce a large amount of oxide inclusion parcel in the forging, guaranteed the quality and the forging formability of reconfiguration steel ingot.

Referring to fig. 1, the present utility model provides the support base 4, which includes a transverse plate 41, a thin plate 43 and a plurality of vertical plates 42, wherein the transverse plate 41 is disposed parallel to the thin plate 43, the transverse plate 41 is located above the thin plate 43, the transverse plate 41 and the thin plate 43 are fixedly connected to the vertical plates 42, and the plurality of vertical plates 42 are uniformly distributed along the outer peripheral surface of the transverse plate 41.

Specifically, the support base 4 is integrally formed.

The support base 4 can be integrally formed through machining, is high in overall strength, can well support the mandrel 5, and bears large weight.

Specifically, the support base 4 connects the standing plate 42, the transverse plate 41, and the thin plate 43 by welding.

The vertical plate 42, the transverse plate 41 and the thin plate 43 are manufactured independently, and then are connected by adopting a welding process, so that the operation is convenient, and the processing period is short.

Referring to fig. 2, in one possible design, the cross plate 41 is a disc, and a first through hole 7 is formed at the center, and a plurality of second through holes 71 are uniformly formed around the first through hole 7.

Referring to fig. 3, in one possible design, the cross plate 41 is composed of a plurality of identical sector-shaped blocks concentric with each other, the number of sector-shaped blocks being equal to the number of the risers 42, the sector-shaped blocks being provided with second through holes 71.

In the manufacturing process, the sector blocks are manufactured separately and then fixedly connected to the side wall between the two vertical plates 42 by a welding technology, and the sector blocks are positioned at the same horizontal position.

Referring to fig. 4, it is preferable that the fan-shaped block is composed of a first block 81, a second block 82 and a third block 83 which are sequentially connected in a radial direction from a center, the second block 82 is located between the first block 81 and the third block 83, and the thicknesses of the first block 81 and the third block 83 are equal, and the thickness of the second block 82 is greater than that of the first block 81 or the third block 83.

When the transverse plate 41 is a disc, machining is convenient, and meanwhile, an elongated slot for inserting the transverse plate 41 is also required to be formed at the corresponding position of the vertical plate 42. When the cross plate 41 is divided into a plurality of sector blocks, the sector blocks are composed of the first block 81, the second block 82, and the third block 83, and the three blocks are different in thickness. The thickness of the first block 81 and the third block 83 is thinner, so that the later external melt can be conveniently melted on the supporting base 4, while the thickness of the second block 82 is thicker, and the external melt can only be melted partially, so that the external melt and the supporting base 4 can be finally mechanically and metallurgically combined.

In the manufacturing process, the fan-shaped block can be used for connecting the first block 81, the second block 82 and the third block 83 through welding, and can also be integrally formed; it is then affixed to the side wall between the two risers 42 by welding techniques and the plurality of sector blocks are in the same horizontal position.

Preferably, the second block 82 is provided with a second through hole 71.

Preferably, a triangular elongated body is fixedly connected to the third block 83, and the elongated body is located on a side of the third block 83 away from the second block 82.

The outer melt wraps the supporting base 4 and partially melts the transverse plate 41 and the vertical plate 42, so that the outer melt is metallurgically bonded with the transverse plate 41 and the vertical plate 42. A triangular elongated body is provided on the third block 83, and has a thickness equal to or slightly smaller than that of the third block 83, to promote fusion of the cross plate 41, the riser 42 and the outer melt.

Referring to fig. 5, specifically, the vertical plate 42 is rectangular, a plurality of third through holes 72 are formed in the vertical plate 42, a positioning block 44 is fixedly connected to the upper end of the vertical plate 42, the positioning block 44 has a certain inclination angle, the inclination angle is matched with the lower end of the mandrel 5, and the inclined surface of the positioning block 44 and the plane at the bottom of the inclined surface are matched with the lower end of the mandrel 5, so that the positioning and supporting of the mandrel 5 by the supporting base 4 are realized.

The support base 4 positions and supports the mandrel 5, so that the coaxiality of the mandrel 5 and the outer melt is ensured, and the mandrel 5 is prevented from being greatly deviated when the outer melt is poured. While the riser 42 mainly carries the overall weight of the mandrel 5, serving a main supporting function.

After casting the outer melt, the outer melt is gradually filled upwards from the bottom of the support base 4 until the support base 4 is submerged, and the outer melt is continuously cast and gradually submerged in the mandrel 5. The high-temperature outer melt is in contact with the vertical plate 42 and melts the surfaces of the vertical plate 42 and the transverse plate 41, so that the outer melt supporting base 4 is metallurgically bonded; in addition, the outer melt enters the cavity of the support base 4 consisting of the vertical plate 42, the transverse plate 41 and the thin plate 43, and the outer melt enters the third through hole 72 on the vertical plate 42, and after cooling, the outer melt and the support base 4 are mechanically combined. During forging, the separation of the outer melt and the mandrel 5 is effectively reduced, thereby ensuring the forging quality.

Preferably, the side wall of the vertical plate 42 has a wave-shaped structure, and an upper groove 45 and a lower groove 46 are formed at the upper and lower ends of the vertical plate 42.

The wavy structure, the upper groove 45 and the lower groove 46 are arranged on the vertical plate 42, so that the contact and combination area of the outer melt and the vertical plate 42 is increased, the mechanical combination strength of the outer melt and the supporting base 4 is further increased, and the supporting base 4 and the mandrel 5 are wrapped by the outer melt. In the forging process, when the bonding strength of the support base 4 and the outer melt is low, cracks are generated between the support base 4 and the outer melt, the cracks gradually expand from the support base 4 to the direction of the mandrel 5, and finally separation occurs between the mandrel 5 and the outer melt after forging.

Referring to fig. 6, preferably, a slot 47 is formed in the vertical plate 42 on the plane located at the bottom of the inclined surface of the positioning block 44, and extends to one side of the wavy structure, and the slot 47 is used for inserting the transverse plate 41.

When the transverse plate 41 adopts the circular structure with an integral structure (as shown in fig. 2), the vertical plate 42 needs to be provided with the clamping grooves 47 for inserting the transverse plate 41, the vertical plate 42 is inserted into the transverse plate 41 in sequence along the circumferential direction of the transverse plate 41, and the vertical plates 42 are uniformly distributed.

Referring to fig. 7, specifically, the thin plate 43 is composed of a plurality of concentric identical sector-shaped thin blocks, the number of which is equal to the number of the vertical plates 42, and fourth through holes 73 are formed in the sector-shaped thin blocks.

In the manufacturing process, the fan-shaped thin blocks are manufactured separately and then fixedly connected to the side wall between the two vertical plates 42 by a welding technology, and the fan-shaped thin blocks are positioned at the same horizontal position and below the transverse plates 41.

Specifically, the thickness of the vertical plate 42 and the transverse plate 41 is 20-80mm; the thickness of the sheet 43 is 3-8mm.

The thickness of the vertical plate 42 and the transverse plate 41 is 20-80mm, when the thickness is lower than 20mm, the heat of the external melt is too large, so that the risk of instability of the structure of the support base 4 is increased, and the axial deviation of the mandrel 5 or casting failure is affected; when the thickness is larger than 80mm, the bottom cooling effect is increased, so that the fluidity of molten steel at the bottom of the steel ingot is poor, and the defects of loosening, shrinkage cavity and the like are easily formed. In addition, the thickness of the sheet 43 is 3-8mm.

The transverse plate 41 and the vertical plate 42 are main supporting structures of the base, can support the mandrel 5, and can ensure that closed forging is formed in the subsequent forging process without generating larger cracking. The role of the sheet 43 is mainly to strengthen the fusion of the mandrel 5 and the outer melt, improving the metallurgical bonding effect.

Referring to fig. 8 and 9, the pouring chassis 1 is placed on the horizontal ground, the pouring chassis 1 is a cylinder, a groove is formed in the center of the pouring chassis 1, and the cross-section of the groove through shaft is in an inverted trapezoid shape;

Then the supporting base 4 is placed in the groove, and the mandrel 5 is placed on the vertical plate 42 of the supporting base 4; finally, placing an ingot mould 2 on the pouring chassis 1, placing a heat-preserving riser 3 on the ingot mould 2, completing the assembly of the metallurgical auxiliary tool, pouring the external melt into the ingot mould 2, and cooling to obtain the reconstructed steel ingot.

Specifically, the pouring mode of the outer melt adopts upper pouring or lower pouring.

The upper injection of the utility model refers to: molten steel is directly poured into the ingot mould 2 from above. The betting means: molten steel enters the ingot mould 2 from the lower part through the middle pouring pipe and the pouring channel. The up and down pouring is a pouring method commonly used in the art, and is not described herein in detail, nor is the pouring channel shown in the drawings.

When the upper pouring mode is adopted, the pouring speed is 3-8t/min, when the pouring speed is lower than 3t/min, the pouring speed is too low, the temperature gradient of molten steel (referred to as external melt) is increased, the distribution of the final temperature field of the reconstructed steel ingot is influenced, and the internal stress is increased to cause the generation of defects such as cracks and the like; in addition, the fluidity of the molten steel is poor, which is not beneficial to the floating of inclusions and the fusion of the molten steel and the supporting base 4; when the casting speed is higher than 8t/min, the casting speed is too high, the degassing effect of liquid drops is poor, the impact of molten steel on auxiliary tools is large, the liquid level is unstable, the floating of inclusions is also not facilitated, and defects such as loose shrinkage cavity, nonmetallic inclusion aggregation and the like are easily generated in the reconstructed steel ingot.

Specifically, when the casting mode of the outer melt adopts upper casting, the casting vacuum degree is below 67 Pa. When the outer melt is poured, the gas content needs to be controlled to be lower, so that the defects of shrinkage porosity, shrinkage cavity and the like are prevented in the cooling stage. When the vacuum degree is lower than 67Pa, the hydrogen in the steel is reduced to below 1ppm, and the risks of white spots and hydrogen induced cracks of the forging are greatly reduced.

Specifically, when the pouring mode of the outer melt adopts upward pouring, the metallurgical auxiliary tool assembly further comprises a steel flow collecting sleeve 6 placed on the mandrel 5, and the steel flow collecting sleeve 6 is positioned on one side of the mandrel 5 away from the supporting base 4.

When the utility model adopts the upper pouring to pour the outer melt, the steel flow collecting sleeve 6 is added on the mandrel 5, so that the high-temperature outer melt can be effectively restrained, and the quality problems of scab on the surface of the reconstructed steel ingot and the like caused by splashing of the outer melt are prevented.

Referring to fig. 10, specifically, the steel flow collecting sleeve 6 is cylindrical or may be truncated cone-shaped. A plurality of circular overflow holes are formed in the middle of the steel flow collecting sleeve 6, so that the outer melt can conveniently flow into the ingot mould 2 from the steel flow collecting sleeve 6. And a plurality of lifting lugs are estimated at the upper part of the outer peripheral surface of the steel flow collecting sleeve 6, so that the lifting is convenient.

In particular, the steel flow collecting sleeve 6 may be a welded part or an integrally formed part.

Specifically, one end of the steel flow collecting sleeve 6 is assembled with the mandrel 5, and the inner diameter of the steel flow collecting sleeve 6 is the same as the outer diameter of the mandrel 5.

When a pouring-down pouring mode is adopted, the pouring speed is 2-5t/min, when the pouring speed is lower than 2t/min, the pouring speed is too low, part of molten steel is condensed into a pouring channel, so that the temperature of the molten steel entering the ingot mould 2 is too low, the metallurgical combination of the molten steel and the supporting base 4 cannot be realized, further cracks are generated in the forging process, and current interruption possibly occurs when the casting speed is more serious, and the pouring failure is caused; when the pouring speed is higher than 5t/min, the scouring of molten steel to a refractory pouring channel is aggravated when the pouring speed is too high, so that the purity of the molten steel is reduced, and meanwhile, the liquid level is not stable to rise, so that the surface quality of the steel ingot is affected.

Smelting of the outer melt: the refining tapping temperature is controlled between 1580 ℃ and 1590 ℃; when the vacuum degree of the vacuum chamber is lower than 67Pa, preparing to start pouring after measuring the temperature of the molten steel of the tundish at 1550-1560 ℃; the casting speed of the external melt is 2-8t/min; and cooling to obtain the reconstructed steel ingot.

Specifically, the materials of the mandrel 5 and the outer melt are homogeneous or heterogeneous.

The mandrel 5 and the outer melt form a reconstructed steel ingot, and the materials of the mandrel 5 and the outer melt are the same or different. When the materials of the mandrel 5 and the outer melt are different, the reconstructed steel ingot can be used for preparing forgings such as supporting rollers, pipelines and the like. The support rolls and the pipes are characterized in that the working parts are mainly on the surface, namely at the outer melt in the reconstructed ingot. Therefore, the mandrel 5 can be made of materials with low price and poor performance while ensuring the performance of the reconstructed steel ingot, and the production cost is greatly reduced.

The reconstructed steel ingot comprises a mandrel 5, wherein the mandrel 5 accounts for 20% -50% of the weight of the steel ingot, and the cross section accounts for 30% -60%.

According to the actual production requirement, the ratio of the mandrel 5 can be selected, and when the mandrel 5 accounts for less than 20% of the weight of the steel ingot, the defects of element segregation, loose shrinkage cavity, nonmetallic inclusion aggregation and the like in the steel ingot cannot be effectively overcome; when the mandrel 5 accounts for more than 50% of the weight of the steel ingot, the outer melt cannot melt the surface of the mandrel 5, and the mandrel and the outer melt cannot be metallurgically bonded. While the cross-sectional ratio is related to the function and shape of the forging, taking into account that the outer melt provides sufficient heat to create a corresponding metallurgical bond.

In order to more clearly describe the present utility model, it is further illustrated by the following examples and comparative examples.

Example 1

The support base comprises a transverse plate, a thin plate and a plurality of vertical plates. The transverse plates and the thin plates are arranged in parallel, the distance between the transverse plates and the thin plates is 220mm, the transverse plates are positioned above the thin plates, the transverse plates and the thin plates are fixedly connected to the vertical plates respectively, and the vertical plates are uniformly distributed along the peripheral surfaces of the transverse plates;

The vertical plate is rectangular with the thickness of 60mm, a plurality of square third through holes are formed in the vertical plate, the side length of each square third through hole is 50mm, a positioning block is fixedly connected to the upper end of the vertical plate, the positioning block has a certain inclination angle, and the inclination angle is matched with the lower end of the mandrel. The side wall of the vertical plate is of a wavy structure, and an upper groove and a lower groove are formed in the upper end and the lower end of the vertical plate.

The cross plate is composed of a plurality of identical sector blocks, the thickness of the cross plate is 40mm, second through holes are formed in the sector blocks, the diameter of each second through hole is 100mm, and the number of the sector blocks is equal to that of the vertical plates.

The thin plate consists of a plurality of identical fan-shaped thin blocks, and the thickness of the thin plate is 5mm; and a fourth through hole is formed in the fan-shaped thin block, the diameter of the fourth through hole is 150mm, and the number of the fan-shaped thin blocks is equal to the number of the vertical plates.

Comparative example 1

The chaplet is a hollow cylinder, and a plurality of grooves are formed in the upper opening and the lower opening of the chaplet.

Application example 1

The reconstructed steel ingot of the application example is used for preparing a supporting roll forging piece, the weight of the reconstructed steel ingot is 38.5t, the weight of the required reconstructed steel ingot is 62t, and the weight of the mandrel is 17t.

The reconstructed steel ingot comprises a mandrel and an outer melt, wherein the materials of the mandrel and the outer melt are 45Cr4NiMoV.

S1: assembling a metallurgical auxiliary tool:

Placing a pouring chassis on the horizontal ground, wherein the pouring chassis is cylindrical, a groove is formed in the center of the pouring chassis, and the cross section of a through shaft of the groove is in an inverted trapezoid shape; then placing the support base of embodiment 1 in the groove, wherein the support base is 200mm higher than the groove; then, a mandrel is placed on a vertical plate of a supporting base, and the lower end of the mandrel is matched with the upper end of the supporting base; and (3) arranging a steel flow collecting sleeve on the mandrel, wherein the upper end of the mandrel is matched with the lower end of the steel flow collecting sleeve, finally, placing a steel ingot mould on the pouring chassis, and then placing a heat-preserving riser on the steel ingot mould, thereby completing the assembly of the metallurgical auxiliary tool.

S2: and (3) casting an outer melt:

Smelting of the outer melt: the refining tapping temperature is controlled between 1580 ℃ and 1590 ℃; when the vacuum degree of the vacuum chamber is lower than 67Pa, preparing to start pouring after measuring the temperature of the molten steel of the tundish at 1550-1560 ℃; and (5) pouring upwards, wherein the pouring speed is 5.5t/min, and cooling to obtain the reconstructed steel ingot.

Application example 2 (homogeneous + betting)

Application example 2 was substantially identical to application example 1 in that application example 2 was cast using a downcast, the casting speed was 2.5t/min, and no steel flow collection sleeve was included.

Application example 3 (heterogeneous + Top-filling)

The preparation process of application example 3 is substantially the same as that of application example 1, except that the materials of the mandrel and the outer melt of application example 3 are heterogeneous, the material of the mandrel is 42CrMo, and the material of the outer melt is 45Cr4NiMoV.

Application example 4 (heterogeneous + betting)

The preparation process of application example 4 is substantially the same as that of application example 2, except that the materials of the mandrel and the outer melt of application example 4 are heterogeneous, the material of the mandrel is 42CrMo, and the material of the outer melt is 45Cr4NiMoV.

Comparative application example 1

The support base of comparative application example 1 was a chaplet as provided in comparative example 1.

Comparative application example 2

In comparative application example 2, the mandrel was suspended and lifted, and no support base was used (see fig. 11).

Performance detection

The reconstructed steel ingots obtained in the above application examples 1 to 4 and comparative application examples 1 to 2 were forged, and the forging was performed four times, the first fire: lightly upsetting the ingot bottom upwards; second fire: the ingot body is stretched out in a full length way, and a water gap is pressed into a jaw; third fire: upsetting, KD, wherein the KD rolling reduction is 20% of the height of the blank; fourth fire: and drawing and discharging to obtain a finished product. And (3) observing whether the obtained reconstructed steel ingot has cracks, namely the interface closing degree, forging, annealing, testing the mechanical properties of the combined interface, and taking the position of the joint of the outer melt and the mandrel, which is 100mm upwards, at the lowest position of the mandrel. The test results are shown in Table 1.

TABLE 1 detection results

Group of	Degree of interfacial closure	Tensile Strength:/MPa	Yield strength in MPa
				Example 1	No crack	598	261
Example 2	No crack	588	257
				Example 3	No crack	594	273
Example 4	No crack	583	259
				Comparative example 1	Cracking of	-	-
Comparative example 2	No crack	578	259

* In Table 1, "-" indicates that no detection was performed

As can be seen from the combination of application examples 1 to 4 and comparative application examples 1 to 2 and the combination of table 1, in application examples 1 to 4 of the present utility model, the casting speed and the casting mode are controlled under the support of the support base, and the obtained reconstructed steel ingot has no crack during forging, high bonding strength and high coaxiality.

When the conventional chaplet is adopted in comparative application example 1, the obtained reconstructed steel ingot is severely cracked in the forging process, and the reconstructed steel ingot is scrapped.

Referring to fig. 11, comparative application example 2a mandrel was placed in an ingot mold by hanging in the air without any support below the mandrel. When the outer melt is poured, the outer melt extrudes the mandrel, so that the mandrel is deviated, and the coaxiality of the outer melt and the mandrel cannot be ensured by the obtained reconstructed steel ingot after cooling.

The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model.

Claims (10)

1. The mandrel supporting base for the reconstructed steel ingot is characterized by comprising a transverse plate, a thin plate and a plurality of vertical plates, wherein the transverse plate is arranged in parallel with the thin plate, the transverse plate is positioned above the thin plate, the transverse plate and the thin plate are fixedly connected to the vertical plates respectively, and the vertical plates are uniformly distributed along the peripheral surface of the transverse plate.

2. A mandrel support base for a reconstituted ingot according to claim 1, wherein the support base is integrally formed.

3. A mandrel support base for a reconstituted ingot according to claim 1, wherein the support base connects the riser, the cross plate and the sheet by welding.

4. A mandrel support base for reconstructing a steel ingot according to claim 1, wherein the cross plate is a disc, a first through hole is formed in the center, and a plurality of second through holes are uniformly formed around the first through hole.

5. A mandrel support base for a reconstructed steel ingot according to claim 1, wherein said cross plate is composed of a plurality of identical sector-shaped blocks concentric, said number of sector-shaped blocks being equal to the number of said risers.

6. A mandrel support base for reconstructing a steel ingot according to claim 5, wherein the fan-shaped block is composed of a first block, a second block and a third block which are sequentially connected in a radial direction from a center, the second block is located between the first block and the third block, the thicknesses of the first block and the third block are equal, and the thickness of the second block is larger than that of the first block or the third block.

7. A mandrel support base for a reconstructed ingot according to claim 6, wherein the second block is provided with a second through hole.

8. The mandrel support base for reconstructing steel ingots according to claim 1, wherein the vertical plate is rectangular, a plurality of third through holes are formed in the vertical plate, a positioning block is fixedly connected to the upper end of the vertical plate, and the positioning block has a certain inclination angle which is matched with the lower end of the mandrel.

9. A mandrel support base for reconstructing a steel ingot according to claim 8, wherein the side walls of the vertical plate have a wave-shaped structure, and upper and lower grooves are formed at the upper and lower ends of the vertical plate.

10. A mandrel support base for a reconstituted ingot according to claim 1, wherein the thickness of the risers and cross plates is 20-80mm; the thickness of the thin plate is 3-8mm.