CN107234218B - A embedded nozzle of weld pool for preparing amorphous strip - Google Patents
A embedded nozzle of weld pool for preparing amorphous strip Download PDFInfo
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- CN107234218B CN107234218B CN201610483795.5A CN201610483795A CN107234218B CN 107234218 B CN107234218 B CN 107234218B CN 201610483795 A CN201610483795 A CN 201610483795A CN 107234218 B CN107234218 B CN 107234218B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/064—Accessories therefor for supplying molten metal
- B22D11/0642—Nozzles
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Abstract
The invention discloses a weld puddle embedded nozzle for preparing an amorphous strip. The nozzle includes: the nozzle comprises a nozzle main body and a nozzle body, wherein the nozzle main body comprises a molten steel accommodating body with a molten steel accommodating part and a weld pool protecting body extending downwards from the lower end surface of the molten steel accommodating body, and the weld pool accommodating part is formed; and the mouth seam main body is arranged on the lower bottom wall of the molten steel containing body and comprises two detachable mouth seam split plates, the center of each mouth seam split plate is provided with a mouth seam, and the mouth seams enable the molten steel containing body to be communicated with the weld pool protecting body. According to the invention, the processing of an ultra-narrow nozzle gap is realized through split type combination, the embedded nozzle of the weld pool greatly reduces the impact of roller surface airflow on the weld pool, reduces the bubble amount drawn into the bottom of the weld pool in the strip-spraying process, and simultaneously enables laminar molten steel to stably spread on the surface of a cooling body, thereby being beneficial to reducing the surface roughness of a strip material and successfully preparing an amorphous strip material with the thickness of 1-20 mu m.
Description
Technical Field
The invention relates to a nozzle for preparing an amorphous strip, in particular to a weld pool embedded nozzle for preparing the amorphous strip, which is particularly suitable for preparing an amorphous ultrathin strip.
Background
Amorphous metal alloys, due to their lack of long range atomic order, possess a number of important properties over conventional metal alloys to meet a variety of applications, including: (1) Due to electron scattering from atomic disorder, the amorphous magnetic alloy has high resistivity, the loss of the material is reduced, and the use frequency of the metal soft magnetic material is improved; (2) The amorphous state has no macroscopic magnetocrystalline anisotropy, and the magnetization rotation is relatively easy, so that relatively high magnetic conductivity can be obtained; (3) Amorphous alloys have no discontinuities in the microstructure (grain boundaries or segregation) to pin the domain walls. It is relatively easy to move magnetization by a magnetic domain wall, and thus the coercive force Hc is lowered; (4) Many amorphous alloys have good oxidation and corrosion resistance. The properties of the amorphous alloy make the amorphous alloy have wide application prospects in the fields of machinery, communication, aerospace, automobile industry, chemistry and the like.
At present, amorphous alloy produced in large-scale commercial production is mainly amorphous alloy strips, and the preparation of the amorphous alloy strips mostly adopts a plane flow casting method. The main function of the nozzle is to provide high-temperature molten steel with stable liquid flow and pressure for the strip spraying process, so that a weld puddle formed on a copper roller is kept in a stable state, and the stability of the internal structure of the nozzle has an important influence on the quality of the amorphous alloy strip.
The existing nozzle structure is shown in fig. 12, and only comprises a molten steel accommodating body and a nozzle slot 10, wherein the molten steel accommodating body comprises a first molten steel accommodating body side wall (not shown in the figure), a second molten steel accommodating body side wall 1, a third molten steel accommodating body side wall (not shown in the figure), and a fourth molten steel accommodating body side wall 1', the first molten steel accommodating body side wall, the second molten steel accommodating body side wall 1, the third molten steel accommodating body side wall, and the fourth molten steel accommodating body side wall 1' are sequentially connected to form a closed molten steel accommodating body peripheral wall, the nozzle slot 10 is directly processed on a lower bottom wall 5 'of the molten steel accommodating body, and the molten steel accommodating body peripheral wall and the lower bottom wall 5' of the molten steel accommodating body enclose a molten steel accommodating part with an upper opening; the side wall of the first molten steel containing body and the side wall of the third molten steel containing body are parallel to the length direction of the nozzle slot 10.
The nozzle is not only a key process equipment component for producing the amorphous alloy thin strip, but also a consumable product for producing the amorphous alloy thin strip. The quality, service life and cost of the amorphous alloy thin strip determine the quality and production cost of the amorphous alloy thin strip. At present, BN material is used more, the nozzle with the required size and shape is manufactured by milling BN blank, the size of a nozzle slot can be determined according to the process requirement, and boron nitride has good machinability, proper strength and hardness and good wettability with molten steel, so that the nozzle is basically manufactured by using the material in the current practical production. The width of the alloy thin strip depends on the length of the mouth seam of the nozzle, while the thickness of the strip depends mainly on the width of the mouth seam of the nozzle. In order to obtain a completely amorphous structure, the nozzle must be a narrow slit, and the width of the nozzle slit is generally 0.2-0.3 mm, and the thickness of the sprayed amorphous alloy strip is generally 20-40 μm at a proper roller-nozzle spacing. To obtain thinner amorphous alloy strips, narrower nozzle slots are used, however, the prior art uses end mills with a width of less than 1mm for numerical control machining, resulting in high machining and cutting tool costs, and the slotting process makes it difficult to produce nozzle tip slots with slot widths of less than 0.2 mm. The thickness of the strip is one of the key parameters of the amorphous alloy strip, and the reduction of the thickness of the strip can effectively reduce the loss of the strip, thereby influencing the efficiency and the performance of the subsequent iron core. In the prior art, the thickness of the sprayed amorphous alloy strip is not less than 20 mu m, so that the further reduction of the loss of the strip is limited. Therefore, obtaining thinner amorphous alloy strips is a technical problem which needs to be solved urgently at present.
When the amorphous strip is prepared by the plane flow casting method, the weld puddle is in a dynamic balance state, and only when the melt entering the weld puddle from the nozzle pack and the amorphous strip extracted from the bottom of the weld puddle reach dynamic balance, the stable production of the amorphous strip can be continued. The nozzle slot length directly determines the band width and the nozzle slot width directly determines the band thickness. Simultaneously, the horizontal disturbance of weld pool inner laminar flow molten steel and weld pool instability can increase the roughness of strip free surface and the degree of depth of mar to indirectly influence the thickness of strip, on the other hand, the air current enters into the bubble that the weld pool bottom formed along with the chill roll motion, also can indirectly influence the thickness of strip.
As can be seen from FIG. 12, in the prior art, the molten steel container is not provided with a molten pool protective body below the molten steel container, the molten pool is exposed to the air and is rapidly cooled under the influence of the airflow on the surface layer of the rotating cooling roller, the temperature is seriously reduced, in addition, the nozzle is exposed so as to be close to the cooling roller to form a necessary molten pool shape, and the exposed plane of the nozzle is rapidly cooled on the surface of the rapidly rotating cooling roller. If the temperature of the nozzle needs to be kept, the molten metal which continuously flows through the nozzle has a heating effect on the nozzle, and even a complex flame curtain weld pool protection technology is adopted to balance the lost heat of the nozzle and the heat supplement of the molten metal to the nozzle, so that the technical difficulty is high, and the effect is poor. And along with the reduction of the thickness, the influence of the roughness of the free surface of the strip material caused by the instability of the weld pool on the thickness is larger and larger, and meanwhile, bubbles formed when the airflow of the roll surface enters the bottom of the weld pool along with the rotation of the cooling roll are reflected to the surface of the strip material, so that the roughness of the strip material is increased, and the filling coefficient of the strip material is sharply reduced due to the increase of the roughness. Therefore, the prior art is difficult to spray the amorphous ultrathin strip with good surface quality, thickness of 1-20 microns and high filling coefficient.
Disclosure of Invention
Aiming at the problems that an ultra-narrow mouth gap of a traditional NB nozzle is difficult to process and the surface roughness of a strip prepared by the traditional nozzle is large, the invention aims to provide a weld puddle embedded nozzle for preparing an amorphous strip.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an embedded nozzle of weld pool for preparing amorphous strip, includes:
a nozzle body comprising: a molten steel containing body formed with a molten steel containing portion for receiving and buffering molten steel from the nozzle pack; the molten steel accommodating body is provided with a molten steel outlet, and the molten steel outlet is communicated with the molten steel accommodating body; and
the mouth seam main part set up in on the lower diapire of the molten steel container body, including two mouths seam components of a whole that can dismantle board, two after the combination the center that the body board was divided to the mouth seam is formed with the mouth seam, the mouth seam makes the molten steel container body with the weld pool protection body intercommunication.
In the weld pool embedded nozzle for preparing the amorphous strip, as a preferred embodiment, the lower bottom wall of the molten steel containing body is provided with an opening part for fixing the combined two nozzle seam split plates, and the external shapes of the combined two nozzle seam split plates are matched with the external shape of the opening part.
In the weld puddle in-line nozzle for preparing the amorphous strip, as a preferred embodiment, the nozzle body and the nozzle slit body are made of the same or different materials.
In the weld puddle embedded nozzle for preparing the amorphous strip, as a preferred embodiment, any two opposite sides of four sides of the opening part are inverted trapezoids, or the four sides of the opening part are inverted trapezoids; preferably, in the opening part, two opposite side surfaces consistent with the width direction of the nozzle seam are inverted trapezoids, and the length difference of the upper side and the lower side of each inverted trapezoid is 2-10 mm.
In the above-mentioned embedded nozzle of weld puddle for preparing amorphous strip, as a preferred embodiment, two after the combination all be provided with positioning groove on the lateral surface of mouth seam components of a whole that can function independently board, be provided with the location lug on four sides of opening, the location lug card is gone into in the positioning groove with two after will combining mouth seam components of a whole that can function independently board firmly is fixed in the opening.
In the weld puddle in-line nozzle for preparing the amorphous strip, as a preferred embodiment, the width of the nozzle slot is 0.05mm to 0.3mm (such as 0.06mm, 0.08mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm and 0.3 mm), and the length is 0.5mm to 1000mm; more preferably, the mouth slits have a width deviation of less than ± 0.025mm (e.g. 0.002mm, 0.005mm, 0.008mm, 0.01mm, 0.015mm, 0.018mm, 0.02mm, 0.024 mm) along their length.
In the weld puddle in-line nozzle for preparing the amorphous strip, as a preferred embodiment, the upper surfaces of two nozzle slit split plates are provided with coatings.
In the molten steel embedded nozzle for preparing the amorphous strip, as a preferred embodiment, the molten steel containing body comprises a first molten steel containing body side wall, a second molten steel containing body side wall, a third molten steel containing body side wall and a fourth molten steel containing body side wall, wherein the first molten steel containing body side wall, the second molten steel containing body side wall, the third molten steel containing body side wall and the fourth molten steel containing body side wall are sequentially connected to form a closed molten steel containing body peripheral wall, and the molten steel containing body peripheral wall, the molten steel containing body lower bottom wall and two nozzle slit split plates arranged in an opening of the molten steel containing body lower bottom wall enclose the molten steel containing part with an upper opening; the side wall of the first molten steel containing body and the side wall of the third molten steel containing body are parallel to the length direction of the nozzle slot.
In the above described weld puddle in-line nozzle for preparing an amorphous strip, as a preferred embodiment, the weld puddle protector comprises:
the front lip extends vertically and downwards from the lower end surface of the side wall of the first molten steel accommodating body;
the rear lip extends vertically and downwards from the lower end surface of the side wall of the third molten steel accommodating body;
the first side lip extends vertically downwards from the lower end face of the side wall of the second molten steel containing body;
the second side lip vertically extends downwards from the lower end surface of the side wall of the fourth molten steel accommodating body;
the front lip, the first side lip, the rear lip and the second side lip are sequentially connected to form the weld pool accommodating part with an opening at the lower part;
more preferably, the height of the front lip is not less than the height of the rear lip; more preferably, the height of the front lip is higher than the height of the rear lip.
In the above described puddle embedded nozzle for preparing an amorphous strip, as a preferred embodiment, the shape of the puddle containing part is the same as or close to the shape of a puddle formed after molten steel is ejected out of the nozzle slot.
In the weld puddle in-line nozzle for preparing the amorphous strip, as a preferred embodiment, the inner wall of the rear lip is obliquely arranged from top to bottom, and the wall thickness of the rear lip is gradually reduced from top to bottom; preferably, the inner wall of the rear lip is inclined in a straight line type or inclined in a convex arc type.
In the weld puddle embedded nozzle for preparing the amorphous strip, as a preferred embodiment, the shape of the lower end face of the front lip is the same as that of the corresponding cooling roller surface; the shape of the lower end face of the rear lip is the same as that of the corresponding cooling roller surface; the shape of the lower end face of the first side lip is the same as that of the corresponding cooling roller surface; the shape of the lower end face of the second side lip is the same as that of the corresponding cooling roller surface;
preferably, the vertical distance between the lower end surface of the front lip and the surface of the cooling roller is not less than 0.05mm (such as 0.06mm, 0.08mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4 mm); the vertical distance between the lower end surface of the rear lip and the surface of the cooling roller is not less than 0.1mm (such as 0.11mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm and 0.4 mm); more preferably, the lower end face of the rear lip is at a perpendicular distance of 0.1 to 0.3mm from the surface of the cooling roll.
Compared with the prior art, the invention has the advantages that: the processing of super narrow mouth seam has been realized through split type combination, adopts the embedded nozzle of weld pool, greatly reduced the impact of roll surface air current to the weld pool, reduced the bubble volume of weld pool bottom of spouting the area in-process, make laminar flow molten steel stably spread the cooling body surface simultaneously, be favorable to reducing strip roughness, can successfully prepare the amorphous strip that 1-20 mu m is thick. The invention not only improves the utilization rate of the nozzle material, saves energy and production cost, but also improves the surface quality of the amorphous strip, thereby improving the lamination coefficient and performance of the subsequent iron core. Specifically, the method comprises the following steps:
(1) According to the weld puddle embedded nozzle for preparing the amorphous alloy strip, the lower end of the nozzle encloses a cavity corresponding to the shape of the weld puddle, namely, a weld puddle accommodating part, when plane flow casting is carried out, the weld puddle formed by a melt on a roll surface is positioned in the semi-closed cavity of the lower end opening adjacent to the roll surface, and the weld puddle is protected by the peripheral entity of the nozzle, so that the impact of the air flow of the roll surface on the weld puddle is greatly reduced, the condition that the temperature of the nozzle and the weld puddle is reduced along with the rotation of a cooling roll is relieved, the service life of the nozzle can be prolonged, and the quality of the amorphous alloy strip can be improved.
(2) According to the weld puddle embedded nozzle for preparing the amorphous strip, the nozzle gap is formed by combining two nozzle gap split plates, and a main body structure forming the nozzle gap can be independently designed, so that the nozzle is suitable for manufacturing a complicated nozzle structure, and different refractory materials can be selected for a nozzle main body (namely a molten steel accommodating body and a weld puddle protecting body) and a nozzle gap main body (namely two nozzle gap split plates) so as to prevent deformation or meet various process requirements; meanwhile, a large-size nozzle can be manufactured, so that the amorphous alloy strip with a wider size can be sprayed.
(3) According to the weld puddle embedded nozzle for preparing the amorphous strip, the nozzle seam main body is formed by combining the two split plates, the ultra-narrow nozzle seam is formed at the joint of the two split plates, and the split nozzle seam design greatly reduces the processing difficulty of the nozzle, can be suitable for manufacturing a complicated nozzle structure, and prevents deformation or meets various process requirements; meanwhile, a large-size nozzle can be manufactured, so that the amorphous alloy strip with a wider size can be sprayed.
(4) The invention relates to a weld puddle embedded nozzle for preparing amorphous strips, which is formed by combining a nozzle main body and a nozzle seam main body, wherein an opening part is arranged on the upper part of the nozzle main body, namely the lower bottom wall of a molten steel accommodating body, the nozzle seam main body is provided with an appearance matched with the opening part, the sizes of the outer walls of two combined nozzle seam split plates are slightly smaller than the sizes of corresponding side walls of the opening part, the two nozzle seam split plates can be inserted into the opening part from the upper opening of the molten steel accommodating body, and after the nozzle seam split plates are heated and expanded, the outer walls of the two combined nozzle seam split plates and the corresponding side walls of the opening part form closed connection, so that the weld puddle embedded nozzle is formed, the use of high-temperature glue is reduced, and the cost is reduced.
(5) The weld pool embedded nozzle for preparing the amorphous alloy strip is formed by combining a nozzle main body and a nozzle seam main body, wherein the nozzle main body can be repaired repeatedly and used for multiple times, so that the nozzle cost can be greatly reduced, and the production cost of the amorphous alloy strip is greatly reduced.
(6) According to the weld puddle embedded nozzle for preparing the amorphous strip, the front lip of the nozzle is tightly attached to the surface of the roller, so that the probability that airflow on the surface of the roller is involved in the bottom of the weld puddle in the strip spraying process is greatly prevented, the roughness of the surface of the prepared strip, which is attached to the roller, is reduced, and the surface quality of the surface of the strip, which is attached to the roller, is improved.
(7) According to the weld puddle embedded nozzle for preparing the amorphous strip, the rear lip of the nozzle is tightly connected with the lower end of the weld puddle, so that a scraping and correcting effect is formed on the free surface of the weld puddle, the transverse disturbance of the amorphous alloy strip on laminar molten steel is reduced, the roughness of the free surface of the prepared strip is reduced, and the surface quality of the free surface of the strip is improved.
Drawings
FIG. 1 is a perspective view of the external structure of a puddle embedded nozzle of the present invention;
FIG. 2 isbase:Sub>A schematic plan view of the weld puddle in-line nozzle of FIG. 1 cut along line A-A, showingbase:Sub>A front view of the weld puddle in-line nozzle of the present invention cut along line A-A of FIG. 1;
FIG. 3 is a schematic plan view of a weld puddle in-line nozzle without a spout body, i.e., two spout body panels, i.e., a front view of the nozzle body, corresponding to FIG. 2 without the spout body;
FIG. 4 is a top view of a puddle in-line nozzle of the present invention;
FIG. 5 is a top view of the weld puddle in-line nozzle, i.e., nozzle body, without the first slit split plate and the second slit split plate;
FIG. 6 is a bottom view of a puddle embedded nozzle of the present invention;
FIG. 7 is a bottom view of the weld puddle in-line nozzle, i.e., nozzle body, without the first and second slit split plates;
FIG. 8 is a schematic plan view of the weld puddle in-line nozzle of FIG. 1 cut along line B-B, showing a left side view of the weld puddle in-line nozzle of FIG. 1 cut along line B-B, wherein the inner surface of the rear lip is inclined in a linear manner;
FIG. 9 is a left side view of the weld puddle in-line nozzle, i.e., nozzle body, without the first and second slit split plates, corresponding to FIG. 8 without the first and second slit split plates;
FIG. 10 is a schematic plan view of the weld puddle in-line nozzle of FIG. 1 cut along line B-B, showing a left side view of the weld puddle in-line nozzle of the present invention cut along line B-B of FIG. 1, wherein the inner surface of the rear lip is inclined in a convex arc streamline shape;
FIG. 11 is a bottom view of an alternative spout body, namely a first spout split body panel and a second spout split body panel, assembled;
fig. 12 is a schematic view of a conventional nozzle structure.
The reference numbers are as follows:
1. a side wall of the second molten steel containing body; 11. the inner surface of the side wall of the second molten steel accommodating body; 12. the lower end surface of the side wall of the second molten steel accommodating body; 1', a side wall of a fourth molten steel containing body; 11', the inner surface of the side wall of the fourth molten steel containing body; 12' and the lower end surface of the side wall of the fourth molten steel containing body; 2. a first molten steel containing body side wall; 21. the inner surface of the side wall of the first molten steel accommodating body; 22. the lower end surface of the side wall of the first molten steel accommodating body; 2', a side wall of the third molten steel containing body; 21' and the inner surface of the side wall of the third molten steel containing body; 22' and the lower end surface of the side wall of the third molten steel containing body;
3. a first side lip; 32. a first side lip lower end surface; 3', a second side lip; 32', a second side lip lower end surface; 4. the anterior lip; 41. an inner surface of the front lip; 42. the lower end face of the front lip; 4', the rear lip; 41', a rear lip inner surface (also referred to as a rear lip inner wall); 42', the lower end face of the rear lip;
5,5', a lower bottom wall of the molten steel container; 51. an opening part; 6. a molten steel accommodating part; 7. a weld pool accommodating part; 8. a first nozzle slit split plate; 82, a lower bottom surface of the first nozzle split plate; 8', a second mouth seam split plate; 82', the lower bottom surface of the second nozzle split plate; 83' and a positioning groove; 9. an outer edge; 10. mouth seam
Detailed Description
In order that the present disclosure may be more readily and clearly understood, reference will now be made in detail to the present disclosure, examples of which are illustrated in the accompanying drawings.
The invention provides a weld puddle embedded nozzle for preparing an amorphous strip, which is shown in figures 1-11 and comprises: the nozzle body and set up the mouth seam main part that is used for forming the mouth seam on the nozzle body, the nozzle body includes that the molten steel holds the body and hold the body from the molten steel and lower extreme downwardly extending's weld pool protection body, the mouth seam main part set up in on the lower diapire of the molten steel holding body to form the mouth seam and make the molten steel holding body and weld pool protection body intercommunication through the mouth seam. The above components are explained one by one below.
A molten steel containing body formed with a molten steel containing portion 6 for receiving and buffering molten steel from the nozzle pack; the molten steel containing part 6 may be in the shape of a cylinder, a rectangular parallelepiped, a cube, an inverted trapezoid, or the like.
Specifically, the molten steel containing body includes a first molten steel containing body side wall 2, a second molten steel containing body side wall 1, a third molten steel containing body side wall 2', and a fourth molten steel containing body side wall 1'. The side edges of the first molten steel containing body side wall 2, the second molten steel containing body side wall 1, the third molten steel containing body side wall 2 'and the fourth molten steel containing body side wall 1' are sequentially connected to form a closed molten steel containing body peripheral wall, and the inner surface 21 of the first molten steel containing body side wall, the inner surface 11 of the second molten steel containing body side wall, the inner surface 21 'of the third molten steel containing body side wall and the inner surface 11' of the fourth molten steel containing body side wall can be inverted trapezoids, see fig. 2-4 and fig. 8-10, so that the molten steel containing part 6 of the inverted trapezoids is formed; the outer surface of the side wall of the first molten steel containing body, the outer surface of the side wall of the second molten steel containing body, the outer surface of the side wall of the third molten steel containing body and the outer surface of the side wall of the fourth molten steel containing body are vertically downward rectangles.
The molten steel containing body further comprises a molten steel containing body lower bottom wall 5, the molten steel containing body lower bottom wall 5 is provided with an opening part 51 for fixing the combined first nozzle seam split plate 8 and the second nozzle seam split plate 8', the opening part 51 is opened at the central position of the molten steel containing body lower bottom wall 5 and enables the molten steel containing body to be communicated with the weld puddle protection body, the opening part 51 can be a cylinder, a cuboid, a cube, an inverted trapezoid and the like, preferably, any two opposite side surfaces of the four side surfaces of the opening part 51 are inverted trapezoids, or the four side surfaces of the opening part 51 are inverted trapezoids, namely, the opening part 51 is an inverted trapezoid; more preferably, two opposite sides of the opening portion 51, which are consistent with the width direction of the spout 10, are inverted trapezoids, and the length difference between the upper side and the lower side of the inverted trapezoids is 2-10 mm, which is beneficial for the structure of the spout body to be clamped into the opening portion and fix the spout body, see fig. 1-10. The outer shape of the first slit nozzle body plate 8 and the second slit nozzle body plate 8 'after combination is matched with the outer shape of the opening portion 51, and the first slit nozzle body plate and the second slit nozzle body plate can be just clamped into the opening portion 51, namely, the sizes of the outer walls of the first slit nozzle body plate 8 and the second slit nozzle body plate 8' after combination are slightly smaller than the sizes of the wall surfaces of the opening portion 51, the slit nozzle body can be inserted into the opening portion 51 from the upper opening of the nozzle body, and the outer wall surface of the slit nozzle body forms closed connection with the inner wall surface of the opening portion after being heated and expanded. In order to more firmly fix the spout body in the opening portion 51, the lower portions of the four sides of the opening portion are provided with positioning protrusions (not shown in the drawings), and the outer side of the spout body is provided with a plurality of positioning grooves 83 'matched with the positioning protrusions, see fig. 11, so that the positioning protrusions are clamped in the positioning grooves 83', thereby realizing more firm fixation.
The molten steel containing part 6 is characterized in that the molten steel containing part comprises a molten steel containing body peripheral wall, a molten steel containing body lower bottom wall 5 and two nozzle seam split plates 8,8' arranged in an opening part 51 of the molten steel containing body lower bottom wall, wherein the molten steel containing part 6 is surrounded by an upper opening; the side walls 2 and 2' of the first molten steel containing body and the third molten steel containing body are parallel to the length direction of the nozzle slot 10.
The weld pool protection body extends downwards from the lower end face of the molten steel containing body to form a weld pool containing part 7 for protecting the weld pool formed after the molten steel nozzle is welded by 10. The shape of the weld pool accommodating part 7 can be any possible shape such as a cylinder, a cuboid, a cube, an inverted trapezoid and the like, and preferably, the shape of the weld pool accommodating part 7 is the same as or close to the shape of a weld pool formed after the molten steel ejecting nozzle seam 10. Thus, the weld pool can be fully protected and the shape of the weld pool is not damaged.
Specifically, the weld pool protector includes: and a front lip 4 vertically extending downwards from the lower end surface 22 of the side wall of the first molten steel container, wherein the outer surface of the front lip 4 is flush with the outer wall surface of the side wall 2 of the first molten steel container, and the inner surface 41 of the front lip can be vertically extended downwards, can also be convexly curved downwards or linearly inclined downwards, and preferably has a thickness slightly larger than that of the side wall 2 of the first molten steel container, and the inner surface 41 of the front lip vertically extends downwards, so that the structure is the same as or close to the shape of the corresponding surface of the weld puddle. A rear lip 4 'vertically extending downwards from the lower end surface 22' of the side wall of the third molten steel containing body, the outer surface of the rear lip 4 'is flush with the outer wall surface of the side wall 2' of the third molten steel containing body, the inner surface (i.e. inner wall) 41 'of the rear lip can be vertically extending downwards, or can be a convex arc-shaped downward extension or a linear type inclined downward extension, preferably, the inner surface 41' of the rear lip is inclined from top to bottom, and the wall thickness of the rear lip is gradually reduced from top to bottom; more preferably, the inner wall of the rear lip is linearly inclined (see fig. 9) or convexly curved (see fig. 10), and the thickness of the upper end of the rear lip 4 'is slightly larger than that of the side wall 2' of the third molten steel containing body, so that the structure is the same as or close to the shape of the corresponding surface of the weld puddle. And the first side lip 3 vertically extends downwards from the lower end surface 12 of the side wall of the second molten steel container, the outer surface of the first side lip 3 is flush with the outer wall surface of the side wall 1 of the second molten steel container, the inner surface of the first side lip can vertically extend downwards, also can extend downwards in a convex arc shape or in a linear inclined way, preferably, the thickness of the first side lip is slightly larger than that of the side wall 1 of the second molten steel container, and the inner surface of the first side lip vertically extends downwards, so that the structure is the same as or close to the shape of the corresponding surface of the weld puddle. And a second side lip 3' vertically extending downwards from the lower end surface 12' of the fourth molten steel container side wall, wherein the outer surface of the second side lip 3' is flush with the outer wall surface of the fourth molten steel container side wall 1', the inner surface of the second side lip can be vertically extended downwards, or can be convexly curved or linearly inclined to extend downwards, preferably, the thickness of the second side lip is slightly larger than that of the fourth molten steel container side wall 1', and the inner surface of the second side lip vertically extends downwards, so that the structure is the same as or close to the shape of the corresponding surface of the weld puddle. The side edges of the front lip 4, the first side lip 3, the rear lip 4 'and the second side lip 3' are connected in sequence to form a weld pool accommodating portion 7 of the lower opening.
The height of the front lip 4 is not lower than that of the rear lip 4'; preferably, the height of the front lip 4 is higher than the height of the rear lip 4'. The shape of the front lip lower end face 42 is the same as the shape of the corresponding cooling roll surface; the shape of the lower end face 42' of the rear lip is the same as the shape of the corresponding cooling roller surface; the shape of the first side lip lower end surface 32 is the same as the shape of the corresponding cooling roll surface; the shape of the second side lip lower end surface 32' is the same as the shape of the corresponding cooling roll surface. Preferably, the perpendicular distance between the front lip lower end face 42 and the surface of the cooling roller is not less than 0.05mm (such as 0.06mm, 0.08mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4 mm); the vertical distance between the lower end face 42' of the rear lip and the surface of the cooling roller is not less than 0.1mm (such as 0.11mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm and 0.4 mm); more preferably, the rear lip lower end face 42' is spaced from the cooling roll surface by a perpendicular distance of 0.1 to 0.3mm. The front lip 4 is tightly attached to the surface of the roller to prevent air bubbles from being involved in the process of spraying the strip. The back lip 4' is closely connected with the lower end of the weld pool, and the scraping and correcting effects are formed on the free surface of the weld pool, so that the transverse disturbance of the amorphous alloy strip to the laminar molten steel is reduced.
In the present invention, the front lip 4 and the rear lip 4 'are relative to the moving direction of the cooling roller, and after the cooling roller is started, the lowest point of the cooling roller rotates to the vicinity of the nozzle to pass through the front lip 4 firstly and then pass through the rear lip 4' of the nozzle in the static state.
The nozzle seam main body is arranged in an opening part 51 of the lower bottom wall 5 of the molten steel containing body and is formed by combining two detachable nozzle seam split plates 8,8', a nozzle seam 10 is formed in the central area of the two combined nozzle seam split plates 8,8', and referring to figures 4, 6 and 11, the nozzle seam 10 enables the molten steel containing body to be communicated with the weld pool protecting body. The spout body is contoured to the shape of the opening 51 so that it can snap fit into the opening 51 and form a sealed connection. In order to better fix the nozzle split body, a plurality of positioning grooves 83 'may be disposed on the outer side surfaces of the two assembled nozzle split body plates, referring to fig. 11, the positioning grooves 83' are open on the outer side surfaces of the nozzle split body plates and the lower bottom surface 82 of the first nozzle split body plate or the lower bottom surface 82 'of the first nozzle split body plate, and corresponding positioning protrusions are also disposed on four side surfaces of the opening portion 51 and disposed on the lower portions of the four side surfaces of the opening portion 51 to achieve the engagement of the positioning grooves 83' with the positioning protrusions, and the positioning protrusions are engaged in the positioning grooves 83 'to firmly fix the two assembled nozzle split body plates 8,8' to the opening portion 51.
The mouth seam 10 has a width of 0.05mm to 0.3mm (e.g., 0.06mm, 0.08mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3 mm) and a length of 0.5mm to 1000mm; more preferably, the mouth slits have a width deviation of less than ± 0.025mm (e.g. 0.002mm, 0.005mm, 0.008mm, 0.01mm, 0.015mm, 0.018mm, 0.02mm, 0.024 mm) along their length.
The nozzle body and the nozzle slit body may be made of BN, mgO, siC, si3N4, BN, or other applicable materials. The nozzle split plate, namely the nozzle split body and the nozzle body, can be made of different materials, for example, the nozzle split plate can be made of boron nitride composite materials which are easy to process and have good wettability with molten steel, and the nozzle body can be made of zirconia or a metal shell with better heat deformation resistance, namely, a special material nozzle which is more matched with the nozzle body can be designed according to the performances of different molten steel.
The weld puddle embedded nozzle provided by the invention is suitable for producing amorphous strips with various thicknesses, and is particularly suitable for producing amorphous alloy ultrathin strips with the thickness of less than 20 mu m.
After the nozzle seam is combined, the nozzle seam is formed in the center of the two nozzle seam split plates, so that the nozzle seam is easy to process, the problem that the traditional milling cutter is difficult to prepare the ultra-narrow nozzle seam is solved, and the ultra-narrow nozzle seam is particularly suitable for processing the ultra-narrow nozzle seam for preparing the amorphous ultra-thin belt.
The upper surfaces of the first nozzle slit split plate 8 and the second nozzle slit split plate 8', namely, the surfaces opposite to the lower bottom surface 82 of the first nozzle slit split plate and the lower bottom surface 82' of the second nozzle slit split plate, namely, the surfaces directly contacted with the molten steel are provided with coatings, so that the wettability of the molten steel and the nozzle slit split plate can be improved, the difficulty in unpacking during strip manufacturing is reduced, and the coating is also significant to industrial production.
The present invention is illustrated by the following specific examples.
Example 1
The invention relates to a weld pool embedded nozzle for spraying an amorphous alloy thin strip, which is formed by combining a nozzle main body and a nozzle seam main body, wherein in the embodiment, the nozzle main body is made of BN (boron nitride), and the nozzle seam main body is made of a BN composite material; two opposite outer side surfaces of the nozzle seam main body consistent with the nozzle seam width direction form a trapezoid with a wide upper part and a narrow lower part, in addition, the two opposite outer side surfaces of the nozzle seam main body consistent with the nozzle seam length direction are rectangles, the height of the nozzle main body is 8mm, the width of the upper surface of the nozzle main body (namely the nozzle seam width direction) is 12mm, and the width of the lower surface of the nozzle main body (namely the nozzle seam width direction) is 8mm; the size of the inner wall of the opening part is 0.02mm larger than that of the corresponding outer wall of the mouth seam main body. The vertical distance between the lower end face of the front lip of the nozzle and the cooling roller right below the front lip is 0.05mm, the vertical distance between the lower end face of the rear lip of the nozzle and the cooling roller right below the rear lip of the nozzle is 0.15mm, and the vertical distance between the nozzle seam and the cooling roller right below the nozzle seam is 0.25mm. When the nozzle is used, the nozzle body is inserted into the opening of the nozzle body from above the nozzle body to form a combined nozzle, and the periphery of the combined nozzle is covered with a refractory material and fixed to the lower end of the nozzle bag. Then preheating the lower bottom wall part of the molten steel containing body to 1250 ℃, and forming closed connection between the outer wall of the nozzle seam main body and the inner wall of the opening part after the nozzle seam main body is heated and expanded. The nozzle slot body and the nozzle body form a solid structure of the whole combined nozzle; the outlet at the lower end of the nozzle pack is communicated with the internal hollow structure of the molten steel containing body, the nozzle seam and the weld pool protecting body to form a channel of high-temperature molten steel. High-temperature molten steel in production sequentially passes through the nozzle pack main body, the nozzle pack lower end outlet, the molten steel containing part, the nozzle slot and the weld puddle containing part and is poured on a cooling roller rotating at a high speed, and the amorphous alloy thin strip with required width and thickness is obtained. After the primary spray belt is finished, the combined nozzle is taken down, stands and cools to room temperature, the combined nozzle is restored to the state that the size of the outer wall of the nozzle seam main body is smaller than that of the inner wall of the opening part, at the moment, the nozzle seam main body can be taken out of the nozzle main body, and a new nozzle seam main body is inserted again for use.
As the width of the nozzle slot is a main factor for determining the thickness of the strip, the invention sets a group of comparison tests to investigate the influence of the nozzle slot on the thickness of the amorphous alloy strip. The components of the amorphous alloy strip prepared by the invention and the prior art are Fe5Co70Si15B10, a comparison experiment is carried out under the same process by respectively adopting the weld puddle embedded nozzle and the conventional nozzle (shown in figure 12), and specific process parameters for preparing the amorphous alloy strip are listed in Table 1. The same technological parameters are adopted, the embedded nozzle of the weld puddle and the traditional nozzle are adopted to prepare the amorphous alloy thin strip, and experimental results show that the width of a nozzle slot directly determines the thickness of the strip when other technological conditions are the same, the thickness of the strip prepared by adopting the embedded nozzle of the weld puddle is obviously smaller, the thickness of the strip is more consistent, the surface roughness of the strip is greatly reduced in the same ratio, and the comparison of specific results is shown in table 1. The serial numbers 1-5, 7 and 9 are amorphous alloy strips prepared by using the weld puddle embedded nozzle, and the serial numbers 6, 8 and 10 are amorphous alloy strips prepared by using the traditional nozzle. And the contrast is visible, and the ultra-thin amorphous strip with good surface quality is successfully prepared by adopting the embedded nozzle of the weld puddle.
TABLE 1 Process parameters and results for using the weld puddle embedded nozzle of the present invention and the existing conventional nozzle
Example 2
The invention relates to a weld puddle embedded nozzle for spraying an amorphous alloy thin strip, which is formed by combining a nozzle main body and a nozzle seam main body, wherein in the embodiment, the nozzle main body is made of BN (boron nitride), and the nozzle seam main body is made of a BN composite material; two opposite outer side surfaces of the nozzle seam main body consistent with the nozzle seam width direction form a trapezoid with the upper part wide and the lower part narrow, in addition, two opposite outer side surfaces of the nozzle seam main body consistent with the nozzle seam length direction are rectangles, the height of the nozzle main body is 8mm, the width of the upper surface of the nozzle main body (namely the nozzle seam width direction) is 12mm, and the width of the lower surface of the nozzle main body (namely the nozzle seam width direction) is 8mm; the size of the inner wall of the opening part is 0.02mm larger than that of the corresponding outer wall of the mouth seam main body. The nozzle slot length is 10mm, the slot width is 0.15mm, and the vertical distance between the nozzle slot and the cooling roller right below the nozzle slot is 0.25mm. When the nozzle is used, the nozzle body is inserted into the opening of the nozzle body from above the nozzle body to form a combined nozzle, and the periphery of the combined nozzle is covered with a refractory material and fixed to the lower end of the nozzle bag. Then preheating the lower bottom wall part of the molten steel containing body to 1250 ℃, and forming closed connection between the outer wall of the nozzle seam main body and the inner wall of the opening part after the nozzle seam main body is heated and expanded. The nozzle slot main body and the nozzle main body form a solid structure of the whole combined nozzle; the outlet at the lower end of the nozzle pack is communicated with the internal hollow structure of the molten steel containing body, the nozzle seam and the weld pool protecting body to form a channel of high-temperature molten steel. High-temperature molten steel in production sequentially passes through the nozzle pack main body, the nozzle pack lower end outlet, the molten steel containing part, the nozzle slot and the weld puddle containing part and is poured on a cooling roller rotating at a high speed, and the amorphous alloy thin strip with required width and thickness is obtained. After the primary spray belt is finished, the combined nozzle is taken down, stands and cools to room temperature, the combined nozzle is restored to the state that the size of the outer wall of the nozzle seam main body is smaller than that of the inner wall of the opening part, at the moment, the nozzle seam main body can be taken out of the nozzle main body, and a new nozzle seam main body is inserted again for use.
The method is characterized in that the transverse disturbance of molten steel of the molten pool inner layer flow and the instability of the molten pool can increase the roughness of the free surface of the strip and the depth of scratches, so that the thickness of the strip is indirectly influenced, and on the other hand, the air flow enters the bottom of the molten pool along with the movement of a cooling roller to form bubbles and also indirectly influence the thickness of the strip. Experimental results show that other process conditions are the same, the thickness of a strip prepared by adopting the weld puddle embedded nozzle is obviously smaller, the thickness of the strip is more consistent, the roughness of the roll surface of the prepared strip is greatly reduced along with the reduction of the distance from the front lip of the nozzle to the surface of a cooling roll, but when the distance from the front lip of the nozzle to the roll surface is less than 0.05mm, the nozzle is easy to touch the roll surface to cause damage to the roll surface, and therefore the distance from the front lip of the nozzle to the roll surface is not suitable to be less than 0.05mm. The nozzle gap is 0.25-0.5mm away from the roller surface to form a stable weld pool, and the higher the surface tension of the melt, the higher the height of the weld pool formed under the same condition. The back lip closely links to each other with the weld pool lower extreme, and the weld pool lower extreme closely links to each other, forms to weld pool free surface and scrapes pressure and correction effect, has reduced the horizontal disturbance of metallic glass strip to the laminar flow molten steel. The distance of the minimum strip thickness is reduced relative to the front lip of the weld puddle, so that the distance from the rear lip to the roll surface is not less than 0.1mm, the rear lip is too low to be easily and directly contacted with a solidified strip, scratches are formed on the free surface of the strip, and if the rear lip is too high, for example, the distance between the rear lip and the roll mouth is the same, the rear lip of the nozzle cannot play a role in scraping the free surface of the weld puddle and correcting the transverse disturbance of the laminar molten steel. The results are shown in Table 2. The serial numbers 1-5 are amorphous alloy strips prepared by using the embedded weld puddle nozzle and different distances from the front lip of the nozzle to the surface of the roller. The serial numbers of 6-10 are amorphous alloy strips prepared by using the weld pool embedded nozzle and different distances from the rear lip of the nozzle to the roll surface. The contrast is visible, adopts the embedded nozzle of weld puddle, through coordinating the distance of nozzle front lip and nozzle back lip distance roll surface, can the effectual surface roughness who improves preparation strip to successfully prepare the high-quality ultra-thin amorphous strip in surface.
Table 2 example 2 process parameters and results
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.
Claims (11)
1. The utility model provides an embedded nozzle of weld pool for preparing amorphous strip which characterized in that includes:
a nozzle body comprising:
a molten steel containing body formed with a molten steel containing portion for receiving and buffering molten steel from the nozzle pack; and
the molten steel accommodating body is used for accommodating molten steel and is provided with a molten pool protecting body, and the molten pool protecting body extends downwards from the lower end surface of the molten steel accommodating body to form a molten pool accommodating part for protecting a molten pool formed after the molten steel is ejected out of a nozzle slot; and
the nozzle seam main body is arranged on the lower bottom wall of the molten steel containing body and comprises two detachable nozzle seam split plate bodies, a nozzle seam is formed in the center of the two assembled nozzle seam split plate bodies, and the nozzle seam enables the molten steel containing body to be communicated with the weld pool protecting body; the width of the mouth seam is 0.05 mm-0.3 mm, and the length is 0.5 mm-1000 mm;
the molten steel accommodating body comprises a first molten steel accommodating body side wall, a second molten steel accommodating body side wall, a third molten steel accommodating body side wall and a fourth molten steel accommodating body side wall, the first molten steel accommodating body side wall, the second molten steel accommodating body side wall, the third molten steel accommodating body side wall and the fourth molten steel accommodating body side wall are sequentially connected to form a closed molten steel accommodating body peripheral wall, and the molten steel accommodating body peripheral wall, the molten steel accommodating body lower bottom wall and two nozzle split body plates arranged in an opening part of the molten steel accommodating body lower bottom wall enclose the molten steel accommodating part with an upper opening; the side wall of the first molten steel accommodating body and the side wall of the third molten steel accommodating body are parallel to the length direction of the nozzle slot;
the weld puddle protection body comprises: the front lip extends vertically and downwards from the lower end surface of the side wall of the first molten steel accommodating body; the rear lip extends vertically downwards from the lower end face of the side wall of the third molten steel containing body; the first side lip extends vertically downwards from the lower end face of the side wall of the second molten steel accommodating body; the second side lip vertically extends downwards from the lower end surface of the side wall of the fourth molten steel accommodating body; the front lip, the first side lip, the rear lip and the second side lip are sequentially connected to form the weld pool accommodating part with an opening at the lower part; the height of the front lip is not lower than that of the rear lip;
the shape of the weld puddle accommodating part is the same as or close to that of a weld puddle formed after molten steel is ejected out of the nozzle seam; the inner wall of the rear lip is obliquely arranged from top to bottom, and the wall thickness of the rear lip is gradually reduced from top to bottom;
the shape of the lower end face of the front lip is the same as that of the corresponding cooling roller surface; the shape of the lower end face of the rear lip is the same as that of the corresponding cooling roller surface; the shape of the lower end face of the first side lip is the same as that of the corresponding cooling roller surface; the shape of the lower end face of the second side lip is the same as that of the corresponding cooling roller surface;
the vertical distance between the lower end surface of the front lip and the surface of the cooling roller is not less than 0.05mm; and the vertical distance between the lower end surface of the rear lip and the surface of the cooling roller is not less than 0.1mm.
2. A weld puddle in-line nozzle for preparing amorphous strips as claimed in claim 1, wherein the lower bottom wall of said molten steel containing body is provided with an opening portion for fixing two assembled nozzle seam split plates, and the external shapes of the two assembled nozzle seam split plates match the external shape of the opening portion.
3. The puddle in-line nozzle for preparing an amorphous strip as defined in claim 1, wherein the nozzle body and the nozzle slit body are made of the same or different materials.
4. The puddle in-line nozzle for preparing an amorphous strip according to claim 2, wherein any two opposite sides of the four sides of the opening portion are inverted trapezoids, or all four sides of the opening portion are inverted trapezoids.
5. The weld puddle in-line nozzle for preparing amorphous strips as claimed in claim 4, wherein two opposite sides of the opening portion, which are consistent with the width direction of the nozzle slit, are inverted trapezoids, and the length difference between the upper side and the lower side of each inverted trapezoid is 2-10 mm.
6. The weld puddle in-line nozzle for preparing amorphous strips as defined in claim 2, wherein the two assembled slit nozzle plates are provided with positioning grooves on the outer side surfaces thereof, and positioning protrusions are provided on four side surfaces of the opening portion, and the positioning protrusions are engaged with the positioning grooves to firmly fix the two assembled slit nozzle plates to the opening portion.
7. The puddle in-line nozzle for preparing an amorphous ribbon as defined in claim 1, wherein the width deviation of the spout is less than ± 0.025mm along the length of the spout.
8. The puddle in-line nozzle for preparing an amorphous ribbon as defined in claim 7, wherein the upper surfaces of two slit nozzle split plates are provided with a coating.
9. The puddle in-line nozzle for preparing an amorphous ribbon as defined in claim 1, wherein the front lip has a height greater than a height of the rear lip.
10. The weld puddle in-line nozzle for preparing amorphous strips as defined in claim 1, wherein the inner wall of the rear lip is inclined in a linear manner or in a convex arc manner.
11. The puddle in-line nozzle for preparing an amorphous strip according to claim 1, wherein the perpendicular distance between the lower end surface of the rear lip and the surface of the cooling roller is 0.1-0.3mm.
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| CN202683997U (en) * | 2012-08-10 | 2013-01-23 | 秦皇岛市燕秦纳米科技有限公司 | Combined nozzle used for amorphous alloy belt manufacturing equipment |
| CN103406507B (en) * | 2013-08-22 | 2015-12-23 | 青岛云路新能源科技有限公司 | A kind of non-crystaline amorphous metal carrying device built up nozzle |
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| CN205732864U (en) * | 2016-06-27 | 2016-11-30 | 安泰科技股份有限公司 | For preparing the embedded nozzle of the weld pool of amorphous band |
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| JPS59133945A (en) * | 1983-01-20 | 1984-08-01 | Matsushita Electric Ind Co Ltd | Production of ultraquickly cooled light-gage metallic strip |
| JPS6021160A (en) * | 1983-07-13 | 1985-02-02 | Matsushita Electric Ind Co Ltd | Production of ultraquickly cooled light-gage metallic strip |
| JPS60115349A (en) * | 1983-11-25 | 1985-06-21 | Hitachi Ltd | Continuous casting device for thin metallic plate |
| JPS63160758A (en) * | 1986-12-23 | 1988-07-04 | Tokin Corp | Manufacture of amorphous thin metal strip |
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