CN114147191B - Casting and strip throwing process of ferrozirconium cast sheet - Google Patents
Casting and strip throwing process of ferrozirconium cast sheet Download PDFInfo
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- CN114147191B CN114147191B CN202111252079.3A CN202111252079A CN114147191B CN 114147191 B CN114147191 B CN 114147191B CN 202111252079 A CN202111252079 A CN 202111252079A CN 114147191 B CN114147191 B CN 114147191B
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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
- B22D11/0611—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a single casting wheel, e.g. for casting amorphous metal strips or wires
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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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
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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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C16/00—Alloys based on zirconium
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Abstract
The invention discloses a casting strip casting process of a ferrozirconium cast sheet, which comprises the following steps: step one, preparing raw materials according to the following component proportion by weight: 58 to 60 portions of Zr, 2 to 4 portions of Hf, and 38 to 40 portions of Fe; step two, mixing the prepared raw materials, putting the mixture into a smelting and casting furnace, and pumping out air in the smelting and casting furnace to reach a vacuum state; filling inert protective gas into the smelting and casting furnace, heating and smelting the mixed raw materials under the protective atmosphere of the inert protective gas, and preserving the temperature of the smelted molten raw materials at 1600-1700 ℃ for 5 minutes; and step four, outputting the heat-preserved molten raw materials from a pouring gate of a sheet smelting and casting furnace, enabling the molten raw materials to fall onto a rotating casting roller, and then carrying out casting to obtain a cast sheet, wherein the output speed of the raw materials in the pouring gate is 1.00-1.30 kg/s, and the rotating speed of the casting roller is 60-65 rpm. The invention has the advantages that the thickness of the prepared ferrozirconium cast sheet meets the requirement, the distribution is uniform, the metallographic structure is clear, and the grain size is uniform.
Description
Technical Field
The invention relates to the technical field of cast sheet production, in particular to a casting melt-spinning process of a ferrozirconium cast sheet.
Background
The newly researched research shows that the grain number can be better refined by replacing niobium with zirconium (Zr) and the performance is more excellent, the grains are not easy to grow in the casting process of the neodymium iron boron casting sheet, but the melting point of pure zirconium is 1852 ℃, the direct participation in the production of the neodymium iron boron casting sheet can bring too high power consumption and uncontrollable performance, the zirconium iron alloy has the problem of uniformity and is not suitable for the production of the neodymium iron boron casting sheet, and the zirconium iron casting sheet in the form of solid solution participates in the production of the neodymium iron boron casting sheet, so that the melting point can be effectively reduced, and the stability and uniformity can be improved.
For example, referring to a belt-spinning process of a neodymium iron boron cast sheet, a molten raw material is output onto a rotating copper roller, and the molten raw material is instantly condensed into a cast sheet through belt spinning of the copper roller, when the cast sheet is applied to a zirconium iron cast sheet, because the mixed molten raw material of the zirconium iron cast sheet is inferior to the mixed molten raw material of the neodymium iron boron cast sheet in fluidity, difficulties in processing the raw material, casting speed of the molten raw material, casting mode and control of rotation speed of the copper roller exist, for example, when the copper roller rotates too slowly, the molten raw material is cut off or directly solidifies on the copper roller, and when the copper roller rotates too fast, the thickness requirement of the cast sheet cannot be met; for example, the casting speed of the molten raw material is too low, so that the cast sheet is in a lump shape, large in thickness and disordered in metallographic structure, and the casting speed is too high, so that the molten raw material cannot be condensed in time or the cast sheet is difficult to separate after being spun, so that how to integrate a plurality of factors to manufacture the required ferrozirconium cast sheet is a great problem in the production of the ferrozirconium cast sheet at present.
Disclosure of Invention
The invention aims to provide a casting strip-throwing process of a ferrozirconium cast sheet. The method has the advantages that the thickness of the prepared ferrozirconium cast sheet meets the requirement, the distribution is uniform, the metallographic structure is clear, and the grain size is uniform.
The technical scheme of the invention is as follows: a casting strip casting process of a ferrozirconium cast sheet comprises the following steps:
step one, preparing raw materials according to the following component proportion by weight: 58 to 60 portions of Zr, 2 to 4 portions of Hf and 38 to 40 portions of Fe;
step two, mixing the raw materials prepared in the step one, putting the mixture into a smelting and casting furnace, and pumping out air in the smelting and casting furnace to reach a vacuum state;
filling inert protective gas into the smelting and casting furnace, heating and smelting the mixed raw materials under the protective atmosphere of the inert protective gas, and preserving the temperature of the smelted molten raw materials at 1600-1700 ℃ for 5 minutes;
and step four, outputting the molten raw material subjected to heat preservation in the step three from a pouring gate of a sheet smelting and casting furnace, enabling the molten raw material to fall on a rotating casting roller, and then carrying out tape throwing to obtain a cast sheet, wherein the output speed of the raw material in the pouring gate is 1.00-1.30 kg/s, and the rotating speed of the casting roller is 60-65 rpm.
Compared with the prior art, the invention has the beneficial effects that: the method is characterized in that zirconium, hafnium and iron raw materials with proper proportion are selected as casting piece quality, the raw materials are mixed and then are subjected to vacuum pumping, smelting and other treatments to meet the casting and strip throwing requirements, and after the raw materials are output, the casting speed of the molten raw materials and the rotating speed of a casting roller are controlled to finally obtain the cast zircaloy iron piece with the thickness meeting the requirements, uniform distribution, clear metallographic structure and uniform grain size.
In the casting strip casting process of the cast sheet of the ferrozirconium, in the fourth step, the output speed of the raw materials in the pouring gate is kept at 1.16kg/s by controlling the inclination angle of the furnace for smelting and casting the sheet.
In the casting strip-casting process of the ferrozirconium cast sheet, the inclination angle of a smelting and casting sheet furnace is continuously adjusted in the process of outputting the molten raw materials, the first inclination angle is adjusted from 0 degrees to 20 degrees, and the adjustment time is 40 seconds; adjusting the inclination angle for the second time from 20 degrees to 30 degrees for 50s; adjusting the inclination angle for the third time from 30 degrees to 36 degrees for 60s; adjusting the fourth inclination angle from 36 degrees to 42 degrees for 120s; adjusting the fifth inclination angle from 42 degrees to 55 degrees for 150s; the sixth inclination angle is adjusted from 55 degrees to 62 degrees for 150s; the seventh inclination angle is adjusted from 62 degrees to 74 degrees for 155s; the eighth time inclination angle is adjusted from 74 degrees to 82 degrees, and the adjusting time is 150s; the last tilt angle was adjusted from 82 to 90 for 120s.
In the casting strip casting process of the cast sheet of the ferrozirconium, the rotating speed of the casting roller in the fourth step is 63rpm, the diameter of the casting roller is 550-650 mm, a tundish is arranged between the pouring gate and the top of the casting roller, and the shortest distance from the discharge port of the tundish to the surface of the casting roller is 4-6 mm.
In the casting strip casting process of the ferrozirconium cast sheet, the central angle corresponding to the shortest circular arc line between the position of the molten raw material output from the tundish discharge port and the surface of the casting roller and the top of the casting roller is 12-18 degrees.
In the casting strip casting process of the ferrozirconium cast sheet, in the first step, the raw materials are prepared according to the following component proportion by weight: 59 parts of Zr, 3 parts of Hf, and 38 parts of Fe.
In the casting strip-casting process of the ferrozirconium cast sheet, in the second step, air in the sheet-smelting and casting furnace is pumped out to reduce the pressure in the furnace to below 5 Pa.
In the casting strip casting process of the ferrozirconium cast sheet, the protective gas in the third step is argon, and the pressure in a furnace for smelting the cast sheet is maintained at 40KPa after the argon is filled.
In the casting strip-casting process of the ferrozirconium cast sheet, the sheet-melting and casting furnace is a 800 kg vacuum induction melting and casting furnace, and when melting is performed in the third step, the power of the sheet-melting and casting furnace is controlled at 200kW and kept for 10min, the power of the sheet-melting and casting furnace is controlled at 300kW and kept for 10min, the power of the sheet-melting and casting furnace is controlled at 400kW and kept for 10min, the power of the sheet-melting and casting furnace is controlled at 500kW and kept for 15min, and finally the temperature of the melting raw material is kept at 1650 ℃ for 5 min.
Drawings
FIG. 1 is a metallographic structure diagram of a cast piece produced by the process of the present invention in examples.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
Example (b): a casting strip casting process of a ferrozirconium cast sheet comprises the following steps:
step one, preparing raw materials according to the following component proportion by weight: 59 parts of Zr, 3 parts of Hf and 38 parts of Fe.
And step two, mixing the raw materials prepared in the step one, putting the mixture into a 800 kg vacuum induction melting and casting furnace, and pumping air in the melting and casting furnace to reach a vacuum state (the pressure in the furnace is reduced to below 5Pa, which is considered to meet the requirement of the vacuum state).
And step three, filling inert protective gas argon into the smelting and casting sheet furnace, keeping the pressure in the smelting and casting sheet furnace at 40KPa after filling argon, heating and smelting the mixed raw materials under the protective atmosphere of argon, firstly controlling the power of the smelting and casting sheet furnace at 200kW, keeping the power for 10min, then controlling the power of the smelting and casting sheet furnace at 300kW, keeping the power for 10min, then controlling the power of the smelting and casting sheet furnace at 400kW, keeping the power for 10min, then controlling the power of the smelting and casting sheet furnace at 500kW, keeping the power for 15min, and finally keeping the temperature of the molten raw materials at 1650 ℃ for 5 min.
And step four, outputting the molten raw material insulated in the step three from a pouring gate of a sheet smelting and casting furnace, enabling the molten raw material to fall onto a rotating casting roller, and then casting to obtain a cast sheet, wherein the output speed of the raw material in the pouring gate is 1.16kg/s, the rotating speed of the casting roller is 63rpm, the diameter of the casting roller is 600mm, a tundish is arranged between the pouring gate and the top of the casting roller, the shortest distance between a discharge port of the tundish and the surface of the casting roller is 5mm, and the central angle corresponding to the shortest circular arc line between the position of the molten raw material output from the discharge port of the tundish, which is cast onto the surface of the casting roller, and the top of the casting roller is 15 degrees.
In the fourth step, the output speed of the raw materials in the sprue is kept constant at 1.16kg/s by controlling the inclination angle of the melting and casting furnace, the inclination angle of the melting and casting furnace is continuously adjusted in the process of outputting the molten raw materials, the first inclination angle is adjusted from 0 degrees to 20 degrees, and the adjustment time is 40s; adjusting the inclination angle for the second time from 20 degrees to 30 degrees for 50s; adjusting the inclination angle for the third time from 30 degrees to 36 degrees for 60s; adjusting the fourth inclination angle from 36 degrees to 42 degrees for 120s; adjusting the fifth inclination angle from 42 degrees to 55 degrees for 150s; adjusting the inclination angle from 55 degrees to 62 degrees for 150s for the sixth time; the seventh inclination angle is adjusted from 62 degrees to 74 degrees, and the time is adjusted for 155s; the eighth time inclination angle is adjusted from 74 degrees to 82 degrees, and the adjusting time is 150s; the last tilt angle was adjusted from 82 to 90 for 120s.
The metallographic structure of the cast piece obtained by the casting melt-spinning process is shown in figure 1, the thickness of the cast piece is about 1mm, the thickness distribution is uniform, the metallographic structure is clear, and the size of crystal grains is uniform, so that the cast piece meets the manufacturing requirements.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned examples, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (9)
1. A casting melt-spinning process of a ferrozirconium cast sheet is characterized by comprising the following steps:
step one, preparing raw materials according to the following component proportion by weight: 58 to 60 portions of Zr, 2 to 4 portions of Hf, and 38 to 40 portions of Fe;
step two, mixing the raw materials prepared in the step one, putting the mixture into a smelting and casting furnace, and pumping out air in the smelting and casting furnace to reach a vacuum state;
filling inert protective gas into the smelting and casting furnace, heating and smelting the mixed raw materials under the protective atmosphere of the inert protective gas, and preserving the temperature of the smelted molten raw materials at 1600-1700 ℃ for 5 minutes;
and step four, outputting the molten raw material subjected to heat preservation in the step three from a pouring gate of a sheet smelting and casting furnace, enabling the molten raw material to fall on a rotating casting roller, and then carrying out tape throwing to obtain a cast sheet, wherein the output speed of the raw material in the pouring gate is 1.00-1.30 kg/s, and the rotating speed of the casting roller is 60-65 rpm.
2. The casting strip-casting process of the ferrozirconium cast sheet according to claim 1, wherein the casting strip-casting process comprises the following steps: in the fourth step, the output speed of the raw materials in the pouring gate is kept constant at 1.16kg/s by controlling the inclination angle of the melting and casting furnace.
3. The casting strip-casting process of the ferrozirconium cast sheet according to claim 2, wherein: the inclination angle of the smelting and casting furnace is continuously adjusted in the process of outputting the molten raw materials, the first inclination angle is adjusted from 0 degrees to 20 degrees, and the adjustment time is 40s; adjusting the inclination angle for the second time from 20 degrees to 30 degrees for 50s; adjusting the inclination angle for the third time from 30 degrees to 36 degrees for 60s; adjusting the fourth inclination angle from 36 degrees to 42 degrees for 120s; adjusting the fifth inclination angle from 42 degrees to 55 degrees for 150s; the sixth inclination angle is adjusted from 55 degrees to 62 degrees for 150s; the seventh inclination angle is adjusted from 62 degrees to 74 degrees, and the time is adjusted for 155s; the eighth time inclination angle is adjusted from 74 degrees to 82 degrees, and the adjusting time is 150s; the last tilt angle was adjusted from 82 to 90 for 120s.
4. The casting strip-casting process of the ferrozirconium cast sheet according to claim 2, wherein: in the fourth step, the rotating speed of the casting roller is 63rpm, the diameter of the casting roller is 550-650 mm, a tundish is arranged between the pouring gate and the top of the casting roller, and the shortest distance from the discharge port of the tundish to the surface of the casting roller is 4-6 mm.
5. The casting strip-casting process of the ferrozirconium cast sheet according to claim 4, wherein: the central angle corresponding to the shortest circular arc line between the position of the molten raw material output from the tundish discharge port and the surface of the casting roller and the top of the casting roller is 12-18 degrees.
6. The casting strip-casting process of the ferrozirconium cast sheet according to claim 1, wherein the casting strip-casting process comprises the following steps: in the first step, the raw materials are prepared according to the following component proportion by weight: 59 parts of Zr, 3 parts of Hf, and 38 parts of Fe.
7. The casting strip-casting process of the ferrozirconium cast sheet according to claim 1, wherein the casting strip-casting process comprises the following steps: and in the second step, air in the smelting and casting furnace is pumped out, so that the pressure in the furnace is reduced to be less than 5 Pa.
8. The casting strip-casting process of the ferrozirconium cast sheet according to claim 1, wherein the casting strip-casting process comprises the following steps: and in the third step, the protective gas is argon, and the pressure in the smelting and casting furnace is maintained at 40KPa after the argon is filled.
9. The casting strip-casting process of the ferrozirconium cast sheet according to claim 1, wherein the casting strip-casting process comprises the following steps: the smelting and casting furnace is a 800 kg vacuum induction smelting and casting furnace, when smelting is carried out in the third step, the power of the smelting and casting furnace is controlled at 200kW for 10min, then the power of the smelting and casting furnace is controlled at 300kW for 10min, then the power of the smelting and casting furnace is controlled at 400kW for 10min, then the power of the smelting and casting furnace is controlled at 500kW for 15min, and finally the heat of the molten raw materials is preserved for 5min at the temperature of 1650 ℃.
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2021
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