CN112034905B - Automatic temperature rise control method for medium-frequency induction smelting of neodymium iron boron melt - Google Patents
Automatic temperature rise control method for medium-frequency induction smelting of neodymium iron boron melt Download PDFInfo
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- CN112034905B CN112034905B CN202010848193.1A CN202010848193A CN112034905B CN 112034905 B CN112034905 B CN 112034905B CN 202010848193 A CN202010848193 A CN 202010848193A CN 112034905 B CN112034905 B CN 112034905B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
- G05D23/32—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature with provision for adjustment of the effect of the auxiliary heating device, e.g. a function of time
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Abstract
The invention discloses an automatic temperature rise control method for medium-frequency induction smelting of neodymium iron boron melt, which is characterized in that the initial set power is A0, the improved set power is A1, the incremental power is B, the power difference is C, and the actual output power is D, the set power is adjusted to be the initial set power A0, the output power D is gradually increased, when A0-D is less than C, the set power A1 is increased to be A0+ B, wherein the incremental power B is more than or equal to the power difference C. The invention has the advantages that: the set power is improved in real time, and the power output is ensured to be close to the maximum value, so that the metal smelting time is shortened, and the energy consumption and the loss and oxidation risk of volatile materials are reduced.
Description
Technical Field
The invention relates to an automatic temperature rise control method for medium-frequency induction smelting of neodymium iron boron melt.
Background
The medium frequency induction furnace is used for smelting raw materials such as Fe and Co with certain hysteresis effect, and the initial output power is less than the set power when the temperature is lower. At the moment, the set power is too high, the output power is low, and the load of components of the power supply cabinet is too large, so that the service life is influenced. Generally, the power is increased step by step at regular time by adopting sectional setting; in a certain power heat preservation specific time project, the set power is smaller than the output power, so that the heating efficiency is reduced.
Disclosure of Invention
The invention aims to provide an automatic temperature rise control method for medium-frequency induction smelting of neodymium iron boron melt, which can effectively solve the problem of low heating efficiency caused by poor control of medium-frequency induction heating power of the existing neodymium iron boron melt.
In order to solve the technical problems, the invention is realized by the following technical scheme: an automatic temperature rise control method for medium-frequency induction smelting of neodymium iron boron melt comprises the steps of initially setting power A0, increasing the set power A1, increasing the incremental power B, the power difference C and the actual output power D, firstly adjusting the set power A0 to the initially set power, gradually increasing the output power D, and increasing the set power A1 to A0+ B when A0-D is smaller than C, wherein the increasing power B is larger than or equal to the power difference C.
Preferably, the incremental power B is 0-60 kW.
Preferably, the incremental power B is 5-20 kW.
Preferably, the power difference C is 0-30 kW.
Preferably, the power difference C is 5-15 kW.
Compared with the prior art, the invention has the advantages that: the set power is improved in real time, and the power output is ensured to be close to the maximum value, so that the metal smelting time is shortened, and the energy consumption and the loss and oxidation risk of volatile materials are reduced.
Detailed Description
The following detailed description of the embodiments of the present invention is intended to be illustrative, and not to be construed as limiting the invention.
An automatic temperature rise control method for medium-frequency induction smelting of neodymium iron boron melt comprises the steps of initially setting power A0, increasing the set power A1, increasing the incremental power B, the power difference C and the actual output power D, firstly adjusting the set power A0 to the initially set power, gradually increasing the output power D, and increasing the set power A1 to A0+ B when A0-D is smaller than C, wherein the increasing power B is larger than or equal to the power difference C.
For the crucible with the total output power of 200-2000 kW, the incremental power B is generally 0-60 kW, the power difference C is generally 0-30 kW, preferably the incremental power B is 5-20 kW, and the power difference C is 5-15 kW. The metal smelting time can be shortened as short as possible, and the optimal output power is ensured.
The preparation process of the raw materials comprises: nd75Pr25 with a purity of 99.5%, pure Dy with a purity of 99.5%, industrial Fe-B, industrial pure Fe, Cu, Al, Co with a purity of 99.5%, Ga with a purity of 99.9%, and Zr with a purity of 99.2% were prepared at atomic%. The contents of the elements are shown in table 1:
| NdPr | Dy | Fe | Co | Cu | Al | Ga | Zr | B |
| 30.90 | 1.00 | balance of | 1.20 | 0.12 | 0.30 | 0.20 | 0.12 | 0.97 |
TABLE 1
Taking 1 part of prepared raw materials each time, putting the raw materials into a crucible made of alumina, smelting in a vacuum induction smelting furnace, refining at 1500 ℃ for 5min, then adjusting heating power to realize cooling, detecting the temperature of molten liquid by using a temperature measuring device, casting by using a single-roll quenching method when the target temperature is reached to 1420 ℃, obtaining a melt spinning piece, continuously smelting for 10 times, and calculating average power consumption and smelting time.
The control method of the invention is adopted to initially set the power A0 as 100W, the incremental power B as 10kW and the power difference C as 5kW, and the power output is improved according to the control method of the invention.
Comparative example 1, with direct addition of power to 500 kW.
Comparative example 2, the melting temperature-raising power method adopted was: 100kw, 5 min; 150kw, 5 minutes; 200kw, 10 min; 300kw, 5 minutes; 400kw for 5 min; 500kw, 5 min.
The final melting time and power consumption are shown in table 2:
TABLE 2
Through the comparison, the temperature rise control method can improve the set power in real time and ensure that the power output is close to the maximum value, thereby shortening the metal smelting time and reducing the energy consumption and the loss and the oxidation risk of volatile materials.
The above description is only an embodiment of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications within the technical field of the present invention by those skilled in the art are covered by the claims of the present invention.
Claims (5)
1. An automatic temperature rise control method for medium-frequency induction smelting of molten neodymium iron boron is characterized by comprising the following steps: the method comprises the steps of initially setting the power to be A0, increasing the set power to be A1, increasing the power to be B, setting the power difference to be C and actually outputting the power to be D, firstly adjusting the set power to be A0, gradually increasing the output power D, and increasing the set power A1 to be A0+ B when A0-D is less than C, wherein the increasing power B is more than or equal to the power difference C.
2. The automatic temperature rise control method for medium-frequency induction smelting of neodymium iron boron melt as claimed in claim 1, characterized in that: the incremental power B is 0-60 kW.
3. The automatic temperature rise control method for medium-frequency induction smelting of neodymium iron boron melt as claimed in claim 2, characterized in that: the incremental power B is 5-20 kW.
4. The automatic temperature rise control method for medium-frequency induction smelting of neodymium iron boron melt as claimed in claim 1, characterized in that: the power difference C is 0-30 kW.
5. The automatic temperature rise control method for medium-frequency induction smelting of neodymium iron boron melt as claimed in claim 4, characterized in that: the power difference C is 5-15 kW.
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