CN112453353A - Preparation process of high-chromium impact type plate hammer - Google Patents
Preparation process of high-chromium impact type plate hammer Download PDFInfo
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- CN112453353A CN112453353A CN202011349104.5A CN202011349104A CN112453353A CN 112453353 A CN112453353 A CN 112453353A CN 202011349104 A CN202011349104 A CN 202011349104A CN 112453353 A CN112453353 A CN 112453353A
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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
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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Abstract
The invention relates to a preparation process of a high-chromium impact type plate hammer, which comprises the following chemical components in percentage by weight: 40-50% of high-chromium cast iron and 50-60% of low-carbon alloy, wherein the low-carbon alloy comprises the following chemical components in percentage by weight: 0.4 to 0.6 percent of C, 4 to 6 percent of Cr, 0.3 to 1.0 percent of Mo, 0.5 to 1.0 percent of Si, 0.5 to 1.0 percent of Mn, less than or equal to 0.05 percent of S, less than or equal to 0.05 percent of P, and the balance of Fe. The combination of the high-chromium cast iron and the low-carbon alloy ensures that the plate hammer has good wear resistance, high hardness, high toughness and other properties, is suitable for the working conditions of crushing of high-impact and high-hardness materials, has more excellent properties compared with the cast iron plate hammer in the prior art, and prolongs the service life of the plate hammer.
Description
Technical Field
The invention relates to the technical field of preparation of a plate hammer, in particular to a preparation process of a high-chromium impact plate hammer.
Background
The plate hammer is a key vulnerable part of the impact crusher, the domestic demand is very large, the plate hammer has very high requirements on the hardness, wear resistance, toughness and other properties of the plate hammer, the plate hammer produced in China at present has good toughness, but the wear resistance is poor, so the service life of the plate hammer can be shortened, in addition, most of the existing high-chromium plate hammers are produced by using an intermediate frequency furnace for smelting, impurities in molten iron are difficult to remove, and the wear resistance is greatly reduced; and the plate hammer is thicker (90-260 mm), so that the defects of larger difference of hardness between the core part and the surface, coarse crystal grains, inclusion, slag inclusion and the like are caused, and the mechanical property of the plate hammer is seriously influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation process of a high-chromium impact type plate hammer.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation process of a high-chromium impact type plate hammer comprises the following chemical components in percentage by weight: 40-50% of high-chromium cast iron and 50-60% of low-carbon alloy, wherein the low-carbon alloy comprises the following chemical components in percentage by weight: 0.4 to 0.6 percent of C, 4 to 6 percent of Cr, 0.3 to 1.0 percent of Mo, 0.5 to 1.0 percent of Si, 0.5 to 1.0 percent of Mn, less than or equal to 0.05 percent of S, less than or equal to 0.05 percent of P, and the balance of Fe, wherein the specific preparation process steps of the high-chromium alloy plate hammer are as follows:
A. preparing high-chromium cast iron and low-carbon alloy, and preparing preparation equipment required in the process, wherein the preparation equipment comprises a high-temperature electric furnace, a sand mold, heat treatment equipment and cooling equipment;
B. determining a pouring process according to a drawing of a board hammer, and manufacturing a wood pattern; determining a proper sand box; preparing a pouring gate, a riser and a foamed ceramic filter screen;
C. placing a wood pattern in a sand box, placing a pouring gate and a riser according to the process requirements, then filling molding sand between the surface of the wood pattern and the sand box, tamping to form a sand mold, blowing carbon dioxide gas into the sand mold to harden the sand mold, finally taking out the wood pattern to obtain a hollow sand mold, then brushing the surface of the manufactured sand mold with coating twice, and cleaning a cavity; placing the internal chill in a cavity of the lower box and firmly fixing; placing external chill close to the cavity; placing a foamed ceramic filter screen in the pouring channel; after the inspection is finished, the upper box is combined on the lower box and is tightly locked;
D. respectively heating the high-chromium cast iron and the low-carbon alloy by a high-temperature electric furnace until the high-chromium cast iron and the low-carbon alloy are in a molten state, wherein the heating and melting temperature is 1400-1550 ℃;
E. pouring high-chromium cast iron and low-carbon alloy in a molten state in a box closing manner, pouring the high-chromium cast iron through a first pouring port, wherein the pouring temperature is 1440-1470 ℃, when the high-chromium cast iron is visible through a first observation hole, stopping pouring, pouring a low-carbon alloy solution through a second pouring port after 16-24 seconds, the pouring temperature is 1510-1540 ℃, when the low-carbon alloy solution is visible through a second observation hole, stopping pouring, and pouring the high-chromium cast iron solution through a third pouring port after 16-24 seconds, wherein the pouring temperature is 1420-1440 ℃;
F. and cooling the successfully poured plate hammer casting, unpacking, cleaning, cutting off a casting head, a riser and a flash, and finally sequentially quenching, tempering and cooling the plate hammer casting to obtain a finished product.
In a further preferred mode, the high-temperature electric furnace in the step D is used for analyzing the front of the furnace by a spectrum analyzer before the high-chromium cast iron and the low-carbon alloy are discharged, so that qualified high-chromium cast iron and low-carbon alloy solution is obtained.
In a further preferred mode, before the tempering treatment in the step F, rapid air-cooling normalizing is performed by air-cooling normalizing in a standing, blowing or spraying manner.
In a further preferred mode, the tempered treatment at 350-500 ℃ is carried out on the normalized plate hammer in a high-temperature tempering furnace in the step F.
In a further preferred embodiment, the tempering time in step F is 3 to 5 hours.
In the tempering treatment in the step F, the error of the quenching and tempering temperature is preferably controlled to be plus or minus twenty degrees, and the tempering atmosphere is preferably air.
Preferably, the quenching treatment in the step F is to heat to 150 ℃ and keep the temperature for 1 hour, heat to 300 ℃ and keep the temperature for 1 hour, heat to 500 ℃ and keep the temperature for 1 hour, heat to 700 ℃ and keep the temperature for 1 hour, and finally heat to 980 ℃ and keep the temperature for 2-4 hours.
In a further preferred embodiment, the negative pressure of the sand mold is 0.03 to 0.05 MPa.
In a further preferred mode, the molding sand is quartz sand mixed by water glass with the mass fraction of 6%.
Compared with the prior art, the invention has the following beneficial effects:
the high-chromium cast iron and the low-carbon alloy are matched, so that the plate hammer has the performances of good wear resistance, high hardness, high toughness and the like, is suitable for working conditions of high impact and high hardness material crushing, has more excellent performance compared with the plate hammer made of cast iron in the prior art, prolongs the service life of the plate hammer, has the advantages of simple preparation process, easy realization and strong practicability, effectively solves the defects of the process in the prior art, such as air holes, sand holes, shrinkage cavities, shrinkage porosity and the like in the production process of the plate hammer, improves the preparation efficiency, and is convenient for workers to use.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
a preparation process of a high-chromium impact type plate hammer comprises the following chemical components in percentage by weight: 40-50% of high-chromium cast iron and 50-60% of low-carbon alloy, wherein the low-carbon alloy comprises the following chemical components in percentage by weight: 0.4 to 0.6 percent of C, 4 to 6 percent of Cr, 0.3 to 1.0 percent of Mo, 0.5 to 1.0 percent of Si, 0.5 to 1.0 percent of Mn, less than or equal to 0.05 percent of S, less than or equal to 0.05 percent of P, and the balance of Fe, wherein the specific preparation process steps of the high-chromium alloy plate hammer are as follows:
A. preparing high-chromium cast iron and low-carbon alloy, and preparing preparation equipment required in the process, wherein the preparation equipment comprises a high-temperature electric furnace, a sand mold, heat treatment equipment and cooling equipment;
B. determining a pouring process according to a drawing of a board hammer, and manufacturing a wood pattern; determining a proper sand box; preparing a pouring gate, a riser and a foamed ceramic filter screen;
C. placing a wood pattern in a sand box, placing a pouring gate and a riser according to the process requirements, then filling molding sand between the surface of the wood pattern and the sand box, tamping to form a sand mold, blowing carbon dioxide gas into the sand mold to harden the sand mold, finally taking out the wood pattern to obtain a hollow sand mold, then brushing the surface of the manufactured sand mold with coating twice, and cleaning a cavity; placing the internal chill in a cavity of the lower box and firmly fixing; placing external chill close to the cavity; placing a foamed ceramic filter screen in the pouring channel; after the inspection is finished, the upper box is combined on the lower box and is tightly locked;
D. respectively heating the high-chromium cast iron and the low-carbon alloy by a high-temperature electric furnace until the high-chromium cast iron and the low-carbon alloy are in a molten state, wherein the heating and melting temperature is 1400-1550 ℃;
E. pouring high-chromium cast iron and low-carbon alloy in a molten state in a box closing manner, pouring the high-chromium cast iron through a first pouring port, wherein the pouring temperature is 1440-1470 ℃, when the high-chromium cast iron is visible through a first observation hole, stopping pouring, pouring a low-carbon alloy solution through a second pouring port after 16-24 seconds, the pouring temperature is 1510-1540 ℃, when the low-carbon alloy solution is visible through a second observation hole, stopping pouring, and pouring the high-chromium cast iron solution through a third pouring port after 16-24 seconds, wherein the pouring temperature is 1420-1440 ℃;
F. and cooling the successfully poured plate hammer casting, unpacking, cleaning, cutting off a casting head, a riser and a flash, and finally sequentially quenching, tempering and cooling the plate hammer casting to obtain a finished product.
In this embodiment, the high temperature electric furnace in step D analyzes the front of the furnace by a spectrum analyzer before discharging the high chromium cast iron and the low carbon alloy, so as to obtain a qualified high chromium cast iron and low carbon alloy solution. The melted solution can be well detected by a spectrum analyzer so as to avoid the situation of unqualified melting.
In this embodiment, before the tempering treatment in step F, the air-cooling normalization is performed rapidly by standing, blowing or spraying. So that the tempering treatment can be performed better.
In this embodiment, in the step F, the normalized plate hammer is tempered at 500 ℃ in a high-temperature tempering furnace at 350-. Further improving the tempering treatment effect of the plate hammer.
In this embodiment, the tempering time in step F is 3 to 5 hours. Further improving the tempering treatment effect of the plate hammer piece and making a cushion for the subsequent working procedures.
In this embodiment, during the tempering in step F, the error of the quenching and tempering temperature is controlled to be plus or minus twenty degrees, and the tempering atmosphere is air. Further creates conditions for tempering and improves the tempering effect.
In this embodiment, the quenching treatment in step F includes first heating to 150 ℃ and maintaining the temperature for 1 hour, then heating to 300 ℃ and maintaining the temperature for 1 hour, then heating to 500 ℃ and maintaining the temperature for 1 hour, then heating to 700 ℃ and maintaining the temperature for 1 hour, and finally heating to 980 ℃ and maintaining the temperature for 2-4 hours. Through quenching treatment, the plate hammer is more stable, and the purpose of primary cooling can be achieved.
In this embodiment, the negative pressure of the sand mold is 0.03 to 0.05 MPa. In this negative pressure state, the casting work can be performed well.
In this example, the molding sand is quartz sand mixed with water glass with a mass fraction of 6%. The pouring effect of the plate hammer is improved.
Example 2:
the high-chromium alloy plate hammer is prepared by the following specific steps:
A. preparing high-chromium cast iron and low-carbon alloy, wherein the high-chromium alloy plate hammer comprises the following chemical components in percentage by weight: 40% of high-chromium cast iron and 60% of low-carbon alloy, wherein the low-carbon alloy comprises the following chemical components in percentage by weight: 0.4% of C, 4% of Cr, 0.3% of Mo, 0.5% of Si, 0.5% of Mn, 0.05% of S, 0.05% of P and 0.2% of Fe94.2%, and simultaneously preparing preparation equipment required in the process, wherein the preparation equipment comprises a high-temperature electric furnace, a sand mold, heat treatment equipment and cooling equipment;
B. determining a pouring process according to a drawing of a board hammer, and manufacturing a wood pattern; determining a proper sand box; preparing a pouring gate, a riser and a foamed ceramic filter screen;
C. placing a wood pattern in a sand box, placing a pouring gate and a riser according to the process requirements, then filling molding sand between the surface of the wood pattern and the sand box, tamping to form a sand mold, blowing carbon dioxide gas into the sand mold to harden the sand mold, finally taking out the wood pattern to obtain a hollow sand mold, then brushing the surface of the manufactured sand mold with coating twice, and cleaning a cavity; placing the internal chill in a cavity of the lower box and firmly fixing; placing external chill close to the cavity; placing a foamed ceramic filter screen in the pouring channel; after the inspection is finished, the upper box is combined on the lower box and is tightly locked;
D. respectively heating the high-chromium cast iron and the low-carbon alloy by a high-temperature electric furnace until the high-chromium cast iron and the low-carbon alloy are in a molten state, wherein the heating and melting temperature is 1400 ℃;
E. pouring high-chromium cast iron and low-carbon alloy in a molten state in a mould assembling manner, pouring the high-chromium cast iron through a first pouring gate, wherein the pouring temperature is 1440 ℃, when the high-chromium cast iron is visible through a first observation hole, stopping pouring, pouring a low-carbon alloy solution through a second pouring gate after 1 second, the pouring temperature is 1510 ℃, when the low-carbon alloy solution is visible through a second observation hole, stopping pouring, and pouring the high-chromium cast iron solution through a third pouring gate after 16 seconds, wherein the pouring temperature is 1420 ℃;
F. and then cooling the successfully poured plate hammer casting, unpacking, cleaning, cutting off a casting head, a riser and a flash, and finally quenching, tempering and cooling the plate hammer casting in sequence to obtain a finished product, wherein the quenching treatment comprises the steps of firstly heating to 150 ℃ and keeping the temperature for 1h, then heating to 300 ℃ and keeping the temperature for 1h, then heating to 500 ℃ and keeping the temperature for 1h, then heating to 700 ℃ and keeping the temperature for 1h, finally heating to 980 ℃ and keeping the temperature for 2-4h, carrying out tempering treatment at 350 ℃ in a tempering furnace for 3 hours, and finally cooling to obtain the finished product.
Example 3:
the high-chromium alloy plate hammer is prepared by the following specific steps:
A. preparing high-chromium cast iron and low-carbon alloy, wherein the high-chromium alloy plate hammer comprises the following chemical components in percentage by weight: 50% of high-chromium cast iron and 50% of low-carbon alloy, wherein the low-carbon alloy comprises the following chemical components in percentage by weight: 0.6% of C, 6% of Cr, 1.0% of Mo1, 1.0% of Si, 1.0% of Mn, 0.05% of S, 0.05% of P and 90.3% of FeC, and preparing preparation equipment required in the process, wherein the preparation equipment comprises a high-temperature electric furnace, a sand mold, heat treatment equipment and cooling equipment;
B. determining a pouring process according to a drawing of a board hammer, and manufacturing a wood pattern; determining a proper sand box; preparing a pouring gate, a riser and a foamed ceramic filter screen;
C. placing a wood pattern in a sand box, placing a pouring gate and a riser according to the process requirements, then filling molding sand between the surface of the wood pattern and the sand box, tamping to form a sand mold, blowing carbon dioxide gas into the sand mold to harden the sand mold, finally taking out the wood pattern to obtain a hollow sand mold, then brushing the surface of the manufactured sand mold with coating twice, and cleaning a cavity; placing the internal chill in a cavity of the lower box and firmly fixing; placing external chill close to the cavity; placing a foamed ceramic filter screen in the pouring channel; after the inspection is finished, the upper box is combined on the lower box and is tightly locked;
D. respectively heating high-chromium cast iron and low-carbon alloy by a high-temperature electric furnace until the high-chromium cast iron and the low-carbon alloy are in a molten state, wherein the heating and melting temperature is 1550 ℃;
E. pouring high-chromium cast iron and low-carbon alloy in a molten state in a mould assembling manner, pouring the high-chromium cast iron through a first pouring gate, wherein the pouring temperature is 1470 ℃, pouring is stopped when the high-chromium cast iron is visible through a first observation hole, pouring a low-carbon alloy solution through a second pouring gate after 24 seconds, the pouring temperature is 1540 ℃, pouring is stopped when the low-carbon alloy solution is visible through a second observation hole, and pouring the high-chromium cast iron solution through a third pouring gate after 24 seconds, wherein the pouring temperature is 1440 ℃;
F. and then cooling the successfully poured plate hammer casting, unpacking, cleaning, cutting off a casting head, a riser and a flash, and finally quenching, tempering and cooling the plate hammer casting in sequence to obtain a finished product, wherein the quenching treatment comprises the steps of firstly heating to 150 ℃ and keeping the temperature for 1h, then heating to 300 ℃ and keeping the temperature for 1h, then heating to 500 ℃ and keeping the temperature for 1h, then heating to 700 ℃ and keeping the temperature for 1h, finally heating to 980 ℃ and keeping the temperature for 2-4h, carrying out tempering treatment at 350 ℃ in a tempering furnace for 3 hours, and finally cooling to obtain the finished product.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A preparation process of a high-chromium impact type plate hammer comprises a high-chromium alloy plate hammer and is characterized in that the high-chromium alloy plate hammer comprises the following chemical components in percentage by weight: 40-50% of high-chromium cast iron and 50-60% of low-carbon alloy, wherein the low-carbon alloy comprises the following chemical components in percentage by weight: 0.4 to 0.6 percent of C, 4 to 6 percent of Cr, 0.3 to 1.0 percent of Mo, 0.5 to 1.0 percent of Si, 0.5 to 1.0 percent of Mn, less than or equal to 0.05 percent of S, less than or equal to 0.05 percent of P, and the balance of Fe, wherein the specific preparation process steps of the high-chromium alloy plate hammer are as follows:
A. preparing high-chromium cast iron and low-carbon alloy, and preparing preparation equipment required in the process, wherein the preparation equipment comprises a high-temperature electric furnace, a sand mold, heat treatment equipment and cooling equipment;
B. determining a pouring process according to a drawing of a board hammer, and manufacturing a wood pattern; determining a proper sand box; preparing a pouring gate, a riser and a foamed ceramic filter screen;
C. placing a wood pattern in a sand box, placing a pouring gate and a riser according to the process requirements, then filling molding sand between the surface of the wood pattern and the sand box, tamping to form a sand mold, blowing carbon dioxide gas into the sand mold to harden the sand mold, finally taking out the wood pattern to obtain a hollow sand mold, then brushing the surface of the manufactured sand mold with coating twice, and cleaning a cavity; placing the internal chill in a cavity of the lower box and firmly fixing; placing external chill close to the cavity; placing a foamed ceramic filter screen in the pouring channel; after the inspection is finished, the upper box is combined on the lower box and is tightly locked;
D. respectively heating the high-chromium cast iron and the low-carbon alloy by a high-temperature electric furnace until the high-chromium cast iron and the low-carbon alloy are in a molten state, wherein the heating and melting temperature is 1400-1550 ℃;
E. pouring high-chromium cast iron and low-carbon alloy in a molten state in a box closing manner, pouring the high-chromium cast iron through a first pouring port, wherein the pouring temperature is 1440-1470 ℃, when the high-chromium cast iron is visible through a first observation hole, stopping pouring, pouring a low-carbon alloy solution through a second pouring port after 16-24 seconds, the pouring temperature is 1510-1540 ℃, when the low-carbon alloy solution is visible through a second observation hole, stopping pouring, and pouring the high-chromium cast iron solution through a third pouring port after 16-24 seconds, wherein the pouring temperature is 1420-1440 ℃;
F. and cooling the successfully poured plate hammer casting, unpacking, cleaning, cutting off a casting head, a riser and a flash, and finally sequentially quenching, tempering and cooling the plate hammer casting to obtain a finished product.
2. The preparation process of the high-chromium impact plate hammer according to claim 1, which is characterized in that: and D, analyzing the front of the high-temperature electric furnace in the step D by a spectrum analyzer before the high-chromium cast iron and the low-carbon alloy are discharged, so as to obtain qualified high-chromium cast iron and low-carbon alloy solution.
3. The preparation process of the high-chromium impact plate hammer according to claim 2, characterized in that: and D, before the tempering treatment in the step F, quickly air-cooling normalizing is carried out by adopting an air-cooling normalizing mode as a standing, blowing or spraying mode.
4. The preparation process of the high-chromium impact plate hammer according to claim 3, characterized by comprising the following steps: in the step F, the normalized plate hammer is tempered at the temperature of 350-500 ℃ in a high-temperature tempering furnace.
5. The preparation process of the high-chromium impact plate hammer according to claim 4, wherein the preparation process comprises the following steps: and F, tempering for 3-5 hours.
6. The preparation process of the high-chromium impact plate hammer according to claim 5, wherein the preparation process comprises the following steps: and F, controlling the quenching and tempering temperature error to be plus or minus twenty degrees during tempering treatment in the step F, wherein the tempering atmosphere is air.
7. The preparation process of the high-chromium impact plate hammer according to claim 1, which is characterized in that: and the quenching treatment in the step F comprises the steps of firstly heating to 150 ℃ and keeping the temperature constant for 1h, then heating to 300 ℃ and keeping the temperature constant for 1h, then heating to 500 ℃ and keeping the temperature constant for 1h, then heating to 700 ℃ and keeping the temperature constant for 1h, and finally heating to 980 ℃ and keeping the temperature constant for 2-4 h.
8. The preparation process of the high-chromium impact plate hammer according to claim 1, which is characterized in that: the negative pressure of the sand mold is 0.03-0.05 MPa.
9. The preparation process of the high-chromium impact plate hammer according to claim 1, which is characterized in that: the molding sand is quartz sand mixed by water glass with the mass fraction of 6%.
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| CN104690231A (en) * | 2015-02-15 | 2015-06-10 | 广东省工业技术研究院(广州有色金属研究院) | Preparation method of composite board hammer |
| CN105132792A (en) * | 2015-08-10 | 2015-12-09 | 霍邱县忠振耐磨材料有限公司 | High-chromium high-tungsten wear-resisting cast iron plate hammer of crusher and preparation method thereof |
| CN105107576A (en) * | 2015-09-18 | 2015-12-02 | 中建材（合肥）水泥通用设备科技有限公司 | Impact crusher plate hammer and manufacturing method thereof |
| CN105562601A (en) * | 2015-12-21 | 2016-05-11 | 湖北金阳石新型耐磨材料科技有限公司 | Method for preparing high-chromium plate hammer of impact crusher |
| CN109663900A (en) * | 2018-12-26 | 2019-04-23 | 广东越科新材料有限公司 | A kind of steel-based composite plate hammer and preparation method thereof |
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