CN114438287A - Automatic quenching and tempering double heat treatment method for automobile lock shell - Google Patents

Automatic quenching and tempering double heat treatment method for automobile lock shell Download PDF

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Publication number
CN114438287A
CN114438287A CN202011232376.7A CN202011232376A CN114438287A CN 114438287 A CN114438287 A CN 114438287A CN 202011232376 A CN202011232376 A CN 202011232376A CN 114438287 A CN114438287 A CN 114438287A
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China
Prior art keywords
quenching
tempering
temperature
parts
putting
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CN202011232376.7A
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Chinese (zh)
Inventor
陆奇辉
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Hubei Huiwang Electromechanical Co ltd
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Hubei Huiwang Electromechanical Co ltd
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Priority to CN202011232376.7A priority Critical patent/CN114438287A/en
Publication of CN114438287A publication Critical patent/CN114438287A/en
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Classifications

    • 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
    • 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
    • C21D1/78—Combined heat-treatments not provided for above
    • 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
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite

Abstract

The invention discloses an automatic quenching and tempering double heat treatment method for an automobile lock shell, which comprises the following steps: processing the raw materials into a material with uniform thickness and uniform hardness, putting the material into a container, pouring a cleaning agent until the material is completely soaked in the cleaning agent, taking out the material, washing the material with clear water, and drying the material for later use; putting the material into a quenching furnace for quenching treatment, and continuously stirring; taking out the quenched material and putting the quenched material into a first quenching oil tank for oil cooling; taking out and putting the steel plate into a second quenching oil tank for oil cooling; after the material is taken out, spraying a waterproof coating and an anticorrosive coating on the surface of the material, and drying the material by using hot air after spraying; and (3) putting the material into a tempering furnace for tempering twice, and then cooling the material to room temperature. The three times of quenching treatment can reduce the oxidation and decarburization of the surface of the material, and can ensure that the gas in the furnace is fully combusted and the heating temperature is uniform.

Description

Automatic quenching and tempering double heat treatment method for automobile lock shell
Technical Field
The invention belongs to the technical field of forging, and particularly relates to an automatic quenching and tempering double heat treatment method for an automobile lock shell.
Background
In the production process of the forging, the heat treatment quality of the material directly influences the subsequent processing quality, efficiency, use performance and service life of the material. The automobile lock shell is used as a safety part and has high requirements on the raw material component proportion of the material, the control of trace elements, the material performance after heat treatment, the metallographic structure requirement, the surface hardness, the toughness, the strength and the processing performance, the shape of the lock shell is complex, the phenomena of local position hardening crack and uneven surface hardness exist in different degrees in the heat treatment of the material in the industry, the phenomenon belongs to an undeterminable factor and causes adverse effects on subsequent processing and use, the identification and inspection work of the material quality is complicated, the identification reject ratio is high, and the quality cost and the production cost are high. In view of the above, there is a need for an improved method of heat treating a conventional lock housing of an automobile.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an automatic quenching and tempering double heat treatment method for an automobile lock shell, which can further improve the heat treatment quality.
In order to achieve the above object, the present invention adopts the following technical solutions:
the automatic quenching and tempering double heat treatment method for the automobile lock shell comprises the following steps:
step one, processing raw materials into materials with uniform thickness and uniform hardness, putting the materials into a container, pouring a cleaning agent until the materials are completely soaked in the cleaning agent, continuously stirring for 1-2 hours, taking out the materials, washing the materials with clear water, and drying the materials for later use;
secondly, putting the material into a quenching furnace for quenching treatment, continuously stirring at the stirring speed of 400-580 revolutions per minute, slowly raising the temperature of the quenching furnace to 580-650 ℃, preserving the heat for 20-25 min, and carrying out primary quenching treatment; slowly raising the temperature of the quenching furnace to 650-900 ℃, preserving the heat for 1.0-2.8 hours, and carrying out secondary quenching treatment; slowly raising the temperature of the quenching furnace to 880-950 ℃, preserving the heat for 2.5-4 hours, and carrying out quenching treatment for the third time;
taking out the quenched material, putting the quenched material into a first quenching oil tank for oil cooling, and continuously stirring for 35-50 min; taking out the mixture, putting the mixture into a second quenching oil tank for oil cooling, and continuously stirring for 1.2-1.5 h;
after the material is taken out, spraying a waterproof coating and an anticorrosive coating on the surface of the material, and drying the material by using hot air after spraying;
and fifthly, putting the material into a tempering furnace for tempering twice, and then cooling the material to room temperature.
Preferably, in the step one, the cleaning agent comprises the following components in parts by mass: 15-26 parts of diacetic acid, 20-23 parts of citric acid, 12-23 parts of tetrafluoroboric acid, 16-24 parts of chlorinated 1-methyl-3-ethylimidazole, 18-27 parts of n-dodecane, 4-12 parts of triethanolamine oleate salt, 13-16 parts of sodium sulfate and 22-28 parts of water.
Preferably, in the step one, the temperature of the container is increased to 45-60 ℃.
More preferably, in the step one, the material is dried and then sent into a dephosphorization tank for dephosphorization treatment, and the dephosphorization solution in the dephosphorization tank is 2.8-4.5 g/L potassium hydroxide solution or 2.1-5.5 g/L sodium hydroxide solution.
Further preferably, in the second step, the temperature rise rate of the quenching furnace is 80 to 110 ℃/min.
Specifically, in the third step of the previous step, the temperature of the quenching oil in the first quenching oil tank is 380-450 ℃, and the temperature of the quenching oil in the second quenching oil tank is 80-90 ℃.
Preferably, in the fourth step, the temperature of the hot air is 75-80 ℃.
Preferably, in the fifth step, the tempering temperature of the first tempering treatment is 150 to 170 ℃, and the tempering time is 2 to 3.5 hours.
More preferably, in the fifth step, the temperature of the second tempering is raised to 280-340 ℃, and the tempering time is 3.5-5.5 hours.
The invention has the advantages that:
(1) the third quenching treatment can reduce the oxidation and decarburization of the surface of the material, can also ensure that the gas in the furnace is fully combusted, has uniform heating temperature, can ensure that austenite is uniformly formed in controllable time, and can completely dissolve ferrite;
(2) before heat treatment, the material is subjected to rust removal cleaning treatment by using cleaning liquid, and the material is subjected to scale removal treatment, so that the quenching effect can be prevented from being influenced by impurities on the outer surface of the material, and the quality of heat treatment is further improved;
(3) the cooling speed of the material is improved by the two times of oil cooling treatment, the surface hardness of the cooled material is more uniform, and the local soft spot condition is avoided.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
Example 1
The automatic quenching and tempering double heat treatment method for the automobile lock shell comprises the following steps:
step one, processing raw materials into materials with uniform thickness and uniform hardness, putting the materials into a container, pouring a cleaning agent until the materials are completely soaked in the cleaning agent, raising the temperature of the container to 45 ℃, continuously stirring for 1h, taking out the materials, washing the materials with clear water, drying the materials, sending the dried materials into a phosphorus removal tank for carrying out scale removal treatment, wherein a phosphorus removal solution in the phosphorus removal tank is a potassium hydroxide solution with the concentration of 2.8 g/L; the cleaning agent comprises the following components in parts by mass: 15 parts of diacetic acid, 20 parts of citric acid, 12 parts of tetrafluoroboric acid, 16 parts of chlorinated 1-methyl-3-ethylimidazole, 18 parts of n-dodecane, 4 parts of triethanolamine oleate salt, 13 parts of sodium sulfate and 22 parts of water;
secondly, putting the material into a quenching furnace for quenching treatment, and continuously stirring, wherein the stirring speed is 500 r/min, the heating rate of the quenching furnace is 80 ℃/min, slowly heating the temperature of the quenching furnace to 590 ℃, and keeping the temperature for 22min for primary quenching treatment; slowly raising the temperature of the quenching furnace to 700 ℃, preserving the heat for 1.2 hours, and carrying out secondary quenching treatment; slowly raising the temperature of the quenching furnace to 880 ℃, preserving the heat for 2.3 hours, and carrying out quenching treatment for the third time;
taking out the quenched material, putting the quenched material into a first quenching oil tank for oil cooling, wherein the temperature of quenching oil in the first quenching oil tank is 380 ℃, and continuously stirring for 35 min; taking out, putting into a second quenching oil tank for oil cooling, wherein the temperature of quenching oil in the second quenching oil tank is 80 ℃, and continuously stirring for 1.2 h;
step four, after the material is taken out, spraying a waterproof coating and an anticorrosive coating on the surface of the material, and drying the material by using hot air after spraying, wherein the temperature of the hot air is 75 ℃;
and fifthly, putting the material into a tempering furnace for tempering twice, wherein the tempering temperature of the first tempering is 150 ℃, the tempering time is 2 hours, the temperature rise of the second tempering is 280 ℃, and the tempering time is 3.5 hours, and then cooling the material to room temperature.
Example 2
The automatic quenching and tempering double heat treatment method for the automobile lock shell comprises the following steps:
step one, processing raw materials into materials with uniform thickness and uniform hardness, putting the materials into a container, pouring a cleaning agent until the materials are completely soaked in the cleaning agent, raising the temperature of the container to 60 ℃, continuously stirring for 1.5h, taking out the materials, washing the materials with clear water, drying the materials, sending the materials into a dephosphorization tank for descaling, wherein the dephosphorization solution in the dephosphorization tank is 4.5g/L potassium hydroxide solution or 5.5g/L sodium hydroxide solution; the cleaning agent comprises the following components in parts by mass: 26 parts of diacetic acid, 23 parts of citric acid, 23 parts of tetrafluoroboric acid, 24 parts of 1-methyl-3-ethylimidazole chloride, 27 parts of n-dodecane, 12 parts of triethanolamine oleate salt, 16 parts of sodium sulfate and 28 parts of water;
step two, putting the material into a quenching furnace for quenching treatment, and continuously stirring at the stirring speed of 600 revolutions per minute and the heating rate of the quenching furnace of 110 degrees per minute, slowly heating the temperature of the quenching furnace to 700 ℃, and keeping the temperature for 28 minutes for carrying out primary quenching treatment; slowly raising the temperature of the quenching furnace to 850 ℃, preserving the heat for 2.5 hours, and carrying out secondary quenching treatment; slowly raising the temperature of the quenching furnace to 950 ℃, and preserving the temperature for 3.8 hours to carry out third quenching treatment;
taking out the quenched material, putting the quenched material into a first quenching oil tank for oil cooling, wherein the temperature of quenching oil in the first quenching oil tank is 450 ℃, and continuously stirring for 50 min; taking out and putting the mixture into a second quenching oil tank for oil cooling, wherein the temperature of quenching oil in the second quenching oil tank is 90 ℃, and continuously stirring for 1.5 h;
step four, after the material is taken out, spraying a waterproof coating and an anticorrosive coating on the surface of the material, and drying the material by using hot air after spraying, wherein the temperature of the hot air is 80 ℃;
and fifthly, putting the material into a tempering furnace for tempering twice, wherein the tempering temperature of the first tempering is 170 ℃, the tempering time is 3.5 hours, the rising temperature of the second tempering is 340 ℃, the tempering time is 5.5 hours, and then cooling the material to room temperature.
Example 3
The automatic tempering double heat treatment method for the lock shell of the automobile comprises the following steps:
step one, processing raw materials into materials with uniform thickness and uniform hardness, putting the materials into a container, pouring a cleaning agent until the materials are completely soaked in the cleaning agent, raising the temperature of the container to 50 ℃, continuously stirring for 1.2h, taking out the materials, washing the materials with clear water, drying the materials, sending the materials into a dephosphorization tank for descaling, wherein the dephosphorization solution in the dephosphorization tank is 3.5g/L potassium hydroxide solution or 3.5g/L sodium hydroxide solution; the cleaning agent comprises the following components in parts by mass: 20 parts of diacetic acid, 22 parts of citric acid, 18 parts of tetrafluoroboric acid, 20 parts of 1-methyl-3-ethylimidazole chloride, 22 parts of n-dodecane, 8 parts of triethanolamine oleate salt, 15 parts of sodium sulfate and 25 parts of water;
step two, putting the material into a quenching furnace for quenching treatment, and continuously stirring, wherein the stirring speed is 550 revolutions per minute, the heating rate of the quenching furnace is 100 degrees per minute, the temperature of the quenching furnace is slowly increased to 630 degrees, and the temperature is kept for 25 minutes for carrying out primary quenching treatment; slowly raising the temperature of the quenching furnace to 780 ℃, preserving the heat for 2 hours, and carrying out secondary quenching treatment; slowly raising the temperature of the quenching furnace to 910 ℃, preserving the heat for 2.5 hours, and carrying out quenching treatment for the third time;
taking out the quenched material, putting the quenched material into a first quenching oil tank for oil cooling, wherein the temperature of quenching oil in the first quenching oil tank is 420 ℃, and continuously stirring for 42 min; taking out and putting the mixture into a second quenching oil tank for oil cooling, wherein the temperature of quenching oil in the second quenching oil tank is 85 ℃, and continuously stirring for 1.3 h;
step four, after the material is taken out, spraying a waterproof coating and an anticorrosive coating on the surface of the material, and drying the material by using hot air after spraying, wherein the temperature of the hot air is 77 ℃;
and fifthly, putting the material into a tempering furnace for tempering twice, wherein the tempering temperature of the first tempering is 160 ℃, the tempering time is 2.5 hours, the rising temperature of the second tempering is 300 ℃, the tempering time is 4.5 hours, and then cooling the material to room temperature.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims (9)

1. The automatic quenching and tempering double heat treatment method for the automobile lock shell is characterized by comprising the following steps of:
step one, processing raw materials into materials with uniform thickness and uniform hardness, putting the materials into a container, pouring a cleaning agent until the materials are completely soaked in the cleaning agent, continuously stirring for 1-2 hours, taking out the materials, washing the materials with clear water, and drying the materials for later use;
secondly, putting the material into a quenching furnace for quenching treatment, continuously stirring at the stirring speed of 400-580 revolutions per minute, slowly raising the temperature of the quenching furnace to 580-650 ℃, preserving the heat for 20-25 min, and carrying out primary quenching treatment; slowly raising the temperature of the quenching furnace to 650-900 ℃, preserving the heat for 1.0-2.8 hours, and carrying out secondary quenching treatment; slowly raising the temperature of the quenching furnace to 880-950 ℃, preserving the heat for 2.5-4 hours, and carrying out quenching treatment for the third time;
taking out the quenched material, putting the quenched material into a first quenching oil tank for oil cooling, and continuously stirring for 35-50 min; taking out the mixture, putting the mixture into a second quenching oil tank for oil cooling, and continuously stirring for 1.2-1.5 h;
after the material is taken out, spraying a waterproof coating and an anticorrosive coating on the surface of the material, and drying the material by using hot air after spraying;
and fifthly, putting the material into a tempering furnace for tempering twice, and then cooling the material to room temperature.
2. The automatic quenching and tempering double heat treatment method for the lock shell of the automobile according to claim 1, wherein in the first step, the cleaning agent comprises the following components in parts by mass: 15-26 parts of diacetic acid, 20-23 parts of citric acid, 12-23 parts of tetrafluoroboric acid, 16-24 parts of 1-methyl-3-ethylimidazole chloride, 18-27 parts of n-dodecane, 4-12 parts of triethanolamine oleate, 13-16 parts of sodium sulfate and 22-28 parts of water.
3. The automatic quenching and tempering double heat treatment process for the lock case of the automobile according to claim 1, wherein in the step one, the temperature of the container is increased to 45-60 ℃.
4. The automatic quenching and tempering double heat treatment method for the lock shell of the automobile according to claim 1, wherein in the first step, the material is dried and then sent into a dephosphorization tank for descaling treatment, and the dephosphorization solution in the dephosphorization tank is potassium hydroxide solution with concentration of 2.8-4.5 g/L or sodium hydroxide solution with concentration of 2.1-5.5 g/L.
5. The automatic quenching and tempering double heat treatment method for the lock shell of the automobile according to claim 1, wherein in the second step, the temperature rise rate of the quenching furnace is 80-110 ℃/min.
6. The automatic quenching and tempering double heat treatment method for the lock case of the automobile according to claim 1, wherein in the third step, the temperature of the quenching oil in the first quenching oil tank is 380-450 ℃, and the temperature of the quenching oil in the second quenching oil tank is 80-90 ℃.
7. The automatic quenching and tempering double heat treatment method for the lock case of the automobile according to claim 1, wherein in the fourth step, the temperature of the hot wind is 75-80 ℃.
8. The automatic tempering double heat treatment method for the lock shell of the automobile according to claim 1, wherein in the fifth step, the tempering temperature of the first tempering treatment is 150-170 ℃ and the tempering time is 2-3.5 h.
9. The automatic quenching and tempering double heat treatment method for the lock case of the automobile according to claim 1, wherein in the step five, the temperature of the second tempering is raised to 280-340 ℃, and the tempering time is 3.5-5.5 h.
CN202011232376.7A 2020-11-06 2020-11-06 Automatic quenching and tempering double heat treatment method for automobile lock shell Withdrawn CN114438287A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011232376.7A CN114438287A (en) 2020-11-06 2020-11-06 Automatic quenching and tempering double heat treatment method for automobile lock shell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011232376.7A CN114438287A (en) 2020-11-06 2020-11-06 Automatic quenching and tempering double heat treatment method for automobile lock shell

Publications (1)

Publication Number Publication Date
CN114438287A true CN114438287A (en) 2022-05-06

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN114438287A (en)

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Application publication date: 20220506