CN112941275A - Anti-deformation salt bath quenching process for clutch reinforcing disc - Google Patents
Anti-deformation salt bath quenching process for clutch reinforcing disc Download PDFInfo
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- CN112941275A CN112941275A CN202110150464.0A CN202110150464A CN112941275A CN 112941275 A CN112941275 A CN 112941275A CN 202110150464 A CN202110150464 A CN 202110150464A CN 112941275 A CN112941275 A CN 112941275A
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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
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/607—Molten salts
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- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a deformation-preventing salt bath quenching process for a clutch reinforcing disc, which comprises the following steps: the salt bath quenching furnace and the constant pressure tempering furnace are characterized in that a clutch reinforcing disc is subjected to double-stage heat treatment for austenitizing, isothermal salt bath quenching and isothermal salt bath quenching are adopted: preheating at a temperature above 85% of the heating temperature, continuously heating at the heating temperature for not less than 40min, and keeping the isothermal temperature of the salt bath at 280 ℃ for 50 min; after quenching, constant-pressure medium-temperature tempering is adopted: the constant pressure of 26Mpa can be always applied to the product by adopting air cooling and keeping the pressure of the tool during tempering in cooperation with a pressing device arranged at the top of the cooling table. The invention has the advantages that the size variation of the quenched product can be minimized and controlled; avoiding the influence on the shaping effect after the tempering stress is released.
Description
Technical Field
The invention relates to the technical field of metal processing, in particular to a deformation-preventing salt bath quenching process for a clutch reinforcing disc.
Background
The metal heat treatment is a heat treatment process in which a metal or an alloy is heated to a certain temperature in a solid state, held for a certain period of time, cooled at different cooling rates, and organically combined with the four elements of the heating rate, the heating temperature, the holding time, and the cooling rate to cause phase transformation, thereby forming various structures and obtaining desired service properties.
In order to ensure the quality and service life of mechanical products, important mechanical parts are generally subjected to heat treatment, for example, 60-70% of the parts in the machine tool manufacturing industry, 70-80% of the parts in the automobile and tractor manufacturing industry, and 100% of the parts in the tool and die manufacturing industry are subjected to heat treatment.
The heat treatment is a key process in the manufacturing process of mechanical parts and tools and dies, is also an important basic technology in the mechanical industry, and has very important significance for fully playing the performance potential of metal materials, improving the internal quality of products, saving materials, reducing energy consumption, prolonging the service life of the products and improving economic benefits.
For the heat treatment of the clutch reinforcing disc, the size variation of a product is large after the heat treatment of the clutch reinforcing disc is carried out by the conventional heat treatment process, and sometimes the product is unqualified due to the fact that the product exceeds a standard amount; and after the product is tempered, the shaping effect of the product is influenced after the tempering stress is released.
Disclosure of Invention
The invention aims to provide an anti-deformation salt bath quenching process for a clutch reinforcing disc, which has the advantages that the size variation of a quenched product can be controlled in a minimized manner; the method has the advantages of avoiding the influence on the shaping effect after the tempering stress is released, and solving the problems that the size variation of the product after heat treatment is large and sometimes exceeds the standard amount to cause the product to be unqualified; and after the product is tempered, the shaping effect of the product is influenced after the tempering stress is released.
In order to achieve the purpose, the invention provides the following technical scheme: an anti-deformation salt bath quenching process for a clutch reinforcing disc comprises the steps of firstly, carrying out double-stage heat treatment on the clutch reinforcing disc to carry out austenitization, and carrying out isothermal salt bath quenching; tempering at constant pressure and medium temperature after quenching;
isothermal salt bath quenching: preheating at a temperature above 85% of the heating temperature, continuously heating at the heating temperature for not less than 40min, and keeping the isothermal temperature of the salt bath at 280 ℃ for 50 min;
constant-pressure medium-temperature tempering: the constant pressure of 26Mpa can be always applied to the product by adopting air cooling and keeping the pressure of the tool during tempering in cooperation with a pressing device arranged on the top of the cooling table;
the apparatus comprises: a salt bath quenching furnace and a constant pressure tempering furnace.
As a further scheme of the invention, the process parameters of isothermal salt bath quenching are set as follows:
the preheating temperature is 800 ℃, the heating and heat preservation temperature is 900 ℃, the heating time is 40min, the C concentration in the furnace is 0.5%, the salt bath isothermal temperature is 280 ℃, and the salt bath isothermal time is 50 min.
As a further aspect of the invention, a salt bath quenching furnaceProtective gas RX is introduced into the reactor at the flow rate of 15m3Propane was used as the enriching gas.
As a further scheme of the invention, the process parameters of the constant-pressure medium-temperature tempering are set as follows:
the tempering temperature in the constant-pressure tempering furnace is set to be 380 ℃, the tempering time is 40min, and the pressure for pressing the tool clamp is 26 Mpa.
As a further scheme of the invention, the tempered clutch reinforcing disc is subjected to air cooling for 8 hours, and the clutch reinforcing disc is clamped by the tool clamp under the pressure of 26Mpa up and down in the air cooling process until the air cooling is finished.
An anti-deformation salt bath quenching process for a clutch reinforcing disc comprises the following quenching process flows:
s1, adjusting the temperature of the heating device to 800 ℃, sending the clutch reinforcing disc to be quenched into the heating device, and preheating the clutch reinforcing disc by the heating device at 800 ℃ as a preheating temperature for 8-10 min;
s2, after the preheating time is up, adjusting the temperature of the heating device to 900 ℃, keeping the temperature still, and heating the preheated clutch reinforcing disc for 40 min;
s3, setting the solution concentration in the salt bath quenching furnace to be 0.5%, setting the isothermal temperature of the salt bath to be 280 ℃ and setting the isothermal time of the salt bath to be 50 min;
s4, feeding the heated clutch reinforcing disc into a salt bath quenching furnace for quenching treatment, and simultaneously quenching the clutch reinforcing disc and feeding the clutch reinforcing disc into the salt bath quenching furnace at a speed of 15m3RX gas was passed as protective gas and propane was used as enriching gas.
An anti-deformation salt bath quenching process for a clutch reinforcing disc comprises the following tempering process flows:
s1, after quenching, taking out and placing the clutch reinforcing disc into a special tool clamp, aligning the clutch reinforcing disc with the tool clamp up and down during clamping, and connecting the tool clamp with a pressing device arranged on the top of the cooling table, so that the tool clamp can always apply constant pressure of 26Mpa to a product;
s2, pushing the tool clamp provided with the clutch reinforcing disc into a special constant-pressure tempering furnace to perform medium-temperature tempering treatment, wherein the tempering temperature is set to 380 ℃, the tempering time is set to 40min, and the tool clamp clamps the clutch reinforcing disc all the time in the tempering treatment process;
s3, after tempering is finished, taking the tool clamp provided with the clutch reinforcing disc out of the furnace, and still keeping the pressure of 26Mpa above and below the tool clamp to carry out air cooling on the clutch reinforcing disc for 8 h;
and S4, after air cooling is finished, removing the pressure at the tooling fixture, opening the tooling fixture, and taking out the clutch reinforcing disc.
As a further scheme of the invention, the technical indexes are as follows:
surface hardness of the clutch reinforcing disc: HRC 40-50;
flatness of the clutch reinforcing plate: less than 0.5 mm;
salt bath temperature: 900 ℃;
tempering temperature: 380 ℃;
pressure of the tool clamp: 26 Mpa.
Compared with the prior art, the invention has the following beneficial effects: the clutch reinforcing disc is subjected to heat treatment in an isothermal salt bath quenching mode, double-stage heat treatment is firstly applied to the clutch reinforcing disc for austenitizing, namely, the clutch reinforcing disc is preheated at a temperature of more than 85% of the heating temperature, then the clutch reinforcing disc is continuously heated for not less than 40min at the heating temperature, the isothermal temperature of the salt bath is kept for 50min at 280 ℃, and the size variation of a quenched product can be controlled in a minimized mode.
The constant-pressure medium-temperature tempering process is adopted, the quenched clutch reinforcing disc is subjected to medium-temperature tempering and heat preservation in a customized tool clamp, air cooling is adopted after tempering, the tool pressure during tempering is kept, a pressing device arranged on the top of a cooling table is matched to always keep constant pressure of 26Mpa applied to the product, the product is decompressed and taken out after cooling is finished, the influence on the shaping effect after tempering stress is released is avoided, and the flatness can reach 0.5 mm.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1, an embodiment of the present invention: an anti-deformation salt bath quenching process for a clutch reinforcing disc comprises the following steps: a salt bath quenching furnace and a constant pressure tempering furnace; firstly, performing double-stage heat treatment on a clutch reinforcing disc to austenitize, and quenching by adopting isothermal salt bath; after quenching, constant-pressure medium-temperature tempering is adopted.
Isothermal salt bath quenching: firstly, the temperature is more than 85 percent of the heating temperaturePreheating, continuously heating at a heating temperature of not less than 40min, and maintaining the isothermal temperature of the salt bath at 280 ℃ for 50 min; protective gas RX gas is introduced into the salt bath quenching furnace at the flow rate of 15m3Propane was used as the enriching gas. Setting the technological parameters of isothermal salt bath quenching:
the preheating temperature is 800 ℃, the heating and heat preservation temperature is 900 ℃, the heating time is 40min, the C concentration in the furnace is 0.5%, the salt bath isothermal temperature is 280 ℃, and the salt bath isothermal time is 50 min.
Constant-pressure medium-temperature tempering: the constant pressure of 26Mpa can be always applied to the product by adopting air cooling and keeping the pressure of the tool during tempering in cooperation with a pressing device arranged on the top of the cooling table; setting the process parameters of constant-pressure medium-temperature tempering:
the tempering temperature in the constant-pressure tempering furnace is set to be 380 ℃, the tempering time is 40min, and the pressure for pressing the tool clamp is 26 Mpa.
And (3) air cooling the tempered clutch reinforcing disc for 8h, and in the air cooling process, keeping the pressure of 26Mpa above and below the tool clamp to clamp the clutch reinforcing disc until the air cooling is finished.
Example 2
The embodiment provided by the invention comprises the following steps: an anti-deformation salt bath quenching process for a clutch reinforcing disc comprises the following quenching process flows:
s1, adjusting the temperature of the heating device to 800 ℃, sending the clutch reinforcing disc to be quenched into the heating device, and preheating the clutch reinforcing disc by the heating device at 800 ℃ as a preheating temperature for 8-10 min;
s2, after the preheating time is up, adjusting the temperature of the heating device to 900 ℃, keeping the temperature still, and heating the preheated clutch reinforcing disc for 40 min;
s3, setting the solution concentration in the salt bath quenching furnace to be 0.5%, setting the isothermal temperature of the salt bath to be 280 ℃ and setting the isothermal time of the salt bath to be 50 min;
s4, feeding the heated clutch reinforcing disc into a salt bath quenching furnace for quenching treatment, and simultaneously quenching the clutch reinforcing disc and feeding the clutch reinforcing disc into the salt bath quenching furnace at a speed of 15m3RX gas was passed as protective gas and propane was used as enriching gas.
The clutch reinforcing disc is subjected to heat treatment in an isothermal salt bath quenching mode, double-stage heat treatment is firstly applied to the clutch reinforcing disc for austenitizing, namely, the clutch reinforcing disc is preheated at a temperature of more than 85% of the heating temperature, then the clutch reinforcing disc is continuously heated for not less than 40min at the heating temperature, the isothermal temperature of the salt bath is kept for 50min at 280 ℃, and the size variation of a quenched product can be controlled in a minimized mode.
Example 3
The embodiment provided by the invention comprises the following steps: an anti-deformation salt bath quenching process for a clutch reinforcing disc comprises the following tempering process flows:
s1, after quenching, taking out and placing the clutch reinforcing disc into a special tool clamp, aligning the clutch reinforcing disc with the tool clamp up and down during clamping, and connecting the tool clamp with a pressing device arranged on the top of the cooling table, so that the tool clamp can always apply constant pressure of 26Mpa to a product;
s2, pushing the tool clamp provided with the clutch reinforcing disc into a special constant-pressure tempering furnace to perform medium-temperature tempering treatment, wherein the tempering temperature is set to 380 ℃, the tempering time is set to 40min, and the tool clamp clamps the clutch reinforcing disc all the time in the tempering treatment process;
s3, after tempering is finished, taking the tool clamp provided with the clutch reinforcing disc out of the furnace, and still keeping the pressure of 26Mpa above and below the tool clamp to carry out air cooling on the clutch reinforcing disc for 8 h;
and S4, after air cooling is finished, removing the pressure at the tooling fixture, opening the tooling fixture, and taking out the clutch reinforcing disc.
The constant-pressure medium-temperature tempering process is adopted, the quenched clutch reinforcing disc is subjected to medium-temperature tempering and heat preservation in a customized tool clamp, air cooling is adopted after tempering, the tool pressure during tempering is kept, a pressing device arranged on the top of a cooling table is matched to always keep constant pressure of 26Mpa applied to the product, the product is decompressed and taken out after cooling is finished, the influence on the shaping effect after tempering stress is released is avoided, and the flatness can reach 0.5 mm.
Example 4
The embodiment provided by the invention comprises the following steps: an anti-deformation salt bath quenching process for a clutch reinforcing disc has the technical indexes that:
surface hardness of the clutch reinforcing disc: HRC 40-50;
flatness of the clutch reinforcing plate: less than 0.5 mm;
salt bath temperature: 900 ℃;
tempering temperature: 380 ℃;
pressure of the tool clamp: 26 Mpa.
Economic indexes are as follows:
yield per furnace or hour per production time per unit volume yield per year. Other savings properties may also be added, such as: 3 people are saved, the salary of each person is calculated at 6000 yuan/month, and 3 × 6000 × 12 is saved in the year as 216000 yuan; the electricity is saved by 10 degrees in unit production, and the electricity is saved by 10 x 10000 x 1.2 yuan to 120000 yuan in 10000 pieces per year.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. An anti-deformation salt bath quenching process for a clutch reinforcing disc is characterized by comprising the following steps of: firstly, performing double-stage heat treatment on a clutch reinforcing disc to austenitize, and quenching by adopting isothermal salt bath; tempering at constant pressure and medium temperature after quenching;
isothermal salt bath quenching: preheating at a temperature above 85% of the heating temperature, continuously heating at the heating temperature for not less than 40min, and keeping the isothermal temperature of the salt bath at 280 ℃ for 50 min;
constant-pressure medium-temperature tempering: the constant pressure of 26Mpa can be always applied to the product by adopting air cooling and keeping the pressure of the tool during tempering in cooperation with a pressing device arranged on the top of the cooling table;
the apparatus comprises: a salt bath quenching furnace and a constant pressure tempering furnace.
2. The clutch reinforcing disc deformation-preventing salt bath quenching process as claimed in claim 1, which is characterized in that: setting the technological parameters of isothermal salt bath quenching:
the preheating temperature is 800 ℃, the heating and heat preservation temperature is 900 ℃, the heating time is 40min, the C concentration in the furnace is 0.5%, the salt bath isothermal temperature is 280 ℃, and the salt bath isothermal time is 50 min.
3. The clutch reinforcing disc deformation-preventing salt bath quenching process as claimed in claim 1, which is characterized in that: protective gas RX gas is introduced into the salt bath quenching furnace at the flow rate of 15m3Propane was used as the enriching gas.
4. The clutch reinforcing disc deformation-preventing salt bath quenching process as claimed in claim 1, which is characterized in that: setting the process parameters of constant-pressure medium-temperature tempering:
the tempering temperature in the constant-pressure tempering furnace is set to be 380 ℃, the tempering time is 40min, and the pressure for pressing the tool clamp is 26 Mpa.
5. The clutch reinforcing disc deformation-preventing salt bath quenching process as claimed in claim 1, which is characterized in that: and (3) air cooling the tempered clutch reinforcing disc for 8h, and in the air cooling process, keeping the pressure of 26Mpa above and below the tool clamp to clamp the clutch reinforcing disc until the air cooling is finished.
6. The clutch reinforcing disc deformation-preventing salt bath quenching process as claimed in claim 1, which is characterized in that: quenching process flow:
s1, adjusting the temperature of the heating device to 800 ℃, sending the clutch reinforcing disc to be quenched into the heating device, and preheating the clutch reinforcing disc by the heating device at 800 ℃ as a preheating temperature for 8-10 min;
s2, after the preheating time is up, adjusting the temperature of the heating device to 900 ℃, keeping the temperature still, and heating the preheated clutch reinforcing disc for 40 min;
s3, setting the solution concentration in the salt bath quenching furnace to be 0.5%, setting the isothermal temperature of the salt bath to be 280 ℃ and setting the isothermal time of the salt bath to be 50 min;
s4, feeding the heated clutch reinforcing disc into a salt bath quenching furnace for quenching treatment, and simultaneously quenching the clutch reinforcing disc and feeding the clutch reinforcing disc into the salt bath quenching furnace at a speed of 15m3RX gas was passed as protective gas and propane was used as enriching gas.
7. The clutch reinforcing disc deformation-preventing salt bath quenching process as claimed in claim 1, which is characterized in that: the tempering process flow comprises the following steps:
s1, after quenching, taking out and placing the clutch reinforcing disc into a special tool clamp, aligning the clutch reinforcing disc with the tool clamp up and down during clamping, and connecting the tool clamp with a pressing device arranged on the top of the cooling table, so that the tool clamp can always apply constant pressure of 26Mpa to a product;
s2, pushing the tool clamp provided with the clutch reinforcing disc into a special constant-pressure tempering furnace to perform medium-temperature tempering treatment, wherein the tempering temperature is set to 380 ℃, the tempering time is set to 40min, and the tool clamp clamps the clutch reinforcing disc all the time in the tempering treatment process;
s3, after tempering is finished, taking the tool clamp provided with the clutch reinforcing disc out of the furnace, and still keeping the pressure of 26Mpa above and below the tool clamp to carry out air cooling on the clutch reinforcing disc for 8 h;
and S4, after air cooling is finished, removing the pressure at the tooling fixture, opening the tooling fixture, and taking out the clutch reinforcing disc.
8. The clutch reinforcing disc deformation-preventing salt bath quenching process as claimed in claim 1, which is characterized in that: the technical indexes are as follows:
surface hardness of the clutch reinforcing disc: HRC 40-50;
flatness of the clutch reinforcing plate: less than 0.5 mm;
salt bath temperature: 900 ℃;
tempering temperature: 380 ℃;
pressure of the tool clamp: 26 Mpa.
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| CN202110150464.0A CN112941275A (en) | 2021-02-03 | 2021-02-03 | Anti-deformation salt bath quenching process for clutch reinforcing disc |
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| CN202110150464.0A CN112941275A (en) | 2021-02-03 | 2021-02-03 | Anti-deformation salt bath quenching process for clutch reinforcing disc |
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