CN109735793B - Carburizing and quenching heat treatment method for transmission taper sleeve and tool thereof - Google Patents
Carburizing and quenching heat treatment method for transmission taper sleeve and tool thereof Download PDFInfo
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Abstract
The invention discloses a carburizing and quenching heat treatment method for a transmission taper sleeve and a tool thereof, which relate to the technical field of surface heat treatment of automobile parts and comprise the following steps of S1, filling the transmission taper sleeve on a special tool; s2, conveying the transmission taper sleeve into a cleaning machine for cleaning; s3, conveying the transmission taper sleeve subjected to the cleaning treatment before the cleaning treatment into a preheating furnace for heating; s4, conveying the transmission taper sleeve subjected to preheating treatment into a heating chamber of the gas carburizing box type multipurpose furnace to complete carburizing heat treatment, and then transferring the transmission taper sleeve into an oil groove of the gas carburizing box type multipurpose furnace to perform quenching heat treatment; s5, conveying the speed changer taper sleeve subjected to carburizing and quenching into a cleaning machine for cleaning; and S6, conveying the transmission taper sleeve subjected to the cleaning treatment into a tempering furnace for tempering treatment. The speed changer taper sleeve is filled in a special tool to finish the carburizing and quenching heat treatment operation, so as to achieve the purposes of improving the hardness and the wear resistance of the outer circular surface of the speed changer taper sleeve and reducing the hardness of the inner hole of the speed changer taper sleeve.
Description
Technical Field
The invention relates to the technical field of surface heat treatment of automobile parts, in particular to a carburizing and quenching heat treatment method and a tool for a transmission taper sleeve.
Background
With the rapid development of automobile industry in China, the automobile holding capacity and the automobile annual sales volume are greatly improved, and joint-investment brands and independent brands increase the investment of research and development of automobile industry technology, so that various advanced heat treatment technologies which are based on the concepts of high quality, energy conservation and environmental protection are widely applied to the production of automobile parts. The heat treatment technology is an important technical means for obtaining the required service performance of the automobile parts, and is also an important guarantee for realizing the reliability, durability and safety of the product, especially for the surface heat treatment of the automobile parts, the heat treatment technology is directly related to the stability and safety of the automobile operation.
The speed variator for automobile is used to coordinate the rotation speed of engine and the actual running speed of wheels, and can generate different speed ratios between engine and wheels during running of automobile to make the engine of automobile perform optimal performance.
In an automotive transmission, a transmission cone is mounted on a parking system pull rod. The transmission taper sleeve is mostly made of low-carbon alloy steel and is installed in the automobile transmission after machining and heat treatment, due to the limitation of equipment manufacturing technology and production and machining technology, the hardness of an inner hole of the taper sleeve is sometimes too high, and the taper sleeve with the too high hardness of the inner hole can cause the surface abrasion of the pull rod, even cause the early failure of the pull rod, and influence the driving safety. The abrasion of the pull rod can cause a certain amount of metal particles to be peeled off and enter transmission lubricating oil, the transmission lubricating oil is polluted, the internal cleanliness of the transmission is influenced, meanwhile, the peeled metal particles can enter meshed gear surfaces along with the lubricating oil, the meshing precision of gears is reduced, and the service life of the transmission and the driving safety of vehicles are further influenced.
In the prior art, the inner hole is generally blocked by matching a bolt and a nut so as to prevent metal particles from being peeled off and falling into lubricating oil of a transmission, or impermeable coating is coated on the inner hole of a conical sleeve of the transmission. The two solutions have complicated operation steps, the hardness of the inner hole of the transmission taper sleeve is high due to failure of the measures in the heat treatment process, and no method for detecting the hardness of the inner hole is provided in the later period. Therefore, how to ensure the hardness and the wear resistance of the outer circular surface of the transmission taper sleeve while reducing the hardness of the inner hole of the transmission taper sleeve is a problem to be solved by people in the industry.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide a tooling for carburizing and quenching heat treatment of a transmission taper sleeve, in which the transmission taper sleeve is filled in the tooling formed by a base, an upright rod and a cap, so as to achieve the purpose of sealing an inner hole of the transmission taper sleeve, and further achieve the purpose of reducing the hardness of the inner hole of the transmission taper sleeve without affecting the hardness and wear resistance of an outer circular surface of the transmission taper sleeve.
In order to realize the purpose, the following technical scheme is provided: a tool for carburizing and quenching heat treatment of a transmission taper sleeve comprises a base, wherein mounting holes are uniformly formed in the base, the mounting holes are arranged on the base in a staggered mode to form a lattice-shaped structure, and vertical rods are vertically inserted in the mounting holes; the speed changer taper sleeve is vertically sleeved on the vertical rod, a cap is arranged on the top end cover of the vertical rod, and the cap seals an opening of an inner hole in the upper end of the speed changer taper sleeve on the top end.
Through adopting above-mentioned technical scheme, the operating personnel will wait to carry out the derailleur taper sleeve packing of thermal treatment operation in the pole setting to cover the block, in order to reach the purpose of sealing derailleur taper sleeve hole, and the pole setting sets up according to lattice column structure align to grid on the base, the derailleur taper sleeve in different poles settings is arranged according to lattice column structure promptly, in order to reach the purpose that improves the permeability of derailleur taper sleeve when carrying out thermal treatment operation, be favorable to the formation of the outer disc stereoplasm layer of derailleur taper sleeve. The speed changer taper sleeve is filled on a tool consisting of a base, a vertical rod and a cover cap, and the speed changer taper sleeve is loaded by the tool to finish carburizing and quenching heat treatment operation, so that the aims of reducing the hardness of an inner hole of the speed changer taper sleeve and improving the hardness and the wear resistance of an outer circular surface of the speed changer taper sleeve are fulfilled.
The invention is further configured to: the diameter difference between the outer circle of the vertical rod and the inner hole of the transmission taper sleeve is set to be 0.05-0.15 mm.
By adopting the technical scheme, the difference range between the excircle diameter of the upright rod and the inner hole diameter of the transmission taper sleeve is set to be 0.05-0.15mm, so that the aim of balancing the inner hole hardness of the transmission taper sleeve is fulfilled, namely the aim of reducing the inner hole hardness of the transmission taper sleeve is fulfilled by limiting the carburizing effect.
In view of the above technical problems, a second object of the present invention is to provide a carburizing and quenching heat treatment method for a transmission taper sleeve, wherein the transmission taper sleeve is filled in a special tool, and then carburizing and quenching heat treatment is performed, so as to achieve the purposes of reducing the hardness of an inner hole of the transmission taper sleeve and improving the hardness and wear resistance of an outer circular surface of the transmission taper sleeve.
In order to realize the purpose, the following technical scheme is provided: s1, loading, namely filling a transmission taper sleeve raw material to be processed on a special tool; s2, front cleaning, namely conveying the special tool filled with the transmission taper sleeve raw material into a cleaning machine for cleaning; s3, preheating, namely conveying the special tool filled with the transmission taper sleeve raw material and subjected to the cleaning treatment into a preheating furnace for preheating-heat preservation operation; s4, carburizing and quenching, namely conveying the special tool filled with the transmission taper sleeve raw material subjected to preheating treatment into a heating chamber of a gas carburizing box type multipurpose furnace, introducing nitrogen, methanol and acetone, controlling the carbon potential in the process, carrying out ventilation and heating processes, and transferring the special tool filled with the transmission taper sleeve into an oil tank of the gas carburizing box type multipurpose furnace to carry out quenching heat treatment after completing the carburizing heat treatment; s5, post-cleaning, namely feeding the tool filled with the transmission taper sleeve and subjected to carburization quenching into a cleaning machine for secondary cleaning; s6, tempering, namely conveying the special tool filled with the transmission taper sleeve raw material after the cleaning treatment into a tempering furnace for tempering treatment.
By adopting the technical scheme, an operator fills the transmission taper sleeve to be processed in the special tool, and then transfers the special tool among the processes of front cleaning, preheating, rear cleaning, carburizing and quenching, rear cleaning and tempering, thereby completing the carburizing and quenching heat treatment operation of the transmission taper sleeve raw material. The front cleaning and the rear cleaning both play a role in cleaning the transmission taper sleeve, prepare for subsequent heat treatment operation, indirectly play a role in improving the stability of carburizing and quenching heat treatment of the transmission taper sleeve, and further achieve the purpose of improving the quality of an excircle hardened layer of the transmission taper sleeve. In the carburizing and quenching process, the carburizing effect of the inner hole and the outer circular surface of the transmission taper sleeve filled in the special tool is different, a hardened layer (or a hard layer) is formed on the outer circular surface of the transmission taper sleeve, the hardness of the inner hole of the transmission taper sleeve is not too high, the hardness of the inner hole of the transmission taper sleeve is reduced, and the hardness and the wear resistance of the outer circular surface of the transmission taper sleeve are improved.
The invention is further configured to: in the carburizing and heating process of step S4, the heating chamber needs to undergo three stages of temperature rise-heat preservation-temperature reduction, and the heat preservation temperature of the heating chamber is set to 850-.
By adopting the technical scheme, the heat preservation temperature range in the carburizing stage is set to 850-; and the temperature reduction range in the carburizing stage is set to 800-840 ℃, namely after the carburizing-heat preservation stage is completed, the transmission taper sleeve is cooled to a temperature reduction temperature slightly lower than the heat preservation temperature, and then is transferred to an oil groove for quenching treatment, so that the method is not only beneficial to stabilizing a hard layer, but also beneficial to reducing redundant energy consumption in the quenching treatment (the transmission taper sleeve has an initial temperature before the quenching treatment).
The invention is further configured to: a temperature rise-equalization stage and a temperature drop-equalization stage are respectively arranged after the temperature rise stage and the temperature drop stage, the heat preservation time of the temperature rise-equalization stage is set to be 15min-25min, and the heat preservation time of the temperature drop-equalization stage is set to be 25min-35 min.
By adopting the technical scheme, the purposes of setting the temperature rising-temperature equalizing stage and the temperature reducing-temperature equalizing stage and limiting the heat preservation time of the two stages are to stabilize the structure and the property of the transmission taper sleeve so as to facilitate the subsequent heat treatment operation; the temperature rise-temperature equalization stage is convenient for subsequent carburizing heat preservation treatment, and the temperature drop-temperature equalization stage is convenient for subsequent quenching treatment.
The invention is further configured to: in the heat preservation stage, the carburizing process comprises two stages of strong carburizing and diffusion, wherein the carbon potential of the strong carburizing is set to be 1.0-1.2Cp%, and the carbon potential of the diffusion is set to be 0.7-0.9 Cp%; in the warming-up phase, the carbon potential in the heating chamber is set to 0.6-1.0Cp%, and in the cooling-down phase, the carbon potential in the heating chamber is set to 0.7-0.9 Cp%.
By adopting the technical scheme, the strong infiltration process and the diffusion process in the heat preservation stage are matched, the hard layer is formed on the outer circular surface of the transmission taper sleeve, and the hard layer is diffused into the transmission taper sleeve, so that the stability is better; the carbon potential in the temperature rising stage is lower than that in the strong permeation stage, and the carbon potential in the diffusion stage is higher than that in the temperature rising stage and lower than that in the strong permeation stage, namely the carbon potential in the temperature rising stage plays a role in pre-carburizing, and the carbon potential in the temperature reducing stage plays a role in stabilizing.
The invention is further configured to: the treatment time of the strong penetration stage is set to be 60-150min, and the treatment time of the diffusion stage is set to be 40-120 min.
By adopting the technical scheme, the treatment time of the strong penetration stage and the diffusion stage is limited, and the treatment time of the strong penetration stage is longer than that of the diffusion stage, so that a better carburization effect is obtained.
The invention is further configured to: in the quenching process of step S4, the oil temperature in the oil tank is set to 140-.
By adopting the technical scheme, the oil temperature in the quenching treatment is limited, the stirring operation is carried out simultaneously, and the stirring speed is limited, so that a better quenching effect is obtained.
The invention is further configured to: in steps S2 and S5, the cleaning chamber of the cleaning machine is evacuated to a low vacuum state, and a hot cleaning liquid is charged therein.
By adopting the technical scheme, the front cleaning and the rear cleaning are both used for cleaning the outer circle surface and the inner hole surface of the transmission taper sleeve so as to facilitate subsequent heat treatment operation and further obtain better heat treatment effect; the reason for pumping the cleaning chamber to a bottom vacuum state and introducing the heated cleaning liquid is to further improve the stain removing effect of the transmission taper sleeve.
The invention is further configured to: and a hardened layer with the thickness of 0.3-0.5mm is formed on the outer circle surface of the speed changer taper sleeve after tempering heat treatment.
By adopting the technical scheme, after a series of heat treatments, the thickness of the hardened layer on the outer circle surface of the transmission taper sleeve is set to be 0.3-0.5mm, namely, the mechanical property of the transmission taper sleeve is not influenced while the hardened layer (or the hardened layer) with proper thickness is obtained.
In conclusion, the invention has the following beneficial effects:
one is as follows: by utilizing a special tool and a special heat treatment process flow, the purposes of improving the surface hardness and the wear resistance of the outer circle of the transmission taper sleeve and reducing the hardness of the inner hole of the transmission taper sleeve are achieved, and the purposes of improving the use stability and the safety of the transmission taper sleeve are further achieved;
the second step is as follows: the tool for the carburizing and quenching heat treatment of the transmission taper sleeve is a through type tool which is detachable in design, so that the hardness of an inner hole of the transmission taper sleeve is reduced, the hardness of the outer circular surface of the transmission taper sleeve is improved, the detection operation of a detector or an operator on the transmission taper sleeve is not influenced, and the carburizing and quenching heat treatment effect of the transmission taper sleeve is not adversely influenced;
and thirdly: the reduction of the hardness of the inner hole of the conical sleeve of the transmission is beneficial to reducing and even eliminating metal particles generated by abrasion, improving the cleanliness of lubricating oil and the inside of the transmission, ensuring the smooth and stable operation of the transmission, and being beneficial to improving the working stability and safety of the automobile transmission.
Drawings
FIG. 1 is a block flow diagram of a transmission taper sleeve carburizing and quenching heat treatment process;
FIG. 2 is a process flow diagram of a transmission taper sleeve carburizing and quenching process;
fig. 3 is a schematic view of an installation structure of the transmission taper sleeve special tool and the transmission taper sleeve.
Reference numerals: 1. a base; 2. mounting holes; 3. erecting a rod; 4. and (7) capping.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
as shown in figure 1, in the carburizing and quenching heat treatment method for the transmission taper sleeve, an operator uniformly fills the transmission taper sleeve to be treated on a tool special for carburizing and quenching heat treatment of the transmission taper sleeve, and ensures the filling permeability of the transmission taper sleeve during filling operation so as to ensure the carburizing and quenching heat treatment effect. According to the process flow, a special tool loaded with the transmission taper sleeve is transferred among a cleaning machine, a preheating furnace, a gas carburizing box type multipurpose furnace and a tempering furnace to finish the carburizing and quenching heat treatment operation of the transmission taper sleeve, so that the aims of improving the hardness and the wear resistance of the outer circular surface of the transmission taper sleeve and reducing the hardness of the inner hole of the transmission taper sleeve are fulfilled, and the aims of improving the working stability and the safety of the transmission taper sleeve and the transmission are fulfilled.
According to the process flow, the tool filled with the transmission taper sleeve needs to sequentially perform a front cleaning machine, a preheating furnace, a heating chamber of a gas carburizing box type multipurpose furnace, an oil tank of the gas carburizing box type multipurpose furnace, a rear cleaning machine and a tempering furnace, namely, the front cleaning, the preheating treatment, the carburizing treatment, the quenching treatment, the rear cleaning and the tempering treatment are sequentially completed, so that the whole carburizing and quenching heat treatment process is completed.
Referring to fig. 1 and 2, after the front cleaning is completed in the front cleaning machine, the special tool filled with the transmission taper sleeve needs to be transferred into a preheating furnace for preheating treatment, the transmission taper sleeve raw material needs to be kept warm for 15-30min after being heated in the preheating furnace, and then the transmission taper sleeve raw material is transferred to a gas carburizing box type multipurpose furnace for carburizing treatment and quenching treatment, so that the transmission taper sleeve raw material can be dried, the transmission taper sleeve raw material can obtain a certain initial temperature, and the redundant heat loss in the heating treatment of the gas carburizing box type multipurpose furnace is reduced.
When the carburizing treatment is carried out in the heating chamber of the gas carburizing box type multipurpose furnace, the indoor temperature of the heating chamber is controlled according to time, nitrogen, methanol and acetone are introduced into the heating chamber, and the carbon potential in the process is controlled according to the time so as to complete the processes of ventilation and temperature rise. The heating of the heating chamber comprises three stages of temperature rise, heat preservation and temperature reduction, the carbon potentials corresponding to the three stages are different, and the three stages need to be adjusted according to the time and the process flow requirements so as to obtain the best carburization treatment effect.
In the temperature-raising stage, the temperature-raising operation needs to be completed quickly within 50-90s, and in this embodiment, the temperature-raising operation is completed within 1min, and then the temperature-raising-temperature-equalizing stage is performed within 15-25min, and in this embodiment, the temperature-raising-temperature-equalizing stage is completed within 20min, so that the temperature is raised to the heat-preserving temperature of the heat-preserving stage, i.e., 850-. After the heat preservation stage, the temperature reduction operation needs to be completed quickly within 50-90s, and in this embodiment, the temperature reduction operation is completed within 1min, so that the temperature is reduced to 800-. The arrangement of the temperature rising-equalizing stage and the temperature reducing-equalizing stage is beneficial to keeping the stable structure and performance of the transmission taper sleeve after the temperature rising or the temperature reducing is finished, and is convenient for subsequent heat treatment operation.
The carbon potential of the speed changer taper sleeve is also changed in three different stages of temperature rise, heat preservation and temperature reduction. The carbon potential in the temperature rising stage and the temperature rising-temperature equalizing stage is 0.6-1.0Cp%, and the carbon potential in the temperature reducing stage and the temperature reducing-temperature equalizing stage is 0.7-0.9 Cp%. In the heat preservation stage, the carburizing treatment comprises two stages of strong carburizing and diffusion, and the carbon potential and the carburizing treatment time in the heat preservation stage are changed due to different specific stages of the carburizing treatment; the transmission taper sleeve completing the temperature rise stage and the temperature rise-temperature equalization stage firstly enters a strong permeation stage with the duration of 60-150min and the carbon potential of 1.0-1.2Cp%, then enters a diffusion stage with the duration of 40-120min and the carbon potential of 0.7-0.9Cp%, and then enters a temperature reduction stage and the temperature reduction-temperature equalization stage, so that a better carburization effect is obtained on the outer circular surface of the transmission taper sleeve.
The transmission taper sleeve raw material which finishes the carburization treatment is transferred to a front chamber oil tank of a gas carburization box type multipurpose furnace to be quenched, the oil temperature in the oil tank is set to 140-170 ℃, meanwhile, the oil in the oil tank needs to be stirred, the stirring speed is set to 1000-1400r/min, 1200r/min is selected in the embodiment, and a better transmission taper sleeve quenching effect is obtained; and the transmission taper sleeve after quenching treatment needs to finish oil draining operation at the oil groove of the front chamber and then enters a subsequent treatment stage.
In the front cleaning and the rear cleaning, the special tool filled with the transmission taper sleeve raw material needs to be sent into a cleaning machine to complete cleaning operation, the cleaning machine needs to be pumped to a low vacuum state, and hot cleaning liquid is introduced to achieve the purpose of cleaning and removing stains such as metal particles attached to the outer surface and the inner hole of the transmission taper sleeve, obtain a good cleaning effect and further achieve the purpose of safely and stably carrying out subsequent heat treatment operation.
And transferring the transmission taper sleeve subjected to the cleaning operation to a tempering furnace for tempering treatment, finally completing the whole process of the carburizing and quenching heat treatment operation of the transmission taper sleeve, and forming an effective hardened layer with the thickness of 0.3-0.5mm on the outer circle surface of the transmission taper sleeve, wherein the effective hardened layer is mainly acicular martensite and has high hardness and high wear resistance.
The present embodiment is further described below with reference to specific actions:
s1, loading, namely loading a transmission taper sleeve raw material to be processed on a special tool; s2, front cleaning, namely conveying the special tool filled with the transmission taper sleeve raw material into a cleaning machine for cleaning; s3, preheating, namely conveying the special tool filled with the transmission taper sleeve raw material and subjected to the cleaning treatment into a preheating furnace for preheating-heat preservation operation; s4, carburizing and quenching, namely conveying the special tool filled with the transmission taper sleeve raw material subjected to preheating treatment into a heating chamber of a gas carburizing box type multipurpose furnace, introducing nitrogen, methanol and acetone, controlling the carbon potential in the process, carrying out ventilation and heating processes, and transferring the special tool filled with the transmission taper sleeve into an oil tank of the gas carburizing box type multipurpose furnace to carry out quenching heat treatment after completing the carburizing heat treatment; s5, post-cleaning, namely feeding the tool filled with the transmission taper sleeve and subjected to carburization quenching into a cleaning machine for secondary cleaning; s6, tempering, namely conveying the special tool filled with the transmission taper sleeve raw material after the cleaning treatment into a tempering furnace for tempering treatment.
Example two:
as shown in fig. 3, a tooling for carburizing and quenching heat treatment of a transmission taper sleeve, namely a special tooling for carburizing and quenching heat treatment of a transmission taper sleeve, comprises a base 1 which is of a square structure, wherein a plurality of mounting holes 2 are uniformly arranged on the base 1, and the mounting holes 2 are arranged on the base 1 in a staggered manner to form a lattice structure. The mounting holes 2 can be vertically inserted to form the vertical rods 3, and a row of mounting holes 2 are formed between every two rows of vertical rods 3 at intervals so as to achieve the purpose of improving the heat treatment permeability of the transmission taper sleeve and further achieve the purpose of improving the heat treatment effect of the transmission taper sleeve. Two transmission taper sleeves are vertically sleeved on each upright rod 3, and one end with a large outer diameter of the upper transmission taper sleeve is covered outside one end with a small outer diameter of the lower transmission taper sleeve, namely the top end of the lower transmission taper sleeve vertically extends upwards into the bottom end of the upper transmission taper sleeve; the top end of the vertical rod 3 is sleeved with a cover cap 4, the cover cap 4 closes the top end opening of the upper-layer transmission taper sleeve, and the difference between the outer circle diameter of the vertical rod 3 and the inner hole diameter of the transmission taper sleeve is set to be 0.05-0.15mm, in the embodiment, 0.1mm is selected to be set. The inner hole of the speed changer taper sleeve can not form a hard layer in the carburizing and quenching heat treatment process under the action of a special tool, and the hardness of the inner hole can still meet the hardness requirement, but the hardness is reduced compared with the hardness of the outer circular surface of the speed changer taper sleeve.
The present embodiment is further described below with reference to specific actions:
the operating personnel locates pole setting 3 with pending derailleur taper sleeve superpose cover to interval arrangement sets up adjacent derailleur taper sleeve row, every sets up a mounting hole 2 row and sets up a derailleur taper sleeve row again promptly, and the cover is equipped with two derailleur taper sleeves on each pole setting 3, and make the top of the derailleur taper sleeve of lower floor vertically upwards stretch into the bottom of the derailleur taper sleeve of upper strata, then establish block 4 at the upper end cover of pole setting 3, so that block 4 seals the upper end opening of upper derailleur taper sleeve, thereby accomplish the operation of feeding of derailleur taper sleeve.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (6)
1. The utility model provides a derailleur taper sleeve carburization quenching frock for thermal treatment which characterized in that: the device comprises a base (1), wherein mounting holes (2) are uniformly formed in the base (1), the mounting holes (2) are arranged on the base (1) in a staggered mode to form a dot matrix structure, vertical upright rods (3) are vertically inserted into the mounting holes (2), and a row of mounting holes (2) are formed between every two rows of upright rods (3); the transmission taper sleeves are vertically sleeved on the vertical rods (3), two transmission taper sleeves are vertically sleeved on each vertical rod (3), and one end with a large outer diameter of the upper transmission taper sleeve is covered outside one end with a small outer diameter of the lower transmission taper sleeve; the top end cover of pole setting (3) is equipped with block (4), just block (4) seal the upper end hole opening that is located the derailleur taper sleeve on top.
2. The tooling for carburizing and quenching heat treatment of the transmission taper sleeve according to claim 1, characterized in that: the diameter difference between the excircle of the vertical rod (3) and the inner hole of the transmission taper sleeve is set to be 0.05-0.15 mm.
3. The carburizing and quenching heat treatment method for the transmission taper sleeve by using the tool according to any one of claims 1-2 is characterized in that: comprises the following steps of (a) carrying out,
s1, loading, namely loading a transmission taper sleeve raw material to be processed on a special tool;
s2, front cleaning, namely conveying the special tool filled with the transmission taper sleeve raw material into a cleaning machine for cleaning;
s3, preheating, namely conveying the special tool filled with the transmission taper sleeve raw material and subjected to the cleaning treatment into a preheating furnace for preheating-heat preservation operation;
s4, carburizing and quenching, namely conveying the special tool filled with the transmission taper sleeve raw material subjected to preheating treatment into a heating chamber of a gas carburizing box type multipurpose furnace, introducing nitrogen, methanol and acetone, controlling the carbon potential in the process, carrying out ventilation and heating processes, and transferring the special tool filled with the transmission taper sleeve into an oil tank of the gas carburizing box type multipurpose furnace to carry out quenching heat treatment after completing the carburizing heat treatment; in the carburizing and heating process of step S4, the heating chamber needs to undergo three stages of temperature rise-heat preservation-temperature reduction, the temperature rise completion time is 50-90S, the temperature preservation temperature of the heating chamber is set to 850-; a temperature rise-temperature equalization stage and a temperature drop-temperature equalization stage are respectively arranged after the temperature rise stage and the temperature drop stage, the heat preservation time of the temperature rise-temperature equalization stage is set to be 15min-25min, and the heat preservation time of the temperature drop-temperature equalization stage is set to be 25min-35 min; in the temperature change process, the carbon potential changes, in the heat preservation stage, the carburizing process comprises a strong carburizing stage and a diffusion stage, the carbon potential of the strong carburizing stage is set to be 1.0-1.2Cp%, the time is set to be 60-150min, the carbon potential of the diffusion stage is set to be 0.7-0.9Cp%, and the time is set to be 40-120 min; in the temperature rising stage and the temperature rising-temperature equalizing stage, the carbon potential in the heating chamber is set to be 0.6-1.0Cp%, and in the temperature reducing stage and the temperature reducing-temperature equalizing stage, the carbon potential in the heating chamber is set to be 0.7-0.9 Cp%;
s5, post-cleaning, namely feeding the tool filled with the transmission taper sleeve and subjected to carburization quenching into a cleaning machine for secondary cleaning;
s6, tempering, namely conveying the special tool filled with the transmission taper sleeve raw material after the cleaning treatment into a tempering furnace for tempering treatment.
4. The carburizing and quenching heat treatment method for the transmission taper sleeve according to claim 3, characterized in that: in the quenching process of step S4, the oil temperature in the oil tank is set to 140-.
5. The carburizing and quenching heat treatment method for the transmission taper sleeve according to claim 3, characterized in that: in steps S2 and S5, the cleaning chamber of the cleaning machine is evacuated to a low vacuum state, and a hot cleaning liquid is charged therein.
6. The carburizing and quenching heat treatment method for the transmission taper sleeve according to claim 3, characterized in that: and a hardened layer with the thickness of 0.3-0.5mm is formed on the outer circle surface of the speed changer taper sleeve after tempering heat treatment.
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| CN201910124088.0A CN109735793B (en) | 2019-02-20 | 2019-02-20 | Carburizing and quenching heat treatment method for transmission taper sleeve and tool thereof |
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| CN111519127A (en) * | 2020-05-29 | 2020-08-11 | 厦门真冈热处理有限公司 | Carburizing heat treatment method for obtaining high-quality pinion of car steering gear |
| CN111676441A (en) * | 2020-07-22 | 2020-09-18 | 厦门福鑫特工贸有限公司 | Heat treatment method and tool for motorcycle edge surface bolt |
| CN112322849A (en) * | 2020-11-10 | 2021-02-05 | 十堰澳贝科技有限公司 | Heat treatment process for ADI material of reference seat |
| CN113957228A (en) * | 2021-10-09 | 2022-01-21 | 上海丰东热处理工程有限公司 | Heat treatment process for transmission motor shaft |
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