CN111172492B - Device and method for gear surface carburization - Google Patents

Device and method for gear surface carburization Download PDF

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Publication number
CN111172492B
CN111172492B CN202010005736.3A CN202010005736A CN111172492B CN 111172492 B CN111172492 B CN 111172492B CN 202010005736 A CN202010005736 A CN 202010005736A CN 111172492 B CN111172492 B CN 111172492B
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servo valve
carburizing
carburizing furnace
temperature
furnace
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CN111172492A (en
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韩毅
李东宇
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Chongqing Saizhiyuan Gear Manufacturing Co ltd
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Yanshan University
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Priority to JP2021000150A priority patent/JP6932404B2/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • 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
    • C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like

Abstract

The invention provides a device and a method for carburizing the surface of a gear, the device comprises a plurality of carburizing furnaces and a foundation, wherein at least two carburizing furnaces are arranged on a slide rail of the foundation in parallel, each carburizing furnace comprises an inner wall and an outer wall, the outer wall is made of high-temperature resistant materials, a layer of heat preservation furnace pipe is wrapped outside the inner wall, a vacuum cavity is formed between the outer wall and the heat preservation furnace pipe, a carburizing bin is arranged inside each carburizing furnace, two supports are arranged in each carburizing bin, a carburizing groove is formed in each support, and the gear to be processed is placed in the carburizing groove. The recycling of the tail gas protects the environment, the design of wheels at the bottom of the carburizing furnace increases the flexibility of the equipment, and the high-temperature tail gas is heated and insulated in sequence in the three carburizing furnaces by monitoring the heating time and controlling the opening and closing of the servo valve, so that the real-time continuous control is realized.

Description

Device and method for gear surface carburization
Technical Field
The invention relates to the technical field of gear surface carburization, in particular to a device and a method for gear surface carburization.
Background
Carburizing is a chemical heat treatment process for increasing the carbon content of the surface layer of a steel part and forming a certain carbon concentration gradient, heating the steel part in a carburizing medium and preserving heat to make carbon atoms permeate into the surface layer, wherein during gas carburizing, the temperature in the furnace is not uniform, the atmosphere in the furnace is poor in circulation, the depth of a carburized layer is not uniform, the depth of the carburized layer on the surface of the gear is not uniform, the performance of different parts is discontinuous, weak areas are firstly damaged, then the whole gear is damaged, the service life of the gear is seriously influenced, when the existing carburizing furnace is used, basically, after carburizing and heating are finished, high-temperature gas in the furnace is directly discharged after being cooled, therefore, the gear heat treatment equipment has the problems of high energy consumption, high pollution and the like, so that the energy is greatly wasted, each furnace cannot be moved, and each furnace cannot be flexibly and effectively moved to a specified place.
Therefore, how to develop an intelligent energy-saving environment-friendly mobile carburizing treatment equipment furnace to meet the requirements of uniform carburizing of the surface of the gear and realizing real-time continuous control is a problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a device and a method for carburizing the surface of a gear, which are used for solving the problems in the prior art and developing an intelligent energy-saving environment-friendly movable carburizing treatment equipment furnace to meet the requirements of uniform carburizing of the surface of the gear and realizing real-time continuous control.
In order to achieve the purpose, the invention provides the following scheme:
the device comprises a plurality of carburizing furnaces and a foundation, wherein at least two carburizing furnaces are arranged on a slide rail of the foundation in parallel, each carburizing furnace comprises an inner wall and an outer wall, the outer wall is made of high-temperature resistant materials, a heat-preserving furnace pipe is wrapped outside the inner wall, a vacuum cavity is formed between the outer wall and the heat-preserving furnace pipe, a carburizing bin is arranged inside the carburizing furnace, two supports are arranged in the carburizing bin, a carburizing groove is formed in each support, and a gear to be processed is placed in the carburizing groove;
the system comprises a carburizing furnace, a first fan assembly, a second fan assembly, a first fan box, a second fan assembly, a second fan box, a stirring fan and a stirring motor, wherein the first fan assembly is arranged in the middle of the left side of the carburizing furnace;
the upper portion of each carburizing furnace is provided with a temperature probe respectively, and the left side upper portion of each carburizing furnace is provided with the air inlet, the air inlet is connected with the admission line, and the right side lower part of carburizing furnace is provided with the gas outlet, the gas outlet is connected with first pipeline and second pipeline or second pipeline, the admission line of next adjacent carburizing furnace of first pipe connection, a plurality of second pipelines are connected tail gas treatment case with the aid of a pipeline of ventilating, all be provided with the servo valve on admission line, first pipeline and the second pipeline, a plurality of servo valves and a plurality of temperature probes connect respectively and connect the upper controller, adjust valve opening's size separately through the feedback of furnace temperature in real time, realize the dynamic stability of furnace temperature.
Preferably, the power of the first fan assembly is greater than the power of the second fan assembly.
Preferably, the carburizing furnace includes a first carburizing furnace, a second carburizing furnace and a third carburizing furnace.
Preferably, be provided with first servo valve on the admission line of first carburizing furnace, be provided with the second servo valve on the admission line of second carburizing furnace, be provided with the third servo valve on the admission line of third carburizing furnace, be provided with the fourth servo valve on the second pipeline of first carburizing furnace, be provided with the fifth servo valve on the second pipeline of second carburizing furnace, be provided with the sixth servo valve on the second pipeline of third carburizing furnace.
Preferably, the bottom of the infiltration furnace is provided with a pulley matched with a foundation slide rail.
Preferably, the servo valve comprises a servo valve body, a servo motor arranged at the upper part of the servo valve body and pipe joints arranged at two sides of the servo valve body, two sides of the servo valve body are respectively connected with the pipe joints by means of a threaded pipe, and the pipe joints can be detachably connected with an air inlet pipeline or a second pipeline.
Preferably, high-temperature gas is introduced into the infiltration bin through a gas inlet pipeline, the high-temperature gas discharged from the previous infiltration furnace can enter the infiltration bin of the next infiltration furnace through the first pipeline and the gas inlet pipeline of the next adjacent infiltration furnace, and the opening and closing of a gas channel between the two adjacent infiltration furnaces can be controlled through the opening and closing of the servo valve.
Preferably, the present invention also provides a method of carburizing a gear surface, comprising the steps of:
s1, feeding the gear into a carburizing furnace, opening a first servo valve, and introducing factory tail gas into the first carburizing furnace;
s2, when the first carburizing furnace is heated to 880-920 ℃, the temperature measuring probe of the first carburizing furnace detects the temperature, and the second servo valve is opened;
s3, when the second carburizing furnace is heated to 780-820 ℃, the temperature measuring probe of the second carburizing furnace detects the temperature, and the third servo valve is opened;
s4, when the third carburizing furnace is heated to 680-720 ℃, the temperature probe of the third carburizing furnace detects the temperature, the sixth servo valve is opened, and the dynamic balance of the temperature in the furnace is realized by adjusting the size of the real-time opening of the servo valve;
s5, according to the reaction time T of the first carburizing furnaceASecond carburizing furnace reaction time TBAnd reaction time T of third carburizing furnaceCJudging the size of the product, and performing subsequent work;
s6, monitoring the reaction time and temperature of the carburizing furnace in real time, and then controlling the opening and closing of each servo valve; at TA＞TB＞TCWhen the heating time is up to TCWhen the temperature reaches the time T, the third servo valve is closed, the fifth servo valve is opened, the third carburizing furnace workpiece is taken out, the sixth servo valve is closed, and the time T is heatedBWhen the temperature reaches the time T, the second servo valve is closed, the fourth servo valve is opened, the second carburizing furnace workpiece is taken out, the fifth servo valve is closed, and the time T is heatedCWhen the work piece is processed, the first servo valve is closed, and the work piece of the first carburizing furnace is taken out;
at TB＞TA＞TCWhen the heating time is up to TCWhen the temperature reaches the time T, the third servo valve is closed, the fifth servo valve is opened, the third carburizing furnace workpiece is taken out, the sixth servo valve is closed, and the time T is heatedAWhen the temperature of the second carburizing furnace is reduced to the first temperature threshold value, the second servo valve and the fifth servo valve are closed, the workpiece of the first carburizing furnace is taken out, the first servo valve, the second servo valve and the fifth servo valve are opened, and when the temperature is heated to the time TBWhen the first and second servo valves are closed, taking out the workpiece of the second carburizing furnace;
at TA＞TC＞TBWhen the heating time is up to TBWhen the temperature of the third carburizing furnace is reduced to a second temperature threshold value, the third servo valve and the sixth servo valve are closed, the workpiece of the second carburizing furnace is taken out, the second servo valve, the third servo valve and the sixth servo valve are opened, the fourth servo valve is closed, and when the temperature is heated to the time TCWhen the third servo valve and the sixth servo valve are closed, the third carburizing furnace workpiece is taken out, the second servo valve is closed, the fourth servo valve is opened, and when the workpiece is heatedTo time TAWhen the first and the fourth servo valves are closed, taking out the workpiece of the first carburizing furnace;
at TC＞TA＞TBWhen the heating time is up to TBWhen the temperature of the third carburizing furnace is reduced to a second temperature threshold value, the third servo valve and the sixth servo valve are closed, the workpiece of the second carburizing furnace is taken out, the second servo valve, the third servo valve and the sixth servo valve are opened, the fourth servo valve is closed, and when the temperature is heated to the time TAWhen the temperature of the third carburizing furnace is reduced to 670 ℃, the second servo valve, the third servo valve and the sixth servo valve are closed, the first carburizing furnace workpiece is taken out, the first servo valve, the second servo valve, the third servo valve and the sixth servo valve are opened, and when the temperature is heated to the time TCWhen the work piece is processed, the first servo valve, the second servo valve and the third servo valve are closed, and the work piece of the third carburizing furnace is taken out;
at TC＞TB＞TAWhen the heating time is up to TAWhen the temperature of the second carburizing furnace is reduced to the first temperature threshold value, the second servo valve, the third servo valve and the sixth servo valve are closed, the first carburizing furnace workpiece is taken out, the first servo valve, the second servo valve, the third servo valve and the sixth servo valve are opened, and when the temperature is heated to the time TBWhen the temperature of the third carburizing furnace is reduced to a second temperature threshold value, the third servo valve and the sixth servo valve are closed, the second carburizing furnace workpiece is taken out, the first servo valve, the second servo valve, the third servo valve and the sixth servo valve are opened, and when the temperature is heated to the time TCWhen the work piece is processed, the first servo valve, the second servo valve and the third servo valve are closed, and the work piece of the third carburizing furnace is taken out;
at TB＞TC＞TAWhen the heating time is up to TAWhen the temperature of the second carburizing furnace is reduced to the first temperature threshold value, the second servo valve, the third servo valve and the sixth servo valve are closed, and the workpiece of the first carburizing furnace, the first servo valve, the second servo valve and the third servo valve are taken outAnd the sixth servo valve is opened when heating is carried out for a time TCWhen the temperature reaches the time T, the third servo valve and the sixth servo valve are closed, the third carburizing furnace workpiece is taken out, the fifth servo valve is opened, and the temperature is heated to the time TBWhen the first servo valve, the second servo valve and the fifth servo valve are closed, and the workpiece of the second carburizing furnace is taken out;
s7, after the heating is finished, feeding the three infiltration furnaces again, and continuing to perform the steps S1-S6.
Preferably, the first temperature threshold value ranges from 760 ℃ and 780 ℃, and the second temperature threshold value ranges from 660 ℃ and 680 ℃.
Compared with the prior art, the invention has the following technical effects:
1. the switch of the servo valve is controlled by monitoring the heating time and the temperature in the furnace in real time, and the dynamic balance and stability of the temperature in each furnace are realized by adjusting the size of the opening in real time by the servo valve, so that the high-temperature tail gas is sequentially heated and insulated in three carburizing furnaces, and the requirement of real-time continuous control is realized.
2. The continuous operation of the three fans, the turbulence of a high-power fan at the middle part of the left wall, the input of high-temperature tail gas by the fan at the lower part of the left wall and the output of high-temperature gas by the fan at the right wall form a dynamic high-temperature gas flow field surrounding the surface of the gear, and the vacuum design between the high-temperature heat-insulating material and the furnace pipe and the outer wall reduces the convection heat transfer and the heat conduction, increases the utilization rate of the high-temperature tail gas, effectively saves the use of an electric heating energy source in carburizing, greatly reduces the cost of carburizing the surface of the gear, and protects the environment from being polluted.
3. The circulating recycling of high-temperature tail gas is realized through the opening and closing of the servo valve, the more the furnaces are, the higher the heat utilization rate is, the effective carburizing cost is reduced, and the design of the wheels at the bottom of each carburizing furnace enables the carburizing furnace to move to a desired appointed place, so that the flexibility of carburizing treatment is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a front cross-sectional view of an apparatus for carburizing the surface of a gear according to the present invention;
FIG. 2 is a schematic cross-sectional view of a servo valve of the present invention;
FIG. 3 is a schematic view of a high temperature gas flow field of the present invention; and
FIG. 4 is a schematic view of the cyclic operation method of the present invention.
Some of the reference numbers in the figures are as follows:
the device comprises wheels 1, a bottom plate support 2, a heat preservation furnace container 3, an outer wall 4, a fan box 5, an agitation fan 6, an agitation motor 7, a first servo valve 8, a carburizing furnace 9, a temperature measuring probe 10, a second servo valve 11, a carburizing tank 12, a gear mounting shaft 13, a third servo valve 14, high-temperature gas 15, a gear to be processed 16, a support 17, a tail gas treatment box 18, a sixth servo valve 19, a vent pipeline 20, a fifth servo valve 21, a fourth servo valve 22, a threaded pipe 23, a pipe joint 24, a servo valve joint 25 and a servo motor 26.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The invention aims to provide a device and a process for carburizing the surface of a gear, which are used for solving the problems in the prior art and developing an intelligent energy-saving environment-friendly movable carburizing treatment equipment furnace to meet the requirements of uniform carburizing of the surface of the gear and realizing accurate control in a time-sharing and sectional manner.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1-4, wherein fig. 1 is a front cross-sectional view of the apparatus for carburizing the surface of a gear according to the present invention, fig. 2 is a schematic cross-sectional view of a servo valve according to the present invention, and the structure of the rest of the servo valves is consistent therewith. Fig. 3 is a schematic view of a high-temperature gas flow field of the present invention, and fig. 4 is a schematic view of a circulation operation method of the present invention.
Specifically, the invention provides a device for carburizing the surface of a gear, which comprises a plurality of carburizing furnaces 9 and a foundation, wherein at least two carburizing furnaces are arranged on a slide rail of the foundation in parallel. The bottom of the infiltration furnace is provided with wheels 1 matched with the foundation slide rails. The bottom plate support 2 is arranged above the wheels 1, and the bottom plate support 2 is used for supporting the whole furnace body.
Carburizing furnace 9 includes inner wall and outer wall 4, and outer wall 4 comprises high temperature resistant material, and the outside parcel of inner wall has one deck heat preservation stove courage 3, has one between outer wall 4 and the heat preservation stove courage 3 to be taken out into the vacuous cavity, and carburizing furnace 9 is inside to be provided with a carburization storehouse 91, is provided with two supports 17 in the carburization storehouse 91, is provided with a carburization groove 12 on two supports 17, waits to process gear 16 and places in carburization groove 12 with the help of gear installation axle 13.
As shown in fig. 3, a first fan assembly 93 is arranged in the middle of the left side of the carburizing furnace 9, a second fan assembly 92 is respectively arranged on the lower portion of the left side and the upper portion of the right side of the carburizing furnace 9, each of the first fan assembly 93 and the second fan assembly 92 comprises a fan box 5, an agitation fan 6 and an agitation motor 7, the fan box 5 is arranged on the outer side of the outer wall of the carburizing furnace, the agitation motor 7 is arranged inside the fan box 5, the agitation fan 6 is arranged inside the carburizing furnace, and the output shaft of the agitation motor 7 extends into the carburizing furnace and is connected with the agitation fan 6.
Preferably, the power of the first fan assembly is greater than the power of the second fan assembly. When the high-power carburizing furnace is used, the high power of the first fan assembly plays a role in stirring flow, so that the carburizing is uniform, and the other two low-power fans respectively guide gas to enter and discharge from the carburizing furnace. Therefore, the power of the fan assembly for stirring flow can play the role of maximum stirring and act on the whole furnace. FIG. 3 indicates the gas flow direction in the carburizing furnace.
The upper part of each carburizing furnace is respectively provided with a temperature measuring probe 10, the upper part of the left side of each carburizing furnace is provided with an air inlet, the air inlet is connected with an air inlet pipeline 101, the lower part of the right side of the carburizing furnace is provided with an air outlet, the air outlet is connected with a first pipeline 102 and a second pipeline 103 or is only connected with one second pipeline 103, the air outlets of the front plurality of carburizing furnaces are connected with the first pipeline 102 and the second pipeline 103, and the last carburizing furnace is only connected with the second pipeline 103.
During the specific application, the inlet duct of next adjacent carburizing furnace is connected to first pipeline, and a plurality of second pipelines are connected tail gas treatment box 18 with the help of an air duct 20, all are provided with the servo valve on inlet duct, first pipeline and the second pipeline, and a plurality of servo valves and a plurality of temperature probe connect the upper controller respectively, and the dynamic stability of furnace temperature is realized to the size of valve opening separately of feedback regulation through furnace temperature in real time.
Preferably, in this embodiment, the carburizing furnace includes a first carburizing furnace, a second carburizing furnace, and a third carburizing furnace.
Preferably, a first servo valve 8 is arranged on an air inlet pipeline of the first carburizing furnace, a second servo valve 11 is arranged on an air inlet pipeline of the second carburizing furnace, a third servo valve 14 is arranged on an air inlet pipeline of the third carburizing furnace, a fourth servo valve 22 is arranged on a second pipeline of the first carburizing furnace, a fifth servo valve 21 is arranged on a second pipeline of the second carburizing furnace, and a sixth servo valve 19 is arranged on a second pipeline of the third carburizing furnace.
Preferably, as shown in fig. 2, the servo valve includes a servo valve body 200, a servo motor 26 disposed at an upper portion of the servo valve body, and pipe joints 24 disposed at both sides of the servo valve body, both sides of the servo valve body 200 are connected to the pipe joints 24 by means of one threaded pipe 23, respectively, and the pipe joints 24 are detachably connected to the intake pipe or the second pipe. The servo valve body 200 and the threaded pipe 23 are directly connected by means of the servo valve joint 25.
High-temperature gas 15 is introduced into the infiltration bin through a gas inlet pipeline, the high-temperature gas discharged from the previous infiltration furnace can enter the infiltration bin of the next infiltration furnace through a gas channel formed by the first pipeline and the gas inlet pipeline of the next adjacent infiltration furnace, and the opening and closing of the gas channel between the two adjacent infiltration furnaces can be controlled through the opening and closing of the servo valve. In specific application, a gas channel can be formed between 2 or more than 2 infiltration furnaces by controlling the opening and closing of different servo valves, so that the high-temperature tail gas discharged from the previous infiltration furnace enters the next infiltration furnace, or the high-temperature tail gas can be discharged into the tail gas treatment box 18 through the servo valves.
The invention also provides a process for carburizing the surface of the gear, which comprises the following steps:
and S1, feeding the gear into a carburizing furnace, opening the first servo valve 8, and introducing factory tail gas, namely high-temperature gas into the first carburizing furnace.
S2, when the first carburizing furnace is heated to 880-920 ℃, preferably 900 ℃, the temperature probe of the first carburizing furnace detects the temperature, and the second servo valve 11 is opened.
S3, when the second carburizing furnace is heated to 780-820 ℃, preferably 800 ℃, the temperature probe of the second carburizing furnace detects the temperature, and the third servo valve 14 is opened.
S4, when the third carburizing furnace is heated to 680-720 ℃, preferably 700 ℃, the temperature measuring probe of the third carburizing furnace detects the temperature, the sixth servo valve 19 is opened, and the servo valve realizes the dynamic balance of the temperature in the furnace through the adjustment of the real-time opening size.
S5, reaction time T of the first carburizing furnaceASecond carburizing furnace reaction time TBAnd reaction time T of third carburizing furnaceCJudging the size of the product, and performing subsequent work; the reaction time of each furnace body can be set according to requirements.
And S6, monitoring the reaction time and temperature of the carburizing furnace in real time, and then controlling the opening and closing of each servo valve, wherein a complete path is ensured to be realized for the high-temperature tail gas because of real-time dynamic balance.
At TA＞TB＞TCWhen the heating time is up to TCWhen the temperature reaches the time T, the third servo valve 14 is closed, the fifth servo valve 21 is opened, the high-temperature tail gas passes through one passage of the first infiltration furnace and the second infiltration furnace, the workpiece of the third infiltration furnace is taken out, the sixth servo valve 19 is closed, and when the temperature reaches the time TBWhen the second servo valve 11 is closed, the fourth servo valve 22 is opened, so that the high-temperature gas passes through the passage of the first carburizing furnace, and the workpiece of the second carburizing furnace is taken outThe fifth servo valve 21 is closed and when heating up to time TCAnd when the first servo valve 8 is closed, stopping introducing the high-temperature gas and taking out the first carburizing furnace workpiece.
At TB＞TA＞TCWhen the heating time is up to TCWhen the temperature reaches the time T, the third servo valve 14 is closed, the fifth servo valve 21 is opened, the high-temperature tail gas discharged by the first infiltration furnace passes through a gas passage formed between the first infiltration furnace and the second infiltration furnace, the workpiece of the third infiltration furnace is taken out, the sixth servo valve 19 is closed, and when the temperature reaches the time T, the workpiece of the third infiltration furnace is heatedAWhen the temperature of the second carburizing furnace begins to drop and drops to 760-780 ℃, preferably 770 ℃, the first servo valve 8 is closed, the high-temperature tail gas of the first carburizing furnace is discharged into the second carburizing furnace, the second servo valve 11 and the fifth servo valve 21 are closed, the workpiece of the first carburizing furnace is taken out, the first servo valve 8, the second servo valve 11 and the fifth servo valve 21 are opened, the high-temperature tail gas passes through a gas passage between the first carburizing furnace and the second carburizing furnace, and when the temperature is heated to the time T, the high-temperature tail gas passes through the gas passage between the first carburizing furnace and the second carburizing furnaceBAt this time, the first servo valve 8 and the second servo valve 11 are closed, and the second carburizing furnace workpiece is taken out.
At TA＞TC＞TBWhen the heating time is up to TBWhen the temperature of the third carburizing furnace begins to drop and drops to 660-minus 680 ℃, preferably 670 ℃, the second servo valve 11 is closed, the fourth servo valve 22 is opened, the high-temperature tail gas of the second carburizing furnace is shown to be discharged into the third carburizing furnace, the third servo valve 14 and the sixth servo valve 19 are closed, the workpiece of the second carburizing furnace is taken out, the second servo valve 11, the third servo valve 14 and the sixth servo valve 19 are opened, the fourth servo valve 22 is closed, the high-temperature tail gas is enabled to pass through a gas passage between the first carburizing furnace, the second carburizing furnace and the third carburizing furnace, and the heating is carried out for time TCWhen the temperature reaches the time T, the third servo valve and the sixth servo valve are closed, the third carburizing furnace workpiece is taken out, the second servo valve is closed, the fourth servo valve is opened, and when the temperature reaches the time TAAt this time, the first servo valve 8 and the fourth servo valve 22 are closed, and the first carburizing furnace workpiece is taken out.
At TC＞TA＞TBWhen the heating time is up to TBWhen the temperature of the water is higher than the set temperature,the second servo valve 11 is closed, the fourth servo valve 22 is opened, when the temperature of the third carburizing furnace begins to drop and drops to 660-DEG C and 680 ℃, preferably 670 ℃, the high-temperature tail gas of the second carburizing furnace is discharged into the third carburizing furnace, the third servo valve 14 and the sixth servo valve 19 are closed, the workpiece of the second carburizing furnace is taken out, the second servo valve 11, the third servo valve 14 and the sixth servo valve 19 are opened, the fourth servo valve 22 is closed, and when the temperature is heated to the time TAWhen the temperature of the third carburizing furnace begins to drop and drops to 660-minus 680 ℃, preferably 670 ℃, the first servo valve 8 is closed, the high-temperature tail gas of the first carburizing furnace is discharged into the third carburizing furnace, the second servo valve 11, the third servo valve 14 and the sixth servo valve 19 are closed, the workpiece of the first carburizing furnace is taken out, the first servo valve 8, the second servo valve 11, the third servo valve 14 and the sixth servo valve 19 are opened, and when the temperature is heated to the time TCAt this time, the first servo valve 8, the second servo valve 11, and the third servo valve 14 are closed, and the third carburizing furnace workpiece is taken out.
At TC＞TB＞TAWhen the heating time is up to TAWhen the temperature of the second carburizing furnace begins to drop and drops to 760-780 ℃, preferably 770 ℃, the first servo valve 8 is closed, the high-temperature tail gas of the first carburizing furnace is discharged into the second carburizing furnace, the second servo valve 11, the third servo valve 14 and the sixth servo valve 19 are closed, the workpiece of the first carburizing furnace is taken out, the first servo valve 8, the second servo valve 11, the third servo valve 14 and the sixth servo valve 19 are opened, and when the temperature is heated to the time TBWhen the temperature of the third carburizing furnace begins to drop and drops to 660-680 ℃, preferably 670 ℃, the high-temperature tail gas of the second carburizing furnace is shown to be discharged into the third carburizing furnace, the third servo valve 14 and the sixth servo valve are closed, the workpiece of the second carburizing furnace is taken out, the first servo valve 8, the second servo valve 11, the third servo valve 14 and the sixth servo valve 19 are opened, and when the temperature is heated to the time TCAt this time, the first servo valve 8, the second servo valve 11, and the third servo valve 14 are closed, and the third carburizing furnace workpiece is taken out.
At TB＞TC＞TAWhen the heating time is up to TAWhen it is, firstThe servo valve 8 is closed, when the temperature of the second carburizing furnace begins to drop and drops to 760-780 ℃, preferably 770 ℃, the high-temperature tail gas of the first carburizing furnace is shown to be discharged into the second carburizing furnace, the second servo valve 11, the third servo valve 14 and the sixth servo valve 19 are closed, the workpiece of the first carburizing furnace is taken out, the first servo valve 8, the second servo valve 11, the third servo valve 14 and the sixth servo valve 19 are opened, and when the temperature is heated to the time TCWhen the temperature reaches the time T, the third servo valve 14 and the sixth servo valve 19 are closed, the workpiece of the third carburizing furnace is taken out, the fifth servo valve is opened, the high-temperature tail gas passes through the gas passage between the first carburizing furnace and the second carburizing furnace, and the temperature is heated to the time TBAt this time, the first servo valve 8, the second servo valve 11 and the fifth servo valve 21 are closed, and the second carburizing furnace workpiece is taken out.
S7, after heating, re-feeding, continuing to perform the steps S1-S6, and starting the next round of work.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims (6)

1. A method for carburizing a gear surface is characterized in that: the method for carburizing the surface of the gear is based on a device for carburizing the surface of the gear, the device for carburizing the surface of the gear comprises a plurality of carburizing furnaces and a foundation, wherein at least two carburizing furnaces are arranged on a slide rail of the foundation in parallel, each carburizing furnace comprises an inner wall and an outer wall, the outer wall is made of high-temperature resistant materials, a layer of heat preservation furnace pipe is wrapped outside the inner wall, a vacuum cavity is formed between the outer wall and the heat preservation furnace pipe, a carburizing bin is arranged inside each carburizing furnace, two supports are arranged in each carburizing bin, a carburizing groove is formed in each support, and the gear to be machined is placed in the carburizing groove;
the system comprises a carburizing furnace, a first fan assembly, a second fan assembly, a first fan box, a second fan assembly, a second fan box, a stirring fan and a stirring motor, wherein the first fan assembly is arranged in the middle of the left side of the carburizing furnace;
the upper part of each carburizing furnace is respectively provided with a temperature measuring probe, the upper part of the left side of each carburizing furnace is provided with an air inlet, the air inlet is connected with an air inlet pipeline, the lower part of the right side of the carburizing furnace is provided with an air outlet, the air outlet is connected with a first pipeline and a second pipeline or a second pipeline, the first pipeline is connected with the air inlet pipeline of the next adjacent carburizing furnace, the second pipelines are connected with a tail gas treatment box by virtue of an air duct, the air inlet pipeline, the first pipeline and the second pipeline are respectively provided with a servo valve, the servo valves and the temperature measuring probes are respectively connected with an upper controller, and the size of the opening of each valve is adjusted by the feedback of the temperature in the furnace in real time, so that the dynamic stability of the temperature in;
the carburizing furnace comprises a first carburizing furnace, a second carburizing furnace and a third carburizing furnace; a first servo valve is arranged on an air inlet pipeline of the first carburizing furnace, a second servo valve is arranged on an air inlet pipeline of the second carburizing furnace, a third servo valve is arranged on an air inlet pipeline of the third carburizing furnace, a fourth servo valve is arranged on a second pipeline of the first carburizing furnace, a fifth servo valve is arranged on a second pipeline of the second carburizing furnace, and a sixth servo valve is arranged on a second pipeline of the third carburizing furnace;
the method for carburizing the surface of the gear comprises the following steps:
s1, feeding the gear into a carburizing furnace, opening a first servo valve, and introducing factory tail gas into the first carburizing furnace;
s2, when the first carburizing furnace is heated to 880-920 ℃, the temperature measuring probe of the first carburizing furnace detects the temperature, and the second servo valve is opened;
s3, when the second carburizing furnace is heated to 780-820 ℃, the temperature measuring probe of the second carburizing furnace detects the temperature, and the third servo valve is opened;
s4, when the third carburizing furnace is heated to 680-720 ℃, the temperature probe of the third carburizing furnace detects the temperature, the sixth servo valve is opened, and the dynamic balance of the temperature in the furnace is realized by adjusting the size of the real-time opening of the servo valve;
s5, according to the reaction time T of the first carburizing furnaceASecond carburizing furnace reaction time TBAnd reaction time T of third carburizing furnaceCJudging the size of the product, and performing subsequent work;
s6, monitoring the reaction time and temperature of the carburizing furnace in real time, and then controlling the opening and closing of each servo valve; at TA＞TB＞TCWhen the heating time is up to TCWhen the temperature reaches the time T, the third servo valve is closed, the fifth servo valve is opened, the third carburizing furnace workpiece is taken out, the sixth servo valve is closed, and the time T is heatedBWhen the temperature reaches the time T, the second servo valve is closed, the fourth servo valve is opened, the second carburizing furnace workpiece is taken out, the fifth servo valve is closed, and the time T is heatedAWhen the work piece is processed, the first servo valve is closed, and the work piece of the first carburizing furnace is taken out;
at TB＞TA＞TCWhen the heating time is up to TCWhen the temperature reaches the time T, the third servo valve is closed, the fifth servo valve is opened, the third carburizing furnace workpiece is taken out, the sixth servo valve is closed, and the time T is heatedAWhen the temperature of the second carburizing furnace is reduced to the first temperature threshold value, the second servo valve and the fifth servo valve are closed, the workpiece of the first carburizing furnace is taken out, the first servo valve, the second servo valve and the fifth servo valve are opened, and when the temperature is heated to the time TBWhen the first and second servo valves are closed, taking out the workpiece of the second carburizing furnace;
at TA＞TC＞TBWhen the heating time is up to TBWhen the temperature of the third carburizing furnace is reduced to a second temperature threshold value, the third servo valve and the sixth servo valve are closed, and the workpiece of the second carburizing furnace, the second servo valve, the third servo valve and the sixth servo valve are taken outOpen, the fourth servo valve is closed, when heating to the time TCWhen the temperature reaches the time T, the third servo valve and the sixth servo valve are closed, the third carburizing furnace workpiece is taken out, the second servo valve is closed, the fourth servo valve is opened, and when the temperature reaches the time TAWhen the first and the fourth servo valves are closed, taking out the workpiece of the first carburizing furnace;
at TC＞TA＞TBWhen the heating time is up to TBWhen the temperature of the third carburizing furnace is reduced to a second temperature threshold value, the third servo valve and the sixth servo valve are closed, the workpiece of the second carburizing furnace is taken out, the second servo valve, the third servo valve and the sixth servo valve are opened, the fourth servo valve is closed, and when the temperature is heated to the time TAWhen the temperature of the third carburizing furnace is reduced to a second temperature threshold value, the second servo valve, the third servo valve and the sixth servo valve are closed, the first carburizing furnace workpiece is taken out, the first servo valve, the second servo valve, the third servo valve and the sixth servo valve are opened, and when the temperature is heated to the time TCWhen the work piece is processed, the first servo valve, the second servo valve and the third servo valve are closed, and the work piece of the third carburizing furnace is taken out;
at TC＞TB＞TAWhen the heating time is up to TAWhen the temperature of the second carburizing furnace is reduced to the first temperature threshold value, the second servo valve, the third servo valve and the sixth servo valve are closed, the first carburizing furnace workpiece is taken out, the first servo valve, the second servo valve, the third servo valve and the sixth servo valve are opened, and when the temperature is heated to the time TBWhen the temperature of the third carburizing furnace is reduced to a second temperature threshold value, the third servo valve and the sixth servo valve are closed, the second carburizing furnace workpiece is taken out, the first servo valve, the second servo valve, the third servo valve and the sixth servo valve are opened, and when the temperature is heated to the time TCWhen the work piece is processed, the first servo valve, the second servo valve and the third servo valve are closed, and the work piece of the third carburizing furnace is taken out;
at TB＞TC＞TAWhen the heating time is up to TATime, first servo valveClosing the first carburizing furnace, closing the second servo valve, the third servo valve and the sixth servo valve when the temperature of the second carburizing furnace is reduced to the first temperature threshold value, taking out the first carburizing furnace workpiece, opening the first servo valve, the second servo valve, the third servo valve and the sixth servo valve, and heating for time TCWhen the temperature reaches the time T, the third servo valve and the sixth servo valve are closed, the third carburizing furnace workpiece is taken out, the fifth servo valve is opened, and the temperature is heated to the time TBWhen the first servo valve, the second servo valve and the fifth servo valve are closed, and the workpiece of the second carburizing furnace is taken out;
s7, after the heating is finished, feeding the three infiltration furnaces again, and continuing to perform the steps S1-S6.
2. The method of carburizing a gear surface according to claim 1, characterized in that: the power of the first fan assembly is greater than the power of the second fan assembly.
3. The method of carburizing a gear surface according to claim 1, characterized in that: and pulleys matched with the foundation slide rails are arranged at the bottom of the carburizing furnace.
4. The method of carburizing a gear surface according to claim 1, characterized in that: the servo valve comprises a servo valve body, a servo motor arranged on the upper portion of the servo valve body and pipe joints arranged on two sides of the servo valve body, two sides of the servo valve body are connected with the pipe joints through threaded pipes respectively, and the pipe joints can be detachably connected with an air inlet pipeline or a second pipeline.
5. The method of carburizing a gear surface according to claim 4, characterized in that: high-temperature gas is introduced into the carburizing bin through a gas inlet pipeline, the high-temperature gas discharged from the previous permeating furnace can enter the permeating bin of the next permeating furnace through the first pipeline and the gas inlet pipeline of the next adjacent permeating furnace, and the opening and closing of a gas channel between the two adjacent permeating furnaces can be controlled through the opening and closing of the servo valve.
6. The method of carburizing a gear surface according to claim 1, characterized in that: the first temperature threshold value ranges from 760 ℃ and 780 ℃, and the second temperature threshold value ranges from 660 ℃ and 680 ℃.
CN202010005736.3A 2020-01-03 2020-01-03 Device and method for gear surface carburization Active CN111172492B (en)

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JPS60161164U (en) * 1984-04-05 1985-10-26 マツダ株式会社 gas carburizing furnace
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