CN107916391A - Engine shields special tooling with cylinder sleeve glow discharge nitriding technique and non-nitriding position - Google Patents
Engine shields special tooling with cylinder sleeve glow discharge nitriding technique and non-nitriding position Download PDFInfo
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- CN107916391A CN107916391A CN201610881337.7A CN201610881337A CN107916391A CN 107916391 A CN107916391 A CN 107916391A CN 201610881337 A CN201610881337 A CN 201610881337A CN 107916391 A CN107916391 A CN 107916391A
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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
- C23C8/36—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 using ionised gases, e.g. ionitriding
- C23C8/38—Treatment of ferrous surfaces
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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
- C23C8/04—Treatment of selected surface areas, e.g. using masks
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Special tooling is shielded with cylinder sleeve glow discharge nitriding technique and non-nitriding position the present invention provides a kind of engine, including S01 workpiece are dissolved before glow discharge nitriding and ageing treatment；S02 treats glow discharge nitriding workpiece and carries out cleaning treatment；The non-nitriding position of workpiece is shielded using special tooling during S03 glow discharge nitridings；S04 assembles workpiece and special tooling, is placed into ion nitriding furnace vacuum tank, and vacuum tank the interior of the body belonging to YIN pole, vacuum vessel wall is anode；Close the burner hearth of ion nitriding furnace and start vacuum pump vacuum；S05 is filled with the nitrogen hydrogen mixeding gas of required pressure when vacuum is evacuated to and sets numerical value in advance；S06 adds high voltage pulse DC power supply between the cathode and anode of vacuum tank；The present invention can not only improve cylinder liner surface wearability and corrosion resistance, can also omit later stage grinding program, improve production efficiency and product quality.
Description
Technical field
The present invention relates to a kind of method of steel-iron components Surface heat-treatent, a kind of engine cylinder sleeve ion is specifically related to
Nitridation process and non-nitriding position shielding special tooling.
Background technology
Cylinder sleeve is one of important part of engine, its performance quality directly affects the service life of engine.And
The working environment of engine cylinder sleeve is more severe, it is the reciprocating motion with piston ring under oil-free dry friction environment, due to
Piston ring packing pressure and side thrust of piston are acted directly on cylinder liner internal wall, cylinder liner-piston group is subject to strong rub
Wipe, therefore can generally select two phase stainless steel as cylinder jacket material, it is possible to increase cylinder sleeve movement pair surface must have superpower
Wearability and corrosion resistance, but this friction is in semi-dry friction state, especially in insufficient lubrication, air inlet is dirty, cools down not
When abnormal with burning, the strong wear of cylinder liner-piston group is be easy to cause, so requiring to have to inner surface of cylinder liner
There are high hardness, wearability, corrosion stability and high thermal fatigue resistance intensity etc..
All it is that Nitrizing Treatment is carried out to cylinder liner internal wall by nitridation process for a long time at present to reach aforementioned claim,
Effectively strengthen case hardness, improve wearability.And although glow discharge nitriding technique improves cylinder surface hardness, have superpower
Wearability, but in nitration case there is more CrN to separate out, cause the chromium depleted phenomenon of nitriding layer matrix, destroy two-phase stainless
The corrosion resisting property of steel, and cylinder sleeve nitriding layer surface easily produces corrosion phenomena so that cylinder sleeve friction in pairs degradation, causes
Engine acc power declines, or even cylinder sleeve part failure.
Therefore, how to improve in the basic units such as nitriding layer case hardness, wearability, and CrN in nitriding layer can be controlled
Separate out, ensure good corrosion resistance, meet engine with the requirement of cylinder sleeve be those skilled in the art be badly in need of solve
Problem.
The content of the invention
The object of the present invention is to provide a kind of engine cylinder sleeve glow discharge nitriding technique, controls the precipitation of CrN in nitriding layer,
Cylinder sleeve movement pair surface wearability and corrosion resistance are improved, and without carrying out grinding to nitriding layer again after glow discharge nitriding, only
Nitriding layer need to be processed by shot blasting, simplify cylinder sleeve production technology program, shorten nitriding soaking time, significantly carry
The production efficiency of high cylinder sleeve, improves product quality, shortens the production cycle.
Another object of the present invention, which provides, carries out cylinder sleeve in a kind of glow discharge nitriding technique non-nitriding position shielding
Special tooling, is not only simple in structure, moreover it is possible to is effectively prevented from non-nitriding region or small structure deforms, more optimizedly avoid
Sharp angle effect is produced in nitriding process.
Technical solution provided by the invention is as follows：
A kind of engine cylinder sleeve glow discharge nitriding technique, including：
S01, workpiece are dissolved before glow discharge nitriding and ageing treatment；
S02, carry out cleaning treatment to the workpiece；
The non-nitriding position of the workpiece is shielded using special tooling when S03, glow discharge nitriding；
S04, assemble the workpiece and the special tooling, is placed into the ion nitriding furnace vacuum tank, institute
Vacuum tank the interior of the body belonging to YIN pole is stated, the chamber wall of the vacuum tank is anode, closes the burner hearth of ion nitriding furnace and starts vacuum
Pump carries out vacuum；
S05, be filled with when vacuum is evacuated to numerical value set in advance needed for pressure nitrogen hydrogen mixeding gas；
S06, add high voltage pulse DC power supply, two interpolar low density gases between the cathode and anode of the vacuum tank
It is ionized and produces glow discharge, the anode surface of cation towards the vacuum tank of hydrogen and nitrogen accelerates, and bombards the workpiece
Surface, it is nitrogen-atoms, the nitrogen-atoms and the workpiece surface that the cathode of Nitrogen ion from the vacuum tank, which captures electron reduction,
The iron atom pounded combines, and forms FeN and deposition forms nitriding layer on the surface of the workpiece.
Preferably, the temperature being dissolved described in step S01 is 1030 DEG C~1050 DEG C, soaking time 1h~2h, and logical
Oil cooling or water cooling is crossed to be cooled down；
And/or；
The temperature of timeliness described in step S01 is 560 DEG C~520 DEG C, soaking time 4h~8h.
By energy homogeneous material tissue after solution treatment in the technical program, be conducive to subsequent ion Nitrizing Treatment.At the same time
By when validity response purpose be eliminate inside workpiece residual stress, be conducive to the size distortion control before and after workpiece glow discharge nitriding
System.
Preferably, cleaning way uses ultrasonic wave in step S02, and the frequency of the ultrasonic wave is 28KHZ~40KHZ,
Cleaning solution removes oil solution for aqua.
In the technical program, the purpose cleaned using ultrasonic wave is to remove workpiece surface oil stain and impurity, keep away
Exempt to beat arc due to greasy dirt in nitriding process, so as to cause pit defect to workpiece surface.
Preferably, after the assembling of the workpiece described in step S04 and the special tooling, close burner hearth and start vacuum pump into
Row vacuum, temperature control in the specific burner hearth is at 420 DEG C~490 DEG C, nitriding time 4h~8h, nitriding pressure 240Pa
~280Pa.
Nitriding soaking time can effectively be shortened in the technical program, increase substantially the production efficiency of cylinder sleeve, improved
Product quality, shortens the production cycle.
Preferably, it is less than 10Pa that vacuum, which is evacuated to numerical value set in advance, in step S05, it is ensured that in absolute vacuum
In the environment of carry out Nitrizing Treatment, effectively improve treatment effect.
Preferably, the nitriding layer case hardness is HV1000~HV1200, and depth of penetration is 0.02mm~0.10mm.
The technical program can effectively improve cylinder sleeve hardness, wearability, corrosion stability and height by above-mentioned nitridation process
Thermal fatigue resistance intensity the features such as.
Preferably, using thermocouple temperature measurement system control nitriding temperature in glow discharge nitriding technical process, using infrared survey
Workpiece surface temperature described in warm system monitoring.
Nitriding temperature is controlled by thermocouple temperature measurement system in the technical program, while work is monitored by infrared temperature measurement system
Part surface temperature, efficiently controls the temperature in whole nitridation process, improves cylinder sleeve production efficiency, improves product quality, shortens
Production cycle.
Present invention also offers a kind of non-nitriding position shielding special tooling, including：
Sleeve, the sleeve include the outer sleeve being set on the outside of workpiece and the inner sleeve being arranged on the inside of workpiece；
The outer sleeve includes upper bush and lower sleeve, the inner wall of the upper bush and the lower sleeve with outside the workpiece
Wall contacts；
The non-nitriding position of the workpiece is shielded by the outer sleeve and the inner sleeve.
In the technical program, realized by the sleeve of setting and the non-nitriding portion of cylinder sleeve is shielded, avoid Nitrizing Treatment
When the part that need not carry out Nitrizing Treatment is protected.
Preferably, there is gap, the gap size is 0.4mm between the outer wall of the inner sleeve and the workpiece inner wall
~0.6mm.
In the technical program, by the gap setting between the outer wall and inboard wall of cylinder liner of inner sleeve 0.4mm~0.6mm it
Between, occur to beat arc phenomenon when can be effectively prevented from Nitrizing Treatment.
Preferably, a base for being used to support the workpiece and the special tooling is further included, one end of the base is embedding
Enter in the workpiece, other end outer wall is flushed with the outer wall of the outer sleeve.
The support to whole cylinder sleeve and special tooling is realized by the base of setting in the technical program, moreover it is possible to by with set
The airflow design of cylinder, makes nitriding source of the gas in nitriding process (i.e. nitrogen, hydrogen) more smooth by cylinder sleeve inside workpiece, avoids at the same time
Sharp angle effect is produced in nitriding process.
A kind of engine provided by the invention shields special tooling with cylinder sleeve glow discharge nitriding technique and non-nitriding position, can
Bring a kind of following beneficial effect：
1st, the present invention glow discharge nitriding technique in, before glow discharge nitriding by solid solution and ageing treatment, can after can
Even material structure, is conducive to subsequent ion Nitrizing Treatment, additionally it is possible to eliminates inside workpiece residual stress, is conducive to workpiece ion and oozes
Size distortion control before and after nitrogen.Only needed after glow discharge nitriding without carrying out grinding to nitriding layer again after example nitriding
Nitriding layer is processed by shot blasting, compared with conventional ion nitridation process, cylinder sleeve production process route is simplified, shortens
Nitriding soaking time, can increase substantially the production efficiency of cylinder sleeve of engine, improve product quality, shorten the production cycle.
2nd, in the glow discharge nitriding technique of the present invention, by workpiece, that is, cylinder sleeve and the special tooling that therewith cooperates into luggage
Match somebody with somebody, be placed on after assembling in the container of vacuum, finally place and heated in heating furnace, so make it in heating by special
The non-nitriding part of workpiece is protected with frock, the part of Nitrizing Treatment need not be carried out unavoidably by Nitrizing Treatment, raising processing
Accuracy.
3rd, workpiece and special tooling are placed in vacuum tank cathode in the present invention, and the chamber wall of vacuum tank is sun
Pole, in the case of being so powered at the two poles of the earth, two interpolar low density gases (i.e. nitrogen, hydrogen) are ionized and produce glow discharge, in electricity
Under the action of, the anode surface of cation towards the vacuum tank of hydrogen and nitrogen accelerates strongly, bombardment workpiece surface, generation sputtering,
Heating and suction-operated, it is nitrogen-atoms, nitrogen-atoms and workpiece surface quilt that Nitrogen ion captures electron reduction from the cathode of vacuum tank
The iron atom pounded combines, and forms FeN and deposition forms nitriding layer on the surface of the workpiece, with the extension of time, nitrogen-atoms
Inwardly spread from workpiece surface, complete glow discharge nitriding process.Nitriding layer case hardness can improved, in the basic unit such as wearability,
The precipitation of CrN in nitriding layer can be controlled again, ensures good corrosion resistance, meet the requirement of engine cylinder sleeve.
4th, the special tooling set in the present invention is simple in structure, easy for installation, meets what non-nitriding position was shielded
On the basis of, it is effectively prevented from inner hole of workpiece and larger deformation occurs, influences the using effect in later stage, more optimizedly avoid nitriding
Occur to beat arc phenomenon in journey.
5th, the support to whole cylinder sleeve and special tooling is further met in the present invention by the base of setting, moreover it is possible to logical
The airflow design with sleeve is crossed, makes nitriding source of the gas in nitriding process (i.e. nitrogen, hydrogen) more smooth by cylinder sleeve inside workpiece, together
When avoid producing sharp angle effect in nitriding process.
Brief description of the drawings
Below by a manner of clearly understandable, preferred embodiment is described with reference to the drawings, a kind of non-nitriding position is shielded
Above-mentioned characteristic, technical characteristic, advantage and its implementation of special tooling are further described.
Fig. 1 is the non-nitriding position shielding special tooling of the present invention and the structure diagram after workpiece assembling；
Fig. 2 is the cross section view on A-A directions in Fig. 1；
Fig. 3 is the structure diagram that the non-nitriding position shielding special tooling of the present invention is connected with thermocouple.
Drawing reference numeral explanation：
Gap d；
Special tooling 100；Outer sleeve 101；Upper bush 1011；Lower sleeve 1012；Inner sleeve 102；Base 103；
Workpiece 200；
Thermocouple 300；Porcelain bushing shell 400.
Embodiment
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, control is illustrated below
The embodiment of the present invention.It should be evident that drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, without creative efforts, other can also be obtained according to these attached drawings
Attached drawing, and obtain other embodiments.
In the embodiment of the present invention one, engine cylinder sleeve glow discharge nitriding technique：
The workpiece i.e. cylinder sleeve that S01, selection need to be handled, is first dissolved and ageing treatment before glow discharge nitriding；
S02, treat glow discharge nitriding workpiece progress cleaning treatment；
The non-nitriding position of workpiece is shielded using special tooling 100 when S03, glow discharge nitriding；
S04, assemble workpiece and special tooling 100, is placed into ion nitriding furnace vacuum tank, is in vacuum tank
Cathode, the chamber wall of vacuum tank is anode, closes the burner hearth of ion nitriding furnace and starts vacuum pump progress vacuum；
S05, be filled with when vacuum is evacuated to numerical value set in advance needed for pressure nitrogen hydrogen mixeding gas；
S06, add high voltage pulse DC power supply in 500V~900V, two interpolars between the cathode and anode of vacuum tank
Low density gas is ionized and produces glow discharge, and the anode surface of cation towards the vacuum tank of hydrogen and nitrogen accelerates, and bombards workpiece
Surface, it is nitrogen-atoms that Nitrogen ion captures electron reduction from the cathode of vacuum tank, the iron that nitrogen-atoms is pounded with workpiece surface
Atom combines, and forms FeN and deposition forms nitriding layer on the surface of the workpiece.
In the present embodiment two, it is preferable that step S01 solid solution when by heater by temperature be heated to 1030 DEG C~
1050 DEG C, soaking time carries out cooling by oil cooling or water cooling and is dissolved between 1h~2h, can be effectively uniform
Material structure, is conducive to subsequent ion Nitrizing Treatment.And ageing treatment is being carried out, temperature is heated to 560 DEG C by heater
~520 DEG C, and soaking time so can effectively eliminate inside workpiece residual stress between 4h~8h, be conducive to workpiece
Size distortion control before and after glow discharge nitriding.
In the present embodiment three, it is preferable that when step S02 treats glow discharge nitriding workpiece progress cleaning treatment, mainly adopt
Cleaned with ultrasonic wave, and by the FREQUENCY CONTROL of ultrasonic wave in 28KHZ~40KHZ, while make it in aqua removes oil solution
Cleaned, it is possible to increase elimination efficiency, effectively removes workpiece surface oil stain and impurity, avoid in nitriding process due to greasy dirt
And arc is beaten so as to cause pit defect to workpiece surface.
In the present embodiment four, it is preferable that after assembling workpiece and special tooling 100 in step S04, place it in combustion
Burn in stove, burner hearth is closed and starts vacuum pump progress vacuum i.e. to carrying out application of vacuum in combustion furnace, specifically by burner hearth
Temperature control is at 420 DEG C~490 DEG C, and nitriding time is in 4h~8h, nitriding pressure 240Pa~280Pa.
It should be noted that vacuum need to pre-set a numerical value, so when vacuum pump is evacuated, reach the setting
During numerical value, stop working on, improve work efficiency.And preferably vacuum in step S05 is evacuated in the application and is preset
Numerical value be arranged on less than in 10Pa, realize the internal state close to perfect vacuum, can ensure Nitrizing Treatment effect.
In aforementioned four embodiment, referring to shown in Fig. 3, specific temperature is the heat by being connected with special tooling 100
300 temp measuring system of galvanic couple is controlled nitriding temperature, while passes through insulator in thermocouple 300 and 100 junction of special tooling
Pipe 400 is protected.Wherein, specific measurement method is divided into contact, sees Fig. 3, or contactless.At the same time using non-contact
Infrared temperature measurement system monitoring workpiece surface temperature.Certainly in the particular embodiment, can be selected according to actual conditions specific
Survey tool measure.
When being handled using aforementioned four embodiment, the cation of hydrogen and nitrogen accelerates strongly towards anode surface, bombards work
Part surface, produces sputtering, heating and suction-operated, while it be nitrogen-atoms that Nitrogen ion captures electron reduction from cathode, nitrogen-atoms and
The iron atom that workpiece surface is pounded combines, and forms FeN depositions on the surface of the workpiece, with the extension of time, nitrogen-atoms is certainly
Workpiece surface is inwardly spread, and forms one layer of nitriding layer so as to complete glow discharge nitriding process.Can be with by above-mentioned glow discharge nitriding technique
So that nitriding layer case hardness is in HV1000~HV1200, depth of penetration 0.02mm~0.10mm.It is effectively improved workpiece
The advantages that hardness, wearability, corrosion stability and high thermal fatigue resistance intensity.
Present invention also offers a kind of non-nitriding position shielding special tooling, referring to shown in Fig. 1-3, the special tooling is main
It is to be used to, to engine cylinder sleeve glow discharge nitriding technique, shield the non-nitriding position of workpiece when carrying out glow discharge nitriding,
So that nitriding region is contacted with nitriding source of the gas, Nitrizing Treatment is carried out.Non- nitriding position and small structure can so be protected
Shield, can also avoid workpiece endoporus before and after glow discharge nitriding that serious change occurs.
In the embodiment one of the present invention non-nitriding position shielding special tooling, referring again to shown in Fig. 1-3, a kind of non-nitriding
Position shields special tooling 100, including sleeve, and sleeve includes the outer sleeve 101 being set on the outside of workpiece and is arranged on work
Inner sleeve 102 on the inside of part.Wherein, outer sleeve 101 includes upper bush 1011 and lower sleeve 1012, specifically by upper set during assembling
The inner wall of cylinder 1011 and lower sleeve 1012 is contacted with workpiece outer wall；And between having between the outer wall and workpiece inner wall of inner sleeve 102
Gap d, so that the non-nitriding position of workpiece is shielded by outer sleeve 101 and inner sleeve 102 after the completion of assembling.
Specifically it should be noted that gap d will be left between the outer wall of inner sleeve 102 and workpiece inner wall, can effectively improve
Occur to beat arc phenomenon during Nitrizing Treatment.And in the application, preferably by the distance controlling of gap d between 0.4mm~0.6mm,
Certainly reasonable adjustment can be done to the size of gap d according to being actually needed in other embodiments.
In the embodiment two of the non-nitriding position shielding special tooling 100 of the present invention, a use is further also provided with
In support workpiece and the base 103 of special tooling 100, workpiece and special tooling can not only be ensured by the base 103 of setting
The stability of total after 100 assemblings, moreover it is possible to make nitriding source of the gas in nitriding process (i.e. nitrogen, hydrogen) by cylinder sleeve inside workpiece
It is more smooth, while avoid producing sharp angle effect in nitriding process.
Wherein, it should be noted that to meet that nitriding source of the gas is more smooth by cylinder sleeve inside workpiece in nitriding process, mainly
By base 103 and workpiece and special tooling 100 into streamlined setting.Specifically one end of base 103 is embedded in workpiece, i.e.,
The outer wall of base 103 and the inner wall of workpiece coordinate, and the other end outer wall of base 103 is flushed with the outer wall of outer sleeve 101, so that real
Now to the support of workpiece and special tooling 100.Certainly the other end outer wall of base 103 can exceed overcoat in other embodiments
The outer wall of cylinder 101, specifically does rational setting according to actual needs, is not construed as limiting in the application.
It should be noted that above-described embodiment can be freely combined as needed.The above is only the preferred of the present invention
Embodiment, it is noted that for those skilled in the art, do not departing from the premise of the principle of the invention
Under, some improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
- A kind of 1. engine cylinder sleeve glow discharge nitriding technique, it is characterised in that including：S01, workpiece are dissolved before glow discharge nitriding and ageing treatment；S02, carry out cleaning treatment to the workpiece；The non-nitriding position of the workpiece is shielded using special tooling when S03, glow discharge nitriding；S04, assemble the workpiece and the special tooling, is placed into ion nitriding furnace vacuum tank, and the vacuum is held Device the interior of the body belonging to YIN pole, the chamber wall of the vacuum tank is anode；Close the burner hearth of ion nitriding furnace and start vacuum pump and carry out very It is empty；S05, be filled with when vacuum is evacuated to numerical value set in advance needed for pressure nitrogen hydrogen mixeding gas；S06, add high voltage pulse DC power supply between the cathode and anode of the vacuum tank, and two interpolar low density gases are electric From and produce glow discharge, the anode surface of cation towards the vacuum tank of hydrogen and nitrogen accelerates, and bombards the workpiece surface, It is nitrogen-atoms that the cathode of Nitrogen ion from the vacuum tank, which captures electron reduction, and the nitrogen-atoms is bombarded with the workpiece surface The iron atom gone out combines, and forms FeN and deposition forms nitriding layer on the surface of the workpiece.
- 2. engine according to claim 1 cylinder sleeve glow discharge nitriding technique, it is characterised in that：The solid solubility temperature described in step S01 be 1030 DEG C~1050 DEG C, soaking time 1h~2h, and by oil cooling or water cooling into Row cooling；And/or；The temperature of timeliness described in step S01 is 560 DEG C~520 DEG C, soaking time 4h~8h.
- 3. engine according to claim 1 cylinder sleeve glow discharge nitriding technique, it is characterised in that：Cleaning way uses ultrasonic wave in step S02, and the frequency of the ultrasonic wave is 28KHZ~40KHZ, and cleaning solution is water Agent removes oil solution.
- 4. engine according to claim 1 cylinder sleeve glow discharge nitriding technique, it is characterised in that：The workpiece described in step S04 carries out vacuum with after special tooling assembling, closing burner hearth and starting vacuum pump, specifically The burner hearth in temperature control at 420 DEG C~490 DEG C, nitriding time 4h~8h, nitriding pressure 240Pa~280Pa.
- 5. engine according to claim 1 cylinder sleeve glow discharge nitriding technique, it is characterised in that：It is less than 10Pa that vacuum, which is evacuated to numerical value set in advance, in step S05.
- 6. according to claim 1-5 any one of them engine cylinder sleeve glow discharge nitriding technique, it is characterised in that：The nitriding layer case hardness is HV1000~HV1200, and depth of penetration is 0.02mm~0.10mm.
- 7. according to claim 1-5 any one of them engine cylinder sleeve glow discharge nitriding technique, it is characterised in that：Using thermocouple temperature measurement system control nitriding temperature in glow discharge nitriding technical process, institute is monitored using infrared temperature measurement system State workpiece surface temperature.
- A kind of 8. non-nitriding position shielding special tooling, it is characterised in that including：Sleeve, the sleeve include the outer sleeve being set on the outside of workpiece and the inner sleeve being arranged on the inside of workpiece；The outer sleeve includes upper bush and lower sleeve, and the inner wall of the upper bush and the lower sleeve connects with the workpiece outer wall Touch；The non-nitriding position of the workpiece is shielded by the outer sleeve and the inner sleeve.
- 9. non-nitriding position shielding special tooling according to claim 8, it is characterised in that：There is gap, the gap size is 0.4mm~0.6mm between the outer wall of the inner sleeve and the workpiece inner wall.
- 10. special tooling is shielded according to the non-nitriding position of claim 8-9 any one of them, it is characterised in that：A base for being used to support the workpiece and the special tooling is further included, one end of the base is embedded in the workpiece Interior, other end outer wall is flushed with the outer wall of the outer sleeve.
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| CN201610881337.7A CN107916391A (en) | 2016-10-09 | 2016-10-09 | Engine shields special tooling with cylinder sleeve glow discharge nitriding technique and non-nitriding position |
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| CN201610881337.7A CN107916391A (en) | 2016-10-09 | 2016-10-09 | Engine shields special tooling with cylinder sleeve glow discharge nitriding technique and non-nitriding position |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109207908A (en) * | 2018-10-24 | 2019-01-15 | 天津华盛昌齿轮有限公司 | A kind of high-speed steel hobboing cutter ion nitriding method and tooling |
| CN114107883A (en) * | 2021-11-29 | 2022-03-01 | 上海航天设备制造总厂有限公司 | Local ion nitriding method for inner cavity of precipitation hardening stainless steel annular part |
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| CN114107883B (en) * | 2021-11-29 | 2024-01-12 | 上海航天设备制造总厂有限公司 | Local ion nitriding method for inner cavity of precipitation hardening stainless steel annular part |
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