CN106756769A - A kind of antifatigue nitriding method of engine of heavy-duty car timing gears - Google Patents
A kind of antifatigue nitriding method of engine of heavy-duty car timing gears Download PDFInfo
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- CN106756769A CN106756769A CN201611129795.1A CN201611129795A CN106756769A CN 106756769 A CN106756769 A CN 106756769A CN 201611129795 A CN201611129795 A CN 201611129795A CN 106756769 A CN106756769 A CN 106756769A
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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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Abstract
The invention discloses a kind of antifatigue nitriding method of engine of heavy-duty car timing gears.The method is only to carry out compound treatment to the full flank profil at gear compound graduation circle in gear nitridation process, and depth of nitration 0.5mm, antifatigue wearing layer of the compound layer not less than 0.007mm are formed at the full flank profil of gear；Process route is as follows：Treat nitridation → shove charge → play arc → intensification → insulation → cooling.The present invention solves the limitation of existing gear Nitriding Technology requirement.The overall flank of tooth fatigue resistance after engine gear nitrogen treatment is improve, engine long life-span requirements of one's work can be met.
Description
Technical field
The present invention relates to a kind of antifatigue nitriding method of engine of heavy-duty car timing gears, belong to gear heat treatment technology
Field.
Background technology
Existing engine of heavy-duty car gear is mostly to carry out carburizing and quenching treatment using low-carbon alloy steel, to improve gear
Intensity and gear surface hardness, to improve the wearability and service life of gear, the method heat treatment high cost, machine after heat treatment
Tool high processing costs.Existing most of main engine factories require to improve tooth surface hardness and resistance to by using nitrogen treatment mode
Mill property, to improve gear surface contact fatigue strength, so that the service life of gear is improved, it is public to reach running car 1,200,000
In stroke backgear without heavy wear.The requirement of current gear nitridation is difficult to meet gear life demand.
The content of the invention
It is an object of the present invention to provide a kind of antifatigue nitriding method of engine of heavy-duty car timing gears.Improve hair
Overall flank of tooth fatigue resistance after motivation gear nitrogen treatment, to meet engine long life-span requirements of one's work, solves existing
The deficiency of technology.
Technical scheme：
A kind of antifatigue nitriding method of engine of heavy-duty car timing gears, the method is only to gear in gear nitridation process
Full flank profil at reference circle carries out compound treatment, nitriding layer of the formation depth more than 0.5mm at the full flank profil of gear, and
Nitriding layer surface forms compound layer of the depth more than 0.007mm；Handling process is as follows：Treat nitridation → shove charge → play arc → intensification
→ insulation → cooling.
In preceding method, the full flank profil includes tooth top, the flank of tooth, tooth root.
In preceding method, the tooth surface roughness of the procedure calls gear to be nitrogenized to be nitrogenized is not less than Ra0.6, in advance
Standby heat treatment is high tempering sorbite, and hardness range is 225~285HB, wheel tooth position non-oxidation stain or other foreign matters.
In preceding method, in the shove charge operation, gear to be nitrogenized is placed for stacking and constitutes gear string, the tooth in gear string
Separate through frock between wheel and gear, frock is the cylinder with centre bore, is between the cylinder of cylinder and two planes of gear
90 ° of angles are vertical；Gear string is put by equilateral triangle, and the spacing between gear string and gear string is 20~25mm；Every string gear
Alignd between adjacent teeth and the gear teeth.
In preceding method, it is described beat arc operation and beat arc parameter be divided into three sections, first paragraph voltage is 720~740V, dutycycle
It is 30~40%, beats arc and be warming up to 50~60 DEG C of end；Second segment voltage is 700~710V, and dutycycle is 50~60%, beats arc liter
Warm to 70~80 DEG C end；3rd section of voltage is 650~670V, and dutycycle is 70~90%, beats arc and is warming up to 90~100 DEG C of knots
Beam；70~80Pa of arc voltage power is beaten in the starting for beating arc process.
In preceding method, in the heating process, intensification parameter is divided into four sections：First paragraph is with slope 3~3.5 DEG C/min liters
Temperature keeps 10~15min to 200~220 DEG C；Second segment is warming up to 300~310 DEG C with 2~2.5 DEG C/min of slope, keeps 10
~15min；3rd section is warming up to 450~470 DEG C with 1.5~2.0 DEG C/min of slope, keeps 40~50min；4th section with slope
1.0~1.2 DEG C/min is warming up to 520~540 DEG C, into nitridation holding stage.In the insulation operation, comprising two sections of insulations：
First paragraph holding temperature is 520~540 DEG C, 900~950min of soaking time；Second segment is cooled to 1.0~1.2 DEG C/min
505~520 DEG C, 300~330min of soaking time.In the gentle insulating process of liter, furnace pressure is divided into five sections according to temperature
Keep the constant of pressure：First paragraph be temperature at 100~209 DEG C, pressure keep 80~100Pa；Second segment is temperature 210
At~319 DEG C, pressure keeps 120~140Pa；3rd section be temperature at 320~429 DEG C, pressure keep 160~180Pa；The
Four sections be temperature at 430~500 DEG C, pressure keep 200~220Pa；5th section be temperature at 500~540 DEG C, pressure protect
Hold 260~280Pa；The whole process pressure rate of rise is 5~6Pa/min.Entirely rise in gentle insulating process, need to lead to in stove
Enter ammonia, the inlet of ammonia is controlled by flowmeter, and pressure is controlled by voltage-stablizer.
In preceding method, in the insulation operation, ammonia flow is 2.0~3.5L/min.
In foregoing refrigerating work procedure, be cooling means for close in high-voltage pulse power source, holding furnace less than 260~280Pa with
Stove is cooled to less than 150 DEG C.
Compared with prior art, the present invention is that a kind of full flank profil compound layer is not less than 0.007mm, and diffusion layer is more than
The ion Plasma Nitriding Treatment method of 0.5mm, using this kind of Nitriding Technology, it has following characteristics：
1st, pending part surface roughness is not less than Ra0.6；
2nd, position of the part on body of heater is put, into equilateral triangle；
3rd, arc starting voltage is beaten higher than 30~40V of general ionic nitriding voltage (generally 680~700V)；
4th, two sections of temperature spans are not less than 100 DEG C before warming-up section, and the 3rd section is not higher than 80 DEG C with the 4th section of temperature span, and
The warm time is not less than 30min；
5th, in insulating process, ammonia enters flow 2.0L~3.5L/min；
6th, nitriding insulating process is two sections, and first paragraph temperature is higher than 15~25 DEG C of second segment temperature；
7th, the cooling procedure of nitriding part cools to less than 150 DEG C with the furnace under less than 260~280Pa of furnace pressure.
Brief description of the drawings
Fig. 1 is gear nitration case schematic diagram；
Fig. 2 is gear shove charge sketch；
Fig. 3 is gear shove charge schematic perspective view；
Fig. 4 is that the gear teeth dissect sectional view；
Fig. 5 is the schematic diagram of 500 times of A points amplification in Fig. 3；
Fig. 6 is Temperature-time process curve figure；
Fig. 7 is temperature and pressure process curve figure.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples, but not as to of the invention any
Limitation.
A kind of antifatigue nitriding method of engine of heavy-duty car timing gears, the method is only right in gear nitridation process
Full flank profil at gear compound graduation circle carries out compound treatment, and nitriding layer of the depth more than 0.5mm is formed at the full flank profil of gear,
And form compound layer of the depth more than 0.007mm in nitriding layer surface；Handling process is as follows：Treat nitridation → shove charge → beat arc →
Heat up → insulation → cooling.The full flank profil includes tooth top, the flank of tooth, tooth root.
In foregoing operation to be nitrogenized, it is desirable to which the tooth surface roughness of gear to be nitrogenized is not less than Ra0.6, conditioning treatment
It is high tempering sorbite, hardness range is 225~285HB, wheel tooth position non-oxidation stain or other foreign matters.Foregoing shove charge work
In sequence, gear to be nitrogenized is placed for stacking and constitutes gear string, is separated through frock between the gear and gear in gear string, and frock is
Cylinder with centre bore is vertical in 90 ° of angles between the cylinder of cylinder and two planes of gear；Gear string is put by equilateral triangle
Put, the spacing between gear string and gear string is 20~25mm；Often alignd between the adjacent teeth and the gear teeth of string gear.It is foregoing to beat
In arc operation, beat arc parameter and be divided into three sections, first paragraph voltage is 720~740V, and dutycycle is 30~40%, beats arc and is warming up to 50
~60 DEG C of end；Second segment voltage is 700~710V, and dutycycle is 50~60%, beats arc and is warming up to 70~80 DEG C of end；3rd
Section voltage is 650~670V, and dutycycle is 70~90%, beats arc and is warming up to 90~100 DEG C of end；Arc is beaten in the starting for beating arc process
70~80Pa of pressure.In preceding method, in the heating process, intensification parameter is divided into four sections：First paragraph with 3~3.5 DEG C of slope/
Min is warming up to 200~220 DEG C, keeps 10~15min；Second segment is warming up to 300~310 DEG C with 2~2.5 DEG C/min of slope, protects
Hold 10~15min；3rd section is warming up to 450~470 DEG C with 1.5~2.0 DEG C/min of slope, keeps 40~50min；4th section with
1.0~1.2 DEG C/min of slope is warming up to 520~540 DEG C, into nitridation holding stage.In the insulation operation, comprising two sections of guarantors
Temperature：First paragraph holding temperature is 520~540 DEG C, 900~950min of soaking time；Second segment is lowered the temperature with 1.0~1.2 DEG C/min
To 505~520 DEG C, 300~330min of soaking time.In the gentle insulating process of liter, furnace pressure is divided into five according to temperature
Section keeps the constant of pressure：First paragraph be temperature at 100~209 DEG C, pressure keep 80~100Pa；Second segment is that temperature exists
At 210~319 DEG C, pressure keeps 120~140Pa；3rd section be temperature at 320~429 DEG C, pressure keep 160~
180Pa；4th section be temperature at 430~500 DEG C, pressure keep 200~220Pa；5th section is temperature at 500~540 DEG C
When, pressure keeps 260~280Pa；The whole process pressure rate of rise is 5~6Pa/min.In entirely rising gentle insulating process,
Need to be to ammonia be passed through in stove, the inlet of ammonia is controlled by flowmeter, and pressure is controlled by voltage-stablizer.Insulating process
In, ammonia flow is 2.0~3.5L/min.In foregoing refrigerating work procedure, refrigerating work procedure is closing high-voltage pulse power source, in holding furnace
Less than 150 DEG C are cooled to the furnace less than 260~280Pa.
Embodiment
Certain model heavy truck engine crankshaft gear, is 42CrMo using material, carries out ion Plasma Nitriding Treatment, and technical requirements expand
Dissipate layer depth and be more than 0.007mm more than 0.5mm, compound layer, hardness is more than 600HV0.1.Obtained using ion Plasma Nitriding Treatment
Nitriding result, nitridation process is divided into following steps：Part → shove charge to be nitrogenized → play arc → intensification → insulation → cooling
The content that the examination of foregoing part to be nitrogenized is related to is that Part Surface Roughness is not less than Ra0.6, and conditioning treatment is high temperature
Tempered sorbite, hardness range is 225~285HB, non-oxidation stain in position to be nitrogenized or other foreign matters.Part is used before shove charge
120# gasoline cleans up piece surface.
The shove charge is put on furnace hearth plate for part according to the position of positive triangle, frock and part put such as Fig. 2 and
Shown in Fig. 3.
The technological parameter such as table 1 below of arc process is beaten, starting the arc pressure is 80Pa.
1 dozen of arc process parameter of table
| Hop count | Voltage/V | Dutycycle | Temperature/DEG C |
| 1 | 740 | 40 | 50 |
| 2 | 710 | 60 | 80 |
| 3 | 680 | 80 | 100 |
The intensification, the technological parameter such as table 2 below, table 3 of insulating process.
The relevant parameter of temperature and time in the temperature-rise period of table 2
| Hop count | Voltage（V） | Intensification slope DEG C/min） | Temperature（℃） | Time（min） |
| 1 | 650 | 3 | 200 | 15 |
| 2 | 660 | 2 | 310 | 15 |
| 3 | 670 | 2 | 470 | 50 |
| 4 | 680 | 1.2 | 530 | - |
The relevant parameter of temperature and pressure in the process of table 3
| Hop count | Temperature（℃） | Pressure slope Pa/min） | Pressure（Pa） |
| 1 | 100~209 | 5 | 80 |
| 2 | 210~319 | 5 | 130 |
| 3 | 320~429 | 5 | 170 |
| 4 | 430~500 | 5 | 210 |
| 5 | 501~530 | 5 | 270 |
The relevant parameter of temperature and time in the insulation of table 4
| Hop count | Holding temperature（℃） | Soaking time（min） | Ammonia flow (L/min) |
| 1 | 530 | 930 | 2.0~3.5 |
| 2 | 510 | 320 | 2.0~3.5 |
Cooling procedure is less than cooling to less than 150 DEG C with the furnace under 260Pa pressure in stove.
In nitridation process, temperature control process uses thermocouple measuring temperature, and time, furnace temperature are recorded using recording instrument
Uniformity requirement is ± 5 DEG C.Pressure control procedure is controlled using voltage-stablizer, control accuracy requirement ± 10Pa, ammonia flow
It is controlled using flowmeter, control accuracy requirement ± 0.5L/min, heating rate control process is using automatically controlling, and control is smart
Degree requires ± 0.5 DEG C/min.
The invention nitrogenizes result verification, and wheel tooth depth nitrided case depth is 0.652mm, and gear dissects sectional view such as Fig. 4 institutes
Show, Fig. 5 is A point partial enlarged drawings, and its compound layer is detected by being amplified to gear section, and compound layer is all higher than
0.007mm, the result meets product technology requirement.
Fig. 6 is Temperature-time process curve, and Fig. 7 is temperature and pressure process curve schematic diagram.
Claims (8)
1. a kind of antifatigue nitriding method of engine of heavy-duty car timing gears, it is characterised in that：The method is in gear nitridation
During compound treatment only is carried out to the full flank profil at gear compound graduation circle, at the full flank profil of gear formed depth be more than
The nitriding layer of 0.5mm, and form compound layer of the depth more than 0.007mm in nitriding layer surface；Handling process is as follows：Wait to nitrogenize
→ shove charge → play arc → intensification → insulation → cooling.
2. method according to claim 1, it is characterised in that：The full flank profil includes tooth top, the flank of tooth, tooth root.
3. method according to claim 1, it is characterised in that：In the operation to be nitrogenized, it is desirable to the gear teeth of gear to be nitrogenized
Surface roughness is not less than Ra0.6, and conditioning treatment is high tempering sorbite, and hardness range is 225~285HB, takes turns teeth portion
Position non-oxidation stain or other foreign matters.
4. method according to claim 1, it is characterised in that：In the shove charge operation, gear to be nitrogenized places structure for stacking
Into gear string, separate through frock between the gear and gear in gear string, frock is the cylinder with centre bore, the cylinder of cylinder
It is vertical in 90 ° of angles and two planes of gear between；Gear string is put by equilateral triangle, and the spacing between gear string and gear string is
20~25mm；Often alignd between the adjacent teeth and the gear teeth of string gear.
5. method according to claim 1, it is characterised in that：It is described to beat in arc operation, beat arc parameter and be divided into three sections, first paragraph
Voltage is 720~740V, and dutycycle is 30~40%, beats arc and is warming up to 50~60 DEG C of end；Second segment voltage is 700~710V,
Dutycycle is 50~60%, beats arc and is warming up to 70~80 DEG C of end；3rd section of voltage is 650~670V, and dutycycle is 70~90%,
Beat arc and be warming up to 90~100 DEG C of end；70~80Pa of arc voltage power is beaten in the starting for beating arc process.
6. method according to claim 1, it is characterised in that：In the heating process, intensification parameter is divided into four sections：First paragraph
200~220 DEG C are warming up to 3~3.5 DEG C/min of slope, 10~15min is kept；Second segment is heated up with 2~2.5 DEG C/min of slope
To 300~310 DEG C, 10~15min is kept；3rd section is warming up to 450~470 DEG C with 1.5~2.0 DEG C/min of slope, keeps 40
~50min；4th section is warming up to 520~540 DEG C with 1.0~1.2 DEG C/min of slope, into nitridation holding stage；The insulation
In operation, comprising two sections of insulations：First paragraph holding temperature is 520~540 DEG C, 900~950min of soaking time；Second segment with
1.0~1.2 DEG C/min is cooled to 505~520 DEG C, 300~330min of soaking time；In temperature-rise period, furnace pressure according to
Temperature is divided into five sections and keeps the constant of pressure：First paragraph be temperature at 100~209 DEG C, pressure keep 80~100Pa；Second
Section be temperature at 210~319 DEG C, pressure keep 120~140Pa；3rd section be temperature at 320~429 DEG C, pressure keep
160~180Pa；4th section be temperature at 430~500 DEG C, pressure keep 200~220Pa；5th section be temperature 500~
At 540 DEG C, pressure keeps 260~280Pa,
The whole process pressure rate of rise is 5~6Pa/min；In entirely rising gentle insulating process, need to be to being passed through ammonia, ammonia in stove
The inlet of gas is controlled by flowmeter, and pressure is controlled by voltage-stablizer.
7. method according to claim 1, it is characterised in that：In the insulation operation, ammonia flow is 2.0~3.5L/
min。
8. method according to claim 1, it is characterised in that：The refrigerating work procedure is closing high-voltage pulse power source, holding furnace
Interior pressure cools to less than 150 DEG C with the furnace less than 260~280Pa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611129795.1A CN106756769A (en) | 2016-12-09 | 2016-12-09 | A kind of antifatigue nitriding method of engine of heavy-duty car timing gears |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611129795.1A CN106756769A (en) | 2016-12-09 | 2016-12-09 | A kind of antifatigue nitriding method of engine of heavy-duty car timing gears |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108893708A (en) * | 2018-07-12 | 2018-11-27 | 贵州大学 | A kind of promotion 904L stainless steel hardness does not reduce corrosion proof nitriding method |
| CN112276500A (en) * | 2020-10-20 | 2021-01-29 | 贵州群建精密机械有限公司 | Method for processing small-modulus sector worm gear |
| CN115505866A (en) * | 2022-11-02 | 2022-12-23 | 贵州群建精密机械有限公司 | Method for controlling uniformity of ion nitriding diffusion layer of thin-wall special-shaped gear |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108893708A (en) * | 2018-07-12 | 2018-11-27 | 贵州大学 | A kind of promotion 904L stainless steel hardness does not reduce corrosion proof nitriding method |
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| CN112276500A (en) * | 2020-10-20 | 2021-01-29 | 贵州群建精密机械有限公司 | Method for processing small-modulus sector worm gear |
| CN115505866A (en) * | 2022-11-02 | 2022-12-23 | 贵州群建精密机械有限公司 | Method for controlling uniformity of ion nitriding diffusion layer of thin-wall special-shaped gear |
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