CN106702311A - Cam shallow layer carbonitriding heat treatment method - Google Patents
Cam shallow layer carbonitriding heat treatment method Download PDFInfo
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- CN106702311A CN106702311A CN201611074694.9A CN201611074694A CN106702311A CN 106702311 A CN106702311 A CN 106702311A CN 201611074694 A CN201611074694 A CN 201611074694A CN 106702311 A CN106702311 A CN 106702311A
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- carbo
- cam
- nitriding
- heat treatment
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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
- C23C8/28—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 more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention relates to a cam shallow layer carbonitriding heat treatment method. The method comprises the steps of carbonitriding, quenching, cleaning and tempering; a carbonitriding main furnace for carbonitriding is provided with four areas in sequence in the heat treatment direction; the furnace temperature of the first area is set as 910+-10 DEG C; the furnace temperatures of the second and third areas are set as 860+-10 DEG C; the temperature furnace of the fourth area is the same with the quenching temperature, and is set as 810+-10 DEG C; during carbonitriding, the carbon potential is controlled as 1.05-1.15 CP, the ammonia quantity is 250-280 L/h, and the carbon potential is controlled by combining manual adjustment with automatic control; the net band frequency of the carbonitriding main furnace is set as 31-33 HZ; and the time of a cam from entering of the carbonitriding main furnace to quenching is 65-75 min. The method can guarantee an effective hardening layer of the cam in a section of 0.15-0.25 mm; the heart hardness is not beyond 400 HV; the flatness deformation is not beyond 0.1 mm; and the method is suitable for large-scale production.
Description
Technical field
The invention belongs to carbo-nitriding Field of Heat-treatment, and in particular to a kind of cam shallow-layer carbo-nitriding heat treatment method.
Background technology
As depicted in figs. 1 and 2, cam is the part in electric switch, and material is S20C, and material thickness is 2mm or so, effectively hard
Change layer and require 0.15-0.25mm, centre hardness is no more than 400HV5, case hardness 650-750HV5.Cam dimension requirement is tight,
Therefore using the method builder cam of fine.After cam fine-punching formation, need to be heat-treated through carbo-nitriding, reach case hardness, have
The requirement of effect hardened layer and centre hardness.
The Surface heat-treatent of conventional cam is to use batch-type furnace, and batch-type furnace belongs to periodic stove, and low production efficiency needs design
Fixture of the specific heat resisting steel hanger as cam is manufactured, frock input is high.And according to the feature of cam parts, need to be using insertion
Formula wears the mode shove charge that axle is mounted, and charging efficiency is low, and part is affected by gravity in heating process and is susceptible to ovalizing deflection,
Hole dimensional accuracy is difficult to ensure card.
Had using the carbo-nitriding heat treatment of meshbeltfurnace at present：The patent of Application No. 201110168024.4 discloses one
Thin-layer carbonitriding heat treatment method of locating disc is planted, is heat-treated using meshbeltfurnace, step is respectively preparation equipment and screw, setting
Guipure furnace parameters, shove charge, quenching, cleaning, tempering.The method is only suitable for the meshbeltfurnace heat treatment of positioning disk, it is impossible to control center portion
Hardness.The patent of Application No. 201110059670.7 discloses mid-deep strata carburizing or the carbon of a kind of bearing or zero clutch part
Nitrogen permeation heat treatment method, is continuously produced using the roller mesh-belt furnace of controlled atmosphere, step be followed successively by ooze by force, spread, quenching,
Clean, be tempered and come out of the stove air cooling.The method process time is long, and the interval fluctuation of carbon potential is big, is adapted to mid-deep strata carburizing or carbonitriding
Treatment.The patent of Application No. 201080040230.0 discloses a kind of manufacture method of carbo-nitriding component, using 900-950
The carburizing of DEG C carburizing atmosphere, then 800-900 DEG C, the carbo-nitriding of 0.2%-0.6% nitrogen gesture, quenching and peening treatment.
The method is not suitable for the heat treatment of meshbeltfurnace, it is impossible to the centre hardness of control member.
And this cam planes degree is no more than 0.1mm, therefore heat treatment process must strictly control size distortion.Cam face
Hardness all can not be too high no more than the carbon potential and ammonia flow during 750HV, therefore carbo-nitriding；Secondly, the cam material is thick
Relatively thin, center portion is easily hardened, and causes part fragility big；In addition, effective hardness layer interval is narrow, it is 0.1mm (general parts
Effective hardness layer control interval is 0.2mm).Therefore, hole size, flatness, case hardness, centre hardness and effective hardness layer
Control be cam Technology for Heating Processing need solve Major Difficulties.
The content of the invention
It is an object of the invention to provide a kind of cam shallow-layer carbo-nitriding heat treatment method, the method ensure that cam has
Effect hardened layer is interval interior in 0.15-0.25mm, and centre hardness is no more than 400HV, and flatness deformation is no more than 0.1mm, is adapted to criticize
Amount production.
The technical solution adopted in the present invention is：
A kind of cam shallow-layer carbo-nitriding heat treatment method, including the main stove of carbo-nitriding, quenching respectively in meshbeltfurnace
Carbo-nitriding, quenching, cleaning and the tempering step carried out successively in oil groove, cleaning machine and tempering furnace；The main stove of carbo-nitriding is along warm
Treatment direction is sequentially provided with 4th area, and first area's furnace temperature is set as 910 ± 10 DEG C, and second and third area's furnace temperature is set as 860 ± 10 DEG C,
4th area's furnace temperature is identical with hardening heat, be set as 810 ± 10 DEG C；Carbon-potential control is 1.05-1.15CP, ammonia during carbo-nitriding
It is 250-280L/h to measure, and the control of carbon potential is used to adjust and automatically control manually and is combined；The guipure frequency of the main stove of carbo-nitriding
It is set as 31-33HZ, cam is 65-75min from the entrance main stove of carbo-nitriding to the time for being quenched.
Further, cleansing medium during cleaning be aqueous sodium carbonate, cleaning temperature be 60-80 DEG C.
Further, temperature during tempering be 200 ± 10 DEG C, tempering time be 90-120min.
Further, stress relief annealing and first time vibration finishing step were increased successively before carbo-nitriding, in tempering
Increase by second vibration finishing step afterwards.
Further, holding temperature during stress relief annealing be 450 ± 30 DEG C, soaking time be 2 ± 0.5 hours, insulation
Air cooling afterwards.
Further, first time vibration finishing and second vibration finishing are that cam is put into light polishing machine, and are added
Electric corundum and industrial soda are vibrated 30 ± 20 minutes, with clear water that spot and alkaline flushing is clean after vibration.
The beneficial effects of the invention are as follows：
First area's furnace temperature is set as 910 ± 10 DEG C, higher than 880 DEG C of conventional carbo-nitriding temperature upper limit, it is therefore an objective to the region
Cam is based on carburizing, it is to avoid the oxygen content skin decarburization skin effect phenomenon for causing too high in stove；Second and third area's furnace temperature is set as
860 ± 10 DEG C, be normal carbo-nitriding temperature, it is ensured that the intake of nitrogen content, improves cam face hardness；4th area's furnace temperature sets
It is fixed identical with hardening heat, it is ensured that cam quenches at such a temperature, Reducing distortion, cam centre hardness is reduced, hardening heat is
810 ± 10 DEG C, it is ensured that centre hardness is reduced to below HV400；Carbon-potential control is 1.05-1.15CP, and ammonia amount is 250-280L/
H, the control of carbon potential is used to adjust and automatically control manually and is combined, and is not exclusively relied on and is automatically controlled, and reduces carbon-potential control interval,
Ensure cam face hardness and effective hardness layer in acceptability limit；The guipure frequency setting of the main stove of carbo-nitriding is 31-33HZ,
Ensure that time of the cam into the main stove of carbo-nitriding to quenching is 65-75min, control effective hardness layer uniformity；The method
Shallow-layer carbo-nitriding heat treatment is carried out to cam using meshbeltfurnace, each region furnace temperature is controlled respectively, control carbon potential and ammonia amount, protected
In 0.15-0.25mm is interval, centre hardness is no more than 400HV to card cam effective hardness layer, and flatness deformation is no more than
0.1mm, is adapted to batch production.
Brief description of the drawings
Fig. 1 is the fine part schematic diagram of the cam for having convex bud in the embodiment of the present invention.
Fig. 2 is the fine part schematic diagram of the cam without convex bud in the embodiment of the present invention.
Fig. 3 is the flow chart of the embodiment of the present invention.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples.
As depicted in figs. 1 and 2, it is the fine part schematic diagrames of two kinds of conventional cams (having convex bud and without convex bud), material is
S20C, expects thickness 2mm, and effective hardness layer requirement 0.15-0.25mm, centre hardness requirement is no more than 400HV5, case hardness requirement
650-750HV5, planarity requirements are no more than 0.1mm.
As shown in figure 3, embodiment of the present invention cam shallow-layer carbo-nitriding heat treatment step is as follows.
S1. stress relief annealing；
Equipment is bench vehicle type electrical resistance furnace, and cam is fitted into metal Turnover Box, enters stove insulation (holding temperature is 450 ± 30 DEG C)
After two hours, air cooling of coming out of the stove.By residual stress of the cam after two processes of insulation and air cooling eliminate cam fine, after reduction
Continuous heat treatment deformation.
S2. first time vibration finishing；
8mm × 8mm electricity corundum and industrial soda are poured into light polishing machine and vibrated about 30 minutes, with clear water by spot and alkaline flushing
Totally, with except unwanted contaminants such as descale, rusty stain, greasy dirt and sulfurified lubricants.The alkali lye of piece surface is after vibration finishing
Must be rinsed well with clean clear water, the alkali for otherwise remaining is easily adhered carbon black, Er Qiehui in cam parts carbo-nitriding
Cause furnace lining and other heat-resisting alloy corrosion of elements.
S3. carbo-nitriding and quenching；
The areas of carbo-nitriding Zhu Lu tetra- control furnace temperature, first area's furnace temperature to be set as 910 ± 10 DEG C respectively, second and third area's furnace temperature
It is set as 860 ± 10 DEG C, the hardening heat of the 4th area's furnace temperature and cam is set as 810 ± 10 DEG C.The guipure of the main stove of carbo-nitriding
Frequency setting is 31-33HZ, it is ensured that time of the cam parts into the main stove of carbo-nitriding to quenching is 65-75min, carbon-potential control
It is 1.05-1.15CP, ammonia amount is 250-280L/h, and the control of carbon potential uses the side for adjusting and automatically controlling manually and be combined
Method, not exclusively relies on and automatically controls；
First area's furnace temperature is set as 910 ± 10 DEG C, higher than 880 DEG C of conventional carbo-nitriding temperature upper limit, it is therefore an objective to the region
Cam is based on carburizing, it is to avoid the oxygen content skin decarburization skin effect phenomenon for causing too high in stove；Second and third area's furnace temperature is set as
860 ± 10 DEG C, be normal carbo-nitriding temperature, it is ensured that the intake of nitrogen content, improves cam face hardness；4th area's furnace temperature sets
It is fixed identical with hardening heat, it is ensured that cam quenches at such a temperature, Reducing distortion, cam centre hardness is reduced, hardening heat is
810 ± 10 DEG C, it is ensured that centre hardness is reduced to below HV400；Carbon-potential control is 1.05-1.15CP, and ammonia amount is 250-280L/
H, the control of carbon potential is used to adjust and automatically control manually and is combined, and is not exclusively relied on and is automatically controlled, and reduces carbon-potential control interval,
Ensure cam face hardness and effective hardness layer in acceptability limit；The guipure frequency setting of the main stove of carbo-nitriding is 31-33HZ,
Ensure that time of the cam into the main stove of carbo-nitriding to quenching is 65-75min, control effective hardness layer uniformity；The method
Shallow-layer carbo-nitriding heat treatment is carried out to cam using meshbeltfurnace, each region furnace temperature is controlled respectively, control carbon potential and ammonia amount, protected
In 0.15-0.25mm is interval, centre hardness is no more than 400HV to card cam effective hardness layer, and flatness deformation is no more than
0.1mm, is adapted to batch production.
S4. clean；
Cam enters cleaning in cleaning machine with guipure transmission, and (cleansing medium is aqueous sodium carbonate, cleaning in the present embodiment
60-80 DEG C of temperature), wash the greasy dirt and debris of cam face off.
S5. it is tempered；
The cam for having cleaned enters tempering in tempering furnace with guipure transmission, and temperature is 200 ± 10 DEG C, and tempering time is
90-120min。
In S3 to S5, the main stove of carbo-nitriding, the quenching of carbo-nitriding, quenching, cleaning and tempering respectively in meshbeltfurnace
Carried out successively in oil groove, cleaning machine and tempering furnace.
S6. second vibration finishing；
Cam after tempering, 8mm × 8mm electricity corundum and industrial soda are poured into light polishing machine and vibrated about 30 minutes, clear water is used
Spot and alkaline flushing is clean, with except dirts such as descale, carbon black and greasy dirts；
Increase by second vibration finishing, the dirts such as descale, carbon black and greasy dirt can be removed, due to completing to shake for the first time
Must be rinsed well with clean clear water after dynamic light decorations, carbon black can be otherwise easily adhered in carbo-nitriding, and stove can be caused
Serve as a contrast and other heat-resisting alloy corrosion of elements, therefore second vibration finishing of increase can remove first time vibration finishing and not clean
The carbon black adhered in carbo-nitriding in the case of clean.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (6)
1. a kind of cam shallow-layer carbo-nitriding heat treatment method, including the main stove of carbo-nitriding, quenching oil respectively in meshbeltfurnace
Carbo-nitriding, quenching, cleaning and the tempering step carried out successively in groove, cleaning machine and tempering furnace, it is characterised in that：Carbo-nitriding
Main stove is sequentially provided with 4th area along heat treatment direction, and first area's furnace temperature is set as 910 ± 10 DEG C, and second and third area's furnace temperature is set as 860
± 10 DEG C, the 4th area's furnace temperature is identical with hardening heat, be set as 810 ± 10 DEG C；Carbon-potential control is 1.05- during carbo-nitriding
1.15CP, ammonia amount is 250-280L/h, and the control of carbon potential is used to adjust and automatically control manually and is combined；The main stove of carbo-nitriding
Guipure frequency setting be 31-33HZ, cam from enter the main stove of carbo-nitriding to the time for being quenched be 65-75min.
2. cam shallow-layer carbo-nitriding heat treatment method as claimed in claim 1, it is characterised in that：Cleansing medium during cleaning
For aqueous sodium carbonate, cleaning temperature are 60-80 DEG C.
3. cam shallow-layer carbo-nitriding heat treatment method as claimed in claim 1, it is characterised in that：Temperature during tempering
For 200 ± 10 DEG C, tempering time are 90-120min.
4. cam shallow-layer carbo-nitriding heat treatment method as claimed in claim 1, it is characterised in that：Before carbo-nitriding according to
It is secondary to increase stress relief annealing and first time vibration finishing step, second vibration finishing step is increased after tempering.
5. cam shallow-layer carbo-nitriding heat treatment method as claimed in claim 4, it is characterised in that：Guarantor during stress relief annealing
Temperature is 450 ± 30 DEG C, soaking time is 2 ± 0.5 hours, air cooling after insulation.
6. cam shallow-layer carbo-nitriding heat treatment method as claimed in claim 4, it is characterised in that：First time vibration finishing and
Second vibration finishing is that cam is put into light polishing machine, and adds electric corundum and industrial soda to vibrate 30 ± 20 minutes, vibration
It is with clear water that spot and alkaline flushing is clean afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611074694.9A CN106702311B (en) | 2016-11-29 | 2016-11-29 | Cam shallow-layer carbo-nitriding heat treatment method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611074694.9A CN106702311B (en) | 2016-11-29 | 2016-11-29 | Cam shallow-layer carbo-nitriding heat treatment method |
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| CN106702311A true CN106702311A (en) | 2017-05-24 |
| CN106702311B CN106702311B (en) | 2019-03-26 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108754408A (en) * | 2018-06-29 | 2018-11-06 | 济宁精益轴承有限公司 | A method of control bearing space ring case hardness |
| CN109971937A (en) * | 2018-12-27 | 2019-07-05 | 浙江辛子精工机械股份有限公司 | High-carbon chromium steel passenger vehicle engine cam bit integral quenching technique and its equipment |
| CN112501544A (en) * | 2020-08-27 | 2021-03-16 | 苏州新豪轴承股份有限公司 | Bearing part machining process |
| CN114059006A (en) * | 2021-11-03 | 2022-02-18 | 龙工（上海）精工液压有限公司 | Process for controlling tufftriding deformation of plunger pump cylinder body |
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|---|---|---|---|---|
| CN1498983A (en) * | 2002-11-04 | 2004-05-26 | 沪东重机股份有限公司 | Method of carburizing and quenching cam of diesel engine in low speed |
| CN102154652A (en) * | 2011-03-11 | 2011-08-17 | 江苏南方轴承股份有限公司 | Medium-deep-layer carburization or carbonitriding thermal processing technology for bearings or clutch parts |
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2016
- 2016-11-29 CN CN201611074694.9A patent/CN106702311B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1498983A (en) * | 2002-11-04 | 2004-05-26 | 沪东重机股份有限公司 | Method of carburizing and quenching cam of diesel engine in low speed |
| CN102154652A (en) * | 2011-03-11 | 2011-08-17 | 江苏南方轴承股份有限公司 | Medium-deep-layer carburization or carbonitriding thermal processing technology for bearings or clutch parts |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108754408A (en) * | 2018-06-29 | 2018-11-06 | 济宁精益轴承有限公司 | A method of control bearing space ring case hardness |
| CN109971937A (en) * | 2018-12-27 | 2019-07-05 | 浙江辛子精工机械股份有限公司 | High-carbon chromium steel passenger vehicle engine cam bit integral quenching technique and its equipment |
| CN109971937B (en) * | 2018-12-27 | 2024-01-23 | 浙江辛子精工机械有限公司 | Integral quenching process and equipment for high-carbon chromium steel passenger car engine cam plate |
| CN112501544A (en) * | 2020-08-27 | 2021-03-16 | 苏州新豪轴承股份有限公司 | Bearing part machining process |
| CN114059006A (en) * | 2021-11-03 | 2022-02-18 | 龙工（上海）精工液压有限公司 | Process for controlling tufftriding deformation of plunger pump cylinder body |
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| CN106702311B (en) | 2019-03-26 |
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Denomination of invention: Shallow carbonitriding heat treatment method of cam Effective date of registration: 20220629 Granted publication date: 20190326 Pledgee: Bank of China Limited Wuhan Qingshan sub branch Pledgor: WUHAN HUAXIA FINE-BLANKING TECHNOLOGY CO.,LTD. Registration number: Y2022420000207 |