CN108004499A - A kind of automobile crane carbon nitrogen heat treatment method - Google Patents
A kind of automobile crane carbon nitrogen heat treatment method Download PDFInfo
- Publication number
- CN108004499A CN108004499A CN201610964826.9A CN201610964826A CN108004499A CN 108004499 A CN108004499 A CN 108004499A CN 201610964826 A CN201610964826 A CN 201610964826A CN 108004499 A CN108004499 A CN 108004499A
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- China
- Prior art keywords
- bent axle
- heat
- quenching
- nitrogen
- treatment method
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Classifications
-
- 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
- C21D9/30—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for crankshafts; for camshafts
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses a kind of automobile crane carbon nitrogen heat treatment method.A kind of automobile crane carbon nitrogen heat treatment method, carries out in the steps below：A, bent axle is put into heat-treatment furnace and is warming up to 850 DEG C~875 DEG C, samming 20~25 minutes, makes carbon potential in heat-treatment furnace reach 1.19；B, temperature stabilization keeps 3~4h at 860~870 DEG C afterwards, while ammonia, nitrogen and propane are passed through in heat treated stove；C, 1~1.5h of furnace pressure is persistently reduced, the carbon potential in heat-treatment furnace is reduced to 0.8；D, bent axle is put into 0.5~0.8h of quenching oil hardening；Oil cooling after quenching；E, the bent axle after quenching is subjected to 4~4.5h of freezing at a temperature of 50~40 DEG C；F, the bent axle after freezing is tempered 1~2h at 150~200 DEG C.The present invention has the characteristics that to strengthen wearability and prolongs the service life.
Description
Technical field
The present invention relates to auto-parts manufacture field, particularly a kind of automobile crane carbon nitrogen heat treatment method.
Background technology
Bent axle is most important component in engine.It bears the power that connecting rod transmits, and is transformed into torque and passes through song
Axis exports and drives other annexes on engine to work.Bent axle is subject to the gas inertia of the centrifugal force of gyrating mass, mechanical periodicity
The collective effect of power and reciprocal inertia force, makes bent axle bear the effect of flexion torsion load.Therefore it is required that bent axle have it is enough strong
Degree and rigidity, journal surface need are wear-resisting, work is uniform, balance is good.Caused centrifugation during to reduce crankshaft quality and movement
Power, crankshaft journal are often made hollow.Oilhole is provided with each journal surface, to introduce or draw machine oil, is used
To lubricate journal surface.To reduce stress concentration, the junction of trunnion, crank-pin and crank arm is all connected using transition arc
Connect.Bent axle parts work under conditions of sufficiently complex and severe, subject all kinds of higher alternate stresses, mill often occurs
The failure mode such as damage, corrosion.Therefore to the service life of raising bent axle, must be requested that bent axle has higher integral strength.
Therefore, many times, crankshaft surface is heat-treated, to improve its wear-resisting property and intensity, at the heat of conventional bent axle
Reason method is mainly heated at 800~850 DEG C and keeps the temperature, and quenches afterwards, and 2~3h is tempered at 150~200 DEG C.According to this
Kind of heat treatment process, 10~15%, the stress of bent axle cannot be completely eliminated bent axle residual austenite content, in use will
Reduce the service life.
The content of the invention
The purpose of the present invention, is to provide a kind of automobile crane carbon nitrogen heat treatment method.The present invention have enhancing wearability and
The characteristics of prolonging the service life.
What the present invention was realized in.A kind of automobile crane carbon nitrogen heat treatment method, carries out in the steps below：
A, bent axle is put into heat-treatment furnace and is warming up to 850 DEG C~875 DEG C, samming 20~25 minutes, makes carbon potential in heat-treatment furnace
Reach 1.19；
B, temperature stabilization keeps 3~4h at 860~870 DEG C afterwards, while following gas is passed through in heat treated stove：Ammonia, nitrogen
Gas and propane；
C, 1~1.5h of furnace pressure is persistently reduced, the carbon potential in heat-treatment furnace is reduced to 0.8；
D, bent axle is put into 0.5~0.8h of quenching oil hardening；Oil cooling after quenching；
E, the bent axle after quenching is subjected to 4~4.5h of freezing at a temperature of -50~-40 DEG C；
F, the bent axle after freezing is tempered 1~2h at 150~200 DEG C.
In foregoing automobile crane carbon nitrogen heat treatment method, temperature increase rate in the step a for 80~90 DEG C/
min。
In foregoing automobile crane carbon nitrogen heat treatment method, the flow of gas is in the step b：4~5L/h of ammonia；Nitrogen
5~5.5L/h of gas；6~7L/h of propane.
Compared with prior art, the present invention first passes through the processing of lifting/lowering carbon potential, is passed through ammonia again afterwards before being quenched to bent axle
Gas, nitrogen and propane, form one layer of carbonitrided case in crankshaft surface by this way, and then effectively increase crankshaft surface
Wearability；The present invention after quenching again freezes bent axle, by this way, can further improve the intensity of bent axle, together
When the defects of passing through temper again, discharging the internal stress of bent axle, eliminate whole bent axle, further extend bent axle uses the longevity
Life.
Embodiment
Embodiment 1.A kind of automobile crane carbon nitrogen heat treatment method, carries out in the steps below：
A, bent axle is put into heat-treatment furnace and is warming up to 850 DEG C~875 DEG C, samming 20~25 minutes, makes carbon potential in heat-treatment furnace
Reach 1.19；
B, temperature stabilization keeps 3~4h at 860~870 DEG C afterwards, while ammonia, nitrogen and propane are passed through in heat treated stove；
C, 1~1.5h of furnace pressure is persistently reduced, the carbon potential in heat-treatment furnace is reduced to 0.8；
D, bent axle is put into 0.5~0.8h of quenching oil hardening；Oil cooling after quenching；
E, the bent axle after quenching is subjected to 4~4.5h of freezing at a temperature of -50~-40 DEG C；
F, the bent axle after freezing is tempered 1~2h at 150~200 DEG C.
Temperature increase rate in foregoing step a is 80~90 DEG C/min.
The flow of gas is in foregoing step b：4~5L/h of ammonia；5~5.5L/h of nitrogen；6~7L/h of propane.
Embodiment 2.A kind of automobile crane carbon nitrogen heat treatment method, carries out in the steps below：
A, bent axle is put into heat-treatment furnace and is warming up to 860 DEG C, samming 22 minutes, makes carbon potential in heat-treatment furnace reach 1.19；
B, temperature stabilization keeps 3.5h at 865 DEG C afterwards, while ammonia, nitrogen and propane are passed through in heat treated stove；
C, 1~1.5h of furnace pressure is persistently reduced, the carbon potential in heat-treatment furnace is reduced to 0.8；
D, bent axle is put into quenching oil hardening 0.6h；Oil cooling after quenching；
E, the bent axle after quenching is subjected to 4~4.5h of freezing at a temperature of -45 DEG C；
F, the bent axle after freezing is tempered 1~2h at 150~200 DEG C.
Temperature increase rate in foregoing step a is 80~90 DEG C/min.
The flow of gas is in foregoing step b：Ammonia 4.5L/h；Nitrogen 5.2L/h；Propane 6.5L/h.
Embodiment 3.A kind of automobile crane carbon nitrogen heat treatment method, carries out in the steps below：
A, bent axle is put into heat-treatment furnace and is warming up to 850 DEG C DEG C, samming 20 minutes, makes carbon potential in heat-treatment furnace reach 1.19；
B, temperature stabilization keeps 3h at 860 DEG C afterwards, while ammonia, nitrogen and propane are passed through in heat treated stove；
C, furnace pressure 1h is persistently reduced, the carbon potential in heat-treatment furnace is reduced to 0.8；
D, bent axle is put into quenching oil hardening 0.5h；Oil cooling after quenching；
E, the bent axle after quenching is subjected to freezing 4h at a temperature of -50 DEG C；
F, the bent axle after freezing is tempered 1~2h at 150 DEG C.
Temperature increase rate in foregoing step a is 80 DEG C/min.
The flow of gas is in foregoing step b：Ammonia 4L/h；Nitrogen 5.5L/h；Propane 6L/h.
Embodiment 4.A kind of automobile crane carbon nitrogen heat treatment method, carries out in the steps below：
A, bent axle is put into heat-treatment furnace and is warming up to 875 DEG C, samming 225 minutes, makes carbon potential in heat-treatment furnace reach 1.19；
B, temperature stabilization keeps 4h at 870 DEG C afterwards, while ammonia, nitrogen and propane are passed through in heat treated stove；
C, furnace pressure 1.5h is persistently reduced, the carbon potential in heat-treatment furnace is reduced to 0.8；
D, bent axle is put into quenching oil hardening 0.8h；Oil cooling after quenching；
E, the bent axle after quenching is subjected to freezing 4.5h at a temperature of -40 DEG C；
F, the bent axle after freezing is tempered 2h at 200 DEG C.
Temperature increase rate in foregoing step a is 90 DEG C/min.
The flow of gas is in foregoing step b：Ammonia 5L/h；Nitrogen 5.5L/h；Propane 7L/h.
Claims (3)
- A kind of 1. automobile crane carbon nitrogen heat treatment method, it is characterised in that：Carry out in the steps below：A, bent axle is put into heat-treatment furnace and is warming up to 850 DEG C~875 DEG C, samming 20~25 minutes, makes carbon potential in heat-treatment furnace Reach 1.19；B, temperature stabilization keeps 3~4h at 860~870 DEG C afterwards, while ammonia, nitrogen and propane are passed through in heat treated stove；C, 1~1.5h of furnace pressure is persistently reduced, the carbon potential in heat-treatment furnace is reduced to 0.8；D, bent axle is put into 0.5~0.8h of quenching oil hardening；Oil cooling after quenching；E, the bent axle after quenching is subjected to 4~4.5h of freezing at a temperature of -50~-40 DEG C；F, the bent axle after freezing is tempered 1~2h at 150~200 DEG C.
- 2. automobile crane carbon nitrogen heat treatment method as claimed in claim 1, it is characterised in that：Temperature liter in the step a High-speed is 80~90 DEG C/min.
- 3. automobile crane carbon nitrogen heat treatment method as claimed in claim 1, it is characterised in that：The stream of gas in the step b Measure and be：4~5L/h of ammonia；5~5.5L/h of nitrogen；6~7L/h of propane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610964826.9A CN108004499A (en) | 2016-10-28 | 2016-10-28 | A kind of automobile crane carbon nitrogen heat treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610964826.9A CN108004499A (en) | 2016-10-28 | 2016-10-28 | A kind of automobile crane carbon nitrogen heat treatment method |
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| Publication Number | Publication Date |
|---|---|
| CN108004499A true CN108004499A (en) | 2018-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610964826.9A Pending CN108004499A (en) | 2016-10-28 | 2016-10-28 | A kind of automobile crane carbon nitrogen heat treatment method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109182958A (en) * | 2018-11-22 | 2019-01-11 | 福泉市发隆钢构有限公司 | A kind of steel structure surface processing method |
| CN109266999A (en) * | 2018-11-23 | 2019-01-25 | 福泉市发隆钢构有限公司 | A kind of steel structure surface processing method |
| CN112501544A (en) * | 2020-08-27 | 2021-03-16 | 苏州新豪轴承股份有限公司 | Bearing part machining process |
-
2016
- 2016-10-28 CN CN201610964826.9A patent/CN108004499A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109182958A (en) * | 2018-11-22 | 2019-01-11 | 福泉市发隆钢构有限公司 | A kind of steel structure surface processing method |
| CN109266999A (en) * | 2018-11-23 | 2019-01-25 | 福泉市发隆钢构有限公司 | A kind of steel structure surface processing method |
| CN112501544A (en) * | 2020-08-27 | 2021-03-16 | 苏州新豪轴承股份有限公司 | Bearing part machining process |
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Application publication date: 20180508 |