CN109852781A - A kind of automobile engine cubing heat treatment process - Google Patents
A kind of automobile engine cubing heat treatment process Download PDFInfo
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- CN109852781A CN109852781A CN201811542269.7A CN201811542269A CN109852781A CN 109852781 A CN109852781 A CN 109852781A CN 201811542269 A CN201811542269 A CN 201811542269A CN 109852781 A CN109852781 A CN 109852781A
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Abstract
Disclosed by the invention to belong to technical field of automobile parts, specially a kind of automobile engine cubing heat treatment process, specific step is as follows for the technique of the technique: S1: quenching, and hardening heat is 850 DEG C, soaking time 25min；S2: tempering, tempering temperature are 560 DEG C, soaking time 1h；S3: stress relief annealing, annealing temperature are 550 DEG C, soaking time 2.5h；S4；High-frequency quenching, hardening heat are 860~930 DEG C, soaking time 1.5h；S5；Lonneal, tempering temperature are 160 DEG C, soaking time 1.5h；By successively being quenched, being tempered the workpiece after processing, stress relief annealing, high-frequency quenching and lonneal, workpiece surface is set to form hardness in 51~53HRC and the sorbite of tissue stabilization, it is lower to avoid current its hardness of automobile engine protective metal shell, it is difficult to bear the impact force problem that metal block splashes when cylinder bursts in automobile engine detection process.
Description
Technical field
Disclosed by the invention to belong to technical field of automobile parts, specially a kind of automobile engine cubing is heat-treated work
Skill.
Background technique
Automobile engine is that the machine of power is provided for automobile, is the heart of automobile, influences dynamic property, the economy of automobile
And the feature of environmental protection.According to power resources difference, it is electronic that automobile engine can be divided into diesel engine, petrol engine, electric car
Machine and hybrid power etc., common gasoline engine and diesel engine belong to reciprocating piston internal combustion engine, are by the chemical energy of fuel
It is converted into the mechanical energy of piston motion and external output power.Petrol engine rotational speed is high, and quality is small, and noise is small, starts and is easy, manufacture
It is at low cost;Diesel engine compression ratio is big, and the thermal efficiency is high, and economic performance and emission performance are all better than gasoline engine, the gas of car engine
Cylinder is to be used for burns gasoline, and push the important component of piston motion, is needed in automobile engine production process to cylinder
It bears pressure to be detected, splatter when cylinder bursts in order to prevent in the detection process can generally increase on the outside of cubing
One layer of protective metal shell, current its hardness of automobile engine protective metal shell are lower, it is difficult to bear to car engine machine testing mistake
The impact force that metal block splashes when cylinder bursts in journey, for this purpose, we have proposed a kind of automobile engine cubing heat treatment process
It comes into operation, to solve the above problems.
Summary of the invention
The purpose of the present invention is to provide a kind of automobile engine cubing heat treatment process, to solve in above-mentioned background technique
Current its hardness of automobile engine protective metal shell proposed is lower, it is difficult to bear the cylinder in automobile engine detection process
The impact force problem that metal block splashes when explosion.
To achieve the above object, the invention provides the following technical scheme: a kind of automobile engine cubing heat treatment process, is somebody's turn to do
Specific step is as follows for the technique of technique:
S1: quenching, hardening heat are 850 DEG C, soaking time 25min；
S2: tempering, tempering temperature are 560 DEG C, soaking time 1h；
S3: stress relief annealing, annealing temperature are 550 DEG C, soaking time 2.5h；
S4；High-frequency quenching, hardening heat are 860~930 DEG C, soaking time 1.5h；
S5；Lonneal, tempering temperature are 160 DEG C, soaking time 1.5h；
Described step S1, S2, S3, S4 and S5 include the following steps:
S11: heating；
S12: heat preservation；
S13: cooling；
Preferably, the step S1 and S2 is heated and is kept the temperature to workpiece in the chamber type electric resistance furnace of 40kw, and the step S1 adds
The hardening media selected in a length of 5min when thermal process, the step S1 and step S2 is quenching oil.
Preferably, by the way of standing that workpiece is cold in a length of 10min when being heated in the step S3, the step S3
But to room temperature.
Preferably, it selects GP-25A high-frequency quenching furnace to quench workpiece in the step S4, is adopted in the step S4
Workpiece is cooled to room temperature with the mode placed is stood.
Preferably, for cooling oil, the heating time in the step S5 is the cooling medium used in the step S5
10min。
Compared with prior art, the beneficial effects of the present invention are: by the way that the workpiece after processing is successively quenched, is returned
Fire, stress relief annealing, high-frequency quenching and lonneal make workpiece surface form hardness in 51~53HRC and the rope of tissue stabilization
Family name's body it is lower to avoid current its hardness of automobile engine protective metal shell, it is difficult to bear to car engine machine examination
The impact force problem that metal block splashes when cylinder bursts during survey.
Detailed description of the invention
Fig. 1 is process flow chart of the invention；
Fig. 2 is temperature range coordinate diagram of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The present invention provides a kind of technical solution: a kind of automobile engine cubing heat treatment process is used for, referring to Fig. 1, should
Specific step is as follows for the technique of technique:
S1: quenching, hardening heat are 850 DEG C, soaking time 25min；Hardness can be obtained between 51~53HRC,
S2: tempering, tempering temperature are 560 DEG C, soaking time 1h, since the martensitic structure obtained after quenching is not steady enough
It is fixed, obtain stable tissue therefore, it is necessary to high tempering, sorbite, obtained after modulation sorbite product grain with it is fine and closely woven, have good
Good hardness and toughness, hardness number are evenly distributed in 32HRC or so, and hardness number, can meet the hard of automobile engine cubing
Degree demand；
S3: stress relief annealing, annealing temperature are 550 DEG C, soaking time 2.5h；It can remove inside workpiece nubbin to answer
Power；
S4: high-frequency quenching, hardening heat are 860~930 DEG C, soaking time 1.5h；Make in workpiece surface certain depth
Martensitic structure is obtained, and its center portion still remains the structural state before surface hardening, center portion hard and wear-resisting to obtain superficial layer
There is the workpiece of enough plasticity, toughness again；
S5: lonneal, tempering temperature are 160 DEG C, soaking time 1.5h；When removing due to high-frequency quenching, austenite
Uneven components, austenite grain are refined, and have residual compressive stress the problem of, tempering temperature should be than being commonly tempered
Temperature is low, after avoidable surface hardening the problem of the decline of hardness.
Described step S1, S2, S3, S4 and S5 include the following steps:
S11: heating；
S12: heat preservation；
S13: cooling；
The step S1 and S2 is heated and is kept the temperature to workpiece in the chamber type electric resistance furnace of 40kw, when the step S1 heating process
The hardening media selected in a length of 5min, the step S1 and step S2 is quenching oil, and when quenching, cooling medium selects oil quenching,
Oily cooling rate is most fast at 500-350 DEG C, under it is slow.This cooling characteristics be it is more satisfactory, make the supercooling Ovshinsky of steel
Body tissue has most fast cooling rate in most unstable region, in this way, can get maximum hard formation depth；And Shi body limited proportionality has
The smallest cooling velocity can be such that stress minimizes, therefore reduce strain cracking tendency, be conducive to subsequent plus lower and processing, institute
A length of 10min when heating in step S3 is stated, workpiece is cooled to room temperature by the way of standing in the step S3, workpiece is adopted
New residual stress can be effectively prevent generating with being slowly cooled to room temperature, GP-25A high-frequency quenching furnace pair is selected in the step S4
Workpiece is quenched, and is cooled to room temperature workpiece by the way of standing placement in the step S4, the workpiece after high-frequency quenching
Surface can form tiny acicular martensite, and the cooling medium used in the step S5 is cooling oil, in the step S5
Heating time is 10min.
Specifically in use, the protective metal shell of the production automobile engine cubing processed is removed and placed in case
It is heated to 850 DEG C in formula resistance furnace, and keeps the temperature 25min, is cooled to room temperature using cooling oil, lath martensite can be obtained, then
560 DEG C are heated to workpiece to be placed in chamber type electric resistance furnace, and keeps the temperature 1h, and be cooled to room temperature using cooling oil, can get group
Knit stable sorbite, after modulation obtain sorbite product grain with it is fine and closely woven, have good hardness and toughness, hardness number is hard
Degree is in 51~53HRC, and hardness number is evenly distributed, and can meet the changing firmness requirements of automobile engine cubing, avoids current vapour
Its hardness of car engine protective metal shell is lower, it is difficult to bear metal block when cylinder bursts in automobile engine detection process and fly
The impact force problem splashed then is heated to 555 DEG C workpiece to be placed in chamber type electric resistance furnace, and keeps the temperature 2.5h, then using quiet
Workpiece is cooled to room temperature by the mode set, and can remove inside workpiece nubbin stress, workpiece is then again placed in box electricity
860~930 DEG C are heated in resistance furnace, and keeps the temperature 1.5h, is then cooled to room temperature workpiece by the way of then using standing,
Tiny acicular martensite can be carefully obtained in workpiece surface, make workpiece wearability and fatigue resistance to effectively improving, finally
Workpiece is placed in chamber type electric resistance furnace and is heated to 160 DEG C, and keeps the temperature 1.5h, is finally cooled to room temperature using cooling tabletting, with drop
Stress remaining in workpiece after low high-frequency quenching.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (5)
1. a kind of automobile engine cubing heat treatment process, it is characterised in that: specific step is as follows for the technique of the technique:
S1: quenching, hardening heat are 850 DEG C, soaking time 25min；
S2: tempering, tempering temperature are 560 DEG C, soaking time 1h；
S3: stress relief annealing, annealing temperature are 550 DEG C, soaking time 2.5h；
S4；High-frequency quenching, hardening heat are 860~930 DEG C, soaking time 1.5h；
S5；Lonneal, tempering temperature are 160 DEG C, soaking time 1.5h；
Described step S1, S2, S3, S4 and S5 include the following steps:
S11: heating；
S12: heat preservation；
S13: cooling.
2. a kind of automobile engine cubing heat treatment process according to claim 1, it is characterised in that: the step S1
Workpiece is heated and is kept the temperature in the chamber type electric resistance furnace of 40kw with S2, when step S1 heating process a length of 5min, it is described
The hardening media selected in step S1 and step S2 is quenching oil.
3. a kind of automobile engine cubing heat treatment process according to claim 1, it is characterised in that: in the step S3
Workpiece is cooled to room temperature by the way of standing in a length of 10min when heating, the step S3.
4. a kind of automobile engine cubing heat treatment process according to claim 1, it is characterised in that: in the step S4
It selects GP-25A high-frequency quenching furnace to quench workpiece, is cooled to workpiece by the way of standing placement in the step S4
Room temperature.
5. a kind of automobile engine cubing heat treatment process according to claim 1, it is characterised in that: the step S5
For the middle cooling medium used for cooling oil, the heating time in the step S5 is 10min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811542269.7A CN109852781A (en) | 2018-12-17 | 2018-12-17 | A kind of automobile engine cubing heat treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811542269.7A CN109852781A (en) | 2018-12-17 | 2018-12-17 | A kind of automobile engine cubing heat treatment process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109852781A true CN109852781A (en) | 2019-06-07 |
Family
ID=66891288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811542269.7A Pending CN109852781A (en) | 2018-12-17 | 2018-12-17 | A kind of automobile engine cubing heat treatment process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109852781A (en) |
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2018
- 2018-12-17 CN CN201811542269.7A patent/CN109852781A/en active Pending
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Application publication date: 20190607 |
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| RJ01 | Rejection of invention patent application after publication |