CN106702098A - Hardening and tempering process for 40Cr steel camshaft - Google Patents
Hardening and tempering process for 40Cr steel camshaft Download PDFInfo
- Publication number
- CN106702098A CN106702098A CN201611268426.0A CN201611268426A CN106702098A CN 106702098 A CN106702098 A CN 106702098A CN 201611268426 A CN201611268426 A CN 201611268426A CN 106702098 A CN106702098 A CN 106702098A
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- CN
- China
- Prior art keywords
- camshaft
- hardening
- steel
- cracks
- tempering process
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- 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
Abstract
Camshafts are important parts in engines, casting forming is usually adopted for some cast iron camshafts, but the cast iron camshafts are short in service life. 40Cr is medium-carbon hardened and tempered steel and has optimal comprehensive mechanical performance, and the hardened and tempered 40Cr is used for manufacturing a mechanical part which bears a medium load and works at a medium speed. Because of the particularity of the shapes of cams, when the 40Cr is used as a material of a camshaft, the probability that cracks appear during hardening and tempering of the camshaft is 80%, the number of the cracks with the lengths being 30 mm or above and the depths being 5 mm or above accounts for 40% of the total number of the cracks, the cracks are difficult to remove during subsequent machining, and finally product scrapping is caused. Therefore, in the hardening and tempering process of the 40Cr steel camshaft, especially the tip circle portions of the cams, stress nonuniformity is prone to occurring, and the cracks are generated. The invention provides a hardening and tempering process for the 40Cr steel camshaft. The hardening and tempering process comprises the following steps that the 40Cr steel camshaft is put into a heating furnace and heated to 800-820 DEG C; and the camshaft is subjected to heat preservation for 12-15 min in the heating furnace.
Description
Technical field
The present invention relates to technical field of metal heat treatment, and in particular to a kind of 40Cr steels camshaft hardening and tempering process.
Background technology
Camshaft is the important component in engine, for the camshaft of some cast iron classes, typically using casting, but
This kind of camshaft life-span is not high；40Cr belongs to middle carbon modulation steel, conditioned rear for manufacturing with optimal comprehensive mechanical property
Bear the machine components of moderate duty and medium speed's work, due to the particularity of cam face, when with 40Cr as camshaft
Material when, the quenched probability for crackle occur of camshaft be 80%, and these crackles in, length 30mm, more than depth 5mm
Account for 40%, these crackles are all to be difficult to eliminate in following process, ultimately result in product rejection.Therefore existing 40Cr steels
, particularly in the tip circle part of cam, easily there is Stress non-homogeneity during quenched in camshaft, cracks.
The content of the invention
In order to solve existing 40Cr steels camshaft during quenched, there is asking for larger crackle in the tip circle position of cam
Topic, the present invention provides a kind of 40Cr steels camshaft hardening and tempering process.
The present invention is achieved by the following technical solution：A kind of 40Cr steels camshaft hardening and tempering process, including it is following
Step：
S1：40Cr steel camshafts are placed into heating furnace, 40Cr steels camshaft is carried out to be heated to 800 DEG C~820 DEG C；
S2：Insulation 12min~15min is carried out in heating furnace；
S3：40Cr steel camshafts after insulation are put into quenching liquid to carry out being cooled to normal temperature, and the quenching liquid is flowing
Oiliness quenching liquid；
S4：40Cr steel camshafts after step S3 treatment are heated to temperature for 560 DEG C~580 DEG C, soaking time is 60min
~80min；
S5：40Cr steel camshafts after step S4 treatment are cooled to 200 DEG C~250 DEG C, 40min~60min is incubated；
S6：40Cr steel camshafts after step S5 treatment are cooled to normal temperature.
Further, the flow velocity of the oiliness quenching liquid of the flowing is 12m/min~19m/min.
Further, the heating furnace is Medium Frequency Induction Heating Furnace.
The beneficial effect comprise that：800 DEG C~820 DEG C are heated to by by quenched parts, insulation 12min~
15min, while be put into oiliness quenching liquid the 40Cr steel camshafts in high temperature to carry out being cooled to normal temperature, such camshaft is obtained
To more satisfactory martensitic structure；Camshaft after by quenching is tempered, first by camshaft be heated to 560 DEG C~
580 DEG C, soaking time is 60min~80min, and organization internal is because of the internal stress of the uneven generation of cooling velocity after eliminating quenching；
In order to prevent temper brittleness, camshaft is cooled to 200 DEG C~250 DEG C after tempering, carry out again insulation 40min~
60min, it is ensured that there is good plasticity and toughness after tempering.According to above-mentioned technique, 40Cr steel camshafts are solved quenched
In mistake, there is the problem of larger crackle in the tip circle position of cam.
Brief description of the drawings
Fig. 1 is a kind of camshaft part schematic diagram of 40Cr steels camshaft hardening and tempering process of the invention.
Fig. 2 is a kind of 40Cr steels camshaft hardening and tempering process schematic flow sheet of the invention.
In figure：（1）Camshaft journal,（2）Camshaft journal,（3）Camshaft journal.
Specific embodiment
To describe in detail in conjunction with specific embodiments with reference to the accompanying drawings below：
A kind of 40Cr steels camshaft hardening and tempering process, comprises the following steps：
S1：40Cr steel camshafts are placed into heating furnace, 40Cr steels camshaft is carried out to be heated to 800 DEG C~820 DEG C；
S2：Insulation 12min~15min is carried out in heating furnace；
S3：40Cr steel camshafts after insulation are put into quenching liquid to carry out being cooled to normal temperature, and the quenching liquid is flowing
Oiliness quenching liquid；
S4：40Cr steel camshafts after step S3 treatment are heated to temperature for 560 DEG C~580 DEG C, soaking time is 60min
~80min；
S5：40Cr steel camshafts after step S4 treatment are cooled to 200 DEG C~250 DEG C, 40min~60min is incubated；
S6：40Cr steel camshafts after step S5 treatment are cooled to normal temperature.
The present invention in practice, the present embodiment use camshaft journal（1）Size is φ 80mm, cam base circle
（2）Radius is R50mm, and cam eccentricity is 23mm.800 DEG C~820 DEG C are heated to by by quenched parts, insulation 12min~
15min, in the present embodiment, 810 DEG C~813 DEG C is heated to by 40Cr steel camshafts, 13min is incubated, to this after insulation
40Cr steel camshafts carry out being cooled to normal temperature in being put into oiliness quenching liquid, are detected by crystalline phase, and quenching obtains the geneva of sheet
Body tissue, the case hardness for detecting camshaft is HRC63；Camshaft after by quenching is tempered, first by camshaft
560 DEG C~580 DEG C are heated to, soaking time is 60min~80min, in the present embodiment, 40Cr steel camshafts is heated to
570 DEG C~572 DEG C, 70min is incubated, organization internal is because of the internal stress of the uneven generation of cooling velocity after eliminating quenching；In order to anti-
Only there is temper brittleness, camshaft is cooled to 200 DEG C~250 DEG C after tempering, insulation 40min~60min carried out again,
In the present embodiment, when camshaft is cooled to 220 DEG C after tempering, insulation 50min is carried out again, then by the 40Cr after insulation
Steel camshaft is cooled to normal temperature in atmosphere；Crystalline phase detection is carried out to camshaft after cooling, after being tempered according to this technique
The tissue for arriving mainly tempered sorbite and part bainite, the case hardness for detecting camshaft is HRC60, and centre hardness is
HRC56；By ultrasound examination find that it is 50% the probability of crackle occur, without finding that length 30mm, more than depth 5mm split
Line, solves existing 40Cr steels camshaft during quenched, the tip circle of cam（3）There is the problem of larger crackle in position, has
Ensure that product quality to effect.
Further, in order to improve heat exchange efficiency, the camshaft structural state after cooling is improved, the oiliness of the flowing is quenched
The flow velocity of fiery liquid is 12m/min~19m/min, and cooling velocity is 15m/min in the present embodiment.
Further, it is ensured that heating uniformity and firing rate, the heating furnace is Medium Frequency Induction Heating Furnace, in this reality
Apply in example, it is 20K HZ to use frequency.
It should be understood that embodiment is only illustrative of the invention and is not intended to limit the scope of the invention.In addition, it is to be understood that readding
Read after the content of instruction of the present invention, those skilled in the art can make any various changes and modification to the present invention, these
The equivalent form of value equally falls within the application appended claims and is limited.
Claims (3)
1. a kind of 40Cr steels camshaft hardening and tempering process, it is characterised in that comprise the following steps：
S1：40Cr steel camshafts are placed into heating furnace, 40Cr steels camshaft is carried out to be heated to 800 DEG C~820 DEG C；
S2：Insulation 12min~15min is carried out in heating furnace；
S3：40Cr steel camshafts after insulation are put into quenching liquid to carry out being cooled to normal temperature, and the quenching liquid is flowing
Oiliness quenching liquid；
S4：40Cr steel camshafts after step S3 treatment are heated to temperature for 560 DEG C~580 DEG C, soaking time is 60min
~80min；
S5：40Cr steel camshafts after step S4 treatment are cooled to 200 DEG C~250 DEG C, 40min~60min is incubated；
S6：40Cr steel camshafts after step S5 treatment are cooled to normal temperature.
2. a kind of 40Cr steels camshaft hardening and tempering process according to claim 1, it is characterised in that：The oiliness of the flowing
The flow velocity of quenching liquid is 12m/min~19m/min.
3. a kind of 40Cr steels camshaft hardening and tempering process according to claim 1, it is characterised in that：During the heating furnace is
Frequency induction heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611268426.0A CN106702098A (en) | 2016-12-31 | 2016-12-31 | Hardening and tempering process for 40Cr steel camshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611268426.0A CN106702098A (en) | 2016-12-31 | 2016-12-31 | Hardening and tempering process for 40Cr steel camshaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106702098A true CN106702098A (en) | 2017-05-24 |
Family
ID=58905761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611268426.0A Pending CN106702098A (en) | 2016-12-31 | 2016-12-31 | Hardening and tempering process for 40Cr steel camshaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106702098A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110564924A (en) * | 2019-10-30 | 2019-12-13 | 江苏聚源电气有限公司 | Quenching and tempering and integral quenching process method for 40CrMnMo steel |
| CN114277238A (en) * | 2021-12-22 | 2022-04-05 | 安翼机器人(江苏)有限公司 | Shaft treatment process special for fire-fighting robot |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104232875A (en) * | 2014-07-17 | 2014-12-24 | 北京科技大学 | Heat treatment process of bearing ring (3m) of shield tunneling machine |
| CN105695701A (en) * | 2014-11-28 | 2016-06-22 | 重庆市巴南区仁荣机械厂 | 40Cr quenching and tempering technology |
-
2016
- 2016-12-31 CN CN201611268426.0A patent/CN106702098A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104232875A (en) * | 2014-07-17 | 2014-12-24 | 北京科技大学 | Heat treatment process of bearing ring (3m) of shield tunneling machine |
| CN105695701A (en) * | 2014-11-28 | 2016-06-22 | 重庆市巴南区仁荣机械厂 | 40Cr quenching and tempering technology |
Non-Patent Citations (3)
| Title |
|---|
| 张海: "回火出炉空冷时温度对40Cr钢调质大锻件表面残余应力的影响", 《机械工程材料》 * |
| 张银会等: "高强韧性桥梁用钢拉杆的热处理", 《铸造技术》 * |
| 谭玉华: "减少和阻止回火脆性方法的探讨", 《上海机械》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110564924A (en) * | 2019-10-30 | 2019-12-13 | 江苏聚源电气有限公司 | Quenching and tempering and integral quenching process method for 40CrMnMo steel |
| CN114277238A (en) * | 2021-12-22 | 2022-04-05 | 安翼机器人(江苏)有限公司 | Shaft treatment process special for fire-fighting robot |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170524 |