CN106350641A - Heat treatment method for improving service life of cold-working mold - Google Patents
Heat treatment method for improving service life of cold-working mold Download PDFInfo
- Publication number
- CN106350641A CN106350641A CN201610765464.0A CN201610765464A CN106350641A CN 106350641 A CN106350641 A CN 106350641A CN 201610765464 A CN201610765464 A CN 201610765464A CN 106350641 A CN106350641 A CN 106350641A
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- CN
- China
- Prior art keywords
- heat treatment
- machining
- hardening
- cold
- quenching
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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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a heat treatment method for improving the service life of a cold-working mold. The method comprises the steps of performing pretreatment via high temperature solution hardening and high temperature tempering, and final hardening treatment after machining and forming. According to the method, after preheating treatment, the mold can produce many crystal defects and substructures; the average diameter of carbides is 0.9 micrometers; the carbides are round and in discrete distribution; and the structure is a sorbite structure. The structure obtained by the final hardening after the machining and the forming is a martensite plus retained austenite structure. The specific volume of the sorbite structure obtained after the pretreatment is very close to that of the martensite plus austenite structure obtained after the final hardening after the machining and the forming; and structure deformation caused by a specific volume difference of the structure before and after the hardening is reduced, so that the service life of the mold after hardening is prolonged.
Description
Technical field
The invention belongs to technical field of metal heat treatment, it is related to a kind of heat treatment side improving cold-working die life
Method.
Background technology
In the manufacture of automobile axle, need substantial amounts of cold-working mould, cr12mov material typically selected by such mould.
Cr12mov belongs to Lay formula steel, although this kind of steel has preferably pressure yield strength, wearability and good quenching degree, by
There is substantial amounts of eutectic carbide in Yu Gangzhong, the particularly undissolved carbide inhomogeneities after heavy in section steel quenching are serious, greatly
Reduce greatly the toughness of material, easily cause tipping in use, the initial failure such as fracture, ftracture, and have impact on mould
Service life.Tradition is used spheroidizing as the pretreatment before the quenching of cr12mov mould steel, and enters for the mould after quenching
Row repeatedly jumping-up, pulling come to improve cr12mov mould steel quenching after undissolved carbide inhomogeneities.But at the method
Organizational structure after reason, shape, size keep former forging state substantially, and actual effect is unsatisfactory.
Therefore, cold-working mould preconditioning technique is also treated to improve further.
Content of the invention
It is an object of the invention to improve carbide size, distribution, shape in steel by a kind of heat treatment technics, to
Improve the mold use life-span, thus providing and a kind of heat treatment method improving cold-working die life.
The present invention is achieved in that
A kind of improve cold-working die life heat treatment method, initially with high temperature solid solution quenching and high tempering quenched
Carry out pretreatment, finally again through final Quenching Treatment after machining shapes.
Further, the quenched pretreatment concrete technology flow process of the quenching of described high temperature solid solution and high tempering is: by mould plus
Heat to 1130 ± 10 DEG C, be incubated 1.5 ± 0.15h, carry out water-cooled, be cooled to 200 DEG C, be tempered to 750 ± 10 DEG C, insulation 3 ±
0.3h, stove is cooled to 50 ± 2 DEG C, then is air cooled to room temperature；
Machining is finally quenched after shaping, and its heat treatment flow process is: is heated to 1020 ± 10 DEG C, carries out oil cooling, work as cooling
During to 150 ± 5 DEG C, be tempered to temperature be 200 ± 10 DEG C, be incubated 3 ± 0.3h, be air cooled to room temperature, then be tempered to temperature be 200 ±
10 DEG C, it is incubated 3 ± 0.3h, times of tempering is 2-3 time.
Before the quenching of cr12 type cold work die steel, the traditional way of pretreatment is spheroidizing after forging, and the present invention is to be replaced with quenched
For spheroidizing as the pretreatment before quenching.
It is an advantage of the current invention that after the pre-heat treatment, mould can form many crystal defects and substructure, carbide is average
A diameter of 0.9 μm, rounding and Discrete Distribution, and it is organized as sorbite tissue.Finally quench after machining shaping the tissue obtaining
For martensite+retained austenite.Final quenching after the sorbite tissue specific volume that wherein pretreatment obtains is shaped with machining obtains
Martensite+austenite structure specific volume closely, decrease due to quenching before and after tissue specific volume difference and produce metaplasia,
Thus improving the service life after die quenching.
Brief description
Fig. 1 is the quenched pretreatment temperature time plot of the embodiment of the present invention 1；
Fig. 2 is the final hardening heat time plot of the embodiment of the present invention 1；
Fig. 3 is the metallographic structure figure after the quenching of the embodiment of the present invention 1 high temperature solid solution and high tempering；
Fig. 4 is the metallographic structure figure after final quenching after the embodiment of the present invention 1 machining shapes.
Specific embodiment
The present invention passes through the following examples and can make progressive description to the present invention, however, the scope of the present invention is simultaneously
It is not limited to following embodiments.
Embodiment 1:
A kind of heat treatment technics improving die life has been applied to edger.Edger adopts high temperature solid solution quenching+height
Final Quenching Treatment after the quenched pretreatment of temperature tempering and machining shaping.Pretreatment makes carbide diameter be less than 1 μm, shape
Shape is in rounding, Discrete Distribution, and makes its last tissue specific volume close with the tissue specific volume after final quenching, before reducing because of quenching
Afterwards tissue specific volume difference and produce metaplasia, thus improving the service life of edger, this mold use life-span from
12000h is promoted to 48000h.
The quenched pretreatment concrete technology flow process of high temperature solid solution quenching+high tempering is that edger is heated to 1130 ± 10 DEG C,
Insulation 1.5h quenches and is tempered to 750 ± 10 DEG C into boiling water, and insulation 3h stove is cooled to 50 DEG C and is air cooled to room temperature again.During its temperature
Half interval contour is as shown in Figure 1.
The sorbite tissue obtaining after high temperature solid solution quenching and high tempering is as shown in Figure 3.Wherein in sorbite tissue
A diameter of 0.9 μm of carbide, shape are in rounding, Discrete Distribution.
After edger machining shapes, final quenching technical flow process is: is heated to 1020 ± 10 DEG C and quenches into oil temperature
Degree is down to 150 DEG C and is tempered 2-3 time, and temperature is 200 DEG C, is incubated 3h.Its temperature time curve is as shown in Figure 2.
Metallographic structure figure such as Fig. 4 after machining final quenching after shaping, metallographic structure figure therein is martensite+remnants
Austenite.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (2)
1. a kind of improve cold-working die life heat treatment method it is characterised in that initially with high temperature solid solution quenching and
The quenched of high tempering carries out pretreatment, finally again through final Quenching Treatment after machining shapes.
2. a kind of heat treatment method improving cold-working die life according to claim 1 is it is characterised in that described
The quenched pretreatment concrete technology flow process of high temperature solid solution quenching and high tempering is: mould is heated to 1130 ± 10 DEG C, insulation
1.5 ± 0.15h, carries out water-cooled, is cooled to 200 DEG C, is tempered to 750 ± 10 DEG C, is incubated 3 ± 0.3h, and stove is cooled to 50 ± 2 DEG C, then
It is air cooled to room temperature；
Machining is finally quenched after shaping, and its heat treatment flow process is: is heated to 1020 ± 10 DEG C, carries out oil cooling, work as cooling
During to 150 ± 5 DEG C, be tempered to temperature be 200 ± 10 DEG C, be incubated 3 ± 0.3h, be air cooled to room temperature, then be tempered to temperature be 200 ±
10 DEG C, it is incubated 3 ± 0.3h, times of tempering is 2-3 time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610765464.0A CN106350641A (en) | 2016-08-31 | 2016-08-31 | Heat treatment method for improving service life of cold-working mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610765464.0A CN106350641A (en) | 2016-08-31 | 2016-08-31 | Heat treatment method for improving service life of cold-working mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106350641A true CN106350641A (en) | 2017-01-25 |
Family
ID=57856023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610765464.0A Pending CN106350641A (en) | 2016-08-31 | 2016-08-31 | Heat treatment method for improving service life of cold-working mold |
Country Status (1)
| Country | Link |
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| CN (1) | CN106350641A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109706292A (en) * | 2018-11-27 | 2019-05-03 | 曾华 | A kind of drill produced technique reducing crystal defect |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101381843A (en) * | 2008-10-17 | 2009-03-11 | 山西太钢不锈钢股份有限公司 | 5Cr5MoWSiV cold roller and heat treatment method thereof |
| CN102181613A (en) * | 2011-03-15 | 2011-09-14 | 新乡市凯迪轧辊有限公司 | Heat treatment method for large-scale Cr12Mov workpiece |
| CN102400048A (en) * | 2010-09-15 | 2012-04-04 | 宝山钢铁股份有限公司 | Cold work roll steel for high-strength steel rolling, cold work roll and its manufacturing method |
| CN103409688A (en) * | 2013-07-10 | 2013-11-27 | 中钢集团邢台机械轧辊有限公司 | Large forged high-speed steel cold roll and manufacturing method thereof |
| CN104946982A (en) * | 2014-03-25 | 2015-09-30 | 宝山钢铁股份有限公司 | Wide thick plate hot-straightening machine working roll and manufacturing method thereof |
-
2016
- 2016-08-31 CN CN201610765464.0A patent/CN106350641A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101381843A (en) * | 2008-10-17 | 2009-03-11 | 山西太钢不锈钢股份有限公司 | 5Cr5MoWSiV cold roller and heat treatment method thereof |
| CN102400048A (en) * | 2010-09-15 | 2012-04-04 | 宝山钢铁股份有限公司 | Cold work roll steel for high-strength steel rolling, cold work roll and its manufacturing method |
| CN102181613A (en) * | 2011-03-15 | 2011-09-14 | 新乡市凯迪轧辊有限公司 | Heat treatment method for large-scale Cr12Mov workpiece |
| CN103409688A (en) * | 2013-07-10 | 2013-11-27 | 中钢集团邢台机械轧辊有限公司 | Large forged high-speed steel cold roll and manufacturing method thereof |
| CN104946982A (en) * | 2014-03-25 | 2015-09-30 | 宝山钢铁股份有限公司 | Wide thick plate hot-straightening machine working roll and manufacturing method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109706292A (en) * | 2018-11-27 | 2019-05-03 | 曾华 | A kind of drill produced technique reducing crystal defect |
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Application publication date: 20170125 |