CN102732699A - Heat treatment process for powder part - Google Patents
Heat treatment process for powder part Download PDFInfo
- Publication number
- CN102732699A CN102732699A CN201210244975XA CN201210244975A CN102732699A CN 102732699 A CN102732699 A CN 102732699A CN 201210244975X A CN201210244975X A CN 201210244975XA CN 201210244975 A CN201210244975 A CN 201210244975A CN 102732699 A CN102732699 A CN 102732699A
- Authority
- CN
- China
- Prior art keywords
- powder spare
- powder part
- powder
- treatment process
- cooling
- Prior art date
- 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.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a heat treatment process for a powder part, which is a process for performing high-frequency heat treatment on the powder part. The process comprises the following steps of: 1), preheating: preheating the powder part; 2) air cooling: naturally cooling the powder part for 0.1-1 second in the air; 3) heating: heating the powder part to 800-900 DEG C; 4) air cooling: naturally cooling the powder part for 0.1-2 seconds in the air; and 5) cooling: putting the powder part in quenching liquid to cool for 3-5 seconds. According to precious experience obtained from repeated experiments, the temperature difference inside and outside the powder part in the heating process is reduced through adding the steps of air cooling so as to reduce the possibility of occurrence of cracks, and the control temperature and the keeping time in each step are compared through repeated experiment, so that the optimal effect is achieved. The heat treatment process for the powder part is the improvement based on the conventional equipment and process, and the heat treatment process has the advantages of simplicity, easiness for operation, high pass percentage and the like.
Description
Technical field
The present invention relates to a kind of metal heat treatmet technology, relate in particular to a kind of high-frequency quenching thermal treatment process powder spare.
Background technology
Powder spare be a kind of with metal-powder through high temperature, high pressure compression moulding, carry out treatment process such as high-frequency quenching then and carry out the thermal treatment of hardness, toughness.Powder spare has advantages such as HS, high firmness, high-wearing feature, has replaced the metal parts of traditional technology at present gradually in fields such as for example automotive industrys, becomes the development trend of following metal parts.But for high frequency heat was handled, processing powder spare success ratio was quite low.Its major cause is and since powder spare be with tiny steel grit through press forming, though its density is little unlike general foundry goods, do not combine fully yet between the steel grit, this causes in the high-frequency quenching process, expanded by heating causes steel grit to separate and forms crackle.Through research; Find that powder spare is in high frequency technology; Be within 1.5 seconds, to be heated to 850-900 ℃ producing electric current through ruhmkorff coil through magnetic field under the normal temperature state. through quench cooled, produce internal stress and ftracture, it is by tiny firm grain that main cause is still powder spare; Through the HTHP extrusion moulding, tissue density is reached more than 7 grades through the continuous oven high temperature sintering; Though so but still gapped between the tissue, moment high temperature and cooling be prone to produce slight crack, so control is quite important on processing sequence.At present, when utilizing traditional technology that powder spare is carried out high-frequency quenching, how the probability that crackle occurs reduces the probability that it crackle occurs up to about 70%, and improving product percent of pass is present problem demanding prompt solution.
Summary of the invention
The invention provides a kind of solution of the above problems, provide a kind of passing rate of processing high powder spare thermal treatment process.
Technical scheme of the present invention provides powder spare thermal treatment process, and it is that a kind of powder spare that is directed against carries out the high frequency process of thermal treatment, and it is characterized in that: it may further comprise the steps:
1) preheating is carried out thermal pretreatment to powder spare;
2) air cooling, in air to powder spare naturally cooling 1 to 5 second;
3) heating is heated to 800～900 ℃ to powder spare, and kept 1～2 second;
4) air cooling, in air to powder spare naturally cooling 0.1 to 2 second;
5) cool off, powder spare is placed in the hardening liquid cooled off 3 to 5 seconds.
Preferably, in the said step 1), said powder spare is preheating to 300～500 ℃.
Preferably, in the said step 1), said powder spare is preheating to 350 ℃.
Preferably, in the said step 1), to said powder spare warm up time be 0.6 second.
Preferably, in the said step 3), utilize High-frequency machine that said powder spare is heated to 850 ℃.
Preferably, said step 2) in, in air to powder spare naturally cooling 2 seconds.
Powder spare thermal treatment process of the present invention is through testing the invaluable experience that obtains repeatedly; Through increasing the step of air cooling; Powder spare internal-external temperature difference has reduced the probability that crackle occurs in the heat-processed thereby reduce; Wherein the controlled temperature of each step, hold-time are all through experimental comparison repeatedly, to obtain best effect.Powder spare thermal treatment process of the present invention is based on the improvement on existing equipment and the technology basis, and it has simple, easy to operate, qualification rate advantages of higher.
Embodiment
Following specific embodiments of the invention is described in further detail.
Powder spare thermal treatment process of the present invention is a kind ofly to utilize High-frequency machine to be directed against powder spare to carry out the high frequency process of thermal treatment cooling (6 seconds) that traditional technology is: output power (S98)--heating (1.5 seconds)--.--preheating (0.6 second)--air cooling (0.5 second)--output power (S96)--formal heating (1.3 seconds)--cooling (4 seconds) that and technology of the present invention is: output power (S50).Specifically, comprising:
1) preheating, the output power reduction is carried out preheating action improvement earlier with 50% and is heated situation rapidly, in High-frequency machine, powder spare is carried out thermal pretreatment, makes it be heated to 300～500 ℃; Through comparing repeatedly, under other the same terms, in 300～500 ℃ of intervals, powder spare crackle occurrence probability is minimum when being preheating to 350 ℃;
2) air cooling, High-frequency machine stop heating, make to make the temperature difference of powder spare internal and external parts reduce by powder spare naturally cooling 1 to 5 second in air; It is to cause powder spare the basic reason of crackle in heat treatment process, to occur that there is the temperature difference in powder spare internal and external parts; Through experimental comparison, naturally cooling can reach effect preferably in 0.5 second, and too short-range missile caused the temperature difference and reduced not obviously cooling time, and cooling time is long, causes preheating temperature not enough, wastes energy; Air cooling expands to interior tissue by its temperature shortens inside and outside fall range.
3) heating utilizes High-frequency machine that powder spare is heated to 800～900 ℃, wherein preferred 850 ℃; Output power and time are because of the preheating action is arranged, so electric power is with S96,1.2 seconds heat-up times just satisfying the product requirement condition.
4) air cooling, High-frequency machine stop heating, make powder spare naturally cooling 0.1 to 2 second in air; Air cooling expands to interior tissue by its temperature shortens inside and outside fall range.
5) cooling is placed in the hardening liquid cooling 4 to 5 seconds with powder spare, and this be the step in the traditional technology, controls 4 seconds cooling time and made workpiece temperature (60-70) degree of also having a surplus, and forms a natural tempering and moves.
Through above process reform, the slight crack ratio is reduced, and gold also becomes more careful reaching evenly because of process reform makes tissue as organizing, and still can obtain high firmness and HS.
Above embodiment is merely the present invention's a kind of embodiment wherein, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with accompanying claims.
Claims (6)
1. powder spare thermal treatment process, it is a kind ofly to carry out the high frequency process of thermal treatment to powder spare, it is characterized in that: it may further comprise the steps:
1) preheating is carried out thermal pretreatment to powder spare;
2) air cooling, in air to powder spare naturally cooling 0.1 to 1 second;
3) heating is heated to 800～900 ℃ to powder spare, and kept 1～2 second;
4) air cooling, in air to powder spare naturally cooling 0.1 to 2 second;
5) cool off, powder spare is placed in the hardening liquid cooled off 3 to 5 seconds.
2. powder spare thermal treatment process according to claim 1 is characterized in that: in the said step 1), said powder spare is preheating to 300～500 ℃.
3. powder spare thermal treatment process according to claim 2 is characterized in that: in the said step 1), said powder spare is preheating to 350 ℃.
4. powder spare thermal treatment process according to claim 1 is characterized in that: in the said step 1), to said powder spare warm up time be 0.6 second.
5. powder spare thermal treatment process according to claim 1 is characterized in that: in the said step 3), utilize High-frequency machine that said powder spare is heated to 850 ℃.
6. powder spare thermal treatment process according to claim 1 is characterized in that: said step 2), in air to powder spare naturally cooling 0.5 second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210244975XA CN102732699A (en) | 2012-07-16 | 2012-07-16 | Heat treatment process for powder part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210244975XA CN102732699A (en) | 2012-07-16 | 2012-07-16 | Heat treatment process for powder part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102732699A true CN102732699A (en) | 2012-10-17 |
Family
ID=46988993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210244975XA Pending CN102732699A (en) | 2012-07-16 | 2012-07-16 | Heat treatment process for powder part |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102732699A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103408325A (en) * | 2013-07-04 | 2013-11-27 | 南通冠优达磁业有限公司 | Heat treatment process of ferrite magnetic parts |
| CN105390265A (en) * | 2015-12-03 | 2016-03-09 | 安徽大地熊新材料股份有限公司 | Method for improving performance of rare-earth-iron-boron permanent magnet material |
| CN113073180A (en) * | 2021-03-24 | 2021-07-06 | 鑫光热处理工业(昆山)有限公司 | Heat treatment processing technology for powder part |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101570819A (en) * | 2009-06-18 | 2009-11-04 | 柳州金茂机械有限公司 | Heating processing technology for wear-resistant cutting board |
| CN101857914A (en) * | 2010-05-24 | 2010-10-13 | 清华大学 | Heat treatment method for materials of 25CrMo alloy steel hollow car axle for high-speed railway passenger trains |
| CN102108436A (en) * | 2010-12-13 | 2011-06-29 | 清华大学 | Heat treatment method for alloy steel hollow car axle material for high-speed railway cars |
-
2012
- 2012-07-16 CN CN201210244975XA patent/CN102732699A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101570819A (en) * | 2009-06-18 | 2009-11-04 | 柳州金茂机械有限公司 | Heating processing technology for wear-resistant cutting board |
| CN101857914A (en) * | 2010-05-24 | 2010-10-13 | 清华大学 | Heat treatment method for materials of 25CrMo alloy steel hollow car axle for high-speed railway passenger trains |
| CN102108436A (en) * | 2010-12-13 | 2011-06-29 | 清华大学 | Heat treatment method for alloy steel hollow car axle material for high-speed railway cars |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103408325A (en) * | 2013-07-04 | 2013-11-27 | 南通冠优达磁业有限公司 | Heat treatment process of ferrite magnetic parts |
| CN105390265A (en) * | 2015-12-03 | 2016-03-09 | 安徽大地熊新材料股份有限公司 | Method for improving performance of rare-earth-iron-boron permanent magnet material |
| CN105390265B (en) * | 2015-12-03 | 2017-05-24 | 安徽大地熊新材料股份有限公司 | Method for improving performance of rare-earth-iron-boron permanent magnet material |
| CN113073180A (en) * | 2021-03-24 | 2021-07-06 | 鑫光热处理工业(昆山)有限公司 | Heat treatment processing technology for powder part |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103421940B (en) | A kind ofly a thermal cycling is utilized to carry out modified processing method to AISI4140 and AISI4340 structure iron forging | |
| CN101818234B (en) | Quenching process of H13 steel for compression molds | |
| CN104532154A (en) | High-hardness high-polishing pre-hardening plastic die steel and manufacture technology thereof | |
| CN108559934B (en) | Cryogenic treatment process for TC6 titanium alloy forging | |
| CN100584963C (en) | Austenitic stainless steel as-forged solid solution treatment process after forging | |
| CN108441613B (en) | A kind of anti-white point control method of age-hardening plastic mould steel | |
| CN103602797A (en) | High-hardness steel cut wire shot heat treatment technology | |
| CN102732699A (en) | Heat treatment process for powder part | |
| CN108193023B (en) | Method for eliminating network carbide in annealing microstructure of H13 die steel | |
| CN105220066B (en) | Nanometer pearlite steel and preparation method thereof | |
| CN104109800B (en) | High intensity is containing vanadium height manganese nonmagnetic steel and production method thereof | |
| CN108796181A (en) | One discharge plate member is heat-treated annealing process | |
| CN103993141A (en) | Spheroidizing annealing process for high-toughness medium carbon steel wires | |
| CN104099456A (en) | Forging and heat treatment method of 9Cr18MoV steel forging | |
| JP2013082992A (en) | Method for producing steel material excellent in toughness for die | |
| CN102337453A (en) | Method for improving plastic deformation resistance of low-carbon structural steel | |
| RU2631548C1 (en) | Method for producing tungsten carbide-based hard alloy products | |
| CN106048483B (en) | A kind of method of improvement CuNiMnFe alloy plasticity and toughness | |
| CN102691110A (en) | Annealing process for ingot furnace | |
| CN108145166A (en) | Powder part heat treatment process | |
| CN103849736A (en) | Heat treatment process of high-chromium cast iron | |
| CN104109811A (en) | Mn-Cr-V ultra-high strength non-magnetic steel and production method thereof | |
| CN108127120A (en) | A kind of powder part heat treatment process | |
| CN106735243A (en) | Powder part Technology for Heating Processing | |
| CN102517498A (en) | IF steel containing niobium and titanium for advanced automobile and annealing process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20121017 |