CN108145166A - Powder part heat treatment process - Google Patents
Powder part heat treatment process Download PDFInfo
- Publication number
- CN108145166A CN108145166A CN201611105051.6A CN201611105051A CN108145166A CN 108145166 A CN108145166 A CN 108145166A CN 201611105051 A CN201611105051 A CN 201611105051A CN 108145166 A CN108145166 A CN 108145166A
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- CN
- China
- Prior art keywords
- powder part
- heat treatment
- air
- powder
- treatment process
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Articles (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses powder part heat treatment process, are a kind of for powder part progress high frequency process of thermal treatment, include the following steps：1) it preheats, the pre-heat treatment is carried out to powder part；2) air cooling, in air to powder part natural cooling 0.1 to 1 second；3) it heats, powder part is carried out to be heated to 800~900 DEG C；4) air cooling, in air to powder part natural cooling 0.1 to 2 second；5) it cools down, powder part is placed in quenching liquid and is cooled down 3 to 5 seconds.The present invention is the invaluable experience by testing acquisition repeatedly, by increasing air-cooled step, powder part internal-external temperature difference is so as to reduce the probability of crackle appearance in reduction heating process, wherein the control temperature of each step, retention time pass through experimental comparison repeatedly, to obtain optimum efficiency.The powder part heat treatment process of the present invention is based on the improvement on existing equipment and Process ba- sis, has many advantages, such as that simple, easy to operate, qualification rate is high.
Description
Technical field
The present invention relates to a kind of metal heating processing technologies more particularly to a kind of high-frequency quenching to powder part to be heat-treated work
Skill.
Background technology
Powder part be it is a kind of by metal powder by high temperature, high pressure compression moulding, then carry out high-frequency quenching etc. science and engineering
Skill carries out the heat treatment of hardness, toughness.Powder part has many advantages, such as high intensity, high rigidity, high-wearing feature, gradually exists at present
The fields such as auto industry replace the metal parts of traditional handicraft, become the development trend of following metal parts.But for high frequency
For heat treatment, processing powder part success rate is at a fairly low.The main reason is that since powder part is to pass through compacting with tiny steel grit
Forming, although its density is small unlike general casting, is not fully integrated together, this causes in high-frequency quenching yet between steel grit
In the process, expanded by heating causes steel grit to detach to form crackle.By research, it is found that powder part is in room temperature in high frequency technique
Sensed coil was heated to 850-900 DEG C of in quenched cooling, production by field generating current within 1.5 seconds under state
It gives birth to internal stress and cracks, it is by tiny firm grain that main cause, which is still powder part, through high temperature and pressure extrusion molding, is burnt by continuous oven high temperature
Knot makes tissue density up to 7 grades or more；Though so but between organizing still having gap, slight crack is also easy to produce in instantaneous high-temperature and cooling, institute
It is quite important to be controlled in process.At present, it is cracked when carrying out high-frequency quenching to powder part using traditional handicraft
Probability is up to 70% or so, how to reduce its cracked probability, and it is current urgent problem to be solved to improve product qualification rate.
Invention content
The present invention provides a kind of schemes to solve the above problems, provide a kind of passing rate of processing high powder part heat treatment
Technique.
It is that a kind of powder part that is directed to is carried out at high frequency heat the technical scheme is that providing powder part heat treatment process
The technique of reason, includes the following steps：
1) it preheats, the pre-heat treatment is carried out to powder part；
2) air cooling, in air to powder part natural cooling 1 to 5 second；
3) it heats, powder part is carried out to be heated to 800~900 DEG C, and kept for 1~2 second；
4) air cooling, in air to powder part natural cooling 0.1 to 2 second；
5) it cools down, powder part is placed in quenching liquid and is cooled down 3 to 5 seconds.
Preferably, in the step 1), 300~500 DEG C are preheating to the powder part.
Preferably, in the step 1), 350 DEG C are preheating to the powder part.
Preferably, it is 0.6 second to the powder part preheating time in the step 1).
Preferably, in the step 3), 850 DEG C are heated to the powder part using High-frequency machine.
Preferably, in the step 2), in air to powder part natural cooling 2 seconds.
The powder part heat treatment process of the present invention is the invaluable experience by testing acquisition repeatedly, by increasing air-cooled step
Suddenly, powder part internal-external temperature difference is so as to reduce the probability of crackle appearance in reduction heating process, wherein the control temperature of each step
Degree, retention time all pass through experimental comparison repeatedly, to obtain optimum efficiency.The powder part heat treatment process of the present invention is based on existing
Improvement in some equipment and Process ba- sis has many advantages, such as that simple, easy to operate, qualification rate is high.
Specific embodiment
The specific embodiment of the present invention is described in further detail below.
The powder part heat treatment process of the present invention is a kind of work for carrying out high frequency heat treatment for powder part using High-frequency machine
Skill is：Output power (S98) -- heating (1.5 seconds) -- cooling (6 seconds).And the technique of the present invention is：Output power (S50) -- it is pre-
Hot (0.6 second) -- air-cooled (0.5 second) -- output power (S96) -- formal heating (1.3 seconds) -- cooling (4 seconds).Specifically, it wraps
It includes：
1) it preheats, output power is reduced first carries out preheating action improvement instant heating situation with 50%, right in High-frequency machine
Powder part carries out the pre-heat treatment, it is made to be heated to 300~500 DEG C；By comparing repeatedly, under the conditions of other same, 300~
In 500 DEG C of sections, powder part crackle occurrence probability is minimum when being preheating to 350 DEG C；
2) air cooling, High-frequency machine stop heating so that powder part natural cooling 1 to 5 second in air so that powder part
The temperature difference of internal and external parts reduces；There are the temperature difference to cause powder part cracked in heat treatment process for powder part internal and external parts
Basic reason；By experimental comparison, natural cooling can reach preferable effect for 0.5 second, and cooling time, too short-range missile caused the temperature difference to subtract
Small unobvious, cooling time is long, causes preheating temperature inadequate, waste of energy；It is air-cooled to allow in its temperature expands to interior tissue and make
Outer fall range shortens.
3) it heats, powder part is carried out using High-frequency machine to be heated to 800~900 DEG C, wherein it is preferred that 850 DEG C；Output power
And the time, because there is preheating action, therefore electric power S96,1.2 seconds heating times can meet product requirement condition.
4) air cooling, High-frequency machine stop heating so that powder part natural cooling 0.1 to 2 second in air；It is air-cooled to allow it
Temperature, which expands to interior tissue, shortens inside and outside fall range.
5) cool down, powder part is placed in quenching liquid and cool down 4 to 5 seconds, this be traditional handicraft in step, cooling time
Control makes workpiece also have residual temperature (60-70) degree for 4 seconds, forms a natural tempering action.
Changed by process above, make the reduction of slight crack ratio, and gold is as tissue is also because process reform makes tissue become thinner
It causes and uniform, and still can obtain high rigidity and high intensity.
Claims (4)
1. powder part heat treatment process is a kind of for powder part progress high frequency process of thermal treatment, which is characterized in that it is wrapped
Include following steps：
1) it preheats, the pre-heat treatment is carried out to powder part；
2) air cooling, in air to powder part natural cooling 0.1 to 1 second；
3) it heats, powder part is carried out to be heated to 800~900 DEG C, and kept for 1~2 second；
4) air cooling, in air to powder part natural cooling 0.1 to 2 second；
5) it cools down, powder part is placed in quenching liquid and is cooled down 3 to 5 seconds.
2. powder part heat treatment process according to claim 1, which is characterized in that in the step 1), to the powder
Part is preheating to 300~500 DEG C.
3. powder part heat treatment process according to claim 2, which is characterized in that in the step 1), to the powder
Part is preheating to 350 DEG C.
4. powder part heat treatment process according to claim 1, which is characterized in that in the step 1), to the powder
Part preheating time is 0.6 second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611105051.6A CN108145166A (en) | 2016-12-05 | 2016-12-05 | Powder part heat treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611105051.6A CN108145166A (en) | 2016-12-05 | 2016-12-05 | Powder part heat treatment process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108145166A true CN108145166A (en) | 2018-06-12 |
Family
ID=62470954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611105051.6A Pending CN108145166A (en) | 2016-12-05 | 2016-12-05 | Powder part heat treatment process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108145166A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2016
- 2016-12-05 CN CN201611105051.6A patent/CN108145166A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180612 |
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| WD01 | Invention patent application deemed withdrawn after publication |