CN106735243A - Powder part Technology for Heating Processing - Google Patents
Powder part Technology for Heating Processing Download PDFInfo
- Publication number
- CN106735243A CN106735243A CN201510830225.4A CN201510830225A CN106735243A CN 106735243 A CN106735243 A CN 106735243A CN 201510830225 A CN201510830225 A CN 201510830225A CN 106735243 A CN106735243 A CN 106735243A
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- CN
- China
- Prior art keywords
- powder part
- heating processing
- powder
- air cooling
- technology
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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 Technology for Heating Processing, it is that one kind carries out high frequency process of thermal treatment for powder part, and it is comprised the following steps：1) preheat, the pre-heat treatment is carried out to powder part；2) air cooling, in atmosphere to powder part natural cooling 0.1 to 1 second；3) heat, powder part is carried out to be heated to 800~900 DEG C；4) air cooling, in atmosphere to powder part natural cooling 0.1 to 2 second；5) cool 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, the step of by increasing air cooling, reduce heating process in powder part internal-external temperature difference so as to reduce crackle appearance probability, the wherein control temperature of each step, the retention time by experimental comparison repeatedly, to obtain optimum efficiency.Powder part Technology for Heating Processing of the invention is that it has the advantages that simple, easy to operate, qualification rate is high based on the improvement in existing equipment and Process ba- sis.
Description
Technical field
At a kind of metal heating processing technology, more particularly to a kind of high-frequency quenching heat to powder part
Science and engineering skill.
Background technology
Powder part is a kind of that metal dust is compressing by high temperature, high pressure, then carries out high-frequency quenching etc.
Handling process carries out the heat treatment of hardness, toughness.Powder part has high intensity, high rigidity, high-wearing feature etc.
Advantage, gradually replaces the metal parts of traditional handicraft in fields such as auto industrys at present, as following gold
Belong to the development trend of part.But for high frequency heat treatment, processing powder part success rate is at a fairly low.Its
Main cause is, because powder part is by compressing with tiny steel grit, although its density is unlike general casting
Part is small, but is not fully integrated together yet between steel grit, and this causes during high-frequency quenching, is heated swollen
It is swollen, cause steel grit to separate to form crackle.By research, it is found that powder part is in normal temperature in high frequency technique
Sensed coil was heated to 850-900 DEG C of within 1.5 seconds and exists by field generating current under state
Quenched cooling, produces internal stress and ftractures, and main cause is still that powder part is by tiny firm grain, through HTHP
Extrusion molding, tissue density up to more than 7 grades is made by continuous oven high temperature sintering；Though between such but tissue still
There is gap, slight crack is also easy to produce in instantaneous high-temperature and cooling, so being controlled in process quite important.Mesh
Before, when carrying out high-frequency quenching to powder part using traditional handicraft, the probability for crackle occur is up to 70% or so,
How to reduce it and the probability of crackle occur, it is current problem demanding prompt solution to improve product percent of pass.
The content of the invention
The invention provides a kind of scheme for solving the above problems, there is provided a kind of passing rate of processing powder part high
Technology for Heating Processing.
The technical scheme is that providing powder part Technology for Heating Processing, it is that one kind carries out height for powder part
Frequency process of thermal treatment, it is comprised the following steps：
1) preheat, the pre-heat treatment is carried out to powder part；
2) air cooling, in atmosphere to powder part natural cooling 1 to 5 second；
3) heat, powder part is carried out to be heated to 800~900 DEG C, and kept for 1~2 second；
4) air cooling, in atmosphere to powder part natural cooling 0.1 to 2 second；
5) cool down, powder part is placed in quenching liquid and is cooled down 3 to 5 seconds.
Preferably, the step 1) in, 300~500 DEG C are preheating to the powder part.
Preferably, the step 1) in, 350 DEG C are preheating to the powder part.
Preferably, the step 1) in, it is 0.6 second to the powder part preheating time.
Preferably, the step 3) in, 850 DEG C are heated to the powder part using High-frequency machine.
Preferably, the step 2) in, in atmosphere to powder part natural cooling 2 seconds.
Powder part Technology for Heating Processing of the invention is the invaluable experience by testing acquisition repeatedly, empty by increasing
Cold step, reduce heating process in powder part internal-external temperature difference so as to reduce crackle appearance probability, wherein
Control temperature, the retention time of each step by experimental comparison repeatedly, to obtain optimum efficiency.This hair
Bright powder part Technology for Heating Processing be based on the improvement in existing equipment and Process ba- sis, its have simply,
It is easy to operate, the advantages of qualification rate is high.
Specific embodiment
Specific embodiment of the invention is described in further detail below.
Powder part Technology for Heating Processing of the invention, is that one kind is carried out at high frequency heat using High-frequency machine for powder part
The technique of reason is：Output power (S98) -- heating (1.5 seconds) -- cooling (6 seconds).And it is of the invention
Technique is：Output power (S50) -- preheating (0.6 second) -- air cooling (0.5 second) -- output power
(S96) -- formal heating (1.3 seconds) -- cooling (4 seconds).Specifically, including：
1) preheat, output power reduction first carries out preheating action with 50% improves instant heating situation, in height
The pre-heat treatment is carried out to powder part in frequency machine, it is heated to 300~500 DEG C；By comparing repeatedly, its
Under his the same terms, in 300~500 DEG C of intervals, powder part crackle occurrence probability when being preheating to 350 DEG C
It is minimum；
2) air cooling, High-frequency machine stops heating so that powder part natural cooling 1 to 5 second in atmosphere,
So that the temperature difference of powder part internal and external parts reduces；It is to cause powder part to exist that powder part internal and external parts has the temperature difference
Occurs the basic reason of crackle in heat treatment process；By experimental comparison, natural cooling 0.5 second is i.e. reachable
To preferable effect, it is unobvious that cool time too short-range missile causes the temperature difference to reduce, and cool time is long, causes preheating
Temperature not enough, wastes the energy；Air cooling expands to interior tissue by its temperature shortens inside and outside fall range.
3) heat, powder part is carried out using High-frequency machine be heated to 800~900 DEG C, wherein it is preferred that 850 DEG C；
Output power and time are because there is preheating to act, therefore electric power S96,1.2 seconds heat times can meet product
Requirement condition.
4) air cooling, High-frequency machine stops heating so that powder part natural cooling 0.1 to 2 in atmosphere
Second；Air cooling expands to interior tissue by its temperature shortens inside and outside fall range.
5) cool down, powder part is placed in quenching liquid and is cooled down 4 to 5 seconds, this is the step in traditional handicraft
Suddenly, cool time control make within 4 seconds workpiece also have a surplus warm (60-70) spend, form 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 becomes tissue
For more careful and uniform, and still can obtain high rigidity and high intensity.
Claims (4)
1. powder part Technology for Heating Processing, it is that one kind carries out high frequency process of thermal treatment for powder part, and its feature exists
In it is comprised the following steps：
1) preheat, the pre-heat treatment is carried out to powder part；
2) air cooling, in atmosphere to powder part natural cooling 0.1 to 1 second；
3) heat, powder part is carried out to be heated to 800~900 DEG C, and kept for 1~2 second；
4) air cooling, in atmosphere to powder part natural cooling 0.1 to 2 second；
5) cool down, powder part is placed in quenching liquid and is cooled down 3 to 5 seconds.
2. powder part Technology for Heating Processing according to claim 1, it is characterised in that the step 1) in,
300~500 DEG C are preheating to the powder part.
3. powder part Technology for Heating Processing according to claim 2, it is characterised in that the step 1) in,
350 DEG C are preheating to the powder part.
4. powder part Technology for Heating Processing according to claim 1, it is characterised in that the step 1) in,
It it is 0.6 second to the powder part preheating time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510830225.4A CN106735243A (en) | 2015-11-25 | 2015-11-25 | Powder part Technology for Heating Processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510830225.4A CN106735243A (en) | 2015-11-25 | 2015-11-25 | Powder part Technology for Heating Processing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106735243A true CN106735243A (en) | 2017-05-31 |
Family
ID=58963812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510830225.4A Pending CN106735243A (en) | 2015-11-25 | 2015-11-25 | Powder part Technology for Heating Processing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106735243A (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 |
-
2015
- 2015-11-25 CN CN201510830225.4A patent/CN106735243A/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: 20170531 |
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| WD01 | Invention patent application deemed withdrawn after publication |