CN105710375A - Heat treatment process for powder piece - Google Patents
Heat treatment process for powder piece Download PDFInfo
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- CN105710375A CN105710375A CN201410739841.4A CN201410739841A CN105710375A CN 105710375 A CN105710375 A CN 105710375A CN 201410739841 A CN201410739841 A CN 201410739841A CN 105710375 A CN105710375 A CN 105710375A
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Abstract
The invention discloses a heat treatment process for a powder piece, in particular to the high-frequency heat treatment process for the powder piece. The heat treatment process comprises the following steps that 1, preheating is conducted, specifically, the powder piece is subjected to preheating treatment; 2, air cooling is conducted, specifically, the powder piece is naturally cooled for 0.1-1 second in the air; 3, heating is conducted, specifically, the powder piece is heated to 800 DEG C-900 DEG C; 4, air cooling is conducted, specifically, the powder piece is naturally cooled for 0.1-2 seconds in the air; and 5, cooling is conducted, specifically, the powder piece is put into quenching liquid and cooled for 3-5 seconds. According to the heat treatment process for the powder piece, valuable experience is obtained through repeated tests, the time of the air cooling steps is increased, and the temperature difference between the inside and the outside of the powder piece in the heating process is decreased, so that the probability of occurrence of cracks is decreased; the control temperature and the holding time of each step are tested and compared repeatedly to obtain the best effect; and the heat treatment process for the powder piece is improved on the basis of existing equipment and process and has the advantages of being simple, easy to operate, high in qualified rate and the like.
Description
Technical field
The present invention relates to a kind of metal heating processing technology, particularly relate to a kind of high-frequency quenching Technology for Heating Processing to powder part.
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. science and engineering skill and carries out the heat treatment of hardness, toughness.Powder part has the advantages such as high intensity, high rigidity, high-wearing feature, replaces the metal parts of traditional handicraft at present gradually in fields such as auto industrys, becomes the development trend of following metal parts.But for processing for high frequency heat, processing powder part success rate is at a fairly low.Its main cause is, owing to powder part is with tiny steel grit by compressing, although its density is little unlike general foundry goods, but is fully integrated together not yet between steel grit, and this causes in high-frequency quenching process, expanded by heating, causes steel grit to separate and forms crackle.By studying, find that powder part is in high frequency technique, it is that sensed coil is heated to 850-900 DEG C within 1.5 seconds by field generating current under room temperature state. in quenched cooling, produce internal stress and ftracture, it is by tiny firm grain that main cause is still powder part, through High Temperature High Pressure extrusion molding, tissue density is made to reach more than 7 grades by continuous oven high temperature sintering；Though so still have gap between tissue, be easily generated slight crack at instantaneous high-temperature and cooling, so controlling fairly heavy wanting in process.At present, when utilizing traditional handicraft that powder part is carried out high-frequency quenching, the probability of crackle occur up to about 70%, how to reduce its probability crackle occur, improving conforming product rate is current problem demanding prompt solution.
Summary of the invention
The invention provides a kind of scheme solving the problems referred to above, it is provided that the powder part Technology for Heating Processing that a kind of passing rate of processing is high.
The technical scheme is that offer powder part Technology for Heating Processing, it is that one carries out high frequency process of thermal treatment for powder part, and it comprises the following steps:
1) preheating, carries out the pre-heat treatment to powder part；
2) air cooling, in atmosphere to powder part natural cooling 1 to 5 second；
3) heating, is heated powder part to 800～900 DEG C, and keeps 1～2 second；
4) air cooling, in atmosphere to powder part natural cooling 0.1 to 2 second；
5) cooling, is placed in powder part in quenching liquid and cools down 3 to 5 seconds.
Preferably, described step 1) in, described powder part is preheating to 300～500 DEG C.
Preferably, described step 1) in, described powder part is preheating to 350 DEG C.
Preferably, described step 1) in, it is 0.6 second to described powder part preheating time.
Preferably, described step 3) in, utilize High-frequency machine to heat described powder part to 850 DEG C.
Preferably, described step 2) in, in atmosphere to powder part natural cooling 2 seconds.
The powder part Technology for Heating Processing of the present invention is the invaluable experience through repeatedly testing acquisition, by increasing the step of air cooling, reduce powder part internal-external temperature difference in heating process thus reducing the probability that crackle occurs, wherein the control temperature of each step, retention time both pass through experimental comparison repeatedly, to obtain optimum efficiency.The powder part Technology for Heating Processing of the present invention is based on the improvement on existing equipment and Process ba-sis, and it has operation simple, easy, qualification rate advantages of higher.
Detailed description of the invention
Below the specific embodiment of the present invention is described in further detail.
--heating (1.5 seconds)--cooling (6 seconds) that the powder part Technology for Heating Processing of the present invention is that one utilizes High-frequency machine to carry out high frequency process of thermal treatment for powder part to be: output power (S98).--preheating (0.6 second)--air cooling (0.5 second)--output power (S96)--formal heating (1.3 seconds)--cooling (4 seconds) and the technique of the present invention is: output power (S50).Specifically, including:
1) preheating, output power reduction first carries out preheating action with 50% and improves instant heating situation, in High-frequency machine, powder part is carried out the pre-heat treatment so that it is be heated to 300～500 DEG C；Through repeatedly comparing, under other the same terms, in 300～500 DEG C of intervals, when being preheating to 350 DEG C, powder part crackle occurrence probability is minimum；
2) air cooling, High-frequency machine stops heating so that powder part is natural cooling 1 to 5 second in atmosphere so that the temperature difference of powder part internal and external parts reduces；It is the basic reason causing powder part to occur crackle in heat treatment process that powder part internal and external parts exists the temperature difference；Through experimental comparison, natural cooling can reach good effect in 0.5 second, and too short-range missile caused the temperature difference and reduced inconspicuous cool time, and cool time is long, causes that preheating temperature is inadequate, wastes the energy；Air cooling makes inside and outside fall range shorten by the expansion of its temperature to interior tissue.
3) heating, utilizes High-frequency machine powder part to be heated to 800～900 DEG C, wherein preferably 850 DEG C；Output power and time are because there being preheating action, therefore electric power S96,1.2 seconds heat time heating times just can meet product requirement condition.
4) air cooling, High-frequency machine stops heating so that powder part is natural cooling 0.1 to 2 second in atmosphere；Air cooling makes inside and outside fall range shorten by the expansion of its temperature to interior tissue.
5) cooling, is placed in powder part in quenching liquid and cools down 4 to 5 seconds, and this be the step in traditional handicraft, controls cool time 4 seconds to make workpiece temperature (60-70) of also having a surplus to spend, forms a natural tempering action.
Changed by process above, make slight crack ratio reduce, and gold as tissue, also because of process reform, to make tissue become 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 carries out high frequency process of thermal treatment for powder part, it is characterised in that it comprises the following steps:
1) preheating, carries out the pre-heat treatment to powder part；
2) air cooling, in atmosphere to powder part natural cooling 0.1 to 1 second；
3) heating, is heated powder part to 800～900 DEG C, and keeps 1～2 second；
4) air cooling, in atmosphere to powder part natural cooling 0.1 to 2 second；
5) cooling, is placed in powder part in quenching liquid and cools down 3 to 5 seconds.
2. powder part Technology for Heating Processing according to claim 1, it is characterised in that described step 1) in, described powder part is preheating to 300～500 DEG C.
3. powder part Technology for Heating Processing according to claim 2, it is characterised in that described step 1) in, described powder part is preheating to 350 DEG C.
4. powder part Technology for Heating Processing according to claim 1, it is characterised in that described step 1) in, it is 0.6 second to described powder part preheating time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410739841.4A CN105710375A (en) | 2014-12-05 | 2014-12-05 | Heat treatment process for powder piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410739841.4A CN105710375A (en) | 2014-12-05 | 2014-12-05 | Heat treatment process for powder piece |
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| Publication Number | Publication Date |
|---|---|
| CN105710375A true CN105710375A (en) | 2016-06-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201410739841.4A Pending CN105710375A (en) | 2014-12-05 | 2014-12-05 | Heat treatment process for powder piece |
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| CN (1) | CN105710375A (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 |
-
2014
- 2014-12-05 CN CN201410739841.4A patent/CN105710375A/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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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160629 |
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| WD01 | Invention patent application deemed withdrawn after publication |