CN102260844A - Surface processing method for coal mining mechanical parts - Google Patents
Surface processing method for coal mining mechanical parts Download PDFInfo
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- CN102260844A CN102260844A CN2011102036432A CN201110203643A CN102260844A CN 102260844 A CN102260844 A CN 102260844A CN 2011102036432 A CN2011102036432 A CN 2011102036432A CN 201110203643 A CN201110203643 A CN 201110203643A CN 102260844 A CN102260844 A CN 102260844A
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Abstract
The invention belongs to the technology of metal surface processing and relates to a surface processing method for coal mining mechanical parts, in particular to a surface processing method for coal mining mechanical parts. The technical problem to be solved is to provide a surface processing method for large coal mining mechanical parts, which can improve hardness, is corrosion-resistant and low in cost and is harmless to environment. In the technical scheme, treated workpieces are subjected to first-step preheating, second-step nitriding, third-step oxidation and forth-step cooling to obtain workpieces processed by salt bath. The corrosion resistance of the surfaces of the processed workpieces is over 5 times higher than that of chromium plating and nickel plating, is over 10 times higher than that of zinc plating and is over 20 times that of bluing, and the surface hardness is over 50 rockwell hardness (HRC) and is far higher than that of the chromium plating, the nickel plating and the bluing. Simultaneously, the surface processing method is low in cost and harmless to environment, and can be widely used for the surface processing of the coal mining mechanical parts with large volume.
Description
Technical field
Coal mine machinery piece surface treatment process of the present invention belongs to metal surface treatment technology, particularly a kind of coal mine machinery piece surface treatment process that is used for.
Background technology
Coal mine machinery is because environment for use is abominable, reliability requirement is high, so require equipment part wear-resistant, anticorrosive, the main now methods such as chromium plating or nickel plating method, the processing of turning blue that adopt, surface hardness is lower, erosion resistance is relatively poor, the more high shortcoming of cost but aforesaid method exists.Domestic common salt bath composite treatment technology is primarily aimed at less workpiece surface and handles, as the surface treatment of machine tool, because salt bath formula if nitriding temperature is too low, can not form the infiltration layer of enough degree of depth; And nitriding temperature is too high, and the surface porosity layer is serious, and temperature surpasses the hardness that tempering temperature then can reduce matrix, and the prussiate in traditional nitridation salt has severe toxicity simultaneously, and environment is had bigger harm.
Summary of the invention
The present invention has the deficiency of technology in order to overcome oneself, provides a kind of and can improve hardness, corrosion-resistant, low-cost, and environmental sound is used for the method than big coal mine machinery piece surface processing simultaneously.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is for to carry out according to following steps:
The first step, preheating
Processed workpiece is put into external-heat crucible electric furnace, keep 510 ℃ of temperature, 25 minutes time;
Second step, nitrogenize
Processed workpiece is put into the external-heat crucible electric furnace that liquid nitriding salt is housed, in the liquid after the fusion of immersion nitridation salt, keep 570 ℃ of temperature, 2.5 hours time;
The 3rd step, oxidation
Processed workpiece is put into the external-heat crucible electric furnace that liquid oxidatively salt is housed, in the liquid after the fusion of immersion saline oxide, keep 420 ℃ of temperature, 70 minutes time;
The 4th step, cooling
Processed workpiece is taken out in the crucible electric furnace, naturally cool to room temperature in the air, obtain salt bath and handle workpiece;
The raw material of described nitridation salt is prepared by following weight part: 50 parts in urea, 20 parts in salt of wormwood, 10 parts in yellow soda ash, 10 parts in Repone K, 10 parts in potassium hydroxide;
The raw material of described saline oxide is prepared by following weight part: 20 parts of Sodium Nitrites, 15 parts of SODIUMNITRATE, 15 parts in saltpetre, 50 parts in sodium hydroxide.
Salt bath handles that workpiece desalts through cleaning successively, dry, immersion oil is handled and obtained the finished product workpiece.
The present invention compared with prior art has following beneficial effect.
The workpiece surface solidity to corrosion that adopts invention to handle improves more than 5 times than chromium plating and nickel plating, higher more than 10 times than zinc-plated, handle high more than 20 times than turning blue, surface hardness reaches more than the 50HRC, far above chromium plating and nickel plating and the treat surface hardness of turning blue, simultaneously, this surface-treated method cost is lower, environmental sound can be widely used in comparatively large vol coal mine machinery piece surface and handle simultaneously.
Embodiment
Coal mine machinery piece surface treatment process, carry out according to following steps:
The first step, preheating
Processed workpiece is put into external-heat crucible electric furnace, keep 510 ℃ of temperature, 25 minutes time;
Second step, nitrogenize
Processed workpiece is put into the external-heat crucible electric furnace that liquid nitriding salt is housed, in the liquid after the fusion of immersion nitridation salt, keep 570 ℃ of temperature, 2.5 hours time;
The 3rd step, oxidation
Processed workpiece is put into the external-heat crucible electric furnace that liquid oxidatively salt is housed, in the liquid after the fusion of immersion saline oxide, keep 420 ℃ of temperature, 70 minutes time;
The 4th step, cooling
Processed workpiece is taken out in the crucible electric furnace, naturally cool to room temperature in the air, obtain salt bath and handle workpiece;
The raw material of described nitridation salt is prepared by following weight part: 50 parts in urea, 20 parts in salt of wormwood, 10 parts in yellow soda ash, 10 parts in Repone K, 10 parts in potassium hydroxide;
The raw material of described saline oxide is prepared by following weight part: 20 parts of Sodium Nitrites, 15 parts of SODIUMNITRATE, 15 parts in saltpetre, 50 parts in sodium hydroxide.
Salt bath handles that workpiece desalts through cleaning successively, dry, immersion oil is handled and obtained the finished product workpiece.
Wherein clean desalt, drying and immersion oil processing step be prior art.
Embodiment 1
The first step: the colliery gear part is carried out preheating
The colliery gear part is put into external-heat crucible electric furnace, keep 510 ℃ of temperature, 25 minutes time in the crucible.
Second step: the colliery gear part is carried out nitriding treatment
With 50 parts in urea, 20 parts in salt of wormwood, 10 parts in yellow soda ash, 10 parts in Repone K, potassium hydroxide is put into external-heat crucible electric furnace for 10 parts, and regulating furnace temperature is 570 ℃, makes it fusion.The colliery gear part is taken out in external-heat crucible electric furnace, put into the external-heat crucible electric furnace that liquid nitriding salt is housed, in the nitridation salt liquid after the immersion fusion, keep 570 ℃ of the interior temperature of crucible, 2.5 hours immersion time.
The 3rd step: the colliery gear part is carried out oxide treatment
With 20 parts of Sodium Nitrites, 15 parts of SODIUMNITRATE, 15 parts in saltpetre, sodium hydroxide is put into external-heat crucible electric furnace for 50 parts, and regulating furnace temperature is 420 ℃, makes it fusion.The colliery gear part is taken out in the external-heat crucible electric furnace that liquid nitriding salt is housed, put into the external-heat crucible electric furnace that liquid oxidatively salt is housed, immerse in the saline oxide liquid, keep 420 ℃ of the interior temperature of crucible, 70 minutes immersion time.
The 4th step: the colliery gear part is cooled off
The colliery gear part is taken out in the crucible electric furnace of the saline oxide of packing into, be placed in the air, naturally cool to room temperature, obtain salt bath and handle workpiece.
At last salt bath is handled that workpiece desalts through cleaning, dry, immersion oil is handled and obtained finished product colliery gear part.
Embodiment 2
The first step: hydraulic pressure of the colliery pillar and cylinder sleeve are carried out preheating
Hydraulic pressure of the colliery pillar and cylinder sleeve are put into external-heat crucible electric furnace, keep 510 ℃ of temperature, 25 minutes time in the crucible.
Second step: hydraulic pressure of the colliery pillar and cylinder sleeve are carried out nitriding treatment
With 50 parts in urea, 20 parts in salt of wormwood, 10 parts in yellow soda ash, 10 parts in Repone K, potassium hydroxide is put into external-heat crucible electric furnace for 10 parts, and regulating furnace temperature is 570 ℃, makes it fusion.Hydraulic pressure of the colliery pillar and cylinder sleeve are taken out in external-heat crucible electric furnace, put into the external-heat crucible electric furnace that liquid nitriding salt is housed, in the nitridation salt liquid after the immersion fusion, keep 570 ℃ of the interior temperature of crucible, 2.5 hours immersion time.
The 3rd step: hydraulic pressure of the colliery pillar and cylinder sleeve are carried out oxide treatment
With 20 parts of Sodium Nitrites, 15 parts of SODIUMNITRATE, 15 parts in saltpetre, sodium hydroxide is put into external-heat crucible electric furnace for 50 parts, and regulating furnace temperature is 420 ℃, makes it fusion.Hydraulic pressure of the colliery pillar and cylinder sleeve are taken out in the external-heat crucible electric furnace that liquid nitriding salt is housed, put into the external-heat crucible electric furnace that liquid oxidatively salt is housed, immerse in the saline oxide liquid, keep 420 ℃ of the interior temperature of crucible, 70 minutes immersion time.
The 4th step: hydraulic pressure of the colliery pillar and cylinder sleeve are cooled off
Hydraulic pressure of the colliery pillar and cylinder sleeve are taken out in the crucible electric furnace of the saline oxide of packing into, be placed in the air, naturally cool to room temperature, obtain salt bath and handle workpiece.
At last salt bath is handled that workpiece desalts through cleaning, dry, immersion oil is handled and obtained finished product colliery hydraulic prop and cylinder sleeve.
Claims (2)
1. coal mine machinery piece surface treatment process is characterized in that carrying out according to following steps:
The first step, preheating
Processed workpiece is put into external-heat crucible electric furnace, keep 510 ℃ of temperature, 25 minutes time;
Second step, nitrogenize
Processed workpiece is put into the external-heat crucible electric furnace that liquid nitriding salt is housed, in the liquid after the fusion of immersion nitridation salt, keep 570 ℃ of temperature, 2.5 hours time;
The 3rd step, oxidation
Processed workpiece is put into the external-heat crucible electric furnace that liquid oxidatively salt is housed, in the liquid after the fusion of immersion saline oxide, keep 420 ℃ of temperature, 70 minutes time;
The 4th step, cooling
Processed workpiece is taken out in the crucible electric furnace, naturally cool to room temperature in the air, obtain salt bath and handle workpiece;
The raw material of described nitridation salt is prepared by following weight part: 50 parts in urea, 20 parts in salt of wormwood, 10 parts in yellow soda ash, 10 parts in Repone K, 10 parts in potassium hydroxide;
The raw material of described saline oxide is prepared by following weight part: 20 parts of Sodium Nitrites, 15 parts of SODIUMNITRATE, 15 parts in saltpetre, 50 parts in sodium hydroxide.
2. according to claim 1 coal mine machinery piece surface treatment process, it is characterized in that described method also comprises described salt bath to be handled workpiece desalts through cleaning successively, dry, immersion oil is handled and obtained the finished product workpiece.
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| CN2011102036432A CN102260844A (en) | 2011-07-20 | 2011-07-20 | Surface processing method for coal mining mechanical parts |
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| CN2011102036432A CN102260844A (en) | 2011-07-20 | 2011-07-20 | Surface processing method for coal mining mechanical parts |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104946217A (en) * | 2015-06-04 | 2015-09-30 | 苏州市宝玛数控设备有限公司 | Nucleating agent for low temperature fuzzy ball working solution |
| CN106048513A (en) * | 2016-07-13 | 2016-10-26 | 苏州市虎丘区浒墅关弹簧厂 | Machining technology of spring steel wire for pneumatic valve spring |
| CN106521497A (en) * | 2016-10-13 | 2017-03-22 | 广西大学 | Petroleum machine part surface treatment method |
| CN108149187A (en) * | 2017-12-26 | 2018-06-12 | 苏州贝尔纳德铁路设备有限公司 | A kind of wear-resisting preparation method for pulling out bar of hydraulic track-switching device |
| CN114231891A (en) * | 2021-11-23 | 2022-03-25 | 煤炭科学研究总院 | Surface treatment process for coal mine machinery |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104946217A (en) * | 2015-06-04 | 2015-09-30 | 苏州市宝玛数控设备有限公司 | Nucleating agent for low temperature fuzzy ball working solution |
| CN106048513A (en) * | 2016-07-13 | 2016-10-26 | 苏州市虎丘区浒墅关弹簧厂 | Machining technology of spring steel wire for pneumatic valve spring |
| CN106521497A (en) * | 2016-10-13 | 2017-03-22 | 广西大学 | Petroleum machine part surface treatment method |
| CN108149187A (en) * | 2017-12-26 | 2018-06-12 | 苏州贝尔纳德铁路设备有限公司 | A kind of wear-resisting preparation method for pulling out bar of hydraulic track-switching device |
| CN114231891A (en) * | 2021-11-23 | 2022-03-25 | 煤炭科学研究总院 | Surface treatment process for coal mine machinery |
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