CN105695931A - Chromium plating process for small shaft parts - Google Patents
Chromium plating process for small shaft parts Download PDFInfo
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- CN105695931A CN105695931A CN201410687626.4A CN201410687626A CN105695931A CN 105695931 A CN105695931 A CN 105695931A CN 201410687626 A CN201410687626 A CN 201410687626A CN 105695931 A CN105695931 A CN 105695931A
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- chromium plating
- little axle
- axle part
- retention time
- tank
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Abstract
The invention relates to a chromium plating process for small shaft parts. The process comprises the following steps: (1) uniformly mixing small shaft parts with a chromium plating agent in proportion and then filling a chromium plating tank with the obtained mixture; (2) sealing the chromium plating tank, then placing the chromium plating tank into an electric furnace and sealing the door of the electric furnace; (3) carrying out segmented heating and insulation; (5) carrying out chromium plating; (5) carrying out cooling; (6) opening the chromium plating tank, pouring out the mixture in the tank, sorting out the small shaft parts and carrying out sieving to thoroughly remove the chromium plating agent; and (7) carrying out hardening and tempering. The special chromium plating agent used in the invention is prepared from alumina, ferrochrome powder and ammonium chloride according to a weight ratio of 55%: 42%: 3%. The chromium plating process has the advantages that simple equipment is used, so investment for the equipment is small; small damage is posed to the equipment, so the service life of the equipment is prolonged accordingly; coarsening of a gold substrate can be prevented, the chromium-plated small shafts have bend ductility of an angle of 45 degrees and cannot be broken off at the angle; and uniformity of chromium plating layers among the parts can be ensured, and the wear resistant and corrosion resistance of the small shafts are greatly improved.
Description
Technical field
The present invention relates to a kind of little axle part chrome-plated process。
Background technology
It is a kind of raising piece surface hardness in ferrous element chrome-faced method, increases part wearability and corrosion proof common method, by people's extensive use。At present, the following problem of chrome-plating method ubiquity that domestic and foreign literature report and patented technology are introduced: 1, cost is high, and equipment investment is bigger；2, chromium plating temperature range is 950 DEG C one 1150 DEG C, and temperature is higher, can bring the defect such as corrosion between coarse grains and lattice to metallic matrix, can affect subsequent heat treatment quality after chromium plating simultaneously, as matrix loses toughness, and the defect such as bring pulling force defective；3, there is no zone heating method, but direct temperature-raising method, therefore in heating process, the gas produced expands suddenly, it is easy to produce to wash cover open, is directed at later stage intensification and terminates with chromium plating, cover must reopen fire door after washing open, take out chromium plating tank, again mix and stir, tinning, the operation such as sealing, cause rejection and waste。It addition, the temperature homogeneity that directly temperature-raising method causes tank center peripheral with tank is poor, thus bringing the chromium coating between part uneven。
Summary of the invention
The technical problem to be solved in the present invention is exactly the problems such as existing chrome-plated process cost is high, equipment investment is big, chromium plating temperature is high, chromium coating is uneven, there is provided a kind of simple for people, small investment, chromium plating temperature is low, the straightforward procedure of the mould part chromium plating of the obvious little axle of effect。
Technical scheme is as follows:
A kind of little axle part chrome-plated process is provided, comprises the steps:
(1) loading chromium plating tank by after little axle part and chromium plating agent Homogeneous phase mixing in proportion, aforementioned chromium plating agent is pressed by aluminium oxide, ferrochrome powder, ammonium chloride: 55%, the weight ratio of 42%, 3% is formulated；
(2) put into electric furnace and seal fire door after chromium plating tank being sealed；
(3) zone heating and insulation are carried out: be warming up to 200 DEG C, temperature retention time 1 hour；It is warming up to 400 DEG C, temperature retention time 2 hours；It is warming up to 450 DEG C, temperature retention time 1 hour；It is warming up to 600 DEG C, temperature retention time 1 hour；It is warming up to 800 DEG C, temperature retention time 1 hour；
(4) chromium plating processes: be warmed up to 900 DEG C-920 DEG C from 800 DEG C, temperature retention time 11 hours；
(5) cooling: cutting off the electricity supply, crack fire door is as cold as 700 DEG C, then standard-sized sheet fire door is as cold as 500 DEG C, removes chromium plating tank outside stove, and air cooling is to room temperature；
(6) chromium plating tank is opened, mixture in pouring pot, sub-elect little axle part, Ex-all chromium plating agent of sieving；
(7) modified: high tempering after little axle part is quenched。
Step (8) is may also include: undertaken rolling bright by the chromium plating little axle part after modified, wipe oil and chip after step (7)。
Tank bottoms and the chromium plating agent all having 10-15mm thick of binding of chromium plating tank。
The part by weight of the medium and small axle part of step (l) and chromium plating agent is 1:1.8-1:3。
Being mix and stir fire clay, the thick shape of furnishing half with common waterglass in step (2), chromium plating tank is sealed by the gap uniformly sticking with paste full lid。
Step (6) is sort little axle part by the mode of Magnet sucking-off。
Step (7) hardening heat is 880 DEG C, temperature retention time 25 minutes；Temperature is 150 DEG C, temperature retention time 30 minutes。
Chromium plating little axle part being rolled bright in step (8) is roll in a hexagonal rotating cylinder, and the time is 30 minutes。
Present invention have the advantage that
1, adopting the box high temperature resistance furnace of country's sizing, the market price is relatively low, it is easy to purchase, simpler than the equipment of other chromium plating, and small investment；
2, owing to chromium plating temperature of the present invention is 900 DEG C-920 DEG C, lower than the temperature of other chromium plating 50 DEG C-230 DEG C, therefore can avoid the coarse grains of metallic matrix, after chromium plating, the counter-bending toughness of little axle can reach 45 degree of angles and not fracture；Simultaneously that the infringement of equipment is little so that the service life of equipment extends accordingly；
3, owing to the present invention adopts zone heating thermal-insulating method, thus unnecessary unexpected rejection and waste can be avoided, the stepped uniform rising of temperature that Ke Shiguan center is peripheral with tank simultaneously, it is ensured that the uniformity of chromium coating between part；
4, the present invention can make little axle plated surface enter metallic atom chromium, chromium atom generates chromium carbide compound with little axle matrix surface carbon atom, chromium carbide has high hardness, employing reaches 1300HVO.2kg, even if so also can extend in running up accordingly through the service life of the product such as chain of the little axle assembling of present invention process。
5, the present invention spends less investment, just can give the chromium plating equably of little axial workpiece。Little axle chromium coating thickness after chromium plating reaches 7-8um, chromium coating microhardness is up to 1300-1600HV, little axle anti-wear performance and corrosion resisting property are greatly improved, this little axle can be used to make the chain hinge pin of high-intensity high-speed operating, it is possible to is used for making the needle roller of the needle bearing that high abrasion runs up。
Detailed description of the invention
Embodiment 1:
The little axle part of 2mm in diameter, length 9mm is carried out chromium plating process, and its concrete steps and process conditions are as follows:
(1) chromium plating tank is loaded after little axle and chromium plating agent uniformly being mixed and stirred by weight 1:2.75。
(2) fire clay is mixed and stirred with common waterglass, the thick shape of furnishing half, tightly seal chromium plating cover, uniformly stick with paste the gap of full lid, again by canned for the chromium plating obturaged enter in high temperature box type resistance furnace, uniformly occupy according to size of burner hearth, 3-5 chromium plating tank can be put, close fire door, recycle silicon acid alumiseal fire door。
(3) zone heating and insulation: be warming up to 200 DEG C, is incubated 1 hour；It is warmed up to 400 DEG C, is incubated 2 hours；It is warming up to 450 DEG C, temperature retention time 1 hour；It is warming up to 600 DEG C, temperature retention time 1 hour；It is warming up to 800 DEG C, temperature retention time 1 hour。(4) chromium plating treatment temperature and time: be warming up to 900 DEG C from 800 DEG C, it is incubated 11 hours, the carbonization layers of chrome of 7-18um thickness can be obtained。
(5) cooling: cutting off the electricity supply, crack fire door is cooled to 700 DEG C, then standard-sized sheet fire door is cooled to 500 DEG C, removes chromium plating tank outside stove, and air cooling, to room temperature, then destroys the sealant of waterglass and fire clay with chisel or hammer, removes cover, mixture in pouring pot。
(6) little axle and chromium plating agent are sorted: with the little axle of Magnet sucking-off, Ex-all chromium plating agent of sieving, now little axle surface is canescence。
(7) modified: by little for chromium plating axle high tempering after meshbeltfurnace quenches, hardening heat 880 DEG C, temperature retention time 25 minutes；Temperature 150 DEG C, temperature retention time 30 minutes。
(8) modified little axle is rolled bright, little axle is placed on a hexagonal and turns in letter and roll, 30 minutes time。The chip of wipe oil and residual, then carries out checking use。
Embodiment 2:
The little axle part of diameter 2.4mm, length 6.25-11mm is carried out chromium plating process, and its concrete steps are identical with embodiment 1, the difference is that:
The mixed proportion of step (1) medium and small axle and chromium plating agent is weight ratio 1:2。
Chromium plating treatment temperature and time in step (4): be warming up to 920 DEG C from 800 DEG C, it is incubated 11 hours, the carbonization layers of chrome of 7-18um thickness can be obtained。
Claims (8)
1. one kind little axle part chrome-plated process, it is characterised in that comprise the steps:
(1) loading chromium plating tank by after little axle part and chromium plating agent Homogeneous phase mixing in proportion, aforementioned chromium plating agent is pressed by aluminium oxide, ferrochrome powder, ammonium chloride: 55%, the weight ratio of 42%, 3% is formulated；
(2) put into electric furnace and seal fire door after chromium plating tank being sealed；
(3) zone heating and insulation are carried out: be warming up to 200 DEG C, temperature retention time 1 hour；It is warming up to 400 DEG C, temperature retention time 2 hours；It is warming up to 450 DEG C, temperature retention time 1 hour；It is warming up to 600 DEG C, temperature retention time 1 hour；It is warming up to 800 DEG C, temperature retention time 1 hour；
(4) chromium plating processes: be warmed up to 900 DEG C-920 DEG C from 800 DEG C, temperature retention time 11 hours；
(5) cooling: cutting off the electricity supply, crack fire door is as cold as 700 DEG C, then standard-sized sheet fire door is as cold as 500 DEG C, removes chromium plating tank outside stove, and air cooling is to room temperature；
(6) chromium plating tank is opened, mixture in pouring pot, sub-elect little axle part, Ex-all chromium plating agent of sieving；
(7) modified: high tempering after little axle part is quenched。
2. little axle part chrome-plated process according to claim 1, it is characterised in that may also include step (8) after step (7): undertaken rolling bright by the chromium plating little axle part after modified, wipe oil and chip。
3. little axle part chrome-plated process according to claim 1 and 2, it is characterised in that the tank bottoms and chromium plating agent all having 10-15mm thick of binding of chromium plating tank。
4. little axle part chrome-plated process according to claim 1 and 2, it is characterised in that the part by weight of the medium and small axle part of step (l) and chromium plating agent is 1:1.8-1:3。
5. little axle part chrome-plated process according to claim 1 and 2, it is characterised in that being mix and stir fire clay, the thick shape of furnishing half with common waterglass in step (2), chromium plating tank is sealed by the gap uniformly sticking with paste full lid。
6. little axle part chrome-plated process according to claim 1 and 2, it is characterised in that be sort little axle part by the mode of Magnet sucking-off in step (6)。
7. little axle part chrome-plated process according to claim 1, it is characterised in that step (7) hardening heat is 880 DEG C, temperature retention time 25 minutes；Temperature is 150 DEG C, temperature retention time 30 minutes。
8. little axle part chrome-plated process according to claim 2, it is characterised in that chromium plating little axle part being rolled bright in step (8) is roll in a hexagonal rotating cylinder, and the time is 30 minutes。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410687626.4A CN105695931A (en) | 2014-11-26 | 2014-11-26 | Chromium plating process for small shaft parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410687626.4A CN105695931A (en) | 2014-11-26 | 2014-11-26 | Chromium plating process for small shaft parts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105695931A true CN105695931A (en) | 2016-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410687626.4A Pending CN105695931A (en) | 2014-11-26 | 2014-11-26 | Chromium plating process for small shaft parts |
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| CN (1) | CN105695931A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106891606A (en) * | 2017-03-07 | 2017-06-27 | 龙游运申制版有限公司 | A kind of roller is with without net processing technology |
| CN107313079A (en) * | 2017-07-31 | 2017-11-03 | 安徽沃德气门制造有限公司 | A kind of automobile air valve rapid chrome plating technique |
| CN111074202A (en) * | 2019-12-31 | 2020-04-28 | 天津先知邦科技股份有限公司 | Long-acting stress corrosion cracking resistant segment bolt and manufacturing method thereof |
| CN112139880A (en) * | 2020-08-21 | 2020-12-29 | 湖北隐冠轴业有限公司 | Geometric shape precision machining method for hollow rotating shaft of motor |
| RU2794655C1 (en) * | 2023-02-22 | 2023-04-24 | Федеральное государственное автономное образовательное учреждение высшего образования "Южно-Уральский государственный университет (национальный исследовательский университет)" ФГАОУ ВО "ЮУрГУ (НИУ)" | Method of thermal diffusion chromium plating of steels and iron-based alloys using cumulative grids |
-
2014
- 2014-11-26 CN CN201410687626.4A patent/CN105695931A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106891606A (en) * | 2017-03-07 | 2017-06-27 | 龙游运申制版有限公司 | A kind of roller is with without net processing technology |
| CN107313079A (en) * | 2017-07-31 | 2017-11-03 | 安徽沃德气门制造有限公司 | A kind of automobile air valve rapid chrome plating technique |
| CN111074202A (en) * | 2019-12-31 | 2020-04-28 | 天津先知邦科技股份有限公司 | Long-acting stress corrosion cracking resistant segment bolt and manufacturing method thereof |
| CN112139880A (en) * | 2020-08-21 | 2020-12-29 | 湖北隐冠轴业有限公司 | Geometric shape precision machining method for hollow rotating shaft of motor |
| RU2794655C1 (en) * | 2023-02-22 | 2023-04-24 | Федеральное государственное автономное образовательное учреждение высшего образования "Южно-Уральский государственный университет (национальный исследовательский университет)" ФГАОУ ВО "ЮУрГУ (НИУ)" | Method of thermal diffusion chromium plating of steels and iron-based alloys using cumulative grids |
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Application publication date: 20160622 |