CN102312838A - Piston for rotary compressor and manufacturing method of piston - Google Patents
Piston for rotary compressor and manufacturing method of piston Download PDFInfo
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- CN102312838A CN102312838A CN201010516257A CN201010516257A CN102312838A CN 102312838 A CN102312838 A CN 102312838A CN 201010516257 A CN201010516257 A CN 201010516257A CN 201010516257 A CN201010516257 A CN 201010516257A CN 102312838 A CN102312838 A CN 102312838A
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- piston
- rotary compressor
- nitriding
- nitriding treatment
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Abstract
The invention relates to a piston for a rotary compressor and a manufacturing method of the piston. A matrix material for manufacturing the piston is piston coarse aggregate made from a 10#-50# carbon steel material or ferrous low alloy steel containing Ni, Cr and Mo. The manufacturing method is characterized by comprising the following steps of: carrying out rough grinding on the piston coarse aggregate first, then carrying out thermostabilization treatment, then carrying out nitriding treatment after the thermostabilization treatment, and finely grinding or polishing the piston subjected to nitriding treatment. According to the invention, materials with low cost in the market are used, which can completely meet the using requirements after being subjected to thermal treatment and nitriding treatment and can successfully substitute Ni-Cr-Mo alloy cast iron which has been used for 30 years, therefore the purposes of energy saving and consumption reduction are achieved.
Description
Technical field
The present invention relates to a kind of rotary compressor with piston and production method thereof.
Background technique
Present rotary air condition compressor is the compressor of using always, and its working principle is as shown in Figure 1,1 cylinder wherein, 2 pistons, 3 slide plates.During compressor operating, piston 2 is made clockwise pure rolling along cylinder 1 endoporus, and slide plate 3 contacts with piston 2 under the spring force effect, cylinder 1 is divided into A, B two-part of sealing.When piston 2 was made clockwise pure rolling, chamber A enlarged-and air-breathing, chamber B reduces-compresses.When piston 2 rotated to lower dead centre, it is minimum that chamber B reduces to, and it is maximum that pressure reaches, and carries out exhaust.Continue rotation, then chamber A begins compression, and chamber B begins air-breathing, goes round and begins again.Piston is a vitals in the air condition compressor.
But along with environmental protection, energy-conservation and consumption reduction are required to improve constantly, the pressure of low fluorine, floride-free refrigerant is used and is placed on the agenda.And the popularization of frequency conversion, power-saving technology and use high-power, large capacity conditioner; And the exploitation of heat pump compressor and carbon-dioxide gas compressor; Its working pressure increases substantially (makes the air condition compressor of refrigerant as adopting R410a; Its operating pressure ratio adopts the compressor of R22 refrigerant to want high by 40%, reaches 26 ~ 28kg/cm
2), to requirements at the higher level are arranged in piston intensity, wear resistance, fatigue resistance and working life, therefore demand inventing the problem that novel piston material technology exists with solution urgently.
For a long time, the material of piston adopts the alloy cast iron that contains Ni, Cr, Mo usually, because the utilization ratio of casting material has only 50-60%, and cost is high, and pollution is big, develops the piston material of the high low energy consumption of a kind of stock utilization, becomes urgent demand.
Summary of the invention
The objective of the invention is to solve in the existing technology rotatable air condition compressor because of after working pressure increases substantially, can either improve and to reduce cost again working life, improve stock utilization in the production process simultaneously, reduce the environment protection type piston of environmental pollution.
The present invention designs rotary compressor and uses method for making piston; Comprise that body material is by the 10#--50# carbon steel material or contain the piston coarse fodder that the iron series low-alloy steel of Ni, Cr, Mo is processed; It is characterized in that: earlier the piston coarse fodder is roughly ground; Carry out heat stabilisation process then, carry out nitriding treatment again, again piston is finish grinded or polishes behind the nitriding treatment through after the heat stabilisation process.It is characterized in that: described heat stabilisation process is 500 ℃ of heating-up temperatures, and---900 ℃, holding time is 1 then---10 hours, the type of cooling was air cooling or furnace cooling, and number of processes is 1---3 times.It is characterized in that: heat stabilisation process can be that application of vacuum, atmosphere protection are handled or the unprotect air furnace is handled.It is characterized in that: nitriding treatment can be gas method, ion method, liquid processes.It is characterized in that: the gas method nitriding treatment is nitriding temperature 500-600 ℃, time 2-20 hour, can adopt hard nitrogenize or nitrocarburizing.It is characterized in that: the ion method nitriding treatment is nitriding temperature 500-600 ℃, time 2-20 hour, can adopt hard nitrogenize or nitrocarburizing.It is characterized in that: the liquid processes nitriding method is: adopt pollution-free cyanamide nitrogenize salt bath, and nitriding temperature 520-600 ℃, time 2-10 hour.It is characterized in that: the salt bath ion concentration component of pollution-free cyanamide is: Na
+% is 15-25%, K
+% is 15-30%, Li
+% is 1-5%, CNO
-% is 15--40%, CN
-% is 1-8%, CO
2 2-% is 10--30%.
Used piston coarse fodder comprises present the most widely used 10---50# steel, 20-40Cr, 20CrMnTi, 42CrMo, 38CrMoAi etc.Above-mentioned material has the favorable mechanical production process property, can be processed into the precision tube of degree of precision through hot rolling, cold-rolling process, is used for the piston manufacturing after the cut-out.Perhaps through cold hobbing, the warm extrusion straightening is connected into type piston matrix.
Piston matrix to through nitrogenize finish grindes or polishes, and makes it meet the requirements of machining accuracy.Surface hardness reaches more than the HV450 after making it reach nitrogenize for the finished product piston, and surfaces nitrided total infiltration layer is greater than 10um.
The material (10---50# steel, 20-40Cr, 20CrMnTi, 42CrMo, 38CrMoAi etc.) that the present invention selects all can be used for the manufacturing of piston matrix through hot rolling, cold rolling, precision tube that cold-drawing process is processed into degree of precision after the cut-out.Can also pass through cold-stamped method straight forming piston matrix for the part low carbon materials that the present invention relates to, the middle and high material with carbon element of part can be through the extruding straight forming piston matrix of heating.Method machining piston matrix through extruding helps improving the roughing precision, improves stock utilization simultaneously more efficiently.
Piston matrix to through nitrogenize finish grindes or polishes, and makes it meet the requirements of machining accuracy.
The present invention uses on the market material cheaply, can satisfy usage requirement fully through Overheating Treatment and nitrogenize, can successfully substitute the alloy cast iron of the Ni that used 30 years, Cr, Mo.Reached purpose energy-conservation, consumption reduction.
Core main points of the present invention are that material must pass through nitriding treatment, can reach the requirement in working life.The selected material of the present invention quenches the back without nitriding treatment through controlled atmosphere; Its hardness also can reach the above requirement of HV450; But because its hardness reaches through Kohlenstoffgehalt; The material friction coefficient is higher relatively, do not have the lubrication of graphite state carbon simultaneously, so usability has narrow limitation.
Description of drawings
Fig. 1 is used for the operation schematic representation of compressor for piston of the present invention.
Fig. 2 is diffusion layer of the present invention, matrix schematic representation, and Fig. 3 is the piston hardness gradient figure of the present invention through nitriding treatment.
Below in conjunction with instance the present invention is made detailed operation instruction.
Embodiment
Rotary compressor is used method for making piston; Comprise that body material is by the 10#--50# carbon steel material or contain the piston coarse fodder that the iron series low-alloy steel of Ni, Cr, Mo is processed; It is characterized in that: earlier the piston coarse fodder is roughly ground; Carry out heat stabilisation process then, carry out nitriding treatment again, again piston is finish grinded or polishes behind the nitriding treatment through after the heat stabilisation process.It is characterized in that: described heat stabilisation process is 500 ℃ of heating-up temperatures, and---900 ℃, holding time is 1 then---10 hours, the type of cooling was air cooling or furnace cooling, and number of processes is 1---3 times.It is characterized in that: heat stabilisation process can be that application of vacuum, atmosphere protection are handled or the unprotect air furnace is handled.It is characterized in that: nitriding treatment can be gas method, ion method, liquid processes.It is characterized in that: the gas method nitriding treatment is nitriding temperature 500-600 ℃, time 2-20 hour, can adopt hard nitrogenize or nitrocarburizing.It is characterized in that: the ion method nitriding treatment is nitriding temperature 500-600 ℃, time 2-20 hour, can adopt hard nitrogenize or nitrocarburizing.It is characterized in that: the liquid processes nitriding method is: adopt pollution-free cyanamide nitrogenize salt bath, and nitriding temperature 520-600 ℃, time 2-10 hour.It is characterized in that: the salt bath ion concentration component of pollution-free cyanamide is: Na
+% is 15-25%, K
+% is 20-30%, Li
+% is 1-5%, CNO
-% is 15--40%, CN
-% is 1-8%, CO
2 2-% is 10--30%.
Embodiment 1:
Piston adopts the 20CrMnTi material, through cold extrusion shaped piston matrix blank, through after the roughing; In the unprotect air furnace, carry out 580 ℃ of heat stabilisation process three times, through the nitrogenize of the laggard promoting the circulation of qi body of fine finishing, temperature is 550 ℃; Time is 8 hours, and feeding gas is ammonia and carbon dioxide.After fine finishing, reach service precision, form the diffusion layer of 30 um, surface hardness HV has reached usage requirement fully greater than 450.
Embodiment 2:
Piston adopts the 42CrMo material, through the molded piston matrix of warm extrusion blank, through after the roughing; In vacuum furnace, carry out 650 ℃ of heat stabilisation process twice, after fine finishing, carry out plasma nitriding, temperature is 560 ℃; Time is 10 hours, and feeding gas is ammonia and carbon dioxide.After fine finishing, reach service precision, form the diffusion layer of 30 um, surface hardness HV has reached usage requirement fully greater than 450.
Embodiment 3:
Piston adopts the 38CrMoAi material, through cold rolling one-tenth precision tube, cuts off by piston size; Through after the roughing, in ammonia pyrolysis gas atmosphere protection stove, carry out 800 ℃ of heat stabilisation process one time, after fine finishing, carry out the liquid salt bath nitriding treatment; Temperature is 570 ℃, and the time is 4 hours, ion concentration CNO
-% is 36%, CN
-% is 4%, CO
2 2-% is 19%, Na
+% is 21%, K
+% is 19%, Li
+% is 1.2%, after fine finishing, reaches service precision, forms the diffusion layer of 50 um, and surface hardness HV has reached usage requirement fully greater than 450.
Claims (8)
1.
Rotary compressor is used method for making piston; Comprise that body material is by the 10#--50# carbon steel material or contain the piston coarse fodder that the iron series low-alloy steel of Ni, Cr, Mo is processed; It is characterized in that: earlier the piston coarse fodder is roughly ground; Carry out heat stabilisation process then, carry out nitriding treatment again, again piston is finish grinded or polishes behind the nitriding treatment through after the heat stabilisation process.
2.
Use method for making piston by the described rotary compressor of claim 1; It is characterized in that: described heat stabilisation process is 500 ℃ of heating-up temperatures---900 ℃; Holding time is 1 then---10 hours, the type of cooling was air cooling or furnace cooling, and number of processes is 1---and 3 times.
3.
Use method for making piston by the described rotary compressor of claim 2, it is characterized in that: heat stabilisation process can be that application of vacuum, atmosphere protection are handled or the unprotect air furnace is handled.
4.
Use method for making piston by the described rotary compressor of claim 1, it is characterized in that: nitriding treatment can be gas method, ion method, liquid processes.
5.
Use method for making piston by the described rotary compressor of claim 4, it is characterized in that: the gas method nitriding treatment is nitriding temperature 500-600 ℃, time 2-20 hour, can adopt hard nitrogenize or nitrocarburizing.
6.
Use method for making piston by the described rotary compressor of claim 4, it is characterized in that: the ion method nitriding treatment is nitriding temperature 500-600 ℃, time 2-20 hour, can adopt hard nitrogenize or nitrocarburizing.
7.
Use method for making piston by the described rotary compressor of claim 4, it is characterized in that: the liquid processes nitriding method is: adopt pollution-free cyanamide nitrogenize salt bath, and nitriding temperature 520-600 ℃, time 2-10 hour.
8.
Use method for making piston by the described rotary compressor of claim 7, it is characterized in that: the salt bath ion concentration component of pollution-free cyanamide is: Na
+% is 15-25%, K
+% is 15-30%, Li
+% is 1-5%, CNO
-% is 15--40%, CN
-% is 1-8%, CO
2 2-% is 10--30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010516257A CN102312838A (en) | 2010-10-22 | 2010-10-22 | Piston for rotary compressor and manufacturing method of piston |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010516257A CN102312838A (en) | 2010-10-22 | 2010-10-22 | Piston for rotary compressor and manufacturing method of piston |
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| CN102312838A true CN102312838A (en) | 2012-01-11 |
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| CN201010516257A Pending CN102312838A (en) | 2010-10-22 | 2010-10-22 | Piston for rotary compressor and manufacturing method of piston |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102814625A (en) * | 2012-08-21 | 2012-12-12 | 南京利民机械有限责任公司 | Method for machining parts with high-hardness and high-abrasion-resistance surfaces |
| CN103882370A (en) * | 2014-03-24 | 2014-06-25 | 合肥美桥汽车传动及底盘***有限公司 | 42CrMo or 40Cr steering knuckle nitrocarburizing treatment process |
| CN104100481A (en) * | 2013-04-09 | 2014-10-15 | 罗伯特·博世有限公司 | Piston unit and hydrostatic radial piston machine |
| CN104723042A (en) * | 2015-04-09 | 2015-06-24 | 四川华都核设备制造有限公司 | Linear motor control rod drive mechanism rotor lever manufacturing technological method |
| CN105344965A (en) * | 2015-11-16 | 2016-02-24 | 连云港江南精工机械有限公司 | Preparation method of die-casting machine part |
| CN107420309A (en) * | 2017-08-30 | 2017-12-01 | 广东美芝制冷设备有限公司 | Rotary compressor piston and preparation method thereof |
| CN112576507A (en) * | 2019-09-27 | 2021-03-30 | 安徽美芝精密制造有限公司 | Manufacturing method of compressor piston and compressor piston |
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| CN1102459A (en) * | 1993-07-29 | 1995-05-10 | 株式会社日立制作所 | A rotary type compressor |
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| CN101724741A (en) * | 2008-10-20 | 2010-06-09 | 乐金电子(天津)电器有限公司 | Method for manufacturing compressor crankshaft |
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| CN1102459A (en) * | 1993-07-29 | 1995-05-10 | 株式会社日立制作所 | A rotary type compressor |
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| JP2007321676A (en) * | 2006-06-01 | 2007-12-13 | Mitsubishi Electric Corp | Rotary compressor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102814625A (en) * | 2012-08-21 | 2012-12-12 | 南京利民机械有限责任公司 | Method for machining parts with high-hardness and high-abrasion-resistance surfaces |
| CN104100481A (en) * | 2013-04-09 | 2014-10-15 | 罗伯特·博世有限公司 | Piston unit and hydrostatic radial piston machine |
| CN104100481B (en) * | 2013-04-09 | 2018-09-07 | 罗伯特·博世有限公司 | The radial piston machine of piston unit and hydrostatic |
| CN103882370A (en) * | 2014-03-24 | 2014-06-25 | 合肥美桥汽车传动及底盘***有限公司 | 42CrMo or 40Cr steering knuckle nitrocarburizing treatment process |
| CN104723042A (en) * | 2015-04-09 | 2015-06-24 | 四川华都核设备制造有限公司 | Linear motor control rod drive mechanism rotor lever manufacturing technological method |
| CN105344965A (en) * | 2015-11-16 | 2016-02-24 | 连云港江南精工机械有限公司 | Preparation method of die-casting machine part |
| CN107420309A (en) * | 2017-08-30 | 2017-12-01 | 广东美芝制冷设备有限公司 | Rotary compressor piston and preparation method thereof |
| CN112576507A (en) * | 2019-09-27 | 2021-03-30 | 安徽美芝精密制造有限公司 | Manufacturing method of compressor piston and compressor piston |
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Owner name: ZHEJIANG BAIDA PRECISION INDUSTRY CO., LTD. Free format text: FORMER OWNER: TAIZHOU BAIDA REFRIGERATION CO., LTD. Effective date: 20120314 |
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Effective date of registration: 20120314 Address after: 318000 No. 908, Lane 28, Middle Road, Taizhou, Zhejiang Applicant after: Zhejiang Baida Precision Co., Ltd. Address before: 318000 No. 908, Lane 28, Middle Road, Taizhou, Zhejiang Applicant before: Taizhou Baida Refrigeration Co., Ltd. |
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Application publication date: 20120111 |