CN102909372B - Manufacturing method for valve plate of compressor - Google Patents

Manufacturing method for valve plate of compressor Download PDF

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Publication number
CN102909372B
CN102909372B CN201110223047.0A CN201110223047A CN102909372B CN 102909372 B CN102909372 B CN 102909372B CN 201110223047 A CN201110223047 A CN 201110223047A CN 102909372 B CN102909372 B CN 102909372B
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powder
manufacture method
stainless steel
manganese
chromium
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CN102909372A (en
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包崇玺
毛增光
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NBTM New Materials Group Co Ltd
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NBTM New Materials Group Co Ltd
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Abstract

The invention relates to a manufacturing method for a valve plate of a compressor. The manufacturing method sequentially comprises the following steps: (1) designing the composition of materials; (2) mixing; (3) designing a die; (4) forming; (5) sintering; (6) quenching; (7) tempering; (8) machining; (9) nitriding; and (10) finish machining. The manufacturing method has the advantages that firstly, the machining efficiency is improved, the die pressing method is adopted for powder metallurgy, the machining efficiency is higher, and the forming speed can reach over 15 pieces per minute; secondly, the utilization ratio of the raw materials is high. A large amount of leftover material is produced inevitably in the traditional machining method, the utilization ratio is low. However, the comprehensive utilization ratio is more than 95% in the powder metallurgy forming method; and finally, the product consistency is high. The size accuracy can be ensured completely by the die, the working allowance of blanks can be reduced. Meanwhile, the machining efficiency is improved. The frictional force between the valve plate and a roller sleeve is reduced after nitriding, and the abrasive resistance of the valve plate is improved.

Description

A kind of manufacture method of compressor valve plate
Technical field
The present invention relates to compressor field, especially a kind of manufacture method of compressor valve plate.
Background technology
For rotary compressor, there is the advantages such as efficiency is high, compact conformation, volume are little, lightweight, therefore in air-conditioning, widely use this compressor.The valve block of compressor, the bias rolling roll sleeve close contact with compressor, in use bears certain pressure, and on roll sleeve high-speed slide, wearing and tearing very easily appears in the part that therefore valve block contacts with roll sleeve.For valve block, need lower coefficient of friction, higher fatigue performance and decay resistance.
Existing patent publication No. is the Chinese patent " a kind of manufacture method of compressor sliding blade " of CN 1424510, mainly comprises the following steps (1) and selects materials: select suitable stainless steel; (2) cutting, setting z cut out slide plate according to the shape wire cutting method of slide plate, then mill out groove (3) vacuum heat with milling cutter; (4) grinding, polishing: carry out grinding, polishing respectively according to six faces of slide plate; (5) gas nitriding: the slide plate after grinding, polishing is carried out ammonia nitriding; (6) grinding: the slide plate after nitriding is ground to surface again and meets the requirements.Its raw material use the stainless steel of SUS440c or 11Cr17, adopt the mode of Linear cut to process.Have again the patent No. to be the Chinese patent " manufacture method of compressor sliding blade " of CN200710066764.0, its steel used is 7Cr17 or 9Cr18, is also to adopt the mode of Linear cut to process.This technique uses steel to carry out processing valve block, and its working (machining) efficiency is lower, and processing cost is higher.
Summary of the invention
Technical problem to be solved by this invention is to provide the manufacture method of compressor valve plate of a kind of high efficiency, low cost.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of manufacture method of compressor valve plate, it is characterized in that adopting the method for powder metallurgy to carry out compression molding, and step is followed successively by:
1) designing material composition: adopt sintered stainless steel as the material of valve block;
2) batch mixing: by graphite powder 0.2 ~ 1.6%; Copper powder 0 ~ 4%; Powder compacting lubricant 0.3 ~ 1.0%; Stainless steel powder 93.4 ~ 99.5% mixes; The chemical composition of wherein said stainless steel powder is carbon: 0 ~ 1.5%, nickel: 0 ~ 3%, molybdenum: 0 ~ 2%, chromium: 11 ~ 20%, manganese: 0 ~ 2%, and silicon: 0 ~ 1% is no more than the inevitable impurity of 2%, iron: surplus, and above-mentioned percentage is mass percent;
3) shaping: the mould designed is installed on machine for compacting formation of metallic powder, and above-mentioned mixed-powder is suppressed, obtain green compact;
4) green compact carried out successively sinter, quench, temper;
5) valve block is carried out preliminary working according to drawing;
6) nitrogen treatment;
7) finally fine finishining is carried out to valve block, reach the dimensional accuracy of needs.
Preferably, the chemical composition of described sintered stainless steel is carbon: 0.1 ~ 1%, copper: 0 ~ 4%, nickel: 0 ~ 3%, molybdenum: 0 ~ 2%, chromium: 11 ~ 20%, manganese: 0 ~ 2%, silicon: 0 ~ 1%, be no more than the inevitable impurity of 2%, iron: surplus, above-mentioned percentage is mass percent.
As preferably, the density of described green compact is 6.4 ~ 7.3g/cm 3.
As improvement, the temperature of described sintering is 1050 ~ 1350 DEG C, and the time is no less than 20 minutes, and the atmosphere of sintering is nitrogen-based atmosphere or vacuum, and sintering furnace is meshbeltfurnace or push rod furnace or clock hood type furnace or vacuum drying oven.
As improvement, the temperature of described temper is 150 ~ 400 DEG C, 1 ~ 4 hour time.
Improve, described nitrogen treatment adopts the salt Bath Nitriding Treatment such as plasma nitridation process or employing again.
Preferably, the chemical composition of described sintered stainless steel is carbon 0.6%, chromium 13%, manganese: 0.5%, silicon: 0.5%, and the inevitable impurity being less than 2%, and surplus is iron, and above-mentioned percentage is mass percent.
Preferably, the chemical composition of described sintered stainless steel is carbon 0.8%, chromium 17%, manganese: 0.5%, silicon: 0.5%, molybdenum: 1%, and the inevitable impurity being less than 2%, and surplus is iron, and above-mentioned percentage is mass percent.
Finally, the chemical composition of described sintered stainless steel is preferably carbon 0.8%, chromium 17%, manganese: 0.5%, silicon: 0.5%, and is less than the inevitable impurity of 2%, and surplus is iron, and above-mentioned percentage is mass percent.
Compared with prior art, the invention has the advantages that:
Adopt the method for powder metallurgy compression molding to manufacture, compared with traditional machining mode, it is advantageous that: one, improve working (machining) efficiency.Powder metallurgy adopts the mode of mold pressing, and working (machining) efficiency is higher, and shaping speed is per minute can up to more than 15; Its two, utilization rate of raw materials is high.Traditional machining mode, the leftover pieces that inevitable generation is a large amount of, utilization rate is lower, and powder metallurgy forming mode, compound material utilization rate is more than 95%; Its three, homogeneity of product is high.Dimensional accuracy can be ensured by mould completely, can reduce the allowance of blank, meanwhile, improves the efficiency of processing.And will the frictional force between valve block and roll sleeve be reduced after nitrogen treatment, improve the wearability of valve block.
Accompanying drawing explanation
Fig. 1 a, 1b, 1c are the schematic diagram of compressor valve plate of the present invention;
Fig. 2 is the metallographic structure of the plasma nitrided rear valve block of embodiment 1;
Fig. 3 is the metallographic structure of valve block after embodiment 2 salt-bath nitriding;
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Embodiment 1
1) designing material composition: in valve block, the composition of stainless steel powder is carbon is 0.6%, and chromium is 13%, manganese: 0.5%, silicon: 0.5%, and is less than the inevitable impurity of 2%, Yu Weitie.
2) batch mixing
Be graphite powder by component: 0.7%; Powder compacting lubricant: 0.6%; SS410 stainless steel powder: the powder of 98.7% mixes.
3) designing mould: according to the product drawing design powder metallurgy forming mould of Fig. 1.
4) shaping: mould is installed on machine for compacting formation of metallic powder, and above-mentioned mixed-powder is suppressed, green density 6.9g/cm 3.
5) sinter: sintering temperature is 1300 DEG C, 30 minutes time.
6) quench: the hardness of valve block is quenched into designing requirement.
7) tempering: hard-tempered valve block is carried out tempering, temperature is 200 DEG C, time 2 h.
8) process: valve block is carried out preliminary working according to Fig. 1.
9) nitrogen treatment: the valve block processed is carried out plasma nitridation process.
After sintering, macrohardness is HRC22-27, density 7.4g/cm 3.After heat-treatment quenching, hardness is HRC52-56.After plasma nitrided, the hardness of matrix is HV0.1: 555-580, and the microhardness of nitration case is greater than HV0.1: 1100 (metallographic of nitration case is shown in Fig. 2).
Embodiment 2
1) designing material composition: in valve block, the composition of stainless steel powder is carbon is 0.8%, and chromium is 17%, molybdenum: 1%, manganese: 0.5%, silicon: 0.5%, and is less than the inevitable impurity of 2%, Yu Weitie.
2) batch mixing
Be graphite powder by component: 0.9%; Powder compacting lubricant: 0.6%; SS434 stainless steel powder: the powder of 98.5% mixes.
3) designing mould: according to the product drawing design powder metallurgy forming mould of Fig. 1.
4) shaping: mould is installed on machine for compacting formation of metallic powder, and above-mentioned mixed-powder is suppressed, green density 6.7g/cm 3.
5) sinter: sintering temperature is 1280 DEG C, 30 minutes time.
6) quench: the hardness of valve block is quenched into designing requirement.
7) tempering: hard-tempered valve block is carried out tempering, temperature is 200 DEG C, time 2 h.
8) process: valve block is carried out preliminary working according to Fig. 1.
9) nitrogen treatment: the valve block processed is carried out salt Bath Nitriding Treatment.
After sintering, macrohardness is HRC33-34, density 7.6g/cm 3.After heat-treatment quenching, hardness is HRC55-58.After plasma nitrided, the hardness of matrix is HRC39-41, and the microhardness of nitration case is greater than HV0.1: 1060 (metallographic of nitration case is shown in Fig. 3).
Embodiment 3
1) designing material composition: in valve block, the composition of stainless steel powder is carbon is 0.6%, and chromium is 13%, manganese: 0.5%, silicon: 0.5%, nickel: 2%, and is less than the inevitable impurity of 2%, Yu Weitie.
2) batch mixing
Be graphite powder by component: 0.7%; Powder compacting lubricant: 0.6%; SS410 stainless steel powder: 94.7%; Electrolytic copper powder: 2%; Carbonyl nickel powder: the powder of 2% mixes.Here it should be noted that therefore we have added the nickel of about 2% again, to meet the composition requirement of stainless steel powder in valve block owing to not containing Mo and Ni in SS410 stainless steel powder.
3) designing mould: according to the product drawing design powder metallurgy forming mould of Fig. 1.
4) shaping: mould is installed on machine for compacting formation of metallic powder, and above-mentioned mixed-powder is suppressed, green density 6.9g/cm 3.
5) sinter: sintering temperature is 1250 DEG C, 30 minutes time.
6) quench: the hardness of valve block is quenched into designing requirement.
7) tempering: hard-tempered valve block is carried out tempering, temperature is 200 DEG C, time 2 h.
8) process: valve block is carried out preliminary working according to Fig. 1.
9) nitrogen treatment: the valve block processed is carried out plasma nitridation process.
After sintering, macrohardness is HRC25-29, density 7.6g/cm 3.After heat-treatment quenching, hardness is HRC54-58.

Claims (9)

1. a manufacture method for compressor valve plate, it is characterized in that adopting the method for powder metallurgy to carry out compression molding, step is followed successively by:
1) designing material composition: adopt sintered stainless steel as the material of valve block;
2) batch mixing: by graphite powder 0.2 ~ 1.6%; Copper powder 0 ~ 4%; Powder compacting lubricant 0.3 ~ 1.0%; Stainless steel powder 93.4 ~ 99.5% mixes; Wherein said stainless steel powder chemical composition be carbon: 0 ~ 1.5%, nickel: 0 ~ 3%, molybdenum: 0 ~ 2%, chromium: 11 ~ 20%, manganese: 0 ~ 2%, silicon: 0 ~ 1%, is no more than the inevitable impurity of 2%, iron: surplus, and above-mentioned percentage is mass percent;
3) shaping: the mould designed is installed on machine for compacting formation of metallic powder, and above-mentioned mixed-powder is suppressed, obtain green compact;
4) green compact carried out successively sinter, quench, temper;
5) valve block is carried out preliminary working according to drawing;
6) nitrogen treatment;
7) finally fine finishining is carried out to valve block, reach the dimensional accuracy of needs.
2. manufacture method according to claim 1, it is characterized in that the chemical composition of described sintered stainless steel is: carbon: 0.1 ~ 1%, nickel: 0 ~ 3%, molybdenum: 0 ~ 2%, chromium: 11 ~ 20%, manganese: 0 ~ 2%, silicon: 0 ~ 1%, be no more than the inevitable impurity of 2%, iron: surplus, above-mentioned percentage is mass percent.
3. manufacture method according to claim 1, is characterized in that the density of described green compact is 6.4 ~ 7.3g/cm 3.
4. manufacture method according to claim 1, it is characterized in that the temperature of described sintering is 1050 ~ 1350 DEG C, the time is no less than 20 minutes, and the atmosphere of sintering is nitrogen-based atmosphere or vacuum, and sintering furnace is meshbeltfurnace or push rod furnace or clock hood type furnace or vacuum drying oven.
5. manufacture method according to claim 1, is characterized in that the temperature of described temper is 150 ~ 400 DEG C, 1 ~ 4 hour time.
6. manufacture method according to claim 1, is characterized in that described nitrogen treatment adopts the salt Bath Nitriding Treatment such as plasma nitridation process or employing.
7. manufacture method according to claim 2, is characterized in that the chemical composition of described sintered stainless steel is carbon 0.6%, chromium 13%, manganese: 0.5%, silicon: 0.5%, and the inevitable impurity being less than 2%, surplus is iron, and above-mentioned percentage is mass percent.
8. manufacture method according to claim 2, is characterized in that the chemical composition of described sintered stainless steel is carbon 0.8%, chromium 17%, manganese: 0.5%, silicon: 0.5%, molybdenum: 1%, and being less than the inevitable impurity of 2%, surplus is iron, and above-mentioned percentage is mass percent.
9. manufacture method according to claim 2, is characterized in that the chemical composition of described sintered stainless steel is carbon 0.8%, chromium 17%, manganese: 0.5%, silicon: 0.5%, and the inevitable impurity being less than 2%, surplus is iron, and above-mentioned percentage is mass percent.
CN201110223047.0A 2011-08-03 2011-08-03 Manufacturing method for valve plate of compressor Active CN102909372B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110607491A (en) * 2018-06-15 2019-12-24 马勒国际有限公司 Method for producing powder metallurgy product

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CN104148646B (en) * 2014-08-21 2016-08-17 宁波市群星粉末冶金有限公司 The preparation method of air compressor moving plate
CN108841326B (en) * 2018-05-24 2020-08-14 江苏昊科汽车空调有限公司 Wear-resistant and corrosion-resistant air valve plate of air conditioner compressor and spraying method
CN110964949A (en) * 2019-09-29 2020-04-07 辉门环新(安庆)粉末冶金有限公司 Sintering method of powder metallurgy lining of stainless steel substrate
CN111774573A (en) * 2020-08-06 2020-10-16 滁州市汊河之星高新技术研发有限公司 Manufacturing method of suction valve plate of vortex type automobile air conditioner compressor
CN112647023A (en) * 2020-12-14 2021-04-13 苏州莱特复合材料有限公司 Rack tooth block for automobile steering column energy absorption device and production process thereof

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JPH07188859A (en) * 1993-12-28 1995-07-25 Daido Steel Co Ltd Powder high speed steel
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CN101927348A (en) * 2009-06-24 2010-12-29 东睦新材料集团股份有限公司 Method for manufacturing pneumatic or electric tool taping block
CN101941069A (en) * 2010-05-22 2011-01-12 十堰东明斯汽车零部件有限公司 Synchronizer tooth holder of gear box and powder metallurgical production process method
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Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
JPH07188859A (en) * 1993-12-28 1995-07-25 Daido Steel Co Ltd Powder high speed steel
CN101486098A (en) * 2008-01-17 2009-07-22 东睦新材料集团股份有限公司 Method for preparing high-hardness wear-resistant powder metallurgical rolling sleeve
CN101927348A (en) * 2009-06-24 2010-12-29 东睦新材料集团股份有限公司 Method for manufacturing pneumatic or electric tool taping block
CN102000825A (en) * 2009-09-02 2011-04-06 东睦新材料集团股份有限公司 Method for manufacturing driving gear of motorcycle clutch
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