CN105200322A - High-strength automobile part powder metallurgy component and preparation method thereof - Google Patents
High-strength automobile part powder metallurgy component and preparation method thereof Download PDFInfo
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- CN105200322A CN105200322A CN201510709984.5A CN201510709984A CN105200322A CN 105200322 A CN105200322 A CN 105200322A CN 201510709984 A CN201510709984 A CN 201510709984A CN 105200322 A CN105200322 A CN 105200322A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000004663 powder metallurgy Methods 0.000 title abstract description 14
- 238000005245 sintering Methods 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 24
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 238000003825 pressing Methods 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 99
- 239000000843 powder Substances 0.000 claims description 79
- 229910052742 iron Inorganic materials 0.000 claims description 47
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 21
- 239000003921 oil Substances 0.000 claims description 16
- 238000005496 tempering Methods 0.000 claims description 15
- 229910052698 phosphorus Inorganic materials 0.000 claims description 14
- 229910052759 nickel Inorganic materials 0.000 claims description 13
- 229910052750 molybdenum Inorganic materials 0.000 claims description 12
- 238000007669 thermal treatment Methods 0.000 claims description 12
- 238000009413 insulation Methods 0.000 claims description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 9
- 239000011574 phosphorus Substances 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 7
- 239000011733 molybdenum Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- 238000005256 carbonitriding Methods 0.000 claims description 5
- 239000010687 lubricating oil Substances 0.000 claims description 5
- 238000010791 quenching Methods 0.000 claims description 5
- 230000000171 quenching Effects 0.000 claims description 5
- 238000002156 mixing Methods 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000005498 polishing Methods 0.000 abstract description 5
- 238000000280 densification Methods 0.000 abstract 1
- 238000011049 filling Methods 0.000 abstract 1
- 238000004806 packaging method and process Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 7
- 230000000875 corresponding Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical class [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 description 1
- 230000003078 antioxidant Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000001808 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 230000003245 working Effects 0.000 description 1
Abstract
The invention relates to a high-strength automobile part powder metallurgy component comprising the chemical composition by the mass percentage: 0.25-0.35% of C, 2.5-3.5% of Ni, 1.7-2.6% of Cu, 0.5-1.0% of Mo, 0.3-0.75% of P, and the balance Fe and unavoidable impurities. A preparation technological process comprises material preparation, mixing, high-temperature pressing, sintering, high-temperature sintering, heat treatment, polishing, finishing, finished product testing, oil filling, and packaging. The composition is redesigned, the pressing sintering technology of the powder metallurgy component is improved, the powder metallurgy component having higher densification is obtained, a correspondingly-manufactured automobile part has large density, and the strength and the surface hardness are both significantly increased.
Description
Technical field
The invention belongs to metal powder metallurgy technical field, be specifically related to a kind of automobile component metallic sintered products with more high strength and preparation method thereof.
Background technology
Powder metallurgy, as new high-tech industry, has played indispensable effect in development of modern industry.Along with the progress and development of science and technology, China's powder metallurgy has made the primary stage of oil bearing from the fifties, towards the mechanical structure parts future development making middle and high intensity.With powder metallurgy process manufacturing machine structural parts, have less, without the characteristic of cutting, again can automatization, production in enormous quantities, so have with powder metallurgy manufacturing machine structural parts, material use efficiency is high, energy consumption is low, low cost and other advantages, and substantially there is no environmental pollution, be generally acknowledged green technology.In decades, China's powder metallurgy technology is advanced by leaps and bounds, and novel material, product innovation continue to bring out.
Automobile clutch disk hub core is the center of clutch coupling, subject continuing or positive and negative twisting instantaneously of mandrel (spline), needs enough intensity, for ensureing work-ing life, also will have certain surface hardness.Current production " Plate hub core " (DK15) material therefor is No. 45 steel, completes it make through forging, machining, thermal treatment, and whole process is because of the shape of its complexity, and mechanical workout intensity is very large, and material deterioration inside is large.Adopt steel to process each base-material heavily about 270 grams, the finished product made nearly weighs 75 grams, 195 grams of metallic scraps of so just having an appointment.And make identical " Plate hub core ", finished product heavily about 70 grams with powder metallurgical technique, use metal-powder about 70.3 grams, the utilization ratio of material is very high, and basic without machining.
Adopt powder metallurgy to make component and also have its weak point, namely it is so high that the density of component product obtained by does not reach DB steel, current powder metallurgy for mechanical structure parts routine makes density between 6.8 ~ 7.0 grams/cc, lower density limits the raising of product intensity, and the density thus improving goods is also the eternal pursuit of powder metallurgy one.So when being faced with the part that " Plate hub core " such high strength requires, obviously cannot meet the requirement improving intensity by existing making method, the intensity improving metal powder metallurgy part is a difficult problem of pendulum in face of those skilled in the art.
Summary of the invention
Technical problem to be solved by this invention provides a kind of high-strength powder metallurgical parts and preparation method thereof for above-mentioned prior art, be particularly suited for as automobile component manufacture, by design alloying constituent, proportioning, improve metallurgical technology to improve the density of metallic sintered products and metallographic structure to reach the object improving metallurgical part intensity.
The present invention's adopted technical scheme that solves the problem is: a kind of high-strength vehicle component metallic sintered products, by mass percentage, its chemical composition is C:0.25 ~ 0.35%, Ni:2.5 ~ 3.5%, Cu:1.7 ~ 2.6%, Mo:0.8 ~ 1.0%, P:0.3 ~ 0.75%, surplus is Fe and inevitable impurity.
The granularity of powder stock is specially: graphite: 300 orders with carefully, nickel powder: 250 orders with carefully, copper powder: 200 orders with carefully, molybdenum powder: 250 orders with carefully, phosphorus powder: 250 orders with carefully, iron powder: be less than 100 orders, be greater than 150 object iron powders, account for 20 ~ 25% of iron powder total mass; Be less than 150 orders, be greater than 200 object iron powders, account for 25 ~ 35% of iron powder total mass; Be less than 200 orders, be greater than 325 object iron powders, account for 25 ~ 35% of iron powder total mass; 325 orders, with thin iron powder, account for 20 ~ 25% of iron powder total mass.
The density of the metallic sintered products finished product corresponding to the present invention is 7.3 ~ 7.4g/cm
3, compared with existing metallic sintered products, quality is finer and close, and density has had and significantly improves, and the intensity of final finished have also been obtained and significantly improves.
The main ingredient of metallic sintered products of the present invention is determined like this:
Nickel: while the intensity improving material and hardness, obviously can improve the impelling strength of material, make material obtain good comprehensive mechanical property, and material can be made to have good hardening capacity and wear resistance.
Copper: in the material except there being good solution strengthening effect, can also play the effect of activated sintering, is therefore conducive to the density and the intensity that improve material.Anticorrosive, the antioxidant property of material can be improved in addition.Shrinkage strain during part sintering can also be reduced, be conducive to the geometric accuracy improving part.
Phosphorus: the atomic radius of phosphorus is 0.077nm, can form interval type sosoloid with iron, the lattice distortion that interval type sosoloid causes can be high, and the effect therefore strengthened is very remarkable.Comprehensive, phosphorus can play the effect of solution strengthening, hole nodularization and activated sintering in the material, material can be made to obtain higher intensity and density, and impelling strength is improved.
Molybdenum: the effect having very strong crystal grain thinning, to improving the intensity of material, hardening capacity, red hardness have effect clearly, and effectively can reduce temper brittleness.Good comprehensive mechanical property can be obtained during material heat treatment.
Another object of the present invention is to provide the preparation method of above-mentioned high-strength vehicle component metallic sintered products, and technical process is batching-mixing-compacting-sintering-high temperature sintering-thermal treatment-polishing-light decorations-finished product detection-oil-filled-packing, wherein,
Mixing is that the powder material prepared is fed into mixing machine, fully mixes;
Compacting be mould and powder all heat remain on 100 DEG C ± 10 DEG C temperature under carry out, pressing process: pressure: 1000KN ~ 1600KN, compared with traditional pressing methods, high temperature compacting significantly improves the density of pressed compact;
Sintering process: sintering temperature: 1120 DEG C ± 5 DEG C, sintering time: 5 ~ 8h, normally sinters pressed compact;
High-sintering process: carry out high temperature sintering again after normally being sintered by pressed compact, high temperature sintering temperature: 1280 DEG C ± 5 DEG C, the high temperature sintering time: 5 ~ 10h, the abundant alloying of nickel now in blank, molybdenum element, the performance of element is not fully exerted, and in addition, high temperature sintering can make the size of product shrink on a small quantity, density is improved, reaches 7.40g/cm
3;
Thermal treatment: by workpiece heat to 900 ± 15 DEG C, insulation 70 ± 10min, oil quenching; Tempering subsequently, tempering Heating temperature 250 ± 10 DEG C, tempering insulation time 90 ± 10min, by carbonitriding thermal treatment, improves superficial hardness number HRC25 ~ 30 of product;
Polishing: remove product burr;
Light is adornd: improve product surface glossiness;
Oil-filled: under negative pressure state, in product, to be filled with the lubricating oil accounting for metallic sintered products 4% volume ratio, improve product wear resistance in use.
Compared with prior art, the invention has the advantages that: the present invention, by redesigning the elemental composition of metallic sintered products, improves the density of metallic sintered products, improves intensity and surface hardness.Further, bulk alloy element can improve except the density of material, intensity, the comprehensive mechanical property such as hardness and impelling strength more except possessing, key is some defect that the combination of these elements can also overcome himself mutually, as being mixed in the fine nickel powder in iron powder and Graphite Powder 99 powder mix, can not fully spread during usual sintering, but copper powder and adding of phosphorus powder can make this defect improve.In high-temperature sintering process, make element alloyed, metallographic structure is more mature and stable developmentally.
Compared with existing metallic sintered products, the present invention has redesigned composition, improves the compacting sintering technique of metallic sintered products, obtains the metallic sintered products that a kind of compactness is higher, the corresponding automobile component density manufactured is large, and intensity and surface hardness all obtain to be increased significantly.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment 1
High-strength vehicle component " Plate hub core " metallic sintered products in the present embodiment, by mass percentage, its chemical composition is C:0.3%, Ni:3%, Cu:2%, Mo:0.5%, P:0.5%, and surplus is Fe and inevitable impurity.
Raw material corresponding to elementary composition comprises graphite: 300 orders with carefully, nickel powder: 250 orders with carefully, copper powder: 200 orders are with carefully, molybdenum powder: 250 orders are with carefully, phosphorus powder: 250 orders with carefully, iron powder: be less than 100 orders, be greater than 150 object iron powders, account for 20 ~ 25% of iron powder total mass; Be less than 150 orders, be greater than 200 object iron powders, account for 25 ~ 35% of iron powder total mass; Be less than 200 orders, be greater than 325 object iron powders, account for 25 ~ 35% of iron powder total mass; 325 orders, with thin iron powder, account for 20 ~ 25% of iron powder total mass.
The preparation method of above-mentioned high strength Plate hub core metallic sintered products, technical process is batching-mixing-compacting-sintering-high temperature sintering-thermal treatment-polishing-light decorations-finished product detection-oil-filled-packing, wherein,
Mixing is that the powder material prepared is fed into mixing machine, fully mixes;
Compacting be mould and powder all heat remain on 100 DEG C ± 10 DEG C temperature under carry out, pressing process: pressure: 1000KN ~ 1600KN, high temperature compacting significantly improves density to the 7.30 ~ 7.40g/cm of pressed compact
3;
Sintering process: sintering temperature: 1120 DEG C ± 5 DEG C, sintering time: 5h, normally sinters pressed compact;
High-sintering process: carry out high temperature sintering again after normally being sintered by pressed compact, high temperature sintering temperature: 1280 DEG C ± 5 DEG C, the high temperature sintering time: 5h, blank density reaches 7.40g/cm
3;
Thermal treatment: by blank heating to 900 DEG C, insulation 70min, oil quenching; Tempering subsequently, tempering Heating temperature 250 DEG C, tempering insulation time 90min, by carbonitriding thermal treatment, improves superficial hardness number HRC25 ~ 30 of product;
Polishing: remove product burr;
Light is adornd: improve product surface glossiness;
Finished product detection: the size of testing product, mechanical property;
Oil-filled: under negative pressure state, in product, to be filled with the lubricating oil accounting for metallic sintered products 4% volume ratio, improve product wear resistance in use.
Packing.
Embodiment 2
High-strength vehicle component " Plate hub core " metallic sintered products in the present embodiment, by mass percentage, its chemical composition is C:0.32%, Ni:2.8%, Cu:2.4%, Mo:0.8%, P:0.65%, and surplus is Fe and inevitable impurity.
Raw material corresponding to elementary composition comprises graphite: 300 orders with carefully, nickel powder: 250 orders with carefully, copper powder: 200 orders are with carefully, molybdenum powder: 250 orders are with carefully, phosphorus powder: 250 orders with carefully, iron powder: be less than 100 orders, be greater than 150 object iron powders, account for 20 ~ 25% of iron powder total mass; Be less than 150 orders, be greater than 200 object iron powders, account for 25 ~ 35% of iron powder total mass; Be less than 200 orders, be greater than 325 object iron powders, account for 25 ~ 35% of iron powder total mass; 325 orders, with thin iron powder, account for 20 ~ 25% of iron powder total mass.
The preparation method of above-mentioned high strength Plate hub core metallic sintered products, technical process is batching-mixing-compacting-sintering-high temperature sintering-thermal treatment-polishing-light decorations-finished product detection-oil-filled-packing, wherein,
Mixing is that the powder material prepared is fed into mixing machine, fully mixes;
Compacting be mould and powder all heat remain on 100 DEG C ± 10 DEG C temperature under carry out, pressing process: pressure: 1000KN ~ 1600KN, high temperature compacting significantly improves density to the 7.20 ~ 7.30g/cm of pressed compact
3;
Sintering process: sintering temperature: 1120 DEG C ± 5 DEG C, sintering time: 5h, normally sinters pressed compact;
High-sintering process: carry out high temperature sintering again after normally being sintered by pressed compact, high temperature sintering temperature: 1280 DEG C ± 6 DEG C, the high temperature sintering time: 5h, blank density reaches 7.30 ~ 7.40g/cm
3;
Thermal treatment: by blank heating to 900 DEG C, insulation 70min, oil quenching; Tempering subsequently, tempering Heating temperature 250 DEG C, tempering insulation time 90min, by carbonitriding thermal treatment, improves superficial hardness number HRC25 ~ 30 of product;
Polishing: remove product burr;
Light is adornd: improve product surface glossiness;
Finished product detection: the size of testing product, mechanical property;
Oil-filled: under negative pressure state, in product, to be filled with the lubricating oil accounting for metallic sintered products 4% volume ratio, improve product wear resistance in use.
Packing.
Embodiment 3
High-strength vehicle component " Plate hub core " metallic sintered products in the present embodiment, by mass percentage, its chemical composition is C:0.28%, Ni:2.5%, Cu:1.8%, Mo:0.5%, P:0.35%, and surplus is Fe and inevitable impurity.
Raw material corresponding to elementary composition comprises graphite: 300 orders with carefully, nickel powder: 250 orders with carefully, copper powder: 200 orders are with carefully, molybdenum powder: 250 orders are with carefully, phosphorus powder: 250 orders with carefully, iron powder: be less than 100 orders, be greater than 150 object iron powders, account for 20 ~ 25% of iron powder total mass; Be less than 150 orders, be greater than 200 object iron powders, account for 25 ~ 35% of iron powder total mass; Little with 200 orders, be greater than 325 object iron powders, account for 25 ~ 35% of iron powder total mass; 325 orders, with thin iron powder, account for 20 ~ 25% of iron powder total mass.
The preparation method of above-mentioned high strength Plate hub core metallic sintered products, technical process is batching-mixing-compacting-sintering-high temperature sintering-thermal treatment-polishing-light decorations-finished product detection-oil-filled-packing, wherein,
Mixing is that the powder material prepared is fed into mixing machine, fully mixes;
Compacting be mould and powder all heat remain on 100 DEG C ± 10 DEG C temperature under carry out, pressing process: pressure: 1000KN ~ 1600KN, high temperature compacting significantly improves density to the 7.20 ~ 7.30g/cm of pressed compact
3;
Sintering process: sintering temperature: 1120 DEG C ± 5 DEG C, sintering time: 5h, normally sinters pressed compact;
High-sintering process: carry out high temperature sintering again after normally being sintered by pressed compact, high temperature sintering temperature: 1280 DEG C ± 5 DEG C, the high temperature sintering time: 5h, blank density reaches 7.30 ~ 7.40g/cm
3;
Thermal treatment: by blank heating to 900 DEG C, insulation 70min, oil quenching; Tempering subsequently, tempering Heating temperature 250 DEG C, tempering insulation time 90min, by carbonitriding thermal treatment, improves superficial hardness number HRC25 ~ 30 of product;
Polishing: remove product burr;
Light is adornd: improve product surface glossiness;
Finished product detection: the size of testing product, mechanical property;
Oil-filled: under negative pressure state, in product, to be filled with the lubricating oil accounting for metallic sintered products 4% volume ratio, improve product wear resistance in use.
Packing.
Claims (5)
1. a high-strength vehicle component metallic sintered products, is characterized in that: by mass percentage, and its chemical composition is C:0.25 ~ 0.35%, Ni:2.5 ~ 3.5%, Cu:1.7 ~ 2.6%, Mo:0.5 ~ 1.0%, P:0.3 ~ 0.75%, surplus is Fe and inevitable impurity.
2. high-strength vehicle component metallic sintered products according to claim 1, it is characterized in that: powder stock comprises: graphite: 300 orders are with carefully, nickel powder: 250 orders are with carefully, copper powder: 200 orders are with carefully, molybdenum powder: 250 orders are with carefully, phosphorus powder: 250 orders with carefully, iron powder: be less than 100 orders, be greater than 150 object iron powders, account for 20 ~ 25% of iron powder total mass; Be less than 150 orders, be greater than 200 object iron powders, account for 25 ~ 35% of iron powder total mass; Be less than 200 orders, be greater than 325 object iron powders, account for 25 ~ 35% of iron powder total mass; 325 orders, with thin iron powder, account for 20 ~ 25% of iron powder total mass.
3. high-strength vehicle component metallic sintered products according to claim 1, is characterized in that: the density of finished product is 7.3 ~ 7.4g/cm
3.
4. prepare the method for high-strength vehicle component metallic sintered products described in claim 1 or 2 or 3 for one kind, it is characterized in that: technical process is batching-mixing-compacting-sintering-high temperature sintering-thermal treatment-polishing-light decorations-finished product detection-oil-filled-packing, wherein
Compacting carries out under mould and powder all remain on the temperature of 100 DEG C ± 10 DEG C, pressing process: pressure: 1000KN ~ 1600KN;
Sintering process: pressed compact is normally sintered, sintering temperature: 1120 DEG C ± 5 DEG C, sintering time: 5 ~ 8h;
High-sintering process: carry out high temperature sintering again after normally being sintered by pressed compact, high temperature sintering temperature: 1280 DEG C ± 5 DEG C, high temperature sintering time: 5 ~ 10h;
Thermal treatment: adopt carbonitriding thermal treatment process, by blank heating to 900 ± 15 DEG C, insulation 70 ± 10min, oil quenching; Tempering subsequently, tempering Heating temperature 250 ± 10 DEG C, tempering insulation time 90 ± 10min;
Oil-filled: under negative pressure state, in product, to be filled with the lubricating oil accounting for metallic sintered products 4% volume ratio.
5. the preparation method of high-strength vehicle component metallic sintered products according to claim 4, it is characterized in that: after described thermal treatment, the surface hardness of material reaches HRC25 ~ 30.
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Cited By (7)
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| CN106222522A (en) * | 2016-08-31 | 2016-12-14 | 成都威士达粉末冶金有限公司 | A kind of powder metallurgical composition manufacturing motor housing, and the method manufacturing motor housing |
| CN107761003A (en) * | 2017-09-20 | 2018-03-06 | 上海汽车粉末冶金有限公司 | The powder metallurgy sintered method of bearing cap |
| CN108679136A (en) * | 2018-05-18 | 2018-10-19 | 宁波市奇强精密冲件有限公司 | Spring plate of shock absorber |
| CN108977735A (en) * | 2018-08-24 | 2018-12-11 | 无锡联信离合器有限公司 | New-energy automobile clutch powder metallurgy hub and preparation method thereof |
| CN110947952A (en) * | 2019-12-17 | 2020-04-03 | 马鞍山市华东粉末冶金厂 | Transmission eccentric block for light electric pruning shears and manufacturing method thereof |
| CN111408715A (en) * | 2020-04-09 | 2020-07-14 | 山东威达粉末冶金有限公司 | Method for improving sintering density of iron-based copper-containing powder metallurgy sintered part |
| CN111843396A (en) * | 2020-08-03 | 2020-10-30 | 宁波瑞丰汽车零部件有限公司 | Technological method for one-time finished product of locking pawl of automobile safety belt |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106222522A (en) * | 2016-08-31 | 2016-12-14 | 成都威士达粉末冶金有限公司 | A kind of powder metallurgical composition manufacturing motor housing, and the method manufacturing motor housing |
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| CN108679136A (en) * | 2018-05-18 | 2018-10-19 | 宁波市奇强精密冲件有限公司 | Spring plate of shock absorber |
| CN108977735A (en) * | 2018-08-24 | 2018-12-11 | 无锡联信离合器有限公司 | New-energy automobile clutch powder metallurgy hub and preparation method thereof |
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| CN110947952B (en) * | 2019-12-17 | 2022-02-11 | 马鞍山市华东粉末冶金厂 | Transmission eccentric block for light electric pruning shears and manufacturing method thereof |
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