CN102888562B - Damper compression valve and preparation method thereof - Google Patents
Damper compression valve and preparation method thereof Download PDFInfo
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- CN102888562B CN102888562B CN201210415188.7A CN201210415188A CN102888562B CN 102888562 B CN102888562 B CN 102888562B CN 201210415188 A CN201210415188 A CN 201210415188A CN 102888562 B CN102888562 B CN 102888562B
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Abstract
The invention provides a damper compression valve, belongs to the field of automobile parts, and is used for solving the problem that the existing damper compression valve is low in density. The damper compression valve provided by the invention comprises the following components in parts by weight: 50-80 parts of reduced iron powder, 7.5-10 parts of electrolytic copper powder, 0.2-0.5 part of colloidal graphite, 0.25-0.35 part of lubricant and 0.25-0.35 part of manganese sulfide. The invention also provides a preparation method of the damper compression valve. Through rationally selecting the ingredients for preparing the damper compression valve and utilizing a powder metallurgy method, the cost is reduced, the density of a product is improved, the size tolerance of the product is lessened, and the hardness of the product is improved. Furthermore, the size tolerance of the product is further lessened through reshaping; and the density of the product is further improved through water atomizing steam treatment, and the density of the damper compression valve can reach up to 7.32-7.5g/cm<3>.
Description
Technical field
The present invention relates to field of powder metallurgy, relate in particular to a kind of shock absorber compression valve and preparation method thereof.
Background technology
Vibroshock is all installed in automobile suspension system conventionally, and vibroshock can make automobile reduce in the process of moving the fluctuation while travelling, and the damping, buffering effect by vibroshock reaches and improves comfortableness by bus and the object of security.The structure of vibroshock is that the piston rod with piston is inserted in cylinder, in cylinder, is full of oil.Piston moves in cylinder, and piston rod need to ceaselessly enter or extract out in cylinder along with thump.Piston is provided with throttle orifice, and the oil in two portions space that makes to be separated by piston can supplement mutually.The outlet of throttle orifice is provided with compression valve, and this compression valve is according to the increase of oil pressure and reduce to change its open/close states.
Because shock absorber compression valve needs repeatedly back and forth movement, therefore need to there is good product density, shock absorber compression valve is to be soaked in oil simultaneously, therefore also needs good air tightness.Existing shock absorber compression valve is to utilize copper material or cutting rolled steel, punch process to form.This complete processing time is long, expense is higher, poor dimensional stability and waste of raw materials more.
Summary of the invention
The object of the present invention is to provide the shock absorber compression valve that a kind of product density is high, resistance to air loss is good.
Another object of the present invention is to provide the preparation method of the shock absorber compression valve that reduces manufacturing cost, improves the quality of products.
The technical solution used in the present invention is, proposes a kind of shock absorber compression valve, and the component of this shock absorber compression valve and parts by weight are:
Reduced iron powder: 50-80 part;
Electrolytic copper powder: 7.5-10 part;
Oildag: 0.2-0.5 part;
Lubricant: 0.25-0.35 part;
Manganese sulfide: 0.25-0.35 part.
Iron powder, copper powder and graphite are raw materials conventional in powder metallurgy process.Triplicity can be prepared the good powder metallurgy workpieces of mechanical property.This is mainly because copper powder is more soft than iron powder, has better plasticity, and copper powder and iron powder can have good compactibility in pressing process, and copper powder has certain solubleness in iron powder, after interpolation copper powder, has solution strengthening effect.And graphite and iron powder can form this high rigidity phase of cementite, to improving the mechanical property of final workpiece, there is good effect.
The increase of copper powder content can directly improve the bending strength of product, but, because its plasticity is poor, can reduce the Rockwell hardness of product; The increase of content of graphite is contrary with copper powder on the impact of product mechanical property, its Rockwell hardness that can significantly increase product but reduces bending strength, the present invention, by the proportioning of reasonable disposition copper powder and graphite, remains on compared with equilibrium state the Rockwell hardness of product and bending strength.
In addition, the content of copper powder also can affect the density of product, this is because copper is different from the scattering nature of iron, the diffusion of the diffusion ratio iron of copper in iron in copper is fast, copper dissolution forms substitutional solid solution in iron, the volume of substitutional solid solution is larger, and therefore the increase along with copper content also can make the volume of product increase, and product density reduces.When selecting copper powder content, need consider proportioning impact on product density on the impact of product mechanical property and copper powder of copper powder, graphite.
Oildag is to be dispersed in organic solvent and to form by particle diameter being less than to the graphite granule of 4 microns, and the content of graphite granule is generally the 27%-35% of whole colloidal content.Oildag not only has the various types of properties of conventional graphite, also has good lubricity, good heat conductivility.The present invention adopts oildag to replace the common graphite using in prior powder metallurgy process, can reduce the use of lubricant in compression moulding process, in sintering process, can improve the yield of sinter molding.
Common powder metallurgical technique adopts straight iron powder or atomized iron powder conventionally, iron powder needs first to carry out powder reduction step in powder metallurgy process, the present invention directly selects reduced iron powder, has saved the powder reduction step of conventional powder metallurgy process, has improved working efficiency.
Lubricant mainly plays and reduces between powder and mould and the frictional force between powder and powder, makes in powder compaction process, and transmission of pressure better, strengthens the filling properties of powder particle.The parts by weight of lubricant select with product pressing process in pressure closely related, and product is suppressed the shaping press of common employing standard, therefore by determining that the compacting tonnage of product shaping press can obtain the parts by weight of lubricant.In the present invention, because oildag can be taken into account the effect of lubricant, so when selecting the parts by weight of other lubricants, need to deduct the parts by weight of oildag.
In the present invention, lubricant is preferably Zinic stearas, paraffin or tetrafluoroethylene.
The raw material of shock absorber compression valve of the present invention is also chosen the manganese sulfide that has 0.25-0.35 weight fraction in choosing.Manganese sulfide, in powder metallurgy process, adds usually used as cutting agent, for improving the cutting ability of product, even has experiment to show, when manganese sulfide content is lower, also can reduce product density.Yet the present invention found through experiments, when the content of manganese sulfide rises to certain proportion, because manganese sulfide is more crisp, plasticity-is fine, a certain proportion of manganese sulfide can be scattered in preferably iron powder surface when compacting, makes iron powder under relatively low pressure and temperature, from solid, to change liquid into, can bring into play to greatest extent the compressibility of metal-powder, thereby improve the density of product, the content of manganese sulfide also can not exert an influence to the hardness of product and dimensional precision simultaneously.Yet during the too high levels of manganese sulfide, but can reduce the erosion resistance of product, reduce product life.The weight ratio of the manganese sulfide that the present invention chooses has been broken the conventional interpolation manganese sulfide of thinking can reduce the prejudice of product density, and can take into account and reduce its detrimentally affect to product life.
Preferably, reduced iron powder particle diameter is 100-150 order, and electrolytic copper powder particle diameter is 180-250 order.
In the preferred embodiment for the present invention, reduced iron powder particle diameter is different from electrolytic copper powder particle diameter, thereby making small particle powder to mix the gap making between macrobead powder with macrobead powder is occupied by small particle powder, to improve the loose density of powder, while making product compression moulding, the density of product and intensity all increase.
Another technical scheme that the present invention adopts is, proposes a kind of preparation method of above-mentioned shock absorber compression valve, and it comprises step:
S1: batching is mixed;
S2: compacting: compacting tonnage is 30-50 ton;
S3: sintering: 600 ℃ to 700 ℃ of calcined temperatures, 30 minutes to 40 minutes pre-burning time; Sintering temperature is 1200 ℃ to 1500 ℃, sintering time 3 to 4 hours; During sintering, be filled with 30 to 40 cubic metres of shielding gas.
During press forming, pressing pressure fundamental sum the finished product density is directly proportional.When pressure has just started to increase, the arch bridge in body of powder is broken soon, powder particle is subjected to displacement fills space each other, and rearranging position increases contact, and product density sharply increases.Pressure sharply increases to after the emergent pressure over powder particle, and powder particle starts distortion, and product density continues to increase.Pressure surpasses after powder emergent pressure, continues to improve pressure product density improved effect is reduced.For cost-saving, save equipment acquisition expense use, the compacting tonnage that the present invention chooses is 30-50 ton.
In sintering process, the main purpose of pre-burning is the lubricant while removing step S1 and S2.When sintering temperature rises, sintering neck expands, and grain spacing reduces, and forms continuous space grid, and sintered compact shrinks to be separated, to improve product density and can improve intensity.When sintering temperature is too high, product grains too increases, and sintering space is distorted completely, causes deformation of products and cracking, undesirable.
In sintering process, be filled with shielding gas, prevent from, in sintering process, redox reaction occurs, reduce product performance.
Preferably, in step S1, after the reduced iron powder of first choosing half weight part mixes with electrolytic copper powder, oildag, lubricant and manganese sulfide, again add the reduced iron powder of second half weight part, again mix.
Preferably, also comprise shaping step, shaping pressure is 80-90 ton.By secondary, suppress shaping to improve Product Precision, reduce tolerance of dimension.
Preferably, also comprise water vapour atomization treatment step: it is that the water vapour of 400-500 ℃ heats 5 hours that product is put into temperature, makes product surface form the protective membrane of 0.005mm to 0.006mm.
Water vapour atomization is processed can form Z 250 protective membrane at product surface, can improve wear resistance and the high pressure compactness of product, makes product have certain rust-proof effect.The present invention is owing to having selected the good oildag of heat conductivility in raw material, therefore in water vapour atomization treatment step, in the more conventional water vapour atomization treatment step of needed steam temperature, required steam temperature is low, therefore can reduce the production cost in this step.
The present invention prepares the batching of shock absorber compression valve by Rational choice, and utilizes powder metallurgy process preparation, can reduce costs, and improves product density, and shorten product sizes tolerance, improves product hardness.Further, the present invention, by utilizing shaping further to reduce product size tolerance, further improves product density by water atomization steam treatment, makes the product density of shock absorber compression valve of the present invention can reach 7.32-7.5g/cm
3.
Embodiment
Be below specific embodiments of the invention, technical scheme of the present invention is further described, but the present invention is not limited to these embodiment.
Embodiment 1
The present embodiment is prepared shock absorber compression valve in the following way:
(1) batching
Choosing median size is that 100 object reduced iron powder 40 weight parts, median size are 250 object electrolytic copper powder 7.5 weight parts, oildag 0.5 weight part, Zinic stearas 0.35 weight part, manganese sulfide 0.25 weight part, puts into the mixed powder machine of taper and fully mixes; To adding median size in the mixed powder machine of taper, be then 100 object reduced iron powder 40 weight parts again.Mixing time 30 minutes, reaches abundant mixed effect.
(2) compacting
It is that the automatic molder of 50 tons is suppressed that the powder mixing is put into compacting tonnage.
(3) sintering
In meshbeltfurnace, carry out sintering step; 600 ℃ of calcined temperatures, 30 minutes pre-burning time; 1200 ℃ of sintering temperatures, sintering time 3 hours.Meshbeltfurnace is in sintering process, and the flow of combustion gases hydrogen is 20 cubic metres, and the flow of shielding gas helium is 40 cubic metres.
(4) shaping
Adopt 80 tons of trimmer Shape corrections.
After the product obtaining, test its density, tolerance of dimension, Rockwell hardness, crushing force radially, the test result obtaining is in Table one.
Wherein, Rockwell hardness adopts Rockwell hardometer test, and density adopts drainage (GB/T5163-1985) test, and tolerance of dimension and radially crushing force adopt conventional universl tester.
Embodiment 2
(1) batching
Choosing median size is that 130 object reduced iron powder 50 weight parts, median size are 200 object electrolytic copper powder 10 weight parts, oildag 0.2 weight part, paraffin 0.25 weight part, manganese sulfide 0.25 weight part, puts into the mixed powder machine of taper and fully mixes.
(2) compacting
It is that the automatic molder of 30 tons is suppressed that the powder mixing is put into compacting tonnage.
(3) sintering
In meshbeltfurnace, carry out sintering step; 700 ℃ of calcined temperatures, 40 minutes pre-burning time; 1450 ℃ of sintering temperatures, sintering time 3 hours.Meshbeltfurnace is in sintering process, and the flow of combustion gases hydrogen is 30 cubic metres, and the flow of shielding gas helium is 30 cubic metres.
(4) steam atomization is processed
It is that the water vapour of 400 ℃ heats 5 hours that product after sintering is put into temperature, makes product surface form the protective membrane of 0.005mm to 0.006mm.
After the product obtaining, test its density, tolerance of dimension, Rockwell hardness, crushing force radially, the test result obtaining is in Table one.
Wherein, Rockwell hardness adopts Rockwell hardometer test, and density adopts drainage (GB/T5163-1985) test, and tolerance of dimension and radially crushing force adopt conventional universl tester.
Embodiment 3
One) batching
Choosing median size is that 100 object reduced iron powder 60 weight parts, median size are 180 object electrolytic copper powder 8 weight parts, oildag 0.3 weight part, PVC emulsifying liquid 0.3 weight part, manganese sulfide 0.3 weight part, puts into the mixed powder machine of taper and fully mixes.
(2) compacting
It is that the automatic molder of 50 tons is suppressed that the powder mixing is put into compacting tonnage.
(3) sintering
In meshbeltfurnace, carry out sintering step; 650 ℃ of calcined temperatures, 35 minutes pre-burning time; 1500 ℃ of sintering temperatures, sintering time 4 hours.Meshbeltfurnace is in sintering process, and the flow of combustion gases hydrogen is 30 cubic metres, and the flow of shielding gas helium is 40 cubic metres.
(4) shaping
Adopt 90 tons of trimmer Shape corrections.
(5) steam atomization is processed
It is that the water vapour of 500 ℃ heats 5 hours that product after shaping is put into temperature, makes product surface form the protective membrane of 0.005mm to 0.006mm.
After the product obtaining, test its density, tolerance of dimension, Rockwell hardness, crushing force radially, the test result obtaining is in Table one.
Wherein, Rockwell hardness adopts Rockwell hardometer test, and density adopts drainage (GB/T5163-1985) test, and tolerance of dimension and radially crushing force adopt conventional universl tester.
Table one
As seen from the above table, shock absorber compression valve of the present invention meets product demand, and its cost is only half left and right of conventional copper, steel part, has expanded the range of application of powder metallurgy product.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (4)
1. a shock absorber compression valve, it is characterized in that: the component of this shock absorber compression valve and parts by weight are: reduced iron powder: 50-80 part, electrolytic copper powder: 7.5-10 part, oildag: 0.2-0.5 part, lubricant: 0.25-0.35 part, manganese sulfide: 0.25-0.35 part;
The preparation method of this shock absorber compression valve comprises the following steps:
S1: batching is mixed;
S2: compacting: compacting tonnage is 30-50 ton;
S3: sintering: 600 ℃ to 700 ℃ of calcined temperatures, 30 minutes to 40 minutes pre-burning time; Sintering temperature is 1200 ℃ to 1500 ℃, sintering time 3 to 4 hours; During sintering, be filled with 30 to 40 cubic metres of shielding gas;
S4: shaping: shaping pressure is 80-90 ton;
S5: water vapour atomization is processed: it is that the water vapour of 400-500 ℃ heats 5 hours that product is put into temperature, makes product surface form the protective membrane of 0.005mm to 0.006mm.
2. shock absorber compression valve as claimed in claim 1, is characterized in that: described lubricant is Zinic stearas, paraffin or tetrafluoroethylene.
3. shock absorber compression valve as claimed in claim 1, is characterized in that: described reduced iron powder particle diameter is 100-150 order, and electrolytic copper powder particle diameter is 180-250 order.
4. shock absorber compression valve as claimed in claim 1, it is characterized in that: in step S1, after the reduced iron powder of first choosing half weight part mixes with electrolytic copper powder, oildag, lubricant and manganese sulfide, again add the reduced iron powder of second half weight part, again mix.
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| CN102888562B true CN102888562B (en) | 2014-12-10 |
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| CN107470633B (en) * | 2017-07-27 | 2019-10-11 | 宁波金钟粉末冶金有限公司 | A kind of damper valve seat |
| CN107470632B (en) * | 2017-07-27 | 2019-07-26 | 宁波金钟粉末冶金有限公司 | A kind of guider of shock absorber |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1768985A (en) * | 2004-09-27 | 2006-05-10 | 杰富意钢铁株式会社 | Iron-based mixed powder for powder metallurgy and sintered body |
| CN101269416A (en) * | 2008-05-09 | 2008-09-24 | 徐信国 | Powder metallurgy member for piston supporting base of power cylinder and method for manufacturing same |
| CN101638819A (en) * | 2009-09-01 | 2010-02-03 | 重庆市江北区利峰工业制造有限公司 | Powder metallurgy bolster and production technology thereof |
| CN101708549A (en) * | 2009-11-27 | 2010-05-19 | 安徽省芜湖市信达粉末冶金零部件有限公司 | Powder metallurgy technical formula and technical process thereof |
| CN101983832A (en) * | 2010-11-09 | 2011-03-09 | 宁波宁江粉末冶金有限公司 | Manufacturing process of hair clipper blade |
| CN102443739A (en) * | 2010-09-30 | 2012-05-09 | 日立粉末冶金株式会社 | Sintered material for valve guides and production methods therefor |
| CN102443737A (en) * | 2010-09-30 | 2012-05-09 | 日立粉末冶金株式会社 | Sintered material for valve guides and production method therefor |
| CN102443738A (en) * | 2010-09-30 | 2012-05-09 | 日立粉末冶金株式会社 | Sintered material for valve guides and production method therefor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5938355A (en) * | 1982-08-25 | 1984-03-02 | Toyota Motor Corp | Iron-base sintered body |
-
2012
- 2012-10-17 CN CN201210415188.7A patent/CN102888562B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1768985A (en) * | 2004-09-27 | 2006-05-10 | 杰富意钢铁株式会社 | Iron-based mixed powder for powder metallurgy and sintered body |
| CN101269416A (en) * | 2008-05-09 | 2008-09-24 | 徐信国 | Powder metallurgy member for piston supporting base of power cylinder and method for manufacturing same |
| CN101638819A (en) * | 2009-09-01 | 2010-02-03 | 重庆市江北区利峰工业制造有限公司 | Powder metallurgy bolster and production technology thereof |
| CN101708549A (en) * | 2009-11-27 | 2010-05-19 | 安徽省芜湖市信达粉末冶金零部件有限公司 | Powder metallurgy technical formula and technical process thereof |
| CN102443739A (en) * | 2010-09-30 | 2012-05-09 | 日立粉末冶金株式会社 | Sintered material for valve guides and production methods therefor |
| CN102443737A (en) * | 2010-09-30 | 2012-05-09 | 日立粉末冶金株式会社 | Sintered material for valve guides and production method therefor |
| CN102443738A (en) * | 2010-09-30 | 2012-05-09 | 日立粉末冶金株式会社 | Sintered material for valve guides and production method therefor |
| CN101983832A (en) * | 2010-11-09 | 2011-03-09 | 宁波宁江粉末冶金有限公司 | Manufacturing process of hair clipper blade |
Non-Patent Citations (1)
| Title |
|---|
| JP昭59-38355A 1984.03.02 * |
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