CN107520451A - A kind of shock absorber piston and its preparation technology - Google Patents
A kind of shock absorber piston and its preparation technology Download PDFInfo
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- CN107520451A CN107520451A CN201710652597.1A CN201710652597A CN107520451A CN 107520451 A CN107520451 A CN 107520451A CN 201710652597 A CN201710652597 A CN 201710652597A CN 107520451 A CN107520451 A CN 107520451A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/04—Alloys containing less than 50% by weight of each constituent containing tin or lead
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0005—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with at least one oxide and at least one of carbides, nitrides, borides or silicides as the main non-metallic constituents
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0207—Using a mixture of prealloyed powders or a master alloy
- C22C33/0221—Using a mixture of prealloyed powders or a master alloy comprising S or a sulfur compound
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0207—Using a mixture of prealloyed powders or a master alloy
- C22C33/0228—Using a mixture of prealloyed powders or a master alloy comprising other non-metallic compounds or more than 5% of graphite
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
- C22C33/0292—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with more than 5% preformed carbides, nitrides or borides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/241—Chemical after-treatment on the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a kind of shock absorber piston and preparation method thereof, belong to powder metallurgical technology.Shock absorber piston material composition and percentage composition are：Tin bronze powder 36% 45%, carbon dust 0.5% 1.3%, manganese sulfide 0.5% 1.0%, ceria 0.2% 0.3%, boron carbide 3% 6%, surplus are iron powder.Tin bronze powder and the ratio of iron powder are close to 1 in the raw material proportioning:1, it is iron copper-base powder metallurgy, possesses the advantages of ferrous based powder metallurgical and copper-base powder metallurgy, while boron carbide increase product coefficient of friction is added, ceria crystal grain thinning is added, improves crushing strength, hardness, antifriction and the wearability of material.Most afterwards through it is once sintered be molded and carry out surface treatment obtain finished product.
Description
Technical field
The present invention relates to a kind of shock absorber piston, and in particular to a kind of powder metallurgy shock absorber piston and its preparation technology,
Belong to powder metallurgical technology.
Background technology
Piston plays very big effect in the car as accessory essential in automobile.Lead in automobile suspension system
Often it is fitted with damper, and the component that piston is essential as damper, reciprocal fortune is ceaselessly done in damper cylinder barrel
It is dynamic, control the flow of the inside to open and close.Frequently move back and forth and just inevitably require that piston has high abrasion, it is highly dense
The features such as spending.The powder metallurgy technology ripe as one, provides great help in the making of auto-parts.
Powder metallurgy is to produce metal dust or made with metal dust (or mixture of metal dust and non-metal powder)
For raw material, by shaping and sintering, the technology of manufacture metal material, composite and all kinds product.Powder smelting
Gold includes powder processed and product.Powder wherein processed is mainly metallurgical process, and literal identical.And sintered metal product then often far beyond
Material and metallurgical category, often across the technology of multidisciplinary (material and metallurgy, machinery and mechanics etc.).Especially contemporary metal powder
Last 3D printing, collection mechanical engineering, CAD, reverse Engineering Technology, Layered Manufacturing Technology, Numeric Control Technology, material science, laser technology
So that sintered metal product technology turns into across more multi-disciplinary modern complex art.
And traditional auto absorber piston is molded using zinc alloy diecasting, machining turning, purged and packed finished product, lack
Point is due to that the tolerance grade of die casting is extremely difficult to technical requirements, must machining come ensure the concentricity of product, perpendicularity and
The sealing ring size of piston external diameter.Traditional manufacture craft not only complex procedures, labor intensive and the energy, and often do not reach
Product standard demand.Meanwhile the screw thread for connecting the screw of piston and connecting rod also easily produces loosening in long-term reciprocating motion,
Potential safety hazard be present, security incident occurs for serious meeting.
It is low for traditional kirsite shock absorber piston hardness, it is not wear-resisting the shortcomings of, Chinese patent
(ZL201210415179.8) disclose one kind and piston lever of reducer is made using ferrous based powder metallurgical method, improve product gas
Density and product density.However, ferrous based powder metallurgical can not solve shock absorber piston hardness, wearability and crushing strength very well
The problems such as.
The content of the invention
For above-mentioned problem, the present invention provides a kind of high abrasion, high rigidity, the shock absorber piston of high intensity.
To achieve these goals, the present invention uses following technical scheme：
A kind of powder metallurgy piston for damper, described piston for damper is by following composition and its mass percent group
Into：Tin bronze powder 36%-45%, carbon dust 0.5%-1.3%, manganese sulfide 0.5%-1.0%, ceria 0.2%-0.3%, carbon
Change boron 3%-6%, surplus is iron powder.
Mostly ferrous based powder metallurgical or the copper-base powder metallurgy used in the prior art, iron-base powder metallurgy material pressure resistance
Degree is high, hardness is big, can bear higher load, wearability is preferable；Copper based powder metallurgy material friction factor is small, noise is small,
Corrosion resistance is good, stable working, but bearing capacity is relatively poor.In material component of the present invention, the mass ratio of tin bronze powder and iron powder
Close to 1:1, it is significantly larger than other departing from iron content in traditional ferrous based powder metallurgical or copper-base powder metallurgy or copper powder content
The phenomenon of component, it is iron/copper base powder metallurgy, the advantages of having mixed ferrous based powder metallurgical and copper-base powder metallurgy.Boron carbide
Add and make it that product iron phase in version is ferro-boron phase, further improve the coefficient of friction of product, i.e. wearability.But add excess
Boron carbide can increase the porosity of product, reduce hardness on the contrary, so rare earth material ceria is added in the present invention, can be thin
Change crystal grain, optimize sintering process, it is modified in sintering process to material, improve sintering quality, improve the pressure of material
Routed intensity, hardness, antifriction and wearability.Manganese sulfide is widely used as conventional cutting agent.
Preferably, in piston composition, the mass ratio of tin bronze powder and iron powder is 0.8-1.0:1.Tin bronze powder and iron
The mass ratio of powder determines that the present invention is iron/copper base powder metallurgy, hardness and wear resistance can on far above other materials match.
Preferably, in piston composition, iron powder particle diameter is 120-160 mesh, and tin bronze powder particle diameter is 180-200 mesh.Iron
The particle diameter difference of powder and tin bronze powder can be substantially reduced the space of storeroom, improve product density.
The present invention additionally provides another technical solution while reasonable selection material mixture ratio：
A kind of preparation technology of powder metallurgy piston for damper, described method comprise the following steps：
(1) dispensing：Raw material is weighed by the composition and its mass percent of above-mentioned piston, is ground into after raw material is mixed mixed
Material, by batch mixing it is compressing piston blank；
(2) sinter：Piston blank is sintered at 900-1000 DEG C, room temperature is then at the uniform velocity cooled to, obtains piston blank；
(3) vapor is atomized：By the piston blank elder generation immersion oil after cooling, finishing, nebulisation operation is carried out after cleaning, in piston
Blank surface forms the diaphragm that thickness is 0.004-0.007mm, obtains piston finished product.
Powder metallurgical technique substitutes traditional zinc alloy diecasting moulding process, not only reduces cost of manufacture, also causes production
Product obtain great lifting on hardness and wear resistance.Product Precision and form and position tolerance after powder metallurgy formation reach 8 grades,
Therefore the size of product is not required to machine, more than Ra0.8 can be reached by the roughness of product surface after product finishing, artificial
Manufacturing procedure reduces 70%, had both reduced the waste and loss of the energy, and had improved the precision of product again.Finally, vapor is atomized
Processing can make product surface formation 0.004-0.007mm ferroso-ferric oxide diaphragm, can improve wearability and the cause of product
Close property, the density of product is more than 6.3g/cm3, and cause product that there is certain rust-proof effect.
The piston preparation technology process of the present invention is few, and cost of labor is low.It is low to energy requirements using once sintered shaping,
The steam treatment increase product density of product, improves rust-proofing ability.
Preferably, in step (1), described mixing is specially：Raw material is uniformly first ground into batch mixing, is then placed in
1-1.5h in batch mixer.Uniformly grinding can be sufficiently mixed raw material, reduce interiors of products space.
Preferably, in step (1), compressing middle pressure is 650MPa-850MPa, press time 1-2min.
The compressing micro-cracks that can effectively reduce product of high pressure, reduce product rejection rate.
Preferably, in step (2), sintering time 1-2h, cooling rate is 3-4 DEG C/min.Specially by blank
Sintered net, which is sent into the sintering furnace full of protection gas, to be sintered, and 1-2h is sintered at a temperature of 900-1000 DEG C, finally with 3-4
DEG C/min is at the uniform velocity cooled to room temperature.At the uniform velocity cooling can avoid because fast cooling and caused by product ftracture.
Preferably, in step (3), drying temperature is 300-380 DEG C, time 25-40min when vapor is atomized,
Logical 500-600 DEG C of vapor (steam) temperature, time 1.5-2h, holding temperature are 550-650 DEG C, time 25-35min, tapping temperature
For 400-500 DEG C, steam pressure 0.2-0.4MPa, final product is come out of the stove natural cooling.Water atomization steam treatment can make product
Surface forms 0.004-0.007mm ferroso-ferric oxide diaphragm, further improves product density, lifts properties of product.
Compared with prior art, the invention has the advantages that：
(1) in raw material the mass ratio of tin bronze powder and iron powder close to 1:1, it is iron/copper base powder metallurgy method, has mixed iron
The advantages of base powder metallurgy and common copper-base powder metallurgy.
(2) addition of boron carbide make it that product iron phase in version is ferro-boron phase, further improves the coefficient of friction of product, i.e., resistance to
Mill property.
(3) rare earth material ceria is added in invention, energy crystal grain thinning, optimizes sintering process, makes it in sintering process
In material is modified, improve sintering quality, improve crushing strength, hardness, antifriction and the wearability of material.Weaken simultaneously very
To elimination product fragility caused by boron carbide adds.
(4) in piston composition, iron powder particle diameter is 120-160 mesh, and tin bronze powder particle diameter is 180-200 mesh.Iron powder is blue or green with tin
The particle diameter difference of copper powder can be substantially reduced the space of storeroom, improve product density.
(5) powder metallurgical technique can be reduced even without artificial post-production, greatly reduced with one-shot forming product
Cost of labor.
(6) ferroso-ferric oxide diaphragm is formed in product surface using vapor atomization process, increases product density, simultaneously
Also there is certain rust-proof effect.
Embodiment
It is the specific embodiment of the present invention below, technical scheme is further described, but the present invention is simultaneously
It is not limited to these embodiments.
Embodiment 1
Dispensing：Raw material is weighed by the composition and its mass percent of piston in claim 1, containing tin bronze powder 40%, carbon
Powder 1%, manganese sulfide 1%, ceria 0.25%, boron carbide 4%, surplus are iron.The material weighed is pulverized respectively
End, wherein tin bronze powder particle diameter are 180 mesh, and iron powder particle diameter is 120 mesh, then powder is put into stirring 1h in batch mixer and obtains batch mixing.
Batch mixing is put into powder metallurgy die, keeps 2min to obtain piston blank under 750MPa pressure.
Sintering：The sintered net of piston blank is sent into the sintering furnace full of protection gas and is sintered, is burnt at 1000 DEG C
1.5h is tied, room temperature is at the uniform velocity finally cooled to 4 DEG C/min and obtains product.The product sintered after cooling is first sent into immersion oil by mesh bag
Immersion oil is carried out in machine, then is transported to the progress finishing full finishing mold on finishing machine Nei, finally carries out product by cleaning machine
Cleaning.
Vapor is atomized：Product after cleaning is subjected to vapor atomization process, drying temperature is 350 DEG C during atomization, when
Between be 35min, lead to 550 DEG C, time 2h of vapor (steam) temperature, holding temperature be 600 DEG C, time 30min, tapping temperature 450
DEG C, steam pressure 0.3MPa, final product is come out of the stove natural cooling.Water atomization steam treatment makes product surface form 0.004-
0.007mm ferroso-ferric oxide diaphragm.
Embodiment 2-3
With differing only in for embodiment 1, the content of dispensing ceria is respectively 0.2%, 0.3% in embodiment 2-3.
Embodiment 4-6
With differing only in for embodiment 1, the content of dispensing boron carbide is respectively 3%, 5%, 6% in embodiment 4-6.
Embodiment 7-8
With differing only in for embodiment 1, dispensing tin bronze powder particle diameter is respectively 190 mesh, 200 mesh in embodiment 7-8.
Embodiment 9-10
With differing only in for embodiment 1, dispensing iron powder particle diameter is respectively 140 mesh, 160 mesh in embodiment 9-10.
Embodiment 11-12
With differing only in for embodiment 1, sintering temperature is respectively 900 DEG C, 950 DEG C in embodiment 11-12.
Embodiment 13-14
With differing only in for embodiment 1, drying temperature when embodiment 13-14 reclaimed waters are steam atomizing is respectively 300 DEG C,
380 DEG C, the time is respectively 25min, 40min.
Embodiment 15-16
With differing only in for embodiment 1, logical vapor (steam) temperature when embodiment 15-16 reclaimed waters are steam atomizing is respectively 500
DEG C, 600 DEG C, time 1.5h.
Embodiment 17-18
With differing only in for embodiment 1, holding temperature when embodiment 17-18 reclaimed waters are steam atomizing is respectively 550 DEG C,
650 DEG C, the time is respectively 25min, 35min.
Embodiment 19-20
With differing only in for embodiment 1, tapping temperature when embodiment 19-20 reclaimed waters are steam atomizing is respectively 400 DEG C,
500 DEG C, steam pressure is respectively 0.2MPa, 0.4MPa.
Comparative example 1-4
With differing only in for embodiment 1, in comparative example 1-4 the content of dispensing tin bronze powder be respectively 90%, 80%,
20%th, 3%.
Comparative example 5
With differing only in for embodiment 1, dispensing does not add ceria in comparative example 5.
Comparative example 6
With differing only in for embodiment 1, dispensing does not add boron carbide in comparative example 6.
Its crushing strength and the hardness such as institute of table 1 are tested by the auto absorber piston of above material mixture ratio and technique productions
Show：
Table 1：The crushing strength and hardness of product in embodiment 1-20
It can be seen from the data in Table 1 that in PM technique of the iron based on copper-based, the too high levels of ceria
Or the too low crushing strength that can all reduce product, boron carbide can increase the hardness of product, but the boron carbide of too high amount can increase
Add product fragility.The particle diameter of control tin bronze powder and iron powder can reduce interiors of products hole, be advantageous to sinter.In general,
The product of high temperature sintering has higher hardness.And the processing of vapor atomization surface has substantially no effect on product hardness and conquassation is strong
Degree, simply increase product density and antirust ability.
Table 2：The crushing strength and hardness of product in comparative example 1-6
With reference to the data of table 1 and table 2, to can be seen that comparative example 1-4 essence be copper-base powder metallurgy and iron-based powder smelting
Gold, compared to traditional kirsite, its intensity and hardness all increase, but iron copper-base powder metallurgy is not only in conjunction with both excellent
Gesture, while improve the intensity of product and hardness by ceria and boron carbide.
It is skilled to this area although having been made a detailed description to the present invention and being cited some specific embodiments
For technical staff, as long as it is obvious that can make various changes or correct without departing from the spirit and scope of the present invention.
Claims (8)
1. a kind of shock absorber piston, it is characterised in that described shock absorber piston is made up of following composition and its mass percent：
Tin bronze powder 36%-45%, carbon dust 0.5%-1.3%, manganese sulfide 0.5%-1.0%, ceria 0.2%-0.3%, carbonization
Boron 3%-6%, surplus are iron powder.
2. piston for damper according to claim 1, it is characterised in that the mass ratio of tin bronze powder and iron powder is 0.5-
1.5:1。
3. piston for damper according to claim 1 or 2, it is characterised in that the particle diameter of the iron powder is 120-160
Mesh.
4. piston for damper according to claim 1 or 2, it is characterised in that the particle diameter of the tin bronze powder is 180-
200 mesh.
5. a kind of preparation technology of shock absorber piston, it is characterised in that described method comprises the following steps：
(1) dispensing：Weigh raw material by the composition and its mass percent of piston in claim 1, by batch mixing is compressing must be living
Fill in blank；
(2) sinter：Piston blank is sintered at 900-1000 DEG C, room temperature is then at the uniform velocity cooled to, obtains piston blank；
(3) vapor is atomized：By the piston blank elder generation immersion oil after cooling, finishing, nebulisation operation is carried out after cleaning, in piston blank
Surface forms the diaphragm that thickness is 0.004-0.007mm, obtains piston finished product.
6. the preparation technology of shock absorber piston according to claim 5, it is characterised in that the compressing middle pressure is
650MPa-850MPa, press time 1-2min.
7. the preparation technology of shock absorber piston according to claim 5, it is characterised in that the sintering time is 1-2h,
Cooling rate is 3-4 DEG C/min.
8. the preparation technology of shock absorber piston according to claim 5, it is characterised in that the atomization is specially：Atomization
When drying temperature be 300-380 DEG C, time 25-40min, lead to 500-600 DEG C of vapor (steam) temperature, time 1.5-2h, insulation temperature
Spend for 550-650 DEG C, time 25-35min, tapping temperature is 400-500 DEG C, steam pressure 0.2-0.4MPa, is finally produced
Product, which are come out of the stove, naturally cools to room temperature.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109108297A (en) * | 2018-09-14 | 2019-01-01 | 宁波瑞丰汽车零部件有限公司 | A kind of automobile steering power the cylinder piston |
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