CN113897024B - Wear-resistant polyether-ether-ketone material for protecting easily-worn unit and application thereof - Google Patents
Wear-resistant polyether-ether-ketone material for protecting easily-worn unit and application thereof Download PDFInfo
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- CN113897024B CN113897024B CN202111273825.7A CN202111273825A CN113897024B CN 113897024 B CN113897024 B CN 113897024B CN 202111273825 A CN202111273825 A CN 202111273825A CN 113897024 B CN113897024 B CN 113897024B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
- C08L61/16—Condensation polymers of aldehydes or ketones with phenols only of ketones with phenols
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2301/00—Using particular materials
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Abstract
The invention relates to a wear-resistant polyether-ether-ketone material for protecting an easy-to-wear unit and application thereof, wherein the wear-resistant polyether-ether-ketone material comprises the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber. The wear-resistant polyether-ether-ketone material provided by the invention has low dynamic friction coefficient and excellent wear resistance, is not easy to wear by the glass fiber reinforced material and is not easy to wear the 6061 aluminum alloy seat, and the wear-resistant polyether-ether-ketone material has excellent mechanical properties; according to the invention, the polyether-ether-ketone material is prepared into the short spacer, and the short spacer is arranged between the plastic spacer prepared from the glass fiber reinforced material and the 6061 aluminum alloy seat which is easy to wear, so that the wear of the 6061 aluminum alloy seat can be reduced, and the plastic spacer prepared from the glass fiber reinforced material can be applied to a rocker shaft, so that the purpose of light weight of a vehicle is achieved.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a wear-resistant polyether-ether-ketone material for protecting an easily-worn unit and application thereof.
Background
Lightweight is one of the subjects of development of the automotive industry. The automobile industry is working to replace metal parts such as unrecoverable thermosetting plastics, fuel systems, exhaust systems, cooling systems and the like near engines with high molecular materials to meet the requirement of light weight.
The spacer bush is sleeved on the integral rocker arm shaft for the gas inlet and the gas outlet of the diesel engine of the commercial vehicle, the spacer bush and the rocker arm seat form a rotary friction pair, and the positioning of the rocker arm for the gas inlet and the gas outlet and the axial movement prevention are realized. The traditional engine rocker shaft spacer bush adopts a steel spacer bush with larger weight, so that the lightweight development of the engine is restricted.
For the purpose of realizing light weight, the Chinese patent application CN110700913A replaces a steel spacer of a rocker shaft of an engine with a plastic spacer, and discloses that the raw materials of the spacer can be replaced by PA4T, PA9T, PA10T, PPS, PEEK, PI, LCP and PSU. Polyether ether ketone (PEEK) in the thermoplastic materials is high in price, so that the cost of the spacer bush is increased; the nylon thermoplastic material PA4T, PA9T, PA T has the advantages of low price, small weight and good rigidity, and becomes the preferred material of the plastic spacer. However, the rocker arm seat and the plastic spacer bush made of nylon thermoplastic materials always have serious abrasion during the grinding.
Disclosure of Invention
In order to solve the problem that the rocker arm seat and the plastic spacer bush manufactured by the nylon thermoplastic material are worn seriously during grinding, the polyether-ether-ketone material is used for manufacturing the short spacer bush, and the short spacer bush is arranged between the 6061 aluminum alloy seat which is easy to wear and the plastic spacer bush manufactured by the glass fiber reinforced material, so that the wear of the 6061 aluminum alloy seat can be reduced.
The conventional polyether-ether-ketone material does not meet the grinding scene of the 6061 aluminum alloy seat and the glass fiber reinforced material, and the polyether-ether-ketone material with low dynamic friction coefficient and excellent wear resistance is developed, so that the aim of not wearing the 6061 aluminum alloy seat while being difficult to wear by the glass fiber reinforced material is fulfilled, and the material has excellent mechanical properties.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
in a first aspect, the invention provides a wear-resistant polyetheretherketone material for protecting an easily worn unit, comprising the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber.
Based on the technical scheme, the wear-resistant polyether-ether-ketone material provided by the invention has low dynamic friction coefficient and excellent wear resistance, is not easy to wear by the glass fiber reinforced nylon material, and is not easy to wear the 6061 aluminum alloy seat, and the wear-resistant polyether-ether-ketone material has excellent mechanical properties.
On the basis of the wear-resistant polyether-ether-ketone material for protecting the easily-worn unit, the easily-worn unit is made of 6061 aluminum alloy material as the optimization of the technical scheme of the invention.
On the basis of the wear-resistant polyether-ether-ketone material for protecting the easily-worn unit, the wear-resistant polyether-ether-ketone material as the preferable technical scheme of the invention comprises the following components: 55 parts of polyether-ether-ketone resin; 15 parts of flake graphite; 15 parts of polytetrafluoroethylene; 15 parts of carbon fiber.
On the basis of the wear-resistant polyether-ether-ketone material for protecting the easily worn unit, the invention is preferable as the technical scheme of the invention, wherein the average particle size of the crystalline flake graphite is 10-200 mu m, and the specific surface area is more than 1m 2 /g; the average grain diameter of the polytetrafluoroethylene is 1-20 mu m, and the specific surface area is more than 2m 2 /g; the average fiber diameter of the carbon fiber is 2-20 mu m; the length-diameter ratio of the carbon fiber is 150-1500.
In a second aspect, the present invention provides a method of manufacturing a wear part for protecting an easily worn unit, comprising the steps of:
providing the wear-resistant polyether-ether-ketone material for protecting the easily worn unit;
premixing dry polyether-ether-ketone, polytetrafluoroethylene and crystalline flake graphite, and adding the mixture into a double-screw extruder through a main feeding port;
adding carbon fibers into a double-screw extruder through a side feeding port;
melt extrusion and granulation are carried out by a double-screw extruder at 320-370 ℃ to obtain wear-resistant polyether-ether-ketone master batch;
and dehumidifying and drying the wear-resistant polyether-ether-ketone master batch, and performing injection molding at 320-370 ℃ to obtain the wear-resistant part for protecting the easily-worn unit.
Based on the technical scheme, the wear-resistant polyether-ether-ketone material is prepared into the wear-resistant piece, and the wear-resistant piece is arranged between the glass fiber reinforced nylon material element and the 6061 aluminum alloy element, is not easy to wear by the glass fiber reinforced nylon material element, is not easy to wear by the 6061 aluminum alloy element, and has a protection effect on the 6061 aluminum alloy element.
In a third aspect, the invention provides a short spacer for an engine rocker shaft, which is used for being arranged between the end face of a long spacer and a 6061 aluminum alloy seat; the long spacer bush is made of glass fiber reinforced nylon material; the engine rocker shaft short spacer comprises the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber.
Based on the technical scheme, the short spacer prepared from the polyether-ether-ketone material is arranged between the 6061 aluminum alloy seat which is easy to wear and the plastic spacer prepared from the glass fiber reinforced material, so that the wear of the 6061 aluminum alloy seat can be reduced, and the plastic spacer prepared from the glass fiber reinforced nylon material can be applied to a rocker shaft, thereby achieving the aim of light weight of a vehicle.
On the basis of the short spacer bush of the engine rocker shaft, which is provided by the invention, as the optimization of the technical scheme of the invention, the end face of the long spacer bush is C-shaped; the end face of the short spacer bush is annular.
On the basis of the short spacer sleeve of the engine rocker shaft, which is provided by the invention, as the optimization of the technical scheme of the invention, the long spacer sleeve is made of 50% glass fiber reinforced PA6T material.
In a fourth aspect, the present invention provides an engine rocker shaft limiter assembly, comprising, in order: 6061 aluminum alloy seat, annular short spacer bush and C-shaped long spacer bush, wherein the long spacer bush is made of glass fiber reinforced nylon material; the short spacer comprises the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber.
On the basis of the engine rocker shaft limiting part combination, the long spacer bush is preferably made of 50% glass fiber reinforced PA6T material.
In a fifth aspect, the present invention provides an engine rocker shaft comprising an engine rocker shaft stop assembly as described above.
The invention has the following advantages and beneficial effects:
according to the invention, 3 anti-wear agents are adopted to modify the polyether-ether-ketone material, so that the flake graphite can provide good lubricating effect in the initial stage of grinding, and the friction coefficient and abrasion are reduced; polytetrafluoroethylene can continuously reduce friction coefficient and abrasion in the middle of the counter-grinding. Meanwhile, the 2 soft materials can well protect and wear-resistant polyether-ether-ketone material pair-ground materials. The carbon fiber can improve the strength and the surface hardness of the wear-resistant polyether-ether-ketone material and obviously reduce the abrasion of the material. The dynamic friction coefficient of the wear-resistant polyether-ether-ketone material is less than 0.4, and the abrasion is less than 80 multiplied by 10 by the combination of 3 wear-resistant agents -6 mg/Nm。
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 illustrates an engine rocker shaft limiter assembly provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention relates to a rocker shaft spacer for an engine of an automobile, which is required to have the performances of light weight, high strength, wear resistance, high temperature resistance and the like. Polyether ether ketone (PEEK) is a wholly aromatic semicrystalline thermoplastic material, and has the characteristics of high temperature resistance, self lubrication, easiness in processing, high mechanical strength and the like because the macromolecular chain of PEEK contains rigid benzene rings, flexible ether bonds and carbonyl groups for improving intermolecular actions, and the structure is regular. PEEK has good chemical resistance, flame resistance, peeling resistance, hydrolysis resistance, fatigue resistance, insulativity, stability, high temperature resistance and other properties, and also has good wear resistance.
In order to reduce the cost of raw materials, the engine rocker shaft spacer bush is made of glass fiber reinforced nylon materials; the glass fiber reinforced nylon material is severely worn on the 6061 aluminum alloy seat, so the invention provides an engine rocker shaft limiting part assembly, which sequentially comprises: the 6061 aluminum alloy seat, the annular short spacer bush and the C-shaped long spacer bush adopt the annular short spacer bush to protect the 6061 aluminum alloy seat.
The invention verifies through experiments that the annular short spacer prepared from the prior glass fiber, aramid fiber or nano inorganic material and other system modified polyether-ether-ketone materials can wear 6061 aluminum alloy seats at high temperature, or wear glass fiber reinforced nylon split spacer, or wear the annular short spacer severely, and none meets the requirements. For example, there is a polyether-ether-ketone material reinforced by inorganic nano-filler, the inorganic filler is nano-level kaolin (known as inorganic oxide), the nano-level kaolin is made into an annular short spacer, the annular short spacer and a C-shaped long spacer and a rocker arm which are prepared by glass fiber reinforced nylon material are sleeved on a rocker arm shaft of an engine, the sleeved sequence is a rocker arm, the C-shaped spacer, the annular short spacer and a 6061 aluminum alloy seat, then lateral force is applied in the axial direction for compaction, and dynamic friction and wear tests under the free motion state or between any two pairs of friction pairs can be completed by adopting different installation and fixation modes. The annular short spacer prepared from the inorganic nano filler reinforced polyether-ether-ketone material simulates a dynamic friction and wear test of a friction pair matched with the annular short spacer under high-speed running of an engine at the high temperature of 130 ℃ and under oil drip lubrication and 200N lateral force, and then the axial maximum wear depth values of the C-shaped long spacer, the annular short spacer and the 6061 aluminum alloy seat are measured, the wear of the 6061 aluminum alloy seat is required to be not more than 0.02mm, the wear of the C-shaped long spacer and the annular short spacer is required to be not more than 0.05mm within 20h, and the smaller the wear value is, the better. The results show that when the annular short spacer is self-abrasion-resistant, the 6061 aluminum alloy seat is excessively abraded, or when the C-shaped long spacer is not abraded, the annular short spacer is not self-abrasion-resistant.
The invention improves the wear-resistant polyether-ether-ketone material of the engine rocker shaft short spacer bush, adopts crystalline flake graphite and carbon fiber as fillers instead of inorganic fillers, and comprises the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber. The improved wear-resistant polyether-ether-ketone material has low dynamic friction coefficient and excellent wear resistance, is not easy to wear by glass fiber reinforced materials and is not easy to wear 6061 aluminum alloy seats, and the wear-resistant polyether-ether-ketone material has excellent mechanical properties and high temperature resistance.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
The present invention will be specifically described below with reference to examples, but the scope of the present invention is not limited thereto.
In a first aspect, the invention provides a wear-resistant polyetheretherketone material for protecting an easily worn unit, comprising the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber.
Based on the technical scheme, the polyether-ether-ketone material provided by the invention has low dynamic friction coefficient and excellent wear resistance, is not easy to wear by the glass fiber reinforced material, and is not easy to wear the 6061 aluminum alloy seat, and the material has excellent mechanical properties.
On the basis of the wear-resistant polyether-ether-ketone material for protecting the easily-worn unit, the easily-worn unit is made of 6061 aluminum alloy material as the optimization of the technical scheme of the invention.
On the basis of the wear-resistant polyether-ether-ketone material for protecting the easily-worn unit, the wear-resistant polyether-ether-ketone material as the preferable technical scheme of the invention comprises the following components: 55 parts of polyether-ether-ketone resin; 15 parts of flake graphite; 15 parts of polytetrafluoroethylene; 15 parts of carbon fiber.
On the basis of the wear-resistant polyether-ether-ketone material for protecting the easily-worn unit, the technical scheme of the invention is preferably that the crystalline flake graphite is hexagonal natural crystalline graphite, has a lamellar structure, has an average particle size of 10-200 mu m and a specific surface area of more than 1 mu m 2 /g。
The PTFE has an average particle diameter of 1-20 μm and a specific surface area of > 2m 2 /g。
The carbon fiber is of a micron-sized fibrous character structure and is of a fiber with a circular cross section; the average fiber diameter of the carbon fibers is 2 to 20 μm, preferably 4 to 15 μm; the average fiber length of the carbon fiber is 2-7 mm; the length-diameter ratio of the carbon fiber is 150-1500. The carbon fibers may be carbonaceous non-graphitized, lightly graphitized, and highly graphitized. The carbon fibers may be anisotropic pitch-based carbon fibers, PAN-based carbon fibers, isotropic pitch-based carbon fibers, preferably isotropic pitch-based carbon fibers.
In a second aspect, the present invention provides a method of manufacturing a wear part for protecting an easily worn unit, comprising the steps of:
the wear-resistant polyether-ether-ketone material for protecting the easily worn unit is provided,
premixing dry PEEK, PTFE and graphite, and adding into a main feeding port of a double-screw extruder;
adding carbon fibers into a double-screw extruder through a side feeder;
melt extrusion and granulation are carried out by a double screw extruder at the set temperature of 320-370 ℃ to obtain wear-resistant polyether-ether-ketone master batch;
and (3) dehumidifying and drying the wear-resistant polyether-ether-ketone master batch, and performing injection molding at 320-370 ℃.
The preparation method comprises the following steps:
premixing the dried PEEK, PTFE and graphite by using a high-speed stirrer, accurately metering, adding into a main feeding port of a double-screw extruder, adding carbon fibers into the double-screw extruder by using a side feeding machine, and carrying out melt extrusion and granulation by using the double-screw extruder at a set temperature of 320-370 ℃ to obtain a wear-resistant PEEK composition; and (3) dehumidifying and drying the obtained granular PEEK composition for 4 hours at 120-160 ℃, and setting the barrel temperature of an injection molding machine at 320-370 ℃ to finish injection molding.
Based on the technical scheme, the polyether-ether-ketone material is prepared into the wear-resistant piece arranged between the glass fiber reinforced material and the 6061 aluminum alloy.
In a third aspect, the invention provides an engine rocker shaft spacer comprising a long spacer and a short spacer, wherein the short spacer is arranged between the end face of the long spacer and an aluminum alloy base; the long spacer bush is made of glass fiber reinforced nylon material; the short spacer comprises the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber.
Based on the technical scheme, the short spacer prepared from the polyether-ether-ketone material is arranged between the 6061 aluminum alloy seat which is easy to wear and the plastic spacer prepared from the glass fiber reinforced material, so that the wear of the 6061 aluminum alloy seat can be reduced, the plastic spacer can be applied to a rocker shaft, and the purpose of light weight of a vehicle is achieved.
On the basis of the engine rocker shaft spacer sleeve provided by the invention, as the optimization of the technical scheme of the invention, the end face of the long spacer sleeve is C-shaped; the end face of the short spacer bush is annular.
On the basis of the engine rocker shaft spacer provided by the invention, as the optimization of the technical scheme of the invention, the long spacer is made of 50% glass fiber reinforced PA6T material.
In a fourth aspect, the present invention provides an engine rocker shaft limiter assembly, comprising, in order: 6061 aluminum alloy seat, annular short spacer bush and C-shaped long spacer bush, wherein the long spacer bush is made of glass fiber reinforced nylon material; the short spacer comprises the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber.
On the basis of the engine rocker shaft limiting part combination, the long spacer bush is preferably made of 50% glass fiber reinforced PA6T material.
In a fifth aspect, the present invention provides an engine rocker shaft comprising an engine rocker shaft stop assembly as described above.
The specific embodiments provided by the invention are as follows:
the raw material types, brands and sources of the components in the examples and comparative examples of the invention are shown in Table 1:
TABLE 1
Example 1
The wear-resistant polyether-ether-ketone material for protecting the easily-worn unit comprises the following components in parts by weight: 85 parts of polyether-ether-ketone resin; 5 parts of flake graphite; 5 parts of polytetrafluoroethylene; and 5 parts of carbon fiber.
The preparation method of the wear-resistant piece for protecting the easily-worn unit provided by the embodiment comprises the following steps:
premixing 85 parts of PEEK, 5 parts of PTFE and 5 parts of crystalline flake graphite by using a high-speed stirrer, accurately metering, adding into a main feeding port of a double-screw extruder, adding 5 parts of carbon fibers into the double-screw extruder by using a side feeding machine, and carrying out melt extrusion and granulation by using the double-screw extruder at a set temperature of 360 ℃ to obtain wear-resistant polyether-ether-ketone master batch; and (3) dehumidifying and drying the obtained wear-resistant polyether-ether-ketone master batch for 4 hours at 140 ℃, setting the temperature of a barrel of an injection molding machine at 360 ℃ to finish injection molding, and obtaining the engine rocker shaft short spacer bush.
Example 2
The wear-resistant polyether-ether-ketone material for protecting the easily-worn unit comprises the following components in parts by weight: 70 parts of polyether-ether-ketone resin; 10 parts of flake graphite; 10 parts of polytetrafluoroethylene; 10 parts of carbon fiber.
The preparation method of the wear-resistant piece for protecting the easily-worn unit provided by the embodiment comprises the following steps:
premixing 70 parts of PEEK, 10 parts of PTFE and 10 parts of crystalline flake graphite by using a high-speed stirrer, accurately metering, adding into a main feeding port of a double-screw extruder, adding 10 parts of carbon fibers into the double-screw extruder by using a side feeding machine, and carrying out melt extrusion and granulation by using the double-screw extruder at a set temperature of 360 ℃ to obtain wear-resistant polyether-ether-ketone master batch; and (3) dehumidifying and drying the obtained wear-resistant polyether-ether-ketone master batch for 4 hours at 140 ℃, setting the temperature of a barrel of an injection molding machine at 360 ℃ to finish injection molding, and obtaining the engine rocker shaft short spacer bush.
Example 3
The wear-resistant polyether-ether-ketone material for protecting the easily-worn unit comprises the following components in parts by weight: 55 parts of polyether-ether-ketone resin; 15 parts of flake graphite; 15 parts of polytetrafluoroethylene; 15 parts of carbon fiber.
The preparation method of the wear-resistant piece for protecting the easily-worn unit provided by the embodiment comprises the following steps:
premixing 55 parts of PEEK, 15 parts of PTFE and 15 parts of crystalline flake graphite by using a high-speed stirrer, accurately metering, adding into a main feeding port of a double-screw extruder, adding 15 parts of carbon fibers into the double-screw extruder by using a side feeding machine, and carrying out melt extrusion and granulation by using the double-screw extruder at a set temperature of 360 ℃ to obtain wear-resistant polyether-ether-ketone master batch; and (3) dehumidifying and drying the obtained wear-resistant polyether-ether-ketone master batch for 4 hours at 140 ℃, setting the temperature of a barrel of an injection molding machine at 360 ℃ to finish injection molding, and obtaining the engine rocker shaft short spacer bush.
Comparative example 1
The wear-resistant polyether-ether-ketone material for protecting the easily-worn unit comprises the following components in parts by weight: 90 parts of polyether-ether-ketone resin; 30 parts of flake graphite.
The preparation method of the wear-resistant piece for protecting the abrasion-prone unit provided by the comparative example comprises the following steps:
premixing 90 parts of PEEK and 30 parts of flake graphite by using a high-speed stirrer, accurately metering, adding into a main feeding port of a double-screw extruder, and carrying out melt extrusion and granulation by the double-screw extruder at a set temperature of 360 ℃ to obtain wear-resistant polyether-ether-ketone master batch; and (3) dehumidifying and drying the obtained wear-resistant polyether-ether-ketone master batch for 4 hours at 140 ℃, setting the temperature of a barrel of an injection molding machine at 360 ℃ to finish injection molding, and obtaining the engine rocker shaft short spacer bush.
Comparative example 2
The wear-resistant polyether-ether-ketone material for protecting the easily-worn unit comprises the following components in parts by weight: 90 parts of polyether-ether-ketone resin; 30 parts of PTFE.
The preparation method of the wear-resistant piece for protecting the abrasion-prone unit provided by the comparative example comprises the following steps:
premixing 90 parts of PEEK and 30 parts of PTFE (polytetrafluoroethylene) by using a high-speed stirrer, accurately metering, adding into a main feeding port of a double-screw extruder, and carrying out melt extrusion and granulation by the double-screw extruder at a set temperature of 360 ℃ to obtain wear-resistant polyether-ether-ketone master batch; and (3) dehumidifying and drying the obtained wear-resistant polyether-ether-ketone master batch for 4 hours at 140 ℃, setting the temperature of a barrel of an injection molding machine at 360 ℃ to finish injection molding, and obtaining the engine rocker shaft short spacer bush.
Comparative example 3
The wear-resistant polyether-ether-ketone material for protecting the easily-worn unit comprises the following components in parts by weight: 90 parts of polyether-ether-ketone resin; 30 parts of carbon fiber.
The preparation method of the wear-resistant piece for protecting the abrasion-prone unit provided by the comparative example comprises the following steps:
accurately metering 90 parts of PEEK (polyether-ether-ketone) by using a high-speed stirrer, adding the dried PEEK into a main feeding port of a double-screw extruder, adding 30 parts of carbon fibers into the double-screw extruder through a side feeding machine, and carrying out melt extrusion and granulation through the double-screw extruder at a set temperature of 360 ℃ to obtain wear-resistant polyether-ether-ketone master batch; and (3) dehumidifying and drying the obtained wear-resistant polyether-ether-ketone master batch for 4 hours at 140 ℃, setting the temperature of a barrel of an injection molding machine at 360 ℃ to finish injection molding, and obtaining the engine rocker shaft short spacer bush.
Comparative example 4
The wear-resistant polyether-ether-ketone material for protecting the easily-worn unit comprises the following components in parts by weight: 80 parts of polyether-ether-ketone resin; 15 parts of flake graphite; 15 parts of carbon fiber.
The preparation method of the wear-resistant piece for protecting the abrasion-prone unit provided by the comparative example comprises the following steps:
premixing 80 parts of PEEK and 15 parts of flake graphite by using a high-speed stirrer, accurately metering, adding into a main feeding port of a double-screw extruder, adding 15 parts of carbon fibers into the double-screw extruder by using a side feeding machine, and carrying out melt extrusion and granulation by using the double-screw extruder at a set temperature of 360 ℃ to obtain wear-resistant polyether-ether-ketone master batch; and (3) dehumidifying and drying the obtained wear-resistant polyether-ether-ketone master batch for 4 hours at 140 ℃, setting the temperature of a barrel of an injection molding machine at 360 ℃ to finish injection molding, and obtaining the engine rocker shaft short spacer bush.
The wear-resistant polyether-ether-ketone master batch is simultaneously injection molded into a short spacer sleeve of the engine rocker shaft, and the wear resistance test is carried out by referring to GB/T3960-2016, and the wear-resistant polyether-ether-ketone master batch is made of 45# steel and 50% glass fiber reinforced PA6T, and the results are shown in Table 2.
TABLE 2 parts by weight of the components in examples 1-3, comparative examples 1-4 and Performance test
As can be seen from examples 1-3, the wear-resistant polyether-ether-ketone material provided by the invention has a dynamic friction coefficient of less than 0.4 and an abrasion of less than 80 multiplied by 10 when being subjected to counter-grinding with metal and plastic -6 mg/Nm. When the flake graphite is used alone (see comparative example 1), the tensile strength of the material is low and the abrasion is large. When PTFE alone (see comparative example 2), the abrasion of the material was still high. When carbon fiber is used alone (see comparative example 3), the dynamic friction coefficient of the material is high and the abrasion to the abrasion piece is largely failed due to the abrasion with the plastic, although the strength of the material is high and the abrasion is small. When the antiwear agent of 2 is used for compounding (see comparative example 4), it is still difficult to achieve a good level of friction coefficient and wear of the material.
Comparative example 5
The wear-resistant polyether-ether-ketone material for protecting the easily-worn unit comprises the following components in parts by weight: 55 parts of polyether-ether-ketone resin; nano Al 2 O 3 15 parts; 15 parts of polytetrafluoroethylene; 15 parts of carbon fiber.
The preparation method of the wear-resistant piece for protecting the abrasion-prone unit provided by the comparative example comprises the following steps:
55 parts of dried polyether-ether-ketone resin and nano Al are mixed by a high-speed stirrer 2 O 3 15 parts of polytetrafluoroethylene and 15 parts of polytetrafluoroethylene are premixed, a main feeding port of a double-screw extruder is added after accurate metering, 15 parts of carbon fibers are added into the double-screw extruder through a side feeding machine, and melt extrusion and granulation are carried out through the double-screw extruder at a set temperature of 360 ℃ to obtain wear-resistant polyether-ether-ketone master batch; and (3) dehumidifying and drying the obtained wear-resistant polyether-ether-ketone master batch for 4 hours at 140 ℃, setting the temperature of a barrel of an injection molding machine at 360 ℃ to finish injection molding, and obtaining the engine rocker shaft short spacer bush.
The engine rocker shaft short spacer prepared in this comparative example was subjected to wear resistance test with reference to GB/T3960-2016, and the results are shown in Table 3 for an open C-shaped spacer and an aluminum alloy 6061 support, both of which are made of 50% glass fiber reinforced PA6T material.
TABLE 3 Table 3
Table 3 shows that the engine rocker shaft short spacer prepared in the comparative example has good wear resistance, but has large wear resistance to the aluminum alloy seat, and is not suitable for the engine rocker shaft limiting part combination comprising the 6061 aluminum alloy seat, the annular short spacer and the C-shaped long spacer.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. An engine rocker shaft short spacer bush is characterized in that: is used for being arranged between the end face of the long spacer bush and the 6061 aluminum alloy seat; the long spacer bush is made of glass fiber reinforced nylon material; the engine rocker shaft short spacer comprises the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber.
2. The engine rocker shaft short spacer of claim 1 wherein the end face of the long spacer is C-shaped; the end face of the engine rocker shaft short spacer bush is annular.
3. The engine rocker shaft bushing of claim 1 wherein the engine rocker shaft bushing comprises the following composition: 55 parts of polyether-ether-ketone resin; 15 parts of flake graphite; 15 parts of polytetrafluoroethylene; 15 parts of carbon fiber.
4. The engine rocker shaft short spacer according to claim 1, whereinThe average grain diameter of the flake graphite is 10-200 mu m, and the specific surface area is more than 1m 2 /g; the average grain diameter of the polytetrafluoroethylene is 1-20 mu m, and the specific surface area is more than 2m 2 /g; the average fiber diameter of the carbon fibers is 2-20 mu m; the length-diameter ratio of the carbon fiber is 150-1500.
5. An engine rocker shaft limiter assembly, characterized in that: the method sequentially comprises the following steps: 6061 aluminum alloy seat, annular short spacer bush and C-shaped long spacer bush, wherein the long spacer bush is made of glass fiber reinforced nylon material; the short spacer comprises the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber.
6. The engine rocker shaft short spacer assembly according to any one of claims 1 to 4, according to claim 5, wherein: the long spacer bush is made of 50% glass fiber reinforced PA6T material.
7. An engine rocker shaft, characterized by: an engine rocker shaft limiter assembly comprising the engine rocker shaft limiter of claim 5.
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| CN103242641B (en) * | 2013-05-30 | 2015-07-08 | 吉林大学 | Polyaryletherketone-based abrasion-resistant composite material and preparation method thereof |
| CN103470633B (en) * | 2013-09-17 | 2017-01-18 | 常州君华特种工程塑料制品有限公司 | PEEK (polyether-ether-ketone) wear-resisting shaft sleeve applied to heald frame of textile machine |
| US10125809B2 (en) * | 2016-08-01 | 2018-11-13 | GM Global Technology Operations LLC | Crankshaft assemblies and methods of manufacturing the same |
| CN109777036B (en) * | 2019-01-04 | 2021-07-23 | 扬州市维纳复合材料科技有限公司 | Polyether ether ketone based wear-resistant composite material and preparation method thereof |
| CN112196635A (en) * | 2020-08-31 | 2021-01-08 | 宁波市奉化永宏汽车零部件有限公司 | Ceramic rocker arm of automobile engine |
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