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CN107747519B - Novel piston and manufacturing method thereof - Google Patents

Novel piston and manufacturing method thereof Download PDF

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Publication number
CN107747519B
CN107747519B CN201711017101.XA CN201711017101A CN107747519B CN 107747519 B CN107747519 B CN 107747519B CN 201711017101 A CN201711017101 A CN 201711017101A CN 107747519 B CN107747519 B CN 107747519B
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CN
China
Prior art keywords
piston
thermoplastic polyimide
piston head
novel
axial end
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Application number
CN201711017101.XA
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Chinese (zh)
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CN107747519A (en
Inventor
顾伟
杨帆
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Scm Advanced Material Tech Co ltd
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Scm Advanced Material Tech Co ltd
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Priority to CN201711017101.XA priority Critical patent/CN107747519B/en
Publication of CN107747519A publication Critical patent/CN107747519A/en
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Publication of CN107747519B publication Critical patent/CN107747519B/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00Pistons 
    • F02F3/0015Multi-part pistons
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/76Measuring, controlling or regulating
    • B29C45/78Measuring, controlling or regulating of temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00Pistons 
    • F02F3/0084Pistons  the pistons being constructed from specific materials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76494Controlled parameter
    • B29C2945/76531Temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2079/00Use of polymers having nitrogen, with or without oxygen or carbon only, in the main chain, not provided for in groups B29K2061/00 - B29K2077/00, as moulding material
    • B29K2079/08PI, i.e. polyimides or derivatives thereof

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

The invention provides a novel piston and a manufacturing method thereof, wherein the novel piston comprises a piston body and a piston head, the piston head is embedded in the end part of the piston body, and a thermoplastic polyimide layer and a ceramic coating are respectively arranged on the inner axial end surface and the outer axial end surface of the piston head. Compared with the prior art, the invention has the following beneficial effects: 1. the piston has a simple structure, does not have a piston ring, and has simpler structure and more reliable performance; 2. the piston is lighter, so that the transmission efficiency of the engine is higher; 3. compared with a piston ring structure, the piston ring structure is more wear-resistant and has lower friction coefficient; the service life is longer; 4. the invention adopts special modified thermoplastic polyimide; below 250 deg.c, the product has stable size and linear expansion coefficient similar to that of aluminum alloy.

Description

Novel piston and manufacturing method thereof
Technical Field
The invention relates to a novel piston and a manufacturing method thereof, belonging to the field of automobile and other engine pistons.
Background
With the rapid development of science and technology, various new materials are increasingly applied to the design of engines, along with the improvement of requirements of users and the improvement of emission standards of automobile manufacturers; the engine is necessarily required to be continuously developed in the direction of high rotation speed, high power and low beat emission. The piston acts as the heart of the engine, which is one of the most important parts of the engine; how to reduce the quality of the piston, improve the wear resistance of the piston, reduce the coefficient of friction of the piston and the piston cylinder, and improve the service life of the piston has important significance.
At present, most of the traditional pistons adopt a piston body and piston rings made of Al-Si materials to produce a piston assembly (as shown in figure 1); the structure is complex, the processing is complex, the wear resistance is poor, and the service life is short.
Disclosure of Invention
The invention provides a novel piston and a processing method thereof, aiming at solving the defects of complex structure, complex processing, poor performance and short service life in the prior art.
The invention is realized by the following technical scheme:
the utility model provides a novel piston, its includes piston body and piston head, the tip of piston body is located in the embedding of piston head, be equipped with thermoplastic polyimide layer and ceramic coating on the inboard axial terminal surface of piston head and the outside axial terminal surface respectively.
Preferably, the piston body is injection molded from thermoplastic polyimide.
Preferably, the material of the piston head is pure aluminum.
The manufacturing method of the novel piston comprises the following steps:
manufacturing a piston head, and respectively spraying a thermoplastic polyimide coating and a ceramic coating on the inner axial end face and the outer axial end face of the piston head to obtain an insert;
placing the insert into an injection mold, and injecting thermoplastic polyimide resin into the injection mold to obtain a blank;
after removing the stub bar of the blank, processing the outer diameter of the blank;
and cleaning oil stains and flash on the surface to obtain the novel piston.
Preferably, the manufacturing method of the piston head is a turning method.
Preferably, in the injection molding of the thermoplastic polyimide resin, the insert is heated to 200-250 ℃, the injection mold is preheated to 200-250 ℃, and the thermoplastic polyimide charging barrel is preheated to 400-500 ℃.
Preferably, the thermoplastic polyimide resin further contains carbon fibers and a solid lubricant, and the parts by weight of the thermoplastic polyimide resin, the carbon fibers and the solid lubricant are respectively as follows: 100 parts, 15-30 parts and 0-5 parts.
Preferably, the solid lubricant is selected from one or two of molybdenum disulfide and polytetrafluoroethylene.
The modified thermoplastic polyimide adopted by the invention is formed by modifying carbon fiber, a solid lubricant and thermoplastic polyimide; the material has the same thermal expansion coefficient with aluminum below 250 ℃; meanwhile, the friction coefficient is less than or equal to 0.04 under the condition of oil; in addition, the material has high mechanical strength.
Compared with the prior art, the invention has the following beneficial effects:
1. the piston has a simple structure, does not have a piston ring, and has simpler structure and more reliable performance;
2. the piston is lighter, so that the transmission efficiency of the engine is higher;
3. compared with a piston ring structure, the piston ring structure is more wear-resistant and has lower friction coefficient; the service life is longer.
4. The invention adopts special modified thermoplastic polyimide; below 250 deg.c, the product has stable size and linear expansion coefficient similar to that of aluminum alloy.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural view of a conventional piston;
FIG. 2 is a schematic structural view of the novel piston of the present invention;
FIG. 3 is a schematic view of the construction of the piston head of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in FIGS. 2 to 3, the invention provides a novel piston, which comprises a piston body 10 and a piston head 20, wherein the piston head 20 is embedded in the end part of the piston body 10, a thermoplastic polyimide layer 22 is arranged on the inner axial end surface of the piston head 20, and a ceramic coating 21 is arranged on the outer axial end surface of the piston head 20.
Wherein the piston head 20 is made of pure aluminum material by lathing; the piston body 10 is injection molded of thermoplastic polyimide.
The piston formed by tightly combining the thermoplastic polyimide piston body and the metal piston head provided by the invention removes the piston ring structure of the traditional piston, and has the advantages of lighter weight, better wear-resisting effect and lower friction loss, so that the energy consumption efficiency of an engine is improved, and the performance of the engine is improved.
The ceramic coating selected by the invention is ZS-911 wear-resistant waterproof coating of Beijing Zhishengweiwa.
Example 1
The processing method of the novel piston comprises the following steps:
s1, processing the metal rod into a cylindrical structure through a turning process to form the piston head; then, carrying out surface spraying treatment on the piston head to promote the adhesion of the coating, and respectively spraying a thermoplastic polyimide layer 22 and a ceramic coating 21 on the axial end face of the inner side and the axial end face of the outer side of the piston head to prepare an insert;
wherein, the spraying of the ceramic coating is to adopt powder electrostatic spraying at normal temperature and then carry out high-temperature curing at 400 ℃;
s2, heating the insert to 200-250 ℃, putting the insert into an injection mold preheated to 200-250 ℃, controlling the temperature of a charging barrel of thermoplastic polyimide to be 400-500 ℃, and injecting the thermoplastic polyimide into the injection mold to prepare a blank;
the thermoplastic polyimide comprises the following components in parts by weight:
thermoplastic polyimide resin: 100 parts of (a) a water-soluble polymer,
carbon fiber: 30 parts of.
S3, removing a stub bar of the blank in a turning mode, and machining the outer diameter of the blank to a required size;
and S4, cleaning oil stains and flash on the surface to obtain the piston.
By adopting the preferred scheme, the thermoplastic polyimide combined by metal and plastic and the thermoplastic polyimide adopted by injection molding are the same raw material, so that the metal and the plastic can be fully combined through heat conduction during injection molding.
Example 2
The processing method of the novel piston comprises the following steps:
s1, processing the metal rod into a cylindrical structure through a turning process to form the piston head; then, carrying out surface spraying treatment on the piston head to promote the adhesion of the coating, and respectively spraying a thermoplastic polyimide layer 22 containing carbon fibers and a solid lubricant and a ceramic coating 21 on the axial end face of the inner side and the axial end face of the outer side of the piston head to prepare an insert;
wherein, the spraying of the ceramic coating is to adopt powder electrostatic spraying at normal temperature and then carry out high-temperature curing at 400 ℃;
s2, heating the insert to 200-250 ℃, putting the insert into an injection mold preheated to 200-250 ℃, controlling the temperature of a charging barrel of thermoplastic polyimide to be 400-500 ℃, and injecting the thermoplastic polyimide containing carbon fibers and a solid lubricant into the injection mold to prepare a blank;
the thermoplastic polyimide comprises the following components in parts by weight:
thermoplastic polyimide resin: 100 parts of (a) a water-soluble polymer,
carbon fiber: 15 parts of (a) to (b),
molybdenum disulfide: 5 parts of the raw materials.
S3, removing a stub bar of the blank in a turning mode, and machining the outer diameter of the blank to a required size;
and S4, cleaning oil stains and flash on the surface to obtain the piston.
By adopting the preferable scheme, the thermoplastic polyimide prepared by the material has the same thermal expansion coefficient with aluminum at the temperature of below 250 ℃; meanwhile, the friction coefficient is less than or equal to 0.04 under the condition of oil, and the mechanical strength is high.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.

Claims (5)

1. The manufacturing method of the novel piston is characterized by comprising the following steps:
manufacturing a piston head, and respectively spraying a thermoplastic polyimide coating and a ceramic coating on the inner axial end face and the outer axial end face of the piston head to obtain an insert;
placing the insert into an injection mold, and injecting thermoplastic polyimide resin into the injection mold to obtain a blank;
after removing the stub bar of the blank, processing the outer diameter of the blank;
cleaning oil stains and flash on the surface to obtain the novel piston;
the novel piston comprises a piston body and a piston head, wherein the piston head is embedded in the end part of the piston body, and a thermoplastic polyimide layer and a ceramic coating are respectively arranged on the inner axial end surface and the outer axial end surface of the piston head;
the piston body is formed by injection molding of thermoplastic polyimide;
the piston head is made of pure aluminum.
2. The method of making a new piston as set forth in claim 1 wherein said method of making said piston head is a lathing method.
3. The method of manufacturing a novel piston as claimed in claim 1, wherein in the injection molding of the thermoplastic polyimide resin, the insert is heated to 200 to 250 ℃, the injection mold is preheated to 200 to 250 ℃ and the thermoplastic polyimide cylinder is preheated to 400 to 500 ℃.
4. The method for manufacturing a novel piston as claimed in claim 1 or 3, wherein the thermoplastic polyimide resin further contains carbon fibers and a solid lubricant, and the weight parts of the thermoplastic polyimide resin, the carbon fibers and the solid lubricant are respectively as follows: 100 parts, 15-30 parts and 0-5 parts.
5. The method of claim 4, wherein the solid lubricant is selected from one or both of molybdenum disulfide and polytetrafluoroethylene.
CN201711017101.XA 2017-10-26 2017-10-26 Novel piston and manufacturing method thereof Active CN107747519B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN107747519B true CN107747519B (en) 2020-09-15

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107842438A (en) * 2017-11-24 2018-03-27 无锡南理工新能源电动车科技发展有限公司 A kind of modified piston
CN107956591A (en) * 2017-11-24 2018-04-24 无锡南理工新能源电动车科技发展有限公司 A kind of high-performance method for making piston

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3134770A1 (en) * 1981-09-02 1983-03-17 Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt e.V., 5300 Bonn Piston for an internal combustion piston engine, especially for spark ignition and diesel engines
US5499572A (en) * 1993-08-26 1996-03-19 Cobble; Daniel L. Bi-tech piston
US20140272188A1 (en) * 2013-03-15 2014-09-18 Mahle International Gmbh Anti-friction coating to piston assembly
CN204591512U (en) * 2015-02-16 2015-08-26 泰州市优力克机械制造有限公司 Wear-resistant, high-temperature resistant piston
KR20180132662A (en) * 2016-04-05 2018-12-12 페더럴-모걸 파워트레인 엘엘씨 Piston with insulating insert and method of manufacturing the same
CN106279687B (en) * 2016-08-11 2018-08-31 中国科学院宁波材料技术与工程研究所 A kind of crystalline thermoplastic copolyimide resin and application

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