CN108050246B - High-performance carbon fiber composite piston rod and preparation method thereof - Google Patents
High-performance carbon fiber composite piston rod and preparation method thereof Download PDFInfo
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- CN108050246B CN108050246B CN201711279202.4A CN201711279202A CN108050246B CN 108050246 B CN108050246 B CN 108050246B CN 201711279202 A CN201711279202 A CN 201711279202A CN 108050246 B CN108050246 B CN 108050246B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses a high-performance carbon fiber composite piston rod, which comprises a piston joint, a piston rod main body and a thrust rod joint which are sequentially connected through pins from left to right, wherein the piston rod main body consists of an inner piston body and an outer piston body sleeved outside the inner piston body, contact type connection is arranged between the inner surfaces and the outer surfaces of the piston joint and the thrust rod joint, the inner surfaces of the piston joint and the thrust rod joint are conical, and the cone angle is 2-45 degrees. According to the invention, by reasonably designing the fiber direction of the composite material and combining the novel connection mode of matching the double-sided small-angle inclined plane with the embedded pin, the connection strength and reliability of the adapter and the rod body are greatly improved, and meanwhile, the weight of the whole structure of the piston rod is effectively reduced.
Description
Technical Field
The invention relates to the field of material preparation, in particular to a high-performance carbon fiber composite piston rod and a preparation method thereof.
Background
The actuating cylinder is also called a hydraulic cylinder, is a common executing element in a hydraulic transmission system, and is an energy conversion device for realizing the linear reciprocating motion or less than 360-degree rotation of a working mechanism. Actuators are widely used in aircraft devices such as landing gear, flaps, thrust reversers, etc., and in trucks for large passenger vehicles. The actuating cylinder mainly comprises a cylinder body, a piston rod, an end cover and the like, wherein the piston rod is a main moving part.
At present, most of piston rods are made of steel, and with the continuous improvement of the requirement of lightweight airplanes and the rise of new energy automobiles, the weight reduction requirement on automobile parts is severe, and the application of the traditional steel piston rod is greatly limited due to the large weight. The industry is exploring the use of high specific stiffness, specific strength carbon fiber composite materials for the piston rod.
In "pressure cylinder with composite piston rod and method for producing a composite piston rod" (CN101529101B), the promulgated company of netherlands adopts a scheme that the fiber direction of the composite material used for the piston rod is almost parallel to the longitudinal axis, and the piston rod is of a hollow structure. The scheme has a certain effect under the condition of less tension and compression loads, but for components such as the piston rod which need to bear ten thousand fatigue loads, the almost same direction (more than 4 layers) of fibers can enable epoxy resin of the composite piston rod to be easily cracked, and the whole piston rod can be failed. In addition, the closing parts at the two ends of the piston rod and the rod piece adopt a cylindrical surface cementing mode in the scheme. Since the interlaminar shear strength of the composite material is lower than that of the adhesive, this property makes it difficult to avoid, even if the adhesive performance is increased, the destruction of the first layer of composite material against the closure prior to the adhesive, resulting in the detachment of the closure from the stem.
However, these techniques have the following problems:
(1) because the end of the piston rod needs to be connected with other parts, and metal adapters need to be arranged at two ends of the piston rod, the metal adapters and the rod body adopt a single-sided cementing mode in the general scheme, and the piston rod is easy to lose efficacy in the reciprocating motion process.
(2) The connecting part of a common metal joint and a composite material rod body is exposed outside the piston rod, so that the appearance quality is influenced.
Disclosure of Invention
In order to solve the problems, the invention provides the high-performance carbon fiber composite piston rod and the preparation method thereof, the fiber direction of the composite material is reasonably designed, and the novel connection mode that the double-sided small-angle inclined plane is matched with the embedded pin is combined, so that the connection strength and reliability of the adapter and the rod body are greatly improved, and meanwhile, the weight of the whole structure of the piston rod is effectively reduced.
The invention is realized by the following technical scheme.
The piston rod comprises a piston joint, a piston rod main body and a thrust rod joint which are sequentially connected through pins from left to right, wherein the piston joint, the piston rod main body and the thrust rod joint are arranged, the piston rod main body is composed of an inner piston body and an outer piston body sleeved outside the inner piston body, contact connection is arranged between the inner surfaces and the outer surfaces of the piston joint and the thrust rod joint, the inner surfaces of the piston joint and the thrust rod joint are conical, and the cone angle is 2-45 degrees.
Preferably, the number of the pins is 4-10.
Preferably, the inner piston body is of a solid structure, the outer surface of the outer piston body is smooth, and the roughness is better than 0.8 μm.
Preferably, the top of the inner profile of the piston joint and the top of the inner profile of the thrust rod joint are respectively provided with 6 glue overflow holes with the diameter of phi 4-phi 10.
Preferably, the connecting rod has an outer diameter of not more than 40mm and a weight of not more than 3Kg, and can withstand a tensile force of 120KN without breaking.
The invention also provides a preparation method of the high-performance carbon fiber composite piston rod, which comprises the following steps:
step 1, selecting proper carbon fibers and epoxy resin to prepare a prepreg according to the bearing condition and the use temperature of the piston rod;
step 2, using a pipe coiling method, pre-compacting prepreg by using a vacuum bag, and then coiling the inner piston body at an axial angle of 0 degree and +/-45 degrees according to the fiber direction, wherein the ratio of the pre-compacting prepreg to the inner piston body is 2-4: 1;
step 6, punching holes on the inner piston body according to pin holes in the middle of the piston joint and the thrust rod joint, wherein the diameter of the holes is consistent with that of the holes on the joints;
step 7, polishing the surface of the pin by using abrasive paper, coating an adhesive after cleaning, and inserting the pin into the inner piston body;
step 8, preparing an outer piston body on the inner piston body in a winding forming mode, wherein the direction of a winding fiber layer is 0 degree and +/-45 degrees in the axial direction, and the ratio of the winding fiber layer to the winding fiber layer is 2-4: 1; putting the wound support rod into an oven for curing, wherein the curing temperature is 130 ℃, and the curing time is 3 hours;
and 9, polishing the surface of the solidified piston rod until the roughness is better than 0.8 μm.
The invention has the following beneficial effects:
the high-performance carbon fiber composite piston rod provided by the invention fully utilizes the characteristic of anisotropy of the carbon fibers, the arrangement direction of the fibers is as consistent as possible with the force bearing direction of the connecting rod, the fibers are integrally continuous by using a continuous winding method without splicing, and the use efficiency of the fibers is improved.
The high-performance carbon fiber composite piston rod provided by the invention has the weight not more than 3Kg, can resist the high temperature of 100 ℃, can bear the tensile and compression fatigue of 120KN for more than 1 ten thousand times, and can be used as a light-weight high-performance piston rod.
According to the invention, by improving the angle distribution of the carbon fibers and using double-sided small-angle inclined plane cementation to replace a double fixing mode of cylindrical surface cementation and mechanical pins, resin cracking in the composite material rod body and early separation of the tail end closing part can be avoided, the service life of the piston rod is greatly prolonged, no connecting trace exists on the outer surface, and the performance and the apparent quality are very excellent.
Drawings
Fig. 1 is a schematic view of a high-performance carbon fiber composite piston rod provided by the invention.
Fig. 2 is a schematic view of the carbon fiber inner piston body provided by the present invention.
Fig. 3 is a schematic view of the carbon fiber outer piston body provided by the present invention.
Fig. 4 is a schematic view of a piston joint provided by the present invention.
Figure 5 is a schematic view of a thrust rod joint provided by the present invention.
Detailed Description
The following examples illustrate the invention in detail: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
As shown in fig. 1-5, an embodiment of the present invention provides a high performance carbon fiber composite piston rod, which includes a piston joint 1, a piston rod main body and a thrust rod joint 2 sequentially connected by a pin 5 from left to right, wherein the piston rod main body is composed of an inner piston body 3 and an outer piston body 4 sleeved outside the inner piston body 3, contact connections are provided between inner and outer surfaces of the piston joint 1 and the thrust rod joint 2, inner surfaces of the piston joint 1 and the thrust rod joint 2 are both tapered, and a taper angle is 2 ° to 45 °. The number of the pins 5 is 4-10. The inner piston body 3 is of a solid structure, the outer surface of the outer piston body 4 is smooth, and the roughness is better than 0.8 mu m. The top parts of the inner profiles of the piston joint 1 and the thrust rod joint 2 are respectively provided with 6 glue overflow holes with the diameter phi of 4-phi 10. The outer diameter of the connecting rod is not more than 40mm, the weight of the connecting rod is not more than 3Kg, and the connecting rod can bear 120KN of tensile force without damage.
The invention also provides a preparation method of the high-performance carbon fiber composite piston rod, which comprises the following steps:
step 1, selecting proper carbon fibers and epoxy resin to prepare a prepreg according to the bearing condition and the use temperature of the piston rod;
step 2, using a pipe coiling method, pre-compacting prepreg by using a vacuum bag, and coiling the inner piston body 3 at an axial angle of 0 degree and +/-45 degrees according to the fiber direction, wherein the ratio of the pre-compacting prepreg to the inner piston body is 2-4: 1;
step 6, punching holes on the inner piston body 3 according to pin holes in the middle parts of the piston joint 1 and the thrust rod joint 2, wherein the diameter of the holes is consistent with that of the holes on the joints;
step 7, polishing the surface of the pin by using abrasive paper, coating an adhesive after cleaning, and inserting the pin into the inner piston body 3;
step 8, preparing an outer piston body on the inner piston body in a winding forming mode, wherein the direction of a winding fiber layer is 0 degree and +/-45 degrees in the axial direction, and the ratio of the winding fiber layer to the winding fiber layer is 2-4: 1; putting the wound support rod into an oven for curing, wherein the curing temperature is 130 ℃, and the curing time is 3 hours;
and 9, polishing the surface of the solidified piston rod until the roughness is better than 0.8 μm.
This detailed description
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 (6)
1. The preparation method of the high-performance carbon fiber composite piston rod is characterized by comprising the following steps of:
step 1, selecting proper carbon fibers and epoxy resin to prepare a prepreg according to the bearing condition and the use temperature of the piston rod;
step 2, using a pipe coiling method, pre-compacting prepreg by using a vacuum bag, and then coiling the inner piston body (3) at an axial angle of 0 degree and +/-45 degrees according to the fiber direction, wherein the ratio of the two is 2-4: 1;
step 3, placing the inner piston body into an oven for curing, wherein the curing temperature is 130 ℃, and the curing time is 2 hours;
step 4, performing phosphoric acid anodizing treatment on the inner and outer surfaces of the piston joint (1) and the thrust rod joint (2);
step 5, coating adhesives on the inner surfaces of the piston joint (1) and the thrust rod joint (2) on a positioning tool, and bonding the inner piston joint (1) and the thrust rod joint with the inner piston body (3);
step 6, punching holes on the inner piston body (3) according to pin holes in the middle parts of the piston joint (1) and the thrust rod joint (2), wherein the diameter of the holes is consistent with that of the holes on the joints;
step 7, polishing the surface of the pin by using abrasive paper, coating an adhesive after cleaning, and inserting the inner piston body (3);
step 8, preparing an outer piston body on the inner piston body in a winding forming mode, wherein the direction of a winding fiber layer is 0 degree and +/-45 degrees in the axial direction, and the ratio of the winding fiber layer to the winding fiber layer is 2-4: 1; putting the wound support rod into an oven for curing, wherein the curing temperature is 130 ℃, and the curing time is 3 hours;
and 9, polishing the surface of the solidified piston rod until the roughness is better than 0.8 μm.
2. The high-performance carbon fiber composite piston rod is prepared by the preparation method of the high-performance carbon fiber composite piston rod according to claim 1, and is characterized in that the piston rod comprises a piston joint (1), a piston rod main body and a thrust rod joint (2) which are sequentially connected through a pin (5) from left to right, the piston rod main body comprises an inner piston body (3) and an outer piston body (4) sleeved outside the inner piston body (3), contact type connection is arranged between the inner surface and the outer surface of the piston joint (1) and the inner surface and the outer surface of the thrust rod joint (2), the inner surfaces of the piston joint (1) and the inner surface of the thrust rod joint (2) are conical, and the cone angle is 2-45 degrees.
3. The high-performance carbon fiber composite piston rod as claimed in claim 2, wherein the number of the pins (5) is 4-10.
4. The high-performance carbon fiber composite piston rod as claimed in claim 2, wherein the inner piston body (3) is of a solid structure, and the outer surface of the outer piston body (4) is smooth and has a roughness of better than 0.8 μm.
5. The high-performance carbon fiber composite piston rod as claimed in claim 2, wherein the top of the inner profile of the piston joint (1) and the top of the inner profile of the thrust rod joint (2) are respectively provided with 6 glue overflow holes with a diameter of Φ 4- Φ 10.
6. The high performance carbon fiber composite piston rod as claimed in claim 2, wherein said piston rod has an outer diameter of not more than 40mm and a weight of not more than 3Kg, and can withstand a tensile force of 120KN without breaking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711279202.4A CN108050246B (en) | 2017-12-06 | 2017-12-06 | High-performance carbon fiber composite piston rod and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711279202.4A CN108050246B (en) | 2017-12-06 | 2017-12-06 | High-performance carbon fiber composite piston rod and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108050246A CN108050246A (en) | 2018-05-18 |
| CN108050246B true CN108050246B (en) | 2020-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711279202.4A Active CN108050246B (en) | 2017-12-06 | 2017-12-06 | High-performance carbon fiber composite piston rod and preparation method thereof |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2469605A1 (en) * | 1979-11-08 | 1981-05-22 | Rech Meca Appliquee | CONNECTING ROD OR SIMILAR OBJECT |
| JPS62215104A (en) * | 1986-03-17 | 1987-09-21 | Hitachi Constr Mach Co Ltd | Cylinder device |
| DE3904644C1 (en) * | 1989-02-16 | 1990-03-29 | Hermann Hemscheidt Maschinenfabrik Gmbh & Co, 5600 Wuppertal, De | Hydraulic pit prop |
| US5101556A (en) * | 1990-12-17 | 1992-04-07 | Allied-Signal Inc. | Method of manufacturing a piston |
| DE10202455C1 (en) * | 2002-01-22 | 2003-10-16 | Zf Sachs Ag | Piston rod e.g. for a vibration damper has a core of a plastics material with carbon fibers, in a press fit within a metal tube, and sealed against the entry of air |
| DE102006047412B4 (en) * | 2005-10-06 | 2011-04-21 | Technische Universität Dresden | Bar-shaped fiber composite structure with load introduction elements and method for the production |
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2017
- 2017-12-06 CN CN201711279202.4A patent/CN108050246B/en active Active
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