CN114074436B - Composite control arm for vehicle and forming method thereof - Google Patents
Composite control arm for vehicle and forming method thereof Download PDFInfo
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- CN114074436B CN114074436B CN202110745630.1A CN202110745630A CN114074436B CN 114074436 B CN114074436 B CN 114074436B CN 202110745630 A CN202110745630 A CN 202110745630A CN 114074436 B CN114074436 B CN 114074436B
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- control arm
- bushing
- carbon fiber
- injection molding
- die
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/345—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using matched moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection 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
- B29C45/1418—Injection 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 the inserts being deformed or preformed, e.g. by the injection pressure
- B29C45/14221—Injection 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 the inserts being deformed or preformed, e.g. by the injection pressure by tools, e.g. cutting means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G7/00—Pivoted suspension arms; Accessories thereof
- B60G7/001—Suspension arms, e.g. constructional features
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
Abstract
The invention discloses a composite material control arm for a vehicle and a forming process thereof, comprising a control arm body, wherein a first bushing and a second bushing are respectively embedded at two ends of the control arm body, the controller body is a thermoplastic carbon fiber composite material molding plate, and an injection molded plastic part is further arranged on the controller body; the molding process comprises the following steps: (1) preparing a thermoplastic carbon fiber composite board; (2) cutting into a mold; (3) compression molding and injection molding. According to the composite material control arm for the vehicle and the forming process thereof, the thermoplastic carbon fiber unidirectional tape and the thermoplastic plastic particles are used as raw materials, and the forming mode of combining mould pressing and injection molding is adopted, so that the thermoplastic composite material control arm is quickly prepared, the forming period is effectively shortened, the production efficiency is improved, and the plastic parts are synchronously formed on the control arm body by adding the thermoplastic injection molding process, so that the structural strength and the deformation resistance of the control arm are improved, and the service life of the control arm is prolonged.
Description
Technical Field
The invention relates to the field of vehicle accessories, in particular to a composite material control arm for a vehicle and a forming method thereof.
Background
The automobile control arm is a guiding and force transmitting element of an automobile suspension system, and the purpose of the automobile control arm is as follows: the wheel and the vehicle body are elastically connected together through the ball joint or the bushing respectively, and various forces acting on the wheel are transferred to the vehicle body, and meanwhile, the wheel is ensured to move along a certain track. To meet the above functions, the automobile control arm needs to have sufficient rigidity, strength and service life.
The traditional automobile control arm is made of metal, has large weight and high energy consumption, and does not meet the requirements of energy conservation and emission reduction. With the development of carbon fiber composites and their application in the automotive field, the industry has also attempted to use carbon fiber composites to make automotive control arms.
However, the existing composite control arms are mostly formed by using thermosetting materials as raw materials and adopting an SMC molding process or a prepreg molding process. As disclosed in chinese patent CN 108032696A, a control arm made of composite material for passenger car is disclosed, which uses a carbon fiber fabric laminated board as a control arm body, uses a PMI foam core material as an inner filling layer, uses a metal piece as an insert, and the molding method is as follows: the method comprises the steps of firstly preparing a front bushing prefabricated part, a rear bushing prefabricated part and a connector prefabricated part in a prefabricated mould respectively, then layering and fixing the prepared front bushing prefabricated part, rear bushing prefabricated part and connector prefabricated part with a carbon fiber fabric laminated plate and a PMI foam core material, and finally injecting thermosetting resin into the mould, and curing the mixture into a whole by adopting an HP-RTM process. Because the thermosetting resin needs to be completely infiltrated into the fiber to be cured under pressure, the infiltration process is slower, and the resin needs to be ensured not to react at a distance in the infiltration process so as not to cause insufficient infiltration. It can be seen that the existing control arm molded by the compression molding process using thermosetting resin has the following disadvantages: 1. the prior layering process is complex, the time consuming time is long, and the production period is long due to the long time required for effective permeation of the thermosetting resin; 2. the product is molded according to the mold structure, has no design and has poor deformation resistance.
Disclosure of Invention
The invention mainly solves the technical problem of providing the composite material control arm for the vehicle and the forming method thereof, and can solve the defects of the existing control arm in the aspects of forming process and product performance.
In order to solve the technical problems, the invention adopts the following technical scheme:
a composite material control arm for a vehicle comprises a control arm body, a first bushing and a second bushing, wherein the first bushing and the second bushing are positioned at two end parts of the control arm body; the controller body is a thermoplastic carbon fiber composite material molding plate, and is fixedly connected with an injection molded plastic part; the first bushing and the second bushing are embedded and fixed between the thermoplastic carbon fiber composite material molding plate and the plastic piece.
In a preferred embodiment of the invention, the plastic part comprises an outer frame, a reinforcing grid and a bushing connector; the reinforcing grid is integrally connected in the outer frame, and the bushing connector is integrally connected with the outer frame and the reinforcing grid and used for cladding and fixing the first bushing and the second bushing.
In a preferred embodiment of the present invention, the composite control arm for a vehicle further comprises a ball head, and the ball head is riveted or screwed with the other end of the control arm body.
In order to solve the technical problems, the invention also adopts a technical scheme that:
a molding method of a composite material control arm for a vehicle comprises the following steps:
(1) Preparing a thermoplastic carbon fiber composite board: using a thermoplastic carbon fiber unidirectional tape as a raw material, layering, and then sequentially heating, cooling and solidifying the layered thermoplastic carbon fiber unidirectional tape to obtain a thermoplastic carbon fiber composite board; the layering directions of the thermoplastic carbon fiber unidirectional tapes are 0 degree, 90 degrees, 45 degrees and-45 degrees, and the layering directions are alternately layered, wherein the proportion of each layering direction is 4:4:1:1;
(2) Cutting into a mold: cutting the thermoplastic carbon fiber composite board prepared in the step (1) according to the size of a control arm, preheating at 100-240 ℃, then placing the thermoplastic carbon fiber composite board and the first bushing and the second bushing into a forming die together, and fixing and closing the die; the die comprises an upper die and a lower die, wherein the upper die is provided with an injection molding opening, one side of the upper die, which faces the lower die, is provided with a groove matched with the plastic piece in shape and size, and the injection molding opening is communicated with the groove.
(3) Compression molding and injection molding: heating and pressurizing the die after die assembly in the step (2), after the die is heated to the die pressing temperature, running an injection molding machine melted with plastic particles to an injection molding opening of the die for injection molding, continuing die pressing after injection molding is finished, cooling and opening the die after die pressing is finished, and mounting a ball head to obtain the composite material control arm for the vehicle; the molding treatment process conditions are as follows: the molding temperature is 240-260 ℃, the pressure is 1-1.5 MPa, and the time is 2-3 min; the technological conditions of the injection molding are as follows: the temperature of the injection molding head is 250-260 ℃ and the injection molding time is 30-45 s.
Further, the thermoplastic carbon fiber unidirectional tape is a carbon fiber/polyamide unidirectional tape; the plastic particles are glass fiber/polyamide plastic particles.
The beneficial effects of the invention are as follows: according to the composite material control arm for the vehicle and the forming process thereof, the thermoplastic carbon fiber unidirectional tape and the thermoplastic plastic particles are used as raw materials, the forming mode of combining compression molding and injection molding is adopted, the injection of thermosetting resin is avoided, the rapid preparation of the thermoplastic composite material control arm is realized, the forming period is effectively shortened, the production efficiency is improved, and the plastic parts are synchronously formed on the control arm body due to the addition of the thermoplastic injection molding process, so that the structural strength and the deformation resistance of the control arm are improved, and the service life of the control arm is prolonged.
Drawings
FIG. 1 is a schematic perspective view of a control arm made of a composite material for a vehicle according to a preferred embodiment of the present invention;
FIG. 2 is a schematic view of the structure of the control arm body shown;
FIG. 3 is a schematic view of the structure of the plastic part shown;
FIG. 4 is a process flow diagram of a molding process for a control arm of a composite material for a vehicle in accordance with the present invention;
the components in the drawings are marked as follows: 1. the control arm body 2, a first bushing, a second bushing, a ball head 4, a plastic piece 5, a connecting hole 11, a 51, an outer frame 52, a reinforcing grid 53, a bushing connector 531, a first bushing connector 532 and a second bushing connector.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
Referring to fig. 1-4, an embodiment of the present invention includes:
example 1
The invention discloses a vehicle composite control arm integrating a metal insert, a thermoplastic carbon fiber composite material and a plastic material, which comprises a control arm body 1, wherein the control arm body 1 is a thermoplastic carbon fiber composite material molding plate and is a plane plate. The shape and structure of the control arm body 1 are the same as those of the existing control arm body, and the control arm body comprises three end parts, as shown in fig. 1, wherein two end parts are respectively embedded with metal inserts, namely a first bushing 2 and a second bushing 3, specifically, the first bushing 2 is horizontally placed, the second bushing 3 is vertically placed, and the third end part of the control arm body 1 is provided with three connecting holes 11 for riveting or screwing with a ball head 4, namely, the ball head 4 is installed after the control arm body 1 is molded. The control arm body 1 is also provided with a plastic part 5 by injection molding.
Specifically, the plastic part 5 includes an outer frame 51, a reinforcing mesh 52, and a bush connector 53; wherein, the outer frame 51 is located on the edge of the control arm body 1, and has the same shape structure as the control arm body 1, and the reinforcing grid 52 is integrally connected in the outer frame 51, which is helpful to improve the structural strength and deformation resistance of the control arm body 1, thereby improving the service life of the whole control arm; the bush connector 53 is integrally connected with the outer frame and the reinforcing grid, and is coated and fixed with the first bush 2 and the second bush 3, so that in the control arm forming process, the metal insert first bush 2 and the second bush 3 are integrally bonded and formed with the control arm body 1 and the plastic part 5, the first bush 2 and the second bush 3 are prevented from being bonded by adopting a cementing process, and the production efficiency is improved. Specifically, the first bush connector 531 covers the first bush 2, the second bush connector 532 covers the second bush 3,
the composite control arm for the automobile, which integrates the metal insert (the first bushing 2 and the second bushing 3), the thermoplastic carbon fiber composite material (the control arm body 1) and the plastic material, is formed in one step by adopting a mode of combining compression molding and injection molding, and the specific forming method comprises the following steps:
(1) Raw material selection and preparation: for the thermoplastic carbon fiber composite material, taking a thermoplastic carbon fiber unidirectional tape as a raw material, wherein the unidirectional tape is a carbon fiber/polyamide (CF/PA 6) unidirectional tape, and the mass percent of carbon fibers and polyamide is 1:1, a step of;
for the metal inserts, the first bush 2 and the second bush 3 are made of stainless steel.
For plastic materials, glass fiber/polyamide (GF/PA 66) plastic particles are used as raw materials, wherein the mass percentage of the glass fiber to the polyamide is 3:7.
Adding the plastic particles into a charging barrel of an injection molding machine, and melting the plastic particles, wherein the injection molding machine is divided into five heating sections from a charging end of the charging barrel to a melting section of an injection head, and the temperatures of the sections are 240 ℃, 250 ℃, 260 ℃ in sequence; heating and melting plastic particles in an injection molding machine for standby;
the molding die comprises an upper die and a lower die, wherein an injection molding opening is formed in the upper die, a groove matched with the plastic part 5 in shape and size is formed in one side of the upper die facing the lower die, the injection molding opening is communicated with the groove, and the upper die is used for injection molding of the plastic part 5;
(2) Preparing a thermoplastic carbon fiber composite board: alternately layering the thermoplastic carbon fiber unidirectional tapes according to layering directions of 0 degrees, 90 degrees, 45 degrees and-45 degrees, wherein the proportion of each layering direction is 4:4:1:1, heating the layered unidirectional tape layers to 260 ℃, keeping the temperature for 2 minutes, melting thermoplastic resin in the unidirectional tapes, penetrating each layer, bonding each layer, cooling and carrying out vacuum pressurizing treatment to obtain the thermoplastic carbon fiber composite board with the thickness of 6 mm;
(3) And (3) molding the thermoplastic carbon fiber composite board and the metal insert: heating and softening the thermoplastic carbon fiber composite board prepared in the step (2) in an infrared heating furnace at 240 ℃, putting the first lining 2 and the second lining 3 and the thermoplastic carbon fiber composite board after heating and softening into a preheated die, fixing, closing the die, and positioning the first lining 2 and the second lining 3 at corresponding positions of the thermoplastic carbon fiber composite board;
(4) Compression molding and injection molding: the mould in the step (3) is completely closed through a press, the temperature is quickly heated to 240 ℃, the mould is pressurized to 1MPa, mould pressing treatment is carried out, when the temperature of the mould is raised to the mould pressing temperature, an injection molding machine is operated to a glue injection port on the mould, molten plastic materials in a charging basket of the injection molding machine are injected from the injection port of the mould, the plastic piece 5 is formed, the injection time is 45 seconds, and after the injection molding is finished, the mould is cooled to below 80 ℃ and opened, so that the composite material control arm for the vehicle is obtained;
(5) And (3) removing burrs of the product subjected to the die opening in the step (5), and installing the ball head 4 at a corresponding position to obtain the automobile composite material control arm.
And performing performance test on the control arm with the existing steel structure and the control arm prepared by the embodiment.
And (3) safety coefficient test: reference is made to QCT 1127-2019 test standards.
The test results are shown in the following table:
| weight (kg) | Safety factor | |
| Steel structure control arm | 2.52 | 1.3 |
| Example 1 | 1.53 | 1.8 |
From the test results, the composite control arm of the invention achieves a weight reduction effect of 40% compared with a metal (steel structure) control arm.
Approximating theoretical Ec, ic=es, is according to the equivalent stiffness;
wherein Ec Is the equivalent modulus of the composite material, ic Is the cross-sectional moment of inertia of the composite material structure, es Is the equivalent modulus of the steel structure, and Is the cross-sectional moment of inertia of the steel structure; on the premise of meeting the requirement of equal stiffness replacement, the safety performance of the composite material control arm is improved by 38% compared with that of a metal (steel structure) control arm, and the composite material control arm has excellent structural strength and deformation resistance.
The invention has the following beneficial effects:
1. the thermoplastic material is used as a raw material, a molding process combining molding and injection molding is adopted, the period of the molding process is within 3min, the injection molding process is completed in the molding process, the time of injecting and uniformly penetrating thermosetting resin is saved, and the production efficiency is greatly improved;
2. the plastic part is added on the control arm body through an injection molding process, and the structural strength and the deformation resistance of the control arm body are improved through the structural design of the injection molding part, so that the safety performance and the service life of the whole control arm are improved.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (7)
1. A composite material control arm for a vehicle comprises a control arm body, a first bushing and a second bushing, wherein the first bushing and the second bushing are positioned at two end parts of the control arm body; the control arm is characterized in that the control arm body is a thermoplastic carbon fiber composite material molding plate, and an injection molded plastic part is fixedly connected to the control arm body; the first bushing and the second bushing are embedded and fixed between the thermoplastic carbon fiber composite material molding plate and the plastic piece; the plastic piece comprises an outer frame, a reinforcing grid and a bushing connector; the reinforcing grid is integrally connected in the outer frame, and the bushing connector is integrally connected with the outer frame and the reinforcing grid and is used for cladding and fixing the first bushing and the second bushing;
the molding method of the composite material control arm for the vehicle comprises the following steps:
(1) Preparing a thermoplastic carbon fiber composite board: using a thermoplastic carbon fiber unidirectional tape as a raw material, layering, and then sequentially heating, cooling and solidifying the layered thermoplastic carbon fiber unidirectional tape to obtain a thermoplastic carbon fiber composite board;
(2) Cutting into a mold: cutting and preheating the thermoplastic carbon fiber composite board prepared in the step (1) according to the size of a control arm, then putting the thermoplastic carbon fiber composite board and the first bushing and the second bushing into a forming die together, and fixing and closing the dies;
(3) Compression molding and injection molding: heating and pressurizing the die after die assembly in the step (2), after the die is heated to the die pressing temperature, running an injection molding machine melted with plastic particles to an injection molding opening of the die for injection molding, continuing die pressing after injection molding is finished, cooling and opening the die after die pressing is finished, and mounting a ball head to obtain the composite material control arm for the vehicle;
the die comprises an upper die and a lower die, wherein the upper die is provided with an injection molding opening, a groove matched with the plastic piece in shape and size is processed on one side of the upper die facing the lower die, and the injection molding opening is communicated with the groove.
2. The vehicle composite control arm of claim 1, further comprising a ball head riveted or screwed to the other end of the control arm body.
3. The composite control arm for a vehicle according to claim 1, wherein in the step (1), the thermoplastic carbon fiber unidirectional tapes are alternately laid in the ply directions of 0 °, 90 °, 45 ° and-45 °, and the ratio of each ply direction is 4:4:1:1.
4. The composite control arm for a vehicle according to claim 1, wherein in the step (2), the preheating temperature is 100 to 240 ℃.
5. The composite control arm for a vehicle according to claim 1, wherein in the step (3), the molding process conditions are: the molding temperature is 240-260 ℃, the pressure is 1-1.5 MPa, and the time is 2-3 min.
6. The composite control arm for a vehicle according to claim 1, wherein in the step (3), the injection molding process conditions are as follows: the temperature of the injection molding head is 250-260 ℃ and the injection molding time is 30-45 s.
7. The vehicle composite control arm of claim 1 wherein said thermoplastic carbon fiber unidirectional tape is a carbon fiber polyamide unidirectional tape; the plastic particles are glass fiber polyamide plastic particles.
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| CN202110745630.1A CN114074436B (en) | 2021-07-01 | 2021-07-01 | Composite control arm for vehicle and forming method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110745630.1A CN114074436B (en) | 2021-07-01 | 2021-07-01 | Composite control arm for vehicle and forming method thereof |
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| CN114074436B true CN114074436B (en) | 2023-09-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115782245B (en) * | 2023-02-14 | 2023-04-11 | 中南大学 | Rapid forming method of continuous fiber reinforced thermoplastic composite material composite member |
| CN116214777B (en) * | 2023-05-10 | 2023-07-18 | 宁海县第一注塑模具有限公司 | Injection mold for forming carbon fibers |
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| CN113043528A (en) * | 2021-02-09 | 2021-06-29 | 博戈橡胶塑料（株洲）有限公司 | Control arm forming method and control arm |
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| DE102014214827A1 (en) * | 2014-07-29 | 2016-02-04 | Zf Friedrichshafen Ag | Handlebar and method for its production |
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| KR20190056183A (en) * | 2017-11-16 | 2019-05-24 | (주)엘지하우시스 | Vehicle part, control arm, and manufacturing method of the same using in-monding forming process |
| CN108032696A (en) * | 2017-11-17 | 2018-05-15 | 康得复合材料有限责任公司 | passenger car composite material control arm |
| KR20200079030A (en) * | 2018-12-24 | 2020-07-02 | 주식회사 티앤지 | Control arm constituting vehicle's suspension system and method for manufacturing the control arm |
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| CN114074436A (en) | 2022-02-22 |
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