KR101881928B1 - the composite shaft manufacturing system with braider for vehicle and the manufacturing method of composite shaft for vehicle and the composite shaft for vehicle thereof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automotive composite shaft manufacturing system including a braiding machine and a method for manufacturing a composite shaft for an automobile and a composite shaft for an automobile manufactured by the manufacturing method, ; A conveying unit including conveying means for moving the mandrel up and down and left and right, the mandrel being moved by the conveying means and knitting the preform in the mandrel by the baling machine; A molding machine for thermally forming a preform knitted in a mandrel to make hollow internal composite tubes; A collection and de-molding section for collecting the composite tube and mandrel made in the molding machine and removing the mandrel from the composite tube; A rearrangement unit arranged to fit the designed dimensions of the demolded composite tube; A manufacturing system for an automotive composite shaft including an assembling portion for applying a binder to one end or both ends of a composite tube to assemble a connecting port is constructed and a connecting tube is formed at one end or both ends of a composite tube in which a preform of a mandrel is thermoformed and cured By using the composite shaft as a binder and applying the composite shaft to a propeller shaft and a drive shaft of an automobile, it is light in weight, strong in strength, resistant to twisting and torque, and uniform in physical properties in the longitudinal direction and circumferential direction Eccentricity due to high-speed rotation can be prevented.

Description

TECHNICAL FIELD [0001] The present invention relates to an automotive composite shaft manufacturing system including a braiding machine, an automotive composite shaft manufacturing method, and a vehicle composite shaft manufactured by the manufacturing method. the composite shaft for vehicle thereof}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile composite shaft manufacturing system including a braiding machine, a method for manufacturing a composite shaft for an automobile and a composite shaft for an automobile manufactured by the manufacturing method, wherein a preform is knitted by a braiding machine, A composite shaft is bonded to a molding die of a molding machine to produce a composite tube in which a preform is thermoformed and hardened with a resin. A composite shaft is formed by bonding a connector to one end or both ends of the composite tube with a binder. As a drive shaft, it is lightweight, has excellent strength, is resistant to twisting and torque, and uniform in physical properties along the length and circumferential directions, thereby preventing eccentricity due to high-speed rotation.

Generally, automobiles are composed of various parts. Among them, a shaft of an automobile has a function of transmitting the power of an engine to a wheel, and a shaft applied to an automobile includes a propeller shaft and a drive shaft. Among them, a propeller shaft The shaft of the general propeller shaft and the shaft of the differential gear (differential gear) are separated from each other, and the separated two shafts are connected to each other through a joint The drive shaft is a shaft that transmits power from the differential gear (final drive) to the wheels. The drive shaft is driven by a constant velocity joint and a spline or the like at a rotational speed or torque Power transmission without schedule .

The shaft for an automobile such as a propeller shaft, a drive shaft, and the like is made of hollow hollow shaft. The both ends of the shaft of the automobile are constituted by various connecting members such as a constant velocity joint, a universal joint, and a spline.

Recently, a variety of composite materials have been applied. For example, Korean Patent Application No. 2002-0040874 discloses a method of joining a composite material tube and a metal material connection portion by a hot press-fitting method , The contents of which are incorporated herein by reference.

In Korean Patent Application No. 2007-0081060, auxiliary coaxial and eccentric shafts are prepared, joined to the involute spline at both ends of the eccentric shaft, and bonded to the outer surface thereof with an adhesive, a woven fiber reinforced composite material, a resin, And a manufacturing method of a composite drive shaft is described in which a composite shaft is manufactured by using a composite material and then an auxiliary shaft and an eccentric shaft are removed to manufacture a drive shaft.

Korean Patent Application No. 2010-0109432 discloses a method of winding a glass fiber bundle impregnated with a thermosetting resin on both ends of a mandrel to form both ends of the tube and winding and curing a bundle of carbon fibers impregnated with a thermosetting resin throughout the mandrel The contents of 'Propeller shaft for automobile and its manufacturing method' are posted.

Even if the material of the automotive vehicle shaft is a composite material (hollow shaft portion) as in the above-described invention, since the conventional materials and components are applied to the connecting port, integration of the connecting port and the shaft is important. As described above, a hot press method is applied as in the first embodiment, or a composite material is wound around a certain portion of the connector as in the second and third embodiments.

However, since the automobile shaft rotates at high speed while the automobile shaft is repeatedly and continuously subjected to twisting (torque), there is a high possibility that the joint and the shaft are separated from each other due to the twist.

In addition, the shafts of the second and third inventions wind the glass fiber or the carbon fiber and manufacture the shaft of the composite material by hardening the thermosetting resin. There are various ways (directions) of winding the glass fiber or the carbon fiber, As a result, the thickness of the composite material in the circumferential direction or the longitudinal direction of the shaft is not uniform due to the winding process at a designed width or multiple turns of the fiber or narrow band material. Or a crack or breakage of a weak part is likely to occur.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a bending machine for forming a braid by mutual crossing of fibers wound on a bobbin. A shaft-shaped mandrel and conveying means for moving the mandrel upward, downward, leftward and rightward, the conveying portion knitting the mandrel by the baling machine while the mandrel is moved by the conveying means; A molding machine for thermally forming a preform knitted in a mandrel to make hollow internal composite tubes; A collection and de-molding section for collecting the composite tube and mandrel made in the molding machine and removing the mandrel from the composite tube; A rearrangement unit arranged to fit the designed dimensions of the demolded composite tube; A manufacturing system of a composite material shaft for an automobile including a composite part shaft for applying a binder to one end or both ends of the composite material tube and assembling a connecting port is constituted to manufacture an automotive composite material shaft having a structure in which a connector is integrally formed with a composite material tube in which a preform is formed , The composite shaft is applied to a propeller shaft and a drive shaft of an automobile, it is lightweight, has excellent strength, is resistant to twisting and torque, and has uniform physical properties along its length and circumferential direction. do.

In addition, the composite tube has a circular cross-section along the longitudinal direction, a key seat is formed at one end or both ends of the composite tube, and a fitting groove is formed in the surface of the coupling hole so that the composite tube is inserted. So that the fitting groove of the connecting hole is forcedly fitted into the composite tube and the composite shaft is integrated by the combination of the key and the key seat so that the composite tube and the connecting hole are prevented from slipping even when the composite shaft is rotated at a high speed .

Alternatively, the composite tube may be formed of a body having a circular cross section and a coupling protrusion at both ends of the main body, wherein the coupling protrusion is formed in a polygonal cross section, the coupling groove is formed with a fitting groove corresponding to the cross- The composite shaft is integrated with the coupling of the tube connecting protrusions into the fitting grooves of the connector so that slippage of the composite tube and connector is prevented even at high speed rotation of the composite shaft.

As described above, according to the present invention, a preform is knitted with a braiding machine and a mandrel is bonded to a molding die of a molding machine to produce a composite tube in which a preform is thermoformed and hardened with a resin. At one end or both ends of the composite tube, And the composite shaft is used as a propeller shaft and a drive shaft of an automobile. Therefore, the composite shaft is lightweight, has excellent strength, is resistant to twisting and torque, and has uniform physical properties along the longitudinal and circumferential directions Therefore, eccentricity due to high-speed rotation can be prevented.

In addition, the composite tube and the coupling hole of the composite shaft are coupled with each other by interference fit, and the combination of the key of the composite tube and the key of the coupling has an effect of preventing slip occurrence even at high speed rotation of the composite shaft.

Alternatively, a polygonal connection protrusion may be formed at one end or both ends of the composite tube of the composite shaft, and a fitting groove corresponding to the coupling protrusion may be formed in the coupling hole. By the coupling of the coupling member of the composite tube and the fitting groove of the coupling shaft, There is an effect of preventing slip occurrence even at high speed rotation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view showing a braiding machine, a conveying unit, and a molding machine according to an automotive composite material manufacturing system including a braiding machine of the present invention. FIG.
Fig. 2 is a schematic side view showing a conveying portion and a molding machine according to an automotive composite material manufacturing system including a braiding machine of the present invention. Fig.
3 (A) and 3 (B) are front views showing an operating state of a molding machine of an automotive composite shaft manufacturing system including a braiding machine according to the present invention.
FIGS. 4C and 4D are cross-sectional views showing a state in which a constant-type composite tube of a molding machine is molded according to an automotive composite shaft manufacturing system including a braiding machine of the present invention. FIG.
5 (E) and 5 (F) are sectional views showing a state of molding a multistage composite tube of a molding machine according to an automotive composite shaft manufacturing system including a braiding machine of the present invention.
FIG. 6 is an assembled perspective view showing a combined state of the multi-end composite tube and the internal connector of the automotive composite shaft according to the present invention. FIG.
7 (G) and 7 (H) are an assembled perspective view and a cross-sectional view showing a state in which a composite composite tube of an automotive composite shaft according to the present invention is coupled to an external connector.
8 (M) and 8 (N) are perspective views showing a composite shaft according to the present invention.
9 is a flowchart according to a method of manufacturing an automotive composite shaft of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile composite shaft manufacturing system including a braiding machine, a method for manufacturing a composite shaft for an automobile and a composite shaft for an automobile manufactured by the manufacturing method, wherein a preform is knitted by a braiding machine, A composite shaft is bonded to a molding die of a molding machine to produce a composite tube in which a preform is thermoformed and hardened with a resin. A composite shaft is formed by bonding a connector to one end or both ends of the composite tube with a binder. As a drive shaft, it is lightweight, has excellent strength, is resistant to twisting and torque, and uniform in physical properties along the length and circumferential directions, thereby preventing eccentricity due to high-speed rotation.

First, an automotive composite shaft manufacturing system including a braiding machine according to the present invention will be described first, and a method for manufacturing an automotive composite shaft will be described. First, an automotive composite shaft manufacturing system including a braiding machine includes a braiding machine 100 The manufacturing process of the automotive composite material shaft will be described with reference to the manufacturing system of the composite material shaft of the automobile and the manufacturing process of the composite material shaft of the automobile.

First, as shown in FIG. 1, a braiding machine (braider) 100 includes a plurality of carriers 110 (or a yarn carrier, a fiber feeder, a fiber wound bobbin, And a slider 130 on which the carrier 110 is mounted (on the one hand, the carrier and the slider are not distinguished from each other, and the carrier on which the yarn carrier is mounted is also referred to as a carrier) (Braid or braided sleeve) having a predetermined angle with the mutual twist of the fibers 121 wound on each of the bobbins 120 by guiding them in a regular direction along the track, And a type of the braiding machine 100 is a bi-Excel braiding machine (two-dimensional braiding machine) and a three-dimensional braiding machine.

More specifically, a biaxial braiding machine is a braiding machine in which fibers are crossed with diagonal lines to knit a braid, and a three dimensional braiding machine is a braille machine in which a plurality of carriers are arranged in a square (Over) braiding machine, an interlock braiding machine, or the like in which a plurality of carriers are arrayed in a circle, and the like. Such a three-dimensional braiding machine has a structure in which a plurality of fibers are integrally formed in three dimensions Blade layer).

The type of the braiding machine 100 according to the form in which the braiding machine 100 is woven (knitted) is further described as follows. By the structure in which the carriers are arranged horizontally with respect to the floor, And as shown in Fig. 1, by the structure in which the carrier 110 is arranged perpendicularly to the floor, the braid to be woven is horizontally woven in parallel to the floor, and the horizontal braiding There is a dinghy.

The braiding machine 100 basically comprises two fibers 121 which are twisted at a certain angle and cross each other in accordance with the type of the direction in which the fibers 121 intersect, As shown in Fig. 1, the tri-Excel Braider 100 is formed by adding fibers of an excel yarn 141 passing through the centers of the two crossing fibers 121, Fibers 121 and 141 form three axes.

The various braiding machines 100 exemplified above can be applied to the automotive composite shaft manufacturing system according to the present invention, and the content and description of the braiding machine 100 are general and will not be described in detail.

On the other hand, the types of the fibers 121 and 141 applied to the braiding machine 100 include high strength fibers such as carbon fiber, glass fiber, and aramid fiber, or high strength fibers such as a toe prepreg Prepreg, tow prepreg) are applied.

2 and 3, the conveying portion includes a mandrel 200 and a conveying means 300, and the mandrel 200 is used for forming a preform 500 knitted by braiding. The outer shape of the mandrel 200 may be a circular cross-section, or a variety of other shapes may be used. The outer cross-sectional size of the mandrel 200 may be, for example, The preforms 500 are formed to be equal to or smaller than the smallest inner diameter of the composite tubes 600 and 600 'formed by molding the preforms 500 so that the preforms 500 are easily demoulded after molding.

3 and 4, a connector 210 is formed at one end of the mandrel 200. The connector 210 is configured such that the transfer means 300 described later holds the mandrel 200, Lt; RTI ID = 0.0 > 200 < / RTI >

Therefore, the mandrel 200 has a structure in which air is injected and the air is discharged in the circumferential direction. To this end, the mandrel 200 forms an empty air passage 200a along the longitudinal direction, and the air passage 200a The air inlet 200b is connected to the connector 210 through a connection to the connector 210. The air inlet 200b is connected to the connector 210, Blow molding (blow molding) using the mandrel 200 having such a structure facilitates air injection and discharge of the mandrel 200 through the connector 210, and blow molding is described in detail in the molding part do.

The conveying means 300 is a device for moving the mandrel 200. The conveying means 300 does not move the mandrel 200 directly but moves the mandrel 200 by holding the connector 210 of the mandrel 200 The transfer means 200 may be configured to move the mandrel 200 by means of a motor or a cylinder or may be constituted by a structure in which a robot (articulated robot) is used as the transfer means 300, as shown in FIGS. 1 and 2 So that the robot arm can be configured to move the mandrel 200 by holding the connector 210.

If the conveying means 300 is configured as a robot, collecting the braided mandrels 200, conveying the braiding to the molding machine 400, minimizing the interference with the conveyance of the mandrel 200, It is easy to collect the molded mandrel 200 and the like.

Briefly describing the production (weaving, knitting) of the preform 500 by the braiding machine 100 and the conveying unit, the mandrel 200 supported by the conveying means 300 is placed in the braiding machine 100, And the conveying means 300 pushes or pulls the mandrel 200 according to the speed at which the braid is knitted. When the knitting of the braid at the designed length is finished, The preforms 500 are manufactured by cutting the fibers 121 and 141 connected to the preforms 200 by cutting the fibers manually or by cutting the fibers into separate cutters for cutting the fibers, The mandrel 200 is transferred to the next molding machine 400 by the transfer means 300.

Next, the molding machine 400 is an apparatus for molding the composite tube 600 or 600 'by receiving the mandrel 200 having the preform 500. The molding machine 400 has a molding die 410 And the inside of the combined forming molds 410 and 420 has an outer shape of the composite tube 600 or 600 'to be manufactured.

Meanwhile, the composite tubes 600 and 600 'to be manufactured have a hollow structure along the longitudinal direction, and the composite tubes 600 and 600' have a constant-shaped composite tube 600 'and multi- Type composite tube 600. As shown in FIG. 7, the constant-type composite tube 600 'is formed in a circular shape with a constant section along the longitudinal direction.

6, the multi-stage composite tube 600 is composed of a main body and coupling protrusions 610 at both ends thereof. The main body is in the shape of a shaft, and the coupling protrusions 610 are circular, The connecting protrusions 610 may be formed to have the same size in the longitudinal direction, or the connecting protrusions 610 may be formed in a size larger or smaller than the main body. The connecting protrusion 610 may have a cross section that increases from the main body to the end, or the cross section of the connecting protrusion 610 decreases from the main body to the end as shown in FIG.

3 to 5, the mandrel 200 including the preform 500 is placed inside the molding dies 410 and 420 of the molding machine 400, and the molding dies 410 and 420 After the air is injected into the mandrel 200, the resin is subjected to RTM (Resin Transfer Molding) molding or autoclave molding while blow molding (blow molding) is performed.

In the RTM (Resin Transfer Molding) molding, a thermosetting resin or a thermoplastic resin is injected into the molding dies 410 and 420 to thermally cure the molding molds 410 and 420, and the autoclave molding is performed using a tow prepreg The preforms 500 knitted with the prepregs are used to heat and thermoform the molding dies 410 and 420 including the mandrels 200.

The air injected into the mandrel 200 by the blow molding causes the preform 500 to be closely adhered to the inner surfaces of the molding dies 410 and 420 to be formed into the structure of the composite tubes 600 and 600 ' Thereby forming composite tubes 600 and 600 'which are cured by molding.

The collection and disassembling unit (not shown) collects the composite tubes 600 and 600 'molded in the molding machine and demolds the composite tubes 600 and 600' And the molded composite tubes 600 and 600 'are collectively disposed at different positions and the mandrel 200 is removed from the composite tubes 600 and 600' The composite tubes 600 and 600 'are collected and demoulded by a method in which the mandrel 200 of the molding machine 400 is first removed while being removed and the composite tubes 600 and 600' .

The composite tubes 600 and 600 'having the hollow interior are hollow tubes and the composite tubes 600 and 600' may be formed of a continuous composite tube 600 'and a multi- (600) has a constant circular cross-section along the longitudinal direction, and the multi-stage composite tube (600) has a shaft-like body and a cross-section that is smaller or larger than the body at both ends thereof The connection member 610 is formed of a connecting protrusion 610.

The rear ends of the composite tubes 600 and 600 'that are separated from each other are aligned with the dimensions of the composite tubes 600 and 600', and a key seat 620 is formed at one end or both ends of the composite tubes 600 and 600 ' The ends of the composite tubes 600 and 600 'are cut according to the designed dimensions and the edges and the surfaces are arranged. If necessary, the key tubes 620 are formed at both ends of the composite tubes 600 and 600' When the end of the composite tube 600 or 600 'has a circular cross section, the key seat 620 is always formed.

Finally, the assembly part (not shown) assembles the composite tube 600 (600 ') and the connector 700 to manufacture the composite shaft 800.

On the other hand, the connector 700 is a part used for connection such as a constant velocity joint, a universal joint (yoke), a spline, and the like, which are formed at both ends of an automobile shaft. The connector 700 is made of metal, (Not shown) having an insertion fit groove 710 having a fitting groove formed at the center of the fitting hole 700, an outer fitting groove 710 having an insertion groove formed at the outer circumference of the coupling hole 700, (720).

6, the inner fitting groove 710 is a fitting groove formed at a central portion of one end of the coupling hole 700, and the fitting groove is formed in the coupling protrusion 610 of the multi-stage composite tube 600, When the key seat 620 is formed in the coupling protrusion 610, a key (a key integrated into the internal fitting groove is not shown) protruding inward is integrally formed in the fitting groove. do.

6, the external fitting groove 720 is a groove formed at one end of the coupling hole 700, and the cross section of the external fitting groove 720 is a groove formed in the outside of the fixed composite tube 600 ' And when the key seat 620 is formed on the fixed composite tube 600 ', the key 730 protruding outward is integrally formed in the external fitting groove 720.

The composite tubes 600 and 600 'and the connector 700 are prepared. In the assembly section, a binder (adhesive) is applied to the fitting groove of the connector 700, and the composite tube 600 (corresponding to the fitting groove) The composite tube 600 and 600 'coated with a binder are bonded to one end of the composite shaft 800 and the binder 700 is bonded to the ends of the composite shaft 800 and 600' .

The coupling protrusion 610 of the multi-stage composite tube 600 is inserted into the internal fitting groove 710 of the coupling hole 700, so that the coupling protrusion 610 of the multi- In the case of the connector 700 of the external fitting groove 720, the outside of the external fitting groove 720 is fitted into the end of the constant-type composite tube 600 ' When the key seat 620 is formed in the tube 600 ', the connector 700 having the integrated key 730 is used to assemble the key 730 to the key seat 620.

For example, a connecting hole 700 of the internal fitting groove 710 may be formed at both ends of the multi-stage constant pitch composite tube 600, and external fitting grooves 720 Or both ends of one composite tube 600 and 600 'may be configured differently in a multi-stage type or a constant type and may have an internal fitting groove 710 And the outer fitting groove 720 of the connecting hole may be formed to have a polygonal cross section so that the outer shape of the multistage composite tube 600 The coupling tube 700 of the external fitting groove 720 having a polygonal cross section at one end or both ends of the composite tube 600 and 600 ' And can be variously configured according to the structure and key combination.

The composite shaft manufacturing system including the braiding machine 100, the transferring unit, the molding machine 400, the collecting and demounting unit, the gathering unit, and the braiding unit 100 as an assembly unit is configured.

9, the material preparing step S1 is a step of preparing a material for the composite vehicle shaft for a passenger car 800. The composite material shaft for a vehicle 800 The connector 700 is formed of a propeller shaft of an automobile, a constant velocity joint constituting a connection for both ends of a drive shaft, a universal joint (yoke) , Splines, and so on.

6 and 7, the coupling hole 700 is formed in the center of the coupling hole 700. The coupling hole 700 is formed in the center of the coupling hole 700, The inner fitting groove 710 having the fitting groove or the outer fitting groove 720 having the fitting groove formed on the outer periphery of the fitting hole 700. Firstly, (Not shown) is formed in a central portion of the one end of the multi-stage composite tube 600, and the internal fitting groove 710 is configured to fit the coupling projection 610 of the multi-stage composite tube 600, A key (not shown) protruding inward is integrally formed in the interior of the internal fitting groove 710.

The outer fitting groove 720 is formed at one end of the coupling hole 700 and the outer fitting groove 720 is formed at one end of the composite tube 600 or 600 ' And when the key seat 620 is formed in the composite tube 600, the key 730 protruding outward is integrally formed in the external fitting groove 720.

The composite tube 600 is a tube of hollow composite material along the longitudinal direction. The composite tube 600 is divided into a constant-shaped composite tube 600 'and a multi-stage composite tube 600 according to its structure, The constant-type composite tube 600 'is formed to have a circular cross-section along the longitudinal direction. The constant-type composite tube 600' is coupled with a connector 700, which forms the external fitting groove 720. It is preferable that the coupling of the constant-type composite material tube 600 'and the coupling hole 700 is adjusted to have a dimension (sectional size) so as to be assembled by interference fit.

The multi-stage composite tube 600 is composed of a main body and connection protrusions 610 at both ends of the main body. The main body of the multi-stage composite tube 600 is in the shape of a shaft and the connection protrusions 610 are circular, polygonal The connecting protrusions 610 may be formed to have the same size along the longitudinal direction or the connecting protrusions 610 may have a sectional size larger or smaller than that of the main body, 6, the connecting protrusion 610 may be formed to have a cross section that becomes smaller as it goes from the main body to the end, as shown in FIG. 6, and the multi- (700) forming the fitting groove (710).

For reference, the composite tube 600 includes at least one key seat 620 formed at one end or both ends thereof. The multi-end composite tube 600 includes a fixed composite tube 600 'and a coupling protrusion 610 having a circular cross section. The coupling protrusion 610 of the multi-stage composite tube 600 is formed of a polygonal cross section such as a rectangular cross section, a hexagonal cross section, or an octagonal cross section, 610 may also constitute a key seat (not shown).

The method for manufacturing the composite tubes 600 and 600 'will be described. First, the mandrel preparation step G1 is performed by braiding the braid 600 and 600' The mandrel 200 is formed in the shape of a shaft or a rod and the cross section of the mandrel 200 is formed into a composite tube Is formed to be equal to or smaller than the smallest cross section constituting the first and second electrodes 600 and 600 '.

3 and 4, the mandrel 200 can be used as a mold for knitting the braid along the length direction at one end of the mandrel 200 And a plurality of exhaust holes 200c extending from the outside to the air passageway 200a are formed and an air inlet 200b through which air is injected is formed at one end of the mandrel 200 Air (air pressure) exiting from the discharge hole 200c is supplied to the preform 500 through the air inlet 200b of the mandrel 200 by injecting air from the air passage 200a into the discharge hole 200c, So that the blow molding is performed.

For reference, the mandrel 200 is also used for forming, so that if necessary, the release agent is applied before braiding to facilitate demoulding after molding.

In the braiding step G2, the preform 500 is formed by knitting a braid along the surface of the mandrel 200. The braiding machine 100 (braider) is used for knitting the braid, The braiding machine 100 can apply a two-dimensional braiding machine (a bi-excel braiding machine), a three-dimensional braiding machine (a radial braiding machine, an interlocking braiding machine, etc.) according to the required strength of the composite tubes 600 and 600 ' The fibers 121 and 141 to be applied to the braiding may be formed by applying high strength fibers such as carbon fiber, glass fiber and aramid fiber and applying high strength fibers or using a toe prepreg Tow prepreg, tow prepreg) is applied.

The braid knitted to the mandrel 200 is preferably knitted longer than the length of the composite tube 600 or 600 'to be manufactured. Thus, the preform 500 is wound on the mandrel 200 with the braid .

Next, the molding and demolding step G3 forms the composite tube 600 (600 ') by molding the preform 500, and the mandrel 200 including the preform 500 is applied to the molding machine 400 As shown in FIG. 2, the inside of the molding molds 410 and 420, which are separated and combined with the molding machine 400, is formed in an outer shape (appearance) of the composite tubes 600 and 600 ' The knitted mandrel 200 is placed inside the molds 410 and 420.

The product is molded by an RTM (Resin Transfer Molding) molding method in which a thermosetting resin or a thermoplastic resin is injected into the molding dies 410 and 420 by combining the mandrel 200 and the molding dies 410 and 420 The preform 500 to which the toe prepreg is applied is applied with an autoclave molding method for heating and thermoforming the molding molds 410 and 420 including the mold. Air is injected into the mandrel 200 to shape the composite tubes 600 and 600 'so that the preform 500 is closely contacted with the inner surfaces of the molding dies 410 and 420 Blow molding (blow molding) is performed in the form of a composite tube 600 (600 ') structure. The preform 500 is cured by thermoforming to form a composite tube 600 (600'). The composite tubes 600 and 600 'manufactured by the molding molds 410 and 420 are placed in the molding molds 410 and 42 0).

As described above, the composite tubes 600 and 600 'can be formed into two shapes. As shown in FIG. 4, the composite tubes 600 and 600' 410) 420, a constant-shaped composite tube 600 'having a circular cross-section along the longitudinal direction is molded, and as shown in FIG. 5, the inner structure is smaller on both sides in the longitudinal direction A multi-stage composite tube 600 'composed of a main body and connection projections 610 at both ends thereof is molded by applying the molding molds 410 and 420 having a single or a larger cross section.

The composite tubes 600 and 600 'are manufactured in the mandrel preparing step G1 to the molding and demolding step G3. The molded composite tubes 600 and 600' Step G5 is a step of cutting the both ends of the formed composite tube 600 or 600 'to the designed dimensions and arranging the edges or the surface. The length of the composite tube 600 (600 ') in the braiding step (G2) is longer than the length of the composite tube 600 (600') designed in step G2 and the molding and demolding step G3 The composite tube 600 is formed to a length slightly longer than that designed in the molding and demolding step G3 and the composite tube 600 is formed in the grooming step G4, Both ends of the molded composite tube 600 'are cut according to the designed dimensions, and the cut surfaces are arranged. In addition, the table of the molded composite tubes 600 and 600' Or to clean the outer surface.

The next processing step G5 is to form one or more key seats 620 at one or both ends of the composite tube 600 or 600 'or when the key seat 620 is required at the coupling projection 610, The ends of the composite tubes 600 and 600 'or the connection protrusions 610 may be connected to one end or both ends of the composite tubes 600 and 600' according to the structure of both ends of the composite tubes 600 and 600 ' The composite material tubes 600 and 600 'are manufactured in the mandrel preparation step G1 to the molding and the coloring step G4 and the mandrel preparation step G1 ) To the processing step (G5).

The binder applying step S2 for manufacturing the automotive composite shaft is a step of applying a binder to the prepared composite tube 600 or 600 'or the connector 700, The composite tube 600 and 600 'are applied to both ends of the composite tube 600 and 600', respectively. However, depending on the type of the fitting groove of the connector 700, A binder is applied to the outer surface or the inner surface of the composite tube 600 (600 ').

The subsequent assembling step S3 is a step of assembling the connector 700 to the composite tube 600. When the connector 700 and the composite tubes 600 and 600 'are combined, the external fitting groove 720 The coupling hole 700 is engaged with one end or both ends of the constant-type composite tube 600 'by interference fit, and the key 730 and the key seat 620 are assembled together.

The connecting hole 700 having the inner fitting groove 710 is engaged with the coupling protrusion 610 of the multi-stage composite tube 600, and the coupling protrusion 610 of the multi- (Not shown) and the key seat (not shown) are assembled by fitting the key and the key seat.

In the assembling step S3, the connector 700 is assembled to the composite tubes 600 and 600 ', and the connector 700 selected according to the type of the composite tubes 600 and 600' 600 'to integrate them.

For reference, in the structure of one composite tube 600 (600 '), a connecting port 700 of the internal fitting groove 710 is formed at both ends of the multi-stage constant-pitch composite tube 600, The ends of the composite tube 600 'constitute the connector 700 of the external fitting groove 720. Alternatively, the ends of one composite tube 600 and 600' may be formed in a multi- And the connecting hole 700 of the inner type fitting groove 710 and the connecting hole 700 of the outer type fitting groove 720 having different structures at both ends thereof, respectively.

In addition, in the above description, the coupling protrusion 610 of the multi-stage composite tube 600 is assembled with the coupling hole 700 of the internal fitting groove 710, It is possible to assemble the connector 700 of the external fitting groove 720. In other words, if the external fitting groove 720 of the connector has a polygonal cross-section, the polygonal cross- The coupling tube 700 of the external fitting groove 720 can be assembled and coupled and the assembly of the composite tube 600 and 600 'and the coupling tube 700 can be variously configured according to the sectional structure and key combination. It is.

Finally, the curing step S4 is a step of curing the assembled composite tube 600 (600 ') and the binder applied to the connector 700, and the integrated composite tube 600 (600') and the connector 700 , The binder applied to the composite tube 800 is hardened by curing for a predetermined time and then the binder is completely cured as shown in FIG. The manufacturing is completed.

The composite shaft 800 thus manufactured can be applied to a propeller shaft or a drive shaft of an automobile or the like. Since the composite shaft 800 has a lightweight composite material except for the coupling hole 700, the weight of the vehicle body is reduced Since the preforms 500 having uniform strength along the circumferential direction and the longitudinal direction using the preforms 500 knitted by braiding are excellent in strength by the composite material and excellent in twisting and torque, Feature.

In addition, since two conventional propeller shafts are separated from each other, the length of the preforms 500 can be applied as designed according to the conditions of the mandrel 200, so that the propeller shafts, which are conventionally divided into two, There is a characteristic that can be done.

In addition, the composite tubes 600 and 600 'and the connector 700 may be bonded together by the binder, or may be combined by the interference fit and the key engagement (key and key seat connection), or the polygonal connection projection 610, The engagement between the connector 700 and the coupling protrusion 610 is firm and the slip (sliding in the circumferential direction) is prevented even when the composite shaft 800 is rotated at a high speed, And the connecting protrusion 610 of the multistage composite tube 600 is formed into a polygonal cross-sectional structure by molding the preform 500 to be braided so that it can be easily assembled with the connector 700, There is a feature that sliding (slip) is prevented.

100: Braiding machine 110: Carrier 120: Bobbin
121: fiber 130: slider
140 :: Bobbin 141: Fiber
200: mandrel 210: connector 200a:
200b: air inlet port 200c: exhaust port
300: conveying means
400: Molding machine 410, 420: Molding mold
500: Preform 600, 600 ': Composite tube
610: connection protrusion 620: key seat
700: Connector 710: Inner fit-in groove
720: outer type fitting groove 730: key
800: composite shaft

Claims (7)

A braiding machine for knitting a braid by mutual intersection of fibers;
A conveying unit that includes a mandrel and conveying means for moving the mandrel up and down and left and right so that the conveying unit forms the preform while knitting the braid on the mandrel by the baling machine while moving the mandrel;
A molding machine for thermally forming a preform of a braid knitted in a mandrel of a transfer part and making an interior hollow hollow tube along the longitudinal direction, wherein the molding die of the molding machine is configured to be separated and joined to at least two, A molding machine for blow molding so that the main body and the connecting protrusions at both ends of the main body are integrally formed, the connecting protrusions being formed into a polygonal cross section;
A collecting and demolding unit for collecting the composite tube and the mandrel of the molding machine and removing the mandrel from the composite tube;
A trimming part for aligning the length of the demolded composite tube and arranging edges and surfaces;
A manufacturing system for a composite material shaft for an automobile including a coupling portion having a fitting groove corresponding to a coupling projection of the composite tube and an assembly portion for applying a binder to the coupling projection of the composite tube and assembling the coupling portion by fitting the coupling hole,
Wherein a composite material shaft of a structure in which a connector is integrally formed with a composite tube formed with a preform is manufactured.
delete delete delete delete A composite tube in which a preform knitted by braiding is thermoformed while blowing together with a resin and a coupling port of a shaft for a vehicle for use in which a fitting groove is formed at one end is prepared. The composite tube has a body having a circular cross section, The connecting protrusions formed integrally with one another,
A material preparation step (S1) of forming a connecting projection in the form of a polygonal section, the fitting groove of the connecting port corresponding to the cross-section of the connecting projection of the composite tube;
A binder applying step (S2) of applying a binder to one end or both ends of the composite tube and applying a binder to the fitting groove of the connector;
An assembling step (S3) of fitting the connecting protrusion of the composite tube into the fitting groove of the connector;
Wherein the automotive composite shaft is manufactured in such a manner that the connector is integrated with the composite tube in the curing step (S4) for curing the binder.
A composite tube having a structure in which a body of a circular cross section and a connecting projection of a polygonal cross section are integrally formed on both ends of the body of the circular cross section are formed by blowing and preforming the preform knitted by the manufacturing method of claim 6, Wherein a composite fitting shaft having a fitting groove corresponding to a coupling projection of the composite tube is integrally formed by a coupling projection of the composite tube and a coupling groove of the coupling projection. A composite material shaft produced by a method.

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