CN107116811B - Composite material locator mold and manufacturing method of locator - Google Patents

Abstract

The invention relates to the technical field of dies, and provides a carbon fiber positioner die and a using method thereof, wherein the die comprises an upper die and a lower die, and the upper die and the lower die are buckled with each other to form a cavity with the same shape as a main beam of a positioner; the first positioning block and the second positioning block are respectively positioned at two ends of the extending direction of the cavity; and a plurality of connection portions for connection. The special mould is designed according to the shape of the positioner and the carbon fiber composite material forming process, the integral structure is manufactured by the special mould co-curing process, the number of parts and fasteners can be reduced, the weight of the positioner is effectively reduced, the positioner has the advantages of high specific strength, high specific modulus, strong corrosion resistance and the like, and the serviceability of the positioner is improved.

Description

Composite material positioner die and manufacturing method of positioner

Technical Field

The invention relates to the technical field of molds, in particular to a composite material positioner mold and a manufacturing method of a positioner.

Background

The high-speed railway is one of the important directions of railway development and is also an important guarantee for ensuring the economic development of China. The simple maintenance, safety and efficient operation of the high-speed railway have great significance for the development of the whole railway network. By 2015, the railway operation mileage of China breaks through 12 kilometers, and the high-speed railway operation mileage reaches 1.9 kilometers. At present, domestic high-speed railway contact network equipment is developed for many years, and a self-standard system is initially formed through introduction, digestion and absorption, so achievements such as '200-250 km/h temporary technical condition for electrified railway contact network equipment', '300-350 km/h temporary technical condition for electrified railway contact network equipment' and the like are formed.

The current locator is the straight shape locator of aluminum alloy generally, and the general behavior is good in recent years, but also has some inadequacies and space of improvement, mainly has following problem:

(1) in severe corrosion areas such as coastal areas, tunnels and the like, the corrosion resistance of the aluminum alloy positioner is insufficient;

(2) the fatigue resistance of the aluminum alloy positioner is insufficient;

(3) the straight positioner and the dynamic envelope line of the pantograph have poor matching performance, and the pantograph hitting hidden danger exists under the extreme working condition;

(4) excessive abrasion is easy to occur at the connecting part of the locator hook ring;

(5) the number of parts of the positioner is too large, and safety risks exist at the riveting position;

(6) the aluminum alloy positioner is relatively heavy, and the flow quality is influenced.

The strategy of going away is implemented to chinese high-speed railway, current contact net faces the patent and the real scheduling problem of maintaining, by the general bureau of railways project development next generation contact net, hope through adopting the new material, each subassembly of novel contact net is tried to make a trial use of to new structure and new technology, one of them scheme is adopting the compound material scheme of carbon fiber, hope make full use of carbon fiber composite material self lightweight, high strength, corrosion-resistant, integrated into one piece, the advantage that current aluminum alloy or steel material are superior to such as few maintenance volume, improve the reliability of product, reduce a large amount of maintenance work in customer later stage.

A new type of positioner made of carbon fiber composite material was developed, as shown in fig. 1-4. The locator has the advantages of high strength, light weight, corrosion resistance, fatigue resistance, simple installation and adjustment and the like; therefore, in order to realize mass production of the positioner, it is urgently needed to provide a dedicated mold.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, the invention provides a composite material positioner die and a manufacturing method of the positioner.

The technical scheme adopted by the invention for solving the technical problem is as follows: a composite material locator mould, the cross section of the said locator is H-type, the said H-type cross section includes the web, and locate at the assembly of the component that the web both ends use, the said mould means endows the composite material products shape in shaping, including upper die and lower die, said upper die and lower die are used for forming the cavity the same as main girder shape of the said locator to buckle; the upper die and the lower die are used for paving the prepreg and forming a cavity.

The first positioning block and the second positioning block are respectively positioned at two ends of the cavity in the extending direction; the positioning blocks at the two ends are used for positioning and connecting and fixing the upper die and the lower die.

The first upper connecting part is formed at one end of the upper die, the first lower connecting part is formed at one end of the lower die, the first upper connecting part and the first lower connecting part are opposite up and down, and the first positioning block is fixedly connected with the first upper connecting part and the first lower connecting part;

and the second upper connecting part is formed at the other end of the upper die, the second lower connecting part is formed at the other end of the lower die, the second upper connecting part and the second lower connecting part are opposite up and down, and the second positioning block is fixedly connected with the second upper connecting part and the second lower connecting part. And the two ends of the upper die and the lower die are respectively provided with a connecting structure of a positioning block, and the upper die and the lower die are matched with the positioning blocks to realize positioning and complete connection of the upper die and the lower die.

Further, go up the mould inboard and have the last mould profiled surface that is formed by last boss, the lower mould inboard has the lower mould profiled surface that is formed by lower boss, go up the mould profiled surface with lower mould profiled surface make-up forms the die cavity. The shapes of the upper die forming surface and the lower die forming surface are designed according to the shape of the positioner, and the boss is used for forming two opposite grooves of an H-shaped structure of the positioner, so that the setting property is good.

Further, first locating piece includes first locating part and first spacing portion, first locating part and first spacing portion T shape structure as an organic whole connection, first locating part insert establish between first last connecting portion and the first connecting portion down and through the cylinder pin that runs through first last connecting portion, first locating part and first connecting portion down in proper order with first last connecting portion and first connecting portion down fixed connection, first spacing portion hugs closely in the outside of first last connecting portion and first connecting portion tip down, just first spacing portion upper end is through cylinder pin and first last connecting portion fixed connection, first spacing portion lower extreme is through cylinder pin and first connecting portion down fixed connection.

Furthermore, the second positioning block comprises a second positioning part and a baffle, the second positioning part and the baffle are of a split-connection T-shaped structure, the second positioning part is inserted between the second upper connecting part and the second lower connecting part and is fixedly connected with the second upper connecting part and the second lower connecting part through cylindrical pins which sequentially penetrate through the second upper connecting part, the second positioning part and the second lower connecting part, the baffle is tightly attached to the outer sides of the end parts of the second upper connecting part and the second lower connecting part, the upper end of the baffle is fixedly connected with the second upper connecting part through the cylindrical pins, and the lower end of the baffle is fixedly connected with the second lower connecting part through the cylindrical pins.

The second positioning part and the baffle are separated to facilitate die assembly; the first locating block at the other end is integrated, so that pressure is applied to the direction of the locating pin. The first positioning block is designed to move a certain distance from front to back, and the left and right positions are limited, so that the positioning pin is positioned on one hand, and the vacuum bag can be fully pressed by the first positioning block on the other hand.

And further, the device also comprises a silicon rubber strip which is sealed at two sides of the cavity. The positioning and forming device is used for positioning and forming two side edges of the H-shaped positioner. The silicone rubber strip transmits pressure on one hand and ensures that the surface is smooth and clean on the other hand.

Further, the mould also comprises a vacuum bag, and the mould is integrally positioned in the vacuum bag.

The mould meets the shaping requirements of the product, namely the carbon fiber composite material positioner, such as structure, shape, size and the like, and meets the requirements of pressure transmission and heat transmission.

A manufacturing method of a composite material locator adopts the composite material locator mold for hot press molding, and comprises the following steps:

1) mold preparation

When the mold is used for the first time, firstly, cleaning up sundries such as oil stain, dust and the like on the surface of the mold by using a clean white cloth, wiping the surface of the mold by using acetone, then, standing for about 10min, and coating a release agent; preferably, the release agent is applied 3 times in total, each time with a time interval of 15 min. And the demolding effect is ensured by coating the demolding agent for multiple times.

2) Prepreg cutting

Designing a blanking drawing according to the structural requirement; loading the blanking drawing into a cutting machine; cutting the prepreg with the corresponding shape according to the requirements of a drawing; after cutting, sealing and storing the prepreg, and waiting for laying; when the prepreg is cut, any splicing and lapping are not allowed, and the defective part of the prepreg is discarded; the prepreg is an intermediate material for preparing a composite material, wherein the prepreg is formed by impregnating continuous fibers or fabrics with a resin system to form a composite of the resin system and a reinforcement. The prepreg types include unidirectional prepreg, unidirectional fabric prepreg (weft yarn < 10%), fabric prepreg, narrow-band prepreg (mm-order), prepreg yarn, and wrinkle-free fabric prepreg (combined sewing technology).

3) Spreading plaster

Firstly, respectively paving and pasting prepreg on an upper die and a lower die, trimming the part of the prepreg beyond the size by using scissors and the like, and controlling the angular deviation of the prepreg within a certain range; when the first layer of prepreg is laid and pasted, partial turned edges are left at the citron strip parts; when the rectangular bar parts are paved to the penultimate prepreg layer, turning up the turned edge remained in the first layer of prepreg layer, and paving the last layer of prepreg layer in the rectangular bar parts; this increases the aesthetic appearance of the edges of the rafters of the finished product on the one hand and improves the structural properties to a certain extent on the other hand.

4) Die assembly

After the upper die and the lower die are paved and adhered, positioning pins and sleeves are placed, the upper die and the lower die are buckled oppositely, then the first positioning block is fastened to the upper die and the lower die through the cylindrical pins and the bolts, the other end of the first positioning block is clamped through the C-shaped clamp to avoid tilting, so that the upper die and the lower die are tightly adhered, then the silicon rubber strip part is paved, and finally the first positioning block and the second positioning block are fastened to the upper die and the lower die through the pins and the bolts; the metal sleeve part applies pressure through silicon rubber thermal expansion, so that the design of a metal die is simplified on one hand, and the attractive appearance of the molded surface is ensured on the other hand.

Due to the characteristics of the strength and rigidity of the composite material, low strength between layers of the composite material, small ductility and the like, the metal part positioning pin and the sleeve are used as connecting members of the positioner and other parts, and in order to ensure the installation and use performance requirements of the carbon fiber composite material structural member and avoid machining the carbon fiber composite material substrate, a process measure of placing a metal member on the carbon fiber composite material substrate in advance is adopted to ensure that the metal member is an embedded part in the forming process of the carbon fiber composite material structural member. The linear expansion coefficient of the carbon fiber composite material is more than one order of magnitude smaller than that of aluminum alloy and titanium alloy, but is close to that of stainless steel, and the carbon fiber positioner has higher requirements on structural performance and thermal stability and is not suitable for selecting aluminum alloy materials as embedded parts; stainless steel materials are adopted as embedded parts. In order to prevent the embedded part from loosening, measures such as a square head flange, external diameter knurling, positioning pins and the like can be selected and embedded in the carbon fiber composite material matrix.

5) Curing

Laying a vacuum auxiliary material on the product laid and pasted according to the process requirements, after the laying of the vacuum auxiliary material is finished, carrying out vacuum sealing on the product, and carrying out vacuum degree detection on the autoclave; then, curing the product, wherein in the process of curing the product, a curing record is made, and the curing system is set to be 120 ℃/2 h; the vacuum auxiliary material mainly refers to a ventilated felt and a vacuum bag, wherein the whole mould is wrapped by the ventilated felt and then placed in the vacuum bag for vacuum sealing;

6) demoulding

And (4) demolding and deburring the cured and molded product.

After curing is finished, taking the die out of the autoclave, and removing the vacuum bag and the ventilated felt coated outside; screwing all bolts by using an inner hexagonal wrench; screwing the bolt into the demoulding screw holes corresponding to the first positioning block and the second positioning block again; when the bolt is screwed to a certain degree, the die and the workpiece are initially separated, and then a nylon demoulding wedge is inserted into the separation gap to slowly move for demoulding;

care should be taken not to damage the mold and the article, and visual inspection should be carried out without defects on the surface of the article and without significant distortion of the appearance.

Further, the step 2) further comprises the steps of: and marking, after the prepreg is cut, marking the front surface of each prepreg, wherein the marking content comprises the fiber angle direction and the prepreg serial number. And correspondingly marking the cut materials to ensure correct layering, so that the layering sequence and angle can be conveniently confirmed.

Further, the prepreg comprises a unidirectional prepreg and a fabric prepreg, and the angular deviation of the unidirectional prepreg in the step 3) is required to be controlled within +/-5 degrees, and the angular deviation of the fabric prepreg is required to be controlled within +/-6 degrees. The control angle deviation can meet the design requirement and ensure the structural strength.

Further, when the prepreg paving layers in the step 3) need to be lapped, the lapping range is controlled to be 10-15 mm, and all the lapping seams need to be staggered. Stress concentration can be avoided, and the structural strength is reduced.

Further, the step 5) of laying the vacuum auxiliary material specifically comprises the step of laying demolding cloth, a non-porous isolating membrane, silicon rubber, an air-permeable felt and a vacuum bag in sequence, wherein enough allowance is reserved for the vacuum auxiliary material, the demolding cloth and the isolating membrane are completely attached to the surface of the product, and the silicon rubber is completely attached to the product after being fixed by the pressure-sensitive adhesive tape.

Specifically, in the step 5), the vacuum degree detection requires that the vacuum degree is more than 850mbar, the vacuum degree is maintained for 3min, the vacuum degree is reduced by no more than 150mbar, and meanwhile, the vacuum degree of the product in the whole curing process is not less than 800 mbar.

Further, the method also comprises the step 7) of secondary curing, after the product is demoulded and deburred, polishing the surface of a corner reinforcing area roughly by using 200-mesh abrasive paper, filling foam in a groove, polishing and flattening, and finally winding 2 layers of unidirectional prepreg in the circumferential direction; after paving, sequentially paving demoulding cloth, a non-porous isolating membrane, silicon rubber, an air-permeable felt and a vacuum bag at the cavity position of the citron strip, and carrying out secondary curing, wherein the curing system is set to be 120 ℃/2 h.

The curing may be a one-step co-cure or a two-step co-cure.

The composite material of the invention specifically refers to a carbon fiber composite material.

The invention has the beneficial effects that: according to the composite material positioner die and the manufacturing method of the positioner, the special die is designed according to the shape of the positioner and the carbon fiber composite material forming process, the carbon fiber composite material forming process is good, a member with any profile can be easily formed, and an integral structure is manufactured by the special die through a co-curing process, so that the number of parts and fasteners can be reduced, the weight of the positioner is effectively reduced, the composite material positioner die has the advantages of high specific strength, high specific modulus, strong corrosion resistance and the like, and the serviceability of the positioner is improved. The innovation and the advancement are mainly represented as follows:

(1) the field of railway electrification adopts high-performance carbon fiber parts for the first time;

(2) an advanced autoclave integral molding process is adopted;

(3) the positioner body adopts an H-shaped section with reasonable stress;

(4) the corrosion resistance, the fatigue resistance and the wear resistance of the positioner are improved;

(5) the matching of the positioner and the pantograph is improved;

(6) the number of parts of the positioner is reduced, and the integrity is enhanced;

(7) compared with a straight aluminum alloy positioner, the weight is reduced by 25%, and the current collection performance of the bow net is improved.

Drawings

The invention is further illustrated by the following examples in conjunction with the drawings.

FIG. 1 is a schematic view of a positioner;

FIG. 2 is a schematic view of the structure of the dowel end of the locator;

FIG. 3 is a schematic view of the sleeve end of the retainer;

FIG. 4 is a cross-sectional view of the positioner;

FIG. 5 is a schematic structural diagram of a preferred embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of the mold in use;

FIG. 7 is an assembly view of the mold;

FIG. 8 is a schematic perspective view of the lower mold;

FIG. 9 is a bottom view of the lower die;

FIG. 10 is a front view of the lower die;

FIG. 11 is a top view of the lower die;

FIG. 12 is a schematic cross-sectional view A-A of FIG. 11;

FIG. 13 is a schematic perspective view of the upper mold;

FIG. 14 is a bottom view of the upper die;

FIG. 15 is a front view of the upper die;

FIG. 16 is a top view of the upper die;

FIG. 17 is a schematic cross-sectional view B-B of FIG. 14;

FIG. 18 is a schematic perspective view of a first positioning block;

FIG. 19 is a side view of a first positioning block;

FIG. 20 is a top view of the first positioning block;

FIG. 21 is a schematic cross-sectional view of C-C of FIG. 20;

fig. 22 is a schematic structural view of the second positioning portion;

FIG. 23 is a schematic view of the construction of the baffle;

fig. 24 is a schematic flow chart of the laying of the cuff.

In the figure: 100. a positioner 101, a girder 102, a positioning pin 103, a sleeve 104, a web 105, citron strips 1, a lower die 1-1, a first lower connecting part 1-2, a second lower connecting part 1-3, a lower die forming surface 2, a first positioning block 2-1, a first positioning part 2-2, a first limiting part 3, a cylindrical pin 4, an upper die 4-1, a first upper connecting part 4-2, 4-3 parts of a second upper connecting part, 5 parts of an upper die forming surface, 5 parts of a second positioning block, 5-1 parts of a second positioning part, 5-2 parts of a baffle, 6 parts of a positioning pin, 7 parts of a bolt, 8 parts of a pin side forming groove, 9 parts of a sleeve side forming groove, 10 parts of a through hole, 11 parts of a threaded hole, 12 parts of a vacuum bag, 13 parts of a flanging, 14 parts of a silicon rubber strip, 15 parts of a lettering part, 16 parts of a prepreg.

Detailed Description

The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, and merely illustrates the basic structure of the present invention in a schematic manner, and therefore it shows only the constitution related to the present invention.

As shown in fig. 1 to 4, the composite locator 100 according to the present invention includes a main beam 101, a locating pin 102, and a sleeve 103, wherein the main beam 101 includes a main body and a connection joint, the connection joint is disposed at one end of the main body, the sleeve 103 is embedded at the other end of the main body, and the locating pin 102 is embedded in the connection joint. The main body is integrally arc-shaped, the section of the main body is H-shaped, the section of the connecting joint is H-shaped, the middle of the H-shaped is called a web plate 104, and the parts parallel to the two sides are called rafters 105. The connecting joint and the main body form a certain included angle to form a bending mode, so that the original extending direction of the main body is changed, and the connecting joint is bent towards the inner side of the arc-shaped main body.

As shown in fig. 5-7, a composite material positioner 100 mold comprises an upper mold 4 and a lower mold 1, wherein the upper mold 4 and the lower mold 1 are buckled with each other to form a cavity with the same shape as a main beam 101 of the positioner 100;

the first positioning block 2 and the second positioning block 5 are respectively positioned at two ends of the cavity in the extending direction;

the positioning device comprises a first upper connecting part 4-1 formed at one end of the upper die 4 and a first lower connecting part 1-1 formed at one end of the lower die 1, wherein the first upper connecting part 4-1 and the first lower connecting part 1-1 are opposite to each other in the vertical direction, and the first positioning block 2 is fixedly connected with the first upper connecting part 4-1 and the first lower connecting part 1-1;

and a second upper connecting part 4-2 formed at the other end of the upper die 4 and a second lower connecting part 1-2 formed at the other end of the lower die 1, wherein the second upper connecting part 4-2 and the second lower connecting part 1-2 are opposite up and down, and the second positioning block 5 is fixedly connected with the second upper connecting part 4-2 and the second lower connecting part 1-2.

As shown in fig. 8-12, two ends of the lower mold 1 are respectively a first lower connecting portion 1-1 and a second lower connecting portion 1-2, an end surface of the first lower connecting portion 1-1 is provided with three through holes 10 along an axis for inserting cylindrical pins 3 to realize the connecting and positioning of the upper mold 4, the lower mold 1 and the first positioning portion 2-1, the first positioning portion 2-1 is located between the first upper connecting portion 4-1 and the first lower connecting portion 1-1 and is fixed by the cylindrical pins 3 in a penetrating manner, and a side surface of an end portion of the first lower connecting portion 1-1 is further provided with a threaded hole 11 for connecting with the first limiting portion 2-2; the second lower connecting part 1-2 is of a rectangular structure, two through holes 10 which are used as positioning pin holes and used for positioning the positioning pin 6 are respectively arranged on two sides parallel to the axis of the lower die 1, a threaded hole 11 used for fixing is also arranged between every two adjacent positioning pin holes, and two threaded holes 11 are transversely arranged on the side surface of the end part of the second lower connecting part 1-2 and matched with the through holes 10 on the baffle 5-2 in position; the inner side of the lower die 1 is provided with a lower die forming surface 1-3 formed by a lower boss, and the lower surface of the lower die 1 is distributed with a plurality of threaded holes 11 along the axis.

As shown in fig. 13-17, two ends of the upper die 4 are respectively a first upper connecting portion 4-1 and a second upper connecting portion 4-2, an upper end surface of the first upper connecting portion 4-1 is provided with three through holes 10 along an axis, the three through holes are matched with the through holes 10 on the first lower connecting portion 1-1, and a side surface of an end portion of the first upper connecting portion 4-1 is further provided with a threaded hole 11 for connecting with the first limiting portion 2-2; the second upper connecting part 4-2 is of a rectangular structure, two through holes 10 which are used as positioning pin holes and used for positioning the positioning pin 6 are respectively arranged on two sides parallel to the axis of the lower die 1, a threaded hole 11 used for fixing is also arranged between every two adjacent positioning pin holes, two threaded holes 11 are transversely arranged on the side surface of the end part of the second upper connecting part 4-2, are matched with the through holes 10 on the baffle plate 5-2 in position and are used for threaded connection of a bolt 7 or a screw, and the baffle plate 5-2 is fixed on the side surface of the end part of the die; the inner side of the upper die 4 is provided with an upper die forming surface 4-3 formed by an upper boss, the upper die forming surface 4-3 is buckled with the lower die forming surface 1-3 to form the die cavity, the boss is also provided with a lettering part 15 for forming marks on the surface of the positioner 100, and the upper surface of the upper die 4 is distributed with a plurality of threaded holes 11 along the axis.

As shown in fig. 18-21, the first positioning block 2 includes a first positioning portion 2-1 and a first limiting portion 2-2, the first positioning portion 2-1 and the first limiting portion 2-2 are of an integrally connected T-shaped structure, the first positioning portion 2-1 is provided with a waist-shaped through hole 10 at the upper and lower sides, on the side away from the first limiting portion 2-2, of the waist-shaped through hole 10, the upper and lower sides of the waist-shaped through hole 10 are respectively provided with a threaded hole 11, the first positioning portion 2-1 is inserted between the first upper connecting portion 4-1 and the first lower connecting portion 1-1 and fixedly connected with the first upper connecting portion 4-1 and the first lower connecting portion 1-1 through a cylindrical pin 3 sequentially penetrating through the first upper connecting portion 4-1, the first positioning portion 2-1 and the first lower connecting portion 1-1, and a pin-side forming groove 8 for forming a positioning pin 102 is provided on the side of the end of the first limiting portion 2-2; the first limiting part 2-2 is tightly attached to the outer sides of the end parts of the first upper connecting part 4-1 and the first lower connecting part 1-1, two oval through holes 10 perpendicular to the first limiting part 2-2 are arranged on the upper portion and the lower portion of the first limiting part 2-2, the upper end of the first limiting part 2-2 is fixedly connected with the first upper connecting part 4-1 through cylindrical pins 3 penetrating through the oval through holes 10 on the upper portion, and the lower end of the first limiting part 2-2 is fixedly connected with the first lower connecting part 1-1 through the oval through holes 10 on the lower portion through the cylindrical pins 3.

As shown in fig. 22-23, the second positioning block 5 includes a second positioning portion 5-1 and a baffle 5-2, the second positioning portion 5-1 and the baffle 5-2 are in a split-connected T-shaped structure, two sides of the second positioning portion 5-1 are respectively provided with two through holes 10 as positioning pin holes, a threaded hole 11 is provided between two adjacent through holes 10, one side of the second positioning portion 5-1 facing the cavity is provided with a circular-arc-shaped sleeve-side forming groove 9 for forming the sleeve 103-side positioner 100, the second positioning portion 5-1 is inserted between the second upper connecting portion 4-2 and the second lower connecting portion 1-2 and is fixedly connected with the second upper connecting portion 4-2 and the second lower connecting portion 1-2 through a cylindrical pin 3 sequentially penetrating through the second upper connecting portion 4-2, the second positioning portion 5-1 and the second lower connecting portion 1-2, the baffle 5-2 is tightly attached to the outer sides of the end portions of the second upper connecting portion 4-2 and the second lower connecting portion 1-2, two rows of upper and lower waist-shaped through holes 10 are formed in the baffle 5-2, two rows of the waist-shaped through holes are formed in each row and are respectively matched with threaded holes 11 in the side faces of the end portions of the second upper connecting portion 4-2 and the second lower connecting portion 1-2, the upper end of the baffle 5-2 is fixedly connected with the second upper connecting portion 4-2 through a cylindrical pin 3, and the lower end of the baffle 5-2 is fixedly connected with the second lower connecting portion 1-2 through the cylindrical pin 3.

Further, the die comprises a silicon rubber strip 14, wherein the silicon rubber strip 14 is sealed at two sides of the die cavity.

Further, a vacuum bag 12 is included, the mold being entirely located within the vacuum bag 12.

The mold meets the shaping requirements of the product, namely the carbon fiber composite material positioner 100, such as structure, shape, size and the like, and meets the requirements of pressure transmission and heat transmission.

As shown in fig. 6, a method for manufacturing a composite material locator 100, which adopts the composite material locator 100 to perform hot press molding, includes the following steps:

1) mold preparation

When the die is used for the first time, firstly, cleaning up sundries such as oil stain dust and the like on the surface of the die by using white cleaning cloth, wiping the surface of the die by using acetone, then, standing for about 10min, and coating a release agent; preferably, the release agent is applied 3 times in total, each time with a time interval of 15 min.

2) Prepreg 16 cut

Designing a blanking drawing according to the structural requirement; loading a blanking drawing into a cutting machine; cutting the prepreg 16 with the corresponding shape according to the requirements of a drawing; after cutting, sealing and storing the prepreg 16, and waiting for laying; the prepreg 16 is not allowed to be spliced and lapped when being cut, and the defective part of the prepreg 16 is discarded; the prepreg 16 is an intermediate material for preparing a composite material, in which a resin system impregnates continuous fibers or fabrics to form a composite of the resin system and reinforcements. Types of prepreg 16 are unidirectional prepreg 16, unidirectional fabric prepreg 16 (weft < 10%), fabric prepreg 16, tape prepreg 16(mm scale), prepreg roving, wrinkle-free fabric prepreg 16 (combined stitching technique).

3) Spreading plaster

Firstly, paving and pasting the prepreg 16 on the upper die 4 and the lower die 1 respectively, trimming the prepreg 16 at the part beyond the size by using scissors and the like, and controlling the angle deviation of the prepreg 16 within a certain range; as shown in fig. 24, when the first layer of prepreg 16 is laid, a part of the turned-up edge 13 is left at the position of the rafter 105; when the citron strips 105 are partially paved to the penultimate prepreg 16, turning up the turned edge 13 left by the first prepreg 16, and paving the last prepreg 16 of the citron strips 105; this increases the aesthetic appearance of the edges of the rafters 105 of the piece on the one hand and improves the structural performance to a certain extent on the other hand, where the actual laying at a is void-free, here the effect diagram, for the sake of clarity of the structure and position of the turned-up edge 13.

4) Die assembly

After the upper die 4 and the lower die 1 are paved and attached, a positioning pin 102 and a sleeve 103 are placed, the upper die 4 and the lower die 1 are buckled, then the first positioning block 2 is fastened on the upper die 4 and the lower die 1 through a cylindrical pin 3 and a bolt 7, a C-shaped clamp is used at the other end of the first positioning block 2 to prevent the first positioning block 2 from tilting, so that the upper die 4 and the lower die 1 are tightly attached, then a silicon rubber strip 14 part is paved, and finally the first positioning block 2 and the second positioning block 5 are fastened on the upper die 4 and the lower die 1 through the cylindrical pin 3 and the bolt 7;

due to the characteristics of the strength and rigidity of the composite material, low strength between layers of the composite material, small ductility and the like, the metal piece positioning pin 102 and the sleeve 103 are used as connecting members of the positioner 100 and other parts, and in order to ensure the installation and use performance requirements of the carbon fiber composite material structural member and avoid machining the carbon fiber composite material substrate, a process measure of placing a metal member on the carbon fiber composite material substrate in advance is adopted to ensure that the metal member is an embedded part in the forming process of the carbon fiber composite material structural member. The linear expansion coefficient of the carbon fiber composite material is more than one order of magnitude smaller than that of aluminum alloy and titanium alloy, and is close to that of stainless steel, and the carbon fiber positioner 100 has higher requirements on structural performance and thermal stability and is not suitable for selecting aluminum alloy materials as embedded parts; stainless steel materials are adopted as embedded parts. In order to prevent the embedded part from loosening, measures such as a square head flange, an outer diameter knurling and a positioning pin 6 can be selected and embedded in the carbon fiber composite material matrix.

5) Curing

Laying a vacuum auxiliary material on the product which is laid according to the process requirement, after the laying of the vacuum auxiliary material is finished, carrying out vacuum sealing on the product, and carrying out vacuum degree detection on the autoclave; then, curing the product, wherein in the process of curing the product, a curing record is made, and the curing system is set to be 120 ℃/2 h; the vacuum auxiliary material mainly refers to the air-permeable felt and the vacuum bag 12, wherein the whole mould is wrapped by the air-permeable felt and then is placed in the vacuum bag 12 for vacuum sealing;

6) demoulding

And (4) demolding and deburring the cured and molded product. After the curing is completed, taking the mold out of the autoclave, and removing the externally-wrapped vacuum bag 12 and the air-permeable felt; all the bolts 7 are screwed off by using an inner hexagonal wrench; the bolt 7 is screwed into the corresponding demoulding screw holes of the first positioning block 2 and the second positioning block 5; when the bolt 7 is screwed to a certain degree, the die and the workpiece are initially separated, and then a nylon demoulding wedge is inserted into the separation gap to slowly move for demoulding;

paying attention to not damage the die and the product, visually checking that the surface of the product has no defect and the appearance has no serious deformation; the technological process is analyzed, the identified key processes are cutting and paving, the special process is curing, and a key process control card and a special process confirmation table are compiled according to the requirements of the key process and the special process.

Further, the step 2) further comprises the steps of: and marking, after the prepreg 16 is cut, marking the front surface of each prepreg 16, wherein the marking content comprises the fiber angle direction and the prepreg 16 number.

Further, the prepregs 16 comprise unidirectional prepregs 16 and fabric prepregs 16, and the angular deviation of the unidirectional prepregs 16 is required to be controlled to be +/-5 degrees in the step 3), and the angular deviation of the fabric prepregs 16 is required to be controlled to be +/-6 degrees.

Further, when the ply of the prepreg 16 in the step 3) needs to be lapped, the lapping range is controlled to be 10-15 mm, and all the lapping seams need to be staggered.

Further, the step 5) of laying the vacuum auxiliary material specifically comprises the step of laying demolding cloth, a non-porous isolating membrane, silicon rubber, an air-permeable felt and a vacuum bag 12 in sequence, wherein enough allowance is reserved for the vacuum auxiliary material, the demolding cloth and the isolating membrane are completely attached to the surface of the product, and the silicon rubber is completely attached to the product after being fixed by the pressure-sensitive adhesive tape.

Specifically, in the step 5), the vacuum degree detection requires that the vacuum degree is more than 850mbar, the vacuum degree is maintained for 3min, the vacuum degree is reduced by no more than 150mbar, and meanwhile, the vacuum degree of the product in the whole curing process is not less than 800 mbar.

Further, the method also comprises the step 7) of secondary curing, after the product is demoulded and deburred, polishing the surface of a corner reinforced area roughly by using 200-mesh abrasive paper, filling foam in a groove, polishing and flattening, and finally winding 2 layers of unidirectional prepreg 16 in the circumferential direction; after the paving is finished, the demolding cloth, the non-porous isolating membrane, the silicon rubber, the air-permeable felt and the vacuum bag 12 are sequentially paved at the cavity position of the rafter 105, and secondary curing is carried out, wherein the curing system is set to be 120 ℃/2 h.

In light of the foregoing description of preferred embodiments in accordance with the invention, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (14)

1. A composite locator (100) mould, the locator (100) being H-shaped in cross-section, the H-shaped cross-section comprising a web (104) and two rafters (105) located at either end of the web (104), characterized in that: the device comprises an upper die (4) and a lower die (1), wherein the upper die (4) and the lower die (1) are buckled with each other to form a cavity with the same shape as a main beam (101) of the positioner (100);

the positioning device comprises a first positioning block (2) and a second positioning block (5), wherein the first positioning block (2) and the second positioning block (5) are respectively positioned at two ends of the cavity in the extending direction;

the die comprises a first upper connecting part (4-1) formed at one end of the upper die (4) and a first lower connecting part (1-1) formed at one end of the lower die (1), wherein the first upper connecting part (4-1) and the first lower connecting part (1-1) are opposite to each other in the vertical direction, and the first positioning block (2) is fixedly connected with the first upper connecting part (4-1) and the first lower connecting part (1-1);

and a second upper connecting part (4-2) formed at the other end of the upper die (4) and a second lower connecting part (1-2) formed at the other end of the lower die (1), wherein the second upper connecting part (4-2) and the second lower connecting part (1-2) are opposite up and down, and the second positioning block (5) is fixedly connected with the second upper connecting part (4-2) and the second lower connecting part (1-2).

2. The composite locator (100) mold as set forth in claim 1, wherein: the inner side of the upper die (4) is provided with an upper die forming surface (4-3) formed by an upper boss, the inner side of the lower die (1) is provided with a lower die forming surface (1-3) formed by a lower boss, and the upper die forming surface (4-3) and the lower die forming surface (1-3) are buckled to form the die cavity.

3. The composite locator (100) mold as set forth in claim 1, wherein: the first positioning block (2) comprises a first positioning part (2-1) and a first limiting part (2-2), the first positioning part (2-1) and the first limiting part (2-2) are of an integrally connected T-shaped structure, the first positioning part (2-1) is inserted between the first upper connecting part (4-1) and the first lower connecting part (1-1) and is fixedly connected with the first upper connecting part (4-1) and the first lower connecting part (1-1), the first limiting part (2-2) is tightly attached to the outer sides of the end parts of the first upper connecting part (4-1) and the first lower connecting part (1-1), the upper end of the first limiting part (2-2) is fixedly connected with the first upper connecting part (4-1), the lower end of the first limiting part (2-2) is fixedly connected with the first lower connecting part (1-1).

4. The composite locator (100) mold as set forth in claim 1, wherein: the second positioning block (5) comprises a second positioning part (5-1) and a baffle plate (5-2), the second positioning part (5-1) and the baffle (5-2) are in a split-connected T-shaped structure, the second positioning part (5-1) is inserted between the second upper connecting part (4-2) and the second lower connecting part (1-2) and is fixedly connected with the second upper connecting part (4-2) and the second lower connecting part (1-2), the baffle (5-2) is tightly attached to the outer sides of the ends of the second upper connecting part (4-2) and the second lower connecting part (1-2), the upper end of the baffle (5-2) is fixedly connected with the second upper connecting part (4-2), the lower end of the baffle (5-2) is fixedly connected with the second lower connecting part (1-2).

5. The composite locator (100) mold as defined in any of claims 1-4, wherein: the mould also comprises a silicon rubber strip (14), wherein the silicon rubber strip (14) is sealed at two sides of the cavity.

6. The composite locator (100) mold as set forth in claim 5, wherein: also included is a vacuum bag (12), the mold being entirely located within the vacuum bag (12).

7. A method of making a composite locator (100), characterized by: a composite locator (100) mold comprising the composite locator mold (100) of any of claims 1-6, further comprising the steps of:

1) mold preparation

When the die is used for the first time, firstly, cleaning up sundries on the surface of the die, wiping the surface of the die by acetone, then, standing for about 10min, and coating a release agent;

2) cutting of prepregs (16)

Designing a blanking drawing according to the structural requirement; loading a blanking drawing into a cutting machine; cutting the prepreg (16) with the corresponding shape according to the drawing requirements; after cutting, sealing and storing the prepreg (16) and waiting for laying; the prepreg (16) is cut without any splicing and lapping, and the defective part of the prepreg (16) is discarded;

3) spreading plaster

Firstly, respectively paving and pasting the prepreg (16) on the upper die (4) and the lower die (1), trimming the prepreg (16) at the part beyond the size by using scissors and the like, and controlling the angle deviation of the prepreg (16) within a certain range; when the first layer of prepreg (16) is paved, partial flanging (13) is left at the position of the citron strips (105); when the parts of the rafters (105) are paved to the penultimate prepreg (16), the turned-over edge (13) left by the first layer of prepreg (16) is turned up, and then the last layer of prepreg (16) of the rafter (105) parts is paved;

4) die assembly

After the upper die (4) and the lower die (1) are paved, a positioning pin (102) and a sleeve (103) are placed, the upper die (4) and the lower die (1) are buckled, then a cylindrical pin (3) and a bolt (7) are adopted to fasten a first positioning block (2) on the upper die (4) and the lower die (1), a C-shaped clamp is used at the other end to clamp the other end to avoid tilting, so that the upper die (4) and the lower die (1) are tightly attached, then a silicon rubber strip (14) part is paved, and finally the upper die (4) and the lower die (1) are fastened through the first positioning block (2) and a second positioning block (5);

5) curing of

Laying a vacuum auxiliary material on the product laid and pasted according to the process requirements, after the laying of the vacuum auxiliary material is finished, carrying out vacuum sealing on the product, and carrying out vacuum degree detection on the autoclave; then, curing the product, wherein in the process of curing the product, a curing record is made, and the curing system is set to be 120 ℃/2 h;

6) demoulding

Demoulding and deburring the cured and formed product, taking the mould out of the autoclave after curing is finished, and removing the outer vacuum bag (12) and the ventilated felt; screwing all the bolts (7) by using an inner hexagonal wrench; the bolt (7) is screwed into the demoulding screw hole corresponding to the first positioning block (2) and the second positioning block (5); when the bolt (7) is screwed to a certain degree, the die is initially separated from the workpiece, and then a nylon demolding wedge is inserted into the separation gap to perform slow moving demolding.

8. The method of making a composite locator (100) of claim 7, wherein: the release agent in the step 1) is coated for 3 times, and the time interval of each time is 15 min.

9. The method of making a composite locator (100) of claim 7, wherein: the step 2) further comprises the following steps: and marking the front surface of each prepreg (16) after the prepreg (16) is cut, wherein the marking content comprises the fiber angle direction and the serial number of the prepreg (16).

10. The method of making a composite locator (100) of claim 7, wherein: the prepreg (16) comprises a unidirectional prepreg (16) and a fabric prepreg (16), and the angular deviation of the unidirectional prepreg (16) is required to be controlled within +/-5 degrees in the step 3), and the angular deviation of the fabric prepreg (16) is required to be controlled within +/-6 degrees.

11. The method of making a composite locator (100) of claim 7, wherein: when the layers of the prepreg (16) in the step 3) need to be lapped, the lapping range is controlled to be 10-15 mm, and all the lapping seams need to be staggered.

12. The method of making a composite locator (100) of claim 7, wherein: laying the vacuum auxiliary material in the step 5) specifically comprises laying demolding cloth, a non-porous isolating membrane, silicon rubber, an air-permeable felt and a vacuum bag (12) in sequence, wherein enough allowance is reserved for the vacuum auxiliary material, the demolding cloth and the isolating membrane are completely attached to the surface of the product, and the silicon rubber is completely attached to the product after being fixed by a pressure-sensitive adhesive tape.

13. The method of making a composite locator (100) of claim 7, wherein: and 5) detecting the vacuum degree in the step 5), wherein the vacuum degree is required to be more than 850mbar, the vacuum degree is maintained for 3min, the vacuum degree is reduced by no more than 150mbar, and meanwhile, the whole vacuum degree of the product in the curing process is not less than 800 mbar.

14. The method of making a composite locator (100) of claim 7, wherein: the method also comprises the step 7) of secondary curing, wherein after the product is demoulded and deburred, the surface of the corner reinforcing area is roughly polished by using 200-mesh abrasive paper, the groove is filled with foam and is polished to be flat, and finally 2 layers of unidirectional prepreg (16) are wound in a circular direction; after the paving and pasting are finished, the demolding cloth, the non-porous isolating membrane, the silicon rubber, the ventilated felt and the vacuum bag (12) are sequentially paved, and secondary curing is carried out, wherein the curing system is set to be 120 ℃/2 h.

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