CN211566991U

CN211566991U - Composite material winding forming die

Info

Publication number: CN211566991U
Application number: CN201921951086.0U
Authority: CN
Inventors: 朱燕伟
Original assignee: Jinggong Shaoxing Composite Technology R & D Co ltd; Jinggong Shaoxing Composite Material Co ltd
Current assignee: Shaoxing Baojing Composite Material Co ltd; Shaoxing Baojing Composite Technology Research And Development Co ltd
Priority date: 2019-11-09
Filing date: 2019-11-09
Publication date: 2020-09-25
Anticipated expiration: 2029-11-09

Abstract

The utility model relates to a composite material winding forming die, which is characterized in that the die comprises a ring frame, a shell plate and a flange; the shell plate of the mould head sealing section is connected between the flange and the ring frames by screws, and the shell plate of the mould straight cylinder section is connected between the two ring frames by screws. The utility model discloses can effectively solve the problem that the mould size that traditional winding forming die reserved the fit-up gap and lead to dwindles, mould rigidity is big, the dead weight is little, and assembly and dismantlement method are simple, and the feasibility of implementation is good.

Description

Composite material winding forming die

Technical Field

The utility model relates to an equip the manufacturing field, specificly relate to a combined material winding forming die.

Background

The composite material is widely applied to the fields of aerospace and the like due to the superior characteristics of light weight and high strength, and structural parts of spacecrafts such as a fairing, a solid rocket engine shell, a fuel storage tank and the like are mainly formed by adopting a winding process. The important ring of winding molding is the design of the mold, and the reusable combined mold has the characteristics of stable winding quality, outstanding economy and the like, and is the winding mold which is adopted most.

Because in the winding forming process, exert certain tension for the fibre, fibre tension causes the mould to bear hoop pressure, therefore often reserves 3 ~ 5 mm's clearance between the hoop part of traditional modular mold and guarantees the detachability of mould, directly not contact between the hoop part, but connect through otic placode and bolt, perhaps connect fixedly through bracing piece and bolt and dabber.

For products with thicker winding layers, the winding layers need to be cured in sections, i.e. pre-cured once every several layers are wound, the pre-curing temperature is often above 100 ℃, and the thermal expansion coefficient of the winding layers is small (3 × 10)^-7K^-1) And the thermal expansion coefficient of the metal mold is large (1.1 × 10)^-5K^-1～2.3×10^-5K^-1) The thermal expansion of the metal is restricted by the winding layer, and the fiber tension of the winding layer makes the metal die in a severe stress state of circumferential extrusion. Under the same use pressure requirement, the larger the diameter, the higher the thickness of the winding layer required by the winding forming product, and the more remarkable the extrusion phenomenon of the winding layer borne by the metal die. Because the mould hoop does not have direct contact between the part, but adopts bolt and other parts to carry out the switching, the hoop extrusion force leads to bolted connection position to produce relative slip to lead to the mould external diameter to reduce, because the mould only has the hoop extrusion condition and does not have the condition that the hoop is drawn, consequently the reduction of mould external diameter is irreversible. The reduction in the outer diameter of the die results in the pre-wound layer not providing sufficient stiffness to maintain its outer diameter dimension for the next winding, resulting in the actual winding diameter for the subsequent winding being below the design value, ultimately resulting in significant variation in the radial dimension of the product. The thicker the product winding layer is, the more the segmented curing times are, the higher the curing temperature is, and the larger the assembly gap of the bolt mounting hole is, the more remarkable the phenomenon that the outer diameter of the die is reduced is. According to engineering experience, large winding molding products with the diameter of more than 4m are adoptedThe radial dimension of the traditional combined die can be reduced by more than 10mm, a series of problems occur during assembly and use of subsequent products, and even the products are scrapped, so that the precision control of the radial dimension of the winding formed products needs to be solved urgently.

In addition, to large-scale winding forming die, its weight is heavier, and the mould span is great, and the connecting bolt between the part need bear very strong load among the traditional mould design scheme, consequently needs to choose major diameter bolt for use, and bolt weight accounts for mould gross weight more than 50% even, brings more adverse effect for the mould design of large-scale winding forming product.

SUMMERY OF THE UTILITY MODEL

For solving the not enough of current large-scale winding forming die existence, the utility model aims at providing a combined material winding forming die, the utility model discloses a realize through following technical scheme:

the composite material winding forming die is characterized by comprising a ring frame, a shell plate and a flange; the shell plate of the mould head sealing section is connected between the flange and the ring frames by screws, and the shell plate of the mould straight cylinder section is connected between the two ring frames by screws.

The ring frames are multiple, each ring frame is composed of at least one section frame I, a plurality of section frames II and connecting sheets, matching surfaces between the section frames are in gapless matching, adjacent section frames are connected into a whole through the connecting sheets, an included angle formed by the matching surfaces of the section frames I and the adjacent section frames II and the radial direction is alpha, the alpha is a friction angle of the matching surfaces, and the calculation formula is that

α＝arctanμ

Wherein mu is the friction coefficient between the matching surfaces of the segmented frames, alpha satisfies the condition that alpha is more than theta/2, and theta is the central angle of the first segmented frame. The actual value of alpha can be 0-5 degrees smaller than arctan mu, but the condition that alpha is more than theta/2 still needs to be met.

The shell plate of the mould head sealing section is connected between the flange and the ring frame 1 by screws, the shell plate 2 of the mould straight cylinder section is connected between the two ring frames by screws, the outer edge of the ring frame is provided with a boss with a trapezoidal section, the end surface of the shell plate 2 is in clearance-free fit with the side surface of the boss of the ring frame, the included angle formed by the matching surface between the shell plate and the boss of the ring frame and the radial plane of the mould is beta, the beta is the friction angle of the matching surface, and the calculation formula is that

β＝arctanν

Wherein ν is the coefficient of friction between the mating surfaces of the shell plates and the ring frame. The actual value of beta can be 0-5 degrees smaller than the value of arctan v.

Use the utility model discloses when creating the winding shaping that is used for the product, the ring frame is in hoop extruded stress state, and the fitting surface between segmentation frame one and the adjacent segmentation frame two is in self-locking state, and the supplementary restraint of connection piece and coverboard in addition, the fitting surface between segmentation frame one and the adjacent segmentation frame two can not produce relative sliding, therefore the screw can not bear great axial force or shearing force, and the mould diameter also can not show to reduce because of the pressure increase on winding layer. Similarly, under the action of axial force, the matching surface of the ring frame and the shell plate is also in a self-locking state, sliding cannot occur, and the axial size of the die cannot be obviously reduced due to the increase of the pressure of the winding layer. And in the mold removing stage, connecting screws between the segmented frames and the connecting sheets and between the segmented frames and the shell plate of each ring frame are removed, the ring frames vibrate by using an ultrasonic motor near the matching surface, the segmented frame I can be removed easily, and then the segmented frame II and the shell plate can be removed smoothly.

The utility model discloses the self-locking effect of each part fitting surface of ingenious utilization mould makes the biography power between the part more direct, has utilized the law that coefficient of friction reduces, the friction angle reduces under the vibration condition again (for example ultrasonic vibration can make coefficient of friction reduce about 10%), makes the form removal process simple swift.

The utility model has the advantages that: the problem of the mould size that traditional winding forming die reserved assembly clearance leads to dwindles is effectively solved, can show the atress that reduces connecting screw, and mould rigidity is big, the dead weight is little, and structural style is simple, and the feasibility of implementation is good.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of a partial structure of the present invention.

Fig. 3 is a schematic view of the ring frame structure of the present invention.

Fig. 4 is a schematic view of the connection structure of the middle shell plate and the ring frame of the present invention.

The labels in the figures are:

1, the ring frame is arranged in a ring shape,

2, a shell plate is arranged on the shell plate,

3, a flange is arranged on the outer side of the flange,

11 the number of the segment frames one is greater than the number of the segment frames one,

12 the number of the second segment is two,

13 connecting pieces.

Detailed Description

The technical solution of the present invention will be further described with reference to fig. 1 to 4 and by means of specific embodiments.

The utility model provides a combined material winding forming die, as shown in fig. 1-4, it includes ring frame 1, coverboard 2, flange 3. The ring frame 1 have a plurality ofly, every ring frame 1 comprises at least one segmentation frame 11, a plurality of segmentation frame two 12 and connecting piece 13, and the fitting surface between the segmentation frame is the zero clearance fit, and adjacent segmentation frame is connected through connecting piece 13 and becomes an organic whole, and the fitting surface of segmentation frame one 11 and two adjacent segmentation frame two 12 forms the angle of friction that the radial direction was the fitting surface. The shell plate 2 of the end sealing section of the die is connected between the flange 3 and the ring frames 1 by screws, the shell plate 2 of the straight cylinder section of the die is connected between the two ring frames 1 by screws, the outer edge of each ring frame 1 is provided with a boss with a trapezoidal section, the end surface of the shell plate 2 is in clearance-free fit with the side surface of the boss of the ring frame, and the included angle formed between the matching surface between the shell plate 2 and the boss of the ring frame and the radial plane of the die is the friction angle of the matching surface.

The preparation and use processes of the die are as follows:

(1) preparing a first composite material sectional frame 11 and a second composite material sectional frame 12 through a vacuum infusion process, and machining to obtain a metal connecting sheet 13;

(2) preparing a composite shell plate 2 by a prepreg mould pressing process;

(3) connecting the first subsection frame 11 and the second subsection frame 12 into a ring frame 1 by using connecting sheets 13 and screws;

(4) mounting a shell plate 2 of a straight cylinder section between two ring frames 1 by using screws;

(5) mounting shell plates 2 at the end sockets at two ends between a ring frame 1 and a flange 3 at the end part by using screws;

(6) the winding forming is carried out;

(7) in the stripping stage, firstly, the connecting sheet 13 of one ring frame 1 is removed, the ring frame 1 is vibrated by an ultrasonic motor near the matching surface, the first sectional frame 11 can be easily removed firstly, and then the second sectional frame 12 can be removed;

(8) other ring frames 1 are removed by the method in the step 0, and the shell plates 2 of the straight cylinder sections can be removed at the same time;

(9) the end shell plate 2 and the end flange 3 are removed.

The technical principle of the present invention is described above with reference to the specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention.

Claims

1. The winding forming die for the composite materials is characterized by comprising a plurality of ring frames, each ring frame is composed of at least one first section frame, a plurality of second section frames and connecting pieces, matching surfaces among the section frames are in gapless fit, and the adjacent section frames are connected into a whole through the connecting pieces.