CN216300150U

CN216300150U - Forming tool

Info

Publication number: CN216300150U
Application number: CN202122756478.5U
Authority: CN
Inventors: 孙亚飞; 卢鑫; 黄鸿胤; 吴臣君; 陈菲; 赵新福; 樊维超
Original assignee: Commercial Aircraft Corp of China Ltd; Shanghai Aircraft Manufacturing Co Ltd
Current assignee: Commercial Aircraft Corp of China Ltd; Shanghai Aircraft Manufacturing Co Ltd
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2022-04-15
Anticipated expiration: 2031-11-11

Abstract

The utility model discloses a forming tool, and belongs to the technical field of preforming processes. The forming tool is used for extruding a plane hole of a piece to be formed into a flanging hole, and comprises a forming insert, a forming die and a lower pressing die, wherein a flanging groove is concavely arranged on a first end surface of the forming insert along the thickness direction; the forming insert is detachably embedded in the mounting groove, and a first end surface of the forming insert is flush with the upper end surface of the forming die; one end face, close to the forming insert, of the lower pressing die is convexly provided with a flanging boss along the thickness direction, and the flanging boss is matched with the flanging groove; the to-be-preform is configured to be sandwiched between the molding die and the lower die. According to the actual processing demand, can change the shaping of different models on the moulded die and insert, the shaping frock can be in waiting to carry out the flanging hole of preforming different models on the piece, enlarges application scope, convenient to use and simple structure.

Description

Forming tool

Technical Field

The utility model relates to the technical field of preforming processes, in particular to a forming tool.

Background

The rigidity of the composite rib part of the civil aircraft is improved by adding the ribs, the rib part close to the root of the beam needs to be provided with holes for maintenance, and the flanging holes can realize the functions of maintaining the holes and increasing the rigidity at the same time, so that the use of the ribs can be reduced, and the weight reduction is facilitated.

At present, the preforming of a C-shaped structure is realized by adopting a thermal diaphragm preforming process, the flat plate layer is bent into the C-shaped structure under the action of heating and vacuum bag pressing, but when a sunken flanging hole is contained in the C-shaped structure, the bending of the C-shaped structure and the bending of the flanging hole structure need to be finished simultaneously, the vacuum bag is difficult to compact at the position of the flanging hole, the hole diameters of various types exist in the development process of the flanging hole structure, and the existing tool cannot realize the preforming of the flanging hole and the development process of the flanging hole with various sizes.

Therefore, it is desirable to provide a forming tool to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a forming tool, which can perform a flanging hole structure in advance according to actual requirements, can perform flanging holes of different types on a piece to be formed in advance, and has a wide application range.

In order to realize the purpose, the following technical scheme is provided:

the utility model provides a shaping frock for the plane hole extrusion of treating the preforming piece is into the turn-ups hole, includes:

the first end surface of the forming insert is concavely provided with a flanging groove along the thickness direction;

the forming die is concavely provided with a mounting groove, the forming insert is detachably embedded in the mounting groove, and the first end surface of the forming insert is flush with the upper end surface of the forming die;

a flanging boss is convexly arranged on one end surface close to the forming insert along the thickness direction, and the flanging boss is matched with the flanging groove;

the to-be-preformed piece is configured to be clamped between the forming die and the lower die, and the flanging boss and the flanging groove form an extrusion space of the flanging hole.

As an alternative of the forming tool, the forming tool further comprises a first pre-forming pressing plate, wherein the first pre-forming pressing plate can be pressed at the outer edge of the flanging hole which is prefabricated by the to-be-formed piece and used for fixing the position of the to-be-formed piece.

As an alternative of the forming tool, the forming tool further comprises a guide post, a first through hole is formed in the center of the flanging boss, a second through hole is formed in the center of the forming insert, the second end of the guide post is arranged in the second through hole, and the first end of the guide post can penetrate through the first through hole.

As an alternative of the forming tool, the first end of the guide post is in the shape of a semicircular sphere.

As an alternative of the forming tool, the forming tool further comprises an elastic supporting piece arranged between the flanging boss and the flanging groove; when there is no external pressure, the elastic support member can support the lower pressure film so that a gap exists between the to-be-preformed member and the lower pressure film.

As an alternative of the forming tool, the elastic supporting piece comprises a spring, the first end of the spring is abutted to the flanging boss, and the second end of the spring is abutted to the groove bottom of the flanging groove.

As an alternative scheme of the forming tool, the springs are arranged in a plurality of numbers, and the springs are arranged around the central axis of the flanging groove at intervals.

As an alternative of the forming tool, the elastic supporting piece comprises two annular magnets, and the two annular magnets repel each other.

As an alternative to the forming tool, an end face of the lower die, which is far away from the forming insert, is used for bearing external pressure.

Compared with the prior art, the utility model has the beneficial effects that:

according to the forming tool provided by the utility model, the mounting groove is concavely arranged on the forming die, the forming insert is detachably embedded in the mounting groove, the flanging groove of the forming insert is matched with the flanging boss of the lower pressing die, the plane hole of the to-be-formed piece can be extruded into the flanging hole, the forming insert of different types can be replaced on the forming die according to the actual processing requirement, the flanging holes of different types can be processed on the to-be-formed piece by the forming tool, the application range is expanded, the use is convenient, and the structure is simple.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a schematic view of a to-be-preformed piece with a planar aperture in an embodiment of the present invention;

FIG. 2 is a schematic view of a to-be-preformed member with flanged holes in an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of the forming tool in an initial state according to the embodiment of the utility model;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is a schematic structural diagram of the forming tool in an operating state according to the embodiment of the present invention;

fig. 6 is a partially enlarged view of fig. 5 at B.

Reference numerals:

1. forming an insert; 2. forming a mould; 3. pressing a die; 4. preparing a preformed piece; 5. a first pre-forming platen; 6. a guide post; 7. an elastic support member;

11. a flanging groove; 12. a second through hole;

21. mounting grooves;

31. a flanging boss; 32. a first through hole;

41. a planar hole; 42. flanging holes; 43. and (7) folding edges.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

The utility model belongs to the field of composite material preforming process, and is used for preforming a C-shaped structure composite material part containing flanging holes, wherein the prepreg is a unidirectional tape, a fabric and the like.

Example one

In order to process flanging holes of different models according to actual requirements, and the application range is wide, the embodiment provides a forming tool, and the specific content of the embodiment is described in detail below with reference to fig. 1 to 6. As shown in fig. 1 and 2, the molding tool is used to extrude a planar hole 41 of the member 4 to be preformed into a burring hole 42.

As shown in fig. 3 and 4, the forming tool includes a forming insert 1, a forming die 2 and a lower press die 3, wherein a first end surface of the forming insert 1 is concavely provided with a flanging groove 11 along a thickness direction. The forming die 2 is concavely provided with a mounting groove 21, the forming insert 1 is detachably embedded in the mounting groove 21, and the first end surface of the forming insert 1 is flush with the upper end surface of the forming die 2. One end face, close to the forming insert 1, of the lower pressing die 3 is convexly provided with a flanging boss 31 along the thickness direction, the flanging boss 31 is matched with the flanging groove 11, and one end face, far away from the forming insert 1, of the lower pressing die 3 is used for bearing the pressure of an external gravity press. The preform 4 is configured to be sandwiched between the molding die 2 and the lower press die 3, and the burring boss 31 and the burring groove 11 form a pressing space of the burring hole 42. The inside of the flanging groove 11 is in an inverted truncated cone shape.

In short, the forming tool provided by the utility model has the advantages that the forming die 2 is concavely provided with the mounting groove 21, the forming insert 1 is detachably embedded in the mounting groove 21, the flanging groove 11 of the forming insert 1 is matched with the flanging boss 31 of the lower pressing die 3, the plane hole 41 of the to-be-formed piece 4 can be extruded into the flanging hole 42, the forming insert 1 with different types can be replaced on the forming die 2 according to the actual processing requirement, the forming tool can process the flanging hole 42 with different types on the to-be-formed piece 4, the application range is expanded, the use is convenient, and the structure is simple.

In some applications, the flanging holes 42 are preformed in a hot membrane preform by placing the forming tool in a membrane, heating and evacuating the membrane using membrane bag press technology.

In other application scenarios, a press apparatus is used, which presses the lower press die 3 against the forming die 2 to extrude the planar hole 41 of the to-be-preformed member 4 into the flanged hole 42.

Further, as shown in fig. 3 and 5, the forming tool further includes a first pre-forming press plate 5, and the first pre-forming press plate 5 can be pressed at the outer edge of the pre-flanging hole 42 of the to-be-formed member 4 for fixing the position of the to-be-formed member 4.

Further, as shown in fig. 4 and 6, the forming tool further includes a guide post 6, a first through hole 32 is formed in the center of the flanging boss 31, a second through hole 12 is formed in the center of the forming insert 1, a second end of the guide post 6 is disposed in the second through hole 12, and a first end of the guide post 6 can pass through the first through hole 32. Specifically, the first through hole 32, the planar hole 41, and the second through hole 12 are coaxially arranged. In the process that the lower die 3 presses the piece to be preformed 4 downwards, the guide columns 6 guide the lower die 3 to move along the central axis of the plane hole 41 all the time, and the processing quality of the forming tool is guaranteed.

Further, as shown in fig. 6, the first end of the guide post 6 has a semicircular spherical shape. The first end of the guide post 6 is set to be in the shape of a semicircular ball, so that when a diaphragm bag pressing technology is adopted, the guide post 6 is prevented from puncturing a vacuum bag in the process of vacuumizing the vacuum bag to press the vacuum bag.

Further, as shown in fig. 4 and 6, the forming tool further includes an elastic support 7 disposed between the flange boss 31 and the flange groove 11, on one hand, when there is no external pressure, the elastic support 7 can support the lower pressing film 3, so that a gap exists between the to-be-preformed member 4 and the lower pressing film 3, and it is ensured that the to-be-preformed member 4 and the lower pressing film 3 do not contact and deform under pressure; on the other hand, the device is used for buffering the downward pressure of the lower pressing die 3 on the to-be-preformed piece 4, reducing the downward pressing speed of the lower pressing die 3 and improving the processing effect on the to-be-preformed piece 4. During the hot membrane preforming: when the thermal diaphragm machine is heated to a certain temperature, vacuum is pumped, the elastic support 7 deforms under the pressure of the vacuum bag, and the lower die 3 can compact the plane hole 41 into the flanging hole 42.

Further, the elastic support 7 comprises a spring, a first end of which abuts against the flanging boss 31 and a second end of which abuts against the groove bottom of the flanging groove 11.

Further, the spring is provided in plurality, and the plurality of springs are arranged at intervals around the central axis of the burring groove 11. Through the quantity and the circumferential interval arrangement of addding the spring, make the cushioning effect evenly distributed that the spring produced, avoid unbalance.

In the preform 4 to be formedOn the upper partBe provided with preforming location opening, place the shaping frock in the vacuum bag heating and evacuation, realize in the preforming of once hot diaphragm, the bending of hem 43 and the preforming of flanging hole 42. The preform 4 is formed into a C-shaped configuration with the flanges 43 at the two ends.

The process for manufacturing the to-be-preformed piece 4 of the present embodiment is as follows:

1) and manufacturing a molding tool according to the part digifax of the to-be-preformed piece 4 with the flanging hole 42. The forming tool comprises a forming die 2 embedded with a forming insert 1, a lower pressing die 3, a first pre-forming pressing plate 5 and a guide column 6, as shown in fig. 3.

2) The to-be-preformed member 4 containing the flanging hole 42 is converted from a formed member structure into an unshaped member structure as shown in fig. 2 and an unshaped member structure as shown in fig. 1.

3) And paving a prepreg flat plate on the platform.

4) And cutting the laid prepreg flat plate according to the size of the unmolded part to obtain the required allowance contour, the contour of the plane hole 41 and the preformed positioning opening.

5) Transferring the cut flat prepreg onto a forming die 2, then placing a first pre-forming press plate 5, placing a spring on a forming insert 1, keeping a lower press die 3 at a position above the flat prepreg, then enabling the lower press die 3 to descend to a theoretical thickness position of a to-be-formed piece 4 along a guide column 6 under the action of heating and vacuum bag pressure, and simultaneously bending a flanging hole 42 and a flanging 43 of the flat prepreg to obtain the required to-be-formed piece 4 with a C-shaped structure of the flanging hole 42.

Example two

Compared with the first embodiment, the basic structure of the forming tool provided in this embodiment is the same as that of the first embodiment, and only the arrangement of the elastic supporting member 7 is different, and the structure the same as that of the first embodiment is not described again in this embodiment.

Further, the elastic support 7 includes two ring magnets, and the two ring magnets repel each other. Specifically, one of the ring magnets is bonded to the lower surface of the flange boss 31; and the other annular magnet is adhered to the bottom of the flanging groove 11.

1) according to a part model of a to-be-preformed piece 4 with a flanging hole 42, a forming tool is manufactured, and the forming tool comprises a forming die 2 embedded with a forming insert 1, a lower pressing die 3, a first pre-forming pressing plate 5 and a guide column 6, as shown in FIG. 3.

3) And paving a prepreg flat plate on the platform.

5) Transferring the cut prepreg flat plate to a forming die 2, then placing a first preforming pressing plate 5, placing two annular magnets along a guide post 6 in an extrusion space between a lower pressing die 3 and a forming insert 1, keeping the lower pressing die 3 at the farthest position above the prepreg flat plate by utilizing the action of like-pole repulsion of the magnet pieces, then enabling the lower pressing die 3 to descend to the theoretical thickness position of a to-be-formed piece 4 along the guide post 6 under the action of heating and vacuum bag pressure, and simultaneously bending a flanging hole 42 and a flanging 43 of the prepreg flat plate to obtain the to-be-formed piece 4 with the required C-shaped structure of the flanging hole 42.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A molding tool for extruding a planar hole (41) of a piece (4) to be molded into a flanging hole (42), comprising:

the forming insert comprises a forming insert (1), wherein a first end surface of the forming insert (1) is concavely provided with a flanging groove (11) along the thickness direction;

the forming die (2) is concavely provided with a mounting groove (21), the forming insert (1) is detachably embedded in the mounting groove (21), and the first end surface of the forming insert (1) is flush with the upper end surface of the forming die (2);

a flanging boss (31) is convexly arranged on one end surface of the lower pressing die (3) close to the forming insert (1) along the thickness direction, and the flanging boss (31) is matched with the flanging groove (11);

the to-be-preformed piece (4) is configured to be clamped between the forming die (2) and the lower die (3), and the flanging boss (31) and the flanging groove (11) form a pressing space of the flanging hole (42).

2. The forming tool according to claim 1, characterized by further comprising a first pre-forming press plate (5), wherein the first pre-forming press plate (5) can be pressed on the outer edge of the flanging hole (42) of the to-be-formed piece (4) for fixing the position of the to-be-formed piece (4).

3. The forming tool according to claim 1, further comprising a guide post (6), wherein a first through hole (32) is formed in the center of the flanging boss (31), a second through hole (12) is formed in the center of the forming insert (1), a second end of the guide post (6) is arranged in the second through hole (12), and a first end of the guide post (6) can penetrate through the first through hole (32).

4. The forming tool according to claim 3, characterized in that the first end of the guide post (6) is in the shape of a semi-spherical ball.

5. The forming tool according to claim 1, further comprising an elastic support member (7) arranged between the flanging boss (31) and the flanging groove (11);

when there is no external pressure, the elastic support (7) is capable of supporting the press film (3) with a gap between the to-be-preformed member (4) and the press film (3).

6. The forming tool according to claim 5, characterized in that the elastic support (7) comprises a spring, a first end of the spring abuts against the flanging boss (31), and a second end of the spring abuts against the groove bottom of the flanging groove (11).

7. The forming tool according to claim 6, characterized in that a plurality of springs are arranged and arranged at intervals around the central axis of the flanging groove (11).

8. The molding tool according to claim 5, characterized in that the elastic support (7) comprises two ring magnets, and the two ring magnets repel each other.

9. The forming tool according to claim 1, characterized in that an end face of the lower die (3) away from the forming insert (1) is used for bearing external pressure.