CN207547357U - For being molded the composite tooling of male bend side ribbed part - Google Patents

Abstract

The utility model relates to a compound tooling for forming convex and bent rib-shaped parts, which is used for hydraulic forming of rubber bags. The compound tooling comprises: a base (1); arranged on the base (1) and having a convex The punch mold tire (3) of the shape of flange; Arrange on the base (1), be positioned at the male flange side of described punch mold tire (3) and be spaced apart from described punch mold tire (3) a side pressure block (2) with a distance (D); and an adjusting device for adjusting the distance (D) between the punch tire (3) and the side pressure block (2). The composite tool for forming ribbed parts with convex flanges can be adapted in a simple manner to workpieces of different sizes.

Description

Composite Tooling for Forming Ribs with Convex Edges

technical field

The utility model relates to a compound tooling for forming convex and bent rib-shaped parts, which is used for hydraulic forming of rubber bags.

Background technique

Sheet metal parts are the main components of aerospace, and sheet metal parts account for more than 60% of the total aircraft structural parts. In order to improve the service life of the aircraft, aircraft sheet metal parts are required to have higher forming accuracy, and manual knocking and repairing of out-of-tolerance parts is prohibited. Precision forming stage of gold parts. At present, the main forming process and precision control of aircraft sheet metal parts are still mostly at the stage of prototype and manual exploration. Traditional forming methods such as stretching, gate pressing, and falling forming have poor precision and cannot meet the requirements. There is an urgent need for other More advanced molding technology takes its place. The emergence of rubber bag hydroforming technology has made it possible for the manufacture of aircraft complex sheet metal parts to be gradually replaced by rubber bag hydroforming. At present, rubber bladder hydroforming has become an important forming method to improve the forming quality of sheet metal parts in modern aircraft production. Applying rubber bag hydroforming technology to the field of aerospace manufacturing will greatly improve the strength of the body, reduce the weight of the aircraft, and promote the development of my country's aviation manufacturing technology.

In particular, bladder hydroforming offers the following advantages:

-Rubber bladder hydroforming is a static pressure forming process. During the forming process, the rubber bladder is always close to the parts, so there is no scratch on the surface of the parts, the damage rate inside the material is greatly reduced, and the fatigue strength of the parts is high. Under the action of high pressure and friction, the plasticity of the material can be fully exerted, the springback of the parts is small, and the accuracy of the molding is high.

-Only one rigid half-mold is used for forming, which simplifies the mold, saves the workload of repairing the clearance of the punch and die, and takes less time to prepare the press. Even if the trial mold and molding are carried out, the time is reduced by more than 50%, and the production cycle is short. .

-Because multiple molds can be placed on the workbench at the same time, multiple different types of parts can be formed in one cycle at the same time, and the production efficiency is high. Sheets of different materials and thicknesses can be formed with the same set of molds, and products that require more than two processes can also be formed with the same mold. During the molding process, the pressure of the rubber is uniform, there is no stress concentration, and the mold is in a three-dimensional compressed state, and the requirements for the mold material are not high. Therefore, the mold cost can be reduced by about 80% compared with the usual mold.

- It can form parts with complex shapes, such as non-axisymmetric parts, inclined bottom parts, inclined flange parts and convex and concave parts, and can complete the work of sinking and trimming at the same time. It can partially replace the rigid mold blanking, bending and deep drawing and other processes.

-Suitable for forming materials with poor formability or high strength, such as aluminum alloy, magnesium alloy, titanium alloy, stainless steel and high-strength low-alloy steel. It can also form composite materials, which is very helpful for reducing the weight of parts.

As mentioned above, the rubber bladder hydroforming method can be used to form parts with more complex shapes, which can reduce the number of molding processes, reduce or simplify molds, shorten the production preparation cycle, and improve the surface quality of parts, so as to better solve the rigidity, strength, and The contradiction between size and precision, at the same time, it is also a processing method with low noise, low energy consumption and less pollution. The parts formed by the rubber bladder hydraulic process can be directly used for assembly without trimming or a little trimming, which is very suitable for medium and small batches and trial production.

Because of this, the rubber bladder hydroforming process has many unique advantages compared with the traditional stamping forming, and has become an important forming method for manufacturing frame rib parts in aviation factories.

However, the main defect of the rubber bag hydroforming of large curvature convex flange parts is the wrinkling of the flange part, and the common method to control the wrinkling is to use side pressure blocks.

The principle of anti-wrinkle of the side pressure block is similar to the principle of anti-wrinkle during calendering with a blank holder. Both rely on the friction resistance of the blank holder to increase the radial tensile stress of the material so as to reduce the tangential compressive stress and prevent wrinkling. . However, when the side briquetting block is formed, there is a large gap between the pressing die and the side briquetting block, and most of the materials in the deformation area are suspended in the air, and the suspension material has poor anti-stabilization ability, similar to calendering with a large gap, and the deformation area is more reasonable than the gap It is more prone to wrinkling for calendering. Therefore, the anti-wrinkle of the side pressure block is much more complicated than the anti-wrinkle of the blank holder during calendering. Simultaneously, because sheet material has overlap on side pressing block, when sheet material overlaps too much on side pressing block, the frictional force that sheet material suffers is too large, and sheet material has the danger of pulling crack. Therefore, when the side pressing block is formed, there are two defects in the sheet metal: wrinkling and tearing.

In summary, there is an urgent need to further improve the rubber bag hydroforming technology using side pressure blocks.

Utility model content

The purpose of this utility model is to provide a compound tool for forming convex and curved rib-shaped parts, which is used for rubber bag hydroforming, and the composite tool for forming convex and curved rib-shaped parts can be matched in a simple manner Dimensional workpieces.

This object is achieved by a composite tool for forming convex flange ribs, which is used for rubber bladder hydroforming, wherein the composite tool includes:

- base;

- a punch tire arranged on a base and having the shape of a convex bead on one side;

- side pressure blocks arranged on the base, on the side of the convex flange of the punch tire and at a distance from the punch tire; and

- Adjusting means for adjusting the spacing between said punch tire and said side pressure blocks.

When at least one dimension of the workpiece to be formed is changed or its flange height is changed, the composite tooling for forming convex flange ribs according to the present invention can be adapted to the dimensions of the workpiece to be formed in a simple manner. Matching without the need to manufacture corresponding dedicated punch tires and side pressure blocks used in conjunction with it.

In an advantageous embodiment, said adjustment device comprises:

- positioning means for determining the position of said punch tire on said base;

- at least one shim arranged on the side of said male mold tire opposite to said convex bead side;

- fastening means for securing said at least one spacer on the side of said male tire opposite to said bead side.

In an advantageous embodiment, the positioning mechanism includes a positioning pin and a plurality of positioning holes.

In an advantageous embodiment, the positioning mechanism includes a protrusion and a plurality of locking slots.

In an advantageous embodiment, the positioning means comprise a tongue and groove connection.

In an advantageous embodiment, said positioning means comprise corresponding snap connections provided on the outer peripheral surface of the punch carcass and said seat.

In an advantageous embodiment, the raised portion is configured on the punch carcass, and the raised portion is pressed into a groove in the base.

In an advantageous embodiment, the positioning hole is a waist-shaped hole.

In an advantageous embodiment, the positioning hole is a plurality of holes positioned sequentially from the convex flange side to the opposite side of the convex flange side.

In an advantageous embodiment, the positioning pin is a separate component, and the positioning pin passes through positioning holes in the base and the punch tire.

In an advantageous embodiment, the punch carcass is arranged directly on the base.

In an advantageous embodiment, a blade structure and a spacer are further arranged between the punch tire and the base.

In an advantageous embodiment, the blade structure is connected to the spacer on its side with the cutting edge and to the punch mold on the side opposite to the cutting edge.

In an advantageous embodiment, said spacer, blade structure and said punch tire are fixed to each other by fastening means.

In an advantageous embodiment, the blade structure is dimensioned such that its cutting edge is aligned at least on the side with the convex bead configuration with the outer face of the punch tire.

In an advantageous embodiment, the spacer is dimensioned such that the edge portion of the blade structure is not covered by the spacer.

In an advantageous embodiment, the blade structure is a detachable structure.

In an advantageous embodiment, the fastening means comprise a pin connection and/or a screw connection.

In an advantageous embodiment, the threaded connection is a bolt.

Description of drawings

The utility model is described in detail below according to the accompanying drawings. in,

Fig. 1 shows the front view of the composite tooling for forming convex flange ribs with side pressing blocks according to the present invention;

Fig. 2 shows a partially enlarged cross-sectional view of a composite tooling for forming a convex flange rib with a side pressing block according to an embodiment of the present invention;

Fig. 3 shows a cross-sectional view of a composite tooling for forming a convex flange rib with a side pressing block according to another embodiment of the present utility model;

FIG. 4 shows a detail of FIG. 3 .

Detailed ways

The technical solutions in the preferred embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings, however, the described embodiments are only preferred embodiments of the present invention. Based on the preferred embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Fig. 1 shows a front view of a composite tooling for forming convex and bent ribs with side pressing blocks according to the present invention. Fig. 2 shows a partially enlarged cross-sectional view of a composite tooling for forming a convex flange rib with side pressure blocks according to the present invention, wherein the composite tooling is used in rubber bladder hydroforming technology. The punch tire 3 is arranged on the base 1 , and the workpiece 10 to be formed is placed on the upper surface of the punch tire 3 . The side pressure block 2 is fixed on the base 1 at a distance from the punch tire 3 , and the distance between the punch tire 3 and the side pressure block 2 is D. The side of the side pressure block facing the punch tire 3 is set as a slope, the slope forms an angle α with the bottom surface of the side pressure block, and the distance between the upper surface of the side pressure block and the upper surface of the workpiece 10 to be formed is for H.

During hydroforming of the rubber bladder, the size of the suspended material between the side pressure block 2 and the punch tire 3 will have an impact on the forming effect of the workpiece 10, wherein the suspension between the side pressure block 2 and the punch tire 3 The dimensions of the material are related to the distance D, the angle α and the distance H. Usually, if the distance D between the punch tire 3 and the side pressure block 2 is too large, the deformed section is easy to wrinkle. In addition, if the distance D is set too large or too small, springback will occur after the workpiece 10 is formed.

It can be seen from FIG. 2 that the side pressure block 2 and the punch tire 3 are arranged on the base 1 . The side pressure block 2 surrounds the punch tire 3 on its periphery. The punch tire 3 has a convex bead on one side, and the punch tire 3 has a distance D from the side pressure piece 2 on the side with a convex bead. Here, the punch carcass 3 is arranged directly on the base 1 .

Furthermore, according to the invention, an adjusting device is provided, by means of which the distance D between the punch tire 3 on the side of the bead and the side pressure piece 2 can be adjusted.

For example, a positioning mechanism is provided, which determines the position of the punch tire 3 on the base 1 . The positioning mechanism includes, for example, a positioning pin and a plurality of positioning holes, and the positioning pins cooperate with the positioning holes. For example, the positioning pin is a separate member, such as a screw, a pin, etc., which can pass through positioning holes configured in the base 1 and the punch tire 3 to position the punch tire 3 on the base 1 . The positioning holes can be configured, for example, as waist holes, into which positioning pins can be mounted. The positioning mechanism includes, for example, a protrusion and a plurality of locking grooves. The protrusion is configured on the punch tire 3 , and the protrusion is pressed into the locking grooves in the base 1 . The positioning mechanism comprises, for example, a tongue-and-groove connection. Or the positioning mechanism includes, for example, a corresponding snap connection arranged on the outer peripheral surface of the punch tire 3 and the base 1 . Other adjustable positioning methods are also contemplated.

Furthermore, there are one or more spacers 4 between the side pressure piece 2 and the side pressure piece 2 on the side of the punch tire 3 opposite to the side having the convex bead configuration. On the side where the gasket 4 is arranged, the side pressure block 2, the gasket 4 and the punch tire 3 are fixed by means of releasable fastening means, which can be positioning pins 7 and/or bolts or bolts Group 8. Of course, it is also conceivable to arrange that the side pressure block 2 is only arranged on the side with the convex flange configuration of the punch tire 3. At this time, only the gasket 4 and the punch tire 3 need to be fixed.

According to the invention, the adjustment device can be implemented as a pin connection and/or a screw connection, but also as a snap connection and any detachable connection.

For example, when at least one dimension of the workpiece 10 to be formed changes, the distance D between the punch tire 3 on the side with the convex flange configuration and the side pressure block 2 can be changed by the adjusting device, so that the distance D matches Dimensions of the workpiece 10 to be formed, for example, by loosening the bolts connecting the punch tire to the base and loosening the bolts connecting the side pressure pieces 2, spacers 4 and punch tire 3, and then Adjust the position of the punch tire on the base, add one or more gaskets 4 or remove one or more pads between the side pressure block 2 and the punch tire 3 on the side where the gasket 4 is arranged 4 to change the distance D, after adjusting the distance D, for example, install the positioning pins in the adjusted positioning holes, tighten the base and the punch tire and the side pressure block 2, spacer 4 and the punch tire again 3.

The use of the adjusting device makes it possible to easily vary the distance D between the punch tire 3 on the side with the bead configuration and the side pressure piece 2 depending on the size of the workpiece 10 to be formed. Therefore, there is no need to manufacture special punch tires and side pressure blocks used in conjunction with them for workpieces 10 of various sizes, thereby reducing tooling manufacturing costs.

Furthermore, the punch tire 3 has air outlet holes 11 on the side having the convex bead configuration. When forming by the rubber bag, the gas between the workpiece 10 and the punch tire 3 can be discharged through the air outlet hole and the air outlet groove 12 connected thereto.

Fig. 3 shows a cross-sectional view of the composite tooling for forming convex and flanged ribs with side pressing blocks according to the present invention. As can be seen from FIG. 3 , a blade structure 5 and a spacer 6 are arranged between the punch tire 3 and the base 1 . FIG. 4 clearly shows the blade structure 5 and spacer 6 . The blade structure 5 is connected on its edge-bearing side to the spacer 6 and on the opposite side to the blade structure 5 to the punch tire 3 , which rests on the base 1 on the side facing away from the blade structure 5 . The blade structure 5 is preferably dimensioned such that its cutting edge is aligned with the outer side of the punch tire 3 at least on the side with the convex bead configuration. The spacer 6 is dimensioned such that the cutting edge of the blade structure 5 is not covered by the spacer 6 and is exposed. The spacer 6 is only used to space the edge of the blade structure 5 from the base 1 . The cushion block 6, the blade structure 5 and the punch tire 3 can be fixedly connected by a fastening device, preferably by fastening bolts or positioning pins.

During the rubber bag forming process, the formed workpiece is molded along the convex flange of the punch tire through the rubber bag, and the deformed area is pressed to the edge of the blade structure, so that the material of the workpiece wraps the blade structure tightly and is wrapped under hydraulic pressure. The material of the cutting edge of the tight blade structure is cut by the cutting edge, thereby realizing the trimming of the workpiece. In addition, the blade structure is a detachable structure, so that it can be repaired or replaced with a new blade structure when the blade structure is blunted.

The forming process of the convex flange rib is briefly and exemplarily described below.

After adjusting the distance D between the side of the convex flange configuration and the side pressure block 2 after the punch tire 3 is adjusted, for example, it is determined that the punch tire with the blade structure 5 and the spacer 6 is equipped with the positioning mechanism. Position on the base 1 and fix and fix the punch tire 3, spacer 4 and side pressure block. Then the workpiece 10 to be formed is launched on the punch tire and correspondingly drills a fixing hole on the workpiece 10 to be formed corresponding to the workpiece positioning hole on the punch mold tire, and the positioning pin is introduced in the fixing hole so that the The workpiece 10 to be formed is positioned on the assembled mold described above. Then, the mold for fixing the workpiece 10 to be formed is put into the rubber bag forming machine to realize the molding of the workpiece 10 and trim the edge of the workpiece 10 through the blade structure.

Claims (19)

1. A compound frock for shaping convex edge rib spare, it is used for rubber bag hydraulic forming, its characterized in that, compound frock includes:

a base (1);

a male mold (3) arranged on the base (1) and having a shape of a convex bead on one side;

the lateral pressure blocks (2) are arranged on the base (1), are positioned on one side of the convex bent edge of the male die mould (3) and are separated from the male die mould (3) by a distance (D); and

and the adjusting device is used for adjusting the distance (D) between the male die tire (3) and the side pressing block (2).

2. A composite tooling for forming a convexly curved edge rib as claimed in claim 1, wherein the adjusting means comprises:

a positioning mechanism for determining the position of the male die mould (3) on the base (1);

at least one shim (4) arranged on the side of the male mould (3) opposite to the side of the convex curve;

fastening means for fixing the at least one shim (4) on the side of the male mould (3) opposite to the side of the convex curve.

3. A composite tooling for forming a convexly curved edge rib as claimed in claim 2, wherein the locating mechanism comprises a locating pin and a plurality of locating holes.

4. A composite tooling for forming a convexly curved edge rib as claimed in claim 2, wherein the locating mechanism comprises a raised portion and a plurality of slots.

5. A composite tooling assembly for forming a convexly curved edge rib as claimed in claim 2, wherein the locating mechanism comprises a tongue and groove connection.

6. A composite tooling for forming a male curved edge rib according to claim 2, wherein the positioning mechanism comprises corresponding snap connections provided on the outer peripheral surfaces of the male die (3) and the base (1).

7. A composite tooling for moulding a male curved edge rib according to claim 4, characterised in that the raised portion is configured on the male mould (3) and is pressed into a bayonet slot in the base (1).

8. A composite tooling for forming a convexly curved edge rib as claimed in claim 3, wherein the locating holes are kidney-shaped holes.

9. A composite tooling for forming a convex curved edge rib according to claim 3, wherein the locating holes are a plurality of holes located in sequence from the side of the convex curved edge to the opposite side of the convex curved edge.

10. A composite tooling for forming a male curved edge rib according to claim 3, wherein the locating pins are separate components, and pass through locating holes in the base (1) and the male die tyre (3).

11. A composite tooling for forming a male curved edge rib according to claim 1, characterized in that the male die mould (3) is arranged directly on the base (1).

12. A composite tooling for forming a convexly curved ribbed member according to claim 1, characterized in that a blade structure (5) and a spacer (6) for cutting off the formed workpiece are further arranged between the male die (3) and the base (1).

13. A tooling assembly according to claim 12, wherein the blade structure (5) is connected to the spacer (6) on the side thereof having the cutting edge and to the male mould (3) on the side opposite to the side having the cutting edge.

14. A composite tooling for forming a male curved edge rib according to claim 12, characterized in that the spacer block (6), the blade structure (5) and the male mould blank (3) are fixed to each other by fastening means.

15. A composite tooling for moulding a male curved edge rib according to claim 13, characterised in that the blade structure (5) is dimensioned such that its cutting edge is aligned with the outer side of the male mould (3) at least on the side having the male curved edge configuration.

16. A composite tooling for forming a male curved edge rib according to claim 13, characterized in that the spacer (6) is dimensioned such that the edge portion of the blade structure (5) is not covered by the spacer (6).

17. A composite tooling assembly for forming a convexly curved edge rib as claimed in claim 12, wherein the blade structure is a detachable structure.

18. A composite tooling assembly for forming a male curved edge rib according to claim 2 or 14 wherein the fastening means comprises a bayonet connection and/or a screw connection.

19. A composite tooling for forming a male curved edge rib according to claim 18, wherein the threaded connection is a bolt (8).