Pressing and liquid filling superposition forming die for airplane special-shaped component

Abstract

The utility model provides an airplane special-shaped component pressure falling and liquid filling superposition forming die which comprises a lower die, a lower die cavity used for forming a special-shaped component is formed in the middle of the top of the lower die, and the lower die cavity is matched with an upper die cavity in the bottom of an upper die. The die further comprises a blank holder used for pressing the edge of a blank, an upper die penetrating hole is machined in the middle of the blank holder, positioning bosses are symmetrically arranged at the two ends of the bottom of the blank holder, and the positioning bosses are matched with U-shaped grooves in the two ends of the top of the lower die. A blank baffle is arranged on the periphery of a lower die cavity of the lower die, and a positioning pin hole is formed in the lower die cavity. A liquid inlet hole is formed in the lower die, and the bottom end of the liquid inlet hole is connected with an external hose. According to the forming die, pressure falling forming and liquid filling forming can be used in an overlapped mode, pressure falling forming is used as pre-forming of a product, liquid filling forming is used as final forming of the product, springback can be obviously reduced, and the forming quality is improved.

Description

Technical Field

[0001] The utility model relates to the field of aviation equipment manufacturing, in particular to a die for forming special-shaped aircraft components by pressure drop and liquid filling. Background Art

[0002] The inner skin of the door of a certain type of aircraft refueling pod is a multi-curved ribbed special-shaped structure. Conventional drop forming has many defects such as easy rebound, low forming accuracy, poor surface quality, uneven material thickness, large residual stress, and difficult forming of local complex structures. Utility Model Content

[0003] The purpose of the utility model is to provide a die for superimposed forming of aircraft special-shaped components by pressure drop and liquid filling. This forming die can superimpose pressure drop forming and liquid filling forming, using pressure drop forming as the pre-forming of the product and liquid filling forming as the final forming of the product, which can significantly reduce springback and improve forming quality.

[0004] In order to achieve the above technical features, the purpose of the present invention is achieved as follows: a die for forming aircraft special-shaped components by pressure drop and liquid filling, comprising a lower die, a lower die cavity for forming the special-shaped component is provided at the top middle portion of the lower die, the lower die cavity being matched with an upper die cavity at the bottom of the upper die;

[0005] It also includes a blank holder ring for pressing the edge of the blank, the middle part of the blank holder ring is processed with an upper mold through hole, and positioning bosses are symmetrically provided at both ends of the bottom of the blank holder ring, and the positioning bosses match the U-shaped grooves at both ends of the top of the lower mold;

[0006] A blank baffle is provided on the periphery of the lower die cavity of the lower die, and a positioning pin hole is provided on the lower die cavity;

[0007] A liquid inlet hole is processed on the lower mold, and the bottom end of the liquid inlet hole is connected to an external hose.

[0008] The bottom plate edge of the lower mold is provided with a bottom bolt groove for being fixedly connected to the fixed platform of the press.

[0009] The edge of the top plate of the upper mold is provided with a top bolt groove for being fixedly connected to the drawing slide block of the press.

[0010] The edge of the top plate of the blank holding ring is provided with a blank holding ring bolt groove for being fixedly connected to the blank holding slide block of the press.

[0011] The two outer sides of the lower mold are symmetrically installed with lower mold hanging handles;

[0012] The two outer sides of the blank holder are symmetrically provided with blank holder hanging handles;

[0013] Two outer sides of the upper mold are symmetrically provided with hanging rings.

[0014] The lower mold, upper mold and pressure ring are all made of cast steel materials.

[0015] A guide plate is fixed on the outer wall of the positioning boss in sliding contact with the U-shaped groove; the guide plate is a self-lubricating graphite copper guide plate.

[0016] The end faces of the lower mold and the pressure ring that match each other are provided with a plurality of limit blocks.

[0017] A limiting column is provided between the upper mold and the pressure ring.

[0018] The utility model has the following beneficial effects:

[0019] 1. This forming die can combine pressure forming and liquid filling forming, with pressure forming as the pre-forming of the product and liquid filling forming as the final forming of the product, which can significantly reduce springback and improve forming quality.

[0020] 2. The main structure of the mold is made of cast steel, and the working surface is processed by CNC, thus ensuring the forming accuracy.

[0021] 3. The working limit position and fitting clearance of the mold can be adjusted by adding or removing precision washers at the mold limit block.

[0022] 4. The mold guide plate adopts self-lubricating graphite copper guide plate, which is wear-resistant and has a long service life.

[0023] 5. The liquid channel, liquid outlet and external hose are all set on the lower mold, which makes it easy to connect with the hydraulic system.

[0024] 6. Some local small bosses on the main structure of the mold can be used as auxiliary references during mold processing and clamping and timing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a three-dimensional diagram from the first perspective of the present invention.

[0027] Figure 2 This is a three-dimensional diagram from the second perspective of the present invention.

[0028] Figure 3 This is a three-dimensional diagram from the third perspective of the present invention.

[0029] Figure 4 This is the internal structure diagram of the lower mold of this utility model.

[0030] Figure 5 This is the internal structure diagram of the upper mold of this utility model.

[0031] Figure 6 This is a structural diagram of the utility model installed on a press.

[0032] Figure 7 This is a three-dimensional diagram from the first perspective of the special-shaped component to be formed in the present invention.

[0033] Figure 8 This is a three-dimensional diagram from the second perspective of the special-shaped component to be formed in the present invention.

[0034] In the figure: lower mold 1, U-shaped groove 2, positioning boss 3, lower mold hanging handle 4, guide plate 5, blank holder 6, blank holder hanging handle 7, blank holder bolt groove 8, lifting ring 9, upper mold through hole 10, upper mold 11, top bolt groove 12, limiting column 13, external hose 14, bottom bolt groove 15, liquid inlet hole 16, positioning pin hole 17, blank baffle 18, limiting block 19, lower mold cavity 20, upper mold cavity 21, blank holder slider 22, drawing slider 23, special-shaped component 24, fixing platform 25. DETAILED DESCRIPTION

[0035] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0036] See also Figure 1-8 A die for superimposed pressure-drop and liquid-filling forming of aircraft special-shaped components comprises a lower die 1, with a lower die cavity 20 for forming special-shaped components 24 provided at the top middle portion of the lower die 1. The lower die cavity 20 cooperates with the upper die cavity 21 at the bottom of the upper die 11. The die also comprises a blank holder 6 for pressing the edge of the blank. The middle portion of the blank holder 6 is machined with an upper die through-hole 10. Positioning bosses 3 are symmetrically provided at both ends of the bottom of the blank holder 6. The positioning bosses 3 cooperate with the U-shaped grooves 2 at both ends of the top of the lower die 1. A blank baffle 18 is provided on the periphery of the lower die cavity 20 of the lower die 1, and a positioning pin hole 17 is provided in the lower die 20. A liquid inlet 16 is machined on the lower die 1, and the bottom end of the liquid inlet 16 is connected to an external hose 14. Pressure-drop forming and liquid-filling forming can be used in a superimposed manner, with pressure-drop forming as the pre-forming of the product and liquid-filling forming as the final forming of the product, which can significantly reduce springback and improve forming quality. During specific use, the lower die cavity 20 and the upper die cavity 21 at the bottom of the upper die 11 are first subjected to drop forming, and then flexible liquid filling drawing or liquid filling bulging is performed using high-pressure liquid through the external hose 14.

[0037] Furthermore, the bottom plate edge of the lower mold 1 is provided with a bottom bolt groove 15 for being fixedly connected to the fixed platform 25 of the press. The bottom bolt groove 15 facilitates the fixing of the lower mold 1 to the fixed platform 25 of the press.

[0038] Further, the top plate edge portion of the upper mold 11 is provided with a top bolt groove 12 for being fixedly connected to the drawing slide 23 of the press. The top bolt groove 12 facilitates the upper mold 11 to be fixedly connected to the drawing slide 23 of the press.

[0039] Furthermore, the top plate edge of the blank holder 6 is provided with a blank holder bolt groove 8 for being fixedly connected to the blank holder slide 22 of the press. The blank holder bolt groove 8 facilitates the blank holder 6 to be fixedly connected to the blank holder slide 22 of the press.

[0040] Furthermore, lower die hanging handles 4 are symmetrically mounted on the two outer sides of the lower die 1. The lower die hanging handles 4 facilitate the hoisting of the lower die 1.

[0041] Furthermore, the two outer sides of the blank holder 6 are symmetrically provided with blank holder hanging handles 7 ; the blank holder 6 can be easily hoisted by the above-mentioned blank holder hanging handles 7 .

[0042] Furthermore, the two outer sides of the upper mold 11 are symmetrically provided with hanging rings 9. The hanging rings 9 facilitate the upper mold 11 to be hoisted.

[0043] Furthermore, the lower mold 1, the upper mold 11 and the blank holder 6 are all made of cast steel, and the working surface is processed by CNC.

[0044] Furthermore, a guide plate 5 is fixed on the outer wall of the positioning boss 3 that is in sliding contact with the U-shaped groove 2; the guide plate 5 is made of self-lubricating graphite copper guide plate, which is wear-resistant and has a long service life.

[0045] Furthermore, the end faces of the lower die 1 and the blank holder 6 that match each other are provided with a plurality of limit blocks 19. The limit blocks 19 ensure the reliability of fixing the blank.

[0046] Furthermore, a limiting column 13 is provided between the upper mold 11 and the blank holder 6. The limiting column 13 can realize the positioning between the upper mold 11 and the blank holder 6.

[0047] Working process and principle of this utility model:

[0048] The mold is structurally provided with a guide plate for guiding the mold component during movement, a limit block is provided for limiting the mold component at the working limit position, a lifting handle or a lifting ring is provided on the mold component for lifting and shifting the mold, and a blank baffle and a positioning pin are provided in the product margin area or cutting area on the lower mold for positioning and limiting the blank to prevent the blank from moving and dislocating during the forming process. A liquid channel and an external hose are provided on the lower mold, which can be connected to an external hydraulic system to use high-pressure liquid for flexible liquid filling drawing or liquid filling bulging. On the basis of the existing traditional double-slide four-column press, a set of high-pressure water system is added to connect to the mold to realize its liquid filling forming function. There is no need to purchase special liquid filling forming equipment separately, which can greatly reduce equipment and production costs.

[0049] The lower die is mounted on the fixed table of a double-slide four-column press, the blank holder is mounted on the blank holder slide, and the upper die is mounted on the drawing slide. When the die is working, the blank holder is first driven downward by the blank holder slide, applying appropriate pressure to the edge of the blank to control and improve the material's flow properties and effectively prevent wrinkling. The drawing slide then drives the upper die downward to achieve conventional drop forming. The external high-pressure water system is then activated to fill the lower die with high-pressure liquid to achieve liquid-filled forming. This has the advantages of a large drawing ratio, high forming limit, high dimensional accuracy, good surface quality, uniform wall thickness distribution, low springback, fewer passes, and low cost.

Claims

1. A die for forming aircraft special-shaped components by pressure drop and liquid filling, characterized in that: The lower mold (1) comprises a lower mold cavity (20) for forming a special-shaped component (24) provided at the top middle portion of the lower mold (1), and the lower mold cavity (20) cooperates with the upper mold cavity (21) at the bottom of the upper mold (11); It also includes a blank holder (6) for pressing the edge of the blank, the middle portion of the blank holder (6) is processed with an upper mold through hole (10), and positioning bosses (3) are symmetrically provided at both ends of the bottom of the blank holder (6), and the positioning bosses (3) cooperate with the U-shaped grooves (2) at both ends of the top of the lower mold (1); A blank baffle (18) is provided on the periphery of the lower die cavity (20) of the lower die (1), and a positioning pin hole (17) is provided on the lower die cavity (20); The lower mold (1) is machined with a liquid inlet hole (16), and the bottom end of the liquid inlet hole (16) is connected to an external hose (14).

2. The die for forming aircraft special-shaped components by pressure drop and liquid filling according to claim 1, characterized in that: The bottom plate edge of the lower mold (1) is provided with a bottom bolt groove (15) for being fixedly connected to the fixed platform (25) of the press.

3. The die for forming aircraft special-shaped components by pressure drop and liquid filling according to claim 1, characterized in that: A top bolt groove (12) for fixedly connecting to a drawing slide block (23) of a press is provided at the edge of the top plate of the upper mold (11).

4. The die for forming aircraft special-shaped components by pressure drop and liquid filling according to claim 1, characterized in that: The edge portion of the top plate of the blank holding ring (6) is provided with a blank holding ring bolt groove (8) for being fixedly connected to the blank holding slide block (22) of the press.

5. The die for forming aircraft special-shaped components by pressure drop and liquid filling according to claim 1, characterized in that: The two outer sides of the lower mold (1) are symmetrically mounted with lower mold hanging handles (4); The two outer sides of the blank holder (6) are symmetrically provided with blank holder hanging handles (7); Hanging rings (9) are symmetrically mounted on the two outer sides of the upper mold (11).

6. The die for forming aircraft special-shaped components by pressure drop and liquid filling according to claim 1, characterized in that: The lower mold (1), the upper mold (11) and the pressure ring (6) are all made of cast steel.

7. The die for forming aircraft special-shaped components by pressure drop and liquid filling according to claim 1, characterized in that: A guide plate (5) is fixed on the outer wall of the positioning boss (3) in sliding contact with the U-shaped groove (2); the guide plate (5) is a self-lubricating graphite copper guide plate.

8. The die for forming aircraft special-shaped components by pressure drop and liquid filling according to claim 1, characterized in that: The end surfaces of the lower mold (1) and the pressure ring (6) that match each other are provided with a plurality of limit blocks (19).

9. The die for forming aircraft special-shaped components by pressure drop and liquid filling according to claim 1, characterized in that: A limiting column (13) is provided between the upper mold (11) and the pressure ring (6).

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