阅读说明：本技术 一种飞机大型收口半管类零件的成形模具及成形方法 (Forming die and forming method for large-size closed-up half-tube part of airplane ) 是由 翟攀 车剑昭 杜媛媛 于 2021-07-27 设计创作，主要内容包括：本发明公开了一种飞机大型收口半管类零件的成形模具和成形方法,包括基座组件、支撑组件、侧压组件,基座组件含有模座和定位块,模座上设有弧形的安装槽,安装槽由凸侧滑面、凹侧滑面和底平面组成。凹/凸侧滑面为大角度开角结构,实现凹/凸侧压块的顺利压入,压入后保证凹/凸侧压块与支撑块型面之间均匀的料厚间隙；利用凸侧压块与凹侧滑面贴合,凹侧压块与凸侧滑面贴合,实现成形过程中成形力的传递。利用型面的分型结构,将凹支撑块向凸支撑块方向推动,使支撑组件轮廓减小实现了零件的顺利脱模。最终实现了飞机大型收口半管类零件低成本、高效率的精准成形,对飞机收口半管类零件具有普遍适用性。(The invention discloses a forming die and a forming method for large-scale necking-in half-tube parts of an airplane. The concave/convex side sliding surface is of a large-angle open angle structure, so that the concave/convex side pressing block is smoothly pressed in, and a uniform material thickness gap between the concave/convex side pressing block and the molded surface of the supporting block is ensured after the concave/convex side pressing block is pressed in; the convex side pressing block is attached to the concave side sliding surface, and the concave side pressing block is attached to the convex side sliding surface, so that the transmission of the forming force in the forming process is realized. By utilizing the parting structure of the molded surface, the concave supporting block is pushed towards the convex supporting block, so that the outline of the supporting component is reduced, and the smooth demolding of parts is realized. Finally, the low-cost, efficient and accurate forming of the large-scale closing-in half-tube part of the airplane is realized, and the method has universal applicability to the closing-in half-tube part of the airplane.)

1. A forming die for large-scale closed-up half-tube parts of an airplane is characterized by comprising a base component, a supporting component and a side pressing component, wherein the base component comprises a die holder and a positioning block, an arc-shaped mounting groove is formed in the die holder, the mounting groove consists of a convex side sliding surface, a concave side sliding surface and a bottom plane, the concave side sliding surface and the convex side sliding surface are of open-angle structures, the positioning block is fixed on the bottom plane, one side of the positioning block is a convex vertical surface, the other side of the positioning block is a concave vertical surface, the convex vertical surface is opposite to the concave side sliding surface, and the concave vertical surface is opposite to the convex side sliding surface; the supporting component comprises a convex supporting block, a concave supporting block, two thickness control pieces and a connecting pin, the convex supporting block and the concave supporting block are connected into a whole by the connecting pin, the thickness control pieces are respectively positioned at the gaps of the ends of the two supporting blocks when being connected, the inner sides of the convex supporting block and the concave supporting block are respectively attached to the convex vertical surface and the concave vertical surface of the positioning block, and the outer sides of the convex supporting block and the concave supporting block are attached to the inner surface of the semi-tubular part; the lateral pressure assembly comprises a convex side pressing block and a concave side pressing block. The convex side pressing block is arranged between the concave side sliding surface and the convex supporting block and is attached to the concave side sliding surface, and the concave side pressing block is arranged between the convex side sliding surface and the concave supporting block and is attached to the convex side sliding surface.

2. The forming die for the large-sized closed-up half-tube part of the airplane as claimed in claim 1, wherein the thickness control sheet is a U-shaped metal sheet with two finish machining surfaces, and the dimensional thickness tolerance of the thickness control sheet is +/-0.03 mm.

3. The forming die for the large-sized closed-up half-tube part of the airplane as claimed in claim 1, wherein the opening angle between the concave side sliding surface and the convex side sliding surface is 5-10 degrees greater than the closed-up angle at the bottom end of the half-tube part.

4. A method for forming a large-size closed-up half-tube part of an airplane is characterized by comprising the following steps:

4-1, fixing a positioning block on the bottom plane of a groove of a die holder, fitting the inner side of a convex supporting block with a convex vertical surface of the positioning block, fitting the inner side of a concave supporting block with a concave vertical surface of the positioning block, firmly connecting the convex supporting block with the concave supporting block by using a connecting pin, controlling the tightening force of the connecting pin by using a thickness control sheet at gaps at two ends of the supporting block, and ensuring that the molded surface is not deformed under stress;

4-2, not installing the side pressure assembly, placing the preformed part on the support assembly, and prepressing by a press machine once to ensure that the part is attached to the convex supporting block, the concave supporting block and the positioning block as much as possible;

4-3, attaching the outer side of the convex side pressing block to the concave side sliding surface, installing the convex side sliding block to the inner side of the convex side pressing block along the concave side sliding surface to be contacted with the part, attaching the inner side of the concave side pressing block to the convex side sliding surface, and installing the concave side sliding block to the outer side of the concave side pressing block along the convex side sliding surface to be contacted with the part. The press machine begins to form the part;

4-4, after the part is molded, moving the convex side pressing block and the concave side pressing block out along the concave side sliding surface and the convex side sliding surface respectively, slightly loosening the connecting pin, hoisting the supporting assembly by utilizing a hanger on the supporting assembly, and enabling the inner sides of the convex supporting block and the concave supporting block to slide out along the convex vertical surface and the concave vertical surface of the positioning block, wherein at the moment, the supporting assembly is connected by the connecting pin to form an integral assembly;

4-5, disassembling the connecting pin, taking down the thickness control piece, pushing the concave supporting block towards the convex supporting block at the moment, reducing the outline of the supporting component, taking out the part upwards, and realizing demoulding.

Technical Field

The invention relates to the technical field of aircraft part manufacturing, in particular to a forming die and a forming method of a large-size necking-in half-tube part for an aircraft.

Background

The large closing-up semi-tube part for the airplane is a sheet metal part with the length of more than 1000mm and the section diameter of more than 300mm, and is mainly applied to the surface of an overflow tube of the airplane. The part adopts a fixing mode that the side surfaces of the upper half tube and the lower half tube are overlapped when being assembled, so that the side surface of one half tube part is provided with a inward closing port penetrating through the whole length direction, and the aeronautical manufacturing industry in China basically adopts a processing method of aluminum alloy plastic deformation at normal temperature for processing large half tube parts for airplanes. The traditional aluminum alloy necking-in half tube adopts a two-process forming method at present: the first procedure, ordinary deep drawing forming; and a second procedure, closing the forming die. The first procedure, the appearance of the part is formed in the ordinary deep drawing forming process, and the part is not formed to be closed; in the second procedure, when the traditional die is used for forming and closing up, because the closing up is at the side edge, the pressure of the hydraulic machine is difficult to transmit transversely, and the forming quality is poor; traditional mould is in the back of taking shape the binding off, and the part can't be demolded smoothly, often utilizes slightly sled to carry out the drawing of patterns, and is great to the part injury when the drawing of patterns, easily appears the part defect, and manufacturing efficiency is lower. Therefore, a method which is simple in operation structure and can effectively reduce the rejection rate needs to be considered for forming the large-size necking-in half-tube parts of the airplane.

Disclosure of Invention

The application aims to provide a method for forming large-scale necking-in half-tube parts of an airplane, which can be suitable for design and manufacture of various necking-in half-tube parts.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:

a large-scale necking-in semi-tube part forming die for an airplane comprises a base component, a supporting component and a side pressing component, wherein the base component comprises a die holder and a positioning block, an arc-shaped mounting groove is formed in the die holder and consists of a convex side sliding surface, a concave side sliding surface and a bottom plane, the concave side sliding surface and the convex side sliding surface are of an open-angle structure, the positioning block is fixed on the bottom plane, one side of the positioning block is a convex vertical surface, the other side of the positioning block is a concave vertical surface, the convex vertical surface is opposite to the concave side sliding surface, and the concave vertical surface is opposite to the convex side sliding surface; the supporting component comprises a convex supporting block, a concave supporting block, two thickness control pieces and a connecting pin, the convex supporting block and the concave supporting block are connected into a whole by the connecting pin, the thickness control pieces are respectively positioned at the gaps of the ends of the two supporting blocks when being connected, the inner sides of the convex supporting block and the concave supporting block are respectively attached to the convex vertical surface and the concave vertical surface of the positioning block, and the outer sides of the convex supporting block and the concave supporting block are attached to the inner surface of the semi-tubular part; the lateral pressure assembly comprises a convex side pressing block and a concave side pressing block. The convex side pressing block is arranged between the concave side sliding surface and the convex supporting block and is attached to the concave side sliding surface, and the concave side pressing block is arranged between the convex side sliding surface and the concave supporting block and is attached to the convex side sliding surface.

The method for forming by using the forming die comprises the following steps:

the positioning block is fixed on the bottom plane of the groove of the die holder, the inner side of the convex supporting block is attached to the convex vertical surface of the positioning block, the inner side of the concave supporting block is attached to the concave vertical surface of the positioning block, the convex supporting block and the concave supporting block are firmly connected by using the connecting pin, and the tightening force of the connecting pin is controlled by using the thickness control sheet at the gaps at the two ends of the supporting block, so that the molded surface is ensured not to deform under stress.

2, the side pressing assembly is not installed, the preformed part is placed on the supporting assembly, and the press machine performs prepressing once to ensure that the part is attached to the convex supporting block, the concave supporting block and the positioning block as much as possible;

and 3, attaching the outer side of the convex side pressing block to the concave side sliding surface, installing the convex side sliding block to the inner side of the convex side pressing block along the concave side sliding surface to be contacted with the part, attaching the inner side of the concave side pressing block to the convex side sliding surface, and installing the concave side sliding block to the outer side of the concave side pressing block along the convex side sliding surface to be contacted with the part. The press begins to form the part.

4 after the part is formed, the convex side pressing block and the concave side pressing block are respectively moved out along the concave side sliding surface and the convex side sliding surface, the connecting pin is slightly loosened, the supporting component is lifted by utilizing the hanger on the supporting component, so that the inner side of the convex supporting block and the inner side of the concave supporting block slide out along the convex vertical surface and the concave vertical surface of the positioning block, and at the moment, the supporting component is connected by the connecting pin and is an integral component.

And 5, disassembling the connecting pin, taking down the thickness control piece, pushing the concave supporting block to the convex supporting block at the moment, reducing the outline of the supporting component, and taking out the part upwards to realize demoulding.

According to the method, the basic principle of stamping and profiling molding is utilized, and a concave/convex side sliding surface large-angle open angle structure is utilized, wherein the open angle between the concave side sliding surface and the convex side sliding surface is 5-10 degrees larger than the bottom end closing angle of a half-pipe part, so that smooth pressing of a concave/convex side pressing block is realized, and a uniform material thickness gap between the concave/convex side pressing block and the concave/convex supporting block molded surface is ensured after pressing; the convex side pressing block is jointed with the concave side sliding surface by utilizing the contact of the concave/convex side pressing block and the concave/convex side sliding surface, and the concave side pressing block is jointed with the convex side sliding surface, so that the transmission of the forming force in the forming process is realized. By utilizing the parting structure of the molded surface, the concave supporting block is pushed towards the convex supporting block, so that the outline of the supporting component is reduced, and the smooth demolding of parts is realized. Finally, the low-cost, efficient and accurate forming of the large-scale closing-in half-tube part of the airplane is realized, and the method has universal applicability to the closing-in half-tube part of the airplane.

The present application will be described in further detail with reference to the following drawings and examples.

Drawings

FIG. 1 is a view of a component structure;

FIG. 2 is a view showing the outline of a large-sized necking-in half-tube parting side-pressure forming die;

FIG. 3 is a block diagram of the base assembly;

FIG. 4 is a view of a support assembly;

FIG. 5 is a side pressure block diagram;

the numbering in the figures illustrates: 1. a half-tube part of a necking; 2. a base assembly; 3. a support assembly; 4. a lateral pressure component; 5. a die holder; 6. positioning blocks; 7. a convex side slip surface; 8. a concave side sliding surface; 9. a bottom plane; 10. a convex facade; 11. a concave facade; 12. a convex supporting block; 13. a concave support block; 14. controlling the thickness; 15. the inner side of the convex supporting block; 16. the inner side of the concave supporting block; 17. a convex side pressing block; 18. pressing a concave side block;

Detailed Description

Fig. 1 is a schematic view of a necked-in half-tube component 1.

2-5, the die for forming the large-scale necking-in half-tube part of the airplane comprises a base component 2, a supporting component 3 and a side pressing component 4, wherein the base component 2 comprises a die holder 5 and a positioning block 6, an arc-shaped mounting groove is formed in the die holder 5, the mounting groove consists of a convex side sliding surface 7, a concave side sliding surface 8 and a bottom plane 9, the concave side sliding surface 8 and the convex side sliding surface 7 are both in an open-angle structure, the positioning block 6 is fixed on the bottom plane 9, one side of the positioning block 6 is a convex vertical surface 10, the other side of the positioning block 6 is a concave vertical surface 11, the convex vertical surface 10 is opposite to the concave side sliding surface 8, and the concave vertical surface 11 is opposite to the convex side sliding surface 7; the supporting component 3 comprises a convex supporting block 12, a concave supporting block 13, two thickness control pieces 14 and a connecting pin, the convex supporting block 12 and the concave supporting block 13 are connected into a whole by the connecting pin, the thickness control pieces 14 are respectively positioned at the gaps of the ends of the two supporting blocks when in connection, the inner side 15 of the convex supporting block and the inner side 16 of the concave supporting block are respectively jointed with the convex vertical surface 10 and the concave vertical surface 11 of the positioning block 6, and the outer sides of the convex supporting block 12 and the concave supporting block 13 are jointed with the inner surface of a semi-tubular part; the side pressure assembly 4 includes a male side compact 17 and a female side compact 18. A convex side presser 17 is mounted between the concave side slide surface 8 and the convex support block 12 and abuts the concave side slide surface 8, and a concave side presser 18 is mounted between the convex side slide surface 7 and the concave support block 13 and abuts the convex side slide surface 7.

The method for forming by using the forming die comprises the following steps:

the positioning block 6 is fixed on the bottom plane 9 of the die holder groove, the inner side 15 of the convex supporting block is attached to the convex vertical surface 10 of the positioning block 6, the inner side 16 of the concave supporting block is attached to the concave vertical surface 11 of the positioning block 6, the convex supporting block 12 and the concave supporting block 13 are firmly connected by using the connecting pin, the tightening force of the connecting pin is controlled by using the thickness control piece 14 at the gap of the two ends of the supporting block, and the molded surface is ensured not to deform under stress.

2, the side pressing component 4 is not installed, the preformed part is placed on the supporting component 3, and the press machine performs prepressing once to ensure that the part is attached to the convex supporting block 12, the concave supporting block 13 and the positioning block 6 as much as possible;

3, the outer side of a convex side pressing block 17 is attached to the concave side sliding surface 8, a convex side sliding block 17 is installed to the inner side of the convex side pressing block 17 along the concave side sliding surface 8 to be in contact with the part, the inner side of a concave side pressing block 18 is attached to the convex side sliding surface 7, and a concave side sliding block 18 is installed to the outer side of the concave side pressing block 18 along the convex side sliding surface 7 to be in contact with the part. The press begins to form the part.

4 after the parts are molded, the convex side pressing block 17 and the concave side pressing block 18 are respectively moved out along the concave side sliding surface 8 and the convex side sliding surface 7, the connecting pins are slightly loosened, the supporting component 3 is lifted by utilizing the hanger on the supporting component 3, the inner sides 15 and 16 of the convex supporting blocks slide out along the convex vertical surface 10 and the concave vertical surface 11 of the positioning block 6, and at the moment, the supporting component 3 is connected by the connecting pins to form an integral component.

5, detaching the connecting pin, removing the control thick sheet 14, pushing the concave supporting block 13 to the convex supporting block 12 at the moment, reducing the outline of the supporting component 3, and taking out the part upwards to realize demoulding.