CN-115740221-B - Forming die and hydraulic forming method for M-shaped aircraft longitudinal profile parts

CN115740221BCN 115740221 BCN115740221 BCN 115740221BCN-115740221-B

Abstract

The invention discloses a forming die which comprises a die body and a die cover plate, wherein the die body comprises a bottom plate, die reinforcing bosses and die reinforcing tables, the plurality of die reinforcing tables are respectively arranged at two sides of the bottom plate, the plurality of die reinforcing tables are uniformly distributed at one side of the bottom plate, one die reinforcing table is arranged at the other side of the bottom plate, the die reinforcing tables at two sides of the bottom plate are correspondingly arranged, the plurality of die reinforcing bosses are respectively arranged on the die reinforcing tables, one ends of the die reinforcing bosses are respectively flush with the upper edges at two sides of the bottom plate, the die cover plate is connected with the bottom plate of the die body, and the die cover plate covers parts.

Inventors

Kong Qingmeng
WU YEQIU
TAN REN
LI GUANG
LIU SHAOQING
XU KANGWEI
LI DEHUI
LUO ZHIHUI
ZHONG DONGPING
WEN SONGTAO
HU YALING
CHANG WEI
XU LIPING
HUANG WEI
FAN XIANGLEI

Assignees

江西洪都航空工业集团有限责任公司

Dates

Publication Date: 20260512
Application Date: 20221115

Claims (7)

1. The hydraulic forming method of the M-shaped aircraft longitudinal profile type part using the forming die is suitable for the M-shaped aircraft longitudinal profile type part which is characterized in that the forming die is suitable for being provided with a plurality of die reinforcing bosses which are respectively arranged on two sides of a base plate, a plurality of die reinforcing tables are uniformly distributed on one side of the base plate, one die reinforcing table is arranged on the other side of the base plate, the die reinforcing tables on two sides of the base plate are correspondingly arranged, the die reinforcing bosses are respectively arranged on the die reinforcing tables, one ends of the die reinforcing bosses are respectively flush with the upper edges of two sides of the base plate, the die cover plate is connected with the base plate of the die body, and the die cover plate covers the part, and the hydraulic forming method is characterized by comprising the following steps of: Firstly, adding a process lug at each part notch according to the improvement requirements of a three-dimensional part number model and a process forming scheme by using a digital means and CATIA three-dimensional software, and extracting a material neutral layer of the three-dimensional part model by using the CATIA software to obtain a required numerical control unfolding material; Secondly, in order to limit the material to flow to the low gradient part, so as to ensure the appearance of the part, improve the production efficiency, repair, reform and optimize the forming die, round corners are formed on the non-working surface of the forming die, so as to protect the rubber bag of the machine tool, the bottom plate of the die body is matched with the part, the die cover plate covers the part, and a facet is milled on the die reinforcing table and a pin hole is formed; Thirdly, bending preforming is added, bending lines are calculated by using a digital means according to the number of dies or templates of the parts and the neutral layer characteristics of the materials, bending processing is carried out on the numerical control unfolding material obtained in the first step, preforming is achieved, and a part with V-shaped bent edges is obtained; Fourthly, placing the part with the V-shaped bent edge obtained in the third step on a die body, enabling the position of a process lug on the part to correspond to the position of a die reinforcing boss, then using a drill bit to penetrate upwards from a pin hole at the bottom of the die reinforcing boss until a sample punching point is formed on the process lug, further forming two small opposite bent edges and forming holes, wherein the part is provided with the V-shaped bent edge and the two small opposite bent edges; fifthly, placing the die body on a workbench of a rubber bag hydraulic press, fixing the part obtained in the fourth step on the die body, and covering a die cover plate and rubber to perform hydraulic forming; and sixthly, trimming the process lugs after the hydraulic forming in the fifth step is completed, and carrying out local correction to obtain the M-shaped aircraft longitudinal profile parts.
2. The method of hydroforming a longitudinal section of an M-shaped aircraft according to claim 1, wherein the bottom plate is a V-shaped long plate having a configuration and size matching the configuration and size of the V-shaped flange of the section.
3. The method for hydroforming the longitudinal section parts of the M-shaped airplane as set forth in claim 1, wherein the die reinforcing table has a convex shape, the bottom is flush with the bottoms of the two sides of the bottom plate and is inclined relative to the horizontal plane, the inclination is consistent with the inclination of the V-shaped long plate on one side of the bottom plate, the die reinforcing boss is a hollow trapezoid body, the height of the trapezoid body gradually increases from the flat ends of the upper edges of the two sides of the bottom plate to the ends of the upper edges of the two sides far away from the bottom plate, the flat ends of the upper edges of the two sides of the bottom plate are the open ends of the hollow structure of the die reinforcing boss, and the die reinforcing boss is arranged in the middle of the die reinforcing table.
4. The method for hydroforming the longitudinal section parts of the M-shaped airplane as set forth in claim 1, wherein the mold cover plate is of a cuboid structure at the bottom and is of a triangular structure at the top, the triangular shape and the size of the triangular shape at the top are matched with those of the bottom plate of the mold body, mold positioning pins are arranged at two ends of the top of the mold cover plate, and the mold cover plate is fixedly connected with the bottom plate of the mold body through the mold positioning pins.
5. The method for hydroforming M-shaped aircraft longitudinal profile parts according to claim 1, wherein the numerical control unfolding material is a woolen cut by a numerical control machine tool.
6. The method for hydroforming M-shaped aircraft longitudinal profile parts according to claim 1, wherein the non-working surface rounding radius of the forming die is 8mm.
7. The method for hydroforming M-shaped aircraft longitudinal profile parts according to claim 1, wherein the pin holes are through holes and are positioned at the bottoms of the reinforcing bosses of the die.

Description

Forming die and hydraulic forming method for M-shaped aircraft longitudinal profile parts Technical Field The invention belongs to the technical field of cold process sheet metal forming, and particularly relates to a forming die and a hydraulic forming method for M-shaped aircraft longitudinal profile parts. Background As shown in fig. 1, the longitudinal section part of an aircraft is made of an aviation aluminum material, and the remarkable appearance characteristic of the part is that the bent edges at two sides have a larger gradient and are provided with a hooked edge, the longitudinal dimension is longer, and the cross section of the part is M-shaped (as shown in fig. 2). According to the traditional forming method of the parts, according to the requirements of Q/5A 2239-2017 'plate bending section bar', a manual forming method is adopted, namely, a hand-held hammer is used for gradually shaping a blank until the blank is tightly attached to a die, however, a large number of beating marks are left on the surfaces of the parts by the traditional forming method, so that time and labor are wasted, and the production efficiency is extremely low. In addition, since the slope of the bent edges at two sides is large, the material naturally flows to the lower part in the forming process, the appearance of the part is difficult to be ensured, and the rejection of the part is easy to be caused. Therefore, in order to solve the problems of difficult forming, long time consumption and out-of-tolerance appearance of a certain type of aircraft longitudinal section parts, the invention provides a forming die capable of improving the processing efficiency and the part qualification rate and ensuring the appearance of the part and a hydraulic forming method of the M-shaped aircraft longitudinal section parts, which are the problems to be solved in the invention. Disclosure of Invention Aiming at the prior art, the invention aims to overcome the defects in the prior art and adapt to the actual needs, thereby providing the forming die capable of improving the processing efficiency and the part qualification rate and ensuring the appearance of the part and the hydroforming method of the M-shaped airplane longitudinal section parts. In order to achieve the purpose, the forming die comprises a die body and a die cover plate, wherein the die body comprises a base plate, die reinforcing bosses and die reinforcing tables, the die reinforcing tables are arranged in a plurality and are respectively located on two sides of the base plate, the die reinforcing tables are uniformly distributed on one side of the base plate, one die reinforcing table is arranged on the other side of the base plate, the die reinforcing tables on two sides of the base plate are correspondingly arranged, the die reinforcing bosses are respectively arranged on the die reinforcing tables, one ends of the die reinforcing bosses are respectively flush with the upper edges of the two sides of the base plate, the die cover plate is connected with the base plate of the die body, and the die cover plate covers the part. Further, the bottom plate is a V-shaped long plate, and the structural shape and the size of the bottom plate are matched with those of the V-shaped bent edge of the part. Further, the appearance structure of the die reinforcing table is in a convex shape, the bottoms of the die reinforcing table are flush with the bottoms of the two sides of the bottom plate, the die reinforcing table is inclined relative to the horizontal plane, the inclination is consistent with the inclination of a V-shaped long plate on one side of the bottom plate, the die reinforcing boss is a hollow trapezoid body, the height of the trapezoid body is gradually increased from the upper edge leveling ends on the two sides of the bottom plate to the upper edge ends far away from the two sides of the bottom plate, the upper edge leveling ends on the two sides of the bottom plate are the open ends of the hollow structure of the die reinforcing boss, and the die reinforcing boss is arranged on the middle of the die reinforcing table. Further, the whole bottom that is of mould apron is the cuboid structure, and the top is the triangle structure, and the triangle of top its appearance and size and the bottom plate shape and the size phase-match of die body, and mould apron top both ends are equipped with the mould locating pin, and the mould apron passes through the bottom plate fixed connection of mould locating pin and die body. The hydraulic forming method of the M-shaped aircraft longitudinal section part using the forming die is suitable for the M-shaped aircraft longitudinal section part which has a structure with two sides bent edges, a larger gradient, a hooked edge, a longer longitudinal dimension and an M-shaped cross section, and comprises the following steps: Firstly, adding a process lug at each part notch according to the improvement requirements of a three-dimen