阅读说明：本技术 一种细长条类c形截面钣金件的成型方法及成型装置 (Forming method and forming device for slender strip type sheet metal part with C-shaped section ) 是由 王晓康 石章虎 何万飞 于 2019-09-17 设计创作，主要内容包括：本发明属于航空零件加工领域,具体涉及一种细长条类零件的加工方法：其特征在于成型方法包括如下步骤：A.预先成形零件U形过渡形状；B.使用时将零件展开坯料用零件定位销定位到模体上,并用模具定位销对盖板和模体进行定位；C.安装完成后用橡皮囊液压成形机将零件U形预成形形状柔性包压成形；D.采用手工成形模成形零件两闭角处弯边；E.完成零件最终形状成形,并实现顺利取件,一种细长条类C形截面钣金件的成型装置,其特征在于包括：模体和底座,所述模体包括：盖板、零件定位销、模具定位销和零件预成形形状,所述底座包括：蘑菇销、零件、第一芯块、第二芯块和第三芯块。(The invention belongs to the field of aviation part processing, and particularly relates to a processing method of slender parts, which comprises the following steps: the method is characterized by comprising the following steps: A. pre-forming a U-shaped transition shape of a part; B. when the part unfolding blank is used, the part unfolding blank is positioned on the die body by using the part positioning pin, and the cover plate and the die body are positioned by using the die positioning pin; C. after the installation is finished, a rubber bag hydroforming machine is used for flexibly wrapping and pressing the U-shaped preformed shape of the part; D. forming the bent edges at two closed corners of the part by adopting a manual forming die; E. accomplish the shaping of part final shape to the realization gets the piece smoothly, a forming device of slender strip class C shape cross-section sheet metal component, its characterized in that includes: die body and base, the die body includes: apron, part locating pin, mould locating pin and the preformed shape of part, the base includes: mushroom pin, part, first core block, second core block and third core block.)

1. A forming method of a slender strip type sheet metal part with a C-shaped section is characterized by comprising the following steps:

A. pre-forming a U-shaped transition shape of a part;

B. when the part unfolding blank is used, the part unfolding blank is positioned on the die body by using the part positioning pin, and the cover plate and the die body are positioned by using the die positioning pin;

C. after the installation is finished, a rubber bag hydroforming machine is used for flexibly wrapping and pressing the U-shaped preformed shape of the part;

D. forming the bent edges at two closed corners of the part by adopting a manual forming die;

E. and finishing the final shape forming of the part and realizing smooth part taking.

2. The method of forming an elongated strip-like sheet metal member with a C-section according to claim 1, wherein: the detailed steps of the step A are as follows: forming a transition shape in the middle of a part in a hydraulic forming die of a rubber bag, bending edges at closed angles at two ends of the cross section of the part to be vertical downwards, and designing a die body into a U shape according to the maximum width of the part, wherein the U-shaped expansion length of the part is consistent with the expansion length of the final shape of the part.

3. The method of forming an elongated strip-like sheet metal member with a C-section according to claim 1, wherein: the width range in the step A is 20-25 mm.

4. The utility model provides a forming device of slender strip class C shape cross-section sheet metal component which characterized in that includes: die body (1) and base (7), die body (1) includes: apron (2), part locating pin (3), mould locating pin (4) and part are preformed shape (5), base (7) include: the die comprises a mushroom pin (6), a part (8), a first core block (9), a second core block (10) and a third core block (11), wherein a part positioning pin (3) is arranged on a die body (1), a cover plate (2) is arranged above the die body (1) and connected with a die positioning pin (4), the base (7) is provided with the mushroom pin (6), the base (7) is provided with a groove, the first core block (9), the second core block (10) and the third core block (11) are arranged in the groove according to requirements, and the part (8) is arranged in gaps among the base (7), the first core block (9), the second core block (10) and the third core block (11).

5. The forming device of an elongated strip-like sheet metal part with a C-shaped cross section as claimed in claim 4, wherein: the height of the highest position of the groove does not exceed the circle center of the bending edge of the part (8).

6. The forming device of an elongated strip-like sheet metal part with a C-shaped cross section as claimed in claim 4, wherein: the width of the second core block (10) is not less than 5.5 mm.

Technical Field

The invention belongs to the field of aviation part machining, and particularly relates to a machining method of slender parts.

Background

A complex C-shaped section sheet metal part is arranged in a civil aircraft boarding door, the width of the cross section is generally not more than 20mm, the height is generally not more than 6.5mm, a web is a hyperboloid, the length is generally more than 500mm, and the longest length can reach 3000 mm.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a forming method and a forming device for a slender sheet metal part with a C-shaped section.

A forming method of a slender strip type sheet metal part with a C-shaped section is characterized by comprising the following steps:

A. pre-forming a U-shaped transition shape of a part;

B. when the part unfolding blank is used, the part unfolding blank is positioned on the die body by using the part positioning pin, and the cover plate and the die body are positioned by using the die positioning pin;

C. after the installation is finished, a rubber bag hydroforming machine is used for flexibly wrapping and pressing the U-shaped preformed shape of the part;

D. forming the bent edges at two closed corners of the part by adopting a manual forming die;

E. and finishing the final shape forming of the part and realizing smooth part taking.

The detailed steps of the step A are as follows: forming a transition shape in the middle of a part in a hydraulic forming die of a rubber bag, bending edges at closed angles at two ends of the cross section of the part to be vertical downwards, and designing a die body into a U shape according to the maximum width of the part, wherein the U-shaped expansion length of the part is consistent with the expansion length of the final shape of the part.

The width range in the step A is 20-25 mm.

The utility model provides a forming device of slender strip class C shape cross-section sheet metal component which characterized in that includes: die body and base, the die body includes: apron, part locating pin, mould locating pin and the preformed shape of part, the base includes: the die comprises a die body, a mushroom pin, a part, a first core block, a second core block and a third core block, wherein a part positioning pin is arranged on the die body, a cover plate is arranged above the die body and connected with the die positioning pin, the base is provided with the mushroom pin, a groove is formed in the base, the first core block, the second core block and the third core block are arranged in the groove according to requirements, and the part is arranged in a gap between the base and the first core block, the second core block and the third core block.

The height of the highest position of the groove does not exceed the circle center of the bending edge of the part.

The width of the second core block is not less than 5.5 mm.

The working principle is as follows:

a shallow groove is designed on the base, the shape of the inner cavity of the groove is consistent with that of a U-shaped piece preformed in the first process, the groove is convenient to put in, and the circle center of the highest position of the groove is consistent with or slightly lower than that of the bent edge of the part, so that the preformed U-shaped piece is positioned without shielding a forming tool; meanwhile, in order to facilitate taking out the piece, the core block is designed into three blocks according to the cross section, the projection width of a single C-shaped bent edge is usually 5-5.5 mm, so that the width of the cross section of the middle block is larger than the value, and after the middle block is taken out, the blocks wrapped at the C-shaped bent edges at the two sides are horizontally and smoothly translated to the middle position and vertically taken out.

The length direction considers whether the segmentation is carried out if the segmentation is too long according to the length of the part or the die.

Because the core block is slender and easy to machine and deform, each piece is easy to deform when being machined respectively, and therefore, the block dividing surfaces of the core block are made to be perpendicular to the bottom surface of the die, so that the three pieces can be separated by a linear cutting method after being integrally machined, and the deformation is reduced as much as possible.

When the U-shaped piece is used, the U-shaped piece which is pre-formed in the first process is placed in the shallow groove of the base, the first core block, the second core block and the third core block are respectively placed in the inner cavity of the U-shaped piece, and the U-shaped piece and the second core block are positioned on the base through mushroom pins. And after positioning is finished, clamping each core block by using the arch-shaped clamp, and knocking the preformed U-shaped piece to the sticking die by using the hammer to finish the final forming of the part. When the part is unloaded, the second core block is taken out firstly, then the first core block and the third core block are respectively taken out, and finally the part is taken out.

The invention has the beneficial effects that:

1. the invention reasonably adopts the middle transition shape of the flexible hydraulic forming part, thereby not only improving the forming efficiency and quality of the part, but also reducing the manual workload of the following steps.

2. The forming step of the invention adopts manual forming closed angle bending, the mold core adopts a block structure, and the block surface is reasonably designed, thereby not only solving the processing deformation problem of the slender core block, but also solving the problem of taking out the formed piece.

Reference numerals

1. The method comprises the following steps of (1) forming a die body, 2. a cover plate, 3. a part positioning pin, 4. a die positioning pin and 5. a part preformed shape; 6. mushroom pin, 7, base, 8, part, 9, first core block, 10, second core block, 11, third core block.

Drawings

FIG. 1 is a schematic view of the shape of a part of the present invention;

FIG. 2 is a schematic view of a preformed U-shape of a part of the present invention;

FIG. 3 is a schematic view of the A-A structure of the mold body according to the present invention;

FIG. 4 is a schematic view of the B-B structure of the mold body according to the present invention;

FIG. 5 is a schematic illustration of a hydroformed U-shape, pre-shaped, of a bladder of the present invention;

FIG. 6 is a final forming of the hand formed closed angle bead of the present invention;

FIG. 7 is a schematic view of the structure B-B of the molding apparatus according to the present invention.

FIG. 8 is a schematic view of the A-A configuration of the molding apparatus of the present invention;

the specific implementation mode is as follows: