Stretch Bending Forming Technology of Large Angle Reverse Pull Profile Frame
A stretch-bending, large-angle technology, used in forming tools, manufacturing tools, metal processing equipment, etc., can solve problems affecting the geometric accuracy of parts, forming defects, etc., to improve production efficiency, dimensional accuracy, and small springback. Effect
Active Publication Date: 2016-05-11
TIANJIN AEROSPACE CHANGZHENG ROCKET MFGCO +1
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Problems solved by technology
[0004] In addition, since the part will have a certain springback after stretch bending, the springback is an inevitable phenomenon after the profile is stretched and bent. When the springback exceeds the allowable tolerance, it becomes a forming defect and affects the geometric accuracy of the part.
Method used
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[0036] Specific embodiments of the invention will be described in detail below in conjunction with the accompanying drawings.
[0037] According to the characteristics of the cross-sectional structure of large-angle profile frame parts, the invention reasonably arranges the forming process, rationally designs the mold, and produces profile frame parts with qualified dimensions through process improvement and technological innovation to meet subsequent assembly requirements.
[0038] Such as Figure 4 Shown, the concrete embodiment of this technology is:
[0039] Step 1, blanking:
[0040] Use a sawing machine to cut wool with a length of 8750mm. The length of the wool can be selected according to the length of the final finished part, which is slightly longer than the length of the finished part;
[0041] Step 2, pre-stretch bending forming:
[0042] a) Finishing the mold surface: before stretch bending, wipe off the sundries on the mold surface with cotton yarn and check w...
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Abstract
The invention provides a stretch bending forming process for a large-angle counter-drawing sectional material frame. The stretch bending forming process comprises the following steps: blanking, carrying out pre-stretch-bending forming, quenching, carrying out supplemented stretch bending forming, finishing and cutting to finally obtain a part. A mould of the process is correspondingly improved, and the radian of the middle part of the mould is slightly smaller than that of two end parts. According to the process, a two-time stretch bending forming process is adopted and is combined with a design of mould with an enlarged end outline; the size precision is obviously improved after a part is molded and the technical requirements on drawings are met; after the part is stretched and bent, the resilience value is very small and the manual finishing amount is very small; and the labor intensity of workers is greatly alleviated and the production efficiency is improved.
Description
technical field [0001] The invention belongs to the field of metal processing, and in particular relates to a processing technology for bending a metal large-angle back-drawing profile frame. Background technique [0002] At present, the bending and forming of the profile frame mainly adopts the stretch bending forming process. The stretch bending is to add axial tension while the wool is bent, so as to change the stress distribution in the wool section and make it tend to be uniform, so as to reduce springback and improve the profile. Dimensional accuracy. The stretch bending forming process adopted is generally as follows: first, a certain pre-tension force is applied to both ends of the profile, so that the stress on the cross-section slightly exceeds the yield limit, and then the bending moment is applied through the movement of the clamp to make it bend and film, and finally a certain amount of force is applied. The supplementary amount. [0003] As a structural part ...
Claims
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IPC IPC(8): B21D7/16B21D7/00B21D37/10B21D35/00
Inventor 李倩张杰刚尹苹刘祥龙马凯孟凡成吴劲松倪贵金
Owner TIANJIN AEROSPACE CHANGZHENG ROCKET MFGCO