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Skin stretching defect online detection device

A detection device and skinning technology, applied in transportation and packaging, manufacturing tools, aircraft parts, etc., can solve problems such as insufficient forming, uneven thickness of skin parts, material waste, etc.

Active Publication Date: 2019-11-29
SICHUAN UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of stretch forming, uneven distribution of stress will occur inside the aircraft skin, and a large friction force will be generated between the mold and the aircraft skin, resulting in uneven thickness of the formed skin parts and insufficient forming. The surface defects are obvious, which greatly reduces the forming quality of skin parts, and the skin parts with poor forming quality can only be discarded, resulting in waste of materials

Method used

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  • Skin stretching defect online detection device
  • Skin stretching defect online detection device
  • Skin stretching defect online detection device

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Embodiment Construction

[0051] In order to make the above objects, features and advantages of the present application more obvious and comprehensible, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0052] In related technologies, the stretching test of the aircraft skin is performed after the aircraft skin is processed. The inspector uses a detection device to scan the aircraft skin. If a defect is detected in the aircraft skin, the aircraft skin is discarded. However, the completion of aircraft skin processing requires multiple processes such as plate rolling→annealing→cleaning→solution treatment→stretch forming→aging→machining→surface treatment. After the aircraft skin processing is completed, the skin tensile test will Cause useless processing of aircraft skin, also can cause the waste of aircraft skin material.

[0053]The aircraft skin is an alloy material. During the stretching process, the c...

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Abstract

The invention discloses a skin stretching defect online detection device, relates to the field of sheet forming, and aims to detect and locate the defects of skin stretching of an aircraft in real time. The device comprises acoustic emission sensor arrays, stretching equipment and a signal processing system; the stretching equipment is provided with groove holes and used for stretching skin; the acoustic emission sensor arrays are arranged in the groove holes and are used for detecting elastic wave signals generated by the skin during the process of stretching the skin by the stretching equipment; the acoustic emission sensor arrays transmit the elastic wave signals to the signal processing system; and the signal processing system analyzes the elastic wave signals through VMD decomposition, and when parameter values of the elastic wave signals are larger than normal threshold values, an alarm signal is sent to remind a user that the skin has defects.

Description

technical field [0001] The present application relates to the field of sheet metal forming, in particular to an online detection device for stretching defects of skin. Background technique [0002] As China's main pillar industry, the development of manufacturing industry plays a vital role in promoting economic growth. As an important part of the manufacturing industry, sheet metal forming technology is widely used in aviation manufacturing, high-speed trains, ships and modern buildings. [0003] In aircraft manufacturing, skin parts are the main parts of the aircraft body, accounting for about 70% of the total number of aircraft parts. Aircraft skin parts have the characteristics of large size, small batch size and complex structure. The main forming method is stretch forming. However, in the process of stretch forming, uneven distribution of stress will occur inside the aircraft skin, and a large friction force will be generated between the mold and the aircraft skin, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/20B21D53/92B21C51/00
CPCB21C51/00B21D22/20B21D53/92
Inventor 伍剑波邱巧
Owner SICHUAN UNIV
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