Automatic needle pressing device and method for composite preform weaving process

Abstract

The invention relates to an automatic needle pressing device and method for a composite preform in a composite manufacturing process, and belongs to the crossing field of composites, mechanical manufacturing and computer technologies. The automatic needle pressing method disclosed by the invention comprises the following steps: using an industrial camera for collecting an image after the weaving needles are out of the array; enhancing the contrast between the weaving needle and the array by adopting a local adaptive image enhancement method; performing binarization processing; filling holes inthe weaving needle by methods of expansion, filling and the like; and refining the shape of the weaving needle by adopting a corrosion algorithm, deleting a pseudo weaving needle area with the area smaller than a set value, positioning the position area of the weaving needle, searching to obtain the position coordinate of the highest point, comparing the position coordinate with a calibration line, calculating the ascending height of the needle pressing mechanism, and ascending the needle pressing mechanism to press the uneven weaving needle into the same plane. The automatic needle pressingmethod is high in automation degree and detection precision, can press the weaving needles into the same horizontal plane, and guarantees automatic weaving of the composite preform.

Description

technical field [0001] The invention relates to an automatic needle pressing device and method in the weaving process of a composite material prefabricated body, and belongs to the cross technical field of composite materials, mechanical manufacturing and computer technology. Background technique [0002] Advanced composite materials represented by continuous fiber reinforced composite materials have much higher specific stiffness and specific strength than steel materials. In addition, they also have the advantages of corrosion resistance, fatigue resistance and strong designability. They are widely used in launch vehicles, Satellite, wind power, rail transit and other industrial fields. For a long time, two-dimensional structural composite materials have been one of the most widely used structures in composite material structures due to their simple fabrication, mature forming technology and equipment. [0003] Three-dimensional structural composite materials introduce re...

AI Technical Summary

Problems solved by technology

The existing three-dimensional structure composite material preparation process is relatively cumbersome, the manufacturing cycle is long, and there are many manual interventions, resulting in unstable formability of the composite material; in addition, in the manufacturing process, the equipment automation level is low, and the process parameter detection and control methods immature

[0004] In recent years, researchers have studied the weaving process and equipment of carbon fiber preforms, but there are problems such as excessive human intervention and low weaving efficiency in the weaving process.

And after the knitting needles are out of the array, the unevenness of the knitting needles will occur, which will affect the subsequent weaving process

The traditional method is to manually press the weaving needles to the same plane. The pressing process is inefficient and the position of the pressing needles is not accurate. At the same time, due to human error in the pressing process, the yarn is easily broken, which seriously affects the weaving efficiency.

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