2020/02/27

Effective CFRP Drilling Case with Hantop Intelligence Tech. Ultreasonic Machining Module

Effective CFRP Drilling case with Hantop Ultrasonic Machining Module|Hantop Intelligence Tech.

Last time, we focused on the advantages of ultrasonic processing cases in CFRP and the various applications of CFRP. Among them, we are also particularly concerned about the drilling of CFRP. During the carbon fiber composite material (CFRP) drilling process, due to the material characteristics, the drilling tool is generally worn more seriously, and the drilled part is prone to defects such as delamination, burrs, tearing and the like.
 
Here are three common shortcomings:
 
Delamination: During the drilling process, the carbon fiber material generates interlayer stress under the action of the drilling force. If sufficient support is not applied to the hole exit side, interlayer stress is prone to occur at the hole exit. If the stress exceeds the resin matrix, Strength, it is easy to separate the carbon fiber from the resin matrix, resulting in layering defects. In general, the larger the axial force during drilling and the greater the interlayer stress, the more likely it is that layering will occur.
 
Burr: Carbon fiber composite material has non-uniformity, and the direction of carbon fiber layering has a greater impact on hole making. The anisotropy of the material, the cutting of different angles of the carbon fiber by the cutter at different positions will cause some carbon fibers to be stretched. It is not the shear action, these are the factors that cause burrs at the exit and entrance of the hole. The carbon fiber composite material has relatively severe wear on the drilling tool, so when the tool is passivated, the carbon fiber cannot be cut smoothly, and burrs are also easy to be generated.
 
Entrance damage (Tearing): There are two stages in the drilling of carbon fiber composite materials. One is the cutting edge action stage. The cutting speed of the cutting edge is slow and not sharp, and the material cannot be cut. It is the main cutting action stage. The main cutting edge is pushed outwards and twisted on its own. These are prone to tearing.

(Source: http://www.tanxw.com/news/hydt/1735.html)
 
Hantop's Ultrasonic Machining Technology responds to these three defects and can achieve the following improvements: the ultrasonic knife handle superimposes the additional vibration in the ultrasonic machining, which reduces the cutting resistance by 40%, and slows down the wear of the tool due to resistance. The reduced wear of the tool can also delay the occurrence of burrs and greatly improve the quality of the machined surface. Dense and fine vibration also avoids direct impact tearing of the tool and the material itself, reducing fiber tearing and hole breakage under drilling; in addition, for drilling, cutting heat and cutting accumulation caused by cutting accumulation often affect the quality of the hole 2. Aggravate tool wear and increase processing material loss. In addition to each ultrasonic vibration can increase cutting removal and hard to accumulate cutting heat, the use of a non-contact power transmission system by Hantop Intelligence Technology reduces the thermal impact of cutting and maintains high speed, making the rotary motion of the tool smoother. .
 
Every week, Hantop Intelligence Technology will share different cases of composite materials processing. Welcome everyone to watch our website and fan special regularly to get the latest verification results of ultrasonic processing!
 
Visit our other cases: https://www.hit-tw.com/Advantage.aspx?ID=5
Next week will be the introduction of PEEK and the application of ultrasound to it. Welcome old and new friends who are interested to discuss it again.

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