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개요 및 적용분야
영국 WTI사는 수많은 인써트의 제작 경험을 토대로한 고도의 기술력을 지닌 혁신적인 회사입니다.
우수한 품질의 크롬 니켈 오스테나이트계 스테인레스스틸로 제작되며 온도 및 부식으로 부터 안전한 고성능 내부 쓰레드를 제공합니다.
또한 단순하면서도 독특한 디자인을 가진 인써트는 뛰어난 체결력을 보장합니다.
그동안 헬리칼 인써트는 손상된 쓰레드의 수리를 위해 설계되어 왔습니다.
단순한 어린이들의 장난감에서 부터 항공기 및 우주 탐사선에 이르는 다양한 어플리케이션에 성공적으로 사용되어 오고 있습니다.
기존설계에 도입 가능하면서도 저렴하고 컴팩트한 크기, 가벼운 무게의 헬리칼 인써트의 고유의 기계적 성능과 디자인으로 인해 1950년대 초 헬리칼 인써트의 도입 이후 지금까지 꾸준히 발전되어 오고 널리 사용되고 있습니다.

Strength

Due to their flexibility, wire thread inserts create internal threads which have a much improved distribution of residual stress loading when compared with conventional tapped holes, where up to 70% of the shearing forces are carried by the first three threads in the tapped hole. This extremely high loading, unfortunately, also applies to solid and thin walled inserts, due to their solid wall configuration. The flexibility of wire thread inserts helps to compensate for pitch and flank angle errors, inherent in normal tapped holes, and significantly enhances the load bearing capacity by deflecting the residual forces into a
helical hoop stress which is dispersed into the wall of the tapped hole. This enables the design to be confidently based on the bolt strength utilising smaller and shorter threads even when used in low strength materials.


Corrosion Resistance

WTI inserts are manufactured in 18/8 austenitic chromium/nickel stainless steel and offer excellent corrosion resistance, preventing adverse seizing and galling even at elevated temperatures. For applications involving severe corrosive conditions or subject to the effects of galvanic corrosion, additional surface coatings are available, such as cadmium, zinc, aluminium, silver or molybdenum disulphide.


Temperature Range

Standard inserts, manufactured in 18/8 stainless steel are suitable for operation within temperatures ranging from -160ºC to +420ºC (-320ºF to + 800ºF).

For applications involving extreme and elevated temperatures wire thread inserts can be manufactured in creep resistant nickel based alloys.


Cost & Weight Benefits

Wire thread inserts are much lighter and less expensive than any other equivalent thread insert. As a result of their compact size they can generally be incorporated into existing designs where no previous provision has been made. In many instances, because of their mechanical strength benefits their introduction may result in the use of thinner sections or lighter parent materials without sacrificing thread strength.


Wear Resistance

Due to a combination of material hardness and brilliant surface finish wire thread inserts create internal threads in which wear due to thread friction is virtually eliminated. This is of particular value in applications requiring repeated assembly & disassembly. The low frictional coefficient ensures that virtually all of the applied assembly torque is converted into clamping load. Thus providing threads that stay tight.