Abstract:
The present invention relates to a method for preparing a corrugated preform using a braiding process and a corrugated preform prepared by the same, and more specifically, a method for equalizing the fiber volume percentage and the alignment angle between a concave portion and a convex portion at the time of preparing a corrugated preform based on a braiding process, that is, to a method for preparing a corrugated preform using a braiding process, in which a concave portion is braided in the same manner as a cylinder-shaped braid, and a convex portion is braided to have a division structure by installing a locking device or counter-rotating device at a braiding apparatus, thereby equalizing the fiber volume percentage and the alignment angle between the concave portion and the convex portion; and to a corrugated preform prepared by the same.
Abstract:
본 발명은 국부보강을 통해 스프링 상수 향상과 영구변형 감소를 도모할 수 있는 중공 주름형 복합재 스프링에 관한 것이다. 본 발명은 분할 구조의 주름형 복합재 스프링의 응력집중 부위를 국부보강하여 영구변형을 줄이고, 스프링 상수 향상 효과를 가질 수 있는 새로운 형태의 분할 구조의 주름형 복합재 스프링 구조를 구현함으로써, 선형적 스프링 특성을 유지하면서 스프링 상수를 향상시킬 수 있으며, 브레이딩과 필라멘트 와인딩 공법을 동시에 적용하는 우수한 생산성으로 연속공정화가 가능한 자동차 현가장치의 중공 주름형 복합재 스프링을 제공한다.
Abstract:
PURPOSE: A carbon fiber composite is provided to improve the properties of a flexural performance, to reduce the weight thereof, and to provide excellent bending and surface properties. CONSTITUTION: A carbon fiber composite comprises 30-80 weight% of a carbon fiber-woven fabric with a carbon fiber tow size of 24-100 K; 0.1-20 weight% of a carbon unwoven fabric; and a polymer resin of 10-70 weight%. The weight per unit area of the carbon nonwoven fabric is 10-500 g/m^2. The viscosity of the polymer resin at injection is 0.01-10 Pa·s. The crystal size of the carbon fiber measured by an X-ray diffraction is 1-6 nm, and the average diameter of a single fiber is 1-20 micron. [Reference numerals] (AA) Vacuum sealing; (BB,II) Vacuum port; (CC,HH) Resin inlet; (DD) Upper mold; (EE) Lower mold; (FF) Carbon fiber fabric; (GG) Carbon non-woven fabric
Abstract:
PURPOSE: A vehicle suspension spring is provided to reduce loads and vibration using a bellows-shaped spring made of composite materials. CONSTITUTION: A vehicle suspension spring (100) is supported in a lower seat (300) and a vehicle body (200) to provide elasticity and is shaped into hollow bellows. The spring comprises an inner layer and an outer layer. The inner and outer layers are made of different materials.