The purpose of the study is to elucidate fiber deformation behavior during the forging of a spur gear by using a carbon fiber reinforced thermoplastic billet. The billet was composed of PA6/UD chips with a fiber length of 30 mm and fiber volume fraction of 50%. A gear forging mold was developed to deform the billet into a gear shape without cutting the fibers. Three types of billets were prepared: a horizontal billet with fibers orientated in the X and the Y directions, a vertical billet with fibers orientated in the Z and the X directions, and a random billet with fibers randomly orientated in the X–Y plane. The fibers along the tooth profile were formed using the horizontal and vertical billets. The adjacent teeth were connected by the fibers. A maximum tooth bending strength was 500 MPa. The delamination occurred under the tooth valley. The orientation of fibers in the teeth using the random billet was also random. The fracture occurred in the middle of the tooth. The results indicated that the fiber orientation in the billet is strongly correlated to the fiber orientation in the gear teeth and the tooth strength. The fiber orientation in the billet proposed in the study can form a tooth with fibers along its profile and with high strength.

该研究的目的是通过使用碳纤维增强的热塑性坯料来阐明正齿轮锻造过程中的纤维变形行为。该坯料由纤维长度为30 mm，纤维体积分数为50％的PA6 / UD切片组成。开发了齿轮锻造模具，以使坯料变形为齿轮形状而不切割纤维。制备了三种类型的坯料：具有沿X和Y方向取向的纤维的水平坯料，具有沿Z和X方向取向的纤维的垂直坯料以及具有在X-Y平面中随机取向的纤维的无规坯料。沿着齿形的纤维是使用水平和垂直坯料形成的。相邻的牙齿通过纤维连接。最大牙齿弯曲强度为500MPa。分层发生在齿谷下方。使用随机坯料在牙齿中纤维的取向也是随机的。骨折发生在牙齿中间。结果表明，坯料中的纤维取向与齿轮齿中的纤维取向和齿强度密切相关。研究中提出的坯料中的纤维取向可以形成具有沿其轮廓的纤维并且具有高强度的牙齿。