The light guiding unit on the surface is composed of sub - micron gratings whose transmission wavelengths are red , green and blue in order . the light source are red 、 green 、 blue led or semiconductor laser array . to enhance the light utilization , the surfaces of light guide plate except the incident and transmitted surfaces are coated with metallic film 本文设计的亚微米光栅型导光板为矩形状的,导光板上表面的导光单元是由三套出射光主波长分别是红光632 . 8nm ,绿光521nm ,蓝光441 . 6nm的亚微米光栅组成,光源采用的是红、绿、蓝三色发光二级管或者半导体激光器阵列,为了提高光能利用率,除入光面和出光面外,导光板其余面都镀上金属膜。
Due to the existence of the eddy and the abrupt bend of the stream line , the pressure on the four faces has the distribution as follow : the lowest pressure appears at several centimeters after the angle point along the top boundary , the highest pressure appears near the center line of the vertical shaft on the bottom boundary , near the angle point , the pressure on the inner boundary decreases with the decreasing height , the pressure on the external boundary decreases slightly in the right - angle region , and increases obviously near the corner 回流漩涡的存在，以及直弯处流线的急剧弯曲，导致壁面压力分布在上表面距弯点一定距离后出现压力最小值，下表面上，在竖井中心线略偏下游的位置出现压力最大值，竖井内表面接近弯点处出现压力沿程降低的现象，竖井外表面压力在进入直弯后先是沿程略有降低，在直弯角落处又明显升高。
The paper put forward a new method of machining different top and bottom shaped workpieces based on difference interpolation theory , the method calculated the displacement of prp and psp plane to equivalent accumulated displacements of uv and xy plane , which was of advantages for simplifying programming , reducing accumulative errors caused by traditional calculation method and increasing machining precision 摘要提出了基于差分插补理论的加工上下异型面工件的新方法，把工件的下表面（参考平面， prp ）和工件的上表面（第二平面， psp ）上的插补运动位移换算为uv及xy两平面上的位移叠加，具有简化编程、减小传统计算方法产生的累积误差、提高加工精度的明显优点。
Molded grating is composed of fiberglass roving combined with a thermosetting resin series designed for different environments and applications smg series standard grating has a concave profile on the upper surface for skid resistance , grit tops are available upon request 采用玻璃钢模塑成型工艺，在大型金属模具上制作，制品带有许多对称的方形或矩形网格的板材，称为玻璃钢模塑格栅， smg为标准英制模塑格栅系列，按客户要求上表面带月牙凹型或石英砂防滑，也可以做成表面封闭。
Firstly , the comparation study between the wedge pressing and the contour forging has shown that the transverse deforming initiated from the surface of the preforms . when the superficies reached the moulding wall , the deforming moved downwards as the high - direction deforming increased , till the moulding chamber was full of stock ; the transverse deforming of the moulding pressing stock initiated from the center of the stock then surned into a drum - type . the distribution of the density and hardness of the high - direction indicated that the wedge pressing acquired a better ability of pressing penetration 首先对比研究了楔形压制工艺与模压致密化工艺,发现楔压坯料的横向变形从上表层开始,当上表面与模壁接触后,随着高向变形量的增加逐步向下移动,直至坯料充满模腔;模压坯料的横向变形从坯料中间开始,形成鼓形。高向的密度、硬度分布表明楔压比模压具有更好的压透能力。
