They are all alternate pitting except a few species.
结果表明 :该科植物在导管管腔的长度 ,管腔宽度上都有较大的差别 ;纹孔为具缘纹孔 ;纹孔的排列方式上 ,除少数种外均为互列式纹孔式 ;管间纹孔成群分布 ,且绝大部分呈现出规则的形状 ;在成群分布的纹孔内或边缘区域 ,有圆形点状突出物或由大小不同的孔做成的网状突出物 ,在该科中普遍存在。
Using the nonlinear function of finite element software-Marc,a FEM model for the contact between lining board and wheel was presented,which gives the relations of maximal stress to the size of threaded hole in the lining board.
利用有限元软件Marc的非线性功能,建立衬板与轮子接触的有限元模型,得到衬板上螺纹孔尺寸和最大应力的关系,提出了改善衬板受力的设计方案。
Introduced the structure process of the capping plate, analyzed four threaded holes process request, adopted the special clamp to machining the four threaded holes.
介绍了盖板零件的结构工艺,分析了零件上的4个螺纹孔的工艺要求,针对4个螺纹孔的加工,通过采用专用的夹具,简化了生产零件的模具结构,实现了零件产品的最终要求,保证了质量,同时也提高了效率、降低了成本。
Working technique of self-tapping thread hole on aluminum part;
铝件螺纹孔自攻加工工艺
Mainly introduced injection mold design method for the water tank with many thread holes and cut plastic blind hole, using the cylinder driving system, mold design idea was unique,the structure was novel and compact, gained good effect in production, it had important reference and guide function.
重点介绍了接水盘多个螺纹孔、减胶盲孔在模具设计中实现的方法,采用油缸驱动系统,模具构思独特,结构新颖、紧凑,并在生产中应用取得满意效果,对同类型模具结构设计有重要的借鉴与指导意义。
In this paper,a fixture is designed to turn the thread holes on backwater gland in CNC lathe.
设计的夹具是用于在数控车床上车削回水盖螺纹孔的专用夹具,属花盘式车床夹具,并且带有分度装置,主要由过渡盘(与车床主轴连接)、夹具体、定位元件(分度盘、圆柱销、菱形销)、夹紧元件(压板)、分度装置(分度对定装置和分度盘)等组成。
As a result,torus of the bordered pit on the fir tracheid can be seen clearly,and the change of the thickness from torus to margo is not obvious.
现在人们已清楚地知道针叶材具缘纹孔的纹孔膜由塞缘和纹孔塞组成,悬挂纹孔塞的塞缘由连接到纹孔缘基部的微纤丝束形成,这些微纤丝束随意结合形成网状构造,因此纹孔膜小孔的大小、形状极不规则。