梯形螺纹

Three kinds of flight cross sections were researched including rectangular cross section, hackle cross section and trapezoid cross section.

本文讨论的螺纹断面形状为三种：矩形断面、锯齿形断面，梯形断面。

The article introduces some needed resolving problems. It brings forward principium of control, How can drive the servo signal and X and Z to the coordination of movements; How to change the feed rate; design of system structure, confirmation for input and output point, I / O address allocation;and also the project for speedup/down control during the screwthread processing. Method of programming design and manual operation trapeziform figure in system of numerical control lathe Corresponding project to problems is provided synchronously.

介绍可编程控制器应用于车床数控系统需要解决的问题，如何产生驱动伺服机构的信号及X、Z向的动作的协调；如何改变进给速度等；提出PLC作为数控机床主控制器的控制原理；系统结构设计；输入/输出点数确定及输入/输出点的地址分配；螺纹加工中升、降速的解决方案；程序设计及具体操作梯形图设计的方法，并给出相应的解决方案。

The finite element models for contact problems of connectors of buttress and round thread s of casing are established with the elasto-plastic FEM.

用弹塑性有限元法建立了套管偏梯形和圆形螺纹接头接触问题的有限元力学模型。

The main products for the machine tap, tap of the screw, nut Taps, Taps spiral groove, Lo pointed ladder Tap Tap, tap hand, squeezing Tap, tap sets Lo, L-tap, straight trough Tap, tap and the roller teeth Tap kind of increase, lengthening Taps, and to undertake Gezhongfeibiao thread and special-shaped tool.

主要产品为各机用丝锥、管螺纹丝锥、螺母丝锥、螺旋槽丝锥、螺尖丝锥梯形丝锥、手用丝锥、挤压丝锥、螺套丝锥、左旋丝锥、直槽丝锥、滚牙丝锥以及各种加大丝锥、加长丝锥，并承接各种非标及异型螺纹工具。

The machining technique is recommended about machining the steep-lead multiple trapeziform left-hand internal screw thread in large diameter part using numerical control reformed CQ5250 vertical lathe.

介绍了采用数控化改造的CQ5250立车设备，加工大直径零件上的大导程多头梯形左旋内螺纹的加工方法。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。