谁能帮我用英语翻译一下下面这篇文章，要精确点的啊，不要那种在线翻译的哦

Question

数控转台
随着我国制造业的发展，加工中心的需求也在增加，特别是四轴、五轴联动的加工中心。作为数控机床的主要功能部件，数控转台在整个机床工具行业中的作用越来越重要。
数控转台的出现，为加工中心和数控铣床提供了回转坐标，通过第四轴、第五轴驱动转台或分度头完成精密角度的等分、不等分或连续的回转加工，完成复杂曲面加工，使机床的加工范围得以扩大。
1.数控转台的分类
数控转台按照不同分类方法大致有以下几大类：
（1）按照分度形式可分为等分转台和任意分度转台。
（2）按照驱动方式可分为液压转台和电动转台。
（3）按照安装方式可分为立卧转台和立式转台。
（4）按照回转轴轴数可分为单轴转台、可倾转台（两轴联动）和多轴并联转台。
2.数控转台的结构
数控转台从结构上可以分为几个部分：驱动、传动、分度定位、刹紧等机构。数控转台通过传动部分，将由系统控制的驱动传递到需转动角度的工作台台面，实现数控转台的分度转位。
（1）驱动 液压转台采用液压驱动齿条或液压马达，通过齿条驱动齿轮或液压马达驱动齿轮的方式进行动力提供；而电动转台则采用伺服电动机提供动力。
（2）传动 有齿条齿轮传动、蜗杆蜗轮传动几种方式。电动转台一般是通过一对齿轮（或者是用联轴器直接与蜗杆相连）将电动机动力传递到蜗杆，带动转台进行分度；液压转台，采用液压马达驱动的传动结构，类似于电动转台；采用齿轮齿条的，则是通过由活塞驱动的齿条带动与之啮合的与台面相对固定齿轮进行分度。
（3）分度定位 等分转台一般采用端齿盘分度定位，任意分度转台一般采用高精度蜗杆蜗轮分度定位。采用端齿盘分度定位的转台中，又有两联齿盘和三联齿盘之分。两联齿盘分度定位，结构相对简单，动、定两个齿盘直接啮合，分度运动时，动定齿盘首先进行脱开—啮合运动，这一运动表现在转台台面上有一定量的抬起动作，台面的抬起量与定齿盘和动齿盘的相对运动量相一致。三联齿盘分度定位，从结构上比两联齿盘复杂，动定齿盘不直接进行啮合，而是通过一公用齿盘进行啮合过渡，齿盘的啮合与脱开运动是通过公用齿盘的移动来完成的，公用齿盘的抬起不表现在转台的台面上。也就是说采用三联齿盘分度定位的转台，运行过程中台面不需抬起，但啮合刚性比两联齿盘结构稍差。
采用端齿盘分度定位的等分转台，其分度定位端齿盘包括向心齿、直齿、弧面齿等形式，为达到高精度的分度，端齿盘一般采用淬硬钢齿面磨削的工艺方法，产品可达到高刚性与高精度的要求。但其分度等分数受齿盘齿数的限制。
采用蜗杆蜗轮分度的转台，分度元件为蜗杆蜗轮副单头单导程蜗杆、单头双导程蜗杆、（蜗杆有圆柱蜗杆多头蜗杆 和直线环面以及平面包络蜗杆等形式）。一般蜗杆材料选用淬火钢，蜗轮材料一般采用耐磨铜合金。其分度等分数不受限制，分度定位精度直接决定于蜗杆蜗轮的加工精度。
（4）刹紧机构 等分转台的刹紧一般采用液压，给相互啮合的齿盘施加一定的压力，使端齿盘可靠啮合定位。任意分度的数控转台，较多采用胀紧套或刹紧片用液压或气压刹紧的方式，刹紧可靠性比较高。
3.数控转台的种类
将各种不同机构组合，便形成了现存的各种具体的数控回转工作台：液压等分转台、电动等分转台（分抬起和不抬起）、电动任意分度转台、立卧两用回转转台、立式回转转台、多轴并联，多轴并联可倾立卧两用转台、可倾回转转台等。

Answer 1

CNC turret
Along with the development of the manufacturing industry in China, the demand of machining center are also on the increase, especially 4-axis and 5-axis linkage of machining center. As the main function of CNC machine, CNC turret parts in the whole machine tool industry is becoming more and more important role.
Nc rotary table for machining center, nc milling machine and provides rotary coordinates, through the fourth, fifth drive shaft turntable or head complete precision Angle, not equal parts or continuous turning processing, complex surface finish machining, make the machine to expand.
1 the classification of nc rotary table
According to different classification method of nc rotary table roughly several categories:
(1) according to the degree form can be divided equally turntable and arbitrary indexing turntable.
(2) according to drive mode can be divided into hydraulic turntable and electric turret.
(3) according to the installation can be divided into vertical and horizontal and vertical turntable channel.
(4) according to the rotor shaft can be divided into several single axis turntable, can pour turntable (two) and multiaxial parallel linkage channel.
2 the structure of nc rotary table
From the structure of nc rotary table can be divided into several parts: driver, transmission, orientation, brake tight, etc. Nc rotary table transmission part through the system to control the drive to the rotation Angle, CNC turret workbench mesa of dividing inversion.
(1) drive hydraulic turntable adopts hydraulic drive rack or hydraulic motor driving gear, through the rack or hydraulic motor driving gear dynamic way, And electric turntable servo motor adopts power.
(2) transmission, worm gear transmission is rack worm gear in several ways. General electric turntable is through a gear (or is connected directly with coupling with the worm will power to worm, motor drive turntable for dividing, Hydraulic turntable, adopts hydraulic motor drive, the transmission structure similar to electric turret, Using super-modulus gear and is driven by the piston rack drive and the meshing with mesa relatively fixed gear indexing.
(3) sub-degree turntable is generally USES the positioning weapon.these gear disk indexing positioning, arbitrary precision indexing turntable worm gear generally adopted indexing positioning. Using the tooth disk indexing positioning, and two channel al tooth disk and press tooth disk. Two league gear indexing plate, structure, dynamic, relatively simple two tooth disk directly meshing, dividing, dynamic set off first gear disk drive, the meshing movement -- YunDongBiao now turntable is a certain amount of lift mesa, mesa and set up the gear disk with the relative exercise consistent. Sanlian tooth disk indexing positioning, from the structure than two league gear disk with complex, shall not directly gear disk, but through a public meshing gears plate mesh transition, the meshing and open movement is through the public mobile to complete the public performance in the turntable is not lift mesa. That adopts triple tooth disk indexing positioning of the turntable, operation process, but should not lift mesa of meshing rigidity than two couplet tooth structure.
Using the tooth disk indexing positioning, its indexing turntable is equal to the position including heart tooth gear disk, spur gear, gear indexing, to achieve high precision indexing, end tooth disk generally USES a hardened steel tooth grinding process, product can reach high rigidity and the precision requirement. But its indexing scores of gear tooth disk are limited.
Using the worm gear indexing of turntable, dividing element for the worm gear pair single head single lead cylindrical worm, double guide cylindrical worm and worm (cylindrical worm and worm have long straight torus, and plane enveloping the worm, etc.). General worm gear harden steel material selection, usually adopts the anti-wear copper alloy material. Its indexing scores unrestricted, dividing positioning accuracy in worm gear directly determine the machining accuracy.
(4) brake tight tight the turntable is equal institutions, general adopts hydraulic brake for mutual engagement of the tooth disk put some pressure, make the tooth disk reliable meshing positioning. Any degree of CNC turret, more USES lhe swelling or a brake hydraulic or pneumatic tightly with brake, brake tight tight high reliability.
Three kinds of nc rotary table
The various agencies, formed the existing CNC rotary worktable various concrete: hydraulic parts, electric parts turntable (points), and not lift up any degree of electric turret, vertical and horizontal, vertical dual rotary turntable, turning the multiaxial parallel axis parallel tilt, stand at turntable, can pour rotary turntable, etc. 百分之90多没有问题

Answer 2

NC rotary table
Along with the development of manufacturing and processing center is also increasing demand, especially in four-axis, five-axis machining center. As the main features of NC machine tools, CNC rotary table in the machine tool industry in the increasingly important role.
The emergence of the NC rotary table for machining centers and CNC milling machine to provide a rotating coordinate axes through the fourth, fifth axis drive turntable or complete precision dividing head angle decile, ranging from points or a continuous rotary process, the completion of complex surface machining so that machine processing is wide.
1. The classification of the NC rotary table
NC rotary table according to different classifications to the following categories:
(1) In accordance with the form can be divided into decile indexing turntable, and any sub-degree turntable.
(2) in accordance with the drive mode can be divided into hydraulic and electric turntable turntable.
(3) in accordance with the installation can be divided into vertical and horizontal and vertical turntable turntable.
(4) in accordance with the rotary axes can be divided into single-axis rotary table, tilting turntable (2 axis) and parallel multi-axis turntable.
2. The structure of the NC rotary table
NC rotary table from a structure can be divided into several parts: drive, transmission, sub-degree position, brake and other institutions close. NC rotary table through the transmission part of the drive system control will be passed to the rotation angle of the table tops, NC rotary table indexing translocation.
(1) Drive Turntable with hydraulic drive rack or hydraulic motor, drive through the rack gear or hydraulic motor driven gear provided the dynamic manner; and electric turntable is powered by servo motors.
(2) drive a rack gear, worm gear drive in several ways. General Electric turntable by a pair of gear (or worm is directly connected to the coupling) will be delivered to the worm motor power to drive turntable for indexing; hydraulic turntable, hydraulic motor driven transmission structure, similar to the electric turntable; use rack and pinion, then drive through the rack piston driven by the engagement with the table with a relatively fixed gear indexing.
(3) the general indexing turntable positioning decile Gear Plate by-side position, any sub-degree turntable generally use high-precision positioning Worm indexing. Gear Plate by-side positioning of the switch to Taichung, but also two joint disc and triple chainring teeth divided. 2 United Gear Plate positioning, structure is relatively simple, dynamic, given the direct engagement of two gear set, sub-degree movement, moving to disengage the first gear wheel set - engagement movement, the movement is now a certain amount of countertop turntable up action, the table of the lift capacity and fixed disc and moving gear tooth plate consistent with the relative amount of exercise. Triple Gear Plate position, structurally complex than the two associated tooth plate, moving and stationary gear tooth plate is not directly but through a common transition meshing gear wheel, gear engagement and disengagement plate movement is through the public dental plate movement to complete, the public does not show up tooth plate on the counter in the turntable. That is by Triple Gear Plate positioning turntable, without running up the process table, but the meshing gear wheel rigid structure than the two together little worse.
Gear Plate by-side positioning of the decile turntable, its sub-degree orientation to the heart, including the crown wheel teeth, straight teeth, teeth arc form, to achieve high-precision indexing, general use of the crown wheel of hardened steel teeth method of surface grinding process, the product can achieve high rigidity and high precision requirements. But the score by dividing the number of teeth tooth plate restrictions.
Worm used the turntable indexing, indexing component for the single-head worm worm worm single lead, single head and dual-lead worm, (a cylindrical worm worm worm and straight long torus and the plane enveloping worm in the form). Material selection generally hardened steel worm, worm commonly used wear-resistant copper alloy material. The sub-degree scores unrestricted, sub-degree positioning accuracy is directly related to worm and worm wheel machining accuracy.
(4) brake tight body tight attainment Turntable general hydraulic brake, to the mutual engagement of the gear plate to exert some pressure on the crown wheel gear and reliable positioning. Arbitrary degree in the NC rotary table, more use of expansion sleeve or tight piece brake hydraulic or pneumatic brake tight manner, brake bear relatively high reliability.
3. NC rotary table type
From different agencies together and give concrete form to the various existing CNC Rotary Table: Hydraulic decile turntable, electric decile turntable (points up and no lift), electric arbitrary indexing turntable, vertical-horizontal dual-use rotary turntable, vertical rotary turntable, axis parallel, multi-axis dual-use turntable parallel tilting the vertical and horizontal, tilting rotary turntable so.

Answer 3

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