外文原文：The number of common lather controls reformation method and designAbstract ：The tool machine number controls currently the market of turn the reformation still has very big development space in the our country, now our country the tool machine number control to turn a rate not to arrive 3%.Use the product that the common tool machine process widespread existence quality bad, the species be little, the file time be low, cost Gao, provide a goods period long, thus in the nations, local lack a competition ability on the market, directly influence a product, market, performance of business enterprise, influence existence and development of business enterprise, so have to strongly raise the number of tool machine to control to turn a rate.This text with the number of lather control a reformation for example, introduced a tool machine number to control the method of reformation, include it structural of reformation design, the choice of function and accuracy and finally reform the assurance of project. Keywords：The number control; Reform; Lather1. The tool machine number control the meaning of reformation(1)Economical funds. The number of tool machines controling a reformation to together purchase new tool machine to compare generally can save 60% or so expenses and the large and special equipments is particularly obvious.Generally large tool machine reformation need to spend new tool machine purchase commodity of 1/3.Even carry on the structure of the original tool machine to thoroughly reform to get stripe to also need to cost to purchase new tool machine 60% expenseses, and can make use of existing foundation.(2)The function stabilizes credibility.Because of original each foundation of tool machine piece through long-term time limited efficacy almost will not produce to transform in response to the dint but influence accuracy.(3) Raise a production efficiency. Tool machine after count controling a reformation can immediately carry out a processed automation efficiency can compare traditional tool machine to raise 3-500%.To complicated spare parts the difficulty more high effect raise more many.And can need not or little pack with the work, not only economized expenses but also can shorten production to prepare a period. 2. The number of common lather control to turn a reformation designThe number of tool machine controls a reformation, mainly is the design which carries on a creation to the structure of the original tool machine, end make the tool machine attain more ideal appearance.The number controls lather is machine electricity the integral whole turn of typical model representative, its machine structure together common tool machine have many likeness of place.However, modern of numbers controling tool machine be then to in brief control a traditional tool machine equipment last number system, is not a foundation in traditional tool machine either and only play chess a department to take in to improve but become.(those are subjected to a funds etc. condition restriction, but refit traditional tool machine suggest number control be another matter of tool machine)The traditional tool machine exists some weaknesses and flap sex such as the rigid shortage, anti- bad, hot transform greatly, glide noodles of friction resistance big and spread the existence cleft of the of move the component etc., and is hard to be competent number control tool machine to process requests such as accuracy, surface quality, rate of production and service life etc.The number of modern controls a technique, especially process center, regardless is it accept a parts, lord to spread to move system and enter to spread to move system, knife to have system and lend support to function etc. parts structure, still whole layout, exterior shapes etc.s all have already veried greatly took place to change and have already become number control the special machine structure of tool machine.Therefore, we in the process of carrying on a number to control a reformation to the common tool machine, should while consider various circumstance make various function index signs of common tool machine possibly control tool machine with number to connect near. 3. Count to control the function of the lather and the choice of the accuracyIsing not all old tool machines can carry on a number to control a reformation and the reformation of tool machine mainly should have two conditions:The first, the tool machine foundation piece has to be enough rigid.The second, the expenses of reformation wants accommodation, economy good.Do a decision to the function index sign of tool machine before refitting lather.The lather which refits behind can process a work piece of biggest turn round diameter and the biggest length, main electric motor powers etc. generally and will not change.Process the flat surface degree, straight line degree, cylinder degree of work piece and rough degrees etc. basically still are decide in the tool ma