摘要
國內(nèi)外制造業(yè)的發(fā)展經(jīng)驗表明，發(fā)展制造業(yè)，數(shù)控機床是基礎(chǔ)。數(shù)控機床很好地解決了現(xiàn)代機械制造業(yè)結(jié)構(gòu)復(fù)雜、精密、批量小、多變零件的加工問題，且能穩(wěn)定產(chǎn)品的加工質(zhì)量，大幅提高生產(chǎn)效率。然而企業(yè)若花大量的資金更換全新的數(shù)控機床，則花費過高，給企業(yè)造成的經(jīng)濟負擔(dān)過大，同時報廢大量的普通機床也是一個極大的浪費。因此對機床進行數(shù)控化改造不失為一個良策。本設(shè)計是針對常見的CA6140車床進行數(shù)控化改造以達到經(jīng)濟型數(shù)控機床的要求。主傳動系統(tǒng)部分保留原機床的主軸手動變速；進給傳動系統(tǒng)的縱向與橫向改造都是采用步進電機通過一級齒輪減速后驅(qū)動滾珠絲杠；原刀架拆除加裝自動轉(zhuǎn)位刀架（四工位）實現(xiàn)自動換刀；加裝脈沖發(fā)生器以實現(xiàn)切削螺紋功能；數(shù)控系統(tǒng)選擇MCS-51系列單片機組成的控制系統(tǒng)。
關(guān)鍵詞：CA6140車床；數(shù)控化改造；滾珠絲杠；步進電動機

Lathe transformation of the economic design of NC
Abstract
The manufacturing industry experience both at home and abroad shows that the development of manufacturing industry of foundation is numerical control machine tools .CNC machine tool solves the problems of modern machinery manufacturing complex structure,recision and small batch and changeable parts processing. and CNC machine tool can stabilize the quality of their products and greatly improve the production efficiency.However,it is cost that companies spend a lot of money to get new CNC machine tools.it is the economic burden for enterprises and the machine is a common scrapped a great waste.Therefore, transformation of the NC machine tools would be a good policy.This design is for the common reform CA6140 lathe for CNC machine tools to meet the requirements of NC machine.main transmission system retain the original manual transmission.the transmission system reform are based on the stepper motor through gears drive the ball screw.the cutter dismantle cutter with four automatic transfers to change location automatically.installation of the pulse generator to achieve the function of cutting thread.MCS - 51 single-chip control system is selected for Nc system.
Key words: CA6140 lathe; NC transformation; ball screws; Stepping Motor

目錄
1 前言 1
1.1 經(jīng)濟型數(shù)控改造的實際意義 1
2 經(jīng)濟型數(shù)控改造總體方案的確定 3
2.1 設(shè)計任務(wù) 3
2.2 總體方案的論證與確定 3
2.2.1 數(shù)控系統(tǒng)的選擇 3
2.2.2機械部分的數(shù)控化設(shè)計改造與選擇 4
3 主傳動系統(tǒng)的設(shè)計改造 6
4 主軸編碼器 7
5 機床滑動導(dǎo)軌的改造 8
6 進給傳動系統(tǒng)的數(shù)控化改造設(shè)計 9
6.1 縱向進給傳動系統(tǒng)的數(shù)控化改造設(shè)計 10
6.1.1切削力的確定 10
6.1.2滾珠絲杠螺母副的設(shè)計計算與選型 10
6.1.3 齒輪減速器的設(shè)計 17
6.1.4 步進電動機的計算與選擇 18
6.2 橫向進給系統(tǒng)的數(shù)控改造設(shè)計 21
6.2.1切削力的確定 21
6.2.2滾珠絲杠副的設(shè)計計算和選型 22
6.2.3齒輪減速器的設(shè)計 28
6.2.4步進電動機的計算與選擇 29
7 刀架的數(shù)控化改造 33
8 結(jié)論 34
參考文獻 35
致謝 37