【正文】 I 摘 要 發(fā)動機作為汽車的心臟，其制造質(zhì)量直接影響著汽車的使用性能。缸體作發(fā)動機各機構(gòu)及各系統(tǒng)的裝配基礎(chǔ)零件，其制造精度對發(fā)動機的整體性能有著重要的影響。要提高發(fā)動機的使用性能，就必須控制發(fā)動機制造過程中關(guān)鍵零件的加工精度與加工質(zhì)量。 隨著我國經(jīng)濟的發(fā)展，國內(nèi)對汽車的需求迅速增長，如何提高汽車產(chǎn)品零部件的生產(chǎn)效率和加工質(zhì)量，對汽車行業(yè)的發(fā)展至關(guān)重要。發(fā)動機缸體是汽車五大部件之一，其生產(chǎn)效率和加工質(zhì)量直接關(guān)系到汽車的生產(chǎn)效率和性能。發(fā)動機缸體傳統(tǒng)的提高生產(chǎn)效率和加工質(zhì)量的途徑是盡量縮短輔助時間和采用剛性生產(chǎn)線 ，這種途徑在今天已經(jīng)越來越不適應(yīng)生產(chǎn)的發(fā)展。因此，在汽車行業(yè)中，如何提高發(fā)動機缸體生產(chǎn)效率和加工質(zhì)量是一項重要的研究課題。 本論文主要針對發(fā)動機下缸體及加工工藝 OP10 進行了研究，對本工序設(shè)計工藝方案進行了分析， 發(fā)動機缸體屬于箱體類零件，結(jié)構(gòu)復(fù)雜，加工易變形，因此加工精度要求高， 以缸體缸孔壁、曲軸孔等毛坯基準點為定位基準，對缸體進行精確定位。 由于缸體各個結(jié)合面面積較大，且有較高的位置精度和粗糙度的要求；缸體的加工部位多、加工要求較高、工藝路線長、工件輸送較難處理、使生產(chǎn)管理上較繁雜，對缸體進行加工 時采用臥式加工中心進行加工，采用臥式數(shù)控加工中心不僅能夠改善加工質(zhì)量而且能夠極大提高加工效率。論文主要對 OP10工序加工中心加工時刀具進行了合理選擇，夾具進行了設(shè)計并對夾緊力進行了計算。 關(guān)鍵詞 發(fā)動機缸體；定位基準；加工精度；加工中心 Abstract II Abstract The quality of the engine’s manufacturing influenced the performance of the car, as the engine is the heart of the motor vehicles. The accuracy of the manufacturing of the engine block has an important relationship with the overall performance, because the engine block is the fundamental part in the system of the engine. We have to control the machining accuracy and machining quality. With the development of our economy and rapidly growing demand for cars in China, how to improve the production efficiency and processing quality of auto parts, is crucial to the development of automobile industry. Engine cylinder block is one of the five major parts, and its production efficiency and processing quality are directly related to production efficiency and performance of the car. The traditional method to improve production efficiency and processing quality is trying to shorten the auxiliary time and adopt the way of a rigid line, which is already out of date in the current production. Therefore, how to improve the efficiency of engine cylinder block production and processing quality is an important research, and the WD615 engine used in heavy vehicles, including all kinds of engineering machinery, buses, power generation equipment, ships and other ideal power of engine, its cylinder processing design has greater significance. In this paper, we focus on the first step of the process and made research on the process. The engine block belongs to the block pieces, which is plicated in structure and easy to be deformed. We could adopt crankshaft bore as the positioning datum to ensure the accuracy. As the junction surface has a big area and a high demand of the accuracy and roughness, including high amount of the machining parts and high demand of the machining and the long routine of the processing, we have to adopt Horizontal machining center to improve the machining quality and efficiency. The task of the paper is mainly about the reasonable choice on the machining tools and calculation on the fixtures. Keyword: Engine cylinder Positioning reference Machining accuracy Machining center 目錄 目 錄 摘 要 ................................................................................................................................ I Abstract ............................................................................................................................II 第一章 緒論 .................................................................................................................... 1 汽車發(fā)動機加工工藝概述 .................................................................................. 2 發(fā)動機缸體加工工藝流程 ......................................................................... 2 缸體加工特點 .......................................................................................... 2 汽車發(fā)動機缸體國內(nèi)外發(fā)展現(xiàn)狀 ........................................................................ 3 柔性加工的特 點 ....................................................................................... 3 高速柔性加工的優(yōu)點 ................................................................................ 4 高速柔性加工存在的一些缺點 .................................................................. 4 本次設(shè)計的主要內(nèi)容 ......................................................................................... 5 定位基準選擇 ............................................................................................ 5 夾具的設(shè)計方案選取 ................................................................................ 5 刀具的選取 .............................................................................................. 5 設(shè)備選取 ................................................................................................. 6 設(shè)備工藝布置設(shè)計 ................................................................................... 6 本次設(shè)計的目的及要求 ...................................................................................... 6 本次設(shè)計的目的 ....................................................................................... 6 本次設(shè)計的要求 ....................................................................................... 6 第二章 加工設(shè)備的選取 ................................................................................................. 8 加工中心的基本概念和分類 ................................................................................ 8 加工中心的基本概念 ................................................................................. 8 加工中心的分類 ....................................................................................... 8 加工中心的結(jié)構(gòu)和工作原理 ................................................................................ 8 加工中心的結(jié)構(gòu) ........................................................................................ 8 加工中心的工作原理 ................................................................................. 9 加工中心工藝特點分析 ..................................................................................... 10 加工中心的合理選擇 ......................................................................................... 10 第三章 刀具的選取 ............................................................................