【正文】 (3) deep hole processing of the traditional processing method is used to grade twist drill feed, low efficiency of their production, processing and quality is poor. The deep hole in the engine block processing, the use of gun drilling process。
(4) The special machine TXK1500 this machine vertical machining center by the modification of shape, with vertical machining center features and performance, this machine has high strength, high wearresistant, high stability, high accuracy, highprofile etc.。s role is supporting and ensuring the piston, connecting rod, crankshaft and other moving parts work, the exact location。在發(fā)動機缸體的質(zhì)量檢測中，根據(jù)實際情況采用線外檢測，主要采用三坐標(biāo)測量機對缸體進行綜合測量，每200件抽查15件，每班抽查一件。在發(fā)動機缸體的機械加工中，同樣應(yīng)遵循這一原則。 毛坯的選擇發(fā)動機缸體采用的材料一般是灰鑄鐵HT150、HT200、HT250，也有采用鑄鋁或鋼板的，此發(fā)動機缸體采用高強度合金鑄鐵。缸體的工藝特點是:結(jié)構(gòu)、形狀復(fù)雜；加工的平面、孔多；壁厚不均，剛度低；加工精度要求高，屬于典型的箱體類加工零件。發(fā)動機缸體機械加工工藝設(shè)計應(yīng)遵循以下基本原則:(1) 加工設(shè)備選型原則 加工設(shè)備選型采用剛?cè)峤Y(jié)合的原則，加工設(shè)各以臥式加工中心為主，少量工序采用立式加工中心，關(guān)鍵工序一曲軸孔、缸孔、平衡軸孔加工采用高精度高速臥式加工中心，非關(guān)鍵工藝一上下前后四個平面的粗銑采用高效并有一定調(diào)整范圍的專用機床加工；(2) 集中工序原則 關(guān)鍵工序一機體缸孔、曲軸孔、平衡軸孔的精加工及缸蓋結(jié)合面的精銑，采用集中在一道工序一次裝夾完成全部加工內(nèi)容的方案，以確保產(chǎn)品精度滿足缸體關(guān)鍵品質(zhì)的工藝能力和有關(guān)技術(shù)要求；(3) 全部夾具均采用液壓夾具，夾緊元件、液壓泵及液壓控制元件采用德國或美國產(chǎn)優(yōu)質(zhì)可靠元器件；(4) 整線全部采用濕式加工，采用單機獨立排屑，高精度關(guān)鍵加工工序的臥式加工中心采用恒溫冷卻并加裝高精度高壓雙回路帶旁通精過濾系統(tǒng)，加工中心全部帶有高壓內(nèi)冷。對于發(fā)動機缸體生產(chǎn)線，可在零件上線前粗銑六個面，去除大部分余量，便于零件直接上線。 缸體的主要加工表面和輔助工序缸體主要加工表面和輔助工序有:(1) 平面加工 目前，銑削是發(fā)動機缸體平面加工的主要手段，國內(nèi)銑削進給量一般為300400mm/min，與國外銑削進給量20004000mm/min相比，相差甚遠(yuǎn)，有待于提高，因此，提高銑削進給量，縮短輔助時間，是提高生產(chǎn)效率的主要途徑，發(fā)動機缸體精加工一些平面時的銑削進給量達(dá)到2399 mm /min，大大提高了效率；頂面的銑削是缸體加工中的一個關(guān)鍵工序。一般地說，銑削用量的選擇原則是:端面銑刀銑削時首先應(yīng)盡可能取較大的銑削深度和銑削寬度，然后盡可能選取較大的銑削速度。 processing plane, more than holes。(2) refined the base of this box for the engine block parts, the general use of “side two sales” for a full range of uniform benchmarks. For the longer automated production line system, due to pin holes in the course of the wear and tear caused by inaccurate positioning, therefore, will be divided into 23 segment pin holes used. In the cylinder pin hole of the process, we have adopted to the side, bottom and the spindle hole positioning, in the processing center on the process. Machining Processing Stages and processes of the arrangements
Often a part of many apparent need for processing, of course, the surface machining accuracy are different. Processing of high precision surface, often after repeated processing。(7) Detect points outside the line detection and line detection of two kinds. Quality inspection in the engine block, according to the actual situation with lines outside the detection, the main use of coordinate measuring machine integrated measurements of the cylinder, each 200 samples 15 pieces, each class random one.
cylinder processing the choice of cutting parameters
Engine block choice of cutting parameters including cutting speed, feed rate and feed rate option. As the processing equipment is used in high precision and rigidity of machine tools and highspeed machining centers in order to ensure the efficiency of cutting may be the appropriate choice of cutting a larger amount. The main processing engine block surface plane and bearing bore, cylinder bore holes such as the processing, while the plane and bearing bore, cylinder bore of the processing method is mainly milling and boring, so the discussion here, the choice of cutting parameters are mainly milling and Boring choice of cutting parameters.(1) milling the choice of the amount of usage the choice of milling milling effect is directly related to good or bad. Generally speaking, the choice of dosage milling principles: Face milling cutter should be as much as possible when you first take a larger milling depth and width of milling, and then select the larger milling rate of as much as possible. Milling in a specific amount of choice when many factors involved, but in general, rough milling large margin when the workpiece, processing requirements low, the main consideration of the durability of cutter。(5) should make proper arrangements for secondary processes such as product inspection process, in part roughing stage, the key process before and after processing, spare parts all the processing has been pleted, should be appropriate arrangements.
Stage of processing division, has the following advantages: First, it can take measures to eliminate the rough workpiece after the stress, to ensure accuracy。
(4) The whole line used in all wet processing, using standalone BTA, highprecision machining processes critical horizontal machining center with constant cooling and to install highprecision highvoltage doublecircuit bandpass fine filtration system, all with highpressure processing center in the cold.
According to the technological characteristics of automobile engine cyli