【正文】
the fork processing speed, design, calculation and design of drilling jig. Fork the surface of the choice of processing methods, processing sequence of the arrangement, process centralization and decentralization of treatment, the division stage of processing, machine tools and process equipment selection, allowance and processes determine the size and tolerance of the preparation process are the main point of order problem. Fixture Design and facing the program is designed to identify, locate ponent selection, positioning errors of analysis and calculation, the calculation of clamping force, the specific folder structure and the rough with the determination of fixture elements. There are fork blank map, fixture assembly parts diagram and mapping how to ensure the technical conditions fork is the most important process, and fixture also plays a vital role. Fork reasonable structural design, design process to ensure quality processing fork, to improve the productivity of great significance, it is to ensure that the key to product quality. Fork through the design process can be found in a product design process requires a good coordination to succeed. Keywords: fork。撥叉表面加工方法的選擇、加工順序的安排、工序集中與分散的處理、加工階段的劃分、機(jī)床和工藝裝備的選擇、加工余量與工序尺寸及公差的確定等都是編制工藝規(guī)程的主要問(wèn)題。 clamping。撥叉應(yīng)用在變速箱的換檔機(jī)構(gòu)中,撥叉頭孔套早變速叉軸上。并在軸方向上均高于相鄰表面,這樣既減少了加工表面又提高了換檔是叉腳端面的接觸剛度。為實(shí)現(xiàn)換檔變速的功能,其叉軸空與變速叉軸有配合要求,因此加工精度要求較高。φmm孔的的端面為平面,可以防止鉆頭偏鉆,可以保證加工精度;另外,該零件除了主要工作表面外,其余的表面加工精度均較低,不需要高精度機(jī)床加工,通過(guò)銑床鉆床的粗加工就可以達(dá)到加工要求。否則,加工工藝過(guò)程中回問(wèn)題百出,更有甚者,還會(huì)造成零件的大批報(bào)廢,是生產(chǎn)無(wú)法正常進(jìn)行。因?yàn)樵摀懿嬖谳S向方向上的尺寸多以該端面作為設(shè)計(jì)基準(zhǔn)。撥叉軸孔φ12mm的外圓和右端面作為粗基準(zhǔn)。:銑——粗磨——精磨查《課程設(shè)計(jì)》表235可知,粗銑余量為3mm,查《課程設(shè)計(jì)》表236可知,,;查《課程設(shè)計(jì)》表120可知,粗銑的精度為IT12,粗磨為IT10,精磨為IT9;;查《課程設(shè)計(jì)》表240可得各公差為:T銑=,T粗磨=,T精磨=。由公式n=1000v/d可得該工序銑刀轉(zhuǎn)速,n=1000**80mm=,參照《課程設(shè)計(jì)》表415所列X51型立式銑床的主軸轉(zhuǎn)速,取n=160,在將該轉(zhuǎn)速代入該公式可求出該工序的實(shí)際銑削速度v=。3)切削速度的計(jì)算 參照《課程設(shè)計(jì)》表531,切削速度v可取為22m/min。3)切削速度的確定 參照《課程設(shè)計(jì)》表534,選取該工步的拉刀的速度為5m/min。3)切削速度的確定參照《課程設(shè)計(jì)》表532,切削速度v可取為10m/min。2) 進(jìn)給量的確定 《課程設(shè)計(jì)》表57,按機(jī)床的功率510KW,工件—夾具系統(tǒng)剛度為中等條件選取。2) 進(jìn)給量的確定 《課程設(shè)計(jì)》表57,按機(jī)床的功率510KW,工件—夾具系統(tǒng)剛度為中等條件選取。工序十七 鉆通氣孔φ3mm1)背吃刀量的確定 =3mm。由公式n=1000v/。 3)切削速度的確定 參照《課程設(shè)計(jì)》表536,選取工件的運(yùn)動(dòng)速度為v=30m/min由公式n=1000v/。 3)切削速度的確定 參照《課程設(shè)計(jì)》表536,選取工件的運(yùn)動(dòng)速度為v=15m/min公式n=1000v/。再使用快速螺旋卡緊機(jī)構(gòu)進(jìn)行卡緊。為了提高生產(chǎn)力,使用快速螺旋卡緊機(jī)構(gòu)。東北重型機(jī)械學(xué)院,洛陽(yáng)工學(xué)院,第一汽車制造廠職工大學(xué)編。北京:機(jī)械工業(yè)出版社1990(7) 機(jī)床夾具圖冊(cè)。北京:機(jī)械工業(yè)出版社,1992(10) 機(jī)械零件設(shè)計(jì)手冊(cè) 互換性與技術(shù)測(cè)量教材和金屬切削原理與刀具教材