1、畢 業(yè) 設(shè) 計(jì)（論 文）說 明 書題 目 套筒十字槽銑削專機(jī)設(shè)計(jì) 學(xué) 生 學(xué) 院 機(jī)械工程學(xué)院 專 業(yè) 班 級 機(jī)械工程及其自動化（涉外機(jī)械）學(xué) 號 指 導(dǎo) 教 師 目 錄第一章 前言··································

2、3;·················31.1 銑床簡介·······························&

3、#183;················· 31.1.1 銑床的發(fā)展歷史·····························

4、3;············· 31.1.2 銑床的分類··································

5、83;············ 3第二章 銑床內(nèi)部結(jié)構(gòu)的各項(xiàng)性能校核······························· 42.1 確定電動機(jī)類型·&

6、#183;··········································· 42.2 外部傳動件的校核····

7、;········································42.2.1 帶傳動各項(xiàng)性能校核·······&

8、#183;·································· 52.2.2 齒輪傳動各項(xiàng)性能校核············&

9、#183;····························72.2.3 軸的各項(xiàng)性能校核計(jì)算··················&#

10、183;······················9第三章 附銑床各圖·························

11、3;······················ 12文獻(xiàn)參考··························

12、83;······················· 13前言畢業(yè)設(shè)計(jì)是學(xué)生在學(xué)完教學(xué)計(jì)劃所規(guī)定的全部課程后，總結(jié)在校學(xué)習(xí)成果，應(yīng)用自己所學(xué)知識和能力進(jìn)行的一次綜合性的大實(shí)踐，在校學(xué)習(xí)的最后一環(huán)，必將對畢業(yè)后的工作產(chǎn)生深遠(yuǎn)的影響。畢業(yè)設(shè)計(jì)培養(yǎng)和鍛煉自己對所學(xué)知識的靈活應(yīng)用，通過畢業(yè)設(shè)計(jì)，可以掌握正確的設(shè)計(jì)方法和設(shè)計(jì)思維方法，進(jìn)一步提高自己有關(guān)機(jī)械制造工藝及設(shè)備方面的設(shè)

13、計(jì)能力，提高制圖、計(jì)算、文字?jǐn)⑹觥⑦\(yùn)用各種標(biāo)準(zhǔn)、規(guī)范、手冊的能力，學(xué)會調(diào)查研究、理論聯(lián)系實(shí)際、鍛煉查閱、分析研究國內(nèi)外有關(guān)資料的能力，鞏固并擴(kuò)大知識領(lǐng)域和視野，學(xué)習(xí)本專業(yè)范圍內(nèi)與設(shè)計(jì)題目有關(guān)的專業(yè)知識，使自己得到更好的鍛煉，以能夠勝任將來的工作的需要。隨著現(xiàn)代機(jī)械工業(yè)的發(fā)展，機(jī)床的種類越來越繁多，機(jī)床的功能越來越多，為了適應(yīng)當(dāng)今機(jī)械生產(chǎn)中的特殊要求，專用機(jī)床的應(yīng)用越來越廣泛。之所以選擇套筒十字槽銑削專機(jī)設(shè)計(jì)作為我的設(shè)計(jì)題目，是因?yàn)槲野l(fā)現(xiàn)以前的銑床雖然功能不少，但是有很多不足之處，比如對工件大批量生產(chǎn)不能滿足，而且生產(chǎn)效率不高，對一些有特殊要求的工件也不能進(jìn)行批量生產(chǎn)。基于這個(gè)前提，我選擇了銑削

14、類的專機(jī)設(shè)計(jì)，主要是針對套筒十字槽的銑削進(jìn)行加工。通過本次設(shè)計(jì)，可以生產(chǎn)出一種銑床滿足套筒十字槽的銑削標(biāo)準(zhǔn)化批量生產(chǎn)，這種銑床既可以滿足特殊的加工要求又節(jié)省了時(shí)間、減少了勞動力。本畢業(yè)設(shè)計(jì)的目的是設(shè)計(jì)出一種銑削類的專用機(jī)床，讓它只對套筒十字槽這一類材料進(jìn)行銑削加工。本機(jī)床結(jié)構(gòu)簡單、集中化程度高、針對性強(qiáng)、工作效率高、能夠適應(yīng)在生產(chǎn)批量大的生產(chǎn)中的要求。它既提高了生產(chǎn)效率，又簡化了操作程序，而且減輕了工人的勞動強(qiáng)度。由于較早以前的銑床應(yīng)用領(lǐng)域比較狹窄，并且對加工特殊要求的工件還不能滿足，這樣就引起了一場技術(shù)革命，銑床得到了廣泛改進(jìn)，它的應(yīng)用范圍也大幅度擴(kuò)大，對銑床新的技術(shù)研究從未停止過。銑床是用

15、多刃銑刀進(jìn)行銑削加工的機(jī)床，銑刀的旋轉(zhuǎn)為主運(yùn)動。由于平面的銑削比刨削生產(chǎn)效率高，因此，早先的銑床是取代刨床而出現(xiàn)的。后來刀具技術(shù)提高了，能夠制造各種復(fù)雜形狀的銑刀，因而銑床從銑削平面擴(kuò)大到能加工各種溝槽、螺旋面、回轉(zhuǎn)面、齒形面以及復(fù)雜的空間曲面。銑床的類型較多，為適應(yīng)加工工件的尺寸和重量，銑床的類型有：升降臺銑床、無升降臺銑床和龍門銑床；為適應(yīng)批量生產(chǎn)的有：圓工作臺銑床、雙端面銑床和鼓輪銑床；為適應(yīng)某些特殊工件加工而發(fā)展的有：工具銑床、鍵槽銑床、曲軸銑床；為適應(yīng)加工復(fù)雜曲面的有：液壓仿形銑床、電氣仿形銑床、數(shù)字程序控制銑床等。此外，還有與鏜削加工相結(jié)合的銑鏜床以及與磨削加工相結(jié)合的銑磨床。當(dāng)然

16、在銑床中夾具的設(shè)計(jì)也是至關(guān)重要的，由于夾具設(shè)計(jì)過程的隨機(jī)因素較多，目前仍有許多企業(yè)沿用傳統(tǒng)的設(shè)計(jì)方法來完成，即由經(jīng)驗(yàn)豐富的工藝人員人工設(shè)計(jì)(或借助二維CAD設(shè)計(jì))。很顯然，這種設(shè)計(jì)方法在很大程度土受夾具設(shè)計(jì)者的經(jīng)驗(yàn)和知識水平的限制，且設(shè)計(jì)周期長，設(shè)計(jì)效率低，勞動強(qiáng)度大，已不適應(yīng)現(xiàn)代制造技術(shù)。因此，開發(fā)出實(shí)用的計(jì)算機(jī)輔助夾具設(shè)計(jì)系統(tǒng)是解決這一間題的重要方法和手段。計(jì)算機(jī)輔助設(shè)計(jì)可以分為概念設(shè)計(jì)、技術(shù)設(shè)計(jì)和詳細(xì)設(shè)計(jì)三個(gè)階段。概念設(shè)計(jì)是計(jì)算機(jī)輔助夾具設(shè)計(jì)中最關(guān)鍵的一個(gè)環(huán)節(jié),它影響著后續(xù)的技術(shù)設(shè)計(jì)和詳細(xì)設(shè)計(jì),是決定夾具方案優(yōu)劣的重要階段。由于銑削加工切削用量及切削力較大，又是多刃斷續(xù)切削，加工時(shí)易產(chǎn)生

17、振動，因此設(shè)計(jì)銑床夾具時(shí)應(yīng)注意：夾緊力要足夠且反行程自鎖；夾具的安裝要準(zhǔn)確可靠，即安裝及加工時(shí)要正確使用定向鍵、對刀裝置；夾具體要有足夠的剛度和穩(wěn)定性，結(jié)構(gòu)要合理。銑床是用銑刀對工件進(jìn)行銑削加工的機(jī)床。銑床除能銑削平面、溝槽、輪齒、螺紋和花鍵軸外，還能加工比較復(fù)雜的型面，效率較刨床高，在機(jī)械制造和修理部門得到廣泛應(yīng)用。本次設(shè)計(jì)主要包括兩大部分。第一部分為套筒十字槽銑削專機(jī)的設(shè)計(jì)，其中包括銑床的基本尺寸的選擇、電機(jī)的選擇、傳動系統(tǒng)的設(shè)計(jì)和銑刀的選擇。首先，銑床的基本尺寸主要參考常用銑床的外形尺寸，并根據(jù)它的需要來確定。可根據(jù)45鋼的切削性能及銑削時(shí)的銑削用量和銑削速度來估算出銑削力和銑削功率來，

18、并根據(jù)銑削功率選擇電動機(jī)。然后，根據(jù)所選電機(jī)的同步轉(zhuǎn)速和銑削速度來確定傳動比，并用齒輪傳動系統(tǒng)來實(shí)現(xiàn)。由于是加工套筒十字槽的銑床，所以根據(jù)工件的需要，選擇最有利的銑削速度，不需要變速，采用單級傳動即可。第二部分為專用夾具的設(shè)計(jì)，其中包括定位方式的選擇、定位誤差的計(jì)算、夾緊方式的確定、夾緊力的確定及夾緊機(jī)構(gòu)的的選擇、導(dǎo)引裝置的確定、夾具體的設(shè)計(jì)和夾具體在機(jī)床上的定位方式。根據(jù)六點(diǎn)定位原理、套筒十字槽的特點(diǎn)及常用定位元件的種類，來確定夾具體的定位方式。由于零件在加工時(shí)，總會產(chǎn)生誤差，因此應(yīng)考慮工件的定位誤差。進(jìn)行定位誤差的計(jì)算，以保證定位誤差在零件加工誤差允許的范圍之內(nèi)。若不合適，則應(yīng)選擇更合適的

19、定位方式，以確保零件的加工精度。為了使零件在被加工時(shí)保持位置不變，應(yīng)對零件在被加工時(shí)所需的夾緊力進(jìn)行估算。在此基礎(chǔ)上，綜合考慮零件的定位方式和加工方式，來設(shè)計(jì)適合的夾緊機(jī)構(gòu)。為保證加工精度，選擇合適的對刀導(dǎo)引裝置，保證工件相對于刀具處于正確的位置。綜合以上各方面的設(shè)計(jì)和各個(gè)裝置的相對位置關(guān)系，可以設(shè)計(jì)出夾具體的結(jié)構(gòu)。并且還要確定夾具體在機(jī)床上的定位方法和定位精度。這樣就完成了夾具的設(shè)計(jì)。由于此次設(shè)計(jì)是根據(jù)實(shí)際生產(chǎn)加工中的需要來進(jìn)行設(shè)計(jì)的，因此還從經(jīng)濟(jì)性方面分析了此次設(shè)計(jì)的可行性。另外，分析了此次設(shè)計(jì)相對于一般生產(chǎn)加工情況的優(yōu)點(diǎn)、此次設(shè)計(jì)的不足，和可能改進(jìn)的方法。關(guān)鍵詞：銑削加工 復(fù)雜 The

20、graduation project is a student after study the plan of instruction stipulated complete curriculum, summarizes in the school study achievement, applies itself to study a comprehensive big practice which the knowledge and ability carry on, in the school study the link, will certainly to have the prof

21、ound influence last after the graduation work. The graduation project raises and exercises itself to study the knowledge the nimble application, through the graduation project, may master the correct design method and the design thought method, further enhances oneself related machine manufacture cr

22、aft and equipment aspect designed capacity, enhances the charting, the computation, the writing narration, to utilize each kind of standard, the standard, handbook ability, the academic society investigation and study, the apply theory to reality, the exercise consult, analytical study domestic and

23、foreign pertinent data ability, consolidates and expands the area of knowledge and the field of vision, studies in this specialized scope with the design topic related specialized knowledge, enables itself to obtain a better exercise, by can be competent future work need. Along with the modern mecha

24、nical industry's development, engine bed's type is getting more and more, engine bed's function are getting more and more, to adapt now in the machinery production special request, special purpose machine's application is getting more and more widespread. The reason that the choice s

25、leeve cross trough milling special plane design takes my design topic, is because I discover the beforehand milling machine, although the function many, but has many deficiencies, for instance cannot satisfy to the work piece production in enormous quantities, moreover the production efficiency is n

26、ot high, has the special request work piece to some not to be able to carry on the volume production. Based on this premise, I have chosen the milling class special plane design, is mainly aims at the sleeve cross trough's milling to carry on the processing. Through this design, may produce one

27、kind of milling machine to satisfy the sleeve cross trough's milling standardization volume production, this kind of milling machine both might satisfy the special processing request and to save the time, to reduce the labor force. This graduation project's goal is designs one kind of millin

28、g class the special purpose machine, lets it only carry on the milling processing to sleeve cross trough this kind of material. This engine bed structure is simple, the centralized degree high, pointed strong, the working efficiency high, can adapt in the production lot big production request. It bo

29、th raised the production efficiency, and simplified the operation sequence, moreover reduced worker's labor intensity. Because the beforehand milling machine application domain is quite early narrow, and to processes the special request the work piece not to be able to satisfy, like this caused

30、a technological revolution, the milling machine obtained the widespread improvement, its application scope also large scale expanded, has never stopped to the milling machine new engineering research. The milling machine is carries on the milling processing with the multi-edge milling cutter the eng

31、ine bed, milling cutter's revolving primarily movement. Because the plane milling is higher than the shaping production efficiency, therefore, the previous milling machine substitutes for the mechanical slicer to appear. Afterward the cutting tool technology enhanced, can make each kind of compl

32、ex shape the milling cutter, thus the milling machine expands from the milling plane to can process each kind of trench, the helicoid, the plane of rotation, the tooth profile surface as well as the complex space-like surface. Milling machine's type are many, for the adaptation processing work p

33、iece's size and the weight, milling machine's type includes: Fluctuation bench miller, non-fluctuation bench miller and planer-type milling machine; Includes for the adaptation volume production: Circle work bench miller, double-end surface milling machine and drum wheel milling machine; In

34、order to adapt certain special work piece processing to develop includes: Tool milling machine, slot-milling machine, crank milling machine; Includes for the adaptation processing complex surface: Hydraulic pressure profiling machine, electricity profiling machine, digital process control milling ma

35、chine and so on. In addition, but also has the mill boring lathe which as well as the mill grinder which unifies with the boring processing unifies with the abrasive machining. Certainly in the milling machine jig's design is also very important, are many as a result of the jig design process

36、9;s random factors, at present still had many enterprises to continue to use traditional the design method to complete, namely designs artificially by the experienced craft personnel (or draws support from the two-dimensional CAD design). Very obviously, this design method in very great degree earth

37、 jig designer's experience and state-of-art limit, and the design cycle is long, the rated capacity is low, the labor intensity is big, did not adapt the modern technique of manufacture. Therefore, develops the practical computer auxiliary jig design system is solves this topic important method

38、and the method. The computer-aided design may divide into the conceptual design, the technical design and the detailed design three stages. The conceptual design is in the computer auxiliary jig design a most essential link, it is affecting the following technical design and the detailed design, is

39、decides the jig plan fit and unfit quality the crucial stage. Because the milling processing cutting specifications and the cutting force are big, when is the multi-edge interrupted cutting, the processing easy to have the vibration, therefore time design milling jig should pay attention: The clampi

40、ng force must and enough counter-traveling schedule self-locking; Jig's installment wants accurately reliable, namely when installment and processing must use the directional key, install correctly to the knife; The jig body must have the enough rigidity and the stability, the structure must be

41、reasonable. The milling machine is carries on the milling processing with the milling cutter to the work piece the engine bed. The milling machine besides can the milling plane, the trench, the gear teeth, the thread and the spline shaft, but can also process the quite complex profile, the efficienc

42、y compares the mechanical slicer to be high, obtains the widespread application at the machine manufacture and the repair department. This design mainly includes two major parts. The first part for sleeve cross trough milling special plane's design, including milling machine's basic size cho

43、ice, electrical machinery's choice, transmission system's design and milling cutter's choice. First, milling machine's basic size main reference commonly used milling machine's external dimensions, and need to determine according to it. May act according to 45 steel time the cutt

44、ing values and the milling milling amount used and the milling speed estimates the milling strength and the milling power comes, and according to milling power choice electric motor. Then, according to chooses electrical machinery's synchronous speed and the milling speed determines the velocity

45、 ratio, and realizes with the gear drive system. Because processes the sleeve cross trough's milling machine, therefore according to the work piece need, chooses the most advantageous milling speed, does not need to change speed, uses the single stage transmission then. The second part for unit

46、clamp's design, including the locate mode the choice, position error's computation, the clamp way determination, the clamping force determination and the clamp organization choice, guidance device determination, jig body's design and jig body's on engine bed locate mode. According to

47、 six localization principles, sleeve cross trough's characteristic and the commonly used setting element's type, determines the jig body's locate mode. Because components in processing time, the general meeting has the error, therefore should consider the work piece the position error. C

48、arries on position error's computation, guarantees the position error, in the components processing error permits in scope. If is inappropriate, should choose the more appropriate locate mode, guarantees the components the working accuracy. In order to cause the components when is processed the

49、hold position is invariable, deals with the components when is processed needs the clamping force carries on the estimate. Based on this, the overall evaluation components' locate mode and the processing way, design the suitable clamp organization. For the guarantee working accuracy, chooses app

50、ropriately to the knife guidance device, guaranteed that the work piece is opposite in the cutting tool is in the correct position. Above the synthesis various aspects' design and each installment's relative position relations, may design the jig body's structure. And must determine the

51、jig body's on engine bed localization method and the pointing accuracy. This has completed jig's design. Because this design is needs to come according to the actual production processing to carry on the design, therefore has also analyzed this design feasibility from the efficient aspect. M

52、oreover, analyzed this design to be opposite in the general production processing situation merit, this design insufficiency, with method which possibly improved. 1 緒論1.1銑床的簡介最早的銑床是美國人惠特尼于1818年創(chuàng)制的臥式銑床；為了銑削麻花鉆頭的螺旋槽，美國人布朗于1862年創(chuàng)制了第一臺萬能銑床，這是升降臺銑床的雛形；1884年前后又出現(xiàn)了龍門銑床；二十世紀(jì)20年代出現(xiàn)了半自動銑床，工作臺利用擋塊可完成“進(jìn)給-決速”或“決

53、速-進(jìn)給”的自動轉(zhuǎn)換。由于較早以前的銑床應(yīng)用領(lǐng)域比較狹窄，并且對加工特殊要求的工件還不能滿足，這樣就引起了一場技術(shù)革命，銑床得到了廣泛改進(jìn)，它的應(yīng)用范圍也大幅度擴(kuò)大，對銑床新的技術(shù)研究從未停止過。銑床是用多刃銑刀進(jìn)行銑削加工的機(jī)床，銑刀的旋轉(zhuǎn)為主運(yùn)動。由于平面的銑削比刨削生產(chǎn)效率高，因此，早先的銑床是取代刨床而出現(xiàn)的。后來刀具技術(shù)提高了，能夠制造各種復(fù)雜形狀的銑刀，因而銑床從銑削平面擴(kuò)大到能加工各種溝槽、螺旋面、回轉(zhuǎn)面、齒形面以及復(fù)雜的空間曲面。銑床的類型較多，為適應(yīng)加工工件的尺寸和重量，銑床的類型有：升降臺銑床、無升降臺銑床和龍門銑床；為適應(yīng)批量生產(chǎn)的有：圓工作臺銑床、雙端面銑床和鼓輪銑床；

54、為適應(yīng)某些特殊工件加工而發(fā)展的有：工具銑床、鍵槽銑床、曲軸銑床；為適應(yīng)加工復(fù)雜曲面的有：液壓仿形銑床、電氣仿形銑床。1.1.1銑床的發(fā)展歷史1950年以后，銑床在控制系統(tǒng)方面發(fā)展很快，數(shù)字控制的應(yīng)用大大提高了銑床的自動化程度。尤其是70年代以后，微處理機(jī)的數(shù)字控制系統(tǒng)和自動換刀系統(tǒng)在銑床上得到應(yīng)用，擴(kuò)大了銑床的加工范圍，提高了加工精度與效率。 1.1.2銑床的分類銑床種類很多，一般是按布局形式和適用范圍加以區(qū)分，主要的有升降臺銑床、龍門銑床、單柱銑床和單臂銑床、儀表銑床、工具銑床等。 升降臺銑床有萬能式、臥式和立式幾種，主要用于加工中小型零件，應(yīng)用最廣；龍門銑床包括龍門銑鏜床、龍門銑刨床和雙柱

55、銑床，均用于加工大型零件；單柱銑床的水平銑頭可沿立柱導(dǎo)軌移動，工作臺作縱向進(jìn)給；單臂銑床的立銑頭可沿懸臂導(dǎo)軌水平移動，懸臂也可沿立柱導(dǎo)軌調(diào)整高度。單柱銑床和單臂銑床均用于加工大型零件。 儀表銑床是一種小型的升降臺銑床，用于加工儀器儀表和其他小型零件；工具銑床主要用于模具和工具制造，配有立銑頭、萬能角度工作臺和插頭等多種附件，還可進(jìn)行鉆削、鏜削和插削等加工。其他銑床還有鍵槽銑床、凸輪銑床、曲軸銑床、軋輥軸頸銑床和方鋼錠銑床等，它們都是為加工相應(yīng)的工件而制造的專用銑床。 另外，按控制方式，銑床又可分為仿形銑床、程序控制銑床和數(shù)控銑床等。2 銑床內(nèi)部結(jié)構(gòu)的各項(xiàng)性能校核設(shè)計(jì)項(xiàng)目設(shè)計(jì)公式與說明結(jié)果設(shè)計(jì)題

56、目根據(jù)提供的圖紙校核各零部件的各個(gè)性能參數(shù)是否合格1.選擇電動機(jī)類型根據(jù)裝配圖上電機(jī)型號：查得Pd=0.75KW，同步轉(zhuǎn)速為1500r/min,滿載轉(zhuǎn)速1390r/min2. 計(jì)算總傳動比i 1=96取帶的傳動比i=3.i 0=32注意：以上傳動比的分配只是初步的，傳動裝置的實(shí)際傳動比要由選定的齒輪齒數(shù)或帶輪基準(zhǔn)直徑準(zhǔn)確計(jì)算，故應(yīng)在各級傳動零件的參數(shù)確定后計(jì)算實(shí)際傳動比，因而很可能與設(shè)定的傳動比之間有誤差。一般允許工作機(jī)實(shí)際轉(zhuǎn)速與設(shè)定轉(zhuǎn)速之間的相對誤差為±（35）%。3.計(jì)算傳動裝置的運(yùn)動和動力參數(shù)各軸轉(zhuǎn)速軸：n =r/min=463r/min軸：n =r/min=14。5r/min

57、設(shè)計(jì)項(xiàng)目設(shè)計(jì)公式與說明結(jié)果4.各軸的輸入功率軸：P =Pd· 01=0.75×0.97=0.72KW軸：P =P · 12= P · 1·2=0.72×0.97×0.99=0.7KW5.各軸的輸入轉(zhuǎn)矩T d=9550·=9550×=5.153N·M軸：T =9550·=9550×=14.85N·M運(yùn)動和動力參數(shù)的計(jì)算結(jié)果列于表2-56.帶傳動確定設(shè)計(jì)功率Pd（1）由表9-9查得工作情況系數(shù)K A=1.2（2）據(jù)式Pd=K A·P=1.2×0.75

58、=0.9KW7.選擇V帶型號查圖9-9。選A型V帶8.確定帶輪直徑d d1、d d2(1) 考圖9-9及表9-4，選小帶輪d d1=75mm（2）驗(yàn)算帶速 由式（9-18）V=5.46(m/s)(v 1在525m/s內(nèi)，合適)（3）從帶輪直徑d d2=i d d1=3×75=225查表9-4，取d d2=224傳動比 i=2.99(i=3)(4)從動輪轉(zhuǎn)速n 2 n 2=463r/min9.確定中心距a和帶長Ld（1）按式（9-19）初選中心距a 0 0.7（75+224） a 021（75+224） 209mm a 0 6279mm 取a 0=1000（2）按式（9-20）求帶的計(jì)

59、算基準(zhǔn)長度L d0 L d0=2 a 0+( d d1+ d d1) 設(shè)計(jì)項(xiàng)目設(shè)計(jì)公式與說明結(jié)果=2×1000×(75+224)+ =2000+×299+ =2475 (3) 查表9-2，取帶的基準(zhǔn)長度L d=2240（4）按式（9-21）計(jì)算實(shí)際中心距a=a o+=1000+=883按式（9-22）確定中心距調(diào)整范圍a max=a+0.03L d=882.5+(0.03×2240)=949.7a min=a-0.015L d=882.5-(0.015×2240)=848.910.驗(yàn)算小帶輪包角由式（9-23） 180°×5

60、7.3° =180°×57.3° 170°120° （合適）11.確定V帶根數(shù)z（1）由表9-5查d d1=125，n 1=950r/min及n 1=1200r/min時(shí)，單根B型V帶的額定功率為0.51KW和0.6KW，用線性插值法求n 1=1200r/min時(shí)的額定功率值 P 1=0.51+×（1200-950）=0.6KW由表9-6查得P o=0.17KW（2）由表9-7查得包角修正系數(shù)Ka=0.98 (3) 由表9-8查得帶長修正系數(shù)K L=1.06（4）計(jì)算V帶根數(shù)Z由式（9-24）Z=2 （取Z=2根）12.計(jì)算

61、單根V帶初拉力F0由表9-1查得m=0.1kg/m由式（9-25）F 0=5001+mv2 設(shè)計(jì)項(xiàng)目設(shè)計(jì)公式與說明結(jié)果=500×1+0.1×5.65 65N (取F 0=65N)13.計(jì)算對軸的壓力F Q由式9-27F Q22F 0sin=2×2×65×sin =4×65×sin80 259N14.帶輪的結(jié)構(gòu)設(shè)計(jì)根據(jù)實(shí)際情況選定小帶輪基準(zhǔn)直徑d d1=75，采用實(shí)心式結(jié)構(gòu)，大帶輪基準(zhǔn)直徑d d2=224，采用孔式結(jié)構(gòu)。15.選擇齒輪材料、熱處理方法及精度等級（1）機(jī)床內(nèi)的傳動是封閉式傳動，無特殊要求，為制造方便，采用軟齒面鋼

62、制齒輪。查表6-1，并考慮HBS 1=HBS 2+3050的要求，小齒輪選用45鋼，調(diào)質(zhì)處理，齒面硬度217255HBS，大齒輪選用45鋼，正火處理，齒面硬度162217，計(jì)算時(shí)取HBS 1=240HBS，HBS 2=200HBS（2）該傳動為一般傳動裝置，轉(zhuǎn)速不高，根據(jù)表6-2，初選8級精度。16.按齒面接觸疲勞強(qiáng)度設(shè)計(jì)（1）載荷系數(shù)K（2）小齒輪傳遞的轉(zhuǎn)矩（3）齒數(shù)Z和齒寬系數(shù)d(4)許用接觸應(yīng)力 H由于是封閉式軟齒面齒輪傳動，齒輪承載能力應(yīng)由齒面接觸疲勞強(qiáng)度決定，由式（6-11）d 1有關(guān)參數(shù)的選取與轉(zhuǎn)矩的確定由于工作平穩(wěn)，精度不高，且齒輪為不對稱布置，查表6-3，取K=1.2T 1=9

63、.55×10=9.55×10×=5153N·根據(jù)已知條件得知小齒輪Z 1=32,而大齒輪Z 2=58實(shí)際傳動比 i 12=2 故誤差i<2.5% 故合適齒輪比u= i 12=2查表6-6，取d=0.9 H=由圖6-8（c）查得： Hlim1=590MPa Hlim2=555MPa取S H=1，計(jì)算應(yīng)力循環(huán)次數(shù) N 1=60n 1jL h=60×1390×1×(2×8×300×10) =4.01×10N 2= N 1/u=2.01×10設(shè)計(jì)項(xiàng)目設(shè)計(jì)公式與說明結(jié)果(5)節(jié)點(diǎn)

64、區(qū)域系數(shù)Z H（6）彈性系數(shù)Z E由圖6-6查得ZN1=1.05 ZN2=1.15（允許齒面有一定量點(diǎn)濁） H 1= =620MPa H2= =638MPa取小值代入 故取 H=620MPa標(biāo)準(zhǔn)齒輪=20°，則Z H=2.49兩輪材料均為鋼，查表6-4，Z E=189.8將上述各參數(shù)帶入公式得d1 = =109模數(shù) m=2.1由表5-2 取m=217.主要尺寸計(jì)算（1）分度圓直徑d（2）齒寬（3）中心距d 1=mZ 1=2×58=116d2=mZ2=2×32=64b1= dd 1=0.9×58=52.2取b1=57 b2=52a=m(Z 1+Z 2)=

65、×2×(58+32)=9018.校核齒根彎曲疲勞強(qiáng)度（1）齒形系數(shù)Y Fa與齒根應(yīng)力修正系數(shù)Ysa（2）許用彎曲應(yīng)力 F由式（6-13） F=Y Fa1Y Sa1 F查表6-5得 Y Fa1=2.52 YFa2=2.32 Y Sa1=1.625 Y Sa2=1.70 F=查表6-9c得=430MPa =410MPa查圖6-9C得 S=1.4設(shè)計(jì)項(xiàng)目設(shè)計(jì)公式與說明結(jié)果Y=1 =307.14 MPaY=1 =292.8 MPa F1=Y Fa1Y Sa1=×2.52×1.625 =7.34MPa F 1 F2= F1=7.34× =0.96MPa F219.齒輪的圓周速度V=2.33m/s5m