【導(dǎo)讀】柱齒輪，還可加工蝸輪、鏈輪等。其工作臺由工作臺殼體、蝸輪、蝸桿、儲油匣等組成。按照加工原理，齒面加工可以分為成形法和展成法兩大類。Y38滾齒機(jī)選擇范成法加工。齒輪的優(yōu)點是，只要模數(shù)和壓力角相同，一把刀具可以加工任意齒數(shù)的齒輪。加工精度都比較高。所以在齒輪加工中，范成法應(yīng)用最為廣泛。作為機(jī)械制造業(yè)的基礎(chǔ)裝備的金屬切削機(jī)床，在國民經(jīng)濟(jì)中占有重要地位，而齒輪。作為機(jī)械傳動中最常見，最重要的傳動零件，被廣泛地應(yīng)用于機(jī)械設(shè)備的傳動系統(tǒng)中。切削機(jī)床之中占有舉足輕重的作用。我主要設(shè)計的部分是：分齒掛輪系統(tǒng)和機(jī)床工作臺的，分齒掛輪主要是。通過不同的掛輪來實現(xiàn)兩末端件的復(fù)雜的關(guān)系。工作臺為箱型結(jié)構(gòu)，裝在床身的矩形軌。具體外形尺寸，見工作裝配。

　　

【正文】 ? ? ? （ 2）確定載荷系數(shù) K : 因為工作載荷穩(wěn)定，故取載荷分布不均系數(shù) 1K?? ，由表 115（參考文獻(xiàn) [5]）選取使用系數(shù) ? ，由于轉(zhuǎn)速不是很高，沖擊不大，可取動載系數(shù) ? ，則： 1 . 1 5 1 1 . 0 5 1 . 2 1AVK K K K?? ? ? ? ? （ 41） （ 3）確定彈性影響系數(shù) EZ ： 因選用的是鑄錫磷青銅和鋼蝸桿相配，故 12160EZ MPa? 。 （ 4）確定接觸系數(shù) Z? ： 畢業(yè)設(shè)計（論文）說明書 九七一九二零八零零全套資料請加 Q 25 先假設(shè)蝸桿分度圓直徑 1d 和傳動中心距 a 的比值 1 a ?，從圖 1118（ 參考文獻(xiàn)[5]） 中可查得 ?? 。 （ 5） 確定許用接觸應(yīng)力 ? ?H? ： 根據(jù)蝸輪材料為鑄錫磷青銅 ZCuSn10P1，金屬模鑄造，蝸桿螺旋齒面硬度 45 HRC，可從表 117（ 參考文獻(xiàn) [5]） 中查得蝸輪的基本許用接觸應(yīng)力 ? ?39。 268H MPa? ? 。 應(yīng)力循環(huán)次數(shù) 72 5666 0 6 0 1 2 4 0 0 0 1 . 0 2 1 080hN jn L? ? ? ? ? ? ? （ 42） 壽命系數(shù) 778871 0 1 0 0 . 9 9 81 . 0 2 1 0HNK N? ? ?? （ 43） 則 ? ? ? ?39。 0 . 9 9 8 2 6 8 2 6 7H H N HK M P a M P a??? ? ? ? ? （ 6） 計算中心距： 22 332 160 ( ) [ ] 267EPHZZa K T mm mm? ???? ? ? ? ????? （ 45） 取中心距 225a mm? ，因 80i? ，故從表 112（ 參考文獻(xiàn) [5]） 中取模數(shù) mm? ，蝸桿分度圓直徑 1 63d mm? 。這時 1 ? ，從圖 1118（ 參考文獻(xiàn) [5]） 中可查得接觸系數(shù) 39。 ? ? ，因為 39。ZZ??? ，因此以上計算結(jié)果可用。 蝸桿與蝸輪的主要參數(shù)與幾何尺寸 圖 普通圓柱蝸桿傳動的基本幾何尺寸 畢業(yè)設(shè)計（論文）說明書 九七一九二零八零零全套資料請加 Q 26 1）蝸桿： 蝸輪蝸桿傳動比： 80?i ，模數(shù)： ?m ； 蝸桿分度圓直徑： mmd 631 ? ； 蝸桿導(dǎo)程角： 5 4239。38? ? ； 蝸桿軸向齒距： ap = mmm ?? ； 蝸桿軸向齒厚： as =21 mmm ?? ； 蝸桿齒頂高： 1ah = mmmh a * ? ； 蝸桿齒根高： 1fh =( mmmcha )* ??? ； 蝸桿齒高： mmhhh fa ??? ； 蝸桿齒頂圓直徑： mmmhdhdd aaa 1111 ????? ?； 蝸桿齒根圓直徑 ： mmcmhdhdd arr )2(2 1111 ?????? ?； 頂隙： mmmcc * ?? ； 其中 ( ?ah =1； ?c =) 2）蝸輪： 蝸輪齒數(shù)： 8012 ??? iZZ ，變位系數(shù)： ??x ； 蝸輪分度圓直徑： mmmZd 50422 ?? ； 蝸輪齒頂高 : mmxhmddhaaa )()(21 2*222 ?????； 蝸輪齒根高： mmcxhmddhaff )()(21 *2*222 ??????； 蝸輪喉圓直徑： mmmmhdd aa 5 1 1 02 222 ???? ； 蝸輪齒根高直徑： mmhdd ff 222 ??? ； 蝸輪咽喉母圓直徑： mmdaraa 3421 22 ???； mmmmmxdda 2 221 ?????????? 畢業(yè)設(shè)計（論文）說明書 九七一九二零八零零全套資料請加 Q 27 其中 ( ?ah =1； ?c =) 校核齒根彎曲疲勞強(qiáng)度 校核蝸輪輪齒的彎曲強(qiáng)度不只是為了判別其彎曲斷裂的可能性，對那些承受重載的動力蝸桿副，蝸輪輪齒的彎曲變形量還要直接影響到蝸桿副的運(yùn)動平穩(wěn)性精度。 由于蝸輪輪齒的齒 形比較復(fù)雜，要精確計算齒根的彎曲應(yīng)力是比較困難的，所以常用的齒根彎曲疲勞強(qiáng)度計算方法就帶有很大的條件性。我們此次采用公式（參考文獻(xiàn)[5]）： F? = ?BFa YYmdd KT 212 [ F? ] （ 46） 當(dāng)量齒數(shù)： c os 322 ?? ?ZZ v （ 47） 根據(jù) ??x ， ?vZ 。從圖 1119（參考文獻(xiàn) [5]）中可查的齒形系數(shù) ?2FaY ，螺旋角系數(shù) 9 5 9 4 01 ??? ???Y ； 許用應(yīng)力： FNFF K?? 39。][][ ?? （ 48） 從表 118（參考文獻(xiàn) [5]）查得 2CuSn10P1，制造的蝸輪的基本許用彎曲應(yīng)力MPaF 56][ 39。 ?? ； 壽命系數(shù)： 669971 0 1 0 0 . 9 9 51 . 0 2 1 0HNK N? ? ?? （ 49） 則 n the market. The philosophical approach to a particular design depends somewhat on the kind of industry or the kind of machine. A chemical plant, which is a large and plicated machine, may be a oneshot proposition. One plant only is designed and built. If the design is not right, the mistakes are corrected on the job, an expensive but necessary procedure, until the plant operates as planned. The designer who works where only one product is made from the design develops attitudes or philosophies quite different, for instance, from an airplane or automotive designer. In the airplane industry, light weight and reliability ate if utmost importance. The philosophy of the airplane designer leads him to relatively highprecision (and 畢業(yè)設(shè)計（論文）說明書 九七一九二零八零零全套資料請加 Q 28 highcost) designs, because the results are worth the money. Often the designed product is manufactured and operated under actual or simulated actual conditions, perhaps repeatedly, before the design is considered acceptable. In the automotive industry, the designer wants to be sure that his designer wants to be sure that his design is suitable for mass production. A subassembly design, such as the transmission, which will be made in quantities of hundreds of thousands or in millions, will be tested under actual operating conditions, because the “bug” need to be eliminated before mass production begins. In heavy industries such as the manufacture of large pressure vessels, the designer does not think in terms of the precision necessary in an airplane engine, nor is he particularly concerned about the weight. Moreover, there is no mass production in the automotive sense. If theory and practice do not agree, either theory or practice is wrong. Methods of design undergo an evolutionary process, just as a machine invariably evolves into better and better forms. New discoveries are made each day, but, because many theories are or bee inadequate, we never know when the accepted formula will be discarded. In any derivation, we first make certain assumptions in order to simplify the Product liability actions have made it imperative that designers and panies employ the very best procedures in selecting materials. The five most mon faults in material selection have been: (a) failure to know and use the latest and best information available about the materials utilized。 (b) failure to foresee, and take into account the reasonable uses for the product (where possible, the designer is further advised to foresee and account for misuse of the product, ass there have been many product liability cases in recent years where the claimant, injured during misuse of the product, has sued the manufacturer and won)。 (c) the use of materials about which there was insufficient or uncertain data, particularly as to its longterm properties。 (d) inadequate, and unverified, quality control procedures。 and (e) material selection made by people who are pletely unqualified to do so. An examination of the faults above well lead one to conclude that there is no good 畢業(yè)設(shè)計（論文）說明書 九七一九二零八零零全套資料請加 Q 29 reason why they should exist. Consideration of them provides guidance as to how they can be eliminated. While following the very best methods in material s