【正文】
給量和實(shí)際轉(zhuǎn)速,取 rmmf /? ,min/198rnw ? ,實(shí)際切削速度 min/ mv ? 。 選擇鉆頭 選擇高速鋼麻花鉆頭(如圖 3 所示),其直徑 d=12mm 鉆頭幾何形狀為(根據(jù)《切削用量手冊》表 及表 ):標(biāo)準(zhǔn)鉆頭, 25???,2 120 ,Kr??,后角 0 11???, 50???,橫刃長度 mm? ,弧面長度 5l mm? 。 4.計(jì)算基本工時(shí) 根據(jù)公式 nfLtm? 式中, ???? ylL , l=40mm,入切量及超切量由《切削用量手冊》表 查出6y mm??? ,計(jì)算得, L=( 40+6) mm=46mm 故有: t= ? = 工步二:鉆殼體頂面 M6 螺紋底孔Φ 深 18 選用 ? 高速鋼錐柄麻花鉆(《工藝》表 - 6) 由《切削》表 《工藝》表 - 16查得 /f mm r?機(jī) min/10mv ? (《切削》表 ) m in/ 10100 0100 0 rD vn ? ??? ?? ? 636r/min 按機(jī)床選取 n=600r/min min/ mdnv w ????? ?? 切削工時(shí): mml 181 ? , mml ? , mml 03 ? 則機(jī)動(dòng)工時(shí)為 ??? ?????? ifn lllt wm 工步三:攻殼體頂面 M6 螺紋深 16 選擇 M6mm 高速鋼機(jī)用絲錐 f 等于工件螺紋的螺距 p ,即 f= / mincVm?機(jī) m in/6 rD vn ???? ?? ? 478r/min 按機(jī)床選取 n=475r/min 15 切削工時(shí): mml 161 ? , mml ? , mml 03 ? 則機(jī)動(dòng)工時(shí)為 ??? ?????? ifn lllt wm 工序 08:锪平 4Φ 16 加工條件 加工材料 :鑄鐵 工藝要求:孔徑 d=16mm,精度 H12~H13,用乳化液冷卻。 切削速度的修正系數(shù)為: ?TvK , ? , ? , ?tvK , 故 vc kvv ?? =75????? 01000d vn ?? = 16 ??? r/mm=896r/mm 根據(jù) Z3025 型鉆床技術(shù)資料(見《簡明手冊》表 )可選擇 n=800r/mm,c v =25mm/min 4.計(jì)算基本工時(shí) 根據(jù)公式 nfLtm? 式中, ???? ylL , l=8mm,入切量及超切量由《切削用量手冊》表 查出黑龍江八一農(nóng)懇大學(xué)本科畢業(yè)設(shè)計(jì) 16 6y mm??? ,計(jì)算得, L=( 8+6) mm=14mm 故有: t= m in4 14 ??= 工序 09:鉆 4Φ 7 孔 加工條件 加工材料 :鑄鐵。 選擇鉆頭 選擇高速鋼麻花鉆頭(如圖 3 所示),其直徑 d=12mm 鉆頭幾何形狀為(根據(jù)《切削用量手冊》表 及表 ):標(biāo)準(zhǔn)鉆頭, 25???,2 120 ,Kr??,后角 0 11???, 50???,橫刃長度 mm? ,弧面長度 5l mm? 。 4.計(jì)算基本工時(shí) 17 根據(jù)公式 nfLtm? 式中, ???? ylL , l=8mm,入切量及超切量由《切削用量手冊》表 查出6y mm??? ,計(jì)算得, L=( 8+6) mm=14mm 故有: t= m in4 14 ??= 工序 10:锪平 6Φ 14 加工條件 加工材料 :鑄鐵 工藝要求:孔徑 d=14mm,精度 H12~H13,用乳化液冷卻。 切削速度的修正系數(shù)為: ?TvK , ? , ? , ?tvK , 故 vc kvv ?? =75????? 01000d vn ?? = 14 ??? r/mm=921r/mm 根據(jù) Z3025 型鉆床技術(shù)資料(見《簡明手冊》表 )可選擇 n=800r/mm,c v =25mm/min 黑龍江八一農(nóng)懇大學(xué)本科畢業(yè)設(shè)計(jì) 18 4.計(jì)算基本工時(shí) 根據(jù)公式 nfLtm? 式中, ???? ylL , l=7mm,入切量及超切量由《切削用量手冊》表 查出6y mm??? ,計(jì)算得, L=( 7+6) mm=13mm 故有: t= m in6 013 ??= 工序 11:鉆 6Φ 7 孔 加工條件 加工材料 :鑄鐵。 選擇鉆頭 選擇高速鋼麻花鉆頭(如圖 3 所示),其直徑 d=12mm 鉆頭幾何形狀為(根據(jù)《切削用量手冊》表 及表 ):標(biāo)準(zhǔn)鉆頭, 25???,2 120 ,Kr??,后角 0 11???, 50???,橫刃長度 mm? ,弧面長度 5l mm? 。 4.計(jì)算基本工時(shí) 根據(jù)公式 nfLtm? 式中, ???? ylL , l=8mm,入切量及超切量由《切削用量手冊》表 查出6y mm??? ,計(jì)算得, L=( 8+6) mm=14mm 故有: t= m 14 ?? = 工序 12:銑 28?5槽 1. 選擇刀具 刀具選取三面刃銑刀,刀片采用 YG8, mmap 5? , mmd 1000 ? , min/200mv ? , 4?z 。通孔,精度 H12~H13,用乳化液冷卻。 ( 2)計(jì)算切削速度 根據(jù)《切削用量手冊》表 ,當(dāng)鑄鐵硬度 b? =200~ 220HBS 時(shí), /f mm r? , 0 20d mm? 時(shí), cv =30mm/min。 機(jī)床:選用臥式鉆床和專用夾具。 切削速度的修正系數(shù)為: ?TvK , ? , ? , ?tvK , 故 vc kvv ?? =30????? 01000d vn ?? = 12 ??? r/mm= 根據(jù)臥式鉆床技術(shù)資料(見《簡明手冊》表 )可選擇 n=600r/mm, cv =20mm/min。 定位基準(zhǔn)的選擇 擬定加工路線的第一步是選擇定位基準(zhǔn)。此道工序后面還有精加工,因此本次銑沒有較高的技術(shù)要求,也沒有較高的平行度和對稱度要求,所以我們應(yīng)考慮如何提高勞動(dòng)效率,降低勞動(dòng)強(qiáng)度,提高加工精 度。 28 毛坯孔配合限制兩個(gè)自由度。 。在此,我衷心感謝我的指導(dǎo)老師,特別是每次都放下他的休息時(shí)間,耐心 地幫助我解決技術(shù)上的一些難題,他嚴(yán)肅的科學(xué)態(tài)度,嚴(yán)謹(jǐn)?shù)闹螌W(xué)精神,精益求精的工作作風(fēng),深深地感染和激勵(lì)著我。 黑龍江八一農(nóng)懇大學(xué)本科畢業(yè)設(shè)計(jì) 30 致 謝 這次畢業(yè)設(shè)計(jì)使我收益不小,為我今后的學(xué)習(xí)和工作 打下了堅(jiān)實(shí)和良好的基礎(chǔ)。從課題的選擇到項(xiàng)目的最終完成, 她 都始終給 予我細(xì)心的指導(dǎo)和不懈的支持。 mold processing First, foreword In the modern mold production, along with to models artistic and the function must obtain more and more high, models the internal structure to design more and more plex, the mold contour design day by day is also plex, the free curved surface accounts for the proportion to increase unceasingly, the corresponding mold structure also designs more and more plex. These all set a higher request to the mold processing technology, not only should guarantee the high manufacture precision and the surface quality, moreover must pursue the processing surface artistic. Along with is unceasingly thorough to the high speed processing engineering research, is processing the engine bed, the numerical control system, the cutting tool system, CAD/ especially Correlation technology and so on CAM software develops unceasingly under the impetus, high speed processes the technology more and more many to apply in the mold cavity processing and the manufacture. The numerical control highspeed cutting processing took in the mold manufacture a most important advanced manufacture technology, is the collection is highly effective, high quality, the low consumption in a body advanced manufacture technology. Is opposite in the traditional machining, its cutting speed, entered to the speed had the very big enhancement, moreover cut the mechanism not to be same. The highspeed cutting caused the machining to have the leap, its specific power metal excision rate enhanced 30%~40%, the cutting force reduced 30%, the cutting tool working durability enhanced 70%, remained hotly large scale reduces in the work piece cutting, the low step shudder vanished nearly. Along with the cutting speed enhancement, unit time semifinished materials material removing rate increased, the cutting time reduced, the processing efficiency enhanced, thus reduced the product manufacture cycle, enhanced the product market petitive power. At the same time, the 33 high speed processing small amount entered quickly causes the cutting force to reduce, the scrap high speed discharged reduced the work piece cutting force and the thermal load distorts, enhances the rigidity to be bad and the thin wall ponents machining possibility. Because cutting force reducing, the rotational speed enhancement causes the cutting system the operating frequency to be far away the engine bed the low step natural frequency, but the work piece surface roughness is most sensitive to the low step frequency, from this reduced the surface roughness. In mold high hard steel stock (HRC45~HRC65) in the processing process, uses the highspeed cutting to be possible to sub