【正文】 40 7 11 1 12 機(jī)電職業(yè)技術(shù)學(xué)院 22 圖 57 其他零件 1．水嘴 水嘴的推薦尺寸見《模具設(shè)計(jì)與制造簡(jiǎn)明手冊(cè)》表 2150。 密封螺釘 密封螺釘為自制件，如圖 510所示。以檢驗(yàn)樣 件來修正和驗(yàn)收模具，是塑料模具這種特殊產(chǎn)品的特殊性。原因分析： 1．粘著模腔 制品粘著在模腔上，是指塑件在模具開啟后，與設(shè)計(jì)意圖相反，離開型芯一側(cè)，滯留于模腔內(nèi)，致使脫模機(jī)構(gòu)失效，制品無法取出的一種反常現(xiàn)象。 （ 4） 模芯溫度高于模腔溫度，造成反向收縮。 （ 3） 模腔溫度過高，使制件在設(shè)定溫度內(nèi)不能充分固化。 （ 2） 料道徑向尺寸相對(duì)制品壁厚過大，冷卻時(shí)間內(nèi)無法完成料道物料的固化。 一旦發(fā)生上述情況，首先要設(shè)法將制品取出模腔（芯），不惜破壞制件，保護(hù)模具成型部位不受損傷。 （ 1） 注射填充不足 所謂填充不足是指在足夠大的壓力、足夠多的料量條件下注射不滿型腔而得不到完整的制件。盡量采用整圓形、梯形等相似的形狀 ，避免采用半圓形、球缺形料道。 b. 型腔排氣不良 這是極易被忽視的現(xiàn)象，但以是一個(gè)十分重要的問題。應(yīng)調(diào)大鎖模力，保證正常制件料量。這時(shí)要繼續(xù)注射，提高模具溫度、降低注射壓力，縮短保壓時(shí)間 ，制件尺寸可得到改善。 對(duì)以上出現(xiàn)的缺陷調(diào)試時(shí)，盡可能先采用改變成形工藝條件，后采用修正模具來消除成形缺陷。 模具條件：加大主流道、分流道和澆口；減小澆口區(qū)面積；加大噴嘴；增加排氣槽；改變澆口位置。 模具條件：矯正修理分型面。 模具條件：加大噴嘴；改變冷卻水道位置。 模具條件：加大主流道、分流道和澆口；減小澆口區(qū)面積；加大噴嘴；改變冷卻水道位置；改變澆口位置。 機(jī)電職業(yè)技術(shù)學(xué)院 27 模具條件：加大主流道、分流道和澆口；改變 冷卻水道位置；增加排氣槽；改變澆口位置；研磨模腔表面；增加冷料穴容量；研磨主流道、分流道和澆口。 模具條件：改變噴嘴位置；研磨主流道襯套；改變主流道拉料桿形式。 模具條件：加大主流道、分流道和澆口；減小澆口區(qū)面積；改變冷卻水道位置；增加排氣槽；改變澆口位置；研磨模腔表面；增加冷料穴容量；研磨主流道、分流道和澆口。因此，與之相適應(yīng)的塑料模制造業(yè)的發(fā)展就更加迅速。 通過本次畢業(yè)設(shè)計(jì)，我從對(duì)模具的設(shè)計(jì)與制造有一個(gè)感性認(rèn)識(shí)到具體的了解熟悉模具的設(shè)計(jì)制造過程，學(xué) 到了在模具行業(yè)中的很多知識(shí)。 Also prompt building material mould development , various heterotype material the mould , wall surface and floor mould bee new mould growth point , plastic doors and windows and plastic drainpipe increase to exceeding 30 by in the uping several years %。 2) quickcutting diminutions cut a force。 2) high speed highaccuracy finish machining replace only entire the height processing , indicating mass , form accuracy rise , 50%, cuts down repair a mill by hand than EDM processes a potentiation。s processes a machine tool Mould finish machining and hard cutting treating require that the numerical control highspeed machine tool , form board , model put up the precision processing need , higheffect numerical control machine tool mould aiming at produces a lot of machine tool enterprise , some treating centres 60% all above of the machine tool producing a factory sells enterprise to a mould. The fixed assets having 5 billion yuan without exception in the uping several years throws into mould industry , 80% is the machine tool buying a mould process equipment , just saying every year having 4 billion yuan of RMB to buy Jinqie among them. At present average our country numerical control machine tool utilization ratio approximately 20%, the highspeed machine tool utilization ratio 3 ~ 5%. Also, mould enterprise has the unit suitable to buy a highspeed machine tool , plies with 6000 ~ 40000 rmp39。 2) treating range is big , the various type mould suitable processes。s hardness but amount to 6000 ~ 10000 HV. Germany SCS , Japan Mitsubishi (magical steel) and Sumitomo , Switzerland Shanteweike , USA Kenna are in recent years swiftly large wait for the famous abroad cutter pany to successively have debuted the respective quickcutting cutter, not only cutter having average structural steel of quickcutting, the ceramics cutter still having direct quickcutting of energy quenching hard steel is waiting for an effect to surpass the hard cutter, especially the coating cutter appears all of a sudden , bringing into play in quenching half finish machining and finish machining of hard steel. New cutter material and cutter technology appearing already make the bottleneck problem that high speed has processed no longer be able to appear on the cutter. But, expensive entrance cutter price also blocks quickcutting mould key factor. Above to e to saying the cutter and the cutter holder acceleration reach 3 gs the sort, the cutter circular runout needs to be smaller than mm, but the knife length is unable greater than 4 times cutters diameter. The reality according to SANDVIK pany has counted , the carbide alloy has stood on in the entirety using carbon nitriding titanium (TICN) coating when milling cutters (58 HRC) carry out high speed bright metal chopping , rough process cutter linear speed has been 100 m/min about , whose linear speed has exceeded but 280 m/min when finish machining and microstoning. Such demands to cutter material (include the hardness , tenacity , red hardness keep the form (include row of crumbs function , surface accuracy , dynamic balance sex etc. (cutting the function) , the cutter under high temperature state)) as well as cutter lifespan all has very highly. Experience according to in the homeland mould high speed finish machining, linear speed has exceeded 400 ~ 800 m/min when adopt the young diameter ball head milling cutter to carry out mould finish machining. The machine tool choosing sufficient highspeed39。 3 the softwares buying CAD/CAM and highspeed machine tools assort On the grounds of the machine tool , major part counting , having several billions U. S. dollar to be used to enter port every year, the electromachining machine tool and the highspeed machine tool need to import. Three, quickcutting mould cutter technology Quickcutting processes the cutter needing allocating proper quickcutting. Progressing processing cutter material39。 The finish machining mould wants to need to reach 15000 ~ 20210 rmp like the cutter , the machine tool with minor diameter. Generally, the chief axis rotation rate machine tool under 10000 rpm can carry out rough process and half finish machining , cannot reach the finish machining accuracy。 4) the surface loss that EDM treating produces , improve mould lifespan 20%。 4) quickcutting cut down vibration , improve treating mass。 The IT industry year increases % speed equally exceeding 20 , the need to the mould accounts for 20 of mould marketplace %.2021 annual Chinese machine tools implements industry output value will continue to increase. Our country mould fabrication market potential is enormous. The basis data counts , in recent years, our country mould year gross output value reaches 3 billion U. S. dollar , entrance exceeds 1 billion U. S