鬧鐘外殼注塑模設(shè)計,鬧鐘,外殼,注塑,設(shè)計 Design of Small Core Drawing Mechanism for Injection Mould Abstract: Four kinds of small and nimble core drawing mechanism for injection mould of case type plastic items are introduced in details. Key words: injection mould, core drawing, sliding block Case type plastic items play an important role in the production of modern plastic-electronic items. In general, knots sometimes together with a bolt are used to enhancer and smooth the surface of the electronic products. A mould often holds several work pieces, and core drawing is used many times in just one work piece. If we use traditional outside slanting pillar or inside slanting slide block in core drawing, the mechanism of the mould would be very complicated. In practice, Figure 1 1. moving die insert 2. moving die pate 3. spring 4. core slide block 5. fixed die insert 6. fixed die plate 7. lock insert block 8. center pin 9. spring 10.fixed plate of moving die according to the property that the stroke of core drawing of plastic items is very short, several kinds of core drawing mechanisms are designed as follows. 1 Outside core drawing mechanism Outside core drawing mechanism as in Fig.1 is similar to traditional slanting pillar core drawing mechanism, Because of the short stroke of core drawing, slanting pillar is removed. Lock insert block 7 and core slide block 4 serve together to accomplish the action of reset and lock. When the mould is opened, moving die and fixed die are parted and core slide block 4 finishes core drawing under control of spring 3. Center pin 8 is used to locate the core slide block. Core slide block 4 has T guide way machined to ensure the accuracy of core drawing movement. Figure 2 1. moving die insert 2. center pin 3. core slide block 4. fixed die insert 5. lock insert 6. fixed die plate 7. spring 8. moving die plate 2 Inside core drawing mechanism Slanting slide block detached core drawing or drawing or slanting thimble are often used in traditional inside core drawing mechanisms. It is hard to machine. Because the distance of friction movement of slanting slide pole is long, and friction device is hidden in the middle of the mould, it is difficult to lubricate and the slanting slide pole tends to be easily worn down. Slanting slide block inside drawing mechanism in Fig.2 solves this problem well. When the dies are closed, core slide block 3 resets under the influence of lock insert 5. When the dies are opened, block 3 and lock insert 5 is parted and block 3 finishes core drawing under control of spring 7. Center pin 2 is used to locate the core slide block. The whole mechanism is dependent and easy to machine. 3 Compound mechanism that core draws inside and outside at the same time When a mould holds several different work-pieces and has to be core drawn inside and outside at the same time, compound core drawing mechanism illustrated in Fi.3 can be used. The picture shows the state when the dies are closed. The Figure 3 1.moving die insert 2.spring 3. outside core insert 4. fixed die insert 5.fixed die plate 6. lock insert 7. fixed die insert 8. moving die insert 9.inside core insert 10. core slide block 11. center pin 12. moving die plate slants of lock insert 6 and core slide block 10 cooperate to reset and lock the core. When the dies are opened, core slide block 10 finishes inside and outside core drawing at the same time under control of spring 2. The position is limited by center pin 11. To make the core easily machined and conveniently maintained, the core can be made to be assembled. When two different cases need core drawing outside at the same time, compound mechanism in Fig.4 can be used. With the use of two slanting insert blocks, the mechanism is simplified, and the strength condition on lock insert is greatly improved. 4 A simplified core drawing mechanism For outside core drawing whole mould space is not so large, a simplified mechanism as shown in Fig.5 can be used. When the dies are closed, slanting slide block 3 oppresses spring 6 and resets under the influence of fixed die insert 1. Figure 4 1. moving die insert 2. fixed die plate 3. spring 4. moving die plate 5. spring 6. core slide block 7. fixed die insert 8. fixed die plate 9. lock insert 10. fixed die insert 11. core slide block 12.spring 13.spring 14.moving die insert Two guide pins 5 serve to guide. When the dies are opened, moving die insert 1 is parted from moving plate 4 and slanting slide block 3 slides up along guide pin 5 to finish core drawing under influence of spring 6. Core drawing is accomplished in one instant so that the time of opening mould is shortened and the productivity is improved. This kind of core drawing mechanism can be changed to be used for fixed mould core drawing. It has been proved by practice that core drawing mechanisms illustrated above are simple and dependent. We are easy to maintain and the production costs are greatly reduced. But in practice we must check the elasticity of springs from time to time in case they are out of use. Figure 5 1. fixed die insert 2. moving die insert 3. slanting slide block 4. moving die plate 5. guide pin 6. spring 7. blot References 1　馮炳堯等.模具設(shè)計與制造簡明手冊[Ｍ].上海:上海科學技術(shù)出版社，1985 2 塑料模具設(shè)計手冊編寫組.塑料模具設(shè)計手冊[Ｍ].北京:機械工業(yè)出版社，1982 譯文一： 注射模小型抽芯機構(gòu)的設(shè)計 摘要： 介紹了外殼類塑件注射模設(shè)計生產(chǎn)中，行程較短抽芯的幾種簡單、靈巧的抽芯機構(gòu)，可為類似塑件的注射模設(shè)計提供幫助。 關(guān)鍵詞： 注射模 抽芯 滑塊 在塑膠電子產(chǎn)品的生產(chǎn)中，外殼類塑件的批量較大。前殼和后殼一般采用扣位加螺釘?shù)穆?lián)接方式，以使電子產(chǎn)品外觀光滑美觀。一個面殼注射模經(jīng)常是因有多處扣位而需要抽芯。而1副模具中通常是1模幾件。若采用傳統(tǒng)的斜導柱外側(cè)抽芯和斜滑塊內(nèi)側(cè)抽芯，將會使模具結(jié)構(gòu)十分復雜。生產(chǎn)中根據(jù)殼類塑件扣位抽芯行程很短的特點，設(shè)計了如下所述的幾種常用的、簡單靈巧的抽芯結(jié)構(gòu)。 1 簡單的外側(cè)抽芯機構(gòu) 如圖1所示的外側(cè)抽芯機構(gòu)與傳統(tǒng)的斜導柱抽芯機構(gòu)相類似，只是由于抽芯行程很短，故減去斜導柱，只是靠鎖緊楔塊4和型芯滑塊5的斜面配合來完成滑塊的復位和鎖緊。開模時，動定模分開，型芯滑塊5在彈簧6的作用下完成抽芯動作。定位銷釘7起定位作用。型芯滑塊5上加工有T型導軌以保證抽芯運動精度。 圖1 　　外側(cè)抽芯機構(gòu) 1．定模型芯 2．動模型芯 3．定模板 4．鎖緊楔塊 5．型芯滑塊 6．彈簧 　7．定位銷釘 　8．彈簧 　9．動模扳　10．動模固定板 2 簡單的內(nèi)側(cè)抽芯機構(gòu) 傳統(tǒng)的內(nèi)側(cè)抽芯機構(gòu)多采用斜滑塊內(nèi)側(cè)分型抽芯或斜滑桿頂出機構(gòu)。加工復雜，斜滑桿磨擦運動距離長，磨擦機構(gòu)藏于模具中央，難以潤滑，斜滑桿易磨損。圖2所示的斜滑塊內(nèi)側(cè)抽芯機構(gòu)較好地解決了這個問題。合模時，型芯滑塊6在鎖緊楔塊5的作用下復位。開模時型芯滑塊6和鎖緊楔塊5分開，型芯滑塊6在彈簧8的作用下完成抽芯動作。定位銷釘2起定位作用。整個機構(gòu)抽芯動作可靠，加工簡單。 圖2 　　內(nèi)側(cè)抽芯機構(gòu) 1．動模固定板　　2．定位銷釘　　3．動模型芯 　4．定模型芯 5．鎖緊楔塊 　6．型芯滑塊 　7．定模板 　8．彈簧 　9．動模板 圖３　　內(nèi)、外側(cè)同時抽芯的復合機構(gòu) 1．動模型芯　　2．定位銷釘　　3．型芯滑塊　　4．定模型芯 　　5．鎖緊楔塊 6．定模型芯　　7．型芯鑲塊　　8．彈簧　　9．動模型芯 3 內(nèi)、外側(cè)同時抽芯的復合機構(gòu) 對于1模有幾腔不同塑件，而又同時有內(nèi)、外側(cè)抽芯時，可采用如圖 , 所示的復合抽芯機構(gòu)，圖3為合模狀態(tài)。鎖緊楔塊5的斜面和型芯滑塊3的斜面配合，起到使型芯復位和鎖緊的作用。開模時，型芯滑塊3在彈簧8作用下同時完成內(nèi)、外側(cè)的抽芯動作，定位銷釘2起限位作用。為使型芯加工簡單，維修方便，可將型芯部分做成鑲拼結(jié)構(gòu)。 4 簡單的彈簧抽芯機構(gòu) 如圖4所示為一種簡單的定模彈簧抽芯機構(gòu)。開模后，Ａ處分型，滾輪6離開滑動型芯5，5在彈簧4的作用下完成抽芯動作。需要特別指出的是，由于是定模抽芯，故動模型芯2需設(shè)計成延時開模，以避免拉壞塑件，如果是動模抽芯，則將滾輪固定機構(gòu)放在定模來完成抽芯動作。合模時，滾輪壓迫滑動型芯復位并鎖緊，這種抽芯機構(gòu)十分簡單，加工方便，但鎖緊力不大，且需經(jīng)常檢查彈簧的彈性。 圖４　　彈簧抽芯機構(gòu) 1．定模型芯　 2．動模型芯　 3．固定板　 4．彈簧 5．滑動型芯　 6．滾輪　 7．動模板 5 一種簡易的內(nèi)置抽芯機構(gòu) 對于模具空間位置較小的外側(cè)抽芯，可采用如圖5所示的簡易抽芯機構(gòu)。合模時，在定模鑲塊1的作用下，斜滑塊3壓迫彈簧6并復位，兩個導向銷釘5起導向作用。開模時1、7分開，斜滑塊3在彈簧6的作用下，沿導向銷釘5上行完成抽芯。抽芯動作瞬間完成，縮短了開模時間，提高了生產(chǎn)效率。此種抽芯機構(gòu)經(jīng)適當變化也可用于定模抽芯。 圖５ 簡易內(nèi)置抽芯機構(gòu) 1．定模型芯　 2．動模型芯　 3．斜滑塊　 4．彈簧 5．導向銷釘　 6．螺釘　 7．動模板 經(jīng)生產(chǎn)實踐證明，采用了上述幾種抽芯機構(gòu)的模具，結(jié)構(gòu)簡單，動作運行可靠，維修調(diào)試方便，有效降低了生產(chǎn)成本。 參考文獻 1　馮炳堯等.模具設(shè)計與制造簡明手冊.上海:上?？茖W技術(shù)出版社，1985. 2 塑料模具設(shè)計手冊編寫組.塑料模具設(shè)計手冊.北京:機械工業(yè)出版社，1982.