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1、畢業(yè)論文任務(wù)書題目：塑料蓋注射模設(shè)計起止時間：2011年4月——2011年5月學(xué)生姓名：學(xué)號：0841002551班級：08模具5班專業(yè)（全稱）：模具設(shè)計與制造指導(dǎo)老師：2011年6月11日目錄1.塑件的工藝性分析1.1制件的產(chǎn)品圖···································31.2尺寸及精度·····································31.3表面粗糙度····································41.4脫模斜度····························
2、··········41.5塑件壁厚······································41.6圓角··········································51.7收縮率········································52.塑件的材料選擇2.1制件的材料選擇································63.注射機(jī)的選擇及型腔數(shù)的確定3.1注射機(jī)的選擇··································73.2型腔數(shù)的確定······
3、····························94.澆注的系統(tǒng)的設(shè)置4.1主流道的設(shè)計··································114.2分流道的設(shè)計··································124.3澆口的設(shè)計····································124.4冷料穴的設(shè)計··································145.成型零部件的設(shè)計5.1凹模設(shè)計·····································165.
4、2型芯的設(shè)計····································165.3成型零部件工作尺寸的計算······················176.合模導(dǎo)向機(jī)構(gòu)的設(shè)置6.1導(dǎo)柱··········································206.2導(dǎo)套··········································216.3導(dǎo)柱導(dǎo)套的配用································227.推出機(jī)構(gòu)和復(fù)位零件的設(shè)計7.1推桿推板的設(shè)計··················
5、·············247.2復(fù)位零件的設(shè)計·······························248.溫度調(diào)節(jié)系統(tǒng)及排氣系統(tǒng)的設(shè)計8.1溫度調(diào)節(jié)系統(tǒng)的設(shè)計·······268.2排氣系統(tǒng)的設(shè)計·········279.試模與修模9.1裝模··············279.2試?！ぁぁぁぁぁぁぁぁぁぁぁぁぁ?91.塑件的工藝性分析1.1制件的產(chǎn)品圖1.2尺寸及精度塑件尺寸在這里指的是塑件的總體尺寸，而不是壁厚、孔徑等結(jié)構(gòu)尺寸。塑件尺寸大小與塑件流動性有關(guān)。塑件的尺寸精度是指所獲得的塑件尺寸與產(chǎn)品的設(shè)計尺寸的符合程度，即所獲塑件尺寸的
6、準(zhǔn)確度。影響塑件尺寸精度的因素很多，首先是模具的制造精度的磨損程度，其次是塑料收縮率的波動以及成型時工藝條件的變化，塑件成型后的時效變化和模具的結(jié)構(gòu)形狀等。因此，塑件的尺寸精度往往不高，應(yīng)在保證使用要求的前提下盡可能選用低精度等級。根據(jù)定義圖紙的要求公差為自由公差，結(jié)合塑料制件公差數(shù)值標(biāo)準(zhǔn)SJ1372-78，4級，即一般精度標(biāo)準(zhǔn)。1.3表面粗糙度塑件的外觀要求越高，表面粗糙度值應(yīng)越低。成型時要盡可能從工藝上避免冷疤、云紋等缺陷產(chǎn)生，除此之外，塑件的外觀主要取決于模具型腔表面粗糙度。一般，模具型腔表面粗糙度值要比塑件的要求低1~2級。模具在使用過程中，
7、由于型腔磨損而使表面粗糙度值不斷加大，所以應(yīng)隨時予以拋光復(fù)原。透明塑件要求型腔和型芯的表面粗糙度相同，而不透明塑件則根據(jù)使用情況決定。由于此產(chǎn)品外觀要求高，塑件表面粗糙度值定為Ra1.25mm。1.4脫模斜度塑件冷卻時的收縮會使它包緊住模具型芯或型腔中凸起的部分，因此為方便制件從型芯后從型腔中取出，必須設(shè)計一定的脫模斜度，根據(jù)常用的塑件脫模斜度表查詢得，型腔的脫模斜度為30＇，型芯的脫模斜度為30′。1.5塑件壁厚塑件制品應(yīng)該有一定的壁厚，這不僅是為了塑件制品本身在使用中有足塑件壁厚受使用要求、塑料材料性能、塑件幾何尺寸以及成型工藝等眾多因素的制約，
8、根據(jù)成型工藝的要求，應(yīng)盡量使制件各部分壁厚均勻，避免有的部分太后或者太薄，否則成型后會因收縮不均勻而使制品變
