·塑料注射模技术，
三通接头脱螺孔及相交型孔时差抽芯注射模设计
文根保"，文莉'，史文？
1.中航工业航宇教生装备有限公司（湖北襄阳441002）
2.澳大利亚悉尼大学(澳大利亚尼)
【摘要]三通接头是一种具有多种型孔、型槽、维孔，外螺纹和螺孔，且有两种正交维孔相贯穿的塑件。通过正确地选择了三通接头在模具中竖直摆放的位置，采用了斜滑块抽芯机构和链轮与链条脱螺孔机构，以及具有时间差的两种正交锥孔抽芯机构。实现了成型三通接头外形和外螺纹的成型加工；实现了对多种型孔、型槽、锥孔的抽芯和复位，螺孔的脱模（兼三通接头的脱模；规避了两种正交贯穿维孔抽芯运动干涉的现象。通过该案例的实施，说明了只要认真进行塑件的形体“六要素"和注射模结构方案的分析，并能够找到正确模具各种
执行的机构和构件，才能确保注射模设计的正确，从而实现望件的顺利成型加工。关键调：外螺纹；螺孔；抽芯结构；脱螺孔；运动干涉
中图分类号：TQ320.66
文献标识码：B
Designof InjectionMoldWithScrewHolesCore-Pulling
for the Tee Joint and Intersection Type Hole
[Abstract] Tee joint is a kind of has many holes, slots, cone hole, the male and the screw hole, and there are two kinds of orthogonal cone hole through plastics parts. Through properly choose the tee joint in the mold location of the vertical, technoloy core-pulling mechanism is adopted and the sprocket and chain institutions to take off the screw hole, and a time lag of two orthogonal cone hole core-pulling mechanism. Implements the molding tee joint shape and external thread molding;: Realized with multiple holes, slots, taper hole core-pulling and reset the screw hole stripping (and tee joint demoulding); Avoid the two orthogonal throughout the taper hole core pulling movement interference phenomenon. As long as is illustrated by the implementation of the case, a serious form of molded parts "six elements" and the analysis of the injection mold structure scheme, all kinds of mold and to find the correct execution of institutions and artifacts that can ensure that the correct design of injection molds, so as to realize the smooth processing of plastics parts.
Key words: external thread; screw hole; core-pulling structure; to take off the screw hole; movement interference
1引言
三通接头的材料是30%玻纤聚碳酸酯，其是以聚碳酸酯为基料，玻璃纤维为增强体制得的复合材料，简称PC/GF。PC/GF是一种热塑性树脂，无毒、无臭、无色至淡黄色透明的固体。其种类很多，最具实用价值的是双酚A(4,4-二羟基二苯基丙烷)型聚碳酸酯、
· 46 · 万方数据
玻璃化温度149℃，密度约1.2。结晶熔点220℃~ 230℃。溶于二氯甲烷和对二恶烷，稍溶于芳烃和酮等。耐盐类、酸类、脂肪烃类溶剂，但不耐碱,在甲醇中溶胀。有优异的冲击韧性，是最好的工程塑料之一。具有优良的高温电性能，耐燃自熄性。拉伸强度 >60MPa，伸长率>60%，弯曲强度>95MPa。介电
《模具制造》2017年第2期