医用吸盘注射模结构的设计

Structure design of injection mold for medical sucker

通过对医用吸盘形体分析,找出了医用吸盘形体上存在2个三角形型孔和8×Φ2 mm×30 mm型孔要素。成型这2种型孔型芯相互垂直贯穿,如同时进行抽芯运动便产生了干涉。为了提高加工效率,注射模采用了一模二腔的三模板结构形式。对于成型2种型孔型芯无疑是要采用抽芯机构进行,为了避免出现抽芯运动干涉的方法是要进行相互避让另一种抽芯运动。即成型8×Φ2 mm×30 mm型孔型芯应先于成型三角形型孔型芯进行抽芯,后于成型三角形型孔型芯进行复位。若采用机械方式进行避让,其结构非常复杂。而采用油缸抽芯机构进行4处三角形型孔的抽芯,2腔8×Φ2 mm×30 mm型孔的抽芯则采用斜导柱滑块抽芯机构。通过计算机或单板机的编程,只是要能控制2种抽芯运动的程序:即8×Φ2 mm×30 mm型孔的型芯先抽芯→三角形的型孔型芯后抽芯→三角形的型孔型芯先复位→8×Φ2 mm×30 mm型孔的型芯后复位就可以了,这样注射模便能顺利地进行医用吸盘的抽芯和脱模。

Through the analysis of the shape of medical sucker,it is found that there are two triangular holes and 8×Φ2 mm×30 mm holes in the shape of medical sucker.The cores of the two kinds of holes are perpendicular to each other,and interference occurs when core pulling is carried out.In order to improve the machining efficiency,the injection mold adopts three-mold structure with one mold and two cavities.For forming the two kinds of holes,the core pulling mechanism is no doubt to be used.In order to avoid the interference of core pulling movement,the method is to avoid each other.Namely the core pulling of 8×Φ2 mm×30 mm holes should be carried out before the triangular hole core,and reset after forming the triangular hole core.If the mechanical way is used to avoid,its structure is very complex.The core pulling mechanism of oil cylinder is used for core pulling with 4 triangular holes,and the core pulling of two cavities of 8×Φ2 mm×30 mm holes is inclined guide pillar slider core pulling mechanism.Through the programming of computer or single board computer,it is only necessary to be able to control two kinds of core pulling movement:That is cores of 8×Φ2 mm×30 mm holes are pulled out first→cores of triangular holes are pulled out later→cores of triangular holes are reset first→cores of 8×Φ2 mm×30 mm holes are reset later.In this way,the core pulling and demoulding of the medical sucker can be carried out smoothly.