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slide 2. fixed block 3. locking block 4. angle pin 5. Wear plate 6. positioning screw 7.wear plate 8. slide wedge 9. spring rod
Figure 3. Angle pin core-pulling mechanism
III. DESIGN OF ANGLE EJECTOR ROD CORE-PULLING、MECHANISMS
Four angle ejector rod core-pulling mechanisms are designed in the area of D and E of the plastic part 1 and in the area of I and J of the plastic part 2. The mechanisms are distributed in figure 4
Fig.4 Distribution of angle ejector rod core-pulling
Mechanisms
Taking the angle ejector rod core-pulling mechanism 1 shown in figure 4 for example, the mechanism is mostly composed of angle ejector block 1, angle ejector rod 9, angle ejector guide block 4, angle ejector guide block 6, angle pin 5, angle ejector slide 7 and wear plate 8. The mechanism is shown in figure 5.
angle ejector block 2. straight guide bush 3. headed guide bush 4. angle ejector guide block 5. angle pin 6. Angle ejector guide block 7. angle ejector slide 8. wear plate 9. angle ejector rod 10. pin
Figure 5. Angle ejector rod core-pulling mechanism
The angle ejector rod is made of SUJ2 which is premium alloy material and the surface is in nitrogen treatment. The wear resistance of the angle ejector rod is well. By analyzing and computing, the Inclined angle of the angle ejector rod is 20°which ensures the realization of the core-pulling and the better power distribution. The angle ejector guide block is made of nickel bronze and is fixed in the core plate. The mould is easily maintained and the precision of the angle ejector rod is ensured by using the angle ejector guide block. The angle ejector rod is fixed in the angle ejector slide which moves along the slide way of the ejector retainer plate. When the mould is opened, the angle ejector rod moves with the ejector retainer plate. The angle ejector block moves ahead with the angle ejector rod and moves in the side direction. So the core-pulling is achieved. The angle ejector block returns to its original position in virtue of the angle ejector rod which is driven by the ejector retainer plate.
IV. OVERALL STRUCTURE AND WORKING PROCESS OF THE INJECTION MOULD
The mould structure is shown in figure 6. The layout of two cavities in one mould and side gate are adopted. The ten core-pulling mechanisms shown in figure 6 is reasonably designed and compact in terms of structure.
The whole working process of the mould is as follow: The melt plastic flows into the cavity of the mould through the feed system and the mould is opened after full packing and cooling. The moving plate of the injection machine moves back together with the moving half of the injection mould and the mould opened between the parting face of the mould. The plastic parts are pulled from the cavities of mould and stay with the moving half of the mould. The angle pins fixed in the cavity plate guide the six slides in the moving half of the mould to finish core-pulling. When the mould is opened for a fixed distance, the moving half of the mould stops moving back. The ejector rods of the injection machine move ahead and push forward the ejector plate of the mould with the ejector rods, angle ejector rods. Then the plastic parts are pushed out of the injection mould and corepulling is accomplished during the ejecting. When ejector rods of the injection machine move just for 120mm, the ejector mechanism stops moving and the plastic parts are taken out. The action of demoulding is completed. When the mould is closed, the ejector rods of the injection machine move back. The mould components return to their original position in virtue of the return pins and the angle pins. The second working cycle begins after the mould is closed.
V. CONCLUSION
The mould structure is complicated. Ten core-pulling mechanisms are designed reasonably in one mould and demoulding of the plastic parts is realized. Many inserts and standard parts are used in the injection mould, so the economical efficiency of the injection mould is well and the injection mould can be maintained conveniently. The injection mould is already in mass production. Industrial practice proves that the action of the core-pulling mechanisms, ejector mechanisms and resetting mechanisms is stable and reliable. The plastic parts produced can meet the customers’ technical requirements.