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. 抽芯机构在注射模设计中的应用英文文献和中文翻译(2):http://www.751com.cn/fanyi/lunwen_8695.html