【正文】 天津職業(yè)技術(shù)師范大學(xué)2012屆本科生畢業(yè)設(shè)計參考文獻 [1] 黃虹．塑料成型加工與模具．北京：化學(xué)工業(yè)出版社，2002. [2] 王孝培．塑料成型工藝及模具簡明手冊．北京：機械工業(yè)出版社，2006.[3] 《塑料模設(shè)計手冊》編寫組．模具手冊之二：塑料模設(shè)計手冊．北京：機械工業(yè)出版社，1982.[4] 模具實用技術(shù)叢書編委會．塑料模具設(shè)計制造與應(yīng)用實例．北京：機械工業(yè)出版社，2002.[5] 王文廣，田寶善，田雁晨．塑料注射模具設(shè)計技巧與實例．北京：化學(xué)工業(yè)出版社，2003.[6] 中國機械工程學(xué)會：中國模具設(shè)計大典編委會．中國模具設(shè)計大典數(shù)據(jù)庫存．2003.[7] 海欽，向俞，劉松林，侯慶元，尹松君．中國工業(yè)材料大典．上卷．黑色金屬．上海：科學(xué)技術(shù)文獻出版社，1999.[8] 王巍．機械制圖．北京：高等教育出版社，2003.[9] 甘永立．幾何量公差與檢測．6版．上海：上海科學(xué)技術(shù)出版社，2004.[10] 洪慎章．實用注塑成型及模具設(shè)計．北京：機械工業(yè)出版社，2006.[11] ：西北工業(yè)大學(xué)出版社，1988.天津職業(yè)技術(shù)師范大學(xué)2012屆本科生畢業(yè)設(shè)計附錄：外文翻譯英文資料Examples 15Core lifters on the core . The molded part can now shrink freely and bees smaller than the crosssection of the core. The cylinders then push the cavity frame toward the core . The rim of the molded pan which is nowsmaller pushes against the core lifters or core in which case the core lifters if present are pushed back external slides located in the cavity frame do not follow the axial movement of the frame until they are far enough apart to release the external contour of the molded pan.The molded pan can now drop free.Stack MoldIf this ejection principle is employed with a stack mold the reduced opening stroke can be used twice.A twocavity stack mold is shown in Figs. 5 to 7. The bottom surfaces of the molded parts face one another at the center of the mold. Melt reaches the hot runner manifold at the center of the mold via an extended shutoff nozzle that extends through a core and an opening in the bottom of crate. Each crate is gated along the bottom at four locations. The opening motion of the mold is controlled by means of racks and pinions . The mold has dimensions of 813 mm x 813 mm with a height of 864 mm (crate height: 280 mm). The opening stroke is 660 mm. The maximum open daylight required in the molding machine is thus 1524 mmExamples 20The housing is relatively plicated in design and must furthermore be molded with high dimensional accuracy. Four mounting holes are positioned around the outer edge and together with the sealing lip around the edge arc ribbed to improve rigidity. Two rounded partitions are located inside the housing, the larger of which is slotted on the sides. In addition, the side of the housing has a rectangular opening with a lip for welding the merial be used is polypropylene.The twocavity mold is shown in 1 to 7 and has two slides that form the rectangular openings in the side of the housings by means of the side cores (b) and an interconnecting opening between the curved partitions by a cylindrical core pin . The inside surface faces the injection side and is formed primarily by the core insert , which is held against the core plate by the core retainer plate . Inserts and arc used to form the curved partitions and are held against the clamping plate by the insert retainer plate . The outside of the housing faces the ejector side and is formed by the cavity insert . The parts are molded via a sprue and a conventional runner system in the main parting line II and are edgegated. It should be noted above all that, because of the sealing lip around the edge, the slide must pass through the cavity insert on the movable side. The resulting bridge is designed as a separate ponent and is screwed to the insert .The mold uses three cooling circuits.Cooling Circuit AThis circuit consists of the channels in the movable side cavity inserts and is reached via extension tubes.Cooling Circuit BThis circuit is located in the stationaryside core inserts and consists of several channels.Cooling Circuit CThe inserts and used to form the curved partitions are cooled by channels with baffles . The cooling medium is supplied through channels in the clamping plate .The mold first opens at parting line since the latch holds plates and together. In this manner, the curved partitions are released first while the mold is closed (main parting line. This measure is necessary because the wall thickness of the partitions and their shape do not permit the use of sleeve ejectors. After the curved partitions have been released, the latch is disengaged and permits the mold to open at the main parting line I I. To facilitate the opening motion of the four spring loaded rods providing a force of 1000 N each act on the core retainer plate . The slides are actuated by the cam pins and release the molded pans after a stroke of 50 mm. The upper slide is held by a spring catch which is actuated by a rod . The molded parts are ejected by a number of ejector pins and ejector sleeves .The ejector sleeves act at the mounting holes. Mold plates and move along the guide pin and are held by the stop bolt after being unlatched. Stop bolt must Examples 22The pump housing .mil the pump piston are rotationally symmetrical parts with various external undercuts and Lateral perforations the molding material is polyacetal Due to the similarity of both parts a mold has been constructed in which the piston and the pump housing can be produced simultaneously the outer surfaces of the molded parts are formed exclusively by a split it arrangement consisting of the cavity insert retainers and the it inserts When damaged. only the inserts have to he replaced various later forations are molded core inserts housed in the cavity inserts. Due to the height of the split cavity arrangement and to achieve a large supporting crosssection for the taper lock if the cam pins have been mounted outside lie taper lock area. I he split cavity halves are guided by the stripper plate A cylinder secured on one side of the splitcavity parting line additionally serves to locate the spin cavity half The runner and the center gate lot the molded parts are also located in the splitcavity parting line. the inner surfaces the molded parts are formed the cores held in the core retainer plate . they ate secured against rotating by pins, because of their liability to damage the core tips are screwed in and are thus replaceable. The