M428862 五、新型說明： 【新型所屬之技術領域】 本創作涉及模具技術領域’特別是涉及一種環狀進勝預切 斷結構。 【先前技術】 按’隨著科學技術的不斷發展進步’塑膠製品被廣泛應用 於各式各樣的商品中’例如產品的電腦、手機、汽車、數碼相 機、遊戲機等。上述塑膠製品往往通過注塑模具來加工成型， 不同的模具由不同的零件構成，主要通過所成型材料物理狀態 的改變來實現物品外形的加工。傳統的模具包括相互配合的公 模和母模，公模和母模圍成型腔，工作時，注塑機熱機嘴向注 塑模具中注入炼化狀態的塑膠，熔化狀態的塑膠沿注塑模具的 流道進入型腔内，經過冷卻、開模、頂出等操作，完成塑膠製 品的成型。 惟，上述模具在冷卻脫模之時，還要進行人工剪流道和產 品分離之工序才能獲得產品，產生了不必要之材料浪費，提高 了生產成本》 【新型内容】 本創作之目的在於克服上述現有技術中的不足，提供一種 環狀進膠預切斷結構。 本創作提供一種環狀進膠預切斷結構，包括相互配合的上 模和下模及設於下模内切斷沖針、限定塊和推針。合模時上模 和下模圍成型腔’上模内設有與型腔連通的流道。切斷沖針下 端可滑動的限位於下模内，上端穿過型腔而伸入流道内。限定 塊安裝在下模内，推針可上下活動的設置於下模内之限定塊 M428862 内。作動時，推針推抵切斷沖針向上滑動使切斷沖針上端封閉 流道與型腔的環形縫隙。 綜上所述，本創作環狀進膠預切斷結構在熔熔塑膠未冷卻 之前，藉由推針推抵切斷沖針向上滑動使切斷沖針上端之針部 封閉流道與型腔的環形縫隙，切斷流道内與型腔内塑膠的連 接，從而減少了剪斷工序，同時節省了流道内塑膠之浪費，結 構簡單，性能好，節約製造成本。 【實施方式】 為詳細說明本創作之技術内容、構造特徵、所達成目的及 功效，以下茲舉例並配合圖式詳予說明。 請參閱第一圖及第二圖，本創作環狀進膠預切斷結構100 用於成型具有圓孔201的產品200,包括相互配合的上模10、 下模20以及設於下模20内部之切斷沖針30、限定塊40及推 針50。合模時上模10和下模20圍成型腔60，上模10内設有 與型腔連通的流道11。切斷沖針30下端可滑動的限位於下模 20内，上端穿過型腔60而伸入流道11内。推針50可上下活 動的設置於下模20内之限定塊40内，用於推抵切斷沖針30 做上下滑動。作動時，推針5 0推抵切斷沖針3 0向上滑動使切 斷沖針30上端封閉流道11與型腔60的環形縫隙（圖中未標 示）。 具體地，下模20上設有滑槽21，滑槽21的下端設有與 滑槽21連通的限位槽22。下模20上還設有與限位槽22連通 的安裝槽23。一限定塊40固定安裝於安裝槽23内，從而將 切斷沖針30限位於滑槽21及限位槽22内。切斷沖針30包括 主體部31、主體部31上端凸伸出的針部32及主體部31下端 向外擴伸形成的卡部33。卡部33卡設於限位槽22内，主體M428862 V. New description: [New technical field] This creation involves the field of mold technology, especially involving a ring-shaped pre-cut structure. [Prior Art] According to the continuous development of science and technology, plastic products are widely used in a wide variety of products, such as computers, mobile phones, automobiles, digital cameras, game consoles, and the like. The above plastic products are often processed by injection molding. Different molds are composed of different parts, and the shape of the articles is processed mainly by the change of the physical state of the formed materials. The conventional mold includes a male mold and a female mold which are matched with each other. The male mold and the female mold surround the molding cavity. When working, the hot melt nozzle of the injection molding machine injects the plastic in the refining state into the injection mold, and the plastic in the molten state flows along the flow path of the injection mold. Into the cavity, through the cooling, mold opening, ejection and other operations to complete the molding of plastic products. However, when the mold is cooled and demolded, the process of artificial shear flow and product separation is required to obtain the product, resulting in unnecessary material waste and increased production cost. [New content] The purpose of this creation is to overcome In the above-mentioned deficiencies in the prior art, an annular feed pre-cut structure is provided. The present invention provides an annular feed pre-cutting structure comprising an upper mold and a lower mold which are matched with each other, and a cutting needle, a restricting block and a push pin which are arranged in the lower mold. When the mold is closed, the upper mold and the lower mold surround the molding cavity. The upper mold is provided with a flow passage communicating with the cavity. The slidable limit of the lower end of the punching needle is located in the lower mold, and the upper end passes through the cavity and protrudes into the flow path. The limiting block is mounted in the lower mold, and the push pin is movable up and down in the limiting block M428862 in the lower mold. When actuating, push the needle to push the cutting needle upward to slide the upper end of the cutting needle to close the annular gap between the flow path and the cavity. In summary, the artificial ring-cutting pre-cutting structure of the present invention is used to push the needle to push the needle upward by sliding the needle before the molten plastic is cooled, so that the needle at the upper end of the cutting needle closes the flow path and the cavity. The annular gap cuts off the connection between the plastic channel and the plastic in the cavity, thereby reducing the cutting process, saving the waste of plastic in the flow channel, simple structure, good performance and saving manufacturing cost. [Embodiment] In order to explain in detail the technical contents, structural features, achieved goals and effects of the present invention, the following is a detailed description with reference to the drawings. Referring to the first and second figures, the inventive annular feed pre-cutting structure 100 is used for molding a product 200 having a circular hole 201, including an upper mold 10, a lower mold 20, and a lower mold 20. The punching needle 30, the restricting block 40, and the push pin 50 are cut. The upper mold 10 and the lower mold 20 surround the molding cavity 60 when the mold is closed, and the upper mold 10 is provided with a flow path 11 communicating with the cavity. The lower limit of the lower end of the punching needle 30 is located in the lower mold 20, and the upper end passes through the cavity 60 and projects into the flow path 11. The push pin 50 is movable up and down in the defining block 40 in the lower mold 20 for pushing up and down the punching needle 30 to slide up and down. When actuated, the push pin 50 pushes against the cut punch 3 to slide upward so that the upper end of the cut punch 30 closes the annular gap of the flow path 11 and the cavity 60 (not shown). Specifically, the lower mold 20 is provided with a chute 21, and the lower end of the chute 21 is provided with a limiting groove 22 communicating with the chute 21. The lower mold 20 is further provided with a mounting groove 23 communicating with the limiting groove 22. A limiting block 40 is fixedly mounted in the mounting groove 23 to limit the cutting needle 30 to the chute 21 and the limiting groove 22. The cutting needle 30 includes a main body portion 31, a needle portion 32 projecting from the upper end of the main body portion 31, and a card portion 33 formed by expanding the lower end of the main body portion 31 outward. The card portion 33 is locked in the limiting slot 22, and the main body
S 4 M428862 部31滑設於滑槽21内，針部32穿過型腔60而伸入流道11 内。 請參閱第二圖至第五圖，對本創作環狀進膠預切斷結構 100的環狀進膠預切斷過程進行說明：合模時，上模10、下模 20相互配合圍成型腔60，推針50還未頂入限位槽22内，切 斷沖針30處於限位槽22内下端，針切斷沖針30之針部32與 流道11之間形成所述環形缝隙；注塑時，熔熔塑膠通過流道 11及環形縫隙（圖中未標示）注入型腔60内。當熔熔塑膠注 滿型腔60之後，推針50頂入限位槽22，同時推抵切斷沖針 30之卡部33向上滑動使切斷沖針30上端之針部32封閉流道 11與型腔60的環形縫隙，待熔熔塑膠冷卻成型後再進行開模 獲得具有圓孔201的產品200。 另外，切斷沖針30之主體部31外側周圈套設有密封膠 310，起密封作用，防止上下氣流相通，從而使得熔融塑膠不 會從切斷沖針30與下模20之間之縫隙往下流出。The S 4 M428862 portion 31 is slidably disposed in the chute 21, and the needle portion 32 passes through the cavity 60 and projects into the flow passage 11. Referring to the second to fifth figures, the annular pre-cutting process of the annular feed pre-cutting structure 100 of the present invention will be described: when the mold is closed, the upper mold 10 and the lower mold 20 cooperate with each other to form the cavity 60. The push pin 50 has not yet entered the limit groove 22, and the cut punch 30 is located at the lower end of the limit groove 22, and the annular gap is formed between the needle portion 32 of the needle cutting punch 30 and the flow path 11; At the time, the molten plastic is injected into the cavity 60 through the flow path 11 and the annular gap (not shown). After the molten plastic is filled into the cavity 60, the push pin 50 is pushed into the limiting groove 22, and the card portion 33 pushed against the cutting punch 30 is slid upward so that the needle portion 32 at the upper end of the cutting punch 30 closes the flow path 11 And the annular gap of the cavity 60, after the molten plastic is cooled and formed, the mold is opened to obtain the product 200 having the round hole 201. In addition, the outer peripheral portion of the main body portion 31 of the cutting punch 30 is provided with a sealant 310 to seal the gap to prevent the upper and lower airflow from communicating, so that the molten plastic does not cut from the gap between the punching needle 30 and the lower die 20. Flow out.
綜上所述，本創作環狀進膠預切斷結構在熔融塑膠未冷卻 之前，藉由推針50推抵切斷沖針30向上滑動使切斷沖針30 上端之針部32封閉流道11與型腔60的環形縫隙，切斷流道 11内與型腔60内塑膠的連接，從而減少了剪斷工序，同時節 省了流道11内塑膠之浪費，結構簡單，性能好，節約製造成 本。 【圖式簡單說明】 第一圖係本創作環狀進膠預切斷結構之較佳實施例的立 體分解圖。 第二圖係第一圖所示環狀進膠預切斷結構的注塑前之剖 面圖。 M428862 第三圖係第一圖所示環狀進膠預切斷結構的注塑後之剖 面圖。 第四圖係第二圖所示環狀進膠預切斷結構的注塑前之切 斷沖針狀態局部放大圖。 第五圖係第三圖所示環狀進膠預切斷結構的注塑後之切 斷沖針狀態局部放大圖。 【主要元件符號說明】 環狀進膠預切斷結構 100 上模 10 產品 200 下模 20 限位槽 22 切斷沖針 30 密封膠 310 卡部 33 推針 50 流道 11 圓孑L 201 滑槽 21 安裝槽 23 主體部 31 針部 32 限定塊 40 型腔 60In summary, the artificial ring-shaped pre-cutting structure of the present invention is used to push the needle 50 to slide upward by the push pin 50 before the molten plastic is cooled, so that the needle portion 32 at the upper end of the cutting needle 30 closes the flow path. 11 and the annular gap of the cavity 60, cut off the connection between the plastic material in the flow channel 11 and the cavity 60, thereby reducing the cutting process, and saving the waste of the plastic in the flow channel 11, the structure is simple, the performance is good, and the manufacturing is saved. cost. BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a perspective view of a preferred embodiment of the preferred embodiment of the annular feed pre-cut structure. The second drawing is a cross-sectional view of the annular feed pre-cut structure shown in the first figure before injection molding. M428862 The third figure is a cross-sectional view of the annular feed pre-cut structure shown in the first figure after injection molding. The fourth figure is a partially enlarged view of the state of the cutting needle before the injection molding of the annular feed pre-cut structure shown in the second figure. The fifth figure is a partially enlarged view of the state of the cut needle after the injection molding of the annular feed pre-cut structure shown in the third figure. [Main component symbol description] Ring feed pre-cut structure 100 Upper mold 10 Product 200 Lower mold 20 Limit groove 22 Cut punch 30 Sealant 310 Card portion 33 Push pin 50 Flow path 11 Round 孑 L 201 Chute 21 mounting groove 23 body portion 31 needle portion 32 defining block 40 cavity 60