Some plastic self sealing bags get a blind hole after forming, and then drill through. This method is suitable for thin and deep holes, which can prevent the core from deforming during forming. Plastic products have no holes after forming, and then the holes will be processed again. The latter two knife methods are limited to a few easy cutting materials, such as nylon. At the same time, it needs secondary processing. The production efficiency is low, and it is difficult to guarantee the quality of fine holes, so it is rarely used. This section mainly introduces the design principle and processing method of holes directly generated during forming.

對(duì)在成型時(shí)直接生成的孔，無(wú)論伺種類型，均應(yīng)設(shè)置在不易削弱制品強(qiáng)度的部位，且孔的形狀應(yīng)力求不使模具制造工藝復(fù)雜化。是在成型的制品殘留熔接痕和削弱強(qiáng)度的重要因素。周?chē)O(shè)一個(gè)凸邊來(lái)加強(qiáng)。同時(shí)，孔與孔的間距及幾到制品邊緣的距離也要適當(dāng)。所示的尺寸關(guān)系確定，當(dāng)兩個(gè)孔不一“樣大小時(shí)，按小7L取值；熱塑性塑料自封袋的注塑制品按表2—7中數(shù)值的75％取恒。對(duì)于孔的深度，不同類型的孔的深度因成型方法的不同而不同。通孔注塑制品L的通扎用得很多，成型通孔用的型芯一般有以門(mén)L種安裝辦法。

For the holes directly generated during forming, regardless of the type, they should be set at the parts that are not easy to weaken the strength of the products, and the shape of the holes should strive not to complicate the mold manufacturing process. It is an important factor for residual weld lines and weakening strength of formed products. Set a convex edge around to strengthen. At the same time, the distance between holes and the edge of the product should also be appropriate. The dimension relationship shown is determined. When two holes are different in size, the value is taken as 7L smaller; the injection molded products of thermoplastic self sealing bags are taken as 75% of the values in table 2-7. For the depth of holes, the depth of different types of holes varies with different molding methods. Through hole injection molded products L are used a lot, and the cores used for forming through holes generally have l installation methods.

內(nèi)一端固定的型芯來(lái)成型，且易生成飛邊，當(dāng)型芯較細(xì)時(shí)易彎曲。這種固定型芯的方法不能成型深孔。由兩個(gè)兩端固定的則芯來(lái)成型，由于將一個(gè)型芯設(shè)計(jì)得比另一個(gè)大o．5—1mm左右，保證孔的同心度，不于引起安裝和使用土的困難，而且增加了型芯的穩(wěn)定性，孔的精度低。由一端固定，一端導(dǎo)向支撐的型芯來(lái)成型，這樣型芯有較好的強(qiáng)度和剛度，又能保證同心度，但導(dǎo)向部分易因?qū)蛘`差磨損而產(chǎn)生圓弧溢料。以上無(wú)論采用何種固定方法，孔的深度均不能太大，公則型芯會(huì)彎曲。通常九探隨塑料流動(dòng)性的4(同而不同，流動(dòng)性好的塑料自封袋的7L的深度可以達(dá)到10倍孔徑，流動(dòng)性中等的不能超過(guò)7倍孔徑，而流動(dòng)性差的塑料制品的孔深小于4倍7L徑；否則只能采取機(jī)械加工的力法獲得。

It is easy to produce flash and bend when the core is thin. This method of fixing the core cannot form deep holes. It is formed by two cores fixed at both ends. Because one core is designed to be about 0.5-1mm larger than the other, the concentricity of the hole is guaranteed, which will not cause difficulties in installation and use of soil, but also increase the stability of the core, and the accuracy of the hole is low. It is formed by the core with one end fixed and one end guided and supported, so that the core has better strength and stiffness and can ensure concentricity, but the guide part is easy to produce arc overflow due to the wear of guide error. No matter what fixing method is adopted above, the depth of the hole should not be too large, and the core will be bent. Generally, the depth of 7L of plastic self sealing bag with good fluidity can reach 10 times the aperture, and that of plastic products with medium fluidity can not exceed 7 times the aperture, while that of plastic products with poor fluidity is less than 4 times the 7L diameter; otherwise, it can only be obtained by mechanical processing.

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