注塑模具设计(外文翻译).doc
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注塑模具设计(外文翻译),the injection mold--the design of runner1.the basicthe runner is a channel machined into the mod plate to connect the sprue with the entrance(gate) to the impre...
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The Injection Mold
--The design of Runner
1.The basic
The runner is a channel machined into the mod plate to connect the sprue with the entrance(gate) to the impression. In the basic two-plate mod the runner is positioned on the surface while on the more complex designs the runner may be positioned below the parting surface
The wall of the runner channel must be smooth to prevent any restriction to flow. Also, as the runner has to be removed with the molding, there must be no machine marks left, which would tend to retain the runner in the mod plate. To ensure that these points are met, it's desirable for the mod designer to specify that the runner(channel) is polished 'in line of draw'.
There are some other considerations for the designer to bear in mind: (i) the shape of the cross section of the runner, (ii) the size of the runner.
Runner cross-section shape The cross-sectional shape of the runner used in a mod is usually one of four forms (Figure 4.2): fully round (a), trapezoidal (b), modified trapezoidal (c) and hexagonal (d). The reason why these particular forms are used in preference to others are outlined below.
注塑模具设计--流道设计
流道基础
流道是在模板上加工出的连接主流道和进入（浇口）型腔的一条沟槽。在两板式基本模具中，流道设置在分型面上而在较复杂的设计中流道也许设置在分型面的下面。
流道的壁必须光滑，防止料流受到阻碍。另外，由于流道废料必须和塑件一起取出，所以流道壁上必须不留下任何加工痕迹，避免流道废料滞留在模板上。为了确保这些要点得到满足，要求模具设计者在图纸中注明这条流道需要沿取出方向抛光。
另外还有一些要求设计者用心考虑的：（1）流道的横截面形状，（2）流道的尺寸和（3）流道的布置。模具中用到的流道横截面形状，通常是四种形式之一（图4.2）：整圆（a），梯形（b）,U型（c），和六角形（d）。为什么采用这些特殊的形状而不采用其他形状的理由说明如下。
流道设计效率的评判标准从压力传递的角度来看流道应该具有最大的横截面积，而从热量传递的角度来看，应该和周边有最小的接触面积。因此横截面积和周长的比率将直接可以指示流道设计的效率。这个值较高时，效率也高。各种类型流道横截面的比率如图4.3所示。可见从这种角度考虑圆形和方形的流道是两种最满意的设计。而半圆和矩形的比率使得它们通常很少使用。
--The design of Runner
1.The basic
The runner is a channel machined into the mod plate to connect the sprue with the entrance(gate) to the impression. In the basic two-plate mod the runner is positioned on the surface while on the more complex designs the runner may be positioned below the parting surface
The wall of the runner channel must be smooth to prevent any restriction to flow. Also, as the runner has to be removed with the molding, there must be no machine marks left, which would tend to retain the runner in the mod plate. To ensure that these points are met, it's desirable for the mod designer to specify that the runner(channel) is polished 'in line of draw'.
There are some other considerations for the designer to bear in mind: (i) the shape of the cross section of the runner, (ii) the size of the runner.
Runner cross-section shape The cross-sectional shape of the runner used in a mod is usually one of four forms (Figure 4.2): fully round (a), trapezoidal (b), modified trapezoidal (c) and hexagonal (d). The reason why these particular forms are used in preference to others are outlined below.
注塑模具设计--流道设计
流道基础
流道是在模板上加工出的连接主流道和进入（浇口）型腔的一条沟槽。在两板式基本模具中，流道设置在分型面上而在较复杂的设计中流道也许设置在分型面的下面。
流道的壁必须光滑，防止料流受到阻碍。另外，由于流道废料必须和塑件一起取出，所以流道壁上必须不留下任何加工痕迹，避免流道废料滞留在模板上。为了确保这些要点得到满足，要求模具设计者在图纸中注明这条流道需要沿取出方向抛光。
另外还有一些要求设计者用心考虑的：（1）流道的横截面形状，（2）流道的尺寸和（3）流道的布置。模具中用到的流道横截面形状，通常是四种形式之一（图4.2）：整圆（a），梯形（b）,U型（c），和六角形（d）。为什么采用这些特殊的形状而不采用其他形状的理由说明如下。
流道设计效率的评判标准从压力传递的角度来看流道应该具有最大的横截面积，而从热量传递的角度来看，应该和周边有最小的接触面积。因此横截面积和周长的比率将直接可以指示流道设计的效率。这个值较高时，效率也高。各种类型流道横截面的比率如图4.3所示。可见从这种角度考虑圆形和方形的流道是两种最满意的设计。而半圆和矩形的比率使得它们通常很少使用。
