with this phenomena must be incorre

with this phenomena must be incorrect. In fact, rough calculations (based on the
assumption that the increase in flow stress must be due to stain-rate effects) indicate that shearing at the interface must occur over a distance of about 40-60 /lm.
The difficulty of extrusion is thus defined by the A 2 parameter and is, for example, a useful method of judging the difficulty of extrusion of a new order.
Moreover, there is considerable further evidence that this method can be justified
[39-42]. We should note, however, that using a value ofAwould not substantially
alter the regression analysis since the effect of squaring the parameter only alters
the regression constants and not the equation fit.
Thus far we have considered only the extrusion of rods and simple shapes; a
small proportion of the output from aluminium alloys. There is little in the literature concerning the extrusion of multiholes or extrusion using bridge or porthole
dies. Castle [38] reported experiments concerning the extrusion of shapes as well
as extrusion through multihole dies. Unfortunately the work was performed some
years ago and the treatment of the data can be improved. The author has used this
data to show that for multihole extrusion the correction factor required may be
expressed in terms of the peripheral ratio calculated using all the holes (i.e. for
the extrusion of multiple rounds the ratio is simply ...IN where N is the number of
holes) and the pitch circle diameter such that A' = A(DiDB - Dp) where Dp is the
pitch circle diameter and DB is the billet diameter. Figure 4.13 shows the results
of the analysis and Castle's experimental data.
An estimate of the pressure required to extrude through bridge or porthole dies
may be approached by considering the operation as two separate extrusions.

結果 (中文) 1:

与此现象一定是不正确的。事实上，粗略计算 (基于流动应力的增加必须应变率效应的假设） 表明，在界面剪切必须发生在距离约 40-60 /lm。挤压困难因此由 2 参数定义，例如，是判断挤出一个新秩序的困难的有用方法。此外，还有相当多的进一步证据，可以证明这种方法[39-42].我们应该注意到，然而，幅度不大使用价值 ofAwould因为蕾参数影响改变的只是改变的回归分析回归常数和不适合的方程。到目前为止，我们已考虑过只挤压杆和简单的形状;一个小比例的铝合金的输出。很少在文献中关于为多孔洞的挤压或挤压使用桥或舷窗死了。[38] 报道的实验有关的形状以及挤压的城堡作为通过多孔模具挤压。不幸的是，工作被完成一些可以提高年前和数据的处理。作者用这数据显示，多孔挤压校正所需的因素可能是以外围的比率，计算方法使用所有孔 （即表示多个回合的挤压比只是...在其中 N 是数目孔） 和每个节圆直径等，A' = (DiDB-Dp) Dp 在哪里节圆直径和 DB 是坯料直径。图 4.13 显示结果分析和城堡的实验数据。估计的需通过桥或分流组合模挤压的压力可能被接近考虑作为两个单独的挤压件操作。

結果 (中文) 3:

有了这种现象一定是不正确的。事实上，粗略的计算（基于假设增加的流动应力是由于应变率效应）表明，在界面上的剪切必须发生在距离约40-60 / LM。因此，挤出的难度是由2个参数定义的，例如，一个有用的方法来判断一个新订单的挤压难度。此外，有相当大的进一步的证据表明，该方法可以是合理的[理论]。我们应该注意到，然而，使用价值ofawould基本不改变回归分析由于影响参数仅改变方回归常数，而不是方程拟合。到目前为止，我们只考虑了杆件的挤压和简单的形状；铝合金产量的小比例。很少有文献中关于多孔或使用桥或挤压挤压模具。城堡[ 38 ]报道了关于形状的挤压实验通过多孔模挤压。不幸的是，这工作是有一些前几年的数据处理可以提高。作者使用了这个数据表明，多孔挤压所需的修正因子可以用所有的孔（例如，为多发性轮的挤压是简单的……在哪里氮的数量孔）和节圆直径，是一个（DIDB DP，DP）是节圆直径和分贝是坯料直径。图4.13显示了结果分析和城堡的实验数据。所需的挤压通过桥或分流的压力估计死了可以通过考虑操作作为两个单独的型材接近。