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注塑模三位模型的数字模拟英文文献和中文翻译

时间:2017-12-04 21:06来源:毕业论文
(State Key Lab of Mould&Die Technology,Huazhong Universicy of Science and Technology,WuhaIl 430074,China)Abstract:Most iniection molded parts are three.dimensional, with complex geometrical coⅢigurations and thick/thin wall
(State Key Lab of Mould&Die Technology,Huazhong Universicy of Science and Technology,WuhaIl 430074,China)Abstract:Most iniection molded parts are three.dimensional, with complex geometrical coⅢigurations and thick/thin wall sections.The change of the thickness of pans has significant innuence on now during injeetion molding.This paper presents a3 D 6nite element model to deal with the three—dimensional now,which can more accuratelv predict the 6lling pmcess than a2.5 D model. In this model,equal—order velocity—pressure interpola—tion method is successfullv employed and the relation between velocity and pressure is obtained f而m the dis—cretized momentum equation in order to derive the pressure equation. A 3D contml volume scheme is employed to track the now f而nt.The validity of the model has been tested thIDugh the analysis of the now in a
cavity.Key words:3 D:iniection molding;simulation;equal—order interp01ation 16154
CLC number:TG24l Document code:A AnicleⅢ:1005_9113(2005)02旬129一05
To impmve the mold design and process contml in
injection molding, increasing relianee has been placed
on CAD/CAE/CAM. Commerciallv available
l
1。com.
puter simulation packages of the injection molding
Drocess have now beeome routine tools fbr both mold
designers and process engineers.
0ver the last fbw decades.two kinds of simulation
techniques, known as the middle—plane technique and
the dual domain technique,respectively,have been de—
veloped to predict the behavior of molten polvmers dur—
ing the filling of injection molds. In the 6rst method,a
middle—plane is used as the datum plane of a
cavity in
three.dimensional space, which is meshed bv creating
triangular 6nite elements. While in the second method,
sud.aces of the cavitv replace the middle.plane. Howev— 源自六-维+论\文"网*加7位QQ3249.114 www.lwfree.cn
er, these two techniques are both 2.5 D mold 6Ⅱing
models that use the Hele—Shaw approximation
12 o
while
analvzing the now. In 2.5 D model,the variations of
velocity and pressure in the gapwise (thickness) di—
mension are neglected, so the filling of a m6ld cavity
becomes a 2D Droblem in the direction of now and a 1 D
problem in the thickness direction because most injec—
tion m01ded parts have the characteristie of being thin
but generallv of complex shape. In most cases, these
models have been successful in predicting the velocity,
pressuI℃6elds,temperature distribution in the parts or
m01d,weldline location as well as the position of the
now fronts and so on. However. because of the use of
the Hele—Shaw approximation, the information that
these models can generate is limited and incomplete.
The variations in the gapwise(thickness)dimension of
the physical quantities with the exception of the temper-
ature.whieh are solved bv finite difkrence method,are
neglected. With the continued development of molding
teehniques, molded parts will have more and more
complex geometries and the difkI.ence in the thickness
will be more and more notable so that the ehange in the
gapwise(thickness) dimension of the physical quanti—
ties are no longer nedigible.In addition,the now sim—
ulated looks unIealistic inasmuch as the melt p01ymer
flows onlv on sud'aces of a cavity, and appears more
obvious when the now simulation is displayed in a
mould cavity.
A 3 D simulation model for plastic iniection m01d—
ing has been a research diI.ection and hot spot in the
scoDe of simulation. In the 3D simulation model,ve.
10city in the gapwise(thickness)dimension is not neg— 注塑模三位模型的数字模拟英文文献和中文翻译:http://www.lwfree.cn/fanyi/20171204/17359.html
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