英語(yǔ)翻譯
One of the basic problems in the development and production process of moulds for injection moulding is the control of temperature con-
ditions in the mould.Precise study of thermodynamic processes in moulds showed,that heat exchange can be manipulated by thermoelectrical
means.Such system upgrades conventional cooling systems within the mould or can be a stand alone application for heat manipulation within
it.
In the paper,the authors will present results of the research project,which was carried out in three phases and its results are patented in A686\2006
patent.The testing stage,the prototype stage and the industrialization phase will be presented.The main results of the project were total and rapid
on-line thermoregulation of the mould over the cycle time and overall influence on quality of plastic product with emphasis on deformation
control.
Presented application can present a milestone in the field of mould temperature and product quality control during the injection moulding process.
© 2006 Elsevier B.V.All rights reserved.
Keywords:Injection moulding; Mould cooling; Thermoelectric modules; FEM simulations
1.Introduction,definition of problem
Development of technology of cooling moulds via thermo-
electrical (TEM) means derives out of the industrial praxis and
problems,i.e.at design,tool making and exploitation of tools.
Current cooling technologies have technological limitations.
Their limitations can be located and predicted in advance with
finite element analyses (FEA) simulation packages but not com-
pletely avoided.Results of a diverse state of the art analyses
revealed that all existing cooling systems do not provide con-
trollable heat transfer capabilities adequate to fit into demand-
ing technological windows of current polymer processing
technologies.
Polymer processing is nowadays limited (in term of short-
ening the production cycle time and within that reducing costs)
only with heat capacity manipulation capabilities.Other produc-
tion optimization capabilities are already driven to mechanical
and polymer processing limitations [3].
1.1.Thermal processes in injection moulding plastic
processing
Plastic processing is based on heat transfer between plastic
material and mould cavity.Within calculation of heat transfer
one should consider two major facts:first is all used energy
which is based on first law of thermodynamics—law of energy
conservation [1],second is velocity of heat transfer.Basic task
at heat transfer analyses is temperature calculation over time
and its distribution inside studied system.That last depends on
velocity of heat transfer between the system and surroundings
and velocity of heat transfer inside the system.Heat transfer can
be based as heat conduction,convection and radiation [1].
With the application of TEM module,it is possible to signif-
icantly reduce the cycle time in the injection moulding process.
The limits of possible time reduction lies in the frame of 10–25%
of additional cooling time,describe in Section 1.2.
With the application of TEM module it is possible to actively
control the warping of the product and to regulate the amount
of product warpage in the way to achieve required product tol-
erances.
The presented TEM module cooling application for injection
moulding process is a matter of priority note for the patent,held
and owned by TECOS.