Method for deriving bulk viscosity of molding material
AssigneeCoretech System Co., Ltd.
InventorsYUAN-JUNG CHANG, RONG-YEU CHANG, CHEN-CHIEH WANG, CHIA-HSIANG HSU
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Abstract
The present disclosure provides a method for deriving a bulk viscosity of a molding material. The method includes a step of deriving a plurality of parameters in relation to pressures, specific volumes and temperatures (PVT) of the molding material under a plurality of cooling rates and a plurality of mechanical pressures; deriving an equilibrium pressure based on the plurality of parameters obtained from a first slowest cooling rate among the plurality of cooling rates; deriving a rate of volume change of the molding material; and obtaining the bulk viscosity of the molding material based on the rate of volume change.
Claims18
A method for deriving a bulk viscosity of a molding material, comprising:
- measuring pressures, specific volumes and temperatures (PVT) of the molding material under a plurality of cooling rates and a plurality of mechanical pressures performed by a measuring apparatus, wherein the measuring apparatus includes a testing chamber configured for holding the molding material therein, a temperature-controlling cylinder configured for forming the testing chamber and a piston configured for sealing an opening of the temperature-controlling cylinder, and wherein the measurement includes applying the plurality of cooling rates to the molding material inside the testing chamber under an isobaric environment, or applying the plurality of mechanical pressures to the molding material inside the testing chamber under an isothermal environment;
- deriving a plurality of parameters in relation to the pressures, specific volumes and temperatures (PVT) of the molding material based on the measurement;
- deriving an equilibrium pressure based on the plurality of parameters obtained from a first slowest cooling rate among the plurality of cooling rates;
- deriving a rate of volume change of the molding material;
- obtaining the bulk viscosity of the molding material based on the rate of volume change;
- simulating the molding material based on the bulk viscosity of the molding material to derive a simulation result of the molding material;
- and
- transmitting the simulation result of the molding material to a controller to control a molding machine based on the bulk viscosity of the molding material to perform a molding process.
(canceled)
(canceled)
A molding system for preparing an article, comprising:
- a molding machine;
- a mold disposed on the molding machine and having a mold cavity for being filled with a molding material;
- a processing module configured to generate a molding condition for the molding machine based in part on a bulk viscosity effect of the molding material within the mold cavity;
- and
- a controller operably communicating with the processing module and configured to control the molding machine based on the molding condition obtained from the processing module to perform an actual molding process for preparing the article,
- wherein the bulk viscosity effect is obtained based on the following expression:
- -
- μ
- d
- =
-
- σ
- -
- p
- ∇
- ·
- u
- where σ is a mechanical pressure on the molding material, p is a calculated equilibrium pressure, and ∇·u is a calculated rate of volume change.
Dependencies are inferred from the claim text.