US 2017/0001356 A1 · METHOD OF INJECTION MOLDING WITH CONSTANT-VELOCITY FLOW FRONT CONTROL

Abstract

In order to injection mold parts at a constant flow front velocity in a mold cavity of an injection molding system, particularly where the mold cavity has a varying thickness along its length, mold modeling software is used to calculate the cross-sectional area as a function of the distance from the gate, percentage of fill, or length of the mold cavity. Based on that cross-sectional area, the mold modeling software determines an appropriate recommended ram force profile and/or melt pressure profile that would result in filling the mold cavity at a constant flow rate. An injection molding system is then operated according to the recommended ram force profile and/or melt pressure profile.

Claims17

Dependent claims

A method, comprising:

simulating, using a mold flow simulator, an injection molding filling cycle;
determining a flow profile comprising a cross-sectional area of a flow front of a flow of molten thermoplastic material during the simulated injection molding filling cycle;
and
determining a force profile based at least in part on the determined flow profile, the force profile comprising a force to be applied to an injection molding ram such that the molten thermoplastic material has a substantially uniform flow front velocity at all times during a filling of one or more mold cavities in an injection molding apparatus operating the injection molding ram according to the determined force profile.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

15/198,556Filed 30 Jun 2016

Priority

30 Jun 2015

Published

5 Jan 2017

Term ends

Not estimatedThe source records don’t support an estimate.

Classification21 codes

B29C 45/77
Measuring, controlling or regulating: of velocity or pressure of moulding material
B29C 45/7646
Measuring, controlling or regulating: viscosity
B29C 45/766
Measuring, controlling or regulating: the setting or resetting of moulding conditions, e.g. before starting a cycle
B29C 45/7693
Measuring, controlling or regulating: using rheological models of the material in the mould, e.g. finite elements method

Method of injection molding with constant-velocity flow front control

Life of this patent

Method of injection molding with constant-velocity flow front control

Life of this patent

Abstract

Claims17