Method for removing a part made of a material having a glass-transition temperature from a mold

Patent metadata

Field	Value
Publication number	US-9505055-B2
Application number	US-201214124854-A
Country	US
Kind code	B2
Filing date	Jun 1, 2012
Priority date	Jun 9, 2011
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

A method for removing a part from a mold and to a machine for molding the part, the part made of a material having a glass-transition temperature and a melting temperature that is higher than the glass-transition temperature, and which is shaped in the cavity of a mold, includes at least two mold portions defining the shaping cavity therebetween. The mold is at a temperature between the glass-transition temperature and the melting temperature. The method includes opening the mold by spacing apart the mold portions, locally spraying a cooling gas toward the part remaining in a portion of the mold using at least one nozzle, and, after a predetermined time period following the start of spraying the gas, ejecting the part from the portion of the mold, the time period being such that the part reaches a temperature that is lower than the glass-transition temperature thereof.

First claim

The invention claimed is:

1. A method for removing from a mold a part made of a material that has a glass transition temperature and a melting point higher than said glass transition temperature, which is shaped in a cavity of a mold comprising:
providing at least two mold segments ( 3 , 4 ) having a shaping cavity ( 5 ) therebetween, the mold at a temperature between said glass transition temperature and said melting point;
opening of the mold by parting said at least two mold segments ( 3 , 4 );
spraying a cooling gas toward the part that remains in one of the at least two mold segments;
and, after a delay following the start of the spraying of the gas, ejecting the part from the one mold segment, the delay being such that the part reaches a temperature below said glass transition temperature.

2. The method as claimed in claim 1 , involving stopping the spraying of the cooling gas before ejecting the part.

3. The method as claimed in claim 1 , involving ejecting the part while the cooling gas is being sprayed.

4. A method for shaping a part made of a material that has a glass transition temperature and a melting point higher than said glass transition temperature, the method comprising the removal method of claim 1 and further comprising a step prior to the removal step of bringing a quantity of the material to a temperature between said glass transition temperature and said melting point and injecting the quantity of material into said shaping cavity when the at least two mold segments ( 3 , 4 ) are coupled together so as to shape the material to the shape of the shaping cavity ( 5 ).

5. A method for shaping a part made of a material having a glass transition temperature and a melting point higher than said glass transition temperature, the method comprising the removal method of claim 1 and further comprising a step prior to the removal step of bringing a quantity of the material into a hollow portion of one of the at least two mold segments and coupling the at least two mold segments ( 3 , 4 ) in order by die stamping to shape the material to the shape of the shaping cavity ( 5 ).

Assignees

• Gravier Sébastien
• Kapelski Georges
• Blandin Jean-Jacques
• Josserond Charles
• Univ Joseph Fourier
• Inst Polytechnique Grenoble
• Centre Nat De La Rech Scient (Cnrs)

Inventors

• Gravier Sébastien
• Kapelski Georges
• Blandin Jean-Jacques
• Josserond Charles

Classifications

• B22D30/00

  Cooling castings, not restricted to casting processes covered by a single main group (accessories for cooling cast stock in continuous casting of metals B22D11/124; controlling or regulating processes or operations for cooling cast stock or mould in continuous casting of metals B22D11/22; chill casting B22D15/00) · CPC title

• B22D17/2236 Primary

  Equipment for loosening or ejecting castings from dies (for plastics B29C45/40) · CPC title

• B22D29/00

  Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots {(B22D13/10, B22D11/124, B22D17/00 take precedence)} · CPC title

• B22D27/04

  Influencing the temperature of the metal, e.g. by heating or cooling the mould · CPC title

• B22D25/06 Primary

  by its physical properties (B22D27/00 takes precedence) · CPC title