Laser generation of thermal insulation blanket
A themial insulation method for an internal surface of an injection molding casting die includes forming a thermal insulation blanket on the internal surface using laser cladding. One or more layers of a metal material having suitable thermal emittance and melting point characteristics is applied to the internal surface using laser cladding. Because the impact area of the injected molten metal is subject to greater stress and temperature gradients than the remainder of the surface, laser cladding can be used to apply the thermal insulation blanket only to areas that require additional protection.
1. A thermal insulation method for an internal surface of an injection molding casting die comprising:
selecting at least one metal material having a thermal emiflance that is approximately equal to or less than 0.25 and a melting point that is approximately equal to or greater than 1000° C;
forming a first thermal insulation layer with the at least one metal material on the internal surface using laser cladding, wherein an area of the first thermal insulation layer is substantially equal to an area of the internal surface;
determining an impact point for injection molding on the internal surface;
determining a location of the first thermal insulation layer that corresponds to the impact point; and
forming a second thermal insulation layer with the at least one metal material at the corresponding location using laser cladding, wherein an area of the second thermal insulation layer is less than the area of the first thermal insulation layer.
2. The method of claim 1 further comprising forming a carbon-carbon mesh layer on the internal surface.
3. A thermal insulation method for an internal surface of an injection molding casting die comprising:
forming at least one offset region in the internal surface of the injection molding casting die;
selecting at least one metal material having a thermal emittance that is approximately equal to or less than 0.25 and a melting point that is approximately equal to or greater than 1000° C; and
forming a thermal insulation layer with the at least one metal material in the at least one offset region, wherein a thickness of the first thermal insulation layer is substantially equal to a depth of the at least one offset region.