Dies for extrusion moulding

Details Dies for extrusion moulding Dies for extrusion moulding

B - Operations, Transporting

29

C

18/735

B29C 45/12 (2006.01) B29C 45/20 (2006.01) B29C 45/78 (2006.01) B29C 47/20 (2006.01) H01F 41/02 (2006.01)

Patent

CA 2014974

ABSTRACT Dies For Extrusion Moulding A die for an extrusion moulding of a resin bound type magnet which is moulded by orientating a magnetic powder in a molten mixture of a magnetic powder and a resin and by solidification with cooling wherein the orientation section, located from a section from which the orientation of the aforementioned magnetic powder commences by application of a magnetic field at the frong end of the said die to a section of the die outlet, comprises a layer structure with at least one or more of different material, and at least one or more of the material of the said orientation section is a magnetic material, or the layer structure is comprised by an insertion of a low thermal conductive material having the thermal conductivity of K < 0.01 [cal/cm?sec?°C] , the insertion material comprises a non-magnetic material and the thickness of the non-magnetic material is 1/2 or less of a contacting length of the orientation section with the molten mixture, or the length 1 of the orientation section located from a section where a magnetic powder is orientated by an application of a magnetic field at the front end of the die to the die section satisfies 1 < d2 / 2D (d and D are the inner diameter and the outer diameter of the molten mixture passage) and in case a non-magnetic material is prevent in the orientation section, the total length 1' of the contacting section of the magnetic material with a mixture of a magnetic powder and a resin in a molten state satisfies 1' < d / (2D). A die for an extrusion moulding wherein a structure of the die comprises in order from a connecting section of an extrusion machine to an outlet of the orientation section as a converging section, a heat insulating section, a heating section and an orientation section, and the die which is suitable for production of a cylindrical resin bound type magnet.

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