SYSTEM AND METHOD FOR MOULDING METAL PARTS

Abstract

A system and method for moulding metal parts having a first metal structure (4) which is integrally attached to a rotating machine, where said structure (4) is associated with a cover (3) and a plurality of fastening elements (1, 2), and where, in turn, the structure (4) is integrally attached to a cylindrical metal die (5) containing a ceramic mould (7) and hardened sand (6) for filling the die (5).

Claims

1. A system for moulding metal parts comprising: a first metal structure (4) which is integrally attached to a rotating machine, where said structure (4) is associated with a cover (3) and a plurality of fastening elements (1, 2), and where, in turn, the structure (4) is integrally attached to a cylindrical metal die (5) containing a ceramic mould (7) and hardened sand (6) for filling the die (5).

2. A method for moulding metal parts implemented in the system according to claim 1, the method comprising the steps of: a) making a polystyrene model of a metal part; b) introducing the polystyrene model in a liquid zirconium sand and binder mixture; c) coating the polystyrene model with zirconium sand; d) introducing the part in a drying oven for about thirty minutes at 30° C.; e) applying a liquid layer of a silica and silicon dioxide binder mixture; f) coating the part with kaolin; g) introducing the part in a drying oven for about 45 minutes at 50° C.; h) repeating steps f) and g) until the part obtains a ceramic thickness of between 10 and 15 millimetres; i) introducing the part in a high-temperature oven for about an hour at a temperature of 1050° C. until the polystyrene becomes volatile and the ceramic mould (7) is obtained; j) attaching the mould (7) to the die (5) inside the latter and adding hardened sand (6); and k) attaching the die (5) to the structure or base (4) to the centrifuging machine and casting the molten material.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] A series of drawings that help to better understand the invention and which expressly relate to an embodiment of said invention provided as a non-limiting example thereof is very briefly described below.

[0016] FIG. 1 shows a view of a practical embodiment of the system for moulding metal parts, object of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0017] The attached drawings show a preferred embodiment of the invention. More specifically, it comprises a first metal structure or base (4) which is integrally attached to a rotating machine, said machine rotating the assembly at a high speed, and where said structure (4) is associated with a cover (3) and with a plurality of fastening nuts (1) and bolts (2), and where, in turn, the structure is integrally attached to a cylindrical metal die (5) containing a ceramic mould (7) and hardened sand (6) for filling the die (5).

[0018] The method of moulding ceramic parts includes: [0019] i) In a first step, producing a polystyrene model of the part to be produced; said model can be produced by injecting polystyrene onto an aluminium mould in the event of mass production of parts, or by means of machining a polystyrene block from a polystyrene block for producing unitary parts. [0020] ii) In a second step, introducing the polystyrene model in a liquid ceramic “Milled Zircon®” (zirconium sand) and “Primcote®” (a binder) mixture until the model is fully impregnated. [0021] iii) In a third step, coating the impregnated model with a layer of zirconium sand. [0022] iv) Subsequently introducing the obtained part in a drying oven for about thirty minutes at 30° C. [0023] v) Then, once the part is taken out of the oven, applying a liquid layer of a ceramic mixture made up of “Fascote Binder 6” (silica binder) and “Fascote Refractary®” (silicon dioxide). [0024] vi) Coating the part with a “Molochite®” type (kaolin) ceramic material. [0025] vii) Introducing the part in a drying oven for about 45 minutes at a temperature of 50° C. [0026] viii) Repeating steps vi) and vii) until the part obtains a ceramic thickness of between 10 and 15 millimetres. [0027] ix) Introducing the part in a high-temperature oven for about an hour at a temperature of 1050° C. so that the polystyrene becomes volatile, obtaining the ceramic mould (7). [0028] x) Attaching the mould (7) to the die (5) inside the latter and adding hardened sand (6). [0029] xi) Fixing the structure or base (4) to the centrifuging machine and casting the molten metal at a variable rate depending on the particular needs of each part, obtaining the final metal part. [0030] xii)