Method and device for realizing direct extrusion casting by utilizing closed mould pouring

Abstract

The invention discloses a method and a device for realizing direct extrusion casting by utilizing closed mould pouring. The method comprises the following steps of: premoulding a convex mould and a concave mould to form a closed filling space; filling inertia protective gas into the filling space; introducing an alloy melt into a charging barrel by utilizing a transporting system; pressing the alloy melt into a mould cavity by a pressure head, thus filling is completed; and carrying out direct extrusion by adopting the way that the convex mould moves downward, and causing the alloy melt to be crystallized and solidified under pressure. The device for realizing the method has the main connection relationship that: the convex mould is fixedly connected with a movable cross beam of a casting machine; a convex mould limit support is fixedly connected with a convex mould base; a convex mould limit cushion block and a mould frame are in sliding fit and are connected with a hydraulic cylinder at a cushion block side; and the pressure head is arranged in the charging barrel in a movable fit manner and is connected with a filling / ejecting hydraulic cylinder of the casting machine. The method and the device disclosed by the invention fully utilize a direct extrusion mode and have the advantages that extrusion area is large, extrusion acting force transmission distance is short and uniform and pressure loss is less, and the alloy melt is transmitted by virtue of a closed pipeline, thus oxidation inspiration is reduced.

Description

technical field [0001] The invention relates to the field of direct extrusion casting, in particular to a closed-mold pouring direct extrusion casting method and a device thereof which are particularly suitable for producing non-ferrous alloy castings. Background technique [0002] At present, the direct squeeze casting method belongs to open mold casting, which is to pour a certain amount of alloy melt into the die manually or with a robot, and then the punch squeezes the alloy melt to make the alloy The melt crystallizes and solidifies under pressure. Due to the use of manual or robotic hands to pour in the mold-opening state, there are the following disadvantages and deficiencies: [0003] 1. Use a pouring ladle to take the alloy melt from the furnace and pour it. The alloy melt is exposed to the air, so it is difficult to protect against oxidation, and it is difficult to accurately control the pouring amount. [0004] 2. Mold closing and die-casting must be done after ...

AI Technical Summary

Problems solved by technology

[0003] 1. Use a pouring spoon to take the alloy melt from the furnace and pour it. The alloy melt is exposed to the air, so it is difficult to protect against oxidation, and it is difficult to accurately control the pouring amount.

[0004] 2. The mold must be closed and die-casted after the pouring is completed, so the process from pouring to die-casting is not only time-consuming, but also the castings are prone to defects such as cold shut and segregation, and the quality is difficult to guarantee

[0005] 3. In order to ensure the melting state of the alloy melt during die-casting, it is necessary to increase the pouring temperature of the melt or the temperature of the mold. The melting energy consumption is large and the life of the mold is also affected.

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