Method for indirect extrusion casting by utilizing filling of electromagnetic force and device thereof

Abstract

The invention relates to a method for indirect extrusion casting by utilizing the filling of electromagnetic force and a device thereof. In the method, electromagnetic force is utilized to introduce liquid metal into an extrusion chamber to fill part of a mould cavity by a transmission pipeline; when the liquid metal in the mould cavity reaches a preset quantity, the transmission of the liquid metal is stopped; and an extrusion punching head ascends to push the liquid metal to fill the part which is not full in the mould cavity and continuously ascends to extrude and shape the liquid metal, and the liquid metal in the transmission pipeline flows back to a thermal insulation furnace under the function of reverse electromagnetic force. The invention has simple and convenient method, high automatization degree, good stability and skillful structural design of a special device. The liquid metal is transmitted and filled by a sealed transmission pipeline, and oxidation and air suction are reduced; the flow speed and the flow rate are controllable, and the quantification of extrusion casting is realized; at the time of extrusion shaping, the liquid metal in the transmission pipeline flows back, and the production efficiency is enhanced; and the friction and the abrasion of the extrusion punching head and the extrusion chamber are reduced, and the service lives of the extrusion punching head and the extrusion chamber are enhanced.

Description

technical field [0001] The invention relates to squeeze casting, in particular to an indirect squeeze casting method and a device thereof which utilize electromagnetic force to fill a mold cavity with liquid metal. Background technique [0002] Squeeze casting is also called liquid die forging. This process is to pour a certain liquid or semi-solid metal into the mold cavity, and act on the liquid metal with a certain extrusion force through the extrusion punch to make it fully crystallized, solidified and Forming, a method of net accurate forming of materials to obtain parts of the desired shape. Using this process to solidify liquid metal under high pressure, heat-treatable high-density castings can be obtained. Among them, indirect squeeze casting can produce large-scale, complex and precise parts, which represents the main development direction of squeeze casting. [0003] The current indirect squeeze casting forming method mainly adopts the pouring method of artificia...

AI Technical Summary

Problems solved by technology

[0004] 1) Take the molten metal from the crucible with a pouring ladle and pour it from the mouth of the pressure chamber. The liquid metal is exposed to the air and is easy to oxidize, and it is difficult to accurately control the pouring amount of the liquid metal;

[0005] 2) Liquid metal is poured into the pressure chamber from top to bottom, which is easy to cause gas and inclusions to be involved;

[0006] 3) Pouring is performed with the upper and lower molds open, the time interval from pouring to extrusion is long, the melt is uneven, and segregation is easily caused, and the temperature of the liquid metal drops quickly, which is easy to oxidize and absorb gas;

[0007] 4) In order to prevent quality defects caused by the temperature drop of liquid metal before injection, it is necessary to increase its melting temperature, or additionally add a pressure chamber heating system, which consumes a lot of energy

However, when pouring with this device, liquid metal is poured into the pressure chamber from a high place by gravity, which is still easy to cause gas and inclusions to be involved; the pressure chamber needs to store all the liquid metal, and when producing large parts, the extrusion punch moves Long distances increase friction and wear between the press chamber and extrusion punch, reducing the life of both

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