Method and device for realizing shell heating and heat preservation in vacuum casting equipment

Abstract

The invention relates to a method and device for realizing shell heating and heat preservation in vacuum casting equipment. The device comprises a heat preservation bag used for heating or heat preservation of a shell device and a centrifugal tray device. The heat preservation bag is arranged in the vacuum casting equipment, a second opening is formed in the bottom of the heat preservation bag, and a first opening is formed in the bottom of the vacuum casting equipment and aligned with the second opening. The centrifugal tray device is used for carrying the shell device, and the centrifugal tray device and the vacuum centrifugal casting equipment are independent of each other. When the centrifugal tray device carrying the shell device enters the vacuum centrifugal casting equipment from the first opening, the shell device just enters the heat preservation bag through the second opening, and the centrifugal tray device and the first opening can be assembled in cooperation to achieve vacuum sealing of the first opening. Shell heating and heat preservation can be conducted in the vacuum casting equipment, the centrifugal tray device and the shell device can be independently carried and assembled conveniently, and the technological requirements of centrifugal casting can be met.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a method and a device for realizing mold shell heating and heat preservation in vacuum melting and casting equipment. Background technique [0002] High-temperature titanium alloys and titanium-aluminum alloys are widely used in the vicinity of aerospace heat-resistant structures and show great application prospects. However, these two types of alloys have poor casting fluidity, high stress during solidification and cooling, and are easy to crack. The integrity and reliability of castings are greatly compromised. At present, many studies have shown that increasing the temperature of the mold or shell during pouring can greatly improve the flow filling ability of high-temperature titanium alloys and titanium-aluminum alloys. Relieve stress and reduce deformation and cracking. As a result, a new casting process for shell heating and heat preservation and solidificatio...

AI Technical Summary

Problems solved by technology

Such shell preheating method has the following obvious disadvantages: (1) the shell or sand box (with shell) that will be heated to a higher temperature is transferred from one device to the operation of placing and fixing it in the vacuum melting and casting equipment. Convenience, inefficiency, but also very dangerous, especially for larger and heavier mold shells or flasks

(2) The mold shell or sand box (equipped with mold shell) in a high temperature state during the transfer process will cause heat radiation to the staff and damage the health; (3) In order to ensure the safety of the transfer, the mold shell or sand box (equipped with The allowable preheating temperature of the mold shell) cannot be too high; (4) The heated mold shell is always in a waiting state during the transfer and placement process, vacuuming and heating and smelting of the metal material, and the heat loss is serious. It is difficult to effectively monitor and control the temperature, and it is difficult to ensure that the actual temperature of the mold shell meets the theoretical preset value at the time of final pouring, making the actual process unstable

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