Low-pressure casting process

Abstract

The invention discloses a low-pressure casting process. The process is characterized by comprising the following steps that (1) tools and materials are prepared, a mold coating agent is fully stirred before being used, whether ventilation of a mold baking device is uniform is checked, the air leakage phenomenon in the position of a connector is avoided, whether a spray gun leaks must be checked firstly, and sealing gaskets, filter screens and high-temperature-resistant lubricating oil are prepared; (2) a mold is prepared; (3) molten aluminum is prepared, and according to the requirements for the molten aluminum, the measured hydrogen density of the molten aluminum is not smaller than 2.45 g / cm<3>, the temperature of the molten aluminum is controlled according to requirements of a low-pressure production operation instruction, complete slagging-off must be conducted before and after the molten aluminum is added into a holding furnace, the storage time of the molten aluminum in the holding furnace is not longer than 4 h, and use of the molten aluminum is prohibited if the storage time is longer than 4 h; and (4) the mold opening temperature is required to reach 380-450 DEG C, the mold is closed for temperature uniformizing for 3-6 min, and the mold is opened into 3 pieces for making pouring rejected products, so that the temperature is balanced, and the mold temperature is increased. The low-pressure casting process is simple, multiple repeated procedures are omitted, and work efficiency is improved.

Description

technical field [0001] The invention relates to a low-pressure casting process. Background technique [0002] At present, the low-pressure casting process is relatively complicated, and there is no unified specification and standard, resulting in uneven production of castings, and many repeated processes also make the production efficiency low, increase the labor burden of workers, and make the market competitiveness of the products. high. For some operators who have just entered the industry, there is no clear method and process, resulting in frequent mistakes and omissions during operation, and may even cause serious consequences. Contents of the invention [0003] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a low-pressure casting process, which is simple in process, eliminates many repetitive processes, and improves work efficiency. [0004] In order to achieve the above object, the...

AI Technical Summary

Problems solved by technology

[0002] At present, the low-pressure casting process is relatively complicated, and there is no unified specification and standard, resulting in uneven production of castings, and many repeated processes also make the production efficiency low, increase the labor burden of workers, and make the market competitiveness of the products. high

For some operators who have just entered the industry, there is no clear method and process, resulting in frequent mistakes and omissions during operation, and may even cause serious consequences