Casting method for magnesium alloy casting sand mold

Abstract

The invention provides a casting method for a magnesium alloy casting sand mold. A preparation mold and magnesium alloy molding sand are involved. The mold comprises an upper sand box and a lower sandbox, the upper sand box is provided with a boss, and the lower sand box is provided with a corresponding groove; when the upper sand box covers the lower sand box, the groove sleeves the boss, a parting face is defined by a joint face of the upper sand box and the lower sand box, a mold cavity is formed through surrounding of the upper sand box and the lower sand box, a horizontal pouring gate isformed in the parting face, the magnesium alloy molding sand is smelted into a liquid state, the liquid-state magnesium alloy molding sand is poured into the mold cavity through the horizontal pouring gate, and after the sand is cooled, a magnesium alloy casting is obtained in the mold cavity. By adopting the technical scheme, through cooperation of the boss and the groove, accurate positioning when the upper sand box covers the lower sand box is completed so that an asbestos rope can be accurately arranged on the corresponding portion of the farting face, the function of guiding the poured magnesium alloy molding sand is achieved, the situation is avoided that the liquid-state magnesium alloy molding sand enters the casting mold, the slag inclusion defect of the casting is effectively prevented, and the quality of the casting is improved.

Description

technical field [0001] The invention belongs to the technical field of casting technology, and in particular relates to a sand casting method for magnesium alloy castings. Background technique [0002] In the traditional magnesium alloy sand casting, when pouring the smelted liquid magnesium alloy metal liquid into the cavity through the runner, in order to prevent the liquid magnesium alloy metal liquid from entering the mold and avoid slag inclusion defects in the obtained castings, now In the existing technology, the following two methods are generally used to prevent slag inclusions in castings. One is to place asbestos ropes between the runner and the mold, and the other is to place sealing mud strips between the runner and the mold. . When using the first form, it is necessary to use sticky paste. Hardening of the sticky paste after baking will affect the dimensional accuracy of the casting. If it is not baked, it will be heated and gas will affect the metallurgical q...

AI Technical Summary

Problems solved by technology

When using the first form, it is necessary to use sticky paste. Hardening of the sticky paste after baking will affect the dimensional accuracy of the casting. If it is not baked and heated, it will affect the metallurgical quality of the casting.

When using the second form, due to the deformation of the sealing mud strip, baking or non-baking will affect both the size of the casting and the metallurgical quality of the casting.