Manufacturing method for rear case body of gear case

Abstract

The invention discloses a manufacturing method for a rear case body of a gear case. An upper box and a lower box are adopted for modeling. The manufacturing method includes the following steps of precoated sand manufacturing, modeling, mould assembling, smelting, pouring, sand shakeout, pouring gate removing, surface cleaning, heat treatment, descaling, polishing, test and acceptance, primer coating and drying. According to the manufacturing method, the core setting process is simplified, a cavity core and the lower box are directly made together, and therefore the core manufacturing process and the core setting process in the modeling procedure are omitted, and a series of resulting problems and hidden dangers are prevented; and meanwhile, the precoated sand process and the reclaimed sand process are optimized, and the manufacturing requirements of the high-quality gear case can be met through the whole manufacturing method.

Description

technical field [0001] The invention belongs to the technical field of gear boxes, and in particular relates to a manufacturing method of a gear box rear case. Background technique [0002] The existing manufacturing method of the rear box of the gearbox generally adopts the upper and lower box molding, and uses the bottom casting process. A large core is formed in the cavity of the box body, and the lower core is poured after the lower box. The lower box is easy to cause the problem of the cooperation between the outer mold core head and the core core head. If the gap is too large, the positioning will be inaccurate and the core will be biased. The air outlet direction is drawn from the lower box. If the gap between the two joint surfaces is too large, it will easily cause a fire during pouring and directly cause the product to be scrapped. At the same time, the existing production process of coated sand is relatively simple, only raw sand, resin and curing agent , the per...

AI Technical Summary

Problems solved by technology

[0002] The existing manufacturing method of the rear box of the gearbox generally adopts the upper and lower box molding, and uses the bottom casting process. A large core is formed in the cavity of the box body, and the lower core is poured after the lower box. The lower box is easy to cause the problem of the cooperation between the outer mold core head and the core core head. If the gap is too large, the positioning will be inaccurate and the core will be biased. The air outlet direction is drawn from the lower box. If the gap between the two joint surfaces is too large, it will easily cause a fire during pouring and directly cause the product to be scrapped. At the same time, the existing production process of coated sand is relatively simple, only raw sand, resin and curing agent , the performance cannot meet the requirements of high-quality gearboxes, and the recycling of recycled sand is not enough