Compound casting process method applying sand casting and investment casting

Abstract

The invention discloses a compound casting process method applying sand casting and investment casting. The compound casting process method is characterized by comprising the following steps: 1) determining the specific shape of a flow gate according to a process design demand, establishing a flow gate model by means of simulative software, carrying out simulative verification through the simulative software to make sure that the flow rate of the flow gate is smaller than 0.5 m / s to reduce formation of oxidation slag inclusion, and designing a feeding system and a gating system according to the casting structure, weight and casting demand; and 2) manufacturing a flow gate formwork by means of a investment casting process: manufacturing the flow gate formwork according to wax making, coating, dewaxing and sintering, wherein the thickness of the flow gate framework is greater than 15 mm, the roasting time is longer than 120 minutes, the roasting temperature is higher than 1000 DEG C, andthe refractoriness of the flow gate framework is higher than 1700 DEG C; when a wax mold is manufactured, single small batch castings are processed and formed by polystyrene foam plates while wax pattern molds are used for large batch castings. The compound casting process method further improves the product quality by improving the precision of the flow gate.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a composite casting process using sand casting and investment casting. Background technique [0002] In order to ensure the stability of high-alloy steel castings during filling, the design requirements of the gating system are relatively high, especially the shape of the ingate is designed to be very complicated, so it is difficult to take the mold, and the non-standard inner Gates or complex ingates are usually combined with several sand cores. At the same time, the ingate core box mold needs to be opened and the core needs to be prepared, resulting in increased production costs. In addition, the combination of sand cores reduces the cost of the ingate. Accuracy, the combined ingate is thick, bulky and difficult to place and fix at the mold, which increases the workload of the operation. Contents of the invention [0003] The purpose of the present invention is to provide a ...

AI Technical Summary

Problems solved by technology

[0002] In order to ensure the stability of high-alloy steel castings during filling, the design requirements of the gating system are relatively high, especially the shape of the ingate is designed to be very complicated, so it is difficult to take the mold, and the non-standard inner Gates or complex ingates are usually combined with several sand cores. At the same time, the ingate core box mold needs to be opened and the core needs to be prepared, resulting in increased production costs. In addition, the combination of sand cores reduces the cost of the ingate. Accuracy, the combined ingate is thick, bulky, and difficult to place and fix at the mold, increasing the workload of the operation