Casting sand core box and manufacturing method thereof

Abstract

The invention belongs to the technical field of casting, and mainly relates to a casting sand core box and a manufacturing method thereof. The casting sand core box comprises a core box model; the core box model comprises a basic type and a profile type; the working surface of the profile type is matched with a casting in shape; the opposite surface of the working surface of the profile type and the mounting surface of the basic type are mounted in a matched mode; and the mounting surface of the basic surface is of a fluctuation regular structure. According to the core box provided by the invention, the basic type and the profile type can be manufactured simultaneously, the basic type and the profile type are each divided into a plurality of corresponding blocks, each module can be machined separately and simultaneously, the strength of the core box is ensured, size control over a sand core is facilitated, the production cycle of the core box is significantly shortened, and maintenanceis simple and convenient.

Description

technical field [0001] The invention belongs to the technical field of casting, and mainly relates to a casting sand core box and a manufacturing method thereof. Background technique [0002] The surface of large water turbine blades is curved, with large outline dimensions, strict tolerances, complex process modeling, high overall requirements, and easy deformation during casting. Therefore, three-dimensional core assembly method is usually used for large water turbine blades. Compared with the traditional molding method, the three-dimensional core assembly molding method has the advantages of light lifting weight of the sand core, easy operation and control, and short production cycle. Mass production. At present, the core boxes used in the production of sand cores by the three-dimensional core assembly method are usually wooden core boxes, which mainly have the following three disadvantages: [0003] 1) The main material of the core box is low in strength and variable. ...

AI Technical Summary

Problems solved by technology

[0003] 1) The main material of the core box is low in strength and variable. The sand core of a large-scale water turbine blade is about 70 tons. Due to the high structural strength requirements of the core box, the core box with a wooden frame structure is used. For batch parts, the core box is easily deformed. Damage, resulting in deformation of the sand core, and the process of setting the core will cause the sand core to match the size inconsistent;

[0004] 2) The production cycle of the core box is long. Due to the complex profile of the blade, it needs to be processed by a 5-axis machining center as a whole. The cycle of the traditional wooden core box is about 25 days, accounting for one-fifth of the total production cycle of the blade blank, which affects the overall delivery of the product. Expect;

[0005] 3) The repair cycle of the core box is long and the cost is high. The core box and loose blocks of large turbine blades are likely to cause deformation and damage to the main material in the process of core making and mold removal, and at the same time, the size of the complex curved surface is not easy to repair

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