Core setting size control device and method for annular casting

Abstract

The invention relates to the technical field of casting, in particular to a core setting size control device and method for an annular casting. The core setting size control device for the annular casting comprises a rotary shaft which is vertically arranged. A fixed base is arranged at the bottom of the rotary shaft, and a rotary bearing is fixedly arranged on the rotary shaft. A connecting rack is fixedly arranged on the outer circle of the rotary bearing, and is fixedly connected with a cross beam. The tail end of the cross beam is fixedly connected with a vertical beam. The lower portion of the vertical beam is fixedly connected with a clamping plate, and the shape of the clamping plate is matched with the radial contour of a cavity of the annular casting. By the adoption of the device, the core setting size and position accuracy of all combined sand cores can be accurately controlled in the core setting process of the large-scale annular casting; moreover, the technological processes of repeatedly adjusting the positions and sizes of the sand cores and conducting repeated measurement in the core setting process are effectively reduced, and the core setting operational process is simplified.

Description

technical field [0001] The invention relates to the technical field of size control of the core setting process in the sand core casting process, in particular to a device for controlling the size of the lower core of an annular casting and a method for controlling the size of the lower core. Background technique [0002] When molding large-scale annular castings, the method of core assembly molding is usually used, that is, the molding is carried out by combining two or more sand cores. Large ring castings, such as common hydraulic turbine upper crown and lower ring castings, mining machinery ring gear castings, etc., mostly have a diameter of more than 4000mm. The shape and structure are simple and the diameter is large. Because the wall thickness of this type of casting is small, it is completely molded in real form. If the mold wall thickness is small, the strength will be relatively low. Therefore, the method of combining the outer contour real sample mold with the inn...

AI Technical Summary

Problems solved by technology

[0003] For this type of casting, tire boards need to be made as the core base during core molding, and the molding process needs to turn over the box, but the size of the casting is large, and the required sand box is large. It is not easy to level the sand box during the molding process, which will cause problems such as misalignment and inclination of the reference plane of the lower core, which will cause serious deviations in the size of the lower core, and increase the process cost of the mold making and molding process

At the same time, when the core is assembled and molded, the sand core is partially uneven and difficult to be found, which will lead to uneven wall thickness of the casting; or due to the large size of the casting, the positioning reference of the sand core will be misaligned, causing the overall mold to be deformed , leading to the deformation of the casting in the later stage; or the gap between the sand cores is not uniformly controlled when the core is lowered, which is prone to large cracks

In this way, the same sand core needs to be adjusted multiple times and the size of the mold is measured, which will also lead to prolongation of the production cycle and increase the production cost

Images