Integrated sand core for integrated molding of railway wagon side frame guiding frame and stop key mounting surface as well as production method of integrated sand core

Abstract

The invention discloses an integrated sand core for integrated molding of a railway wagon side frame guiding frame and a stop key mounting surface as well as a production method of the integrated sand core. The integrated sand core comprises a sand core part A for molding the railway wagon side frame guiding frame and a sand core part B for molding the stop key mounting surface, wherein the sand core part B is the part that the sand core part A extends in the vertical direction of the sand core part A and enlarges in the width direction to contain the stop key mounting surface, and the sand core part A and the sand core part B constitute the sand core adopting an integrated structure. Different from the technological method for molding the guiding frame and the stop key mounting surface respectively by using a sand core and a contour, the integrated sand core is used for molding the side frame guiding frame and the stop key mounting surface, that is, the side frame stop key mounting surface is molded while the side frame guiding frame is molded integrally by the aid of the integrated sand core, so that the side frame stop key mounting surface is free of draft angles, steps and trimming, the appearance quality and the inherent quality of the stop key mounting surface are effectively improved, and the cleaning work intensity of repair welding, polishing and the like caused by appearance molding is reduced.

Description

technical field [0001] The invention belongs to the technical field of railway freight car side frame casting, and in particular relates to an integral sand core used for integrally forming a guide frame of a railway freight car side frame and a mounting surface of a retaining key and a manufacturing method thereof. Background technique [0002] The side frame of a railway freight car is a key part of the running part of a railway freight car. In the production of side frame castings in my country, the guide frame is formed by sand cores, and the mounting surface of the retaining key is formed by external molding, such as figure 2 shown. [0003] Using the method of forming the mounting surface of the retaining key, the side frame produced mainly has the following hazards: [0004] First, when forming the mounting surface of the retaining key, the parting surface is in the middle of the mounting surface of the retaining key, and according to the process of 1 degree draft an...

AI Technical Summary

Problems solved by technology

[0004] First, when forming the mounting surface of the retaining key, the parting surface is in the middle of the mounting surface of the retaining key, and according to the process of 1 degree draft angle, it will produce such image 3 The draft angle 8 of 1 mm shown in , in order to make the surface flat and easy to fasten the bolts, it needs to increase the grinding workload

[0005] The second is that the appearance is divided into types on the mounting surface of the retaining key. When the box is combined, there is a phenomenon of wrong boxing between the upper and lower boxes. image 3 The step 9 shown in will directly affect the installation of the retaining key, and it still needs to be polished to make the installation surface smooth

[0006] The third is that the shape is divided on the mounting surface of the retaining key, and the upper and lower boxes are not tightly closed, and the gaps that are not tightly closed are formed during the casting filling and solidification forming image 3 The flash 10 shown in , this kind of flash needs to be cut and polished in the subsequent cleaning process, which increases the cleaning workload

[0007] The above hazards are reflected in the production process of railway accessories, which will bring certain economic losses to railway production enterprises.

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