Preparation method for U-shaped hole in casting

Abstract

The invention relates to the casting field, and especially relates to a preparation method for a U-shaped hole in casting. Molding is carried out according to a designed casting structure. A U-shaped hole core is prepared from fibers with high temperature resistance and a metal skeleton, or painting for casting is painted uniformly on a metal skeleton to prepare a U-shaped hole core. The size of the U-shaped hole core is the same as the size of the shaped hole. The U-shaped hole core is placed in the mold during the pouring process. After the casting is taken out, the U-shaped hole core is drawn out, and a U-shaped hole meeting the curvature radius of design requirements can be obtained. The preparation method is advantageous in that, the problem that a U-shaped hole cannot be cast through a conventional casting method is solved.

Description

technical field [0001] The invention designs the field of casting, and in particular relates to a method for forming U-shaped holes with different curvatures on castings by using high-temperature-resistant fibers or coatings for casting. Background technique [0002] The formation of U-shaped holes is difficult to achieve either by ordinary cutting or traditional sand casting methods. Therefore, the formation of U-shaped holes on parts is generally divided into two categories: one is electron beam processing technology, which uses electron beams in the magnetic field The principle of medium deflection makes it deflect inside the workpiece, and can process fine U-shaped holes. By controlling the speed of the electron beam and the strength of the magnetic field, the radius of curvature can be controlled. However, the processing efficiency of this method is low, and the processing cost will be very expensive if a hole with a larger diameter is processed; the other is to use a ...

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Problems solved by technology

However, the processing efficiency of this method is low, and the processing cost will be very expensive if a hole with a larger diameter is processed; the other is to use a metal elbow (the metal elbow is the same material as the casting) as the U-shaped hole core, and then pass Casting U-shaped hole

However, this method must strictly control the metal pouring temperature. Once the pouring temperature is designed to be too high or improperly operated, the metal elbow may be melted through, causing the workpiece to be scrapped.

If the pouring temperature design is too low, it may cause poor bonding between the metal elbow and the metal matrix, which is also not conducive to the quality of the workpiece

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