Saddle-shaped broaching core bar and broaching method thereof

Abstract

The invention relates to a saddle-shaped broaching core bar and a broaching method thereof. The cross section of the core bar is in a saddle shape. According to the saddle-shaped core bar, the core bar is machined to be in the saddle shape, on the basis that the diameter of the core bar is not increased, the practical contact face between an inner hole of a ring forged piece and the core bar is enlarged in the trestle broaching process of the ring forged piece, the inner hole is not folded in the broaching process, and the quality of the inner hole is improved; the reduction of each time is increased, the center of the forged piece is completely and thoroughly forged, and the final mechanical performance of the ring forged piece is improved; only one core bar needs to be used, and the production cost is reduced; and in addition, the contact area is enlarged, the work efficiency is improved, and the heating number can be reduced for special alloys.

Description

technical field [0001] The invention relates to saddle reaming, in particular to a saddle-shaped reaming mandrel and a method for reaming. Background technique [0002] In the forging process, it is often necessary to carry out horse-frame reaming, so that the outer diameter and inner hole of the ring forging are increased, and the wall thickness is thinned. In the process of horse-frame reaming, it is necessary to use a mandrel, and the diameter of the mandrel must be smaller than that of the forging The size of the inner hole can only be put into the ring forging, but as the size of the ring forging increases, the diameter of the mandrel will become smaller and smaller than the inner diameter of the ring forging, resulting in the contact surface between the inner hole of the ring forging and the mandrel becoming smaller and smaller. Small, when the ring forging is processed, it is necessary to use a small-diameter mandrel to ream the hole. After the outer diameter and inne...

AI Technical Summary

Problems solved by technology

[0002] In the forging process, it is often necessary to carry out horse-frame reaming, so that the outer diameter and inner hole of the ring forging are increased, and the wall thickness is thinned. In the process of horse-frame reaming, it is necessary to use a mandrel, and the diameter of the mandrel must be smaller than that of the forging The size of the inner hole can only be put into the ring forging, but as the size of the ring forging increases, the diameter of the mandrel will become smaller and smaller than the inner diameter of the ring forging, resulting in the contact surface between the inner hole of the ring forging and the mandrel becoming smaller and smaller. Small, when the ring forging is processed, it is necessary to use a small-diameter mandrel to ream the hole. After the outer diameter and inner hole of the ring forging increase to a certain size, replace the large-diameter mandrel and continue to ream the hole to the predetermined size; During the reaming process of the horse frame, 1. It is easy to cause plum blossom-shaped indentations and folds in the inner hole; 2. Two sets of tooling are required, which increases production costs and reduces work efficiency. For special alloys, it will also increase the number of fires. Cracks are prone to appear in the inner hole; 3. In the process of horse frame reaming, the single reduction amount is small, and the center of the forging cannot be completely forged, which reduces the final microstructure and properties of the ring forging

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