Preforming method for precision forging blades

Abstract

Provided is a preforming method for precision forging blades. A precision forging die is utilized and comprises a punch head, a left insert and a right insert, and a bar stock is arranged in the die. A forging piece deforms twice in the extrusion die, through a unique horn-opening-shaped design, materials are gathered at the position of a boss, and the die is mounted on a 160-ton crank press which has an ejector function and can eject the left insert and the right insert from a die seat so that the forging piece can be taken out conveniently. A kerosene blast burner is utilized to heat the die to a temperature between 180 DEG C and 300 DEG C, the bar stock is made of alloy GH4169 and heated to 1,020 DEG C, and the heating parameter is 1 minute per millimeter. In the process of forging, a water-based graphite lubricant is used for lubricating a cavity of the die, and the time from the bar stock is taken out of a furnace to extrusion forming of the bar stock is controlled to be within seven seconds. The preforming method for the precision forging blades has the advantages that the problem that the precision forging blades are pulled to cause damage and scrapped when final forging is carried out to the extrusion piece is solved completely, 10% of materials are saved compared to a traditional extrusion piece, and at the same time, through the preforming method for the precision forging blades, requirements of striking force on equipment when the final forging is carried out to the forging piece are reduced.

Description

[0001] technical field [0002] The invention relates to the technical field of forging, and in particular provides a method for preforming precision forging blades. Background technique [0003] When traditionally designing preforms for precision forged rotor blade extrusions, the shape of the extruded rods is designed according to the maximum transverse cross-sectional area of ​​the airfoil and the deformation required for final forging, and the bar is extruded once in the extrusion die. forming. In this way, there is too much metal in the local position of the blade body during final forging, and the deformation is large, resulting in strain, severe tearing, and the precision forged blade is scrapped. The strain can be avoided by grinding the extruded parts. At the same time, the material Too much impact on the equipment also increases the requirements, which can only be avoided by grinding to remove excess metal during production. Contents of the invention [0004] T...

AI Technical Summary

Problems solved by technology

In this way, there is too much metal in the local position of the blade body during the final forging, the deformation is large, resulting in strain, serious tearing, and the precision forged blade is scrapped. The strain can be avoided by grinding the extruded parts. At the same time, the material Too much impact on the equipment also increases the requirements, which can only be avoided by grinding to remove excess metal during production.

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