Method for controlling isothermal precision formed forging flow line of complicated disk cake forging

A control method and precision forming technology, applied to vehicle parts, transportation and packaging, wheels, etc., can solve problems such as streamline outcropping, eddy current and through-flow, so as to prevent eddy current or through-flow defects, improve mechanical properties and anti-fatigue performance effect

Active Publication Date: 2010-06-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the mechanical properties and fatigue resistance of complex disc cake forgings in the specified direction and prevent stress corrosion, the streamlines of such forgings are mostly required to be distributed in the radial or circumferential direction, while the original blanks are mostly streamlines (forging streamlines) ) bars distributed along the axial direction, so such forgings are very prone to defects such as streamline outcropping, eddy current and flow-through

Method used

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  • Method for controlling isothermal precision formed forging flow line of complicated disk cake forging
  • Method for controlling isothermal precision formed forging flow line of complicated disk cake forging
  • Method for controlling isothermal precision formed forging flow line of complicated disk cake forging

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specific Embodiment approach 1

[0018] Specific implementation mode 1: As shown in Figures 1 to 5, the specific process of the forging streamline control method for the isothermal precision forming of complex disc cake forgings described in this implementation mode is as follows:

[0019] A. Upsetting billet making stage: select the original billet according to the geometric dimensions of the pre-designed complex disc cake forging, and change the streamline distributed along the axial direction of the original billet into the streamline distributed along the ring or radial direction ( The original blanks of complex disc cake forgings in isothermal precision forming generally choose bars whose streamlines are distributed along the axial direction):

[0020] The original blank (bar) used to form complex disc cake forgings is heated to a temperature above the recrystallization temperature of the material used and below the melting point, and after heat preservation, it is placed on a flat anvil mold heated to th...

specific Embodiment approach 2

[0030] Specific embodiment two: In step C of this embodiment, the way to increase the radial resistance is: for the forging with a hole in the center, no hole is opened in the center of the original billet or only a small hole with a diameter not greater than 20mm is opened, and the final forging die Center cored to increase the radial resistance at the bore. Prevent or greatly reduce the flow of metal along the radial direction to the center, and avoid the occurrence of flow-through defects. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0031] Specific embodiment three: In step C of this embodiment, the way to increase the radial resistance is to increase the width and height of the flash bridge when designing the pre-forging, which can increase the flow of metal to the flash in the radial direction. Resistance, reducing the radial flow velocity of the metal, thereby avoiding the generation of flow-through defects. Other components and connections are the same as those in the first embodiment.

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Abstract

The invention discloses a method for controlling an isothermal precision formed forging flow line of a complicated disk cake forging and relates to a method for controlling a flow line of a disk cake forging. The invention aims to lead the forging flow line of the complicated disk cake forging to be distributed along the radial direction or the annular direction to improve the mechanical performance and the fatigue resistance of the complicated disk cake forging in the appointed direction. The method comprises the following main steps of: upsetting blank preparing phase: converting a flow line of an original blank material, which is distributed along the axial direction, into a flow line which is distributed along the annular direction or the radial direction; preforging formation: preparing an obtained cake blank into a preforging, leading the metal allotting amount of all parts of the preforging to be equivalent to a final forging and leading shapes of the preforging and the final forging to be similar; and final forging formation: carrying out final forging formation by two methods of a reverse extrusion deforming way and a radial resistance increase way. The method overcomes the defects of exposure, vortex, cross flowing, and the like of the flow line, which are easy to generate during isothermal precision formation of the complicated disk cake forging, has reasonable flow line distribution and improves the mechanical performance and the fatigue resistance of the disk cake forging.

Description

technical field [0001] The invention relates to a streamline control method for pancake-like forgings, belonging to the technical field of precision forming. Background technique [0002] Pancake forgings are widely used in the aviation field. In recent years, in order to meet the needs of weight reduction, such parts are mostly designed as integral structural parts with complex shapes, and the requirements for the precision and structural properties of forgings are getting higher and higher. For some important stress components, forgings are also required Streamlines follow the geometry of the part. Complex pancake forgings refer to pancake forgings with thin webs, high ribs or long ears, etc., which are difficult to form. Such forgings are generally used in key parts with complex forces on aircraft, and are often non-axisymmetric. , The metal flow during forming is very complicated, so forming is very difficult. In order to improve the mechanical properties and fatigue ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/32B21J1/06B21J5/08B21J1/04B21J3/00
Inventor 单德彬徐福昌徐文臣袁林张艳秋
Owner HARBIN INST OF TECH
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