Powder Conformal Volume Additive Method for Hot Forging Die Remanufacturing and Its Application

A hot forging die and remanufacturing technology, applied in the field of hot forging die repair and remanufacturing, to achieve the effect of ensuring bonding, grain refinement, and easy material composition and thickness

Active Publication Date: 2020-10-30
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, in order to solve the shortcomings of the existing hot forging die repair and remanufacturing technology, the purpose of the present invention is to propose a powder conformal volume additive method and its application for hot forging die remanufacturing

Method used

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  • Powder Conformal Volume Additive Method for Hot Forging Die Remanufacturing and Its Application
  • Powder Conformal Volume Additive Method for Hot Forging Die Remanufacturing and Its Application
  • Powder Conformal Volume Additive Method for Hot Forging Die Remanufacturing and Its Application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1 Remanufacturing of invalid crankshaft forging die with powder conformal volume additive

[0047] The specific process is as follows:

[0048] Step (a-1): Use a grinder to remove the scale and graphite emulsion in the cavity of the crankshaft forging model, and use carbon arc gouging to carefully clean the cavity area of ​​the failed forging model to remove all defective layers. The damaged parts to be cleaned include the fatigue layer, cracks, wear, deformation and other areas of the cavity. The cleaning depth is 10-30mm, and the protruding area of ​​the cavity is reduced or the concave area of ​​the cavity is increased. Use imaging agent and penetrant to carry out coloring flaw detection on the cleaned cavity surface to detect whether defects such as cracks are completely removed.

[0049] Step (b-1): According to the service performance requirements and material composition of the crankshaft forging die, the thickness of the bonding layer and the wear-resis...

Embodiment 2

[0056] Example 2 Remanufacturing of the failed connecting rod forging die with powder conformal volume additive

[0057] The specific process is as follows:

[0058] Step (a-1): Use a grinder to remove the oxide skin and graphite milk layer in the cavity of the forging model of the connecting rod, and use carbon arc gouging or a CNC machine tool to carefully clean the area of ​​the cavity of the failed forging model to remove all defective layers. The damaged parts to be cleaned include the fatigue layer, cracks, wear, deformation and other areas of the cavity, and the cleaning depth is 10-30mm. Use imaging agent and penetrant to carry out coloring flaw detection on the cleaned cavity surface to detect whether defects such as cracks are completely removed.

[0059] Step (b-1): According to the service performance requirements of the hot forging die of the connecting rod, the thickness of the bonding layer and the wear-resistant layer and the composition of the powder material...

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Abstract

The invention discloses a powder conformal volumetric additive manufacturing method for hot forging die remanufacturing, and application of the powder conformal volumetric additive manufacturing method. According to different cavity structures of forging dies, powder conformal volumetric additive layers evenly distributed along the surfaces of the cavities are designed; and the thicknesses and compositions of the corresponding additive layers can be designed according to the service performance requirements of the dies. Each additive layer is composed of two parts, wherein one part is a bonding layer contacting with the base body of the corresponding forging die, and the other part is a wear-resisting layer contacting with a forging piece. The forging die which has been subjected to powderadditive manufacturing and densification is sintered, and therefore, a bonding layer-wear-resisting layer-integrated conformal volumetric additive layer is formed. The method is high in repairing efficiency, free of welding fume and environmentally friendly; the conformal repairing layer can be formed on the surface of the cavity of the forging die; and multiple layers of materials are adopted toform a gradient structure, and therefore, the bonding performance of interlayer materials is guaranteed, the hardness and abrasion resistance of surface layer materials are met, and the service lifeof the repaired forging die is prolonged.

Description

technical field [0001] The invention relates to the technical field of repairing and remanufacturing of hot forging dies, in particular to a powder conformal volume addition method for remanufacturing of hot forging dies and its application. Background technique [0002] Hot forging die production has the advantages of low cost, good quality and high efficiency. It is a kind of process equipment widely used in modern industrial production, and it is also an important development direction in the field of metal processing. Hot forging dies are subjected to severe high temperature-alternating loads during their service, and their mold cavities are susceptible to failure due to wear, plastic deformation, and thermal fatigue cracks, resulting in a shorter service life for hot forging dies. If new dies are manufactured , which wastes time and increases costs. The use of remanufacturing technology to repair the failed forging die can not only improve the utilization rate of mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/06B22F3/10B22F3/02B22F5/00
CPCB22F3/02B22F3/1003B22F5/007B22F7/062B22F2007/068
Inventor 秦训鹏纪飞龙华林倪茂杨世明胡泽启
Owner WUHAN UNIV OF TECH
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