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A device and method for repairing cracks in hot work dies

A technology of hot-working mold and repair method, applied in the field of mold crack repair, can solve the problems of lack of wide applicability and environmental protection economy, reducing material crack propagation, and large gradient of structure change, so as to improve the efficiency of diffusion connection and crack repair. Lift, small size change effect

Active Publication Date: 2020-04-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned in the patent CN105252203A, 2016-01-20. The use of TIG repair welding method is aimed at repairing large cracks visible to the naked eye. The residual stress and oxide layer generated by welding need to be eliminated, and the parts need further machining; Patent CN104673974A, 2015-06-03. Mainly aimed at the preparation of raw materials, improving the toughness of hot-working molds by controlling tissue transformation, and reducing material crack growth; patent CN104962723A, 2015-10-07. With the help of microcapsule adhesives, Use laser shock strengthening to achieve surface structure densification and crack repair; patent CN104439887A, 2015-03-25. Use the tip discharge theory to repair cracks of a certain scale, but the effect is poor for large sizes and the gradient of the welded structure is large. At the same time, its design device For thin sheets only
These methods are likely to have additional effects on the hot work mold itself, and are more used for the treatment of surface cracks to improve the service life, which do not have wide applicability and environmental protection and economy

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  • A device and method for repairing cracks in hot work dies
  • A device and method for repairing cracks in hot work dies
  • A device and method for repairing cracks in hot work dies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1, as Figure 6 As shown, a method for repairing cracks in a hot-working die. In this embodiment, a hot-working die made of 2520 material for hot forming of a titanium alloy in service is taken as an example. The specific process is as follows:

[0045] (1) Preparation work:

[0046] Cleaning: Perform routine cleaning on the hot work mold 63 that has been in service for 60 working cycles, remove the sundries and lubricants on the surface of the hot work mold 63, then put the hot work mold 63 into the ultrasonic cleaning pool, add 1:1 water alcohol The solution is not overheated to make the mold 63, and ultrasonically cleaned for 30-40 minutes to remove the oil stains and powders in the surface adhesion and surface cracks of the hot-worked mold 63.

[0047] Measurement: simply measure the length, width and height of the hot-working mold 63 L*B*A=600mm*600mm*200mm; measure the center crack with a length of 20 μm through non-destructive testing, and the directi...

Embodiment 2

[0055] Embodiment 2, as Figure 6 As shown, a method for repairing cracks in a hot-working die. In this embodiment, a hot-working die made of 2520 material for hot forming of a titanium alloy in service is taken as an example. The specific process is as follows:

[0056] (1) Preparation work:

[0057] Cleaning: Perform routine cleaning on the hot work mold 63 that has been in service for 60 working cycles, remove the sundries and lubricants on the surface of the hot work mold 63, then put the hot work mold 63 into the ultrasonic cleaning pool, add 1:1 water alcohol The solution is not overheated to make the mold 63, and ultrasonically cleaned for 30-40 minutes to remove the oil stains and powders in the surface adhesion and surface cracks of the hot-worked mold 63.

[0058] Measurement: simply measure the length, width and height of the hot-working mold 63 L*B*A=600mm*600mm*200mm; measure the center crack with a length of 20 μm through non-destructive testing, and the directi...

Embodiment 3

[0066] Embodiment 3, as Figure 6 As shown, a method for repairing cracks in a hot-working die. In this embodiment, a hot-working die made of 2520 material for hot forming of a titanium alloy in service is taken as an example. The specific process is as follows:

[0067] (1) Preparation work:

[0068] Cleaning: Perform routine cleaning on the hot work mold 63 that has been in service for 60 working cycles, remove the sundries and lubricants on the surface of the hot work mold 63, then put the hot work mold 63 into the ultrasonic cleaning pool, add 1:1 water alcohol The solution is not overheated to make the mold 63, and ultrasonically cleaned for 30-40 minutes to remove the oil stains and powders in the surface adhesion and surface cracks of the hot-worked mold 63.

[0069] Measurement: simply measure the length, width and height of the hot-working mold 63 L*B*A=600mm*600mm*200mm; measure the center crack with a length of 20 μm through non-destructive testing, and the directi...

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Abstract

The invention relates to a hot working die crack repairing device and method and belongs to the field of die crack repairing. The device includes a high temperature diffusion system, a pulse current generation system and a die fixture tool. Crack gaps are reduced or even pressed through high temperature pressurization, and cracks are healed through tissue creeping and elemental diffusion. At the same time, auxiliary current can effectively detect generation expansion positions of the cracks, energy is controllably injected for healing microcracks, and an excellent crack repair quality and a high success rate can be obtained through appropriate vacuum diffusion process parameters. The repairing method can be used as a novel approach to repairing hot working die cracks and prolonging the service life of the device, and the device and method have high applicability, environmental protection and economic performance.

Description

technical field [0001] The invention belongs to the field of repairing mold cracks, and in particular relates to a repairing device and method for hot-working mold cracks. Background technique [0002] Hot work dies are subjected to cyclic loading and changes in cold and hot temperatures, resulting in thermal fatigue or thermomechanical fatigue, which leads to crack damage of hot work dies, which is the main failure mode. The service life of hot work dies is restricted by the initiation and expansion of cracks, and it is of great engineering and economic significance to repair cracks and prolong crack growth time. [0003] For hot work mold crack repair and life extension, the main methods in the past include heat treatment, surface treatment, crack repair welding and so on. As mentioned in the patent CN105252203A, 2016-01-20. The use of TIG repair welding method is aimed at repairing large cracks visible to the naked eye. The residual stress and oxide layer generated by we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P6/04
CPCB23P6/04
Inventor 陈明和苏楠谢兰生吴荣华叶建华
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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