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Method for quick repair welding, restoring and reproducing of high-alloy cold-working mould

A cold-work die and remanufacturing technology, applied in the field of high-alloy cold-work die steel, can solve problems such as high cost, chipping and wear of cold-work dies

Inactive Publication Date: 2010-06-16
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the failure of chipping, wear, dimensional deformation, cracking and other failures in cold working molds in manufacturing enterprises, the cost of preparing new molds to replace the failed molds is huge and the production cycle is long. Therefore, it is hoped that the simple and effective means of welding can be used to repair failures. mold
However, most cold working dies use high-alloy steel nowadays, and the high carbon equivalent limits the conventional wire welding method

Method used

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  • Method for quick repair welding, restoring and reproducing of high-alloy cold-working mould
  • Method for quick repair welding, restoring and reproducing of high-alloy cold-working mould

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: The aging mold repaired in this example is a Cr12MoV edge-trimming and cold-working mold that has been quenched at 1040°C and kept at 210°C for 2 hours and tempered twice. The mold has been repaired many times and used more than 200,000 times , There are two chipped corners and multiple cracks on the cutting edge and the size is deformed. The welding repair and remanufacturing technology of the present invention is used to carry out the following treatment.

[0022] The operation steps of the welding repair and remanufacturing technology adopted in this embodiment are as follows:

[0023] (a) Preheating temperature and holding time before welding repair: First, grind the edge chipping, crack and size collapse of the Cr12MoV mold into a smooth surfacing groove. There are a large number of hidden micro-cracks inside the severely aged Cr12MoV cold-work mold and the micro-cracks on the surface of the mold contain oil stains. Therefore, the preheating temperature...

Embodiment 2

[0029] Example 2: The forming mold repaired in this example is DC53 cold work die steel that has been tempered twice at 200°C for 2 hours after oil quenching at 1030°C. After multiple repairs, it has been used more than 100,000 times. Failures such as cracks, collapse and dimensional deformation. The welding repair and remanufacturing technology of the present invention is used to carry out the following treatment.

[0030] The operation steps of the welding repair and remanufacturing technology adopted in this embodiment are as follows:

[0031] (a) Preheating temperature and holding time before welding repair: Firstly, grind the cracks on the surface of the DC53 mold and the parts with insufficient size to form a smooth surfacing bevel. Choose a moderate preheating temperature of 350°C and keep it warm for 2 hours to protect the mold. Avoid accidental cracking during welding repair, clean the groove to be welded by evaporating oil stains, and improve the quality of the weld...

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Abstract

The invention relates to a process technology and a method aiming at the simple, convenient and effective repair welding, restoring and reproducing of a cold-working die, which belongs to the technical field of high-alloy cold-working die steel. In the method, hard-face knife edges or molding shape faces which satisfies the requirements are produced on a failed cold-working die through resurfacing welding mainly by the process steps of the preheating treatment of a die to be restored before repair welding, the adoption of a specific welding wire, the determination of welding high-frequency current, the postweld heat treatment and the like, so the failed die carries out the punching task of more than tens of thousands times again. The method solves the problems of high carbon equivalent and difficult welding of high-alloy steel, recycles the failed die of a producer after repair welding and restoration, can enhance the service life of the die, reduces the maintenance cost of the die and enhances the production efficiency.

Description

technical field [0001] The invention relates to a process technology and method for simple and effective welding repair and remanufacturing of cold-work molds, and belongs to the technical field of high-alloy cold-work mold steels. Background technique [0002] Due to the failure of chipping, wear, dimensional deformation, cracking and other failures in cold working molds in manufacturing enterprises, the cost of preparing new molds to replace failed molds is huge and the production cycle is long. Therefore, it is hoped that welding is a simple and effective means to repair failures. mold. However, most cold working dies use high-alloy steel nowadays, and the high carbon equivalent limits the conventional welding wire welding method. Therefore, it is necessary to develop special welding repair and remanufacturing technology to solve the maintenance problems of high-alloy cold-work die steel faced by enterprises, thereby reducing the maintenance cost of cold-work die and imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K9/16B23P6/00
Inventor 陶立民吴晓春邬天荣孙文娟马栋柱曹韵牧姚关霖
Owner SHANGHAI UNIV
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