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Method for complexly treating 5CrMnMo hot work die steel

A technology of hot work die steel and compound treatment, which is applied in the direction of manufacturing tools, electron beam welding equipment, welding equipment, etc., can solve the problems of easy crater pits, molds that cannot continue to serve, high surface roughness, etc., and achieve Effects of reducing crater pitting, rapid hardening and polishing, and improving surface hardness

Active Publication Date: 2018-01-23
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] 5CrMnMo hot work die steel is mainly used to manufacture various small and medium-sized hot forging dies. In the process of hot work die processing blanks, it is affected by cold and heat fatigue, which easily leads to the initiation and expansion of cracks inside the material, while precision forging dies have higher requirements. Surface roughness, once the crack spreads to the surface and causes damage, the mold will not be able to continue to serve and cause losses
However, when the electron beam is on the surface of the surface modification material, due to the concentrated release of high energy of the electron beam, the phenomenon of crater pits is easy to appear. The method of die steel has broad market promotion value

Method used

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  • Method for complexly treating 5CrMnMo hot work die steel
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  • Method for complexly treating 5CrMnMo hot work die steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Preliminary preparation

[0033] Preparation of the accelerator: in parts by weight, put 100 parts of nickel-molybdenum tailings powder after desulfurization, 0.5 parts of phosphotungstic heteropolyacid catalyst, and 250 parts of strong acid solution into the reactor, at a temperature of 45 ° C, stirring Stir at a speed of 30r / min for 30min, let stand for 6h, filter, wash the sediment, put it into ammonia water with a mass fraction of 5% for 10h, and wash the leaching residue to obtain the ammonium molybdate accelerator .

[0034] The substance prepared earlier is used in the following method for composite treatment of 5CrMnMo hot work die steel.

[0035] 2. A method for composite processing 5CrMnMo hot work die steel, comprising the following steps:

[0036] (1) Milling treatment: Cut the 5CrMnMo hot work die steel workpiece into 40mm × 40mm × 40mm test blocks with a CNC milling machine. During the milling process, the feed rate and milling speed of each workpiece...

Embodiment 2

[0041] 1. Preliminary preparation

[0042] Preparation of the accelerator: put 100 parts of nickel-molybdenum tailings powder after desulfurization, 0.5 parts of phosphotungstic heteropolyacid catalyst, and 280 parts of strong acid solution into the reactor in parts by weight. Stir at a speed of 35r / min for 33min, let stand for 9h, filter, wash the sediment, put it into ammonia water with a mass fraction of 6% for 11h, and wash the leaching residue to obtain the ammonium molybdate accelerator .

[0043] The substance prepared earlier is used in the following method for composite treatment of 5CrMnMo hot work die steel.

[0044] 2. A method for composite processing 5CrMnMo hot work die steel, comprising the following steps:

[0045] (1) Milling treatment: Cut the 5CrMnMo hot work die steel workpiece into 40mm × 40mm × 40mm test blocks with a CNC milling machine. During the milling process, the feed rate and milling speed of each workpiece are kept the same, and the surface ro...

Embodiment 3

[0050] 1. Preliminary preparation

[0051] Preparation of the accelerator: put 100 parts of nickel-molybdenum tailings powder after desulfurization, 0.5 parts of phosphotungstic heteropolyacid catalyst, and 275 parts of strong acid solution into the reactor in parts by weight. Stir at a speed of 40r / min for 37min, let stand for 8h, filter, wash the sediment, put it into ammonia water with a mass fraction of 8% for 13h, and wash the leaching residue to obtain the ammonium molybdate accelerator .

[0052] The substance prepared earlier is used in the following method for composite treatment of 5CrMnMo hot work die steel.

[0053] 2. A method for composite processing 5CrMnMo hot work die steel, comprising the following steps:

[0054] (1) Milling treatment: Cut the 5CrMnMo hot work die steel workpiece into 40mm × 40mm × 40mm test blocks with a CNC milling machine. During the milling process, the feed rate and milling speed of each workpiece are kept the same, and the surface ro...

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Abstract

The invention discloses a method for complexly treating 5CrMnMo hot work die steel. The method comprises the following steps of (1) pretreating: cleaning a milled workpiece through an alcohol ether solvent, then spraying an accelerant at an outer surface of the cleaned workpiece, and obtaining a pretreated workpiece; (2) warming: placing the pretreated workpiece into a drying oven, enabling the temperature of the pretreated workpiece to reach 65 to 78 DEG C, and obtaining a warmed workpiece; and (3) treating with an electronic beam. According to the process adopted by the invention, not only can the hardness of the 5CrMnMo hot work die steel be improved, but also the surface roughness of the 5CrMnMo hot work die steel is reduced, the occurrence of a pit phenomenon of a volcanic vent is reduced, and the method has wide market promotion value.

Description

【Technical field】 [0001] The invention belongs to the technical field of high-energy beam surface modification of hot work die steel, in particular to a method for composite treatment of 5CrMnMo hot work die steel. 【Background technique】 [0002] 5CrMnMo hot work die steel is mainly used to manufacture various small and medium-sized hot forging dies. In the process of hot work die processing blanks, it is affected by cold and heat fatigue, which easily leads to the initiation and expansion of cracks inside the material, while precision forging dies have higher requirements. Surface roughness, once the crack spreads to the surface and causes damage, the mold will not be able to continue to serve and cause losses. Therefore, hot work molds require high surface hardness, low surface roughness and certain toughness. When the traditional quenching heat treatment process treats 5CrMnMo hot work die steel, in order to prevent "cracking", it is usually tempered quickly after oil qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/09C21D1/773C21D1/70C21D6/00B23K15/06
Inventor 魏德强王晓冰王荣崔弘阳
Owner GUILIN UNIV OF ELECTRONIC TECH
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