Technical method for die steel surface nonmetallic ion infiltration

A process method and non-metallic technology, which is applied in the field of infiltration of non-metallic ions on the surface of die steel, can solve the problems of unstable gas nitriding performance, large carbonitriding deformation, and low heat treatment life, so as to improve service life and enhance durability. Abrasion resistance and anti-fatigue performance, easy operation effect

Inactive Publication Date: 2014-10-08
WEIHAI JIUWEI MATERIAL TECH CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned defects such as low service life of conventional quenching heat treatment, unstable gas nitriding performance, high energy consumption, large carbonitriding deformation, etc., and provide a mold with reasonable process design, low cost, environmental protection and easy operation The process of infiltrating non-metallic ions on the steel surface can enhance the wear resistance and fatigue resistance of the mold, improve the service life of the mold, and reduce production costs

Method used

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  • Technical method for die steel surface nonmetallic ion infiltration
  • Technical method for die steel surface nonmetallic ion infiltration
  • Technical method for die steel surface nonmetallic ion infiltration

Examples

Experimental program
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Embodiment 1

[0056] Embodiment 1: select H13 aviation pliers mold and the sample piece of the same material and technical state, the sample size is 15 * 15 * 7mm;

Embodiment 2

[0057] Embodiment 2: choose the sample piece of 5CrNiMo automobile connecting rod mold and the same material and technical state, and the sample piece specification is 15 * 15 * 7mm;

Embodiment 3

[0058] Embodiment 3: Select 3Cr2W8V open-ended wrench mold and sample piece of the same material and technical state, and the size of the sample piece is 15×15×7mm.

[0059] Above-mentioned three kinds of embodiments are carried out by the processing step among the present invention, concretely implement relevant parameter in the processing step scheme as following table:

[0060]

[0061] The implementation results are as follows:

[0062] 1. The surface penetration layer is uniform, such as figure 1 , image 3 , Figure 5 Shown by Fe 3 N, Fe 4 N, Fe 3 The average thickness of the dense compound layer composed of C is greater than 10 μm, and the average thickness of the diffusion layer formed by [N], [C], and [O] in the 100-fold microscopic metallographic diagram is greater than 100 μm.

[0063] 2. According to figure 2 , Figure 4 , Figure 6 As shown in the cross-sectional hardness gradient diagram of the middle seepage layer, the surface hardness of 40-60 μm i...

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Abstract

The invention relates to the technical field of metalsurface modification, and provides a technical method for die steel surface nonmetallic ion infiltration, and the technical method comprises the following process steps: A. cleaning a die surface for decontamination; B. preheating a die until the surface is golden yellow; C. infiltrating non metallic ions into the die, performing heat preservation on the die in nitride salt in a nitriding furnace for 4-5 hours; D. oxidizing the die, erforming heat preservation on the die in oxidizing salt in an oxidation furnace for 30-50 minutes; E. taking the die out from the oxidation furnace, naturally cooling to room temperature; F. putting the die into clear water for immersion for 30-50 minutes, then cleaning, and drying in air. The technical method has the advantages of reasonable technological steps, simple operation, short time, environmental friendliness, reliability, stripping resistance, no deformation and no sticking, and is economical and practical due to use of an ordinary external heated crucible furnace, the technical method is used for die steel surface N, C and O nonmetallic ioninfiltration to change tissue structure of the die material surface, realize wear resistance and anti fatigue performance reinforcement of die steel surface, and improve the service life of the die.

Description

technical field [0001] The invention relates to the technical field of metal surface modification, in particular to a process method for infiltrating non-metallic ions on the surface of die steel. Background technique [0002] As the basic process equipment of industrial production, mold is called "the mother of all industries". It is widely used in automobiles, aerospace, ships, petroleum, electromechanical, home appliances, tools and other fields. 60-80% of the parts are formed by molds. my country is the largest industrial manufacturing country in the world, and the consumption of molds is very large. According to incomplete statistics, it is about 2 million tons per year. More than 95% of the failure modes of the mold are caused by wear and fatigue damage, and there are two main technical factors that determine the quality and life of the mold. One is wear resistance and the other is fatigue resistance. Therefore, improving the wear resistance and fatigue resistance of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/38
Inventor 郑渝江朱春财罗德福李信
Owner WEIHAI JIUWEI MATERIAL TECH CO LTD
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