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A method to improve the surface hardness of metal 3D printing 18ni300 mold steel

A 3D printing and surface hardness technology, applied in the field of 3D printing, can solve the problems of uneven surface hardness, low toughness, poor corrosion resistance, etc., to achieve uniform surface hardness, improved part toughness, and uniform internal structure.

Active Publication Date: 2020-09-11
BEIJING E PLUS 3D TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] ①The hardness of 18Ni300 mold steel in metal 3D printing state is between 30-35HRC, and the hardness after aging heat treatment is between 48-54HRC, which cannot fully meet the needs of injection molds under complex working conditions
[0005] ② Parts with large size and uneven wall thickness are prone to uneven surface hardness after heat treatment
[0006] ③ Metal 3D printing mold parts have lower toughness and are easier to crack after aging heat treatment
18Ni300 mold steel has poor corrosion resistance and is easy to rust

Method used

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  • A method to improve the surface hardness of metal 3D printing 18ni300 mold steel
  • A method to improve the surface hardness of metal 3D printing 18ni300 mold steel

Examples

Experimental program
Comparison scheme
Effect test

specific example

[0051] Print 10 pieces of 30×30×10mm in the same batch 3 The 18Ni300 mold steel sample block was used for coating preparation experiments with different plasma spraying process parameters, and the hardness test was carried out after heat treatment. For each group of 2, the same plasma spraying process parameters were used for coating preparation experiments. In the actual experiment, two groups were taken The average value of is taken as the experimental result under this parameter. Experiments have proved that the pressure of argon gas is 0.3-0.6MPa, the flow rate is 50-70L / min, which can prevent the ablation and oxidation of the coating material; when the powder feeding rate is 60-90g / min, and the coating thickness is 0.5-0.9mm, it can significantly Improve the surface hardness of the mold.

[0052] The test results are shown in Table 1 below.

[0053] Table 1

[0054]

specific Embodiment

[0056] The powder is dried at 80°C for 3 hours; the preheating temperature of the parts is 120-150°C;

[0057]During the preparation process, argon protection is used, the argon pressure is 0.3-0.6MPa, and the flow rate is 50-70L / min; to prevent ablation and oxidation of the coating material; the powder feeding rate is 60-90g / min, and the distance between the spray gun and the workpiece is 150- 180mm; coating thickness is 0.5~0.9mm.

[0058] Heat treatment: Put the parts in a muffle furnace for stress relief heat treatment. The system is: 300°C / h with the furnace heating up to 500°C, holding for 1h, cooling with the furnace to 300°C and then taking it out for air cooling.

[0059] Machining: Remove 0.3-0.5mm of the coating on the surface of the part as machining allowance.

[0060] Compared with the prior art, the present invention has the following beneficial effects:

[0061] ① The present invention can make the surface hardness of the mold reach 56-65HRC, and the NiCrBSi ...

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Abstract

The invention provides a method for increasing the surface hardness of 18Ni300 die steel for metal 3D printing. The method comprises the following steps that S1, a die is printed; S2, solid-soluble heat treatment of a part is conducted; S3, wire cutting and powder clearing of the part are conducted; S4, parts surface treatment is conducted; S5, part surface coating preparation and coating are conducted; S6, heat treatment is conducted; and S7, machining is conducted, specifically, 0.3-0.5 mm of a part surface coating is removed as machining allowance. According to the method for increasing thesurface hardness of the 18Ni300 die steel for metal 3D printing, an NiCrBSi coating can be evenly applied to the surface of the die part through a plasma spraying process, the surface hardness is uniform, and the surface hardness of the die can reach 56-65 HRC.

Description

technical field [0001] The invention relates to the field of 3D printing, in particular to a method for improving the surface hardness of 18Ni300 mold steel for metal 3D printing. Background technique [0002] 18Ni300 is a special maraging steel for selective laser melting (SLM, hereinafter referred to as metal 3D printing). It has the characteristics of high strength, good welding performance, toughness and good cold and hot processing performance. , can process runners that cannot be processed by traditional manufacturing methods, improve the cooling efficiency of the mold and product quality, and maximize the production cycle, cost and efficiency. [0003] But now metal 3D printing molds have the following disadvantages: [0004] ①The hardness of 18Ni300 mold steel in metal 3D printing state is between 30-35HRC, and the hardness after aging heat treatment is between 48-54HRC, which cannot fully meet the needs of injection molds under complex working conditions. [0005]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/123C23C4/06C22C19/05C23C4/18C21D6/00
CPCC21D6/001C22C19/058C23C4/06C23C4/123C23C4/134C23C4/18
Inventor 郭东海冯涛吴朋越冯云龙齐帅包洪彬
Owner BEIJING E PLUS 3D TECH CO LTD
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