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Nitriding treatment method for aluminum profile extrusion die

A technology of extrusion die and nitriding treatment, applied in metal material coating process, coating, solid-state diffusion coating, etc. The effect of nitriding layer spalling

Inactive Publication Date: 2020-12-29
HUBEI SHANGDA MODEL MATERIAL TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology avoids the formation of white bright layer, it reduces the hardness of the infiltrated layer, thereby reducing the wear resistance

Method used

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  • Nitriding treatment method for aluminum profile extrusion die

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Carry out nitriding treatment in Φ2.2×4.5m gas nitriding furnace for 8 Φ280mm molds with steel grade H13 that have been processed to finished products. Heat at 520°C for 15 hours, control the ammonia decomposition rate in the furnace to 20%, then continue heating to 540°C for 8 hours, control the ammonia decomposition rate in the furnace to 45%, stop passing ammonia gas after 8 hours at 540°C, Add 50g of rare earth La blocks into the furnace, pass argon into the furnace, lower the furnace temperature to 460°C and keep it for 3 hours, then cool it down to 200°C at a rate of 50°C / h before taking it out of the furnace.

Embodiment 2

[0014] Carry out nitriding treatment on 6 Φ320mm molds with steel grade H13 that have been processed to finished products in a Φ2.2×4.5m gas nitriding furnace. Keep warm at 500°C for 20 hours, control the ammonia decomposition rate in the furnace to 30%, then continue heating to 550°C for 5 hours, control the ammonia decomposition rate in the furnace to 50%, stop passing ammonia after 5 hours at 550°C, Add 50g of rare earth La blocks into the furnace, pass argon gas into the furnace, lower the furnace temperature to 480°C and keep it for 2 hours, then cool it down to 200°C at a rate of 50°C / h before taking it out of the furnace.

Embodiment 3

[0016] Nitriding treatment was carried out on 5 Φ460mm finished molds with steel grade H13 in a Φ2.2×4.5m gas nitriding furnace. Before heating up, pass ammonia to exhaust and heat at a heating rate of 50°C / h. Keep warm at 510°C for 18 hours, control the ammonia decomposition rate in the furnace to 25%, then continue heating to 530°C for 10 hours, control the ammonia decomposition rate in the furnace to 40%, stop the ammonia gas after 10 hours at 530°C, Add 50g of rare earth La blocks into the furnace, pass argon gas into the furnace, lower the furnace temperature to 460°C and keep it for 4 hours, then cool it down to 200°C at a rate of 50°C / h before taking it out of the furnace.

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Abstract

The invention discloses a nitriding treatment method for an aluminum profile extrusion die. According to the nitriding treatment method, a three-stage nitriding technology is adopted, in the first stage of nitriding, heating is performed to 500-520 DEG C, heat preservation is performed for 15-20 hours, and the ammonia gas decomposition rate is 20-30%; in the second stage of nitriding, heating is conducted to 530-550 DEG C, heat preservation is performed for 5-10 hours, and the ammonia decomposition rate ranges from 40% to 50%; and in the third stage of nitriding, a rare earth catalyst is addedinto a furnace, ammonia gas is stopped introducing into the furnace, argon is introduced, the temperature in the furnace is reduced to 460-480 DEG C, heat preservation is performed for 2-4 hours, then the temperature is reduced to 200 DEG C, and the die is discharged from the furnace. According to the nitriding treatment method, the defect that a nitriding layer of the aluminum alloy profile extrusion die is prone to stripping is overcome, the three-stage nitriding technology is adopted, a nitriding layer structure in smooth transition between a compound layer and a transition layer without avein-shaped structure is obtained, a nitriding layer structure without a compound is obtained in the first stage of nitriding, and a nitriding structure of the compound layer is obtained in the second stage of nitriding, and in the third stage of nitriding, the hardness difference between a white bright layer and the transition layer is reduced, the binding force between the white bright layer and the transition layer is improved, and nitriding layer stripping caused in the die extrusion process is avoided.

Description

technical field [0001] The invention relates to mold products in the metallurgical industry, in particular to a nitriding treatment method for extrusion molds of aluminum profiles. Background technique [0002] The forming process of aluminum alloy profiles adopts die extrusion forming. Aluminum profile extrusion is to apply external force to the aluminum alloy billet placed in the extrusion cylinder to make it flow out from a specific die hole to obtain the required cross-sectional shape and size. A plastic processing method. When extruding aluminum alloy products, the mold must bear the effects of long-term high temperature and high pressure, repeated cycle stress of heating and cooling, eccentric load and impact load, and friction under high temperature and high pressure. Therefore, the aluminum alloy profile hot extrusion die requires good high temperature strength and high temperature toughness, and H13 steel is the first choice for die selection. Medium-alloy chromiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/24
CPCC23C8/24
Inventor 李民华
Owner HUBEI SHANGDA MODEL MATERIAL TECH
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